Tap

Abstract

To provide a tap in which a coolant is supplied to all tap grooves and chips are discharged to the outside of a prepared hole in any screw forming operation of the prepared hole of a blind hole form and a through hole form.SOLUTION: Since a groove cross-sectional area of a first coolant feed groove 10a for feeding a coolant to a first tap groove 9a (which functions as a chip discharge groove at the time of blind hole formation) is a groove cross-sectional area smaller than the groove cross-sectional area of the coolant feed groove for feeding the coolant to a second tap groove 9b to a fourth tap groove 9d which are chip entry blocking grooves, the coolant fed to the second tap groove 9b to the fourth tap groove 9d flows into a first tap groove 9a together with the chips, moves, and is discharged to the outside from a prepared hole opening at the time of blind hole formation, and the coolant in the first coolant feed groove 10a reaches a tip of the first tap groove 9a to cool the tip at the time of through hole formation.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tap having a characteristic coolant (cutting oil) supply form. [Background technology]

[0002] Conventionally, taps have been known that have a coolant supply groove (peripheral groove) that flows coolant from the rear end of the shank toward the tap groove around the outer periphery of the shank as a form of supplying coolant to the tap groove of the threaded portion (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-125857 A Summary of the Invention [Problem to be solved by the invention]

[0004] <Through hole cutting tap> The technology of Patent Document 1 mentioned above discloses a technology in which, when the pilot hole for forming a thread with a cutting tap is a through hole, coolant supply grooves (side-through grooves 16 in Patent Document 1) for supplying coolant to each of the tap grooves are provided on the outer periphery of the shank corresponding to each of the tap grooves (the number of tap grooves is the same as the number of coolant supply grooves) (for example, the tap in Figure 2 of Patent Document 1 (a configuration in which four coolant supply grooves are provided for each of the four tap grooves)).

[0005] The feature of this tool is that the four coolant supply grooves have the same groove depth and width, and the coolant is sprayed to the center (from the center) of each tap groove at the same amount and speed. By supplying coolant to all tap flutes (four tap flutes are shown here), the cutting chips cut into each of the four tap flutes by the cutting action of the four thread cutting edges (all cutting edges) are The coolant injected into the tap groove prevents the chips from remaining in the tap groove, thereby preventing the chips from having time to bite into the threads. It is forcibly pushed out downwards into the pilot hole, All cutting edges of the cutting edge are cooled by coolant, reducing cutting resistance and friction.

[0006] <Cutting tap for blind holes> The technology of Patent Document 1 mentioned above discloses a configuration in which, when the pilot hole for forming a screw with a cutting tap is a blind hole, coolant is not supplied to some of the tap grooves, and no coolant supply grooves are provided from the tap grooves to which coolant is not supplied to the rear end of the shank (for example, the tap in Figure 4 of Patent Document 1 (where two of the four tap grooves have two coolant supply grooves each, and coolant is not supplied to the other two tap grooves)).

[0007] When cutting a pilot hole (blind hole), coolant is sprayed into two tap grooves, and the coolant and cutting chips from the coolant-supply tap groove (the tap groove to which coolant is supplied) flow into the space between the pilot hole and the tip of the tap, and then flow into the non-coolant-supply tap groove (the tap groove to which coolant is not supplied).Then, together with the cutting chips generated by the cutting edge on the non-coolant-supply tap groove side, they rise up the non-coolant-supply tap groove and are discharged out of the pilot hole.

[0008] <Problems with through-hole cutting taps> As described above, when a hole cutting tap is used to cut a blind hole, coolant is sprayed into all tap grooves at the same flow rate, flow rate, groove width, and groove depth. This means that the opening of the coolant and chip discharge groove formed by the tapped pilot hole and tap groove becomes covered by the coolant, making it difficult for the coolant and chips to be discharged from the tap groove (they remain in the tap groove), causing the chips to get caught in the threaded portion, and causing poor cooling and increased frictional resistance due to a significant deterioration in the coolant flow. This has the disadvantage of causing problems such as this.

[0009] <Problems with cutting taps for blind holes> When the above-mentioned cutting tap for blind holes is used to cut a through hole (form a thread), coolant is sprayed into the two coolant supply tap grooves, but the coolant flows out directly below the pilot hole and is released (discharged) from the lower opening of the pilot hole together with the cutting chips in the coolant supply tap groove. However, no coolant is supplied to the other two non-coolant supply tap grooves, which has the disadvantage that it is not possible to effectively cool the cutting edge on the non-coolant supply tap groove side, reduce frictional resistance, or quickly discharge cutting chips.

[0010] Therefore, the cutting tap of the invention of Patent Document 1 has the following problems. (A) Through hole taps are difficult to use for threading blind holes, and blind hole taps are difficult to use for threading through holes. (a) In a thread forming environment where blind hole thread forming and through hole thread forming are mixed, two types of taps, a through hole cutting tap and a blind hole cutting tap, must be prepared, and two cutting devices must be used or one cutting device must be used and switched between them to form the threads. (c) Since through hole cutting taps and blind hole cutting taps have the same configuration except for the coolant supply groove, there was a possibility of incorrectly attaching the type of tap used.

[0011] The coolant is supplied by jetting to the center of the tap groove. However, the state of wind pressure (air flow) generated within the tap groove outside the pilot hole (within the tap groove that has not yet entered the pilot hole) by the rotating tap action for cutting is a cutting edge surface wind pressure hit state, facing the cutting edge side and hitting the rake face, which is the rising surface on the cutting edge side. Therefore, the coolant in the tap groove that is not in the pilot hole is pushed out of the tap groove together with the wind when it hits the cutting edge, which reduces the amount of coolant supplied to the cutting edge during cutting. If the pilot hole is a blind hole, this means that the amount of coolant that discharges the chips is reduced, which may result in a situation where the chips cannot be discharged sufficiently.

[0012] In the invention of Patent Document 1, the bottom of the coolant supply groove (side-through groove 16 in Patent Document 1) is configured so as not to reach the bottom of tap groove 15, but it is appropriate that the groove bottom be formed so as to have the same groove depth as the bottom of tap groove 15 even at its deepest, and therefore the groove termination portion of the coolant supply groove is located far away from the tip of the tap (the chamfer) (in Figure 1, the rearmost position of the threaded portion). However, the coolant flowing through the coolant supply groove is released and spreads into the wide tap groove at the groove end portion, resulting in a state of scattering, and the speed of the scattering decreases significantly, resulting in a state of low scattering speed. This state of reduced dispersion has the disadvantage that, particularly during the cutting progress for a while after the start of cutting the pilot hole (when thread formation begins), the area between the bit during cutting and the groove end of the coolant supply groove is an open space where the tap groove does not enter the pilot hole, so much of the coolant that has reduced dispersion at the groove end is dispersed into the open space, resulting in a small amount of coolant being supplied to the bit during cutting and a weak supply force. Therefore, for a while after cutting begins (when thread formation begins) and cutting progresses, there is a high possibility that the chip discharge force, which is the coolant flow rate and coolant momentum that is sufficient to push the chips down the tap flute (in the direction of thread formation of the tap) (push the tap tip out), will be insufficient, and during this insufficient chip discharge force, chips will remain in the tap flute and become caught, creating the disadvantage that there is a risk of the tap flute becoming clogged due to the formation of chip lumps.

[0013] In view of the above-mentioned drawbacks of the prior art, the present invention provides a tap having a coolant supply groove connected to the tap groove, which supplies coolant to the tap groove, (1) The objective is to provide a tap (including a cutting tap and a rolling tap) in which coolant is supplied to all tap flutes (including flutes of a rolling tap) during the thread forming operation of either a blind hole type or a through hole type pilot hole, and any chips generated are discharged outside the pilot hole. (2) Another object of the present invention is to provide a tap (including a cutting tap and a rolling tap) that can supply a larger amount of coolant to the chamfer side that forms the thread. (3) Another object of the present invention is to provide taps (including cutting taps and rolling taps) with high torsional strength. (4) Another object of the present invention is to provide a tap (including a cutting tap and a rolling tap) that ensures the amount of coolant supplied to the cutting portion or the impact force from the start of thread formation of the pilot hole. [Means for solving the problem]

[0014] In order to achieve the above object, the present invention has the following configuration. [Invention 1] A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, In the case where the pilot hole for forming the female thread is a blind hole, A part of the tap groove functions as a chip intrusion prevention groove, the chip entry prevention groove is configured to function as a groove that releases chips into a pilot hole space, which is a space of the pilot hole expanding forward of the threaded portion, depending on the amount and / or force of the coolant supplied, and does not allow the chips to enter the groove, The tap grooves other than the chip entry prevention grooves function as chip discharge grooves that move within the grooves so that the coolant containing the chips discharged from the chip entry prevention grooves into the pilot hole space is discharged to the outside from a pilot hole opening that is an opening of the pilot hole, a chip discharge groove connecting coolant supply groove, which is a coolant supply groove that supplies coolant to the chip discharge groove among the coolant supply grooves, has a coolant supply form that cannot prevent coolant containing chips from entering the chip discharge groove and being discharged to the outside through the pilot hole opening, In the case where the pilot hole is a through hole, The coolant supplied from the chip discharge groove connecting coolant supply groove flows through the chip discharge groove, reaches the tip side of the threaded portion, and cools the tip side (excluding an embodiment in which a through coolant supply hole is provided in the form of a through hole from the rear end side of the shank to the tip side of the threaded portion, for supplying coolant from the rear end side of the shank and discharging it from the tip side of the threaded portion). [Invention 2] A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, a groove form in which all or a part of the coolant supply groove extends to a position approximately 1 / 3 or more of the tap groove in the range of the complete thread portion and has a groove end point (82), or a groove form in which the groove extends through the tap groove but does not have the groove end point (82). [Invention 3] A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, The tap groove form includes a shallow tap groove portion that is a shallow groove form extending from the shank side toward the tip of the tap, and a deep tap groove portion that is a groove form deeper than the shallow tap groove portion and that is located on the tap tip side of the shallow tap groove portion and extends toward the tip of the tap, A tap characterized in that the shallow tap flute portion has a length extending to a position that is approximately 1 / 3 or more of the tap flute in the range of the fully threaded portion. [Invention 4] The tap according to claim 3, wherein the shallow tap groove portion has the coolant supply groove formed in a penetrating form. [Invention 5] A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, a raised portion is provided over all or part of the axial direction of the tap groove, the raised portion extending from a bottom of the tap groove to the shank portion and extending toward the tap tip side in a form that fits within the range of the complete thread portion. [Invention 6] The tap according to the above-mentioned invention 5, wherein the raised portion is in a form in which the coolant supply groove is formed. [Invention 7] A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, In the whole or part of the tap groove, a partition wall is provided at a height that does not contact the female thread formed in the pilot hole, and is connected to the shank portion and formed in a form that fits within the range of the complete thread portion toward the tap tip side. The tap is characterized in that the tap groove 9d is divided into two grooves by the partition wall, thereby forming a back surface groove and a cutting surface groove. [Invention 8] The tap according to the invention 7, characterized in that the coolant supply groove is connected to the back surface groove or the cutting surface groove. [Invention 9] A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, In the case where the pilot hole for forming the female thread is a blind hole, A part of the tap groove functions as a chip intrusion prevention groove, the chip entry prevention groove is connected to the coolant supply groove and functions as a groove that releases chips into a pilot hole space, which is a space of the pilot hole expanding forward of the threaded portion, depending on the amount and / or force of the coolant supplied, and does not allow the chips to enter the chip entry prevention groove; The tap grooves other than the chip entry prevention grooves function as chip discharge grooves that move within the grooves so that coolant containing chips discharged from the chip entry prevention grooves into the pilot hole space is discharged to the outside from a pilot hole opening that is an opening of the pilot hole, The tap is characterized in that the groove width of the chip entry prevention groove is narrower than the groove width of the chip discharge groove. [Invention 10] The tap according to invention 9, characterized in that in the chip entry prevention groove, the groove form of the coolant supply groove communicating with the chip entry prevention groove is a non-through groove form in which the groove extends to a position approximately 1 / 3 or more of the tap groove in the range of the complete thread portion and has a groove end point (82), or a through groove form in which the groove does not have the groove end point (82) and passes through the tap groove. [Invention 11] The groove form of the chip intrusion prevention groove has a shallow tap groove portion which is a shallow groove form extending from the shank side toward the tip of the tap, and a deep tap groove portion which is a groove form deeper than the shallow tap groove portion and is located on the tap tip side than the shallow tap groove portion, The tap according to claim 9, characterized in that the coolant supply groove connected to the chip entry prevention groove has a shallow groove penetrating form that penetrates the shallow tap groove portion and is configured to release coolant to the deep tap groove portion. Effect of the Invention

[0015] [Effects of Invention 1] In the case where the pilot hole forming the female thread is a blind hole, the chip entry prevention groove realizes a form in which chips do not enter the chip entry prevention groove by the coolant supplied thereto, and the chip discharge groove is a coolant supply groove that supplies coolant to the chip discharge groove, and the chip discharge groove connecting coolant supply groove has a coolant supply form in which the coolant containing chips cannot be prevented from entering the chip discharge groove and being discharged to the outside from the pilot hole opening, and therefore realizes a form in which the coolant containing chips released from the chip entry prevention groove into the pilot hole space moves within the groove so as to be discharged to the outside from the pilot hole opening, which is the opening of the pilot hole, In the case where the pilot hole is a through hole, the coolant supplied from the chip discharge groove communication coolant supply groove flows through the chip discharge groove, reaches the tip side of the threaded portion, and cools the tip side. Therefore, whether the thread is formed in a blind hole or a through hole, this has the advantageous effect of realizing a tap that allows coolant to reach and cool all of the tap grooves and all of the cutting edges of the chamfer at their tips. Since only one type of tap can be used, which is a tap for both pilot holes, there is no need to manage taps for blind holes and taps for through holes separately, and mistakes such as using a through hole tap for a blind hole can be prevented, thereby simplifying the management of taps. [Effects of Invention 2] In tap grooves in which the coolant supply groove extends to a position approximately 1 / 3 or more of the tap groove in the range of the complete thread portion and has a groove end point (82), or in which the coolant supply groove is a through groove that does not have a groove end point (82) that penetrates the tap groove, the coolant reaches a position approximately 1 / 3 or more of the tap groove in the range of the complete thread portion (a position closer to the chamfer) and splashes at the groove end point (82), thereby realizing a configuration in which more coolant reaches the tip side of the tap groove (the chamfer). Alternatively, in a through groove configuration in which the coolant supply groove extends to and penetrates the tip of the tap groove, a configuration in which more coolant reaches the tip side of the tap groove (the chamfer) is realized. [Effects of Invention 3] Providing a shallow portion in the tap groove increases the wall thickness accordingly, which has the effect of increasing the torsional strength of the tap and realizing a durable tap that is less likely to break. [Effects of Invention 4] In addition to providing the same effect as the third invention, the coolant supply groove is formed in a penetrating manner in the shallow portion, and it is possible to make the groove depth of the coolant supply groove portion formed in the shallow portion a deep groove. This provides the effect of realizing a form in which more coolant is released with force to the deep tap groove portion, thereby realizing a form in which more coolant reaches the tip side (chasing portion) of the tap groove with force. [Effects of Invention 5] Since this tap groove has a raised portion that is connected to the shank portion in a raised form from the bottom of the groove and is formed in a form that fits within the range of the complete thread portion toward the tap tip side, the thickness of the raised portion has the effect of increasing the torsional strength. [Effects of Invention 6] The same effect as that of the fifth aspect is achieved, and since the coolant supply groove is formed in the raised portion, a larger amount of coolant can be forcefully delivered to the tap center side. [Effects of Invention 7] In a tap having a coolant supply groove, a partition wall is provided that is connected to the shank portion and is formed toward the tap tip side so as to be within the range of the complete thread portion, and a back surface groove and a cutting surface groove are formed by this partition wall, so that the coolant supply groove can be connected to the back surface groove or the cutting surface groove, and since the back surface groove or the cutting surface groove has a narrow groove form, it is possible to reduce the scattering of coolant released from the coolant supply groove and increase the amount of coolant that reaches the tap tip, and also achieve the effect of increasing the torsional strength by the partition wall. [Effects of Invention 8] It has the same effect as the seventh invention. [Effects of Invention 9] In addition to achieving the same effects as those of Invention 1 above, the groove width of the chip entry prevention groove is narrower than the groove width of the chip discharge groove, so that chip curling can be reduced and chip folding is accelerated, promoting the formation of short chips. Furthermore, the amount of splashing and weakening of the momentum of the coolant flowing through the chip entry prevention groove is suppressed, enabling more coolant to reach the tip of the tap. [Effects of Invention 10] In addition to providing the same effect as the 9th invention, in the chip entry prevention groove, in the tap groove where the coolant supply groove extends to a position approximately 1 / 3 or more of the tap groove in the range of the complete thread portion and has a non-through groove form having a groove end point (82), or in the tap groove where the coolant supply groove is a through groove form that does not have a groove end point (82) that penetrates the tap groove, the coolant reaches a position approximately 1 / 3 or more of the tap groove in the range of the complete thread portion (a position closer to the chamfer) and splashes at the groove end point (82), thereby realizing a form in which more coolant reaches the tip side of the tap groove (the chamfer); or in the through groove form in which the coolant supply groove reaches all the way to the tip of the tap groove and penetrates it, realizing a form in which more coolant reaches the tip side of the tap groove (the chamfer). [Effects of Invention 11] In addition to achieving the same effect as invention 9, the provision of a shallow portion in the tap groove means that the tap is thicker, thereby increasing the torsional strength of the tap and resulting in a durable tap that is less likely to break. Because the coolant supply groove is formed in a penetrating form in the shallow portion, and it is possible to make the groove depth of the coolant supply groove portion formed in the shallow portion a deep groove form, the coolant supplied by the coolant supply groove is released in greater volume and with more force to the deep tap groove portion, thereby achieving the effect of achieving a form in which more coolant reaches the tip side of the tap groove (the chamfer portion) with greater force. [Brief description of the drawings]

[0016] [Figure 1] 1A is a front view, FIG. 1B is a plan view, and FIG. 1C is an enlarged right side view of the first embodiment of the present invention. [Diagram 2]1A is a front view, FIG. 1B is a plan view, and FIG. 1C is an enlarged right side view of a second embodiment of the present invention. [Diagram 3] FIG. 11 is a front view (FIG. 1a) and an enlarged right side view (FIG. 1b) of a third embodiment of the present invention. [Figure 4] FIG. 11 is a right side view of the fourth embodiment of the present invention. [Diagram 5] FIG. 13 is a right side view of the fifth embodiment of the present invention. [Figure 6] FIG. 13 is a right side view of the sixth embodiment of the present invention. [Figure 7] FIG. 13 is a right side view of the seventh embodiment of the present invention. [Figure 8] FIG. 13 is a right side view of the eighth embodiment of the present invention. [Figure 9] 13A is a front view, FIG. 13B is a plan view, and FIG. 13C is an enlarged right side view of a ninth embodiment of the present invention. [Figure 10] 13A is a front view, FIG. 13B is a plan view, and FIG. 13C is an enlarged right side view of the tenth embodiment of the present invention. [Figure 11] 11A is a front view, FIG. 11B is a plan view, and FIG. 11C is an enlarged right side view of the eleventh embodiment of the present invention. [Figure 12] FIG. 23 is a right side view of the twelfth embodiment of the present invention. [Figure 13] FIG. 23 is a right side view of the thirteenth embodiment of the present invention. [Figure 14] 14 is a front view (FIG. 1a), a plan view (FIG. 1b), and an enlarged right side view (FIG. 1c) of the fourteenth embodiment of the present invention. [Figure 15] FIG. 23 is a front view of the fifteenth embodiment of the present invention. [Figure 16] 16 is a plan view (FIG. 1a), a WW cross-sectional view (FIG. 1b), and a XX cross-sectional view (FIG. 1c) of a sixteenth embodiment of the present invention. [Figure 17] FIG. 23 is a right side view of the sixteenth embodiment of the present invention. [Figure 18] FIG. 23 is a right side view of the seventeenth embodiment of the present invention. [Figure 19] FIG. 23 is a right side view of the eighteenth embodiment of the present invention. [Figure 20] FIG. 23A is a plan view and FIG. 23B is an enlarged right side view of the nineteenth embodiment of the present invention. [Figure 21] FIG. 20 is a plan view (FIG. 2a) and an enlarged right side view (FIG. 2b) of the twentieth embodiment of the present invention. [Figure 22]FIG. 21 is a plan view (FIG. 2a) and an enlarged right side view (FIG. 2b) of the twenty-first embodiment of the present invention. [Diagram 23] FIG. 22 is a plan view (FIG. 2a) and an enlarged right side view (FIG. 2b) of the twenty-second embodiment of the present invention. [Figure 24] 23A is a plan view of the 23rd embodiment of the present invention, FIG. 23B is a cross-sectional view taken along line YY, and FIG. 23C is a cross-sectional view taken along line ZZ. [Diagram 25] 24 is a front view (a), a plan view (b), and an enlarged right side view (c) of the twenty-fourth embodiment of the present invention. [Figure 26] FIG. 25 is a right side view of the twenty-fifth embodiment of the present invention. [Figure 27] FIG. 26 is a right side view of the twenty-sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, examples of the best mode for carrying out the present invention will be described. However, it is not intended that the present invention be limited to these examples. In addition, in the description of the following examples, the same components as those in the above-mentioned examples will be designated by the same reference numerals, and duplicated descriptions will be omitted. EXAMPLES

[0018] In the first embodiment of the present invention shown in FIG. 1, a cutting tap 1 has the following configuration. [Definition] (1) The term "chip entry prevention groove" refers to a tap groove that, when the pilot hole forming the female thread is a blind hole, functions as a groove that releases (pushes) chips into the pilot hole space, which is the space of the pilot hole that extends beyond the threaded portion, depending on the amount and / or force of coolant supplied, thereby preventing the chips from entering the chip entry prevention groove. (2) "Chip discharge groove (a form that functions as a groove that does not allow chips to enter)" refers to a tap groove that functions as a chip discharge groove that moves within the groove so that, when the pilot hole forming the female thread is a blind hole, the coolant containing the chips released from the chip entry prevention groove into the pilot hole space is discharged to the outside from the pilot hole opening, which is the opening of the pilot hole. (3) "Chip discharge groove connecting coolant supply groove" refers to a coolant supply groove that is connected to the chip discharge groove and supplies coolant to the chip discharge groove, In the case where the pilot hole is a through hole, the coolant supplied from the chip discharge groove communication coolant supply groove flows through the chip discharge groove, reaches the tip side of the threaded portion, and cools the tip side. When the pilot hole is a blind hole, the groove has a coolant supply form (for example, a coolant supply form in terms of the amount and force of coolant, or either one of the coolant supply forms) that cannot prevent coolant containing chips released in the chip entry prevention groove from entering the chip discharge groove and being discharged to the outside from the pilot hole opening. This also applies to the following examples.

[0019] A tap body 7 having a plurality of threaded portions 4 (a first threaded portion 4a, a second threaded portion 4b, a third threaded portion 4c, and a fourth threaded portion 4d) each including a chamfering portion 2 for cutting and forming a female thread and a complete thread portion 3, a shank portion 5, and a square portion 6 provided at the tip (rear end) of the shank portion 5; The threaded portion 4 for cutting and forming a female thread in the pilot hole A may be two, three, five or more. Tap grooves formed between adjacent threaded portions 4 (here, a first tap groove 9a (chip discharge groove) is formed between the first threaded portion 4a and the second threaded portion 4b, a second tap groove 9b (chip entry prevention groove) is formed between the second threaded portion 4b and the third threaded portion 4c, a third tap groove 9c (chip entry prevention groove) is formed between the third threaded portion 4c and the fourth threaded portion 4d, and a fourth tap groove 9d (chip entry prevention groove) is formed between the fourth threaded portion 4d and the first threaded portion 4a). and coolant supply grooves at least as many as the number of tap grooves, for supplying coolant (which may be supplied in liquid form or in mist form) from the rear end side of the shank portion 5 to each of all the tap grooves. (Here, a first coolant supply groove 10a (chip discharge groove connecting coolant supply groove) is provided to supply coolant to the first tap groove 9a (chip discharge groove), a second coolant supply groove 10b is provided to supply coolant to the second tap groove 9b (chip entry prevention groove), a third coolant supply groove 10c is provided to supply coolant to the third tap groove 9c (chip entry prevention groove), and a fourth coolant supply groove 10d is provided to supply coolant to the fourth tap groove 9d (chip entry prevention groove).) At least one of the coolant supply grooves (here, the first coolant supply groove 10a, but there may be more than one) has a different groove width, a different groove depth, or a chip discharge groove-connecting coolant supply groove (here, the first coolant supply groove 10a with a different groove depth) from the other coolant supply grooves (here, the second coolant supply groove 10b, the third coolant supply groove 10c, and the fourth coolant supply groove 10d), and The cross-sectional area of ​​the first coolant supply groove 10a (chip discharge groove connecting coolant supply groove) is smaller than the cross-sectional area of ​​the other coolant supply grooves (excluding the case where a through coolant supply hole is provided in the form of a through hole from the rear end side of the shank portion 5 to the tip side of the threaded portion 4 in order to supply coolant from the rear end side of the shank 5 and release it from the tip side of the threaded portion 4).

[0020] A coolant reservoir 11 in the form of a hole is formed at the rear end of the shank portion 5, and coolant introduction grooves are provided to introduce coolant from the coolant reservoir 11 to each of the coolant supply grooves (here, a first coolant introduction groove 12a is provided to supply coolant to the first coolant supply groove 10a, a second coolant introduction groove 12b is provided to supply coolant to the second coolant supply groove 10b, a third coolant introduction groove 12c is provided to supply coolant to the third coolant supply groove 10c, and a fourth coolant introduction groove 12d is provided to supply coolant to the fourth coolant supply groove 10d). The cross-sectional area of ​​the coolant introduction groove 12a of the first coolant supply groove 10a (chip discharge groove connecting coolant supply groove) is smaller than the cross-sectional area of ​​the coolant introduction grooves of the other coolant supply grooves.

[0021] The first coolant supply groove 10a, which is a chip discharge groove connecting coolant supply groove, is also a small amount coolant supply groove which jets and supplies a smaller amount of coolant than the other coolant supply grooves. All the coolant supply grooves have the same groove width, and the other coolant supply grooves (second coolant supply groove 10b to fourth coolant supply groove 10d) have the same groove depth which is deeper than the first coolant supply groove 10a. All the coolant supply grooves and all the coolant introduction grooves are positioned substantially on the center line B of each tap groove.

[0022] The term "a position located on the line B approximately at the center of each tap groove" includes within its technical scope both a configuration in which the coolant supply groove reaches the tap groove and a configuration in which the coolant supply groove does not reach the tap groove but the coolant is injected and supplied to the tap groove. The same applies to the following inventions.

[0023] The embodiment does not have a through coolant supply hole (center through hole) provided in the form of a through hole from the rear end side of the shank 5 to the front end side of the threaded portion 4 for supplying coolant from the rear end side of the shank 5 and discharging it from the front end side of the threaded portion 4, meaning that this embodiment does not include an embodiment in which a through coolant supply hole (center through hole) provided in the form of a through hole from the rear end side of the shank 5 to the front end side of the threaded portion 4 is provided. The same applies to the taps in the following embodiments. In addition, the cutting edge of the cutting edge portion of the tap groove, which is the chip intrusion prevention groove, is preferably in the form of a point tap blade or a point tap groove, which is a form that discharges chips in the same direction as the direction of advancement. The same applies to the cutting taps in the following examples.

[0024] The following effects are achieved. (1) In forming a cutting thread in which the pilot hole A is a through hole, coolant is supplied to all of the tap grooves (tap grooves 9a to 9d). The amount of coolant supplied from the chip discharge groove connecting coolant supply groove (first coolant supply groove 10a) is smaller than the amount supplied from the other coolant supply grooves (second coolant supply groove 10b to fourth coolant supply groove 10d) (because the groove cross-sectional area of ​​the chip discharge groove connecting coolant supply groove is smaller than the groove cross-sectional area of ​​the other coolant supply grooves). However, even in the tap grooves that receive a jet supply from the chip discharge groove connecting coolant supply groove, the cutting edge is cooled by the supplied coolant, frictional resistance is reduced, and the cut chips are pushed downward by the coolant and quickly discharged from the lower opening of the pilot hole A. (2) When the pilot hole A is a blind hole and a cutting thread is formed, the amount of coolant supplied from the chip discharge groove connecting coolant supply groove (first coolant supply groove 10a) to the tap groove 9a (chip discharge groove) is less than the amount of coolant supplied from the other coolant supply grooves (second coolant supply groove 10b to fourth coolant supply groove 10d) to each of the tap grooves 9b to 9d (chip entry prevention grooves), while the amount of coolant supplied to the other coolant supply grooves is greater than the amount of coolant supplied from the chip discharge groove connecting coolant supply groove to the tap groove (chip discharge groove). Therefore, in thread formation of a blind hole, the coolant (containing chips) in the other coolant supply grooves (second coolant supply groove 10b to fourth coolant supply groove 10d) pushes up and pushes away the coolant (containing chips) in the chip discharge groove connecting coolant supply groove (first coolant supply groove 10a), or changes its flow direction to the side where the influence of the coolant in the first coolant supply groove 10a (chip discharge groove connecting coolant supply groove) is weaker, and then rises up the tap groove 9a (chip discharge groove) to discharge the coolant and chips from the upper opening of the pilot hole A (more precisely, the tap groove hole formed by the pilot hole 10a (represented by a two-dot chain line) and the tap groove 9a). That is, a cutting tap that can be used without any problems in blind holes is realized. (3) From the above (1) and (2), a cutting tap (hereinafter also referred to as a "dual-hole compatible tap") is realized that provides cooling effects, friction reduction effects, and chip evacuation effects, whether used for a through hole or a blind hole. For example, in cases where the same diameter thread formation in a blind hole and the same diameter thread formation in a through hole are mixed, one type of same diameter cutting tap can be used to handle both. For example, since cutting taps can be of only one type, a tap for both pilot holes, there is no need to separately manage taps for blind holes and taps for through holes, and mistakes such as using a through hole tap for a blind hole can be prevented, simplifying tap management. EXAMPLES

[0025] A second embodiment of the present invention shown in FIG. 2 differs from the first embodiment mainly in that a cutting tap 20 is formed in which the first coolant supply groove is a first coolant supply groove 21a and the first coolant inlet groove is a first coolant inlet groove 22a. The first coolant supply groove 21a has a groove opening located toward the second screw portion 4b (the position toward the cutting face 14b) in the right side view, has a groove depth that is approximately the same as those of the other coolant supply grooves (the second coolant supply groove 10b to the fourth coolant supply groove 10d), and has a groove width that is narrower than those of the other coolant supply grooves. In addition, the portion of the tap groove within the range of the thread portion 4 is referred to as the thread portion range groove portion (the tap groove portion within the range of the complete thread portion 3 is referred to as the complete thread portion range groove portion), and the first coolant supply groove 21a extends through the connecting first tap groove 9a (chip discharge groove) with a groove depth that cuts (forms) a groove into the groove bottom of the tap groove located at the thread portion range groove portion, and the groove end point 82 is located at a position where the progress of the coolant flowing through the coolant supply groove is hindered or the direction of progress is changed, causing the coolant to splash and hit the biting portion 2 well. The length of the first coolant supply groove 21a (= the length to the groove end point 82) is at least 1 / 3 of the length of the groove portion in the threaded portion range (the portion of the tap groove in the range of the threaded portion 4), preferably at least half the length, more preferably at least 2 / 3 the length, and most preferably the length that allows the coolant that reaches the groove end point 82 and splashes out to effectively hit (reach) the cutting portion 2. The first coolant introduction groove 22a, like the first coolant supply groove 21a, has a groove opening located closer to the second thread portion 4b (closer to the cutting face 14b) in the right side view, and its groove width is approximately the same as that of the first coolant introduction groove 22a. The groove widths of the second coolant introduction groove 12b to the fourth coolant introduction groove 12d which communicate with other coolant supply grooves (the second coolant supply groove 10b to the fourth coolant supply groove 10d) are approximately the same as the groove widths of the other coolant supply grooves. The first coolant supply groove 21a is a chip discharge groove connecting coolant supply groove, a small amount of coolant supply groove, and also a differently arranged coolant supply groove (an arrangement in which the arrangement position in the tap groove differs from that of other coolant supply grooves).

[0026] When used in a blind hole, the first tap flute 9a, which receives coolant from the first coolant supply groove 21a, functions as a chip discharge groove. In this case, the coolant flowing inside the first tap groove 9a (chip discharge groove) is supplied from the cutting face 14b side, so the amount and force of the coolant near the back surface 15a is weak, which makes it easier for the coolant and chips in the other coolant supply grooves (second coolant supply groove 10b to fourth coolant supply groove 10d) to flow and move toward the back surface 15a of the first tap groove 9a (chip discharge groove) and are then discharged. EXAMPLES

[0027] A third embodiment of the present invention shown in FIG. 3 is different from the second embodiment in that a cutting tap 25 is formed without a square portion 6. The threaded portion 4 and the shank 5 form a tap body 26 . The groove depth can be made deeper than the coolant supply groove passing through the center of the side of the square portion, which means that the groove depth can be made shallower, which means that the strength of the shank can be increased. The holder for gripping the shank 5 is preferably a shrink-fit holder that leaves no gaps in the side walls of the gripping portion. EXAMPLES

[0028] The fourth embodiment of the present invention shown in FIG. 4 differs from the first embodiment mainly in that a cutting tap 30 is formed with a first coolant introduction groove 29 connected to the first coolant supply groove 10a and having a groove width narrower than the groove width of the first coolant supply groove 10a (but with the same groove depth). Compared to other coolant supply grooves, the flow rate of the coolant in the first coolant supply groove 10a can be made slower and the flow rate can be made smaller. EXAMPLES

[0029] The fifth embodiment of the present invention shown in FIG. 5 differs from the third embodiment mainly in that a cutting tap 34 is formed in which a first coolant supply groove for supplying coolant to the first tap groove 9a (chip discharge groove) is a first coolant supply groove 33a (chip discharge groove connecting coolant supply groove, small amount coolant supply groove) having a groove width wider than (but the same groove depth as) the first coolant introduction groove 22a. The flow rate of the coolant in the first coolant supply groove 33a can be made smaller than that in the other coolant supply grooves. The first coolant supply groove 33a is a chip discharge groove connecting coolant supply groove, a small amount of coolant supply groove, and also a differently arranged coolant supply groove (an arrangement in which the arrangement position in the tap groove differs from that of other coolant supply grooves). EXAMPLES

[0030] The sixth embodiment of the present invention shown in FIG. 6 differs from the fifth embodiment mainly in that a cutting tap 37 is formed with a first coolant supply groove 36a (chip discharge groove connecting coolant supply groove, small amount coolant supply groove, misaligned coolant supply groove) having a groove width narrower than the groove width of the first coolant introduction groove 22a, as the first coolant supply groove 9a (chip discharge groove). EXAMPLES

[0031] The seventh embodiment of the present invention shown in FIG. 7 differs from the sixth embodiment mainly in that a cutting tap 42 is formed with a first coolant supply groove 40a (chip discharge groove connecting coolant supply groove, small amount coolant supply groove, differently positioned coolant supply groove) and a first coolant introduction groove 41a, in which the first coolant supply groove and the first coolant introduction groove for supplying coolant to the first tap groove 9a (chip discharge groove) are provided closer to the first thread portion 4a (back surface 15a) in the right side view. In other words, the position of the first coolant supply groove 40a is close to the back surface 15a of the first thread portion 4a which precedes the cutting, and is away from the cutting face 14b of the second thread portion 4b which is the groove side wall surface which receives the wind pressure associated with the cutting rotation. Since the first thread portion 40a acts as a windbreak, the scattering of coolant due to wind pressure is reduced and more coolant is delivered to the tip of the tap.

[0032] The following effects are achieved. (1) During the rotary cutting operation of the cutting tap 1, in the tap groove portion outside the pilot hole, air pressure (wind pressure) generated by the rotation hits directly against the cutting face 14b of the second thread portion 4b following the first thread portion 4a and tends to flow out of the tap groove. As a result, the coolant closer to the cutting face 14b is pushed out of the tap groove by the wind pressure and flows out. In contrast, the back surface 15a of the leading first thread portion 4a is not directly hit by (is not subjected to) wind pressure, so the coolant sprayed and supplied to the tap groove from the first coolant supply groove 40a (differently positioned coolant supply groove) provided at a position closer to the back surface 15a of the leading first thread portion 4a is not directly hit by the wind pressure generated by the rotation of the tap, resulting in the effect that more coolant is supplied into the pilot hole and reaches the tip of the tap. (2) Because of (1) above, a larger amount of coolant can be supplied to the pilot hole, so that the first coolant supply groove 40a (differently positioned coolant supply groove) can be made shallower than the other coolant supply grooves, thereby reducing the amount of coolant supplied or slowing down the coolant injection flow rate. (3) By virtue of (2) above, it is possible to make the differently positioned coolant supply grooves shallower, and forming shallow grooves makes the shank stronger and more rigid (the shallower the grooves, the thicker the non-grooved parts of the shank (solid core parts)). EXAMPLES

[0033] An eighth embodiment of the present invention shown in FIG. 8 differs from the seventh embodiment mainly in that a cutting tap 44 is formed in which the other coolant supply grooves, the second coolant supply groove to the fourth coolant supply groove, are positioned closer to the back surface of the land in the right side view.

[0034] in particular, The second coolant supply groove 45b (another coolant supply groove) is positioned closer to the back surface 15b of the second thread portion 4b in the right side view, and the groove depth is such that a groove is formed at the bottom of the second tap groove 9b (chip entry prevention groove) and the groove penetrates to the tip of the tap, and the second coolant introduction groove 46b is also positioned closer to the second thread portion 4b, The third coolant supply groove 45c (another coolant supply groove) is positioned toward the back surface 15c of the third thread portion 4c in the right side view, and the groove depth is such that a groove is formed at the bottom of the third tap groove 9c (chip entry prevention groove) and the groove penetrates to the tip of the tap, and the third coolant introduction groove 46c is also positioned toward the second thread portion 4c. The fourth coolant supply groove 45d (another coolant supply groove) is positioned toward the back surface 15d of the fourth screw portion 4d in the right side view, and its groove depth is such that a groove is formed at the bottom of the second tap groove and the groove penetrates to the tip of the tap, and the fourth coolant introduction groove 46d is also positioned toward the fourth screw portion 4d in the right side view.

[0035] The coolant supplied from the other coolant supply grooves, the second coolant supply groove 45b to the fourth coolant supply groove 45, is positioned closer to the center position line 3 on the back side of the preceding thread portion. As a result, each coolant is not exposed to direct wind pressure from the preceding thread portion, and the amount of coolant splashing out from within the tap groove is reduced, thereby achieving the effective effect of increasing the amount of coolant that reaches the tip of the tap. When a large amount of coolant reaches the tip of the tap, it is possible to make the groove depth of all or part of the other coolant supply grooves (for example, the groove portions in the full thread area) shallower, which increases the strength of the shank 5.

[0036] The second coolant supply groove 45b, the third coolant supply groove 45c, and the fourth coolant supply groove 45d may be formed substantially on the center line B, or closer to the rake face. EXAMPLES

[0037] In a ninth embodiment of the present invention shown in FIG. 9, a cutting tap 50 has the following configuration. A tap body 7 having a threaded portion 4 consisting of a chamfering portion 2 for cutting and forming a female thread in a pilot hole A and a complete thread portion 3, a shank portion 5, and a square portion 6 provided at the tip of the shank portion 5 (there is also a form without the square portion 6), A first threaded portion 4a, a second threaded portion 4b, a third threaded portion 4c, and a fourth threaded portion 4d (the number of threaded portions may be two, three, five or more). Tap grooves formed between adjacent threaded portions 4 (here, a first tap groove 9a (chip discharge groove) is formed between the first threaded portion 4a and the second threaded portion 4b, a second tap groove 9b (chip entry prevention groove) is formed between the second threaded portion 4b and the third threaded portion 4c, a third tap groove 9c (chip entry prevention groove) is formed between the third threaded portion 4c and the fourth threaded portion 4d, and a fourth tap groove 9d (chip entry prevention groove) is formed between the fourth threaded portion 4d and the first threaded portion 4a). and a coolant supply groove at least as many as the number of tap grooves, for supplying coolant (which may be supplied in liquid form or in mist form) from the rear end side of the shank portion 5 to each of all the tap grooves. (Here, a first coolant supply groove 51a is provided for supplying coolant to the first tap groove 9a (chip discharge groove), a second coolant supply groove 51b is provided for supplying coolant to the second tap groove 9b (chip entry prevention groove), a third coolant supply groove 51c is provided for supplying coolant to the third tap groove 9c (chip entry prevention groove), and a fourth coolant supply groove 21d is provided for supplying coolant to the fourth tap groove 9d (chip entry prevention groove).) provided on the outer periphery of the shank portion 5, A hole-shaped coolant reservoir 11 is formed at the rear end of the shank portion 5, and coolant introduction grooves are provided to introduce coolant from the coolant reservoir 11 to each of the coolant supply grooves (here, a first coolant introduction groove 52a is provided to supply coolant to the first coolant supply groove 51a, a second coolant introduction groove 52b is provided to supply coolant to the second coolant supply groove 51b, a third coolant introduction groove 52c is provided to supply coolant to the third coolant supply groove 51c, and a fourth coolant introduction groove 52d is provided to supply coolant to the fourth coolant supply groove 51d). In the right side view, the first coolant supply groove 51a and the first coolant introduction groove 52a are arranged in a position closer to the back surface 15a of the first thread portion 4a of the first tap groove 9a (chip discharge groove), In the right side view, the second coolant supply groove 51b and the second coolant introduction groove 52b are arranged at positions closer to the back surface 15b of the second threaded portion 4b of the second tap groove 9b (chip intrusion prevention groove), In the right side view, the third coolant supply groove 51c and the third coolant introduction groove 52c are arranged at positions closer to the back surface 15c of the third thread portion 4c of the third tap groove 9c (chip intrusion prevention groove), In the right side view, the fourth coolant supply groove 51 d and the fourth coolant introduction groove 52 d are arranged closer to the back surface 15 d of the fourth thread portion 4 d of the fourth tap groove 9 d (chip intrusion prevention groove), The cutting tap 50 is configured without a through coolant supply hole provided in the form of a through hole from the rear end side of the shank 5 to the tip side of the threaded portion 4 for supplying coolant from the rear end side of the shank 5 and releasing it from the tip side of the threaded portion 4; in other words, it is a tap having a configuration that excludes a through coolant supply hole. The embodiment does not have a through coolant supply hole (center through hole) provided in the form of a through hole from the rear end side of the shank 5 to the front end side of the threaded portion 4 for supplying coolant from the rear end side of the shank 5 and discharging it from the front end side of the threaded portion 4, meaning that this embodiment excludes embodiments in which a through coolant supply hole (center through hole) is provided in the form of a through hole from the rear end side of the shank 5 to the front end side of the threaded portion 4. The same applies to other embodiments.

[0038] The following effects are achieved. Cutting tap 50 is a tap best suited for use in or exclusively for through holes. The state of wind pressure (air flow) generated within the tap groove outside the pilot hole A (within the tap groove that has not yet entered the pilot hole) by the rotating tap action for cutting is a cutting edge surface wind pressure hit state, facing the cutting edge side and hitting the scooping face, which is the rising surface on the cutting edge side. As a result, a significant amount of coolant in the tap groove that does not enter the pilot hole is pushed out of the tap groove by the wind when it hits the cutting edge. In particular, the coolant on the rake face side is pushed out of the tap groove by the wind pressure caused by the cutting rotation of the tap, reducing the amount of coolant that reaches the tip of the tap. In the cutting tap 50, all coolant supply grooves are provided (positioned) near the back side of the threaded portion which is leading in the cutting operation, so that the threaded portion prevents or reduces the effects of wind pressure caused by the cutting rotation of the tap, thereby reducing the effect of splashing coolant outside the tap grooves due to wind pressure and increasing the amount of coolant that reaches the tip of the tap.

[0039] The first coolant supply groove 51a, the second coolant supply groove 51b, the third coolant supply groove 51c, and the fourth coolant supply groove 51d extend through the connecting tap grooves in a groove depth form that forms (carves) a groove into the groove bottom of the tap groove located in the threaded portion 4, and the groove end point 82 is located at a position where the progress of the coolant flowing through the coolant supply groove is not impeded or the direction of progress is changed so that the coolant does not splash or is redirected so that the coolant hits the biting portion 2 effectively. The position of the groove end point 82 (= the length of the coolant supply groove) should be at least 1 / 3 of the groove area of ​​the threaded portion (the area of ​​the tap groove in the area of ​​the threaded portion 4), preferably at least half of the area, more preferably at least 2 / 3 of the area, and most preferably the length of the coolant supply groove should be such that the coolant that reaches the groove end point 82 and splashes out hits the biting portion 2 well (reaches the groove well).

[0040] The first coolant supply groove 51a, the second coolant supply groove 51b, the third coolant supply groove 51c, and the fourth coolant supply groove 51d may be formed at a position approximately on the center line B, or may be formed closer to the cutting face. EXAMPLES

[0041] The tenth embodiment of the present invention shown in FIG. 10 differs from the ninth embodiment mainly in that a cutting tap 55 is formed in a configuration in which a coolant supply groove for supplying coolant to the first tap groove 9a (chip discharge groove) is not provided (and therefore a coolant introduction groove is not provided in the square portion 6). The cutting tap 55 is a tap that is best suited for use in blind holes or is used exclusively for blind holes. When cutting threads into blind holes, the coolant and chips in the second tap flute 9b (chip entry prevention groove) to the fourth tap flute 9d (chip entry prevention groove) are discharged from the tip of the tap into the pilot hole, flow into the first tap flute 9a (chip discharge groove), rise (move), and are discharged to the outside from the pilot hole opening. EXAMPLES

[0042] In an eleventh embodiment of the present invention shown in FIG. 11, a cutting tap 65 has the following configuration. A tap body 7 having a threaded portion 4 consisting of a chamfering portion 2 for cutting and forming a female thread and a complete threaded portion 3, a shank portion 5, and a square portion 6 provided at the tip of the shank portion 5 (there is also a form without the square portion 6), A first threaded portion 4a, a second threaded portion 4b, a third threaded portion 4c, and a fourth threaded portion 4d, Tap grooves formed between adjacent threaded portions 4 (here, a fifth tap groove 9e (chip entry prevention groove) is formed between the first threaded portion 4a and the second threaded portion 4b, a second tap groove 9b (chip entry prevention groove) is formed between the second threaded portion 4b and the third threaded portion 4c, a third tap groove 9c (chip entry prevention groove) is formed between the third threaded portion 4c and the fourth threaded portion 4d, and a fourth tap groove 9d (chip entry prevention groove) is formed between the fourth threaded portion 4d and the first threaded portion 4a). The shank portion 5 is provided on its outer periphery with coolant supply grooves, the number of which is at least equal to the number of tap grooves, for supplying coolant (which may be supplied in liquid form or in mist form, etc.) from the rear end side of the shank portion 5 to each of all the tap grooves. In this embodiment, a first coolant supply groove 63a is provided which is connected to the fifth tap groove 9e (chip entry prevention groove) and supplies coolant to the fifth tap groove 9e (chip entry prevention groove), and a second coolant supply groove 63b is provided which is connected to the fifth tap groove 9e (chip entry prevention groove) and supplies coolant to the fifth tap groove 9e (chip entry prevention groove). ) is provided with a second coolant supply groove 63b which is connected to the second tap groove 9b (chip entry prevention groove) and supplies coolant to the second tap groove 9b (chip entry prevention groove), a third coolant supply groove 63c which is connected to the third tap groove 9c (chip entry prevention groove) and supplies coolant to the third tap groove 9c (chip entry prevention groove), and a fourth coolant supply groove 63d which is connected to the fourth tap groove 9d (chip entry prevention groove) and supplies coolant to the fourth tap groove 9d (chip entry prevention groove). A coolant reservoir 11 in the form of a hole is formed at the rear end of the shank portion 5, and coolant introduction grooves are provided to introduce coolant from the coolant reservoir 11 to each of the coolant supply grooves (here, a first coolant introduction groove 64a is provided to supply coolant to the first coolant supply groove 63a, a second coolant introduction groove 64b is provided to supply coolant to the second coolant supply groove 63b, a third coolant introduction groove 64c is provided to supply coolant to the third coolant supply groove 63c, and a fourth coolant introduction groove 64d is provided to supply coolant to the fourth coolant supply groove 63d). In the right side view, the first coolant supply groove 63a and the first coolant introduction groove 64a are arranged at a position closer to the rake face 14b of the second thread portion 4b of the fifth tap groove 9e (chip intrusion prevention groove), In the right side view, the second coolant supply groove 63b and the second coolant introduction groove 64b are arranged in a position closer to the rake face 14c of the third thread portion 4c of the second tap groove 9b (chip intrusion prevention groove), In the right side view, the third coolant supply groove 63c and the third coolant introduction groove 64c are arranged closer to the rake face 14c of the third thread portion 4c of the third tap groove 9c (chip intrusion prevention groove), In the right side view, the fourth coolant supply groove 63d and the fourth coolant introduction groove 64d are positioned near the cutting face 14a of the first thread portion 4a at the fourth tap groove 9 (chip entry prevention groove) (excluding the form in which a through coolant supply hole (center through hole) is provided in the form of a through hole from the rear end side of the shank portion 5 to the tip side of the thread portion 4 for supplying coolant from the rear end side of the shank 5 and releasing it from the tip side of the thread portion 4).

[0043] The form of all the coolant supply grooves, including the first coolant supply groove 63a, extends through the connecting tap grooves with a groove depth that cuts a groove into the groove bottom located at the threaded portion 4, and the groove end point 82 is a position where the progress of the coolant flowing through the coolant supply groove is impeded or the direction of progress is changed, causing the coolant to splash (splash into the hole formed by the tap groove and the pilot hole) and where more of the coolant hits (reaches) the biting portion 2. The position of groove end point 82 (= length of coolant supply groove) is a position (= length of coolant supply groove) that corresponds to at least 1 / 3 of the groove area of ​​the threaded portion (the area of ​​the tap groove in the area of ​​the threaded portion 4), preferably at least half of the area, more preferably at least 2 / 3 of the area, and most preferably the length of the coolant supply groove that realizes a position where the coolant that reaches groove end point 82 and is released and splashed can effectively hit (reach) the biting portion 2.

[0044] Cutting tap 65 is a tap best suited for use in through holes or exclusively for use in through holes. In addition, a tap groove without a coolant supply groove (for example, the fifth tap groove 9e (chip entry prevention groove)) may be provided, and the first tap groove 9a (chip discharge groove) without the first coolant supply groove 63a may be used as a blind hole tap that functions as a groove exclusively for discharging coolant and chips. EXAMPLES

[0045] In the twelfth embodiment of the present invention shown in FIG. 12, the main difference from the eighth embodiment is that a cutting tap 70 is formed in which the back surface of the first threaded portion 4a is the back surface 68a, the back surface of the second threaded portion 4b is the back surface 68b, the back surface of the third threaded portion 4c is the back surface 68c, the back surface of the fourth threaded portion 4d is the back surface 68d, and the shank is the shank 69.

[0046] In the right side view, the inclination angle of the back surface 68a is substantially the same as the inclination angle of the side wall of the first coolant supply groove 45a, and the back surface 68a is substantially connected to the side wall of the first coolant supply groove 45a with almost no or only a slight step. In the right side view, the inclination angle of the back surface 68b is substantially the same as the inclination angle of the side wall of the second coolant supply groove 45b, and the back surface 68b is substantially connected to the side wall of the second coolant supply groove 45b with almost no or only a slight step. In the right side view, the inclination angle of the back surface 68c is substantially the same as the inclination angle of the side wall of the third coolant supply groove 45c, and the back surface 68c is substantially connected to the side wall of the third coolant supply groove 45c with almost no or only a slight step. In the right side view, the inclination angle of the back surface 68d is approximately the same as the side wall angle of the fourth coolant supply groove 45d, and is substantially connected to the side wall of the fourth coolant supply groove 45d with almost no or only a small step.

[0047] The shank 69 has a diameter slightly smaller than the diameter of the pilot hole A and is in a form that can be inserted into the pilot hole A (all or part of it). The shank may have a diameter larger than the diameter of pilot hole A. EXAMPLES

[0048] Example 13 of the present invention shown in Figure 13 is different from Example 12 mainly in that a cutting tap 74 is formed in which the back surface of the threaded portion is made into back surfaces 73a to 73d, and the first coolant supply groove 40a, the second coolant supply groove 45b, the third coolant supply groove 45c, and the fourth coolant supply groove 45d are inclined at an angle substantially the same as the inclination angle (including vertical) of the back surfaces 73a to 73d, and the connecting surfaces are in a connecting form with substantially no steps. In the right side view, the rear surfaces 73a to 73d have a shape in which the cut grooves are located at the upper part and form a substantially vertical wall surface. Further, the second coolant supply groove 45b, the third coolant supply groove 45c and the fourth coolant supply groove 45d have a stepped portion near the back surface, which extends to the tip of the tap. Moreover, the first coolant supply groove 40a is in the form of a through groove that extends to the tip of the tap. The second coolant supply groove 45b, the third coolant supply groove 45c and the fourth coolant supply groove 45d may be made deep (for example, the groove bottom position is approximately the same as the groove bottom of the tap groove) to form a through groove shape in which the groove extends to the tip of the tap, or the groove end point 82 may be made to wobbly so that the groove does not penetrate all the way through. By using such a groove shape, it is possible to ensure that a large amount of coolant hits the tip of the tap (the biting portion) with force.

[0049] <Cutting tools> The technical concept of the present invention can also be applied to tools having multiple flutes, such as rolling taps (forming taps), drills, reamers, etc. It is particularly suitable for cutting tools that cut and enlarge a pre-formed pilot hole. EXAMPLES

[0050] The fourteenth embodiment of the present invention shown in Figure 14 differs from the ninth embodiment mainly in that a cutting tap 80 is formed in which a first coolant supply groove 79a is provided in the first tap groove 9a (chip discharge groove), a second coolant supply groove 79b is provided in the second tap groove 9b (chip entry prevention groove), a third coolant supply groove 79c is provided in the third tap groove 9c (chip entry prevention groove), and a fourth coolant supply groove 79d is provided in the fourth tap groove 9c. (A) The second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d are The recesses are formed near the rear walls of the rear surfaces 15b, 15c, and 15d, and a part or the whole of the recesses are cut into the curved walls of the rear surfaces 15b, 15c, and 15d. The groove width is substantially the same as the groove width, and the groove bottom position is substantially the same as the groove bottom position of the tap groove. The groove direction is substantially the same as the center position line B. The second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d are formed so that a part or the whole of the groove is cut into the curved wall of the back surface 15b, 15c, and 15d, respectively, so that the coolant supply groove is formed at the tip of the tap where the back surface wall is connected and penetrates to the tip. Because the amount of coolant supplied is large and the flow rate is fast, the chips cannot rise up the tap flutes and are discharged toward the tip of the tap (these three tap flutes do not function as chip discharge flutes to discharge chips from the opening of the pilot hole). Therefore, the coolant supplied to the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d passes through the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d and reaches the tip of the tap, thereby increasing the amount of coolant released toward the tip side and providing the effect of having a strong coolant force. (a) The first coolant supply groove 79a is The groove depth is shallower than the second coolant supply groove 79b, and the groove width is narrower. The forming position is a position close to the rake face 14b, Since the amount of coolant supplied is less than that of the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d and the flow path position is shallower, in forming a thread in a blind hole, the joint coolant of the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d, which has a greater coolant flow rate and momentum, overcomes the coolant of the first coolant supply groove 79a, and draws up all the chips, rises up the first tap groove 9a (chip discharge groove), and discharges them from the pilot hole. The first tap groove 9a (chip discharge groove) functions as a discharge groove, and the cutting edge 13b etc. of the first tap groove 9a (chip discharge groove) are cooled by the joint coolant of the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d. As a result, the coolant in the first coolant supply groove 79a does not reach the cutting edge and does not function as a coolant. Furthermore, since the first coolant supply groove 79a is located close to the scooping face 14b, there is almost no or only a weak effect of coolant spray on the opposing back surface 15a, and the confluent coolant from the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d smoothly rises along the back surface 15a and is discharged. (c) When the pilot hole is a through hole, the coolant in the first coolant supply groove 79a reaches the tip of the tap and cools the cutting edge 13b, etc., and the coolant in the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d also cool their respective cutting edges, etc.

[0051] This is as follows in the progression of the cutting operation for a while from the start of thread formation in the pilot hole. In conventional configurations (such as the invention of Patent Document 1) in which a coolant supply groove is provided on the axis, for a while after starting to cut the pilot hole, much of the coolant scatters into the space, resulting in a small amount of coolant being supplied to the chamfer and a weak force. This means that the chamfer cannot be cooled sufficiently for a while after starting to cut the pilot hole, and there is insufficient force to push the chips out towards the other end of the tap, increasing the risk of the chips becoming trapped in the tap groove, and increasing the risk of the chips getting caught or the chips clogging the tap. In contrast, the cutting tap 80 has the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d which have long groove shapes, so that an appropriate amount and force of coolant reaches and reliably hits the chamfer 2 from the time when thread formation of the pilot hole begins. This allows the chamfer to be sufficiently cooled from the time when cutting of the pilot hole begins and ensures that the generated chips are pushed into the pilot hole space on the other side of the tap.

[0052] The second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d may be provided closer to the rake face 14c, the rake face 14d, and the rake face 14a. Also, the second coolant supply groove 79b, the third coolant supply groove 79c, and the fourth coolant supply groove 79d may be provided on the curved inclined surfaces (rake faces) of the rake faces 14c, the rake faces 14d, and the rake faces 14a, and a deeper coolant supply groove is realized. EXAMPLES

[0053] The fifteenth embodiment of the present invention shown in Figure 15 differs from the fourteenth embodiment mainly in that a cutting tap 83 is formed in which the second coolant supply groove, the third coolant supply groove, and the fourth coolant supply groove are formed as a second coolant supply groove 81b, a third coolant supply groove 81c, and a fourth coolant supply groove 81d, which have non-through groove shapes that extend to a position close to the tip of the tap and do not pass through the tip of the tap (here, the groove end point 82 is at a position slightly toward the shank portion 5 before reaching the biting portion 2). The coolant flowing through the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d does not hit or is redirected along the groove end wall, which is the wall of the groove end point 82, and is scattered into the holes formed by the pilot hole and the tap groove, thereby providing the effect of efficiently cooling the cutting edge of the chamfer portion 1 and the pilot hole wall during cutting. The groove end wall of the groove end point 82 may have a gently curved or inclined surface shape, a steeply inclined surface shape, a vertical wall, etc., and the optimal position of the groove end point 82 varies depending on the shape of the groove end wall, but it is preferable to position the groove end point 82 at a position where most of the splashed coolant hits the biting portion 2 effectively (a position where it reaches well).

[0054] Figure 15 compares the second coolant supply groove 10b (whose groove bottom is at the same position as the groove bottom of the second tap groove 9b (chip entry prevention groove)) located on the center position line B (on the axial center line) with the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d. The coolant in the second coolant supply groove 10b splashes just before the threaded portion 4, but in the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d, coolant splashes near the cutting edge 2 of the threaded portion 4 and within the hole formed by the tap groove and the pilot hole from the start to the end of cutting, and the splashed coolant is designed to splash at a position where it can effectively hit (reach) the cutting edge 2.

[0055] This means that when thread formation begins in the pilot hole and during the cutting operation thereafter, in the second coolant supply groove 10b, much of the coolant is scattered into the space, resulting in little coolant being supplied to the biting portion 2 and with weak force, whereas the cutting tap 83 has a long groove shape (a shape in which the groove end point 82 is located near the biting portion) in the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d, which ensure that an appropriate amount of coolant hits the biting portion 2 with great force (a shape that reaches well). As a result, the cutting tap 83 has a long groove configuration in which the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d provide a configuration in which an appropriate amount and force of coolant hits (reaches) the chamfering portion 2 well from the time the pilot hole threading starts to the time the threading is completed, so that the chamfering portion can be cooled well from the time the pilot hole cutting starts and chips generated from the time cutting starts are reliably pushed into the pilot hole space at the end of the tap.

[0056] The second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d may be provided closer to the rake face 14c, the rake face 14d, and the rake face 14a. Also, the second coolant supply groove 81b, the third coolant supply groove 81c, and the fourth coolant supply groove 81d may be provided on the inclined surfaces (rake faces) of the rake faces 14c, the rake faces 14d, and the rake faces 14a, respectively, to realize a coolant supply groove with a deeper groove depth. EXAMPLES

[0057] The sixteenth embodiment of the present invention shown in FIGS. 16 and 17 is different from the seventh embodiment in that: When using blind holes, The third tap groove 9c (chip entry prevention groove) is a seventh tap groove 9g (chip discharge groove) in a form that discharges chips and coolant to the outside from the opening of the pilot hole A, A first coolant supply groove 84a having a shallow groove shape is provided near the back surface 15a of the shank 5, the first coolant supply groove 84a being connected to the first tap groove 9a (chip discharge groove) and supplying a small amount of coolant in a thin jet form to the first tap groove 9a (chip discharge groove), A sixth coolant supply groove 84g having a shallow groove shape is provided near the back surface 15c of the shank 5, and the sixth coolant supply groove 84g is connected to the seventh tap groove 9g (chip discharge groove) and supplies a small amount of coolant in a thin jet form to the seventh tap groove 9g (chip discharge groove). The second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove) are configured to function as chip push-out grooves that push (release) chips into the pilot hole space on the tap end by supplying a larger amount of coolant than the first coolant supply groove 84a and the sixth coolant supply groove 84g (chip entry prevention grooves that do not function as chip discharge grooves), The second tap groove 9b (chip entry prevention groove) is composed of a second shallow tap groove portion 9b1 which is a shallow groove extending from the shank 5 side toward the tip of the tap, and a second deep tap groove portion 9b2 which is located closer to the tip of the tap than the second shallow tap groove portion 9b1 and extends toward the tip of the tap and has a deeper groove form than the second shallow tap groove portion 9b1 (the groove bottom is closer to the axis than the groove bottom of the second shallow tap groove portion 9b1). The fourth tap groove 9d (chip entry prevention groove) is composed of a fourth shallow tap groove portion 9d1, which is a shallow groove extending from the shank 5 side toward the tip of the tap, and a fourth deep tap groove portion 9d2, which is located closer to the tip of the tap than the fourth shallow tap groove portion 9d1 and extends toward the tip of the tap, and is deeper than the fourth shallow tap groove portion 9d1 (the groove bottom is closer to the axis than the groove bottom of the fourth shallow tap groove portion 9d1). A second coolant supply groove 84b is provided that extends from the shank 5 through the second shallow tap groove portion 9b1 to the second deep tap groove portion 9b2. A fourth coolant supply groove 84d is provided, which extends from the shank 5 through the fourth shallow tap groove portion 9d1 to the fourth deep tap groove portion 9d2, The second coolant supply groove 84b is composed of a first groove portion 84b1 passing through the shank portion 5 and a second groove portion 84d2 passing through the second shallow tap groove portion 9b1 (the groove bottoms of the first groove portion 84b1 and the second groove portion 84d2 are straight and connected with almost no steps). The fourth coolant supply groove 84d is composed of a first groove portion 84d1 passing through the shank portion 5 and a fourth groove portion 84d2 passing through the fourth shallow tap groove portion 9d1 (the groove bottoms of the first groove portion 84d1 and the second groove portion 84d2 are in a straight connecting form with almost no step), A part of the coolant passing through the second coolant supply groove 84b is released and scattered at the end position of the first groove portion 84b1, and the coolant flowing on the bottom side of the groove flows through the second groove portion 84b2 and is released and scattered into the second deep tap groove portion 9b2, where it hits the chamfering portion 2, thereby realizing a configuration in which efficient cooling, etc. is performed. The cutting tap 87 is formed in such a manner that a portion of the coolant passing through the fourth coolant supply groove 84d is released and splashed at the end position of the first groove portion 84d1, and the coolant flowing along the bottom side of the groove flows through the second groove portion 84d2 and is released and splashed into the fourth deep tap groove portion 9d2, where it hits the biting portion 2 and efficiently performs cooling, etc.

[0058] The height of the second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 need only be such that the formed female thread does not come into contact with them, and it is preferable to make them as high as possible. The tips of the second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 are preferably configured so as not to reach the position of the biting portion 2, and are of a length that falls within the range of the complete thread portion 3 (complete thread portion range groove portion). The second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 do not affect the curling of the chips, whereas the second deep tap groove portion 9b2 and the fourth deep tap groove portion 9d2 affect the curling of the chips. The coolant from the second coolant supply groove 84b and the fourth coolant supply groove 84d flows into the first tap groove 9a (chip discharge groove) and the seventh tap groove 9g (chip discharge groove) due to its momentum and amount of coolant, and despite the coolant from the first coolant supply groove 84a and the sixth coolant supply groove 84g (a coolant supply form in which the amount of coolant is small and the momentum is weak and the coolant is supplied toward the outside of the tap groove), it rises up the tap groove while dragging along the chips, and is discharged to the outside through the pilot hole opening. In the case of a tap dedicated to blind hole thread formation, the first coolant supply groove 84a and the sixth coolant supply groove 84g may not be provided.

[0059] The second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 thicken the threaded portion 4, thereby realizing a tap with increased torsional strength that is less likely to break. The second coolant supply groove 84b and the fourth coolant supply groove 84d may have various groove depths and widths, and by making the groove depth shallower, the torsional strength of the tap is increased. EXAMPLES

[0060] The seventeenth embodiment of the present invention shown in FIG. 18 is different from the sixteenth embodiment in that: The groove width of the second tap groove 9b (chip intrusion prevention groove) is narrowed, The groove width of the fourth tap groove 9d (chip intrusion prevention groove) is narrowed, The groove width of the first tap groove 9a (chip discharge groove) is widened, The width of the seventh tap groove 9g (chip discharge groove) is increased, The first coolant supply groove 84a is disposed on the center position line B. The sixth coolant supply groove 84g is disposed on the center position line B, The cutting tap 89 has a narrow groove width, which reduces the curl of chips formed by the cutting action of the second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove), and also speeds up chip folding to shorten the chip length, while the first tap groove 9a (chip discharge groove) and the seventh tap groove 9g (chip discharge groove) have wider groove widths, which enables quick chip discharge. EXAMPLES

[0061] The eighteenth embodiment of the present invention shown in FIG. 19 is different from the seventeenth embodiment in that: The second coolant supply groove 84b is formed so that the groove is also formed at the bottom of the second tap groove 9b (chip entry prevention groove) and is a non-through groove, the groove end point 82 is formed at a position that does not reach the biting portion, and the groove end point 82 has a vertical wall form or an inclined wall form and serves to direct the coolant injection direction or splash direction more toward the biting portion, The fourth coolant supply groove 84d is formed in such a manner that the groove is also formed at the bottom of the fourth tap groove 9d (chip entry prevention groove) and is a non-through groove, the groove end point 82 is formed at a position that does not reach the biting portion, and the groove end point 82 has a vertical wall form or an inclined wall form and serves to direct the injection direction or scattering direction of the coolant more toward the biting portion, The first coolant supply groove 84a is disposed closer to the rake face 14b. The cutting tap 90 is formed such that the third coolant supply groove 84c is disposed at a position closer to the rake face 14d. EXAMPLES

[0062] In a nineteenth embodiment of the present invention shown in FIG. 20, a cutting tap 92 is The second tap groove 9b (chip ingress prevention groove) is provided with a raised portion 94b that is formed in a shape that rises from the groove bottom of the second tap groove 9b (chip ingress prevention groove) and is connected to the shank portion 5 on the side closer to the rake face 14c toward the tip side of the tap (axial direction) and is within the range of the complete thread portion 3 (complete thread portion range groove portion), The fourth tap groove 9d (chip ingress prevention groove) is provided with a raised portion 94d that is formed in a shape that rises from the groove bottom of the fourth tap groove 9d (chip ingress prevention groove), connects to the shank portion 5 on the side closer to the rake face 14a, and is formed in a shape that fits within the range of the complete thread portion 3 (complete thread portion range groove portion) toward the tap tip side. A second coolant supply groove 95b, the groove bottom of which is located at substantially the same position as the groove bottom of the second tap groove 9b (chip intrusion prevention groove), is provided in a manner passing through the shank 5 and the protruding portion 94b. A fourth coolant supply groove 95d, the groove bottom position of which is substantially the same as the groove bottom position of the fourth tap groove 9d (chip intrusion prevention groove), is provided in a form passing through the shank 5 and the protruding portion 94d, A first coolant supply groove 84a having a shallower groove depth than the second coolant supply groove 95b is provided on the shank 5 near the back surface 15a in such a manner that the coolant is injected into the first tap groove 9a (chip discharge groove); The shank 5 is configured such that a sixth coolant supply groove 84g, the groove depth of which is shallower than the groove depth of the second coolant supply groove 95b, is provided near the back surface 15c and in a form that injects and supplies coolant into the seventh tap groove 9g. The raised portions 94b and 94d do not affect the curling of the chips. The portions that affect the curling of the chips are the approximate ranges of the chamfer 2 ahead of the second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove).

[0063] The height of the raised portion 94b, 94d may be any height that does not cause the formed female thread to come into contact with the raised portion, and is preferably as high as possible. The tips of the raised portions 94b and 94d are preferably configured so as not to reach the position of the chamfering portion 2, and are of a length that fits within the range of the complete thread portion 3 (the complete thread portion range groove portion). The length of the raised portion 94b, the length of the raised portion 94d, the groove end point 82 (=groove length) of the second coolant supply groove 95b, and the groove end point 82 of the fourth coolant supply groove 95d are preferably set to lengths that realize a position where the coolant that reaches the groove end point 82 and is released and scattered hits the biting portion 2 well (reaches the bit well), and the position of the groove end point 82 is preferably at a position that is at least 1 / 3, preferably at least half, and more preferably at least 2 / 3 of the way through the groove portion in the threaded portion range (the portion of the tap groove in the range of the threaded portion 4).

[0064] The raised portions 94b and 94d thicken the threaded portion 4, thereby realizing a tap that has increased torsional strength and is less likely to break.

[0065] Alternatively, the raised portion 94b and the second coolant supply groove 95b may be provided closer to the rear surface 15b, and the raised portion 94d and the fourth coolant supply groove 95d may be provided closer to the rear surface 15d. EXAMPLES

[0066] In the twentieth embodiment of the present invention shown in FIG. 21, a cutting tap 97 is The second tap groove 9b (chip ingress prevention groove) is provided with a raised portion 98b formed in a form that rises from the groove bottom of the second tap groove 9b (chip ingress prevention groove) in the form of a partition wall, connects to the shank portion 5, and is formed in a form that fits within the range of the complete thread portion 3 (complete thread portion range groove portion) toward the tap tip side, The fourth tap groove 9d (chip ingress prevention groove) is provided with a raised portion 98d formed in a form that rises from the groove bottom of the fourth tap groove 9d (chip ingress prevention groove) in the form of a partition wall, connects to the shank portion 5, and is formed in a form that fits within the range of the complete thread portion 3 (complete thread portion range groove portion) toward the tap tip side, A second coolant supply groove 99b, the groove bottom position of which is substantially the same as the groove bottom position of the second tap groove 9b (chip intrusion prevention groove), is provided in a form passing through the shank 5 and the protruding portion 98b, A fourth coolant supply groove 99d, the groove bottom position of which is substantially the same as the groove bottom position of the fourth tap groove 9d (chip intrusion prevention groove), is provided in a form passing through the shank 5 and the protruding portion 98d, A first coolant supply groove 84a having a shallower groove depth than the second coolant supply groove 99b is provided on the shank 5 near the back surface 15a in such a manner that the coolant is injected into the first tap groove 9a (chip discharge groove); The shank 5 is configured such that a sixth coolant supply groove 84g, the groove depth of which is shallower than the groove depth of the second coolant supply groove 99b, is provided near the back surface 15c and in a form that injects and supplies coolant into the seventh tap groove 9g.

[0067] The raised portion 98b and the raised portion 98d do not affect the curling of the chips. The portion that affects the curling of the chips is the approximate range of the chamfer 2 on the front side of the second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove). The raised portions 98b and 98d thicken the threaded portion 4, thereby realizing a tap that has increased torsional strength and is less likely to break.

[0068] The height of the raised portions 98b and 98d may be any height that does not cause the formed female thread to come into contact with the raised portions, and is preferably as high as possible. The tips of the raised portions 98b and 98d are preferably configured so as not to reach the position of the chamfering portion 2, and are of a length that fits within the range of the complete thread portion 3 (the complete thread portion range groove portion). The length of the raised portion 98b, the length of the raised portion 98d, the groove end point 82 (=groove length) of the second coolant supply groove 99b, and the groove end point 82 (=groove length) of the fourth coolant supply groove 99d are preferably set to lengths that realize a position where the coolant that reaches the groove end point 82 and is released and scattered hits the biting portion 2 well (reaches the bit well), and the position of the groove end point 82 is preferably set to a position that corresponds to at least 1 / 3 of the groove portion in the threaded portion range (the portion of the tap groove in the range of the threaded portion 4), preferably at least half of the groove portion, and more preferably at least 2 / 3 of the groove portion. The second coolant supply groove 99b and the fourth coolant supply groove 99d may have various groove depths and widths, and the shallower the groove depth, the stronger the torsional strength. In this embodiment, no coolant supply grooves are provided in the raised portions 98b and 98d, and instead, the raised portions 98b and 98d act as partition walls with grooves (hereinafter also referred to as the "left side groove" and "right side groove") formed on the left and right sides thereof. Therefore, it is also possible to provide a coolant supply groove that supplies coolant to the left side groove, the right side groove, or either one of the grooves. EXAMPLES

[0069] The twenty-first embodiment of the present invention shown in FIG. 22 is different from the twenty-first embodiment in that: The groove of the second coolant supply groove 99b is formed (carved) to the groove bottom of the second tap groove 9b (chip entry prevention groove), and the groove end point 82 is located at a position past the raised portion 98b, and the groove end point 82 has a vertical wall or an inclined wall shape. Therefore, the coolant that hits the groove end point 82 changes direction and splashes, realizing a shape that hits the biting portion well. The cutting tap 100 is formed in such a way that the groove of the fourth coolant supply groove 99d is formed (carved) to the bottom of the fourth tap groove 9d (chip entry prevention groove), the groove end point 82 is located at a position past the raised portion 98d, and the groove end point 82 has a vertical wall or an inclined wall form. Therefore, the coolant that hits the groove end point 82 changes direction and splashes, realizing a form in which it hits the biting portion well. EXAMPLES

[0070] In a twenty-second embodiment of the present invention shown in FIG. 23, a cutting tap 102 has the following configuration. A partition wall 103b is provided at approximately the center of the second tap groove 9b (chip entry prevention groove) at a height that does not contact the female thread formed in the pilot hole A, and at a length up to the edge of the chamfer 2 (a length that does not interfere with the cutting action of the chamfer and the formation of chips), or in a form that connects to the shank portion and fits within the range of the complete thread portion (within the complete thread portion range groove portion) toward the tap tip side. The second tap groove 9b (chip intrusion prevention groove) is divided into two grooves by the partition wall 103b, forming a back surface groove 104b and a cutting surface groove 105b. A partition wall 103d is provided at approximately the center of the fourth tap groove 9d (chip entry prevention groove) at a height that does not contact the female thread formed in the pilot hole A, and at a length up to the edge of the chamfer 2 (a length that does not interfere with the cutting action of the chamfer and the formation of chips), or in a form that connects to the shank portion and fits within the range of the complete thread portion (complete thread portion range groove portion) toward the tap tip side. The fourth tap groove 9d (chip intrusion prevention groove) is divided into two grooves by the partition wall 103d, forming a back surface groove 104d and a cutting surface groove 105d. A second coolant supply groove 99b, whose bottom is located at approximately the same position as the bottom of the second tap groove 9b (chip entry prevention groove), is provided in a form that passes through the shank 5 and communicates with the cutting surface side groove 105b, and the coolant flowing through the second coolant supply groove 99b is sprayed into the cutting surface side groove 105b, which is a narrow groove form, and flows through the cutting surface side groove 105b to reach the biting portion 2. A fourth coolant supply groove 99d, whose bottom is at approximately the same position as the bottom of the fourth tap groove 9d (chip entry prevention groove), is provided in a form that passes through the shank 5 and is connected to the cutting surface groove 105d, and the coolant flowing through the fourth coolant supply groove 99d is sprayed into the cutting surface groove 105d, which is a narrow groove, and flows inside the cutting surface groove 105d to reach the biting portion 2.

[0071] The partition walls 103b and 103d do not affect the curling of the chips. The areas that affect the curling of the chips are the approximate ranges of the chamfering portion 2 on the front side of the second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove). The tips of the partition walls 103b and 103d are preferably configured so as not to reach the position of the chamfering portion 2, and are of a length that fits within the range of the complete thread portion 3 (the complete thread portion range groove portion). Since the coolant is guided to the cutting surface grooves 105b and 105d, which have a groove width approximately half or less than the groove width of the tap groove, the amount of coolant that reaches the chamfer 2 increases. A coolant supply groove may be provided in the rear side groove 104b and the rear side groove 104d. EXAMPLES

[0072] The twenty-third embodiment of the present invention shown in FIG. 24 is different from the sixteenth embodiment in that: The second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 are formed into an inclined surface shape that slopes downwardly and substantially straight from the shank side toward the tap tip side, The groove configuration of the second coolant supply groove 84b and the fourth coolant supply groove 84d is such that a groove is formed at the groove bottom of the second tap groove 9b (chip entry prevention groove) and the fourth tap groove 9d (chip entry prevention groove), and the groove end point is a groove end point 82 consisting of a wall (vertical wall or inclined wall) that changes the direction of the coolant or scatters it, thereby forming a cutting tap 106. Each groove end point 82 is located beyond the inclined surface end point 107 of the second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1. The second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 do not affect the curling of the chips. It is the second deep tap groove portion 9b2 and the fourth deep tap groove portion 9b2 that affect the curling of the chips.

[0073] The second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 thicken the threaded portion 4, thereby realizing a tap with increased torsional strength that is less likely to break. EXAMPLES

[0074] The 24th embodiment of the present invention shown in Figure 25 differs from the 1st embodiment mainly in that the second coolant supply groove 10b, the third coolant supply groove 10c, and the fourth coolant supply groove 10d have groove lengths that extend to approximately 2 / 3 of the groove portion of the threaded portion, and grooves are formed (carved) into the tap grooves, with the groove end point being groove end point 82, so that the coolant that reaches groove end point 82 does not hit the wall of groove end point 8 or is redirected and scattered so as to hit the biting portion 2 effectively, forming a cutting tap 109.

[0075] The groove bottoms of the second tap groove 9b (chip entry prevention groove), the third tap groove 9c (chip entry prevention groove), and the second tap groove 9d are made approximately flat, and the groove bottoms of the second coolant supply groove 10b, the third coolant supply groove 10c, and the fourth coolant supply groove 10d are made approximately flat. This configuration increases the groove depth and cross-sectional area of ​​the groove, thereby increasing the flow rate of coolant. The amount of coolant supplied from the first coolant supply groove 10a to the first tap groove 9a (chip discharge groove) is less than the amount of coolant sprayed from the second coolant supply groove 10b to the fourth coolant supply groove 10d to the tap groove, and is sprayed to a position away from the tap groove. When forming a blind hole, the combined coolant containing the chips from the second coolant supply groove 10b to the fourth coolant supply groove 10d does not push aside the coolant from the first coolant supply groove 10a, or changes its flow direction to a side where the coolant from the chip discharge groove connecting coolant supply groove is less affected, and rises up the first tap groove 9a (chip discharge groove) and is discharged outside from the opening of the pilot hole. Therefore, in blind hole machining, the first tap groove 9a (chip discharge groove) functions as a groove dedicated to discharge. In addition, when machining a through hole, the coolant supplied from the first coolant supply groove 10a to the first tap groove 9a (chip discharge groove) flows through the first tap groove 9a (chip discharge groove) and reaches the chamfer portion 2 to cool the tap tip.

[0076] It is also possible to make the groove shape of the first tap groove 9a (chip discharge groove) the same as that of the second tap groove 9b (chip entry prevention groove) and the groove shape of the first coolant supply groove 10a the same as that of the second coolant supply groove 10b, thereby making it a tap dedicated to blind holes. EXAMPLES

[0077] The 25th embodiment of the present invention shown in FIG. 26 is different from the 16th embodiment in that: The tap grooves are provided in six locations, namely, the first tap groove 9a (chip discharge groove) to the sixth tap groove 9f (chip entry prevention groove), The groove widths of the second tap groove 9b (chip entry prevention groove) to the sixth tap groove 9f (chip entry prevention groove) are narrower than the groove width of the first tap groove 9a (chip discharge groove), The land is provided at six locations, namely, the first screw portion 4a to the sixth screw portion 4f, The land widths of the first thread portion 4a to the sixth thread portion 4f in this embodiment 25 are narrower than the land widths of the first thread portion 4a to the fourth thread portion 4d in the embodiment 16, In this embodiment 25, the second tap groove 9b (chip entry prevention groove) to the sixth tap groove 9f (chip entry prevention groove) are provided with a second shallow tap groove portion 9b1 to a sixth shallow tap groove portion 9f1, and the groove depths of the second shallow tap groove portion 9b1 to the sixth shallow tap groove portion 9f1 in this embodiment 25 are shallower than the groove depths of the second shallow tap groove portion 9b1 and the fourth shallow tap groove portion 9d1 in embodiment 16, thereby forming a cutting tap 111.

[0078] For example, the cutting tap 87 of Example 16 has four thread portions, and when the number of cutting edges at the chamfering portion of each thread portion is three, the total number of cutting edges is 3 cutting edges x 4 thread portions = 12 cutting edges, whereas the cutting tap 111 with six thread portions when the number of cutting edges at the chamfering portion is three has a total number of cutting edges of 3 cutting edges x 6 thread portions = 18 cutting edges. In other words, the cutting depth (cutting thickness) of one cutting edge of the cutting tap 111 is smaller than that of one cutting edge of the cutting tap 87, so that the durability of the cutting edge of the cutting tap 111 is improved and the cutting chips are thinner, thereby enabling the formation of a highly accurate female thread. In addition, the chips are curled and cut off in the second deep tap groove portion 9b2 to the sixth deep tap groove portion 9f2, which are thin and have a narrow groove width, and are released into the pilot hole space at the end of the tap, flow into the first tap groove 9a (chip discharge groove), and are discharged to the outside. In forming the threads of a blind hole, the second tap groove 9b (chip entrance prevention groove) to the sixth tap groove 9 (chip entrance prevention groove) f are tap grooves that function as chip entrance prevention grooves that do not discharge chips.

[0079] The heights of the second shallow tap groove portion 9b1 to the sixth shallow tap groove portion 9f1 need only be such that they do not come into contact with the formed female thread, and are preferably as high as possible. The coolant from the second shallow tap groove portion 9b1 to the sixth shallow tap groove portion 9f1 (chip entry prevention groove) flows into the first tap groove 9a (chip discharge groove) due to its momentum and amount of coolant, and despite the coolant from the first coolant supply groove 84a (a coolant supply form in which the amount of coolant is small and the momentum is weak and the coolant is supplied toward the outside of the tap groove), it rises up the tap groove, dragging along the chips, and is discharged from the pilot hole opening. In the case of a tap dedicated to blind hole thread formation, the first coolant supply groove 84a and the third coolant supply groove 84c may not be provided. The number of threaded portions is preferably 5 or more, more preferably 6 or more. EXAMPLES

[0080] The 26th embodiment of the present invention shown in FIG. 27 is different from the 25th embodiment in that: The cutting tap 113 has a feature in that the second deep tap groove portion 9b2 to the sixth deep tap groove portion 9f2 (chip intrusion prevention grooves) have shallow groove depths, thereby increasing the torsional strength.

[0081] The taps in the above-mentioned embodiments are cutting blade taps, but they can also be applied to thread-form taps that have no cutting edge and form female threads by plastic processing. The concept is that the thread-form tap can be realized by changing the shape of each thread of the threaded portion in the cutting tap of the embodiment to a thread shape without cutting edges (rolled thread, thread-formed thread, rolled thread).

[0082] [Additional Invention] [Additional Invention 1] Coolant supply groove connected to chip discharge groove A tap body having a threaded portion and a shank portion that form a female thread; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion, and the number of the coolant supply grooves is at least the same as the number of the tap grooves for supplying coolant from the rear end side of the shank portion to each of all of the tap grooves. At least one of the coolant supply grooves is a chip discharge groove-connecting coolant supply groove having a different groove width, a different groove depth, or a different groove width and a different groove depth from the other coolant supply grooves; The groove cross-sectional area of ​​the chip discharge groove connecting coolant supply groove is smaller than the groove cross-sectional area of ​​the other coolant supply grooves (excluding a tap having a through coolant supply hole provided in the form of a through hole from the rear end side of the shank to the tip side of the threaded portion for supplying coolant from the rear end side of the shank and discharging it from the tip side of the threaded portion). [Appendix 2] Coolant supply groove connected to chip discharge groove A tap body having a threaded portion and a shank portion that form a female thread; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion, and the number of the coolant supply grooves is at least the same as the number of the tap grooves for supplying coolant from the rear end side of the shank portion to each of all of the tap grooves. At least one of the coolant supply grooves is a chip discharge groove connecting coolant supply groove having a groove depth shallower than the groove depths of the other coolant supply grooves (excluding a tap having a through coolant supply hole provided in the form of a through hole from the rear end side of the shank to the tip side of the threaded portion for supplying coolant from the rear end side of the shank and discharging it from the tip side of the threaded portion). [Additional Invention 3] A groove for supplying a small amount of coolant A tap body having a threaded portion and a shank portion that form a female thread; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion, and the number of the coolant supply grooves is at least the same as the number of the tap grooves for supplying coolant from the rear end side of the shank portion to each of all of the tap grooves. At least one of the coolant supply grooves is a small amount of coolant supply groove in which the amount of coolant sprayed is smaller than the amount of coolant sprayed from the other coolant supply grooves (excluding a tap having a through coolant supply hole provided in the form of a through hole from the rear end side of the shank to the tip side of the threaded portion for supplying coolant from the rear end side of the shank and releasing it from the tip side of the threaded portion). [Additional Invention 4] A groove for supplying a small amount of coolant A coolant introduction groove is provided at the rear end of the shank portion to introduce coolant into each of the coolant supply grooves, In the tap according to Supplementary Invention 3, the cross-sectional area of ​​the inlet groove of the small amount coolant supply groove is smaller than the cross-sectional area of ​​the inlet groove of the other coolant supply groove. [Additional Invention 5] Coolant supply grooves arranged differently near the threaded portion A tap body having a threaded portion and a shank portion that form a female thread; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion, and the number of the coolant supply grooves is at least the same as the number of the tap grooves for supplying coolant from the rear end side of the shank portion to each of all of the tap grooves. At least one of the coolant supply grooves is a differently positioned coolant supply groove that is positioned closer to the threaded portion than the center position line (B) of the tap groove, and the other coolant supply grooves are positioned approximately on the center position line (B) of the tap groove (excluding a tap having a through coolant supply hole that is provided in the form of a through hole from the rear end side of the shank to the tip side of the threaded portion for supplying coolant from the rear end side of the shank and releasing it from the tip side of the threaded portion). The "center position line (B) of the tap flute" means that the technical scope includes both a configuration in which the coolant supply groove reaches the tap flute and a configuration in which the coolant supply groove does not reach the tap flute but coolant is injected and supplied to the tap flute. The same applies to the following appended inventions. The "center position line (B) of the tap flute" is an axis extending from the tip side of the tap to the rear end side of the shank. In addition, in a configuration in which the tap flute is curved, it is a line extending from the center position of the rear end of the tap flute along the axis of the shank to the rear end side. The same is true for the subsequent appended inventions. [Additional Invention 6] Coolant supply grooves arranged differently near the threaded portion The wall surface of each tap groove is formed by a back surface of a leading thread portion during thread formation and a rake surface of a trailing thread portion following the leading thread portion and located on the opposite side of the back surface, In the tap according to Supplementary Invention 5, the position of the differently positioned coolant supply groove is closer to the back surface side of the preceding thread portion. The "preceding thread portion" refers to the thread portion that precedes thread formation (for example, cutting), and the "trailing thread portion" refers to the thread portion that follows the preceding thread portion, and one tap groove is formed with the back surface of the trailing thread portion and the rake face of the preceding thread portion as the opposing groove wall surfaces. [Appendix 7] Coolant supply grooves arranged differently near the threaded portion The differently positioned coolant supply groove has a groove cross-sectional area smaller than the groove cross-sectional area of ​​the other coolant supply groove, a groove depth shallower than the groove depth of the other coolant supply groove, or an amount of coolant sprayed is smaller than the amount of coolant sprayed of the other coolant supply groove, in the tap described in any one of Supplementary Inventions 5 and 6. [Additional Invention 8] Differently arranged coolant supply grooves near the threaded portion (partially or entirely) A tap body having a threaded portion and a shank portion that form a female thread; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, This is a tap in which the position of all or part of the coolant supply groove is closer to the threaded portion than the center position line (B) of the tap groove (excluding a tap having a through coolant supply hole that is provided in the form of a through hole from the rear end side of the shank to the tip side of the threaded portion so that coolant can be supplied from the rear end side of the shank and released from the tip side of the threaded portion). [Additional Invention 9] Differently arranged coolant supply grooves near the threaded portion (partially or entirely) A tap body having a threaded portion and a shank portion that form a female thread; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, The wall surface of each tap groove is formed by the back surface of a leading thread portion during thread formation and the rake surface of a trailing V that follows the leading thread portion and is located on the opposite side of the back surface, This is a tap in which all or part of the coolant supply groove is positioned near the back surface side of the preceding threaded portion (excluding a tap having a through coolant supply hole that is provided in the form of a through hole from the rear end side of the shank to the tip side of the threaded portion so that coolant is supplied from the rear end side of the shank and released from the tip side of the threaded portion). [Appendix 10] A tap body having a threaded portion and a shank portion that form a female thread; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, This is a tap, in which all or a part of the coolant supply groove is disposed at a position closer to the threaded portion than a center position line (B) of the tap groove. [Appendix 11] A tap body having a threaded portion and a shank portion that form a female thread; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, The tap groove connected to the coolant supply groove has a deep tap groove portion located on the tip side of the tap and a shallow tap groove portion located on the fully threaded portion side, the shallow tap groove portion being shallower than the deep tap groove portion, The shallow tap groove portion is a tap (for example, the tap of Example (16)) in which the coolant supply groove is formed. [Appendix 12] A tap body having a threaded portion and a shank portion that form a female thread; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, At least one of the tap grooves is a narrow tap groove having a narrow groove width, The tap grooves other than the narrow tap grooves have a wide groove width and are wide tap grooves, The coolant supply groove is connected to the narrow tap groove, and the tap (for example, the tap of Example (17)) has a narrow tap groove coolant supply groove that is configured to supply the coolant to the narrow tap groove. [Appendix 13] A wide groove coolant supply groove is provided, which is a coolant supply groove connected to the wide tap groove, The wide groove coolant supply groove has a groove depth shallower than the groove depth of the narrow tap groove coolant supply groove, and a groove width narrower than the groove width of the narrow tap groove coolant supply groove. The tap according to appended invention 12 (e.g., the tap of Example (18)) has a cross-sectional area narrower than the cross-sectional area of ​​the narrow tap groove coolant supply groove, the amount of coolant supplied is less than the groove width of the narrow tap groove coolant supply groove, or the flow rate of the coolant is slower than the flow rate of the narrow tap groove coolant supply groove. [Effects of the Invention] [Effect of Supplementary Invention 1] Chip discharge groove connecting coolant supply groove "At least one of the coolant supply grooves is a chip discharge groove connecting coolant supply groove having a different groove width, a different groove depth, or a different groove width and a different groove depth from the other coolant supply grooves, The cross-sectional area of ​​the chip discharge groove communicating coolant supply groove is smaller than the cross-sectional area of ​​the other coolant supply grooves, and thus the following advantageous effects are achieved. (1) In thread formation of a through hole, coolant is supplied to all of the tap grooves, and the amount of coolant supplied from the chip discharge groove connecting coolant supply groove is small compared to the amount supplied from the other coolant supply grooves (because the groove cross-sectional area of ​​the chip discharge groove connecting coolant supply groove is smaller than the groove cross-sectional area of ​​the other coolant supply grooves). However, even in the tap grooves that receive a jet supply of coolant from the chip discharge groove connecting coolant supply groove, the cutting edge is cooled by the supplied coolant, frictional resistance is reduced, and the cut chips are pushed downward by the coolant and quickly discharged from the lower opening of the pilot hole. (2) In thread formation of a blind hole, the amount of coolant supplied from the chip discharge groove connecting coolant supply groove to the tap groove (chip discharge groove) is less than the amount of coolant supplied from the other coolant supply grooves to the tap groove (chip entry prevention groove), while the amount of coolant supplied to the other tap groove (chip entry prevention groove) is more than the amount of coolant supplied to the tap groove (chip discharge groove). Therefore, in a blind hole, the coolant (containing chips) in the other coolant supply groove does not push up the coolant (containing chips) in the chip discharge groove connecting coolant supply groove, but flows to the side where it is less affected by the coolant, and rises up the tap groove (chip discharge groove) and discharges the coolant and chips from the upper opening of the pilot hole (the upper opening of the tap groove hole formed by the tap groove (chip discharge groove) and the pilot hole). In other words, a tap that can be used without problems even in blind holes is realized. (3) From the above (1) and (2), a tap that provides cooling effects, friction reduction effects, and chip evacuation effects, whether used for a through hole or a blind hole, is realized (hereinafter also referred to as a "dual-hole compatible tap"). For example, in cases where the same diameter thread formation in a blind hole and the same diameter thread formation in a through hole are mixed, one type of same diameter tap can be used to handle both. For example, since only one type of tap can be used for both pilot holes, there is no need to separately manage taps for blind holes and taps for through holes, and mistakes such as using a through hole tap for a blind hole can be prevented, simplifying tap management. [Effect of Supplementary Invention 2] Chip discharge groove connecting coolant supply groove Since "at least one of the coolant supply grooves is a chip discharge groove connecting coolant supply groove having a groove depth shallower than the groove depths of the other coolant supply grooves," the following effects are achieved. This means that the coolant injection position from the chip discharge groove connecting coolant supply groove is at a position away from the bottom surface of the tap groove and outward, the injection range is thin, and the amount of coolant injected and supplied is less than the amount of coolant from other coolant supply grooves. This is because the thickness of the coolant supply is thin and close to the edge of the pilot hole opening (where the female thread is formed during thread formation). In other words, since the coolant is supplied at a position away from the bottom surface of the tap groove, it is sprayed to the side close to the wall surface (female thread surface) of the pilot hole formed by the tap groove and the pilot hole (hereinafter also referred to as the "tap groove hole"). Therefore, the coolant is sprayed in a concentrated manner close to the wall surface of the pilot hole of the tap groove hole, and the amount of coolant sprayed decreases as it approaches the bottom surface of the tap groove (hereinafter also referred to as the "coolant spray distribution: large amount on the outside, small amount on the inside"). The coolant injection distribution of a large amount on the outside and a small amount on the inside has the effect of allowing coolant and chips from other coolant supply grooves to flow into the bottom surface of the tap groove, where the coolant from the coolant supply groove connecting the chip discharge groove is less suppressed, and then rise up and become a discharge flow path for discharge outside the pilot hole, thereby achieving smooth discharge of coolant and chips. In other words, when used in a blind hole, a configuration is realized in which it is impossible or difficult to prevent coolant and chips from other coolant supply grooves from flowing into and being discharged to the outside of the tap groove supplied by the chip discharge groove connecting coolant supply groove, thereby making it possible to more smoothly discharge chips and coolant. [Effect of Supplementary Invention 3] Small amount of coolant supply groove Since the configuration is such that "at least one of the coolant supply grooves is a small amount of coolant supply groove, which supplies a smaller amount of coolant than the other coolant supply grooves," it has the same effect as the above-mentioned Supplementary Invention 1. [Effect of Supplementary Invention 4] Small amount of coolant supply groove In the supplementary invention 3, "a coolant introduction groove is provided at the rear end of the shank portion to introduce coolant into each of the coolant supply grooves, The cross-sectional area of ​​the inlet groove of the small amount coolant supply groove is smaller than the cross-sectional area of ​​the inlet groove of the other coolant supply grooves," thus providing the following advantageous effects. For example, in a configuration in which the cross-sectional area of ​​the inlet groove of the small amount coolant supply groove is the same as the cross-sectional area of ​​the inlet groove of the other coolant supply grooves, the amount of coolant in the small amount coolant supply groove is less than the amount of coolant in the other coolant supply grooves, thereby achieving the effective effect of making the spray force weaker. Therefore, when using a blind hole, the force suppressing the discharge of chips and coolant can be reduced, thereby enabling chips and coolant to be discharged more smoothly from the tap groove which receives a supply of coolant from the small amount coolant supply groove. [Effect of Supplementary Invention 5] Differently arranged coolant supply grooves Since "at least one of the coolant supply grooves is positioned closer to the threaded portion than the center position line (B) of the tap groove, i.e., a differently positioned coolant supply groove (a position offset from the center position line (B) of the tap groove toward the threaded portion), and the other coolant supply grooves are positioned approximately on the center position line (B) of the tap groove," the following effects are achieved. (1) Since the coolant supply groove is located away from the center position line (B) of the tap groove, the position into which the coolant flows is biased. As a result, the flow pressure on the side of the tap groove where the coolant supply groove is located, which is on one side of the center position line (B), is smaller than the flow pressure on the other side of the tap groove where the coolant supply groove is not located. As a result, the other side of the tap groove has a smaller amount of coolant and a smaller flow pressure than the one side (a state which may be called a flow path is formed). In thread formation of a blind hole, the coolant and chips from the other coolant supply groove flow into the tap groove through which the differently positioned coolant supply groove flows from the other side, where the flow pressure of the coolant is low and the flow rate is low (flow path), and rise up and are discharged from the pilot hole opening, or flow into the tap groove through which the differently positioned coolant supply groove flows, rise up, and are discharged outside the pilot hole from the other side while resisting the coolant from the differently positioned coolant supply groove. (2) In a tap having a square section (a section that is held by the chuck to prevent the tap from slipping) at the rear end of the shank, and a corner of the square section and a threaded section that are aligned with the axis (a common configuration), the center position line (B) of the other coolant supply groove is located at the center of a non-corner side of the square section. Because this center is a thin-walled section located inside the outer periphery of the shank, the introduction groove provided at the end of the square section that introduces coolant from the square section to the other coolant supply groove is shallow, and the cross-sectional area of ​​the introduction groove is small, resulting in a small amount of coolant being introduced. However, in the present appended invention 5, the differently positioned coolant supply groove is provided at a position closer to the threaded portion than the center position line (B) of the tap groove, so the introduction groove provided in the square portion is located closer to the corner side rather than at the center of the side, which has the effect of making the introduction groove deeper than the introduction groove on the center position line (B).This means that if the same amount of coolant is to be supplied as the other coolant supply grooves, the introduction groove can be made shallower, which means that the strength of the shank is increased, and in a configuration in which the amount of coolant supplied by the differently positioned coolant supply groove is made less than the amount of coolant supplied by the other coolant supply grooves, the differently positioned coolant supply groove can be made shallower. [Effect of Supplementary Invention 6] Differently arranged coolant supply grooves In the above-mentioned Supplementary Invention 5, "the position of the differently positioned coolant supply groove is closer to the back side of the preceding thread portion," so that it has the same effect as the above-mentioned Supplementary Invention 5 and also has the following effect. (1) When the tap is rotating to form a thread, the air pressure (wind pressure) generated by the rotation of the tap flute outside the pilot hole hits the cutting face of the trailing thread directly and tends to flow out of the tap flute. As a result, the coolant closer to the cutting face is pushed out of the tap flute by the wind pressure. In contrast, the back surface of the leading threaded portion is not directly hit by (is not subjected to) wind pressure, so the coolant sprayed and supplied to the tap groove from the differently positioned coolant supply groove located closer to the back surface of the leading threaded portion is not directly hit by the wind pressure generated by the rotation of the tap, resulting in the effective effect that more coolant is supplied into the pilot hole and reaches the tip of the tap. (2) By virtue of (1) above, a larger amount of coolant can be supplied to the pilot hole, so that the differently positioned coolant supply grooves can be made shallower than the other coolant supply grooves, thereby reducing the amount of coolant supplied or slowing down the coolant injection flow rate. (3) By virtue of (2) above, it is possible to make the differently positioned coolant supply grooves shallower, and forming shallow grooves makes the shank stronger and more rigid (the shallower the grooves, the thicker the non-grooved parts of the shank (solid core parts)). [Effect of Supplementary Invention 7] Differently arranged coolant supply grooves In either of Supplementary Inventions 5 and 6, since "the differently positioned coolant supply grooves have a groove cross-sectional area smaller than the groove cross-sectional area of ​​the other coolant supply grooves, a groove depth shallower than the groove depth of the other coolant supply grooves, or an amount of coolant sprayed and supplied is smaller than the amount of coolant sprayed and supplied of the other coolant supply grooves," the same effects as those of either of Supplementary Inventions 5 and 6 are achieved. [Effect of Supplementary Invention 8] Differently arranged coolant supply grooves Since the coolant supply groove is configured such that "all or part of the coolant supply groove is positioned closer to the threaded portion than the center line (B) of the tap groove," the following effects are achieved. (1) The configuration in which one of the coolant supply grooves is positioned closer to the threaded portion than the center line (B) of the tap groove corresponds to the differently positioned coolant supply groove of Supplementary Invention 5, and thus provides the same effects as those of Supplementary Invention 5. In addition, for example, in a configuration in which the two coolant supply grooves are staggered, it is possible to make the groove depth shallower if the coolant supply amount is the same as that of the coolant supply groove on the central position line (B), so the strength of the shank can be made stronger (the shallower the groove, the thicker the non-grooved part of the shank (solid core part)). (2) A configuration in which all of the coolant supply grooves are positioned closer to the threaded portion than the center line (B) of the tap groove makes it possible to make all of the coolant supply grooves shallow, which has the effect of making the shank even stronger (the shallower the grooves, the thicker the non-grooved portion of the shank (solid core portion)). [Effect of Supplementary Invention 9] Differently arranged coolant supply grooves Since the coolant supply groove is entirely or partially disposed near the rear surface side of the preceding threaded portion, the following advantageous effects are achieved. (1) A configuration in which one coolant supply groove is positioned toward the back side of the threaded portion provides the same effect as that of Supplementary Invention 6, and a configuration in which two coolant supply grooves are positioned toward the back side of the threaded portion provides the effect of making the shank stronger (the shallower the groove, the thicker the non-grooved portion of the shank (solid core portion)). (2) A configuration in which all of the coolant supply grooves are positioned toward the back side of the threaded portion has the effect of increasing the amount of coolant that reaches the tip of the tap (chasing portion). If the amount of coolant to the tip of the tap is not increased (not increased from the same amount as the coolant amount in the coolant supply groove located on the center line (B) of the tap groove), the amount of coolant supplied can be reduced, which can be achieved by making the coolant supply groove shallower. Therefore, forming a shallow coolant supply groove has the effect of making the shank even stronger (the shallower the groove, the thicker the non-grooved part of the shank (solid core part) will be). [Industrial Applicability]

[0083] The present invention is primarily applicable in industries that manufacture and use cutting tools such as cutting taps, rolled taps, and reamers. [Explanation of symbols]

[0084] A: Pilot hole, B: center position line, 1: Cutting tap, 2: Biting part, 3: Fully threaded section, 4: Screw part, 4a: first threaded portion; 4b: second threaded portion; 4c: the third screw part; 4d: fourth threaded portion; 4e: fifth screw part, 4f: sixth screw part, 5: Shank part, 6: Square part, 7: Tap body, 9a: First tap groove (chip discharge groove), 9b: Second tap groove (chip entry prevention groove), 9c: Third tap groove (chip entry prevention groove), 9d: 4th tap groove (chip entry prevention groove), 9e: 5th tap groove (chip prevention groove), 9f: 6th tap groove (chip prevention groove), 9g: 7th tap groove (chip discharge groove), 10a: First coolant supply groove (chip discharge groove connecting coolant supply groove, small amount coolant supply groove), 10b: second coolant supply groove; 10c: third coolant supply groove, 10d: 4th coolant supply groove, 11: Coolant reservoir, 12a: first coolant inlet groove, 12b: second coolant inlet groove; 12c: third coolant inlet groove, 12d: 4th coolant inlet groove, 13a~13d: Cutting blade, 14a-14d: rake face, 15a~15d: Back side, 20: Cutting tap, 21a: first coolant supply groove (chip discharge groove connecting coolant supply groove, small amount coolant supply groove, different arrangement coolant supply groove), 22a: first coolant inlet groove, 25: Cutting tap, 26: Tap body, 29: first coolant introduction groove 29, 30: Cutting tap, 33a: first coolant supply groove (chip discharge groove connecting coolant supply groove, small amount coolant supply groove, different arrangement coolant supply groove), 34: Cutting tap, 36a: first coolant supply groove (chip discharge groove connecting coolant supply groove, small amount coolant supply groove, different arrangement coolant supply groove), 37: Cutting tap, 40a: first coolant supply groove (chip discharge groove connecting coolant supply groove, small amount coolant supply groove, different arrangement coolant supply groove), 44: Cutting tap, 45b: second coolant supply groove; 45c: third coolant supply groove, 45d: fourth coolant supply groove, 46b: second coolant inlet groove; 46c: third coolant inlet groove, 46d: fourth coolant inlet groove, 50: Cutting tap, 51a: first coolant supply groove; 51b: second coolant supply groove; 51c: third coolant supply groove; 51d: fourth coolant supply groove, 52a: first coolant introduction groove, 52b: second coolant inlet groove; 52c: third coolant inlet groove, 52d: fourth coolant inlet groove, 55: Cutting tap, 63a: first coolant supply groove; 63b: second coolant supply groove; 63c: third coolant supply groove; 63d: fourth coolant supply groove, 64a: first coolant inlet groove, 64b: second coolant inlet groove, 64c: third coolant inlet groove, 64d: 4th coolant inlet groove, 65: Cutting tap, 68a~68d: Back 69: Shank, 70: Cutting tap, 73a~73d: Back side 74: Cutting tap, 79a: first coolant supply groove; 79b: second coolant supply groove; 79c: third coolant supply groove, 79d: fourth coolant supply groove, 80: Cutting tap, 81a: first coolant supply groove, 81b: second coolant supply groove; 81c: third coolant supply groove, 81d: fourth coolant supply groove, 82: groove end, 83: Cutting tap, 84a: first coolant supply groove, 84b: second coolant supply groove; 84b1: first groove site, 84d2: second groove site, 84c: third coolant supply groove, 84d: 4th coolant supply groove, 84g: 6th coolant supply groove, 84d1: first groove site, 84d2: fourth groove site, 9b1: second shallow tap groove portion; 9b2: second deep tap groove portion, 9c1: second shallow tap groove portion; 9c2: second deep tap groove portion; 9d1: 4th shallow tap groove area, 9d2: 4th deep tap groove portion, 9e1: fifth shallow tap groove portion, 9e2: 5th deep tap groove part, 9f1: sixth shallow tap groove portion, 9f2: 6th deep tap groove portion, 87: Cutting tap, 89: Cutting taps, 90: Cutting tap, 92: Cutting taps, 94b: Protruding part, 94d: raised part, 95b: second coolant supply groove; 95d: 4th coolant supply groove, 98b: Protruding part, 98d: raised part, 99b: second coolant supply groove; 99d: 4th coolant supply groove, 100: Cutting tap, 102: cutting tap, 103b: Partition wall, 103d: Partition wall, 104b: Back gutter, 104d: Back gutter, 105b: cutting surface gutter, 105d: cutting surface gutter, 106: Cutting tap, 107: end of inclined plane, 109: Cutting tap, 111: Cutting tap, 113: Cutting tap.

Claims

1. A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, In the case where the pilot hole for forming the female thread is a blind hole, A part of the tap groove functions as a chip intrusion prevention groove, the chip entry prevention groove is configured to function as a groove that releases chips into a pilot hole space, which is a space of the pilot hole expanding forward of the threaded portion, depending on the amount and / or force of the coolant supplied, and does not allow the chips to enter the groove, The tap grooves other than the chip entry prevention grooves function as chip discharge grooves that move within the grooves so that the coolant containing the chips discharged from the chip entry prevention grooves into the pilot hole space is discharged to the outside from a pilot hole opening that is an opening of the pilot hole, a chip discharge groove connecting coolant supply groove, which is a coolant supply groove that supplies coolant to the chip discharge groove among the coolant supply grooves, has a coolant supply form that cannot prevent coolant containing chips from entering the chip discharge groove and being discharged to the outside through the pilot hole opening, In the case where the pilot hole is a through hole, The coolant supplied from the chip discharge groove communicating coolant supply groove flows through the chip discharge groove, reaches the tip side of the threaded portion, and cools the tip side (excluding an embodiment in which a through coolant supply hole is provided in the form of a through hole extending from the rear end side of the shank to the tip side of the threaded portion, for supplying coolant from the rear end side of the shank and discharging it from the tip side of the threaded portion).

2. A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, A tap characterized in that the groove form of all or a part of the coolant supply groove is a non-through groove form in which the groove extends to a position approximately 1 / 3 or more of the tap groove in the range of the complete thread portion and has a groove end point (82), or a through groove form in which the groove does not pass through the tap groove and does not have the groove end point (82).

3. A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, The tap groove form includes a shallow tap groove portion that is a shallow groove form extending from the shank side toward the tip of the tap, and a deep tap groove portion that is a groove form deeper than the shallow tap groove portion and that is located on the tap tip side of the shallow tap groove portion and extends toward the tip of the tap, A tap characterized in that the shallow tap flute portion has a length extending to a position that is approximately 1 / 3 or more of the tap flutes in the range of the complete thread portion.

4. 4. The tap according to claim 3, wherein the coolant supply groove is formed in a penetrating manner in the shallow tap groove portion.

5. A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, a raised portion is provided over all or part of the axial direction of the tap groove, the raised portion extending from a bottom of the tap groove to the shank portion and extending toward the tap tip side in a form that fits within the range of the complete thread portion.

6. 6. The tap according to claim 5, wherein the raised portion is in the form in which the coolant supply groove is formed.

7. A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, In the whole or a part of the tap groove, a partition wall is provided at a height that does not contact the female thread formed in the pilot hole, and is connected to the shank portion and is formed in a form that fits within the range of the complete thread portion toward the tap tip side, The tap is characterized in that the tap groove 9d is divided into two grooves by the partition wall, thereby forming a back surface groove and a cutting surface groove.

8. 8. The tap according to claim 7, wherein the coolant supply groove is connected to the back surface groove or the cutting surface groove.

9. A tap body having a plurality of threaded portions each having a chamfer portion and a complete thread portion, and a shank portion connected to the threaded portions; a tap groove formed between adjacent threaded portions; A coolant supply groove is provided on the outer periphery of the shank portion for supplying coolant from a rear end side of the shank portion to all or some of the tap grooves, In the case where the pilot hole for forming the female thread is a blind hole, A part of the tap groove functions as a chip intrusion prevention groove, the chip entry prevention groove is connected to the coolant supply groove and functions as a groove that releases chips into a pilot hole space, which is a space of the pilot hole expanding forward of the threaded portion, depending on the amount and / or force of the coolant supplied, and does not allow the chips to enter the chip entry prevention groove; The tap grooves other than the chip entry prevention grooves function as chip discharge grooves that move within the grooves so that coolant containing chips discharged from the chip entry prevention grooves into the pilot hole space is discharged to the outside from a pilot hole opening that is an opening of the pilot hole, The tap is characterized in that the groove width of the chip entry prevention groove is narrower than the groove width of the chip discharge groove.

10. The tap according to claim 9, characterized in that in the chip entry prevention groove, the groove form of the coolant supply groove communicating with the chip entry prevention groove is a non-through groove form in which the groove extends to a position approximately 1 / 3 or more of the tap groove in the range of the complete thread portion and has a groove end point (82), or a through groove form in which the groove does not have the groove end point (82) and penetrates the tap groove.

11. The groove form of the chip intrusion prevention groove has a shallow tap groove portion which is a shallow groove form extending from the shank side toward the tip of the tap, and a deep tap groove portion which is a groove form deeper than the shallow tap groove portion and is located on the tap tip side than the shallow tap groove portion, The tap according to claim 9, characterized in that the coolant supply groove connected to the chip entry prevention groove has a shallow groove penetrating form that penetrates the shallow tap groove portion and is configured to release coolant to the deep tap groove portion.

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