Blade edge replaceable rotary cutting tool body and blade edge replaceable rotary cutting tool

Abstract

To provide a blade edge replaceable rotary cutting tool body which enables reduction of manufacturing costs and can stably fix a cutting insert with a cartridge member, and to provide a blade edge replaceable rotary cutting tool.SOLUTION: A blade edge replaceable rotary cutting tool body includes: a tool body 1 which rotates around a rotation axis; cartridge members 2 each of which is detachably attached to a cartridge attachment part 11 disposed at a tip outer periphery part of the tool body 1; and first screws 4. The cartridge member 2 includes: an insert attachment part 27 which has a form recessed from an upper surface 21 and to which a cutting insert 3 is detachably attached; and a cartridge side screw hole 28 which is open on a lower surface 22. The tool body 1 has holder side insertion holes 13 each of which is open at the cartridge attachment part 11 and faces the cartridge side screw hole 28. Each first screw 4 is inserted into the holder side insertion hole 13 and threadedly engaged with the cartridge side screw hole 28 to fix the cartridge member 2 to the cartridge attachment part 11.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an indexable rotary cutting tool body and an indexable rotary cutting tool. [Background technology]

[0002] BACKGROUND ART Conventionally, there is known an indexable rotary cutting tool that includes an indexable rotary cutting tool body that rotates around a rotation axis and a cutting insert that is removably attached to the outer periphery of the tip of the indexable rotary cutting tool body.

[0003] In this type of cutting tool, large-diameter tool bodies (holders) are more expensive than small-diameter holders, which poses a problem for tool users: when the tool body is damaged, it is necessary to replace the entire holder, which incurs significant costs. Furthermore, for manufacturers, large-diameter tool bodies often require the use of long end mills or other tools to machine the insert mounting seats, making it difficult to consistently ensure shape accuracy and positional accuracy during manufacturing.

[0004] Therefore, a method has been adopted in which the cutting insert is attached to the tool body via a wedge member or a cartridge member (supporter) (for example, Patent Documents 1 and 2). With this method, even if the cutting portion (cutting insert, etc.) is damaged, damage to the tool body is suppressed, thereby resolving the problem on the user's side. Also, by dividing the processing part into the tool body and the wedge member or cartridge member, the difficulty of processing during manufacturing can be reduced, thereby resolving the problem on the manufacturer's side.

[0005] Specifically, Patent Document 1 describes a face milling cutter in which a blade (cutting insert) is fixed to the face milling cutter body with a wedge and a screw, while Patent Document 2 describes a rotary tool in which a cutting insert is fixed to the rotary tool body via a seat member without using a wedge. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 8-118131 [Patent Document 2] Patent No. 4944192 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the face milling cutter described in Patent Document 1 requires multiple dedicated parts, such as multiple types of wedges and dedicated screws to secure the wedges, which increases the manufacturing cost of the dedicated parts.

[0008] Furthermore, in the rotary tool described in Patent Document 2, a plurality of through holes for inserting fixing screws are opened in the constraint seat surface (the surface that abuts against the insert lower surface) and the constraint side surface (the surface that abuts against the insert side surface) of the cutting insert formed on the seat member. These through holes are formed by cutting into the constraint surfaces such as the constraint seat surface and the constraint side surface (by cutting out a part of the constraint surface), thereby reducing the constraint area of ​​the cutting insert. As a result, the cutting insert cannot be stably fixed in machining with high cutting loads, such as high-feed machining.

[0009] An object of the present invention is to provide an indexable rotary cutting tool body and an indexable rotary cutting tool that can be manufactured at reduced cost and in which a cutting insert can be stably fixed by a cartridge member. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides the following means.

[0011] [Aspect 1 of the present invention] an indexable rotary cutting tool body comprising: a tool body that rotates about a rotation axis; a cartridge member that is detachably attached to a cartridge attachment portion that is arranged on the outer periphery of the tip of the tool body; and a first screw that fixes the cartridge member to the cartridge attachment portion, wherein the cartridge member has an upper surface that faces the direction of tool rotation around the rotation axis; a lower surface that faces the opposite side to the direction of tool rotation around the rotation axis; an insert attachment portion that is recessed from the upper surface and to which a cutting insert is detachably attached; and a cartridge-side screw hole that opens into the lower surface, wherein the tool body has a holder-side through-hole that opens into the cartridge attachment portion and is positioned opposite the cartridge-side screw hole, and the first screw is inserted into the holder-side through-hole and threadedly engaged with the cartridge-side screw hole, thereby fixing the cartridge member and the cartridge attachment portion together.

[0012] [Aspect 2 of the present invention] The cartridge member has a rear end surface facing the rear end side in the axial direction along which the rotation shaft extends, and an inner surface facing inward in a radial direction perpendicular to the rotation shaft, wherein the overall radial dimension of the cartridge member is width L, the overall axial dimension of the cartridge member is width M, and when the top surface of the cartridge member is viewed from the front, the center of the cartridge side screw hole is located at a position that is at least 1 / 2 of the width L from the inner surface toward the radially outward direction, and is located at a position that is at least 1 / 4 of the width M from the rear end surface toward the axially tip side.

[0013] [Embodiment 3 of the present invention] The insert mounting portion has a bottom surface that contacts the seating surface of the cutting insert, a pair of wall surfaces that contact the outer peripheral surface of the cutting insert, and a concave recessed portion disposed between the pair of wall surfaces, and when the top surface of the cartridge member is viewed from the front, the cartridge side screw hole and the recessed portion overlap.

[0014] [Aspect 4 of the present invention] 4. An indexable rotary cutting tool body according to any one of aspects 1 to 3, wherein the insert mounting portion has a bottom surface that contacts the seating surface of the cutting insert and a fixing screw hole that opens to the bottom surface and into which a fixing screw that fixes the cutting insert is threaded, the diameter dimension of the cartridge side screw hole is equal to or greater than the diameter dimension of the fixing screw hole, and the female thread of the cartridge side screw hole has 5 or more pitches.

[0015] [Embodiment 5 of the present invention] 5. The indexable rotary cutting tool body of any one of aspects 1 to 4, further comprising: a second screw that fixes the cartridge member to the cartridge mounting portion from a direction different from the first screw; the cartridge member having a front end surface facing the front end in the axial direction in which the rotation shaft extends, a rear end surface facing the rear end in the axial direction, and a cartridge side insertion hole that opens to the front end surface and the rear end surface; the tool body having a holder side screw hole that opens to the cartridge mounting portion and is positioned opposite the cartridge side insertion hole; and the second screw is inserted into the cartridge side insertion hole and threaded into the holder side screw hole, thereby fixing the cartridge member and the cartridge mounting portion.

[0016] [Aspect 6 of the present invention] The indexable rotary cutting tool body according to any one of aspects 1 to 5, wherein the first screw has a screw shaft that is threaded into the cartridge-side screw hole and a screw head having an outer diameter dimension larger than that of the screw shaft, and the holder-side insertion hole has an inner diameter dimension smaller than that of the screw head and has an insertion hole portion into which the screw shaft is inserted and an accommodating hole portion having an inner diameter dimension larger than that of the screw head.

[0017] [Embodiment 7 of the present invention] A replaceable cutting tool comprising: the replaceable cutting tool body according to any one of aspects 1 to 6; and the cutting insert removably attached to the insert attachment portion of the cartridge member. [Effects of the Invention]

[0018] According to the above aspects of the present invention, an indexable rotary cutting tool body and an indexable rotary cutting tool are provided that can reduce manufacturing costs and allow a cutting insert to be stably fixed by a cartridge member. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing an indexable rotary cutting tool according to one embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a part of the indexable rotary cutting tool, showing a state in which a cartridge member is attached to a cartridge attachment portion and a state in which it is not attached. [Figure 3] FIG. 3 is an exploded perspective view showing a part of the indexable rotary cutting tool. [Figure 4] FIG. 4 is an exploded perspective view showing a part of the indexable rotary cutting tool. [Figure 5] FIG. 5 is a perspective view showing a part of an indexable rotary cutting tool. [Figure 6] FIG. 6 is a perspective view showing the cartridge member. [Figure 7] FIG. 7 is a perspective view showing the cartridge member. [Figure 8] FIG. 8 is a top view of the top surface of the cartridge member as seen from the front. [Figure 9] FIG. 9 is a front view of the tip end surface of the cartridge member. [Figure 10] FIG. 10 is a side view of the outer surface of the cartridge member as seen from the front. [Figure 11] FIG. 11 is a bottom view of the lower surface of the cartridge member as seen from the front. DETAILED DESCRIPTION OF THE INVENTION

[0020] An indexable rotary cutting tool body 10 and an indexable rotary cutting tool 20 according to one embodiment of the present invention will be described with reference to the drawings. The indexable rotary cutting tool 20 of this embodiment is, for example, an indexable milling cutter or an indexable radius end mill, and is a milling tool (milling tool) particularly suited to high-feed machining. In this embodiment, the indexable rotary cutting tool body 10 and the indexable rotary cutting tool 20 may be simply referred to as tools or cutting tools.

[0021] 1 to 5, indexable rotary cutting tool 20 includes indexable rotary cutting tool body 10 centered on rotation axis O, and cutting insert 3. Indexable rotary cutting tool body 10 also includes tool body 1 that rotates about rotation axis O, cartridge member 2 that is detachably attached to cartridge attachment portion 11 of tool body 1, first screw 4, second screw 5, and fixing screw 6.

[0022] In this embodiment, the direction in which the rotation axis O, which is the central axis of the tool, extends, i.e., the direction along the rotation axis O, is referred to as the axial direction. The cartridge mounting portion 11 is disposed at the first end of the axial ends (first end and second end) of the tool body 1. In this embodiment, the axial direction from the first end where the cartridge mounting portion 11 is disposed to the second end is referred to as the rear end side of the axial direction or simply the rear end side. Furthermore, the axial direction from the second end to the first end is referred to as the front end side of the axial direction or simply the front end side.

[0023] The direction perpendicular to the rotation axis O is called the radial direction. Within the radial direction, the direction approaching the rotation axis O is called the radially inner direction, and the direction away from the rotation axis O is called the radially outer direction. The direction of rotation around the rotation axis O is called the circumferential direction. Of the circumferential directions, the direction in which the tool is rotated during cutting is called the tool rotation direction T, and the opposite rotation direction is called the opposite side of the tool rotation direction T or the counter-tool rotation direction.

[0024] The cutting insert 3 is formed of a hard sintered body, for example, made of cemented carbide. The cutting insert 3 has a polygonal plate shape, and in this embodiment, a quadrangular plate shape. A plurality of cutting inserts 3 are provided in the indexable rotary cutting tool 20. The plurality of cutting inserts 3 are arranged at intervals from one another in the circumferential direction on the outer periphery of the tip of the tool.

[0025] The cutting insert 3 has an insert upper surface 31 facing the tool rotation direction T, an insert lower surface 32 facing the opposite tool rotation direction, an outer peripheral surface 33 connecting the insert upper surface 31 and the insert lower surface 32, a cutting edge 34 arranged on the ridge portion where the insert upper surface 31 and the outer peripheral surface 33 are connected, and a fixing screw insertion hole 35 penetrating the cutting insert 3 in the plate thickness direction.

[0026] The insert upper surface 31 has a polygonal surface shape, and in this embodiment, a quadrangular surface shape. The insert upper surface 31 may also be referred to as a rake face 31. The insert lower surface 32 is flat. The insert lower surface 32 may also be referred to as a seating surface 32.

[0027] The outer peripheral surface 33 has a plurality of side surfaces and a plurality of corners. The side surfaces and the corners are arranged alternately along the direction in which the outer peripheral surface 33 extends (the circumferential direction of the insert). In this embodiment, the outer peripheral surface 33 has four side surfaces and four corners.

[0028] The cutting edges 34 are substantially L-shaped and are arranged at the corners of the rake face 31. In this embodiment, four cutting edges 34 are provided on the cutting insert 3. Each cutting edge 34 has a convex curved edge and a pair of straight edges connected to both ends of the convex curved edge. When the tool is in use, a predetermined cutting edge 34 arranged on the outer periphery of the tip of the tool is used for cutting.

[0029] The fixing screw insertion hole 35 extends in the plate thickness direction (insert axial direction) of the cutting insert 3 along the central axis (insert central axis) of the cutting insert 3. The fixing screw insertion hole 35 is a multi-stage circular hole that opens to the insert upper surface 31 and the insert lower surface 32. The fixing screw insertion hole 35 has an upper surface opening that opens to the insert upper surface 31 and a lower surface opening that opens to the insert lower surface 32. The inner diameter dimension of the upper surface opening of the fixing screw insertion hole 35 is larger than the inner diameter dimension of the lower surface opening.

[0030] The tool body 1 may be made of an alloy steel for machine structures, such as SCM440. The tool body 1 has a generally columnar or cylindrical shape centered on a rotation axis O. The rear end of the tool body 1 is detachably attached to a spindle of a machine tool (not shown). The indexable rotary cutting tool 20 is rotated in a tool rotation direction T by the spindle of the machine tool while being moved in radial and axial directions, thereby cutting a workpiece such as a metal.

[0031] The tool body 1 has a cartridge mounting portion 11, a chip pocket 12, a cartridge support portion 15, a holder-side insertion hole 13, and a holder-side screw hole 14.

[0032] The cartridge mounting portion 11 is disposed on the outer periphery of the tip of the tool body 1. The cartridge mounting portion 11 is groove-shaped, recessed from the tip surface of the tool body 1 toward the rear end, and extends radially. The radial outer end of the cartridge mounting portion 11 opens to the outer periphery of the tool body 1. The tool body 1 is provided with a plurality of cartridge mounting portions 11. The plurality of cartridge mounting portions 11 are disposed on the outer periphery of the tip of the tool body 1 at intervals from one another in the circumferential direction.

[0033] The cartridge mounting portion 11 has a first wall surface 11a, a second wall surface 11b, a third wall surface 11c, and a fourth wall surface 11d. The first wall surface 11a is disposed at an end portion of the cartridge mounting portion 11 in the direction opposite to the tool rotation direction. The first wall surface 11a has a flat surface facing the tool rotation direction T.

[0034] The second wall surface 11b is disposed at the rear end in the axial direction of the cartridge mounting portion 11. The second wall surface 11b has a flat surface facing the front end in the axial direction. The end of the second wall surface 11b in the counter-tool rotation direction is connected to the rear end in the axial direction of the first wall surface 11a.

[0035] The third wall surface 11c is disposed at the radially inner end of the cartridge mounting portion 11. The third wall surface 11c has a flat surface facing radially outward. An axial rear end of the third wall surface 11c is connected to the radially inner end of the second wall surface 11b.

[0036] The fourth wall surface 11d is disposed at the end of the cartridge mounting portion 11 in the tool rotation direction T. The fourth wall surface 11d has a flat surface facing the opposite tool rotation direction. An axial rear end of the fourth wall surface 11d is connected to an end of the second wall surface 11b in the tool rotation direction T. A radially outer end of the fourth wall surface 11d is located radially inward of the radially outer end of the first wall surface 11a. The fourth wall surface 11d may be angled with respect to the opposite tool rotation direction, and may be formed not only by a single flat surface but also by multiple flat surfaces or curved surfaces.

[0037] The chip pocket 12 is arranged on the outer periphery of the tip of the tool body 1. The chip pocket 12 is recessed from the tip surface and outer periphery of the tool body 1. The chip pocket 12 is arranged adjacent to the cartridge mounting portion 11 in the tool rotation direction T of the cartridge mounting portion 11. A plurality of chip pockets 12 are provided on the tool body 1. The plurality of chip pockets 12 are arranged on the outer periphery of the tip of the tool body 1 at intervals from one another in the circumferential direction.

[0038] The cartridge support part 15 is disposed on the outer periphery of the tip of the tool body 1. The cartridge support part 15 is disposed between the chip pocket 12 and the cartridge attachment part 11 adjacent to the chip pocket 12 in the tool rotation direction T. The cartridge support part 15 is sandwiched between the chip pocket 12 and the cartridge attachment part 11 in the circumferential direction of the tool, and is formed so as to protrude toward the outer periphery of the tip.

[0039] The cartridge support portion 15 functions as a back metal for the cartridge member 2 attached to the cartridge mounting portion 11. The cartridge support portion 15 supports the cartridge member 2 from the direction opposite to the tool rotation direction. A plurality of cartridge support portions 15 are provided on the tool body 1. The plurality of cartridge support portions 15 are arranged on the outer periphery of the tip of the tool body 1 at intervals from one another in the circumferential direction.

[0040] The holder-side through-hole 13 extends linearly through the cartridge support portion 15. The holder-side through-hole 13 extends substantially in the circumferential direction. The holder-side through-hole 13 has a multi-stage circular hole shape.

[0041] The holder-side through-hole 13 is open to a surface of the cartridge support portion 15 facing the tool rotation direction T (surface facing the cartridge mounting portion 11) and a surface of the cartridge support portion 15 facing the counter-tool rotation direction (surface facing the chip pocket 12). In other words, the holder-side through-hole 13 is open to a first wall surface 11a of the cartridge mounting portion 11 and a surface of the chip pocket 12 facing the counter-tool rotation direction. That is, the holder-side through-hole 13 is open to the cartridge mounting portion 11 and the chip pocket 12. In this embodiment, the holder-side through-hole 13 extends in a direction perpendicular to the first wall surface 11a of the cartridge mounting portion 11.

[0042] A plurality of holder-side through-holes 13 are provided in the tool body 1. The holder-side through-holes 13 are arranged at intervals from one another in the circumferential direction on the outer periphery of the tip of the tool body 1. Each holder-side through-hole 13 is arranged in each cartridge support portion 15.

[0043] The holder side insertion hole 13 has a holder side insertion hole portion (insertion hole portion) 13a and a holder side accommodating hole portion (accommodating hole portion) 13b arranged in the counter-tool rotation direction of the holder side insertion hole portion 13a and connected to the holder side insertion hole portion 13a.

[0044] The holder-side insertion hole 13a has a circular hole shape and is disposed at least at the end of the holder-side insertion hole 13 in the tool rotation direction T. The holder-side insertion hole 13a opens to the first wall surface 11a of the cartridge attachment portion 11.

[0045] The holder-side accommodating hole 13b is a circular hole and is disposed at least at the end of the holder-side insertion hole 13 in the counter-tool rotation direction. The holder-side accommodating hole 13b opens to the surface of the chip pocket 12 facing the counter-tool rotation direction. The inner diameter of the holder-side accommodating hole 13b is larger than the inner diameter of the holder-side insertion hole 13a.

[0046] The holder-side screw hole 14 opens to the second wall surface 11b of the cartridge mounting portion 11 and extends in the axial direction. That is, the holder-side screw hole 14 opens to the cartridge mounting portion 11. The holder-side screw hole 14 is circular and has a female thread on its inner peripheral surface. A plurality of holder-side screw holes 14 are provided in the tool body 1. The plurality of holder-side screw holes 14 are arranged at intervals from one another in the circumferential direction on the outer periphery of the tip of the tool body 1.

[0047] The cartridge member 2 may be made of alloy tool steel, such as SKD61. The cartridge member 2 may also be made of SCM or SK3. The cartridge member 2 has a generally polygonal plate shape or a generally polygonal column shape. In this embodiment, the cartridge member 2 has a generally rectangular plate shape or a generally rectangular parallelepiped shape.

[0048] The cartridge member 2 has an upper surface 21 facing the tool rotation direction T, a lower surface 22 facing the opposite side to the tool rotation direction T, a front end surface 23 facing the front end side in the axial direction, a rear end surface 24 facing the rear end side in the axial direction, an inner surface 25 facing radially inward, and an outer surface 26 facing radially outward.

[0049] Of the outer surfaces of the cartridge member 2, at least the lower surface 22, rear end surface 24, and inner surface 25 are flat. The lower surface 22 of the cartridge member 2 contacts the first wall surface 11a of the cartridge mounting portion 11. The rear end surface 24 of the cartridge member 2 contacts the second wall surface 11b of the cartridge mounting portion 11. The inner surface 25 of the cartridge member 2 contacts the third wall surface 11c of the cartridge mounting portion 11.

[0050] Of the outer surfaces of the cartridge member 2, the upper surface 21 faces the fourth wall surface 11d of the cartridge mounting portion 11 with a gap therebetween. Note that at least a portion of the upper surface 21 may be in contact with the fourth wall surface 11d. Of the outer surfaces of the cartridge member 2, the upper surface 21, the tip surface 23, and the outer surface 26 may be formed by a single flat surface, may be formed by a combination of multiple flat surfaces, or may be curved, etc.

[0051] In the following description, the direction connecting the upper surface 21 and the lower surface 22 of the cartridge member 2 may be referred to as the vertical direction. The vertical direction is the direction in which an imaginary line perpendicular to at least the lower surface 22 extends, and roughly corresponds to the circumferential direction of the tool. Note that the vertical direction can also be referred to as the direction in which a tangent passing through a part of the circumference of an imaginary circle centered on the rotation axis O extends. In addition, in the up-down direction, the direction from the lower surface 22 to the upper surface 21 may be referred to as the upper side, and the direction from the upper surface 21 to the lower surface 22 may be referred to as the lower side.

[0052] As shown in FIGS. 6 to 11, the cartridge member 2 further has an insert mounting portion 27, a cartridge side screw hole 28, a cartridge side insertion hole 29, a lower surface recess 71, and a rear end surface recess 72.

[0053] The insert mounting portion 27 has a recessed shape recessed from the upper surface 21. The cutting insert 3 is removably mounted to the insert mounting portion 27. The insert mounting portion 27 has a recessed shape corresponding to the outer shape of the cutting insert 3, and in this embodiment, has a rectangular recessed shape.

[0054] The insert mounting portion 27 is disposed at the upper end (corresponding to the tool rotation direction T) of the cartridge member 2. The insert mounting portion 27 is also disposed at the tip end (end on the tip surface 23 side) and radially outer end (end on the outer surface 26 side) of the cartridge member 2. In other words, the insert mounting portion 27 is disposed on the outer periphery of the tip end of the tool. The insert mounting portion 27 has a notch shape that opens to the upper surface 21, the tip surface 23, and the outer surface 26.

[0055] The insert attachment portion 27 has a bottom surface 27a, a pair of wall surfaces 27b and 27c, a recessed portion 27d, and a fixing screw hole 27e. The bottom surface 27a is flat and faces upward (in the tool rotation direction T). The bottom surface 27a contacts the seating surface (insert lower surface) 32 of the cutting insert 3 (see FIGS. 2 and 3, etc.).

[0056] The pair of wall surfaces 27b, 27c contact the outer peripheral surface 33 of the cutting insert 3. Of the pair of wall surfaces 27b, 27c, one wall surface 27b is flat and faces the leading end side. The one wall surface 27b contacts a side surface of the outer peripheral surface 33 of the cutting insert 3 that faces the rear end side. Of the pair of wall surfaces 27b, 27c, the other wall surface 27c is flat and faces radially outward. The other wall surface 27c contacts a side surface of the outer peripheral surface 33 of the cutting insert 3 that faces radially inward.

[0057] The recess 27d is disposed between a pair of wall surfaces 27b, 27c and has a concave shape. The recess 27d is recessed toward the rear end side of one wall surface 27b and is recessed radially inward of the other wall surface 27c. The recess 27d has a groove shape extending in the vertical direction. One corner of the outer peripheral surface 33 of the cutting insert 3 is disposed in the recess 27d. The recess 27d and the cutting insert 3 are not in contact with each other.

[0058] The fixing screw hole 27e opens in the bottom surface 27a and extends in the vertical direction. The fixing screw hole 27e is a circular hole with a female thread on its inner circumferential surface. In this embodiment, the fixing screw hole 27e penetrates the cartridge member 2 in the vertical direction and also opens in the lower surface 22.

[0059] The cartridge-side screw hole 28 opens to the lower surface 22. In this embodiment, the cartridge-side screw hole 28 extends in a direction perpendicular to the lower surface 22 (i.e., in the up-down direction). The cartridge-side screw hole 28 is a circular hole having a female thread on its inner circumferential surface. In this embodiment, the cartridge-side screw hole 28 penetrates the cartridge member 2 in the up-down direction and also opens to the insert mounting portion 27. Specifically, the upper end of the cartridge-side screw hole 28 opens to the recessed portion 27d.

[0060] The diameter of the cartridge-side screw hole 28 is equal to or greater than the diameter of the fixing screw hole 27e. The female thread of the cartridge-side screw hole 28 has 5 or more pitches. As shown in FIG. 5, when the cartridge member 2 is attached to the cartridge attachment portion 11, the holder-side insertion hole 13 of the tool body 1 is disposed opposite to the cartridge-side screw hole .

[0061] 8, the cartridge-side screw hole 28 and the recessed portion 27d are arranged to overlap in a top view in which the upper surface 21 of the cartridge member 2 is viewed from the front. More specifically, in this top view, the recessed portion 27d is arc-shaped, and the center of the arc of the recessed portion 27d and the center C of the cartridge-side screw hole 28 are arranged to be coaxial (to coincide with each other).

[0062] Furthermore, when the overall radial dimension of the cartridge member 2 is width L and the overall axial dimension of the cartridge member 2 is width M, when the top surface 21 of the cartridge member 2 is viewed from the front, the center C of the cartridge side screw hole 28 is located at a position that is more than 1 / 2 of the width L from the inner surface 25 toward the radially outward side, and is located at a position that is more than 1 / 4 of the width M from the rear end surface 24 toward the axial tip side.

[0063] More specifically, when viewing the top surface 21 of the cartridge member 2 from the front, the center C of the cartridge side screw hole 28 is preferably in the range of 1 / 2 to 3 / 4 of the width L from the inner surface 25 toward the radially outward direction, and is preferably in the range of 1 / 4 to 3 / 4 of the width M from the rear end surface 24 toward the axial tip side.

[0064] 6, 7, and 9, the cartridge-side through-hole 29 extends linearly through the cartridge member 2. Specifically, the cartridge-side through-hole 29 extends in the axial direction and opens to the front end face 23 and the rear end face 24. The cartridge-side through-hole 29 is disposed radially inward of the insert mounting portion 27. The cartridge-side through-hole 29 has a multi-stage circular hole shape.

[0065] The cartridge-side insertion hole 29 has a cartridge-side insertion hole portion 29a and a cartridge-side accommodating hole portion 29b that is disposed on the axial tip side of the cartridge-side insertion hole portion 29a and is connected to the cartridge-side insertion hole portion 29a.

[0066] The cartridge-side insertion hole 29a has a circular hole shape and is disposed at least at the rear end of the cartridge-side insertion hole 29. The cartridge-side insertion hole 29a opens to the rear end surface 24 of the cartridge member 2.

[0067] The cartridge-side accommodating hole 29b has a circular hole shape and is disposed at least at the tip of the cartridge-side insertion hole 29. The cartridge-side accommodating hole 29b opens to the tip surface 23 of the cartridge member 2. The inner diameter of the cartridge-side accommodating hole 29b is larger than the inner diameter of the cartridge-side insertion hole 29a.

[0068] With the cartridge member 2 attached to the cartridge attachment portion 11, the holder-side screw hole 14 of the tool body 1 is disposed opposite the cartridge-side insertion hole 29 (see FIG. 4).

[0069] As shown in Figures 7 and 11, the lower surface recess 71 is recessed from the lower surface 22 of the cartridge member 2 and extends in the axial direction. The lower surface recess 71 is groove-shaped and is disposed on the lower surface 22 over the entire axial length. The lower surface recess 71 is disposed in an intermediate portion of the lower surface 22 located between both radial end portions (between the radial inner end portion and the radial outer end portion). The lower surface recess 71 is provided so as to divide the lower surface 22 into the radial inner end portion and the radial outer end portion. In this embodiment, the lower end opening of the cartridge-side screw hole 28 opens in the lower surface recess 71.

[0070] The rear end surface recess 72 is recessed from the rear end surface 24 of the cartridge member 2 and extends in the vertical direction. The rear end surface recess 72 is groove-shaped and is disposed over the entire length of the rear end surface 24 in the vertical direction. The rear end surface recess 72 is disposed in an intermediate portion of the rear end surface 24 between both radial end portions (between the radial inner end portion and the radial outer end portion). The rear end surface recess 72 is provided so as to divide the rear end surface 24 into the radial inner end portion and the radial outer end portion. In this embodiment, at least a portion of the rear end opening portion (cartridge-side insertion hole portion 29a) of the cartridge-side insertion hole 29 opens into the rear end surface recess 72.

[0071] As shown in FIGS. 3 to 5 , the first screw 4 is a commercially available screw or the like that is distributed as a general-purpose part. The first screw 4 has a multi-step cylindrical shape and extends in the vertical direction (corresponding to the circumferential direction of the tool). The first screw 4 is inserted upward (corresponding to the tool rotation direction T) into the holder-side insertion hole 13 and threaded into the cartridge-side screw hole 28, thereby fixing the cartridge member 2 and the cartridge mounting portion 11 together. The first screw 4 detachably fixes the cartridge member 2 to the cartridge mounting portion 11.

[0072] The first screw 4 has a cylindrical first screw shaft (screw shaft) 4a that is screwed into the cartridge-side screw hole 28, and a columnar first screw head (screw head) 4b that has an outer diameter dimension larger than that of the first screw shaft 4a. The first screw shaft 4a has a male thread on its outer peripheral surface. The first screw head 4b has a locking portion to which a work tool such as a wrench (not shown) is locked. In this embodiment, the locking portion is recessed from the end face (lower end face) of the first screw head 4b that faces away from the first screw shaft 4a.

[0073] The inner diameter of the holder-side insertion hole 13a of the tool body 1 is smaller than the outer diameter of the first screw head 4b. The first screw shaft 4a is inserted into the holder-side insertion hole 13a. The inner diameter of the holder-side accommodating hole 13b is larger than the outer diameter of the first screw head 4b. In this embodiment, the vertical dimension of the holder-side accommodating hole 13b (circumferential direction of the tool) is equal to or larger than the vertical dimension of the first screw head 4b. Therefore, the entire first screw head 4b is accommodated within the holder-side accommodating hole 13b.

[0074] The second screw 5 may be a commercially available screw or the like that is distributed as a general-purpose part. The second screw 5 has a multi-step cylindrical shape and extends in the axial direction. The second screw 5 is inserted into the cartridge-side insertion hole 29 toward the rear end side in the axial direction and threadedly engaged with the holder-side threaded hole 14, thereby fixing the cartridge member 2 and the cartridge mounting portion 11. The second screw 5 detachably fixes the cartridge member 2 to the cartridge mounting portion 11 from a direction different from that of the first screw 4.

[0075] The second screw 5 has a cylindrical second screw shaft 5a that is threaded into the holder-side screw hole 14, and a columnar second screw head 5b that has an outer diameter larger than that of the second screw shaft 5a. The second screw shaft 5a has a male thread on its outer circumferential surface. The second screw head 5b has a locking portion to which a work tool such as a wrench (not shown) is locked. In this embodiment, the locking portion is recessed from the end face (tip face) of the second screw head 5b facing away from the second screw shaft 5a. The second screw head 5b may also be tapered to add eccentricity when screwed.

[0076] The inner diameter of the cartridge-side insertion hole 29a of the cartridge member 2 is smaller than the outer diameter of the second screw head 5b. The second screw shaft 5a is inserted into the cartridge-side insertion hole 29a. The inner diameter of the cartridge-side accommodating hole 29b is larger than the outer diameter of the second screw head 5b. In this embodiment, the axial dimension of the cartridge-side accommodating hole 29b is equal to or greater than the axial dimension of the second screw head 5b. Therefore, the entire second screw head 5b is accommodated within the cartridge-side accommodating hole 29b.

[0077] The fixing screw 6 may be a commercially available screw or the like that is distributed as a general-purpose part. The fixing screw 6 has a multi-step cylindrical shape and extends in the vertical direction (corresponding to the circumferential direction of the tool). The fixing screw 6 is inserted downward (corresponding to the counter-rotation direction of the tool) into the fixing screw insertion hole 35 and threaded into the fixing screw hole 27e, thereby fixing the cutting insert 3 and the insert mounting portion 27. The fixing screw 6 detachably fixes the cutting insert 3 to the insert mounting portion 27. In other words, the cutting insert 3 can be fixed to the cartridge member 2 by threading the fixing screw 6 into the fixing screw hole 27e.

[0078] The fixing screw 6 has a cylindrical fixing screw shaft 6a that is threaded into the fixing screw hole 27e, and a columnar fixing screw head 6b that has an outer diameter larger than that of the fixing screw shaft 6a. The fixing screw shaft 6a has a male thread on its outer circumferential surface. The fixing screw head 6b has a locking portion to which a work tool such as a wrench (not shown) is locked. In this embodiment, the locking portion is recessed from the end face (upper end face) of the fixing screw head 6b facing away from the fixing screw shaft 6a. The fixing screw head 6b may also be tapered to add eccentricity when screwed.

[0079] Of the fixing screw insertion holes 35 of the cutting insert 3, the inner diameter dimension of the lower surface opening that opens to the insert lower surface 32 is smaller than the outer diameter dimension of the fixing screw head 6b. The fixing screw shank 6a is inserted into the lower surface opening of the fixing screw insertion hole 35. Furthermore, of the fixing screw insertion holes 35, the inner diameter dimension of the upper surface opening that opens to the insert upper surface 31 is larger than the outer diameter dimension of the fixing screw head 6b. In this embodiment, the vertical dimension (circumferential direction of the tool) of the upper surface opening of the fixing screw insertion hole 35 is equal to or larger than the vertical dimension of the fixing screw head 6b. Therefore, the entire fixing screw head 6b is accommodated within the upper surface opening of the fixing screw insertion hole 35.

[0080] According to the indexable rotary cutting tool body 10 and indexable rotary cutting tool 20 of the present embodiment described above, it is possible to fix the cartridge member 2 to the cartridge attachment portion 11 using a general-purpose part such as a commercially available screw as the first screw 4, without using dedicated parts such as a wedge member or dedicated screw to fix the cartridge member 2. As a result, there is no need to manufacture dedicated parts, and the manufacturing cost of the tool can be reduced.

[0081] Specifically, the cartridge member 2 is fixed to the cartridge mounting portion 11 by inserting the first screw 4 into the holder-side through-hole 13 of the tool body 1 and threading it into the cartridge-side screw hole 28 opening in the underside 22 of the cartridge member 2. With this configuration, in this embodiment, it is possible to accommodate the screw head (first screw head) 4b of the first screw 4 within the holder-side through-hole 13. For example, unlike Patent Document 2 (Japanese Patent No. 4944192), it is not necessary to cut out a space to accommodate the screw head in the insert mounting portion (constraint surface such as the constraint seat surface or the constraint side surface). Therefore, according to this embodiment, a wide constraint area for the cutting insert 3 can be ensured. Furthermore, since the thickness of the cartridge member 2 can be maintained, the strength of the cartridge member 2 can be ensured.

[0082] Furthermore, by providing the accommodation space for the screw head 4b in the tool body 1 (holder-side insertion hole 13) rather than in the cartridge member 2, it becomes possible to use a large-diameter screw as the first screw 4. This allows for high adhesion between the cartridge member 2 and the cartridge attachment part 11 due to the large axial force (fixing force) of the large-diameter screw.

[0083] As described above, this embodiment employs a structure in which the cartridge member 2 is retracted and fixed from the underside 22 side of the cartridge member 2 by the first screw 4. According to this embodiment, manufacturing costs can be reduced, and the cutting insert 3 can be stably fixed by the cartridge member 2 even in an environment of high cutting load. Furthermore, since there is ample space around the insert mounting portion 27, design freedom for the insert mounting portion 27 can be ensured.

[0084] In this embodiment, the overall radial dimension of the cartridge member 2 is width L, and the overall axial dimension of the cartridge member 2 is width M. When viewing the top surface 21 of the cartridge member 2 from the front, the center C of the cartridge side screw hole 28 is located at a position that is more than 1 / 2 of the width L from the inner surface 25 toward the radially outward side, and is located at a position that is more than 1 / 4 of the width M from the rear end surface 24 toward the axial tip side.

[0085] In a top view in which the upper surface 21 of the cartridge member 2 is seen from the front, the insert mounting portion 27 to which the cutting insert 3 is attached is disposed on the outer periphery of the leading end of the cartridge member 2. Specifically, the insert mounting portion 27 is disposed at a position that is at least half of the width L from the inner surface 25 of the cartridge member 2 toward the outside in the radial direction, and at a position that is at least one-quarter of the width M from the rear end surface 24 toward the leading end in the axial direction.

[0086] According to the above-described configuration of this embodiment, the cartridge-side screw hole 28 is disposed near the insert mounting portion 27, which is susceptible to cutting loads, and therefore the cartridge member 2 can be more stably fixed by the first screw 4 that is threaded into the cartridge-side screw hole 28. In other words, the cartridge member 2 can be pulled in from an appropriate position by the first screw 4, thereby obtaining close contact between the cartridge member 2 and the cartridge mounting portion 11.

[0087] In addition, in this embodiment, the insert mounting portion 27 has a bottom surface 27a that contacts the seating surface (insert lower surface) 32 of the cutting insert 3, a pair of wall surfaces 27b, 27c that contact the outer peripheral surface 33 of the cutting insert 3, and a concave recessed portion 27d arranged between the pair of wall surfaces 27b, 27c, and when the upper surface 21 of the cartridge member 2 is viewed from the front, the cartridge side screw hole 28 and the recessed portion 27d overlap.

[0088] The recessed portion 27d of the insert mounting portion 27 is disposed at a position that is approximately diagonal to the cutting insert 3 (a position that is diagonal to the rake face (insert upper surface) 31) with respect to the cutting edge 34 used in the cutting insert 3 attached to this insert mounting portion 27. According to the above configuration of this embodiment, the cartridge-side screw hole 28 is disposed at a position that is diagonal to the cutting edge 34 that receives the cutting load (the same position as the recessed portion 27d in top view), so that the cartridge member 2 can be fixed more stably by the first screw 4.

[0089] In this embodiment, the diameter of the cartridge-side screw hole 28 is equal to or greater than the diameter of the fixing screw hole 27e, and the female thread of the cartridge-side screw hole 28 has 5 or more pitches. In this case, a large-diameter screw can be used as the first screw 4 that is screwed into the cartridge-side screw hole 28. Also, it is possible to ensure a sufficient number of threads (the number of meshing female threads and male threads) that thread the cartridge-side screw hole 28 and the first screw 4. This makes the above-described effects of this embodiment even more remarkable.

[0090] In this embodiment, a second screw 5 is provided to fix the cartridge member 2 to the cartridge mounting portion 11 from a direction different from that of the first screw 4. Specifically, the second screw 5 is inserted into the cartridge-side insertion hole 29 and threaded into the holder-side screw hole 14, thereby fixing the cartridge member 2 and the cartridge mounting portion 11 together.

[0091] In this case, the second screw 5 can fix the cartridge member 2 to the cartridge mounting portion 11 from a direction different from that of the first screw 4. More specifically, the first screw 4 can fix the cartridge member 2 and the cartridge mounting portion 11 from the circumferential direction around the rotation axis O, and the second screw 5 can fix the cartridge member 2 and the cartridge mounting portion 11 from the axial direction. The first screw 4 and the second screw 5 can stably fix the cartridge member 2 from two different directions.

[0092] In this embodiment, the first screw 4 has a first screw shaft (screw shaft) 4a that is screwed into the cartridge side screw hole 28 and a first screw head (screw head) 4b that has an outer diameter dimension larger than that of the first screw shaft 4a, and the holder side insertion hole 13 has a holder side insertion hole portion (insertion hole portion) 13a that has an inner diameter dimension smaller than that of the first screw head 4b and into which the first screw shaft 4a is inserted, and a holder side accommodating hole portion (accommodating hole portion) 13b that has an inner diameter dimension larger than that of the first screw head 4b.

[0093] In this case, the screw head 4b of the first screw 4 can be accommodated in the accommodation hole portion 13b of the holder-side insertion hole 13. According to this embodiment, it is not necessary to provide an accommodation space for the screw head 4b in the insert mounting portion 27 on the cartridge member 2 side. By providing an accommodation space for the screw head 4b on the tool body 1 side, it becomes possible to use a large-diameter screw as the first screw 4. The cartridge member 2 can be firmly fixed by the first screw 4.

[0094] In this embodiment, the cartridge member 2 has a lower surface recess 71 extending from the lower surface 22 in the recess axial direction, and the lower surface recess 71 is disposed over the entire axial length of the lower surface 22. The cartridge member 2 also has a rear end surface recess 72 recessed from the rear end surface 24 and extending in the vertical direction, and the rear end surface recess 72 is disposed over the entire vertical length of the rear end surface 24.

[0095] In this case, because the lower surface recess 71 is provided on the lower surface 22 of the cartridge member 2, the lower surface 22 is stably supported at two points on both radial sides of the lower surface recess 71 against the first wall surface 11a of the cartridge mounting portion 11. In addition, because the rear end surface recess 72 is provided on the rear end surface 24 of the cartridge member 2, the rear end surface 24 is stably supported at two points on both radial sides of the rear end surface recess 72 against the second wall surface 11b of the cartridge mounting portion 11. Therefore, the cartridge member 2 is fixed to the cartridge mounting portion 11 more firmly and stably.

[0096] The present invention is not limited to the above-described embodiment, and modifications to the configuration are possible within the scope of the invention, as described below.

[0097] In the above-described embodiment, the extending direction of the cartridge-side screw hole 28 is not limited to the direction perpendicular to the lower surface 22 of the cartridge member 2, but may be inclined relative to the direction perpendicular to the lower surface 22. Furthermore, the extending direction of the holder-side through-hole 13 is not limited to the direction perpendicular to the first wall surface 11a of the cartridge mounting portion 11, but may be inclined relative to the direction perpendicular to the first wall surface 11a.

[0098] In the above-described embodiment, the extending direction of the cartridge-side insertion hole 29 is not limited to a direction perpendicular to the rear end surface 24 of the cartridge member 2 (i.e., the axial direction), but may be inclined relative to the direction perpendicular to the rear end surface 24. Furthermore, the extending direction of the holder-side screw hole 14 is not limited to a direction perpendicular to the second wall surface 11b of the cartridge mounting portion 11, but may be inclined relative to the direction perpendicular to the second wall surface 11b.

[0099] In the above-described embodiment, there may be provided a plurality of sets of cartridge-side screw holes 28, holder-side insertion holes 13, and first screws 4. This makes it possible to further increase the restraining force (fixing force) of the cartridge member 2 to the cartridge mounting portion 11.

[0100] In the above-described embodiment, the fixing screw hole 27e of the insert mounting portion 27 is a through hole that passes through the cartridge member 2 in the vertical direction, but is not limited to this. The fixing screw hole 27e may be a stop hole that opens to the bottom surface 27a but does not open to the lower surface 22.

[0101] In the above-described embodiment, the cartridge-side screw hole 28 is a through-hole that passes through the cartridge member 2 in the vertical direction, but is not limited to this. The cartridge-side screw hole 28 may be a stop hole that opens to the lower surface 22 and does not open to the recessed portion 27d side (insert mounting portion 27 side).

[0102] In the above-described embodiment, the center C of the cartridge-side screw hole 28 and the center of the arc of the recessed portion 27d are arranged so as to be coaxial (aligned) with each other, but this is not limited thereto. The center C of the cartridge-side screw hole 28 and the center of the arc of the recessed portion 27d may not be aligned. The cartridge-side screw hole 28 may be, for example, a through-hole that passes through the cartridge member 2 in the vertical direction, or a stop hole that opens to the lower surface 22, at a position separate from the recessed portion 27d.

[0103] In the above-described embodiment, the center C of the cartridge-side screw hole 28 is positioned within the range of the recessed portion 27d when viewed from the top-bottom direction, but this is not limiting. The center C of the cartridge-side screw hole 28 may be positioned outside the range of the recessed portion 27d. The cartridge-side screw hole 28 may be, for example, a through-hole that passes through the cartridge member 2 in the top-bottom direction at a position separate from the recessed portion 27d, or a stop hole that opens to the bottom surface 22.

[0104] In the above-described embodiment, the cutting insert 3 may be fixed to the insert mounting portion 27 by a wedge member (not shown) or the like other than the fixing screw 6 .

[0105] In the above-described embodiment, spring washers, ring lock washers, etc. may be used to fasten the screws 4, 5, and 6. This can further ensure a restraining force.

[0106] In the above-described embodiment, the material of the substrate of the cutting insert 3 may be, in addition to cemented carbide containing tungsten carbide (WC) and cobalt (Co), for example, cermet, high-speed steel, titanium carbide, silicon carbide, silicon nitride, aluminum nitride, aluminum oxide, and ceramics consisting of mixtures thereof, cubic boron nitride sintered body, diamond sintered body, or ultra-high pressure sintered body obtained by sintering a hard phase consisting of polycrystalline diamond or cubic boron nitride with a binder phase such as ceramics or iron group metal under ultra-high pressure.

[0107] In the above-described embodiment, the cutting insert 3 has a polygonal plate shape, and in this embodiment, it has a rectangular plate shape, but the shape is not limited thereto. The cutting insert 3 may have, for example, a circular plate shape or a hexagonal plate shape. In this case, the shape of the insert mounting portion 27 (bottom surface 27a, pair of wall surfaces 27b, 27c) of the cartridge member 2 may be changed to match the shape of the outer circumferential surface 33 of the cutting insert 3. In this way, by making the cartridge member 2 match the shape and size of the cutting insert 3, cutting inserts of various shapes can be mounted on one tool body 1.

[0108] The present invention may be combined with the various configurations described in the above-described embodiments and modifications, and may also include additions, omissions, substitutions, and other modifications of the configurations, without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the above-described embodiments, but is limited only by the claims. [Example]

[0109] The present invention will be described in more detail below with reference to examples, although the present invention is not limited to these examples.

[0110] <Impact test (presence or absence of gaps)> As Example 1 of the present invention, the indexable rotary cutting tool 20 described in the above embodiment was prepared. As Example 2 of the present invention, the indexable rotary cutting tool 20 described above was prepared, in which commercially available spring washers were used to fasten the first screw 4 and the second screw 5.

[0111] Furthermore, as Comparative Example 1, a tool was prepared in which the aforementioned indexable rotary cutting tool 20 did not use the first screw 4 to attach the cartridge member 2 to the cartridge mounting portion 11, but only the second screw 5. Furthermore, as Comparative Example 2, a tool was prepared in which the aforementioned indexable rotary cutting tool 20 did not use the first screw 4 to attach the cartridge member 2 to the cartridge mounting portion 11, but used the second screw 5, and a portion of the upper surface 21 of the cartridge member 2 that is located radially inward from the insert mounting portion 27 was pressed downward (in the direction opposite to the tool rotation) by a wedge member.

[0112] Then, for each of the tools of Examples 1 and 2 and Comparative Examples 1 and 2, a constant force of impact was applied to the cartridge member 2 with a plastic hammer from a direction that is likely to cause a gap between the first wall surface 11a of the cartridge mounting portion 11 and the lower surface 22 of the cartridge member 2, and the presence or absence of a gap was confirmed. The impact was applied 1,000 times for each tool.

[0113] The results of the impact test are shown in Table 1 below. In Table 1, a circle indicates a case where a gap gauge of a predetermined thickness (for 5 μm or 10 μm) could not be inserted between the first wall surface 11 a of the cartridge mounting portion 11 and the lower surface 22 of the cartridge member 2 (i.e., no gap was generated). A cross indicates a case where a gap gauge of a predetermined thickness could be inserted between the first wall surface 11 a of the cartridge mounting portion 11 and the lower surface 22 of the cartridge member 2 (i.e., a gap was generated).

[0114] [Table 1]

[0115] As shown in Table 1, before the impact test, no gaps of 5 μm or more were formed in Examples 1 and 2 and Comparative Examples 1 and 2. In contrast, after the impact test, no gaps of 5 μm or more were formed in Examples 1 and 2, but gaps of 10 μm or more were formed in Comparative Example 1, and gaps of 5 μm or more but less than 10 μm were formed in Comparative Example 2.

[0116] Specifically, in Comparative Example 1, a gap occurred after 10 impacts were applied. In Comparative Example 2, a gap occurred near the outer peripheral end (radially outer end) between the first wall surface 11a of the cartridge mounting portion 11 and the lower surface 22 of the cartridge member 2.

[0117] Therefore, it was found that in Examples 1 and 2, the fixing force (adhesion) of the cartridge member 2 to the cartridge mounting portion 11 was increased by the pulling force of the first screw 4 compared to Comparative Examples 1 and 2.

[0118] <Cutting test (presence or absence of screw loosening)> Using the tools of Example 2 and Comparative Example 2 described above, cutting was performed under the cutting conditions below, and the presence or absence of loosening of the screws fixing the cartridge member 2 was confirmed.

[0119] [Cutting conditions] Tool diameter (tool cutting edge diameter): 160 mm Number of cutting inserts (number of cutting inserts attached to the tool): 1 ·Cutting speed: Vc=180m / min Spindle speed: n=358 min -1 Feed per tooth: fz=1.0mm / t Feed rate: Vf=358mm / min Axial depth of cut: ap=1.0mm Radial cutting width: ae=100mm Coolant: Dry ·Work material: S50C ·Equipment used: OKK VM660R

[0120] Under the above cutting conditions, cutting was performed for each tool for 85 minutes (the number of impacts on the cutting insert was 30,430). Then, for Example 2, the first screw 4 and the second screw 5 were checked for looseness, and for Comparative Example 2, the second screw 5 and the screw securing the wedge member were checked for looseness. The amount of flank wear (maximum value) of the cutting edge 34 of each tool was also checked. The results of the cutting test are shown in Table 2 below.

[0121] [Table 2]

[0122] As shown in Table 2, in the cutting test, no loosening of the screws occurred in either Example 2 or Comparative Example 2. Furthermore, in both Example 2 and Comparative Example 2, the flank wear amount (VBmax) was an appropriate value (within the allowable range).

[0123] Therefore, it was found that compared to Comparative Example 2, which used a wedge member (dedicated part), Example 2, which used commercially available screws and spring washers, could reduce manufacturing costs while maintaining the same performance. [Industrial Applicability]

[0124] The indexable rotary cutting tool body and indexable rotary cutting tool of the present invention can reduce manufacturing costs and enable the cutting insert to be stably fixed by the cartridge member, and therefore have industrial applicability. [Explanation of symbols]

[0125] 1...Tool body, 2...Cartridge member, 3...Cutting insert, 4...First screw, 4a...First screw shaft (screw shaft), 4b...First screw head (screw head), 5...Second screw, 6...Fixing screw, 10...Indexable rotary cutting tool body, 11...Cartridge mounting portion, 13...Holder side insertion hole, 13a...Holder side insertion hole portion (insertion hole portion), 13b...Holder side accommodation hole portion (accommodation hole portion), 14...Holder side screw hole, 20...Indexable rotary cutting Tool, 21...upper surface, 22...lower surface, 23...tip surface, 24...rear end surface, 25...inner surface, 26...outer surface, 27...insert mounting portion, 27a...bottom surface, 27b, 27c...wall surface, 27d...recessed portion, 27e...fixing screw hole, 28...cartridge side screw hole, 29...cartridge side insertion hole, 32...seating surface (insert lower surface), 33...outer periphery, C...center of cartridge side screw hole, L, M...width, O...rotation axis, T...tool rotation direction

Claims

1. a tool body that rotates around a rotation axis; a cartridge member detachably attached to a cartridge attachment portion disposed on the outer periphery of the tip of the tool body; a first screw for fixing the cartridge member to the cartridge mounting portion, The cartridge member includes: an upper surface facing the tool rotation direction around the rotation axis; a lower surface facing the opposite side to the tool rotation direction around the rotation axis; an insert mounting portion having a recessed shape recessed from the upper surface, to which a cutting insert is detachably mounted; a cartridge-side screw hole that opens to the bottom surface, the tool body has a holder-side through-hole that opens to the cartridge mounting portion and is disposed opposite the cartridge-side screw hole, the first screw is inserted into the holder-side through-hole and screwed into the cartridge-side screw hole, thereby fixing the cartridge member and the cartridge mounting portion together; Indexable rotary cutting tool body.

2. The cartridge member includes: a rear end surface facing a rear end side in an axial direction in which the rotation shaft extends; an inner surface facing inward in a radial direction perpendicular to the rotation axis, The overall length of the cartridge member in the radial direction is defined as width L, and the overall length of the cartridge member in the axial direction is defined as width M, When the top surface of the cartridge member is viewed from the front, the center of the cartridge-side screw hole is located at a position that is ½ or more of a width L from the inner surface toward the outside in the radial direction, and is located at a position that is ¼ or more of a width M from the rear end surface toward the tip side in the axial direction. The indexable rotary cutting tool body according to claim 1 .

3. The insert mounting portion is a bottom surface that contacts the seating surface of the cutting insert; A pair of wall surfaces that contact the outer peripheral surface of the cutting insert; a recessed portion disposed between the pair of wall surfaces, When the top surface of the cartridge member is viewed from the front, the cartridge-side screw hole and the recessed portion overlap each other. The indexable rotary cutting tool body according to claim 1 .

4. The insert mounting portion is a bottom surface that contacts the seating surface of the cutting insert; a fixing screw hole that opens to the bottom surface and into which a fixing screw that fixes the cutting insert is screwed, the diameter of the cartridge-side screw hole is equal to or greater than the diameter of the fixing screw hole; The female thread of the cartridge-side screw hole has 5 pitches or more. The indexable rotary cutting tool body according to any one of claims 1 to 3.

5. a second screw for fixing the cartridge member to the cartridge mounting portion from a direction different from that of the first screw; The cartridge member includes: a tip end surface facing a tip end side in an axial direction in which the rotation shaft extends; a rear end surface facing the rear end side in the axial direction; a cartridge-side insertion hole that opens to the front end surface and the rear end surface, the tool body has a holder-side screw hole that opens to the cartridge mounting portion and is arranged opposite the cartridge-side insertion hole, the second screw is inserted into the cartridge-side insertion hole and screwed into the holder-side screw hole, thereby fixing the cartridge member and the cartridge mounting portion together; The indexable rotary cutting tool body according to any one of claims 1 to 3.

6. The first screw is a screw shaft that is screwed into the cartridge-side screw hole; a screw head having an outer diameter dimension larger than that of the screw shaft, The holder-side insertion hole is An insertion hole portion having an inner diameter smaller than that of the screw head and into which the screw shaft is inserted; An accommodating hole portion having an inner diameter dimension larger than that of the screw head, The indexable rotary cutting tool body according to any one of claims 1 to 3.

7. An indexable rotary cutting tool comprising the cutting insert attached to the cartridge member of the indexable rotary cutting tool body according to claim 1 .

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