Cutting tools, machining equipment

Abstract

To provide a cutting tool and a machining apparatus capable of suppressing curling of chips while suppressing deterioration in quality of a finished surface of a workpiece.SOLUTION: A cutting tool 10 is a tool that machines a workpiece W when relatively moved with respect to the workpiece W at a predetermined machining feed amount. The cutting tool 10 includes: a holder 20; and a tip 30 fixed to the holder 20. The tip 30 includes: a rake face 31 provided on one surface; a blade ridge 33 continuous to the rake face 31; and guide grooves 34, 35, 36, 37 for guiding chips CH flowing out from the blade ridge 33 to the rake face 31. Each of the guide grooves 34, 35, 36, 37 is formed with respect to the rake face 31, so as to linearly extend in a direction separating, with respect to the blade ridge 33, away from portions other than a finishing part that generates a finished surface of the workpiece W, of the blade ridge 33.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a cutting tool that processes a workpiece by moving it relatively to the workpiece at a predetermined processing feed amount, and a processing device including the cutting tool. [Background technology]

[0002] Conventionally, cutting tools that correct the curl of chips and the direction of chip outflow have been known (see, for example, Patent Document 1). Patent Document 1 discloses a technique for controlling the direction of chip outflow using a plurality of guide grooves. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-208161 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a guide groove is provided on the rake face that extends from the tip of the cutting edge in a direction away from the cutting edge, as in the prior art, the shape of the guide groove is transferred to the finished surface of the workpiece, which is undesirable because it can lead to a deterioration in the quality of the finished surface of the workpiece.

[0005] An object of the present disclosure is to provide a cutting tool and a processing device that can suppress curling of chips while suppressing deterioration in the quality of the finished surface of a workpiece. [Means for solving the problem]

[0006] The invention described in claim 1 is A cutting tool that processes a workpiece (W) by moving it relatively to the workpiece (W) at a predetermined processing feed amount, A holder portion (20, DH), a tip portion (30, 30A, CP) fixed to the holder portion; The tip part is A rake surface (31, SP) provided on one side; The cutting edge (33, Cb, Ca, Cs) is connected to the rake face. a guide portion (34, 35, 36, 37, 38, 39, G) that guides chips flowing from the cutting edge portion to the rake face, The guide portion is formed on the rake face so as to extend linearly in a direction away from the cutting edge portion from other portions of the cutting edge portion other than the finishing portion (331a, Cs) that generates the finished surface of the workpiece. And, A plurality of guide grooves (34, 35, 36, 37) are formed on the rake face as guide portions, When a virtual line extending linearly from the apex (331) of the cutting edge portion closest to the workpiece in a direction away from the cutting edge portion is defined as a reference line (IL), The plurality of guide grooves have a small distance from the reference line but a large groove depth compared to a large distance from the reference line but a large groove depth. .

[0007] This allows the guide portion to prevent some of the chips from curling. In addition, since there is no guide portion on the finishing portion of the cutting edge, the guide portion is prevented from being transferred to the finished surface of the workpiece. Therefore, it is possible to prevent the curling of chips while preventing a decrease in the quality of the finished surface of the workpiece.

[0008] The invention described in claim 5 is A processing device, Claims 1 to 4 A cutting tool (10) according to any one of the above items, The cutting tool is provided with a suction device (5) for sucking up chips generated when the workpiece is machined by the cutting tool.

[0009] This allows the suction device to properly suck up chips that flow along the guide portion. Also, in a configuration in which chips are sucked up by a suction device, it is not necessary to pass the chips between a pair of rollers, as is the case with a configuration in which chips are pulled by a pair of rollers, and therefore the workability of the cutting process can be improved.

[0010] The reference symbols in parentheses attached to each component indicate an example of the correspondence between the component and the specific components described in the embodiments described below. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic configuration diagram of a processing device according to a first embodiment. [Figure 2] FIG. 2 is an explanatory diagram for explaining a cutting tool. [Figure 3] FIG. 2 is a plan view showing the rake face side of the tip portion of the cutting tool. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. [Figure 5] FIG. 1 is an explanatory diagram for explaining chips produced by a cutting tool. [Figure 6] FIG. 2 is an explanatory diagram for explaining the cross-sectional shape of chips produced by a cutting tool. [Figure 7] FIG. 6 is an explanatory view for explaining the cross-sectional shape of a tip portion of a cutting tool according to a second embodiment. [Figure 8] FIG. 2 is an explanatory diagram for explaining the cross-sectional shape of chips produced by a cutting tool. [Figure 9] FIG. 10 is a perspective view of a tip portion of a cutting tool according to a third embodiment. [Figure 10] FIG. 10 is an enlarged view of the X portion of FIG. 9. [Figure 11] FIG. 10 is a plan view of a cutting tool according to a fourth embodiment. [Figure 12] FIG. 12 is an enlarged view of part XII in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, parts that are the same as or equivalent to those described in the preceding embodiments will be given the same reference numerals, and their description may be omitted. Furthermore, in the embodiments, when only some of the components are described, the components described in the preceding embodiments can be applied to the remaining components. The following embodiments can be partially combined with each other, even if not specifically stated, as long as there is no particular problem with the combination.

[0013] (First embodiment) This embodiment will be described with reference to Figs. 1 to 6. A cutting tool 10 shown in Fig. 1 is a tool that turns a workpiece W by moving the tool relative to the workpiece W at a predetermined processing feed rate. Fig. 1 illustrates an example in which the workpiece W is an object having a substantially cylindrical shape, and the outer periphery of the workpiece W is turned by the cutting tool 10. Note that the workpiece W is not limited to an object having a substantially cylindrical shape, and may be an object having a shape other than a substantially cylindrical shape.

[0014] The cutting tool 10 is attached to a tool table 2 of a processing device 1. The processing device 1 includes a spindle 3 that rotates while holding a workpiece W, a tool table 2 that is movable in two mutually perpendicular axial directions, a feed mechanism 4 that moves the tool table 2 in the axial direction of the spindle 3 at a predetermined processing feed amount, a suction device 5, etc.

[0015] The suction device 5 is a device that sucks up chips CH produced by the cutting tool 10. The suction device 5 includes a chamber 51 for storing the chips CH, a suction pump 52 that sucks the chips CH into the chamber 51, and a suction duct 53 that guides the chips CH to the chamber 51. The suction duct 53 has an opening at its suction port 531 for the chips CH.

[0016] The suction device 5 has a suction port 531 that opens in the outflow direction of the chips CH that are corrected by the guide groove 34 of the tip portion 30, which will be described later, so that the chips CH are sucked into the suction duct 53. That is, the suction duct 53 is arranged so that the opening direction of the suction port 531 is aligned with the outflow direction of the chips CH that are corrected by the guide groove 34 of the tip portion 30, which will be described later (hereinafter also referred to as the corrected outflow direction).

[0017] 2, cutting tool 10 includes a holder portion 20 fixed to a tool table 2 and a tip portion 30 fixed to holder portion 20. Cutting tool 10 may be configured such that holder portion 20 and tip portion 30 are integrated into a complete tool bit, or such that tip portion 30 is configured as a separate piece so that it is replaceable.

[0018] 2, the tip portion 30 includes a rake face 31 provided on one surface, a flank 32 continuous with the rake face 31, a cutting edge 33 located between the rake face 31 and the flank 32, and a guide groove 34 that guides chips CH flowing from the cutting edge 33 to the rake face 31. The tip portion 30 has one cutting edge 331 provided on the cutting edge 33. Note that the cutting edge 33 may have multiple cutting edges 331.

[0019] The tip 30 is configured as a sword tool for turning the workpiece W. As shown in FIG. 3, the tip 30 is configured as a round-tip sword tool in which the cutting edge 331 at the cutting edge 33 is entirely rounded. In the tip 30 configured in this manner, the apex 331a of the cutting edge 33, which is located closest to the workpiece W, becomes the finishing portion that generates the finished surface of the workpiece W. In this embodiment, a virtual line extending linearly from the apex 331a in a direction away from the cutting edge 33, is used as the reference line IL. This reference line IL is a normal line perpendicular to the tangent to the apex 331a.

[0020] The rake face 31 of the tip portion 30 is a flat surface. As shown in Fig. 3, the rake face 31 has a first rake face portion 311 and a second rake face portion 312 adjacent to each other across a reference line IL.

[0021] Four guide grooves 34, 35, 36, and 37 are formed on the rake face 31. Each of the guide grooves 34, 35, 36, and 37 is a guide portion that guides chips CH that flow from the cutting edge portion 33 to the rake face 31. In Fig. 3, each of the guide grooves 34, 35, 36, and 37 is marked with a dot pattern to facilitate understanding of the drawing.

[0022] Here, when a cutting tool 10 without guide grooves 34, 35, 36, 37 on the rake face 31 is used as a comparative example, according to Colwell's rule of thumb, the outflow direction of chips CH from the comparative cutting tool 10 is generally determined by the processing feed rate, the depth of cut, and the shape of the cutting edge 331. In this embodiment, the outflow direction of chips CH theoretically predicted based on Colwell's rule of thumb is set as the reference outflow direction.

[0023] If the chips CH flow out in the standard flow direction, there is a risk that the chips CH may come into contact with the workpiece W or become entangled in surrounding equipment. In addition, the degree of freedom in the layout of the equipment around the cutting tool 10 is reduced.

[0024] Taking these factors into consideration, the cutting tool 10 of this embodiment is configured to correct the outflow direction of chips CH to a direction different from the reference outflow direction. Specifically, in the cutting tool 10, the guide grooves 34, 35, 36, and 37 extend in a direction different from the reference outflow direction. For example, the guide grooves 34, 35, 36, and 37 extend so that the angle they form with the reference outflow direction is 40° or less. This configuration makes it easier for chips CH to flow in a direction intersecting the reference outflow direction (i.e., the corrected outflow direction), as shown in FIG. 1.

[0025] The groove depth Gd of each of the guide grooves 34, 35, 36, and 37 is substantially constant on the side closer to the apex 331a. The groove depth Gd of each of the guide grooves 34, 35, 36, and 37 gradually decreases from a position a predetermined distance away from the apex 331a until it reaches the rake face 31. The angle θg of the bottom surface of the guide groove 34 with respect to the rake face 31 is a maximum of 30° or more.

[0026] Each of the guide grooves 34, 35, 36, and 37 is formed on the rake face 31 so as to extend linearly from a portion other than the apex 331a in a direction away from the cutting edge ridge 33. Each of the guide grooves 34, 35, 36, and 37 is formed so as not to intersect with the reference line IL. In this embodiment, each of the guide grooves 34, 35, 36, and 37 extends substantially parallel to the reference line IL so as not to intersect with the reference line IL.

[0027] Specifically, the first rake face portion 311 is provided with a first outer guide groove 34 that is large in distance from the reference line IL, and a first inner guide groove 35 that is smaller in distance from the reference line IL than the first outer guide groove 34. The second rake face portion 312 is provided with a second outer guide groove 36 that is large in distance from the reference line IL, and a second inner guide groove 37 that is smaller in distance from the reference line IL than the second outer guide groove 36. In this embodiment, the first inner guide groove 35 and the second inner guide groove 37 form a "pair of grooves" adjacent to each other across the reference line IL.

[0028] As shown in FIG. 4 , each of the guide grooves 34, 35, 36, and 37 has a substantially arc-shaped cross section. The guide groove 34 is formed by grinding, electrical discharge machining, laser machining, or the like. Specifically, when the tip portion 30 is made of a carbide material, grinding is suitable for forming the guide groove 34, while when the tip portion 30 is made of sintered diamond, PCD (Polycrystalline Diamond), electrical discharge machining or laser machining is suitable. The cross section of the guide groove 34 may be trapezoidal, elliptical, or the like. Alternatively, the guide grooves 34, 35, 36, and 37 may be formed during firing of the tip portion 30 by providing a mold for manufacturing the tip portion 30 with an inverse shape to the guide grooves 34, 35, 36, and 37.

[0029] The guide grooves 34, 35, 36, and 37 have a groove depth Gd of approximately the same value (e.g., 0.1 mm). The groove depth Gd of each of the guide grooves 34, 35, 36, and 37 is set to, for example, ¼ or more of the cutting thickness of the workpiece W. The cutting thickness is determined according to the shape of the cutting edge 331 of the cutting tool 10, the processing feed rate, and other processing conditions.

[0030] The guide grooves 34, 35, 36, and 37 have a groove width Gw that is approximately the same (for example, 0.35 mm). The groove width Gw of each of the guide grooves 34, 35, 36, and 37 is greater than the groove depth Gd.

[0031] Each of the inner guide grooves 35, 37 is provided adjacent to the apex 331a that generates the finished surface of the workpiece W, and has a greater effect on the finished surface than each of the outer guide grooves 34, 36. Therefore, in order to reduce the effect on the finished surface due to the presence of each of the inner guide grooves 35, 37, it is desirable that the groove width Gw of each of the inner guide grooves 35, 37 be equal to or less than the processing feed amount.

[0032] Furthermore, the distance C1 between the first outer guide groove 34 and the first inner guide groove 35 is smaller than the groove width Gw. Similarly, the distance C2 between the second outer guide groove 36 and the second inner guide groove 37 is smaller than the groove width Gw. If the distances C1 and C2 are too small, chipping will occur easily, so it is necessary to ensure a certain size (for example, 0.1 mm).

[0033] Furthermore, the distances C3 and C4 between the inner guide grooves 35 and 37 and the reference line IL are smaller than the groove width Gw. If the distances C3 and C4 are small, the presence of the inner guide grooves 35 and 37 may affect the finished surface. For this reason, it is desirable that the distances C3 and C4 be greater than or equal to the processing feed amount.

[0034] Next, a brief description will be given of the operation during machining of the workpiece W. With the spindle 3 holding the workpiece W rotating, cutting processing begins when the cutting tool 10 attached to the tool table 2 is moved to a cutting start position for the workpiece W. In this cutting process, the cutting tool 10 is moved relative to the workpiece W at a predetermined machining feed amount, thereby turning the workpiece W into a desired shape.

[0035] Specifically, the cutting edge 331 of the tip portion 30 comes into contact with the outer periphery of the workpiece W, thereby turning the outer periphery of the workpiece W. At this time, some of the chips CH from the workpiece W enters into parts of the guide grooves 34, 35, 36, and 37 formed in the tip portion 30, causing the chips CH to flow out along the corrective outflow direction.

[0036] For example, when the cutting tool 10 is moved from one side to the other in the axial direction of the spindle 3 to machine the workpiece W, as shown in Figures 5 and 6, a portion of the chip CH enters the first outer guide groove 34 and the first inner guide groove 35. By having a portion of the chip CH enter the first outer guide groove 34 and the first inner guide groove 35, deformation in the width direction of each guide groove 34, 35, 36, 37 (i.e., lateral curl) is suppressed. In addition, the chip CH forms a first convex portion BP1 and a second convex portion BP2 corresponding to the shapes of the first outer guide groove 34 and the first inner guide groove 35, respectively. This makes the chip CH take on a shape that is less likely to bend (e.g., a wavy shape), improving the rigidity of the chip CH and suppressing curling of the chip CH.

[0037] Furthermore, when the cutting tool 10 is moved from the other side to one side in the axial direction of the spindle 3 to machine the workpiece W, some of the chips CH enter the second outer guide groove 36 and the second inner guide groove 37. By having some of the chips CH enter the second outer guide groove 36 and the second inner guide groove 37, deformation in the width direction (i.e., lateral curl) of each guide groove 34, 35, 36, 37 is suppressed. Furthermore, by forming convex portions in the chips CH corresponding to the shapes of the second outer guide groove 36 and the second inner guide groove 37, the rigidity of the chips CH is improved and curling of the chips CH is suppressed.

[0038] In the cutting tool 10 described above, each guide groove 34, 35, 36, 37 is formed on the cutting face 31 so as to extend linearly in a direction away from the cutting edge portion 33 from other parts of the cutting edge portion 33 other than the apex 331a that generates the finishing surface of the workpiece W.

[0039] This prevents the chips CH from curling by allowing a portion of the chips CH to enter a portion of each guide groove 34, 35, 36, and 37. Furthermore, the guide grooves 34, 35, 36, and 37 increase the rigidity of the chips CH, stabilizing the outflow direction of the chips CH and making it easier to properly collect the chips CH.

[0040] In addition, because the guide grooves 34, 35, 36, and 37 are not present in the finishing portion of the cutting edge ridge 33, the guide grooves 34, 35, 36, and 37 are prevented from being transferred to the finished surface of the workpiece W. For example, chipping may occur in the edge portions of the guide grooves 34, 35, 36, and 37, but the effects of such chipping are unlikely to have a significant impact on the finished surface of the workpiece W.

[0041] Therefore, according to the cutting tool 10 of this embodiment, it is possible to suppress the curling of chips CH while suppressing the deterioration of the quality of the finished surface of the workpiece W.

[0042] The cutting tool 10 of this embodiment also has the following features.

[0043] (1) A plurality of guide grooves 34, 35, 36, and 37 are formed on the rake face 31. This forms a plurality of convex portions on the cross section of the chips CH, increasing the rigidity of the chips CH and suppressing curling of the chips CH.

[0044] (2) Specifically, the tip portion 30 is formed as a sawtooth tool for turning the workpiece W, and has, as a finishing portion, an apex 331a of the cutting edge 33 that is located closest to the workpiece W. The guide grooves 34, 35, 36, and 37 are formed on the rake face 31 so as to extend linearly from portions of the cutting edge 33 other than the apex 331a in a direction away from the cutting edge 33. As a result, the guide grooves 34, 35, 36, and 37 are not present at the apex 331a of the cutting edge 33, and therefore the transfer of the guide grooves 34, 35, 36, and 37 to the finishing surface of the workpiece W is suppressed.

[0045] (3) Each of the guide grooves 34, 35, 36, and 37 includes a pair of adjacent grooves sandwiching the reference line IL. This prevents the chips CH from curling even if the feed direction of the cutting tool 10 is reversed. This cutting tool 10 is suitable for cutting processes in which tool paths in different directions exist.

[0046] (4) The distances C3, C4 between the first inner guide groove 35 and the reference line CL and the second inner guide groove 37 are equal to or greater than the processing feed amount. This prevents the inner guide grooves 35, 37 from being transferred to the finished surface of the workpiece W.

[0047] (5) The rake face 31 has a first rake face portion 311 and a second rake face portion 312 adjacent to each other across the reference line IL. A first outer guide groove 34 and a first inner guide groove 35 are formed in the first rake face portion 311. A second outer guide groove 36 and a second inner guide groove 37 are formed in the second rake face portion 312. In this way, if two grooves are formed in each rake face portion 311, 312, multiple irregularities are formed on the cross section of the chips CH, thereby sufficiently suppressing curling of the chips CH. Note that, in this embodiment, an example in which two grooves are formed in each rake face portion 311, 312 has been described, but this is not limiting, and three or more grooves may be formed in each rake face portion 311, 312.

[0048] (6) Each of the guide grooves 34, 35, 36, and 37 extends in a direction different from the reference outflow direction. This prevents the chips CH from contacting the workpiece W and from becoming tangled within the equipment. Also, it becomes possible to arrange a device other than the chip suction device 5 for the chips CH in a position corresponding to the reference outflow direction of the chips CH, improving the degree of freedom in the layout of the devices around the cutting tool 10.

[0049] (7) The processing device 1 is equipped with a suction device 5 that sucks up chips CH generated when the workpiece W is processed by the cutting tool 10. This allows the suction device 5 to properly suck up chips CH that flow out along each of the guide grooves 34, 35, 36, and 37. Furthermore, the configuration in which the suction device 5 sucks up chips CH eliminates the need to pass chips CH between a pair of rollers, as is the case with devices that pull chips CH with a pair of rollers, thereby improving the workability of the cutting process.

[0050] (8) The suction device 5 has a suction duct 53 that sucks in the chips CH. The suction duct 53 has a suction port 531 that opens in the outflow direction of the chips CH that are corrected by the guide grooves 34, 35, 36, and 37. This allows the suction device 5 to properly suck in the chips CH.

[0051] (Modification of the first embodiment) In the first embodiment, two grooves are formed on each of the rake face portions 311, 312, but this is not limiting, and for example, one groove may be formed on each of the rake face portions 311, 312. Also, a groove may be formed on only one of the rake face portions 311, 312. This also applies to the following embodiments.

[0052] In the first embodiment, the guide grooves 34, 35, 36, and 37 are illustrated as being parallel to the reference line IL, but they do not have to be parallel to the reference line IL. At least a portion of each of the guide grooves 34, 35, 36, and 37 may intersect with the reference line IL.

[0053] The processing device 1 of the first embodiment is provided with a suction device 5 that sucks up chips CH, but is not limited to this, and the suction device 5 may be omitted, or the chips CH may be pulled by a pair of rollers. This also applies to the following embodiments.

[0054] (Second embodiment) Next, a second embodiment will be described with reference to Figures 7 and 8. In this embodiment, differences from the first embodiment will be mainly described.

[0055] In the cutting process, the cutting edge 331 of the tip portion 30 comes into contact with the workpiece W sequentially from the outside to the inside. The thickness of the chip CH at the portion corresponding to the outside of the cutting edge 331 tends to be greater than the thickness of the portion corresponding to the inside of the cutting edge 331.

[0056] 7, in the tip portion 30 of this embodiment, the groove depth Gdo of the first outer guide groove 34 and the second outer guide groove 36 is greater than the groove depth Gdi of the first inner guide groove 35 and the second inner guide groove 37. Furthermore, in the tip portion 30, the groove width Gwo of the first outer guide groove 34 and the second outer guide groove 36 is greater than the groove width Gwi of the first inner guide groove 35 and the second inner guide groove 37.

[0057] 8, the chip CH is formed with a first convex portion BP1 corresponding to the shape of the first outer guide groove 34 or the second outer guide groove 36, and a second convex portion BP2 corresponding to the shape of the first inner guide groove 35 or the second inner guide groove 37. The first convex portion BP1 is larger than the second convex portion BP2.

[0058] The other points are the same as those of the first embodiment. The cutting tool 10 of this embodiment can obtain the same effects as those of the first embodiment that are achieved by a configuration common to or equivalent to that of the first embodiment.

[0059] The cutting tool 10 of this embodiment also has the following features.

[0060] (1) The groove depth Gdo of each of the outer guide grooves 34, 36, which is located farther from the reference line IL than the groove depth Gdi of each of the inner guide grooves 35, 37, which is located nearer to the reference line IL, is greater. This increases the rigidity of the chips CH at positions away from the apex 331a of the cutting edge 33, thereby ensuring the quality of the finished surface of the workpiece W and sufficiently suppressing curling of the chips CH.

[0061] (Third embodiment) Next, a third embodiment will be described with reference to Figures 9 and 10. In this embodiment, differences from the first embodiment will be mainly described.

[0062] As shown in Fig. 9, the tip portion 30A of this embodiment is configured as a generally diamond-shaped sword tool. The tip portion 30A has cutting ridges 33 at acute angled portions facing each other.

[0063] 10, the tip portion 30A has guide grooves 38, 39 formed on each of the rake face portions 311, 312. Note that the tip portion 30A may have two or more grooves formed on each of the rake face portions 311, 312, or may have a groove formed on one of the rake face portions 311, 312.

[0064] The rest of the cutting tool 10A is the same as that of the first embodiment. The cutting tool 10A of the present embodiment can obtain the same effects as those of the first embodiment, which are achieved by a configuration common to or equivalent to that of the first embodiment.

[0065] (Fourth embodiment) Next, a fourth embodiment will be described with reference to Figures 11 and 12. In this embodiment, differences from the first embodiment will be mainly described.

[0066] As shown in Fig. 11, the cutting tool 10 of this embodiment is a drill reamer DR for finishing holes, not for turning. The drill reamer DR has a rod-shaped holder DH and a tip portion CP provided on one end of the holder DH. The drill reamer DR may have the holder DH and the tip portion CP configured as an integral unit, or the tip portion CP may be configured to be replaceable.

[0067] As shown in Figure 12, the tip portion CP has multiple cutting edges CE. Each cutting edge CE has a rake face SP, a bottom cutting edge portion Cb for cutting as a cutting ridge, a chamfering portion Ca connected to the bottom cutting edge Cb, and a side cutting edge Cs for generating a finishing surface. The rake face SP of the cutting edge CE has three guide grooves G formed in the direction away from the chamfering portion Ca, rather than in the side cutting edge Cs that constitutes the finishing portion. It is sufficient that at least one guide groove G is formed for each rake face SP.

[0068] The cutting tool 10 configured as above can obtain the same effects as the first embodiment that are achieved by a configuration common to or equivalent to the first embodiment.

[0069] According to the cutting tool 10 of this embodiment, a portion of the chips CH enters a portion of the guide groove G, thereby suppressing curling of the chips CH. Furthermore, the guide groove G increases the rigidity of the chips CH, stabilizing the flow direction of the chips CH and making it easier to properly collect the chips CH. Furthermore, since the side cutting edge Cs constituting the finishing portion does not have the guide groove G, the guide groove G is suppressed from being transferred to the finished surface of the workpiece W.

[0070] Therefore, the cutting tool 10 of this embodiment can also suppress deterioration in the quality of the finished surface of the workpiece W while suppressing curling of the chips CH.

[0071] (Other embodiments) Representative embodiments of the present disclosure have been described above, but the present disclosure is not limited to the above-described embodiments and can be modified in various ways, for example, as follows.

[0072] In the above embodiment, the tip portion 30 has a plurality of guide grooves 34, 35, 36, and 37 formed on the rake face 31 as guide portions, but is not limited to this. For example, the tip portion 30 may have a protrusion formed on the rake face 31 as a guide portion.

[0073] In the above-described embodiments, it goes without saying that the elements constituting the embodiments are not necessarily essential unless they are specifically stated as essential or are clearly considered essential in principle.

[0074] In the above-described embodiments, when numerical values ​​such as the number, values, amounts, ranges, etc. of components of the embodiments are mentioned, they are not limited to the specific numbers unless they are expressly stated as being essential or are clearly limited to a specific number in principle.

[0075] In the above-described embodiments, when referring to the shapes, positional relationships, etc. of components, etc., the shapes, positional relationships, etc. are not limited to those unless otherwise specified or when they are limited in principle to specific shapes, positional relationships, etc. [Explanation of symbols]

[0076] 1 Processing equipment 10 cutting tools 20 Holder part 30 Tip section 31 Rake face 33 Edge line 331 Top 34, 35, 36, 37 Guide groove

Claims

1. A cutting tool that processes a workpiece (W) by moving the workpiece relatively at a predetermined processing feed amount, A holder portion (20, DH), a tip portion (30, 30A, CP) fixed to the holder portion, The tip portion is A rake face (31, SP) provided on one side; a cutting edge portion (33, Cb, Ca, Cs) connected to the rake face; a guide portion (34, 35, 36, 37, 38, 39, G) that guides chips flowing from the cutting edge portion to the rake face, the guide portion is formed on the rake face so as to extend linearly in a direction away from the cutting edge portion from a portion of the cutting edge portion other than a finishing portion (331 a, Cs) that generates a finished surface of the workpiece, A plurality of guide grooves (34, 35, 36, 37) are formed on the rake face as the guide portion, When a virtual line extending linearly from the apex (331) of the cutting edge portion located closest to the workpiece in a direction away from the cutting edge portion is defined as a reference line (IL), The plurality of guide grooves have a depth greater than a depth at which the distance from the reference line is small, and a depth greater than a depth at which the distance from the reference line is large.

2. The tip portion is configured as a cutting tool for turning the workpiece, and has the top portion (331) as the finishing portion, 2. The cutting tool according to claim 1, wherein the plurality of guide grooves are formed on the rake face so as to extend linearly from portions of the cutting edge portion other than the apex in a direction away from the cutting edge portion.

3. The cutting tool according to claim 2 , wherein the plurality of guide grooves include a pair of grooves adjacent to each other with the reference line interposed therebetween.

4. 4. The cutting tool according to claim 3, wherein the rake face has a first rake face portion (311) and a second rake face portion (312) adjacent to each other across the reference line, and a plurality of the guide grooves are formed on each of the first rake face portion and the second rake face portion.

5. A cutting tool (10) according to any one of claims 1 to 4; and a suction device (5) that sucks up chips generated when the workpiece is machined by the cutting tool.

6. The suction device has a suction duct (53) for sucking chips, 6. The processing device according to claim 5, wherein the suction duct has a suction port (531) that opens in the outflow direction of chips corrected by the guide groove.

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