Lathe tool, and work-piece processing method

Abstract

To fit a shank to a tool fitting part of a lathe so that a direction, in which a tip of a chip extends, faces a target direction.SOLUTION: A lathe tool comprises a shank, and a chip fitted to the shank. The chip has a linearly extending blade tip, and a fitted part fitted to the shank. The shank has: a chip fitting part to which the chip is fitted; and a work-piece facing surface that faces a work-piece side, which is one side in a direction different from a blade extension direction and which is a side on which the tip exists with respect to the fitted part, in the state that the chip is fitted to the chip fitting part. On the work-piece facing surface, a reference plane, which is parallel to the tip linearly extending in the blade extension direction in the state that the chip is fitted to the chip fitting part, is formed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a turning tool and a method for machining a workpiece using the turning tool. [Background technology]

[0002] An example of a turning tool is the turning tool described in the following Patent Document 1. This turning tool T includes a shank that can be attached to a tool attachment portion of a lathe, and a tip that is attached to the shank. A cutting edge is formed on the tip. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 04-002505 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a small amount of play between the shank and the tool attachment of the lathe, so to attach the shank to the tool attachment so that the cutting edge of the tip attached to the shank faces in the desired direction requires a high level of skill from the worker, and it takes time to attach the shank to the tool attachment.

[0005] Therefore, an object of the present disclosure is to provide a turning tool that enables even a less skilled worker to attach a shank to a tool mounting portion of a lathe in a short time so that the cutting edge of the chip faces in the desired direction, and a method of machining a workpiece using this turning tool. [Means for solving the problem]

[0006] In order to achieve the above object, a turning tool according to one aspect of the invention comprises: The cutting tool includes a shank that can be attached to a tool attachment portion of a lathe, and a tip attached to the shank. The tip has a cutting edge extending linearly, and a mounting portion that is formed at a position spaced from the cutting edge in a direction different from the blade extension direction in which the cutting edge extends and is attached to the shank. The shank has a tip mounting portion to which the tip is attached, and a work-facing surface that faces the work side, which is one side in the direction different from the blade extension direction and is the side on which the cutting edge is located relative to the mounting portion of the tip, when the tip is attached to the tip mounting portion. A reference surface is formed on the work-facing surface that is parallel to the cutting edge that extends linearly in the blade extension direction when the tip is attached to the tip mounting portion.

[0007] In this embodiment, the mounting angle of the turning tool relative to the tool mounting portion of the lathe can be objectively adjusted by referring to the reference surface of the shank. Therefore, in this embodiment, even a less skilled worker can quickly mount the shank on the tool mounting portion of the lathe so that the direction in which the tip of the tip extends faces the desired direction. Therefore, in this embodiment, even a less skilled worker can improve the machining accuracy of the machined surface of the workpiece W.

[0008] In order to achieve the above object, a method for machining a workpiece according to one aspect of the invention comprises the steps of: In the method for machining a workpiece using a turning tool according to the above aspect, the following steps are carried out: a workpiece mounting step of mounting a workpiece on a workpiece mounting section of the lathe rotatable about an axis, a tip mounting step of mounting the tip to the shank, a tool mounting step of mounting the turning tool to the tool mounting section of the lathe after the tip mounting step so that the blade extension direction coincides with the tool feed direction, and a turning step of driving the lathe after the workpiece mounting step and moving the turning tool in the tool feed direction while turning the workpiece with the turning tool. The tool mounting step includes a mounting angle adjustment step of adjusting a mounting angle of the turning tool relative to the tool mounting section so that a path of the blade tip generated when the turning tool is fed in the tool feed direction is parallel to the reference surface of the turning tool.

[0009] In the mounting angle adjustment process of this embodiment, the mounting angle of the turning tool relative to the tool mounting portion of the lathe can be objectively adjusted by referring to the reference surface of the shank. Therefore, in this embodiment, even a less skilled worker can mount the shank on the tool mounting portion of the lathe in a short time so that the direction in which the tip of the insert extends faces the desired direction. Therefore, in this embodiment, even a less skilled worker can improve the machining accuracy of the machined surface of the workpiece. Effect of the Invention

[0010] According to one aspect of the present disclosure, even a less skilled worker can quickly attach the shank to the tool attachment portion of a lathe so that the cutting edge of the tip is oriented in the desired direction. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a front view of a turning tool in one embodiment according to the present disclosure. [Diagram 2] FIG. 2 is a view taken along the arrow II in FIG. [Diagram 3] FIG. 2 is a view taken along the arrow III in FIG. [Figure 4] FIG. 2 is a front view of a chip in one embodiment according to the present disclosure. [Diagram 5] 5 is a view taken along the arrow V in FIG. 4. [Figure 6] 4 is a flowchart showing the steps of a method for machining a workpiece according to an embodiment of the present disclosure. [Figure 7] FIG. 1 is a perspective view of a vertical lathe having a turning tool mounted thereon in one embodiment according to the present disclosure. [Figure 8] 1A to 1C are explanatory diagrams for explaining a dial gauge arrangement process and an installation angle inspection process in an embodiment according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a turning tool and a method for machining a workpiece using the turning tool according to the present disclosure will be described in detail with reference to the drawings.

[0013] "Embodiment of Turning Tool" An embodiment of a turning tool will be described with reference to Figs.

[0014] As shown in Figures 1 to 3, the turning tool T in this embodiment includes a shank 20 that can be attached to a tool mounting portion of a lathe, a tip 10 attached to the shank 20, and a tip mounting fixture 19 for attaching the tip 10 to the shank 20.

[0015] As shown in Figs. 4 and 5, the tip 10 has a cutting edge 17 extending linearly and an attachment portion 18 attached to the shank 20. Here, the direction in which the cutting edge 17 extends linearly is defined as the blade extension direction De. In addition, of both sides in the blade extension direction De, one side is defined as the first blade extension side De1, and the other side is defined as the second blade extension side De2. The tip 10 further has a rake face 11, a flank face 12, a first side flank face 12a, a second side flank face 12b, a first side surface 13a, a second side surface 13b, a back surface 14, an attachment surface 15, and an attachment screw hole 16. The rake face 11 and the attachment surface 15 are in a back-to-back relationship. The flank 12, the first flank 12a, the second flank 12b, the first side surface 13a, the second side surface 13b, and the back surface 14 are all surfaces that connect the rake face 11 and the mounting surface 15.

[0016] The flank 12 extends in a different direction relative to the rake face 11. The intersection of the flank 12 and the rake face 11 forms a cutting edge 17. The first side flank 12a is connected to the blade extension first side De1 of the flank 12. This first side flank 12a extends in a different direction relative to the rake face 11 and also extends in a different direction relative to the flank 12. The intersection of the first side flank 12a and the rake face 11 forms a first side cutting edge 17a. This first side cutting edge 17a extends in a direction that forms an obtuse angle with the cutting edge 17. The second side flank 12b is connected to the blade extension second side De2 of the flank 12. This second side flank 12b extends in a different direction relative to the rake face 11 and also extends in a different direction relative to the flank 12. The portion where the second flank 12b and the rake face 11 intersect forms a second cutting edge 17b. The second cutting edge 17b extends in a direction forming an obtuse angle with respect to the cutting edge 17.

[0017] The first side surface 13a is connected to the edge of the first side flank surface 12a on the blade extension first side De1. The second side surface 13b is connected to the edge of the second side flank surface 12b on the blade extension second side De2. The back surface 14 is connected to the edge of the rake face 11 on the opposite side to the part where the cutting edge 17 is formed. The first side surface 13a is connected to the edge of the first side De1 of the back surface 14. The second side surface 13b is connected to the edge of the second side De2 of the back surface 14.

[0018] The mounting screw hole 16 penetrates the tip 10 from the rake face 11 to the mounting surface 15. A tip mounting screw (see FIG. 1) serving as a tip mounting fixture 19 is inserted into this mounting screw hole 16.

[0019] The attached portion 18 is formed at a position spaced apart from the cutting edge 17 in a direction different from the blade extension direction De. More precisely, the attached portion 18 is formed at a position spaced apart from the cutting edge 17 in a direction perpendicular to the blade extension direction De, on the side where the back surface 14 exists relative to the cutting edge 17, among both sides in this direction. Here, the side where the cutting edge 17 exists relative to the back surface 14 is the work side Dw, and the side where the back surface 14 exists relative to the cutting edge 17 is the anti-work side Daw. The attached portion 18 has a portion of the rake face 11 on the anti-work side Daw, the first side surface 13a, the second side surface 13b, a portion of the attached surface 15 on the anti-work side Daw, the back surface 14, and an attachment screw hole 16.

[0020] 1 to 3, the shank 20 has a body portion 21 extending in a predetermined direction, and a head portion 31 provided on one side in the predetermined direction of the body portion 21. The head portion 31 has a tip attachment portion 32 and a shank-side rake face 38. The body portion 21 has a shank attached portion 22 and a workpiece facing surface 23.

[0021] The tip mounting portion 32 of the head portion 31 is a recess recessed from the shank side scooping surface 38 of the head portion 31. As shown in Figs. 4 and 5, the tip mounting portion 32 has a first side contact surface 33a capable of contacting the first side surface 13a of the tip 10, a second side contact surface 33b capable of contacting the second side surface 13b of the tip 10, a back contact surface 34 capable of contacting the back surface 14 of the tip 10, a mounted contact surface 35 capable of contacting the mounted surface 15 of the tip 10, and a female screw hole 36 into which a tip mounting screw as a tip mounting tool 19 can be screwed. The first side contact surface 33a, the second side contact surface 33b, and the back contact surface 34 form the side surfaces of the recess. The mounted contact surface 35 forms the bottom surface of the recess. The female screw hole 36 is recessed from the mounted contact surface 35. The surfaces 33a, 33b, 34, 35 of the tip mounting portion 32 are formed with high precision so that when the tip 10 is fitted into the tip mounting portion 32 and the surfaces 33a, 33b, 34, 35 of the tip mounting portion 32 come into contact with the corresponding surfaces 13a, 13b, 14, 15 of the tip 10, the orientation of the tip 10 relative to the shank 20 is set with high precision so as not to affect the machining precision of the workpiece W. In addition, when the tip 10 is fitted into the tip mounting portion 32 and the surfaces 33a, 33b, 34, 35 of the tip mounting portion 32 come into contact with the corresponding surfaces 13a, 13b, 14, 15 of the tip 10, the shank-side scooping surface 38 of the head portion 31 is formed to be flush with the scooping surface 11 of the tip 10.

[0022] As shown in FIG. 1 to FIG. 3, when the tip 10 is attached to the tip attachment portion 32 of the shank 20, the predetermined direction in which the body portion 21 extends coincides with the blade extension direction De. The body portion 21 is provided on the blade extension second side De2 of the head portion 31. The shank attachment portion 22 of the body portion 21 has a plurality of screw holes 22a. The tool attachment screw 29 is inserted into the screw insertion hole of the tool attachment portion of the lathe and screwed into the screw hole 22a of the shank attachment portion 22, so that the shank 20 is attached to the tool attachment portion of the lathe. The workpiece facing surface 23 of the body portion 21 is a surface facing the workpiece side Dw described above when the tip 10 is attached to the tip attachment portion 32. This workpiece facing surface 23 extends in the predetermined direction described above, in other words, in the blade extension direction De.

[0023] A reference surface 24 that is parallel to the cutting edge 17 is formed on the workpiece facing surface 23 when the tip 10 is attached to the tip attachment portion 32. This reference surface 24 has a first reference surface 24a and a second reference surface 24b that are spaced apart from each other in the blade extension direction De. The first reference surface 24a and the second reference surface 24b are located on a single imaginary plane that is parallel to the cutting edge 17.

[0024] Here, in the present disclosure, the reference surface 24 being parallel to the cutting edge 17 includes not only the case where the reference surface 24 is completely parallel to the cutting edge 17, but also the case where the parallelism of the reference surface 24 to the cutting edge 17 is equal to or less than the tolerance required for the straightness of the cutting edge 17 extending linearly in the blade extension direction De. The straightness is the magnitude of deviation of the target line from a geometrically correct straight line. The parallelism is the magnitude of deviation of the target line or target plane from a line or plane that is geometrically parallel to a reference line or plane. For example, if the tolerance required for the straightness of the cutting edge 17 is 5 / 1000 (mm), in the present disclosure, if the parallelism of the reference surface 24 to the cutting edge 17 is equal to or less than this tolerance (5 / 1000 (mm)), the reference surface 24 is considered to be parallel to the cutting edge 17.

[0025] The reference surface 24 is formed so as to be visually identifiable with respect to the surfaces of the workpiece opposing surface 23 other than the reference surface 24. Specifically, in this embodiment, the reference surface 24 is slightly recessed from the surfaces of the workpiece opposing surface 23 other than the reference surface 24.

[0026] Here, the length of the cutting edge 17 in the blade extension direction De is defined as the cutting edge width Wt. The distance from the end of the first blade extension side De1 to the end of the second blade extension side De2 on the reference surface 24, in other words, the distance Ws1 from the end of the first blade extension side De1 on the first reference surface 24a to the end of the second blade extension side De2 on the second reference surface 24b, is six times or more than the cutting edge width Wt. In addition, the interval Ws2 between the first reference surface 24a and the second reference surface 24b in the blade extension direction De is six times or more than the cutting edge width Wt.

[0027] "Embodiment of Workpiece Processing Method" An embodiment of the method for machining a workpiece will be described with reference to Figures 6 to 8. In this method for machining a workpiece, the turning tool T described above is used.

[0028] As shown in the flow chart of FIG. 6, in this machining method, first, a workpiece is placed on a workpiece placement section of a lathe (workpiece placement step S1).

[0029] Here, the lathe used in this embodiment will be described with reference to Fig. 7. This lathe 40 is a vertical lathe. This lathe 40 includes a first rail 41, a workpiece mounting section 42, a pair of columns 44, a second rail 45, a tool rest 46, a ram 47, and a tool mounting section 48.

[0030] The first rail 41 is provided on the lathe installation surface. This first rail 41 extends in a horizontal first direction Y. The workpiece installation part 42 is provided on the first rail 41 so as to be movable in the horizontal first direction Y. The workpiece installation part 42 has a rotating table 43 that is rotatable about a rotation axis Ar that extends in the vertical direction Z. The upper surface of the rotating table 43 extends in the horizontal direction.

[0031] The pair of columns 44 are disposed at an interval from each other in a horizontal second direction X perpendicular to the horizontal first direction Y. The above-mentioned first rail 41 and work placement section 42 are disposed between the pair of columns 44. The second rail 45 extends in the horizontal second direction X and is provided so as to span from one column 44 to the other column 44 of the pair of columns 44.

[0032] The tool rest 46 is attached to the second rail 45 so as to be movable in the second horizontal direction X. The ram 47 extends in the vertical direction Z. The ram 47 is attached to the tool rest 46 so as to be movable in the vertical direction Z. A tool attachment portion 48 is provided at the lower end of the ram 47. As described above, the turning tool T is attached to the tool attachment portion 48 by the tool attachment screw 29.

[0033] In the lathe 40 described above, the workpiece placement portion 42 is movable in the horizontal first direction Y. However, the pair of columns 44 may be movable in the horizontal first direction Y.

[0034] In the work setting step S1, the work W is set on the rotary table 43 of the work setting section 42 via a fixing jig or the like. The work W is, for example, a cylindrical turbine casing centered on the turbine axis. The part of the turbine casing to be machined by the lathe 40 is a flange surface at the end in the turbine axial direction and perpendicular to the turbine axis.

[0035] Next, the tip 10 is attached to the tip mounting portion 32 of the shank 20 (tip mounting step S2). In this tip mounting step S2, first, the tip 10 is fitted into the tip mounting portion 32, which is a recess of the shank 20, and the back surface 14 of the tip 10 is brought into contact with the back contact surface 34 of the tip mounting portion 32, the first side surface 13a of the tip 10 is brought into contact with the first side contact surface 33a of the tip mounting portion 32, the second side surface 13b of the tip 10 is brought into contact with the second side contact surface 33b of the tip mounting portion 32, and the attached surface 15 of the tip 10 is brought into contact with the attached contact surface 35 of the tip mounting portion 32. As a result, the cutting edge 17 of the tip 10 and the reference surface 24 of the shank 20 become parallel, and the rake surface 11 of the tip 10 becomes flush with the shank side rake surface 38. Thereafter, a tip mounting screw serving as a tip mounting fixture 19 is inserted into the mounting screw hole 16 of the tip 10, and this tip mounting screw is screwed into the female threaded hole 36 of the shank 20. With the above steps, the tip 10 is mounted to the tip mounting portion 32 of the shank 20.

[0036] Next, the turning tool T is attached to the tool mounting portion 48 of the lathe 40 (tool mounting step S3). This tool mounting step S3 includes a mounting angle adjustment step S4 for adjusting the mounting angle of the turning tool T with respect to the tool mounting portion 48 of the lathe 40. The mounting angle adjustment step S4 includes an actual mounting step S5, a dial gauge arrangement step S6, and a mounting angle inspection step S7.

[0037] In the actual mounting process S5, the turning tool T is mounted to the tool mounting portion 48 of the lathe 40 so that the blade extension direction De of the tip 10 coincides with the tool feed direction Dft during machining of the workpiece W. At this time, the tool mounting screw 29 is inserted into the screw insertion hole of the tool mounting portion 48 of the lathe 40, and this tool mounting screw 29 is screwed into the screw hole 22a of the shank mounting portion 22, thereby mounting the turning tool T to the tool mounting portion 48 of the lathe 40.

[0038] In the execution of this actual mounting step S5, the blade extension direction De of the tip 10 in the turning tool T attached to the tool mounting part 48 almost coincides with the tool feed direction Dft. However, there is play between the turning tool T and the tool mounting part 48, between the turning tool T and the tool mounting screw 29, and between the tool mounting screw 29 and the tool mounting part 48. For this reason, the blade extension direction De of the tip 10 in the turning tool T attached to the tool mounting part 48 does not necessarily coincide exactly with the tool feed direction Dft. If the workpiece W is turned in a state in which the blade extension direction De of the tip 10 does not coincide exactly with the tool feed direction Dft, for example, the machining accuracy decreases, such as the flatness of the machined surface of the workpiece W decreases.

[0039] Therefore, in this embodiment, after the actual mounting step S5, a dial gauge arrangement step S6 and a mounting angle inspection step S7 are performed.

[0040] In the dial gauge arrangement step S6, as shown in Fig. 8, the dial gauge 50 is arranged so that the measuring element 51 of the dial gauge 50 contacts the reference surface 24 of the shank 20. In this case, the dial gauge 50 may be placed directly on the workpiece W placed on the workpiece placement section 42 in the workpiece placement step S1, or a stage may be placed on the workpiece W and the dial gauge 50 may be placed on the stage. Furthermore, a stage may be placed on the workpiece placement section 42 and the dial gauge 50 may be placed on the stage. In other words, the dial gauge 50 may be arranged in any manner as long as the measuring element 51 of the dial gauge 50 can be brought into contact with the reference surface 24 of the shank 20.

[0041] In the mounting angle inspection process S7, the tool rest 46 of the lathe 40 is moved along the first rail 41 to feed the turning tool T attached to the lathe 40 in the tool feed direction Dft, and the detection value of the dial gauge 50 at that time is read. At this time, the detection value when the probe 51 of the dial gauge 50 is in contact with the first reference surface 24a and the detection value when the probe 51 of the dial gauge 50 is in contact with the second reference surface 24b are read. Then, it is determined whether the deviation width Vw between the two detection values ​​is within a predetermined tolerance. The tolerance here is a tolerance (for example, 5 / 1000 (mm)) required for the straightness of the cutting edge 17 extending linearly in the cutting edge extension direction De.

[0042] If the run-out width Vw between the two detection values ​​is within the tolerance, the path of the cutting edge 17 generated when the turning tool T is fed in the tool feed direction Dft is treated as being parallel to the reference surface 24 of the turning tool T. In other words, if the run-out width Vw between the two detection values ​​is within the tolerance, the blade extension direction De of the cutting edge 17 is treated as accurately matching the tool feed direction Dft. On the other hand, if the run-out width Vw between the two detection values ​​is not within the tolerance, the blade extension direction De of the cutting edge 17 is treated as not accurately matching the tool feed direction Dft.

[0043] FIG. 8 is a diagram illustrating an extreme case where the fluctuation width Vw between the two detection values ​​is not within the allowable range and the blade extension direction De of the blade tip 17 does not coincide with the tool feed direction Dft.

[0044] If the runout width Vw between the two detection values ​​is not within the tolerance in this mounting angle inspection process S7, the turning tool T is removed from the tool mounting portion 48, and the actual mounting process S5 and the mounting angle inspection process S7 are executed again. That is, the actual mounting process S5 and the mounting angle inspection process S7 are repeatedly executed until it is determined in the mounting angle inspection process S7 that the runout width Vw between the two detection values ​​is within the tolerance.

[0045] If it is determined in the mounting angle inspection process S7 that the deviation width Vw between the two detection values ​​is within the allowable value, the tool mounting process S3 is completed.

[0046] When the tool mounting step S3 is completed, the lathe 40 is driven to rotate the workpiece W, and the turning tool T is moved in the tool feed direction Dft while turning the workpiece W with the turning tool T (turning step S8).

[0047] This completes the turning of the workpiece W.

[0048] There are cases where the tip 10 needs to be replaced during turning of the workpiece W. Also, there are cases where the tip 10 needs to be replaced when turning a new workpiece W after turning of the workpiece W is completed. In such a case, the tip 10 attached to the shank 20 may be replaced with a new tip 10 without removing the shank 20 from the tool mounting portion 48 of the lathe 40. In this way, by replacing the tip 10 attached to the shank 20 with a new tip 10 without removing the shank 20 from the tool mounting portion 48 of the lathe 40, the mounting angle adjustment step S4 can be omitted even when the tip 10 is replaced.

[0049] As described above, in the mounting angle adjustment step S4, the mounting angle of the turning tool T relative to the tool mounting portion 48 of the lathe 40 can be objectively adjusted by referring to the reference surface 24 of the shank 20. Therefore, in the present embodiment, even a less skilled worker can quickly mount the shank 20 on the tool mounting portion 48 of the lathe 40 so that the direction in which the cutting edge 17 of the tip 10 extends faces the desired direction. Therefore, in the present embodiment, even a less skilled worker can improve the machining accuracy of the machined surface of the workpiece W.

[0050] In addition, in this embodiment, the reference surface 24 is visually identifiable with respect to surfaces of the workpiece opposing surface 23 other than the reference surface 24, so that the worker can easily identify which part of the workpiece opposing surface 23 is the reference surface 24.

[0051] In order for an operator to recognize the mounting angle of the turning tool T relative to the tool mounting portion 48 of the lathe 40, it is necessary to refer to two locations spaced apart in the blade extension direction De on the reference surface 24. Since the reference surface 24 of this embodiment has a first reference surface 24a and a second reference surface 24b spaced apart from each other in the blade extension direction De, the operator can easily recognize these two locations.

[0052] In this embodiment, the distance Ws2 between the first reference surface 24a and the second reference surface 24b in the blade extension direction De is five times or more the width in the blade extension direction De of the cutting edge 17. Therefore, in this embodiment, by referring to the first reference surface 24a and the second reference surface 24b, the worker can recognize the mounting angle of the turning tool T with respect to the tool mounting portion 48 of the lathe 40 with high accuracy.

[0053] The shank 20 of this embodiment has a shank-side rake face 38 that is flush with the rake face 11 of the tip 10 when the tip 10 is attached. Therefore, in this embodiment, turning chips, which are parts of the workpiece W turned by the cutting edge 17 of the tip 10, can be smoothly sent from the rake face 11 of the tip 10 to the shank-side rake face 38 of the shank 20. Therefore, in this embodiment, the turning chips can be efficiently discharged.

[0054] "Variations" In the above embodiment, the reference surface 24 is slightly recessed from the surfaces excluding the reference surface 24 in the workpiece facing surface 23 so that the reference surface 24 can be visually distinguished from the surfaces excluding the reference surface 24 in the workpiece facing surface 23. However, in order to make the reference surface 24 visually distinguishable, the surface roughness or light reflectance of the reference surface 24 and the surfaces excluding the reference surface 24 in the workpiece facing surface 23 may be different, or the color of the reference surface 24 may be different from the surfaces excluding the reference surface 24 in the workpiece facing surface 23.

[0055] The reference surface 24 in the above embodiment has a first reference surface 24a and a second reference surface 24b. However, the reference surface 24 may be formed of only one surface. In this case, it is preferable that the distance from the end of the first blade extension side De1 to the end of the second blade extension side De2 in the one reference surface is six times or more the width of the cutting edge 17 in the blade extension direction De. In this case, the operator can recognize the mounting angle of the turning tool T with respect to the tool mounting portion 48 of the lathe 40 with high accuracy by referring to the part of the first blade extension side De1 and the part of the second blade extension side De2 in the one reference surface.

[0056] In the above embodiment, the workpiece setting step S1 is performed before the tip mounting step S2 and the tool mounting step S3. However, if the workpiece setting step S1 is performed before the turning step S8, the workpiece setting step S1 may be performed after the tip mounting step S2 and the tool mounting step S3.

[0057] In the above embodiment, the accuracy of the attachment direction of the tip 10 to the shank 20 is ensured by bringing the first side surface 13a, the second side surface 13b, the back surface 14, and the attached surface 15, which are four of the outer surfaces of the tip 10 excluding the flank surface 12 and the rake surface 11, into contact with the corresponding surfaces 33a, 33b, 14, and 35 of the tip attachment portion 32. However, the three outer surfaces of the tip 10 excluding the flank surface 12 and the rake surface 11 may be brought into contact with the corresponding surfaces of the tip attachment portion 32. For example, only the three outer surfaces of the first side surface 13a, the second side surface 13b, and the attached surface 15 may be brought into contact with the corresponding surfaces of the tip attachment portion 32, or only the three outer surfaces of the first side surface 13a, the back surface 14, and the attached surface 15 may be brought into contact with the corresponding surfaces of the tip attachment portion 32. However, the three outer surfaces need to extend in directions intersecting each other.

[0058] The present disclosure is not limited to the embodiments and modifications described above. Various additions, modifications, substitutions, partial deletions, etc. are possible within the scope of the conceptual idea and intent of the present invention derived from the contents defined in the claims and their equivalents.

[0059] "Additional Notes" The turning tools in the above-described embodiment and modified examples can be understood, for example, as follows.

[0060] (1) In a first aspect, the turning tool comprises: The tool includes a shank 20 that can be attached to a tool attachment portion 48 of a lathe 40, and a tip 10 attached to the shank 20. The tip 10 has a cutting edge 17 extending linearly, and a mounting portion 18 that is formed at a position spaced apart from the cutting edge 17 in a direction different from the blade extension direction De in which the cutting edge 17 extends, and is attached to the shank 20. The shank 20 has a tip attachment portion 32 to which the tip 10 is attached, and a work-facing surface 23 that faces a work side Dw, which is one side in a direction different from the blade extension direction De and is the side on which the cutting edge 17 exists with respect to the mounting portion 18 of the tip 10, when the tip 10 is attached to the tip attachment portion 32. The work-facing surface 23 has a reference surface 24 that is parallel to the cutting edge 17 that extends linearly in the blade extension direction De when the tip 10 is attached to the tip attachment portion 32.

[0061] In this embodiment, the mounting angle of the turning tool T relative to the tool mounting portion 48 of the lathe 40 can be objectively adjusted by referring to the reference surface 24 of the shank 20. Therefore, in this embodiment, even a less skilled worker can quickly mount the shank 20 on the tool mounting portion 48 of the lathe 40 so that the direction in which the cutting edge 17 of the tip 10 extends faces the desired direction. Therefore, in this embodiment, even a less skilled worker can improve the machining accuracy of the machined surface of the workpiece W.

[0062] (2) In the second aspect, the turning tool is In the turning tool T in the first embodiment, the reference surface 24 is visually distinguishable from the surfaces of the workpiece opposing surface 23 other than the reference surface 24 .

[0063] In this embodiment, the worker can easily identify which part of the workpiece facing surface 23 is the reference surface 24.

[0064] (3) In a third aspect, the turning tool is In the turning tool T in the first or second embodiment, the distance Ws1 from the end of the first blade extension side De1 to the end of the second blade extension side De2 on both sides in the blade extension direction De on the reference surface 24 is six times or more the width of the cutting edge 17 in the blade extension direction De.

[0065] In this embodiment, a distance Ws1 from an end of the first blade extension side De1 to an end of the second blade extension side De2 on the reference surface 24 is six times or more the width in the blade extension direction De of the cutting edge 17. Therefore, in this embodiment, by referring to the portion of the first blade extension side De1 and the portion of the second blade extension side De2 on the reference surface 24, an operator can recognize with high accuracy the mounting angle of the turning tool T with respect to the tool mounting portion 48 of the lathe 40.

[0066] (4) In a fourth aspect, the turning tool is In the turning tool T according to the first or second embodiment, the reference surface 24 has a first reference surface 24a and a second reference surface 24b spaced apart from each other in the blade extension direction De. The first reference surface 24a and the second reference surface 24b are located on a virtual plane parallel to the cutting edge 17.

[0067] In order for an operator to recognize the mounting angle of the turning tool T relative to the tool mounting portion 48 of the lathe 40, it is necessary to refer to two points spaced apart in the blade extension direction De on the reference surface 24. In this embodiment, the operator can easily recognize these two points.

[0068] (5) In a fifth aspect, the turning tool comprises: In the turning tool T of the fourth embodiment, the distance Ws2 between the first reference surface 24a and the second reference surface 24b in the blade extension direction De is five times or more the width of the cutting edge 17 in the blade extension direction De.

[0069] In this embodiment, the distance Ws2 between the first reference surface 24a and the second reference surface 24b in the blade extension direction De is five times or more the width in the blade extension direction De of the cutting edge 17. Therefore, in this embodiment, the operator can recognize the mounting angle of the turning tool T with respect to the tool mounting portion 48 of the lathe 40 with high accuracy by referring to the first reference surface 24a and the second reference surface 24b.

[0070] (6) In a sixth aspect, the turning tool comprises: In the turning tool T according to any one of the first to fifth embodiments, the tip 10 has a flank 12 and a rake face 11. The intersection of the flank 12 and the rake face 11 forms the cutting edge 17. The shank 20 has a shank-side rake face 38 that is flush with the rake face 11 of the tip 10 when the tip 10 is attached.

[0071] In this embodiment, the turning chips, which are the parts of the workpiece W turned by the cutting edge 17 of the tip 10, can be smoothly sent from the rake face 11 of the tip 10 to the shank-side rake face 38 of the shank 20. Therefore, in this embodiment, the turning chips can be efficiently discharged.

[0072] (7) In a seventh aspect, the turning tool comprises: In the turning tool T according to any one of the first to sixth embodiments, the tip 10 has a flank 12, a cutting face 11, and at least three faces excluding the flank 12 and the cutting face 11, which extend in directions intersecting with each other. The intersection of the flank 12 and the cutting face 11 forms the cutting edge 17. The shank 20 has a tip attachment portion 32 having a surface capable of contacting each of the at least three faces of the tip 10.

[0073] In this embodiment, when the tip 10 is attached to the tip attachment portion 32 of the shank 20, the surfaces forming the tip attachment portion 32 of the shank 20 are brought into contact with at least three surfaces of the tip 10. As a result, in this embodiment, with the tip 10 attached to the tip attachment portion 32, the parallelism of the reference surface 24 of the shank 20 can be ensured with respect to the cutting edge 17 extending linearly in the blade extension direction De.

[0074] Furthermore, the workpiece machining methods in the above-described embodiments and modified examples can be understood, for example, as follows.

[0075] (8) In an eighth aspect, a method for machining a workpiece comprises: In a method for machining a workpiece W using a turning tool T in any one of the first to seventh embodiments, the following steps are executed: a workpiece mounting step S1 for mounting the workpiece W on a workpiece mounting portion 42 of the lathe 40, which is rotatable around an axis Ar; a tip mounting step S2 for attaching the tip 10 to the shank 20; a tool mounting step S3 for mounting the turning tool T after the tip mounting step S2 to the tool mounting portion 48 of the lathe 40 so that the blade extension direction De coincides with the tool feed direction Dft; and a turning step S8 for turning the workpiece W with the turning tool T by driving the lathe 40 after the workpiece mounting step S1 and the tool mounting step S3, while moving the turning tool T in the tool feed direction Dft. The tool mounting process S3 includes an attachment angle adjustment process S4 for adjusting the attachment angle of the turning tool T relative to the tool mounting portion 48 so that the trajectory of the cutting edge 17 generated when the turning tool T is sent in the tool feed direction Dft is parallel to the reference surface 24 of the turning tool T.

[0076] In the mounting angle adjustment step S4 of this embodiment, the mounting angle of the turning tool T relative to the tool mounting portion 48 of the lathe 40 can be objectively adjusted by referring to the reference surface 24 of the shank 20. Therefore, in this embodiment, even a less skilled worker can quickly mount the shank 20 on the tool mounting portion 48 of the lathe 40 so that the direction in which the cutting edge 17 of the tip 10 extends faces the desired direction. Therefore, in this embodiment, even a less skilled worker can improve the machining accuracy of the machined surface of the workpiece W.

[0077] (9) A method for machining a workpiece in a ninth aspect includes the steps of: In the eighth embodiment of the workpiece machining method, the mounting angle adjustment step S4 includes an actual mounting step S5 of mounting the turning tool T after the tip mounting step S2 to the tool mounting portion 48 of the lathe 40, a dial gauge arrangement step S6 of arranging the dial gauge 50 so that the probe 51 of the dial gauge 50 contacts the reference surface 24 of the shank 20 of the turning tool T after the actual mounting step S5, and a mounting angle inspection step S7 of feeding the turning tool T in the tool feed direction Dft after the dial gauge arrangement step S6 and inspecting whether the swing width Vw of the detection value by the dial gauge 50 is within a predetermined allowable value. If it is determined in the mounting angle inspection step S7 that the swing width Vw is not within the allowable value, the turning tool T is removed from the tool mounting portion 48, and the actual mounting step S5 and the mounting angle inspection step S7 are executed again.

[0078] (10) A method for machining a workpiece in a tenth aspect includes the steps of: In the workpiece machining method in the eighth or ninth aspect, when it becomes necessary to replace the tip 10, the tip 10 attached to the shank 20 of the turning tool T is replaced with a new tip 10 without removing the shank 20 from the tool mounting portion 48 of the lathe 40.

[0079] In this embodiment, when it becomes necessary to replace the tip 10, the tip 10 attached to the shank 20 of the turning tool T is replaced with a new tip 10 without removing the shank 20 from the tool attachment portion 48 of the lathe 40. Therefore, in this embodiment, even if the tip 10 is replaced, the attachment angle adjustment step S4 can be omitted. [Explanation of symbols]

[0080] 10: Tip 11: Scooping surface 12: Flank 12a: First side flank 12b: Second side flank 13a: First side 13b:Second side 14: Back 15: Mounting surface 16: Mounting screw hole 17: Edge 17a: First cutting edge 17b: Second side cutting edge 18: Mounting part 19: Tip mounting fixture 20: Shank 21: Torso 22: Shank mounting part 22a: screw hole 23: Workpiece facing surface 24:Reference plane 24a: First reference plane 24b: Second reference plane 29: Tool mounting screw 31: Head section 32: Tip attachment part 33a: First side contact surface 33b: Second side contact surface 34: Back contact surface 35: Mounting contact surface 36: Female thread hole 38: Shank side rake face 40: Lathe 41: First Rail 42: Workpiece placement section 43: Rotating table 44: Column 45: Second Rail 46: Tool holder 47: Ram 48: Tool attachment part 50: Dial gauge 51: Probe Ar: Rotation axis De: Blade extension direction De1: Blade extension first side De2: Blade extension second side Dw: Work side Daw: Opposite work side Dft: Tool feed direction X: Horizontal second direction Y: Horizontal first direction Z: Vertical direction T: Turning tool W: Work

Claims

1. A shank that can be attached to the tool attachment part of a lathe; a tip attached to the shank; Equipped with The tip has a cutting edge extending linearly, and a mounting portion formed at a position spaced from the cutting edge in a direction different from a blade extension direction in which the cutting edge extends, and is mounted to the shank, The shank has a tip attachment portion to which the tip is attached, a work-facing surface that faces the work side, which is one side in a direction different from the blade extension direction and is the side on which the cutting edge is present with respect to the attached portion of the tip when the tip is attached to the tip attachment portion, and a reference surface that is parallel to the cutting edge and extends linearly in the blade extension direction when the tip is attached to the tip attachment portion. Turning tools.

2. 2. The turning tool according to claim 1, The reference surface is present in the workpiece facing surface, The reference surface is visually identifiable with respect to a surface other than the reference surface in the workpiece opposing surface. Turning tools.

3. 2. The turning tool according to claim 1, On the reference surface, the distance from the end of the first side of the blade extension to the end of the second side of the blade extension is six times or more the width of the blade tip in the blade extension direction. Turning tools.

4. 2. The turning tool according to claim 1, The reference surface includes a first reference surface and a second reference surface spaced apart from each other in the blade extension direction, The first reference surface and the second reference surface are located on a virtual plane parallel to the cutting edge. Turning tools.

5. 5. The turning tool according to claim 4, A distance between the first reference surface and the second reference surface in the blade extension direction is 5 times or more the width of the blade tip in the blade extension direction. Turning tools.

6. A turning tool according to any one of claims 1 to 5, The tip has a flank and a rake face, and a portion where the flank and the rake face intersect forms the cutting edge; The shank has a shank-side rake surface that is flush with the rake surface of the tip when the tip is attached. Turning tools.

7. A turning tool according to any one of claims 1 to 5, The tip has a flank, a rake face, and at least three faces excluding the flank and the rake face, the faces extending in directions intersecting each other, The cutting edge is formed at an intersection of the flank and the rake face, the shank has a tip attachment portion having a surface capable of contacting each of the at least three surfaces of the tip; Turning tools.

8. A method for machining a workpiece using the turning tool according to any one of claims 1 to 5, a workpiece setting step of setting a workpiece on a workpiece setting portion of the lathe rotatable about an axis; a tip attachment step of attaching the tip to the shank; a tool mounting step of mounting the turning tool after the tip mounting step on the tool mounting portion of the lathe so that the blade extension direction coincides with the tool feed direction; a turning step of turning the workpiece with the turning tool by driving the lathe after the workpiece setting step and the tool mounting step, while moving the turning tool in the tool feed direction; Run the tool mounting step includes a mounting angle adjustment step of adjusting a mounting angle of the turning tool with respect to the tool mounting portion so that a path of the cutting edge generated when the turning tool is fed in the tool feed direction is parallel to the reference surface of the turning tool. Method of machining the workpiece.

9. The method for machining a workpiece according to claim 8, The mounting angle adjustment step includes: an actual mounting step of mounting the turning tool after the tip mounting step on the tool mounting portion of the lathe; a dial gauge arrangement step of arranging the dial gauge so that a measuring point of the dial gauge contacts the reference surface of the shank of the turning tool after the actual mounting step; a mounting angle inspection step of inspecting whether a fluctuation range of a detection value by the dial gauge is within a predetermined tolerance by feeding the turning tool in the tool feed direction after the dial gauge arrangement step; Including, When it is determined in the mounting angle inspection step that the runout width is not within the allowable range, the turning tool is removed from the tool mounting portion, and then the actual mounting step and the mounting angle inspection step are performed again. Method of machining the workpiece.

10. The method for machining a workpiece according to claim 8, When it becomes necessary to replace the tip, the tip attached to the shank of the turning tool is replaced with a new tip without removing the shank from the tool attachment portion of the lathe. Method of machining the workpiece.

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