Cutting tool and method for manufacturing cut product

Abstract

The present invention improves durability of a shank while ensuring high detection accuracy of a sensor unit. The unit base is disposed from the lower surface to the second side surface, and the unit base is L-shaped in a cross section orthogonal to the longitudinal direction of the shank. A first sensor located in a first recess of the unit base abuts against the lower surface. A second sensor located in a second recess of the unit base abuts against the second side surface.

Description

Technical Field

[0001] The present disclosure relates to a cutting tool used for cutting a workpiece and a method for producing a cut product. Background Art

[0002] As a cutting tool used in cutting a workpiece for manufacturing a cutting object, for example, there is known a cutting tool described in Patent Document 1. The cutting tool described in Patent Document 1 includes a sensor portion for detecting a physical quantity (referred to as physical information in Patent Document 1) of a cutting insert (referred to as a cutting edge in Patent Document 1). As the physical quantity, wear, temperature, pressure, and vibration of the cutting insert are exemplified, and a cutting tool provided with a temperature sensor is disclosed as an embodiment.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Publication No. 2012-020359 Summary of the invention

[0006] The cutting tool disclosed in the present invention comprises a tool holder, a cutting blade and a sensor unit. The tool holder is in the shape of a rod extending from the front end toward the rear end, and has: a front end face, which is located on the side of the front end; an upper surface, which extends from the front end face toward the rear end; a lower surface, which is located on the opposite side of the upper surface; a first side surface, which is located between the upper surface and the lower surface and extends from the front end face toward the rear end; a second side surface, which is located on the opposite side of the first side surface; and a tool groove, which is open on the front end face, the upper surface and the first side surface. The cutting blade is located in the tool groove and has a cutting edge. The sensor unit has a unit base, a first sensor and a second sensor. The unit base is configured from the lower surface to the second side surface, and has a first recessed portion opened toward the lower surface and a second recessed portion opened toward the second side surface, and is L-shaped in a cross section orthogonal to the length direction of the tool holder. The first sensor is located in the first recessed portion, abuts against the lower surface, and detects the physical quantity of the tool holder (cutting tool). The second sensor is located in the second recessed portion, abuts against the second side surface, and detects the physical quantity of the tool holder (cutting tool) in a detection direction orthogonal to the detection direction of the first sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic perspective view of a cutting tool according to an embodiment of the present disclosure.

[0008] Figure 2 Observe from another angle Figure 1 A schematic perspective view of the cutting tool shown.

[0009] Figure 3 yes Figure 1 A schematic top view of a cutting tool is shown.

[0010] Figure 4 Viewed from the front side Figure 1 Schematic diagram of the cutting tool shown.

[0011] Figure 5 yes Figure 1 A schematic side view of a cutting tool is shown.

[0012] Figure 6 Yes Figure 5 The illustrated cutting tool is a schematic enlarged view of another side surface.

[0013] Figure 7 It is along Figure 5 Cross-sectional view along line VII-VII.

[0014] Figure 8 It is along Figure 5 Cross-sectional view along line VIII-VIII in FIG.

[0015] Fig. 9 It is along Figure 5 Cross-sectional view along line IX-IX.

[0016] Fig.10 It is a schematic perspective view of a cutting tool according to another embodiment of the present disclosure.

[0017] Fig.11 yes Fig.10 A schematic side view of a cutting tool is shown.

[0018] Fig.12 It is a schematic perspective view of a cutting tool according to another embodiment of the present disclosure.

[0019] Fig.13 Viewed from the front side Fig.12 Schematic diagram of the cutting tool shown.

[0020] Fig.14 It is a schematic diagram for explaining the method for producing a machined product according to an embodiment of the present disclosure.

[0021] Fig.15 It is a schematic diagram for explaining the method for producing a machined product according to an embodiment of the present disclosure.

[0022] Fig.16 It is a schematic diagram for explaining the method for producing a machined product according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] In the cutting tool described in Patent Document 1, the sensor portion is attached near the cutting edge of the cutting insert. Therefore, there is a possibility that the sensor portion may fall off from the cutting insert during cutting of a workpiece.

[0024] In order to avoid the sensor part from falling off, it is also considered to build the sensor part into the tool holder of the cutting tool. In the case where the sensor part is a temperature sensor, the sensor part is small, so the possibility of a significant reduction in the strength of the tool holder is small. However, in the case where the sensor part is a pressure sensor or a vibration sensor, the reduction in the strength (rigidity) of the tool holder caused by the built-in sensor part cannot be ignored.

[0025] In particular, during cutting, cutting loads in three directions, namely, main force component, back force component, and feed force component, are applied to the cutting tool. In order to ensure high detection accuracy of the sensor unit, when detecting physical quantities such as acceleration in three directions corresponding to the three cutting loads, the sensor unit needs to have a plurality of sensors corresponding to the three directions. If a space for such a sensor unit is provided in the tool holder, the processing of the tool holder becomes complicated, and there is a concern that the durability of the tool holder may be reduced.

[0026] According to the present disclosure, it is possible to improve the durability of the tool holder while ensuring high detection accuracy of the sensor unit.

[0027] Hereinafter, the cutting tool and the manufacturing method of the cut workpiece of the embodiment of the present disclosure are described in detail using the accompanying drawings. However, for the convenience of description, the following referenced figures only simplify and show the components required for describing the embodiment. Therefore, the cutting blade of the embodiment of the present disclosure can have any components not shown in the referenced figures. The dimensions of the components in the figures do not accurately represent the dimensions of the actual components and the dimensional ratios of the components.

[0028] In addition, in the present disclosure, the description is based on the orthogonal coordinate system XYZ defined by three mutually orthogonal directions. The X direction refers to the front-to-back direction, one side of the X direction is the front side or the front direction, and the other side of the X direction is the rear side or the rear direction. The Y direction refers to the left-to-right direction, one side of the Y direction is the left side or the left direction, and the other side of the Y direction is the right side or the right direction. The Z direction refers to the up-down direction, one side of the Z direction is the upper side or the upper direction, and the other side of the Z direction is the lower side or the lower direction. The XY direction refers to the two directions of the X direction and the Y direction, the XZ direction refers to the two directions of the X direction and the Z direction, and the YZ direction refers to the two directions of the Y direction and the Z direction. The XYZ direction refers to the three directions of the X direction, the Y direction, and the Z direction.

[0029] In the drawings, “FF” means a front direction, “FR” means a rear direction, “L” means a left direction, “R” means a right direction, “U” means an upper direction, and “D” means a lower direction.

[0030] <Cutting tools>

[0031] Reference Figures 1 to 9 A cutting tool 10 according to an embodiment of the present disclosure will be described. Figure 1 1 is a schematic perspective view of a cutting tool 10 according to an embodiment of the present disclosure. Figure 2 Observe from another angle Figure 1 A schematic perspective view of the cutting tool shown. Figure 3 yes Figure 1 A schematic top view of a cutting tool 10 is shown. Figure 4 Viewed from the front side Figure 1 A schematic diagram of the cutting tool 10 is shown. Figure 5 yes Figure 1 A schematic side view of a cutting tool 10 is shown. Figure 6 It is from Figure 5 This is an enlarged side view of the vicinity of the sensor unit when viewed from the opposite side. Figure 7 It is along Figure 5 Cross-sectional view along line VII-VII. Figure 8 It is along Figure 5 Cross-sectional view along line VIII-VIII in FIG. Fig. 9 It is along Figure 5 Cross-sectional view along line IX-IX.

[0032] like Figures 1 to 3 As shown in the example, the cutting tool 10 of the embodiment of the present disclosure is a workpiece W (refer to Fig.10 ). The cutting process of the workpiece W includes outer diameter processing, inner diameter processing, grooving processing, and cutting processing. In addition, the cutting tool 10 may also include a tool holder 14 mounted on a tool holder 12 of a lathe, a cutting blade 16 held by the tool holder 14, a clamping member 18 for fixing the cutting blade 16 relative to the tool holder 14, and a clamping screw 20 for mounting the clamping member 18 on the tool holder 14.

[0033] like Figures 1 to 5 As shown in the example, the handle 14 may be a rod-shaped structure extending from the front end 14a toward the rear end 14b along the X direction. The length direction of the handle 14 may also be the X direction. The handle 14 may also have a quadrangular columnar main body 14m located closer to the rear end 14b than the clamp 18.

[0034] like Figures 1 to 5As shown in the example, the handle 14 may also have a front end face 22 located on the side of the front end 14a and a rear end face 24 located on the opposite side of the front end face 22. The handle 14 may also have an upper surface 26 extending from the front end face 22 toward the rear end 14b along the X direction to the rear end face 24. The handle 14 may also have a lower surface 28 located on the opposite side of the upper surface 26, and the lower surface 28 may also extend from the front end face 22 toward the rear end 14b along the X direction to the rear end face 24.

[0035] The handle 14 may also have a first side surface 30 located between the upper surface 26 and the lower surface 28, and the first side surface 30 may also extend from the front end surface 22 toward the rear end 14b along the X direction to the rear end surface 24. The first side surface 30 of the handle 14 may also be connected to the upper surface 26 and the lower surface 28. In the main body 14m of the handle 14, the first side surface 30 may also be orthogonal to the lower surface 28 and the upper surface 26.

[0036] The handle 14 may also have a second side surface 32 located on the opposite side of the first side surface 30, and the second side surface 32 may also extend from the front end surface 22 toward the rear end 14b along the X direction to the rear end surface 24. The second side surface 32 of the handle 14 may also be connected to the upper surface 26 and the lower surface 28. In the main body 14m of the handle 14, the second side surface 32 may also be orthogonal to the lower surface 28 and the upper surface 26.

[0037] The front end face 22, the rear end face 24, the upper surface 26, the lower surface 28, the first side surface 30 and the second side surface 32 of the tool holder 14 may also constitute the outer surface of the tool holder 14. In addition, the tool holder 14 may also have a groove 34 on the front end 14a side for holding the cutting blade 16. The groove 34 may also be open on the front end face 22, the upper surface 26 and the first side surface 30.

[0038] When the cutting tool 10 is mounted on the tool holder 12, the lower surface 28 of the main body portion 14m of the shank 14 is supported on the mounting surface 12a of the tool holder 12 (see Figure 8 The second side surface 32 of the main body portion 14m of the shank 14 is supported by the inner wall surface 12b of the tool holder 12 (see Figure 8 The upper surface 26 of the main body 14m of the shank 14 is fixed by the fixing screw 12c of the tool holder 12 (see Figure 8 ) Press.

[0039] Examples of the material of the handle 14 include metals such as stainless steel, carbon steel, cast iron, and aluminum alloy. The length of the handle 14 may be set to, for example, 100 mm to 400 mm.

[0040] like Figures 1 to 5As shown in the example, the cutting blade 16 can also be located at the knife groove 34 of the handle of a knife 14. The cutting blade 16 can also be a replaceable blade that is called a non-regrinding blade. The cutting blade 16 can also be in a square plate shape, and can also be in a triangular plate shape or a pentagonal plate shape other than the square plate shape. The cutting blade 16 can also have a first blade face 36, a second blade face 38 located on the opposite side of the first blade face 36, and a plurality of blade side faces 40 located between the first blade face 36 and the second blade face 38.

[0041] The cutting insert 16 may have a cutting edge 42 at the boundary between the first insert face 36 and the insert side face 40. The first insert face 36 may function as a rake face for flowing the chips. The insert side face 40 may function as a flank face.

[0042] The cutting insert 16 may include through holes 44 that open in the first blade face 36 and the second blade face 38. The cutting insert 16 is attached to the slit 34 by tightening the clamp screw 20 with the front end of the clamp 18 locked in the through hole 44.

[0043] As the material of the cutting blade 16, for example, cemented carbide or cermet can be cited. As the composition of cemented carbide, for example, WC-Co, WC-TiC-Co and WC-TiC-TaC-Co can be cited. WC-Co is produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering. WC-TiC-Co is obtained by adding titanium carbide (TiC) to WC-Co. WC-TiC-TaC-Co is obtained by adding tantalum carbide (TaC) to WC-TiC-Co. In addition, cermet is a sintered composite material obtained by compounding metal in a ceramic component. Specifically, as cermet, cermet with titanium compounds such as titanium carbide (TiC) and titanium nitride (TiN) as the main component can be cited.

[0044] The surface of the cutting insert 16 may be coated with a coating by chemical vapor deposition (CVD) or physical vapor deposition (PVD). Examples of the coating material include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and aluminum oxide (Al2O3).

[0045] like Figures 2 to 7As shown in the example, the cutting tool 10 may also include a sensor unit 46 for detecting physical quantities such as acceleration, vibration, strain or internal stress of the shank 14 (cutting tool 10). The sensor unit 46 may also have a unit base 48 configured from the lower surface 28 of the main body 14m of the shank 14 to the second side surface 32. The unit base 48 may also be mounted on the main body 14m of the shank 14 using an adhesive. The unit base 48 may also be mounted on the main body 14m of the shank 14 using the magnetic force of a built-in magnet. In addition, the unit base 48 may also be mounted on the main body 14m of the shank 14 using a fixing member such as a screw. As the material of the unit base 48, for example, synthetic resin and metal can be cited.

[0046] like Figure 4 as well as Figure 7 As shown in the example, the unit base 48 may be L-shaped in a cross section perpendicular to the X direction, which is the length direction of the tool handle 14. In other words, the sensor unit 46 may be L-shaped in a cross section perpendicular to the X direction. The unit base 48 may have a first portion 48a located on the lower surface 28 of the tool handle 14 and a second portion 48b located on the second side surface 32 of the tool handle 14. The distance from the unit base 48 to the front end surface 22 of the tool handle 14 in the X direction may be shorter than the distance from the unit base 48 to the rear end surface 24 of the tool handle 14 in the X direction.

[0047] like Figure 4 As shown in the example, the entire first portion 48a of the unit base 48 may be located closer to the second side surface 32 than the first side surface 30 of the handle 14. The entire second portion 48b of the unit base 48 may be located closer to the lower surface 28 than the upper surface 26 of the handle 14.

[0048] like Figure 6 as well as Figure 7 As shown in the example, the first portion 48a of the unit base 48 may also have a first recess 50 that opens toward the lower surface 28 of the handle 14. The first recess 50 of the unit base 48 may be a hole with a bottom (depression) or a through hole. In the case where the first recess 50 of the unit base 48 is a hole with a bottom, the waterproof performance for the first sensor 56 and the like is easily improved. The second portion 48b of the unit base 48 may also have a second recess 52 that opens toward the second side surface 32 of the handle 14. The second recess 52 of the unit base 48 may be a hole with a bottom or a through hole.

[0049] The unit base 48 may also have another recess in addition to the first recess 50 and the second recess 52. For example, the first portion 48a of the unit base 48 may also have a recess opening toward the lower surface 28 of the handle 14 in addition to the second recess 52. Figure 6 as well as Figure 7 As shown in the example, the second portion 48b of the unit base 48 may also have a third recess 54 that opens toward the second side surface 32 of the shank 14. The third recess 54 of the unit base 48 may be a hole with a bottom or a through hole. The first recess 50, the second recess 52, and the third recess 54 in the unit base 48 may be independent of each other or may be continuous. For example, the first recess 50 of the unit base 48 may be independent of the second recess 52 and the third recess 54, and the third recess 54 of the unit base 48 may be continuous with the second recess 52.

[0050] The sensor unit 46 may also include a first sensor 56 located in the first recess 50 of the unit base 48. The first sensor 56 may also be fixed in the first recess 50 of the unit base 48 by means of an adhesive or the like. The first sensor 56 may also detect any one or more of the physical quantities such as acceleration, vibration, strain or internal stress of the tool holder 14. The detection direction of the first sensor 56 may also be the Y direction. In other words, the first sensor 56 may also detect physical quantities such as acceleration, vibration, strain or internal stress of the tool holder 14 in the Y direction. The first sensor 56 may also detect the acceleration of the tool holder 14 corresponding to the feed force component, etc. The first sensor 56 may also abut against the lower surface 28 of the tool holder 14. When the first sensor 56 abuts against the lower surface 28 of the tool holder 14, the accuracy associated with the detection of the above-mentioned physical quantities is improved.

[0051] The sensor unit 46 may also include a second sensor 58 located in the second recess 52 of the unit base 48. The second sensor 58 may also be fixed in the second recess 52 of the unit base 48 by using an adhesive or the like. The position of the second sensor 58 in the X direction may also be the same as the position of the first sensor 56 in the X direction. In other words, the position of the center of the second sensor 58 in the X direction may also be within the range of ±1 mm relative to the position of the center of the first sensor 56 in the X direction. The second sensor 58 may also abut against the second side surface 32 of the tool handle 14. The second sensor 58 may also abut against the second side surface 32 of the tool handle 14. When the second sensor 58 abuts against the second side surface 32 of the tool handle 14, the accuracy associated with the detection of the above-mentioned physical quantity is improved.

[0052] The second sensor 58 may also be in contact with the second side surface 32 of the tool handle 14. The second sensor 58 may also detect any one or more physical quantities such as acceleration, vibration, strain or internal stress of the tool handle 14. The second sensor 58 may also detect the same physical quantity as the first sensor 56. The detection direction of the second sensor 58 may also be the X direction orthogonal to the detection direction of the first sensor 56. In other words, the second sensor 58 may also detect physical quantities such as acceleration, vibration, strain or internal stress of the tool handle 14 in the X direction. The second sensor 58 may also detect the acceleration of the tool handle 14 corresponding to the back force, etc.

[0053] The cutting tool 10 of the present disclosure is not a structure in which sensors such as the first sensor 56 and the second sensor 58 are embedded in the tool holder 14, but a structure in which the sensor unit 46 is separate from the tool holder 14 and has a sensor. Therefore, there is no need to perform complicated processing for embedding the sensor inside the tool holder 14, and the existing tool holder 14 can be easily utilized.

[0054] The sensor unit 46 may also include a third sensor 60 located in the third recess 54 of the unit base 48. The third sensor 60 may also be fixed in the third recess 54 of the unit base 48 by using an adhesive or the like. The third sensor 60 may also abut against the second side surface 32 of the tool handle 14. The position of the third sensor 60 in the X direction may also be the same as the position of the second sensor 58 in the X direction. In other words, the position of the center of the third sensor 60 in the X direction may also be within the range of ±1 mm relative to the position of the center of the second sensor 58 in the X direction.

[0055] The third sensor 60 may also detect any one or more physical quantities such as acceleration, vibration, strain, or internal stress of the tool handle 14. The third sensor 60 may also detect the same physical quantity as the first sensor 56 and the second sensor 58. The detection direction of the third sensor 60 may also be the Z direction orthogonal to the detection directions of the first sensor 56 and the second sensor 58. In other words, the third sensor 60 may also detect physical quantities such as acceleration, vibration, strain, or internal stress of the tool handle 14 in the Z direction. The third sensor 60 may also detect the acceleration of the tool handle 14 corresponding to the main component force.

[0056] The first sensor 56, the second sensor 58, and the third sensor 60 may also detect physical quantities such as acceleration, vibration, strain, or internal stress of the tool holder 14 in the XYZ directions. The first sensor 56, the second sensor 58, and the third sensor 60 may also detect acceleration of the tool holder 14 corresponding to the cutting load (main force component, back force component, feed force component) in three directions.

[0057] The positions of the first sensor 56, the second sensor 58, and the third sensor 60 in the X direction may be the same. The first sensor 56, the second sensor 58, and the third sensor 60 may also be sensors of electrostatic capacitance detection or sensors of piezo-resistance. When the first sensor 56, the second sensor 58, and the third sensor 60 are sensors of electrostatic capacitance detection, the sensors may also be MEMS (Micro Electro Mechanical Systems).

[0058] The detection direction of the first sensor 56 may be changed from the Y direction to the XY direction. The first sensor 56 may detect physical quantities such as acceleration, vibration, strain, or internal stress of the tool holder 14 in the XY direction. The first sensor 56 may detect acceleration of the tool holder 14 corresponding to the feed force component and the main force component. In these cases, either the second sensor 58 or the third sensor 60 may be omitted from the components of the sensor unit 46.

[0059] The detection direction of the second sensor 58 may be changed from the X direction to the XZ direction. The second sensor 58 may detect physical quantities such as acceleration, vibration, strain, or internal stress of the tool holder 14 in the XZ direction. The second sensor 58 may detect acceleration of the tool holder 14 corresponding to the back force and the main force. In this case, the third sensor 60 may be omitted from the components of the sensor unit 46.

[0060] The detection direction of the third sensor 60 may be changed from the Z direction to the XZ direction. The third sensor 60 may detect physical quantities such as acceleration, vibration, strain, or internal stress of the tool holder 14 in the XZ direction. The third sensor 60 may detect acceleration of the tool holder 14 corresponding to the main force component and the back force component. In this case, the second sensor 58 may be omitted from the components of the sensor unit 46.

[0061] like Figure 2 , Figure 5 , Figure 6 , Figure 8 as well as Fig. 9 As shown in the example, the cutting tool 10 may include a wiring member 62 electrically connected to the first sensor 56, the second sensor 58, and the third sensor 60. The wiring member 62 may extend from the first sensor 56 side toward the rear end 14b of the shank 14 in the X direction.

[0062] The tool handle 14 may also have a groove 64 extending from the first sensor 56 side toward the rear end 14b of the tool handle 14 in the X direction. The groove 64 of the tool handle 14 may also open on the second side surface 32. The groove 64 of the tool handle 14 may also open on the lower surface 28. The groove 64 of the tool handle 14 may also open on the lower surface 28 and the second side surface 32.

[0063] like Figure 6 , Figure 8 ,as well as Fig. 9 As shown in the example, the wiring member 62 may be located in the groove 64 of the shank 14. In other words, the groove 64 of the shank 14 may accommodate the wiring member 62. The wiring member 62 may have a wiring conductor 66 electrically connected to the first sensor 56, the second sensor 58, and the third sensor 60. The wiring conductor 66 may extend from the first sensor 56 side toward the rear end 14b of the shank 14 along the X direction. The wiring member 62 may have a cylindrical retaining member 68 that retains the wiring conductor 66. The retaining member 68 may be located in the groove 64 of the shank 14. In other words, the groove 64 of the shank 14 may accommodate the retaining member 68. The material of the retaining member 68 may be the same as that of the shank 14.

[0064] The wiring member 62 may be electrically connected to an information processing device provided outside the machine tool, etc. The information processing device may be constituted by a computer, and may include a memory storing various control programs and a CPU (Central Processing Unit) that interprets and executes the control programs.

[0065] By executing the control program using the CPU, the information processing device performs various functions. In one embodiment, the information processing device can also adjust the moving speed of the cutting tool 10 based on the physical quantity of the tool holder 14 detected by the first sensor 56, the second sensor 58, and the third sensor 60. In one embodiment, the information processing device can also adjust the rotation speed of the workpiece W based on the physical quantity of the tool holder 14 detected by the first sensor 56, the second sensor 58, and the third sensor 60.

[0066] According to the example of the embodiment of the present disclosure, physical quantities such as acceleration, vibration, strain, or internal stress of the tool holder 14 in the XYZ direction can be detected by at least two of the first sensor 56, the second sensor 58, and the third sensor 60. Acceleration of the tool holder 14 corresponding to the cutting load (main force component, back force component, feed force component) in three directions can be detected by at least two of the first sensor 56, the second sensor 58, and the third sensor 60. Therefore, according to the example of the embodiment of the present disclosure, high detection accuracy of the sensor unit 46 can be ensured.

[0067] When the first sensor 56, the second sensor 58, and the third sensor 60 detect physical quantities such as acceleration of the tool holder 14 in the XYZ directions, it is possible to improve the detection accuracy of the sensor unit 46. In particular, when the position of the third sensor 60 in the X direction is the same as the position of the second sensor 58 in the X direction, the detection accuracy of the sensor unit 46 can be further improved.

[0068] When the distance in the X direction from the unit base 48 to the front end face 22 of the tool holder 14 is shorter than the distance in the X direction from the unit base 48 to the rear end face 24 of the tool holder 14, the sensor unit 46 is located near the front end face 22 of the tool holder 14 where the change in physical quantities such as acceleration is large. Therefore, according to the example of the embodiment of the present disclosure, since it is close to the cutting processing point, it is possible to capture a small change in physical quantity, and the detection accuracy of the sensor unit 46 can be improved.

[0069] According to the example of the embodiment of the present disclosure, the unit base 48 is arranged in the orthogonal region of the outer surface of the handle 14, that is, from the lower surface 28 of the main body 14m of the handle 14 to the second side surface 32. The unit base 48 is L-shaped in the cross section orthogonal to the X direction which is the length direction of the handle 14. Therefore, the unit base 48 can be attached to the outer surface of the handle 14 without performing processing such as gouging on the handle 14. Therefore, according to the example of the embodiment of the present disclosure, the durability (rigidity) of the handle 14 can be improved.

[0070] In addition, according to the example of the embodiment of the present disclosure, the unit base 48 is L-shaped in the cross section perpendicular to the X direction, so the protrusion amount of the sensor unit 46 relative to the outer surface of the tool holder 14 can be reduced compared to the case where the cubic unit base is mounted on the outer surface of the tool holder 14. Therefore, according to the example of the embodiment of the present disclosure, the sensor unit 46 is less likely to be affected by chips, the durability of the sensor unit 46 is improved, and the mounting of the cutting tool 10 to the tool holder 12 becomes simple.

[0071] In addition, according to the example of the embodiment of the present disclosure, the unit base 48 is mounted on the handle 14 from two directions, the lower surface 28 and the second side surface 32 of the handle 14, so the unit base 48 is difficult to fall off from the handle 14. In addition, not only is it difficult for the unit base 48 to fall off from the handle 14, but the positional deviation of the unit base 48 relative to the handle 14 is also difficult to occur.

[0072] When the entire first portion 48a of the unit base 48 is located closer to the second side surface 32 than the first side surface 30 of the tool holder 14, the sensor unit 46 does not protrude from the first side surface 30 of the tool holder 14 in the Y direction. Therefore, according to the example of the embodiment of the present disclosure, the sensor unit 46 is less likely to be affected by the chips, and the durability of the sensor unit 46 can be improved.

[0073] In addition, when the entire second portion 48b of the unit base 48 is located closer to the lower surface 28 than the upper surface 26 of the tool holder 14, the sensor unit 46 does not protrude from the upper surface 26 of the tool holder 14 in the Z direction. Therefore, according to the example of the embodiment of the present disclosure, the sensor unit 46 is less likely to be affected by the chips, and the durability of the sensor unit 46 can be improved.

[0074] According to the example of the embodiment of the present disclosure, the detection direction of the first sensor 56, the second sensor 58, and the third sensor 60 is one direction or two directions in the XYZ direction. In other words, the first sensor 56, the second sensor 58, and the third sensor 60 are uniaxial sensors or biaxial sensors. Therefore, compared with the case of using a triaxial sensor whose detection direction is the three directions of the XYZ direction, the size of the sensor equivalent to one can be reduced, and the sensor unit 46 can be made compact.

[0075] As described above, the unit base 48 is disposed from the lower surface 28 of the main body portion 14 m of the handle 14 to the second side surface 32 , but may be configured as follows.

[0076] like Fig.10 as well as Fig.11 As in the example shown, the unit base 48 may also be arranged from the lower surface 28 to the front end surface 22 of the shank 14 .

[0077] In this case, the unit base 48 may also include a first portion 48a located on the lower surface 28 of the tool handle 14 and a second portion 48b located on the front end surface 22 of the tool handle 14. The first portion 48a of the unit base 48 may also include a first recessed portion opened toward the lower surface 28 of the tool handle 14. The second portion 48b of the unit base 48 may also include a second recessed portion opened toward the front end surface 22 of the tool handle 14. The second portion of the unit base 48 may also include a third recessed portion opened toward the front end surface 22 of the tool handle 14. The first sensor located in the first recessed portion of the unit base 48 may also abut against the lower surface 28 of the tool handle 14. The second sensor located in the second recessed portion of the unit base 48 may also abut against the front end surface 22 of the tool handle 14. The third sensor located in the third recessed portion of the unit base 48 may also abut against the front end surface 22 of the tool handle 14.

[0078] In addition, if Fig.12 as well as Fig.13 As in the illustrated example, the unit base 48 may also be arranged from the front end surface 22 to the second side surface 32 of the tool handle 14 .

[0079] In this case, the unit base 48 may also include a first portion 48a located at the front end surface 22 of the tool handle 14 and a second portion 48b located at the second side surface 32 of the tool handle 14. The first portion 48a of the unit base 48 may also include a first recessed portion opened toward the front end surface 22 of the tool handle 14. The second portion 48b of the unit base 48 may also include a second recessed portion opened toward the second side surface 32 of the tool handle 14. The second portion of the unit base 48 may also include a third recessed portion opened toward the second side surface 32 of the tool handle 14. The first sensor located in the first recessed portion of the unit base 48 may also abut against the front end surface 22 of the tool handle 14. The second sensor located in the second recessed portion of the unit base 48 may also abut against the second side surface 32 of the tool handle 14. The third sensor located in the third recessed portion of the unit base 48 may also abut against the second side surface 32 of the tool handle 14.

[0080] In both cases, the sensor unit 46 is arranged close to the cutting edge 42 of the cutting insert 16, and can detect the physical quantity of the holder 14 (cutting tool 10) with high accuracy. Figures 1 to 9 The example cutting tool 10 shown has Figures 10 to 13 Compared with the cutting tool 10 of the illustrated example, the sensor unit 46 can be arranged away from the machined surface of the workpiece W. Therefore, the possibility that the sensor unit 46 contacts the machined surface of the workpiece W is low.

[0081] <Method for manufacturing machined product>

[0082] Reference Figures 14 to 16 A method for producing a machined product according to an embodiment of the present disclosure will be described. Figures 14 to 16 It is a schematic diagram for explaining the method for producing a machined product according to an embodiment of the present disclosure.

[0083] like Figures 14 to 16 As shown in the example, the method for manufacturing a cut workpiece of the embodiment of the present disclosure is a method for manufacturing a cut workpiece M which is a cut workpiece W that has been cut, and includes a first step, a second step, and a third step. The first step refers to a step of rotating the cut workpiece W around its axis S. The second step refers to a step of cutting the cut workpiece W by bringing the cutting blade 16 of the cutting tool 10 into contact with the rotating cut workpiece W. The third step refers to a step of separating the cutting tool 10 from the cut workpiece W after cutting. Examples of the material of the cut workpiece W include stainless steel, carbon steel, alloy steel, cast iron, or nonferrous metals. The specific contents of the method for manufacturing a cut workpiece of the embodiment are as follows.

[0084] First, the cutting tool 10 is mounted on the tool holder 12, and the workpiece W is mounted on the chuck of the lathe. Fig.14As shown in the example, the chuck is rotated to rotate the workpiece W around its axis S (first step). Fig.15 As shown in the example, the cutting tool 10 is moved in the direction of arrow D1 to approach the workpiece W, and the cutting tip 16 is brought into contact with the rotating workpiece W to cut the workpiece W (second step). Thus, a machined surface Wf can be formed on the workpiece W.

[0085] Afterwards, if Fig.16 As shown in the example, by moving the cutting tool 10 in the direction of the arrow D2, the cutting tool 10 is separated from the workpiece W (third step). As a result, the cutting process of the workpiece W is completed, and a machined product M can be manufactured as the workpiece W after the cutting process is completed. The cutting tool 10 has excellent cutting ability for the reasons described above, and thus can manufacture a machined product M with excellent machining accuracy.

[0086] When the cutting process is continued, the cutting blade 16 may be repeatedly brought into contact with different locations of the workpiece W while the workpiece W is rotated. In the embodiment of the present disclosure, the cutting tool 10 is brought close to the workpiece W, but the cutting tool 10 and the workpiece W may be brought relatively close to each other, so the workpiece W may be brought close to the cutting tool 10. In this regard, the same method is used when the cutting tool 10 is separated from the workpiece W.

[0087] In one embodiment, (1) a cutting tool comprises a shank, a cutting insert and a sensor unit, wherein the shank is in the shape of a rod extending from a front end toward a rear end and has: a front end face located on the side of the front end; an upper surface extending from the front end face toward the rear end; a lower surface located on the opposite side of the upper surface; a first side surface located between the upper surface and the lower surface and extending from the front end face toward the rear end; a second side surface located on the opposite side of the first side surface; and a tool groove opening on the front end face, the upper surface and the first side surface, wherein the cutting insert is located The tool groove has a cutting edge, and the sensor unit has: a unit base, which is configured from the lower surface to the second side surface, and has a first recessed portion opening toward the lower surface and a second recessed portion opening toward the second side surface, and is L-shaped in a cross section perpendicular to the length direction of the tool handle; a first sensor, which is located in the first recessed portion, abuts against the lower surface, and detects the physical quantity of the tool handle; and a second sensor, which is located in the second recessed portion, abuts against the second side surface, and detects the physical quantity of the tool handle in a detection direction perpendicular to the detection direction of the first sensor.

[0088] (2) Based on the cutting tool of (1), the unit base may also have a third recessed portion opening toward the second side surface, and the sensor unit may also have a third sensor, which is located in the third recessed portion and abuts against the second side surface and detects the physical quantity of the tool holder in a detection direction orthogonal to the detection directions of the first sensor and the second sensor.

[0089] (3) In the cutting tool according to (2), a position of the third sensor in the longitudinal direction may be the same as a position of the second sensor in the longitudinal direction.

[0090] (4) Based on any one of the cutting tools described in (1) to (3), the shank may further include a rear end face located on the opposite side of the front end face, and a distance in the length direction from the unit base to the front end face is shorter than a distance in the length direction from the unit base to the rear end face.

[0091] (5) In the cutting tool described in any one of (1) to (4), the unit base may include a first portion located on the lower surface and a second portion located on the second side surface, and the first portion as a whole is located closer to the second side surface than the first side surface.

[0092] (6) In the cutting tool according to any one of (1) to (5), the unit base may include a first portion located on the lower surface and a second portion located on the second side surface, wherein the entire second portion is located closer to the lower surface than the upper surface.

[0093] (7) A method for manufacturing a machined product comprising: a step of rotating a workpiece; a step of bringing any one of the cutting tools described in (1) to (6) into contact with the rotating workpiece and cutting the workpiece; and a step of separating the cutting tool from the workpiece after being cut.

[0094] The invention of the present disclosure has been described above based on the drawings and embodiments. However, the invention of the present disclosure is not limited to the aforementioned embodiments. That is, the invention of the present disclosure can be variously modified within the scope shown in the present disclosure, and the embodiments obtained by appropriately combining the disclosed technical means for different embodiments are also included in the technical scope of the invention of the present disclosure. That is, it is to be noted that it is easy for a person skilled in the art to make various deformations or corrections based on the present disclosure. In addition, it is to be noted that these deformations or corrections are included in the scope of the present disclosure.

[0095] Description of Reference Numerals

[0096] 10 Cutting tools

[0097] 12 Tool holder

[0098] 12a Loading surface

[0099] 12b inner wall surface

[0100] 12c Fixing screw

[0101] 14 Handle

[0102] 14a Front End

[0103] 14b Backend

[0104] 14m Main body

[0105] 16 Cutting inserts

[0106] 18 Clamping piece

[0107] 20 Clamping screw

[0108] 22 Front face

[0109] 24 rear end

[0110] 26 Upper surface

[0111] 28 Lower surface

[0112] 30 First side

[0113] 32 Second side

[0114] 34 Slots

[0115] 36 First blade surface

[0116] 38 Second blade surface

[0117] 40 Blade side

[0118] 42 Cutting Edge

[0119] 44 Through hole

[0120] 46 Sensor Unit

[0121] 48-unit base

[0122] 48a First part

[0123] 48b Second part

[0124] 50 First recess

[0125] 52 Second recess

[0126] 54 Third recess

[0127] 56 First Sensor

[0128] 58 Second sensor

[0129] 60 Third sensor

[0130] 62 Wiring components

[0131] 64 slots

[0132] 66 Wiring conductors.

Claims

1. A cutting tool, wherein: The cutting tool comprises a tool holder, a cutting insert and a sensor unit. The handle is in the shape of a rod extending from the front end toward the rear end and has: a front end surface, which is located on the side of the front end; an upper surface extending from the front end face toward the rear end face; a lower surface located on an opposite side of the upper surface; A first side surface, which is located between the upper surface and the lower surface and extends from the front end surface toward the rear end; a second side surface, which is located on the opposite side of the first side surface; as well as a knife groove, which opens on the front end surface, the upper surface and the first side surface, The cutting blade is located in the blade groove and has a cutting edge. The sensor unit has: a unit base, which is arranged from the lower surface to the second side surface, has a first recessed portion opened toward the lower surface and a second recessed portion opened toward the second side surface, and is L-shaped in a cross section perpendicular to the longitudinal direction of the handle; a first sensor located in the first recess and in contact with the lower surface to detect a physical quantity of the tool handle; as well as The second sensor is located in the second recess and abuts against the second side surface, and detects a physical quantity of the tool handle in a detection direction orthogonal to a detection direction of the first sensor.

2. The cutting tool according to claim 1, wherein: The unit base has a third recessed portion opening toward the second side surface, The sensor unit further includes a third sensor that is located in the third recess and abuts against the second side surface and detects a physical quantity of the tool holder in a detection direction that is orthogonal to the detection directions of the first sensor and the second sensor.

3. The cutting tool according to claim 2, wherein: The position of the third sensor in the length direction is the same as the position of the second sensor in the length direction.

4. The cutting tool according to any one of claims 1 to 3, wherein: The handle further comprises a rear end face located on the opposite side of the front end face, A distance from the unit base to the front end surface in the longitudinal direction is shorter than a distance from the unit base to the rear end surface in the longitudinal direction.

5. The cutting tool according to any one of claims 1 to 4, wherein: The unit base has a first portion located on the lower surface and a second portion located on the second side surface, The entire first portion is located closer to the second side surface than the first side surface.

6. The cutting tool according to any one of claims 1 to 5, wherein: The unit base has a first portion located on the lower surface and a second portion located on the second side surface, and the entire second portion is located closer to the lower surface than the upper surface.

7. A method for manufacturing a machined product, wherein: The method for manufacturing the machined product comprises: The process of rotating the workpiece; a step of bringing the cutting tool according to any one of claims 1 to 6 into contact with the rotating workpiece to cut the workpiece; and A step of separating the cutting tool from the workpiece after cutting.

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