JP4972625B2 - Cutting tool for shaft end - Google Patents

Description

  The present invention relates to an end cutting tool for a shaft-shaped member that can be suitably used for end processing of a torcia bolt.

  Steel frames in steel structures such as bridges and high-rise buildings are joined by inserting bolts into bolt holes formed in the steel frames and fastening nuts to the bolt ends. As a bolt for connecting steel frames, a breaking groove was formed in the vicinity of the tip of the bolt, and the nut could be tightened while holding the pin tail on the tip side of the breaking groove, and the tightening torque exceeded the set torque The so-called Torcia bolt, which is configured so that the pin tail falls off when the fracture groove breaks, can receive the tightening reaction force with the pin tail, prevent the bolt from rotating together, and ensure the desired tightening torque. (See, for example, Patent Document 1).

  By the way, in the torcia-type bolt, the pin tail is broken along the breaking groove, so that a broken surface is formed at the tip of the bolt after the pin tail is broken, and if the finger comes into contact with the broken surface, injury may occur. There is a problem that the bolt is corroded from the fractured surface because the fractured surface has a surface that is not subjected to rust prevention treatment or the like. In addition, in order to prevent corrosion, it is also practiced to apply a rust preventive paint, etc. to the bolt end after breaking the pin tail. There is a problem that the rust coating is poor and the coating film is easily peeled off, and the rust prevention effect cannot be sufficiently secured over a long period of time.

  Therefore, a bolt end processing device (for example, see Patent Document 2) that polishes or cuts the front end of the bolt into a smooth surface has been proposed and put into practical use.

JP-A-8-105422 JP 2008-155372 A

  However, when a bolt end processing test was performed using a processing apparatus for processing the bolt end by polishing, a processing time of about 30 to 60 seconds per bolt was required, and a relatively small bridge was used. Even in such a case, since thousands of bolts are used, there has been a problem that a long processing time is required for the grinding operation.

  In addition, when a processing test of the bolt end was performed using a processing device that processed the bolt end by cutting, the processing time could be greatly shortened, but when an end mill with a general configuration was used as a cutting tool There was a problem that the durability of the cutting tool could not be secured sufficiently. In addition, a cutting test was performed on an end mill in which a cutting edge tip was detachably fixed to the tip of the tool body as a cutting tool. However, a tip made of a cemented carbide widely used for metal cutting as a cutting edge tip. When cutting, the impact force acts on the cutting edge tip during cutting, and the cutting edge tip may be damaged. In addition, when the cutting edge tip is fixed at a general mounting position, a small but small projection is formed at the center of the bolt end surface, which reduces the appearance of the bolt end surface and prevents rust. Another problem occurred in that the coating was poor and the coating film was easily peeled off.

  An object of the present invention is to provide an end cutting tool for a shaft-shaped member capable of significantly reducing the end processing time of the shaft-shaped member and capable of cutting the end surface of the shaft-shaped member into a clean flat surface without unevenness. That is.

  An end cutting tool for a shaft-shaped member according to the present invention includes an inner blade tip that cuts the central portion of the end surface of the shaft-shaped member substantially flatly, an outer blade tip that chamfers the outer peripheral portion of the end surface of the shaft-shaped member, A tool body provided with a mounting portion for detachably fixing both tips at the tip in the axial direction, and the rotational outer peripheral side of the cutting blade of the inner blade tip is directed toward the base side of the tool body from the rotation center side The inner blade tip is fixed to the attachment portion of the tool body so as to be inclined, and the rotation center side of the cutting edge of the outer blade tip is inclined toward the base side of the tool body from the rotation outer peripheral side, The outer blade tip is fixed to the mounting portion of the tool body.

  When cutting the end face of the shaft-shaped member with this end cutting tool, the rotation center of the tool body is arranged concentrically with the shaft-shaped member, and the inner blade tip and the outer blade tip are rotated together with the tool body, The center part of the end face of the shaft-like member is cut substantially flat with the inner blade tip, and the outer peripheral part of the end face of the shaft-like member is chamfered by cutting with the outer blade tip. And since the end surface of a shaft-shaped member is processed by cutting in this way, compared with the case where the end surface of a shaft-shaped member is processed by grinding | polishing, processing time can be shortened significantly.

  In addition, since the inner blade tip is fixed to the mounting portion of the tool body so that the rotation outer peripheral side of the cutting blade of the inner blade tip is inclined toward the base side of the tool body from the rotation center side, A mortar-shaped concave portion corresponding to the inclination angle of the cutting edge of the inner blade tip is formed at the center portion of the end surface, thereby preventing a protrusion from being formed at the center portion of the end surface of the shaft-shaped member. For this reason, it is possible to effectively prevent deterioration of the appearance of the shaft-shaped member due to the formation of the projection at the center of the end surface of the shaft-shaped member and poor coating such as a rust preventive paint on the end surface of the shaft-shaped member. In addition, since a mortar-shaped concave portion is formed at the central portion of the end surface of the shaft-shaped member, a coating film such as a rust preventive paint at the central portion of the end surface of the shaft-shaped member is thickened, and poor coating can be prevented more effectively. However, the inclination angle of the cutting edge of the inner blade tip can be set to any angle as long as it is an angle larger than 0 °, but if it is too large, a large concave portion is formed on the end face of the shaft member, so that it is 5 ° or less. It is preferable to set, for example, it is preferable to set to 0.5 ° to 1.5 °.

  Here, it is a preferred embodiment that both the tips are made of high speed steel. Thus, if both tips are made of high-speed steel, cutting tips that are more resistant to impact than cemented carbide will be obtained, so that the present invention can be suitably used as a cutting tool for a portable end processing device.

  It is also preferable that at least the cutting blades of the inner blade tips are arranged in the radial direction of the tool body, or the cutting blades of both the chips are arranged radially on both sides of the rotation center of the tool body. It is a form. In this case, it is possible to more effectively prevent the protrusion from being formed at the center of the end face of the shaft-like member.

  According to the end cutting tool for the shaft-shaped member according to the present invention, the end surface of the shaft-shaped member is cut by the outer blade tip and the inner blade tip, so as compared with the case of processing the end surface of the shaft-shaped member by polishing, Processing time can be greatly reduced. In addition, since the inner blade tip is fixed to the mounting portion of the tool body so that the rotation outer peripheral side of the cutting blade of the inner blade tip is inclined toward the base side of the tool body from the rotation center side, A mortar-shaped concave portion corresponding to the inclination angle of the cutting edge of the inner blade tip is formed at the center portion of the end surface, thereby preventing a protrusion from being formed at the center portion of the end surface of the shaft-shaped member. For this reason, it is possible to effectively prevent deterioration of the appearance of the shaft-shaped member due to the formation of the projection at the center of the end surface of the shaft-shaped member and poor coating such as a rust preventive paint on the end surface of the shaft-shaped member. In addition, since a mortar-shaped concave portion is formed at the central portion of the end surface of the shaft-shaped member, a coating film such as a rust preventive paint at the central portion of the end surface of the shaft-shaped member is thickened, and poor coating can be prevented more effectively.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the shaft member end cutting tool according to the present invention is applied to a bolt end processing apparatus for cutting the end of a torcia bolt.

  As shown in FIG. 1, a bolt end processing apparatus 10 includes a portable processing apparatus main body 11 that processes the end of a bolt 1 constructed on a steel structure such as a bridge or a high-rise building into a smooth surface, and a processing And a portable suction device 45 for sucking chips generated in the apparatus main body 11. And this bolt end part processing apparatus 10 processes the front-end | tip part of the some volt | bolt 1 fastened, for example to the flange part 5a of the H-shaped steel 5, and the gusset plate 6 in order to a smooth surface.

  Here, the bolt 1 to be cut by the bolt end processing apparatus 10 is a torcia-type bolt, and as shown in FIG. 11A, a breaking groove 3 is formed in the vicinity of the tip of the bolt 1, and the breaking groove is formed. A pin tail 4 is formed on the tip side of the pin 3. For example, when the flange portion 5a of the H-shaped steel 5 and the gusset plate 6 are coupled with the bolt 1, the mounting holes formed in the flange portion 5a and the gusset plate 6 as shown in FIG. 11 (b) with the bolt 1 attached to the nut 7, the nut 2 screwed onto the tip of the bolt 1, and the nut 2 and the pin tail 4 held in the socket of a shear wrench (not shown). As shown, the bolt 1 is fastened to the nut 2 until the bolt 1 breaks along the breaking groove 3, and the flange portion 5a and the gusset plate are coupled. For this reason, in this bolt 1, although the bolt 1 can be reliably fastened with torque more than a required torque, the front-end | tip part 1a of the bolt 1 after construction will be comprised by the fracture surface which is easy to rust. The present invention is suitable for processing the tip 1a of such a bolt 1 into a smooth surface on which a rust preventive paint is easy to ride. However, even in a bolt having a general configuration, the tip end portion can be cut into a smooth surface by using the bolt end portion processing apparatus 10 after the construction, and the tip end of a shaft-like member other than the bolt 1 is used. The part can also be cut into a smooth surface by the bolt end processing apparatus 10.

  As shown in FIGS. 1 to 6, the processing apparatus main body 11 is a portable type that can be operated while being supported by an operator with both hands. An outer sleeve 12 that can be fitted, a cutting tool 13 that cuts the front end of the bolt 1 and that has a certain gap between the outer sleeve 12 and a cutting tool 13 that rotates the cutting tool 13. ing.

  The driving means 14 includes an electric motor (not shown) and a speed reducer incorporated in the casing 15, and a tool is detachably held on a chuck 17 provided on the output shaft 16 of the speed reducer, so that a push button type power switch is provided. 18, the chuck 17 is configured to be able to rotate at a reduced speed, and is configured by a main body device such as a general-purpose electric drill. However, it is preferable to use a main body device such as a general-purpose electric drill as the driving means 14 in order to reduce the manufacturing cost. However, the driving means 14 may have any configuration as long as the chuck 17 can be rotationally driven by the electric motor. Can be adopted.

  The outer sleeve 12 includes a fixed sleeve 20 that is externally fitted and fixed to the distal end portion of the chuck 17, a connecting sleeve 22 that is rotatably mounted on the fixed sleeve 20 via a bearing 21 and is not movable in the axial direction, and a base end portion. An extension sleeve 23 fitted and fixed to the distal end portion of the connecting sleeve 22 by welding, a socket holding member 24 fitted and fixed to the distal end portion of the extension sleeve 23, and a socket 25 detachably attached to the socket holding member 24. I have.

  The fixed sleeve 20 is fixed to the chuck 17 by using two fixing screws 26, and a bearing 21 is externally fixed to the fixed sleeve 20 so as not to move in the axial direction. The socket 25 is configured as a shear wrench socket, and on the inner peripheral surface of the socket 25, twelve engagement grooves 25 a that fit into the nut 2 are formed in the axial direction. A ring-shaped flange 27 is formed on the outer periphery of the socket 25 so as to protrude outward, and four engagement notches 28 are formed in the flange 27 at intervals in the circumferential direction. An engagement protrusion 29 that engages with the engagement notch 28 is formed in a protruding shape at the tip of the socket holding member 24, and the socket 25 has the engagement notch 28 engaged with the engagement protrusion 29. The two fixing screws 30 are fastened to be attached to the socket holding member 24 so as not to rotate relative to each other. The connecting sleeve 22, the extension sleeve 23, the socket holding member 24, and the socket 25 can be formed as an integral member, but at least the socket 25 can be replaced according to the size of the nut 2 to be fitted. Since it comprises, it is preferable to comprise by another member. Further, in the present embodiment, the outer sleeve 12 is rotatably attached to the chuck 17, but the fixed sleeve 20 and the bearing 21 are omitted, and the base end portion of the connecting sleeve 22 is attached to the casing 15 of the driving means 14. It is also possible to fix. In this case, the cutting reaction force by the cutting tool 13 can be received by the nut 2 via the casing 15 and the outer sleeve 12. However, the present invention has a feature in the configuration of the cutting tool 13, and the configuration of the processing apparatus main body 11 can employ a configuration other than those described above.

  The cutting tool 13 will be described. As shown in FIGS. 3 to 9, a substantially cylindrical tool main body 31 is provided, and a shaft portion 32 that is detachably fixed to the chuck 17 at the base end portion of the tool main body 31. Are integrally formed. A bearing 33 is provided between the middle portion of the tool main body 31 and the outer sleeve 12, and the tool main body 31 is rotatably provided on the outer sleeve 12 via the bearing 33.

  An inner blade mounting portion 34 and an outer blade mounting portion 35 are formed so as to protrude in the axial direction at the distal end portion of the tool body 31, and the inner blade mounting surface 34 a on the front side in the rotation direction of the tool body 31 in the inner blade mounting portion 34. The inner blade tip 36 having a substantially positive plate shape is fixed with the cutting blade 36a in the radial direction of the tool main body 31, and the outer blade mounting surface 35a of the outer blade mounting portion 35 on the front side in the rotation direction of the tool main body 31 is approximately A forward-direction plate-shaped outer blade tip 37 is fixed with the cutting blade 37 a in the radial direction of the tool body 31, and chips are discharged to the front side in the rotational direction of the inner blade tip 36 and to the front side in the rotational direction of the outer blade tip 37. The discharge groove 31a is formed.

  The inner blade tip 36 is fixed to the inner blade attachment portion 34 and the outer blade tip 37 is fixed to the outer blade attachment portion 35 by inserting a fixing screw 38 into the center portion of the tips 36 and 37, respectively. 34 and 35 are screwed together and fixed by clamping the chips 36 and 37 between the clamper 40 and the mounting surfaces 34a and 35a by clampers 40 fixed to the mounting portions 34 and 35 by mounting screws 39, respectively. Has been. However, the clamper 40 can be omitted when the fixing screws 38 can sufficiently secure the attachment strength of the tips 36 and 37 to the attachment portions 34 and 35.

  The tips 36 and 37 are preferably made of high-speed steel because of their excellent impact resistance, and the cutting edges 36a and 37a are formed on the four sides of the substantially square plate-like tips 36 and 37. What constituted so that cutting blades 36a and 37a can be changed in order can be adopted suitably. However, as the chips 36 and 37, those made of a material other than high speed steel and those made of a shape other than a square plate shape can be adopted. As both chips 36 and 37, those having the same configuration can be adopted, or those having different configurations can be adopted. However, in order to reduce the number of parts, those having the same configuration are preferably adopted.

  As shown in FIG. 8, both the tips 36 and 37 are arranged such that the cutting edges 36 a and 37 a used for cutting are arranged in the orthogonal direction D of the tool body 31 on both sides of the rotation center P of the tool body 31. Is provided. However, as long as at least the cutting edge 36a of the inner cutting edge tip 36 is arranged in the radial direction of the tool body 31, the cutting edge 37a of the outer cutting edge tip 37 can be arranged in another direction.

  As shown in FIG. 9 (a), the inner peripheral edge tip 36 of the inner cutting edge 36a is inclined toward the base side of the tool body 31 from the rotational center P side with respect to the rotational outer peripheral side of the cutting edge 36a. It is fixed to the inner blade mounting part 34 of the tool body 31 so as to protrude somewhat to the opposite side across the rotation center P. The inclination angle α of the cutting edge 36a of the inner blade tip 36 with respect to the line L orthogonal to the rotation center P of the tool body 31 can be set to any angle as long as it is an angle larger than 0 °. Since a large concave portion is formed on the end face, it is preferably set to 5 ° or less, for example, preferably set to 0.5 ° to 1.5 °.

  Further, the outer blade tip 37 is fixed to the outer blade mounting portion 35 of the tool body 31 so that the rotation center P side of the cutting blade 37a is inclined toward the base side of the tool body 31 from the rotation outer peripheral side. . The inclination angle β of the cutting edge 37a of the outer blade tip 37 with respect to the line L perpendicular to the rotation center P of the tool body 31 is set to be larger than 0 ° and not larger than 45 °. Therefore, it is preferable to set the angle to 5 ° or more and 20 ° or less. Both tips 36 and 37 have their end faces 36b and 37b opposite to the cutting edges 36a and 37a abutting against the attachment faces 34a and 35a, respectively, and the lower edges of the end faces 36b and 37b are the corners of the attachment portions 34 and 35. The parts 34b and 35b are brought into contact with each other, and are positioned in an appropriate posture with respect to the attachment parts 34 and 35.

  As shown in FIG. 9B, the rotation trajectory of the cutting edge 36a of the inner blade tip 36 and the rotation trajectory of the cutting blade 37a of the outer blade tip 37 are intersection points A slightly inside the outer peripheral edge of the end of the bolt 1. The tip 1a of the bolt 1 is cut into an annular gentle mountain shape with the position corresponding to the intersection A as the top, and a moderately mortar-like shape is formed at the center of the bolt 1 by the inner blade tip 36. A flat surface 1 </ b> A is formed, and a gentle conical chamfered surface 1 </ b> B is formed on the outer peripheral side of the bolt 1 by the outer blade tip 37.

  10, a tool main body 31A in which a spline 41 extending in the axial direction is formed at the base instead of the tool main body 31 is used, and the base of the tool main body 31A is replaced with the chuck 17 instead of the tool main body 31. It is also possible to employ a cutting tool configured so that the cutting tool 13A can be fixed to the chuck by using a driving means provided with a holdable chuck and fitting the base portion of the tool main body 31A to the chuck.

  In addition, with the cutting tool 13 in contact with the tip 1 a of the bolt 1 so that the cutting tool 13 can cut the tip 1 a of the bolt 1, between the tip of the socket 25 and the washer 8 of the nut 2, The cutting tool 13 is disposed in the outer sleeve 12 so that at least a gap T (see FIG. 6) corresponding to the feed amount necessary for cutting is formed.

  As shown in FIG. 1, the suction machine 45 sucks chips in the outer sleeve 12 and can adopt a canister type vacuum cleaner that can be moved by a caster. Since the floor surface is not flat or the building material is installed on the floor surface, it is preferable that the cleaner is configured to be used on the shoulder or on the back. As the dust collection method, a cyclone type can be adopted, but it is preferable to adopt a filter type vacuum cleaner having a high suction force so that metal chips can be sucked efficiently.

  2 to 4, the hose 46 of the suction machine 45 is connected to an intermediate portion of the outer sleeve 12, and the suction machine 45 is operated to suck chips in the outer sleeve 12 together with air. It is configured as follows. The connection position of the hose 46 with respect to the outer sleeve 12 is preferably set near the tip of the cutting tool 13 so that chips can be sucked efficiently. be able to. In the present embodiment, in order to allow a general-purpose product to be used as the socket 25 fitted on the nut 2, the extension sleeve 23 is connected to the vicinity of the tip. Further, by sucking the chips in the outer sleeve 12 together with air by the suction machine 45, the outside air is introduced into the outer sleeve 12 from the gap between the nut 2 and the socket 25, so that the cutting tool 13 due to heat generated during cutting. This is preferable because it can prevent the thermal degradation of the cutting tool 13 by suppressing the temperature rise. However, the suction device 45 is not necessarily provided, and every time the tip of the bolt 1 is cut, the chips in the outer sleeve 12 can be discharged into a trash box or the like with the socket 25 side facing down. . In addition, an opening for discharging chips can be formed in the lower part of the socket 25, and a storage case for temporarily storing chips discharged from the opening can be detachably provided below the socket 25.

  When cutting the tip of the bolt 1 with the bolt end processing apparatus 10, first, as shown in FIG. 1, while holding the suction apparatus 45 on the back and holding the processing apparatus main body 11 with both hands, the processing apparatus main body 11. The socket 25 at the tip of the outer sleeve 12 attached to the outer sleeve 12 is inserted into the nut 2 so as to fit externally, so that the axis of the cutting tool 13 matches the axis of the bolt 1. At this time, as shown in FIG. 6, the socket 25 cannot be inserted to the base end portion of the nut 2 because the tip end of the cutting tool 13 abuts on the tip end portion of the bolt 1. 80 to 90% of the cutting tool 13 can be inserted, so that the axis of the cutting tool 13 and the axis of the bolt 1 can be easily matched.

  Next, while rotating the cutting tool 13 by the driving means 14 of the processing apparatus main body 11, the end of the cutting tool 13 is brought into pressure contact with the end of the bolt 1 to cut the end of the bolt 1. Specifically, the center portion of the tip 1a of the bolt 1 is cut into a gentle mortar-shaped flat surface 1A by the cutting blade 36a of the inner blade tip 36, and the bolt 1 is cut by the cutting blade 37a of the outer blade tip 37. The outer peripheral portion of the tip portion 1a is cut into a gently conical chamfered surface 1B. Cutting by the cutting tool 13 is performed in the outer sleeve 12, and the tip opening of the outer sleeve 12 is closed by the nut 2. Therefore, chips generated during cutting remain in the outer sleeve 12 and scatter to the outside. Never do.

  On the other hand, when cutting the tip 1 a of the bolt 1, the suction machine 45 is operated to suck chips generated during the cutting and collect them in a dust collection bag or the like (not shown) of the suction machine 45. When the chips in the outer sleeve 12 are sucked, outside air is introduced into the outer sleeve 12 through the gap between the socket 25 and the nut 2. For this reason, it is possible to prevent chips from falling from the gap between the socket 25 and the nut 2 to the outside, and the cutting tool 13 is cooled by the outside air introduced into the outer sleeve 12, and the cutting tool 13 is heated. Deterioration is prevented. The suction machine 45 can be operated as necessary by manual operation, or can be operated in conjunction with the driving means 14. In addition, after processing the front-end | tip part 1a of the volt | bolt 1 in this way to a smooth surface sequentially, the operation | work which applies a rust-proof coating to a process surface is performed sequentially, and the corrosion of the volt | bolt 1 is prevented.

  In this bolt end processing apparatus 10, the tip of the bolt 1 can be cut with the socket 25 inserted into the nut 2 and the axis of the cutting tool 13 aligned with the axis of the bolt 1. The portion 1a can be cut smoothly, a clean work surface of uniform quality can be obtained, and the cutting tool 13 is pressed against the bolt 1 while being tilted with respect to the bolt 1. Damage can be prevented. Moreover, since the edge part of the volt | bolt 1 is cut in the exterior sleeve 12, scattering of the chip generated at the time of cutting can be prevented. Moreover, since the chips generated during cutting are sucked by the suction machine 45, the chips can be easily collected and the cutting tool 13 can be cooled by the outside air introduced into the outer sleeve 12, so that heat is generated during cutting. Thus, it is possible to prevent the cutting tool 13 from being thermally deteriorated. Furthermore, since the front end portion of the bolt 1 is processed by cutting, the processing time of the front end portion of the bolt 1 can be greatly reduced as compared with the case of processing by polishing or grinding. Furthermore, the inner blade tip 36 is attached to the inner blade mounting portion 34 of the tool body 31 so that the rotational outer peripheral side of the cutting blade 36 a of the inner blade tip 36 is inclined toward the base side of the tool body 31 from the rotation center P side. Since it is fixed, it is possible to prevent the projection from being formed at the center of the end face of the bolt 1 after cutting, and the occurrence of deterioration in the appearance and poor coating of the rust preventive paint due to the formation of the projection is obviated. Can be prevented.

  In the present embodiment, the present invention is applied to the end processing apparatus 10 for the bolt 1, but the present invention is applied to an end processing apparatus for cutting an end of a shaft-shaped member other than the bolt 1. Further, the end processing apparatus 10 can be configured to be portable, or can be used in a factory.

Explanatory drawing of bolt end processing equipment Side view of main body Disassembled perspective view of exterior sleeve and cutting tool Longitudinal sectional view of the main body of the processing equipment near the exterior sleeve Illustration of cutting tool Explanatory drawing of how to use bolt end processing equipment Perspective view of cutting tool Front view of cutting tool (A) is an explanatory view showing the state of the bolt end before cutting and the positional relationship between the bolt end and both tips, and (b) is the state of the bolt end after cutting, and the positions of the bolt end and both tips. Explanatory diagram showing the relationship Perspective view of a cutting tool of another configuration (A) (b) is explanatory drawing of the fastening method of a Torcia bolt

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bolt 1a Tip part 1A Flat surface 1B Chamfering surface 2 Nut 3 Breaking groove 4 Pin tail 5 H-shaped steel 5a Flange part 6 Gusset plate 7 Mounting hole 8 Washer 10 Bolt end processing apparatus 11 Processing apparatus main body 12 Exterior sleeve 13 Cutting tool 14 Drive Means 15 Casing 16 Output shaft 17 Chuck 18 Power switch 20 Fixing sleeve 21 Bearing 22 Connecting sleeve 23 Extension sleeve 24 Socket holding member 25 Socket 25a Engaging groove 26 Fixing screw 27 Hook 28 Engagement notch 29 Engagement projection 30 Fixing Screw 31 Tool body 31a Discharge groove 32 Shaft portion 33 Bearing 34 Inner blade attachment portion 34a Inner blade attachment surface 34b Corner portion 35 Outer blade attachment portion 35a Outer blade attachment surface 35b Corner portion 36 Inner blade tip 36a Cutting blade 36b End surface 37 Outer blade Tip 37a Cutting edge 37b End face 38 Fixing screw 39 Mounting screw 40 Clamper 13A Cutting tool 31A Tool body 41 Spline groove 45 Suction machine 46 Hose

Claims (4)

An inner blade tip that cuts the central portion of the end face of the shaft-like member substantially flatly;
An outer blade tip that chamfers the outer peripheral portion of the end surface of the shaft-like member by cutting;
A tool body provided with a mounting portion for detachably fixing both tips at the tip in the axial direction;
With
The inner blade tip is fixed to the attachment portion of the tool body so that the rotation outer peripheral side of the cutting blade of the inner blade tip is inclined toward the base side of the tool body from the rotation center side,
The outer blade tip is fixed to the attachment portion of the tool body so that the rotation center side of the cutting edge of the outer blade tip is inclined toward the base side of the tool body from the rotation outer peripheral side,
An end cutting tool for a shaft-like member,   The end cutting tool for a shaft-shaped member according to claim 1, wherein the both tips are made of high-speed steel.   The end part cutting tool for an axial member according to claim 1 or 2, wherein at least the cutting blades of the inner blade tip are arranged in a radial direction of the tool body. The end cutting tool for an axial member according to any one of claims 1 to 3, wherein the cutting edges of the two tips are arranged radially on both sides of the center of rotation of the tool body.

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