JP2015178121A - Shaft holding sleeve and shaft enlargement processing machine, and jig for shaft enlargement processing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability of shaft enlargement processing.SOLUTION: In shaft enlargement processing for enlarging a part of a shaft material W, a shaft holding sleeve 11, which holds an end of the shaft material W by being inserted into a fitting hole 20 of a pressure device for imposing axial compressive stress on the shaft material W, has at least one air circulation passage 36 that reaches a surface of an exposed part 33 exposed to the outside of the fitting hole 20 from a tip surface on the tip side in the direction of insertion into the fitting hole 20.

Description

  The present invention relates to a shaft holding sleeve, a shaft enlargement processing machine, and a jig for a shaft enlargement processing machine.

  Shaft enlargement processing is known as one of the processing methods for forming a relatively large diameter portion in the axial middle portion of the shaft material. As an example of the shaft enlargement processing method, axial compression stress is applied to the shaft material. There is known a method of enlarging a part of a shaft material by adding a bending angle in the state and rotating the shaft material, thereby forming a large diameter portion.

  And as a processing machine which performs the above-mentioned shaft enlargement processing method, it has a pair of shaft holding sleeves which hold both ends of the shaft material, and a fitting hole into which the shaft holding sleeve is inserted, and a reference on which the shaft material is arranged A pair of spindles arranged along a line, and one spindle is moved along the reference line to compress the shaft member in the axial direction, while the other spindle is rotated while being inclined with respect to the reference line. There is known a shaft enlargement processing machine that enlarges a part of a shaft material (see, for example, Patent Document 1).

JP 2013-166168 A

  The shaft holding sleeve is appropriately replaced according to, for example, the size of the shaft member and wear due to contact with the shaft member. When the shaft holding sleeve is inserted into and removed from the fitting hole of the spindle, the inside of the fitting hole is replaced. The air surrounded by the hindrance hinders smooth insertion and removal of the shaft holding sleeve from the fitting hole.

  This invention is made | formed in view of the situation mentioned above, and aims at improving the workability | operativity in a shaft enlargement process.

(1) A shaft holding sleeve that is inserted into a fitting hole of a pressurizing device that applies a shaft compressive stress to a shaft member and holds an end portion of the shaft member in shaft enlargement processing for enlarging a part of the shaft member. A shaft holding sleeve having at least one air flow passage that reaches the surface of the exposed portion exposed to the outside of the fitting hole from the front end surface in the insertion direction to the fitting hole.
(2) A pair of shaft holding sleeves that respectively hold both ends of the shaft member, and a fitting hole into which the pair of shaft holding sleeves are respectively inserted, and both ends are held by the pair of shaft holding sleeves A pressure generator that compresses the shaft material in the axial direction and a load that applies an alternating load in a direction intersecting the axial direction of the shaft material at the intermediate portion of the shaft material that is held at both ends by the pair of shaft holding sleeves. A shaft enlargement processing machine, wherein the pair of shaft holding sleeves are the shaft holding sleeves of (1) above.
(3) The shaft enlargement processing machine according to (2), wherein the shaft holding sleeve is used when the shaft holding sleeve is inserted into the fitting hole, and is provided at an opening edge of the fitting hole. A jig for a shaft enlargement processing machine which is mounted and has a mounting surface on which the shaft holding sleeve can be mounted and which is continuous with the inner peripheral surface of the fitting hole.

  According to the present invention, workability in shaft enlargement processing can be enhanced.

It is a figure which shows typically an example of the shaft enlargement processing method for demonstrating embodiment of this invention. It is a figure which shows typically the other example of the shaft enlargement processing method for demonstrating embodiment of this invention. It is a figure which shows typically the other example of the shaft enlargement processing method for demonstrating embodiment of this invention. It is a figure which shows typically the other example of the shaft enlargement processing method for demonstrating embodiment of this invention. It is a figure which shows typically the other example of the shaft enlargement processing method for demonstrating embodiment of this invention. It is a side view of an example of the shaft enlargement processing machine which implements the shaft enlargement processing method of FIG. It is sectional drawing of the shaft holding sleeve and spindle of the shaft enlargement processing machine of FIG. FIG. 8 is a front view of the shaft holding sleeve of FIG. 7. It is sectional drawing of the modification of the shaft holding sleeve of FIG. It is a side view of the other modification of the shaft holding sleeve of FIG. It is a perspective view of the other modification of the axis | shaft holding sleeve of FIG. It is a side view of an example of a jig for a shaft enlargement processing machine for explaining an embodiment of the present invention. It is sectional drawing of the other example of the jig for shaft enlargement processing machines for demonstrating embodiment of this invention. It is a front view of the jig for shaft enlargement processing machines of FIG.

  1 to 5 schematically show various examples of a shaft enlargement processing method for explaining an embodiment of the present invention.

  The shaft enlargement processing method shown in FIG. 1 enlarges a part of the shaft material W by rotating the shaft material W by adding a bending angle in a state where axial compression stress is applied to the shaft material W.

  As shown in FIG. 1A, both end portions of the shaft member W are inserted into a pair of shaft holding sleeves 1a and 1b arranged to face each other on the reference line A. Then, both end portions of the shaft material W are in contact with the bottom portions of the shaft holding sleeves 1a and 1b, respectively, and the shaft material W is sandwiched between the pair of shaft holding sleeves 1a and 1b. A predetermined interval D is provided between the pair of shaft holding sleeves 1a and 1b, and the interval D is determined according to the axial length and the outer diameter of the enlarged portion formed in the shaft member W.

  As shown in FIG. 1B, the shaft holding sleeve 1b is translated along the reference line A, and the shaft member W sandwiched between the pair of shaft holding sleeves 1a and 1b is compressed in the axial direction. Then, the shaft holding sleeve 1a is inclined with respect to the reference line A and is rotationally driven, and the shaft member W sandwiched between the pair of shaft holding sleeves 1a and 1b is centered on the bending center O on the reference line A. It is bent and rotated around the axis of the shaft W. As the shaft member W is bent and rotated, an alternating load is applied to the curved portion (intermediate portion) of the shaft member W in the direction intersecting the axial direction of the shaft member W on the inner side and the outer side in the bending direction.

  As shown in FIG. 1C, since the shaft member W is compressed in the axial direction, the inside of the curved portion of the shaft member W swells due to plastic deformation, and the bulge due to plastic deformation extends over the entire circumference. It grows and the curved part of the shaft W is enlarged.

  As shown in FIG. 1D, after the distance between the pair of shaft holding sleeves 1a and 1b reaches the target distance (the axial length of the enlarged portion of the shaft material W), the compression of the shaft material W is stopped, Then, the shaft holding sleeve 1a inclined with respect to the reference line A is disposed again along the reference line A, and the shaft member W is bent back. By the above procedure, the enlargement process for the shaft member W is completed, and the rotation of the shaft member W is stopped.

  Thereafter, as shown in FIG. 1E, the shaft member W is detached from the pair of shaft holding sleeves 1a and 1b.

  The shaft enlargement processing method shown in FIG. 2 is common to the shaft enlargement processing method of FIG. 1 in that an alternating load is applied to the curved portion (intermediate portion) of the shaft member W by bending and rotating around the shaft member W. Instead of tilting the shaft holding sleeve 1a with respect to the reference line A, the shaft member W is bent by sliding the shaft holding sleeve 1a in a direction intersecting the reference line A.

  In the shaft enlargement processing method shown in FIG. 3, the end of the shaft member W is rotatably held in an unconstrained state by one shaft holding sleeve 1a, and the end of the shaft member W is held by the other shaft holding sleeve 1b. Is held in a non-rotatable restrained state, and the shaft holding sleeve 1a and the end portion of the shaft material W held by the shaft holding sleeve 1a are turned around the reference line A, whereby the shaft material W is bent and the shaft An alternating load is applied to the curved portion (intermediate portion) of the material W.

  In the shaft enlargement processing method shown in FIG. 4, the shaft holding sleeves 1a and 1b each hold the end of the shaft member W in a non-rotatable constrained state, and the one shaft holding sleeve 1a reciprocates around the reference line A. By rotating, an alternating load is applied to the intermediate part of the shaft member W.

  In the shaft enlargement processing method shown in FIG. 5, instead of displacement and rotation of the shaft holding sleeves 1 a and 1 b and the shaft material W, bending or torsional vibration is applied to the shaft material W from the vibration generator OSC, thereby An alternating load is applied to the middle part.

  FIG. 6 shows a configuration of an example of a shaft enlargement processing machine that performs the shaft enlargement processing method shown in FIG. 1.

  A shaft enlargement processing machine 10 shown in FIG. 6 includes a pair of shaft holding sleeves 11 that hold the end portions of the shaft material, and a pair of holder units that are spaced apart from each other along a reference line A on which the shaft material is disposed. 12a, 12b. One holder unit 12a is supported by the base 13 so as to be tiltable with respect to the reference line A, and the other holder unit 12b is supported by the base 13 so as to be movable along the reference line A. Yes.

  The holder units 12a and 12b include a spindle 14 to which the shaft holding sleeve 11 is mounted, a housing 15 that rotatably supports the spindle 14, and an end of the shaft member inserted into the shaft holding sleeve 11 from the shaft holding sleeve 11. The cylinders 16 for extruding are respectively included, and the spindles 14 of the holder units 12a and 12b are arranged on the reference line A.

  The shaft enlargement processing machine 10 includes a translation drive unit 17 that moves the holder unit 12b along the reference line A, a tilting unit 18 that tilts the holder unit 12a with respect to the reference line A, and a spindle 14 of the holder unit 12a. And a rotation drive unit 19 that rotationally drives the motor. The holder unit 12a, 12b and the translation drive unit 17 constitute a pressurizing device that compresses the shaft material in the axial direction, and the holder units 12a, 12b, the tilting unit 18, and the rotation drive unit 19 are arranged in the middle part of the shaft material. A load generator that applies an alternating load in a direction intersecting the axial direction (reference line A) of the shaft member is configured.

  7 and 8 show the configuration of the shaft holding sleeve 11 and the spindle 14.

  The spindle 14 is provided with a fitting hole 20 into which the shaft holding sleeve 11 is inserted, and a pin insertion hole 21 connected to the fitting hole 20. A pressure receiving plate 22 that receives the shaft holding sleeve 11 is inserted into the fitting hole 20, and the pressure receiving plate 22 is abutted against and fixed to a step 23 formed inside the fitting hole 20. The pin insertion hole 21 is provided through the spindle 14 along the central axis (reference line A) of the spindle 14, and the knock pin 24 of the cylinder 16 (see FIG. 6) is inserted into the pin insertion hole 21. ing.

  The shaft holding sleeve 11 includes a cylindrical portion 30 that accommodates an end portion of the shaft member, and a metal 31 that is inserted into the cylindrical portion 30. The cylindrical portion 30 includes an accommodating portion 32 that is accommodated in the fitting hole 20 in a state where the shaft holding sleeve 11 is inserted into the fitting hole 20 of the spindle 14, and an exposed portion 33 that is exposed outside the fitting hole 20. Have. The exposed portion 33 is formed to have a smaller diameter than the accommodating portion 32, and a step 34 is formed at the connecting portion between the exposed portion 33 and the accommodating portion 32. The metal 31 forms the bottom of the shaft holding sleeve 11, is supported by the knock pin 24, receives the end surface of the shaft material, and is pressed by the knock pin 24 to insert the end of the shaft material inserted into the shaft holding sleeve 11. Push out from the shaft holding sleeve 11.

  In the shaft holding sleeve 11 inserted into the fitting hole 20 of the spindle 14, the step 34 of the cylindrical portion 30 is pressed by the flange pipe 35 fastened to the opening end of the spindle 14 in which the fitting hole 20 is opened. Fixed to the spindle 14.

  The shaft holding sleeve 11 is appropriately replaced according to the dimensions of the shaft material. Further, the shaft holding sleeve 11 receives the reaction force of the alternating load applied to the shaft material, and a relatively large load acts on the surface 30 a of the opening portion of the shaft holding sleeve 11 in particular. Therefore, the shaft holding sleeve 11 is worn out by repeated use and is appropriately replaced.

  When the shaft holding sleeve 11 is inserted into and removed from the fitting hole 20 of the spindle 14 with the replacement of the shaft holding sleeve 11, the fitting hole 20 is formed by the shaft holding sleeve 11, the spindle 14, the pressure receiving plate 22, and the knock pin 24. The shaft holding sleeve 11 is provided with an air flow passage that communicates the inside and the outside of the fitting hole 20.

  In this example, the air flow passage of the shaft holding sleeve 11 is constituted by a groove 36 formed on the outer peripheral surface of the housing portion 32. The groove 36 is provided so as to extend along the axial direction of the shaft holding sleeve 11 from the front end surface (bottom side) of the shaft holding sleeve 11 in the insertion direction to the fitting hole 20. Has reached. Although at least one groove 36 as an air flow passage is sufficient, a plurality of grooves 36 may be provided at intervals in the circumferential direction of the outer peripheral surface of the accommodating portion 32 as in the illustrated example.

  Without the groove 36 as an air flow passage, the inside of the fitting hole 20 becomes negative with respect to the atmospheric pressure when the shaft holding sleeve 11 is removed, and the shaft holding sleeve 11 is fitted when the shaft holding sleeve 11 is inserted. The inside of the joint hole 20 becomes a positive pressure with respect to the atmospheric pressure, and the smooth insertion and removal of the shaft holding sleeve 11 is prevented. On the other hand, the inside of the fitting hole 20 is communicated with the outside by the groove 36, whereby the inside of the fitting hole 20 is maintained at the atmospheric pressure or the differential pressure from the atmospheric pressure is reduced. Accordingly, the shaft holding sleeve 11 can be smoothly inserted and removed, and the workability of replacing the shaft holding sleeve 11 can be improved. As a result, the workability in the shaft enlargement process can be improved.

  The air flow passage of the shaft holding sleeve 11 is not limited to the groove 36 as long as it reaches the surface of the exposed portion 33 from the distal end surface in the insertion direction of the shaft holding sleeve 11 into the fitting hole 20. Absent. For example, as shown in FIG. 9, the air flow passage can be configured by a through hole 37 that reaches the end surface on the opposite side from the tip surface of the shaft holding sleeve 11.

  In addition, as shown in FIG. 10, a mounting portion 39 to which the hanging bracket 38 is detachably fastened may be provided on the outer peripheral surface of the shaft holding sleeve 11. The shaft holding sleeve 11 has a weight of about 60 kg depending on the shaft material to be held, and has a weight of about 60 kg. The shaft holding sleeve 11 is a relatively heavy item. The burden on the operator in the replacement work of the sleeve 11 can be reduced. Thereby, the workability | operativity of replacement | exchange of the shaft holding sleeve 11 can be improved further.

  In the example shown in FIGS. 6 and 7, the flange pipe 35 that fixes the shaft holding sleeve 11 to the spindle 14 is formed separately from the cylindrical portion 30 of the shaft holding sleeve 11. As described above, the flange portion 40 may be provided integrally with the cylindrical portion 30, and in this case, a handle 41 as a gripping portion may be provided on the flange portion 40. With the handle 41, the shaft holding sleeve can be easily inserted into and removed from the fitting hole 20 of the spindle 14, and the workability of replacing the shaft holding sleeve can be further improved.

  Further, in order to suppress wear of the shaft holding sleeve 11 due to contact with the shaft material, it is preferable to use a hard material as the material of the shaft holding sleeve 11. By suppressing the wear of the shaft holding sleeve 11, the replacement frequency of the shaft holding sleeve 11 can be lowered, and the workability in shaft enlargement processing can be improved.

  As the base material for forming the shaft holding sleeve 11, those having Rockwell hardness (JIS G 0202) HRC58 or higher can be suitably used, such as die steel such as SKD11, high-speed steel such as SKH51, semi-high-speed steel, etc. Can be illustrated.

  Furthermore, from the viewpoint of suppressing the wear of the shaft holding sleeve 11, the shaft holding sleeve 11 may be subjected to surface hardening treatment. When the surface hardening treatment is performed, the surface property is Vickers hardness (JIS Z 2244) HV1200. The above is preferable, HV3000 or more is more preferable, and smoothness is preferable. Examples of such surface hardening treatment include film formation such as a vanadium-based film, a chromium-based film, a titanium-based film, and a DLC (diamond-like carbon) film, nitriding treatment, and the like.

  The surface hardening treatment is applied to at least the surface 30a of the opening of the shaft holding sleeve 11, and may be applied to the entire inner peripheral surface of the cylindrical portion 30 including the surface 30a of the opening, or the surface of the shaft holding sleeve 11 It may be given to the whole.

  When forming a film as the surface hardening treatment, the film may be composed of a single layer film of the various films listed above or may be composed of one or more multilayer films. Examples of the film forming method include salt bath immersion (thermal reaction deposition diffusion method), CVD (chemical vapor deposition method), PVD (physical vapor deposition method), PCVD (plasma CVD method), and the like. it can.

  Further, from the viewpoint of improving workability in shaft enlargement processing, a jig may be used when the shaft holding sleeve 11 is replaced.

  FIG. 12 shows a configuration of an example of a jig for a shaft enlargement processing machine for explaining an embodiment of the present invention.

  A jig 50 shown in FIG. 12 includes a plurality of (only one is shown in the figure) columnar guide bars 51. These guide rods 51 are fastened to screw holes located at the vertical lower edge of the fitting hole 20 among the screw holes at the opening end of the spindle 14 to which the flange pipe 35 of the shaft holding sleeve 11 is fastened. It is attached to the opening edge of the fitting hole 20.

  The shaft holding sleeve 11 is placed on these guide rods 51 across a plurality of guide rods 51. The outer peripheral surface of each guide rod 51 is flush with the inner peripheral surface of the fitting hole 20 along the generatrix of the outer peripheral surface that is in contact with the mounted shaft holding sleeve 11. It is smoothly moved from above the guide rod 51 to the fitting hole 20 and from the fitting hole 20 to the guide rod 51. Thereby, the insertion / extraction operation of the shaft holding sleeve 11 becomes easy, and the workability of exchanging the shaft holding sleeve 11 can be further improved.

  Further, in the illustrated example, a large-diameter stopper portion 52 is provided at the distal end portion of each guide rod 51, and these stopper portions 52 are used when the shaft holding sleeve 11 is removed from the fitting hole 20. When the shaft holding sleeve 11 is excessively moved toward the distal end side of the guide rod 51, the shaft holding sleeve 11 comes into contact with the shaft holding sleeve 11 to prevent the shaft holding sleeve 11 from falling off.

  After the shaft holding sleeve 11 is inserted into the fitting hole 20, the guide rod 51 is removed from the spindle 14, the flange pipe 35 is fastened to the spindle 14 instead of the guide rod 51, and the shaft holding sleeve 11 is attached to the spindle 14. Fixed.

  FIG. 13 and FIG. 14 show the configuration of another example of a jig for a shaft enlargement processing machine for explaining the embodiment of the present invention.

  The jig 60 shown in FIGS. 13 and 14 is formed in an annular shape, and is fitted on the spindle 14 by being externally fitted to the open end of the spindle 14. The jig 60 has a semi-cylindrical support portion 62 formed to protrude in the axial direction from an edge of the opening 61 that exposes the fitting hole 20, and the shaft holding sleeve 11 is a support portion. 62. The inner peripheral surface of the support portion 62 is flush with the inner peripheral surface of the fitting hole 20, and the shaft holding sleeve 11 is supported from the support portion 62 to the fitting hole 20 and from the fitting hole 20. It is moved smoothly on the part 62. According to the jig 60 of this example, the spindle 14 can be easily attached and detached, and the workability of exchanging the shaft holding sleeve 11 can be further improved.

  The shaft enlargement processing machine 10 for carrying out the shaft enlargement processing method shown in FIG. 1 has been described above, and the shaft holding sleeve, the shaft enlargement processing machine, and the jig for the shaft enlargement processing machine according to the present invention have been described. The shaft enlargement processing machine that performs the shaft enlargement processing method shown in FIG. 5 differs only in the operation method of the holder unit and spindle for applying an alternating load to the intermediate portion of the shaft material. In this case, the configurations of the shaft holding sleeve and the shaft enlargement processing jig described above can be applied.

  Next, various production examples of the shaft holding sleeve 11 described above and life evaluation thereof will be described.

  The shaft holding sleeve of Production Example 1 uses semi-high-speed steel as a base material and omits the surface hardening treatment. The shaft holding sleeve of Production Example 2 uses semi-high-speed steel as a base material and is subjected to nitriding treatment as a surface hardening treatment. The shaft holding sleeve of Production Example 3 uses SKH51 (high-speed steel) as a base material, and has a VC (vanadium carbide) film formed by a TD process (registered trademark) which is a kind of salt bath immersion method as a surface hardening treatment. . Table 1 shows the base material hardness and surface properties of the shaft holding sleeves of Production Examples 1 to 3.

  With respect to each of the shaft holding sleeves of Production Examples 1 to 3, the shaft enlargement processing is repeatedly performed under the same conditions on the shaft enlargement processing machine 10 described above, and the number of processing until the visible galling (adhesion wear) occurs. Lifespan was evaluated. The evaluation results are shown in Table 1. From the evaluation results shown in Table 1, it is understood that the wear of the shaft holding sleeve due to the contact with the shaft material can be suppressed by performing the surface hardening treatment. Further, by suppressing the wear of the shaft holding sleeve, the replacement frequency of the shaft holding sleeve can be lowered, and the workability in the shaft enlargement process can be improved.

  As described above, the following items are disclosed in this specification.

(1) A shaft holding sleeve that is inserted into a fitting hole of a pressurizing device that applies a shaft compressive stress to a shaft member and holds an end portion of the shaft member in shaft enlargement processing for enlarging a part of the shaft member. A shaft holding sleeve having at least one air flow passage that reaches the surface of the exposed portion exposed to the outside of the fitting hole from the front end surface in the insertion direction to the fitting hole.
(2) The shaft holding sleeve according to (1), wherein the air flow passage is a groove formed on an outer peripheral surface.
(3) The shaft holding sleeve according to (1), wherein the air flow passage is a through hole that reaches an end surface on the opposite side from the tip surface.
(4) The shaft holding sleeve according to any one of (1) to (3), wherein a mounting portion to which the hanging bracket can be attached and detached is provided on the outer peripheral surface.
(5) The shaft holding sleeve according to any one of (1) to (4) above, wherein a gripping portion is provided in the exposed portion.
(6) The shaft holding sleeve according to any one of the above (1) to (5), wherein at least the surface of the opening into which the end portion of the shaft member is inserted is subjected to surface hardening treatment.
(7) The shaft holding sleeve according to (6), wherein the surface-hardened surface has a Vickers hardness of HV1200 or more.
(8) A pair of shaft holding sleeves that respectively hold both ends of the shaft member and a fitting hole into which the pair of shaft holding sleeves are inserted, and both ends are held by the pair of shaft holding sleeves A pressure generator that compresses the shaft material in the axial direction and a load that applies an alternating load in a direction intersecting the axial direction of the shaft material at the intermediate portion of the shaft material that is held at both ends by the pair of shaft holding sleeves. A shaft enlargement processing machine, wherein the pair of shaft holding sleeves is any one of the shaft holding sleeves of (1) to (7).
(9) A shaft enlargement processing jig used when the shaft holding sleeve is inserted into the fitting hole in the shaft enlargement processing machine of (8) above, and is attached to the opening edge of the fitting hole. A jig for a shaft enlargement processing machine, on which the shaft holding sleeve can be placed, and has a placement surface continuous with the inner peripheral surface of the fitting hole.

DESCRIPTION OF SYMBOLS 1a Shaft holding sleeve 10 Shaft enlargement processing machine 11 Shaft holding sleeve 12a Holder unit 12b Holder unit 13 Base 14 Spindle 15 Housing 16 Cylinder 17 Translation drive part 18 Tilt part 19 Rotation drive part 20 Fitting hole 30 Tube part 31 Gold 31 Housing part 33 Exposed part 36 Groove (air flow passage)
37 Through hole (air flow passage)
38 Hanging bracket 39 Mounting portion 40 Flange portion 41 Handle (gripping portion)
50 Jig 60 Jig A Reference line W Shaft material

Claims (9)

In shaft enlargement processing for enlarging a part of the shaft material, a shaft holding sleeve that is inserted into a fitting hole of a pressurizing device that applies axial compression stress to the shaft material and holds an end portion of the shaft material,
A shaft holding sleeve having at least one air flow passage that reaches the surface of the exposed portion exposed to the outside of the fitting hole from the front end surface in the insertion direction to the fitting hole. The shaft holding sleeve according to claim 1,
The air flow passage is a shaft holding sleeve which is a groove formed on an outer peripheral surface. The shaft holding sleeve according to claim 1,
The airflow passage is a shaft holding sleeve that is a through hole that reaches an end surface on the opposite side from the tip surface. The shaft holding sleeve according to any one of claims 1 to 3,
A shaft holding sleeve in which a mounting portion to which a hanging bracket can be attached and detached is provided on the outer peripheral surface. The shaft holding sleeve according to any one of claims 1 to 4,
A shaft holding sleeve having a gripping portion provided on the exposed portion. The shaft holding sleeve according to any one of claims 1 to 5,
A shaft holding sleeve in which at least the surface of the opening into which the end of the shaft member is inserted is subjected to surface hardening treatment. The shaft holding sleeve according to claim 6, wherein
A shaft holding sleeve having a surface-hardened surface having a Vickers hardness of HV1200 or more. A pair of shaft holding sleeves that respectively hold both ends of the shaft material;
A pressurizing device having a fitting hole into which the pair of shaft holding sleeves are respectively inserted, and compressing the shaft member held at both ends by the pair of shaft holding sleeves in the axial direction;
A load generator for applying an alternating load in a direction intersecting the axial direction of the shaft member to an intermediate portion of the shaft member held at both ends by the pair of shaft holding sleeves;
With
The shaft enlargement processing machine according to claim 1, wherein the pair of shaft holding sleeves are shaft holding sleeves according to claim 1. The shaft enlargement processing machine according to claim 8, wherein the shaft holding sleeve is used when the shaft holding sleeve is inserted into the fitting hole.
A jig for a shaft enlargement processing machine, which is mounted on the opening edge of the fitting hole, on which the shaft holding sleeve can be placed, and has a placing surface that is flush with the inner peripheral surface of the fitting hole.

Images