Jig, and deterioration determination method

Abstract

To provide: a jig for determining the deterioration of a tool; and a deterioration determination method for determining the deterioration of the tool.SOLUTION: The jig comprises: a weight which is formed with a recessed part, and raised together with a retaining ring; and a formation part which is formed with a positioning part for positioning the weight and a guide surface part. Therein: a peripheral surface of one portion of the retaining ring is held at a tip of a tool, one surface of the one portion is supported by the tip, meanwhile, the other portion of the retaining ring is inserted into the recessed part with the other surface of the one portion arranged to face upward; the weight is raised when the tool, which is not deteriorated, is raised with the other portion of the retaining ring being inserted in the recessed part; the guide surface part guides the other portion into the recessed part when the tip is slid.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a jig used for determining deterioration of a tool, and a deterioration determination method for determining deterioration of a tool. [Background technology]

[0002] Patent document 1 describes a press-in blade of a retaining ring press-in device, which is slidably mounted on the base of the retaining ring press-in device, and has a pair of arms extending from a base in the sliding direction, with both arms having a support portion and an engagement portion at their tips, and an engagement groove in the sliding direction that is narrower than the diameter of a pilot pin fixed to the base side spanning between both arms, and when the press-in blade is in the retracted position, the pilot pin engages with the engagement groove and both arms spread apart, allowing the retaining ring to be placed on the support portion of the press-in blade, while when the press-in blade is in the advanced position, the pilot pin disengages from the engagement groove, allowing the retaining ring to be clamped by the engagement portion of the press-in blade and pressed into the portion to be pressed in. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 04-009227 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a tool that is used to clamp a retaining ring such as an E-ring and attach the clamped retaining ring to an object. This tool supports one side of a part of the retaining ring and clamps the peripheral surface of a part of the supported retaining ring. In such a tool, the part that clamps the retaining ring is deteriorated by rubbing against the retaining ring.

[0005] An object of the present disclosure is to provide a jig for determining deterioration of a tool, and a deterioration determination method for determining deterioration of a tool. [Means for solving the problem]

[0006] The jig according to the first aspect of the present disclosure is characterized in that it has a recess formed in which a portion of a peripheral surface of a retaining ring, one face of which is supported by the tip portion of a tool, is inserted with the other face of the portion facing up, and has a weight that rises together with the retaining ring when the undeteriorated tool is raised with the other part inserted in the recess, a positioning portion that positions the weight, and a forming portion formed with a guide surface portion that guides the other part into the recess by sliding the tip portion.

[0007] A jig according to a second aspect of the present disclosure is characterized in that, in the jig described in the first aspect, the tip portion and the weight are separated when the other part is inserted into the recess and abuts against the bottom of the recess.

[0008] A jig according to a third aspect of the present disclosure is characterized in that, in the jig described in the first aspect, the weight comprises a main body portion in which the recess is formed and a protrusion having a circular cross section that protrudes upward, and an insertion portion in which a through hole is formed through which the protrusion is inserted.

[0009] A jig according to a fourth aspect of the present disclosure is the jig described in the third aspect, characterized in that an outer peripheral surface of the protrusion is formed with a male thread, and an inner peripheral surface of the through hole of the insertion portion is formed with a female thread that meshes with the male thread formed on the protrusion.

[0010] A jig according to a fifth aspect of the present disclosure is characterized in that, in the jig described in the first aspect, the weight comprises a main body portion in which the recess is formed and in which a hole having a circular cross section that opens upwardly is formed, and an insertion portion in which a cylindrical portion to be inserted into the hole is formed.

[0011] A jig according to a sixth aspect of the present disclosure is characterized in that, in the jig described in the fifth aspect, a female thread is formed on the inner surface of the hole portion, and a male thread is formed on the outer surface of the cylindrical portion of the insertion portion, which meshes with the female thread formed in the hole portion.

[0012] A deterioration determination method according to a seventh aspect of the present disclosure is characterized by comprising a first step of clamping a portion of a peripheral surface of a retaining ring with a tip end of a tool and supporting one face of the portion with the tip end, a second step of inserting the other face of the portion of the retaining ring protruding from the tip end into a recess formed in a weight with the other face of the portion facing up, and a third step of raising the tool and determining that the retaining ring is deteriorated if the retaining ring comes off the tip end. Effect of the Invention

[0013] According to the jig according to the first aspect of the present disclosure, deterioration of a tool can be determined.

[0014] The jig according to the second aspect of the present disclosure makes it possible to effectively determine deterioration of the tool compared to a case in which the tip of the tool and the weight are in contact with each other with the other part of the retaining ring abutting against the bottom of the recess.

[0015] According to the jig according to the third aspect of the present disclosure, the weight of the weight can be adjusted by replacing the insertion part.

[0016] According to the jig of the fourth aspect of the present disclosure, the posture of the insertion portion relative to the main body portion can be stabilized compared to when a gap is provided between the outer peripheral surface of the protrusion and the inner peripheral surface of the through hole of the insertion portion.

[0017] According to the jig according to the fifth aspect of the present disclosure, the weight of the weight can be adjusted by replacing the insertion part.

[0018] According to the jig according to the sixth aspect of the present disclosure, the posture of the insertion portion relative to the main body portion can be stabilized compared to when a gap is provided between the inner surface of the hole portion and the outer surface of the cylindrical portion.

[0019] According to the deterioration determining method according to the seventh aspect of the present disclosure, deterioration of a tool can be determined. [Brief description of the drawings]

[0020] [Figure 1]1 is a perspective view showing a retaining ring attachment tool whose deterioration is determined by a jig according to a first embodiment of the present disclosure. FIG. [Diagram 2] 3A and 3B are enlarged perspective views showing a tip portion of a retaining ring attachment tool, the deterioration of which is determined by a jig according to a first embodiment of the present disclosure. [Diagram 3] FIG. 2 is a perspective view showing a jig according to the first embodiment of the present disclosure. [Figure 4] FIG. 2 is an enlarged perspective view showing a weight provided in the jig according to the first embodiment of the present disclosure. [Diagram 5] 2 is an enlarged perspective view showing a forming portion provided in the jig according to the first embodiment of the present disclosure. FIG. [Figure 6] 1A to 1C are schematic diagrams used to explain the steps of a degradation determination method according to a first embodiment of the present disclosure. [Figure 7] 1A to 1C are schematic diagrams used to explain the steps of a degradation determination method according to a first embodiment of the present disclosure. [Figure 8] 1A to 1C are schematic diagrams used to explain the steps of a degradation determination method according to a first embodiment of the present disclosure. [Figure 9] 1A and 1B are schematic diagrams used to explain the steps of a degradation determination method according to a first embodiment of the present disclosure. [Figure 10] FIG. 11 is an enlarged perspective view showing a weight provided in a jig according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] First Embodiment An example of a jig and a deterioration determination method according to a first embodiment of the present disclosure will be described with reference to Fig. 1 to Fig. 9. Specifically, an example of a jig for determining deterioration of a retaining ring fitting tool used to clamp a retaining ring such as an E-ring and attach the clamped retaining ring to an object, and an example of a deterioration determination method for determining deterioration of the retaining ring fitting tool will be described.

[0022] In the figure, arrow H indicates the up-down direction (vertical direction) of the jig, arrow W indicates the width direction (horizontal direction) of the jig, and arrow L indicates the depth direction (horizontal direction) of the jig. The up-down direction, width direction, and depth direction are perpendicular to each other.

[0023] First, the retaining ring mounting tool for which deterioration is judged will be described. Note that the retaining ring mounting tool will be described in the position in which deterioration is judged using a jig.

[0024] (Retaining ring installation tool 100) Retaining ring attachment tool 100 (hereinafter referred to as "tool 100") is a tool for attaching a retaining ring 200 to a groove of a shaft member, and as shown in Fig. 1, has a gripping part 110 that is held by an operator, and an extension part 120 that extends from gripping part 110 and clamps retaining ring 200 at a tip part 122. Retaining ring attachment tool 100 is one example of a tool.

[0025] 1, the retaining ring 200 is a so-called E-ring (JIS B 2805), and has an outer peripheral surface 200a and an inner peripheral surface 200b that are arc-shaped, and three projections 202 that protrude inward of the retaining ring 200 are formed on the inner peripheral surface 200b. Furthermore, the retaining ring 200 is formed with a lower surface 200c that faces downward and an upper surface 200d that faces upward. The outer peripheral surface 200a is an example of a peripheral surface, the lower surface 200c is an example of one surface, and the upper surface 200d is an example of the other surface.

[0026] [Gripping part 110] As shown in FIG. 1, the grip portion 110 is formed of a resin material and has a rectangular shape that extends in the depth direction and has a cross section that extends in the width direction.

[0027] [Extension part 120] 1, the extension portion 120 extends from one end portion (left end portion in the figure) in the depth direction of the grip portion 110 to one side in the depth direction (left side in the figure), and is formed using sheet metal. The plate surface of the extension portion 120 faces the up-down direction, and the extension portion 120 is formed with a slit 130 extending in the depth direction to divide the extension portion 120 in the width direction. In addition, a tip portion 122 that is wider than other portions is formed at one end portion in the depth direction of the extension portion 120.

[0028] Specifically, the slit 130 is formed in the extending portion 120 except for the other end portion in the depth direction, and the tip portion 122 is divided in the width direction by the slit 130. The dividing portion 122a and the dividing portion 122b, which are divided in the width direction at the tip portion 122, are adapted to approach and separate from each other in the width direction by the extending portion 120 being elastically deformed in the width direction.

[0029] 2(A), the divided portions 122a, 122b of the tip portion 122 are respectively formed with clamping surfaces 124a, 124b for clamping an outer circumferential surface 200a of the other end portion in the depth direction of the retaining ring 200 from the width direction, and supporting surfaces 126a, 126b for supporting a lower surface 200c of the other end portion in the depth direction of the retaining ring 200 from below. The other end portion in the depth direction of the retaining ring 200 is an example of a part of the retaining ring 200.

[0030] 2A, a semicircular cutout 120a is formed in the tip portion 122 when viewed from above. Furthermore, the tip portion 122 is divided in the width direction by the slit 130 into divided portions 122a and 122b, which are symmetrical with respect to the center line CL01 in the depth direction.

[0031] The dividing portions 122a, 122b are formed with clamping surfaces 124a, 124b that face the center of the semicircular cutout portion 120a when viewed from above, and support surfaces 126a, 126b that protrude from the lower ends of the clamping surfaces 124a, 124b toward the center of the semicircular cutout portion 120a and face upward.

[0032] In this configuration, with the tip 122 of the extension portion 120 clamping the retaining ring 200, one end portion in the depth direction of the retaining ring 200 protrudes from the tip 122 of the extension portion 120 to one end side in the depth direction (the left end side in the figure) as shown in Fig. 2(B). The amount of protrusion of the retaining ring 200 from the tip 122 of the extension portion 120 is set to d1. The width of the portion of the retaining ring 200 protruding from the tip 122 of the extension portion 120 is set to b1. The thickness of the retaining ring 200 is set to t1. The one end portion in the depth direction of the retaining ring 200 is an example of the other portion of the retaining ring 200.

[0033] (Jig 10) As shown in FIG. 3, the jig 10 includes a weight 20 and a forming portion 40. [Weight 20] 3 and 4, the weight 20 includes a main body 22 and a nut 30. The nut 30 is an example of an insertion portion.

[0034] The main body 22 is rectangular and has a pair of side surfaces 22a facing in the width direction, a back surface 22b facing one side in the depth direction (left side in the figure), and a front surface 22c facing the other side in the depth direction (right side in the figure). The main body 22 also has a bottom surface 22d facing downward and a top surface 22e facing upward.

[0035] Furthermore, a recess 24 recessed in the depth direction is formed on the front surface 22c of the main body 22. Specifically, the recess 24 is formed in the center portion in the up-down direction of the main body 22, and is semicircular when viewed from above (see-through). Also, the opening of the recess 24 is rectangular and extends in the width direction when viewed from the other side in the depth direction.

[0036] Furthermore, the depth of the recess 24 is set to d2, and the depth d2 is shorter than the amount of protrusion d1 (see FIG. 2(B)) from the tip end 122 of the extension portion 120 of the retaining ring 200. Moreover, the opening width of the recess 24 is set to b2, and the opening width b2 is wider than the width b1 (see FIG. 2(B)) of the portion of the retaining ring 200 that protrudes from the tip end 122 of the extension portion 120. Moreover, the opening height of the recess 24 is set to t2, and the opening height t2 is higher than the thickness t1 of the retaining ring 200.

[0037] Furthermore, a protruding portion 26 having a circular cross section that protrudes upward is provided on the top surface 22e of the main body 22, and a male thread is formed on the outer circumferential surface of the protruding portion 26. Meanwhile, a through hole 30a is formed in the nut 30, and a female thread is formed on the inner circumferential surface of the through hole 30a. The nut 30 is screwed into and engages with the protruding portion 26, which has a male thread formed on its outer circumferential surface.

[0038] In this configuration, when determining deterioration of tool 100, retaining ring 200, which is a portion protruding from tip 122 of extension 120, is inserted into recess 24 of weight 20. Then, retaining ring 200 is abutted against the bottom of recess 24. In this state, tip 122 of tool 100 and weight 20 are separated from each other (see FIG. 8).

[0039] [Forming part 40] 3 and 5, the forming section 40 is rectangular parallelepiped, and has a pair of side surfaces 42a facing in the width direction, a back surface 42b facing one side in the depth direction (left side in the figure), and a front surface 42c facing the other side in the depth direction (right side in the figure). Furthermore, the forming section 40 has a bottom surface 42d facing downward and a top surface 42e facing upward.

[0040] Further, a concave positioning recess 44 is formed on the top surface 42e of the forming portion 40, into which the lower end portion of the weight 20 is inserted and which determines the position of the weight 20 relative to the forming portion 40. The positioning recess 44 is an example of a positioning portion.

[0041] Specifically, the positioning recess 44 has a rectangular parallelepiped shape as shown in Fig. 5. The positioning recess 44 is surrounded by a pair of side surfaces 46a facing in the width direction, a back surface 46b facing the other side in the depth direction (the right side in the figure), a front surface 46c facing one side in the depth direction (the left side in the figure), and a bottom surface 46d facing upward.

[0042] Furthermore, the other widthwise side portion of the top surface 42e of the forming portion 40 relative to the positioning recess 44 is configured as a guide surface portion 48 that guides the retaining ring 200 protruding from the tip portion 122 of the tool 100 into the recess 24 by sliding the tip portion 122 of the tool 100.

[0043] In this configuration, as shown in FIG. 3, when the lower end portion of the weight 20 is inserted into the positioning recess 44, the weight 20 is sandwiched between a pair of side surfaces 46a in the width direction, so that the position of the weight 20 in the width direction is determined. Here, the dimension between the pair of side surfaces 22a of the weight 20 is smaller than the dimension between the pair of side surfaces 46a facing the width direction of the positioning recess 44. Therefore, "the weight 20 is sandwiched between a pair of side surfaces 46a in the width direction" means that the weight 20 is sandwiched in the width direction while being spaced apart (having a gap) from at least one of the side surfaces 46a. Furthermore, the position of the weight 20 in the depth direction is determined by bringing the back surface 22b of the weight 20 into contact with the back surface 46b of the recess 44. Furthermore, the position of the weight 20 in the up-down direction is determined by bringing the bottom surface 22d of the weight 20 into contact with the bottom surface 46d of the recess 44. In this way, when the weight 20 is positioned, the front surface 22c of the weight 20 and the front surface 46c of the recess 44 are spaced apart.

[0044] 7 and 8, by sliding the tip 122 of the tool 100 on the guide surface portion 48, the portion of the retaining ring 200 protruding from the tip 122 is guided into the recess 24. That is, the depth of the positioning recess 44 is determined so that the retaining ring 200 clamped by the tip 122 of the tool 100 in contact with the guide surface portion 48 faces the recess 24 of the weight 20 in the depth direction. In this manner, by sliding the tip 122 of the tool 100 (the plate surface facing downward at one end portion in the depth direction of the extension portion 120) on the guide surface portion 48, the application of unnecessary external force to the retaining ring 200 is suppressed when the portion of the retaining ring 200 protruding from the tip 122 of the tool 100 is inserted into the recess 24 of the weight 20. Specifically, the tip 122 of the tool 100 is inclined vertically with respect to the depth direction, so that the retaining ring 200 strikes the upper edge or lower edge of the opening of the recess 24, or the like.

[0045] (Method of determining deterioration of tool 100) Next, a method for determining deterioration of the tool 100 will be described. The deterioration of the tool 100 means that the clamping surfaces 124a, 124b of the tip portion 122 of the tool 100 wear due to rubbing against the retaining ring 200, and the clamping force of the retaining ring 200 by the tip portion 122 weakens. When the holding force of the retaining ring 200 by the tip portion 122 weakens, the retaining ring 200 becomes more likely to come off from the tip portion 122 of the tool 100. When the retaining ring 200 comes off from the tip portion 122 of the tool 100, the elastic deformation in the width direction of the extension portion 120 is released, and the retaining ring 200 is likely to fly off. Generally, a worker holds the grip portion 110 of the tool 100 by hand when using the tool, so that the flying retaining ring 200 can become a safety hazard, such as getting into the worker's eyes.

[0046] First, as shown in Figures 1 and 2(A)(B), the outer peripheral surface 200a of the retaining ring 200 is clamped between the clamping surfaces 124a, 124b of the tip portion 122 of the tool 100, and the lower surface 200c of the retaining ring 200 is supported by the support surfaces 126a, 126b of the tip portion 122 (first step).

[0047] Next, as shown in Figures 6 and 7, the upper surface 200d of the retaining ring 200 held by the tool 100 is turned up, and the tip portion 122 is brought into contact with the guide surface portion 48 of the forming portion 40. Furthermore, as shown in Figures 7 and 8, the tip portion 122 is slid along the guide surface portion 48, and the portion of the retaining ring 200 protruding from the tip portion 122 is inserted into the recess 24. Then, the retaining ring 200 is abutted against the bottom of the recess 24 (second step). In this state, the tip portion 122 of the tool 100 and the weight 20 are separated from each other.

[0048] Next, as shown in Figures 9(A) and 9(B), the tool 100 is raised (third step). When the weight 20 rises together with the tool 100 as shown in Figure 9(A), it is determined that the tool 100 is not deteriorated, and when the weight 20 does not rise as shown in Figure 9(B), it is determined that the tool 100 is deteriorated. In other words, when the retaining ring 200 comes off the tip portion 122, it is determined that the tool 100 is deteriorated.

[0049] (summary) As described above, in the method for determining deterioration of the jig 10 and the tool 100, when an undeteriorated tool 100 is raised with the retaining ring 200 inserted in the recess 24, the weight 20 rises together with the tool 100. On the other hand, when a deteriorated tool 100 is raised, the retaining ring 200 comes off the tool 100. In this manner, deterioration of the tool 100 is determined.

[0050] Furthermore, in the jig 10, when the portion of the retaining ring 200 protruding from the tip 122 is inserted into the recess 24 and the retaining ring 200 is abutted against the bottom of the recess 24, the tip 122 of the tool 100 and the weight 20 are separated. Therefore, compared to the case where the tip of the tool and the weight are in contact with each other with the retaining ring abutted against the bottom of the recess, the tip of the tool no longer supports the weight, so deterioration of the tool 100 can be effectively determined (the occurrence of erroneous determination of deterioration is suppressed).

[0051] In the jig 10, a male thread is formed on the outer circumferential surface of the protruding portion 26 of the main body 22, and the nut 30 is screwed into the protruding portion 26. This allows the weight of the weight 20 to be adjusted by replacing or adding the nut 30.

[0052] In the jig 10, a male thread is formed on the outer peripheral surface of the protruding portion 26 of the main body portion 22, and the nut 30 is screwed onto the protruding portion 26. This makes the position of the nut 30 relative to the main body portion 22 more stable than when a gap is provided between the inner peripheral surface of the nut and the outer peripheral surface of the protruding portion.

[0053] <Second embodiment> An example of a jig and a degradation determination method according to a second embodiment of the present disclosure will be described with reference to Fig. 10. Note that, regarding the second embodiment, differences from the first embodiment will be mainly described.

[0054] 10, the weight 320 of the jig 310 according to the second embodiment includes a main body 322 and a bolt 330. A hole 324 having an upwardly opening and a circular cross section is formed in the top surface 22e of the main body 322, and a female thread is formed on the inner peripheral surface of the hole 324.

[0055] Furthermore, a male thread is formed on a cylindrical portion 330a of the bolt 330, and the bolt 330 is screwed into the hole portion 324. The bolt 330 is an example of an insertion portion.

[0056] In the jig 310 described above, a female thread is formed on the inner circumferential surface of the hole 324 of the main body 322, and the bolt 330 is screwed into the hole 324. Thus, by replacing the bolt 330, the weight of the weight 320 can be adjusted.

[0057] In jig 310, a female thread is formed on the inner circumferential surface of hole 324 of body 322, and bolt 330 is screwed into hole 324. This makes the position of bolt 330 relative to body 322 more stable than when a gap is provided between the inner circumferential surface of the hole and the outer circumferential surface of the bolt.

[0058] Although the present disclosure has been described in detail with respect to a specific embodiment, it is clear to those skilled in the art that the present disclosure is not limited to the embodiment, and various other embodiments are possible within the scope of the present disclosure. For example, in the first and second embodiments, when the retaining ring 200 is abutted against the bottom of the recess 24, the tip 122 of the tool 100 and the weight 20 are separated from each other, but they may come into contact with each other. In this case, however, the effect of separation is not achieved.

[0059] In the above embodiment, an E-ring is used as an example of a retaining ring, but a C-ring or the like may also be used.

[0060] In the first embodiment, the nut 30 is screwed into the protruding portion 26 having a male thread, but a member having a through hole with a circular cross section may be inserted into the cylindrical protruding portion. In this case, however, the effect of screwing the nut 30 into the protruding portion 26 having a male thread is not achieved.

[0061] In the second embodiment, a female thread is formed on the inner circumferential surface of hole 324 of body 322, and bolt 330 is screwed into hole 324, but a cylindrical portion having a circular cross section may be inserted into a hole having a circular cross section. In this case, however, the effect of bolt 330 being screwed into hole 324 will not be achieved.

[0062] (((1))) a recess is formed in the tool so that the other part of the retaining ring, the other part of which has a peripheral surface clamped by the tip part of the tool and one surface of the portion supported by the tip part, is inserted with the other surface of the portion facing up, and a weight is raised together with the retaining ring when the tool that is not deteriorated is raised in a state where the other part is inserted in the recess; a positioning portion for positioning the weight and a forming portion having a guide surface portion for guiding the other portion into the recess by sliding the tip portion; A jig having the above structure.

[0063] (((2))) The tip portion and the weight are spaced apart from each other in a state where the other portion is inserted into the recess and abuts against a bottom of the recess. The jig described in (((1))).

[0064] (((3))) The weight includes a main body portion in which the recess is formed and a protruding portion having a circular cross section protruding upward is formed, and an insertion portion in which a through hole into which the protruding portion is inserted is formed. The jig described in (((1))) or (((2))).

[0065] (((4))) A male screw is formed on the outer circumferential surface of the protrusion, A female thread is formed on an inner peripheral surface of the through hole of the insertion portion, the female thread being engaged with a male thread formed on the protruding portion. The jig described in (((3))).

[0066] (((5))) The weight includes a main body portion in which the recess is formed and in which a hole portion having a circular cross section and opening upward is formed, and an insertion portion in which a cylindrical portion to be inserted into the hole portion is formed. The jig described in (((1))) or (((2))).

[0067] (((6))) A female thread is formed on the inner circumferential surface of the hole, A male thread is formed on the outer circumferential surface of the cylindrical portion of the insertion portion, the male thread being engaged with the female thread formed in the hole portion. (((5)))

[0068] (((7))) a first step of clamping a peripheral surface of a portion of the retaining ring with a tip end of a tool and supporting one surface of the peripheral surface with the tip end; a second step of inserting the other part of the retaining ring protruding from the tip end into a recess formed in the weight with the other surface of the part facing up; a third step of raising the tool and determining that the retaining ring is deteriorated if the retaining ring comes off the tip portion; The deterioration determination method includes the steps of:

[0069] According to the jig of (((1))), deterioration of the tool can be determined.

[0070] The jig of (((2))) makes it possible to effectively determine deterioration of the tool compared to a case in which the tip of the tool is in contact with the weight with the other part of the retaining ring abutting against the bottom of the recess.

[0071] According to the jig of (((3))), the weight of the weight can be adjusted by replacing the insertion part.

[0072] According to the jig of (((4))), the posture of the insertion portion relative to the main body can be stabilized compared to a case where a gap is provided between the outer peripheral surface of the protrusion and the inner peripheral surface of the through hole of the insertion portion.

[0073] According to the jig of (((5))), the weight of the weight can be adjusted by replacing the insertion part.

[0074] The jig according to (((6))) makes it possible to stabilize the posture of the insertion portion relative to the main body portion, compared to a case in which a gap is provided between the inner surface of the hole portion and the outer surface of the cylindrical portion.

[0075] According to the deterioration determination method of (((7))), deterioration of a tool can be determined. [Explanation of symbols]

[0076] 10 Jig 20 weights 22 Main body 24 Recess 26 Protrusion 30 Nut (an example of an insertion part) 30a through hole 40 Formation part 44 Positioning recess (an example of a positioning portion) 48 Guide surface section 100 Retaining ring attachment tool (example of tool) 122 Tip 200 retaining ring 200a Outer circumferential surface (an example of the outer circumferential surface) 200c Bottom surface (example of one surface) 200d Top surface (an example of the other surface) 310 Jig 320 Weight 322 Main body 324 Hole 330 Volts (Example of Insertion Part) 330a Cylinder section

Claims

1. a recess is formed in the tool so that the other part of the retaining ring, the other part of which has a peripheral surface clamped by the tip part of the tool and one surface of the portion supported by the tip part, is inserted with the other surface of the portion facing up, and a weight is raised together with the retaining ring when the tool that is not deteriorated is raised in a state where the other part is inserted in the recess; a positioning portion for positioning the weight and a forming portion having a guide surface portion for guiding the other portion into the recess by sliding the tip portion; A jig having the above structure.

2. The tip portion and the weight are spaced apart from each other in a state where the other portion is inserted into the recess and abuts against a bottom of the recess. The jig according to claim 1 .

3. The weight includes a main body portion in which the recess is formed and a protruding portion having a circular cross section protruding upward is formed, and an insertion portion in which a through hole into which the protruding portion is inserted is formed. The jig according to claim 1 .

4. A male screw is formed on the outer circumferential surface of the protrusion, A female thread is formed on an inner peripheral surface of the through hole of the insertion portion, the female thread being engaged with a male thread formed on the protruding portion. The jig according to claim 3.

5. The weight includes a main body portion in which the recess is formed and in which a hole portion having a circular cross section and opening upward is formed, and an insertion portion in which a cylindrical portion to be inserted into the hole portion is formed. The jig according to claim 1 .

6. A female thread is formed on the inner circumferential surface of the hole, A male thread is formed on the outer circumferential surface of the cylindrical portion of the insertion portion, the male thread being engaged with the female thread formed in the hole portion. The jig according to claim 5

7. a first step of clamping a peripheral surface of a portion of the retaining ring with a tip end of a tool and supporting one surface of the peripheral surface with the tip end; a second step of inserting the other part of the retaining ring protruding from the tip end into a recess formed in the weight with the other surface of the part facing up; a third step of raising the tool and determining that the retaining ring is deteriorated if the retaining ring comes off the tip portion; The deterioration determination method includes the steps of:

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