JP6409689B2 - Caulking process inspection method - Google Patents

Description

  The present invention relates to a caulking processing inspection method, and more particularly to an inspection method in a case where a caulking joint cannot be visually recognized from the outside.

  As a method of joining two members, by fitting the coupling member to the outer peripheral surface of the coupled member, pressing the caulking tool to one end surface of the coupling member, and plastically deforming the inner part of the coupling member toward the coupled member side Caulking that joins a member to be joined and a joining member is known.

  For example, FIG. 7 of Patent Document 1 discloses a dynamic vibration absorber formed by caulking. As shown in FIG. 8, the dynamic vibration absorber 100 is disposed inside a piston pin 103 that connects a piston 101 and a connecting rod 102 in order to suppress noise of an engine mounted on a vehicle such as an automobile. A fixed portion 110 fixed inside the piston pin 103 and a movable portion 120 supported by the fixed portion 110 so as to be swingable. The movable portion 120 has an outer periphery of a shaft portion 111 extending from the fixed portion 110. It is formed by caulking a cylindrical mass adjusting portion 112 on the surface.

  Specifically, as shown in FIG. 9, the movable portion 120 is configured such that the cylindrical mass adjusting portion 112 is fitted to the shaft portion 111 in which the caulking groove 111 a is formed on the outer peripheral surface. By pressing a caulking tool on one end surface to form the pressing hole portion 112a, the inner portion of the pressing hole portion 112a in the mass adjusting portion 112 is caused to fall into the groove portion 111a of the shaft portion 111 to the shaft portion 111. The mass adjusting portion 112 is formed by caulking.

  In the dynamic vibration absorber 100 configured as described above, if the load applied to the mass adjustment unit 112 by the caulking tool when the mass adjustment unit 112 is caulked with respect to the shaft portion 111, the dynamic vibration absorber 100 is excessively large. In particular, the deformation of the small-diameter portion between the fixed portion 110 and the movable portion 120 can be caused, so that the load applied to the mass adjusting portion 112 during caulking is limited.

  Further, in the dynamic vibration absorber 100, when the caulking process of the mass adjusting unit 112 with respect to the shaft part 111 is insufficient when the mass adjusting unit 112 is caulked with respect to the shaft part 111, the mass adjusting part is changed from the shaft part 111. Since there is a possibility that 112 may come off, it is required to accurately inspect the caulking state of the caulking process in which the mass adjusting unit 112 is caulked with respect to the shaft 111.

  On the other hand, as a method for inspecting the caulking state, for example, in Patent Document 2, the coupling member is fitted inside the coupled member so that the cylindrical tip protrudes a predetermined amount from the end surface of the coupled member. After that, when the cylindrical tip portion is pressed by a caulking tool for caulking, a caulking state is inspected by comparing the displacement speed of the caulking tool with a preset displacement speed.

Japanese Patent Laying-Open No. 2015-83826 JP 2007-31865 A

  However, as described in Patent Document 2, when the caulking state is inspected from the displacement speed of the caulking tool, for example, when the tip portion of the caulking tool is worn, the displacement speed of the caulking tool is set to a preset displacement speed. Even if it is within the allowable range, there is a possibility that it is not actually caulked properly.

  On the other hand, as described in Patent Document 2, for example, when the caulking coupling portion where the coupled member and the coupling member are coupled by caulking can be visually recognized from the outside, for example, the caulking coupling portion is imaged. Thus, it is considered that the caulking state of the coupling member with respect to the coupled member can be detected with high accuracy.

  However, as in the case of the dynamic vibration absorber described in FIG. 7 of Patent Document 1, if the caulking coupling portion where the coupled member and the coupling member are coupled by caulking cannot be visually recognized from the outside, how The problem is whether to check the caulking state of the coupling member with respect to the coupled member. When the accuracy of the caulking state is required as in the dynamic vibration absorber described in Patent Document 1, it is desired to accurately inspect the caulking state of the coupling member with respect to the coupled member.

  Accordingly, an object of the present invention is to provide a caulking processing inspection method capable of accurately inspecting the caulking state of the coupling member even when the caulking coupling portion cannot be visually recognized from the outside.

  In order to solve the above problems, the present invention is configured as follows.

First, the invention according to claim 1 of the present application provides a coupling member formed in a cylindrical shape with respect to a coupled member in which a caulking groove is formed on the outer peripheral surface of the coupled member formed in a shaft shape. Fitting is performed so as to face the groove portion of the member to be coupled, and a caulking tool is pressed against one end surface of the coupling member to form a pressing hole portion, thereby forming an inner portion of the pressing hole portion in the coupling member as the groove portion. An inspection method for caulking, in which the coupling member is crimped to the coupled member by being collapsed into the coupling member, wherein a pressing hole is formed in advance for a plurality of coupling members for preliminary measurement, and the pressing hole A pre-measuring step for measuring the depth of the inner portion and the amount of collapse of the inner portion thereof to obtain a relationship between the two, a pressing hole forming step for forming a pressing hole in the coupling member to be inspected, and the pressing hole forming step press that in the formation A pressing hole depth measurement step of measuring the depth of the hole, the depth of the pressing hole measured at the pressing hole depth measurement step, based on the relationship and acquired in preliminary measurement step, A collapse amount estimation step for estimating a collapse amount of an inner portion of the pressing hole in the coupling member to be inspected, and a caulking state of the coupling member to be inspected is determined based on the collapse amount estimated in the collapse amount estimation step. And a caulking state determination step.

The invention according to claim 2 is the caulking processing inspection method according to claim 1, wherein the preliminary measurement step does not include a tip portion where a groove portion is formed as the member to be coupled. A pressing hole is formed in one end face of the connecting member for pre-measurement fitted to the member to be used, and the depth of the pressing hole and the amount of collapse of the inner portion are measured .

The invention according to claim 3 is the caulking processing inspection method according to claim 1 or 2, wherein the caulking state determination step is a combination of the inspection objects estimated in the collapse amount estimation step. Determining that the caulking state is normal when the amount of collapse of the member is within a predetermined range, and determining that the caulking state is abnormal when the amount of collapse of the coupling member to be inspected is larger or smaller than the predetermined range. Features.

According to a fourth aspect of the present invention, in the caulking processing inspection method according to the third aspect, in the caulking state determination step, the amount of collapse of the inspected coupling member is smaller than a predetermined range and the caulking state is abnormal. When it is determined that there is a pressing hole, the crimping tool is pressed to a position different from the pressing hole on one end surface of the coupling member to be inspected to form another pressing hole different from the pressing hole. the other after re caulking coupling member of the test object relative to the target binding member an inner portion of the pressing hole was further tilt down into said groove, coupling members of said object with respect to the target binding member by of comprising a reinspection step of retesting the crimping state, the retest step, the other pressing hole shape was measured and the test pair on the basis of the measured shape of the other pressing bore portions Of determining the caulking state of the coupling member, characterized in that.

  With the above configuration, according to the first aspect of the present invention, the cylindrical coupling member is covered with the coupling member in which the caulking groove is formed on the outer peripheral surface of the shaft-shaped coupling member. Fitting so as to face the groove of the coupling member, and forming a pressing hole on one end face of the coupling member, the inner part of the pressing hole in the coupling member is collapsed into the groove and coupled to the member to be coupled After caulking the member, the shape of the pressing hole is measured, and the caulking state of the coupling member is determined based on the measured shape of the pressing hole.

As a result, even when the caulking coupling portion cannot be visually recognized from the outside, the caulking state of the coupling member can be determined by measuring the shape of the pressing hole formed on one end surface of the coupling member having a correlation with the caulking state of the coupling member. Inspection can be performed with high accuracy. Even when the caulking tool is worn, the caulking state of the coupling member can be accurately inspected by measuring the shape of the pressing hole formed on one end surface of the coupling member. Even when the load applied to the coupling member when the coupling member is pressed by the caulking tool is limited to a predetermined value or less, the caulking state of the coupling member can be accurately inspected.
Further, the caulking state of the coupling member is determined by measuring the depth of the pressing hole portion formed on the one end surface of the coupling member and determining the caulking state of the coupling member based on the measured depth of the pressing hole portion. By measuring the depth of the pressing hole formed on one end surface of the coupling member having a correlation, the caulking state of the coupling member can be inspected with high accuracy relatively easily.

According to the second aspect of the present invention, since the pre-measurement step uses a member that does not have a tip portion on which the groove is formed as the member to be coupled , the pre-measuring member fitted to the member to be coupled is used. A pressing hole is formed on one end face of the coupling member, and the depth of the pressing hole and the amount of collapse of the inner part can be measured.

  According to the invention described in claim 3, the amount of collapse of the coupling member is estimated based on the shape of the pressing hole portion formed on one end surface of the coupling member, and the estimated amount of collapse of the coupling member is within a predetermined range. One end surface of the coupling member by determining that the caulking state of the coupling member is normal, and determining that the caulking state of the coupling member is abnormal when the amount of collapse of the coupling member is larger or smaller than a predetermined range. The normality and abnormality of the caulking state of the coupling member can be determined using the amount of collapse of the coupling member estimated based on the shape of the pressing hole formed in the.

  According to the invention of claim 4, when the amount of collapse of the coupling member is smaller than the predetermined range and the caulking state of the coupling member is determined to be abnormal, the caulking tool is pressed against one end surface of the coupling member. After forming the other pressing hole portion again, the connecting member is caulked again with respect to the member to be connected, and then the shape of the other pressing hole portion is measured, and the measured shape of the other pressing hole portion is used. The caulking state of the coupling member is determined.

  As a result, when it is determined that the caulking state of the coupling member is smaller than the predetermined range and the caulking state is abnormal, another pressing hole portion is formed on one end face of the coupling member and caulking is performed again, and then the coupling member is caulked. The state can be inspected again, and the caulking state of the coupling member can be accurately detected.

It is a figure which shows the piston structure which has a piston pin with which the dynamic vibration absorber which the crimping process which concerns on embodiment of this invention was performed was arrange | positioned. It is sectional drawing of the piston structure along the Y2-Y2 line in FIG. It is a figure which shows the press apparatus used when arrange | positioning a dynamic vibration absorber to a piston pin. It is a figure which shows the arrangement | positioning process of the dynamic vibration damper to a piston pin. It is explanatory drawing for demonstrating the crimping process given to a dynamic vibration damper. It is a figure which expands and shows the caulking process part of a dynamic vibration absorber. It is a graph which shows the relationship between the depth of a press hole part, and the amount of collapse. It is a figure which shows the piston structure which has the piston pin by which the dynamic vibration damper was arrange | positioned. It is a figure which expands and shows the principal part of the piston structure in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a view showing a piston structure having a piston pin on which a dynamic vibration absorber to which caulking is applied according to an embodiment of the present invention is provided, and FIG. 2 is taken along line Y2-Y2 in FIG. FIG.

  A piston 1 shown in FIGS. 1 and 2 is reciprocally disposed in a cylinder of an engine cylinder block mounted on a vehicle such as an automobile, and forms a part of an engine combustion chamber and has an outer periphery. A head portion 1a having a piston ring 2 fitted on the surface; a skirt portion 1b extending downward from the outer periphery of the head portion 1a; and a boss portion 1c provided to project from the inner surface of the skirt portion 1b. doing.

  In the piston 1, through holes 1d for supporting the piston pin 3 are formed in two boss portions 1c provided to face the inner surface of the skirt portion 1b, and the piston pin 3 snaps to the through hole 1d. The ring 4 is rotatably supported while being prevented from coming off in the axial direction.

  The piston pin 3 is also inserted into a small diameter hole portion 5b formed in the small end portion 5a of the connecting rod 5 disposed between the two boss portions 1c of the piston 1, and is rotatably connected to the connecting rod 5. The connecting rod 5 is also inserted into a large-diameter hole portion 5d formed in the large end portion 5c of the connecting rod 5 so that the crankshaft is rotatably connected to the crankshaft.

  Lubricating oil is supplied between the piston pin 3 and the through-hole portion 1d of the piston 1 to form a lubricating oil film, so that the piston pin 3 can smoothly rotate with respect to the through-hole portion 1d of the piston 1. Yes. Further, lubricating oil is also supplied between the piston pin 3 and the small diameter hole portion 5 b of the connecting rod 5 to form a lubricating oil film so that the piston pin 3 can smoothly rotate with respect to the small diameter hole portion 5 b of the connecting rod 5. It has become.

  In the piston structure including the piston 1, the piston pin 3 and the connecting rod 5 configured as described above, the piston 1 repeats reciprocating motion in the cylinder central axis direction within the cylinder of the cylinder block, and the reciprocating motion of the piston 1 is performed. It is converted into a rotational motion of the crankshaft via the connecting rod 5.

  In the piston structure, the piston 1, the piston pin 3, and the small end portion 5a of the connecting rod 5 correspond to the mass portion as a whole, and the connecting portion 5e that connects the small end portion 5a and the large end portion 5c of the connecting rod 5 is the spring portion. The piston 1, the piston pin 3, and the small end portion 5a of the connecting rod 5 may vibrate at a predetermined resonance frequency as a whole with respect to the large end portion 5c of the connecting rod 5 to cause engine noise.

  On the other hand, in the piston structure, the caulking process according to the embodiment of the present invention is applied to the inside of the cylindrically formed piston pin 3 that connects the piston 1 and the connecting rod 5 in order to suppress engine noise. A dynamic vibration absorber 10 is attached.

  The dynamic vibration absorber 10 has a resonance frequency set so that the piston 1, the piston pin 3, and the small end portion 5a of the connecting rod 5 substantially resonate with the large end portion 5c of the connecting rod 5 as a whole. 5 is configured to reduce vibration caused by expansion and contraction of the engine 5 and suppress engine noise.

  In the dynamic vibration absorber 10, the piston 1, the piston pin 3, and the small end portion 5 a of the connecting rod 5 are integrated as a result of the absence of the lubricating oil film formed between the piston pin 3 and the connecting rod 5 in the combustion stroke of the engine. Resonance with respect to the large end portion 5c of the connecting rod 5 is suppressed, and in the intake stroke, compression stroke, and exhaust stroke of the engine, the dynamic vibration absorber 10 is formed by a lubricating oil film formed between the piston pin 3 and the connecting rod 5. Vibration is not transmitted to the connecting rod 5.

  As shown in FIG. 2, the piston pin 3 is formed such that the axial center portion 3 a on the inner peripheral surface of the piston pin 3 has a smaller inner diameter than the end portions 3 b on both sides, and the center on the inner peripheral surface of the piston pin 3. The dynamic vibration absorber 10 is coupled to the portion 3a by press-fitting.

  The dynamic vibration absorber 10 is fixed to a central portion 3a on the inner peripheral surface of the piston pin 3, and is supported by the fixed portion 10a so as to be swingable in the radial direction of the piston pin 3 so that the axial direction of the piston pin 3 And a support portion 10c for supporting the movable portion 10b on the fixed portion 10a so as to be swingable in the radial direction of the piston pin 3. In the dynamic vibration absorber 10, the movable part 10b is supported via the support part 10c on the axial direction both sides of the piston pin 3 with respect to the fixed part 10a.

  The fixed portion 10a, the movable portion 10b, and the support portion 10c are each formed in a columnar shape. The fixed portion 10 a is formed so that the outer diameter of the fixed portion 10 a is substantially equal to the inner diameter of the central portion 3 a on the inner peripheral surface of the piston pin 3, and is fixed to the central portion 3 a on the inner peripheral surface of the piston pin 3 by press-fitting.

  The movable portion 10b is disposed with a predetermined gap inside the piston pin 3 so as to be able to swing in the radial direction of the piston pin 3 with respect to the fixed portion 10a, and so as to protrude from the piston pin 3. Is provided.

  The support portion 10c is provided on both sides of the fixed portion 10a, and the outer diameter of the support portion 10c is smaller than the outer diameter of the fixed portion 10a and the movable portion 10b. The support portion 10 c is also formed shorter than the movable portion 10 b in the axial direction of the piston pin 3.

  In the present embodiment, the dynamic vibration absorber 10 includes a shaft-shaped member 11 as a coupled member formed in a shaft shape and a cylindrical member 12 as a coupling member formed in a tubular shape, and includes a fixed portion 10a. The support portions 10c on both sides of the fixed portion 10a and the movable portion 10b on the one side in the axial direction of the piston pin 3 (the movable portion 10b on the left side in FIG. 2) are formed by the shaft-shaped member 11, and the other side in the axial direction of the piston pin 3 The movable portion 10 b (the movable portion 10 b on the right side in FIG. 2) is formed by the shaft-shaped member 11 and the cylindrical member 12.

  The movable portion 10b on the other side in the axial direction of the piston pin 3 in the dynamic vibration absorber 10 is spaced from the one end surface of the shaft-like member 11 on the outer peripheral surface of the shaft-like member 11 as shown in FIG. And the cylindrical member 12 is fitted to the shaft member 11 such that one end surface of the cylindrical member 12 faces the groove portion 11a of the shaft member 11. By pressing the caulking tool 45 on one end surface to form the pressing hole portion 12a, the inner portion 12b of the pressing hole portion 12a in the cylindrical member 12 is caused to fall into the groove portion 11a so as to be cylindrical with respect to the shaft-shaped member 11. The member 12 is formed by caulking.

  The shaft-like member 11 has a base portion 11b on the fixed portion side and a tip portion 11c on the anti-fixed portion side at a portion constituting the movable portion 10b on the other axial side of the piston pin 3, and the tip portion 11c is a base portion 11b. The outer diameter is made smaller than that, and a step portion 11d is formed between the base portion 11b and the tip portion 11c.

  On the other hand, the cylindrical member 12 has a first portion 12c fitted to the base portion 11b of the shaft-shaped member 11, and a second portion 12d fitted to the tip portion 11c of the shaft-shaped member 11, and the first portion 12c is The inner diameter is larger than that of the second portion 12d, and a step portion 12e is formed between the first portion 12c and the second portion 12d. The first portion 12c of the cylindrical member 12 is also formed so that the inner diameter thereof is substantially equal to the outer diameter of the base portion 11b of the shaft-shaped member 11, and is press-fitted into the base portion 11b of the shaft-shaped member 11.

  When the tubular member 12 is fitted to the shaft-like member 11 so that the stepped portion 12e of the tubular member 12 engages with the stepped portion 11d of the shaft-like member 11, the tubular member 12 becomes a groove portion of the shaft-like member 11. Specifically, one end surface of the cylindrical member 12 is formed so as to be opposed to the groove portion 11a of the shaft-like member 11 so as to face 11a.

  Then, by pressing the caulking tool 45 on one end surface of the cylindrical member 12 to form the pressing hole portion 12 a, the inner portion 12 b of the pressing hole portion 12 a in the cylindrical member 12 is placed in the groove portion 11 a of the shaft-shaped member 11. The cylindrical member 12 is caulked with respect to the shaft-like member 11 so as to fall down.

  As described above, the movable portion 10b is provided so as to protrude from the piston pin 3, and the end surface of the cylindrical member 12 forming the movable portion 10b is provided so as to protrude from the piston pin 3. The end surface of the cylindrical member 11 is provided so as to protrude from the end surface of the cylindrical member 12.

Next, a method of disposing the dynamic vibration absorber 10 thus configured on the piston pin 3 will be described.
FIG. 3 is a diagram illustrating a press device used when a dynamic vibration absorber is disposed on a piston pin. 3 press-fits the shaft-shaped member 11 into the piston pin 3, press-fits the tubular member 12 into the shaft-shaped member 11, and caulks the tubular member 12 to the shaft-shaped member 11. It is configured.

  The press device 20 is disposed inside a first guide member 22 and a second guide member 23 that are fixed to the outer peripheral portion of the die plate 21, and a piston pin support member 24 that supports the piston pin 3, and a piston pin support member 24. A spring 25 that urges the piston plate upward, a pin member 26 that is fixed to the center portion of the die plate 21 and supports the shaft-like member 11, and a piston pin support member 24 when the piston pin support member 24 is moved downward. A stopper member 27 for receiving the member 24 is provided.

  The pressing device 20 also includes a punch plate 31 configured to be movable in the vertical direction with respect to the die plate 21, and a punch tool 35 attached to the punch plate 31. In the press device 20, the movement of the punch plate 31 is controlled by a control unit (not shown).

  FIG. 4 is a diagram illustrating a process of disposing the dynamic vibration absorber on the piston pin. When the dynamic vibration absorber 10 is disposed on the piston pin 3, first, the piston pin 3, the shaft-like member 11 and the cylindrical member 12 each having a predetermined shape are prepared. As shown in FIG. The shaft member 11 is inserted into the insertion hole 24a provided in the center of the support member 24 to support the shaft member 11 on the pin member 26, and then the piston pin 3 is fitted to the shaft member 11 and the piston is fitted. A piston pin support portion 24b provided on the upper surface of the pin support member 24 is supported.

  Then, as shown in FIG. 4A, the punch plate 31 is lowered and the piston pin 3 is pressed downward by the lower surface of the punch tool 35. When the piston pin 3 is pressed downward until the piston pin support member 24 contacts the stopper member 27, the piston pin 3 is moved downward relative to the shaft-like member 11 supported by the pin member 26, and the piston pin 3 and the shaft The member 11 is joined by press-fitting at a predetermined position.

  The punch tool 35 is formed with a through hole 35a having an inner diameter larger than the outer diameter of the tip portion 11c of the shaft member 11 and smaller than the outer diameter of the second portion 12d of the tubular member 12. The piston pin 3 is formed to be pressed downward without pressing the shaft-like member 11 downward.

  After the piston pin 3 and the shaft-shaped member 11 are coupled by press-fitting, as shown in FIG. 4B, the punch plate 31 is raised and the piston pin 3 supported by the piston pin support member 24 is moved upward. At the same time, the shaft-like member 11 coupled to the piston pin 3 is also moved upward. Then, the cylindrical member 12 is fitted to the shaft-shaped member 11.

  Next, as shown in FIG. 4C, the punch plate 31 is lowered and the tubular member 12 protruding from the piston pin 3 is pressed downward by the lower surface of the punch tool 35. When the cylindrical member 12 is pressed downward, the first portion 12c of the cylindrical member 12 is press-fitted into the base portion 11b of the shaft-shaped member 11, and the step portion 12e of the cylindrical member 12 and the step portion 11d of the shaft-shaped member 11 are pressed. And the tubular member 12 is fitted to the shaft-like member 11 so as to face the groove 11a of the shaft-like member 11. Note that the punch tool 35 moves downward so that the shaft member 11 does not move relative to the piston pin 3 when the tube member 12 is pressed downward to fit the tube member 12 to the shaft member 11. Is done.

  Thus, after the piston pin 3 and the shaft-shaped member 11 are coupled by press-fitting and the cylindrical member 12 is fitted to the shaft-shaped member 11, a caulking tool 45 is attached to the punch plate 31 instead of the punch tool 35. As shown in FIG. 4D, the punch plate 31 is lowered and the caulking tool 45 is pressed against one end surface of the cylindrical member 12 to couple the shaft member 11 and the cylindrical member 12 by caulking. .

  FIG. 5 is an explanatory diagram for explaining the caulking process applied to the dynamic vibration absorber, and shows an enlarged part of the press device 20 shown in FIG. As shown in FIG. 5, the caulking tool 45 attached to the punch plate 31 includes two projecting portions 45 a projecting downward in a triangular cross section at the lower end portion, and the two projecting portions 45 a are opposed to each other. Is arranged.

  Each of the protrusions 45a of the caulking tool 45 has a predetermined length in the circumferential direction of the caulking tool 45, for example, has a predetermined length in the circumferential direction with a central angle of 30 degrees, and is formed in an arc shape. The shape of the protrusion 45a is not limited to this, and other various shapes such as a conical shape can be used.

  The caulking tool 45 is also formed with a through hole 45b having an inner diameter that is larger than the outer diameter of the distal end portion 11c of the shaft member 11 and smaller than the outer diameter of the second portion 12d of the cylindrical member 12. Is formed so as to press the cylindrical member 12 without pressing the shaft-shaped member 11.

  As shown in FIG. 5, the caulking tool 45 is moved downward by lowering the punch plate 31 in a state where the tubular member 12 is fitted to the shaft member 11 so as to face the groove 11 a of the shaft member 11. When it is moved and pressed against one end surface of the cylindrical member 12, a pressing hole portion 12 a is formed on the one end surface of the cylindrical member 12 by the projection 45 a of the caulking tool 45. Along with this, a pressing hole in the cylindrical member 12 is formed. The inner portion 12 b of the portion 12 a falls into the groove 11 a of the shaft member 11, and the cylindrical member 12 is caulked with respect to the shaft member 11.

  FIG. 6 is an enlarged view of the caulking coupling portion of the dynamic vibration absorber. As shown in FIGS. 4 (d) and 5, after the caulking tool 45 is pressed against one end surface of the tubular member 12 and the tubular member 12 is caulked with respect to the shaft member 11, the punch plate 31 is raised. Then, as shown in FIG. 6, the shaft-shaped member 11 and the tubular member 12 are coupled by the inner portion 12 b of the pressing hole portion 12 a in the tubular member 12 that falls into the groove portion 11 a of the shaft-shaped member 11. A caulking joint 13 is formed.

  In the dynamic vibration absorber 10, the first portion 12 c of the tubular member 12 is press-fitted into the base portion 11 b of the shaft-shaped member 11, and the tubular member 12 is fitted to the shaft-shaped member 11. The cylindrical member 12 is assembled to the shaft-like member 11 by caulking the cylindrical member 12, and the cylindrical member 12 is prevented from coming off the shaft-like member 11.

  When the caulking tool 45 is pressed against the one end surface of the cylindrical member 12, the load applied to the cylindrical member 12 by the caulking tool 45 suppresses deformation of the dynamic vibration absorber 10, particularly deformation of the support portion 10c. It is set below a predetermined value. Further, when the cylindrical member 12 is pressed downward by the punch tool 35 and the first portion 12 c of the cylindrical member 12 is press-fitted into the base portion 11 b of the shaft-shaped member 11, the punch tool 35 is applied to the cylindrical member 12. The load is set to a predetermined value or less so as to suppress deformation of the dynamic vibration absorber 10, particularly deformation of the support portion 10 c.

  Then, by pressing the caulking tool 45 on one end surface of the cylindrical member 12 to form the pressing hole portion 12a, the inner portion 12b of the pressing hole portion 12a in the cylindrical member 12 falls into the groove portion 11a of the shaft member 11. After the cylindrical member 12 is caulked with respect to the shaft-shaped member 11, the caulking process is inspected.

  In the dynamic vibration absorber 10 subjected to caulking according to the present embodiment, the caulking coupling portion 13 where the shaft-shaped member 11 and the cylindrical member 12 are coupled by caulking is provided in the groove portion 11 a of the shaft-shaped member 11. Since it is not visible from the outside, the shape of the pressing hole portion 12a formed on one end surface of the cylindrical member 12 is measured, and the cylindrical member with respect to the shaft member 11 is measured based on the measured shape of the pressing hole portion 12a. Twelve caulking states are determined.

  Prior to the caulking inspection, first, for the plurality of cylindrical members 12, by pressing the caulking tool 45 on one end face of the cylindrical member 12 to form the pressing hole portion 12a, the pressing hole portion in the cylindrical member 12 is formed. The inner portion 12b of 12a is tilted inward, and the depth D of the pressing hole portion 12a shown in FIG. 6 and the amount of collapse W of the inner portion of the pressing hole portion 12a in the cylindrical member 12 are measured, and the pressing hole The relationship between the depth of the part and the amount of collapse was investigated.

  When investigating the relationship between the depth of the pressing hole and the amount of collapse, the shaft-like member 11 not provided with the tip 11c is used, and after the shaft-like member 11 is press-fitted into the piston pin 3, the shaft-like member 11 is tubed. After fitting the cylindrical member 12 and then pressing the caulking tool 45 on one end surface of the cylindrical member 12 to form the pressing hole portion 12a, the depth D of the pressing hole portion 12a and the pressing in the cylindrical member 12 The amount of collapse W of the inner part of the hole 12a was measured.

  FIG. 7 is a graph showing the relationship between the depth of the pressing hole and the amount of collapse. In FIG. 7, the depth D of the pressing hole 12a is taken on the horizontal axis, and the amount of fall W is plotted on the vertical axis. In FIG. 7, the measurement results of the depth D of the pressing hole 12a and the amount of collapse W are represented as black squares.

  Then, from the measurement results shown in FIG. 7, an approximate expression of a linear function representing the relationship between the depth of the pressing hole and the amount of collapse is calculated by a known least square method, and the relationship between the depth of the pressing hole and the amount of collapse Formula L1 was calculated. The relational expression L1 between the depth of the pressing hole and the amount of collapse is such that the greater the depth of the pressing hole, the greater the amount of collapse, and using the relational expression L1 between the depth of the pressing hole and the amount of collapse, The caulking state of the cylindrical member 12 with respect to the cylindrical member 11 is inspected.

  When inspecting the caulking state of the cylindrical member 12 with respect to the shaft-shaped member 11, as shown in FIG. 6, the depth D of the pressing hole portion 12a is located above the pressing hole portion 12a formed in the cylindrical member 12. A shape measuring device 55 for measuring the depth D of the pressing hole 12a is measured by the shape measuring device 55. As the shape measuring device, a laser type or contact type shape measuring device can be used.

  Next, from the measured depth D of the pressing hole 12a, using the relational expression L1 between the depth of the pressing hole and the amount of collapse shown in FIG. Estimate the amount of fall. Then, it is determined whether or not the estimated fall amount is within a predetermined range set in advance.

  It is determined that the caulking state is normal when the estimated amount of falling is within a predetermined range set in advance, and is determined that the caulking state is abnormal when it is larger or smaller than the predetermined range set in advance. For example, a range of 0.15 mm to 0.35 mm is set as the predetermined range.

  In the present embodiment, when the estimated amount of collapse is smaller than a predetermined range and the caulking state is determined to be abnormal, the caulking tool 45 is pressed to one end surface of the cylindrical member 12 at a position different from the pressing hole portion 12a. Then, another pressing hole portion different from the pressing hole portion 12a is formed, and the inner portion of the other pressing hole portion in the tubular member 12 is caused to fall into the groove portion 11a of the shaft-shaped member 11 so that the shaft-shaped member 11 After the cylindrical member 12 is caulked again, the caulking state of the cylindrical member 12 with respect to the shaft member 11 is reinspected.

  When the estimated amount of collapse is less than the predetermined range and the caulking state is determined to be abnormal by the caulking process inspection, the estimated amount of collapse is less than the predetermined range and the caulking state is determined to be abnormal The caulking tool 45 is rotated so as to be pressed at a position different from the pressing hole portion 12a on the one end surface of the cylindrical member 12, and is rotated, for example, 90 degrees, so that the pressing hole portion shown in FIG. 4 (d) and FIG. Similarly to the formation of 12a, the caulking tool 45 is pressed against one end surface of the cylindrical member 12, and another pressing hole is formed on the one end surface of the cylindrical member 12 by the caulking tool 45. The cylindrical member 12 is caulked with respect to the shaft-like member 11 by causing the inner portion of the other pressing hole portion to fall into the groove 11 a of the shaft-like member 11.

  And based on the shape of the said other press hole part formed in the end surface of the cylindrical member 12, specifically, the cylindrical member 12 with respect to the shaft member 11 based on the depth of the said other press hole part. The caulking state is determined again.

  Similar to the formation of the pressing hole portion 12 a shown in FIG. 6, the shape measuring device 55 is arranged above the other pressing hole portion formed on one end surface of the cylindrical member 12, and the other shape measuring device 55 uses the shape measuring device 55. The cylindrical member 12 is measured using the relational expression L1 between the depth of the pressing hole and the amount of collapse shown in FIG. 7 from the measured depth of the other pressing hole. The amount of collapse of the inner portion of the other pressing hole is estimated.

  Then, it is determined whether or not the fall amount of the inner portion of the other pressing hole portion in the estimated cylindrical member 12 is within a predetermined range of the preset fall amount, and is within the preset predetermined range. When it is determined that the caulking state is normal, it is determined that the caulking state is abnormal when it is larger or smaller than a predetermined range.

  In this embodiment, the shape measuring instrument 55 measures the depth of the pressing hole as the shape of the pressing hole, and determines the caulking state based on the depth of the pressing hole, but for example, the shape of the pressing hole It is also possible to measure the area of the pressing hole and determine the caulking state based on the area of the pressing hole.

  Further, in the present embodiment, the caulking groove 11 a formed on the outer peripheral surface of the shaft-shaped member 11 is provided over the entire circumferential direction of the shaft-shaped member 11. It is also possible to provide a part in the circumferential direction of the shaft-shaped member 11 corresponding to the positions of the pressing hole part 12a formed on one end surface of the shaped member 12 and the other pressing hole part.

  As described above, in the caulking processing inspection method according to the present embodiment, the cylindrical coupling member 12 is compared with the coupled member 11 in which the caulking groove 11a is formed on the outer peripheral surface of the shaft-shaped coupled member 11. Are fitted so as to face the groove 11a of the coupled member 11, and a pressing hole 12a is formed on one end surface of the coupling member 12, so that the inner portion 12b of the pressing hole 12a in the coupling member 12 falls into the groove 11a. After the coupling member 12 is caulked with respect to the coupled member 11, the shape of the pressing hole portion 12a is measured, and the caulking state of the coupling member 12 is determined based on the measured shape of the pressing hole portion 12a. .

  Thereby, even when the caulking coupling part 13 cannot be visually recognized from the outside, the coupling member can be measured by measuring the shape of the pressing hole 12a formed on the one end surface of the coupling member 12 having a correlation with the caulking state of the coupling member 12. The twelve crimped states can be inspected with high accuracy. Even when the caulking tool 45 is worn, the caulking state of the coupling member 12 can be accurately inspected by measuring the shape of the pressing hole portion 12a formed on the one end surface of the coupling member 12. Even when the load applied to the coupling member 12 when the coupling member 12 is pressed by the caulking tool 45 is limited to a predetermined value or less, the caulking state of the coupling member 12 can be accurately inspected.

  In the present embodiment, the depth of the pressing hole portion 12a formed on one end face of the coupling member 12 is measured, and the caulking state of the coupling member 12 is determined based on the measured depth D of the pressing hole portion 12a. By measuring the depth D of the pressing hole portion 12a formed on one end face of the coupling member 12 having a correlation with the caulking state of the coupling member 12, the caulking state of the coupling member 12 can be inspected with high accuracy relatively easily. Can do.

  Further, when the amount of collapse W of the coupling member 12 is estimated based on the shape of the pressing hole portion 12a formed on one end surface of the coupling member 12, and the estimated amount of collapse W of the coupling member 12 is within a predetermined range, the coupling member 12 is determined to be normal, and it is determined that the caulking state of the coupling member 12 is abnormal when the amount of collapse W of the coupling member 12 is larger or smaller than a predetermined range. As a result, the normality and abnormality of the caulking state of the coupling member 12 can be determined using the collapse amount W of the coupling member 12 estimated based on the shape of the pressing hole portion 12a formed on the one end surface of the coupling member 12. .

  Further, when it is determined that the amount of tilting W of the coupling member 12 is smaller than a predetermined range and the caulking state of the coupling member 12 is abnormal, the caulking tool 45 is pressed against one end surface of the coupling member 12 to cause another pressing hole portion. After the coupling member 12 is caulked again with respect to the coupled member 11, the shape of the other pressing hole is measured, and the coupling member is based on the measured shape of the other pressing hole. Twelve caulking states are determined.

  As a result, when it is determined that the crimping state of the coupling member 12 is smaller than a predetermined range and the caulking state is abnormal, the coupling member 12 is formed after another pressing hole portion is formed on one end face of the coupling member 12 and then caulked again. 12 can be inspected again, and the caulking state of the coupling member 12 can be detected with high accuracy.

  The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the scope of the present invention.

  As described above, according to the present invention, it is possible to accurately detect the caulking state of the coupling member even when the caulking coupling portion cannot be visually recognized from the outside. Therefore, the accuracy of the caulking coupling portion that cannot be visually recognized from the outside is required. In such a case, it may be suitably used.

DESCRIPTION OF SYMBOLS 1 Piston 3 Piston pin 5 Connecting rod 10 Dynamic vibration absorber 10a Fixed part 10b Movable part 10c Support part 11 Axis member 11a Groove part 12 Cylindrical member 12a Pressing hole part 13 Caulking joint part 45 Caulking tool 55 Shape measuring instrument

Claims (4)

The coupling member formed in a cylindrical shape is fitted to the coupled member in which the caulking groove is formed on the outer peripheral surface of the coupled member formed in a shaft shape so as to face the groove of the coupled member. In addition, by pressing a caulking tool on one end surface of the coupling member to form a pressing hole portion, the inner portion of the pressing hole portion of the coupling member is caused to fall into the groove portion, and the coupling member is A caulking process inspection method for caulking the coupling member,
A pre-measurement step of forming a press hole portion for a plurality of pre-measurement coupling members in advance, measuring the depth of the press hole portion and the amount of collapse of the inner portion thereof, and acquiring the relationship between the two,
A pressing hole forming step for forming a pressing hole in the coupling member to be inspected;
A pressing hole part depth measuring step for measuring the depth of the pressing hole part formed in the pressing hole part forming step ;
Based on the depth of the pressing hole portion measured in the pressing hole portion depth measurement step and the relationship acquired in the preliminary measurement step, the amount of collapse of the inner portion of the pressing hole portion in the coupling member to be inspected is calculated. A fall amount estimation step to be estimated;
A caulking state determination step of determining a caulking state of the coupling member to be inspected based on the amount of collapse estimated in the collapse amount estimation step ;
A caulking processing inspection method characterized by comprising: In the pre-measurement step, as the member to be coupled, a member that does not have a tip portion where a groove is formed is used, and a pressing hole is formed on one end surface of the pre-measurement coupling member fitted to the member to be coupled. The caulking processing inspection method according to claim 1, wherein the depth of the pressing hole portion and the amount of collapse of the inner portion thereof are measured . The caulking state determination step determines that the caulking state is normal when the inclining amount of the coupling member to be inspected estimated in the inclining amount estimation step is within a predetermined range, and the inclining amount of the coupling member to be inspected Determining that the caulking state is abnormal when is greater than or less than a predetermined range;
The caulking processing inspection method according to claim 1, wherein the caulking process is performed. In the caulking state determination step, when it is determined that the amount of collapse of the coupling member to be inspected is smaller than a predetermined range and the caulking state is abnormal, the caulking tool is placed on the one end face of the inspection target coupling member in the pressing hole. with respect to the target binding member by tilt down the inner portion of the other pressing bore portion in said groove by forming a different other pressing bore portion and the pressing hole by pressing a position different from the parts after re-caulking coupling member of the inspected Te to, includes a re-inspection step of retesting the caulking state of the inspected coupling member with respect to the target binding member,
The re-inspection step measures the shape of the other pressing hole, and determines the caulking state of the coupling member to be inspected based on the measured shape of the other pressing hole.
The caulking processing inspection method according to claim 3.

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