JP3199574B2 - Joining method and joining structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method and a joining structure for joining first and second members together by plastically deforming the first and second members.

[0002]

2. Description of the Related Art The present applicant has previously disclosed Japanese Patent Application Laid-Open No. 61-2902.
In Nos. 21 and 61-290222, the cylindrical portion of the first member (nut) is axially compressed while the cylindrical portion of the first member (nut) is inserted into a hole provided in the second member, and the peripheral wall of the cylindrical portion is reduced. A joining method and a joining structure for joining the first member and the second member by plastically deforming so as to spread outward in a brim shape and caulking the second member at the deformed portion have been proposed.

[0003] The present applicant has previously disclosed in Japanese Patent Application Laid-Open No. 61-29.
No. 4208, at least a portion having a tubular portion,
A first member provided with a fitting groove having an axial portion extending in the axial direction from one end of the cylindrical portion and a circumferential portion extending in the circumferential direction on the peripheral wall of the cylindrical portion; and A second member having a plate-like portion in part and having a coupling hole partially provided with a fitting protrusion in the plate-like portion is provided, and the fitting protrusion is provided with the cut groove. After inserting the cylindrical portion into the coupling hole so as to penetrate into the axial direction portion, the first member is rotated relative to the second member to cause the fitting protrusion to move. The tip of the swaging piece formed between the tip of the tubular part of the tubular part and the circumferential part of the cut is then allowed to penetrate from the axial part of the kerf to the circumferential part. A coupling method and a coupling structure in which a portion is deformed to caulk the fitting projection with the caulking piece have been proposed.

[0004]

SUMMARY OF THE INVENTION The present invention further improves the above-mentioned conventional joining method, and can reliably prevent the occurrence of backlash between the two members to be joined, and at the same time, is a low-cost joining method and joining method. The purpose is to provide a structure.

[0005]

SUMMARY OF THE INVENTION A coupling method and a coupling structure according to the present invention have a cylindrical portion at least in a part, and a shaft extending from one end of the cylindrical portion to a peripheral wall of the cylindrical portion in an axial direction. A first member provided with a cut groove having a direction portion and a circumferential direction portion extending in the circumferential direction continuously to the axial direction portion, and at least a portion having a plate-shaped portion, A second member provided with a coupling hole and a pressing piece projecting inward of the coupling hole from a peripheral edge of the coupling hole is prepared, and the pressing piece is provided on the axial portion of the cut groove. After inserting the cylindrical portion into the coupling hole so as to penetrate, the first member is relatively rotated with respect to the second member, and the pressing piece is formed in the axial portion of the cut groove. From above into the circumferential direction portion, and thereafter, the pressing piece is bent toward the inner circumference of the cylindrical portion. By compressing the cylindrical portion in the axial direction of the cylindrical portion, the peripheral wall at the one end of the cylindrical portion is plastically deformed so as to expand outwardly in a brim shape. Is to be caulked.

[0006]

According to the present invention, the plastically deformed portion of the first member becomes annular and double in a state in which the pressing piece is fitted in the circumferential portion of the cut groove to caulk the second member. Up,
Since the pressing piece of the second member is also bent toward the inner periphery of the cylindrical portion of the first member to restrain the first member, it is possible to reliably prevent the occurrence of play between the two members. .

[0007] Since the step of bending the pressing piece and the step of forming the plastically deformed portion can be performed substantially in one step, both members can be connected at low cost.

In addition to the plastically deformed portion, the cylindrical portion of the first member is plastically compressed in the axial direction by compressing the cylindrical portion in the axial direction so that the peripheral wall of the cylindrical portion expands outward in a brim shape. By providing a deformed brim-shaped portion and fitting a reinforcing plate to the cylindrical portion, and holding the reinforcing plate and the second member between the brim-shaped portion and the plastically deformed portion, reinforcement is achieved. Since the connecting portion between the first member and the second member can be reinforced by the plate, the bonding strength can be improved without increasing the thickness of the plate portion of the second member, and the cost can be improved. Reduction can be achieved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. 1 to 16 show a first embodiment of the present invention. FIGS. 1 to 4 show the first member 1 alone in the present embodiment before coupling, and the first member 1 is made of metal such as steel, and has a narrowed portion 2 formed at one end. It has a cylindrical shape. A female screw portion 3 is provided on the inner periphery of the throttle portion 2 of the first member 1. Further, the first member 1
In the vicinity of the end opposite to the narrowed portion 2 of the drawing, a brim-shaped portion 4 is provided. The collar 4 is formed by compressing the first member 1 in the axial direction while a portion of the first member 1 where the collar 4 is to be formed is not restrained from deforming outward. The peripheral wall of the portion of the first member 1 is plastically deformed so as to spread outward in a brim shape.

A groove 5 is provided between the end of the first member 1 on the side of the flange 4 and the flange 4, and the groove 5 extends in the axial direction of the first member 1. Axial portion 5a extending to
And a circumferential portion 5b extending in the circumferential direction. The axial portion 5a and the circumferential portion 5b are continuous with each other.

FIGS. 5 and 6 show the second member 6 of the present embodiment alone before coupling. This second member 6 is made of a metal plate such as steel, and has a slightly raised central portion. A coupling hole 7 having a diameter slightly larger than the outer diameter of the first member 1 is provided at the center. The coupling hole 7 has a substantially circular shape, but a holding piece 8 protrudes from the periphery of the coupling hole 7 toward the inside of the coupling hole 7.

FIGS. 7 to 15 show a process of connecting the first member 1 and the second member 6 in this embodiment. To explain this, first, as shown in FIG. 8, an annular reinforcing plate 14 is fitted to the first member 1 from the end on the side of the cut groove 5, and
As shown in FIG. 7 and FIG.
The first member 1 and the second member 6 are relatively axially moved with the position of the axial portion 5a of the cut groove 5 of the first member 1 being adjusted. Is inserted into the coupling hole 7 of the second member 6, and at the same time, the holding piece 8 is made to enter the axial portion 5 a of the cut groove 5. And the holding piece 8 is the axial portion 5
When the end of a is reached, as shown by arrow A in FIG.
The first member 1 is relatively rotated with respect to the second member 6 so that the holding piece 8 enters the circumferential portion 5b of the cut groove 5 as shown in FIGS. At this point, the first member 1 is already in contact with the second member 6 in the circumferential portion 5 of the kerf 5.
A part of the gap between the peripheral edge of b and the holding piece 8 cannot be moved in the axial direction beyond a slight gap, and cannot be rotated to the end side of the circumferential portion 5b.

Next, a caulking operation is performed in this state. In FIGS. 11 to 14, reference numerals 9 and 11 denote dies for performing the caulking operation. The lower mold 9 is fixed at a fixed position, and is provided with a support hole 10 having a circular cross section having a diameter slightly larger than the outer diameter of the first member 1 in a vertical direction. The upper mold 11 has a stepped cylindrical shape having an enlarged portion 11a and a small-diameter portion 11b protruding below the enlarged portion 11a. The small-diameter portion 11b is
Has an outer diameter slightly smaller than the inner diameter of. The enlarged portion 11a has an outer diameter larger than that of the small diameter portion 11b, and the bottom surface 11c of the enlarged portion 11a has a planar shape extending in the horizontal direction. In the small diameter portion 11b, a linear groove 12 having a width slightly larger than the width of the holding piece 8 is provided in a direction parallel to the axial direction of the small diameter portion 11b. The upper mold 11 is raised and lowered above the lower mold 9 by a press machine (not shown).

As shown in FIG. 11, the first member 1 is fitted into the support hole 10 of the lower mold 9 with the end on the side of the cut groove 5 facing upward, and the pocket 4 is lowered. The first member 1 and the second member 6 are set on the lower mold 9 by being brought into contact with the upper surface of the side mold 9 (note that the first member 1 and the second member 1 in FIG. The cross-sectional position of the second member 6 corresponds to the line XI-XI in FIG. 9). At this time, the axis of the upper mold 8 and the axis of the first member 1 are made to coincide with each other, and the position of the groove 12 of the upper mold 11 and the position of the holding piece 8 are also adjusted.

Next, when the upper mold 11 is lowered in this state, the small-diameter portion 11b of the upper mold 11 enters the inside of the first member 1 as shown in FIGS. 1
The lower end of 1 b abuts on the holding piece 8, and the holding piece 8 is bent toward the inner periphery of the first member 1.

When the upper mold 11 is further lowered,
Since the bottom surface 11c of the large-diameter portion 11a presses the end of the first member 1 on the side of the cut groove 5 in the axial direction, of the first member 1,
The peripheral wall at the portion between the end on the side of the kerf 5 which is not restrained from deforming outward and the coupling hole 7 is plastically deformed so as to spread outward in a brim shape as shown in FIGS. The deformed part is indicated by reference numeral 13).

With this, while the pressing piece 8 is fitted in the circumferential portion 5b of the cut groove 5, the plastically deformed portion 1
3 becomes annular and double, and the second member 6 is
In addition to caulking together with 4, the holding piece 8 also restrains the first member 1 by being bent toward the inner periphery of the first member 1, so that the first member 1 and the second member 6 To a completely fixed state.

FIG. 16 shows the first member 1 after the caulking operation is completed.
FIG. 4 is a vertical cross-sectional view showing a state of the second member 6 (however, this figure shows a state used as a floor support as described later).

As described above, in the present joining method and joining structure, the plastically deformed portion 13 becomes annular and double in a state in which the pressing piece 8 is fitted in the circumferential portion 5b of the cut groove 5, and the second In addition to caulking the member 6, the pressing piece 8 also bends toward the inner periphery of the first member 1 to restrain the first member 1, so that the play between the members 1 and 6 is surely prevented. Can be prevented.

Since the step of bending the holding piece 8 and the step of forming the plastically deformed portion 13 can be performed substantially in one step, the two members 1 and 6 can be connected at low cost.

In the present embodiment, in particular, the peripheral wall of the first member 1 is outwardly compressed by compressing the first member 1 in the axial direction separately from the plastic deformation portion 13. A brim-shaped portion 4 formed by plastic deformation so as to spread in a brim shape is provided, and a reinforcing plate 14 is fitted to the first member 1, and the reinforcing plate 14 and the second member 6 are plastically deformed. Since the first member 1 and the second member 6 are sandwiched by the deformed portion 13, the joint between the first member 1 and the second member 6 can be reinforced by the reinforcing plate 14. Therefore, the bonding strength can be improved without increasing the thickness of the second member 6, so that the cost can be reduced.

FIG. 16 shows a state in which the first member 1 and the second member 6 joined as described above are used as floor supports. A screw support 16 having an external thread 15 provided on the outer periphery is screwed into the female screw 3 of the first member 1, and a floor support plate 17 is attached to the upper end of the screw support 16. . A floor 18 is placed on the floor support plate 17.

FIGS. 17 to 20 show a second embodiment of the present invention. The first member 1 in this embodiment has a longer portion of the first member 1 in which the axial portion 5a of the cut groove 5 is provided than in the first embodiment. ing. The second member 6 is the same as that of the first embodiment.

In FIGS. 17 to 19, reference numerals 9 and 19 denote dies for caulking in the second embodiment.
The lower mold 9 is the same as that of the first embodiment. The upper mold 19 includes an enlarged portion 19a and the enlarged portion 19a.
a small-diameter portion 19b protruding downwardly from a. The small-diameter portion 19b has an outer diameter slightly smaller than the inner diameter of the first member 1. The enlarged portion 19a has an outer diameter larger than that of the small diameter portion 19b, and the bottom surface 19c of the enlarged portion 19a has a flat shape extending in the horizontal direction. Further, a portion of the bottom surface 19c of the enlarged portion 19a around the small diameter portion 19b has an inner diameter equal to the outer diameter of the small diameter portion 19b and an outer diameter slightly larger than the outer diameter of the first member 1. An annular groove 19d is provided. The small diameter portion 1
9b, a linear groove 20 having a width slightly larger than the width of the holding piece 8 is provided in a direction parallel to the axial direction of the small diameter portion 19b. The upper mold 19 is moved up and down above the lower mold 9 by a press machine (not shown).

In this embodiment, as in the case of the first embodiment, the first member 1 is inserted into the coupling hole 7 of the second member 6 and the pressing piece 8 of the second member 6 is inserted. The first member 1 is made to enter the circumferential direction portion 5b through the axial direction portion 5a of the cut groove 5. Next, in this state, the first member 1 is fitted into the support hole 10 of the lower mold 9 with the end on the side of the cut groove 5 facing upward as shown in FIG. The first member 1 and the second member 6 are set on the lower mold 9 by bringing the part 4 into contact with the upper surface of the lower mold 9.
At this time, the axis of the upper mold 19 and the axis of the first member 1 are made to coincide with each other, and the position of the groove 20 of the upper mold 19 and the holding piece 8 is also adjusted.

Next, when the upper mold 19 is lowered in this state, as shown in FIG.
Penetrates into the inside of the first member 1, the lower end of the small-diameter portion 19 b contacts the holding piece 8, and the holding piece 8 is bent toward the inner periphery of the first member 1.

When the upper mold 19 is further lowered,
Since the ceiling surface of the groove portion 19d of the large diameter portion 19a presses the end of the first member 1 on the side of the cut groove 5 in the axial direction, the upper side of the first member 1 is not restricted from being deformed outward. Mold 19
19 is plastically deformed so that the peripheral wall of the portion between the lower surface 19c of the large diameter portion 19b and the coupling hole 7 is double-folded as shown in FIG. 13).

Then, as in the case of the first embodiment, the plastically deformed portion 13 is annularly and double-shaped while the holding piece 8 is fitted in the circumferential portion 5b of the cut groove 5 as in the first embodiment. As a result, the second member 6 is swaged together with the reinforcing plate 14, and the pressing piece 8 is also bent toward the inner periphery of the first member 1 to restrain the first member 1, so that the first member 1 The first and second members 6 are completely fixed with respect to each other.

FIG. 20 is a longitudinal sectional view showing the state of the first member 1 and the second member 6 after the above-mentioned caulking operation is completed.
In the case of the present embodiment, the portion near the end on the side of the cut groove 5 of the first member 1 is protected by the inner and outer peripheral surfaces of the groove 19d of the upper mold 19 and maintains the initial cylindrical shape. After the caulking operation is completed, the portion of the first member 1 that has maintained the tubular shape near the end on the side of the cut groove 5 can be used for fitting another member or the like.

In each of the above embodiments, the number of the cut grooves 5 and the number of the holding pieces 8 are one, but the number of the cut grooves 5 and the number of the holding pieces 8 may be two or more.

In each of the above embodiments, the entire first member 1 has a cylindrical shape. However, in the present invention, only a part of the first member 1 has a cylindrical shape. The first member and the second member may be combined by deforming the shape. Further, in each of the above embodiments, the entire second member 6 has a plate shape, but in the present invention, only a part of the second member has a plate shape, and the second member 6 is connected to the plate portion. A hole may be provided.

In each of the above embodiments, the end of the axial portion 5a of the cut groove 5 is the start of the circumferential portion 5b so that the cut groove 5 has an L-shape as a whole.
As shown in FIG. 21, the axial portion 5a of the kerf 5 is the circumferential portion 5b.
May intersect with the middle part, so that the kerf 5 has a T-shape as a whole.

In each of the above-described embodiments, the first member 1 is connected to the coupling hole 7 after forming the collar portion 4 first.
And press the holding piece 8 in the circumferential direction 5 of the groove 5.
b, after which a brim-shaped plastically deformed portion 13 is formed. In the present invention, the first brim-shaped portion corresponding to the brim-shaped portion 4 in each of the above-described embodiments is not formed. The cylindrical part of the member is inserted into the coupling hole, and the holding piece is made to enter the circumferential part of the kerf. Thereafter, the cylindrical part of the first member is compressed in the axial direction, and the collar part in each of the above embodiments is compressed. 4 and the plastically deformed portion 13 may be formed at the same time.

[0034]

As described above, the coupling method and the coupling structure according to the present invention can reliably prevent the occurrence of play between the first member and the second member to be coupled, and at a low cost. Excellent effects such as the ability to join both members can be obtained.

[0035]

[Brief description of the drawings]

FIG. 1 is a front view showing a first member according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a first member in the first embodiment.

FIG. 3 is a bottom view showing a first member in the first embodiment.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a plan view of a second member in the first embodiment.

FIG. 6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a bottom view showing a state where the first member is inserted into the coupling hole of the second member in the first embodiment.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7;

FIG. 9 is a bottom view showing a state in which the pressing piece of the second member has entered the circumferential portion of the cut groove of the first member in the first embodiment.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

FIG. 11 is a longitudinal sectional view showing a state at the time of starting the caulking operation in the first embodiment.

FIG. 12 is a longitudinal sectional view showing a state in which the upper mold is lowered halfway in the first embodiment.

13 is a sectional view taken along line XIII-XII in FIG.

FIG. 14 is a sectional view showing a state in which the upper mold is lowered to the lower limit position in the first embodiment.

FIG. 15 is an enlarged sectional view showing the vicinity of a plastic deformation portion in FIG. 14;

FIG. 16 is a cross-sectional view showing a state where the first member and the second member after the completion of connection in the first embodiment are used as floor supports.

FIG. 17 is a longitudinal sectional view showing a state at the time of starting a caulking operation in the second embodiment of the present invention.

FIG. 18 is a longitudinal sectional view showing a state in which the upper mold is lowered halfway in the second embodiment.

FIG. 19 is a longitudinal sectional view showing a state in which the upper mold is lowered to the lower limit position in the second embodiment.

FIG. 20 is a longitudinal sectional view showing the first member and the second member after the completion of connection in the second embodiment.

FIG. 21 is a front view showing still another embodiment of the first member according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first member 4 brim portion 5 kerf 5 a axial portion 5 b circumferential portion 6 second member 7 coupling hole 8 holding piece 13 plastic deformation portion 14 reinforcing plate

Claims (4)

(57) [Claims] At least a part has a cylindrical portion, and an axial portion extending in an axial direction from one end of the cylindrical portion is formed on a peripheral wall of the cylindrical portion, and a circumferential direction is formed continuously with the axial portion. A first member provided with a kerf having an extending circumferential portion, and at least a portion having a plate-like portion, the plate-like portion having a coupling hole, and a peripheral portion of the coupling hole; And a second member provided with a pressing piece that protrudes inward, and the cylindrical part is inserted into the coupling hole so that the pressing piece enters the axial portion of the cut groove. After the insertion, the first member is rotated relative to the second member to cause the pressing piece to penetrate from the axial portion of the cut groove to the circumferential portion, and then, the pressing member Bending the piece toward the inner periphery of the tubular portion and compressing the tubular portion in the axial direction of the tubular portion. Ri, the one end side of the peripheral wall of the tubular portion is plastically deformed so as to spread the collar outward coupling wherein the crimping said second member in the plastic deformation portion. 2. A flange portion formed by plastically deforming the cylindrical portion separately from the plastically deformed portion so as to expand the peripheral wall of the cylindrical portion outwardly by compressing the cylindrical portion. 2. The method according to claim 1, further comprising: fitting a reinforcing plate to the cylindrical portion, and holding the reinforcing plate and the second member between the collar portion and the plastically deformed portion. 3. At least a part of the cylindrical portion has a cylindrical portion, and an axial portion extending in an axial direction from one end of the cylindrical portion is formed on a peripheral wall of the cylindrical portion. A first member provided with a kerf having an extending circumferential portion, and at least a portion having a plate-like portion, the plate-like portion having a coupling hole, and a peripheral portion of the coupling hole; And a second member provided with a pressing piece that protrudes inward, and the cylindrical part is inserted into the coupling hole so that the pressing piece enters the axial portion of the cut groove. After the insertion, the first member is rotated relative to the second member to cause the pressing piece to penetrate from the axial portion of the cut groove to the circumferential portion, and then, the pressing member Bending the piece toward the inner periphery of the tubular portion and compressing the tubular portion in the axial direction of the tubular portion. Ri, the tubular portion of the plastically deformed to one end of the peripheral wall extending flange-like outwardly, becomes the second member in the plastically deformed portion is caulked coupling structure. 4. A collar formed by plastically deforming the cylindrical portion separately from the plastic deformation portion so as to expand the peripheral wall of the cylindrical portion outwardly by compressing the cylindrical portion. 4. A coupling structure according to claim 3, wherein a reinforcing plate is fitted to said tubular portion, and said reinforcing plate and said second member are sandwiched between said collar portion and said plastically deformed portion.