JP4160426B2 - Manufacturing method of caulking assembly - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a caulking assembly, and more particularly, to a caulking assembly in which a protruding size of a caulking processed portion is small and light and inexpensive.
[0002]
[Prior art]
(a) an assembly object provided with a predetermined mounting hole; (b) a shaft-like portion inserted into the mounting hole; and a flange portion larger than the mounting hole provided at one end of the shaft-like portion; And the shaft-shaped portion is inserted into the mounting hole and caulked to the outer peripheral side so that the assembly object is sandwiched between the caulking portion and the flange portion. 2. Description of the Related Art A caulking assembly having caulking parts that are integrally assembled to an assembly object is widely used in various fields. The caulking structure described in paragraph 37, FIG. 10, and FIG. 11 of Patent Document 1 is an example, and the horizontal pipe 13 corresponds to a caulking part.
[0003]
[Patent Document 1]
JP 2000-210738 A (paragraph 37, FIG. 10, FIG. 11)
[0004]
On the other hand, FIG. 4 is a cross-sectional view showing an example of such a conventional caulking assembly, and this caulking assembly 100 is an electrical component used for a battery or the like, and each is composed of a conductive metal material. The plate-like member 102 and the caulking part 104 are provided, and an insulator 106 made of a synthetic resin material is interposed therebetween to insulate them. The caulking part 104 is a forged product and has a bottomed cylindrical shape before caulking, and an outward flange 104a is integrally provided as a flange part at the bottom, and a cylindrical part 104b indicated by a one-dot chain line is an axial shape. It comes to function as a part. Then, an annular insulator 106 is mounted in the mounting hole 102a of the plate-like member 102 in advance, and the cylindrical portion 104b is inserted through the insulator 106 as indicated by a one-dot chain line, and as indicated by a solid line. By caulking so that the front end opening is pushed and expanded to the outer peripheral side, the plate-like member 102 is sandwiched and integrated with the outward flange 104a. Such a caulking assembly 100 has a small protruding dimension of the caulking processed portion and is configured to be lightweight and compact. The plate-like member 102 corresponds to an assembly object.
[0005]
[Problems to be solved by the invention]
However, in such a caulking assembly 100, since the caulking part 104 is manufactured by forging, the cost is increased, and when the cylindrical part 104b is caulked to the outer peripheral side, the tip part (outer peripheral part) is provided. There was a problem that cracking was likely to occur.
[0006]
The present invention has been made in the background of the above circumstances, and an object of the present invention is to provide an inexpensive caulking structure in which defects such as cracks are unlikely to occur during caulking.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, the first invention includes (a) an assembly object provided with a predetermined mounting hole, (b) a shaft-shaped portion inserted into the mounting hole, and a shaft-shaped portion A flange portion larger than the mounting hole provided at one end, and the shaft-shaped portion is inserted through the mounting hole and caulked to the outer peripheral side, whereby the caulking portion and the flange portion A caulking part that is integrally assembled to the assembling object in a state where the assembling object is sandwiched therebetween, and (c) the caulking part as the caulking part, The metal plate material in which the shaft-shaped portion has a bottomed cylindrical shape having a hemispherical bottom portion protruding outward, and an outward flange is integrally provided as the flange portion in the bottomed cylindrical opening portion. A step of preparing a pressed product, and (d) the crimping portion The shaft-like portion of the article, the insertion step of inserting from the bottom side of the bottomed cylindrical shape mounted within the bore of the assembly object, is (e) and the opening of the bottomed cylindrical shape is directed upward A filling step of filling the inside of the shaft-shaped portion with a filler that restricts deformation of the shaft-shaped portion; and (f) an opening at the upper end of the shaft-shaped portion in order to prevent the filler from leaking out. An upper mold having a convex portion inserted into the flange portion, an annular groove provided around the convex portion for positioning the flange portion, and a bottom portion that is brought into contact with the bottom portion of the shaft-shaped portion. A first lower mold having a spherical pressing surface with a small curvature is made to approach in the vertical direction and the axial portion is compressed in the axial direction so that the axial portion is moved to the outer peripheral side by the action of the filler. a bulge step of bulged, thereby removing the filler from (g) the shaft-like portion, the shaft-like portion Using the second lower mold having a flat pressing surface that is brought into contact with the bottom portion, the caulking and the shaft-like portion further compressed in the axial direction between said upper mold and its second lower mold And a caulking process for forming a processed portion.
[0008]
According to a second aspect of the present invention, in the method for manufacturing a caulking assembly according to the first aspect, prior to the bulge step, a plurality of split molds each having an arc-shaped recess corresponding to the outer peripheral shape of the shaft-shaped portion are provided at the tip. Is disposed in the vicinity of the object to be assembled and on the opposite side of the flange part, and the bulge process prevents the bulging range of the shaft-like part from reaching the object to be assembled by the split mold. It is characterized by doing.
[0013]
【The invention's effect】
In the method for manufacturing a caulking assembly according to the first aspect of the present invention, there is provided a metal plate material in which the shaft-shaped portion has a bottomed cylindrical shape, and an outward flange is provided as a flange portion in the bottomed cylindrical opening. The press product is used as a caulking part. First, it is inserted into the mounting hole of the assembly target object from the bottom side of the bottomed cylindrical shape in the insertion step, and then the inside of the bottomed cylindrical shape is filled with the filler in the filling step. After that, by compressing the axial part in the axial direction in the bulge process, the axial part is expanded to the outer peripheral side by the action of the filler, and in the caulking process, the axial part is further compressed in the axial direction. Since it processes, generation | occurrence | production of the crack at the time of the crimping process of a shaft-shaped part is suppressed, and a favorable crimping process part comes to be obtained. Moreover, since a bottomed cylindrical press product is used as the caulking part, it is configured to be lighter and less expensive than the forged product.
In the bulge process, the flange portion is positioned by the annular groove provided in the upper die, and the bottom portion of the shaft portion is positioned by the spherical pressing surface provided in the lower die. It is compressed in the axial direction while being held in a vertical posture, and is bulged to the outer peripheral side substantially evenly around the axis.
[0014]
In the second invention, prior to the bulge step, a plurality of split molds provided with arc-shaped recesses corresponding to the outer peripheral shape of the shaft-shaped portion at the tip are in the vicinity of the assembly object and the flange portion. Since it is arranged on the opposite side and prevents the bulging range of the shaft-like part from reaching the object to be assembled, the object to be assembled with the swelling of the shaft-like part in the bulge process There is no fear of deformation, and good crimping is always performed.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
In the caulking assembly of the present invention, for example, both the assembly object and the caulking part are made of a conductive metal material, and an insulator is provided between the assembling object and the caulking part. Although applied suitably to the electrical component currently interposed, it can be applied also to assembly parts other than an electrical component. The assembly target object and the caulking part do not necessarily have conductivity, and the assembly target object may be made of a material other than a metal material.
[0020]
The assembling target may be provided with a substantially flat assembling portion that is provided with at least a mounting hole and to which a caulking part is assembled, and may include a portion other than the assembling portion integrally. In general, the mounting hole is preferably a circular hole corresponding to the outer peripheral shape of the shaft-like portion, but may be a square hole or the like. The caulking part is a pressed product of a metal plate material integrally including a bottomed cylindrical shaft-shaped portion and an outward flange, but may include a portion other than the shaft-shaped portion and the outward flange, or a separate body. Various aspects are possible, for example, the members manufactured in the above may be integrally fixed by welding or the like. The bottomed cylindrical cylinder of the shaft-like portion is preferably a perfect circle, but an elliptical shape can also be adopted.
[0021]
A caulking part integrally having a bottomed cylindrical shaft-shaped portion and an outward flange is manufactured, for example, by subjecting a flat metal plate material to drawing or overhanging by pressing, but at least a bottomed cylinder shaft-like portion of the shape is not good as long as it is molded by press working.
[0022]
The filling material that fills the inside of the bottomed cylindrical shape in the filling process is incompressible fluid such as water or oil, gas such as air filled in anticipation of volume change, and elastically deformable synthetic resin such as urethane resin When the bottomed cylindrical shaft is compressed in the axial direction, it is deformed inward when the material is an elastic member with relatively little volume change, or a granular material that changes to an arbitrary shape as a whole. What is necessary is just to prevent the volume of the material from decreasing and to bulge and deform toward the outer peripheral side.
[0023]
Crimping step, for example, Ru is configured by crushing the shaft-like portion substantially flat so that the assembling object and the parallel flat surfaces.
[0024]
In the caulking process, the shaft-shaped part is compressed by removing the filler used in the bulge process.For example, when a fluid such as oil or water is used as the filler , a fluid passage is provided in the upper mold used in the bulge process, it can be carried out crimping step using a common upper mold in succession bulge process while discharging the fluid by opening the valve.
[0025]
For example, the second invention is configured to have a pair of split molds having a semicircular arc recess having substantially the same curvature as the mounting hole, but may be configured to be divided into three or more parts. These split molds are arranged so as to be movable in a direction substantially perpendicular to the shaft-like portion of the caulking part, for example, and in the bulge process, the recess at the tip is brought close to substantially surround the shaft-like portion. It should be noted that when the strength of the assembly target is relatively high and the bulging range of the shaft-shaped portion is defined by the assembly target, the split mold is not necessarily required. It is also possible to implement.
[0027]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a caulking assembly 10 manufactured according to the manufacturing method of the present invention , and corresponds to FIG. The caulking assembly 10 is an electrical component used for a battery or the like, and includes a plate-like member 12 and a caulking component 14 each made of a conductive metal material. An insulator 16 made of a synthetic resin material is interposed to insulate them. The caulking part 14 is a press product manufactured by drawing a flat metal plate by pressing. Before caulking, the caulking part 14 has a bottomed cylindrical shape formed by drawing as shown in FIG. The shaft-shaped part 18 and the flange part 20 which consists of the outward flange extended to the outer peripheral side integrally from the bottomed cylindrical-shaped opening part are provided. 2A is a plan view, and FIG. 2B is a front view. The shaft 18 has a substantially circular cross section, and the tip or bottom 22 has a hemispherical shape that protrudes outward. Yes. Further, the outer peripheral shape of the flange portion 20 is a circular shape having a pair of parallel portions by trimming after drawing. In addition, the dashed-dotted line of FIG. 1 is the state before carrying out the crimping process of the axial part 18. FIG.
[0028]
The plate-like member 12 is an assembly object, and is provided with a circular mounting hole 24 that is larger than the shaft-like portion 18 of the caulking part 14 before the caulking process, and the shaft-like portion 18 has a bottomed cylindrical bottom portion 22. It is inserted into the mounting hole 24 from the side, and is compressed in the axial direction in this state, so that it is expanded to the outer peripheral side and flattened as shown by a solid line in FIG. As a result, the plate-like member 12 is sandwiched between the flat portion 26 and the flange portion 20, and the caulking component 14 is integrally assembled to the plate-like member 12 so as not to be detached. The flat part 26 corresponds to a caulking part, and the caulking part 14 has a formability such that the shaft-like part 18 can be crushed substantially flat without causing cracks or cracks.
[0029]
The insulator 16 has a cylindrical portion 28 having a diameter larger than that of the bottomed cylindrical shaft-shaped portion 18 before caulking and approximately the same diameter as the mounting hole 24, and outwardly toward one end of the cylindrical portion 28. The shaft portion 18 inserted into the cylindrical portion 28 is caulked while the cylindrical portion 28 is inserted into the mounting hole 24. The cylindrical portion 28 is bent toward the outer peripheral side, and is assembled to the plate member 12 together with the caulking part 14. The insulator 16 has such elasticity that the cylindrical portion 28 can be bent outward at a substantially right angle without causing cracks or cracks.
[0030]
Next, a method for manufacturing such a caulking assembly 10 will be specifically described with reference to FIG. FIG. 3 (a) is a process of preparing a crimping part 14 before crimping, and a flat metal plate material is subjected to a drawing process by pressing to form a bottomed cylindrical shaft-shaped portion 18. Then, trimming is performed to make the flange portion 20 into a predetermined shape. FIG. 3B shows an insulator assembling step, in which the caulking part 14 is arranged in a substantially vertical posture in which the caulking part 14 faces upward, that is, the opening of the bottomed cylindrical shaft-shaped part 18 faces upward. The cylindrical portion 28 of the insulator 16 is fitted from the flange portion 30 side to the outer peripheral side of the shape portion 18 and combined so that the flange portions 20 and 30 are in close contact with each other. FIG. 3C shows an insertion process, in which the caulking component 14 combined with the insulator 16 is relatively inserted into the mounting hole 24 of the plate-like member 12 from the bottom 22 side of the shaft-like portion 18. The cylindrical portion 28 is fitted inside the mounting hole 24 so that the plate member 12 and the flange portion 30 are brought into close contact with each other. Note that after the cylindrical portion 28 of the insulator 16 is fitted into the mounting hole 24 of the plate-like member 12, the shaft-like portion 18 of the caulking part 14 is inserted into the cylindrical portion 28 of the insulator 16. good.
[0031]
FIG. 3D shows a bulge preparation process in which a pair of split dies 32 and 34 are arranged in the vicinity of the plate-like member 12 and on the opposite side to the flange portions 20 and 30, that is, in contact with the lower surface of the plate-like member 12. In addition, the oil 36 is filled as a filler in the shaft-like portion 18 arranged in a posture in which the bottomed cylindrical opening is directed upward. The split molds 32 and 34 are disposed at symmetrical positions with the shaft-shaped portion 18 in between so as to be able to approach and separate from the shaft-shaped portion 18 substantially vertically, and each has a half of the same curvature as the mounting hole 24. Arc-shaped recesses 38 and 40 are provided at the distal ends, and when the shaft-shaped portion 18 is approached, the recesses 38 and 40 surround substantially the entire circumference of the shaft-shaped portion 18, and the cylindrical portion of the insulator 16. The outer peripheral surface of 28 is substantially contacted. In this bulge preparation step, the portion in which the oil 36 is filled as a filler in the shaft-like portion 18 corresponds to the filling step.
[0032]
FIG. 3 (e) shows a bulge process in which the shaft-shaped portion 18 is compressed in the axial direction by bringing the pair of upper mold 42 and lower mold 44 disposed so as to be close to and away from each other in the vertical direction. The upper mold 42 is integrally provided with a convex portion 46 that is inserted into the opening at the upper end of the shaft-shaped portion 18, and prevents the oil 36 filled in the shaft-shaped portion 18 from leaking freely. Thus, when the shaft-shaped portion 18 is compressed in the axial direction, the pressure of the internal oil 36 increases, and the shaft-shaped portion 18 bulges to the outer peripheral side by this pressure increase. As the shaft-like portion 18 bulges, the cylindrical portion 28 of the insulator 16 is also expanded to the outer peripheral side. However, since the split dies 32 and 34 are disposed below the plate-like member 12, the shaft The bulging range of the cylindrical portion 18 and the cylindrical portion 28 is limited by the split molds 32 and 34, and there is no possibility that the plate-like member 12 is reached and the mounting hole 24 or the like is deformed. Further, an annular groove 48 for positioning the flange portion 20 is provided around the convex portion 46 of the upper die 42, and a portion of the lower die 44 that contacts the bottom portion 22 of the shaft-like portion 18 is A spherical pressing surface 50 having a curvature smaller than that of the bottom portion 22 is provided to position the bottom portion 22, whereby the shaft-like portion 18 is compressed in the axial direction while being held in a substantially vertical posture, It bulges to the outer peripheral side substantially evenly around the axis. The lower mold 44 corresponds to the first lower mold.
[0033]
FIG. 3 (f) shows a caulking process in which the oil 36 in the shaft-shaped portion 18 is discharged and the split dies 32, 34 are separated from the shaft-shaped portion 18 and then flattened in place of the lower die 44. The shaft-shaped portion 18 is further compressed in the axial direction between the lower mold 54 having the pressing surface 52 and the upper mold 42. As a result, the shaft-like portion 18 is flattened into a flat surface parallel to the plate-like member 12, and the flat portion 26 that sandwiches the plate-like member 12 between the flange portion 20 is formed. An assembly 10 is obtained. The lower mold 54 corresponds to a second lower mold.
[0034]
In such a crimping assembly 10 manufacturing method, as the crimping component 14, the shaft-shaped portion 18 has a bottomed cylindrical shape, and an outward flange provided in the bottomed cylindrical opening is provided. A pressed product of a metal plate material that functions as the flange portion 20 is used, and in the bulge process of FIG. 3 (e), compression is performed in the axial direction in a state where the bottomed cylindrical shape of the shaft-like portion 18 is filled with oil 36. In order to form the flat portion 26 by further compressing the shaft-like portion 18 in the axial direction in the caulking process of FIG. Compared with the case where the cylindrical portion 104b is expanded to the outer peripheral side as shown in FIG. 4, cracks are less likely to occur, and a good flat portion 26 without cracks is obtained. Moreover, since the bottomed cylindrical press product is used as the caulking part 14, it is configured to be lighter and less expensive than the forged product.
[0035]
Further, in this embodiment, prior to the bulge process, the bulge preparation process of FIG. 3 (d) was provided, and arc-shaped recesses 38 and 40 corresponding to the outer peripheral shape of the shaft-like portion 18 were provided at the tip. The pair of split dies 32 and 34 are disposed so as to contact the lower surface of the plate-like member 12 and prevent the bulging range of the shaft-like portion 18 from reaching the plate-like member 12 in the bulge process. Therefore, there is no fear that the mounting holes 24 of the plate-like member 12 are deformed as the shaft-like portion 18 bulges, and good crimping is always performed.
[0036]
Further, the caulking assembly 10 of this embodiment is an electrical component, and the plate member 12 and the caulking component 14 are both made of a conductive metal material, but the flat portion 26 of the caulking component 14 is cracked. Since it does not occur, the desired electrical performance can be obtained.
[0037]
In addition, the caulking part 14 of the present embodiment has a hemispherical shape in which the bottom portion 22 of the bottomed cylindrical shaft-shaped portion 18 protrudes outward, so that the cylindrical portion of the shaft-shaped portion 18 and the bottom portion 22 There is no bent part (ridge line part) at the boundary, and the flat part 26 obtained by compressing in the axial direction has a smooth flat surface shape.
[0038]
As mentioned above, although the Example of this invention was described in detail based on drawing, these are one embodiment to the last, and this invention is implemented in the aspect which added the various change and improvement based on the knowledge of those skilled in the art. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a caulking assembly manufactured according to the manufacturing method of the present invention.
FIGS. 2A and 2B are diagrams showing a shape before caulking of a caulking part used in the caulking assembly of FIG. 1, wherein FIG. 2A is a plan view and FIG. 2B is a front view;
FIG. 3 is a diagram for explaining a manufacturing process of the caulking assembly of FIG. 1;
FIG. 4 is a cross-sectional view showing an example of a conventional crimped assembly.
[Explanation of symbols]
10: Caulking assembly 12: Plate member (object to be assembled) 14: Caulking part 16: Insulator 18: Shaft 20: Flange 22: Bottom 24: Mounting hole 26: Flat part (crimping part) 32, 34: Split mold 36: Oil (filler) 38, 40: Recess 42: Upper mold 44: Lower mold (first lower mold) 46: Convex part 48: Circular groove 50: Spherical pressing surface 52 : Flat pressing surface 54: Lower mold (second lower mold)

Claims (2)

An assembly object provided with a predetermined mounting hole;
The shaft-shaped portion inserted into the mounting hole and a flange portion larger than the mounting hole provided at one end of the shaft-shaped portion, the shaft-shaped portion being inserted through the mounting hole and the outer peripheral side By crimping, a crimping part that is integrally assembled to the assembly object in a state where the assembly object is sandwiched between the crimping part and the flange part,
A method for manufacturing a crimped assembly having
As the caulking part, the shaft-shaped portion has a bottomed cylindrical shape having a hemispherical bottom portion protruding outward, and an outward flange is integrally formed as the flange portion in the bottomed cylindrical opening portion. A step of preparing a pressed product of a metal plate material provided in
And inserting step of said shaft-like portion of the caulking parts are inserted from the bottom side of the bottomed cylindrical shape mounted within the bore of the assembly object,
A filling step of filling the inside of the shaft-shaped portion in which the bottomed cylindrical opening is oriented upward with a filler that regulates deformation of the shaft-shaped portion ;
A convex portion inserted into the opening at the upper end of the shaft-shaped portion in order to prevent the filler from leaking, and an annular groove provided around the convex portion to position the flange portion An upper die having a first presser die having a spherical pressing surface with a smaller curvature than the bottom portion, which is brought into contact with the bottom portion of the shaft-shaped portion, and vertically approaching the shaft-shaped portion; A bulge step of bulging the shaft-like portion to the outer peripheral side by the action of the filler by compressing in the axial direction;
The upper die and the second lower die are removed using a second lower die having a flat pressing surface that is brought into contact with the bottom of the shaft-like portion while removing the filler from the shaft-like portion . a crimping step of forming the caulking portion with the hinge-like portion is further compressed in the axial direction between the,
A method for producing a caulking assembly, characterized by comprising: Prior to the bulge process, a plurality of split molds provided with arc-shaped recesses corresponding to the outer peripheral shape of the shaft-like portion at the tip thereof are in the vicinity of the assembly target and opposite to the flange portion 2. The caulking assembly manufacturing method according to claim 1, wherein the split mold prevents the swollen range of the shaft-like portion from reaching the assembly target object in the bulge process. Method.

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