JPH10202339A - Forming method for housing with flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a forming method for a housing with flange having high dimensional precision by pressing the end parts of a billet, forming a perform having almost the same thickness of an opening hole part opened in at least one end as the desired thickness of the flange and expanding the diameter toward the end part while holding the thickness of the opening part. SOLUTION: The extrusion is applied to the billet 1 from both ends of form the preform 11 having the H state cross section composed of a bottom part 12 dividing into two inner peripheral spaces of a cylindrical wall part 13 having the first opening hole part 16 and the second opening hole part 17. The first opening hole part 16 is formed as parallel to the axial so as to continue from the second opening hole part 17 with the same thickness as the thickness of the flange 32 in the desired housing 31 with flange. An intermediate formed product 21 punching out near the center of the bottom part 12 of the preform 11 is formed and the first opening hole part 16 is bent to form the housing 31 with flange forming the flange 32 gradually expanding the diameter toward the end part. By this method, since this forming can be executed by reducing the deforming quantity, the load to a die is reduced and the service life of the die an be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a flanged housing which is a component of a ball joint or the like used for a suspension system and a steering system of an automobile.

[0002]

2. Description of the Related Art Hitherto, a flanged housing as a component of a ball joint has been formed by cold forging as shown in FIG. That is, extrusion is performed on the columnar material 101 (FIG. 3A), and the first opening 11 is formed at one end.
6. Cylindrical wall 11 having second opening 117 at the other end
3 and a bottom part 112 that divides the inner peripheral space of the wall part 113 into two parts on the inner periphery of the first opening 116 to form a preform 111 having an H-shaped cross section (FIG. 3A). At this time, the volume of the first opening 116 is formed to be substantially the same as the volume of the desired flange 132. Next, the vicinity of the center of the bottom 112 of the preformed product 111 is punched to form an intermediate molded product 121 ((c) in FIG. 3) having an inner peripheral flange 122 provided on the inner periphery.
Pressing and plastically deforming the first opening 116 of the intermediate molded product 121 to form a flange 132 whose diameter gradually increases toward the end,
A flanged housing 131 (FIG. 3D) was formed.

[0003]

According to the above-described cold forging, since the flange 132 is formed by plastically deforming the first opening 116, the amount of deformation of the flange 132 is large and high accuracy cannot be obtained. There is that. Therefore, in order to increase the accuracy of the flange 132, it is conceivable to increase the molding load of the mold. If the molding load of the mold is increased in this manner, the flange 132
Is pressed with a high load, so that the accuracy is improved. But,
Since a high load is applied to the mold as a reaction force, the life of the mold may be shortened.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a method for forming a flanged housing having a high dimensional accuracy and a long mold life.

[0005]

The present invention is as follows.

[0006] First, an end of a columnar material is pressed to open at least one end, and a preform is formed in which the thickness of the opening is substantially the same as the thickness of a desired flange. While maintaining the thickness of the opening at one end of the preform, the opening is bent to form a flange whose diameter gradually increases toward the end.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1D shows a flanged housing 31 formed by the molding method of the present invention, having a first opening 16 at one end and a second opening 17 at the other end. Part 1
Reference numeral 6 denotes a flange 32 whose diameter gradually increases toward the end. Also,
An inner peripheral flange 22 protruding toward the center is formed on the inner periphery of the first opening 16 side.

A method of forming the housing 31 will be described with reference to FIG.

First, a cylindrical material 1 (FIG. 1A) is extruded from both ends, and a cylindrical wall 13 having a first opening 16 at one end and a second opening 17 at the other end. Then, a preform 11 having an H-shaped cross section (FIG. 1 (a)) is formed. Here, the second opening 17 is formed in the same shape as the desired second opening 17 of the flanged housing 31, and the first opening 16 is formed in the same thickness as the desired flange 32 of the flanged housing 31. However, the first opening 16 is formed in parallel with the second opening 17 along the axis. Next, the vicinity of the center of the bottom portion 12 of the preformed product 11 is punched to form an intermediate molded product 21 ((c) in FIG. 1) having an inner peripheral flange 22 provided on the inner periphery. One opening 16 is bent to form a desired flanged housing 31 (FIG. 1D) in which a flange 32 whose diameter gradually increases toward the end is formed.

A process for forming the flanged housing 31 from the intermediate molded product 21 will be described with reference to FIG.

Reference numeral 51 denotes a press device, which includes an upper die 61 and a lower die 81.
Consists of

The upper die 61 has a forming punch 62 disposed along its axis, and the tip of the forming punch 62 has a constraining portion having the same outer diameter as the inner diameter of the inner peripheral flange 22 of the desired flanged housing 31. 63 and a stepped portion 64 which is continuous from the restraining portion 63 and has the same outer peripheral shape as the inner peripheral shape of the desired flange 32 of the flanged housing 31. A ring-shaped punch guide 65 is provided on the outer peripheral side of the forming punch 62, and a spacer 67 is further provided on the outer peripheral side of the punch guide 65. The punch guide 65 and the spacer 67 are assembled together by an upper fixture 66.

The lower die 81 has a through-hole 92 having the same shape as the outer peripheral shape of the desired flanged housing 31 in the upper inner peripheral portion.
Is provided, and a mandrel 84 that faces the forming punch 62 and extends along the axis is disposed in the through hole 92. The distal end of the mandrel 84 has the same outer peripheral shape as the inner peripheral shape of the second opening 17 of the flanged housing 31, and a knockout ring 85 that can move up and down in the vertical direction is disposed between the mandrel 84 and the die 82. The upper surface of the knockout ring 85, the inner peripheral surface of the die 82, and the outer peripheral surface of the mandrel 84 define a stamping space 83. A cylindrical base material 86 is provided below the die 82, and a backup ring 87 is provided on the outer peripheral side of the cylindrical base material 86. Female thread 90 is screwed into the die 8
2 is fixed on the cylindrical substrate 86.

When the flanged housing 31 is formed from the intermediate molded product 21 by the forging device 51, as shown in the left half of FIG.
1 is put into the engraving space 83 of the lower die 81, and then the upper die 6
Lower 1 Then, the forming punch 62 of the upper die 61 is guided to the die engraving space 83 of the die 82, and the first opening 16 is maintained in a state where the thickness s of the first opening 16 of the intermediate molded product 21 is maintained.
Is bent between the step portion 64 of the forming punch 62 and the die 82, and the inner periphery of the inner peripheral flange 22 is formed by the forming punch 6.
As shown in the right half of FIG. 2, the flange 32 that is gradually increased in diameter toward the end is formed. Thereafter, the upper mold 61 is retracted upward, and the knockout ring 85 of the lower mold 81 projects upward, whereby the flanged housing 31 is taken out from the die-cutting space 83 of the lower mold 81, and the molding of the flanged housing 31 is performed. Complete.

Therefore, the flanged housing 31 formed by the above-described molding method is formed by bending the first opening 16 to form the flange 32 whose diameter gradually increases toward the end, so that the deformation of the flange 32 is small. Can be molded. Further, the load applied to the mold can be reduced.

[0017]

As described above, according to the present invention, first, an end of a columnar material is pressed to open at least one end,
Forming a preformed product whose opening thickness is substantially the same as the thickness of the desired flange, then holding the thickness of one end opening of the preformed product and bending the opening. Since the flange whose diameter gradually increases toward the end is formed, the amount of deformation of the flange can be reduced, and the housing with a flange can be formed with high dimensional accuracy. Further, since the amount of deformation of the flange is small, the load applied to the mold can be reduced, and the life of the mold can be extended.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view illustrating a method of forming a flanged housing according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view showing a step of forming a flanged housing from an intermediate molded product in an embodiment of the present invention, in which a left half portion is before molding and a right half portion is after molding.

FIG. 3 is a cross-sectional plan view illustrating a method of forming a flanged housing according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Element material 11 Preform 16 Opening 32 Flange s (Thickness of opening) t Thickness of (Flange)

Claims (1)

[Claims] An opening (1) opened at least at one end.
In the method of forming a flanged housing having a flange (32) whose opening (16) gradually increases in diameter toward the end, first, the end of the cylindrical material (1) is pressed. hand,
Forming a preform (11) having an opening at at least one end and having a thickness (s) of the opening (16) substantially equal to a thickness (t) of the desired flange (32); The thickness (s) of the opening (16) at one end of the preform (11) is maintained, and the opening (16) is bent to form a flange (32) whose diameter gradually increases toward the end. Method of forming a flanged housing.