JPS6116101A - Axle case of car and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent the occurrence of unevenness in quality and to simplify production, by a method wherein a titled axle case is formed with a pipe member and is constituted with one part through manufacture of the case by means of 4 processes of a cutting, a slit, a buckling, and a pressing process. CONSTITUTION:In a first process, single pipe member 1 is cut to given lengths. In a second process, slits of a given length are provided in both sides of the pipe member 1. In a third process, buckling is caused at the central part of the pipe member 1. A support groove 8, having both end parts and a central part, which are widened outwardly, is bored in each of bottom and top moulds 6 and 7 to expand the pipe member outwardly, and pressurizing bodies 9 are adapted to pressurize an inner pressure with the aid of the cam mechanism of a press. In a fourth process, a product is formed in a final shape by press, and cores 10 and outer molds 12, each having a product shape groove 11, which are placed in the central part of the pipe member 1 to form a circular final shape, are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an automobile axle case and a manufacturing method thereof.

"Prior Art" A conventional automobile axle case is manufactured as follows. As shown in FIGS. 10 and 11, the pipe members 101 and 102 at both ends are cut to a predetermined length using a grindstone, and the arc-shaped members 103 and 104 at the center are first cut by a shearing machine, and then cut into a predetermined length by a shearing machine. These pipe members 10 are then bent using a press mold, edge cut, and edge cut processed.
The four members 1 and 102 and the arcuate members 103 and 104 are joined as shown, and each joint is welded 1.
It is fixed and integrated by 05. In addition, in the conventional automobile axle case shown in FIGS. 12 and 13, the arcuate members 106 and 107 are made by cutting, bending, edge-cutting, and edge-trimming the plate materials in the same manner as the arcuate members 103 and 104 described above. , both arc members 106 and 107 are joined, and welding 1
It is fixed and integrated in 08.

"Problems to be Solved by the Invention" As mentioned above, conventional automobile axle cases consist of four or two component parts, so their quality varies and they may not always be strong enough. Moreover, the manufacturing process is complicated, requires many man-hours, and is quite expensive, and since welding is used to fix and integrate the component parts, distortion inevitably occurs, and a process to remove the distortion is required. The present invention attempts to solve these problems.

"Means for Solving the Problems" The present invention provides an automobile comprising a single pipe member, the central part of the pipe member being divided into two in the axial direction, and each of the two halves being formed into an arc shape on the same plane. This is an axle case in which the pipe member is cut to a predetermined length, a slit is carved in the center of the pipe member, and pressure is applied from both ends of the pipe member toward the center to open the center part outward from both sides. This is a method for manufacturing an automobile axle case, which is manufactured by expanding it into two parts.

``Example'' The axle case for an automobile of the present invention consists of a single tube member 1, as shown in FIGS. are formed into a circular arc shape 2 on the same plane.

This method of manufacturing an axle case for an automobile includes cutting the tube member 1 in the first step, carving an IJ-slot in the tube member 1 in the second step, and cutting the IJ-slots into the tube member 1 from both ends of the tube member 1 to the center in the third step. In the second step, pressure is applied to buckle the central portion outward on both sides, and in the fourth step, the tube member 1 is pressed firmly.

In the first step, as shown in FIG. 3, the rotary grindstone 3 is brought close to cut the pipe member into a predetermined length.

Next, in the second step, as shown in FIGS. 4 and 5, the rotary grindstone 4 is brought closer to the tube member 1 cut to a predetermined length from both sides, and the tube member 1 is moved in the axial direction. A slit 5 of a predetermined length is carved.

Subsequently, in the third step, the central portion of the tube member 1 is caused to buckle as shown in FIGS. 6 and 7.

The lower die 6 and the upper die 7 are each provided with support grooves 8 which expand outward at both ends and the center, so that the tube member 1 indicated by the two-dot chain line in FIG. expand outwards.

The tube member 1 with the slit 5 cut therein is placed on the lower mold 6, and the pressurizing bodies 9 are inserted from both ends of the tube member 1, and each pressurizing body 9 is pressurized toward the center. Hold. The pressurizing body 9 can be pressurized inward by a cam mechanism of a press, but it can also be pressurized by hydraulic pressure.

In the fourth step, the final shape of the product is formed by pressing as shown in FIGS. 8 and 9. It includes a core mold 10 which is inserted into the center of the tube member l to give it a final arcuate shape 2, and an outer mold 12 in which a product shape groove 11 is carved on the side surface. That is, FIG. 9 shows a schematic example of the mold. Lower mold 13
A central cam 14 having cam surfaces on both sides is provided at the center of the cam.
Core molds 10 are placed on both sides of the core molds 10 so as to be biased toward the center by springs 15. Both sides of the central cam 14 are biased outwardly by springs 16, and springs 1
An outer mold 12 is disposed which is urged upward by 7 and 17, and cams 18 and 18 are provided on the outside of each of the outer molds 12 and 12. Furthermore, spring pressers 20 are provided at positions above the outer mold 12 of the upper mold 19 so as to have a larger biasing force than the springs 17.

When the upper mold 19 rises, the urging force of the spring 15 causes the core molds 10 and 10 to approach the center and rise upward according to the cam surface of the central cam 14, and the outer mold 12 is moved by the springs 16 and 17. It moves outward and upward due to the urging force of and the action of the cam 18. In this state, the tube member 1 is fitted with the core mold 10 in the center, and the tube member 1 is set in the lower mold 13.
After that, the upper die 19 is lowered and pressurized.

Then, the core molds 10, 10 move outward according to the cam surface of the central cam 14, and the outer molds 12, 12 are pressed by the spring retainer 20 and move inward according to the cam 1, and the core molds 10, 10 and the outer molds 12 are used to press the tube member 1 into a predetermined shape. When the upper mold 19 rises, the tube member 1 can be taken out from the lower mold 13.

"Effects of the Invention" The present invention relates to an automobile axle case made of a single pipe member as described above, which is manufactured through four steps of cutting, slitting, buckling, and final pressing. The axle case used to be made up of 4 or 2F hard parts, but since it is made up of one part, there is no variation in quality, the strength is sufficient, the manufacturing process is simplified, and the number of parts has been reduced. This reduces processing man-hours, making it possible to provide inexpensive automobile axle cases, eliminating welding, making it possible to provide products without distortion, and eliminating the need for distortion removal work.

In addition, the inventor used an S G P II tube,
According to an experiment using a 45C, SK3 mold and pressurizing with a hydraulic press, the steel pipe has no twist or eccentricity along its entire length, the cross section of the steel pipe maintains a circular shape without deformation, and the arcuate part follows the shape of the mold. It was something.

[Brief explanation of the drawing]

Fig. 1 is a front view of an automobile axle case according to the present invention, Fig. 2 is a side view of Fig. 1, Figs. A perspective view showing the cutting process in the first step, FIGS. 4 and 5 show the slitting process in the second step, FIG. 4 is a perspective view thereof, and FIG. 5 is a longitudinal sectional view.
Figures 6 and 7 show the buckling process of the third process;
The figure is an exploded perspective view of the same, FIG. 7 is a plan view, FIGS. 8 and 9 show the final pushing stroke of the fourth step, FIG. 8 is an exploded perspective view of the same, and FIG. 9TI! J is a vertical cross-sectional view of the final pressing process, Figures 1θ to 13 show conventional automobile axle cases, Figure 10 is a front view of one example, and Figure 11 is a side view of Figure 10. , FIG. 12 is a front view of another example, and FIG. 13 is a side view of FIG. 12. Applicant Sumi Mori Yone Agent Yoshiteru Takagi 5 Q Figure 7 Figure 8

Claims (2)

[Claims] (1) An automobile axle case consisting of a single pipe member, with the center part of the pipe member divided into two in the axial direction, and each of the two halves formed into an arc shape on the same plane. (2) Automobiles manufactured by cutting a pipe member to a predetermined length, cutting a slit in the center of the pipe member, and applying pressure from both ends of the pipe member toward the center to expand the center part outward on both sides. How to manufacture the axle case of