JPH049705B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method of manufacturing a steering wheel for an automobile, and more particularly, a boss, a boss plate, and a spoke are processed as an integral part, and the spoke is fixedly connected to a ring. , the handle is constructed from two parts, and the boss, boss plate, and spoke are integral parts that can be easily machined with high precision.

BACKGROUND ART Conventionally, in general, a handle with three spokes is made by separately forming a boss 1, a boss plate 2, and three spokes 3, as shown in FIG. 4, the ends of each spoke 3 are welded and connected via an attaching plate 5, requiring nine parts. Further, the boss 1, boss plate 2, and spokes 3 are manufactured using various processing methods such as forging, press working, and cutting, and are further integrated by welding, die casting, and the like. Because of the large number of processing points and steps, there were drawbacks such as poor productivity and high costs. Also,
Since there are many welded parts, distortion is likely to occur, resulting in poor accuracy, and there are also problems such as a lack of reliability due to the influence of the die-casting method on strength.

In order to solve the above problem, the applicant previously proposed a method in which the boss, boss plate, and spokes are integrally processed by hot upsetting forging, but with this method, it is not possible to provide two spokes. I can do it, but
It is impossible to provide three or more long-axis spokes, and although it is possible with hot die forging, the yield will be very poor. In this way, connect the spokes to 3
In cases where the number of sheets is larger than 1,000 mm, no method has conventionally been provided that can be suitably adopted from the viewpoints of workability, yield, strength, etc.

OBJECT OF THE INVENTION This invention aims to solve the above-mentioned conventional problems, and by forming three or more spokes by integrally processing a boss and a boss plate, and fixing the integrally processed spokes to a ring. The aim is to improve productivity, reduce costs, and improve reliability.

Composition of the Invention The present invention has been made to achieve the above-mentioned object, and uses a molten metal extrusion forging method, a semi-melt extrusion forging method, or a hot extrusion forging method to store a workpiece in a cylindrical container of a lower die. After supplying, the upper die is clamped, and the upper and lower punches are operated to pressurize the workpiece, thereby causing the workpiece to flow plastically between the upper and lower dies from the outer periphery of the short cylindrical part to form a disk-shaped flange. , and three or more long axes are formed by extruding in the radial direction through three or more extrusion holes provided in the upper and lower dies at required intervals in the circumferential direction on the outer periphery of the disc-shaped flange forming part, and , Cooling water is injected onto three or more long shaft-shaped materials extruded from the die to remove oxide scale and control extrusion resistance, and a stopper is placed at the tip of the extrusion side to regulate the length of the long shafts. By using the forging method described above, three or more long-axis spokes of a predetermined length, a disk-shaped boss plate connected to one end of the spokes, and a short cylindrical boss portion at the center of the boss plate are integrated by the forging method described above. Then, the spokes are bent into a desired shape, and a hole with a serration is bored in the center of the boss portion, thereby completing an integral part of the boss, boss plate, and three or more spokes. The present invention provides a steering wheel for an automobile, in which each end of the spoke is fixedly connected to a predetermined location of a ring, and a method for manufacturing the steering wheel.

Embodiments Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In the handle shown in FIG. 1, 10 is a boss;
11 is a boss plate, 12 (12A, 12B, 1
2C) is a spoke, and 13 is a ring formed by welding and joining both ends 13a. The above boss 10,
The boss plate 11 and the spokes 12 are integrally manufactured, and the two members together with the ring 13 constitute a handle, and the flattened tips of the spokes 12 are wound around the ring 13 and welded.

The integrally processed product consisting of the boss 10, boss plate 11, and three spokes 12 is formed by the processing process shown in FIG. By extrusion forging method,
Further, the molten material is extruded into a shape as shown in () by a molten metal extrusion forging method or a semi-melt extrusion forging method to form a processed product 30, and then, using the heat of the hot extrusion forging, After bending the long shaft portions 30c that will become the spokes 12 by warm forging or press working as shown in (), and forming recesses 16 from above and below in the short cylindrical portions 30a that will become the boss, as shown in (). A hole is punched in the recess 16, a serration 18 is carved on the inner peripheral surface of the hole 17, and finally (not shown) a flat portion 19 is formed at each tip of the spoke 12, and the above steps are performed continuously. I'm going to

In this embodiment, the steps () to () above are performed by a molten metal extrusion forging method, as shown in FIGS. 3 to 5. In Figures 3 to 5, 20 is the lower die, 21 is the lower punch, 22 is the upper die, 23 is the upper punch, and 24 is the cooling water installed above the workpiece that is extruded from between the dies 20 and 22. The injection device 25 is a stopper installed at the tip of the extruded workpiece.

During processing, first, rotate the die and punch above from 250°.
The molten workpiece 15 is preheated to 300°C and placed in the container 26 of the lower die 20, as shown in FIG.
A fixed amount of hot water is supplied. Then, insert the upper die 22 into the lower die 2.
0 to clamp the mold, the upper punch 23 is lowered, and the molten metal is pressurized between it and the lower punch 21.

Next, as shown in FIG. 4, while the molten metal is pressurized, the lower punch 21 and the upper punch 23 are raised to press the molten metal from both ends in the axial direction.
The processed material is caused to plastically flow and flow in the radial direction into the disc-shaped flange forming gap 27 formed on the inner periphery of the contact surface of the flange, and further, three flange molding holes are formed on the outer periphery of the gap 27 at required intervals. The workpiece is fluidly extruded into the extrusion hole 28 extending in the radial direction. These three extrusion holes 28 are formed with a circular cross section by vertically communicating grooves recessed in the radial direction on the contact surface of the lower die 20 and the upper die 22. A land 29 protruding inward is provided at the opening end on the side of the gap 27, so that when the processed material flows into the extrusion hole 28, frictional resistance is reduced by the nip 29a on the outside of the land 29. Cooling water is injected from the upper cooling water injection device 24 to the workpiece 30 extruded into a rod shape from the outer end opening of the extrusion hole 28, and the workpiece 30 is evenly distributed by removing oxide scale and controlling extrusion resistance. Extrude and control its shape. The tip of the extruded workpiece 30 abuts against the stopper 25 and its length is set to a predetermined length.

After the extrusion process, as shown in FIG. 5, the upper die 22 and upper punch 23 are raised to open the mold, and then the lower punch 21 is raised to discharge and take out the processed product 30.

The processed product 30 processed by the above method has a short cylindrical portion 30a formed between the upper and lower punches, and a gap 27.
It consists of a disk-shaped flange 30b molded with a cylindrical part 30b and a long shaft part 30c molded with an extruded hole 28.
1. The long shaft portion 30c becomes the spoke 12. The processed product 30, as shown in FIG. 2 above,
Sequentially and continuously, bending and drilling are performed,
An integral part including the boss 10, boss plate 11 and three spokes 12 is completed.

Note that the present invention is not limited to the above embodiment, and three or more spokes may be provided, and as shown in FIG. In that case, the shape of the one extrusion hole 28 need only be made into a plate shape. In addition, the shape of the joint of the spoke 12 with the ring 13 is processed appropriately, and the ring 1 is formed by an appropriate method.
May be combined with 3.

Effects of the Invention As is clear from the above explanation, the automobile steering wheel and method for manufacturing the same according to the present invention have the following effects.

Since the boss, boss plate, and three or more spokes are integrally formed, the number of processing steps is reduced compared to the conventional method in which these were processed separately, improving productivity and reducing costs.

Since the boss, boss plate, and three or more spokes are integrated into one part and fixed to the ring, which is made of one part, it can be constructed from two parts, and the number of parts can be significantly reduced compared to conventional models, resulting in lower costs. I can figure it out.

Because the boss, boss plate, and three or more spokes are integrally processed, the only fixed part is the joint between the spokes and the ring, and because there are few fixed joints, there is almost no distortion, improving accuracy and increasing strength. reliability is improved.

Since the boss, boss plate, and spokes are integrally formed by molten metal extrusion forging, semi-molten extrusion forging, or hot extrusion forging, three or more spokes can be provided. In addition, by extruding the processed material that will become the spokes using a land method and injecting cooling water, smooth uniform extrusion can be achieved and controlled into a predetermined shape, and the length direction is controlled by a stopper, making it possible to extend the length. The spokes of the shaft can be formed, and oxidized scale can also be removed by jetting the cooling water.

[Brief explanation of drawings]

Fig. 1 is a plan view of a handle manufactured by the manufacturing method according to the present invention, Fig. 2 (), (),
(), () are machining process diagrams of the boss, boss plate, and spokes that are integral parts of the above handle,
Figures 3 to 5 show processing steps by the molten metal extrusion forging method, Figure 3 is a cross-sectional view of the molten metal supply and pressurized state, Figure 4A is a cross-sectional view of the extrusion pressurized state, and Figure 4B
4A is a sectional view taken along the line B-B in FIG. 4A, FIG. 4C is an enlarged view of the main part, FIG. 5 is a sectional view in a pressurized state, FIG. The figure is a plan view of a conventional handle. 10...Boss, 11...Boss plate, 12...
...Spoke, 13...Ring, 20...Lower die,
21...Lower punch, 22...Upper die, 23...Upper punch, 24...Cooling water injection device, 25...Stopper, 27...Gap, 28...Extrusion hole, 29...
...Rand, 30...Processed product.

Claims (1)

[Scope of Claims] 1. Using a molten metal extrusion forging method, a semi-melt extrusion forging method, or a hot extrusion forging method, after supplying the workpiece into the cylindrical container of the lower die, the upper die is clamped, and then the upper and lower By operating the punch and pressurizing the workpiece, the pressurized material is plastically flowed between the upper and lower dies from the outer periphery of the short cylindrical part to form a disc-shaped flange, and the disc-shaped flange forming part is Forming three or more long axes by extruding in the radial direction through three or more extrusion holes provided in the upper and lower dies at required intervals in the circumferential direction on the outer periphery, and
By injecting cooling water onto three or more long shaft-shaped materials extruded from the die, and by placing a stopper at the tip of the extrusion side to regulate the length of the long axes, three or more long shaft materials of a predetermined length can be extruded. A long-axis spoke, a disk-shaped boss plate connected to one end of the spoke, and a short cylindrical boss portion at the center of the boss plate are integrally formed by the forging method described above, and then the spoke is shaped into a desired shape. At the same time, a hole with a serration is cut in the center of the boss part to complete an integral part of the boss, boss plate, and three or more spokes, and each end of the spoke is shaped into a ring. A method for manufacturing a steering wheel for an automobile, characterized in that it is fixedly connected to a location.