JPS6111697B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a vehicle rim.

Generally, there is a roll forming method as a method for manufacturing vehicle rims, in which a relatively thin metal plate is sandwiched between rotating rolls, and one rotating roll presses the metal plate against the other rotating roll. It is molded by fitting it into a groove-shaped mold provided on a rotating roll. This forming method is suitable when the mold groove of the rotating roll is shallow, but depending on the cross-sectional shape of the rim, it may be necessary to deep draw or partially protrude, and in such cases, thin-walled materials may be used. It is unsuitable to roll form from scratch. Further, even if it is possible to form the rim from a thin wall, the rim may not have sufficient strength.

The present invention has been made in order to eliminate the above-mentioned conventional disadvantages, and includes a main rotating roll, a main rotating roll that is arranged around the main rotating roll so that it can be approached and removed, and a roller that can be used for each stage from rough forming to final forming. By using a plurality of sub-rotating rolls having an outer circumferential shape and causing the sub-rotating rolls to act on the main rotating roll in the same way or approaching the main rotating roll sequentially from the first stage, a thick ring-shaped material is The gist of the present invention is a method of manufacturing a vehicle rim, which roll-forms a rim of a predetermined shape to a desired thickness by sandwiching it between rotating rolls and extruding it by pressing force.

Hereinafter, the method of the present invention will be explained in the order of steps with reference to the illustrated embodiments. 1 is a thick material made by bending a band-shaped plate into a ring shape and welding the butt ends;
Alternatively, it is made of cut pipe or extruded material. This material 1 is extruded by rotating rolls to form a rim. An example of this is shown in FIG. 2, which includes a main rotating roll 2 and a plurality of subordinate rotating rolls 3 arranged around it. It is done using. The main rotating roll 2 is divided into two parts at a vertical plane H in the center, and one (for example, 2a) or both (2a, 2b) slides in the axial direction by hydraulic operation, etc., and when they come into close contact with each other on the H plane, A mold groove 4 for molding is formed on the outer peripheral surface. On the other hand, all of the sub-rotating rolls 3 are movably arranged to approach and depart from the main rotating roll 2, and have different outer periphery shapes. That is, each of the secondary rotating rolls 3 is a roll for each stage from the composition shape to the final forming, and the rim is roll-formed by these rolls acting simultaneously or sequentially from the first stage in close proximity to the main rotating roll. It is set so that

To form a rim using the ring-shaped material 1, the material 1 is fitted along the mold groove 4 of the main rotating roll 2, and then the material 1 is pressed and rotated by the sub-rotating roll 3. Shape by extruding.
At this time, the pressing force F of the subordinate rotating roll 3 is applied to the material 1.
(In some cases, a force F' is applied in the axial direction of the main rotating roll 2 to press both edges of the material to facilitate roll forming.) The material is added at the same time or sequentially as shown in FIG. be done. In addition, by the action of the sub-rotating roll 3, it is formed into a desired thickness.

According to the present invention described above, in the rim roll forming method, a thick material is used and is pushed outward by the pressing force of a rotating roll to form a rim of a predetermined shape to a desired thickness. Even if the cross-sectional shape of the rim has a protruding part, it can be molded easily and reliably, and it is an exceptional method that cannot be expected from conventional methods of molding thin materials, such as producing a strong rim. It has the effect of

In addition, the present invention enables roll forming by disposing a plurality of sub-rotating rolls around a main rotating roll and moving the sub-rotating rolls toward and away from each other simultaneously or in a step-by-step manner. Compared to roll forming, the efficiency of forming operations can be significantly improved.

[Brief explanation of the drawing]

Figures 1A to 3E are explanatory diagrams showing the rim manufacturing process in cross-section according to the method of the present invention, Figure 2 is a layout diagram of rotating rolls used in the method of the present invention, and Figure 3 is a cross-section of the main parts showing the forming state. It is a diagram. 1...Material, 2...Main rotating roll, 3...Subrotating roll, 4...Mold groove, 4a...Deep groove portion.

Claims (1)

[Claims] 1 Using a main rotating roll and a number of subordinate rotating rolls that are disposed so as to be approachable and detachable around the main rotating roll and have outer circumferential shapes for each stage from rough forming to final forming, By causing the rotating rolls to act on the main rotating roll at the same time or approaching the main rotating roll in order from the first stage, a thick ring-shaped material is sandwiched between the main and secondary rotating rolls and pushed out by the pressing force. A method for manufacturing a vehicle rim, which comprises roll-forming a rim of a predetermined shape to a required thickness.