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Wheel rim manufacturing method and automobile wheel rim manufacturing method

A manufacturing method and rim technology, applied in the direction of wheel manufacturing, wheels, rims, etc., can solve problems such as easy thinning of walls, and achieve the effect of good dimensional accuracy

Active Publication Date: 2016-11-09
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the opening edge of the rim 1a has a longer circumference than the groove 2, etc., it is easy to reduce the thickness in the rolling process.

Method used

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  • Wheel rim manufacturing method and automobile wheel rim manufacturing method
  • Wheel rim manufacturing method and automobile wheel rim manufacturing method
  • Wheel rim manufacturing method and automobile wheel rim manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0052] In the method for manufacturing a wheel rim for an automobile according to the first embodiment of the present invention, a pair of opening edges (hereinafter, sometimes referred to as "peripheral edge portions". figure 2 In the pair of ring-shaped parts represented by symbol 21), at least one of the thickening step S6 is thickened, the two opening edges of the rim raw material are enlarged in diameter S7, and the rim raw material is formed into a rim shape. A plurality of rolling steps S8 and an expanding step S9 for adjusting the diameter of the rim result in the completion of the rim.

[0053] As an example of the above-mentioned rim shape, the Figure 12 The same as the above-mentioned rim 1a described in , the shape including the groove 2, the wheel wells 3a, 3b, the boss 4, the bezel seating surfaces 5a, 5b, and the flanges 6a, 6b can be adopted.

[0054] The specific contents of the above-mentioned expanding step S7 and the above-mentioned rolling step S8 are no...

no. 2 Embodiment approach

[0096] Next, a method for manufacturing an automobile wheel rim according to a second embodiment of the present invention will be described. This embodiment corresponds to a modified example of the above-mentioned first embodiment, and the differences from the above-mentioned first embodiment will be mainly described, and the rest are the same as the above-mentioned first embodiment, and redundant description will be omitted.

[0097] In the present embodiment, for the heating temperature in the above-mentioned heating region 22, at Figure 5 A temperature gradient is added in the up-and-down direction (the axis direction of the rim material 20) of the paper.

[0098] That is, heating is performed by adding a temperature gradient as follows: in the heating region 22, the temperature at the front end edge of the opening that is in contact with the annular groove 11 and receives a compressive load first is the highest, and the temperature increases as the distance from the front...

Embodiment

[0111] In order to confirm the effect of the manufacturing method of the automobile wheel rim according to the first embodiment, the following confirmation based on the examples was performed.

[0112] That is, first, prepare a plurality of flat plates of high-strength steel (thickness is 2.36mm and 2.00mm, yield stress is 800N / mm 2 ), these flat plates are respectively bent into cylindrical shapes and the two ends are butt-welded to obtain two kinds of cylindrical rim raw materials (the radius of the respective outer peripheral surfaces is 170mm, and the width dimension parallel to the axial direction of the cylinder is 202mm ).

[0113] Next, the peripheral portion of each cylindrical rim raw material is thickened and expanded, and then formed into a rim shape by a rolling process.

[0114] In the thickening step S6 of thickening the peripheral part, after preheating the peripheral part to 700°C, use Figure 4A ~ Figure 4D The illustrated punching die 10a and support die 1...

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Abstract

This wheel rim manufacturing method comprises a molding step for molding a cylindrical rim material into a rim shape, and a thickening step for increasing the plate thickness of at least one opening edge of the rim material before and / or after the molding step. In the thickening step, a thick part is formed by applying a compression load in an axial direction of the rim material onto the opening edge in a state in which the opening edge has been inserted into an annular groove of a metallic mold, the annular groove being wider than the plate thickness of the opening edge.

Description

technical field [0001] The present invention relates to a method for manufacturing a wheel rim and a method for manufacturing a wheel rim for an automobile. This application claims priority based on Japanese Patent Application No. 2014-051431 for which it applied to Japan on March 14, 2014, and uses the content here. Background technique [0002] As an example of a wheel rim, the Figure 12 Indicates the wheel rim for automobiles. The automobile wheel 1 is composed of a substantially cylindrical rim 1a and a disk 1b fixed in the rim 1a. The rim 1a is formed including drops 2, wells 3a, 3b, ledges 4, bead seats 5a, 5b, flanges 6a, 6b, etc. rim shape. [0003] The manufacturing method of the rim 1a generally includes: the process of straightening the unrolled steel strip with a roller; the process of cutting the straightened steel strip to obtain a flat plate; the process of bending the obtained flat plate into a cylindrical shape; The two ends of the bent flat plate are b...

Claims

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Application Information

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IPC IPC(8): B21D53/30B21H1/04B21J5/08B60B21/00
CPCB21D53/30B21J5/08B21K1/38B21K21/12B60B21/00B21B21/00B21D19/00B21J9/08B60B3/04B60B2310/208
Inventor 忍田良之三日月丰
Owner NIPPON STEEL CORP
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