Method for manufacturing torsion beam and torsion beam

A manufacturing method and technology of torsion beams, which are applied in the manufacture of torsion beams and the field of torsion beams, can solve the problems of large pipe length restrictions, unfavorable productivity, cost, unfavorable production costs, etc., and achieve reduction of tensile residual stress and fatigue The effect of increasing strength

Active Publication Date: 2012-03-21
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, in the technology of Patent Document 1, it is necessary to make the rolling direction of the rolled steel plate substantially at right angles to the axial direction of the pipe body, and / or to make the inner periphery of the pipe body substantially at right angles to the axial direction of the pipe body. The direction of grinding is along the direction of the pipe circumference. Compared with the usual case, the limitation of the length of the pipe production is greater, or a grinding process is often added, so there are disadvantages in terms of productivity and cost.
In addition, in the technology of Patent Document 2, additional steps of twisting and heat treatment are required compared to the usual cases, and therefore, there are similarly disadvantageous problems in terms of productivity and cost.

Method used

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  • Method for manufacturing torsion beam and torsion beam
  • Method for manufacturing torsion beam and torsion beam
  • Method for manufacturing torsion beam and torsion beam

Examples

Experimental program
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Effect test

Embodiment 1

[0097] As embodiment 1, the tube body of the tube blank (the original form is a round tube) shown in Table 1 is placed on the figure 1 or figure 2 In the embodiment shown, torsion beams were manufactured by molding under different processing conditions as shown in Table 2, and the durability life (number of times) was studied by performing the same fatigue test (fatigue test) as above on the manufactured torsion beams. Table 2 shows the results. As can be seen from Table 2, the examples of the present invention exhibited extremely high durability life compared to the comparative examples, and also did not cause shape defects.

Embodiment 2

[0099] As Example 2, the tube body of the tube blank (the original form is a round tube) shown in Table 1 is subjected to different processing conditions as shown in Table 3 in any embodiment of the above-mentioned present invention (2) to (9). A torsion beam was fabricated by performing forming processing, and the same fatigue test as above was performed on the manufactured torsion beam to study the endurance life (number of times). Table 3-1 to Table 3-4 show the results.

[0100] From Table 3-1 to Table 3-4, it can be seen that the example of the present invention exhibited an extremely high durability life compared with the comparative example, and did not cause shape defects. In addition, the results of obtaining the above-mentioned γ by the above-mentioned measuring method are collectively described in Tables 3-1 to 3-4. In the example of the present invention, γ was suppressed to 50% or less.

[0101] [Table 1]

[0102]

[0103] [Table 2]

[0104]

[0105] [Ta...

Embodiment approach

[0116] Implementation column (N): Formed by (N) of the present invention, (N * ): In the present invention (N), molding is performed in such a manner that εa is outside the scope of the present invention

[0117] hydraulic bar -: No hydraulic load, (N): Combined hydraulic load in the present invention (N)

[0118] 1: Apply hydraulic pressure to the inside of the pipe from the state where the bend (bend straightening) with the bottom line as the inside of the bend is maintained until the load is removed

[0119] 2: In the stage from before the start of forming process to before unloading after bending and straightening (all stages of forming process), additional hydraulic pressure is added in the pipe

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Abstract

Provided is a means capable of improving the fatigue strength of an ear portion which is the fatigue high-risk portion of a torsion beam, causing minimal disadvantage in terms of productivity or costs. In particular, when shape-processing a tube (1) to be the torsion beam, a part of the tube (1) is crushed radially so as to have a nearly U-shaped cross section and thereafter bent with a bottom line (3) as the front side of bending, thereby imparting 2-6% pulling-side bending strain in the tube axis direction to the ear portion (2).

Description

technical field [0001] The present invention relates to a method for manufacturing a torsion beam and a torsion beam. Specifically, it relates to forming a torsion beam by forming a circular tube body into a substantially U-shaped or substantially V-shaped cross section. A manufacturing method of a torsion beam and a torsion beam manufactured by the manufacturing method. Background technique [0002] Patent Documents 1 and 2 can be cited as the background art related to the manufacturing method of the torsion beam. [0003] In Patent Document 1, a part of a pipe body manufactured by a general pipe manufacturing method (a pipe manufacturing method in which the rolling direction of a rolled steel plate is set to the tube axis direction) is pressed radially. When flattened to form a torsion beam, there may be an inner peripheral surface along the tube axis direction (length The wrinkle (wrinkle) extending in the direction) becomes the starting point (source) of fatigue crack ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D53/88B60G9/04
CPCB60G21/051B60G2206/80B60G2206/30B21D53/88B21D22/025B21D17/02B21D11/02B21D9/15Y10T29/49622B60G9/04
Inventor 桥本裕二丰田俊介中川欣哉铃木孝司河端良和园部治佐藤昭夫
Owner JFE STEEL CORP
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