Method of metal sheet press forming and skeletal part for vehicle produced thereby

A stamping forming and metal plate technology, which is applied to frame members for skeleton structure vehicles, known as the stamping field of drawing forming, can solve problems such as low cost and achieve the effects of low cost, improved forming limit and easy application.

Active Publication Date: 2009-09-02
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The present invention was made in order to solve the above-mentioned problems in the prior art, and its object is to provide a stamping method that does not require modification of the shape of metal molds for stamping such as punches and dies, or the need to change the blank into a special shape and Even when the shape of the member to be formed is complicated or the strength of the original metal plate is high, the forming limit of cracks in the metal plate can be increased, and it is also easy to apply to a large press forming machine , and low cost

Method used

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  • Method of metal sheet press forming and skeletal part for vehicle produced thereby
  • Method of metal sheet press forming and skeletal part for vehicle produced thereby
  • Method of metal sheet press forming and skeletal part for vehicle produced thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Forming tests were conducted by varying the surface roughness of punches, dies, and wrinkle-preventing platens and the kinematic viscosity of lubricants. Cylindrical cup forming was carried out using a cold-rolled steel sheet having a tensile strength of 440 MPa of the code B shown in Table 1 as a test material.

[0092] The punch 10 has a diameter φ of 33 mm and a shoulder radius of 3 mm. The shoulder radius of the die 20 is 5 mm. The evaluation of the forming limit in the cylindrical cup drawing forming uses LDR (Limited Drawing Ratio).

[0093] Table 1

[0094] Mechanical properties of the test material

[0095] label YP (MPa) TS(MPa) EL(%) Plate thickness (mm) A 151 280 48 1.2 B 323 470 32 1.2 C 630 1035 10 1.2

[0096] First, a forming test was carried out using a metal mold having a surface whose arithmetic mean roughness Ra was 1.0 μm, and using several types of lubricants with varying kinematic viscosities. In t...

Embodiment 2

[0100] Press forming was performed using two types of cold-rolled steel sheets B and C shown in Table 1. The test material B is a cold-rolled steel plate with a tensile strength of 440MPa, and the test material C is a cold-rolled steel plate with a tensile strength of 980MPa.

[0101] The object member is image 3 Shown is a front frame 60 as one of the frame members for the vehicle. Such as image 3 As shown, the front frame 60 is a member that functions to absorb energy (indicated as impact load input) 62 when the front of the vehicle collides. Therefore, it should be an important member having excellent energy absorption characteristics. image 3 Among them, 61 is a bumper.

[0102] The backing plate is spot-welded on the back of the drawn stamping product to make a closed-section structural member, and the compression failure test of the member is carried out. The test piece B1 is a member formed by using the test material B by a conventional forming method, and the te...

Embodiment 3

[0107] Three types of cold-rolled steel sheets shown in Table 1 were used to form cylindrical cups.

[0108] The test material A is a cold-rolled steel plate with a tensile strength (TS) of 270MPa, the test material B is a cold-rolled steel plate with a tensile strength (TS) of 440MPa, and the test material C is a cold-rolled steel plate with a tensile strength (TS) of 980MPa .

[0109] The punch 10 has a diameter φ of 33 mm and a shoulder radius of 3 mm. The shoulder radius of the die 20 is 5mm. The evaluation of the forming limit in the cylindrical cup drawing forming uses LDR (Limited Drawing Ratio).

[0110] Use a metal mold with an arithmetic mean roughness Ra of 1.0 μm on the surface, and apply a kinematic viscosity of 20mm 2 / sec anti-rust oil as a lubricant to carry out the cylindrical cup forming test. The three types of forming according to the present invention are conventional conventional forming methods, temporarily separating the punch from the blank during...

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Abstract

A press forming method for a metal sheet is provided. The method is capable of improving a forming limit at which a crack appears in a metal sheet and being easily applied to a large press machine for mass production with a low cost, without correcting the shape of dies, such as a punch and an upper die, or changing the shape or material of a blank to a special shape or material. Dies, a surface roughness of which is an arithmetical mean roughness Ra of 7.5 [mu]m or smaller, are used as a punch 10, an upper die 20, and a blank holder 30. Fluid with a kinematic viscosity of 500 mm<2>/s or lower(40 DEG C) is used as a lubricant, and is supplied to a space between a metal sheet 100 and the blank holder 30, a space between the metal sheet 100 and the punch 10, and a space between the metal sheet 100 and the upper die 20. A die is detached from a workpiece in the middle of forming, and resuming the forming, thereby improving formability.

Description

technical field [0001] Press forming refers to pressing a metal plate into a desired shape with a pair of dies (mostly metal dies) such as a punch and a die. The present invention relates to a press forming method of a metal plate when manufacturing vehicle components such as automobiles, etc., and specifically relates to a method that does not require special methods such as modifying the shape of a metal mold (grinding, etc.) or changing the metal plate to a special material The present invention relates to a press forming method of a metal sheet capable of increasing the forming limit of cracks in the metal sheet, and particularly relates to a press forming method called drawing forming. It also relates to a vehicle frame member for a frame structure manufactured using the press forming method, which uses a metal material having a tensile strength of 400 MPa or more as a raw material. Background technique [0002] Such as Figure 9A , Figure 9B As shown, stamping formi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/22B21D22/20B21D24/10
CPCB21D22/22B21D37/01B21D22/201B21D24/10B21D22/20B30B15/00
Inventor 玉井良清山崎雄司吉武明英
Owner JFE STEEL CORP
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