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Press-formed product

A technology for stamping and forming products, applied in the field of stamping and forming products, can solve problems such as defects and decline in yield, and achieve the effects of suppressing springback, improving fuel efficiency, and good flatness

Active Publication Date: 2014-11-05
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If springback occurs in a stamped product, defects will occur in the subsequent manufacturing process (such as welding process) and the yield will decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] The present invention will be described more specifically with reference to examples.

[0139] In this example, use image 3 The press forming apparatus 10 - 2 shown was used to verify the effect of press forming on the press formed product 20 of the present invention. The width of the punch 12 of the press forming apparatus 10 - 2 was 80 mm, the height was 60 mm, and the depth of the press forming apparatus 10 - 2 was 80 mm.

[0140] Figure 10 It is an explanatory diagram showing the cross-sectional shape of the main body 24 of the press-formed product 20 verified in this example.

[0141] The radius of curvature R1 of the part corresponding to the punch shoulder on the inner surface of the shoulder 24 c was set to 5 mm. The radius of curvature R2 of the flange part of the main body 24, which corresponds to the die shoulder, was set to 3.6 mm. The inner wall pitch L1 of the main body 24 was set to 80 mm, and the height H of the main body 24 was set to 50 mm.

[0...

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PUM

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Abstract

A press-formed product that enables inexpensively providing a shock-absorbing member having a high crashing load with respect to a three-point bending load is provided. The press-formed product is a press-formed product of a steel sheet 13, the press-formed product including a body 24 having a hat-shaped cross section and extending in a direction, the transverse cross section including a bottom portion 20a and a shoulder portion 20c that is contiguous to the bottom portion 20a through an R end 25. In the transverse cross section, a first region 27 from the R end 25 to a position a predetermined distance away in a direction in which the bottom portion 20a extends, and a second region 28 that is a part of the bottom portion 20a and is contiguous to the first region 27 have a work-hardening distribution introduced by press-forming of the body 24, the work-hardening distribution being one in which average hardness Hv1 of an area of the first region 27 from a surface of the steel sheet 13 to a position with a depth obtained by multiplying a thickness of the steel sheet 13 by 0.2 and average hardness Hv2 of an area of the second region 28 from the surface of the steel sheet 13 to the position obtained by multiplying the thickness of the steel sheet 13 by 0.2 satisfy a relationship of Hv1 > 1.05 x Hv2.

Description

technical field [0001] The present invention relates to a stamped product. Background technique [0002] High Tensile Strength Steel (High Tensile Strength Steel) is widely used as a material for structural parts of automobile bodies in order to improve fuel efficiency for preventing global warming and improve safety in car accidents. A high crushing load against a three-point bending load (Three-point Bending load) is required for a high-strength component such as a side sill, a side sill, or a bumper reinforcement among automotive body structural components. The above-mentioned strength member often has an elongated and complicated shape in order to prevent mutual interference with other members and ensure a space for disposing other members. [0003] The formability of the steel sheet decreases as the strength of the steel sheet increases. For example, when a high-tensile steel sheet is used in a slender press-formed product having a hat-shaped cross section (eg, a side...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/26B21D24/00
CPCB21D22/26B21D24/06B21D24/04B21D22/20Y10T428/1241B21D53/88B21K1/76B62D29/007
Inventor 中田匡浩铃木利哉德田友吉市川正信市丸信之
Owner NIPPON STEEL CORP
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