Stamping method for using high-strength steel plate to manufacture automobile rear bumper steel girder

A technology for high-strength steel plates and automobiles, applied in the field of stamping, to achieve the effects of reducing costs, improving utilization, and reducing manufacturing and debugging cycles

Active Publication Date: 2008-09-10
CHANGAN FORD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the disadvantages of using high-strength materials to make automobile rear bumper steel beams in the traditional cold stamping process, and prop

Method used

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  • Stamping method for using high-strength steel plate to manufacture automobile rear bumper steel girder
  • Stamping method for using high-strength steel plate to manufacture automobile rear bumper steel girder
  • Stamping method for using high-strength steel plate to manufacture automobile rear bumper steel girder

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Embodiment Construction

[0023] Select a low-alloy high-strength steel plate with a tensile strength greater than 590Mpa, such as B410LA in this example (C=<0.2%; Mn=<2%; P=<0.03%; S=<0.03%; Alt.0.02; Nb= <0.09%). Low-alloy high-strength steel is to add a small amount of niobium and / or titanium alloy elements to low-carbon steel to form carbides and nitrides with carbon, nitrogen and other elements and precipitate on ferrite to increase the strength of the steel.

[0024] figure 1 It is a schematic diagram of the rear bumper steel beam part of the car that needs to be made of high-strength plates. This part belongs to the safety performance part and plays an important role in the car body. As shown in the figure, the steel beam of the rear anti-collision beam is an integral member formed by an open drawn steel plate, with a total length of 1122 mm. Shape, on the right side of the beam body, there is a tow hook sleeve installation hole 5, the main positioning hole 6 and the process hole 7, and on the...

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Abstract

The invention proposes a punching method for adopting high intensity steel plates to manufacture the girder of the back bumper of a car. The invention adopts a cold punching shaping method which includes four steps of blanking and piercing, shaping and drawing, side rolling and hole flanging as well as punching; the punching technique is designed into the mode which is primary in shaping and secondary in drawing for avoiding the defects that the traditional drawing needs a large pressure-pad-force and a larger technique complementing surface and organically integrates the traditional single drawing with single shaping to lead the bumper to mainly obtain an approximate shape by shaping and needing no technique complementing surface during the shaping; thereby the conventional trimming die is reduced; the shape is solidified by the drawing at the chamfer angle positions of the part and a part of the side surface to reduce rebounding to ensure precision; thereby the operating factors of the part material is improved to the largest extent, the cost is reduced and the manufacture and debug periods of the die is decreased.

Description

【Technical field】 [0001] The invention belongs to the technical field of punching, and in particular relates to a punching method for manufacturing automobile rear bumper steel beams by using high-strength steel plates. 【Background technique】 [0002] The steel beam of the rear bumper of the car is one of the safety parts, which provides a strong guarantee for the safety of the fuel system at the rear of the car body when the car collides. Due to its high strength, its molding process and selection of raw materials are very critical. In foreign countries, OEMs generally use thermoforming materials and thermoforming processes to manufacture rear bumper steel beams. Thermoforming materials mainly contain alloying elements such as manganese and boron to enhance their hardenability. The strength of the thermoforming material is not high before heating. After heating, its strength decreases and its plasticity increases. It can form complex part shapes and stable part sizes. Whi...

Claims

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Application Information

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IPC IPC(8): B21D53/00B21D25/00B21D28/24B21D24/00
Inventor 邹文超王兵罗华刘勇王全义程小彪徐勇
Owner CHANGAN FORD AUTOMOBILE CO LTD
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