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A preparation method of hot-press stress-hardened tubular parts of galvanized sheet

A technology for parts and galvanized sheets, applied in the field of preparation of hot-compressed stress-hardened tubular parts of galvanized sheets, can solve problems such as LMIE cracking, and achieve the effect of strong corrosion resistance

Active Publication Date: 2022-06-28
SD STEEL RIZHAO CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing hot-pressed stress-hardened tubular parts of galvanized sheet, which solves the problem of LMIE cracking during the forming process of galvanized sheet tubular parts, and improves the corrosion resistance of tubular hot-formed parts during service sex

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  • A preparation method of hot-press stress-hardened tubular parts of galvanized sheet

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation cases, and the specific implementation steps are as follows:

[0025] A method for preparing a hot-compression stress-hardened tubular part of a galvanized sheet is acid-rolled with a thickness of 1.5 mm (chemical composition C: 0.2%; Si: 0.25%; Mn: 1.2%; Cr: 0.25; B: 0.003%; Ti: 0.015%) After passing through the GI type hot-dip galvanizing production line, the galvanized content of the upper and lower surfaces of the steel strip is controlled by the air knife to obtain hot-formed steel with unequal thickness zinc layer (one side of the thin zinc layer: 45g / m2; one thick zinc layer Side: 90g / m2);

[0026] The initial tube blank is obtained from the hot-formed steel slit coil of unequal thickness galvanized layer, which ensures that the inner wall coating of the tube is thick and the outer wall coating is thin; the circumference d of the initial...

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Abstract

The invention discloses a method for preparing a hot-pressed stress-hardened tubular part of a galvanized sheet. The initial pipe is obtained by slitting and rolling the pipe, and the initial pipe is heated to a certain temperature and time to ensure that the initial pipe is completely austenitized; C: the heated initial pipe is transferred to the mold, and both ends are sealed and filled with a certain pressure P Compressed air; D: During the mold clamping process, the two ends of the closed pipe are under the action of the hydraulic drive device or the wedge of the mold to ensure the appropriate feeding amount L, and ensure that the inner coating of the pipe is always in a state of compressive stress along the pipe axis ; E: After forming, the mold maintains pressure to realize the rapid exchange of heat between the tubular sheet and the mold to realize quenching. The invention solves the problem of LMIE cracking during the forming process of the galvanized sheet tubular parts, and improves the corrosion resistance of the tubular thermoformed parts during service.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a preparation method of a galvanized sheet hot-compression stress-hardened tubular component. Background technique [0002] The light weight of the car effectively reduces the fuel consumption of the car and reduces the exhaust emission. Tubular parts with closed sections are widely used due to their better rigidity. The cold forming technology of pipe fittings mainly includes internal high pressure forming technology and low pressure upsetting forming technology; the hot forming technology of pipe fittings mainly includes hot air bulging forming and hot pier bulging forming technology. The materials used in the hot forming technology of hot-formed steel pipe fittings are cold-rolled hot-formed steel (bare plate). During the heating process of the bare plate, a large amount of iron oxide scale will be produced. The inner and outer surfaces of the formed pipe fittings contain iron ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/20C21D9/08C21D1/18C21D8/10C22C38/02C22C38/04C22C38/38C22C38/32C22C38/28C22C38/26C22C38/24C22C38/22B21D26/033
CPCC23C2/06C23C2/20C21D9/08C21D9/085C21D1/18C21D8/105C22C38/02C22C38/04C22C38/38C22C38/32C22C38/28C22C38/26C22C38/24C22C38/22B21D26/033C21D2211/001
Inventor 刘培星郝亮侯晓英陈钢金光宇殷继丽曹光明任东展英姿高兴昌胡华东孙卫华汤化胜
Owner SD STEEL RIZHAO CO LTD
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