Springback Control Method of Variable Die Clearance in Stamping Forming of Ultra-High Strength Steel
A stamping forming and control method technology, which is applied in the field of stamping forming, can solve the problems of different degrees of deformation, inconsistent metal fluidity, and difficulty in guaranteeing the quality and accuracy of formed parts, and achieve the effect of good quality and high precision
Inactive Publication Date: 2011-12-28
JILIN UNIV
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Problems solved by technology
However, in industrial production, the forming of asymmetric hat-shaped stamping parts generally uses equal-gap forming dies with the same die gap. The springback size is also different everywhere, making it more difficult to guarantee the quality and accuracy of the formed parts
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[0011] The content of the present invention and its specific implementation will be described in detail below with reference to the examples shown in the accompanying drawings.
[0012] The asymmetric hat-shaped part shown in the drawings has one side wall at a certain angle with the vertical plane, one side side wall is vertical, and the rounded corners of the bottom end of the inclined wall are larger than the rounded corners of the bottom end of the straight wall. During the forming process, the sheet material on one side of the inclined wall is more likely to flow into the die. Therefore, under the same blank holder force, the plastic deformation degree of the sheet on the inclined wall side is smaller than that on the straight wall side, resulting in more serious springback after forming on the inclined wall side. In order to increase the degree of plastic deformation of the sheet on the inclined wall side, the mold gap B on the inclined wall side is designed to be smalle...
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The invention controls the springback of the stamping forming of an asymmetric hat-shaped part of ultra-high strength steel by setting unequal mold gaps at different positions on the mold, and belongs to the technical field of stamping forming. The invention provides a springback control method of variable die clearance for ultra-high-strength steel stamping forming. In the method, the forming die includes components such as a punch, a die, a hold-down plate, and a top plate. Set different mold gaps according to the cross-sectional shape of the formed part, and use a small mold gap to control the sheet material flow and plastic deformation during the forming process, so that the sheet material can be fully plastically deformed to reduce springback; Prevent the movement of the sheet metal in the horizontal direction, thereby improving the forming quality of the formed parts.
Description
Technical field: [0001] The invention is a variable die clearance springback control method for ultra-high-strength steel stamping and forming. By setting different sizes of die gaps at different positions of the die, the springback occurring during the stamping and forming of ultra-high-strength steel is controlled, which belongs to the stamping process. Forming technology field. Background technique: [0002] In recent years, with the rapid development of the automobile industry and the rise in oil prices, people have put forward higher requirements for the safety and low fuel consumption of automobiles. Ultra-high-strength steel sheet stampings are widely used in body-in-white due to their dual advantages of reducing weight and improving safety performance. However, as the strength and hardness of the steel plate increase, its formability also decreases, making the springback problem more prominent and the quality of the parts also greatly reduced. [0003] Asymmetric h...
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IPC IPC(8): B21D22/06B21D37/10
Inventor 谷诤巍吕萌萌沈永波卢睿徐虹李欣
Owner JILIN UNIV