Device and method for estimating spin forming limits of high-strength steel and tailor-welded blank

Abstract

The invention discloses a device for estimating spin forming limits of high-strength steel and a tailor-welded blank. The device comprises a spinning wheel and a die, wherein the die is a mandrel; the mandrel comprises an assembly part, an axle body part, and a molding part; the assembly part is arranged at the end part of one end of the mandrel; the axle body part is arranged at the middle part of the mandrel; the molding part is arranged at the end part of the other end of the mandrel; the axle body part is of a cylindrical shape; the molding part is of an ellipsoid shape; the section outer contour of the molding part along the axial direction comprises a linear section and two ellipse curve sections which are respectively connected with two ends of the linear section; and the two ellipse curve sections are symmetrically arranged around the center axis of the molding part as a symmetric shaft. In addition, a method for estimating by the estimating method is also disclosed by the invention at the same time. By adopting the estimating device and method disclosed by the invention, the high-strength steel and the tailor-welded blank can be subjected to spin forming limit estimation; and the estimation result is accurate and reliable, and has continuity.

Description

technical field [0001] The invention relates to a device and method for evaluating the forming limit of a metal sheet, in particular to a device and a method for evaluating the limit of spinning forming of a metal sheet. Background technique [0002] With the increasing demand for lightweight automobiles, the application of high-strength steel and tailor-welded blanks is becoming more and more extensive. At the same time, since the spinning process can obtain more significant processing strengthening effects, the use of spinning process to manufacture high-strength steel and tailor welded blank parts has become one of the important technologies for automobile lightweight. [0003] However, compared with traditional mild steel, high-strength steel has a lower formability while its strength is improved, and it is more prone to cracking than soft steel during spinning; Compression formability will also be significantly affected. Therefore, an evaluation method is needed to ev...

AI Technical Summary

Problems solved by technology

The cone die test is a relatively direct method for measuring mild steel, but this method is relatively primitive and rough, and has the following disadvantages:

[0013] a. Due to the relatively gentle deformation process, the obtained limit thinning rate is too large;

[0014] b. The process of directly obtaining the spinning forming limit by only one axial movement trajectory is too simple, and the material requirements are also high, and it is impossible to accurately evaluate the spinning forming limit of some materials, such as tailor-welded blanks, which are very likely Weld cracking occurred before the film was applied;

[0015] c. The deviation rate generated in the test has a great influence on the test results

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