A method for eliminating wave deformation caused by progressive die stamping metal sheet

Abstract

The invention discloses a method for eliminating wave deformation of metal sheets stamped by progressive dies. The technical scheme mainly includes that the maximum gap Dmax between an arc chamfer section of a punch cross-section side of a punch of each progressive die and an arc chamfer section of a female die cavity cross-section side of a female die is set and is larger than a gap D between a straight section of the punch cross-section side and a straight section of the female die cavity cross-section side, so that internal stress which is generated in a metal sheet stamping procedure can be reduced. The method has the advantages that the method aims to overcome shortcomings in the prior art, the gap between the arc chamfer section of the punch cross-section side of each progressive die and the arc chamfer section of the female die cross-section side is enlarged, and accordingly the wave deformation of the metal sheets stamped by the progressive dies can be effectively eliminated by the aid of the method.

Description

【Technical field】 [0001] The invention relates to a cold stamping sheet technology, more specifically to a method for eliminating the wavy deformation of a metal sheet stamped by a progressive die. 【Background technique】 [0002] With the increasingly fierce market competition, various manufacturers have developed continuous stamping products of large and widened metal sheets to improve the production efficiency of the products and reduce the manufacturing costs of the products. [0003] Continuous stamping products of large and widened metal sheets are prone to wave deformation problems during the stamping production process, which will seriously affect the smooth progress of subsequent production processes. The wave problem is a technical problem plaguing the industry. [0004] Analysis of the cause of the waves, the first period of time after the new mold or the notch of the grinding die, the notch is in a relatively sharp state, and the stamped product will not produce ...

AI Technical Summary

Problems solved by technology

Tried to switch to high-viscosity stamping oil and found that the wave problem was slightly improved, but the expected goal was not achieved, and the frequency of mold chipping increased a lot. This solution is not feasible

[0010] 2. The process test of replacing the punch material with a more wear-resistant ceramic material: try to replace the commonly used cemented carbide material with a ceramic material. Because the ceramic material is a single crystal material, its wear-resistant life is about that of cemented carbide. 3 times, but the bending resistance and fracture toughness of ceramic materials are very low, and ceramic punches are prone to non-abrasive damage such as chipping and punch breakage

Therefore, if the ceramic punch is used in the mold, the risk is too high because it is easy to break and break, and this solution is not feasible.

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