In the stamping process of precision metal stamping parts, wrinkles sometimes appear and the workpiece is scrapped. What's the reason? Let's tell everyone from Ruishuo Hardware Editor!

The reason for the wrinkling of precision metal stamping parts is:

1. Too much lubricating oil or frequent brushing. Lubricant should be used, but not too much; and the brushing position is improper.

2. The blank holder force is not enough, and the blanking surface is not suitable for the problem of "loose inside and tight outside" Improper stamping direction of the workpiece.

3. The test blank is too soft, the material strength is low, and the blank size is too small to hold the material. The positioning of the blank is unstable, which leads to the partial pressure of the material, and the improper shape of the material pressing surface, resulting in uneven feeding.

The wrinkling phenomenon not only makes the workpiece scrapped, but also affects the cost of processing precision metal stamping parts and the waste of raw materials.

During the heat treatment process, precision stamping parts molds often deform. In order to prevent this bad phenomenon, as long as you grasp the law of deformation, analyze the causes, and use different methods to prevent mold deformation can reduce It is also controllable. Generally speaking, the following methods can be used to prevent heat treatment deformation of precision and complex molds.

(1) Precision stamping parts are selected according to fairness. For precision and complex molds, micro-deformed mold steels with good materials (such as air-quenched steel) should be selected, and mold steels with severe carbide segregation should be cast and processed reasonably, and solution double-refining heat treatment can be performed for large and uncast mold steels. .

(2) The mold structure design of precision stamping parts should be fair, the thickness should not be too large, and the shape should be symmetrical. For larger deformed molds, the deformation law should be grasped and the processing allowance should be reserved. For large, precision and complex molds, a combined structure can be used. .

(3) Pre-heat treatment is required for complex molds of precision stamping parts to eliminate residual stress generated during machining.

(4) Choose the heating temperature reasonably and control the heating speed. For precision and complex molds, slow heating, preheating and other balanced heating methods can be adopted to reduce the heat treatment deformation of the mold.

(5) Under the condition of ensuring the hardness of the mold, try to use pre-cooling, staged cooling quenching or warm quenching process.

(6) For precision and complex molds, if the premise permits, try to use vacuum heating quenching and cryogenic treatment after quenching.