In the processing of stamped parts, the stretching process is also a commonly used treatment method. During the processing, the first thing encountered is the stamping direction of the stretched part. This aspect is extremely important as it not only directly affects the quality of the stretched part, but also influences some related parameters in the processing process.

The stamping direction of the stretch part should meet the following requirements:

Ensure that the punch can enter the die.

2. Try to make the contact area between the punch and the blank as large as possible, as this is the most beneficial for enhancing the deformation degree of the drawn part.

3. The resistance of material feeding in each part of the die should be kept uniform to ensure balanced force distribution. This is also a crucial guarantee for the quality of the stretched parts.

In the stamping part stretching forming process, there are two types: one-time stretching and multiple-time stretching. The characteristic of one-time stretching is that it is a single forming process, which can improve production efficiency. However, the disadvantage is that it is prone to not being completed properly, and the degree of change in each stretching process has certain requirements and cannot be too large.

Repeated stretching can increase the qualification rate of the products, reduce the occurrence of defective items, and eliminate the internal stress during the repeated stretching process through annealing and softening. Repeated stretching can ensure the accuracy of the workpiece, significantly improve the elongation coefficient and production efficiency. It can also make the stretching more uniform and reduce the defect rate of the workpiece.

One-time stretching and multiple stretching each have their advantages and disadvantages. When producing precision stamping parts, the choice can be made based on the characteristics of the product.