Analysis of Defective Problems of Stretching Parts in Precision Stamping Parts Processing Plant

Precision stamping parts processing plants often encounter various problems in the production of precision drawing parts, which greatly affects the production schedule and cost control. How do these problems arise? EMAR explains to you through a large number of practical proofs.

1. The influence of stretching depth

The distribution of the flow resistance of the tensile material along the concave die is directly related to the drawing depth. At the curved position of the inner concave and the outer convex, the excessive tensile depth of the tensile part can cause uneven distribution of the deformation resistance, which constitutes wrinkling, which should be prevented as much as possible.

2. Adjust the size of the blank holder force

When wrinkles occur evenly around the workpiece, it should be judged that there is a lack of pressing force, and wrinkles can be eliminated by gradually increasing the pressing force. When the tensile part stretches the conical part and the hemispherical part, most of the data is in a suspended state at the beginning of the stretching. Sidewall wrinkling easily occurs, so in addition to increasing the blank holder force, the precision stamping parts processing plant should also choose to add pick-up ribs to increase the inner diameter tensile stress of the plate and eliminate wrinkles.

3. The influence of the radius of the fillet of the die

The fillet radius of the drawing die die is too large, and the blank flows into the die through the fillet of the die, the smaller the tortuous resistance of the tortuous deformation. The smaller the tortuous resistance, the simpler the occurrence of wrinkling. The greater the tortuous resistance of the small tortuous deformation of the die radius, the less simple wrinkling, but it is easy to form cracking and pulling of the stretched part.

The main reason for the wrinkling of the stretched parts is the accumulation of materials during the stretching process and the excessive speed of local material movement. When formulating a solution, the precision stamping parts processing plant should consider adjusting the corresponding organization of the die from the above aspects, which will achieve good results.

This article is from EMAR Mold Co., Ltd. For more EMAR related information, please click: www.sjt-ic.com,