The stamping die is the main process equipment for stamping processing, and it is a relatively critical die in industrial production. There are many factors that affect the service life of stamping dies, and the failure of stamping dies is one. Its main forms include wear failure, deformation failure, fracture failure, and gnawing failure. Below we will make a specific introduction to these, and hope that everyone can understand this, so as to make corresponding improvement measures.
1. Stamping equipment
The precision and rigidity of stamping equipment (such as presses) have an extremely important impact on the life of the die. The stamping equipment has high precision and good rigidity, and the life of the die is greatly improved. For example, the die material of a complex silicon steel sheet is Cr12MoV, used on ordinary open presses, the average regrinding life is 10,000-30,000 times, but used on new precision presses, the regrinding life of the die can reach 60,000-120,000 times. Especially for dies with small or no gaps, cemented carbide dies and precision dies, presses with high precision and good rigidity must be selected, otherwise, the life of the dies will be reduced, and in severe cases, the chess set will be damaged.
2. Stamping die design
(1) The precision of the guiding mechanism of the mold.
Accurate and reliable guidance has a great influence on reducing the wear of the working parts of the mold and avoiding damage to the convex and concave dies, especially the blanking dies with no gaps and small gaps, composite dies and multi-station progressive dies. In order to improve the life of the mold, it is necessary to correctly select the guiding form and determine the precision of the guiding mechanism according to the requirements of the process nature and the precision of the parts. In general, the precision of the guide mechanism should be higher than the matching tip of the convex and concave dies.
(2) The geometric parameters of the cutting edge of the mold (convex and concave molds).
The shape, fit clearance, and fillet radius of the convex and concave die not only to have a great influence on the forming of stamping parts but also have a great influence on the wear and life of the die. For example, the matching clearance of the mold directly affects the quality of the blanking parts and the life of the mold. If the precision requirement is high, a smaller gap value should be selected; otherwise, the gap can be appropriately increased to improve the life of the mold.
3. Stamping process
(1) Raw materials for stamping parts.
In actual production, due to the excessive tolerance of the raw material thickness of the external pressure parts, fluctuations in material properties, poor surface quality (such as rust) or uncleanness (such as oil stains), etc., it will cause increased wear of the working parts of the mold, easy chipping and other defects. as a result of.
(2) Layout and side-lapping.
An unreasonable reciprocating feeding layout method and too small an edge value often cause sharp wear of the mold or gnawing of the convex and concave molds. Therefore, while considering improving the utilization of materials, it is necessary to reasonably select the layout method and edge value according to the processing batch of parts, quality requirements, and mold fit clearance, so as to improve the life of the mold.
4. Stamping die material
The impact of mold material on mold life is a comprehensive reflection of material type, chemical composition, organizational structure, hardness, and metallurgical quality. The die life of different materials is often different.
The above are the four major factors that affect the failure of the stamping die. I hope it will be helpful to you.