One of the forms of stamping die burst is the mold impact. The failure modes of die are mainly wear failure, deformation failure, failure and so on. However, due to the different process of stamping forming, different working conditions will affect the life of tungsten carbide die.

1. Stamping equipment

The precision and toughness of the press equipment (such as press) is very important for the impact of the die life. The higher the precision of the stamping equipment, the better the toughness, the higher the die life. Complex, for example, silicon steel sheet for Crl2MoV die material, used in ordinary open presses, average after grinding life is 1-30000 times, and used the new precision presses, die after grinding life of up to 6 ~ 120000 times. Especially small foot clearance or no clearance punching die, carbide die and precision punching die must choose high precision, good press rigidity, otherwise, will reduce the life of tungsten carbide die, serious damage to the mold.

2. Mold design

Precision of guide mechanism of mould. Accurate and reliable guidance, to reduce wear and tear of the mold parts, avoid has enormous influence on the convex and concave mold damage, especially no clearance blanking die, compound die, and small clearance and multistep progressive die are more effective. In order to improve the die life, it is necessary to select the guide 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 guiding mechanism should be higher than that of convex and concave modes.

3. Stamping process

(1) raw materials for stamping parts.

In practical production, because of external pressure parts raw material thickness tolerance error, material performance fluctuation, poor surface quality (such as rust) or not clean (such as oil), wear, easy to cause mould parts as well as the collapse edge. To this end, it should be noted that, as far as possible, the material with good stamping process is used to reduce the stamping deformation force. Before stamping, strictly check the number, thickness and surface quality of the raw materials, and clean the raw materials, and remove the surface oxides and rust when necessary; According to the stamping process and the type of raw materials, the softening and surface treatment can be arranged as necessary, and the appropriate lubricant and lubrication process should be selected.

(2) layout and edge.

The unreasonable reciprocating feeding method and too small edge value often result in sharp abrasion or convex and die damage. Therefore, considering to increase the material to finish at the same time, must according to the requirements of the parts processing and batch, quality and mould fit clearance, selecting reasonable layout method and the boundary value, in order to improve life for tungsten carbide die.

4. Mold materials

The influence of mould material on die life is a comprehensive reflection of material type, chemical composition, structure, hardness and metallurgical quality. Mold design of different materials is often different. Therefore, for the working parts of the die material puts forward two basic requirements: (1) the use of material performance should have high hardness and high strength, and high wear resistance and sufficient toughness, heat treatment deformation is small, has the certain red hardness; The process performance is good. The processing and manufacturing process of die working parts is generally complicated. Therefore, it is necessary to have adaptability to various processing technologies, such as malleability, machinability, hardenability, hardenability, quenching crack sensitivity and grinding process. According to the material characteristics, production batch and precision requirements of the stamping parts, the mould material with excellent performance is selected, and its technology and economy are also considered.

Posted by: hannahgwendolyn at 09:32 AM | No Comments | Add Comment
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