Stamping die is the main process equipment for stamping processing, which is a more critical mold in industrial production. There are many factors that affect the service life of stamping die, stamping die failure is one, the form of wear failure, deformation failure, fracture failure and nibbling failure. Here we make a specific introduction to these, I hope you can understand, so as to make the corresponding improvement measures.

1, stamping equipment

Stamping equipment (such as presses) precision and rigidity of the impact of the die life is extremely important. Stamping equipment of high precision, good rigidity, die life greatly improved. For example: complex silicon steel sheet die material for Cr12MoV, in the ordinary open press on the use of the average resharpening life of 1-3 million times, while the new type of precision press on the use of the die resharpening life of up to 6 ~ 12 million times. Especially small gap or no gap die, carbide die and precision die must choose high precision, good rigidity of the press, otherwise, it will reduce the life of the mold, and in serious cases, it will also damage the tooling.

Stamping mold

2, stamping mold design

(1) The precision of the guide mechanism of the mold. Accurate and reliable guidance, for reducing the wear and tear of mold working parts, to avoid convex, concave mold nibbling has a great impact, especially no clearance and small clearance blanking die, composite mold and multi-position progressive die is more effective. In order to improve the life of the mold, according to the nature of the process and the precision of the parts and other requirements, the correct choice of guiding form and determine the accuracy of the guiding mechanism. In general, the precision of the guiding mechanism should be higher than the convex and concave mold with the tip.

(2) mold (convex, concave mold) edge geometric parameters. Convex, concave mold shape, fit clearance and fillet radius not only has a greater impact on the stamping parts forming, but also for the wear and tear of the mold and life also has a great impact. For example, the fit clearance of the die directly affects the quality of punched parts and the life of the die. Higher precision requirements, it is appropriate to choose a smaller gap value; on the contrary, it can be appropriate to increase the gap, in order to improve the life of the mold.

3, stamping process

(1) stamping parts of raw materials.

In actual production, due to the external pressure parts of the raw material thickness tolerance exceeds the poor, fluctuations in material properties, poor surface quality (such as rust) or not clean (such as oil), etc., will cause the mold working parts wear and tear, easy to collapse edge and other undesirable consequences.

For this reason, attention should be paid to:

① as far as possible, the use of good stamping process of raw materials, in order to reduce the stamping deformation force; ② before stamping should be strictly checked.

② stamping should be strictly checked before the grade of raw materials, thickness and surface quality, etc., and the raw materials will be wiped clean, if necessary, should be removed from the surface of oxides and rust; ③ according to the stamping process and the surface of the mold.

③ According to the stamping process and the type of raw materials, if necessary, can be arranged to soften the treatment and surface treatment, as well as the selection of suitable lubricants and lubrication process.

(2) Sampling and lapping.

Unreasonable reciprocating feed sample arrangement method as well as too small lap value will often cause sharp wear of the mold or convex and concave die nibbling. Therefore, in consideration of improving the use of materials, must be based on the parts of the processing batch, quality requirements and mold clearance, reasonable choice of sampling method and lap value, in order to improve the life of the mold.

4, stamping mold materials

Die material impact on die life is a comprehensive reflection of the type of material, chemical composition, organizational structure, hardness and metallurgical quality. Different materials of the mold life is often different.

For this reason, for the stamping die work parts materials put forward two basic requirements:

① material performance should have high hardness (58 ~ 64HRC) and high strength, and high wear resistance and sufficient toughness, heat treatment deformation is small, there is a certain degree of thermal hardness; ① material performance should have high hardness (58 ~ 64HRC) and high strength, and high wear resistance and sufficient toughness, heat treatment deformation is small, there is a certain degree of thermal hardness; ② process performance.

② good process performance. Mold work parts processing and manufacturing process is generally more complex. Therefore, it must have the adaptability to a variety of machining processes, such as malleability, machinability, hardenability, hardenability, quenching crack sensitivity and grinding processability. Usually according to the material characteristics of the stamping parts, production batch, precision requirements, etc., select the excellent performance of the mold materials, while taking into account the process and economy.