Why do the upper and lower die holders use cast iron?

Cast iron can resist the high temperature and high pressure when making molds, and the use of cast iron can increase the durability and service life of molds.

In the working state, the slight deformation of the die frame will reduce the accuracy and service life of the die. Therefore, the rigidity of the die must be strictly evaluated. In order to avoid vibration during high-speed stamping, it is best to use cast iron as the material of the upper and lower die holders.

Cast iron is a general term for alloys mainly composed of iron, carbon and silicon. The carbon content of industrial cast iron is generally 2.5% ~ 3.5%. Carbon exists in cast iron mainly in the form of graphite, and sometimes in the form of cementite. Besides carbon, cast iron also contains 1% ~ 3% of silicon, and elements such as manganese, phosphorus and sulfur.