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 Coating effect on pressed life was almost unknown for spraying process, molding temperature and pressure type structure changed a lot. High melting point alloy casting hot cracking is the main issue, it is caused by molding surface thermal fatigue. Pressed repeatedly on the surface of heating and cooling means die steel surface repeated expansion and contraction, the higher the temperature of the casting alloy, the greater the expansion of the surface, when paint spray to the cavity surface, surface layer by the chilling contraction, exacerbated by the process of thermal fatigue.

Coating of another important factors affecting the service life of pressure type is the dynamic type of lubrication. All pressed with a plunger, the plunger lubrication is necessary, to prevent sticking. For lubrication, after casting out, when the plunger out of the dynamic type, outside the paint spray to rod end. Other commonly used method is to put the paint spray into the plunger in the paint in the rear of plunger, it depends on what kind of method on coatings. Core slider lubricant, also, because of the large surface area of the pellet heat peng bulge caused by the different working clearance is bigger also, so particularly easy to get stuck.