Release Agent Spraying Standards for Wheel Casting Molds

Wheel aluminum alloy low-pressure casting molds have extremely high requirements for release agent spraying process, as the coating quality directly affects wheel surface finish, dimensional precision and demolding smoothness. Different from ordinary automotive molds, wheel molds have complex curved surfaces and high surface precision requirements, so strict spraying standards must be implemented in industrial production. In terms of coating thickness, too thin release agent film cannot form effective isolation, leading to mold adhesion and casting surface scratch; too thick film will cause residual ash and surface pits, affecting wheel appearance quality. The industry verified optimal thickness is 0.08-0.12mm, which can stably control adhesion defects below 0.5%. Spraying temperature is strictly controlled at 60-80℃, too low temperature leads to slow film forming and easy peeling, while too high temperature causes rapid agent volatilization and uneven coating. The spraying distance is fixed at 30-40cm with uniform moving speed to ensure full coverage of complex curved surfaces of wheels. The release agent concentration is adjusted to 18%-22% according to wheel casting process characteristics, which balances demolding effect and surface quality. In terms of spraying cycle, intermittent spraying every 8-10 production batches can timely compensate for the loss of release agent film caused by high-temperature scouring, effectively improving wheel casting surface qualification rate.