The one is pressure die casting process. Depending on the pressure applied, there are 2 types of pressure die casting processes: high pressure die casting and low pressure die casting. By utilizing aluminum pressure die casting process we can manufacture almost all the aluminum automotive parts as engine blocks, cylinder heads, pistons, connecting rods, transmission housings, wheel hubs, pump housings, carburetor housings, valve covers, steering gear housings, clutch housings, etc. Especially in recent decades, the application of aluminum castings in automotive industry is increasing steadily. According to statistics, the global output of aluminum castings increased more than 3% yearly, while 60% to 70% of these aluminum castings are applied in automotive industry. In these countries with developed automotive industry, the greater part of aluminum castings are for automotive use. Take Japan for instance, 76% of aluminum castings as well as 77% of die casting components are used in automotive industry.