In the car manufacturing process, the use of cast iron made of rough parts, accounting for about 60% of the weight of the vehicle, such as the cylinder block, the transmission box, steering gear housing, rear axle housing, brake drum, a variety of stents Wait. Cast iron parts are usually made of sand. Sand-based materials to sand-based, and with binders, water and other mix.

Frosting is the molten metal poured into the mold cavity, after cooling and solidified to obtain the production method of the product. In the manufacture of sand, it is necessary to consider how the upper and lower flasks can be separated in order to remove the wood mold, but also to consider the hot metal flowing in from where and how to fill the cavity in order to obtain high quality castings. After the sand is made, it can be poured, that is, the molten iron is poured into the sand mold cavity. Pouring, the hot metal temperature at 250-350 degrees, melting temperature higher. And then go through the sand, repair, grinding and other processes, to be able to become a qualified castings.