2, mould parting surface refers to the contact surface between the sand box.The mold parting surface selection, should be on the premise of guarantee the quality of castings, as far as possible to simplify the process, save manpower material resources. For wear resistant castings, such as high manganese steel castings, the pouring position and parting surface selection, according to the production experience, mainly considering 3 points:(1) the use of high manganese steel castings and machining surface, should as far as possible under when pouring the casting or underside facade. (2) the important parts of the casting, to all or most in half with the mold. (3) the parting surface and parting surface, and for the same plane as much as possible. The above principles, sometimes contradictory, and therefore must grasp the principal contradiction, for the secondary contradictions, should begin from the technology measures to try to solve.Such as the casting high quality requirements, to meet the requirements of pouring position first, then consider the simplified molding process.Lost wax casting casting to has no special requirement, to simplify the casting process, improve the economic benefit as the main basis, without consideration of pouring position of casting.