The casting processing and production of precision casting out there will be some burrs are all we need to start work on the surface of the artificial to deal with, so we in automobi-le also to do well on the processing of the details of the last step is the key to quality.The precision casting were included the viscosity of inside and outside to remove the casting surface sand, the beatles seam on the top of the parting surface and core, burr, riser removal of trace.The methods are as follows:1, precision casting, manual cleaning:Suitable for single piece and small batch and complex shape parts;