Manual modelling of casting

Sand casting is divided into manual ( Core) And the machine model ( Core) 。 Manual refers to the molding and core making main work all done by hand; Machine model refers to the modelling work, mainly including sand filling and compaction, draw, or box made by molding machine, etc. Potow foundry workers gauge friends introduce the main methods: manual manual modeling because of its flexible operation, strong adaptability, simple process equipment, no molding equipment and other characteristics, widely used in sheet small batch production. But manual productivity is low, the intensity of labor is larger. The molding for simple shape, end for plane and is the largest section of the casting should adopt the whole molding. The whole mold modelling is simple, modelling the whole appearance in a sand box, won't appear the wrong box. Whole molding is suitable for the shape is simple, the largest cross section at the end of the castings, such as gear billet shell, bearing, hood, etc. ( FIG. 2) 。 Parting modelling when casting the largest cross section is not the end of the casting, to facilitate the modelling and stripping, shape should be divided into two and a half or a few parts, this model is called parting modelling. When the biggest cross section in the middle of the casting, casting should adopt two box molding ( Figure 3) , from the largest cross section disciplinary action in two parts ( With pin positioning) 。 Modelling look when placed in the upper and lower sand box respectively, the parting surface ( The joint surface between shape and appearance), And the parting surface ( Joint between the sand mould and sand mould surface) Location collocated. Two cases of parting modelling is widely used in production of shape more complex castings, such as water pipes, bushings, valve body has a hole of the casting.