What are the determination principles of casting time profiles?
The joint surface between the casting components is the parting surface. If the casting is composed of the upper and lower types, the upper and lower types are each a component. Selection principle of parting surface:1., all or part of the casting shall be in the same sand mold, or the main machined surface and the machined base surface shall be in the same sand mold, so as to prevent the wrong shape, guarantee the dimensional accuracy of the casting, and be convenient for molding and closing operations.
5., the number of cores and blocks should be reduced to simplify the process of molding, molding and blending.6. parting surface should be selected in the largest section of the casting, to ensure the removal from the appearance of the mold, and no damage to the mold. In order to ensure the quality of casting, it is necessary to avoid the sand mold after matching. In general, the casting position shall be determined first, and then the parting surface shall be considered. For the castings with low quality requirements, the parting surface that can simplify the process should be selected first, and the selection of the casting location shall be made. Be in a secondary position.
If the machined surface of the casting is very large and it is impossible to place the datum on the same side of the parting surface, the machined base surface shall be on the same side of the parting surface as most of the machined surface.2., the number of parting surfaces should be minimized, preferably with only one parting surface. This will simplify the operation process and improve the accuracy of casting (because of more than one parting surface, the casting will increase some errors)3., the cavity and the main core should be placed in the lower mold to facilitate molding, core, fit and test cavity size. But the lower mold cavity should not be too deep, and strive to avoid the use of hanging core and large suspended sand4., we should try to use flat face as parting surface, less surface, so as to simplify the molding and molding process.
