In the production preparation process of sand casting, it is necessary to develop a reasonable casting process plan and draw a casting process diagram. The casting process diagram is a graphical representation of the casting process plan with various process symbols in the part diagram, including the casting pouring position, mold parting surface, number of cores, shape, fixing method, and order of cores, as well as the remaining processing quantity, draft angle, shrinkage rate, gate system, riser, size and layout of cooling iron, etc. The casting process drawing is the basic process document to guide the design of the model (core box) ), production preparation, mold manufacturing, and casting inspection.