The foundry tutor teaches you how to select the casting blank
Precision casting is the general term for obtaining precision size castings. Compared with the traditional sand casting process, the casting size obtained by precision casting is more accurate and the surface finish is better. Precision casting manufacturers introduce it to include investment casting, ceramic mold casting, metal mold casting, pressure casting and lost foam casting. Precision casting is also called lost wax casting. Its products are complex and close to the shape required by the parts, and can be directly used without processing or less processing.
The technological characteristics and mechanical properties of part materials roughly determine the type of blank. For example, the billets of cast iron castings are ordinary steel bars with simple shapes and low requirements for mechanical properties. For important steel parts, in order to obtain good mechanical properties, forgings should be selected. When the shape is simple, steel castings should be used. The materials are complex and the mechanical properties are not high. The profiles or castings commonly used for non-ferrous metal parts can be used.
The blank of large and simple parts is mostly sand casting or free forging, and the rough structure with complex structure is mainly used for precision casting. The blank of small parts can be forging or pressure, and the blank of steel parts is mainly used for forging. If the diameter of the step is not large, it can be used on the rod. If the size of each step varies greatly, forging shall be used.
When determining the blank, we should combine the specific production conditions, such as the actual level and capacity of on-site production, the possibility of outsourcing, etc., otherwise it is unrealistic. In order to save materials and energy and improve processing efficiency, casting methods and materials such as precision casting, precision forging, cold rolling, cold extrusion, powder metallurgy, profiled steel and engineering plastics should be fully considered. In this way, even without machining, the amount of machining can be greatly reduced. The economic benefits are very significant.