Cnc processing Before the development of the machining rules for parts, the selection of the types of blanks before the parts are processed and their different manufacturing methods. Since the number of processes, material consumption, and processing labor of cnc workpieces are largely related to the selection of blanks, the correct selection of blanks has significant technical and economic significance.
Commonly used cnc workpiece blanks are: castings, forgings, profiles, welded parts, stampings, etc., and the same kind of blanks may have different manufacturing methods. The choice of blank should take into account the size of the production scale, which largely determines the economics of using a certain blank manufacturing method. If the production scale is large, the high-precision and high-productivity blank manufacturing method can be adopted, so that although the primary investment is higher, the cost of equally dividing into each blank is less. Moreover, since the productivity of the high precision blank manufacturing method is generally high, the raw material can be saved and the machining labor can be significantly reduced. Moreover, the high precision of the blank can simplify the process and process equipment and reduce the total cost of the product.
The cnc workpiece blank should be selected to take into account the shape and size of the workpiece. For example, blanks with complex shapes and thin walls are generally not castable in metal form; blanks with larger sizes are often not used for die forging, die casting and precision casting. For example, some small parts with special shapes are difficult to machine, and more sophisticated blank manufacturing methods, such as die casting and investment casting, are often used to minimize the amount of machining.
The selection of cnc machine blanks should take into account the mechanical properties of the parts. The same material uses different blank manufacturing methods, and its mechanical properties tend to be different. For example, a metal cast blank has a higher strength than a sand cast, a centrifugal cast and a pressure cast blank, and its strength is higher than that of a metal cast blank. Forgings with high strength requirements are often used, and ductile iron parts are sometimes used.
When selecting cnc machine blanks, the possibility and economy should be considered from the existing equipment and technical level of the factory. Consideration should also be given to the possibility of using new processes, new technologies and new materials such as precision casting, precision forging, cold rolling, cold extrusion, powder metallurgy and engineering plastics. With these blank manufacturing methods, the amount of machining can be greatly reduced, and sometimes machining can be stopped, and the economic effect is very remarkable.
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