Valve rough selection principle

This article collected some of the options selected valve blank should be considered technical parameters, for industry reference. The rough machining commonly used castings, forgings, profiles and welding parts. Different types of rough and rough precision, roughness and hardness on the machining process has a direct impact. Select the valve blank should consider the following factors: ⑴ parts of the material and the organization of materials and performance requirements: the provisions of the design drawings on the material, in essence, determines the type of rough. For example, parts made of cast iron must be cast to make the blank. For steel parts, the mechanical properties of the material should be taken into account when selecting the stock. For example, the manufacture of high-pressure valve parts generally should use forgings or welding parts, to ensure that the material has good mechanical properties. ⑵ parts of the structure and shape dimensions: the shape and shape of the parts affect the rough selection of an important factor, for example, the structure of complex valve body should use castings as far as possible. Large size of the valve body can choose sand casting; small size is the use of investment casting. ⑶ the size of the production program: the larger part of the production program, the use of high precision and high efficiency of the blank manufacturing method, the better economic results. ⑷ rough manufacturing conditions: the scene should be based on the status of the equipment and technology to choose the rough, and consider the prospects for the development of advanced rough production methods.

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