How to select and inspect high quality valve blank
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Release Time：2018-09-25
Machining commonly used blanks are castings, forgings, profiles and weldments. Different types of blanks and the accuracy, roughness and hardness of the blank have a direct impact on the machining process. The selection of valve blank should consider the following elements:(1) the material of the parts and the organization and performance requirements of the material. The part material specified on the design drawing generally determines the type of blank. For example: the part material is cast iron, it must be used to make the blank by casting method. For steel parts, the mechanical properties of the material should be considered when selecting the blank. For example, the manufacture of high-pressure valve parts should generally choose forgings or weldments,
Machining commonly used blanks are castings, forgings, profiles and weldments. Different types of blanks and the accuracy, roughness and hardness of the blank have a direct impact on the machining process. The following elements should be considered when selecting a valve blank:
(1) The material of the part and the requirements for the organization and performance of the material. The part material specified on the design drawing generally determines the type of blank. For example: the part material is cast iron, it must be used to make the blank by casting method. For steel parts, the mechanical properties of the material should be considered when selecting the blank. For example, the manufacture of high-pressure valve parts should generally choose forgings or weldments to ensure that the material has good mechanical properties.
(2) The structural shape and external dimensions of the parts. The structural switch of the part is an important factor affecting the selection of the blank. For example, the valve body with complex structural switch can be cast. Large size of the valve body can choose sand casting; small size is the use of investment casting.
(3) the size of the production program. The larger the production program of the parts, the better the economic effect of the high-precision and high-efficiency blank manufacturing method.
(4) the conditions of blank manufacturing. Blanks should be selected according to the level of equipment and technology on site, and advanced blank manufacturing methods should be gradually adopted in consideration of development prospects.
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