A processing method of a valve seat part

Abstract

The present invention relates to the field of processing valve seat parts, in particular to a processing method for valve seat parts, comprising the following steps: A, preparing multiple parts; B, component assembly and overall clamping: assembling multiple parts into a valve seat part, Use the clamping tooling to clamp the valve seat parts axially; C. Overall processing: use the machine tool to clamp the clamping tooling, and then process the valve seat parts on the machine tool; D. Surface treatment of the valve seat parts: The surface of the seat part is treated to make the surface roughness of the seat part meet the requirements. The proposal improves the processing quality of the valve seat parts.

Description

technical field [0001] The invention relates to the field of processing valve seat parts, in particular to a processing method for valve seat parts. Background technique [0002] With the increasing use of liquefied natural gas, my country has only begun to study the structure of LNG ultra-low temperature valves in recent years. However, the manufacturing process of low-temperature key materials and components is insufficient, especially non-metallic materials and composite components, whose quality and various processes cannot meet the requirements, which often makes the manufactured valves leak beyond the standard, have a short service life, and are difficult to meet relevant domestic and foreign standards. , such as: GB / T12237-2007, API598, BS6364, ISO15848-1 or -2, SHELL77 / 306 or 77 / 312 and other standards. Among them, one of the key factors affecting valve leakage is the degree of fit between the ball core and the valve seat parts, which means the degree of sealing bet...

AI Technical Summary

Problems solved by technology

For the processing of metal base material 316L stainless steel, there are process characteristics such as large cutting heat, large linear expansion coefficient, easy to produce plastic deformation under a certain clamping force, and cutting tools are prone to sticking and easy to wear; for polytrifluoroethylene valve seat The ring base material has the characteristics of small cutting force, poor thermal conductivity and heat resistance, large thermal expansion coefficient, and the expansion coefficient of plastic is 3-4 times that of metal, and the processing chips of the polytrifluoroethylene valve seat ring are in the form of ribbons and are easy to wrap around On the cutting tool, the processing chip, the cutting tool and the part itself are squeezed against each other, thus affecting the processing quality and size

Therefore, according to the characteristics of the above-mentioned materials and the processing method, it can be known that the individual parts need to be processed separately before assembly, so the machine tool's own accessories such as three-claw, four-claw, and self-made fan-shaped clamps or slotted jackets need to be used during the processing process. Clamp the corresponding three parts separately, so that the parts will be repeatedly or repeatedly clamped during the entire processing process, and the parts are prone to deformation under the action of the clamping force, resulting in dimensional accuracy, roughness and shape. The tolerance is difficult to control, and the quality of the machined surface of the part is not controlled, and the processing and manufacturing costs are high.

[0005] In addition, after the processing of a single part is completed, although for a single part, the corresponding accuracy, size and other requirements can be achieved after each processing, but when multiple parts are assembled, due to the existence of assembly errors, it is easy to cause the final assembly The dimensional accuracy and shape tolerance of the entire valve seat parts cannot meet the overall requirements of the valve seat parts, and the judgment standard for whether the final valve seat parts meet the requirements is for the valve seat parts as a whole, not for As far as each part is concerned, the quality of the valve seat parts processed by the above method is difficult to meet the relevant requirements

Images