Surface Treatment Of Sanitary Valves

The surface treatment method of Sanitary Valve is as follows:
The knife marks and grinding marks left on the surface of stainless steel sanitary valves during processing are the center of stress concentration and the source of crack expansion. Therefore, after processing, the parts need to be surface strengthened and polished by benchwork to eliminate processing hazards. Some edges, sharp angles and orifices of sanitary butterfly valves are blunted and R-ized. Generally, the electro-processed surface will produce a metamorphic hardened layer of about 6-10μm, which is grayish white in color. The hardened layer is brittle and has residual stress. Before use, the hardened layer must be fully eliminated. The method is to polish the surface and grind it to remove the hardened layer.
During the electro-processing process, the sanitary valve will be magnetized accordingly, with a small magnetic force, and it is very easy to attract some small objects. Therefore, before assembly, the workpiece must be demagnetized and the surface must be cleaned with ethyl acetate. During the assembly process, first refer to the assembly drawing, find all the parts, then list the matching order of each part, list the matters that should be paid attention to, and then start to assemble the mold. Generally, the guide pillar and guide sleeve are installed first, then the mold frame and the male and female molds are installed, and then the gaps at various places, especially the gaps between the male and female molds, are adjusted. After the assembly is completed, the mold should be inspected.
The precision of slow wire cutting can reach ±0.003mm, and the roughness Ra=0.2μm. At the beginning of the processing of stainless steel sanitary valves, the condition of the machine tool should be checked first, and the deionization degree of water, water temperature, verticality of the wire, tension and other factors should be checked to ensure a good processing state. Wire cutting is processed on a whole piece of material, which destroys the original stress balance of stainless steel sanitary valves and easily causes stress concentration, especially at corners. Therefore, when R<0.2 (especially sharp corners), improvement suggestions should be made to the design department.
To deal with stress concentration during machining, you can use the principle of vector translation. Before finishing, leave a margin of about 1mm, pre-process the rough shape, and then stop heat treatment to release the machining stress before finishing to ensure thermal stability.