Stainless steel gear pump shaft wear is mainly due to friction between the ends of the shaft and the support needle roller wear, so that smaller shaft diameter. If it is slightly worn, the shaft can be enlarged by plating a hard chrome to make the shaft repaired. If the shaft wear serious, 45 steel or 40Cr steel should be re-manufactured, shaft rough rough, fine car, the bearing parts to be heat treated, the hardness of HRC60-65, and then grinding, the bearing surface roughness Ra with parts Greater than 0.32μm; shaft roundness and cylindrical tolerance of 0.005mm; with the gear with the H7 / h6, the surface roughness Ra should not exceed 0.63μm.
Stainless steel gear pump body surface wear is mainly suction section arc-shaped face. If there is slight wear, use whetstone grinding to deburring use. The pump body is made of cast iron casting blank, severe wear and tear should be replaced when the new pieces. Stainless steel gear pump end caps made of cast iron, wear phenomenon, the slight flat grinding on the flattening, wear more serious grind on a flat grinder. Grinding the end cap and the pump body with the connection plane contact should not be less than 85% flatness tolerance, the end face of the hole centerline vertical tolerance, the two ends of the parallelism allowance and the two axis hole centerline The parallel tolerance are O.Olmm. After grinding the surface roughness Ra should not exceed 1.25μm. If both ends of the gear in the pump are repaired by grinding, the width of the pump body should also be changed to the same size as the sharpened ends of the gear. Both sides of the re-machined pump body should meet the standard technical requirements.
Stainless steel gear pump parts repair, the needle roller bearings should be replaced. Needle on the needle is: the size of the needle roller diameter error should not exceed 0.003mm, the length tolerance of 0.1mm, and the shaft with the gap should be around O.Olmm; needle roller assembly according to the number of requirements filled bearing shell, Needle roller to be arranged parallel to each other.
Stainless steel gear pump after a certain wear and tear to conduct a good inspection and maintenance, in accordance with certain methods and principles of maintenance and repair, timely layout and settings.
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