Grinding of the inner cylindrical surface removes the spray gun and replaces it with a grinder. The power of the grinder should be chosen to be about 2 kW and the rotational speed is 1440 r/min. Fix the appropriate weight on the other side of the sliding bearing to match The weight maintains a rough balance with the grinder. The grinder should use a cup-shaped grinding wheel so that the nut of the fixed grinding wheel does not extend beyond the end face of the grinding wheel and can be ground to the end of the cylinder. Strict inspection and correction must be performed before the grinding wheel is installed.
The operation of the grinding process is similar to spraying, that is, grinding axially from one side of the cylinder. After grinding the entire length of the arc, the sliding bearing is fed axially about a distance of the width of the grinding wheel, and then the grinding is reversed. cut. This is continued until the sliding bearing moves the end point, then the grinder is turned 180 degrees, and the remaining part is ground in the same way. During the whole grinding process, special attention should be paid to the following points: (1) At the same time as grinding, a special person must hold a water pipe to spray cooling water or special cooling liquid from the side where the grinding wheel is ground.
(2) Uniformly control the speed of feeding in the circumferential direction, especially when the back grinding (ie, the tangential direction of the grinding of the grinding wheel is opposite to the circumferential feeding direction), it is necessary to control the circumferential feed amount.
(3) After each grinding, the inner diameter of the cylinder is accurately measured to determine the depth of the next grinding until the required size and tolerance are achieved.
The method of grinding and repairing the compressor cylinder after the first thermal spraying has the advantages of simple process and equipment, easy operation, no need to move the cylinder (in situ processing), short repair time (generally no more than 15 hours), and low cost. The high precision is the repair of the pitting and the wear of the rotor seal line.
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