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anti-corrosion treatment of Bearings

2019-07-17
NMN Bearing Co., Ltd. With the rapid development of the machinery industry, the application of slewing bearings is more and more extensive. The bearing is a new type of slewing bearing product newly developed by our company. It requires the finished product to have zero clearance or negative clearance. The rotary damping torque of the bearing is strictly regulated, and the precision of the finished product is very high. According to the requirements of the main machine, the bearing surface must be treated with anti-corrosion treatment. How to solve the above problems is the main subject of research.

1. Preparation of semi-finished products for inner and outer rings of bearings

In order to ensure the high appearance quality of the yaw bearing, the anti-corrosion spraying process is arranged after all the machining, and the bearing parts after the spraying are directly put into the warehouse after the assembly is completed, so as to ensure that the anti-corrosion layer is not scratched.

2, pre-cleaning

Degreasing treatment with organic solvents, oil stains may appear on the surface of the semi-finished bearing after machining. In order to ensure the quality of the spray, the cleaning process must be arranged before spraying.

3, workpiece pre-protection

Protection of the workpiece's arc raceways, threaded holes and surfaces that are not to be sprayed by special surface pre-protective tooling prior to blasting and spraying.

4, sandblasting

The surface of the inner and outer rings of the bearing is roughened to increase the contact surface between the coating and the workpiece, so that the surface of the workpiece is more activated and the bonding strength of the coating is improved.

5) Arc spraying

Arc spraying (pure aluminum or zinc) equipment mainly includes DC power supply, spray gun, air compressor and air filter, etc. It mainly controls parameters such as arc voltage, current, wire feeding speed, compressed air pressure and spraying distance.

Closed treatment

Since the coated coating has pores, it must be closed to increase corrosion resistance.

The main exposed surface of the yaw bearing after spraying and assembly has a gear surface, a mounting thread surface and a circular raceway surface. The first two are coated with anti-rust oil after assembly, the latter one is coated with lubricating grease during assembly, the inner packaging of the finished product is closed with a plastic film, and the outer layer is wrapped with a plastic braid to meet the anti-rust requirements.

Next: the cleaning of the NMN bearing

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