During the grinding process of the full complement cylindrical roller bearing, the working surface is ground by a high-speed rotating grinding wheel. Therefore, if the operation and adjustment of the equipment are not carried out according to the operation instructions during grinding, the working surface of the bearing will appear on the working surface. Various defects, so as to affect the overall quality of the bearing. When the bearing is precision ground, due to the high roughness requirements, the grinding marks on the working surface can often be observed with the naked eye. The grinding marks on the surface are mainly as follows. The reason for the appearance of cross helix traces is mainly due to the poor straightness of the busbar of the grinding wheel and the existence of concavo-convex phenomenon. During grinding, the grinding wheel and the workpiece are only partially in contact. When the workpiece or grinding wheel moves back and forth several times, the The workpiece behavior reproduces the intersecting helix and is visible to the naked eye. The pitch of these helical lines is related to the speed of the workpiece table and the rotational speed of the workpiece, as well as the non-parallel relationship between the axis of the grinding wheel and the guide rail of the table. (1) The main reasons for the formation of the helix 1. The grinding wheel is not properly trimmed, the corners are not chamfered, and the coolant is not used for trimming; 2. The guide rail of the worktable is too much lubricating oil, causing the worktable to float; 3. The machine tool accuracy is not good ; 4. Grinding pressure is too large, etc. (2) There are reasons for the formation of the helix: 1. The rigidity of the V-shaped guide rail is not good. When grinding, the grinding wheel is offset, but the edge of the grinding wheel is in contact with the working surface; 3. The rigidity of the workpiece itself is poor; 4. There are broken and peeled off sand particles on the grinding wheel and iron filings under the grinding of the workpiece are accumulated on the surface of the grinding wheel. Rinse or brush clean the grinding wheel with cooling water; 5. The grinding wheel is not well dressed, and there are local protrusions. The main reasons for the rust are as follows: 1. In the process of producing bearings, some enterprises did not strictly follow the requirements of cleaning and anti-rust regulations and oil seal anti-rust packaging requirements to prevent rust of bearing parts during processing and assembled bearing products. deal with. For example, the turnover time of the ferrule is too long during the turnover process, and the outer circle of the outer ring is in contact with corrosive liquid or gas. 2. The quality of anti-rust lubricating oil, cleaning kerosene and other products used by some enterprises in production cannot meet the requirements of technological regulations. 3. As the price of bearing steel drops again and again, the material of bearing steel gradually declines. For example, the content of non-metallic impurities in the steel is high (the increase of the sulfur content in the steel reduces the corrosion resistance of the material itself), the deviation of the metallographic structure, etc. The source of bearing steel used by the production enterprises is more complex, and the quality of the steel is even more mixed. 4. The environmental conditions of some enterprises are poor, the content of harmful substances in the air is high, and the turnover site is too small, so it is difficult to carry out effective anti-rust treatment. Coupled with the hot weather, production workers violated anti-rust regulations and other phenomena. 5. The bearing packaging materials such as anti-rust paper, nylon paper (bags) and plastic cylinders of some enterprises do not meet the requirements of anti-rust packaging of rolling bearing oil seals, which is also one of the factors that cause rust. 6. The turning allowance and grinding allowance of the bearing rings of some enterprises are too small, and the oxide scale and decarburization layer on the outer circle cannot be completely removed, which is also one of the reasons.
One increasingly popular managerial tactic to improve problem-solving performance of CONTACT US is to increase the connectedness, or what academics call clustering, of the organization
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