The ways to meet the process requirements of channel surface roughness are described from the aspects of equipment, abrasive and process method

Abstract: By analyzing the effect factors of surface roughness of bearing groove, the way of meeting process requirement of groove surface roughness was told, and was a great help to raising product quality.

Key words: groove; surface roughness; oilstone; support way

1 Preface

The surface roughness of the fine grinding groove of the bearing ring directly affects the bearing rotation accuracy and noise. There are many factors affecting the surface roughness of the bearing ring, but it is mainly closely related to the selection of equipment and oilstone. The analysis of the machining quality of bearing groove is an important subject in the bearing industry.

2 Effect of equipment on surface roughness of channel

(1) the accuracy of the equipment itself has a direct impact on the accuracy of product processing. For the channel surface accuracy, the processing results of different equipment make the products have different accuracy. At present, there are several kinds of groove finishing machines used by bearing enterprises: press roll finishing machine, electromagnetic chuck type finishing machine and roller type finishing machine. Several main forms have their own advantages and disadvantages. For example, the structure of the press roll type is complex, it is difficult to adjust, and the end face of the ferrule is easy to form the press roll trace; The electromagnetic chuck type fine lapping machine is easy to adjust, but it is easy to accumulate and cut tumors in the process of fine lapping; Due to the lack of axial positioning, the groove shape is easy to be damaged after fine grinding. However, these finishing machines are designed to improve the geometric accuracy and surface roughness of the bearing ring raceway. Under specific conditions, the bearing can obtain satisfactory results for users.

(2) the stability of the swing frequency of the oilstone clamp of the fine grinding machine has a direct impact on the improvement of the channel accuracy. The higher the swing frequency is, the higher the machining efficiency is. It is suitable for rough lapping, but the swing frequency should be appropriately reduced in the fine lapping stage The manufacturing accuracy and mutual assembly accuracy of the support device of the fine grinding machine and the swing device of the oilstone clamp are the necessary conditions for the surface roughness of the bearing channel to meet the process requirements.

3 Effect of abrasive on surface roughness of channel

(1) the precision of bearing fine grinding groove must be guaranteed by the quality of the previous process, and the quality of the previous process must meet the requirements of the process documents. Because the surface roughness of the grinding channel also affects the quality of the finishing process See the table below.

Influence of surface grinding Channel Roughness on finish grinding Channel Roughness

Therefore, grinding must be processed according to the process requirements Only in this way can the process requirements of the fine grinding process be ensured.

(2) the grinding wheel material and oilstone material used to grind the raceway have a direct impact on the surface roughness of the ferrule raceway. Therefore, in the actual work, there are not only the requirements for oilstone in the process, but also the experience in the use of oilstone and grinding wheel. The key to ensure the surface roughness of the channel is to select the oilstone with suitable material and particle. Abrasives are mainly divided into corundum and silicon carbide, and the surface roughness of the latter is much better than that of the former The hardness of the former also directly affects the surface roughness, W10 is the best, and W5 is the best.

(3) different oilstones with the same equipment and parameters will produce different roughness of the channel surface, with a difference of at least two small levels. Thus, the selection of oilstone occupies a key position in the final grinding of ferrule channel. During the test with the oilstone manufacturer, it is found that the selection of abrasive material and particle size is the key to reduce the surface roughness of the channel, because the smaller the particle size of the abrasive, the lower the surface roughness of the channel.

Through the test of 50 pieces of 6310/02 ferrules, WAW14 is used for coarse grinding and GCW5 is used for fine grinding. The surface roughness Ra value of the product channel reaches 0.08 μ m.

4 Influence of process method on channel surface roughness

In order to reduce the surface roughness of the channel, we must pay attention to the processing method and follow the process. This is different in machining bearing outer diameter and groove.

Taking the grinding process as an example, it will be found that in order to improve the surface roughness of the bearing ring, the precision grinder is selected to grind the bearing ring processing datum plane first, that is, the outer diameter or inner and outer diameter, to ensure the geometric accuracy of the ring groove grinding.

Therefore, in the actual processing, the processing of datum surface is very strict, which is the basic guarantee of channel processing.

5 Conclusion

Through the above analysis, it is required that the bearing manufacturer must follow the process route of bearing production in the actual processing, pay attention to the process requirements for the surface roughness of bearing groove processing and the equipment accuracy, and solve the above problems, so as to produce the bearing products satisfying the users.

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