| At present, parameters of the internal structure | | | | The main problem is that the ripple is not |
| of China's sealed deep groove ball bearings are | | | | controlled. |
| almost the same as that of foreign products. | | | | As to the rings, most serious impacts on the |
| However, the level of vibration and noise of such | | | | bearing vibration are the channel waviness and |
| products is very different from that of foreign | | | | surface roughness. For example, if the circularity |
| products. It is mainly resulted from the | | | | of inside and outside channel of small and medium |
| manufacturing factors and working conditions. | | | | sized deep groove ball bearings is larger than |
| From the point of view of the bearing industry, | | | | 2μm, it will have distinctive effect on the |
| the working condition factors can be considered | | | | bearing vibration. |
| through making reasonable demands on the main | | | | The waviness is resulted from grinding as to the |
| engine. However, how to reduce vibration and | | | | steel balls and rings. Although superfinishing can |
| noise that are caused by the manufacturing is | | | | improve the waviness and decrease roughness, |
| become an urgent problem for the bearing | | | | the most fundamental measure is to reduce the |
| industry. | | | | grinding process of waviness and avoid random |
| Many tests from home and abroad show that: | | | | bump and hurt. |
| the processing quality of the cage, bearing ring, | | | | How to reduce noise of ball bearings? There are |
| and steel balls has different effect on the bearing | | | | two points which should be taken into |
| vibration. Among all of them, the processing | | | | consideration. One is the manufacturing process. |
| quality of steel balls has the most significant | | | | The refinement of the manufacturing process |
| effect on the bearing vibration. The main factors | | | | mainly refers to the shortness of the process and |
| that have influences are roundness of bearing | | | | the combination of the process and |
| rings, the waviness, surface roughness and | | | | manufacturing. The process of the manufacturing |
| surface bump and hurt. | | | | should be clean. Besides, bearings should be |
| The most prominent problem of China's steel ball | | | | produced in a large scale for this can improve the |
| products is that vibration value is large. The | | | | competitiveness in the world market. The other is |
| surface has serious defects (such as single point, | | | | the equipment. High-speed grinding, spindle |
| cluster points and pits). Even though the surface | | | | accuracy, stiffness and many other detection |
| roughness, size, shape and errors are not lower | | | | performances have much impact on the grinding |
| than the level of outside rings, the bearing | | | | accuracy and efficiency. |
| vibration value is very high after the combination. | | | | |