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1. The bearing ring is cold-expanded and expanded; China started from the principle research; successively obtained the national invention patent; it has entered the practical period. The skill level of the domestic cold-press machine is appropriate with the Japanese CRF type and the German UPWA type cold heading machine; There is a large distance in the stability, serialization, scale of application and degree of automation of the machine tool. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
2. At present, China's miniature, small and medium-sized bearing ring grinding super-fine grinding is still dominated by single machine; installation is mainly semi-active with single machine. Due to poor reliability of domestic equipment; online skills are not mature; it is difficult to arrange according to the line method Active production; this is one of the important reasons for incurring domestically produced bearings below the industrial development countries; it is gratifying to present the grinding, super-precision and installation of our own manufacturing lines. The production line is vigorously developed and applied as a breakthrough in improving production power, improving operating conditions and ensuring product quality; the degree of automation of bearing ring grinding super-fine grinding and bearing installation is very high.
3. The service life of tapered roller bearings in China is only suitable for 50-70% of industrial developed countries; one of the reasons is that the manufacturing precision of the circular rollers is low; the busbars have no convexity and the scale of the same group of tapered rollers is large; Roller appearance also has problems such as burn, decarburization and grinding of the metamorphic layer. Industrial developed countries use fine cam tapered rollers; and most of them are active lines.
4. In the fine steel ball manufacturing skills, China currently has the complete set of skills for manufacturing G5 steel balls; but it is not stable for mass production; G3 grinding skills are not developed; this situation is accompanied by the growing number of domestic and foreign shopping malls. The need for high-speed fine bearings is not used. Foreign countries such as Japan's AKS G3 can produce many Φ0. 05mm, Φ114. 3mm G3 steel balls; 70% of Japan's bearings are matched with AKS steel balls.
5, the processing and inspection of the cage is very thin; the existing problems are outstanding. For example, the wave cage; the domestic still follows the elliptical pocket; all use the single station press manufacturing. Foreign has been changed to a true circular pocket And widening the envelope surface; using multi-station (up to 15 stations) press manufacturing, about frame-shaped cage; domestic selection of one by one punching process; foreign for multi-head punching one-time process.
6. The development of modern high-speed fine mute machinery puts forward higher requirements for the processing and measurement accuracy of bearings; the public service level of bearing parts has entered the nanometer level from the micron level; then the corresponding processing and measurement of bearing parts is proposed. Demand. Nano-scale bearing processing and measurement skills have just started in China; some companies in the UK, such as the UK, have made great progress in the field of nano-skilled ultra-fine cutting and super-fine grinding. These other leading processing and testing skills are like custom grinding. Skills such as cutting skills, online measurement skills, fault diagnosis skills, simulation experiments, etc.; foreign countries have been widely used; domestic distance in this area is very large.
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The response of China's bearing profession to the process equipment
Source: China Bearing Network Time: 2018-03-19