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The use of metal self-correcting materials on bearings (1)
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Since the reform and opening up; the development of China's bearing industry has achieved remarkable results. Since 2000; according to the annual output of bearings; China has become the fourth largest international bearing output after Japan, the United States, Germany. Bearing annual output It has reached more than 2 billion sets; the annual output is about 24 billion yuan. The export volume accounts for more than 50% of the total output; the annual foreign exchange earns about 700 million US dollars. In recent years; China's bearing products in scale accuracy, rotation accuracy, oscillation noise, The number of life and reliability have also made significant progress. However, domestic bearings are compared with the products of foreign bearing producing countries; there is still a large distance in terms of type and quality. It is necessary to further add types and advance quality; It is necessary to work on the induction, production, data, test and smoothing of the bearing; the demand has a process of progress. The use of metal wear self-correction data on the domestic bearing advances the bearing reliability; reduces the bearing raceway and The coefficient of conflict between the rolling elements; greatly prolonging the service life of the bearing; making the general bearing to the new concept of "infinite life" A big step forward; have significant economic benefits.
First, the quality of the types of bearing products in China:
From 1997 to 1999; according to the "National Supervision and Inspection Product Catalogue" prepared by the State Bureau of Quality and Technical Supervision, the product quality inspection of the rolling bearing; the three-year uniform pass rate was 68%. The quality of the inspection product in 2000 was 6 higher than that in 1999. Percentage; proof of quality supervision and inspection management work has a significant role. Compared with developed countries in the bearing industry; the distance between domestically produced bearings in terms of type and quality is the most important:
1. There are few domestically produced bearings; the output is low. The bearing industry produces a total of 150,000 bearing types; the number of bearings produced in China is only 20,000; and most of them are general-purpose products. There are more than 2,000 domestic bearing companies; The sum of the output is listed after the international five major bearing companies (SKF, NSK, KOYO, NTN, NMB); thus; the size of China's bearing company. The stalls are swaying at night.
2, the domestic bearing scale accuracy public service dispersion is large. Although China's bearings in the scale of public service and rotation accuracy has made great progress; near the level of foreign brand-name products; but there is still a large gap in the scale error distance.
3. In terms of oscillation, noise and abnormal sound; the oscillating extreme value of China's bearings is higher than that of foreign famous brand products by more than 10dB. Taking 6202 bearing as an example; foreign famous brand products are about 26dB; sampling domestic products of 18 bearing companies; It is 37. 5dB.
4. The lifespan and reliability of domestic bearings are still low. Take the deep groove bearing as an example; the life of foreign famous brand products is usually more than 8 times the calculated life (up to 30 times); the reliability is up to 0. 98. Above, the life expectancy of domestic bearings is usually 3 to 5 times the calculated life; the reliability is about 0.96.
Because the domestic bearings have the above-mentioned distance in terms of type and quality; as a bearing producing country; China's increasingly developed home appliances, automobiles, textiles, machine tools and other occupations have to import many bearings every year. The imported bearing products are mainly low in household appliances. Noise and silent ball bearings, longevity number of automotive bearings, machine tool spindle bearings, high-speed railway passenger car and truck bearings, high-speed textile machinery bearings, etc. Imported 640 million sets in 1999; imported 930 million sets in 2000; imported 7 in 2001 200 million sets.
Because the life of the domestic bearing is short; the bearing can not be the same as the electromechanical equipment; the protection of the bearing is replaced; the utilization of the equipment is reduced and the repair cost is added. The failure due to the low bearing reliability is caused; Accident. The general bearing produced by the bearing industry in developed countries has begun to use the new concept of “infinite lifespanâ€; the special bearing also proposes the “synchronous life†of the supporting mainframe and the “zero failure†target requirement during the overhaul period. Domestic bearings must also continue to try their best to advance the product life and reliability.
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