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With the help of major national special projects, promote the technological progress of my country's bearing industry

by:JNSN     2021-11-07

Luoyang LYC Bearing Co., Ltd. undertakes the subject of 'large-scale special bearingsResearched. It has achieved breakthroughs in key technologies such as bearing product design theory, bearing material selection and heat treatment technology, key parts processing technology and bearing test technology. Through the implementation of the subject, not only the company's technological innovation capability and overall technical level have been improved, but also the technological progress of my country's bearing industry has been promoted.

Comparison with international advanced technology before and after completion of the project

Before the development of this project, the high-precision machine tool spindle bearings produced by famous foreign bearing companies SKF and FAG (INA) were at the world’s leading level. Widely used in my country's machine tool industry, especially large-scale special bearings, they are in a monopoly position, which severely restricts the rapid development of domestically produced CNC machine tools. Through the implementation of this project, Luoyang LYC Bearing Co., Ltd., Luoyang Shaft Research Technology Co., Ltd., Henan University of Science and Technology, China Machinery Productivity Promotion Center, China First Heavy Machinery Co., Ltd. (hereinafter referred to as 'Yizhong') and Qinghai Huading Heavy Machine Tool Co., Ltd. (hereinafter referred to as 'Qinghai Huading') has made breakthroughs in bearing design, performance analysis, precision manufacturing, heat treatment and application, and achieved a 400t horizontal lathe HT420×180-400-NC, 160t The successful matching of bearings for key parts of machine tools such as horizontal lathe CK61450×15/160 and CNC double-column vertical lathe CKX52125×55/400 meets the design requirements of machine tool processing accuracy. After about a year of trial, the machining accuracy of the machine tool has been maintained well, confirming that the various indexes of the bearing meet the requirements of use, the accuracy is stable, and it has reached the international advanced level. The table shows the comparison between the key technical indicators of the developed bearings and foreign technologies.

It can be seen that the key indicators of the bearings developed in this project have reached or even partially exceeded the UP level (the highest level of foreign machine tool bearings) accuracy requirements of SKF and FAG. Not only that, the research unit of this subject also extended the size range and formulated a national standard. This standard not only represents the highest level in China, but also represents the international advanced level.

Product application

The products of this project have been successfully used in OEMs such as First Heavy Industry, Wuhan Heavy Machine Tool Group Co., Ltd. and Qinghai Huading. Among them, bearings NNU49/1250K/SP W33, NN30/750K/SP W33, NN3092K/SP W33, 811/1060M/P4 and 812/630M/P4 have been installed on a 400t horizontal lathe (HT420×180-400 -NC), mainly used for processing nuclear power million-kilowatt low-pressure rotors and support rolls of wide and thick plate mills above 4.7m. After processing, the roundness reaches 0.02mm and the cylindricity is 0.025/1000mm. After a year of trial, the accuracy is maintained and the machine runs smoothly.

The bearing NN30/560K/P2 W33 has been installed on the CNC double-column vertical lathe CKX52125×55/400 of Wuhan Heavy Machine Tool Group Co., Ltd. The workpiece is a large hydraulic turbine rotor with a diameter of 12m and a weight of 250t. , After processing, the roundness reaches 0.012mm and the cylindricity is 0.02/300mm. After a year of trial, it can still maintain the original processing accuracy and meet the requirements of use.

The bearing 71952AC/P4 has been installed on the precision coordinate milling and boring machine of Xi'an Hongshan Mechanical and Electrical Equipment Co., Ltd. The various indexes of the bearing meet the requirements of the host, and the life span exceeds 8000h. In 2010, it provided 125 sets for it, and in 2011, it provided 137 sets for it, which promoted the development of localized CNC machine tools.

The bearing YRT395 has been installed on the C-axis of the milling head of the Beijing Aviation Precision Machinery Research Institute. It is used for the gantry boring and milling machine. After the test run, the bearing meets the requirements of the machine tool and is in good condition.

Social and economic benefits

Through the implementation of this topic, Luoyang LYC Bearing Co., Ltd. has obtained good economic benefits: the first batch of bearings matched with a 400t CNC horizontal lathe has realized With a sales income of 3.3 million yuan, the subsequent two 400t CNC horizontal lathe supporting projects, with a sales amount of 8.8 million yuan; the successful supporting of the 250t roll grinder of Shanghai Machine Tool Plant, achieved an output value of 12.1173 million yuan. Not only that, the company also provides bearings for precision coordinate milling and boring machines: In 2010, it provided 125 sets of Xi'an Hongshan Electromechanical Equipment Co., Ltd., with an additional output value of 63.5 million yuan; in 2011, it provided 137 sets with an additional output value of 67.5 million yuan. . At present, the one-weight 400t horizontal lathe HT420×180-400-NC successfully matched by Luoyang LYC Bearing Co., Ltd. has processed 4 support rollers of 4.7m and above and 2 rotors, with an output value of about 130 million yuan.

Through the implementation of this subject, Luoyang LYC Bearing Co., Ltd. has established a large-scale special bearing production base, introduced more than 20 advanced production equipment, and has an annual production capacity of 600 sets.

Through the implementation of this topic, Luoyang LYC Bearing Co., Ltd. has developed heavy-duty horizontal lathe headstock bearings, vertical lathe table bearings, floor-standing milling and boring machine spindle bearings, and gantry boring and milling machine milling head C-axis bearings , These bearings have the ability to replace foreign imports in terms of accuracy and precision retention, and they have been successfully matched, which has improved the independent research and development capabilities of the key functional components of my country's high-end CNC machine tools-bearings.

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