Chinese and foreign bearing manufacturers in key technology analysis

Chinese and foreign bearing manufacturers in key technology analysis

Bearing Manufacturing Key Technical Summary: "The Runner" EDM wire electrode cutting CNC machining of multiple sub-cut machining machine tool accessories category indexing technology major breakthrough shaft parts 4, CNC lathe source inverter KV1000 Tablet leveler application machine tool blade material and heat treatment CA Casting CAE SIEMENS SINAUT MD720-3- dedicated to S7-200 series PLC GP Mori Seiki exhibited batch processing based on multi-axis machines Multi RecurDyn generating tool path optimization settings for the mold industry in two new high-performance milling machining center CNC machine tool blade grinding problems highlighted in High Speed Milling - body dynamics simulation of how to select the type of EDM CNC machine tool servo motor fault repair noun comment Tool soft PLC control technology for oil pipe threading production line CNC lathes transformation of NC machine tools Mitsubishi basic functions long shank Boring instance key manufacturing technology lubricating the rolling bearing seal test study of modern simulation technology is widely used rapid development of computer technology application specific work practices Condition bearing load direction size lubrication rotation speed of environmental parameters bearing parameters entered into the computer through calculus may reach understanding bearing life eva luation bearing design is the combination of this test method significantly shorten the testing time before human trials to reduce funding bearings manufactured ..

With the extensive application of modern computer simulation technology and rapid development. The technology specific approach is to load an application conditions bearing direction, size, lubrication, rotational speed and environmental parameters, as well as bearing the main parameters entered into the computer at the same time, by calculation, to understand the life of the bearing may reach to eva luate bearing Are design combination. This test method can significantly shorten the test time, reduce manpower and testing money, you can not manufacture complete before the bearing, their application results known in advance, is a quick and hassle free test methods. Advanced industrial bearings company SKF, NTN Bearing in simulation technology to achieve the advanced level. .

Domestic and international trends

Currently, bearing test methods at home and abroad, there are four: First, friction and wear test, two test bench, three laboratories (Proving Ground) simulation test, four, the actual running test conditions. Foreign to the several test methods were used, but not the same application purpose, for example, developing a new product, the first friction and wear testing to be done. But if the form of friction and wear without much change, only the dimensions, Loaded conditions change, you only need to do bench, simulated or actual running test can be. Abroad for some key parts of new products (such as wheel bearings, etc.) is very rigorous examination, it must be approved by the actual running test, in order to be allowed to carry on supporting the use. Swedish SKF, Japan NTN Bearing recent simulation technology, can substitute bench, simulation or experimental, to shorten product design time and accelerate the progress of product development, but also from the actual operation of the gap. Now, China's bearing industry has carried out friction and wear tests, only one Luoyang Bearing Research Institute; bearing bench has been carried out, the Luoyang Bearing Research Institute, Shanghai Institute axis, Hangzhou Bearing Test Center and Wafangdian, Harbin, 20 Yu Jiaguo bearing business; expand simulations are Luoyang Bearing Research Institute, Hangzhou Bearing Test Center and Los axis, Xiang-axis and other enterprises. But to actually be tested, and only in supporting host companies presented bearing manufacturers only be required when this regard, such as railway passenger car wheel bearings and wheel bearings. In short, the domestic in undertaking simulation and actual operation test is not widespread, should be further expanded host range or actual operating range for the simulation experiment early on the agenda for adequate software and hardware ready. .

The main content and objectives

For simulation, you must first of some representative types of typical products or simulation test bench to find life with the carrier, as a function of operating conditions between then use this relationship, bearing design and experimental work carried out by computer , this is usually only for those vital products will perform tests. According to China's existing capacity, the next decade is the main objective of railway vehicles bearing, automotive wheel bearing and high speed grinder spindle bearings Experimental study simulation, and gradually have some simulation test conditions. Studies are as follows:

Lubrication technology Technology Overview

Rolling in motion due to the constant wear and tear resistance of the bearing failure, a different grease (oil), and lubrication of the bearing to reduce friction and wear different effects. Thus lubrication technology has become an important part of the bearing technology research. Someone grease (oil) referred to as "the fifth part of the bearing" (the other for the inner ring, outer ring, rolling elements, cage). .

Rolling resistance hindered rotation by the rolling friction, sliding friction and lubricant friction components. When the rolling body raceway occur when rolling friction; sliding friction occurs in the holder body rolling guide surface, rib cage and roller guide surface of the roller bearing on the child face and the ring wall. Lubricant friction by lubricant at the contact internal friction and lubricant mixing and extrusion of the composition. The total friction bearings, namely a rolling friction, sliding friction and lubricant friction sum is the impedance of the resistance movement of the bearing. Lubrication technology research task is to develop different grease (oil) and lubrication, making the bearing of least resistance, the longest life expectancy. .

Domestic and international trends

Japan's several major bearing company (Seiko, Japan, etc.) represents the direction of the bearing seal technology development. Seal them in the development of technology development and early history bearing device technology, in-depth research, the current sealing technology is more mature. Multi-lip seal lip from a single development, from contact seals developed a non-contact seals; From the product type, ball bearings, roller bearings are. Follow the international trend of development, but also has developed a ring of deep groove ball bearings, water pump bearings, railway (tapered roller) bearings, needle roller bearings and cylindrical roller bearings bearing categories, including deep groove ball bearing production the largest, most widespread application. According to the National Bureau of Technical Supervision recently sealed bearing on the quality of the test results of view, the problem of structural design large sealed bearings, seals ineffective, drain fat phenomenon is more serious, strong user response. After analysis, the main reason is that China's current ring design structure is irrational, with no inner seal groove, plus manufacturing accuracy is not high. Therefore, the future trend of China's bearing seal technology development are: deep groove ball bearings as the representative to carry out sealing technology trial to find the best structure and the best ring seal gap; to carry out sealing materials research, looking for wear resistance, aging resistance, high temperature and corrosion resistant materials, to improve the contact seal life, develop high temperature seals or work under hazardous atmospheric conditions laid technical foundation. .

The main content and objectives

According to the current poor quality of the seal bearing the status quo, the future main contents are: First, strengthen research trials, screening ring structure deep groove ball bearings and development of the corresponding bearing inner ring seal groove structure, were needed to the existing deep groove bearing seal replacement structure, strive to make such bearings seal performance to catch the late 1990s, the international advanced level of similar products in 2005; followed with the development of China's car industry, the development of high temperature suitable for long-term work at 120-1800C high temperature sealed bearings; third is represented by the development of railway vehicles bearing tapered, cylindrical roller bearings sealed the new structure. .

Noise reduction technology Technology Overview

Bearing noise is an important environmental pollution, an important indicator of the need to control the bearing industry, especially for home appliances, office machinery, instruments bearing noise limit is more prominent. The past decade, China's bearing industry in reducing bearing noise has done a lot of work, the bearing noise level has greatly improved, but compared with other countries, there is still a gap, users reflect prominent is the "different tone" problem , bearing one micro-channel is very good! Burst operation appears bearing an irregular sound, even screams. Many factors bearing noise, but also very complex and require from the overall design of the bearing, each bearing a part - inner, outer, cage, rolling elements and lubricants (fat) to analyze research, but also from the bearing every need Study to analyze aspects of the materials used in parts, machining process and the use of equipment engineering, process materials. This is the basic content of bearing noise technology involved. .

Development of domestic and international trends

The development of technology is endless, despite the advanced bearing company (NSK, SKF, etc.) bearing noise level has been very high, but still make further development, namely "mute" bearing development, China bearing product next ten Development trends in the technical aspects of noise are: First, solve the bearing of "different tone", the second is to lower the vibration level on a new level, namely the level of the late 1990s to catch up with the advanced industrial countries bearing the 20th Century. .

The main contents and objectives

In order to solve bearing "different tone" issues and so on down the vibration level to a new level, increasing the amplitude control limits on technical standards, therefore, the main research is to improve the roundness of the rolling surface and the raceway to solve the holder and guided between the rolling elements stability, while reducing grease (oil) of foreign particles of contact with the balance of affinity with the corresponding rolling surface. Requirements rolling elements and raceway roughness of control of 0.001μm; impurity particles of grease is not greater than 0.01μm; increase cage ball roundness, so runout accuracy between the cage and the rolling elements up to 0.01μm. .