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Luoyang VSG Bearing Co., Ltd is a China bearing manuracturers. As A China bearing manufacturers, we has passed ISO9001:2000 system since 2004. What's more, we are member of CBIA and syndic of RTA Magazine.
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Luoyang VSG Bearing Co., Ltd is one of the most professional China bearing manufacturers, we not only produce standard bearing, but also we could offer OEM project.
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Blog, powertrain abnormal sound |
10-25 |
Discrimination power, transmission line fault causes abnormal soundCar work sound vibrations of the system referred to as the sound of cars, many failures are manifested through abnormal noise, abnormal sound is phenomenal, the fault is the essence. If not timely troubleshooting can easily cause significant mechanical accident.Automotive common abnormal sound can be divided into powertrain abnormal sound, abnormal sound transmission system, driving system abnormal sound, drag abnormal noise and other categories.1, powertrain abnormal soundFailure occurred mainly in the engine and its related components, abnormal noise with the engine speed and change, and the frequency is higher.a. Off-cylinder engine misfire.b. Decrease the efficiency of the engine lubrication system caused by excessive friction parts.c. Belts, bearing wear abnormal sound.2, abnormal sound transmission system
Driveline abnormal noise often comes from gearbox, differential, clutch and other components with abnormal sound gear and clutch showing a significant change in status change.
3, the driving system abnormal sound
Department of abnormal noise and driving car driving status (speed, steering) are directly related.
4, the drag noiseVehicle reaches a fixed value abnormal sound obvious, speed decreases abnormal sound disappears. Mentioned here non-normal drag caused abnormal sound. Such abnormal noise caused by the flow separation around the body pressure changes generated noise. Specifically including cavity resonance, noise catheter tube and the antenna, wiper, mirrors and other accessories vibrations caused spoiler. Seal open, plastic parts can cause rupture of the exterior curve changes caused by traveling to the high speed air spoiler form abnormal sound.
Domestic bearing industry status quo |
06-18 |
China's bearing industry has formed the larger economies of scale, the global bearing industry currently accounts for 10.00% of the total market, in 2011 industry-wide production of 18 billion sets of bearings, sales of 1,420.00 billion yuan, ranking third in the world.In recent years, with the economy booming, China's bearing industry independent innovation capability and supporting capacity of the national economy greatly enhanced china bearing manufacturer has been able to produce more than 70,000 specifications of the various types of bearings, basically meet the needs of the national economy and national defense construction. matching requirements.International Bearing main producing countries and regions as China, Germany, Sweden, Japan, ten years ago, has formed eight multinational companies dominate the pattern, its market share of 80.00% or more, with the more obvious technical advantages.But with the world bearing industry powerhouse, China's bearing industry, there are still some gaps, mainly for high-precision, high-tech and low proportion of high value-added products, product stability and other aspects need to be further improved.Bearings are machine parts, bearings industry is technology-intensive, capital-intensive and labor-intensive industries mutually compatible. As low barriers to entry, the lack of exit mechanism, a large number of small business enterprises makes Chinese bearing industry concentration is low, and pour directly caused by the Chinese bearing the fierce market competition.Meanwhile, the world's eight major bearing companies have set up factories in China and access to domestic sales channels, making the Chinese bearing market competition is more intense, a new round of world economic structure adjustment of China's bearing industry provides a new opportunity for development, industry size Enterprises will use its own scale, management strengths, brand, product quality advantages, into the bearing manufacturing high-end and core technology, to further consolidate and expand its market share, industry concentration will increase. And strive to take the initiative in the international division of labor status and greater market share.
China's bearing industry technical standards |
06-18 |
At present, china bearing manufacturer enterprises through the introduction of advanced technology and equipment, as well as through its own research and development, the industry overall technological level has been greatly improved, including the issuer, including part of the process equipment manufacturing enterprises has reached the international advanced level. Currently representing the world's advanced level of salt quenching heat treatment production line only includes a small number of companies, including the issuer can grasp.China's bearing industry, the advantages of the sixteen key R & D in the field of thirteen areas of 106 kinds of major technical equipment supporting bearing 528 kinds of products reached the level of similar foreign products.But China's bearing industry big but not strong, bearing manufacturing process and equipment technology development is slow, CNC lathe low level of automation, many technical problems research failed to achieve a breakthrough, new steel bearing steel research and development, improve the quality of steel, lubrication, cooling , cleaning and abrasives, and other related technology research and development, still can not meet the standards and improve the quality of products bearing requirements, affect the bearing accuracy, performance, life and reliability.
Cylindrical roller bearing outer ring raceway spalling reason |
02-18 |
1 Introduction roll bearings under certain conditions of use, often because of the intrinsic or extrinsic factors, did not meet early damage in its lifetime. Analysis Rolling early injury, wherein the bearing outer ring raceway spalling is one important factor. In this paper, on the basis of previous test results, cylindrical roller bearing outer ring raceway spalling reasons were analyzed, and made a corresponding improvement measures.
2 previous test results analysis Visual inspection of the 2.1 macro analysis of the occurrence of the bearing outer ring raceway spalling spalling area are mostly distributed in the side of the raceway spalling region, the distribution of all roller cylindrical surface of many thermal oxidation discoloration dark brown stripe more serious, the rollers side of the raceway spalling at the corresponding oxidation discoloration, surface there are many indentation, roller side of the face wear abrasions, the other side of the end face near the outer diameter mild by the oxidation discoloration ring, light brown. 2.2 Chemical composition analysis to analyze the chemical composition of the outer ring of the bearing, the results table below: Table 1 Chemical composition /% C Mn Si Cr SP 1.02 0.36 0.30 1.55 0.013 0.004 2.3 Determination of hardness (HRC) hardness measurement results are shown in Table 2: Table 2 ferrule position jacket face (typing surface) end (non-typing surface) OD ID (raceway) with hardness values 61.8,62.8,62.3 of 62,62,62 60,60.4,60.4 60.2,60.2,60.1 The 2.4 material quality analysis Table 3 nonmetallic inclusions (level) microstructure (grade) the oxide sulfide punctate deformation sulfide with carbide liquation network carbide 1.5 2.0 0 1.5 0 1.5 currently, foreign bearing materials were powered by vacuum deoxidized steel, the oxygen content of the provisions of 15ppm or less, while only individual steel mills in China to meet this requirement, most other steel mills do not have the conditions, cause the roller material organization is greater than 4, crack more. In the analysis of the quality of materials, non-metallic inclusions and microstructure using YJZ84 standards to conduct a comparative analysis ferrule excessive impurity levels of sulfides. To detect peeling the outer ring, the peeling at the source, from the source 0.5mm ~ 1mm longitudinal polished metallographic specimens observed in the distance peeled surface 0.36mm-0.49mm within, there is a chain-brittle inclusions, these inclusions properties at the micro-earthquake pattern. Slightly away from the source at the same metallographic sample from the peel surface about 0.8mm at chain brittle inclusions. Polished metallographic specimens along the longitudinal stripping source at the source and its vicinity, observed in the same chain of brittle inclusions. Microcracks in the distance between the stripping surface 0.3mm at inclusions pitch the peeled surface 0.68mm place also exist about 0.56mm chain brittle inclusions. The above description of the raceway surface coat there are more chain brittle inclusions, some have more than specified in YJZ84 standards of qualified level. Stripped in stripping source organization under the surface for the fine crystalline microstructure of the outer ring, martensite and fine needle martensite + distribution of fine granular carbide strip + residual austenite and a small amount of points, needle troostite body. Peeling at the edges, the raceway surface although not falling off, but the existing parallel cracks under the surface, the raceway surface of the Organization for fine crystal martensite and fine needle martensite + fine granular carbide + retained austenite + a small amount of points, the acicular troostite. With the internal depth, non-martensite increased, but away from the surface of 3mm, non-martensite beyond the provisions of the qualified level. 2.5 the rings heat treatment quality analysis checks its outer ring bearing parts heat treatment quality inspection standards quenching, tempering organizations. Away from the surface of the depth / mm surface 1.0 2.0 3.0 organization level / grade 6 <7 <9 9 3
Conclusions from the macro organization, flaking bias in raceway aside, this is the main bearing in the course of the direction of the force partial, so that the roller and the raceway uneven contact bearing raceway overload load within a limited area, causing the bearing outer ring raceway early fatigue spalling. Therefore, during the installation process of rolling bearings, should avoid the inclination of the inner and outer tubes, so that the roller raceway uniform contact, avoid local overload, at the same time should be avoided in the process of using bearing, bearing tilt work. In addition, the force generated by partial reasons related to the strength of the bearing housing and the shaft, irrational, since the engagement between the difference in strength of the shaft support casing or or part rigid enough, causing the inclination of the axis of the jacket, so that stress is not distributed wet mechanical processing chip removal and coolant purification system in the country has just started, and also a lack of understanding of their most machining enterprise, the vast relevant experts in the rugged cylindrical wet machining system market prospects. To promote the use of the system, and will generate significant economic and social benefits, the market prospect is very broad. It is learned that the wet machining system in the foreign industrial countries has been widely adopted and proper way to solve a series of problems in the metal cutting process, and promote the development of production. Domestic stand-alone cooling lubrication centralized cooling and lubrication systems, only a small number of more advanced technology factory. According to the national plan, by 2010, China's automobile production reached 6,000,000, the need for a large engine plant technological innovation. To this end, the popularization and application of the the wet machining system is very necessary in some high-volume production machining factory and bearings, motorcycles, tractors and other industries. Can do more to promote China's machinery products into the international market, faster, generate income for the country foreign exchange, while reducing the import of such equipment. Mechanical engineer 5 Yaomu notice the modern mold technical Comprehensive Du Zhijun described process renewal Fenghua Wei Tang Xiaohui Zhonggao Yan Liu Feng Dong Zhaolin Ren Yubo Cong Juan white into Han Cheng He, Li Jun, Zhang You Xin Chi loud large-scale structure of the pressure vessel trends Lathe Tailstock automatically feed Boring short shaft hole straight blade the indexable scraping hob C616 modified lathe CNC with CNC lathe oil tubing thread AutoCAD drawing parts catalog group technology in CAD applications locomotive axle grinding online measurement system developed simple car Improvements to improve the structural strength of PTFE parts design and manufacturing of the brake drum boring machine design measures rolled three cases a pipe filter design improved sealing device to solve the the cylinder oil spill roller bearing outer raceway the entire width of, but concentrated in the side, to form a point contact, so causing spalling side. Therefore, in the design should ensure that the bearing housing and the shaft has sufficient strength and reasonable fit between the various parts, to ensure its rigidity. Found in the analysis of the quality of materials, outside raceway spalling source the chain outside the presence of more brittle inclusions and carbides banded, the presence of chain brittle inclusions destroyed the continuity of the matrix, is conducive to crack initiation carbide banded equally conducive to crack initiation. Non-metallic inclusions are visible, the inner raceway early flaking. Therefore, in the metallurgical quality of the bearing steel should be strictly controlled. In addition, carry out random checks on the oxygen content of the steel, some steel oxygen content as high as 35ppm, far beyond the required standards. Some steel has not taken any the deoxy measures, leading to severely affect the bearing life. Cope bearing raw materials strictly, select high-quality raw materials of steel. Ferrule heat treatment quality, in order to obtain martensite, must increase the heating temperature and fast oil quenching, which brings a range of issues in the heat treatment of stress concentration, for example, like the oil groove, typing, even surface collision, after the heat treatment will lead to stress cracking. Therefore, in order to prevent accumulation of stress before the heat treatment, in the turner step necessary to lay the foundation, such as a vehicle oil groove, chamfered to make the cutter holder Fengrui, typing to reduce Words, reduced depth. Strictly prevent the the car labor movement to move in bump hurt. The heat treatment process, as possible according to the different "wall" to adjust the heating temperature, the temperature control in the lower range, and sufficiently cooled. Organizational issues on heat treatment, according to the chemical composition of the steel, should determine the level of tolerance. In addition, a large area of peeling raceway may also be related to the depth of martensite, martensite depth more than 3mm, and thus how to reduce the amount of martensite within 3mm without causing quenching cracks will be the subject of future research.