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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>The effect of metal wear self-correcting skills on bearing life Effect of metal wear self-correcting skills on bearing life
The development of the equipment operation puts forward a higher need for the bearing induction skill level. The bearing life extension skill is still the main point of the current discussion. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The method of external reinforcement has become an effective way to complete the longevity of bearings in the national watch. The process has been carried out by the laser, electron beam, ion beam and other external skills developed in the modern era to explore the effect of nano-multifunctional mixed group data on bearings. The appearance of the work; the anti-rust, anti-corrosion, low coefficient of conflict; high hardness, high temperature resistance, wear resistance, impact resistance, etc.
Metal Wear Self-Correction Skill (hereinafter referred to as ART); able to reach the surface engineering skills with excellent induction function. It is a sub-micron powder, dynamic nano-scale effect mechanism. This intelligent self-correction with revolutionary appearance engineering category New skills will bring new key to the improvement of bearing life and reliability value; contribute to the inductive strength of promotion equipment.
1. Introduction to ART skills 1-1: ART skills are patented skills with independent intellectual property rights. ART skills are sub-micron ore powder compositions composed of hydroxysilicate messy components. Unremitting efforts; using China's mineral resources for technological innovation and progress.
0? 2002 China National Defense Patent 0? In February 2009, China National Patent 1-2: ART product ART skill set "reduction of grinding, anti-wear and in-situ self-correction" as one of the channel skills; "Beijing Weishi Alte New Skills Co., Ltd." has announced that the "Okmo" brand series of products has reached 19 items based on different conflict conditions.
Its modern ART powder preparation equipment and first-class experimental testing can not only satisfy the needs of the domestic market; its quality also surpasses similar products from abroad. It is the application effect of the verification products under practical working conditions; The Group's hot-rolled strip production line is used for the bearing life extension test of ART rolling mill. The coating “Ocmo†is used in the bearing conflict of the rolling mill; the production test of one year proves that the service life of the rolling mill bearing is more than doubled. See Figure 1; The 646290 bearing on the steel hot-rolled strip production line has been subjected to the failure of the rolling metallurgy.
MEF4A high-grade metallographic microscope was used for investigation; there was an ART-type cermet coating on the surface of the rollover conflict; the thickness was 0.006mm.
Elucidation of the effect of ART data on impact and conflict forces; ART powder quality is excellent; metal-like ceramic layer is evenly distributed and stable; it has reached the skill characteristics and skill indicators. This is different from the oil additives in the market.
The conflict between metal and metal is changed to the conflict between the cermet layer and the cermet layer. It will undoubtedly greatly improve the bearing life.
1-3: ART skills have been supported by the relevant national ministries and commissions. The development and application of this skill has been valued and supported by the relevant state ministries and commissions; on September 18, 2002, under the direct control of the former State Economic and Trade Commission, the National Defense Science and Technology Commission and the Ministry of Science and Technology The Ministry of Railways, the Ministry of Communications, the Ministry of Education and the State Environmental Protection Administration and other units; held a national-level judgment meeting on the "metal wear self-correcting data" product. It consists of 17 professors including Xu Binshi, Zhong Qunpeng, Ding Chuanxian and Zhang Fuze. Judging committee; unanimously agree that the project has been judged; its primary decision is:
The metal wear self-correcting data is a high-tech product with independent intellectual property rights; it has the world's advanced level. The successful development of metal wear self-correcting data has a broad application prospect; it can promote the research of the use of conflicts in foreign foreign engineering engineering.
Together, we can promote the promotion and transformation of China's traditional industries; it will have a serious impact on the development of China's national economy." "This high-tech product should be agile into productivity." The State Economic and Trade Commission classified the ART project into "2002." 2016 National Science and Technology Innovation Program."
State Councilor Wu Yi had personally investigated the timing of the project; the professor was discussing the project 1-4: ART skills:
.1) The primary feature of metal wear self-correcting data is the formation of wear-resistant ceramic coatings on the surface of metal conflicts.
.2), metal wear self-correction data is ultra-fine powder data under the normal operating conditions of the machine without the need to collapse the wear parts.
.3) Self-correcting data can be selected to compensate for external wear; the thickness of the wear-resistant ceramic layer is proportional to the amount of ultra-fine powder and the energy of the conflict release; it is actively conditioning.
.4), the wear-resistant ceramic layer has no significant interface with the original metal appearance.
.5), wear-resistant ceramic layer makes the coefficient of conflict smoother than the oil film by an order of magnitude.
.6), wear-resistant ceramic coating has outstanding anti-wear and anti-corrosion functions; only need to adhere to the shape of the layer to extend the life of the machine; no need to replace parts.
.7), wear-resistant ceramic layer can not only compensate the open space; make the parts recover the original shape; can also optimize the collaborative open space; this is beneficial to reduce mechanical oscillation; reduce noise; save energy.
Measure the thickness of the cermet layer formed on the inner wall of the cylinder. Scanning electron microscopy of the cermet layer of the 15th cylinder of the DF-11 locomotive 063 diesel engine running 150,000 km after the metal wear self-correcting data is applied. Observations; the results show that: in the cross section of the metallographic sample taken from the cylinder liner; the cermet layer of about 10 microns thickness is clearly visible under the scanning electron microscope under the optical microscope.
Scanning electron microscope image of the outer cover of the cylinder liner (backscattered electron image; metallographic preparation method; after corrosion)
1-5: ART skill indicators:
Wear-resistant ceramic coatings have different mechanical and physical functions:
.1), conflict coefficient: μ0. 003 ~ 0. 007 is one order of magnitude lower than the smoothness of the oil film. 2), microhardness: Hv690 ~ 1100 is one to three times better than the original appearance hardness. 3), coefficient of linear expansion, 13.6 ~14. 2 Same as steel. 4), impact strength: 50kg/mm2
.5), high temperature resistance: 1575 ~ 1600 ° C
.6), corrosion resistance: no corrosion in high humidity marine environment and acid and alkali medium.
.7), Electrical Insulation: 1-10μm Electrical Insulation Layer ART Coating Hardness Test 3D Image under Atomic Force Microscope Rocket Microhardness HV = 1145 Cylinder Liner Surface Atomic Force Microscope Drawing (3D)
Atomic Force Microscope Drawing of Rocket Microhardness HV = 546 Cylinder Liner (3D)
1-6: The scope of application of ART:
ART skills can be applied to any part of mechanical wear: mining machinery, metallurgical machinery, petrochemical machinery, construction machinery, automobile trains, ships, internal combustion engines, chains, bearings, etc. In the bearing manufacturing operations, it is urgent to use ART skills to extend the life of the train. It is a rolling mill bearing, railway bearing, motor bearing, wind power bearing, low noise bearing, fine bearing, etc.
2, ART pre-disposal 2-1: ART pre-treatment process experiment 2-1-1: Dalian Longzheng Weishi Metal Wear Self-Revision Skills Development Co., Ltd. is engaged in the development and application of ART application skills. Based on the "arrangement of resolution function" The concept of metal data research; repeated ART bench experiments:
â—† In August 2003, the intermediate chain quality supervision and inspection of the intermediate bench experiment; the progress of the oil roller chain life of 3. 3 times.
â—†2007; in the Zhejiang Tianma Bearing Co., Ltd. to do "ART6308 bearing bench experiment":
1000 hours of continuous bench test; the measured clearance and the pre-experimental clearance are reduced by 2-6 microns; clarify that ART skills can actively optimize conflicting open space; reach the best cooperation situation.
â—† In 2008, after the national bearing quality supervision and inspection, the intermediate gantry comparison experiment further proved that the ART skill can significantly extend the service life and reliability value of the bearing.
2-1-2 : ART pre-disposal method:
This method is to place the processed bearing parts in the medium rich in ART data; under the effect of the oscillating finishing machine; the outer surface of the bearing parts constitutes the diffusely spread ART layer; after the set is in the smooth oil containing ART or Work with smooth grease under smooth conditions; further transform the ART layer into a cermet-like layer; obtain the best conflict coefficient and collaborative open space.
2-1-3 : ART pre-disposal equipment In order to implement the sophisticated application process of ART pre-disposal; “Dalian Longzheng Gluing Machine Manufacturing Co., Ltd.†has developed a powerful LZD series and XL series correction agent circulating pre-disposal finishing machine. WZD horizontal large-scale ART pre-disposer can satisfy the ART pre-disposal of the 1.1m diameter rolling mill bearing; together with the stable and sophisticated pre-treatment process, quality control method and testing specification.
ART Pre-disposal 2-2 for satisfactory bearing diameter of 1.1 m: ART Pre-treatment principle 2-2-1: The appearance of the ART layer in the metal appearance of the metallographic microscope; there is a "gutter" micro-convex Body and pit and various shortcomings; in the pre-disposal of the polishing machine oscillation; under the effect of the exciting force; conflict; in the process of collision and kneading; the particles of ART powder are related to the appearance of most matrix conflicts For microprotrusions and pits; still large-scale particles; after being brought into the conflicting interface; further grinding and refining together also clean up the pits and defects of the conflicting appearance; prepare for the implantation of the nursery layer .
The microprotrusion is in the process of oscillation conflict and kneading; the flash point temperature caused by tearing and cracking; the high temperature grinding particles are wrapped by ART; and the bed is placed at a recess or defect with lower potential energy; The convex body orientation which is formed by the inducing layer and the tearing or cracking is also corrected by the effect of the conflicting force. The whole process of the ART pre-treatment makes the concave of the metal base, the "groove", the microcrack, the open space and the like. Everywhere, the ART gestation layer is generated.
The growth rate and thickness of the ART layer are related to the energy released by the conflict; the content of ART powder in the finishing machine is proportional to the time of the decoration.
This is the bearing tumbling body of GCr15 raw material; quenching and tempering hardness HRc62 degree; metallographic after pre-treatment of ART lacquer under the investigation of MEF4A high-grade metallographic microscope.
2-2-2 : The effect of the ART layer under working conditions is under the conditions of working conditions; especially the bearing of the rolling mill; under the effect of receiving the ultimate load under impact and enthalpy; the diffused spreading layer plays the role of the support seat. The axis accepts the whole process of the load operation; the interface of the ART layer is continuously changed; the compensation part is actively selected; the thickness of the composition is also actively conditioned; when the energy of the conflict release is reduced due to the conflict coefficient; and the temperature is reduced to a certain extent; The layer stops growth; the self-correction process is completed. The cermet layer can not only compensate the wear and tear; it can reduce the roughness of the external surface of the metal matrix; the original condition of the rehabilitation; it can also make the conflict resistance spread evenly; reduce the oscillation; save energy; The correction of the shape of the base metal work and the optimization of the collaborative open space.
2-2-3 : The further development of the ART in the working condition under the condition of the bearing is in the process of application; the effect of the conflicting force; relying on the conflict heat energy as the driving force; making the ART inoculating layer and the metal-based external surface attacking repercussions The composition is related to the iron-based metal; the microcrystalline ceramic layer associated with the chemical bond; the microcrystalline ceramic layer can dynamically correct and compensate for the wear of the matrix metal conflict surface; the intention of reaching the extended bearing life.
3. The influence of ART skills on the bearing life and reliability value 3-1: The experimental origin and intention are entrusted by Dalian Longzheng Weishi Metal Wear Self-Correction Skills Development Co., Ltd.; the national bearing quality supervision and inspection in the middle of the company Group deep groove ball bearings 6307; for comparison inspection. To check the effect of metal wear self-correction skills and ART finishing pre-treatment on the life and reliability of progressive rolling bearings.
3-2 : Experimental Plan 3-3: Samples were randomly taken from the same manufacturer and the same batch of bearings, and 20 sets of samples were randomly taken; the original condition was adhered to without any treatment; the group A was compiled; 40 sets of samples were taken out; The finishing machine and ART data are used for ART pre-treatment of the raceway, rolling body and the support frame in the bearing table; the outer surface of the bearing is dispersed and dispersed in the microcrystalline ceramic inoculating layer. After that, it is divided into groups C and D; the same sampling method is selected. Randomly take 30 sets of samples; do not carry out any treatment; adhere to the original condition; each set of 15 sets into E group, F group; take 15 sets of samples; use the polishing machine and ART data on the bearing table raceway, rollover external table and Adhere to the pre-disposal of the frame; make the outer surface of the bearing parts constitute a diffusely dispersed microcrystalline ceramic inoculating layer; edited into group G; perform experiments according to the experimental conditions in the table.
3-4: The experimental conclusion can be seen through this experiment; the single use of metal wear self-correction data as an additive for smooth oil or smooth grease; or a single use of pre-treatment skills for finishing; the raceway, roll, and appearance of the bearing And the persistence of ART for pre-treatment of ART is not significant. However, the two skills are used in combination; the life of the bearing can be significantly extended; the oil smoothing experiment and the bearing life ratio are more than three times. The reliability value From 97.9% to 99.7%, the experimental value of the grease-smooth bearing and the bearing extra life is more than 5 times; the life-span reliability value is improved from 77.44% to 99.98%.
4. Anatomy of the experimental conclusion 4-1: The national bearing quality supervision inspection in the middle of the ART pre-disposal bearing gantry comparison test proves: The ART pre-disposed bearing can significantly extend the bearing under the smooth condition of ART smooth oil or grease. Use the life.
4-2: The operating conditions of the bearing parts after ART pre-treatment are different; the cycle of converting the ART layer into a cermet layer is also different. This fits the criteria of the ART layer; these are different. Operating conditions include: bearing speed, load size, smooth conditions, temperature, the size of the ART powder and its content in oil or grease; the quality and hardness of the raw materials and appearance of the metal conflict.
4-3: According to the experimental conditions of JB/T50013-2000, "Experimental Regulations for Life and Reliability of Rolling Bearings"; the conclusions obtained are fair and objective. It has a wide range of counseling values, and it is widely used in the market. In terms of practical application conditions; it is a comparative experimental conclusion obtained by a fatigue test machine under certain conditions; it is not yet possible to generalize the various kinds of bearings under practical conditions. It has been exemplified: a single ART disposal or A single selection of smooth oil or grease can also significantly extend the life of the conflicting pair.
The conclusion is concluded after the analysis of the intermediate bearing quality inspection by the national bearing quality supervision; the service life of the bearing after the metal wear self-correcting skill can be greatly improved; the ART bearing replaces the import becomes possible; then it can be promoted to the induction level of the Chinese equipment operation; Great economic and social benefits will occur. In the implementation of new skills; we must also consider the criteria for cost-effectiveness; we will work together with the bearing industry entrepreneurs and professors; with the simplest method, the lowest cost, the most Great efficiency, the fastest speed; together to create a "longevity number bearing" manufacturer.
Here, Beijing Weishi Alte and Dalian Longzheng Shishi sincerely express their sincere gratitude to the leaders and professors of the China Axis Association, to the national bearing quality supervision and inspection, and to the colleagues in China's bearing manufacturing operations!
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Source: China Bearing Network Time: 2018-01-01