Born in the year of Mu Chun, he graduated from Xi'an Wei's metal thermal processing technology in 1983. He is directly engaged in professional and technical work. He is currently the director and engineer of Hefei Bearing General Factory heat treatment branch, and wrote for the first time. 1The production line equipment constitutes the nitrogen-based drawing atmosphere casting chain furnace production line equipment 1. 2 equipment improvement The original production line of the conveyor belt drive shaft and passive shaft are flash chain transmission 2 force. It is transmitted by the factory, the distance between the longer links is small, and the dislocation during operation is not only difficult for maintenance, but also easy to cause damage to the mesh belt. We changed the passive wheel sprocket of the auxiliary conveyor belt to the light wheel 6 cabinet. The motor shaft is longer, and the fan swings when working. The motor is easy to burn out the noise, improve the 6-connected shaft transmission form of the old 4, the effect is very good, not only the fan runs 1 compressor; 2 air storage tank; 3 filter; 4 cold dryer; 5 carbon molecular sieve; 6 crude nitrogen storage Tank; 7 methanol cracking equipment 3 original feeding mechanism failure gas set gas removal 7; 10. Carbon molecule 12 front cleaning hoist quenching furnace oil pool cleaning (3) cooling tempering furnace, 5 圮 lifting hopper chain strength Low, easy to stretch and cause long chain phenomenon, we changed the chain material originally made of low carbon steel plate to spring steel, avoiding the phenomenon of card chain. 4 The pneumatic control valve of the crude nitrogen in the front part of the nitrogen generator is originally AC solenoid valve milk 4, 18, 220. The use of the solenoid valve is high and easy to damage, which affects the nitrogen production effect. We changed it to DC solenoid valve 24, adding a transformer to the front, eliminating this point of failure. 5 Adding activated carbon to the nitrogen generator filter to filter the hydrophobic water in the compressed air to prevent the poisoning of the molecular sieve, and overcome the defect that the original filter only filters the suspended particles in the compressed air. 3 Nitrogen parameters and nitrogen analysis Whether the product quality test of the heat treatment of the base and the atmosphere can meet the design requirements is whether the guarantee test can be guaranteed in the raft. The test results are listed in 1. I can see from it. The nitrogen purity reached 99.995. When the dew point is high, the surface of the workpiece is blue, and the dew point is 4, when the surface is silvery white. Therefore, adjusting the dew point of the control gas is the key to changing the color of the ferrule. There are two ways to reduce the dew point. The water content of the gas used in controlling the molecular sieve is the residual oxygen content of the oxygen removal process. The oxygen removal process uses methanol to catalyze the low temperature cracking to produce hydrogen in the hydrogen and crude nitrogen to form water, and remove the oxygen contained in the nitrogen. . The gas supply quality of molecular sieve is mainly water content +, which affects the adsorption capacity of molecular sieve and the quality of crude nitrogen, and the increase of water will also make the gas dew point. The high gas supply quality is due to the regional season, etc. +15 gas humidity is large, coarse The nitrogen dew point is high and vice versa. Therefore, it is necessary to minimize the water content in the gas supply, otherwise it is easy to cause the water-removing carbon molecular sieve 5 into the molecular sieve to reach saturation prematurely before the regeneration time, and the ability to remove water is lost, so that the dew point of the gas entering the furnace is too high. Under the normal conditions, the optimal card force of the carbon molecular sieve is 0.6 08, but in the case of satisfying the gas supply pressure and the gas supply amount in the furnace, the positive pressure supply in the furnace can be ensured. Excessive high nitrogen pressure requires high hydrogen pressure during deaeration. High molecular pressure per unit time. Molecular sieves are used. Pressure molecular sieve switching time. Crude nitrogen tank pressure nitrogen purity. Alcohol cracking gas supply Im3h1 hydrogen content deoxidation temperature dew point residual oxygen Content kio6 fine nitrogen tank pressure nitrogen purity color blue-white silver white blue blue-blue groove ball bearing noise reduction art Luoyang bearing research institute Yang Jinzhou Sun Liming Tungsten Bearing Factory Liang Zhong Tang Xiaohua Chen Pan With the development of technology, some precision machinery And the high-end household appliances pay for the vibration and noise of rolling bearings are put forward as strict requirements. These products not only require low vibration of the bearing, but also good quality, and require the bearing to have a fixed vibration life and noise life. According to relevant statistics, there are about 130 million sets of low-noise deep groove ball bearings in China. Due to the technical development capability of bearing products and the limitation of production and manufacturing level, domestic high-grade low-noise deep groove ball bearings can not meet domestic support. The needs of the market. Compared with the advanced level in foreign countries, the outstanding problem of domestic deep groove ball bearings is that the vibration value of the pedestrian quality difference vibration life and noise life can not meet the requirements of the host. In order to reduce the bearing vibration and improve the bearing sound quality, some domestic bearing manufacturers have done some research and exploration work in the product design process tooling cleanliness steel ball processing technology grease and cage, and achieved certain results. According to the current needs of domestic and international market development, how to control bearing noise has become an important issue that the bearing industry needs to solve urgently. At the same time, it is also an important means for bearing manufacturers to improve the competitiveness of the product market. For this reason, Luo Bearing Research, the 1st Mountain Bearing Factory formed a joint technical research team to carry out technical research on 60822 bearings. The goal is to reduce the vibration and noise of the bearing. Increasing the internal gas flow rate, the amount of hydrogen required for oxygen removal is large, the pressure and the pressure generated by the 2 reaction increase, and the amount of water adsorbed by the 5 molecular sieve increases. When the adsorption capacity is exceeded, the nitrogen dew point into the furnace is high. The high gas supply pressure can be adjusted by adjusting the pressure of the nitrogen tank. But this increases the consumption of farm 1 group 1 data. Molecular sieves use pressure timing, high crude nitrogen pressure, mass drop, oxygen content, addition, hydrogen consumption, addition, dew point, high 1 group 4 data. The crude nitrogen pressure is low, the quality is improved, the oxygen content is reduced, the hydrogen consumption is reduced, and the dew point is lowered by the second group data. The gas supply pressure is too low. During the same switching time, the molecular sieve adsorption effect is reduced, the crude nitrogen quality is also poor, the hydrogen consumption is increased, the dew point is increased by the third group data; if the crude nitrogen pressure is lowered, the crude nitrogen can be increased. Quality, reducing the dew point, but does not guarantee the pressure required to enter the furnace gas. The amount of hydrogen peroxide is an important indicator of silvery white light. According to the production practice, it is more ideal to control the hydrogen content around 13, in the case of the same methanol cracking gas supply. The control of the amount of hydrogen per pass is determined by the quality of the crude nitrogen and the amount of oxygen removed. The crude nitrogen has a large amount of low oxygen and a decrease in the amount of hydrogen. When the quality of the crude nitrogen is high, if the amount of gas is large, the amount of oxygen is increased, the amount of hydrogen is increased, and the amount of hydrogen is also decreased. Therefore, controlling the molecular sieve uses pressure and crude nitrogen gas production to control the dew point and hydrogen content of the gas. Under the premise of nitrogen purity of 99.995 and hydrogen content of 13, when the dew point is controlled at 60, the product quality is high, the surface is silvery white in production, and when the air humidity is large, the coarse nitrogen can be adjusted and lowered. Gas production pressure, increase the gas supply pressure, reduce the amount of gas deoxidation, in order to achieve the purpose of reducing the dew point and ensuring 1 hydrogen. Production proves that the equipment can reach the required gas volume of 25 to meet the requirements. 4 Process parameters in summary, report, production practice, we, process parameters are continuously revised and tested, the results show that the outer diameter of 150, the bearing ring, Select the following art, number. Milk is ideal. The gas supply volume of the furnace is 172,131, which accounts for 2 of the total gas volume. The gas supply volume of the furnace mouth is 81焱, which accounts for 0.25å’ of the gas supply pressure of the whole gas volume. 1 When heating 406, the mountain 1 tempering time 3, the product quality test hardness is 6162, and the hardness difference between the parts is the largest. 1è°¬ Roundness Super Left Rate Editor Lu Chengyin Jiang Xinqi in the current period. Ma Jiayu. High-speed precision angular contact ball bearing structure and performance. The basic structure and structural parameters of the high-speed precision angular contact ball bearing are introduced. Qualitative analysis of their effects on the high-speed performance and rigidity of bearings, and the determination principle of bearing structure and structural parameters for high-speed rotation and ultra-high-speed rotation applications. These determination principles also have a reference for other high-speed precision bearings. Attached to one, reference descriptive angular contact ball bearing high-speed bearing precision bearing structural performance Cai Yaxin. The design and error of the mating angular contact ball bearing projection 3 constitute a large influence on the bearing projection amount of the single bearing of the pair of bearings. In the bearing design, the degree and direction of the influence of the machining error of each parameter on the amount of protrusion should be reasonably determined according to the combination of the bearings. It also ensures that the single set of bearings has a small convexity tolerance with a symmetric distribution in the positive and negative directions, thereby improving the bearing ratio and production efficiency of the bearing. Attached 1 and 3 references. The angular position error analysis of the angular contact ball bearing assembly is applied to the condition of low-speed oscillating motion or static load, and its performance depends on the design of needle roller clearance and inner-night raceway tolerance. Is it reasonable? The design method of the full needle roller bearing is introduced. Attached to one. 1 , 3456 capacity summary descriptor needle roller bearing full rolling body bearing design clearance tolerance Jiang Wei. Meng Qingwei. Xu Hao. The pre-tightening force of the double row angular contact ball bearing is divided into the performance of the double row angular contact ball bearing, and a predetermined preload force must be applied thereto. At the same time, the host has high sensitivity and low friction torque requirements for such bearings, so the pre-tightening force applied to it must be accurate, which can be achieved through actual measurement and theoretical calculation. Attached 7 pieces, 2 references. Descriptor double row bearing angular contact ball bearing preloading force Song Chunxi. Ma Zhong. Zhang Hongpu. The nitrogen-based controlled atmosphere casting chain furnace production line introduced the improvement measures of the 铸, 170 chain furnace and the 3,595 carbon molecular sieve nitrogen plant and the selection and debugging of the process parameters. The main factors affecting product quality and control methods are analyzed, and the ideal process parameters are provided. Attached to the 4th, 1st, the descriptive nitrogen-based atmosphere furnace casting chain furnace nitrogen production equipment production line Yang Jinzhou. Sun Liming. Liang Zhong and so on. Deep groove ball bearing noise reduction process. Shaft bearing vibration and noise control is a system engineering. It is related to a variety of factors in the bearing product. Through the improvement of the production process of the 60822 low-noise bearing, the two-stage product was trial-produced. Product quality has improved significantly. With the super-finishing ultra-fine process mesh cross-section angle, it is expected to give the best quantitative range of lubrication effect through experimental research. 3 Progressive study of the relationship between rolling contact wear particles and wear state. 4 Rough and lubricated from the boundary The lubrication of the film lubrication is not a point, but a process that occurs in a certain speed or load 1 domain. It is recommended to study the influence of the appearance of the agricultural surface on this transformation area, so as to establish a more reasonable criterion for assessing the transformation of the lubrication state. 5 Progressive research Different processing techniques have started the ball bearing. The formation speed of the medium film and the influence of the oil film remain simple, and this high-precision bearing has important practical significance in preventing early severe wear. 6 In order to clarify the dynamic contact condition of the bearing pair, it is recommended to carry out research on the rough and surface dynamic contact, so as to open up a new research field of surface shape and mixed lubrication and partial elastic lubrication. 1 Li Xinglin. The experimental research on the point-contact rolling friction pair wear-in process and its 1 cent. Zhejiang University. 1987. Editing Deng Liufang The Pedal Garbage Bin is designed with strong steel pedal, inner bucket. Some Foot Pedal Rubbish Can are equipped with build-in odour filter placement. You could place odour filters inside the lid to reduce the moisture and odours inside the bucket. It is ingerprint-proof, smudge-resistant Stainless Steel is easy to clean. pedal dustbin,step trash can,kitchen trash can,pedal bin,garbage bin TAISHAN YUEXIN INDUSTRIAL GROUP LIMITED , https://www.yuexingroup.com
August 24, 2021