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1、 Eccentric shaft heat treatment and mechanical properties researchAbstract This paper focuses on the eccentric shaft material 20Cr heat treatment (carburizing, quenching, a tempering, and second tempering) process and its main mechanical properties, high hardness is main properties. Analysis how Car
2、burizing temperature ,time an, cooling method ,direct quenching ,a quenching, secondary quenching and other factors defect on the mechanical properties and organization from the theory. After confirmed 20Crs eccentric shafts best heat treatment process parameters and the best carburizing quench way
3、(salt bath, direct quenching, low temperature tempering), analysis and detect the infiltration depth of the carburized, microstructure and mechanical parts.Key words: eccentric shaft, heat treatment, carburizing, carburizing temperature, cooling method, carburized layerChapterThe introduction1.1 Pre
4、face The role of the eccentric shaft is to adjust the center distance between convenient, eccentric shaft is usually used in the V-belt drive in the planar linkage. Normal shaft can only drive the work piece, but the eccentric shaft, not only can pass the rotation, also can pass the revolution. Now
5、the U.S. compressor giant Copeland is using eccentric shaft to drive the vortex of revolution and efficient compression formulations fast. Eccentric shaft is an important transmission part of electric tool electricity hammer. Install the eccentric shaft and let it running to dead spots position will
6、 not produce locks by inertia effect. The most common example is: household sewing machine feet moving wheel of the operation. Rotating eccentric shaft driven machine is the indispensable machinery parts.Schematic diagram of the eccentric shaft1.2 The purpose of the eccentric shaft and performance r
7、equirements Eccentric shaft is widely used in mining, electromechanical, water conservancy, etc. With the increase in the production of these products, and consumer groups asked the continuous improvement of the quality of the eccentric shaft is imminent, exported 400 million air-conditioning compre
8、ssor units by 2008, air exports increased by 27% than in 2005. Air conditioning compressor is exported to South East Asia mainly. Because the eccentric shaft under enormous impact load at work, and the hammer of the working conditions, many dust, parts wear easily. Therefore, the surface of the ecce
9、ntric shaft required high hardness, wear resistance and fatigue strength, while the core part has a certain strength and good plasticity, toughness and other special properties.1.3 The situation at home and abroad 1.3.1 Domestic Research Trends Heat treatment has a long history in China, with other
10、scientific and technological development, heat treatment technology develop the rapidly . (1) Namely, the continuous improvement of experimental methods and techniques. Understanding the relationship between the changes in the organization of metal rules and microstructure, develop new heat treatmen
11、t process. (2) In the basic theoretical aspects continuously make achievements. (3) The research of surface chemistry, develop all kinds of surface protective heat treatment and surface strengthening heat treatment. (4) Other new energy, new technology development, make heat treatment process become
12、 complex process. Recent sessions of the International Conference on Materials and Heat Treatment predicts the development of ancient and modern metal heat treatment process and heating equipment t, the basic view is: (1) heating equipment In the heating device to more development of electric furnac
13、e, especially the development of induction furnace, reducing fuel furnace. Most of the furnace and heat treatment equipment to achieve automation and digital control, not only can reduce the labor force, but the premise is to improve the quality of heat treatment. (2) Heat treatment process a. Impro
14、ved conventional heating process. Air heating will be vacuum heated, controlled atmosphere or protective atmosphere heating, as well as vacuum and controlled atmosphere heating joint will replace air heating. With the vacuum technology progress, vacuum heat treatment towards furnace temperature incr
15、eased and the automation. Induction heating treatment, tend to increasing power and frequency range direction. b. expansion of the surface heat treatment and various types of chemical treatment instead of the whole heat treatment. 1.3.2 Heat treatment equipment and heat treatment technology abroad s
16、tatus () in the early 1970s, American Society for Metals (ASM), British Wolf Morrison heat treatment center (Wolfson Heat Treatment Center) and the former Yugoslavia (now Croatia) have established the material and Heat Treatment, did it may, according to the database of mechanical performance requirements after heat-treatment of computer-aided material selection, or known material and Heat Treatment p
