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1、毕业设计译文课题名称： 淬硬齿轮的加工专 业： 机械设计制造及其自动化班 级： 05级6班学 号： 06050619姓 名： 冯健均指导教师： 王丽完成日期： 2009.04.20吉林大学珠海学院机电工程系Hardened GearModern gear is the most common machines in a mechanical transmission, the passing of the machine as a driving force and the main form of movement is an important foundation for machine
2、ry parts and components. With the belt, chain, friction, hydraulic mechanical transmission, etc., compared with the power range, high transmission efficiency, high circumferential speed, transmission ratio accuracy, long service life, long size, structure and other characteristics of small size. The
3、refore, it has become indispensable in many mechanical products of transmission parts, gear drive machine is the modern machines is the most common form of mechanical transmission, the passing of the machine as a driving force and the main form of movement is an important basis for mechanical produc
4、ts components. With the belt, chain, friction, hydraulic mechanical transmission, etc., compared with the power range, high transmission efficiency, high circumferential speed, transmission ratio accuracy, long service life, long size, structure and other characteristics of small size. Therefore, it
5、 has become indispensable in many mechanical products of the transmission components, but also the proportion of machinery in the form of the largest transmission. The design and manufacture of gear will have a direct impact on the level of mechanical performance and quality products. As the gear in
6、 the industrial development in a prominent position, with the result that gear is recognized as a symbol of industrialization. The characteristics of gear In recent years, although other mechanical components of the manufacturing technology and electric drive technology has made significant developm
7、ent, but in the production of the dominant form of transmission is still a variety of gear. Gear has the following advantages and disadvantages: A. Advantages 1) the instantaneous transmission ratio constant, the higher the smooth working; 2) the use of non-circular gear, the instantaneous transmiss
8、ion ratio changes may be required for design; 3) changes in transmission ratio range, in particular the use of planetary transmission, the transmission ratio can be 100 200 (single stage), or slow down the growth rate for transmission; 4) speed range, gear from the circular speed V 0.1M / S to reach
9、 200m / s, or higher; speed from n 1 r / min to more than 20000r/min; 5) power transmission range, high carrying capacity, high-speed gear transmission power of the transmission power can be achieved 50000kW or more, low-speed torque for heavy-duty gear can reach more than 14 * 105N M; 6) high trans
10、mission efficiency, especially in high precision cylindrical gear pair, and its efficiency can reach more than = 0.99; 7) structure, such as the use of planetary gear drives, differential gear drive less, or harmonic drive, the more narrow the parts can become a transmission line; 8) easy to maintai
11、n. B. shortcomings 1) operate in vibration, shock and noise, and generate dynamic load; 2) the role of non-overload protection; 3) The requirements of high precision gear tooth or tooth with special needs high-precision machine tools, special tools and measuring instruments to ensure that, the compl
12、exity of manufacturing processes, higher cost. For power transmission gears and gear box, the size requirements of smaller, lower gear noise, resulting in the demand for hardened gears and gear manufacturers to put forward a new method to explore the processing gear requirements. Gear in the process
13、 of hardening heat treatment, the materials and the stress changes in gear will usually have a deformation, that is, tooth, teeth and pitch to the error. This error will cause the tooth profile at the time of the transmission is incorrect mating, thereby increasing the load, resulting in gear noise.
14、 Therefore, after the hardening heat treatment of gear in general should be added finishing processes to work together. Hardened gear finishing process can be divided into two types: one is the use of non-forming the cutting edge, such as grinding gear; the other which is formed with cutting edge ge
15、ar, such as hardened (HRC48 53) Hobbing processing . This article will focus on the hardware used for processing hobbing cutting edge carbide tools forming the finishing process. Todays carbide materials, coatings and hobbing machine tool technology, has hardened roller gear technology plus workers
16、have been significantly improved, especially in the processing of less than or equal to the small and medium-sized module 12DP gear, they can afford the hardware generated by cutting the course of the great cutting force. The selection of carbide hob Carbide hob species in the material specifications, there has been major progress. Ultr
