1、 本科毕业设计 （本科毕业论文） 外文文献及 译文 文献、资料题目： The Processing Of Slender Shaft 文献、资料来源： 期刊（著作、网络 等） 文献、资料发表（出版）日期： 2010.7 院 （部）： 机电 工程学院 专 业： 机械工程及自动化 班 级： 姓 名： 学 号： 指导教师： 翻译日期： - 1 - 外文文献： The Processing Of Slender Shaft Diameter and length which is more than 1:20 called the slender shaft axiso In cutting forc
2、e,cutting heat and the effects of vibration,the slender transverse axis bending easily lose their accuracy,therefore,Turning to reverse progress,when we use the center rest and follower rest reasonably,in addition to the best tool geometric parameters,cutting the amount of a series of effective tech
3、nological measures,we can achieve the processing requirements. Mechanical analysis is carried out to the deformation of workpiece when turning slender shafts in the normal and reversed direction under two different conditions of clamping.Mathematical models are set up for the calculation of bending
4、deformation resulting from cutting force.An example is given to show that bending deformation and the resulting machining error in conditions of reversed turning is much less than that in normal turning.The result has been verified by experiments. Due to the high length-to-diameter ratio of slender
5、shaft,workpiece flexural deformation and vibration are frequently encountered during cylindrical turning of slender shaft. Thus, turning slender shaft is still a well-known difficult technical problem. Today, this problem is solved basically by empirical workmanship of the operator. This results in
6、the fact that a demanding technical level of the lathe operator is essential for turning of slender shaft. And the productivity is very low. In order to solve the problem of slender shaft that generate bending deformation and impact seriously on processing quality due to a big slenderness ratio,poor
7、 rigidity and turning forces,the method of slender shaft manufacturing with double-tool turning in lathe is introduced.The model is built based on elementary theory of beam.The lateral displacement of slender shaft is ansysed utilizing finite element(FE) method The high precision slender shafts are
8、used very widely in various precision machine equipments and apparatus,but its processing is very complicated,and has uncertain precision and low efficiency.Based on the adaptive control system, the system to processing the slender shafts with high precision and efficiency under the NC environment w
9、as put forward,which can process diversified slender shafts with various precisions. - 2 - Turning of slender shaft is difficulty in mechanical processing.The theoretical formula of machining error in turning of slender shaft is derived.The error distributing graph is obtained by computing.The resea
10、rch provides theoretical references for predict machining error in turning of slender shaft. The processing characteristics of the slender shaft: the Hardness of the slender shaft is poor,when Improper turning is Incorrect, It is easy for the role of cutting force and gravity generated bending defor
11、mation, vibration, thus affecting the machining accuracy and surface roughness. The thermal diffusion of Slender Shaft is poor ,Under the action of the cutting heat resulting considerable expansion of the line,If a fixed support at both ends of the shaft, the workpiece will stretch and bend. Because
12、 the shaft is longer, a tool path use long time, tool wear large, thus affecting the precision of the geometry of parts. Since using the tool holder to turning Slender Shaft if the support block supporting the workpiece on the part of the two pressure Bushi Dang Will affect the machining accuracy. I
13、f the parts which are used to supporting the workpiece have inappropriate pressure on the workpiece,It will affect the machining accuracy .If the pressure is too large or no contact, it does not work and can Not increase the stiffness of parts. If the pressure is too large, the part is pressed to th
14、e lathe, the cutting depth increases, the diameter will be smaller, As with the tool holder to move, the support block supporting the small-diameter cylindrical Department, from the supporting block and the workpiece, cutting out will get out of the workpiece, the cutting depth decreases, turning ou
15、t the diameter of the larger, later with the knife and With the large-diameter circle, pressing the workpiece to the lathe again, so that the diameter of a smaller car, so there is continuous change in the law, the thin parts will cars into a bambooshape. Caused by machine tool, workpiece, cutting t
16、ool technology system adverse to cutting rigid difficult, not easy to get a good surface roughness and geometrical accuracy. This paper discussed the influencing factors of machining accuracy of slender shaft,and put forward some measures of improving the machining accuracy from the aspects of insta
17、l-lation way,cutting tool angle,cutting parameters and new processing methods. We explore through practice, using a variety of turning devices. such as three-bearing block with the knife, flexible active thimble, pads, bearing bracket,we can use Turning by reverse feeding with the best tool geometry Parameters, cutting and a series of effective measures. It
