1、 本科毕业设计（论文） （外文翻译） 题 目 75 拖拉机变速箱 壳体 机械加工工艺规程设计 学生姓名 XXXXXX 专业班级 机械设计制造及其自动化（本科二班） 学 号 200933080 院 （系） 机械工程学院 指导教师 (职称 ) XXXXXX 郑州科技学院机械工程系 二一 三 年 五 月 十八日 Gearbox shell machining process design Manufacturing Engineering and Technology Machining Mechanical Industry Press In March 2004, version 1 p560
2、564 （ Serope kalpakjian） （ Steven R.Schmid） Abstract Gearbox shell is a more complex structure of spare parts box, its high precision, complex process, and the processing quality will affect the overall performance engine, so it has become the engine manufacturers focus parts one.Machining process p
3、lanning must guarantee the machining quality of parts, to meet the technical requirements stipulated in drawings, at the same time should also have high productivity and efficiency. Therefore, machining process planning design is an important work, requires designers must have a rich experience in p
4、roduction practice and wide range of mechanical manufacturing technology basic theory knowledge. In the specified procedure, should according to the production of parts and the existing equipment conditions, taking the processing quality into account, productivity and economy requirements, after rep
5、eated analysis and comparison, to determine the optimal or the best solution. 1.Technical Characteristics of the gearbox shell The gearbox shell process features are: the structure of complex shape； processing plane, more than holes； uneven wall thickness and stiffness is low； processing of high pre
6、cision typical of box-type processing part. The main processing of the surface of cylinder block top surface, the main bearing side, cylinder bore, the main and camshaft bearing bore holes and so on, they will directly affect the machining accuracy of the engine assembly precision and performance, m
7、ainly rely on precision equipment, industrial fixtures reliability and processing technology to ensure the reasonableness. 2.The gearbox shell process design principles and the basis Design Technology program should be to ensure product quality at the same time, give full consideration to the produc
8、tion cycle, cost and environmental protection； based on the enterprises ability to actively adopt advanced process technology and equipment, and constantly enhance their level of technology. Gearbox shell machining process design should follow the following basic principles: 2.1 The selection of pro
9、cessing equipment The principle of selection adopted the principle of selection adopted the principle of combining rigid-flexible, processing each horizontal machining center is located mainly small operations with vertical machining center, the key process a crank hole, cylinder hole, balancer shaf
10、t hole High-speed processing of high-precision horizontal machining center, an upper and lower non-critical processes before and after the four-dimensional high-efficiency rough milling and have a certain adjustment range of special machine processing； 2.2 Concentration process principle Focus on a
11、key process in principle process the body cylinder bore, crankshaft hole, Balance Shaft hole surface finishing and the combination of precision milling cylinder head, using a process focused on a setup program to complete all processing elements in order to ensure product accuracy The key quality pr
12、ocesses to meet the cylinder capacity and the relevant technical requirements； 3.The gearbox shell machining process design the main content Gearbox shell complex structure, high precision, arge size, is thin-walled parts, there are a number of high precision plane and holes. Engine block machining process
