基于ug传动箱体结构设计及加工路线拟定 大学毕设论文.doc

摘要本文给出了传动箱加工工艺规程的具体方法和步骤, 机械加工余量、加工工序尺寸的大小、及毛坯料尺寸大小的选择和确定,并确定每道加工工序的切削用量和切削工时。包括传动箱体零件结构特点和技术要求、毛坯的选择、定位基准的选择、夹具的选择设计等。制定正确的工艺路线,加工阶段划分,工序的顺序等,写出指定的工序卡片。本设计是传动后箱体零件的加工工艺规程及一些工序的专用夹具设计。箱体零件的主要加工表面是平面及孔系。一般来说,保证平面的加工精度要比保证孔系的加工精度容易。因此,本设计遵循先面后孔的原则并将孔与平面的加工明确划分成粗加工和精加工阶段以保证孔系加工精度基准的选择分为粗基准和精基准,粗基准选择首先保证工件某重要表面的余量均匀,表面应平整,没有浇口或飞边等缺陷,而且只能用一次,以免产生较大的位置误差。应选择该表面作粗基准。精基准的选择应尽可能使各个工序的定位都采用同一基准,当精加工或光整加工工序要求余量小而无效均匀时,应选择加工表面本身作为作为精基准。机械夹具在我国的发展前景是十分广泛,有着很大的发展空间。机械夹具的要求结构简单,使用方便,制造精度高。就本次而言,整个加工过程均选用组合机床。夹具选用专用夹具,夹紧方式选用气动夹紧, 夹紧可靠,机构可以不必自锁。因此生产效率较高。适用于大批量、流水线上加工。能够满足设计要求。通过本次毕业设计,是我更加明了的了解了传动箱体的结构特点, 如何加工,夹具的使用方法选择路线,使得以后对此方面更加的熟悉。关键词:传动箱; 工艺规程; 机械加工余量; 加工工序; 夹具设计。 Abstract In this paper, gearbox process planning of specific methods and procedure s, machining allowances, step size, and the rough size selection and determina tion, and to determine the amount of each process of cutting and cutting hours. Introduced the boring jigs, drilling fixture design of the specific proc ess. Structure features and technical requirements, including transmission box body parts blank choice, the choice of the locating datum, the choice of fixture design, etc. Make the right process route, processing stage division, process order etc., to write the specified process card. This design is the processing technology of the gear box parts and the special fixture design. The main processing surface of the box parts is the plane and the hole. Generally speaking, it is easier to guarantee the machining accuracy of plane than to guarantee the machining accuracy of the hole. Therefore, the design follows the first after the principle of hole and the hole and the plane processing clearly divided into roughing and finishing stages to ensure machining precision benchmark selection is divided into coarse and fine reference base, crude benchmark choose first to ensure that the margin of a major surface of the work piece uniform, the surface should be smooth, no gate or flash and other defects, and can only b