机械毕业设计-活塞机械加工工艺规程及粗镗销孔夹具设计.doc

摘要
机械产品的生产过程是一个复杂的过程。机械制造工艺是机械制造方法和过程的总称。而生产过程中改变生产对象的形状、尺寸、相对位置和性质等,使其成为成品或半成品的过程,则称为工艺过程。它是生产过程中的主要部分,其他过程称为辅助过程。本次毕业设计的课题是活塞的工艺设计,主要内容如下:
首先,进行零件的分析,主要是零件作用的分析和工艺分析,通过零件分析可以了解零件的基本情况,而工艺分析可以知道零件的加工表面和加工要求。根据零件图提出的加工要求,确定毛坯的制造形式和尺寸的确定。
第二步,进行基面的选择,确定加工过程中的粗基准和精基准。根据选好的基准,制订工艺路线,通常制订两种以上的工艺路线,通过工艺方案的比较与分析,再选择可以使零件的几何形状、尺寸精度及位置精度等技术要求得到合理的保证的一种工序。
第三步,根据已经选定的工序路线,确定每一步的切削用量及基本工时,并选择合适的机床和刀具。对于粗加工,还要校核机床功率。
最后,设计第5道工序的夹具。先提出设计问题,再选择定位基准,然后开始切削力、夹紧力的计算和定位误差的分析。然后把设计的过程整理为图纸。
根据以上的概述完成本次设计。
关键词:活塞;机械加工工艺设计;夹具设计;
ABSTRACT
The mechanical product production process is plex process. The machine manufacture craft is the machine manufacture method and the process always called. But in the production process changes the production object the shape, the size, the relative position and the nature and so on, causes it to e the end product or the half-finished product process, then is called the technological process. It is in the production process main part, other processes are called the supporting process. This graduation project topic is the piston technological design, main content as follows:
First of all, it is mainly analysis of the function of the part and craft analysis to carry on the analysis of the part, through part analyses can find out about basic situation of part, and craft analyses may know the processing surface of the part and is it require to process. The processing demand put forward according to the part picture, confirm the manufacture form of the blank and sureness of the size.
The second step, carry on the choice the base , confirm thick datum and precise datum in the processing course. According to the datum chosen , make the craft route , usually make the craft route of more than two kinds, with analysing through parison of the craft scheme, and then choosing be able to make such specification requirements as the precision of geometry form , size of the part and precision of position ,etc. get a kind of process of the rational assurance