摘要

阀体零件的加工质量将直接影响机器的性能和使用寿命。本次设计旨在提高阀体零件的加工效率，由此我们首先对阀体零件的结构特征和工艺进行了仔细的分析，然后确定了一套合理的加工方案，加工方案要求简单，操作方便，并能保证零件的加工质量。为了提高劳动生产率，降低劳动强度，保证加工质量，需设计专用夹具，以满足加工过程的需要。

本课题是阀体零件的机械加工工艺及工艺及夹具设计的设计，阀体是各种阀中的一个重要部件，它和管道直接连通，具有一定压力和温度的介质在阀体内流动。通过阀芯的开启与关闭对流动介质进行切断、调节、减压、节流或改变介质的流动方向。因此不同用途的阀门，阀体的结构和形状也不相同。其中机械加工工艺过程程就是用切削的方法改变毛皮的形状、尺寸和材料的物理机械性质成为具有所需要的一定精度、粗糙度等的零件。机械加工工艺规程是规定零件机械加工工艺的过程和操作方法等的工艺文件之一，它是在具体的生产条件下，把较为合理的工艺过程和操作方法，按照规定的形式书写成工艺文件，经审批后用来指导生产。机械加工工艺规程一般包括一下内容：工件加工的工艺路线、各工序的具体内容及所用的设备和工艺设备、工艺的检验项目及检验方法、切削用量、时间定额的等。

关键词：阀体；机械；加工；工艺；夹具

Abstract

The machining quality of valve body parts will directly affect the performance and service life of the machine. The purpose of this design is to improve the machining efficiency of valve body parts. From this, we analyze the structure and process of valve body parts carefully, and then determine a set of reasonable machining scheme, which is simple and convenient to operate. And can guarantee the processing quality of the parts. In order to improve labor productivity, reduce labor intensity and ensure machining quality, special fixture should be designed to meet the needs of machining process.

The subject is the design of the machining process and process of the valve body part and the design of the fixture. The valve body is an important part of various valves, it is in direct communication with the pipeline, and the medium with certain pressure and temperature can flow in the valve body. The flow direction of the medium is regulated, reduced, throttled or changed by the opening and closing of the valve core. Therefore, the structure and the shape of the valve and the valve body of different applications are not the same. In which the process of mechanical processing is to change the shape, size and physical mechanical properties of the fur with the method of cutting into parts with the required accuracy, roughness, and the like. machining process gauge Process is one of the process documents which prescribes the process and operation method of mechanical processing of parts. It is to write the more reasonable technological process and operation method into process documents according to the prescribed form under the specific production conditions. After examination and approval, it is used to guide production. The machining process rules generally include the following contents: the process route of the workpiece processing, the specific contents of each process and the equipment and process equipment used, the inspection items and methods of the process, the cutting amount, the time quota, and so on.

Key words: valve body; machinery; machining; process; fixture