Machining process requirements for mechanical parts

Mechanical manufacturing process generally refers to the sum of the machining process of mechanical parts and the assembly process of the machine. To formulate the machining process, it is necessary to determine the number of processes that the workpiece will go through and the sequence of the processes. Only the main processes are listed. The brief process of the title and its processing order is called the process route.

The formulation of the process route is to formulate the overall structure of the process. The main mission is to select the processing method of each surface, determine the processing sequence of each surface, and the entire process. The number of steps in the process, etc. The formulation of the process route must follow certain principles.

First, the principle of formulating the process route of machined parts:

1. Machining the reference surface first: During the machining process of the part, the surface as the positioning reference should be machined first, so as to provide a precise reference for the subsequent processing as soon as possible. Known as 'baseline look-ahead'.

2. Divide the processing stage: Surfaces with high processing quality requirements are divided into processing stages, which can generally be divided into rough There are three stages of machining, semi-finishing and finishing. It is mainly to ensure the quality of processing; it is conducive to the rational use of equipment; it is convenient to arrange the heat treatment process; and it is convenient to find blank defects.

3, face first and then hole: for parts such as box, bracket and connecting rod, the plane should be machined first and then the machined hole. In this way, the hole can be processed in a plane position, the positional accuracy of the plane and the hole can be ensured, and the processing of the hole on the plane can be facilitated.

4. Finishing processing: finishing processing of the main surface (such as grinding, honing, precision grinding and rolling etc.), it should be carried out at the end of the process route, the surface finish after processing is above Ra0.8um, and the surface will be damaged by light and fine collisions;

In Japan, Germany and other countries, after finishing, it must be protected with flannel. It is absolutely not allowed to directly touch the workpiece with hands or other objects to avoid finishing the surface. damaged during transport and installation.

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