When the machining process is unruly, the first inspection of the workpiece should be carried out in a safe state, and it should not be pressed on the fixture. Therefore, the first part after the tool change and the fixture replacement should be the first inspection. In this way, for the tool setting parts of the jigs and other fixtures, drill sleeves, tool setting blocks, etc., the wear conditions should be checked before use, and the serious wear should be reported to the quality inspection and technical parts in time to better adopt the corresponding methods.
For some continuous machining processes or steps, in order to prevent them from being scrapped in batches, the operator should conduct self-inspection of the processes and steps. If necessary, people conduct mutual inspections or find an inspector to coordinate inspections.
When machining the internal and external threads of the car, the mouth end must be turned into a forming angle that is the same as the size of the pitch and the profile angle. The barb of the part should be completed by the operator in this process. The degree to which the practical values and ideal values of the diameter, length and surface distance of the machined parts are close to each other.
Scale accuracy is the effect of using scale public service to control. The standard service is the amount of change allowed by the part size in the cutting process. Therefore, under the same basic scale, the smaller the scale public service, the higher the actual scale accuracy.
Machining shape accuracy refers to the degree of fit between the actual shape and the ideal shape of the line and surface on the machined part. The azimuth accuracy of machining fits the practical and aspirational directions of points, lines and surfaces on the part. The project rules for actual appraisal of azimuth accuracy include parallelism, straightness, coaxiality, symmetry, circular runout, and full runout. Such azimuth accuracy is controlled by azimuth errors, and each intended azimuth service is divided into different accuracy levels.
The process rules for the production of precision parts are roughly as follows:
1. Machining process regulations are important technical documents guiding production:
Machining process regulations are determined by production verification based on process principles and process tests. They are the crystallization of science and technology and production experience, and are important documents that guide the production activities of enterprises. Because of this, the process regulations must be followed in production, otherwise it will often cause a serious drop in product quality, a significant reduction in productivity, and even waste products. However, the process regulations are not fixed, the process personnel should summarize the innovation and creation of the workers, and can according to the actual production situation, absorb the advanced process technology at home and abroad in time, and continuously improve and perfect the current process, but it must be Strict approval procedures.
2. Machining process regulations are the basis for production organization and production preparation:
The formulation of production plans, the supply of raw materials and blanks before the product is put into production, the design, manufacture and purchase of process equipment, the adjustment of machine tool loads, the arrangement of work plans, the organization of labor, the formulation of working hours quotas, and the accounting of costs are all based on Process regulations are the basic basis.
3. Machining process regulations are the technical basis for new and expanded factories (workshops):
When building and expanding a factory (workshop), the types, quantities and specifications of machine tools and other equipment required for production, the area of the workshop, the layout of the machine tools, the type of work, technical level and quantity of production workers, and the arrangement of auxiliary departments are all Based on the process regulations, it is determined according to the type of production. In addition, advanced process regulations also play a role in promoting and exchanging advanced experience. Typical process regulations can guide the production of similar products.