Industry News

The influence of the process specification of precision parts processing on the quality of the workpiece

2022-08-27

Whether the machining process specification of the linear optical axis or precision axis parts processing is reasonable or not directly affects the quality, labor productivity and economic benefits of the workpiece. A part can be manufactured by several different processing methods, but under certain conditions, only one method is more reasonable. Therefore, when formulating process regulations, it is necessary to proceed from the actual situation, according to equipment conditions, production types and other specific conditions, try to use advanced processing methods to formulate reasonable process regulations.

The machining of shaft parts is the most basic and most important item for students to practice turning skills, but the quality of the final finished workpiece is always unsatisfactory. After analysis, the main reason is that the students’ process analysis for linear optical shaft parts is not reasonable enough.

In the process analysis of the parts diagram, it is necessary to understand the technical requirements of the part structure, accuracy, material, heat treatment, etc., and to study the product assembly drawing, component assembly drawing and acceptance criteria.

The processing route of carbon parts is generally: blanking → forging → normalizing → roughing → semi-finishing → carburizing → decarburization (for parts that do not need to increase the hardness) → quenching → threading, drilling or milling → roughing Grinding→low temperature aging→semi-finishing→low temperature aging→finishing.

Benchmark selection: The processing of precision parts should comply with the principle of coincidence of benchmarks, and select design benchmarks or assembly benchmarks as positioning benchmarks as much as possible. In line with the principle of unification of benchmarks. Use the same positioning datum for as many operations as possible. Make the positioning datum coincide with the measurement datum as much as possible. Select the surface with high precision, stable and reliable installation as the precision benchmark.

Benchmark selection: There are non-machined surfaces for precision parts processing, and the non-machined surfaces should be selected as rough benchmarks. For casting shafts that need to be machined on all surfaces, the surface alignment is based on the minimum machining allowance. And choose a flat and smooth surface, let the gate open. Choose a firm and reliable surface as the rough reference, and at the same time, the rough reference cannot be reused.