In the process of precision mechanical parts processing, the machine is rotating very fast. If a link is found to be missing in the middle of the process, and the machine equipment is suddenly suspended, or the quality of the machined parts may be affected. Therefore, when the parts are precision processed, due to the many and precise processing procedures, there are many details that we cannot ignore in the process of precision mechanical parts processing. The following sections will give you a general introduction.
1. Separate fine and rough machining of parts to avoid affecting precision
When the parts need to be precision machined, due to the large cutting amount, the workpiece is subject to large cutting force and clamping force, generating a lot of heat. There is obvious work hardening phenomenon on the machined surface, and there is large internal stress in the workpiece. If rough machining is continued, the precision of the finished parts will be lost due to stress redistribution. For some parts with high machining accuracy, low temperature annealing and aging treatment shall be arranged after rough machining and before finishing to eliminate internal stress.
2. Select appropriate processing machines and equipment
Rough machining is mainly to cut off most of the machining allowance, and does not require high machining accuracy. Therefore, rough machining should be carried out on a machine tool with high power and low accuracy, while finishing requires a machine tool with high accuracy. Rough and finish machining are processed on different machine tools, which can not only give full play to the equipment capacity, but also extend the service life of precision machine tools.
3. Heat treatment process is required in the processing route
The heat treatment process is arranged as follows: In order to improve the metal cutting performance, such as annealing, normalizing, quenching and tempering, it is generally arranged before processing. In order to eliminate internal stress, such as aging treatment, quenching and tempering treatment, it is generally arranged after rough machining and before finishing. In order to improve the mechanical properties of parts, such as carburizing, quenching, tempering, etc., they are generally arranged after machining. In case of large deformation after heat treatment, the final processing procedure shall be arranged.
Details to be paid attention to in precision machining
1. In order to facilitate processing operations, it is necessary to reduce back and forth walking, and reduce or avoid bending and foot stepping of processing personnel.
2. The machined parts shall be positioned accurately to prevent vibration from affecting the production operation and avoid misoperation.
3. The moving direction of the working parts and the moving direction of the working parts of the machine tool shall comply with the regulations and be marked with simple symbols. The structure and layout of handles, hand wheels and buttons shall meet the requirements.
4. The start button shall be installed in an enclosure with a guard ring to prevent accidental contact. The handwheel and handle installed on the shaft rod will rotate with the shaft to hurt people during automatic feeding, so an automatic release device should be installed.