What are the processing principles of precision machining? What are the safety precautions when performing precision machining?
Principles of precision machining
The following are the principles of precision machining, there are three specific points:
(1) In order to ensure the machining accuracy, it is best to carry out rough and finish machining separately. Because during rough machining, the cutting amount is large, the workpiece is subjected to large cutting force and clamping force, and a large amount of heat is generated. And the machined surface has obvious work hardening phenomenon, and there is a large internal stress inside the workpiece. If roughing and roughing are carried out continuously, the precision of the finished part will be quickly lost due to the redistribution of stress. For some parts that require high machining accuracy. After roughing and before finishing, a low-temperature annealing or aging treatment process should also be arranged to relieve internal stress.
(2) Reasonable selection of equipment. Rough machining is mainly to save most of the processing volume, and does not require high machining accuracy, so rough machining should be carried out on a machine tool with high power and low precision. The finishing process requires machining with higher precision machine tools. Roughing and finishing are processed on different machine tools, which can not only give full play to the capabilities of the equipment, but also prolong the service life of the precision machine tools.
(3) In the precision machining process route, the heat treatment process is often arranged. The location of the heat treatment process is arranged as follows: in order to improve the machining performance of the metal, such as annealing, normalizing, quenching and tempering, etc., it is generally arranged before precision machining. In order to eliminate internal stress, such as aging treatment, quenching and tempering treatment, etc., 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., it is generally arranged after precision machining. If there is a large deformation after heat treatment, the final processing procedure must also be arranged.
Safety precautions in precision machining
(1) Reduce walking back and forth and avoid unnecessary bending and tiptoe movements.
(2) The positioning is accurate and reliable to prevent errors caused by slight vibration.
(3) The movement direction of the operating parts of the machine tool and the movement direction of the operated parts must comply with the regulations, and there are simple symbols.
(4) Install the necessary interlocking mechanism to prevent the uncoordinated action of the operating parts and the uncoordinated accident when multiple people operate.
(5) The structure and arrangement of the handle, handwheel and button must comply with the regulations. The start button should be installed in the casing or a guard ring should be installed to prevent accidental activation. The handwheel and handle installed on the shaft will rotate with the shaft to hurt people during automatic feeding, so an automatic escape device should be installed.
Precision machinery parts manufacturer
Shanghai Blu-ray Precision Machinery Co., Ltd. is a company specializing in precision machining and manufacturing of parts. At present, the machining products involved are mainly processed by CNC numerical control machine tools. We have advanced processing technology, if you have related needs, you can visit our company's website to contact us.