
First of all, we should pay attention to improve the quality of heat treatment, reduce the content of Paralympics and residual internal stress and deformation caused by improper deformation, to avoid hardness exceeding HRC60, which will greatly reduce the grindability of carburized and quenched steel, especially avoid HRC62. Secondly, it is necessary to reduce the pre-machining errors of the gear teeth, reduce the tooth surface error of the prefabricated teeth, and avoid transmitting the position error to the tooth surface error due to the improper pitch circle after the prefabricated teeth. In addition, the following measures have been found in the process layout to reduce the sensitivity of grinding burns and cracks. The gears that are shot peened before grinding have a positive effect because of the high-speed shot peening that can offset the residual internal stress; heat treatment The workpiece with a relatively long post-aging time has a positive effect due to the full release of its residual internal stress; the constant temperature treatment before grinding is more positive, especially when the winter temperature is low.
Before gear grinding, improve the accuracy of gear alignment and increase the number of tooth shape, tooth direction and tooth groove during centering, and appropriately increase the machining allowance to avoid grinding burns and cracks caused by overcutting during rough grinding In the process of grinding, it is also necessary to monitor the current consumption of the grinding shaft and the change of the characteristic curve of the solid-side instrument in time to find grinding abnormalities and readjust various parameters; maintain a sufficient amount of grinding oil, appropriately reduce the oil temperature and Constant temperature control, pay attention to adjust the pressure and flushing position of the nozzle in time, NILES adds a back angle to improve the condition of grinding oil rushing in, these can all improve the distribution of grinding heat.
When grinding burns and cracks are found, first of all, the burned tooth surface should be manually roughened with coarse sand skin and the cracks should be filed with diamond to block the re-diffusion of cracks. Secondly, the grinding wheel and dressing parameters should be reselected. At the same time, the amount of knife eating should be reduced, the cutting speed and stroke speed should be appropriately reduced, the number of strokes and the number of cycle cycles should be reduced as much as possible, and the number of intermediate dressing intervals of the grinding wheel should be reduced for grinding treatment. Note that the pure grinding current should not exceed 10A during grinding. When the cracks and burns are repaired to be invisible to the eye, the common normal of the single tooth surface generally needs to be repaired at least about 0.03-0.1MM to truly repair the burns and cracks.
It is understood that the fully automatic saw blade grinding machine is computer controlled, the drive system has a high technical complexity, and the precision requirements of the mechanical part are also relatively high. Therefore, the operation, maintenance and management personnel of CNC machine tools are required to have a high cultural level and comprehensive technical quality.
The processing of CNC machine tools is carried out according to the program. When the shape of the part is simple, the program can be compiled manually. When the shape of the part is relatively complex, the programming workload is large, manual programming is difficult and often error-prone, therefore, a computer must be used for automatic programming.
Therefore, in addition to having certain process knowledge and operation experience of ordinary machine tools, the operators of automatic saw blade grinding machines should also have a very good understanding of the structural characteristics and working principles of CNC machine tools. Special training is provided in programming, and only after passing the assessment can the computer be operated.
Correct maintenance and effective repairs are also an important issue in the use of fully automatic saw blade grinding machines. The maintenance personnel of CNC machine tools should have high theoretical knowledge and maintenance technology, understand the mechanical structure of CNC machine tools, understand the electrical principles and electronic circuits of CNC machine tools, and should also have a wide range of machine, electricity, gas, and liquid professional knowledge.
Only in this way can a comprehensive analysis be performed to determine the root cause of the fault, correct maintenance, and ensure the good operating conditions of the fully automatic saw blade grinding machine. Therefore, CNC machine tool maintenance personnel and operators must be specially trained.
Gear grinding machine