The processes that must be completed for internal thread milling include drilling and milling. This is somewhat similar to the traditional tap cutting internal thread processing method. The processing procedure of tap processing technical means is that in the process of processing, it is first necessary to determine the processing size of the thread bottom hole according to the inner diameter of the thread and the parameters of the workpiece, and then select the corresponding specifications of the tap to process the internal thread. Thanks to the vigorous promotion of CNC program-controlled equipment in the field of machinery manufacturing in recent years, thread milling technology has been widely used.
Tap processing methods can be divided into manual tapping and motorized tapping, in which in the case of manual tapping, not only the chip state is difficult to control, but also the chip discharge is difficult. In addition, if there is a problem in the manual operation process, it may lead to scratches on the machined surface. At the same time, there will be a situation that the thread hole diameter is too large or even the car is damaged in manual tapping, and the efficiency is relatively low. Motorized tapping is the use of CNC machine tools by workers to process parts, and the frequency is higher than that of other production methods. Compared with the manual tapping method, the disadvantages are undoubtedly revealed. On the numerical control device, the linear interpolation operation is generally used to control the relative movement of the milling cutter and the workpiece, so that their trajectory forms a thread, so that the machining can be completed smoothly. Due to the smaller size of the threaded milling cutter than the threaded hole, the situation is relatively optimistic in the milling process, so that the chip is discharged smoothly: in addition, the thread milling can process the threaded hole with a tooth height of more than one or even two times the height of the ordinary tapping, which is conducive to improving the various use performance of the internal thread.
When milling threads, there are also many problems, such as the mismatch between the speed and the amount of feed, the high pressure of the milling cutter due to low linear speed, and the bending and breaking of the tool due to excessive increase in the amount of cutting." Therefore, in the actual operation process, it is necessary to reasonably select the milling cutter tool and cutting parameters, so as to effectively control the size and quality accuracy of the threaded hole.