The work of CNC milling machine is an important condition for continuous improvement of functional efficiency and mold making and fine mold processing. With the advancement of driving skills and the presentation of structural innovations, many different types of CNC milling machines have excellent functions. The three-axis CNC milling machine presented in the mid-to-late 1990s has now developed into a five-axis CNC milling machine.
On the basis of traditional automatic tool changing equipment, the action speed is improved, or the organization and drive elements with faster action speed are selected. For example, ATC speed mechanical cam configurations are much higher than hydraulic and pneumatic configurations. The MC450 vertical machining center produced by Japan’s SODIC company is a fast tool changing device with a mechanical cam structure, and the tool changing time is only 0.6 seconds. According to the new structural characteristics of high-speed machine tools, the method and orientation of tool magazines and tool changing equipment are planned. For example, the tool magazine and tool changing equipment of traditional milling machines are mostly installed on one side of the column; while CNC milling machines are mostly the feed method of column movement to reduce the quality of moving parts, and the tool magazine and tool changing equipment should not be installed on the column. superior. Take a new approach to quickly swapping tools. Mode without magazines and robots, use other methods ATC instead. For example, without changing the tool, changing the spindle method. Using the feature of the newly developed CNC milling machine’s spindle components can do high-speed motion with degrees of freedom. In the process of directly participating in the tool-changing spindle, not only can the magazine configure a sensitive orientation, but also reduce the freedom of movement of the magazine, which significantly simplifies the magazine’s operation. Structure and tool change. Suitable for high-speed machining centers with tool holders. The light weight of the HSK tool holder and the short stroke of the gear shaper can improve the speed of the automatic tool change equipment. The use of HSK hollow short taper shank knives for fast and active tool changing equipment is the trend of development.
The reason for the movement of the spindle axis of the CNC milling machine
1. The axis movement of the spindle of the CNC milling machine cannot be ignored
The influence of the axis movement of the spindle on the processing has the following aspects: vibration will occur during milling, especially when milling with a face milling cutter on a vertical CNC milling machine; the surface roughness value will increase; The scale is not easy to control; it affects the flatness of the processed surface. The main reasons for the movement of the main shaft axis are as follows: the gap between the main shaft bearing and the main shaft is too large; the main shaft or the main shaft bearing is too worn; the quality of the end face of the inspection rod is poor, and the measuring head of the dial indicator does not touch the center of the end face of the inspection rod. Wait. Appropriate measures should be taken to solve it.
2. The end face circular runout of the support surface of the spindle shoulder of the CNC milling machine cannot be ignored
The influence of the end face circular runout of the bearing surface of the spindle shoulder of the CNC milling machine on the machining has the following aspects: the end face runout of the milling cutter with the positioning device on this surface will affect the service life of the tool; it will affect the accuracy and appearance of the workpiece surface. roughness. The main reasons for the out-of-tolerance end face circular runout of the spindle shoulder bearing surface of the CNC milling machine are as follows: the gap of the spindle bearing is too large; the use time of the spindle shoulder end face is too long and the wear is large; the spindle manufacturing accuracy is poor.
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