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Causes of tool collision failure in CNC turning-milling compound machine tools

Compared with ordinary machine tools, CNC turning-milling compound machine tools have high machining accuracy, good dimensional stability, low labor intensity, and convenient modern management. However, due to improper operation or programming errors, it is easy to cause the tool or tool holder to hit the workpiece or the machine tool, the lighter will damage the tool and the processed parts, and the severer will damage the machine components, making the CNC turning and milling composite machine tool processing. Loss of accuracy, even causing personal accidents. The following are the main reasons for tool collision failure of CNC turning-milling compound machine tools:

1. The simulation processing machine is not locked
Since the CNC turning-milling compound machine tool is locked by software, it is impossible to visually see whether the machine tool is locked in the simulation interface when the automatic operation button is pressed during simulation processing. There is often no tool setting during simulation. If the machine tool is not locked and running, tool collision is very likely to occur. Therefore, you should go to the running interface to confirm whether the machine tool is locked before simulating processing.

2. Forgetting to turn off the dry run switch during processing
In order to save time during program simulation, the dry run switch is often turned on for the CNC turning-milling compound machine tool. Dry run means that all motion axes of the machine tool run at the speed of G00. If the dry run switch is not turned off during processing, the machine tool ignores the given feed rate and runs at the speed of G00, causing accidents of hitting the tool and hitting the machine tool.

3. No reference point return after dry run simulation
When the program is verified, the machine tool is locked and the tool is in the simulation operation relative to the workpiece processing (absolute coordinates and relative coordinates are changing). At this time, the coordinates do not match the actual position. The method of returning to the reference point must be used to ensure the machine The zero point coordinate is consistent with the absolute and relative coordinates. If no problems are found after the program is checked, the machining operation will be carried out, which will cause tool collisions.

4. The direction of overtravel release is wrong
When the turning and milling compound machine tool is overtravel, you should press the overtravel release button and move it in the opposite direction manually or manually to eliminate it. However, if the direction of release is reversed, it will cause damage to the machine tool. Because when the overtravel release is pressed, the overtravel protection of the machine tool will not work, and the travel switch of the overtravel protection is already at the end of the travel. At this time, it may cause the workbench to continue to move in the overtravel direction, eventually pulling the lead screw and causing damage to the machine.

5. Inappropriate cursor position during specified runtime
When specifying the operation, it is often executed downward from the cursor position. For the lathe, it is necessary to call the tool offset value of the used tool. If the tool is not called, the tool of the running program segment may not be the desired tool, and it is very likely that the tool collision accident may occur due to different tools. Of course, the coordinate system such as G54 and the length compensation value of the tool must be called first on the machining center and CNC milling machine. Because the length compensation value of each tool is different, it may cause tool collision if it is not called.

As a high-precision machine tool, the CNC turning and milling compound machine tool is very necessary to avoid collisions. The operator is required to develop the habit of being careful, careful, and operating the machine in the correct way to reduce the occurrence of machine tool collision.

Related knowledge: CNC turning and milling center tool library, CNC turning and milling center

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