Analysis of Causes of Crash Knife Failure in CNC Machining Center

Relative to the ordinary machine tool CNC machining center CNC machine tools with high accuracy, dimensional stability, low labor intensity, easy 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 light will crash the tool and the machined part. In severe cases, the machine tool component will be damaged and the machining accuracy of the machine tool will be lost. Personal injury. Therefore, from the standpoint of maintaining accuracy, the tool and the machine tool or the workpiece must not be collided in the use of the CNC machine tool. The following is a summary and analysis of the causes of collision.

Because the CNC machining center is locked by software, when the automatic operation button is pressed in the simulation processing, it is not possible to intuitively see whether the machine tool is locked in the simulation interface. In the simulation, there is often no tool setting. If the machine tool is not locked, the collision tool can easily occur. Therefore, before the simulation processing, you should check the machine's lock to the operation interface. Forgot to close the empty running switch during processing. Due to the time saved in the program simulation, the empty running switch is often turned on. Empty operation means that all the machine axes of the machine run at G00 speed. If the processing time switch is not closed, the machine ignores the given feedrate and runs at the speed of G00, resulting in a knife or machine accident. No reference point was returned after the air-to-air simulation. During the verification procedure, the machine tool is locked and the tool is processed relative to the workpiece in the simulation operation (absolute coordinates and relative coordinates are changing). At this time, the coordinates are not consistent with the actual position. The method of returning the reference point must be used to ensure the machinery. Zero coordinates are consistent with absolute and relative coordinates. If a machining operation is not found after checking the program, a tool collision will occur. The direction of overreach is not correct.

When the machine tool is overtravel, you should press and hold the overtravel release button and move it in the opposite direction manually or by hand to eliminate it. However, if the direction of removal is reversed, the machine tool will be damaged. Because when the overtravel is released, the overtravel protection of the machine will not work, and the overtravel protection switch is already at the end of the trip. At this point, the worktable may continue to move in the direction of overtravel, eventually causing the screw to be broken, causing damage to the machine tool. The cursor position was incorrect when the specified line was run. When the specified line is run, it is often performed 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 to run the program may not be the desired tool, which may cause a collision accident due to different tools. Of course, in the machining center and CNC milling machine, we must first call the coordinate system such as G54 and the length compensation value of the tool. Because each blade has a different length compensation value, it may cause a collision if it is not called.

CNC machining center CNC machine tools as high-precision machine tools, collision avoidance is very necessary, requiring operators to develop a careful and careful habits, according to the correct method of operating the machine tool, reducing the collision of the machine tool. With the development of technology, advanced technologies such as tool damage detection, machine tool anti-collision detection, and self-adaptive machining of machine tools have emerged, which can better protect CNC machine tools.

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