Due to improper operation or programming error, it is easy to cause the tool or tool holder to hit the workpiece or the machine tool. Lighter parts will damage the tool and the machined parts. In severe cases, the machine tool parts will be damaged, and the machining accuracy of the machine tool will be lost or even caused. Personal accident. 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 reason for the collision is about 9 points.
(1) Errors in program preparation Errors in process planning, inconsistencies in process acceptance relationships, and incorrect parameter settings.
Example: A. Coordinates are set to zero at the end, but actually the top is 0;
B. The safety height is too low, resulting in the tool can not fully lift the workpiece;
C. The second open coarse margin is less than the previous one;
D. After the program is written, the path of the program should be analyzed and checked;
(2) Remarks on the procedure sheet: Example: A. One-sided touch number is written in four sides;
B. Vise holding distance or workpiece protruding distance is incorrectly marked;
C. Tool extension length Remarks A collision is caused when the tool is not known or is in error;
D. Procedures should be as detailed as possible;
E. The principle of the new replacement should be adopted when the procedure is changed: The old procedure should be destroyed.
(3) Example of tool measurement error: A. The tool input data does not consider the tool holder;
B. The cutter is too short;
C. To use a scientific method for tool measurement, use as accurate a tool as possible;
D. The length of the tool is 2-5mm longer than the actual depth.
(4) program transfer error program call error or program modification, but still use the old program for processing;
The on-site processor must check the detailed data of the program before processing;
For example, the time and date of program writing and simulation with the bear family.
(5) Tool selection error
(6) Blank exceeds expectations, oversize blank does not match programmed blanks
(7) The workpiece material itself is defective or has too high hardness
(8) Clamping factors, pad interference and not considered in the program
(9) Failure of machine tool, sudden power failure, lightning strike resulting in collision with a knife, etc.
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, reducing the machine tool collision phenomenon. With the development of technology, advanced technologies such as tool damage detection, machine tool anti-collision detection, and self-adaptive machining of the machine tools have emerged, which can better protect CNC machine tools.
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