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A collection of CNC machining accidents, looking distressed

Source: Browse:16 The release date:2021.09.13 [ Large medium small ]

"A machining career that hasn't hit a machine is incomplete~" It's a joke. If programming or clamping errors are made, it can really lead to catastrophe. Today, the editor will let everyone look at the consequences of the collision and analyze the reasons for the collision, so as to avoid the losses caused by the collision in our work.


As a high-precision machine tool, the CNC machine tool of the CNC machining center is very necessary to avoid collisions. The operator is required to develop the habit of being careful, careful, and operating the machine according to the correct method to reduce the occurrence of machine tool collision. With the development of technology, advanced technologies such as tool damage detection during processing, machine tool anti-collision detection, and machine tool adaptive processing have emerged, which can better protect CNC machine tools.


To sum up 10 reasons:

(1) Machine operation error


A. Turn on the "Z-axis lock" button, and after the test run the program, turn off the Z-axis lock, and there is no three-axis return to the origin;

B. Tool setting is completed, the data is input to the coordinate system, and the selected workpiece coordinate system is inconsistent with the coordinate system in the program;


(2) Programming error

The process arrangement is wrong, the process acceptance relationship is not considered thoroughly, and the parameter setting is wrong.

Example: A. The coordinates are set to zero at the bottom, but the top is zero in practice;

B. The safety height is too low, causing the tool to be unable to lift the workpiece completely;

C. The margin for the second opening is less than that of the previous knife;

D. After the program is written, the path of the program should be analyzed and checked;


(3) The program list remarks are wrong


A. The number of unilateral bumps is written as four sides;

B. The clamp distance of the vise or the protrusion distance of the workpiece are marked incorrectly;

C. Unknown or wrong remarks of the tool extension length cause tool collision;

D. The program list should be as detailed as possible;

E. The principle of replacing the old with the new one should be adopted when the program list is changed: destroy the old program list.


(4) Tool measurement error


 A. Tool setting data input does not consider tool setting;

B. Tool loading is too short;

C. Use scientific methods for tool measurement, and use more accurate instruments as much as possible;

D. The length of the installed knife is 2-5mm longer than the actual depth.


(5) Program transmission error

The program number call is wrong or the program has been modified, but the old program is still used for processing;

The on-site processor must check the detailed data of the program before processing;

For example, the time and date when the program was written and simulated by the bear clan.


(6) Wrong tool selection

The selected tool does not match the material of the workpiece


(7) The blank exceeds expectations, and the blank is too large and does not match the blank set by the program


(8) The workpiece material itself is defective or the hardness is too high


(9) Clamping factor, spacer interference but not considered in the program


(10) Machine failure, sudden power failure, lightning strike, etc.