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Analysis Of 9 Reasons For Machining Center Knife

May 23, 2019

Recently, many customers at ALLES CNC are consulting about the machining center. For this reason, ALLES CNC employees and engineers summed up and found that many of the new and old customers are most likely to use the ALLES CNC machining center. The machining center hit the knife and the analysis was launched.


Compared with ordinary machine tools, CNC machining tools produced by ALLES CNC have high processing precision, good dimensional stability, low labor intensity and easy modern management. However, due to improper operation or programming errors, it is easy for the tool or the tool holder to hit the workpiece or the machine tool. The lighter will damage the tool and the machined part. If it is heavy, the machine tool will be damaged, and the machining accuracy of the machine tool will be lost. Causing a personal accident. Therefore, from the perspective of maintaining accuracy, the tool must not be allowed to collide with the machine tool or the workpiece in the use of the CNC machine. The following summarizes and analyzes the causes of the knife.


Analysis of 9 Reasons for Machining Center Knife

Cause Analysis

1. It is not confirmed whether the machine is locked.

Since the CNC machining center is locked by software, when the automatic operation button is pressed during simulation processing, it is not intuitive to see whether the machine is locked or not. There is often no tool setting during the simulation. If the machine is not locked, it is easy to hit the knife. Therefore, before the simulation processing, you should go to the operation interface to confirm whether the machine is locked. Forgot to turn off the dry run switch during machining.

2, did not check the dry run switch

Since the program is simulated, the dry run switch is often turned on to save time. Dry running means that all motion axes of the machine are running at G00. If the running time switch is not closed during machining, the machine ignores the given feedrate and runs at G00, causing a knife or machine crash. There is no reference point after the dry run simulation. When the program is verified, the machine tool is locked, and the tool is machined in the simulation operation (absolute coordinates and relative coordinates are changing). At this time, the coordinates do not match the actual position. The method of returning the reference point must be used to ensure the machine. The zero coordinate is consistent with the absolute and relative coordinates. If the machining operation is performed without finding a problem after the calibration procedure, the tool will collide.

3, the overtravel cancellation direction is wrong

When the machine overtravels, you should press and hold the overtravel release button and move it in the opposite direction by hand or hand, which can be eliminated. However, if the direction of the release is reversed, it will cause damage to the machine. Because the overtravel protection of the machine will not work when the overtravel is released, the overtravel protection travel switch is already at the end of the stroke. At this point, it is possible that the workbench will continue to move in the direction of the overtravel, eventually pulling the screw and causing damage to the machine. The cursor position is incorrect when the specified line is running. When the specified line runs, it is often executed downward from the cursor position. For the lathe, the tool offset value of the tool to be used needs to be called. If the tool is not called, the tool that runs the block may not be the desired tool, and it is very likely that the tool may be caused by a different tool. Of course, in the machining center, CNC milling machine must first call the coordinate system such as G54 and the length compensation value of the knife. Because the length compensation value of each knife is different, it may cause a collision if it is not called.

 

Sum up 9 reasons:

 

1, programming errors

 

2, the program single note error

 

3, tool measurement error

 

4, program transmission error

 

5, the choice of knife error

 

6. The blank exceeds expectations, the blank is too large and does not match the programmed blank.

 

7, the workpiece material itself is defective or too high hardness

 

8, clamping factors, block interference and not considered in the program

 

9, machine tool failure, sudden power failure, lightning strikes, etc.


As a high-precision machine tool, LLES CNC machining center CNC machine tool is very necessary for collision avoidance. It requires the operator to develop a careful and careful habit, operate the machine tool in the correct way, and reduce the occurrence of machine tool collision. With the development of technology, advanced technologies such as tool damage detection, machine tool anti-collision detection, and machine tool adaptive processing have emerged, which can better protect CNC machine tools.

ALLES CNC hopes that these will be helpful to ALLES CNC customers and to you in this article.



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