What factors causes the tools collision in CNC machining center and how to avoid it?

Parts machined by CNC machining center has the feature of high precision, good dimensional stability, low labor intensity. Due to improper operation or programming errors, it is not difficult for the workpiece or machine tool to be hit by the tool and the tool holder. This can damage parts, tools and others , and even cause personal accidents. Therefore, in order to maintain accuracy, no tool collision is allowed when machining parts with CNC machining centers. In order to reduce unnecessary losses in the future processing work, we will talk about the CNC machining center tool collision causes.

Common errors and avoidance methods of tool collision in CNC machining center

As a CNC machining LTD, we have a number of CNC machines to carry out custom machining services and produce custom machined parts. During the process of machining, there exist tool collisions.

What is the major cause of tool collisions? How to avoid it?

• 1. Not sure whether the machine is locked

  Because the locking of the CNC  turning and milling center is done by software, when the automatic operation button is pressed, it is not direct to notice whether the machine is locked in the simulation interface. Tool setting is usually not performed during simulated machining. If the machine is neglected to lock, it is difficult to avoid the collision of the machine. So before the simulation processing, to enter the operation interface in advance, confirm whether the machine is locked.

• 2. The idle switch is not turned off during the processing

  In the process of program simulation, in order to save time, often open the idle switch. If the operation switch is not turned off in the processing time and space, and still runs at the speed of G00, the machine tool ignores the given feed speed at the same time, resulting in tool impact and machine collision accidents.

• 3. Do not  returned to the reference point after the simulation 

  While checking the program, although the machine is locked, the tool is running in the simulation relative to the workpiece, and the coordinates are not consistent with the actual position, so it is easy to hit the tool. Therefore, the method of returning reference points must be adopted to ensure that the mechanical zero coordinates are consistent with the absolute and relative coordinates. If the problem is not found after a review of the program, the tool will collide.

• 4. The direction of overtravel is wrong

  When the machine of hi tech CNC technologies is overtravel, press the overtravel release button to move manually or in the opposite direction. However, if the disassembly is in the opposite direction, the machine will be damaged. The reason is that when the overtravel release is pressed, the overtravel protection of the machine tool stops working, and the travel switch of the override protection is already at the end of the travel. However, this may cause the table to continue to move in the direction of overstroke, and eventually the screw will be pulled up and the machine will be damaged.

• 5. The cursor position of the special line is incorrect

  When the specified row runs, it typically executes the following program based on the cursor position. For lathes, you need to call the tool offset value used. If you do not, the tool used to run the program segment may be other than the one you need, so you may not be able to avoid tool conflicts due to different tools. Therefore, in the machining center, the CNC milling machine must first call the coordinate system and tool length compensation value to avoid tool collision.

• 6, the operator in the operation of CNC lathe processing workpiece, workpiece size accuracy will be directly affected by the tool error and tool wear, so it is necessary to compensate for the tool. Attention should be paid to the direction and amount of compensation when tool compensation. Check tool compensation value regularly. When the tool compensation value is input, if the output of "+" is "1" and the input of "X0.08" is "X8", the tool may directly rush into the workpiece or chuck after executing the program, resulting in workpiece scrap, tool damage, chuck collision and other accidents.

These are the reasons why CNC machining center tools often collide. Hopefully, your understanding of this article will help you avoid tool collisions in NC machining centers. With the continuous development of science and technology and the emergence of new detection methods, CNC machine tools will be better protected.