How to avoid CNC machine collision during processing?
CNC machining center in the process of processing, one point is very important, that is, in the programming and operation of processing, we must avoid the CNC machining center collision. Because the price of CNC machining center is very expensive, at least hundreds of thousands of yuan or more than millions of yuan, maintenance is difficult and high cost. However, the occurrence of collision has certain rules to follow and can be avoided, which can be summarized as the following points.
1. Using computer simulation system
With the development of computer technology and the continuous expansion of NC machining teaching, there are more and more NC machining simulation systems and their functions are becoming more and more perfect.It can therefore be used in a preliminary inspection procedure to observe the movement of the tool to determine whether a collision is possible.
2. Using CNC machining center with its own simulation display function
Generally more advanced CNC machining center has a graphic display function.When the input program, you can call the graphic simulation display function, detailed observation of the tool trajectory, in order to check whether there is a possible collision between the tool and the workpiece or fixture.
3. Using CNC machining center empty operation function
The empty running function of CNC machining center can be used to check the correctness of the tool path.When the program into the CNC machining center, can be installed on the tool or workpiece, and then press the empty operation button, at this time the spindle does not turn, the work table according to the program track automatic operation, at this time can be found whether the tool is likely to touch the workpiece or fixture.However, in this case, it is necessary to ensure that the workpiece can not be installed with the cutter;When the tool is installed, the workpiece cannot be installed, otherwise the collision will occur.
4. Using CNC machining center lock function
The general CNC machining center has a lock function (full lock or single axle lock).When the program is entered, the Z axis is locked, and the coordinate value of the Z axis can be used to determine whether a collision will occur.The application of this function should avoid knife change and other operations, otherwise the program cannot be passed.
5. The setting of coordinate system and tool complement must be correct
When starting the CNC machining center, it is necessary to set the CNC machining center reference point.CNC machining center work coordinate system should be consistent with the programming, especially the direction of the Z axis, if the error, the possibility of the milling cutter and the workpiece collision is very large.In addition, the tool length compensation must be set correctly, otherwise, either blank machining, or collision.
6. Improving programming skills
Programming is the most important part of NC machining. Improving programming skills can avoid some unnecessary collisions to a great extent.
Milling workpiece lumen, for example, when the milling is complete, need cutter fast back to 100 mm above the artifacts, if use N50 G00 X0 Y0 Z100 programming, then the three axes linkage CNC machining center, milling cutter is likely collision with the workpiece, the cutting tool and the workpiece damage, seriously affecting precision CNC processing center, then can use the following procedure N40 G00 Z100;N50 X0 Y0.That is, the tool first back to 100mm above the workpiece, and then back to the programming zero, so that there will be no collision.
In short, master the programming skills of machining center, can better improve the processing efficiency, processing quality, avoid unnecessary mistakes in processing.This needs us to summarize experience constantly in practice, and constantly improve, so that programming, processing ability to further strengthen.
