CNC machining center machining process, there is a vital point, that is, in the preparation of the program and operation of the processing, must avoid making CNC machining center collision. Because CNC machining centers are very expensive, maintenance is difficult and expensive. However, the occurrence of collision is a certain rule to follow, is able to avoid, can be summarized as follows.

1, the use of computer simulation simulation system

With the development of computer technology, CNC machining teaching continues to expand, CNC machining simulation simulation system is more and more, its function is becoming more and more perfect. Therefore, it can be used for preliminary checking program, observe the movement of the tool to determine whether there is a possible collision.

2, the use of CNC machining center comes with the simulation display function

Generally more advanced CNC machining centers have graphic display functions. When the program is entered, you can call the graphical simulation display function to observe in detail the trajectory of the tool in order to check whether the tool and the workpiece or fixture may collide.

3, the use of CNC machining center empty run function

The use of CNC machining center empty run function can check the correctness of the tool path. When the program is entered into the CNC machining center, you can load the tool or workpiece, and then press the empty run button, at this time the spindle does not rotate, the table according to the program trajectory automatically run, at this time you can find out whether the tool may be with the workpiece or fixture collision. However, in this case it must be ensured that when there is a workpiece, can not load the tool; load the tool, it can not be loaded with the workpiece, otherwise there will be a collision.

4, the use of CNC machining center lock function

General CNC machining centers have a locking function (full lock or single-axis lock). When the input program, lock the Z-axis, the Z-axis coordinate value can be judged by the Z-axis of whether a collision will occur. The application of this function should avoid operations such as tool change, otherwise the program can not be made to pass.

5, coordinate system, tool complement must be set correctly

When starting the CNC machining center, must set the CNC machining center reference point. CNC machining center working coordinate system should be consistent with the programming, especially the Z-axis direction, if the error, the milling cutter and the workpiece collision possibility is very large. In addition, the tool length compensation must be set correctly, otherwise, either empty machining or collision occurs.

6, improve programming skills

Programming is a vital part of CNC machining, improve programming skills can largely avoid some unnecessary collisions.

For example, milling the inner cavity of the workpiece, when milling is completed, the milling cutter needs to be quickly returned to the workpiece above the 100mm, if programmed with N50 G00 X0 Y0 Z100, then the CNC machining center will be three-axis linkage, the milling cutter is likely to collide with the workpiece, resulting in damage to the tool and the workpiece, which seriously affects the accuracy of the CNC machining center, which can be programmed with the following program N40 G00 Z100 N50 X0 Y0; that is, the tool first back to 100mm above the workpiece, and then return to the zero point of the program, so there will be no collision.

In short, master the programming skills of machining centers, can better improve processing efficiency, processing quality, to avoid unnecessary errors in processing. This requires us to continue to summarize our experience in practice, and constantly improve, so that programming, processing capabilities to further strengthen.