1.Using computer simulation and simulation system
With the development of computer technology and the continuous expansion of NC machining teaching, more and more NC machining simulation systems have been developed, and their functions are becoming more and more perfect. Therefore, it can be used in a preliminary inspection procedure to observe the movement of the tool to determine whether a collision is possible.
2 、 Using the analog display function of the CNC machining center
Generally more advanced CNC machining centers have graphic display functions. When the program is entered, the graphic simulation display function can be called to observe the tool’s movement trajectory in detail in order to check whether the tool may collide with the workpiece or fixture.
3.Using the dry running function of CNC machining center
The dry running function of the CNC machining center can be used to check the correctness of the cutting path. After the program is input into the CNC machining center, a tool or a workpiece can be installed. If you want to learn UG programming, you can get the introduction information in group 565120797, and then press the dry run button. At this time, the spindle does not rotate, and the table automatically runs according to the program track. Then you can find out whether the tool may collide with the workpiece or fixture. However, in this case, it must be ensured that the tool cannot be installed when the workpiece is installed; when the tool is installed, the workpiece cannot be installed, otherwise collision will occur.
4.Using the lock function of CNC machining center
General CNC machining centers have a lock function (full lock or single axis lock). When the program is entered, the Z axis is locked, and whether the collision will occur can be judged by the Z axis coordinate value. The application of this function should avoid operation such as tool change, otherwise the program cannot be passed.
5.The setting of coordinate system and cutter compensation must be correct
When starting the CNC machining center, be sure to set the CNC machining center reference point. The working coordinate system of the CNC machining center should be consistent with the programming, especially in the Z axis direction. If the error occurs, the possibility of the milling cutter and the workpiece colliding is very large. In addition, the setting of the tool length compensation must be correct, otherwise, either the machining is empty or a collision occurs.
- Improve programming skills
Programming is a vital part of NC machining. Improving programming skills can largely avoid unnecessary collisions.
For example, when milling the inner cavity of the workpiece, when the milling is completed, the milling cutter needs to be quickly retracted to 100mm above the workpiece. If it is programmed with N50 G00 X0 Y0 Z100, then the CNC machining center will be linked with three axes, and the milling cutter may be connected to the workpiece. If a collision occurs, the tool and the workpiece are damaged, which seriously affects the accuracy of the CNC machining center. At this time, the following programs can be used: N40 G00 Z100; N50 X0 Y0; that is, the tool retracts to 100mm above the workpiece first, and then returns to the programmed zero point. collision.
In short, mastering the programming skills of machining centers can better improve machining efficiency and machining quality, and avoid unnecessary errors in machining. This requires us to continually sum up experience and improve in practice, so as to further strengthen programming and processing capabilities