In the machining process of the CNC machining center, it is important to avoid collisions between the CNC machining center when programming and operating the machining. Because the price of CNC machining center is very expensive, ranging from hundreds of thousands of yuan to millions of yuan, maintenance is difficult and expensive. However, the occurrence of collisions has certain rules to follow and can be avoided, which can be summarized as follows.
1. Utilize the analog display function of CNC machining center
Generally, more advanced CNC machining centers have graphic display functions. After inputting the program, you can call the graphic simulation display function to observe the movement track of the tool in detail, so as to check whether the tool may collide with the workpiece or fixture.
2. Using computer to simulate the simulation system
With the development of computer technology and the continuous expansion of CNC machining teaching, there are more and more CNC machining simulation simulation systems, and their functions are becoming more and more perfect. Therefore, it can be used in the preliminary inspection program to observe the movement of the tool to determine whether a collision is possible.
3. Utilize the locking function of CNC machining center
General CNC machining centers have a locking function (full lock or single-axis lock). After inputting the program, lock the Z-axis, and judge whether there will be a collision by the coordinate value of the Z-axis. The application of this function should avoid operations such as tool change, otherwise the program cannot be passed.
4. Utilize the dry running function of CNC machining center
The dry run function of the CNC machining center can be used to check the correctness of the tool path. After the program is input to the CNC machining center, you can install the tool or the workpiece. If you want to learn UG programming, you can get the introductory data in the group 565120797, and then press the dry run button. At this time, the spindle does not rotate, and the workbench automatically runs according to the program path. You can find out whether the tool is likely to 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 collisions will occur.
5. The coordinate system and tool compensation settings must be correct
When starting the CNC machining center, the CNC machining center reference point must be set. The working coordinate system of the CNC machining center should be consistent with the programming, especially the Z-axis direction. If there is an error, the possibility of the milling cutter colliding with the workpiece is very high. In addition, the setting of tool length compensation must be correct, otherwise, it is either empty machining or collision.
6, improve programming skills
Programming is a crucial part of CNC machining. Improving programming skills can avoid unnecessary collisions to a large extent.
For example, when milling the inner cavity of a workpiece, when the milling is completed, the milling cutter needs to be quickly retracted to 100mm above the workpiece. If N50 G00 X0 Y0 Z100 is used for programming, then the CNC machining center will move the three-axis linkage, and the milling cutter may be in contact with the workpiece. A collision will cause damage to the tool and the workpiece, which will seriously affect 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 first retracts to 100mm above the workpiece, and then returns to the programmed zero point, so that it will not 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 continue to sum up experience in practice and continue to improve, so as to further strengthen the programming and processing capabilities.