In the machining process of CNC small batch machining centers, there are many places to pay attention to, that is, when programming and operating the machining, it is necessary to avoid collision of the machining center. Because the price of CNC small batch processing centers is very expensive, ranging from a few hundred thousand yuan to more than one million yuan, it is difficult to repair and costly. However, the occurrence of collisions has certain rules to follow, which can be avoided, and can be summarized as follows.
1. Using the simulation display provided by CNC small batch machining center
Generally, the more advanced CNC small batch machining center has a graphic display function. After entering the program, you can call the graphic simulation display function to observe the movement path of the tool in detail to check whether the tool and the workpiece or fixture are likely to collide.
2. Using the empty operation of CNC small batch machining center
The correct operation of the path is checked by the dry run function of the CNC small batch machining center. After the program is input into the CNC small batch machining center, the tool or workpiece can be loaded, and then the dry run button is pressed. At this time, the spindle does not rotate, and the workbench automatically runs according to the program path. At this point, it can be found whether the tool is likely to be with the workpiece or The fixtures touch each other. However, in this case, it must be ensured that when the workpiece is mounted, the tool cannot be loaded, and when the tool is loaded, the workpiece cannot be loaded, otherwise collision will occur.
3. Using computer simulation system
With the development of computer technology, the teaching of CNC machining is constantly expanding, and more and more CNC machining simulation systems are being developed, and its 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 if it is possible to collide.
4. The coordinate system and tool compensation must be set correctly.
When starting the CNC small batch machining center, be sure to set the CNC small batch machining center reference point. The working coordinate system of the CNC small batch machining center should be consistent with the programming time, especially the Z axis direction. If there is an error, the possibility of the milling cutter colliding with the workpiece is very large. Also, the tool length compensation must be set correctly. Otherwise, it is either empty machining or collision.
5. Adopting the locking function of CNC small batch machining center
The usual CNC small batch machining centers have a locking function. When the program is input, 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 the operation of tool change, otherwise the program will not pass.
6. Improve programming skills
Programming is a crucial part of CNC machining. Improving programming skills can largely avoid unnecessary collisions.
For example, milling the inner cavity of the workpiece, when milling is completed, the milling cutter needs to be quickly retracted to 100mm above the workpiece. If programmed with N50 G00 X0 Y0 Z100, then the CNC small batch machining center will link the three axes, and the milling cutter may be Collision with the workpiece, causing damage to the tool and the workpiece, seriously affecting the accuracy of the CNC small batch machining center. At this time, the following program N40 G00 Z100; N50 X0 Y0 can be used; that is, the tool first retreats to 100mm above the workpiece, and then returns to the programmed zero point. This will not collide.
In short, mastering the programming skills of the machining center can better improve the processing efficiency and processing quality, and avoid unnecessary errors in the processing. This requires us to continuously sum up experience in practice and continuously improve, so that the programming and processing capabilities are further strengthened.