Some small skills of CNC machining programming, learn to be useful!

　　 In the machining process of CNC machining center, one thing is very important, that is, when programming and operating processing, we must avoid collision of CNC machining center. Because the price of CNC machining center is very expensive, ranging from several hundred thousand yuan to as many as 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. Using computer simulation simulation system

　　 With the development of computer technology and the continuous expansion of the teaching of CNC machining, there are more and more CNC machining 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.

　　2, use the analog display function of the 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 to check whether the tool may collide with the workpiece or fixture.

　　3. Use the dry run function of CNC machining center

　　Using the dry run function of the CNC machining center, the correctness of the tool path can be checked. After the program is input to the CNC machining center, you can install the tool or the workpiece, and then press the dry run button. At this time, the spindle does not rotate, and the worktable automatically runs according to the program path. At this time, you can find out whether the tool may be related to the workpiece or fixture. bump. 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.

　　4. Use the lock function of CNC machining center

　　The general CNC machining center has a lock 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.

　　5. The coordinate system and tool offset 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 interact with the workpiece. When 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 program 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. collision.