In the machining process of the CNC machining center, one thing is very important, that is, when programming and operating processing, we must avoid collisions with the CNC machining center. Because the price of CNC machining centers 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. The following are five points for everyone. I hope everyone will collect them well.
With the development of computer technology and the continuous expansion of CNC machining teaching, 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.
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.
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, and then press the dry run button. At this time, the spindle does not rotate, and the worktable runs automatically 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 is necessary to ensure 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.
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.
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. 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 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 points. collision.
In short, mastering the programming skills of machining centers can better improve machining efficiency and machining quality, and avoid unnecessary errors in machining.