What are the operation precautions of CNC machining center?

After the workpiece is clamped in the machining center once, the numerical control system can control the machine tool to automatically select and replace the tool according to different processes, automatically change the auxiliary functions such as spindle speed, feed speed and the movement track of the tool relative to the workpiece, and complete the multi-process machining of multiple surfaces of the workpiece in turn, and has various functions of replacing or selecting the tool, which greatly improves the production efficiency. In the process of using CNC machining center, it is very important to avoid machine tool collision when programming and operating machining. The following introduces the safety operation precautions of CNC machining center:

A, the use of computer simulation system

With the development of computer technology and the continuous expansion of NC machining teaching, there are more and more NC machining simulation systems with more and more perfect functions. Therefore, it can be used to observe the movement of the tool in the preliminary inspection procedure to determine whether there is a possibility of collision.

Second, use the analog display function of the machine itself.

General advanced graphic display function of CNC machine tools. After inputting the program, you can call the graphic simulation display function to observe the tool trajectory in detail, so as to check whether the tool may collide with the workpiece or fixture.

Third, use the idling function of the machine tool.

Using the idling function of the machine tool can check the correctness of the tool path. When the program is input into the machine tool, you can install the tool or workpiece, and then press the idle key. At this time, the spindle does not rotate, and the workbench automatically runs according to the program trajectory. At this time, 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 installing the workpiece; When loading the tool, you can't load the workpiece, otherwise it will collide.

Fourth, use the locking function of the machine tool.

Generally, CNC machine tools have locking function (full locking or single shaft locking). When the program enters, the Z-axis is locked, and whether a collision occurs can be judged by the coordinate values of the Z-axis. The application of this function should avoid such operations as tool changing, otherwise the program will not pass.

Five, coordinate system, the knife setting must be correct.

When starting the machine tool, be sure to set the machine tool reference point. The working coordinate system of the machine tool should be consistent with the programming, especially in the Z axis direction. If there is an error, it is very likely that the milling cutter will collide with the workpiece. In addition, the setting of tool length compensation must be correct, otherwise it is either empty machining or collision.

Sixth, improve programming skills.

Programming is a crucial link in NC machining, and improving programming skills can avoid some unnecessary collisions to a great extent.

Seven, it is forbidden to use unqualified raw materials.

Machining center usually runs at high speed during operation, and unqualified workpiece raw materials, tools, fixtures and cutting oil will be broken and damaged during processing, thus causing safety accidents.

What problems should be paid attention to when operating CNC machining center? First of all, we need to have a comprehensive understanding of the CNC machining center, and then we should pay attention to the following aspects.

1. After the power is turned on, the machining center shall immediately check whether the switch button and indicator light are normal. If there is any abnormality, stop the machine immediately and report to the maintenance personnel.

2. Before formal machining, the coordinates of the machining center should be zeroed, and the machine can run after idling for more than 15 seconds.

3. In order to simplify the positioning and installation, the NC machining center has a relative machining origin, no positioning surface, and all have accurate coordinate dimensions.

4. During installation, ensure that the stroke of the machined workpiece is within the stroke range of the spindle.

5, when installing the workpiece, to ensure that the workpiece installation fastening, but also pay attention to not too tight and lead to the loss of positioning accuracy.

6. The flatness of the contact surface between the workpiece and the NC machining center should be above 0.02mm, and the surface finish should be above Ra 1.6.

7. When running in the machining center, remember not to put the head and other parts into the external protective cover of the machine to avoid accidents.

8. When the spindle is not positioned, it is not allowed to install and disassemble the tool, so as not to damage the spindle or affect the accuracy.

9. When installing large workpieces, be sure to handle them with care, so as not to knock against the workbench of CNC machining center.

10. Before leaving work every day, clean the machining center, wipe the fuselage with lubricating oil, and keep the external ground clean and tidy.

1 1, fill in the maintenance report, and do a good job of handover during the shift change.

In a word, mastering the programming skills of machining center can better improve the machining efficiency and quality and avoid unnecessary mistakes in machining.