Several problems affecting the efficiency of CNC machine tools

Automatic CNC machine tools in the diagnosis and maintenance of mechanical faults, especially in the processing of quality problems, to a large extent, it may belong to the accuracy of the machine tool, so the detection of accuracy is very important. What are the problems that affect the efficiency of CNC automatic lathes? Jingdun CNC machine tools simply analyze the following aspects.

The correct installation and debugging of automatic machine tool equipment is the primary condition to ensure the good use of machine tools and give full play to its benefits. CNC automatic lathe is a high-precision machine tool, due to the error of installation and debugging, often cause the loss of CNC automatic lathe accuracy, the increase of the failure rate, and therefore cause great attention.

When the electric tool holder changes the tool, the rotation is more than, can not be positioned, this is because when the program to a certain number of knives, the electric tool holder is turning to select the tool, when the rotation to the number of tools, there is no response signal, CNC automatic lathe so that the tool holder rotation is more than, can not be positioned. At this time, the Hall component on the electric tool holder should be checked. When the Hall component is damaged, there is no detection signal output when the CNC automatic lathe tool is in place, resulting in the above phenomenon. At this time, the Hall component of the knife can be replaced.

The local size error of the workpiece is large, and the phenomenon of CNC automatic lathes is mainly caused by the gap between the wire master and the lead screw. Because the lead screw and the lead screw run in a certain section for a long time, the gap of the section increases, the CNC automatic lathe at the beginning of the program, the measured lead screw gap is compensated to the program, but when the wear section cannot be compensated, the local size of the workpiece is out of balance. The solution is to repair or replace the lead screw.

After the program starts, the stepper motor does not shake, and the phenomenon of CNC automatic lathes is generally caused by the phase break of the stepper motor or its control system. There may be a fault in the stepper motor itself or a fault in its drive circuit. First check whether the connecting plug of the stepper motor is in good contact, if the connecting plug is in good contact, the CNC automatic lathe can then replace the fault-free one-phase motor, if the replacement motor runs normally, it indicates that the original stepper motor is faulty, if the CNC automatic lathe does not work normally after replacing the motor, it indicates that its control part is abnormal. It can focus on checking the high-power triode on the driver board and the protection element release diode, and under normal circumstances, the probability of damage to these two components is relatively large.

At the end of the program, the tool returns to less than zero, and the phenomenon of CNC automatic lathes is generally caused by the failure of the control system. The tool requires low speed operation in feed or processing, when the stepper motor running speed is low, the use of low-voltage power supply, and the program back to zero, the requirement of fast return, then the CNC automatic lathe requires the stepper motor to run at high speed, the use of high-voltage drive power, so that the output torque increases to ensure normal return to zero. There is a switching triode that controls the output of the high-voltage drive power supply. When the switching triode is damaged, the high-speed return to zero, the high-voltage power supply of the CNC automatic lathe can not be opened, and the output torque of the stepper motor is not enough, resulting in the loss of step back to zero, resulting in the tool returning to the origin. This fault can be eliminated by replacing the switch triode.

Everything is normal when the tool is empty, but the size error when the workpiece is processed is very large. One of the phenomena may be caused by the loose connection between the lead screw or the wire mother and the lathe part. There is no cutting resistance during idle time, and the slide of CNC automatic lathe runs normally. When machining the workpiece, due to the increase of cutting resistance, the connection between the lead screw or the wire mother and the lathe is loose, resulting in the size drift of the machining workpiece. Faults can be eliminated by firmly connecting parts. Another possibility is caused by an electric knife holder. If the tool holder cannot be automatically locked after changing the tool, the tool will deviate from the processing point when eating the tool, which will also cause the above phenomenon. At this time, the tool holder locking device and tool holder control box should be checked.

CNC automatic lathe unpacking is simple, as long as the CNC automatic lathe arrives, the first should be unpacking inspection, to see if there is any damage to the appearance, in the case of ensuring that there is no damage to the transport, according to the packing list listed in the attachment box to count each item, if there is a non-conforming place should notify the supplier in time. According to the unpacking situation, if the CNC automatic lathe has a machine tool for installing anchor bolts and foundation requirements, the concrete machine tool and anchor bolts should be cast in accordance with the requirements of the machine tool installation instructions, and the power outlet hole should be done, and the machine tool should be grounded. Generally, machine tools are equipped with adjusting pads to adjust the machine level.