Powerful manufacturers of automatic CNC Turning

Powerful manufacturers of automatic CNC Turning

Powerful manufacturers of automatic CNC Turning, CNC lathe processing and CNC Machining. Main products are: automotive parts, aviation plugs, turning parts, copper nuts, copper sleeves, nuts, transmission shafts, car charger parts, welcome to send drawings to process parts.

…………………………………………………..

Brief Analysis of Common Faults and Treatment of CNC Lathe

Simple CNC Machining, also known as economical CNC lathe, is developed on the basis of ordinary lathe. Its automatic control system is mainly composed of single-chip computer. Through the control program, the longitudinal and horizontal feeding device and tool changing device of the machine tool are controlled to automatically complete the processing of parts. Therefore, the simple NC lathe is still a mechatronics equipment, so when there are faults, it should be analyzed comprehensively from the mechanical structure and electrical control of the machine tool.

1. The step motor will not turn after the program runs.

This phenomenon is usually caused by the phase break of the stepping motor or its control system. It may be the fault of the stepping motor itself or the fault of its driving circuit. Firstly, check whether the connection plug of stepper motor is in good contact. If it is in good contact, the motor without fault can be replaced to verify whether the motor is in good condition. If the motor can not work properly after switching, the control part of the motor is abnormal. The high-power transistor on the drive board and the release diode of its protective element can be checked. Generally, these two elements are used.

2. Sudden stop of workbench during program running

This phenomenon is usually caused by mechanical faults, but it may also be caused by faults in the control system. At this time, the worktable can be returned to the origin and the processing program can be restarted. If the worktable always stops at a certain position, it should be damaged, deformed or stuck by foreign bodies in a certain part of the transmission system. First power off, then check whether the gap between the screw mother and the screw or the slide insert is too tight, whether there is foreign body in the ball guide groove of the ball screw, whether the screw has bending deformation, whether the flexible gear in the stepping motor reducer is loose or foreign body is stuck, etc. If there is no abnormality in manual turning, it is the fault of control system, which should be checked according to fault 1.

3. Stepping motor losing step at high speed

It may be that the voltage of the driving power decreases and the output torque of the stepping motor decreases. The driving power supply should be checked. When the high-voltage switch transistor is damaged, the high-voltage power supply is connected by the sky method. When the high-speed, the output torque of the stepper motor decreases and the step is lost. There may also be some mechanical failure, so we should also check the screw, screw mother, slide, stepping motor reducer and so on. When parts are bent, deformed or foreign bodies, the operating resistance will be increased. The phenomenon is not obvious at low speed, but it can not be completely overcome at high speed.

4. Tools do not return to zero at the end of program operation

Generally speaking, the control system fails. When the tool is being fed or processed, the stepping motor runs at a low speed, while when the program returns to zero, it requires a quick return. Stepper motor runs at high speed and uses high voltage driving power supply to increase the output torque. There is a switch triode which controls the output of the high-voltage driving power supply. When the switch triode is damaged, the high-voltage power supply can not be opened when the high-speed return to zero, and the output torque of the stepping motor is not enough, so that the tool does not return to zero. The switch triode can be replaced to eliminate it.

5. Offside when tool returns to zero

Generally speaking, the operation resistance of mechanical transmission system is too large to cause. When cutting feed, the tool holder runs at low speed, drives at low voltage, and the stepping motor runs at low torque, which is insufficient to overcome resistance and cause step loss. When returning to zero, the stepper motor is driven by high voltage, which has high speed, high torque, no cutting resistance and no step loss. In this way, when you lose your step and return to normal, you will not return to zero. At this time, it can be checked whether there is iron chip foreign body on the transmission gear between stepping motor and screw, or whether the sliding plate insert is too tight to increase the running resistance, etc.

6. The dimension error of the workpiece after processing is very large.

One may be loose connection between screw or screw mother and lathe. There is no knife resistance during empty running, the slide is running normally, and the size of the workpiece drifts because of the increase of cutting resistance and the loosening of the connection between the screw or screw mother and the lathe. Tighten the connection, and the fault can be eliminated. Another possibility is the electric tool holder. If the tool holder can not be locked automatically, the tool will deviate from the processing point during cutting, which will also cause the above phenomenon. At this time, the tool holder locking device and the tool holder control box should be checked.

7. Large local size error of workpiece

The main reason is that the gap between the screw mother and the screw is too large. Because the screw mother and the screw run in a certain section for a long time, the gap of the section increases. At the beginning of the program, the measured clearance of the lead screw is compensated to the program, but it can not be compensated in the wear section, so that the part size of the workpiece is out of tolerance. The solution is to repair or replace the lead screw.

8. Electric tool holder can not be positioned and rotated continuously when changing tool

This is because when the program wants a tool, the electric tool holder is changing the tool. When the tool is rotated to the tool, there is no response signal, so that the tool holder can not rotate and locate. Hall elements on the electric tool holder should be inspected. When the Hall element is damaged, it will not check the signal output when the tool is in place, thus causing the above phenomenon. The Hall element of the knife can be replaced.

9. Return to monitor status and stop working during program execution

It is usually caused by malfunction of monitoring program or strong magnetic interference. The strong magnetic interference can be solved by grounding or shielding. If the program is not executed or started according to the execution instructions, it will return to the monitoring state immediately. Generally, if the monitoring program or computer hardware fails, suspicious chips can be replaced, such as off-chip program memory chips, programmable interface chips or microcontroller itself. Sometimes Out-of-chip data storage