Computer gong processing – machine failure

Fault analysis is the first step of machine tool maintenance. Through fault analysis, on the one hand, it can quickly find out the cause of the fault and eliminate the fault; at the same time, it can also play a role in preventing the occurrence and expansion of the fault. Generally speaking, the main methods of machine tool fault analysis are as follows:

Conventional analysis method conventional analysis method is a method of routine inspection on the mechanical, electrical, hydraulic and other parts of the machine tool, so as to determine the cause of the failure. On machine tools, conventional analytical methods usually include the following contents:

1) Check whether the specifications of power supply (including voltage, frequency, phase sequence, capacity, etc.) meet the requirements

2) Check whether the connection of CNC servo drive, spindle drive, motor and input / output signal is correct and reliable

3) Check whether the printed circuit board in CNC servo drive device is firmly installed and whether the connection part is loose

4) Check whether the setting end and potentiometer of CNC servo drive and spindle drive are correct

5) Check whether the oil pressure and air pressure of the hydraulic, pneumatic and lubricating parts meet the requirements of the machine tool

6) Check the electrical components and mechanical components for obvious damage, etc

The action analysis method is a method to determine the bad action position by observing and monitoring the actual action of the machine tool and trace the root cause of the fault. Generally speaking, the hydraulic and pneumatic control parts of the machine tool, such as: automatic tool change device, exchange table device, fixture and transmission device, can be determined by action diagnosis.

State analysis method state analysis method is a method to determine the cause of failure by monitoring the working state of the actuator. This method is most widely used in the process of machine tool maintenance. In modern CNC system, the main parameters of servo feed system, spindle drive system and power module can be tested dynamically and statically. These parameters include: input / output voltage, input / output current, given / actual speed, position, actual load condition, etc. In addition, the status of all input / output signals of CNC system, including internal relays and timers, can also be checked by the diagnostic parameters of CNC system. Through the state analysis method, the cause of failure can be quickly found out according to the internal state of the system without instruments and equipment. It is widely used in the process of machine tool maintenance, and the maintenance personnel must master it skillfully.

Operation and programming analysis method operation and programming analysis method is a method to confirm the fault cause through some special operation or compiling special test program section. For example, through manual single step to execute automatic tool change, automatic table exchange action, execute single function processing instructions and other methods to detect the action and function. By this method, the cause and components of the fault can be determined and the correctness of the program can be checked.

Self diagnosis of CNC system is a self diagnosis and testing method for the key hardware and control software of the system by using the internal self diagnosis program or special diagnosis software. It mainly includes boot self diagnosis, online monitoring and offline testing. Adjustment of machine tool accuracy and function,

1. Using precision level instrument and other detection tools, mainly by adjusting the pad iron way to fine adjust the level of the main bed of the computer gong processing machine tool, so that the geometric accuracy of the machine tool can reach the allowable tolerance range;
2. For the automatic tool change device, adjust the position of the tool magazine, manipulator, travel parameters, etc., and then check the action with the command, which is required to be accurate;
3. For the machine tool with APC automatic exchange table, after adjusting the relative position, carry out automatic load exchange;
4. After the adjustment of the machine tool, carefully check whether the parameter setting values in the numerical control system and the programmable controller conform to the data specified in the random index, and then test the main operation functions, safety measures, execution of common instructions, etc.