CNC machine tools can be adapted to the automatic machining of different parts. When changing the machined parts, it is only necessary to change the NC program without special machining equipment such as cams, masters, prototypes, or drill dies. It has the characteristics of high production efficiency, high processing precision and stable processing quality. The economical CNC machine tools are widely used in small and medium-sized enterprises because of low investment, quick effect and simple system structure. However, due to the limitations of CNC machine tools, especially the economical CNC machine tools are mostly modified by the CNC of the old ordinary machine tools, the machine tool has a high failure rate during use. According to statistics, CNC lathe failures mostly occur in electrical systems (27.74%) turret or tool holder (18.41%), CNC system (10.0%), chucks, fixtures and other machine tool accessories (10.02%), power supply (7.39%) , servo unit (6.35%) and other parts. It is obvious that among the components and subsystems of CNC machine tools, the most frequent fault is the machine tool electrical system. Some typical failure analysis of the machine tool electrical system during the use of CNC machine tools are summarized as follows: Next page
Plunger metering pump, is characterized by the plunger reciprocating motion, which means: the working chamber of the pump liquid end is caused from the plunger, the pump will reach the quantitative dosing through the plunger reciprocating motion, the accuracy of this dosing will be + 1%. The resistant piston in the heart of liquid end of a plunger pump is coated with stainless steel, the operation theory is: when the plunger is moved into the dosing head, the suction valve closes and the feed chemical flows out of the dosing head through a discharge valve. When the plunger moves in the opposite direction, the discharge valve closes due to the negative pressure in the dosing head. Fresh feed chemical flows through the suction valve into the dosing head. The plunger metering pump usually used in chemical and petrochemical, pharmaceutical, cosmetic and food production industry. However, there are different control types which make easy process integration.
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1 Typical Troubles occur <br> <br> Z-axis feed lost step or sudden stop producing faults with Jinan BKC2-â…¢ CNC System for a NC machine tools in the processing part, appear Z-axis stepper motor Occasionally, if there is a loss of step or a sudden stop of feed, and the Z-axis stepper motor runs dry, everything is normal. For this purpose, it is found that the control panel has no error information and no abnormal display when the Z direction is faulty, and it is preliminarily determined that the motherboard has no problem. Check the Z-axis drive part, the high-power tube, the corresponding circuit of the interface board, and find that the Z-axis always fails when it is processed to a position close to the spindle box. Therefore, it is estimated that the Z-axis electric machine of the numerical control system may be generated due to strong vibration when machining the workpiece. Some of the links are caused by poor contact. Carefully check the Z-axis control section and find that there is a root connection between the interface board and the drive board. The fault disappears after re-welding.
The X-direction feed rate suddenly becomes slower, and the control panel displays an abnormal fault. It is still a certain type of CNC machine equipped with the Jinan BKC2-III type CNC system. During the use, the feed rate suddenly becomes slower and the control panel displays. Abnormal fault. Because the control panel displays an abnormality, first check the motherboard. It is found that the CPU of the system is 280 chips, and all the integrated blocks of the motherboard are equipped with sockets instead of being directly soldered on the printed board. Therefore, it may be judged that there may be poor contact of electrical components. Phenomenon, the CPU, EPROM, RAM chip are re-plugged one by one. When the RAM chip is taken out and reinserted into the socket, the machine is found to be faulty.
The machine data and machining program lost after the shutdown. An imported Italian CNC milling machine equipped with the German HEIDENHAIN TNC155 CNC system. When used in winter in a certain year, the newly changed battery CNC system often shows the loss of machine data and machining program after shutdown. Sometimes, when the machine is in automatic machining, the program suddenly breaks and the CNC system crashes. After the winter, the fault naturally disappears. Later, as long as it is winter or rainy, the fault reappears and is very frequent. Sometimes the machine parameters are lost due to the shutdown, and the CNC system crashes when the data is re-entered. According to the analysis of the phenomenon that sometimes the power can be turned on and the fault occurs less frequently in summer, it is considered that this may be caused by poor contact of some connectors due to changes in temperature and humidity. We turned off all the interference sources that can cause interference, checked all the grounding wires and external plugs and found no problems. After opening the chassis, we found that one of the three boards plugged into the bus slot was bent due to moisture. Deformation, resulting in broken or poor contact of the printed circuit board. After the board is fixed and plugged in, the power failure test machine disappears.
Cause Analysis and Maintenance of Typical Faults of CNC Machine Tool Electrical System