Matters needing attention in using CNC machine tools

Part of the operation data, setting data and processing program of CNC system is usually stored in RAM. After power failure, the system is maintained by backup battery or lithium battery of power supply. As a result, downtime is relatively long, and power or memory may be lost, and the system may not run. At the same time, because the CNC equipment uses three-phase AC 380V power supply, safety is also an important part of the pre installation of CNC equipment. Due to the above reasons, the power supply of CNC equipment has the following requirements: 1. The fluctuation of power grid voltage should be controlled between + 10% and 15%. However, the power supply in China fluctuates greatly with poor quality and hidden interference, such as high-frequency pulse and human factors (such as sudden power failure). During peak hours, such as about an hour before going to work during the day or at night, there are usually many differences, even up to ± 20%. The machine gives an alarm, can not work normally, damage the power system of the machine. It even leads to the loss of relevant parameter data. This phenomenon occurs in CNC machining centers or turning centers and other machine tools, the frequency is very high, should be taken seriously. It is suggested that AC regulated power supply system with automatic compensation and adjustment function should be equipped in the centralized workshop of CNC machine tools. Single CNC machine tool can be equipped with AC voltage regulator separately. Secondly, it is recommended that mechanical and electrical equipment be connected to a single power source. If it is necessary to use other power sources to supply power to some parts of electrical equipment (such as electronic circuit, electromagnetic clutch), these power sources should be removed from the equipment (such as transformer, sensor, etc.). Mechanical and electrical equipment. For large and complex machines, including many that work together in a coordinated manner and occupy a large space, more than one power supply may be required, depending on the configuration of the field power supply. Unless mechanical and electrical equipment is directly connected to the power supply through plug / socket, it is recommended to connect the power cord directly to the power terminal of the power disconnect switch. If this is not possible, a separate terminal block should be provided for the power cord. The handle of the power cut-off switch shall be easy to access and shall be installed between 0.6m and 1.9m above the easy to operate position. The recommended upper limit is 1.7m. In this way, the power can be cut off quickly in case of emergency, and the losses and casualties can be reduced. 3、 The requirements of CNC machine tools for compressed air supply system, CNC machine tools generally use a large number of pneumatic components, so the factory should connect a clean, dry compressed air supply system network. The flow and pressure should meet the requirements. The compressed air machine should be installed away from CNC machine. According to the layout of the plant and the amount of gas used, it should be considered to install chilled air in the compressed air supply system network of coal machine, air filter, gas storage tank, safety valve and other equipment. Daily maintenance of CNC machine tools for CNC machine tools, reasonable daily maintenance measures can effectively prevent and reduce the probability of failure of CNC machine tools. First of all, it is very important to establish operation rules, fault and maintenance files for specific performance and processing objectives of each machine. Including the maintenance contents and intervals of functional equipment and components. Secondly, the air of general workshop contains oil mist, dust and even metal powder. Once they fall on the printed circuit or electronic equipment in CNC system, it is easy to produce insulation resistance between components. Down, even components and printed circuits can be damaged. Therefore, unless necessary adjustment and repair must be carried out, it is generally not allowed to open the door at will, and it is not allowed to open the door during use. In addition, the grid voltage of the CNC system should be monitored from time to time. Once the normal working voltage is found, the system can not work normally, even the internal electronic components of the CNC system will be damaged. Therefore, in the case of equipment without automatic detection and protection, the distribution system should have a person responsible for monitoring and trying to improve the stability of the distribution system. Of course, it is very important for CNC vertical drilling machine to adopt DC feed servo drive and DC spindle servo drive. The brush must be removed from the DC motor to avoid commutator surface corrosion due to chemical corrosion. Performance damage, resulting in damage to the entire motor. This is a very serious and error prone mistake.