Japan's HP-250 machine tool is a "one-axis five-knife" precision automatic machine tool. The date of manufacture was 1981. It has been more than 20 years since then. Some of the machines of this machine tool are still in good condition, but the electrical parts have been seriously aged and lagging, and some are important. The electrical specification cannot be used directly under our country's standard (if its motor voltage specification is three-phase 220V (60Hz), 200V (50Hz)). It requires a modern electrical transformation before it can continue to be used. Second, the transformation project The spindle of the machine tool is driven by a Mitsubishi Electric motor driven by a belt. The specification of Mitsubishi Electric is 1.5kW, three-phase 200V (50Hz, 60Hz), and 220V (60Hz). This voltage specification cannot be used with China's three-phase AC 380 (50Hz ) Match. The voltage needs to be converted to meet the motor specifications before it can be used. Now need to use 1.5kW inverter, convert single-phase 220V power into three-phase 200V power supply, and use the inverter to output the function of different frequency voltage to change the motor speed to achieve the purpose of controlling the spindle's high speed, medium speed and low speed. operating normally. The precision of this machine is 0.2mm The main equipment of the hydraulic system is two 0.4kW Mitsubishi electric motors. The two motors are simultaneously started/stopped and the supply voltage is three-phase 200V. Since the motor does not need to control the rotational speed, it is only necessary to use a transformer to change the local voltage to a voltage that meets the specifications of the motor. The Z-axis solenoid valve has been damaged during testing and needs to be replaced. The hydraulic seal has been used for a long time and needs to be replaced. The Y-axis and X-axis solenoid valves are good and the fan has good heat dissipation. The machine tool has five axial tools X1, X2, Z1, Z2, and Y. The five tools are driven by a solenoid valve. The solenoid's drive coil is AC200V. Each tool has a corresponding limit switch. There are also five tool speed knobs on the machine side to control the tool's movement speed. Only the solenoid valve and the three motors can operate normally, without any damage, to ensure the success of the electrical transformation of the machine. Third, the control system description The original control system of the machine tool has been seriously damaged and outdated. It needs to be completely replaced. It adopts a modern automatic control system and has certain advancement. The transformation uses PLC as the controller of the machine tool. The man-machine interface adopts Taiwan Welen touch screen. The machine console layout is as follows: The process setting interface on the touch screen is as above, and the operator can freely select the processing technology combination according to the needs of the processing workpiece, and the rotation speed of each step can also be set in advance on the touch screen, and each step can use different rotation speeds. To achieve the purpose of fine processing. The change of speed is achieved through the change of inverter output frequency. RS485 communication is adopted between PLC and inverter. LG-BUS (specific protocol of LG inverter) is adopted in internal protocol. The inverter supports special protocol and also supports MODBUS. Agreement, so it can also be developed using this kind of protocol. Since the PLC itself does not support LG, MODBUS protocol, it is necessary to use RS instruction programming in the PLC to achieve the purpose of communication with the inverter. We specialize in cable assembly overmolding. Our customized molded cables are built precisly following customers' spec.Experienced proposal can be offered to customers for evaluation by considering stable quality and competitive price.
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The control of the machine tool is divided into two modes: automatic and manual control. If it is manual, the operator controls the feed of the tool through Z1, Z2, X1, X2, and Y on the console. In automatic operation mode, these 5 knobs do not work. In the automatic operation mode, the "Automatic operation" button needs to be started, and the tool will perform the feed processing according to the program set on the touch screen. Rapid forward/increase and spindle high/low speed of the tool are manually set by the "feedrate" and "spindle run" knobs. When "spindle mode" is linked, simply press "spindle start" and the spindle will run. In single-action mode, the spindle will only run when the “spindle start†button is pressed. When this button is released, the spindle will stop. "Hydraulic start" starts the hydraulic pump and the cooling fan. "Emergency stop" is to stop the spindle operation and the hydraulic pump. Press the reset button and all tools will return to the limit switch position.
Japanese HP-250 Machine Tool Control System Transformation
I. Overview