Application of frequency conversion speed regulation technology on CNC internal grinding machine
The main shaft of the traditional grinding machine is directly started by the power frequency, and the main shaft grinding wheel motor works according to the traditional starting circuit. When the power grid voltage fluctuates, the spindle speed of the grinding wheel fluctuates to a certain extent, which affects the grinding accuracy of the workpiece. Therefore, considering the improvement of processing quality and efficiency, the application of frequency conversion speed regulation technology on CNC internal grinding machines can achieve satisfactory results, but general frequency converters are increasingly unsuitable for grinding processing requirements. Due to the harsh environment, the whole machine adopts a vector frequency converter with high performance, low torque, high torque and high protection level.
A grinder is a machine that grinds the surface of a workpiece with abrasive tools. Most grinding machines use a high-speed rotating grinding wheel to grind the workpiece. The high-speed rotating spindle is controlled by a frequency converter.
1. Low-frequency machining, high torque, and rough machining of grinding machines require low-speed operating frequency of the spindle and low-frequency operation of general-purpose inverters. The torque is not large and cannot be processed. Therefore, low-frequency control of the inverter is required. High torque characteristics.
2. The spindle runs with stepless speed regulation. The spindle adjusts different operating speeds according to the requirements of the workpiece, requiring the frequency converter to have unlimited speed regulation capability.
3. High precision running speed. The high-speed rotation accuracy of the spindle directly affects the accuracy of the grinding workpiece, so the drive frequency converter must have high speed accuracy.
4. High protection level. The processing environment of the grinding machine is in an environment with high oil pollution, high dust and high humidity, and the frequency converter is required to have a high protection level, otherwise it will cause short circuit damage or even explosion failure.
5. Small motor vibration and low noise.
According to the technical requirements of the grinding machine, the J600 series closed-loop vector frequency converter with high protection level is selected. The power of the frequency converter matches the power of the motor it drives. Sifang J600 series is a high protection level closed-loop vector inverter specially developed based on a new software and hardware platform. It has the characteristics of superior performance, compact structure, complete protection functions, flexible peripheral interfaces, and rich functions. It can adapt to various harsh environments such as humidity and dust, and can be used in various environments. Industrial application, flexible secondary development, depending on site conditions. Its CNC internal grinding machine has the following characteristics:
1. High and low frequency torque. The closed-loop vector zero speed can reach 200% of the starting torque, and the open-loop vector zero speed can reach 180% of the starting torque.
2. When working in high frequency mode, the maximum base frequency output is 1000.0Hz.
3. Built-in multi-system macro and application macro, which can be called through macro parameters to simplify parameter setting.
4. The priority of the frequency/speed setting channel can be flexibly configured.
5. Abundant alarm and protection functions
6. High IP54 protection level, can be used in harsh environments such as humidity and dust.
