Mechanical gear transmission also has the disadvantages of complicated structure, inconvenient installation and maintenance adjustment, large working noise and large transmission error. The electronic gear transmission system that realizes the fixed speed ratio control overcomes the above-mentioned shortcomings of the mechanical device. Here, the independently driven rotary tool holder is used to realize the constant speed ratio control by the electronic gear box transmission. The so-called electronic gearbox is an electric drive system that can achieve accurate transmission of mechanical gears. Electronic gearbox drive system for polyhedral turning.
The workpiece rotation and the tool rotation are driven by independent motors. The workpiece is mounted on the spindle. The spindle motor drives the workpiece to rotate through the reduction gear. The tool is fixed on the rotary tool holder and driven by the servo motor 1. The gear ratio between the tool and the workpiece during machining is realized by a numerical control device. Both the main shaft and the servo motor shaft are equipped with photoelectric encoders. The output signal of the spindle rotary encoder is given as the input of the electronic gearbox. The inverter tests the output signal of the motor rotary encoder as the electronic gearbox. The feedback control signal is used, and the two signals are processed by the numerical control device to drive the servo unit as a control signal, so that the spindle speed and the tool speed are maintained in an accurate proportional relationship.
Rotary tool holder driven by electronic gearbox is fixed on the machine board. Due to the polygonal section of the electronic chart, the phase-locked loop of the electronic gearbox is schematic. The gearbox system is schematic. In order to achieve high-precision speed ratio control, the electronic gearbox The system is based on the principle of genlock, and the electronic gear function is realized by pulse frequency doubling.
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