According to the manufacturer of deep-hole drilling machine, in the typical second-order system, the damping coefficient X = 1/2 (kt) - 1/2, the steady-state error E () = 1/k, where k is an open-loop amplification factor, which is often called open-loop gain in engineering. Obviously, the open-loop magnification of the system is one of the important parameters that affect the static and dynamic performance of the servo system. Generally, the magnification of servo mechanism of deep hole drilling machine is 20-30 (1/s). Servo systems with K < 20 range are usually referred to as low magnification or soft servo systems, which are mostly used for point control. The system with k > 20 is called high magnification or hard servo system, which is applied to contour processing system.
If the step response does not oscillate in order to avoid affecting the surface roughness and accuracy of the machined parts, it is required that the value of the step response be larger and the open-loop amplification factor K be smaller. If we start from the rapidity of the system, we hope that the open-loop amplification factor will be smaller, that is, we hope that the open-loop amplification factor will be increased, and the steady-state accuracy of the system will be improved with the increase of K value.
Therefore, the selection of K value must be considered comprehensively. In other words, the higher the magnification of the system, the better. When the input speed changes abruptly, the high amplification factor may lead to drastic changes in output. Mechanical devices will be impacted greatly, and some may also cause stability problems of the system. This is because the stability of high order systems requires a range of values of K. Low magnification system also has some advantages, such as easy adjustment, simple structure, insensitive to disturbance, and good surface roughness.
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