Open-loop control, although the modification cost is low, but many times the modified machine tool processing accuracy is low, lost the meaning of modification; closed-loop control, although the processing accuracy is high, but the modification cost is too high. The semi-closed loop control, the modification cost is not too high, and at the same time can meet the processing requirements of general parts, so the general modified machine tools use semi-closed loop control. The design of the servo drive system adopts the semi-closed loop control mode, and the drive component selects the AC servo motor and is equipped with an appropriate power amplifier device, which constitutes the servo drive system. The load inertia is calculated to achieve the purpose of reducing the load inertia, and the lathe control system uses a speed reduction mechanism in the Z-axis feed mode.
However, the stiffness value is too many factors involved, so it is difficult to carry out accurate calculations. The factors involved include the rigidity of the parts such as the support base, the intermediate sleeve and the screw, and the contact stiffness between the parts and the base and the base. Contact stiffness and so on. Therefore, according to the accuracy requirements of the feed system, measures such as changing the support mode and improving the bearing rigidity are adopted in the structure to maximize the rigidity.
In the process of transforming the machine tool, it is necessary to carry out the adaptation and economic argumentation. After the argumentation, determine the object and technical requirements of the modification, then formulate technical measures and formulate the modification plan.
In short, the numerical control transformation of machine tools is one of the means of numerical control of processing equipment in China (especially in economically underdeveloped areas). In order to maximize the performance of the original machine tools, the design must be from the numerical control system, the main motion system, and the servo. The drive system, mechanical system and other aspects are repeatedly calculated and compared, so that economic requirements can be considered as much as possible while satisfying the processing accuracy.
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