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我国数控线切割机问世以来,数控部分采用复旦型逻辑电路,尽管各厂家生产的型号和规格逐年不同,但该数控电路至今仍被采用。该电路的控制精度为±1μ,有间隙补偿后的控制精度降低到±2μ以上;而它的加工范围只有最大加工圆弧半径的一半。为了适应数控线切割机向中大型和高精度方向发展的需要,如何进一步提高数控电路逻辑功能——扩大加工范围,提高精度和光洁度,是一个值得探讨的课题。本文对此课题进行了初步探索,提出了改革复旦电路的数学模型和控制方式,使加工范围扩大1倍,使精度(包括间隙补偿时)提高到1μ,同时提高了圆弧或斜线加工表面光洁度,使最大加工效率达到原来的2~(1/2)倍。全文包括:1.对“复旦”加工范围和控制精度的分析;2.扩大加工范围、提高精度和光洁度的途径;3.运算和进给方式的选择;4.逻辑电路设计;5.加工举例。
Since the advent of CNC cutting machine in our country, the CNC part adopts Fudan-type logic circuit. Although the types and specifications of the manufacturers vary from year to year, the NC circuit is still adopted till now. The control accuracy of the circuit is ± 1μ, the control precision with gap compensation is reduced to ± 2μ or more; and its processing range is only half of the maximum machining radius. In order to meet the need of NC WEDM to develop in large, medium and high precision, how to further improve the logic function of NC circuit - to expand the processing range and improve the accuracy and finish is a subject worth exploring. In this paper, the subject was initially explored, and the mathematical model and control method of Fudan circuit reform were put forward. The processing range was doubled and the accuracy (including gap compensation) was increased to 1μ. Meanwhile, the machining surface of circular arc or slash Finish, so that the maximum processing efficiency of the original 2 ~ (1/2) times. The full text includes: 1. Analysis of the processing scope and control precision of “Fudan University”; 2. ways to expand processing range, improve precision and finish; 3. choice of operation and feeding mode; 4. logic circuit design; .