公开(公告)号：US3975607A

公开(公告)日：1976-08-17

申请号：US527889

申请日：1974-11-27

申请人： Werner Ullmann ,  Bernardo Ferroni ,  Renato Derighetti ,  Bernd Schumacher ,  Silvano Mattei ,  Costantino Tadini

发明人： Werner Ullmann ,  Bernardo Ferroni ,  Renato Derighetti ,  Bernd Schumacher ,  Silvano Mattei ,  Costantino Tadini

IPC分类号： B23H1/02 ,  B23H7/20 ,  B23P1/08

CPC分类号： B23H7/20

摘要： Two condition index variables are used for controlling operation in such a manner that one of the variables is kept as close as possible to a minimum value, while the other is held within an assigned range. Both condition index variables depend on the rate of flow of the flushing liquid through the working gap, on the interval between discharges in the gap or on the duty cycle or repetition frequency and amplitude of the discharge pulses. The condition index variable held to a minimum may be the integral of the square of the error signal from the regulating circuit of the electrode advancing drive, the integral of the square of the acceleration of electrode movement or the quotient obtained by dividing the square of the error signal by the square of the gap current. The regulating value to be held within an assigned range is a calculated breakdown potential defined by the relation of the variation of the error signal to the variation of the electrode spacing. The condition index variables are used to control the interval between discharges, the electrode spacing, the flow of flushing liquid, or other variables of the operation. Control of the flow of flushing liquid may be done directly where the liquid is supplied to the gap through holes in the workpiece or indirectly by intermittently backing off the electrodes to a controlled extent.

摘要翻译： 两个条件索引变量用于控制操作，使得变量之一保持尽可能靠近最小值，而另一个保持在指定范围内。 两个条件指标变量取决于冲洗液体通过工作间隙的流量，间隙中的排放间隔或占空比之间的间隔或排放脉冲的重复频率和振幅。 条件索引变量保持最小可以是来自电极前进驱动的调节电路的误差信号的平方的积分，电极移动的加速度的平方的积分或通过将电极移动的平方除以 误差信号由平方的间隙电流。 保持在指定范围内的调节值是由误差信号的变化与电极间隔的变化的关系定义的计算的击穿电位。 条件指数变量用于控制放电间隔，电极间距，冲洗液流量或其他操作变量。 冲洗液的流动的控制可以直接进行，其中液体通过工件中的孔被供应到间隙，或间接地通过间断地将电极退回到受控的程度。

公开(公告)号：US3973104A

公开(公告)日：1976-08-03

申请号：US492858

申请日：1974-07-29

申请人： Werner Ullmann ,  Bernardo Ferroni ,  Bernd Schumacher

发明人： Werner Ullmann ,  Bernardo Ferroni ,  Bernd Schumacher

IPC分类号： B23H7/18 ,  B23P1/08

CPC分类号： B23H7/18

摘要： The peak voltage of each discharge pulse is measured and, if the voltage of the pulse exceeds a high threshold value, there is also measured the time between the passing of that value and the moment the pulse voltage thereafter drops below a second lower threshold value. The two measurements are expressed in pulses that are combined, preferably by addition, to provide a regulating value, whose deviation ("error") from a standard value is predicted for a coming period, taking account of recent electrode position change as well as regulating value trend. The sign of the predicted error determines in which direction the electrode drive motor will be energized, but if the predicted error is less than a threshold value no motor energization occurs until the next error prediction. The sense in which the regulation operates is so defined that at a time when the electrodes are not already in relative movement an increase in the regulating value, at least if it persists, causes the electrodes to be moved closer together.

摘要翻译： 测量每个放电脉冲的峰值电压，并且如果脉冲的电压超过高阈值，则还测量该值的通过与此后脉冲电压下降到低于第二较低阈值的时刻之间的时间。 这两个测量值以组合脉冲的形式表示，优选通过加法来组合，以提供一个调节值，该调节值考虑到最近的电极位置变化以及调节 价值趋势。 预测误差的符号决定了电极驱动电动机将在哪个方向被激励，但是如果预测误差小于阈值，则直到下一个误差预测才会发生电机通电。 调节操作的感觉如此定义，使得在电极尚未相对运动的时候，调节值的增加至少如果持续，则使电极移动得更靠近在一起。

公开(公告)号：US4045641A

公开(公告)日：1977-08-30

申请号：US641241

申请日：1975-12-16

申请人： Werner Ullmann ,  Bernardo Ferroni ,  Gideon N. Levy

发明人： Werner Ullmann ,  Bernardo Ferroni ,  Gideon N. Levy

IPC分类号： B23H1/02 ,  B23H7/18 ,  B23P1/08

CPC分类号： B23H7/18

摘要： A control system, for a machine tool of the kind in which electrical energy passes across a gap between a tool electrode and a workpiece to erode the workpiece, comprises means for forming signals representative of the rate of erosion of the workpiece and the rate of undesirable erosion or "wear" of the tool electrode, and a computer means which receives the signals and combines them with a signal received from a data input device, which signal represents a desired optimum relationship between the two rates of erosion, and forms an appropriate output signal for controlling the machine tool. The data input device is usable, in rough machining operations where the tool electrode may be relatively cheaper than machine time, to ensure that machining is done in the shortest time by allowing a relatively high rate of tool wear and, in fine machining where the tool electrode is expensive, to ensure minimal tool wear at the cost of machine time.