公开(公告)号：US4434346A

公开(公告)日：1984-02-28

申请号：US404326

申请日：1982-08-02

申请人： Roger J. Kern

发明人： Roger J. Kern

IPC分类号： B23H7/18 ,  B23P1/02

CPC分类号： B23H7/18

摘要： A method and apparatus for detecting the point of contact between a workpiece of electrically conductive material in a machine and an electrically conductive element movable relative to and insulated from the workpiece, such as the electrode of an electrical discharge machine, wherein in a time-varying signal, in particular sinusoidal, of predetermined amplitude and frequency is applied to the workpiece, a signal is derived from the conductive element or electrode resulting from the flow of current through the gap between the workpiece and conductive element in response to the applied signal, and the applied and derived signals are compared as to amplitude and phase angle. An indication of the comparison is provided with the result that the combination of an amplitude difference and a phase difference between the applied and derived signals indicates the status of the contact gap, respectively, between the workpiece and conductive element or electrode. The comparison and indication can be performed in an analog manner by means including a cathode ray tube providing a visual display of the amplitude and phase comparisons of the applied and derived signals as Lissajous patterns. The comparison and indication also can be performed in a digital manner by circuit means providing logical states indicating the results of the amplitude and phase comparisons of the signals, which logical states can be utilized to provide visual indications of the same.

摘要翻译： 一种用于检测机器中的导电材料的工件与能够相对于工件（例如放电机的电极）相对并且与其绝缘的导电元件之间的接触点的方法和装置，其中在时变 信号，特别是具有预定幅度和频率的正弦波被施加到工件，响应于施加的信号，从通过工件和导电元件之间的间隙的电流流动导致的导电元件或电极导出信号，以及 将应用和导出的信号与幅度和相位角进行比较。 提供比较的指示，其结果是施加的和得到的信号之间的振幅差和相位差的组合分别指示工件和导电元件或电极之间的接触间隙的状态。 可以通过包括阴极射线管的模拟方式来执行比较和指示，该阴极射线管提供所施加的和导出的信号的幅度和相位比较的视觉显示，如李萨如图。 比较和指示也可以以数字方式通过提供指示信号的幅度和相位比较的结果的逻辑状态的电路装置来执行，这些逻辑状态可以用于提供相同的视觉指示。