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AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsAkihiro Goto, Yoshio Ozaki, Atsushi Taneda, Tatsushi Sato, Yoshihito Imai
Estimating the term…
A method and apparatus for detecting and controlling the operation of an electric discharge machine for machining a workpiece. The machining is conducted by generating pulse discharges at a machining gap formed by a machining electrode and the workpiece opposed to each other. The alternating-current components or high frequency components of at least one of the current, voltage and impedance of the machining gap, the rectified components thereof, or amplitude, frequency or other signal characteristics thereof are detected and processed for control of the machining. The processing may include frequency analysis, pulse counting, threshold detection and the like using analog and digital processing.
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machine for machining a workpiece by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
An electrical discharge machining method for detecting the condition of machining a workpiece, said machining being conducted by generating pulse discharges at a machining gap formed by a machining electrode and said workpiece opposed to each other, comprising:
Dependencies are inferred from the claim text.
No related US applications are recorded in the indexed filing history.
Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges: detection of,…
Electric circuits specially adapted therefor, e.g. power supply: for preventing short circuits or other abnormal discharges by altering machining…
Working of metal by the action of a high concentration of electric
Term ended 5 Mar 2013 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to an electrical discharge machining method and an electrical discharge machine.
2. Description of the Background Art
FIG. 1 is an arrangement diagram illustrating a first embodiment of the invention.
FIG. 2 illustrates waveform diagrams of certain input/output signals in the main area of the first embodiment of the invention.
FIG. 3 is an arrangement diagram illustrating a second embodiment of the invention.
A first embodiment of the prevent invention will now be described with respect to FIG. 1, which is an arrangement diagram of an apparatus related to the present invention. Parts identical or corresponding to the conventional electrical discharge machine illustrated in FIG. 49 are given identical reference characters and will not be described here. In FIG. 1, the numeral 6 indicates a smoothing device, e.g., a smoother consisting of a resistor and a capacitor. FIG. 2 shows an input/output signal waveform example in the main area of the present embodiment, wherein waveform 2-A shows the voltage waveform of the machining gap, waveform 2-B shows the output waveform of the high-pass filter 4, waveform 2-C shows the output waveform of the rectifier 5, and waveform 2-D shows the output waveform of the smoother 6. A broken line shown in waveform 2-D indicates a judgement threshold value (a given set value). A discharge is normal if high frequency components are located above this threshold value, and is abnormal or is becoming abnormal if the high frequency components are located below the threshold value.
Operation will now be described with reference to FIGS. 1 and 2. A pulse-shaped voltage is applied to the machining gap by the machining power supply 1 to carry out electrical discharge machining. At this time, the voltage waveform 2-A of the machining gap is, for example, as shown in FIG. 2. From this voltage waveform, only high frequency components are fetched by the high-pass filter 4 and the waveform 2-B changes as shown in FIG. 2. They are then rectified by the rectifier 5 and change into a signal waveform 2-C as shown in FIG. 2, and subsequently, are smoothed by the smoother 6 and change into a signal waveform 2-D, as shown in FIG. 2. According to the level of this output, the display device 7 shows the discharge status.
When the high frequency components are rectified and then smoothed as described above, the magnitude of the high frequency components is provided as a voltage level, the variation of the discharge status output is prevented, and the discharge status can be detected accurately.