JPH0418736Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application This invention relates to an electric discharge machine equipped with a gap state indicator.

b. Prior art The display device for displaying the machining condition of an electric discharge machine is usually an analog indicator, a digital indicator, or a CRT.
etc., and is attached to a control device separate from the main body of the machine for reasons such as insulation. If the display and the processing work area are far apart, workers may forget that voltage is being applied between the poles and carry out positioning work, leading to accidents such as electric shock. Sometimes. Also, when the operator compares and monitors the machining status and the display on the display during machining,
It is more convenient if the processing work place and the display are close together. Further, if the display device is complicated, there is a risk that in the event of a failure, the operator may not notice this and may receive an electric shock by contacting the electrodes or the like.

c. Problems to be solved by the invention As mentioned above, the indicator for the machining state of conventional electrical discharge machines is located far from the machining work area, so workers may forget to read the display or may not notice it, resulting in electric shock. There was an accident like that, and it was inconvenient. This invention was devised in order to improve such dangers and inconveniences, and the purpose is to provide an indicator that is installed close to the processing work place and that easily and accurately displays the machining gap condition. That is.

d. Means for Solving the Problems In order to achieve the above object, the present invention provides an electric discharge machine with an electric discharge machine that has an electric discharge machine with an upper nozzle section that also serves as an electrode guide section and an arm that supports this upper nozzle section at its tip. A plurality of constant voltage diodes each having a different Zener voltage are connected in parallel, and a pole-to-electrode state indicator is provided at the tip of the arm by connecting a plurality of constant voltage diodes with different color tones in series to each constant voltage diode. It is what it is.

e Effect With this structure, when a machining voltage is applied between the machining electrodes, the light emitting diode installed near the machining work area lights up, and the voltage is applied between the machining electrodes. Inform workers of this.
Therefore, it is possible to prevent a worker from inadvertently contacting the electrodes and receive an electric shock, and it is also easy to monitor the inter-electrode condition and compare it with the display.

f Example Next, an example of this invention will be described based on the drawings. FIG. 1 is a front view of the mechanical part of a wire-cut electric discharge machine implementing this invention. The mechanical section 1 is composed of a head 3, a column 5, an upper arm 7, a lower arm 9, a table 11, etc.
An upper nozzle section 13 and a lower nozzle section 15 are provided at the tips of the upper arm 7 and the lower arm 9 in an insulated manner, respectively, and these also serve as guide sections for the wire electrode.

A workpiece W is placed on the table 11 using a fixture 17, and the table 11 is moved freely in orthogonal X and Y axes directions by an NC device (not shown). Wire electrode 1 stretched between
9, it is processed into a predetermined shape. wire electrode 1
9 is supplied from the supply reel 21 as shown,
It passes through the upper nozzle section 13 and the lower nozzle section 15, and is then wound onto a take-up reel 23.

The electrode spacing state indicator 25 of this embodiment is provided in the upper nozzle section 13, and its outline is shown in FIG. That is, this indicator 25 has a resistor R and a light emitting device between the upper nozzle part 13 fixed to the tip of the upper arm 7 via an insulator 27 and the tip of the arm 7 (same potential as the workpiece). It is constructed by inserting diode LEDs in series.

With this structure, when voltage is applied between the electrodes (wire electrode and workpiece), the light emitting diode lights up to notify the operator that voltage is being applied, so the operator can This prevents you from inadvertently touching the discharge part and getting an electric shock.

As shown in Figure 3, the breakdown voltage (Zener voltage) is
By inserting 20V, 40V, and 60V constant voltage diodes in series in each circuit, and using light-emitting diodes with red, yellow, and green colors, you can determine the condition between the poles in more detail. .
In other words, when only the red light emitting diode is lit, the gap between the electrodes is almost short, and when both the red and yellow light emitting diodes are lit, the machining condition is good, and all of the red, yellow, and green light emitting diodes are in good working condition. It can be seen that when the light emitting diode is lit, the state between the electrodes is somewhat open.

In the case of a die-sinker electrical discharge machine, the polarity of the electrode is often changed, so a diode D is inserted between the resistor R and the light emitting diode LED as shown in Figure 4, and the polarity of the electrode is changed so that the forward direction of the current is reversed. and connect two sets in parallel. In this way, even if the polarity changes, when a voltage is applied between the electrodes, one of the light emitting diodes lights up, so the discharge state can be known.

g. Effects of the invention As can be understood from the explanation of the embodiments above, the present invention consists of an upper nozzle section 13 that also serves as a guide section for the electrode 19 in an electrical discharge machine, and an arm that supports the upper nozzle section 13 at its tip. 7, a plurality of constant voltage diodes ZD with different Zener voltages are connected in parallel, and a light emitting diode LED with a different color tone is connected in series to each constant voltage diode ZD. 25 is provided at the tip of the arm 7.

As is clear from the above configuration, in the present invention, a gap condition indicator 25 is provided at the tip of the arm 7 of the electrical discharge machine, and the gap condition indicator 25 is designed to detect the Zener voltage. A plurality of different constant voltage diodes ZD are connected in parallel, and each constant voltage diode ZD is connected to a light emitting diode LED with a different color tone.

That is, according to the present invention, the gap state indicator 25
is placed close to the processing work place, and by visually checking the display on this display 25, it is possible to know whether the power is on or not. Moreover, by observing the lighting conditions of the plurality of light emitting diodes LED provided in the display 25, it is possible to know whether the gap between the electrodes is short-circuited, the machining condition is good, or the condition is slightly open.

[Brief explanation of the drawing]

Figure 1 is a front view of the mechanical part of a wire-cut electrical discharge machine implementing this invention, Figure 2 is a schematic diagram of this invention, and Figures 3 and 4 are explanatory diagrams of other embodiments of this invention. . Explanation of the symbols representing the main parts of the drawing, 1...
Wire cut electrical discharge machine (mechanical part), 7... Upper arm, 13... Upper nozzle part, 19... Wire electrode, 25... Inter-electrode condition indicator, R... Resistor,
LED: Light emitting diode, ZD: Constant voltage diode.

Claims (1)

[Scope of utility model registration request] In an electric discharge machine, a plurality of constant voltage diodes ZD having different Zener voltages are connected in parallel between an upper nozzle part 13 which also serves as a guide part for an electrode 19 and an arm 7 supporting this upper nozzle part 13 at its tip. In addition to providing each constant voltage diode
An electric discharge machine characterized in that a machining gap status indicator 25 is provided at the tip of the arm 7, which is formed by connecting light emitting diodes LEDs of different colors in series to the ZD.