SU747676A1 - Electro-erosion machine for cutting-out along contour - Google Patents

Description

. one

The invention relates to the field of electrophysical and electrochemical processing methods, and, in particular, relates to an EDM machine for contour cutting.

There is a known electrical erosion machine for contour cutting with a wire electrode with a master oscillator, the output of which is connected to the first input of the coincidence circuit, the second input of which is connected to the key device, and the output to the input of the power amplifier, the process current meter is connected to the output circuit, and the regulator interelectrode gap, the output of which is connected to the feed drive, controlled by software device i.

A disadvantage of the known device is that ITO cannot guarantee the absence of a broken wire electrode.

The purpose of the invention is to exclude the possibility of a broken wire electrode.

The goal is achieved by the fact that an integrating device has been introduced into the machine, the input of which is connected to the output of the technological current meter, the first input to the input

the interelectrode gap controller, the second input is connected to the input of the key device, and the control input of the integrating device is connected to the output of the software device, the other output of which is connected to the input of the master oscillator.

FIG. 1 is a block diagram.

10 EDM contouring machine (multi-position); in fig. 2a is a time diagram of the voltage from the output of the master oscillator to the first input.

15 match patterns; in fig. 2b is the voltage at the output of the integrating device (proportional to the current through the interelectrode gap) fed to the input of the key device .;

20 in FIG. 2v-voltage. at the output of the key device arriving at the second input of the coincidence circuit; in Fig. 2d, the voltage at the output of the coincidence circuit arriving at the input of the power amplifier.

The diagrams of FIG. 2a-d are given on a single time scale. FIG. 25 U, switch-on level of the key device, and 2. -the level of the key device off; t, t2, is the period of periodic operation of the key device. The EDM machine for cutting parts includes a software device L, a master oscillator 2, integrating devices 3, a drive 4, matching circuits 5, key devices 6, mosh amplifiers 7, regulator 8, interelectrode gaps 9, measuring instruments 10 of technological currents. All of these devices are interconnected as follows. The outputs of the progamming device 1 are connected to the inputs of a driver generator 2, an integrating device 3 and a drive 4, respectively. The output of a driver generator 2 is connected to the inputs of a matching circuit 5. The other input of the matching circuit 5 is connected to the outputs of the key devices 6, the input of the key devices 6 is connected to; The outputs of the integrating devices 3 Another output of the integrating devices 3 is connected to the inputs of the controller 8, the output of which is connected to the drive 4. The output of the circuits 5 matches Associated with the inputs of the power amplifiers 7, loaded at the interelectrode gaps 9. In the output circuits of the power amplifiers 7, there are included meters of 10 technological currents, the outputs of which are connected to the inputs of the firing devices 3, respectively. By command from the software device 1, the master oscillator 2 is turned on, the signals for setting the response level of the key devices 6 are input to the input of the integrating devices 3, the drive 4 is turned on. The master oscillator 2 generates control pulses (Fig. 2a), which are fed to one of the inputs schemes 5 matches. At the second input of the matching circuit 5, a resolution signal is supplied from the corresponding key device 6, as a result of which, at the output of each circuit 5, control signals appear that are proportional to the master oscillator signal (Fig. 2d). The signals from the output of the coincidence circuit 5 are fed to the corresponding power amplifiers 7, where they are amplified and fed to the interelectrode gaps 9. During the operation of the machine, the inputs and) M (of the process current operators 10 receive signals proportional to the currents flowing through the corresponding interelectrode gaps 9., And after the signals have been extracted by the process current meters 10, the above signals go to the integrating devices 3, where they integrate c (Fig. 26), the constant integration time value being set by the software device 1, the signals from the outputs of the integrating devices 3 are fed to the inputs of the key devices 6, and the operating levels of the key devices The triggers 6 (Fig. 26) are adjustable and their size is selected depending on the diameter and breaking force used by the wire electrode. When a signal arrives from one of the integrating devices 3, equal to the level and (Fig. 25), the corresponding key device 6 turns off ( Fig. 2b), a prohibitory signal is fed to the second input of the corresponding circuit 5, resulting in the control signals at the input of the corresponding power amplifier 7 (Fig. 2d), and, consequently, on the corresponding interelectrode gap 3 there will be no pulses of the technological current of the operating frequency. When one of the inputs of the regulator 8 receives a signal from the corresponding device 3 about a short circuit, the corresponding information from the regulator 8 comes to the drive control circuit 4. At this time, the corresponding integrating device 3 begins to lose stored energy, the voltage amplitude at its output it begins to decrease when the level Uj is reached. (Fig. 26) At the output of the key devices 6, the enabling signals appear, which are fed to the inputs of the power amplifiers 7, and technological current pulses appear on the interelectrode gaps 9. With a normal processing process (without the appearance of short circuits), the level U is not exceeded. In the event of a short circuit of any interelectrode gap 9, the corresponding key diagram b will periodically operate {FIG. 2b, section t, -t2; ) until the regulator 8 removes the wire electrodes from the short curtain, the output of the power amplifier 7 will generate pulses with a frequency much lower than the frequency of the master oscillator 2, and the current flowing through the corresponding interelectrode gap 9 will not exceed the allowable for used wire electrode The use of a machine made according to this invention in the instrument-making and tool industry can significantly reduce the scrap due to burnout of wire elements. trodes, increase by two or three classes of processing purity 10-20% increase manufacturing throughput of parts and introduce mnogostanochnoe service and thus two or three times to reduce the complexity of manufacturing parts, is widely used for manufacturing subminiature parts wire electrodes with small diameters.

Claims (1)

1. USSR author's certificate No. 335070, cl. B 23 P 1/02, 1970. W ".8. / a . t IT (Pit a. 3