SU1371812A1 - Power supply source for electric discharge machining - Google Patents

Abstract

The invention relates to electrophysical and electrochemical processing methods, in particular, concerns power sources for electroerosive and electroerosive chemical processing. The purpose of the invention is to enhance processing performance by optimally adjusting the frequency of the bits and the duration of the pause between pulses. The shaper 4 pulse generator is controlled by a sequence of pulses from the master oscillator 1. The pulse stream from the master oscillator 1 to the shaper 4 is interrupted by signals from the breakdown recorder 8 by applying prohibitory signals to the coincidence circuit 2. At the same time, the breakdown recorder 8 sends a signal to the key 14, providing a current to the interelectrode gap 12 from the source 15. The duration of the pause between pulses is inversely proportional to the duration of the sample delay, which increases processing capacity. 4 il. i (L

Description

1

 13

The invention relates to electrophysical and electrochemical processing methods, in particular, with regard to power sources for electrosurgical treatment.

The purpose of the invention is to increase processing performance.

Figure 1 shows the block diagram of the device; figure 2-4 shows the time diagrams of the currents and voltages when the device is operating.

The device comprises a master oscillator 1, a coincidence circuit 2, a scaling circuit 3, a driver 4 for igniting pulses in the form of a driver 5, a control key 6, and a voltage source 7. The device also contains a block 8 for recording breakdowns in the form of a current sensor 9, a voltage meter 10 and a former 11. Block 8 is connected to the interelectrode gap 12. The block 8 for recording breakdowns is connected to a setting unit 13 for the duration of power pulses. The output of the dial 13 is connected to the second input of the circuit 2 of coincidence and the control key 14 of the source 15 of the power pulses. The keys 14 and the source of 15 pulses form the shaper 16 of the power pulses. To the output of the key 14 is connected to the valve 17. The outputs of the imaging unit 16 and the unit 8 are connected to the interelectrode gap 12 of the same poles, and the output of the imaging device 16 through the valve 17.

Figure 2 shows the time diagram of the voltage across the interelectrode gap 12. The following notation is entered in the diagram: fp - the duration of the pause between pulses j dn - the duration of the delay

test; and - voltage across the interelectrode

interval 12.

Fig. 3 shows time diagrams of the current on the interelectrode gap 12 when using the device for electroerosive processing and in Fig. 4, when using the device for electroerosive and chemical processing.

In the diagrams of FIGS. 3 and 4, the notations are entered:

Ij ,, - the amplitude of the current on the interelectrode gap 12 during electro-erosion treatment;

 -jjxo current amplitude on the interelectrode gap 12 during electroerosive-chemical processing.

The device works as follows.

The master oscillator 1 supplies pulses to one input of circuit 2 of coincidence. In the initial state of the setting device 13, the enabling signal is fed to the second input of the circuit 2 of coincidence. As a result, the pulses of the master oscillator 1 are passed to the input of the scaling circuit 3, which performs frequency division.

The pulse from the output of the circuit 3 is passed to the driver 4 ignites pulses. The key 6 operates, and the voltage of the voltage source 7 goes to the interelectrode gap 12 When an interelectrode gap 12 is broken, the breakdown recording unit 8 is triggered, in which the current signal from the sensor 9 and the voltage from the meter 10 arrive at the input of the imager 11.

The signal of the block 8 registration of the breakdown is fed to the unit 13 the duration of the power pulses. The setting device 13 generates a prohibitory signal for the coincidence circuit 2 and simultaneously switches on the key 14, allowing the supply of voltage to the interelectrode gap 12 from the source 15 through the valve 1 7.

As a result, both sources 7 and 15 are connected to the interelectrode gap 12.

The current flowing through the interelectrode gap 12 corresponds to the diagrams of FIGS. 3 and 4, and the voltage to the diagrams of FIG. 2.

Since the operation of the master oscillator 1 does not affect the scaling circuit 3 during the action of the power pulse, the pause time between pulses C is inversely proportional to the sample delay time.

,about.

Thus, in the absence of breakdowns or with large breakdown delays Cjn, the duration of the pause between pulses Cn is minimal. In the case of fry, the breakdown delays {, „the duration of the pause between flj pulses will be the longest, but will not exceed that allowed by the master oscillator 1 and the scaling circuit 3.

13718

As a result of automatic adjustment of the pause duration, automatic adjustment of the frequency of generation of bits from small,, with large breakdown delays, to the maximum allowed by master oscillator 1 with scaling circuit 3 is achieved.

This provides improved processing performance.

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Claims (1)

Invention Formula A power supply for electro-thrashing, which contains the generator J5, the igniter pulse driver, the driver of power pulses, and the valve, the input of the driver for igniting pulses is connected to the driver generator, the fan is installed in the output circuit of the driver of power pulses, and , 0 50 12 Shaper drivers are connected to each other so that one pair of like poles is connected through a valve, and the other is connected, distinguished by the fact that, in order to improve performance, a source for recording the gap between the electrodes is introduced into the source, the power pulse duration setting unit is recalculated the scheme and the scheme of coincidence, while the sensor of the duration of the power pulses is connected to the recording unit of the start of the sample, the output of the setpoint device is connected to the driver of the power pulses and one input of the coincidence circuit that specifies the gene The generator is connected to another input of the coincidence circuit, the output of the coincidence circuit is connected to the recalculation circuit, and the output of the latter is connected to the shaper of igniting pulses. Г ГГГЧГГГЬ 1 h .f-, f / f. ., 2n. .g / g . , "BUT. , . n 1 p p p p p p p p p FIG. 2 Fig, s hl gp g-Pg-Pg l l l Fy