SU952503A1 - Electric discharge machine feed controller - Google Patents

Description

(54) ELECTRO-EROSION FEEDING REGULATOR

MACHINE

one

The invention relates to electrophysical processing methods and, in particular, relates to an erosion machine feed regulator.

The known supply controller in erosion machines contains a potentiometer, a filter, an emitter follower, a pulse-voltage-to-constant voltage converter, consisting of three Schmitt triggers, two AND logic circuits, and an amplifier from whose output a voltage is applied to a drive unit.

In the controller, the stability of the EDM process is increased due to the introduction of three levels of operation and the introduction of the step-wise control device 1.

The disadvantage of the regulator is its inertia and the presence of overshoot of the supply of the electrode-tool during high-frequency super-finite EDM processing. The lack of a regulator is due to its presence at the filter inlet.

The purpose of the invention is to reduce inertia and overshoot the feed drive.

The goal is achieved by the fact that the supply controller, which contains a potentiometer, a Schmitt trigger, whose input is connected to a moving contact of a potentiometer, are two AND logic circuits, an amplifier

 the supply and power take-off amplifier, to which the drive motor is connected, a master generator of high-frequency impulses of the power source, a control trigger, an input “Installation About which is connected to the output of the master oscillator, an input“ Installation 1 is connected to the output of the Schmitt trigger, and a direct and inverse outputs are connected to the inputs of two logic circuits And, the second inputs of which are connected to the output of the master oscillator, an controlled trigger, inputs “Installation About n“ Installation 1 of which are connected to the outputs of the logic circuits And, and the stroke is connected to the supply amplifier, logic circuit AND, one input of which is connected

20 to the inverted output of the controlled trigger, the second input is connected to the low-frequency output of the high-frequency master oscillator of the power source, and the output is connected to the amplifier of the retraction.

FIG. 1 is a block diagram of the feed control; in fig. 2 and 3 are voltage diagrams on circuit elements.

The feed regulator (Fig. 1) contains potentiometer 1 ,. Schmitt trigger 2, high-frequency master oscillator 3 of the power supply, control trigger 4, logic circuitry 5 and 6, controllable trigger circuit 7, logic circuit 8, power supply amplifier 9, rejection amplifier 10 and motor 11.

FIG. Figure 2 shows the pulses in the processing of single pulses: a - input voltage pulses on the Schmitt trigger; b - output pulses of Schmitt trigger voltage; c - control voltage pulses Um at the input of control trigger 4; d - voltage pulses at the direct output of control trigger A; e - voltage pulses at the inverse output of control trigger 4; e are control pulses of voltage Uy.j at the inputs of logic circuits 5 and 6; W - output pulses of the logic circuit And 5; 3 - output pulses of the logic circuit And 6; m - voltage pulses at the direct output of the controlled trigger 7; k - voltage output pulses at the inverse output of the controlled trigger 7.

FIG. Figure 3 shows the pulses in the case of electroerosive processing by bursts of pulses: a - voltage pulses at the electrode gap; b - output voltage pulses at the direct output of the controlled trigger 7; c is the output voltage pulses at the inverse output of the controlled trigger 7; (d) control voltage pulses applied to the input of the logic circuit 8; d - voltage pulses arriving at the input of the amplifier 9 inlet; e - voltage pulses arriving at the input of the amplifier 10 of the outlet.

The regulator works as follows.

The interelectrode gap is supplied with pulses from a high-frequency master oscillator 3 of the power supply, which are fed through potentiometer I to the input of Schmitt trigger 2 (Fig. 2a). The triggering level of the Schmitt trigger 2 is set by potentiometer 1 slightly below the level of the idling pulses in the very soft EDM mode (Fig. 2a, dashed line). Under the influence of idle pulses (the first three pulses of Fig. 2a), at the output of Schmitt trigger 2, pulses of the same amplitude (Fig. 26) are formed, which set the control trigger 4 to the state "1" (Fig. 2d). At the direct output of the control trigger 4, a logical "1 appears, which permits the passage of the control pulse Uy2 (Fig. 2e) through the AND 5 logic (Fig. 2g) to the input" Set I

the controlled trigger 7, and on the inverse output of the control trigger 4 a logical "O appears, prohibiting the passage of the control pulse Uy through the logic circuit And b (Fig. 2h) to the input

“Installation About Controllable Trigger 7.

Controlled trigger 7 is set to state "1. At the direct output of the controlled trigger 7, a logical "1 (Fig. 2i) appears, which opens the supply amplifier 9 and the engine 11 is turned on for feeding. Using control pulses Uy2 (Fig. 2c), control trigger 4 is reset to the "O" state. F l the following pulses passing through the interelectrode gap,

5 will correspond to the level of short-circuit pulses or working pulses (the fourth, fifth and multiple pulses of Fig. 2a), the Schmitt trigger 2 will not work, and therefore the control trigger 4 will remain in the state "O (Fig. 2d).

The logic circuit And 5 is blocked by the input logic "O from the direct output of the control trigger 4, and the logic circuit And 6 opens (Fig. 2h) on the input of the logic" 1 with the inverse output control

5 trigger 4. The control pulses Uy (Fig. 2e) pass through the logic circuit And 6 (Fig. 2h) and set the control trigger 7 to the state "O (Fig. 2n). At the direct output, a logical "O (Fig. 2i) appears and the supply amplifier 9 is turned off, and at the inverse output (Fig. 2k) a logical" 1 "appears and the tap amplifier 10 is turned on.

During operation with bursts of pulses (Fig. 3a) during the following period, idle pulses at the direct output of the controlled trigger

 7 (FIG. 36), control pulses are generated, which are fed to the input of the approach 9 (FIG. A). During pauses between bursts of pulses, as well as at moments when working pulses or short-circuit pulses pass through the interelectrode gap, a logical < 1 > (Fig. ≫) is formed at the inverse output of controlled trigger 7, To the second input of which the control pulses LJyj (Fig. 3g) are fed from the low-frequency output of the master oscillator 3 of the power supply source. As a result, control pulses (FIG. Ze) are generated at the output of the logic circuit 8, corresponding to only

0 operating mode short circuit. Thus, the average voltage in the supply circuit is strictly proportional to the number of idling pulses, and the average voltage in the drain circuit is the number of short-circuit operating pulses, i.e.

5 l / cp. Nimp. x.h.

Ucp. otvodaN rab.imp. Mimp.k.Z.

Introduction to the controller master oscillator power source control

a trigger, a controlled trigger, and a logic circuit eliminates the use of a filter at the input of the controller. Only two states of the feed drive are provided: approach (idle mode) or withdrawal (short circuit mode or operating mode), and the idle state is eliminated, thereby significantly overshooting during the transition from idle mode to operating mode, namely: the moment of occurrence of the first working impulses a change in polarity of the voltage at the motor terminals of the drive, which leads to accelerated braking, unlike the known one, in which at the time of polarity change of voltage at the motor terminals the drive eliminates the supply and return amplifiers, as a result of which there is no accelerated deceleration of the electrode tool, but an overshoot ("overrun) takes place.

Claims (1)

Invention Formula A regulator for the supply of an EDM machine containing a potentiometer connected to the interelectrode gap. m Schmitt trigger, the input of which is connected to the movable contact of the potentiometer, two AND logic circuits, a supply amplifier and a supply tap amplifier to which the drive motor is connected, differing so that, in order to reduce the inertia and overshoot the feed drive, a master oscillator is introduced into it, a control trigger, an input “Installation About which is connected to the output of the master oscillator, an input“ Installation 1 is connected A to the output of the Schmitt trigger, and the direct and inverse outputs are connected to the inputs of the AND logic circuits, the second inputs of which are connected to the output of the master oscillator, a controlled trigger, the inputs "Installation O and" Installation 1 of which are connected to the outputs of the logic circuits And, and my output is connected to the supply amplifier, and the logic circuit is And, one input of which is connected to the inverted output of a controlled trigger, the second input is connected to the output master oscillator, and the output is connected to a tap amplifier. Sources of information taken into account in the examination 1. Swiss patent number 468237, cl. In 23 P 1/00, published. 1969. eight YU FIG. one in but ip 5 ppp inn BUT / but for n FIG. 2 Cf Ж1Ш (ryg.Z