SU464433A1 - Device for regulating the supply of the electrode tool in the electrical discharge machining of metals - Google Patents

Description

the pulses of the voltage removed from its secondary winding lock the G1T1 traisistor, the PT2 transistor opens, the PTZ trazistor is locked, and the relay P1 de-energizes. The required power from the transformer Tr2 is supplied through 1 normally locked part and 1 of the contacts of the relay P1 on the depleting bridge D2-D5 and then to the output of the output key resistor bridge (K1, K2, R8, R9) .iiHiHviKiHiiie chains (St1, D7; l St2, D8) are connected through the normally closed contact of the relay P1 parallel to the main winding of the servomotor Dv and stabilize ia of the indicated voltage winding required for supplying and discharging the tool electrode during processing.

In emergency modes (during long short circuits or idle strokes), no current flows in the erosion gap circuit and, therefore, the current on the secondary winding of the current transformer Tr1 is exhausted. The voltage taken from the collector of the transistor PT2 of the multivibrator and amplified by an intermediate amplifier triggers the relay P1, the winding of which is included as a collector load of the PTZ transistor 1. Its normally closed contact opens, disconnecting the stabilizing chains (St1, D7 and St2, D8), and the rising voltage through the closed part of the switching contact of the relay P1 is fed through the rectifying bridge D2-D5 to the output bridge bridge (K1, K2, R8, R9), the diagonal of which includes the main winding of the servomotor Dv.

Due to the above mentioned, including diodes, voltages, the root winding of the servomotor is powered not from a source with a non-rigid characteristic, which is formed due to the presence of external voltage resistances R8 and R9 in the cores of the output bridge; voltage 1 kornoy o.motrovka Dv when working pa "Outlet and" The supply is established differently by selecting the type of diode-stabilovoltovtov St1 n St2 with different voltages of stabilization.

With an increase in the load on the motor shaft due to, for example, an instability of the friction coefficient in the mechanical transmission, the torque to the shaft also increases, since the current in the core circuit increases with a constant voltage. Thus, the drive characteristic at low speeds becomes more

tough.

The introduction of the scheme, including accelerated displacements at idle and short circuits of the erosion gap, and reacting to it in the case of idle speed

the first bits, by switching on a lower approach speed, can drastically reduce the number of idle strokes and short circuits, i.e., increase the productivity of the process while eliminating overshoot and self-oscillation mode.

Subject invention

Device for regulating iodachi

Electrode-instrumentalized during electro-erosion processing of metals, the input of which is connected to the secondary winding of a current transformer included in the discharge circuit of the pulse generator, with a bridge on the thyristors and controlled keys, in the diagonal of which is the root winding of the servomotor of the feed motor with a parallel meeting of parallel-connected diodes-stabilovoltami with various Iairu

stabilization and soldering in series with rectifying diodes, characterized in that, in order to increase processing performance and reduce the number of idle strokes and short circuits,

it contains a waiting multivibrator, whose input is connected with the secondary winding of a current transformer, and a relay with an input connected to the multivibrator output, and the switching relays of the relay are included in

The power of the bridge is normal, and the normally closed contact is at the price of a stabilovoltage diode.

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