SU837715A1 - Apparatus for electric spark alloying - Google Patents

Description

I

The invention relates to electrophysical processing methods, in particular, to devices for electrospark doping.

. A device for electric-spark doping is known, in which a filling capacitor is connected parallel to the electrodes, in the charge circuit of which a vibrator coil is connected, which allows synchro-shunting of the operation of the vibrator with the operation of the filling capacitor. In AD In a known device, a rectifier connected to the secondary winding of the transformer is connected to the capacitor via a lane.

However, the frequency of vibrations is determined by the frequency of the network, which leads to a deterioration in surface quality and a decrease in performance.

The purpose of the invention is to increase the pumping of la and the productivity of doping.

The goal is achieved by the fact that the thyristor is connected to the common point of the storage collector and the electrode by the anode, and to the common point of the storage capacitor and the vibrator coil via the cathode through the self-oscillating mode of the vibrator.

The self-oscillating mode of the vibrator is made on a transistor, a resistor, a capacitor and a diode and is connected in such a way that the base of the transistor is connected to one capacitor plate and the cathode of the thyristor, and the collector of the transistor is connected to another plate of the capacitor and the cathode of the diode, transistor emitter, in turn, connected to the winding, the second end of which is connected to the diode anode and the lining of the storage capacitor connected to the contact plate, and the resistor is connected parallel to the collector-emitte junction p transistor.

FIG. 1 is a block diagram; in fig. 2 - schematic diagram of the device

Claims (2)

The device (Fig. 1) contains a capacitive current limiter 1, the output of which is connected to the primary winding of the transformer 2, and the secondary winding through rectifier 3 is connected to the inductive drive 4, the output of which is connected to the control key 5, accumulated the concentrator 6, the regulator 7 and the reinforcing electrode 8. The key 5 is also connected to the controller 7 and the self-oscillating unit 9, which is connected to the vibrator coil Yu, connected in turn to the storage capacitor 6 and the contact plate 11. Through the fuse 12 using a switch 13 capacitive limiter 1 is connected to the network, the secondary winding of the transformer 2 is connected to the rectifier 3 on the diodes 14 - 17. The regulator 7 is made on resistors 18 and 19, the resistance of which determines the opening voltage of the thyristor 2O. The control switch consists of a thyristor 20, diodes 21 and 22, through diode 22 a current goes to ammeter 23 and capacitor 6. Parallel to capacitor 6 is a discharge resistor 24. To measure the amplitude of the output voltage, the circuit contains a diode 25, capacitor 26 is a voltmeter 27. -For the operation of the vibrator in the self-oscillating mode between the thyristor 20 (Fig. 2) and the plate of the storage capacitor 6 connected to the contact plate 11, the unit of the self-oscillating operating mode of the vibrator, consisting of transistor 28, is turned on A resistor 30, a diode 31, and a vibrator coil 10. In the proposed device, unipolar DC pulses are applied to the vibrator coil, which is included in the charging circuit of the storage capacitor, which are simultaneously charged for the storage capacitor. When the installation is turned on in the network, the charging current passes through the storage capacitor 6 and the vibrator coil 10. The appearance of a current in the vibrator coil leads to the stimulation of the core with the electrode 8 and compression of the spring. As it is charged, the voltage of the storage capacitor 6 increases to the value determined by the opening voltage of the thyristor 20.. After opening, the thyristor 2O shunts the charging circuit of the storage capacitor 6, and the charging current flows through the open thyristor and the base-emitter junction of the transistor 28. when the electrode 8 approaches the product, the storage capacitor 6 is discharged into the product and strengthened. Due to the discharge of the storage capacitor, the voltage supplied to the control electrode of the thyristor 20 decreases and the current flowing through the thyristor decreases, which leads to the locking of the thyristor and the transistor 28. Locking the transistor 28 increases the voltage on the coil of the vibrator 10, while the contact electrode 8 with the product is broken. Break of contacts 8 and 11 when locked -. The thyristor volume 2O causes the appearance of current in the storage capacitor 6 and the coil of the vibrator U, which contributes to holding the electrode 8 in the open state until the storage capacitor 6 is charged to a predetermined voltage. The introduction of a self-oscillating mode unit expands the frequency range of the device when a forced on and off the vibrator coil is synchronized with the charge and discharge of the storage capacitor. The frequency of the vibration of the electrode 8 is determined by the charging time; storage capacitor 6 and the inertia of the mechanical system of the vibrator. Sequential alternation of the charge of the storage capacitor 6 and contacting the hardening electrode 8 with the workpiece installed on the contact plate 11 increases the vibration frequency, stabilizes the value of the discharge energy and increases the doping performance by 2 ~ 25%. Forced detachment of the electrode 8 from the workpiece reduces the time of their contact and, consequently, short-circuit currents, and also excludes welding of the electrode to the part — this allows reducing the burns and increasing the quality of surface to be treated. Reducing the short-circuit currents reduces the heating of the electrode and the electric holder, while increasing the reliability of the device. Claim 1. Electro-spark doping device comprising a filling capacitor connected in parallel with the electrodes, in the charge circuit of which a vibrator coil, a thyristor connected 58 For the purpose of improving the quality and performance of doping, the thyristor is connected to the common point of the storage capacitor and electrode in order to improve the quality and performance of doping, and the cathode through the device of self-oscillating vibrator operation introduced into the device to the common point of the storage capacitor and the vibrator coil. 2. The device according to claim 1, characterized in that the self-oscillating mode of the vibrator is performed 1.56 a transistor, a resistor, a constator and an aioce, while the transistor and the resistor are connected in parallel to a friend and through the diode parallel to the vibrator coil, and the capacitor is connected to the inter collector and base of the transistor to which the cathode of the said thyristor is connected. Sources of information taken into account in the examination 1. USSR author's certificate N 283461, cl. B 23 P 1/18, 1969. Vjui K 5 G 1sG | 0 22 2b