SU988515A1 - Apparatus for adjusting interelectrode gap - Google Patents

Description

one

The invention relates to electrophysical methods for the treatment of metals and, in particular, relates to an inter-electrode gap controller (MEP).

A device for regulating the MEP, which contains the measuring circuit, the decoder, the first, second, third switches, the coarse feed control circuit, the exact feed control circuit, the coarse actuator, the exact feed 1 actuator, is known.

The disadvantages of the known device are as follows. Firstly, the known device ensures alternate operation of the executive elements of the circuits, coarse and: precise movement, which reduces the productivity of the process. Secondly, due to the alternating operation of the executive elements of the coarse and precise displacement circuits, the electric motor in the coarse displacement circuit does not work under optimal conditions and is forced to overcome the deadband.

The aim of the invention is to improve the performance of the erosion treatment by reducing the time of the mouth. innovations of the mode of operation of the regulator of exact feed and optimization of working conditions of the executive mechanism of coarse feed.

The goal is achieved by the fact that the device additionally contains a control unit for the exact feed controller, the input of which is connected through an adjustable integrating link, which has a constant time equal to 3-5 pulse-following periods, to the interelectrode gap, and the output to the decoder and the precision feed regulator block, the coarse feed regulator control unit is connected to the input through a second adjustable integrating link; having a constant time 3-5 times longer than the first, with a decoder, and on the output - with a coarse regulator unit, and an adjustable voltage source connected to the coarse regulator control unit.

Claims (1)

The proposed scheme provides the effect that the coarse actuator feeds at speed. The average average speed of the power outage is at a given time, and it works under optimal conditions, and the exact feed actuator responds to random changes in the state of the interelectrode gap. The drawing shows a block diagram of the proposed device. The device for regulating the MEP 1 contains a coarse feed regulator unit 2 connected to a coarse actuator 3, a precision feed regulator block 4 connected to an exact feed actuator 5, a decoder 6, and the exact feed regulator control block 7 is connected through adjustable integrating link 8, having a time constant equal to 3-5 periods of pulses with MEP 1, and the output with demarcator 6 and block 4 of the regulator of exact feed, connected to the input through the second adjustable integrator its link Yu, which has a time constant of 3-5 times more than the first, with a decoder 6, and the output - with the block 2 of the coarse feed controller; an adjustable source of reference voltage 11, connected to the control unit 7 for the precision feed regulator, and the control unit 9 for the coarse feed controller. A pulse generator 12 for supplying the electrodisciping apparatus is connected to the electrode gap 1. The device operates as follows. The signal from the firing gap 1 through the integrating link 8 is fed to the control supply control unit 7, where the reference voltage from the adjustable voltage source 11 is also supplied. In the control control unit, the control voltage is compared to No voltage from the output an integrating link and a control signal is generated for the operation of the precision feed controller unit 4, which actuates the feed actuator 5. The control signal from the controller control unit is also supplied to the decoder 6, which, analyzing the operating status. The feed control controller generates a control signal from the coarse feed controller 2, the igo controller is transmitted through the integrating link 10 with a longer time constant than the integrating link 8. The coarse feed regulator control unit 9 compares the signal nociy from the integrating link 10, and the signal coming from the adjustable source of the reference voltage 11, and outputs a signal to the coarse feed controller 2, which th actuates the actuator 3 coarse feed. The difference in the constant times of the integrating links 10 and 8 provides the effect that when operating the device, the exact feed actuator responds to random changes in the electrode gap, and the coarse actuator feeds the electric tool with a feed value equal to the average firmware speed. The regulation of the inter electrode gap 1 is carried out along the pulse amplitude envelope, and therefore an adjustable integrating link 8 is introduced into the circuit. The time constant (T) of the adjustable integrating link 8 is determined by the follow-up period (T) of working pulses in the interval and is equal to (3 -5) TSL. In order to obtain the optimal characteristic of the amplitude envelope of the pulses, the time interval (T) of the integrating link 8 should be chosen in the order of T1, (3-5), where T. is the pulse following period. When b., (H-5) T, d, errors in the formation of the envelope of the pulses due to a large increase; inertia of the integrating circuit. At T (3-5) Tp, errors increase due to a very short time constant. With the frequency range of operating pulses (440 Hz-440 kHz), t, e, T.5g (2.5-10-2, 5-10) s, the time constant of the integrating link 8 is adjusted within ti-i (3 -5) T ;; (3-5) (2,5-lO- 2, 5-10-) c. The magnitude of the time constant (2) of the integrator 10 is selected within (3-5) t, in order to ensure optimal operation of the coarse and accurate feed controllers. With (3-5) t, the coarse feed adjuster provides the optimum conditions for the operation of the precision feed adjuster. At T (3-5) 1; -, the coarse feed regulator works together with the accurate feed regulator, and for optimal operation, separate operation of the feed regulators is needed. Thus, the performance of coarse and exact feed controllers is performed at one time, and, consequently, the processing capacity is increased by eliminating time, the exact feed control regulator operation mode is established, which takes place in the case of sequential foob controllers and accurate feeds. In addition, the actuator coarse feed in the proposed device works without ryshkov, t. with. under optimal conditions, which increases the stability of maintaining the size of the interelectrode gap. Apparatus of the Invention A device for adjusting the magnitude of the electrode gap, comprising