SU761218A1 - Apparatus for adjusting interelectrode gap - Google Patents

Description

The invention relates to electrophysical processing methods and can be used in multi-circuit circuits for electroerosive processing with one spindle for adjusting the gap.

Known devices for adjusting the gap in multi-circuit EDM processing use a regulator with two autonomous compare-, shche-amplifying channels, one of which is connected to the erosion gaps of all circuits through the integrating circuits and the device for selecting the minimum instantaneous voltage, and the other integrating circuits, threshold and storage elements and logic circuit And [1].

A disadvantage of a known device is the reduced speed and limited use due to the type of servo drive.

The aim of the invention is to improve the performance and use of the device, regardless of the type of feed drive.

The goal is achieved by the fact that each integrating circuit is connected to the input of the feed regulator through one autonomous

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a key and one key common to all circuits, connected to the undervoltage selection unit through a comparison-amplifying circuit, and a pulse converter and a trigger connected to its two outputs, one of which is connected, are installed between each integrating circuit and the independent key; , to the corresponding inputs of the remaining triggers.

FIG. 1 is a block diagram of the proposed device; in fig. 2 - characteristic of the interelectrode gap; in fig. 3 is a diagram of voltages at the circuits and at the output of the device for selecting the minimum voltage.

Gaps 1 and 2 through the integrating ¹⁵ chains 3 and 4 and the keys 5-7 are connected to the input of the feed regulator 8. The output of the feed regulator 8 is connected to the input of the servo drive 9.

Between the integrating circuits 3 and 4 20 and the keys 5 and 6 are included pulse converters 10 and 11 with two independent outputs and triggers 12 and 13 with two steady states and separate start.

761218

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Between the integrating circuits 3 and 4 and the key 7 is installed block selection of the minimum voltage 14 and comparing the amplifying circuit 15.

The scheme works as follows.

At idle one of the keys is turned on, for example, 5, and the voltage from the output of the integrating circuit 3 is fed through the switch 7 to the input of the feed regulator 8.

Key 7 is controlled by a comparison and amplifying circuit 15, the input of which receives the minimum of the voltages of all circuits. The setting of the threshold element Shu is taken to be equal to the minimum operating voltage (Fig. 2). Key 7 is turned on at voltages above Shu and is turned on in the situation in question.

Thus, the voltage from the erosion gap 1 enters the input of the controller ^{1 of the} problem 8 at idle. The feed regulator 8 through the servo drive 9 pulls together the electrodes, controlling the voltage of one erosion gap 1. This process continues until ₂ for some reason, a short circuit will occur in one of the erosion gaps, for example 2. Key will open. 7

'and the supply of voltage to the input of the supply regulator 8 stops. ϊ

At the same time, the corresponding impulse converter 10 is triggered and the triggers (12 and 13) of all circuits are tilted to such a state that the corresponding switches (5 and 6 are opened). ₃ After that, the pulse converter 10 outputs a pulse shifted in time to trigger 12 and tilts it to a state in which key 6 is turned on.

Thus, after recovery of the voltage on the erosion gap 2, the input of the supply regulator 8 will be connected to the voltage of only this erosion gap until a short circuit on the other circuit does not require a new switch.

If the short circuit again occurs on the erosion gap 2, the regulation after the elimination of the short ’circuit is conducted according to the voltage of this circuit. four

To the output of key 7, a regulator with a servo drive of any type can be connected, while the speed of the control circuit is not reduced due to the fact that the regulator input is always connected only

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to one erosion gap, the remaining contours do not affect the regulatory process.

The expediency of regulation on one circuit is confirmed by voltage diagrams (Fig. 3).

The diagram shows the voltage pulses for a certain period of time, and the large amplitude pulses correspond to idle pulses, and a smaller amplitude - working.

If the voltage Ts 1 is connected to the input of the feed regulator with the minimum number of idle pulses in a given time, the regulation is carried out without affecting the other circuits.

If the feed regulator to the input voltage connected to U _{r e} or C may overshoot period for I or 2 and introducing them into a state of short circuit, after which the circuit is elected loaded. ''

The device provides an increase in productivity of not less than 10% with a dual-circuit processing circuit. With the increase in the number of circuits, the efficiency of the device increases.

Claims (1)

Claim A device for adjusting the interelectrode gap in multi-circuit EDM processing, which contains a supply regulator connected to the erosion gaps of all circuits via integrating circuits and a minimum voltage selection unit, characterized in that, in order to improve performance and use the device regardless of the type of servo drive, each integrating circuit connected to the input of the feed regulator through one independent key and one key common to all circuits connected to the selector unit the minimum Comparing-through voltage amplifying circuit and an integrating circuit between each key and the autonomous set and the trigger pulse transmitter connected to its two outputs, one of which is connected, moreover, to respective inputs of other triggers.