RU1779496C - Device for controlling feed of tool electrode in electroerosion machines - Google Patents

Abstract

The invention relates to electrophysical and electrochemical processing methods. The device comprises a pulse generator, a servo feed of the electrode-tool, an amplification unit, a capacitive storage, two sources of positive and negative voltage, two keys, a trigger and a pulse analyzer. The device automatically eliminates temperature drift. 2 ill.

Description

The invention relates to electrophysical and electrochemical processing methods, in particular, to the flow control of EDM machines.

An automatic controller for electrical discharge machines (EES) with a system for converting a pulse signal into a continuous one comprising a peak detector connected to a source of pulse signals and a switching device is known.

The disadvantages of this regulator are the setting of the reference voltage or resistance value of the resistor, which must be changed manually when changing the processing mode, as well as the need for manual adjustment of these parameters during operation in the selected mode due to the temperature drift of the amplifying channels.

A device for regulating the supply of the electrode tool (EI) in EDM machines equipped with a pulse generator and a controlled servo drive, comprising serially connected sensor of electrical resistance of the interelectrode gap (MEP), a wrench that conducts in two directions, a capacitive storage device, amplifying and comparing device, as well as a timer and a reference voltage source.

The disadvantages of this device are the low accuracy of maintaining the MEC value due to the insufficiently high repetition rate of interrogation pulses, which leads to excessive displacements of the electrode-tool between interrogations, which leads to an increase in the number of idling pulses and short circuit, which leads to a decrease in productivity EDM processing

Joint venture

with

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especially in the finishing regime, when the MEA is small - 0.03 ... 0.07 mm, and the movement of the EI is 0.02 ... 0.05 mm (at a sampling frequency of 100 Hz and a feed speed of EI 2 ... 5 mm / s); the need for periodic manual adjustment of the supply level due to the temperature drift of the amplifier-comparing device.

The purpose of the invention is to automate the adjustment of the feed level associated with the temperature drift of the amplifier-comparing device.

Figure 1 presents a diagram of a device; Fig. 2 is a graph of voltage variation across a capacitive storage device versus voltage across an interelectrode gap.

A device for controlling the supply of the electrode-tool in EDM machines equipped with a pulse generator 1 and a servo drive 2 with an amplifying device 3, the output connected to the servo drive 2, contains a pulse analyzer 4, the input of which is connected to the interelectrode gap 5, trigger 6, two inputs connected to the outputs pulse analyzer 4. In addition, the device contains a potentiometer 7, one output of which through a controlled key 8, for example, a transistor, is connected to a source of positive voltage 9, the control input of the key 8 is connected to the direct output of the trigger 6. The other output of the potentiometer 7 is connected to the negative voltage source 11 through the control key 10, and the control input of the key 10 is connected to the inverse output of the trigger 6. The potentiometer 7 motor is connected to the capacitive storage 12 and the input of the amplifier device 3.

The device operates as follows.

When 4 idle pulses arrive from the electrode gap 5 at the pulse analyzer, a voltage pulse Ui 0 appears at its output Ui, which brings the trigger 6 to the state in which the latter closes the key 8 and opens the key 10. When this occurs, capacitive storage 12 from a positive voltage source 9 through a closed key 8 and potentiometer 7 (section 1-2 in Fig. 2).

When a working pulse arrives at the pulse analyzer 4, a voltage pulse U2 O appears at its output IJ2,

which leads the trigger 6 to the state in which the latter opens the key 8 and closes the key 10, while the capacitive storage 12 is recharged from the negative voltage source 11 through the closed key 10 and the potentiometer 7 (section 2-3 in figure 2) . The positive voltage on the capacitive storage 12 corresponds to the supply of the electrode-tool, the negative voltage-tap. By varying the potentiometer 7 of the constant charge and recharge time of the capacitive storage 12, the ratio of the number of pulses is set, which is automatically supported by the feed controller. The temperature drift of the amplifier device 3 does not affect the operation of the feed controller, since an alternating voltage signal with a frequency of the pulse generator 1 is supplied to the input of the amplifier device 3, and information about the direction and magnitude of the movement speed is contained in its envelope.

Feed control device

tool electrode in EDM machines eliminates the influence of temperature drift, i.e. elimination of manual adjustment of the supply level, as a result of which the stability of the device and the level of automation are increased.

Claims (1)

SUMMARY OF THE INVENTION Feed control device a tool electrode in EDM machines, comprising a pulse generator, a tool feed servo drive and a capacitive storage device, and an amplification unit connected to an input tool tool servo drive, characterized in that, for the purpose of automatically controlling the electrode gap, a pulse analyzer is introduced into the device trigger two keys, sources of positive and negative voltage and a potentiometer, the conclusions of which are connected through the corresponding keys to the outputs of the sources of positive and negative voltage, and the potentiometer engine is connected to the capacitive storage and the input of the amplification unit, the input of the pulse analyzer is connected to the electrodes, and the output to trigger inputs, the direct and inverse outputs of which are connected respectively to the control inputs of the keys. L / C Ј Ft; 1 /