UA138656U - DEVICE FOR PERFORMANCE OF ELECTRO-EROSION DIAMOND GRINDING WITH VARIABLE POLARITY OF ELECTRODES - Google Patents

Abstract

The device for the implementation of EDM diamond grinding with variable polarity of the electrodes includes a power supply, a generator unit with a power amplifier, a duty cycle, a signal control unit, a power unit. The device is additionally connected to the electrode polarity switching unit, which is located parallel to the power unit and which is configured to interact with the generator unit with a power amplifier and signal control unit, and is configured to switch the electrode polarity by a time relay.

Description

The useful model belongs to the field of mechanical processing, namely to the design of devices for electroerosion diamond grinding, and can be used when grinding workpieces from difficult-to-machine materials with a conductive diamond tool on a metal bond.

In addition, a certain frequency of passage of working pulses, their frequency and power, respectively, changes at the set time due to the change of polarity on the electrodes, which is set by a specially developed device.

Known power sources for electroerosion diamond grinding are connected according to the scheme of direct or reverse polarity of the electrodes (1-3). The energy intensity of the electroerosion process is provided by a high-frequency generator of the SHGI-40-440A type - the closest analogues.

The disadvantage of this power source is the permanent polarity of the electrodes, which does not allow using all the power capabilities of diamond tools on a metal bond.

The task of a useful model is to ensure a smooth and separate regulation of the polarity of the electrodes, which allows you to use all the power capabilities of diamond tools on a metal bond. This is achieved by the fact that a specially designed device is introduced to the SHGI-40-440A generator, in which the polarity is changed using a block of electrode polarity switches.

The task is solved by the fact that the device for carrying out electroerosion diamond grinding with variable electrode polarity contains a power supply unit, a generator unit with a power amplifier, a slotted unit, a signal control unit, a power unit, according to a useful model, an electrode polarity switching unit is additionally connected, which located parallel to the power unit and made with the possibility of interaction with the generator unit with a power amplifier and signal regulation unit, and made with the possibility of switching the polarity of the electrodes using a time relay.

The schematic diagram of the device is shown in Fig. 1, and the electrical diagram of the device is shown on

Fig. 2.

Voltage Ш 2208 of industrial frequency is supplied to the power supply unit 1, through the rectifier it is fed to the generator unit with the power amplifier 2, the coupling unit 3, the signal regulation unit 4, the power unit 5 and the time relay 6. In unit 4, the pulses are summed with the pulses taken from of the split unit 3, and are fed to the power unit 5, which is also fed here

The generated frequency is taken from the generator unit with power amplifier 2. From the power unit 5, the current of the required frequency, frequency and power is supplied to the electrode polarity switching unit 7, in which, with the help of a time relay 6, with a connected load, the polarity of the electrodes is switched.

In electroerosion diamond grinding, in order to reveal the non-working layer of the bond, the most acceptable frequency of passage of unipolar pulses is 8000 Hz - with reverse polarity, when the tool is the anode and the workpiece is the cathode. For this purpose, in the electrical diagram of the electrode polarity switching block (Fig. 2), there is a switch that turns off the time relay. At the same time, the switching unit 7 is automatically set to a position in which a fixed frequency of pulses is supplied to the working area. The generator with a power amplifier is assembled on two pentodes, type GU-30. To protect the circuit from overloads, during idling, in parallel with the "output", the circuit provides a nonlinear resistance - electric incandescent lamp I.

The expediency of the duration of the polarity change, based on practical and theoretical foundations, turned out to be equal to one second. This amount of time was ensured by the selection of energy parameters, based on the actual properties of the material of the processed workpieces and the diamond wheel. Adjustment of such parameters in other conditions should be carried out directly during processing.

The device makes it possible to increase the performance of diamond wheels on metal ties and reduce energy costs when processing workpieces from difficult-to-process materials, ensuring increased productivity and quality of processing compared to existing methods of abrasive-diamond processing.

The periodic change in the polarity of the electrodes, with a combination of different energy parameters, can be used as a basis for various processing methods directly related to the electroerosion process.

Sources of information: 1. Patent of Ukraine for utility model Mo 22847А MPK В24В 1/00, publ. 30.06.1998, Bull.

Mo Z. 2. Determination of electrical parameters of diamond-spark grinding of nanostructured hard alloys /R.M. Strelchuk, M.D. Uzunyan //Cuts and tools in 60 technological systems. - Kharkiv: NTU "Khpy", 2009. - Vp. 76. - pp. 181-184.

WITH.

Research and analysis of the interrelationship of ultimate macrostress and wear resistance of tools made of nanostructured hard alloy "VolKar" after diamond-spark grinding / 3.I.

Kolupaeva, R.M.

Strelchuk, M.D.

Uzunyan //Cutting and tools in technological systems. - Kharkiv: NTU "Khpy", 2010. - Vp. 78. - pp. 85-91.

Claims (1)

UTILITY MODEL FORMULA A device for carrying out electroerosion diamond grinding with variable electrode polarity, containing a power supply unit, a generator unit with a power amplifier, a split unit, a signal control unit, a power unit, which is characterized by the fact that the device is additionally connected to a unit for switching the polarity of electrodes, which located parallel to the power unit and made with the possibility of interaction with the generator unit with a power amplifier and signal regulation unit, and made with the possibility of switching the polarity of the electrodes using a time relay. And about GT and sleep Fig. 1