SU1465213A1 - Method of measuring interelectrode clearance - Google Patents

Abstract

The invention relates to the field of mechanical engineering, in particular to electrophysical and electrochemical processing methods, and relates to electroerosive grinding. The purpose of the invention is to increase the accuracy of the measurement of hГГ V-V -. the gap by taking into account the influence of hydrodynamic forces on the size of the gap. Electrodes 3 and 4, one of which (3) is hollow, feed in. Electrode 3 is turned off, the workpiece is treated with electrode 4 until electrode 3 is not. touch the surface of the workpiece 1. After touching, measure the first deviation of the dimensions of the electrodes 3,4 at the moment when the indicator arrow 10 turns off. The same cycle is performed with the electrode 3 turned on and the electrode 4 disconnected. The second deviation is determined. The difference of the deviations, depending on the hydrodynamic forces, determines the size of the interelectrode gap. 6 Il. L7 (L S G2 uf.t

Description

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The invention relates to electrical and electrochemical machining, in particular, electro-grinding.

The purpose of the invention is to improve the accuracy of measurement of the interelectrode gap by taking into account the influence of hydrodynamic forces on the measurement result.

Figure 1 shows an installation for determining the electrode gap, a general view; 2 shows the grinding process with two electrodes simultaneously; on fig.Z - package of electrodes in a characteristic section (section G - D in FIG. 2) ;. 4 shows the grinding process using an electrode completely; on fig.Z - type D in figure 4; FIG. b shows the process of grinding with a hollow electrode.

The workpiece 1 is fixed in the center 2. The installation contains two electrodes: hollow 3 and solid 4, separated by an insulating gasket 5. Electrode 3 is equipped with a channel for draining the working fluid from the internal cavity (not shown). The 3j4 electrodes are fixed in the holder b, installed with the help of the plate 7 on the base 8. On the plastic 9 there is a measuring device fixed with an indicator 10 and a tip 11. The holder 12 has the possibility of vertical movement. Center 13 supports the workpiece 1. The installation is equipped with a source, and the power supply with a pulse generator (not shown).

The method is implemented in the following way.

The captive 1 is driven into rotation in a reciprocating movement along the axis of rotation. Working liquid is supplied to the treatment area by irrigation. A voltage is applied to both electrodes from a power source and the carrier 12 is displaced to move the electrodes 354 to the workpiece 1.

Processing is performed until the operating current 1p of the power supply reaches

IP 0.7 ,,

where is 114% short circuit. In such conditions, the ends of the electrodes 3 and 4 are aligned. 55 Next, the electrode 3 is turned off and the workpiece is machined with electrode 4 until the electrode 3 touches the surface of the workpiece 1.

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In this treatment cycle, the working fluid is removed through the cavity of the electrode 3 from the interelectrode gap. The value of the first deviation of the dimensions of the electrodes A is determined from the difference in the sizes of the electrodes 3 and 4 at the moment of the arrow indicator 10 deflection (the indicator 10 shows the moment of contact of the electrode 3 and the workpiece 1).

Then, the electrode 4 is disconnected and the electrode 3 is connected to the power supply unit. Further processing is carried out until the indicator 10 again shows a deviation. In this case, the deviation of the indicator 10 does not register the contact of the electrode 4 and the workpiece 1, but their convergence to such a distance at which the hydrodynamic forces in the gap between the electrode 4 and the workpiece 1 begin to be recorded by the indicator 10. .

Based on the measurement results of deviations A and B, the component of the interelectrode gap, determined by the action of hydrodynamic forces, is determined. Accounting for this value allows to increase the accuracy of determining the interelectrode gap.

In the process of electroerosive grinding, which is carried out, as a rule, by a continuous bar electrode, the electrode can be brought closer to the workpiece — it can be carried out to a certain minimum value at which the device records the effect of hydrodynamic forces in the interelectrode gap. In each case, this distance will depend on the QT of the electrode area, the speed of rotation of the workpiece, etc.

The operating voltage in the nursing modes is chosen taking into account the magnitude of the hydrodynamic component of the interelectrode gap, i.e. the process of electroerosion must always be ensured.

Thus, the proposed method allows to take into account the value of the hydrodynamic component of the interelement-electrode gap when choosing the EDM grinding modes.

Claims (1)

Invention Formula The method for determining the interelectrode gap during electroerosive grinding, in which two are used. 3-14652 insulated electrodes of the same initial length, are treated with alternate disconnection of the electrodes. from the power source and the size of the interelectrode gap is determined by the difference in the size of the electrodes, characterized in that, in order to increase the accuracy of determining the gap by taking into account the influence of hydrodynamic forces in the interelectrode gap, one hollow electrode is used, and one solid electrode is used. 134 removing the working fluid through the hollow electrode, first disconnecting the hollow electrode, processing before contacting the preform and determining the first dimension deviation, then connecting the hollow electrode, disconnecting the solid electrode, processing until the preform touching the solid electrode , while the size of the gap is determined by the difference of deviations. FI.2 gd fig.z srigL gjus.B Editor M.Kelemes Compiled by E.Melder Tehred L. Serdyukova Proofreader M. Demchik Order 868/16 Circulation 892 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk iab., 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Subscription