SU1199498A1 - Method of electro-erosion dressing of abrasive wheel - Google Patents

Abstract

THE METHOD OF ELECTRO-EROSION EDITING OF THE ABRASIVE CIRCLE according to which the grinding of the right electrode alternates with the nursing process, which means, in order to increase productivity, the cutting depth is equal to 3-6% of the maximum size of abrasive grains of the circle, the nursing process is stopped when the idle pulses appear, and the grinding-nursing cycle is repeated until the nursing time is stabilized.

Description

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The invention relates to the straightening of abrasive diamond, elbor) circles on current-conducting links in an environment of weakly conducting electrolyte or dielectric fluid using a right-handed electrode, which can be used as a workpiece of the ground part 4

The purpose of the invention is to reduce the time for editing a circle.

The goal is achieved by grinding the right electrode without applying voltage with a depth of cut equal to 3-6% of the maximum size of abrasive grains of a circle, removing a volume equal to the product of the area using a cutting surface and cutting depth. before the appearance of idle pulses, the grinding-nursing cycle is repeated to stabilize the nursing duration.

FIG. 1 shows the cyclogram method; in fig. 2 - dependence of voltage supply in time; in FIG. 3 - dependence of the Q editing power on the depth of cut in plots on the grain size N.

The method of electroerosive straightening is carried out as follows. : First, abrasive grinding is carried out with a circle, which is subjected to straightening, of the right-handed electrode mounted on the machine table. The material with the volume equal to the product of the area of the cutting surface of the circle and the depth of cut is ground off from the right electrode.

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V irD-B.-b

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where D is the diameter of the circle;

B - the height of the circle.

The indicated amount of material removed from the right electrode, depending on the depth of cut, corresponds to the optimal conditions for the mechanical removal of loosely fixed and worn grains from the circle. This volume is ground off without applying voltage to the circle and the right electrode. For a time t (section 1-2, fig. 1), then nursing is performed (there is no feed for plunging) with voltage applied to the circle and 99A98i rights

electrode (section 2-3,. Fig. 2). At the same time, the amplitude voltage (and, c) is advisable to be set above the arc burning voltage. As a result of the erosion processes, the connection of the circle is destroyed, thereby exposing the new grains. Nursing is stopped when no-load impulses appear (point 3),

0 indicating a decrease in the efficiency of the electrical erosion process, which is recorded, for example, with an oscilloscope, pulse analyzer and other devices. Then carry out

5 re-grinding during time t, with a cutting depth tg. without applying voltage to the circle and right. electrode (section 3-4, fig. 1). At the same time, the grains exposed by electroerosia are cut out of the bundle of the circle. During grinding, the same volume is removed from the right-hand electrode as during the initial grinding (section 1-2). Then carry out the second

5 nursing with voltage applied to the circle and the ruling electrode (current 4-5) until the appearance of idle pulses (point 5).

Experimentally established

0 nursing time decreases as the circle is edited. and then stabilizes (nursing time in section 6-7 of Fig. 2 is equal to the time of nursing in section 8-9), which characterizes the end of the grinding cycle - nursing, t, e. circle edits (point 9).

As noted, the function (H) has an inflection point A, corresponding to the optimum dressing performance - Q (.), Which, when editing a circle with a given grain size (200 I60 µm, is at a depth of cut equal to 4-5% N. At the same time, proportional dependence is disturbed, entails a decrease in the increase in the productivity of editing, a violation of the stability of the process of editing a circle, as well as a deterioration of its cutting properties. In the case of editing circles with different characteristics, the inflection point A may be insignificant. respectfully

to shift. For example, with less grain - to the left (decrease in percent of H), and more - to the right. However, when straightening the wheels normally used in electroplating, the optimum straightening performance is achieved with a cutting depth lying flat in the range of 3-6% H,

P ROME er. An electric edging of the diamond wheel of the type 1AI 2720-0127 GOST 16167-80 DIA 200/160, M1-100% was made.

The right-hand electrode was a blank of ground part from UNDK 35T5 material, where the thermomagnetic treatment is) with an area of 125 cm. Electrode movements were reported: longitudinal feed - 20 m / min, transverse feed - 4 mm / stroke.

The value of the mortise feed was chosen equal to 5% of the maximum size of the diamond grains of the circle, i.e. 0.01 mm.

Diamond grinding was carried out, at which a volume of electrode material equal to 125 mm was ground. Then, nursing was performed with voltage applied to a circle and the right-side electrode-blank from a two-period rectifier (idle amplitude voltage 40-45 V) until the appearance of idle pulses, which were recorded with a T1H1-115 stub waveform oscillogram. It has been found that the intensity of the dressing increases by reducing the time of nursing and reaches 8-10 µm / min.

With the stabilization of the nursing time, the editing of the circle stopped. At the same time he had a high-cutting ability.,;, Since the time of editing depends

from the initial state of the circle and it is very difficult to find circles with the same state as grass, then the comparison of different methods, the editing was carried out not by the time of their editing, but by the maximum editing speed, the reduction of the radius of the circle per time unit).

Compared with the known method, the editing speed of the proposed method is increased by 2-5 times.

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Claims (1)

METHOD OF ELECTROEROSION EDITING OF THE ABRASIVE CIRCLE, according to which alternating grinding of the ruling electrode with the nursing process, is necessary because in order to increase productivity, the cutting depth is chosen equal to 3-6% of the maximum size of abrasive grains of the circle , the nursing process is stopped when the idling pulses appear, and the grinding – nursing cycle is repeated until the nursing time is stabilized.