SU1255326A1 - Method of electrophysical and chemical dressing of diamond wheels - Google Patents

Description

The invention relates to electrophysical and electrochemical processing methods and, in particular, to the editing of diamond wheels and can be used directly in the course of grinding.

The aim of the invention is to improve the efficiency of the edit.

The drawing shows the implementation of the proposed method.

The diagram shows the right of the right cathode 1, holes 2 for the supply of electricity. The shta, the right metal rods 3, the diamond layer 4 on the metal link, the diamond grinding wheel 5, the ground cutter (part) 6 and the nail 7 in the holes for changing the right rods.

Metal right rods 3, which are freely placed in the fiber x 2 of the cathode for supplying electrolyte o. If possible, the contact with the circle is in continuous motion in the flow of electrical energy, they can touch BepiiniH; 1) X grains adhering to the chip circle and also contact the walls of the cathode aperture. At the moments of contact with the cores of the cathode openings, they become additional right-handed electrodes, leakage currents from them intensify the electrochemical straightening of the circle, when they come into contact with sticky chips, a short-circuit occurs, the chips are heated, it melts or burns away from the circle . Due to the collapse of the circle and the free exchange of rods, the erosion contact is instantly interrupted.

Thus, the rods intensify electrochemical straightening and have an instant microelectroerosion and mechanical effect on diamonds and adhered chips. The diamond wheel is better cleaned and liked, the specific cutting work decreases.

The rods, under the influence of e; hectare of rolite, attenuate the interelectrode gap in the most worn areas of the diamond layer and partially compensate for the loss of the shape of the circle profile and the irregularity of the electrochemical correction associated with it in these areas. With further irregular wear of these areas, the constant electrochemical component of the current of the straightening falls, the sections are salted, the grinding power increases, but at the same time the short circuits of the greasy sections with the ruling metal shank increase.

The moment of the periodic insertion of the right cathode into the diamond wheel is determined by the achievement of a predetermined level of power increase and grinding at a simultaneous decrease in the constant and increase in the variable component of the current dressing on fixed grinding modes. In this case, there are four possible changes in the criteria for choosing the moment of incision associated with an increase in power given in the table.

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The first case occurs with an increase in the gap between the cathode and the circle of the amount of metal particles of the chips being cut. Permanent and alternating components of the current of morality increase in connection with the electrical and ionization of M and e. 1 the electrochemical effect on the chip, the power increases due to an increase in the hydrodynamic resistance of the gap.

The second case occurs when, as a result of circle wear, the gap and the electrical resistance of the electrolyte increase, the constant electrical component of the current of the diffractor decreases, the cutting properties of the circle deteriorate and the increase in .MOHJ.-iiocTb polishing. At the same time, an increase in the gap leads to a decrease in the hydrodynamic counterpressure in the gap, metal rods freely distributed in the holes of the cathode extend iia by a large amount and the intensity of short circuits with a circle increases, the variable current component increases. . The diminution stabilizes after the cathode cuts into the circle.

The third case arises at a general reduction of the gap during grinding, for example, it causes thermal spindle lengthening. The constant current component of the straightening increases in connection with the reduction of the electrolyte interlayer, the power increases as the flow resistance of the gap increases. For the same reason, the hydraulic back pressure increases, the rods touch the diamond wheel less and the variable component of the right-handed straightening decreases.

The fourth case occurs when the electrical conductivity of the electrolyte decreases and when many of the two dielectric particles get into the gap. Electroerosion on and electrochemical straightening of a circle deteriorates, its cutting properties fall, and polishing performance is increased.

The tests of the method are carried out on a universal sharpening machine equipped with a device for electrochemical morality of a circle. Samples of carbide VK8 specimens 18 mm long, 12 mm high, diamond diamond DIA 160/125, binder MB1, concentration 100% are codified. The working fluid in the form of an aqueous phosphate-soda-nitrite solution

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supplied at a flow rate of 0.8 l / min through ka-5 m / min, transverse flow of 0.015 mm / stroke

Tod in the form of a steel bar with a length of 68 mm, the maximum productivity of grinding with a height of 20 mm (the length of the arc of the gap with a circle of 900, the voltage straightening I3B

70 mm), equipped with 16 holes. The initial gap between the cathode and the circle, which are freely inserted by metal-and-g 0.01-0.02 mm, for 7 min, the grinding wire 0 0.6 mm, length 7 , 0 mm. 5 vanilla (50-60% of the time of overruns) with the current source of the straightening is two-way hard alloy plates

the VS-24M propeller. about 10 mm high (I will eat about 2200-

Grinding modes: 2240 rpm went -2300 mm), wear of the diamond layer for it

foveal circle, lengthwise by feed 3,5 3.5–4.1 µm (by a known method

49 bits / min, stroke length 35-40 mm, speed 4,0-4,5 micron), rod wear 0.1-0.2 micron.

Claims (1)

METHOD FOR ELECTROPHYSICOCHEMICAL EDITING OF DIAMOND CIRCUITS on a metal bond, in which the circle is connected to the positive pole of the technological current source, the electrolyte is fed through the holes in the gap between the circle and the cathode, and during the editing process, the cathode is incised into the diamond wheel periodically to the height of its working profile, followed by tap the ruling cathode by the magnitude of the interelectrode gap, characterized in that, in order to increase the efficiency of dressing, in the holes for supplying electrolyte freely p zmeschayut metal rods with the possibility of contact with the wheel surface, and a periodic insertion point is determined from the condition of achieving a predetermined level of grinding power increase while reducing the constant and variable components of the dressing increasing current. er sl w w o