SU757287A1 - Apparatus for electroerosion treatment of sheet-rolling rolls - Google Patents

Description

The invention relates to the field of electrical discharge machining of bodies of revolution, for example, rolls of cold rolling mills, and can be used at enterprises producing a thin cold-rolled sheet with a matte surface for the automotive industry.

A device is known with which a matte microrelief is applied to the surface of the rolls by the method of electroerosion [1].

The known device for erosive processing includes a frame, a bath for dielectric fluid, support rollers, a roll rotation drive and pendulum electrode holders in the form of two shoulders, on which plate electrodes and elastic links, counterbalanced ^on the other side, are located. When the rotation of the roll under the action of disturbing forces. mechanical and electrical dynamic origin formed interelectrode gap ₂₀ which stabilizes ziruet process sparking.

The disadvantage of the above device is a limited number of electrodes, which does not allow to increase the manufacturer2

processing efficiency, as well as the design complexity of electric holder assemblies

The aim of the invention is to provide the possibility of processing large-sized rolls, carried out in the conditions of creating a dynamic interelectrode gap.

This is achieved by the fact that each elementary electrode is installed in a cassette in its own electric holder freely with the possibility of movement in the direction of the surface being processed under the action of its own weight. Each electrode holder can be mounted in a cassette parallel to the axis of rotation of the treated roll with the possibility of installation rotation.

This design of the device allows the roller to be processed at the same time with 50 electrodes, instead of 10, which greatly improves productivity and makes it possible to eliminate the pendulum electrode holders.

FIG. 1 shows the device, view

from the side; in fig. 2 is a longitudinal section AA

in fig. one; in fig. 3 - view along arrow B on

FIG. 2

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The device consists of a frame 1, made in conjunction with a bath for a dielectric fluid. On the bed on both sides of the tub there are roller supports 2 on which the roll to be processed is mounted. On top, along the generator roll, the electrode holders 3 are placed along the entire length of the surface to be machined, which are pivotally attached to two arcs 4 made of an insulating material.

The electrode holder 3 is made of two plates 5, to the ends of which axis 6 is attached so that a gap of 4-5 mm remains between the plates. In the slots of the electrode holders 5, lamellar electrodes 7 are freely positioned. The hinged connection of the electrode holders 3 · with arcs 4 allows the adjustment angle of inclination to the roll surface to be adjusted.

Electrode holders 3 together with arcs 4 are an electrode cassette, which is connected to a frame with the help of hinges 8. In working condition the cassette is located on top of the treated roll. When removing the roll, the cassette is retracted beyond the bed frame by turning relative to the hinges 8.

The rotation of the roll is carried out from the drive (not shown in the drawings).

The operation of the device is as follows.

On the roller bearings 2 is set roll so that its lower part was immersed in a dielectric fluid. The roller is covered with an electrode cassette, while the electrodes 7, freely located in the slots of the electrode holders, are pressed to the surface of the roll by the action of its own weight. The electrode cartridge wraps a portion of the roll surface along an arc of a circle. Each electrode, made in the form of a plate, is included in the autonomous circuit of the pulse generator. When the roll rotates at a speed of 30-150 rpm, all the electrodes will oscillate under the action of disturbing forces of mechanical and electrical origin, which contribute to the formation of a dynamic gap between the roller and the electrode, which is necessary for stable sparking.

The dielectric fluid is supplied to the treatment zone by grabbing the roll surface with it during rotation.

Electrode looseness ensures continuous monitoring of the roll surface as it is worn.

Adjustment of the electrode position relative to the part, at which the sparking intensity will be maximum, is carried out by rotating the electrode holder relative to its longitudinal axis. The speed of rotation of the roll and the weight of the electrode are selected from the conditions of the maximum frequency of oscillation of the electrode. The thickness of the electrode is selected from 0.5 mm to 3 mm and is determined by the size of the convexity or concavity of the roll surface. The greater the convexity or concavity of the roll, the thinner the electrode should be.

The proposed device allows to process large-sized rolls along their entire length simultaneously with a set of plate electrodes - tools. The free location of the plate-like electro-tools on the surface of the roll, as well as the possibility of their rotation (inclination) relative to the surface of the roll, make it possible to intensify the electric-spark process.

Claims (2)

Claim 1. Device for electroerosive processing of sheet rolling rolls, driven into rotation, by a multielectrode electrode tool with lamellar elementary electrodes mounted in a common cassette, characterized in that, in order to ensure the possibility of processing large-sized rolls, carried out under the conditions of creating a dynamic interelectrode gap, each elementary the electrode is installed in a cassette in its own electrode holder, free to move in the direction of the surface being processed under the action of its own weight. . 2. Device by π. 1, characterized in that each electrode holder is mounted in a cassette on a parallel axis of rotation of the processed roll with the possibility of installation rotation.