SU1215901A1 - Electrode feed device - Google Patents

Description

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The invention relates to electrophysical methods of metal processing, namely, devices for moving and placing the electrode in a working position relative to the product, and can be used for precise EDM machining of parts, especially when electrofusion polishing precision surfaces, in particular, compaction of a cone and direction There are holes in the housings of diesel injectors,

The purpose of the invention is to improve the accuracy of the electrode feed by eliminating its deformation.

The drawing shows the proposed device for feeding the electrode.

The device for feeding the electrode contains a drive roller 1 with a screw thread along the length of the outer surface and a clamping element made in the form of a prism 2. The guide surface 3 of the prism has a length equal to the length of the outer surface of the drive roller with a screw thread. The spring 4 presses the prism to the electrode 5, and the latter - to the drive roller, the axis of rotation of which is parallel to the axis of the electrode. Electrode 5 is installed inside guide 6 so that its end is located near the surface 7 to be processed and is separated from the last electrode gap.

The surface 7 to be treated is a sealing cone in the body of the sprayer 8. The latter is mounted on a mandrel 9 fixedly mounted on the body 10 of the machine. The body of sprayer 8 is equipped with a belt 11, intended to rotate this body.

The drive roller 1 is conveniently made composite. It is advisable to make its outer, cut part made of hardened steel, and the turns, unlike the usual thread, are sharp on the ledges, and not rounded. Between the axis 12 of the drive roller and its outer part, the sleeve 13 of insulating material can be rigidly fixed. At the same time, it is also desirable to make the prism 2 as a whole or its guiding surfaces 3 out of a solid insulating material, for example, ceramics, this increases

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its durability and reduces the risk of electric shock when setting up the machine and working in it. The supply of pulses to the electrode was-,

It exists through the thickened part 14 of the guide 6. On the axis 12, the rotation is transmitted either directly from the engine or, if necessary, to change the feed rate,

for example, in multi-mode processing, through an appropriate gearbox (with relatively small gear ratios),

Plate with guiding chute

to ensure the freedom of rotation in the plane perpendicular to that in which the axes of the drive roller 1 and the guide 6 are located, are freely mounted on an L-shaped

spring-loaded corner installed with the possibility of swinging on the balls. There are other options for installing the prism 2 with the provision of the specified condition of freedom of rotation,

for example, on a ball joint. The edges of the screw thread on the drive roller are necessarily sharp, as otherwise when applying slightly bent electrodes

there are feed rate violations.

The device for feeding the electrode works as follows.

Electrode 5 is installed between

a drive roller 1 with a screw thread and guiding surfaces 3 of the prism 2. The spring 4 presses the prism 2 of the electrode 5 and the latter presses the screw cutting of the drive roller 1. The sharp tips of the turns of the drive roller 1 cut into the electrode, but since there are many turns, then an electrode supply force of 2-5 kgf is sufficient to

significant penetration depth. With the length of the cut part of the roller 1 and the guide surface 3 prism 2 is equal to 15 mm at 30 turns (0.5 mm pitch, diameter 20 mm)

clamping force 0 kgf. By rotating the axis 12, the threaded portion of the roller 1 is rotated and, by itself, the electrode 5 is moved in the direction of its axis. To change the direction

Leaning the electrode 5 changes the direction of rotation of the axis 12, to accelerate or slow down the supply, respectively, accelerate or slow

 l rotate this rotation. Electrode 5 is fed to the surface 7 to be processed along the opening of the guide 6, which is located from this surface to the distance of a given interelectrode gap.

Due to the fact that the prism 2 is installed with the freedom of rotation in the plane, perpendicular to that in which the axes of the drive roller 1 and directions 6 are located,

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The line of the initial bends and other defects of the electrode in its direction is compensated by self-priming of the prism 2 along the electrode 5, 5 to the oriented guide 6. Therefore, the electrode 5 moves with the feed to the guide 6 along its axis, which causes the flow with minimal effort, and therefore , and with 10 smallest cropping and deformation, which provides improved feed accuracy.

Claims (1)

DEVICE FOR ELECTRODE FEEDING, comprising a guide, a drive roller with a screw thread on the outer surface, the axis of which is parallel to the axis of the guide, and a clamping element, distinguished by the fact that, in order to accurately supply the electrode by eliminating its deformation , the clamping element is made in the form of a plate with a prismatic groove covering the electrode, and mounted on hinges with the possibility of rotation in a plane perpendicular to the axis of the guide. • 1215901