SU946840A1 - Apparatus for feeding electrode wire - Google Patents

Description

(54) DEVICE FOR ELECTRODE SUPPLY

one

The invention relates to mechanical engineering, in particular, to the production of devices for the supply of electrode wires, mainly when electroerosive piercing holes of small diameter.

A device for feeding an electrode wire, containing a drive roller with an insert made of an elastic material, which is placed in a groove, and a pressure roller 1, is known.

However, this device does not provide the high precision required for the electric-spark piercing of precision holes of small diameter, because the rubber liner is elastically deformed not only in the direction of the roller axis, but also in the wire feed direction.

The purpose of the invention is to improve the accuracy of the supply of electrode wire.

This goal is achieved by the fact that in the device for supplying the electrode wire, containing a pressure roller with an insert made of an elastic material and placed in a groove, and a driving roller, a groove roller is made WIRES

with protrusions covering the insert from the side of contact with the drive roller.

The drawing shows a diagram of the device.

The device for feeding the electrode wire contains a drive roller 1 and a pressure roller 2. The drive roller I in the zone of contact with the electrode wire 3 has a width not larger than the diameter of this wire. Driving roller 1 mounted on shaft 4

) 0 with freedom of movement relative to the supports 5 and 6 in the direction of the axis of the shaft 4 (in place with this shaft). The pressure roller 2 is fixed on the shaft 7 parallel to the shaft 4. The pressure roller 2 contains a groove, the width of which is equal to the diameter of the electrode wire 5, and the diameter of the groove is smaller by the diameter of the roller by an amount greater than two diameters of the electrode wire. The groove of the roller 2 is formed by cylindrical elements 8-10, adjacent one

Claims (1)

20 to another. The drive roller 1 is mounted in the groove of the roller 2, i.e., between elements 8 and 10 and opposite the middle element 9. Gears 11 and 12 which are in mesh are fixed to shafts 4 and 7 and supporting disks 13 and 14 adjacent thereto, closed on each other. The half-sum of the diameters of these discs is equal to the center-to-center distance of the gear wheels 11 and 12. The shaft 7 is connected to the pressure mechanism 15 in the area between the pressure roller 2 and the gear wheel 12. The pressure mechanism 15 contains a sleeve 16, pressed by a spring 17, and a shaft 18 interacting with the sleeve 16 The shaft 18 is installed perpendicular to the axis of the shafts 4 and 7 and can be rotated around its axis and mates with the sleeve 16 on a movable fit on parallel coats. In the depth of the groove of the roller 2, the bore is made 19. The outer diameter of the bore is made equal to meter groove, ie, less than the outer diameter of the roller 2 by an amount greater than two diameters of the electrode wire. In the bore there is a cylindrical liner 20 made of an elastic material with a high coefficient of friction. The width and diameters of the liner are equal respectively to the width and diameters of the bore, i.e. the body of the liner completely fills the cavity of the bore. The outer surface 21 of the liner 20, having a groove diameter, is for the electrode wire 3 a bearing surface of the groove. The width of the bore is several times the width of the groove. The inner diameter of the liner is such that the half-difference of its diameters is larger than the amount of wear of the liner during the overhaul period. The device for feeding the electrode wire works as follows. The rollers 1 and 2 rotate together with the shafts 4 and 7, feeding the electrode wire 3 along the groove of the roller 3. The roller 1, covered by the elements 8 and 10 of the roller 2, shifted relative to the supports 5 and 6 along the axis of the shaft 4, takes the position optimal for supplying the electrode wire 3. The kinematic coupling of the shafts 4 and 7 is carried out by the gear wheels 11 and 12. The rollers 1 and 2 are pressed to the electrode wire 3 by the clamping mechanism 15 by means of the spring 17. In this case, the bearing surface 21 of the insert 20 at the contact point with the wire 3 is elastically deformed, as a result its their contact occurs over a substantial surface, and the adherence force by friction in great enough. As a result, the wire 3 is fed into the treatment area without slippage even with a small force of pressing the rollers 1 and 2 to the wire 3 under conditions of their intensive longitudinal vibration. At the same time, the insert 20, due to its coverage by the cavity of the bore 19, remains clearly fixed relative to the elements 8-10 of the roller 2 on all sides, which ensures the accuracy of the specified wire feed speed 3. As the insert 20 of the roller 2 is worn, the shaft 7 rotates with the sleeve 16 on the shaft 18, thereby bringing the centers of the rollers 1 and 2 closer to their total value from the nose. This rotation occurs relative to the point at which the supporting discs 13 and 14 come into contact. Implementing the invention will significantly improve the accuracy of supplying thin electric wire and increase the device’s indebtedness of the device The invention Apparatus for supplying an electrode wire containing a pressure roller with an elastic foil inserted in the groove material, and a drive roller, characterized in that, in order to increase the accuracy of wire feed, mainly from ductile metals, due to elastic deformation of the insert, a groove roller formed with protrusions covering liner from contact with the drive roller. Sources of information taken into account in the examination 1. Belfort M. G. and others. Roller devices for wire feeding in apparatus for arc and slag welding. automatic welding, 1971, no. 12 (prototype).