RU2628948C2 - Machine mso-1201 for resistance butt welding of short articles of compact section - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: in the fixed and mobile frames, clamps are mounted with fixed and mobile welding electrodes. The drive of the mobile frame movement is formed as a cylinder with a proportional distribution valve, precipitation valve and the sensor of it position. Removable hydraulic stops are mounted on the movable and fixed frames at both sides of the clamp. The hydraulic cylinder of each stop provides pressing of the ends of short workpieces to retain them in clamps during melting and precipitation. Each pair of welding electrodes is provided with a flat hard-alloy plates through which welded product is supplied by hydraulic stops for deburring.

EFFECT: machine provides reliable clamping of short workpieces in clamps without increased efforts and combination of welding and deburring after resistance butt welding.

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Description

The present invention relates to welding production, and in particular to devices for flash butt welding by fusion of short rods, for example, cutting and fastening parts of a tool, performed on specialized welding machines. A mandatory operation of this process is the removal of burr at the weld site.

A device is known for welding blanks of a nut tap with removal of a burr by four semicircular knives with annular cutting edges covering a welded workpiece to the right and left of the burr in a separate burr (see the book "Resistance Butt Welding with Resistance to Form a Joint", collection of scientific works of the Academy of Sciences of the Ukrainian SSR Edited by V.K. Lebedev - Kiev, EO Paton Electric Welding Institute, 1988, pp. 80 ... 82).

The disadvantage of removing the burr in such a device is the inability to maintain the temperature of the weld heated during welding due to its rapid cooling when transferring the product to a separate burr, therefore, either re-heating or the use of great efforts to trim and separate the burr are necessary. It should also be noted that when removing grata on cooled products from hardened steels, cold cracks may appear at the junction.

Also known is the closest to the proposed invention in technical essence and the achieved result machine for flash butt welding of circular products with stripping of grata (see patent RU 2465109 C1, B23K 11/04, 37/08 10.27.2012), containing a fixed and movable bed on which there are two cantilever clamps with upper and lower current-carrying electrodes, with clamping drives, mechanisms for moving the movable bed during reflow and draft, containing a control system for clamping the electrodes and moving the movable bed at cooking, welding transformer, the electrodes of which are equipped with flat reinforcing carbide plates mounted on facing each other.

The disadvantage of the proposed device is that when welding short workpieces, it is impossible to keep them from slipping at the moment of upsetting in the clamps without increasing the clamping force, and an increase in the clamping force often leads to deformation of the workpieces and causes accelerated wear of the clamping jaws.

The technical result of the invention is to increase the productivity of manufacturing short articles of compact cross-section by combining welding and removal of burrs after flash butt welding to ensure reliable clamping of short workpieces in clamping jaws without increasing the clamping force.

The technical result is achieved by the fact that the machine MSO-1201 for flash butt welding of short articles of compact cross section, comprising a fixed and movable bed with clamps and welding electrodes, a drive for moving the movable bed in the form of a hydraulic cylinder with a proportional directional valve, draft valve and bed position sensor connected to them as well as a control system for moving the movable bed and a welding transformer, the electrodes of which are equipped with plates mounted on the facing sides of each other reinforcing carbide plates, equipped with removable hydraulic stops mounted on both sides of the clamps on a movable and fixed bed with the possibility of pressing the ends of the workpieces opposite to the welded, holding short products in the clamps during reflowing and settling of the workpieces and pushing the products through the reinforcing carbide plates after upsetting and releasing the clamp on the movable and lifting the clamp on a fixed frame.

The inventive flash butt welding machine for short articles of compact cross section is shown in FIG. 1, 2, where:

- in FIG. 1 schematically shows a machine for flash butt welding of short articles of compact cross section;

- in FIG. 2 schematically shows the position of the electrodes and stops of the machine when installing products in the electrodes before clamping;

in FIG. 3 schematically shows the position of the electrodes and the stops of the machine during stripping of the edges with the edges of the reinforcing plates of the electrode and the prism of the fixed clamp.

The inventive machine for flash butt welding of short articles of compact cross section (see Fig. 1, 2, 3) contains a fixed 1 and a movable 2 bed, on which are placed two cantilever clamps 3 and 4 with upper current-carrying electrodes 5 and lower prisms 6, while current-carrying electrodes 5 and lower prisms 6 of the fixed bed are equipped with flat reinforcing carbide plates 7, clamps drives 3 and 4 are made in the form of hydraulic cylinders 8 and 9, the drive of moving the movable frame 2 during reflow and draft is in the form of a hydraulic cylinder 10, control system clamping electrodes 5 and 6 and moving the movable bed 2, as well as a cycle of stripping the weld, a welding transformer 11 for fusion heating of the products 12 and two stops 13 mounted on both sides of the welding clamps on the movable and stationary frame with drives in the form of hydraulic cylinders 14 , 15. The stops are removable to provide welding conditions for products of various lengths.

The inventive machine for flash butt welding of short articles of compact cross section with stripping works as follows:

- after feeding short articles 12 between the fixed 1 and the movable 2 beds in the welding zone, they are installed on the lower prisms 6, then the upper current-carrying electrodes 5 of the clamps 3 and 4 are lowered and the products 12 are clamped between the electrodes 5 and the prisms 6 of the fixed 1 and movable 2 frames;

- include cylinders 14, 15 until the stops 13 are pressed into the ends of the opposite to the welded ends of the products 12;

- include a welding transformer 11 and a drive for moving the movable bed 2, carry out fusion, draft and welding of products 12;

- after upsetting, the welding transformer 11 is turned off, the upsetting force and the stop forces are removed, the upper clamp 4 of the electrode 5 is turned on to lift to the highest position, and the upper clamp 3 of the electrode 5 is turned on to lift by an amount equal to 0.05-0.07 mm, at the command of the displacement sensor, it is stopped and fixed in this position;

- turn on the pressure supply to the cylinder 14 of the stop 13 with its gradual increase, while the welded product 12 is fed to the fixed clamp 3 of the machine until the joint slips in the flat carbide plates 7 of the electrode 5 and the prism 6 of the fixed clamp 3, in which the cutting is still heated by cutting the edges of the plates 7, while the gap between the clamping surfaces of the electrode and the prism and the product 12 facilitates the sliding of the products during cleaning, reduces the force required for cleaning, reduces the wear of the electrodes from friction;

- turn off the pressure in the cylinder 14 using the displacement sensor 13 of the stop 13 and raise the clamp 3 to its highest position, move the movable bed 2 and the stop 13 to the initial position before welding, remove the finished product from the welding zone.

All operations on welding, deburring and returning mechanisms to their original position are carried out automatically by commands from the control system.

To simplify the operation of the machine in small-scale production, the hydraulic stops can be replaced by mechanical screw adjustable stops, while the operations of pressing the products before welding and during stripping can be performed manually.

Thus, the use in the proposed machine of two stops, mounted on both sides of the welding clamps on a movable and fixed bed with actuators in the form of hydraulic cylinders, not only did not increase the clamping forces of the workpieces, thereby preventing their crushing in the electrodes, but also allowed to combine welding and stripping operations and to improve the quality of stripping by removing the deposited metal immediately after welding, while maintaining the temperature of the welding heat.

The proposed machine can be successfully used in serial mass production in the manufacture of composite cutting tools.

Claims (1)

A machine for flash butt welding of short articles of compact cross section, comprising a fixed and movable bed with clamps fixed to them, equipped with fixed and movable welding electrodes, a drive for moving a movable bed in the form of a hydraulic cylinder with a proportional valve, an upset valve and a bed position sensor, a control system for moving the movable bed and welding transformer, characterized in that it is equipped with removable hydraulic stops mounted on a movable and on a fixed bed on both sides of the clamps, each of the stops is equipped with a hydraulic cylinder drive with the ability to tighten the ends of short workpieces opposite to the welded ends to hold the welded workpieces in the clamps during reflow and precipitation, while each pair of welding electrodes is equipped with flat carbide plates mounted on their facing each other, and the hydraulic stops are made with the possibility of extension of at least one of them to feed the welded product through cut flat carbide inserts when stripping.

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