RU2277462C1 - Resistance flash-butt welder - Google Patents

Abstract

FIELD: mechanical engineering; welding.

SUBSTANCE: invention relates to resistance flash-butt welding machines designed for connection of long-length articles. Proposed machine has fixed clamp, auxiliary clamp, guides, movable clamp installed for movement relative to fixed clamp in guides along in guides along longitudinal axis of articles to be welded, and device to remove reinforcement of weld. Auxiliary clamp is rigidly coupled with fixed clamp and it is made for holding articles to be welded when removing reinforcement of weld in process of weld cooling and at tightening the articles during auxiliary operations before welding. Movable clamp is arranged between fixed and auxiliary clamps.

EFFECT: enlarged functional capabilities of machine when connecting long-length articles.

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Description

The present invention relates to the field of flash butt welding and can be used to create butt welding equipment for joining long products (for example, for welding lashes of rails in the field).

As analogues to the proposed invention, machines for flash butt welding of rails in the field K-355, K-900, K-920 (Kuchuk-Yatsenko S.I. Flash butt welding by fusion. Kiev: Naukova Dumka, 1992) can be adopted.

All these machines are basically made in accordance with one scheme and consist of a fixed clamp, a movable clamp and a device for removing the reinforcement of a welded joint mounted on a movable clamp. These machines work as follows.

The parts to be welded are clamped in the fixed and movable clamps; the actual welding cycle is performed. After upsetting, the pressure is removed from the fixed clamp and the movable clamp together with the welded parts returns to its original position. Next, the movable clamp is clamped again, the pressure is removed from the movable clamp and the movable clamp is moved together with the device to remove the reinforcement towards the fixed clamp, cutting the reinforcement of the weld. After that, the fixed and movable clamp is opened. The disadvantages of analogues include the fact that they can be used for welding long products only if these products do not have elastic tensile reactions at the end of the welding cycle. Moreover, such machines are not applicable for tight rail welding.

When these machines are used to connect lashes of rails before welding, a loop is formed on one of the connected lashes to prevent the occurrence of a tensile reaction in the welded lashes. Obviously, the complexity of the auxiliary work when using analog machines is very high.

A known machine for welding rails in the field K-922 (Kuchuk-Yatsenko S.I., Krivenko V.G., Bondaruk A.V., Didkovsky A.V., Mikitin Y.I., Gudkov A.V. " Contact butt welding of rails: experience and prospects. "Way and track facilities, No. 9, 2004, pp. 15-17), selected as a prototype for the proposed invention.

The machine consists of a fixed clamp, a movable clamp, a device for removing the reinforcement of a welded joint, equipped with its own drive of movement along the longitudinal axis of the rails.

The prototype machine works as follows.

The parts to be welded are clamped in the fixed and movable clamps; the actual welding cycle is performed. After upsetting when the fixed and movable clamps are clamped, the reinforcement of the weld is cut off by moving the device to remove the reinforcement towards the fixed clamp. The welded rails are held in fixed and movable clamps until the welded joint cools down. After cooling the welded joint to the required temperature, the fixed and movable clamps are opened.

The prototype machine compares favorably with the analogues discussed above and can be used to tighten rails. The disadvantages of the machine include the fact that it cannot be used to tighten the rails during preparatory operations when there is a large gap (for example, 20 ... 50 mm) between the ends to be connected before welding is performed; for this, it is necessary to have other auxiliary track equipment available, which makes it possible to hold the rails in tension before clamping them in a welding machine. Naturally, this reduces the productivity of repair and welding work in the field.

The objective of the proposed solution is to expand the technological capabilities of welding equipment when connecting long products, for example, when connecting lashes of rails or pipes in the field, when performing repair welding of a railway track.

The problem is solved as follows - a flash butt welding machine for long products is proposed, comprising a fixed clamp, guides, a movable clamp mounted to move relative to the fixed clamp along the guides along the longitudinal axis of the parts to be welded, a device for removing the weld reinforcement, while further comprises an auxiliary clamp rigidly connected to the fixed clamp and configured to hold the parts to be welded when performing the operation of removing the reinforcement of the weld during cooling of the latter and when pulling parts during auxiliary operations before welding, the movable clamp is located between the stationary and auxiliary clamps.

The drawing shows a diagram of the proposed machine, consisting of a fixed clamp 1, guides 2, a movable clamp 3, a device for removing the reinforcement of a welded joint 4, an auxiliary clamp 5, welded parts 6 and 7. Fixed clamp 1 serves to hold the welded part 6 during execution welding cycle.

The guides 2 serve to give the direction of movement of the movable clamp 3.

The movable clamp 3 serves to hold the part to be welded 7. The device for removing the reinforcement of the welded joint 4 is designed to remove the reinforced welded joint squeezed out from the welding zone.

Auxiliary clamp 5 is designed to hold the welded parts 6 and 7 during the operation to remove the reinforcement of the welded joint, when cooling the welded joint, and also when pulling the parts 6 and 7 when performing auxiliary operations before welding. The auxiliary clamp 5 is rigidly connected to the fixed clamp 1.

The machine operates as follows.

In the fixed clamp 1 clamp the welded part 6.

In the movable clamp 3, the welded part 7 is clamped. If there is a gap between the parts 6 and 7, a pull-up operation is performed, which consists in the following: the movable clamp with part 7 is moved towards the fixed clamp. Upon reaching the gap required for welding, or when touching parts 6 and 7, clamp the auxiliary clamp 5, then move the movable clamp 3 and return it to its original position. In the initial position, the movable clamp 3 is clamped again and the auxiliary clamp 5 is opened. The machine is ready for welding. After the actual welding (fusion and precipitation) is completed, the auxiliary clamp 5 is clamped, the pressure is removed from the movable clamp 3 and the weld reinforcement is cut off by moving the movable clamp 3 with a device for removing the reinforcement towards the fixed clamp 1. Then, the movable clamp 3 is unclenched and moved to the starting position. In this case, the welded parts 6 and 7 continue to be held in the fixed 1 and auxiliary 5 clamps until the welded joint cools down. After cooling the welded joint to the required temperature, the stationary 1 and auxiliary 5 clamps are opened. The welding cycle is completed.

From the above analysis of the operation of the machine shows that the proposed technical solution differs from the prototype by its novelty and significant differences and allows you to expand the technological capabilities of welding equipment. Especially useful may be the use of the proposed solution when welding the rails with interference, which is beginning to be used on the railways of the Russian Federation.

To check the feasibility of using the proposed technical solution, the K-355 rail welding machine was re-equipped, which was additionally equipped with an auxiliary clamp, rigidly connected to the fixed clamp; while the movable clamp was located between the fixed and auxiliary clamps.

Welded two links of rails P65 with a length of 25 m each. To simulate interference welding, one of the links was rigidly fixed, and the second was forced with a spring. The gap between the ends of the rails in the unstressed state was 50 mm.

The rails were clamped in the fixed and movable clamps, moving the movable clamp towards the fixed clamp, set the gap between the rails 1 mm, clamped the auxiliary clamp, unclenched the movable clamp and moved it to its original position to start welding, clamped the movable clamp again, unclenched the auxiliary clamp, performed a welding cycle, clamped the auxiliary clamp, unclenched the movable clamp and performed the operation of removing the reinforcement, held the welded rails in the stationary and auxiliary clamps until the welded joint cools down I am, after which they were decompressed and the machine has been removed from the welded rails.

The procedure described above confirmed the possibility of using the machine according to the invention for welding long products.

Claims (1)

Machine for flash butt welding by fusion of long products, comprising a fixed clamp, guides, a movable clamp mounted to move relative to the fixed clamp along the guides along the longitudinal axis of the parts to be welded, a device for removing the reinforcement of the weld, characterized in that it further comprises an auxiliary clamp, rigidly connected to the fixed clamp and configured to hold the parts to be welded during the operation to remove the reinforcement of the welded joint wa during the cooling of the latter and when pulling parts during auxiliary operations before welding, and the movable clamp is located between the stationary and auxiliary clamps.