RU2321479C1 - Machine for butt welding of heated blanks - Google Patents

Abstract

FIELD: welding processes and equipment, namely apparatuses for butt welding of heated square cross-section blanks at continuous rolling process.

SUBSTANCE: machine includes movable car to which stationary housing is secured, movable housing mounted on guides of stationary housing, two mutually normal apparatuses for removing fins, two upsetting hydraulic cylinders for moving movable housing, devices for clamping blank ends, electric current supply electrodes, welding transformers and car. Clamping devices are arranged in movable and stationary housings and they are in the form of symmetrical systems of double-arm levers. Electrodes are mounted on ends of double-arm levers turned to blanks and they have recesses respectively for embracing blanks along perimeter and for forming clamping effort along diagonal of square cross section of blanks. Welding transformers are secured to stationary housing and they are joined with electric current supply electrodes. Car is mounted on stationary housing and it is joined with movable housing. Each clamping device is provided with guides and with slides arranged in guides of clamping devices and it is jointly coupled with other ends of double-arm levers.

EFFECT: improved quality of welding due to providing matching of symmetry axes of welded blanks, lowered wear degree of guides of movable housing, enhanced dynamics characteristics of machine.

2 dwg

Description

The invention relates to the field of rolling production, and more particularly to methods for connecting the ends of workpieces by butt welding for endless rolling.

To carry out endless rolling, before entering the roughing group, the cages of the workpiece are interconnected by flash butt welding by fusion into an endless strip. Welding is carried out on butt welding machines. Known welding machines used for welding heated billets, providing the docking and alignment of the welded ends, their welding and shearing, for example, a docking machine company "Daniel". See the catalog of the company "Daniel" Italy, publication of March 12, 2001, pp. 3-12.

A butt welder for connecting hot workpieces is made for installation on a moving part of a volatile butt welder for blooms. It should move along the axis of the unit synchronously with the movement of the workpieces fed into the mill. The path traveled by the machine depends on the welding cycle time. When approaching the rear end of the rolled billet to the zone of the welding machine, a command to accelerate the machine should be given from the corresponding sensor. After accelerating the machine to the workpiece speed, tachogenerators should compare the paths traveled by the workpiece and the welding machine. It is necessary to make the appropriate correction of the speed of the welding machine and, after ensuring the necessary departure of the workpiece from the fixed clamp, give a command to grab it. At the same time, a command should be given to issue the next workpiece from the furnace, which is fed all the way into the rolled workpiece, after which it is necessary to capture the front end of the next workpiece with the movable clamp of the machine. The magnitude of the departure of the ends of the workpieces is provided with an accuracy of 1.5 mm.

After completing the installation of the ends of the workpiece, a command should be given to start welding. In this case, welding transformers are turned on and the welding process begins. After the necessary allowance is melted, the precipitation drive is switched on, which ensures the plastic deformation of the heated metal and the formation of the compound. At the same time, welding transformers are switched off. The clamps are moved apart and the welding machine must return to its original position.

However, the kinematic diagram of the machine ensures that the welded ends are aligned only along two faces, while a step is formed on the opposite sides, which affects the strength of the welded joint and makes it difficult to cut the burr. In addition, this scheme does not allow to bring the welding transformer closer to the welding zone, which increases the dimensions and weight of the welding machine. This does not allow to achieve the technical result of the invention. The closest in technical essence is a machine for flash butt welding of heated billets. See the patent of the Russian Federation for a utility model, application No. 2003134380/20, patent No. 37959 MKI7 V23K 11/04.

This machine contains two tick-shaped clamping devices for clamping the abutting ends of the workpieces and their rapprochement, one of which is fixed in a stationary case, and the other is fixed in a movable case installed with the possibility of movement relative to the fixed case, both cases with clamping devices are fixed on a movable trolley, installed with the ability to move parallel to the axis of the workpieces. The clamping devices are made in the form of a symmetrical system of two-arm levers mounted on separate axes and equipped with clamping current-carrying shoes mounted on the ends of the levers facing the workpiece and in contact with the surface at the time of clamping. Welding transformers connected by flexible tires with current-carrying shoes of clamping devices. Two devices for the removal of burrs, equipped with cutters installed between the fixed and movable bodies. The surfaces of the clamping current-carrying shoes facing the workpiece have recesses in the shape of the outer surface of the workpiece, at the time of clamping the end of the workpiece around the entire perimeter of its cross section, and the clamping force is applied along the diagonal of the square section of the workpiece.

Welding transformers are fixed in a fixed housing with a clamping device.

The movable housing with a clamping device is provided with two hydraulic cylinders for moving it relative to the stationary housing, and the axis of the hydraulic cylinders are parallel to the axis of the workpiece on both sides of it. This car is taken as a prototype.

The disadvantage of this machine is also the combination of the ends of the welded heated workpieces along two faces, as well as increased wear of the guides and poor dynamics of the machine due to the resistance in the guides from friction.

The task and the technical result are to ensure the alignment of the axes of symmetry of the two welded workpieces, as well as to reduce the wear of the guides of the movable housing and thus improve the dynamics of the machine.

This has been achieved by new technical solutions that are in a causal relationship with the technical result.

A machine for butt welding of heated square billets in an endless rolling process, comprising a movable trolley with a fixed casing fixed to it, a movable casing mounted on the guides of the fixed casing, two mutually perpendicular devices for removing burrs, two draft cylinders for moving the moving casing, clamping devices for clamping the ends of workpieces installed in a movable and fixed body and made in the form of a symmetrical system of two-arm levers, current-carrying Electrode mounted on the ends of two-armed levers, facing the workpieces, and formed with a recess to cover the workpieces on the perimeter and towards the clamping force of the diagonal of square section billet, and welding transformers mounted in the stationary housing and connected to the current-supplying electrodes.

Distinctive features of the prototype are the following:

- the machine is additionally equipped with a trolley mounted on a fixed casing and connected to the movable casing, and each clamping device is equipped with guides and sliders, while the sliders are installed in the clamping guides and pivotally connected to the other ends of the two-arm levers.

The above set of essential features in comparison with the prior art allows us to conclude that the proposed technical solution meets the criterion of "novelty." At the same time, the set of distinguishing features leading to the solution of the problem, does not explicitly follow from the prior art, therefore, the proposed technical solution meets the criterion of "inventive step". Figure 1 shows a machine side view; figure 2 is a section along aa. The machine comprises a movable trolley 1 and a fixed body 2 mounted on it, in which the guides 3 are fixed.

The movable housing 4 is mounted on the rails 3 and connected to the trolley 13 mounted on the stationary housing 2 which ensures ease of movement of the movable housing and improved dynamics of the machine, this achieves the technical result of the invention. Draft hydraulic cylinders 10 are mounted on a fixed housing, and their rods are connected to a movable housing. A carriage 13 is mounted on the stationary body, in which the rod 15, spring 18, adjusting screw 16, lever 17 are assembled. Two mutually perpendicular devices 9 for removing the burr, two welding transformers 7 with current leads 8 and electrodes 6, which have recesses to cover the workpiece. In each case, clamping devices are assembled, which are a symmetrical lever system consisting of levers 5, 20, guides 12, sliders 11 and hydraulic cylinder 14. This ensures the achievement of a technical result, which consists in combining the symmetry axes of both welded workpieces. The machine operates as follows.

The heated billet is fed into the machine from the side of the rolling casing at the speed of the first stand of the rolling mill and, when its rear end is aligned with the knife of the device for stripping 9, the machine starts to move at the same speed. At the same time, pressure is supplied to the rod cavity of the hydraulic cylinder 14, the rod of which, moving, moves the slider 11. The slider 11, moving in the guides 12, simultaneously rotates both pairs of levers 5, 20 of the clamping devices, the electrodes 6 clamp the rear end of the first workpiece, with a clamping force P, the diagonal square section of the workpiece 19. The other workpiece is fed all the way forward by the front end into the rear end of the first workpiece, the front end of the second workpiece is clamped by the electrodes of the moving casing similar to the clamp in rated housing. The slider 11 in each housing when clamping the workpieces is moved in the rigid guides of each housing. The electrodes 6 using the lever system provide clamping and alignment of the axis of symmetry of the ends of the welded workpieces 19, distributing the maximum deviations of the dimensions of the workpieces on both sides.

Thus, the above information indicates the possibility of using the invention in the form as described in the claims using the known and proposed tools described above in the application. Therefore, the claimed invention meets the requirement of "industrially applicable under applicable law." According to the invention, design and technological documentation is developed. A prototype is manufactured and tested. The tests gave a positive result.

Claims (1)

A machine for butt welding of heated square billets in an endless rolling process, comprising a movable trolley with a fixed casing fixed to it, a movable casing mounted on the guides of the fixed casing, two mutually perpendicular devices for removing burrs, two draft cylinders for moving the moving casing, clamping devices for clamping the ends of workpieces installed in a movable and fixed body and made in the form of a symmetrical system of two-arm levers, current-carrying electrodes mounted on the ends of the two-arm levers facing the workpieces and made with a recess for covering the workpieces along the perimeter and in the direction of the clamping force along the diagonal of the square section of the workpieces, and welding transformers fixed in a fixed housing and connected to the current-carrying electrodes, characterized in that it is additionally equipped with a trolley mounted on a fixed housing and connected to a movable housing, and each clamping device is provided with guides and sliders, while the sliders are installed oval in the guides of the clamping devices and pivotally connected to the other ends of the two-arm levers.

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