RU139690U1 - STRAIGHT PIPE WELDING MILL - Google Patents

Abstract

A mill for welding longitudinal joints containing molding stands, a high-frequency heater, a rod with a ferromagnetic core fixed to it, welding rolls and a weld cooler located above the point of convergence of the edges of the pipe billet, characterized in that it is equipped with two carriages located in cases fixed to molding stands, and mounted in guides made on carriages with two rods connected to a rod on which a ferromagnetic core is fixed, one of the rods being installed behind with a magnetic core, it is connected to the rod by a pin and fixed in the guide of the first carriage by nuts, and the other rod is connected to the free end of the rod by means of a coupling and is fixed in the guide of the second carriage by a screw, while the first carriage is fixed in the guides of the case by nuts, and the second carriage is connected to the case a screw, and on the first carriage there is a scale for measuring the vertical movement of the rod with a ferromagnetic core, and an arrow is fixed on the front link.

Description

The utility model relates to pipe welding production, and more specifically to mills for welding longitudinal joints.

Famous mill for welding longitudinal pipes, see the book Shevakin Yu.F., Gleyberg A.Z. Pipe Production, Metallurgy, Moscow, 1968, pp. 298-300.

This mill contains molding stands, a high-frequency heater, a ferromagnetic core, welding rolls and a cooling system. The ferromagnetic core is fixed to the plate.

A disadvantage of the known longitudinal weld pipe mill is that due to the rigid fastening of the rod with the ferromagnetic core on the plate, it is not possible to adjust the gap between the ferromagnetic core and the inner surface of the tube stock during welding.

Of the known mills for welding longitudinal joints, the closest in technical essence is the mill described in RF patent No. 2135317, class. B21C 37/08, claimed 06/22/98, publ. 08/27/99 g.

The known mill contains molding stands, welding rolls, a high-frequency heater, a ferromagnetic core mounted on the rod, and a weld cooler. The weld cooler is located above the point of convergence of the edges of the pipe billet.

A disadvantage of the known construction of a longitudinally-welded pipe mill is that it is not possible to adjust the position of the gap between the ferromagnetic core and the inner surface of the tube stock during welding due to the rigid fastening of the rod with the ferromagnetic core and the presence of partitions installed on the fixed rod before and after the point of convergence of the edges , which reduces the quality of the welded joint, the welding speed, and hence the productivity of the mill.

Another disadvantage of the known construction of a longitudinally welded pipe mill is that the heated edges of the pipe billet are constantly in the liquid medium, which leads to heat loss of up to 15% at the edges of the pipe billet and the necessary increase in pressure by the welding rolls on the edges of the pipe billet, which leads to the formation of internal grata, the elimination of which requires additional operations and costs. In addition, the service life of the welding rolls is reduced.

The objective of this utility model is to create a mill for welding longitudinal joints, which allows to ensure the quality of the welded joint, to increase the welding speed and increase the productivity of the mill.

The task is achieved in that the Mill for welding longitudinal pipes containing molding stands, a high-frequency heater, a rod with a ferromagnetic core attached to it, welding rolls and a weld cooler located above the convergence point of the edges of the tube stock, according to a utility model, is equipped with two carriages located in housings mounted on molding stands and mounted in guides made on carriages with two rods connected to a rod on which ferromagnetic sulfur is fixed Decnik. One of the front rods is installed behind the ferromagnetic core, connected to the rod by a pin and fixed in the guide of the first carriage by nuts, the other rod is connected to the rear free end of the rod by means of a coupling and is fixed in the guide of the second carriage by means of a screw. The first carriage is fixed in the guides of the housing with nuts, and the second carriage is connected to the housing by a screw, while on the first carriage a scale for measuring the vertical movement of the rod with a ferromagnetic core is installed, and an arrow is fixed on the front link.

Such a constructive embodiment of a longitudinally welded pipe mill allows us to ensure the quality of the welded joint, increase the welding speed, productivity, and also reduce the pressure on the welding rolls.

This is achieved due to the possibility of changing the position of the ferromagnetic core during the welding process, bringing it as close as possible to the edges of the tube billet being welded, which will allow us to concentrate the current energy on the edges and reduce their heating zones, and to quickly produce the necessary heating of the tube billet edges for high-quality welding increase the welding speed, and therefore the productivity of the mill.

To explain the utility model, a specific example of the implementation of the utility model is given below with reference to the accompanying drawings, in which:

in FIG. 1 - shows a mill for welding longitudinal pipes, general view;

in FIG. 2 is a view along arrow A in FIG. one;

in FIG. 3 is a view along arrow B in FIG. 2;

in FIG. 4 is a view along arrow B in FIG. 3;

in FIG. 5 - place G in FIG. one;

in FIG. 6 is a view along arrow D in FIG. 5.

A weld pipe for welding longitudinal pipes contains molding stands 1, a high-frequency heater 2, a rod 3 with a ferromagnetic core fixed to it 4, and welding rollers 5. Above the welding rollers 5, above the convergence point of the edges of the pipe billet, weld cooler 6 is located. Mounted on the molding stands 1 housings 7, 8 are two carriages 9, 10, in the guides of which are mounted two rods 11, 12 connected to the rod 3. The carriage 9 is fixed in the guides of the housing 7 with nuts 13, and the carriage 10 is connected to the housing 8 by means of a screw 14. Link 11 is mounted behind the ferromagnetic core 4, connected to the rod 3 by a pin 15 and fixed in the carriage guide 9 by nuts 16. The rod 12 is connected to the rear free end of the rod 3 by means of a coupling 17 and secured to the carriage guide 10 by means of a screw 18. To measure the vertical movement of the rod 3 with a ferromagnetic core 4, a scale 19 is installed on the first carriage 9, and an arrow 20 is fixed on the rod 11.

A mill for welding longitudinal pipes works as follows.

The tape enters the rolls of the molding stands 1, where it is formed into a tube billet 21 with open edges, inside of which there is a ferromagnetic core 4 with a gap in internal diameter, mounted on the rod 3. Then the tube billet 21 enters a high-frequency heater 2, the turns of which cover the tube the workpiece 21 with a gap along the outer diameter and heat its edges. In this case, the high-frequency heater 2 and the ferromagnetic core 4 are located in the same plane. By adjusting the position of two rods 11, 12 in the carriages 9, 10 with nuts 16 and screw 18, we control the vertical position of the rod 3 inside the pipe billet 21 using the scale 19 and arrow 20 and thereby bring the ferromagnetic core 4 closer to the edges of the billet 21. At the minimum permissible the gap between the edges of the workpiece 21 and the ferromagnetic core 4, the entire welding current is directed along the welded edges, melting the edges to a depth of tenths of a millimeter. In addition, adjusting the position of the carriages 9, 10 with the help of nuts 16 and screw 18, we select the desired position of the ferromagnetic core 4 from the point of convergence of the edges in the welding rolls 5. First, water is supplied to the core 3, on which the ferromagnetic core 4 is fixed, and intensive cooling is performed core during welding. The workpiece 21 with heated edges enters the welding rolls 5, where it is crimped and welded into a pipe. At the same time, the converging edges of the tubular billet 21 are watered with water from the seam cooler 6, providing a steam jacket in the medium of which the welding process takes place.

The proposed mill for welding longitudinal joints in comparison with the known ones due to the maximum concentration of current energy on the edges of the tube billet allows reducing their heating zone, ensuring their fast heating in a minimum time, thereby increasing the welding speed, weld quality and productivity.

Claims (1)

A mill for welding longitudinal joints containing molding stands, a high-frequency heater, a rod with a ferromagnetic core fixed to it, welding rolls and a weld cooler located above the point of convergence of the edges of the pipe billet, characterized in that it is equipped with two carriages located in cases fixed to molding stands, and mounted in guides made on carriages with two rods connected to a rod on which a ferromagnetic core is fixed, one of the rods being installed behind with a magnetic core, it is connected to the rod by a pin and fixed in the guide of the first carriage by nuts, and the other rod is connected to the free end of the rod by means of a coupling and is fixed in the guide of the second carriage by a screw, while the first carriage is fixed in the guides of the case by nuts, and the second carriage is connected to the case a screw, and on the first carriage there is a scale for measuring the vertical movement of the rod with a ferromagnetic core, and an arrow is fixed on the front link.

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