EA024744B1 - Method for producing a flux-cored wire with an increased powdered filler density - Google Patents

Abstract

The invention relates to the metallurgical engineering industry, and to a method for producing a flux-cored wire with an increased powdered-filler density. The problem addressed by the invention is that of increasing the quality of the flux-cored wire by increasing the density of the filler thereof, the uniformity of distribution of said filler in the transverse and longitudinal directions, and of increasing the operational characteristics of the wire produced. The problem is solved in that, in the method for producing the flux-cored wire with an increased powdered-filler density, comprising continuous forming a U-shaped profile from a metal strip, with simultaneous filling said profile with a powdered filler, with the latter being smoothed out and the profile being preliminarily sealed, forming a closed tubular casing profile with a grooved lock and reducing said profile, according to the invention the preliminary sealing and smoothing out are carried out on a vibrating device, and the reduction is undertaken in a double three-roller die, wherein, in the first group of rollers, three deep corrugations are formed, said corrugations reducing the cross section of the profile to 20%, wherein one of the corrugations is arranged close to the grooved lock, and, in the second group of rollers, which are shifted by 60° along the forming axis relative to the first rollers, the profile is calibrated with simultaneous compression of the three corrugations formed and with the possibility of reducing the cross section of the profile to 25%.

Description

The invention relates to metallurgical engineering, and in particular to a method for producing flux-cored wire with an increased density of powder filler.

State of the art

A known method of manufacturing a flux-cored wire [1], comprising forming a sheath of a metal strip with flanging its edges to obtain a double locking connection, filling the workpiece with powder materials, rolling the wire with the formation of a longitudinal internal corrugation in the shell, located diametrically opposite to the castle connection with the subsequent closure of the sides of the corrugation , while the shell is formed of an open oval shape with a horizontal major axis and the formation of a guide gap between the edges flanging, and when rolling in the sheath of the wire form an additional longitudinal internal corrugation adjacent to the castle connection.

To implement this method, the forming mill includes 12 working two-roll stands.

The disadvantages of this method.

1. After filling the powder into the molded gutter, no device is provided for leveling and pre-compaction, which negatively affects the uniformity of the filling of the flux-cored wire.

2. Increasing the density of the powder by forming a longitudinal internal corrugation of a triangular section diametrically opposite the castle connection, followed by closing the sides of the corrugation and increasing the strength of the castle connection by forming an additional longitudinal internal corrugation adjacent to the castle connection, complicate the calibration of the rolls and increase the number of stands.

3. The need to use 12 working stands increases the dimensions and metal consumption of the mill, capital and operating costs for the repair of calibrated rolls.

Closest to the proposed one is a method of manufacturing a flux-cored wire [2], which comprises forming an I-shaped groove from a continuously fed tape with vertical walls of different heights in three horizontal stands with a drive of lower rolls alternating with non-driven vertical stands, feeding a powder filler from the hopper into the groove and its compaction, the formation of a closed tubular billet with a seam in three horizontal stands with the drive of both rolls and in seven non-driven vertical stands and reduction tube billet with a total reduction of the outer diameter to 4% in one horizontal stand with two drive rolls and a non-driven three-roll stand with the simultaneous execution of three inner corrugations evenly spaced along its perimeter, one of which is placed in close proximity to the folded seam and 2% reduction.

To implement this method, the forming mill includes 20 stands, of which 7 horizontal two-roll, 12 vertical two-roll and 1 three-roll mill.

The disadvantages of this method.

1. The reduction of the tube billet with a total decrease in the outer diameter to 4% in one horizontal stand and one three-roll stand is not enough to obtain a high powder density.

2. To implement this method requires a significant number of stands, which increases the dimensions and metal consumption of the mill, capital and operating costs.

3. The implementation of three internal corrugations along the perimeter of the cored wire with a reduction of 2% provides only the stiffness of the sample, little effect on the compaction of the powder and can not ensure uniform distribution over the cross section of the wire.

Disclosure of invention

The objective of the invention is to improve the quality of cored wire by increasing the density of its filler, the uniformity of its distribution in the transverse and longitudinal directions, as well as improving the operational characteristics of the finished wire.

The problem is solved due to the fact that in the method for producing a flux-cored wire with an increased density of a powder filler, comprising continuously forming an I-shaped profile from a metal tape while filling it with a powder filler with leveling and pre-sealing, forming a closed tubular sheath profile with a fold lock and reduction, according to the invention powder compaction and leveling are carried out on a vibrating type device, and reduction of a closed tubular profile from the halyard A key lock is produced in a double three-roller die, and in the first group of rollers three deep corrugations are formed, which reduce the cross-section of the profile to 20%, while one of the corrugations is located in close proximity to the fold lock, and in the second group of rollers shifted by 60 ° along the molding axis relative to the first ones, the profile is calibrated while simultaneously pressing three formed corrugations and the possibility of reducing the cross-sectional area of the profile to 25%.

This method of reducing the closed tubular profile of the shell with a seam lock in a dual three-roller die makes it possible to uniformly increase the density in the first group of rollers

- 1,024,744 powder filler in the cross section due to the deep penetration of the profile of the three corrugations and increase the rigidity of the shell, while one of the corrugations, located in close proximity to the rebate lock, ensures the reliability of the lock connection, and in the second group of rollers shifted by 60 ° forming axes relative to the first ones, calibrate the profile with simultaneous preloading of three formed corrugations, providing an additional increase in the density of the filler and the accuracy of the dimensions of the finished wire.

Enumeration of figures.

FIG. 1 is a diagram of the manufacture of cored wire according to the proposed method.

FIG. 2 - double three-roller die - isometry.

FIG. 3 - double three-roller die - side view.

FIG. 4 - double three-roller die - section AA in FIG. 3.

FIG. 5 - dual three-roller die - view B in FIG. 3.

The implementation of the invention

A method of obtaining a flux-cored wire with an increased density of the powder filler is as follows.

From the unwinding device 1 (Fig. 1), the metal tape 2 is fed into a horizontal guide stand 3, in which the tape is edited (pos. A). In the next two horizontal stands 4 and 5, its edges are flanged to the lock connection (pos. B) and the I-shaped profile (pos. C) is formed, the filling of which with powder filler is made from the hopper 6 by a special feeding device 7, combined with the screw mechanism, which prevents powder caking (pos. g). Next, the powder filler on the vibrating type device 8 is pre-compacted and leveled (pos. E), after which, in two vertical stands 9 and 10, the edges of the profile are reduced (pos. E) and bent (pos. G). In the last horizontal stand 11, the final formation of the seam lock joint (pos. H) takes place and the closed tubular profile enters the twin three-roll die 12 for reduction.

In the first group of rollers 13 of the double three-roller die 12 (Fig. 2-5), the cross-section of the profile is reduced to 20% by penetrating three corrugations 14 deeper, and the shell does not contact the housing 15, which prevents the formation of hardening and helps to preserve its plastic properties ( pos. and). This reduction scheme allows you to uniformly increase the density of the powder filler in the cross section, and one of the corrugations 14, located in close proximity to the rebate lock, keeps it from opening. In the second group of rollers 16, shifted by 60 ° along the molding axis relative to the first, the profile is calibrated while simultaneously pressing three formed corrugations 14, providing an additional increase in the density of the filler and the accuracy of the size of the wire (pos. K).

Finished flux-cored wire enters the reeling device 17 to form a riot from it.

Thus, this method allows to ensure a high density of the powder filler and its uniformity in the transverse and longitudinal directions, to preserve the ductility of the shell and significantly increase its rigidity, to ensure the reliability of the castle joints and reduce the number of stands of the forming mill.

The resulting flux-cored wire with a diameter of 15 mm with three deep corrugations, a 08 kp steel sheath of 0.4 mm thickness, a filler of SK 30 with a particle size of 0-1.6 mm and an increased relative density of 0.86 was tested to determine its operational properties. The tests were carried out in laboratory conditions and repeated the process of the life cycle of a wire from the moment of its manufacture to dissolution in a liquid metal. The results showed that the wire is perfectly twisted (1-1.5 vol per 100 mm of length), bends (minimum radius 50-100 mm), flattened (crimping 4 mm), bends (4-8 times), while opening the lock connection or destruction does not occur. This indicates the preservation of the plastic properties of the sheath and the wire as a whole, despite its increased density and rigidity.

Information sources.

1. USSR author's certificate No. 1754382, published on 08/15/1992.

2. RF patent No. 2292254, published January 27, 2007.

Claims (2)

A method of producing a flux-cored wire with an increased density of a powder filler, including the continuous formation of an I-shaped profile from a metal tape with its simultaneous filling with a powder filler with leveling and pre-sealing, the formation of a closed tubular sheath profile with a rebate lock and reduction, characterized in that the powder is pre-compacted and leveling lead on the device of the vibrational type, and the reduction of the closed tubular profile with a rebate lock is made in dual th three roller die, and carried out the formation of three deep corrugation rollers in the first group, providing - 2 024744 reducing the cross-section of the profile to 20%, while one of the corrugations is located in close proximity to the folding lock, and in the second group of rollers shifted 60 ° along the molding axis relative to the first, the profile is calibrated while three formed corrugations are pressed together with the possibility of reducing the cross-sectional area of the profile to 25%.