RU2179103C2 - Line for making powder wire in metallic cover - Google Patents

Abstract

FIELD: metallurgy, namely manufacture of powder wire for treatment of melt steel and cast iron by means of chemically active components. SUBSTANCE: line includes apparatus for uncoiling belt in the form of rotary platform supporting two similar units. Shaping mill includes vertical and horizontal shaping stands with metering device for filling trough with powder, said trough is made of band material. Mill is provided with guide for band in the form of bracket with movable frame. Horizontal shaping stands are non-driven ones, that is why it is possible to reduce energy consumption and maintenance cost of line. In apparatus for closing lock in front of its inclination position there is roller grooved pass for reducing closed lock in vertical position. EFFECT: enhanced quality of powder wire due to improved reliability of lock joint. 6 dwg

Description

 The invention relates to a device for the manufacture of cored wire used in metallurgy, in particular in the production of powder modifiers for the treatment of molten steel and cast iron with chemically active components.

 A known line for the production of flux-cored wire in a metal sheath for out-of-furnace steel processing, comprising a sequentially unwinding device, a forming mill, including four horizontal and two vertical forming stands with non-driven rolls, a feeder-dispenser for feeding the powder filler into the workpiece, a monolithic fiber for reduction and wire calibration, pulling drum (drum-type drawing mill), as well as a reeling device for laying wire in riots [1].

 The manufacture of wire involves the continuous formation of a tape into a U-shaped trough with its filling with a powder filler, the creation of a closed tubular profile with a zeta-shaped locking connection and the reduction-calibration of the resulting workpiece through a monolithic fiber, while all of the above operations are performed in non-driven forming and bending devices by pulling the original tape with a drawing pulling drum installed at the end of the forming mill.

The disadvantages of this line
1. The presence on the rolls of the forming stands installed behind the dispenser of shaped gauges that ensure the simultaneous formation of a closed tubular shell and the formation of a lock connection does not allow to stably obtain the required reliability of the lock due to the uneven development (wear) of the “lock” and “pipe” sections the working surface of calibers that do not have any separate adjustment.

 2. The lack of a device for leveling and compaction of the powder in the formed trough of the workpiece, which does not allow to obtain a wire with a large fill factor and uniform compaction along the length of the wire.

 3. The use of a drawing pulley drum as a drive of the forming mill leads to deformation (ovality) of the cross section of the reduced finished wire on the drum, which significantly reduces the accuracy of the wire.

 4. A monolithic die installed in front of the pulling drum does not allow significant reduction of the workpiece, and also leads to the need for technological lubrication during drawing, which degrades the quality of the wire due to the presence of grease residues on its surface.

 The closest to the claimed purpose and essential features line for the production of flux-cored wire in a metal sheath, containing a sequentially unwinding device, a forming mill and a winding device [2]. On the unwinding device there is a cassette with a roll of the original tape, from which the cored wire is formed. The forming mill contains four duo working stands, a tape type dispenser, a powder compactor, a lock closing device, a three-roll mill stand and a calibrating three-roll draw. All mill stands are driven.

In the first forming stands, the initial tape is shaped into a U-shaped trough, into which a powder filler is filled with a dispenser, after which the workpiece falls into the caliber of the compactor rolls, then the workpiece with a compacted charge enters the work rolls of the vertical stand, where the U-shaped workpiece is rolled into a tubular a blank with a flanging of the edges of the gutter for a lock connection. The tubular billet enters the device for closing the lock, where, using horizontal rollers, the flanging element is folded down by 40-60 ^o , and the vertical rollers finalize the lock and tilt it to the right by 40-50 ^o . After that, the workpiece enters the caliber of the horizontal stand, where the inclined lock is pressed (upset) into the tubular section with the formation of a zeta-shaped castle connection. Next, the rough tubular profile is crimped in a reducing three-roll stand into a round profile, which is then calibrated (stretched) to the final diameter of the finished wire in a three-roller wire by the force of a reel drum when winding the wire into a riot. After the end of the tape in the cassette, the line stops, the cassette on the unwinder is replaced, the end of the new tape is welded with the end of the tape located in the first stand of the mill, the seam is cleaned with an emery wheel, and the line is put into operation.

 The disadvantages of the prototype.

 1. The need to replace the cassette with the original tape after stopping the line increases the downtime of the line and reduces its productivity.

 2. The lack of a clear orientation of the tape between the unwinder and the first stand of the forming mill does not allow to obtain stable dimensions of the castle connection, thereby impairing its reliability.

 3. The use of forming stands with drive rolls in the forming mill complicates the kinematic scheme of the mill, increases its overall dimensions, energy consumption, maintenance costs and cost of the wire produced.

4. The use of calibers in the locking device of the lock, in which the horizontal rollers of the first bend the flanging element downwards by 40-60 ^o , and the vertical rollers of the second carry out both the final closing of the lock and its inclination to the right by 40-50 ^o , which does not allow to reliably close the lock compound.

 The invention solves the problem of increasing the productivity of the line by reducing downtime when replacing the roll with the original tape, reducing the overall dimensions of the line, energy consumption and the cost of its maintenance through the use of non-driven forming stands, improving the quality of the wire by increasing the reliability of the lock connection.

 The problem is solved in that in the design of the prototype, containing sequentially arranged: a tape unwinding device, a forming mill, consisting of vertical and horizontal forming stands with a metering device for filling powder in the gutter formed from the tape, a device for closing the lock, a reducing unit, and a winding machine wire riot made significant changes. The inventive line is equipped with a two-position tape unwinding device, made in the form of a rotary platform with two identical nodes installed on it, each of which contains a three-jaw clamp, a stationary and removable cheeks, and a braking mechanism. In front of the first horizontal forming stand, designed to form the lock flags, a tape guide is installed, made in the form of a bracket with a movable frame, having two pairs of rollers, the upper of which is made with the possibility of spring pressing to the lower rollers having flanges, the distance between which is equal to the width of the original tapes. In this case, the forming stands are non-driven, and a roller gauge is installed in the device for closing the lock in front of its tilt position to compress the lock in a vertical position after it is closed.

In FIG. 1 schematically shows a production line for flux-cored wire (side view), combined with a wire profile formation scheme (letter designations from "a" to "m");
in FIG. 2 - tape unwinding device (top view);
in FIG. 3 - tape guide (side view);
in FIG. 4 - horizontal rollers of the locking device, section AA;
in FIG. 5 - vertical rollers of the locking device, section BB;
in FIG. 6 - vertical rollers of the locking device, section BB.

 The flux-cored wire production line contains a sequentially located tape unwinding device 1, a forming mill 2, consisting of vertical and horizontal forming stands with a metering device for filling powder in the gutter formed from the tape, a device for closing the lock, a reducing unit, and a wire riot winding machine 3.

 The tape unwinding device (Fig. 2) is made on-off in the form of a rotary platform 4 with two identical nodes installed on it, each of which contains a three-jaw clamp 5, a braking mechanism 8, a stationary 6 and a removable 7 cheeks. This embodiment of the tape unwinding device allows the use of rolls of the original tape of various sizes in diameter and width and reduces the time to replace the rolls of the original tape.

 The forming mill 2 contains a belt guide 9, three horizontal working stands of the duo with the cantilever arrangement of the rolls 10, a horizontal stand 11 of the drive of the conveyor-dispenser 12, a powder compactor 13, a stand forming a lock 14, a horizontal stand 15 and two vertical stands 16 and 17, forming a locking device (Fig. 1, 4, 5 and 6), reducing the horizontal stand 18 and calibrating the three-roll draw 19.

 The guide tape 9 is fixed in front of the first forming stand 10 and is made in the form (Fig. 3) of the bracket 20 with a guide groove, an adjusting screw 21 and a locking bolt 22. On the bracket 20 are installed lower 23 and two upper frames 24, while in the lower frame on the axes mounted on the rolling bearings, fixed two rollers 25, made with flanges, the distance between which is equal to the width of the original tape, and the upper frame 24 with the rollers 26 mounted on the axles in the rolling bearings is made with compression springs 27. In addition, on the lower frame 23 strengthened on a nut (not shown) placed in the guide groove (not shown) of the bracket 20. This embodiment of the guide tape allows you to ensure the exact direction of the original tape in the first caliber of the forming mill to obtain a stable size flanging under the locking connection.

 The locking device consists of a caliber of horizontal rollers 28, a caliber of vertical rollers 29 and 30. This embodiment of the castle device allows you to reliably close the castle connection.

Preparation for work and the operation of the line in the production of cored wire is as follows. When refueling the mill with a tape (Fig. 1), in all stands the gap between the rolls is established, increased by 3-20 mm in comparison with the working calibration. The front end of the tape of the original roll is set in the guide of the tape, held between the rollers of all stands, the opened rollers of the three-roller draw and mounted on a coil of a wire winding machine. The upper rolls of the working stands 10 are lowered to the operating position, the conveyor belt drive is turned off, the drive of the wire winding machine is turned on at the filling speed. After passing the portion of the tape with the formed flags, the rolls of the stands 11, 13, 14, 15, 16, 17, the reducing stand 18 and the calibrating three-roll die 19 are successively brought to the operating position. In addition, when the blank “g” passes through the drive stand 11, it turns on the drive of the conveyor belt-dispenser 12 and the filling of the powder. When the wire formed with the filler reaches the coil of the wire winding machine, the line stops, the cutting end of the tape is cut off and removed from the coil, and the end of the wire is attached to the coil. The line is ready to go. In the process, the original tape from the roll is fed into the forming mill 2 lines (Fig. 1, 4, 5, 6). In the first forming stands, the original ribbon is sequentially shaped into sections “b”, “c” and “g”. Powder filler is poured into the U-shaped gutter "g" by the conveyor-dispenser 12, after which the workpiece "d" falls into the caliber of the rolls of the seal 13, where the upper roll levels and compacts the powder covered by the conveyor-dispenser 12. Then the workpiece "e" with a compacted charge enters the work rolls of the vertical stand 14, where the U-shaped workpiece "e" is rolled up into a tubular workpiece "g" with flanged edges of the trench for the locking connection. The tubular blank "g" enters stand 15, where, using horizontal rollers 28, the flanging element "o" (pos. "G") is bent down 75 - 80 ^o (pos. "Z"), then the blank "z" enters stand 16, where the lock 31 (pos. "and") is crimped with the help of vertical rollers 29, after which the workpiece "and" enters stand 17, where, with the help of vertical rollers 30, the lock 31 tilts 55-60 ^{o to the} left (pos. "to"). After that, the blank "k" enters the caliber of the horizontal stand 18, where the inclined lock is pressed in (upset) and the blank is reduced into a tubular section "l" with a formed zeta-shaped locking connection. Next, the rough tubular profile "l" is calibrated to the final diameter of the finished wire "m" in the three-roll wire 19. The finished wire is wound into a bay on the wire winding machine 3 (Fig. 1).

After the end of the tape at the position of the device for unwinding the tape 1 line stops, the rotary platform of the device is rotated 180 ^o around its axis and stops. The end of the new tape is welded to the end of the tape located in the tape guide (the welding machine is not shown), and the line is put into operation.

 The device of this line was implemented at ChMZ OJSC in the manufacture of technological lines for the production of cored wire.

 The main advantages of the proposed line.

 1. The downtime and labor costs associated with replacing the roll of the original tape are reduced several times.

 2. Significantly reduced overall dimensions of the line, simplified its maintenance.

 3. The use of a guide tape and an additional caliber in the device for closing the lock increases the reliability of the lock.

Sources of information
1. Kablukovsky A.F. and other. Out-of-furnace treatment of 22 GY converter steel by flux-cored wire. Bulletin "Iron and Steel" - 1993, N 9-10.

 2. RU, patent 2110385, cl. B 23 K 35/40, B 22 F 3/00, B 22 F 7/04, 1998.

Claims (1)

 A line for the production of flux-cored wire in a metal sheath, containing a sequentially located tape unwinding device, a forming mill consisting of vertical and horizontal forming stands with a metering device for filling powder in a gutter formed from tape, a device for closing a lock, a reducing unit, and a wire riot winding machine characterized in that the tape unwinding device is made on-off in the form of a rotary platform with two identical nodes installed on it, each of which contains a three-jaw clamp, a braking mechanism, a stationary and removable cheeks, and the forming mill is equipped with a guide tape installed in front of the first horizontal forming stand, made in the form of a bracket with a movable frame having two upper and two lower rollers, the upper of which are installed with the possibility of spring pressing to the lower rollers having flanges, the distance between which is equal to the width of the original tape, while the horizontal forming stands of the forming mill are non-driven, the first of which It is provided with a gauge for generating flags lock, and a device for closing the lock position to its inclination gauge roller mounted for compression lock in an upright position after closing.

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