Scarfing machine for scarfing hot and cold workpieces made of steel, such as slabs, blocks and billets

Abstract

Scarfing machine (1) for scarfing hot and cold work pieces (2), such as slabs, blooms and billets made from steel in and downstream of continuous casting plants with a roller table (3) arranged in the direction of transport of the work piece, on which the work piece (2) to be scarfed can be moved back and forth. The scarfing machine (1) is set up in a gap (4) formed in the roller table (3) which has a U-shaped beam (7) with a scarfing unit (10) in the form of a rack of manifolds arranged crosswise to the roller table (3). The height of the burner beam (7) can be adjusted and it can be pivoted approximately 180° on a horizontal axis (8) around the top, bottom and cut sides of the work piece (2) by means of a swivelling drive (6) while the work piece is moved back and forth.

Claims

1. A scarfing machine (1) for scarfing hot and cold work pieces (2), such as slabs, blooms and billets made from steel in and downstream of continuous casting plants, with a roller table (3), having a gap (4) for placement of the scarfing machine (1) therewithin, arranged in the direction of transport of the workpiece (2), on which the workpiece (2) to be scarfed can be moved back and forth such that the workpiece (2), while being worked upon, spans the gap (4) in the roller table (3) so as to completely and simultaneously expose a top, a bottom and sides of that part of the workpiece (2) spanning the gap (4) to scarfing, characterised in that the scarfing machine (1) is set up in the gap (4) fotiiied in the roller table (3) and has a U-shaped burner beam (7) with a scarfing unit (10) in the form of a rack of manifolds arranged cross-wise to the roller table (3), wherein the burner beam (7) is adjustable to various heights within the scarfing machine (1) and is pivotable approximately 180° on a horizontal axis (8) around the top, bottom and cut sides of the workpiece (2) by means of a swiveling drive (6) while the workpiece is moved back and forth across the gap (4) in the roller table so as to access the entire surface of the workpiece (2) with burners.

2. The scarfing machine according to claim 1, characterised in that the burner beam (7) is arranged for height adjustment relative to the workpiece (2) by means of lifting guides (5) and runs in at least one frame guide (9).

3. The scarfing machine according to claim 1, characterised in that the scarfing unit (10), which is formed as a rack of manifolds with a number of distributor heads (11) with scarfing burner lips (12) arranged side-by-side, is arranged on the horizontal part of the burner beam (7).

4. The scarfing machine according to claim 3, characterised in that the scarfing burner lips (12) of the distributor heads (11) are arranged at an angle of approximately 30° from the horizontal in relation to the work piece (2).

5. The scarfing machine according to claim 1, characterised in that a machine portal (13) arranged crosswise to the roller table (3) has at least two side scarfing burners (14) with distributor heads (11) with scarfing burner lips (12) that are arranged at an offset in order to scarf the longitudinal sides of the work piece (2).

6. The scarfing machine according to claim 5, characterised in that the side scarfing burners (14) have drives (15) for horizontal movement.

Description

(1) The idea behind the invention is explained in further detail in the following description on the basis of a sample implementation, which is illustrated by the drawings. These are:

(2) FIG. 1 a front view of a scarfing machine for scarfing work pieces,

(3) FIG. 2 a lateral view of the scarfing machine according to FIG. 1 in an initial step,

(4) FIG. 3 a lateral view of the scarfing machine according to FIG. 1 in a second step and

(5) FIG. 4 a lateral view of the scarfing machine according to FIG. 1 in a third step.

(6) The scarfing machine 1 shown in FIG. 1 to FIG. 4 is designed for scarfing hot and cold work pieces 2, such as slabs, blooms and billets made from steel in and downstream of a continuous casting plant.

(7) The continuous casting plant (which is not described in further detail here) features a roller table 3—indicated by a dotted line in the drawings—on which the work piece 2 is carried out of the scarfing machine 1 and which is used to move the work piece back and forth while the scarfing machine 1 does its work. As can be seen in FIG. 2 to FIG. 4 in particular, the roller table 3 forms a gap 4 in which the scarfing machine 1 is stationed and which is crosswise to the roller table 3 and therefore crosswise to the transport direction of the work piece 2. The compact design of the scarfing machine 1 means that the gap 4 is small enough to allow the work piece 2 to move through it with ease without allowing the work piece 2 to topple over.

(8) The two sides of the roller table 3 each have a lifting guide 5 for the scarfing machine 1 with an associated swivelling drive 6. The lifting guide 5 and the swivelling drives 6 are connected to a U-shaped burner beam 7 which can be pivoted approximately 180° around a horizontal axis 8, namely from top to bottom and vice versa, as well as being height-adjustable. The burner beam 7 runs in a frame guide 9 while the height is being adjusted.

(9) The horizontal part of the burner beam 7 has a scarfing unit 10 in the form of a rack of manifolds that features a number of distributor heads 11 arranged side-by-side. Each distributor head 11 has a top and bottom scarfing burner lip 12, whereby the distributor head 11 and the scarfing burner lips 12 are supplied with the media required for scarfing purposes, such as heating gas, heating oxygen and scarfing oxygen, by means of a supply line that is not described in further detail here. The numerous scarfing burner lips 12 thus form an integrated scarfing slot.

(10) In addition, the scarfing machine 1 features a fixed machine portal 13, which also stretches crosswise over the roller table 3 and therefore across the work piece 2. There are two side scarfing burners 14 arranged at an offset on the machine portal 13 which can be moved horizontally along the machine portal 13 by means of drives 15. The side scarfing burners 14 also each have a number of distributor heads 11 with pairs of scarfing burner lips 12 similar to the distributor heads 11 on the burner beam 7.

(11) While the distributor heads 11 on the burner beam 7 are provided for scarfing the top, bottom and front cut sides of the work piece 2, the distributor heads 11 of the side scarfing burners 14 are for scarfing the longitudinal sides of work piece 2.

(12) Accordingly, the burner beam 7 can be turned by the swivelling drives 6 in order to scarf the top, front cut sides and bottom of the work piece 2.

(13) FIG. 2 shows the scarfing machine 1 in which the burner beam 7 is raised in the frame guide 9. In this position, the distributor heads 11 of the burner beam 7 are supplied with the media required for scarfing purposes and the top side of the work piece 2 is heated and thus prepared for scarfing. Similarly, the distributor heads 11 of the side scarfing burners 14 heat the longitudinal edges of the work piece 2.

(14) FIG. 3 shows the scarfing machine 1 in which the burner beam 7 is lowered in the frame guide 9. In this position, the distributor heads 11 of the burner beam 7 and the side scarfing burners 14 heat the top side and the two longitudinal edges of the work piece 2, whereby the work piece 2 is moved forwards or backwards through the scarfing machine 1 by means of pincher rollers arranged on the roller table 3 which are already familiar and are not shown in greater detail.

(15) FIG. 4 shows the scarfing machine 1 in which the burner beam 7 is again raised in the frame guide 9. At the same time, the burner beam 7 is turned by 180° from its upper position into its lower position. The bottom side of the work piece 2 is now scarfed in the same manner, as shown in relation to FIG. 3. This involves moving the work piece 2 backwards or forwards through the scarfing machine 1 by means of the pincher rollers arranged on the roller table 3.

(16) Similarly, the two front cut sides of work piece 2 are scarfed, as described in relation to FIG. 3 and FIG. 4. For example, burner beam 7 is simply turned by 90°. This process is not shown separately in the drawings.

(17) However, it is only necessary to scarf the two longitudinal edges of work piece 2 just once.

REFERENCE NUMBERS

(18) 1 Scarfing machine 2 Work piece 3 Roller table 4 Gap 5 Lifting guide 6 Swivelling drive 7 Burner beam 8 Horizontal axis 9 Frame guide 10 Scarfing unit 11 Distributor heads 12 Scarfing burner lips 13 Machine portal 14 Side scarfing burner 15 Drive

REFERENCES CITED

(19) Patent References Cited

(20) WO 2011/160692 A1