CN200998764Y - Continuous Casting Mold - Google Patents

Abstract

The utility model discloses a continuous casting crystallizer, which comprises two opposite long side plates and two short side plates located between the long side plates, the inner side walls of the two short side plates are arc-shaped, crystallized The four corners of the device are rounded. By setting the inner side wall of the short side plate into an arc shape and the four corners into rounded corners, the section of the cast slab can be waist-shaped and the four corners rounded. In this way, the cast slab will not have corner flanging during the hot rolling process, effectively avoiding the excessive cooling of the corner part, and the end face of the long side slab can be cooled evenly and slowly, so that the edge is rolled at 1 to 2 cm. The longitudinal striped black line and warped skin defects produced later are eliminated.

Description

Continuous Casting Mold

technical field

The utility model relates to a machine in the slab continuous casting technology, in particular to a crystallizer.

Background technique

At present, the crystallizers of continuous casting units at home and abroad generally adopt the structural form of long-side copper plates to measure and short-side copper plates to move and measure. The structural diagram is shown in Figure 1. The existing continuous casting mold includes two opposing long-side copper plates. 3, 4, the inner wall is flat, and the two long-side copper plates are fixed parts; it also includes two opposite short-side copper plates 1, 2, the inner wall is also flat, and the short-side copper plates 1, 2 are arranged on the two long-side copper plates Between 3 and 4, they are respectively arranged on the two sides. The short-side copper plates 1 and 2 are moving parts, and the outer sides are respectively connected with hydraulic devices 5 and 6 (or the motor drives the lead screw). The short-side copper plates 1 and 2 are driven by the hydraulic devices 5 and 6 on both sides or the motor drives the lead screw to adjust the width and size, which can meet the requirements of producing blanks of different sizes. Both the long-side copper plate and the short-side copper plate of the crystallizer are provided with cooling water inlet and outlet interfaces, wherein: the long-side water inlets 3-1, 4-1 are located on the back of the long-side copper plate, and the long-side water outlets 3-2, 4-2 It is also located on the back of the long-side copper plate; the short-side water inlets 1-1 and 2-1 are located on the back of the short-side copper plate, and the short-side water outlets 1-2 and 2-2 are also located on the back of the short-side copper plate. The long side and the short side of the billet can be cooled simultaneously when the molten steel passes through the crystallizer through these cooling water inlet and outlet ports.

In this way, the crystallizer constitutes a cuboid frame structure with upper and lower ends open. The steel pouring port is poured from the upper end, and the continuous casting slab formed by cooling flows out from the lower end. Since the long-side copper plates 3 and 4 and the short-side copper plates 1 and 2 are all plane shapes, the produced slab is a cuboid, and the four corners of the cross-section are sharp corners. Under the cooling of the water-cooled crystallizer, the edges and corners of the slab The cooling rate is faster.

As shown in Figure 3, the steel billet cast by the existing crystallizer is subjected to force in the direction of the long side during the rolling process, and the edges and corners of the steel billet are cooled first under the action of the rolling liquid, and appear Hardened and turned outwards, the edge forms the shape shown in Figure 4, so that some slag is rolled into the edge of the strip, and after rolling at 1 to 2 cm from the edge, a longitudinal strip-shaped black edge defect is produced.

Chinese patent 200420010720.8 is provided with an arc-shaped copper plate, but its arc-shaped structure from top to bottom is only to change the flow direction of the slab, but fails to eliminate the black edge defect of the slab after hot rolling.

Utility model content

The purpose of the utility model is to improve the quality of the continuous casting slab by changing the shape of the inner wall of the crystallizer of the continuous casting unit, and eliminate the black edge defect of the continuous casting slab during hot rolling.

The technical scheme of the utility model to achieve the above purpose is to provide a continuous casting crystallizer, comprising two opposite long side plates and two short side plates between the long side plates, characterized in that: the two The inner wall of the short side plate is arc-shaped.

The inner cavity surface of the short side plate described in the utility model is a smooth curved surface, which is located between two straight long side plates, and the length of the short side plate can be selected from various specifications according to the thickness of the cast steel slab. The long side plate of the cast billet is a parallel end face, and the short side plate is an outwardly protruding arc-shaped end face. The cross section of the billet is in the shape of a keyway, so that the cast slab will not appear angular flanging during hot rolling , can effectively avoid the excessive cooling of the corner part, and the end face of the long side plate can be cooled evenly and slowly, so that the vertical strip black line warping defect produced after rolling at the edge of 1 to 2 cm can be eliminated.

Preferably, the four corners of the crystallizer are rounded, so that the four corners of the billet obtained after casting are rounded, and the excessive cooling of the edge of the billet can be better avoided during the rolling process.

Compared with the prior art, the utility model has the following advantages and positive effects due to the adoption of the above technical scheme:

The steel slab cast by the crystallizer of the utility model has a uniform edge cooling effect in the rolling process, which reduces or eliminates the black line warping defect after hot rolling.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the existing continuous casting crystallizer.

Fig. 2 is a structural schematic diagram of the continuous casting crystallizer of the present invention.

Fig. 3 is a schematic diagram of the cross-sectional stress of a billet cast in an existing crystallizer during rolling.

Fig. 4 is a schematic diagram of the deformation of the edge of the billet cast in the existing crystallizer during rolling.

Fig. 5 is a schematic diagram of the cross-section and stress of the steel billet cast by the crystallizer of the present invention during rolling.

Fig. 6 is a schematic diagram of the edge of the billet cast by the crystallizer of the present invention during the rolling process.

Detailed ways

In a specific embodiment of the present utility model, as shown in Figure 2, the utility model is based on the existing continuous casting crystallizer, and the inner walls of the short-side copper plates 1 and 2 are arranged in a circular arc shape, and other settings are different. change, that is, it also includes: two long-side copper plates 3, 4, the inner wall is a plane, and the short-side copper plates 1, 2 are arranged between the two long-side copper plates 3, 4, and are respectively arranged on two sides; the short-side copper plates 1, 2 The outer sides are respectively connected with hydraulic devices 5 and 6 (or the motor drives the leading screw). The short-side copper plates 1 and 2 are driven by hydraulic devices 5 and 6 or motors to drive the lead screw to adjust the width. It also includes the water inlet and outlet interfaces of the cooling water. The water inlets 3-1 and 4-1 are located on the back of the long-side copper plate, the water outlets 3-2 and 4-2 are located on the back of the long-side copper plate, and the water inlets 1-1 and 2-1 are located on the short side. On the back side of the side copper plate, the water outlets 1-2 and 2-2 are located on the back side of the short side copper plate. Utilize the continuous casting crystallizer of the utility model to carry out casting, the cross-section of the slab after casting is waist-shaped, and the four corners of the crystallizer can be further designed as rounded corners (not shown in the figure), so that the cast slab does not Has edges and corners. The slab cast in this way will not have corner flanging during the hot rolling process, which effectively avoids the excessive cooling of the corner part of the slab, and the end face of the long side slab can be cooled evenly and slowly, so that the edge 1 to 2 cm Eliminate longitudinal striped black line warping defects after rolling.

With the billet obtained by the crystallizer of the utility model shown in Fig. 2, the stress situation of the billet in the rolling process is shown in Fig. 5 . It can be seen from Figure 5 that since the two ends of the short side of the steel billet are arc-shaped, the steel billet is subjected to two forces perpendicular to the short side and outwards in addition to the force applied to the long side in one direction. During rolling, the two sides protrude outward, which effectively prevents the slag inclusion caused by the edge flanging and eliminates the defects of the strip edge. The edge condition during rolling is shown in Figure 6. In this way, the longitudinal strip-shaped black line warping defect produced after the steel billet is rolled is avoided.

Claims (2)

1. a continuous cast mold comprises two opposed long side plates and two blocks of minor face plates between long side plate, it is characterized in that: described two minor face plate madial walls are circular arc.

2. continuous cast mold as claimed in claim 1 is characterized in that: four angles of crystallizer are fillet.

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