Forging and pressing device for eliminating cold shrinkage defect of center of continuous casting steel billet

Abstract

The utility model relates to a forging and pressing device for eliminating the cold shrinkage defect of the center of a continuous casting billet. In the continuous casting production process of extra-large or large-specification steel billets, the internal waste heat temperature of the steel billets always exceeds the surface temperature, the steel billets are pulled to be gradually cooled, and defects are formed in the core parts of the steel billets due to different internal and external cooling speeds. According to the design, the forging and pressing device is arranged on the periphery of the continuous casting billet, the multiple sets of extrusion heads are arranged, two sets of tracking forging and pressing heads synchronously moving with the continuous casting billet are applied to the portion, about to crack, of the core of the continuous casting billet due to cold shrinkage, the continuous casting billet is subjected to multi-directional forging and pressing, and the cold shrinkage defect of the large-specification continuous casting billet is overcome. And therefore, the production specification of the continuous casting steel billet is maximized. The utility model has the advantages of novel design, reasonable structure, energy conservation and the like.

Description

Technical Field

[0001] The utility model relates to a forging device, in particular to a forging device for eliminating cold shrinkage defects in the solidification process of a continuous casting steel billet, and belongs to the technical field of mechanical design and manufacturing. Background Art

[0002] Steel casting is the basic process of steel production, usually using two methods: die casting and continuous casting. Die casting is to pour molten steel into a mold to cool and solidify into a billet. One mold can only cast one billet at a time, and the production cycle is long. It is only suitable for small batches and special billet production. The advantages are simple equipment and small investment. The disadvantages are low yield rate, serious segregation, high unit cost and low efficiency. Continuous casting is to continuously inject molten steel into a crystallizer and solidify it into a continuous casting billet through a water-cooled crystallizer. It is suitable for large-scale and standardized production. The advantages are high efficiency and high degree of automation. The disadvantage is that it is easy to have central defects such as looseness and shrinkage. These defects become more serious as the diameter of the casting increases. With the continuous increase in the demand and specifications of billets, continuous casting becomes particularly important. Therefore, the traditional continuous casting process should be improved to adapt to the market demand for large-scale, high-quality cast steel billets. Summary of the invention

[0003] In order to solve the problems existing in the background technology, the utility model proposes a forging device for eliminating the central shrinkage defect of a continuously cast steel billet. A forging device is arranged on the periphery of the formed continuously cast steel billet to perform multi-directional forging on the steel billet during the continuous casting process to eliminate the shrinkage defect of a large-sized continuously cast steel billet.

[0004] In order to achieve the above-mentioned purpose, the utility model designs the following technical scheme: a forging device for eliminating the central shrinkage defect of a continuous casting steel billet, comprising a continuous casting machine, wherein the continuous casting machine comprises a vertical continuous casting machine and a horizontal continuous casting machine, wherein the continuous casting machine is vertical, comprises a crystallizer and a straightening device, wherein the molten steel is cooled in the crystallizer to form a high-temperature continuous casting steel billet, and the straightening device pulls out the high-temperature continuous casting steel billet; wherein the continuous casting machine is horizontal, comprises a crystallizer and a guiding device, wherein the molten steel is cooled in the crystallizer to form a high-temperature continuous casting steel billet, and the guiding device pulls out the high-temperature continuous casting steel billet, and wherein:

[0005] A forging device is arranged on the periphery of the high temperature continuous casting steel billet;

[0006] The forging device comprises a foundation, a fixed beam, a frame, a forging assembly and a moving member;

[0007] The fixed beam is arranged on a foundation;

[0008] The frame is provided with a sliding seat, which forms a moving pair with the fixed beam;

[0009] The forging assembly is fixed on the frame, and each forging assembly includes a hydraulic cylinder and a forging head, and the forging head is fixedly connected to the piston rod of the hydraulic cylinder to radially forge the high-temperature continuous casting steel billet;

[0010] The moving component includes a tracking wedge pushing component and a reset component; the tracking wedge pushing component includes a fixed inclined surface body arranged on a fixed beam, the fixed inclined surface body wedge pushes the forging head, drives the frame to track the high-temperature continuous casting billet and run synchronously, so that the forging head tracks and forges the high-temperature continuous casting billet; the reset component includes a reset spring, one end of which is fixed on the fixed beam, and the other end squeezes the frame, and the forging head returns, and the reset spring pushes the frame to reset.

[0011] Preferably, every two symmetrically arranged forging assemblies constitute a ram group, and two ram groups are arranged; the two forging rams in each ram group forge the high-temperature continuous casting steel billet radially relative to each other, and the two ram groups forge the high-temperature continuous casting steel billet in turn.

[0012] Preferably, the axes of each group of forging heads coincide with each other, the axes of the two groups of forging heads are in the same plane, and the axes of adjacent forging heads form an angle of 90° with each other.

[0013] Furthermore, the pressing amount of the forging head is 8%-12% of the maximum size of the steel billet cross section, and the pressing length each time is ≥50% of the maximum size of the steel billet cross section.

[0014] Preferably, the lower side of the forging head is arranged as an inclined surface, which fits with the inclined surface on the fixed inclined surface body, and a inclined surface sliding pair is formed therebetween.

[0015] Furthermore, when the continuous casting machine is vertical, the sliding seat and the fixed beam form a vertical moving pair.

[0016] Furthermore, when the continuous casting machine is horizontal, the sliding seat and the fixed beam form a transverse moving pair.

[0017] Preferably, the forging device is arranged in a region where the surface temperature of the steel billet is 850--900°C and the core temperature is 1150--1250°C.

[0018] The utility model sets an extrusion device on the periphery of the high-temperature continuous casting steel billet, aiming to solve the problem of cold shrinkage defects in the core of the large-sized continuous casting steel billet during the cooling process. In the continuous casting production process of extra-large or large-sized steel billets, the residual heat temperature inside the steel billet always exceeds the surface temperature, and the steel billet is gradually cooled by traction. Two sets of tracking forging heads that move synchronously with the continuous casting steel billet are used at the part where the core of the steel billet is about to crack due to cold shrinkage, and the steel billet casting is squeezed in turn, so that the central defects of the high-temperature continuous casting steel billet are forged in time, thereby realizing the maximization of the production specifications of the continuous casting steel billet.

[0019] The utility model has the advantages of novel design, reasonable structure and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 , 2 , 3, and 4 are schematic diagrams of the implementation of the vertical continuous casting machine.

[0021] Attached Figure 1 This is the main structure diagram.

[0022] Attached Figure 2 For attachment Figure 1 AA section structure diagram in the initial state,

[0023] Attached Figure 3 This is the AA section structure diagram of the hydraulic cylinders c and d in working state.

[0024] Attached Figure 4 It is a schematic diagram of the AA cross-section structure of hydraulic cylinders a and b in working state.

[0025] Attached Figure 5 , 6 , 7 and 8 are schematic diagrams of the implementation of the horizontal continuous casting machine.

[0026] Attached Figure 5 This is the main structure diagram.

[0027] Attached Figure 6 For attachment Figure 5 AA section structure diagram in the initial state,

[0028] Attached Figure 7 This is the AA section structure diagram of the hydraulic cylinders a and b in working state.

[0029] Attached Figure 8 It is a schematic diagram of the AA cross-section structure of hydraulic cylinders c and d in working state.

[0030] In the attached drawings, 1 is a crystallizer, 2 is a condensation guide, 3 is a traction roller, 4 is a fixed inclined plane, 5 is a frame, 6 is a return spring, 7 is a high-temperature continuous casting billet, 8 is a fixed beam, 9 is a sliding seat, a, b, c, d are hydraulic cylinders, and e, f, g, h are extrusion heads. DETAILED DESCRIPTION

[0031] As attached Figure 1 , 2 , 3, and 4 are schematic diagrams of the structure and working status of the vertical continuous casting machine. Figure 1As shown, high-temperature molten steel is injected into the crystallizer 1, enters the condensation guide 2 after water cooling, and slowly extends downward under the action of the traction roller 3 and the gravity of the molten steel. The frame 5 is arranged on the periphery of the high-temperature continuous casting billet 7, and a vertical sliding moving pair is formed between the sliding seat 9 and the fixed beam 8. The hydraulic cylinders a, b, c, d are fixed on the frame 5, and the extrusion heads e, f, g, h are correspondingly arranged on the single output rods of the hydraulic cylinders a, d, b, c.

[0032] As attached Figure 2 As shown, the extrusion heads e, f, g, and h are separated from the high-temperature continuous casting billet 7.

[0033] As attached Figure 3 As shown, hydraulic cylinders d and c respectively drive extrusion heads f and h to extrude the high-temperature continuous casting billet 7. At the same time, the fixed inclined plane 4 wedges the extrusion heads f and h to move vertically downward synchronously with the high-temperature continuous casting billet 7. After extrusion to the set size, hydraulic cylinders d and c respectively drive the extrusion heads f and h to return, and the reset spring 6 pushes the frame 5 to reset through the extrusion heads f and h.

[0034] As attached Figure 4 As shown, hydraulic cylinders a and b respectively drive extrusion heads e and g to extrude the high-temperature continuous casting billet 7. At the same time, the fixed inclined plane 4 wedges the extrusion heads e and g to move vertically downward synchronously with the high-temperature continuous casting billet 7. After extrusion to the set size, hydraulic cylinders a and b respectively drive the extrusion heads e and g to return, and the reset spring 6 pushes the frame 5 to reset through the extrusion heads e and g.

[0035] go through Figure 3 and 4 The high-temperature continuous casting billet 7 is forged in multiple directions. Under the alternating extrusion of the extrusion heads e, f, g, and h, the central defect in the condensation process is eliminated.

[0036] As attached Figure 5 , 6 , 7, and 8 show the structure and working status of the horizontal continuous casting machine. Figure 5 As shown, high-temperature molten steel is injected into the crystallizer 1, enters the condensation guide 2 after water cooling, and slowly extends forward under the action of the traction roller 3 and the gravity of the molten steel. The frame 5 is arranged on the periphery of the high-temperature continuous casting billet 7, and a lateral sliding moving pair is formed between the sliding seat 9 and the fixed beam 8. The hydraulic cylinders a, b, c, d are fixed on the frame 5, and the extrusion heads e, f, g, h are correspondingly arranged on the single output rods of the hydraulic cylinders a, d, b, c.

[0037] As attached Figure 6 As shown, the extrusion heads e, f, g, and h are separated from the high-temperature continuous casting billet 7.

[0038] As attached Figure 7As shown, hydraulic cylinders a and b respectively drive extrusion heads e and g to extrude high-temperature continuous casting billets 7. Hydraulic cylinders a and b respectively drive extrusion heads e and g to extrude high-temperature continuous casting billets 7. At the same time, the fixed inclined plane 4 wedges the extrusion heads e and g to move vertically to the right synchronously with the high-temperature continuous casting billet 7. After extrusion to the set size, hydraulic cylinders a and b respectively drive the extrusion heads e and g to return, and the reset spring 6 pushes the frame 5 to reset through the extrusion heads e and g.

[0039] As attached Figure 8 As shown, hydraulic cylinders d and c respectively drive extrusion heads f and h to extrude the high-temperature continuous casting billet 7. At the same time, the fixed inclined plane 4 wedges the extrusion heads f and h to move vertically to the right synchronously with the high-temperature continuous casting billet 7. After extrusion to the set size, hydraulic cylinders d and c respectively drive the extrusion heads f and h to return, and the reset spring 6 pushes the frame 5 to reset through the extrusion heads f and h.

[0040] go through Figure 7 and 8 The high-temperature continuous casting billet 7 is forged in multiple directions. Under the alternating extrusion of the extrusion heads e, f, g, and h, the central defect in the condensation process is eliminated.

Claims

1. A forging device for eliminating the central shrinkage defect of a continuously cast steel billet, comprising a continuous casting machine, wherein the continuous casting machine comprises a vertical continuous casting machine and a horizontal continuous casting machine, wherein the continuous casting machine, when being vertical, comprises a crystallizer and a straightening device, wherein molten steel is cooled in the crystallizer to form a high-temperature continuously cast steel billet, and the straightening device pulls out the high-temperature continuously cast steel billet; wherein the continuous casting machine, when being horizontal, comprises a crystallizer and a guiding device, wherein molten steel is cooled in the crystallizer to form a high-temperature continuously cast steel billet, and the guiding device pulls out the high-temperature continuously cast steel billet, and wherein: A forging device is arranged on the periphery of the high temperature continuous casting steel billet; The forging device comprises a foundation, a fixed beam, a frame, a forging assembly and a moving member; The fixed beam is arranged on a foundation; The frame is provided with a sliding seat, which forms a moving pair with the fixed beam; The forging assembly is fixed on the frame, and each forging assembly includes a hydraulic cylinder and a forging head, and the forging head is fixedly connected to the piston rod of the hydraulic cylinder to radially forge the high-temperature continuous casting steel billet; The moving component includes a tracking wedge pushing component and a reset component; the tracking wedge pushing component includes a fixed inclined surface body arranged on a fixed beam, the fixed inclined surface body wedge pushes the forging head, drives the frame to track the high-temperature continuous casting billet and run synchronously, so that the forging head tracks and forges the high-temperature continuous casting billet; the reset component includes a reset spring, one end of which is fixed on the fixed beam, and the other end squeezes the frame, and the forging head returns, and the reset spring pushes the frame to reset.

2. A forging device for eliminating the central shrinkage defect of a continuous casting steel billet according to claim 1, characterized in that: Every two symmetrically arranged forging assemblies constitute a ram group, and two ram groups are arranged; the two forging rams in each ram group forge the high-temperature continuous casting steel billet radially relative to each other, and the two ram groups forge the high-temperature continuous casting steel billet in turn.

3. A forging device for eliminating the central shrinkage defect of a continuous casting steel billet according to claim 1 or 2, characterized in that: The axes of each group of forging heads coincide with each other, the axes of the two groups of forging heads are on the same plane, and the axes of adjacent forging heads form an angle of 90° with each other.

4. A forging device for eliminating the central shrinkage defect of a continuous casting steel billet according to claim 1 or 2, characterized in that: The pressing amount of the forging head is 8%-12% of the maximum size of the steel billet cross section, and the pressing length each time is ≥50% of the maximum size of the steel billet cross section.

5. A forging device for eliminating the central shrinkage defect of a continuous casting steel billet according to claim 1, characterized in that: The lower side of the forging head is arranged as an inclined surface, which fits with the inclined surface on the fixed inclined surface body, and a inclined surface sliding pair is formed therebetween.

6. A forging device for eliminating the central shrinkage defect of a continuous casting steel billet according to claim 1, characterized in that: When the continuous casting machine is vertical, the sliding seat and the fixed beam form a vertical moving pair.

7. A forging device for eliminating the central shrinkage defect of a continuous casting steel billet according to claim 1, characterized in that: When the continuous casting machine is horizontal, the sliding seat and the fixed beam form a transverse moving pair.

8. A forging device for eliminating the central shrinkage defect of a continuous casting steel billet according to claim 1, characterized in that: The forging device is arranged in a region where the surface temperature of the steel billet is 850--900°C and the core temperature is 1150--1250°C.

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