Gradient curvature raised roller of tension leveler for cogged ingot continuous casting and use method

A tension leveler and bloom technology, which is applied in the field of bloom continuous casting production, can solve problems such as stress concentration and cracks in the corners of the billet, and achieve the effects of stable feeding, increasing deformation, and avoiding thermal stress concentration.

Active Publication Date: 2015-03-11
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this design structure will inevitably lead to stress concentration at the position of the double 1 / 4 circular transition arc, resulting in cracks at the corners of the slab

Method used

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  • Gradient curvature raised roller of tension leveler for cogged ingot continuous casting and use method
  • Gradient curvature raised roller of tension leveler for cogged ingot continuous casting and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The gradual curvature convex roll of the tension leveler of this embodiment is applied to a 280mm×325mm bloom continuous caster in a steel plant. The 7 tension leveler is used for light reduction. The specific steel types produced are cord steel, bearing steel, etc. Mainly high-carbon alloy steel.

[0026] The structure of the gradual curvature convex roll of the stretch-leveling machine for bloom continuous casting of this embodiment is as follows figure 2 As shown, it is composed of a roller shaft and a roller body, wherein the roller body is composed of an edge zone 1, a gradient curvature zone 2 and a flat roller zone 3. The edge zone 1 is between the edge of the roller body and the arc starting position Area, the gradual curvature area 2 is the area from the starting position to the end arc position, the flat roller area 3 is the area formed between two symmetrically distributed end arc positions on the roller body; The curvature transition zone described is compose...

Embodiment 2

[0035] The gradual curvature convex roll of the tension leveler of this embodiment is applied to a 280mm×325mm bloom continuous caster in a steel plant. The 7 tension leveler is used for light reduction. The specific steel types produced are cord steel, bearing steel, etc. Mainly high-carbon alloy steel.

[0036] The structure of the gradual curvature convex roll of the stretch-leveling machine for bloom continuous casting of this embodiment is as follows figure 2 As shown, it is composed of a roller shaft and a roller body, wherein the roller body is composed of an edge zone 1, a gradient curvature zone 2 and a flat roller zone 3. The edge zone 1 is between the edge of the roller body and the arc starting position Area, the gradual curvature area 2 is the area from the starting position to the end arc position, the flat roller area 3 is the area formed between two symmetrically distributed end arc positions on the roller body; The curvature transition zone described is compose...

Embodiment 3

[0045] The gradual curvature convex roll of the tensile straightening machine of this embodiment is applied to a 380mm×490mm bloom continuous caster in a steel plant. There are 12 tensile straightening machines, of which 10 can be pressed down straightening machines to produce bearing steel and cold heading. Steel and other medium and high-carbon alloy steels are mainly used.

[0046] The structure of the gradual curvature convex roll of the stretch-leveling machine for bloom continuous casting of this embodiment is as follows figure 2 As shown, it is composed of a roller shaft and a roller body, wherein the roller body is composed of an edge zone 1, a gradient curvature zone 2 and a flat roller zone 3. The edge zone 1 is between the edge of the roller body and the arc starting position Area, the gradual curvature area 2 is the area from the starting position to the end arc position, the flat roller area 3 is the area formed between two symmetrically distributed end arc position...

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Abstract

The invention belongs to the field of cogged ingot continuous casting production and especially relates to a gradient curvature raised roller of a tension leveler for cogged ingot continuous casting and a use method. The gradient curvature raised roller of the tension leveler provided by the invention is composed of a roller shaft and a roller body, wherein the roller body is composed of an edge area, a gradient curvature area and a flat roller area; the gradient curvature area is composed of an arcing area and an arc-varying area; the arc curvature between an arcing point and an arc-varying point of the arcing area is gradually increased; the arc curvature between the arc-varying point and an arc-ending point of the arc-varying area is gradually reduced; the flat roller area is raised relative to the edge area. At least four tension levelers with the gradient curvature raised rollers are used for pressing a cogged ingot continuous casting slab; during the pressing process, the average temperature of the surface of the continuous casting slab is controlled at above or equal to 800 DEG C and the temperature difference of surface center and corner is at below or equal to 150 DEG C; lastly, the continuous casting slab with improved central segregation and loosening is acquired. The smooth transition between the flat roller area and the raised roller area is realized by the gradient curvature raised roller provided by the invention and the crack defect caused by the stress concentration of the transition area is effectively avoided.

Description

Technical field [0001] The invention belongs to the field of bloom continuous casting production, and in particular relates to a gradual curvature convex roll of a stretching straightening machine used for bloom continuous casting and a use method. Background technique [0002] Dynamic soft reduction of continuous casting slab is an effective process technology to improve the center segregation and porosity of continuous casting slab. Its implementation principle is: applying pressure near the end of solidification of continuous casting slab produces a certain reduction, which prevents the enrichment of segregated elements. The molten steel flows to eliminate the center segregation and at the same time compensate the solidification shrinkage of the continuous casting billet to eliminate the center looseness. The applied pressure includes thermal stress and mechanical stress. The reduction is an important parameter that determines how much reduction is carried out. The reduction i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/12
Inventor 祭程朱苗勇
Owner NORTHEASTERN UNIV
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