Gradual cambered chamfered mold with enhanced water cooling structure and design method

A chamfering crystallizer and crystallizer technology, which are applied in the field of billet continuous casting production, can solve the problems such as the inability to fully consider the thermal shrinkage of the corner of the crystallizer, the uneven distribution of the mold slag film and the air gap, and the uneven growth of the billet shell. , to prevent the accumulation of mold slag, improve the heat transfer at the corners, and inhibit the generation of corner defects

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

This design method cannot fully take into account the heat shrinkage at the corners of the mold, resulting in uneven distribution of mold slag film and air gaps, resulting in uneven growth of the billet shell and corner crack defects

Method used

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  • Gradual cambered chamfered mold with enhanced water cooling structure and design method
  • Gradual cambered chamfered mold with enhanced water cooling structure and design method
  • Gradual cambered chamfered mold with enhanced water cooling structure and design method

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Experimental program
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Effect test

Embodiment 1

[0044] The embodiment of the present invention is applied to the crystallizer of a 280mm×325mm bloom continuous casting machine in a certain steel factory. The mold length is 800mm. It is a tubular crystallizer and mainly produces high-carbon alloy steel such as bearing steel and cord steel.

[0045] The design method of present embodiment crystallizer is:

[0046] (1) Taking bearing steel GCr15 as the main production steel object, the measurement results of thermal contraction coefficient of bearing steel GCr15 when cooling from 1300°C to 500°C at different cooling rates are as follows: Figure 10 shown;

[0047] (2) According to the copper plate structure of the crystallizer, the size of the cast slab and the thermal contraction coefficient of the specific steel grade obtained from the measurement, a two-dimensional transient thermal-mechanical coupling calculation model is established with the 1 / 4 billet shell-mold cross-section system as the calculation object, The specif...

Embodiment 2

[0137] The embodiment of the present invention is applied to the crystallizer of a 360mm×450mm bloom continuous casting machine in a steel factory. The crystallizer length is 850mm. It is a four-sided combined crystallizer and mainly produces medium carbon alloy steels such as 45# and 40Cr.

[0138] According to the method steps in the embodiment 1 related to the crystallizer, the progressive arc chamfering crystallizer with enhanced water-cooling structure finally obtained, such as Figure 1 to Figure 6 and Figure 9 As shown, with four such as figure 1 The symmetrically distributed upper chamfer 2 and four lower chamfers 3 shown are along the height direction of the crystallizer inner wall 1, from the upper chamfer 2 to the lower chamfer 3, and the chamfer angles are according to Figure 10 The heat shrinkage of the billet corner shown in the figure gradually increases, and the chamfered surface 4 formed between the upper chamfer 2 and the lower chamfer 3 is a gradual arc s...

Embodiment 3

[0145] The embodiment of the present invention is applied to the crystallizer of a 180mm×180mm bloom continuous casting machine in a certain steel factory. The crystallizer length is 800mm. It is a copper tube type crystallizer and mainly produces high-carbon alloy steel such as 72A.

[0146] According to the method steps in the embodiment 1 related to the crystallizer, the progressive arc chamfering crystallizer with enhanced water-cooling structure finally obtained, such as Figure 1 to Figure 8 As shown, with four such as figure 1 The symmetrically distributed upper chamfer 2 and four lower chamfers 3 shown are along the height direction of the crystallizer inner wall 1, from the upper chamfer 2 to the lower chamfer 3, and the chamfer angles are according to Figure 10 The heat shrinkage of the billet corner shown in the figure gradually increases, and the chamfered surface 4 formed between the upper chamfer 2 and the lower chamfer 3 is a gradual arc surface, and the transi...

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Abstract

The invention belongs to the field of billet continuous casting production, and particularly relates to a gradual cambered chamfered mold with an enhanced water cooling structure and a design method. The mold is provided with four upper opening chamfers and four lower opening chamfers, wherein the chamfer angle is gradually increased according to the thermal contraction rule at the corner of a casting blank from the upper opening chamfers to the lower opening chamfers along the height direction of the inner wall of the mold; the chamfer surfaces formed between the upper opening chamfers and the lower opening chamfers are gradual cambered surfaces; the transition arc length at the boundary of the gradual cambered surfaces increases according to the air gap growth rule; the beveled edges of the upper opening chamfers on the chamber surfaces are straight or cambered; the beveled edges of the lower opening chamfers on the chamber surfaces are also straight or cambered. According to the mold, the air gap is effectively suppressed through a specific cambered chamfer structure, the heat transfer of the corner of the billet is improved, the shell growth is homogenized, the cooling of the corner of the mold is obviously improved by enhancing the water cooling structure of the chamfer region, the grains of the chamfer contact surface are thinned, and the occurrence of the corner defect is surpassed.

Description

technical field [0001] The invention belongs to the field of billet continuous casting production, and in particular relates to a progressive arc chamfering crystallizer with enhanced water cooling structure and a design method. Background technique [0002] In the 10 years since entering the 21st century, with the technological progress and rapid development of my country's transportation, petrochemical, heavy machinery and marine engineering industries, higher technical requirements have been put forward for the quality, performance, specifications and dimensions of steel products, thus Vigorously promote the development of continuous casting process equipment technology. Continuous casting can replace traditional die casting to produce cast slabs that require strict rolling compression ratios. The metal yield can be increased by more than 10%, energy consumption per ton of steel can be reduced by more than 25%, and it has uniform and stable composition and good surface qua...

Claims

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Application Information

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IPC IPC(8): B22D11/057B22D11/055
CPCB22D11/055B22D11/057
Inventor 祭程朱苗勇蔡兆镇
Owner NORTHEASTERN UNIV
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