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A progressive arc chamfering crystallizer with enhanced water cooling structure and its design method

A technology of chamfering mold and design method, which is applied in the field of billet continuous casting production, and can solve problems such as insufficient consideration of heat shrinkage at mold corners, uneven distribution of mold slag film and air gap, and uneven growth of billet shells. , to prevent mold slag from accumulating, improve heat transfer at corners, and suppress corner defects

Active Publication Date: 2017-02-22
NORTHEASTERN UNIV LIAONING
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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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  • A progressive arc chamfering crystallizer with enhanced water cooling structure and its design method
  • A progressive arc chamfering crystallizer with enhanced water cooling structure and its design method
  • A progressive arc chamfering crystallizer with enhanced water cooling structure and its design method

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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 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 transition arc...

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Abstract

The invention belongs to the field of billet continuous casting production, and specifically relates to a progressive arc-shaped chamfered crystallizer with an enhanced water-cooling structure and a design method. The mold of the present invention has four upper opening chamfers and four lower opening chamfers. Along the height direction of the inner wall of the crystallizer, from the upper opening chamfer to the lower opening chamfer, the chamfering angles follow the heat shrinkage rules of the corners of the casting slab. Gradually increases, the chamfer surface formed between the upper chamfer and the lower chamfer is a gradient arc surface. The transition arc length of the gradient arc surface boundary increases according to the air gap growth law. The upper chamfer is located on the chamfer surface. The hypotenuse on the top is a straight line or an arc, and the hypotenuse on the chamfer surface of the lower chamfer is also a straight line or an arc. The mold of the present invention effectively suppresses air gaps through a unique arc-shaped chamfer structure, improves heat transfer at the corners of the billet, and uniformly grows the billet shell. By enhancing the water-cooling structure in the chamfer area, the cooling speed at the corners of the mold is significantly increased, and the mold becomes finer. The chamfered contact surface grains are reduced to suppress the occurrence of corner defects.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/057B22D11/055
CPCB22D11/055B22D11/057
Inventor 祭程朱苗勇蔡兆镇
Owner NORTHEASTERN UNIV LIAONING
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