WO2016004682A1 - 连铸坯凝固末端大压下的连铸机扇形段及其大压下方法 - Google Patents

连铸坯凝固末端大压下的连铸机扇形段及其大压下方法 Download PDF

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WO2016004682A1
WO2016004682A1 PCT/CN2014/087369 CN2014087369W WO2016004682A1 WO 2016004682 A1 WO2016004682 A1 WO 2016004682A1 CN 2014087369 W CN2014087369 W CN 2014087369W WO 2016004682 A1 WO2016004682 A1 WO 2016004682A1
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Prior art keywords
continuous casting
driven roller
driving roller
pressing
roller
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PCT/CN2014/087369
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English (en)
French (fr)
Inventor
康永林
王新华
朱国明
麻晗
马建超
曲锦波
宇航
张志军
姜敏
许志刚
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北京科技大学
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Application filed by 北京科技大学 filed Critical 北京科技大学
Priority to KR1020177002175A priority Critical patent/KR20170021872A/ko
Priority to EP14897138.5A priority patent/EP3167974B8/en
Priority to JP2017501264A priority patent/JP6541043B2/ja
Publication of WO2016004682A1 publication Critical patent/WO2016004682A1/zh
Priority to US15/401,325 priority patent/US20170113266A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1284—Horizontal removing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use

Definitions

  • the invention relates to the technical field of slab casting, in particular to a continuous casting machine segment of a continuous casting billet having a large solidification end and a large pressing method thereof.
  • the large-pressing technology of the solidification end of continuous casting slab is to set the pressing roller on the solidification end of the continuous casting slab in the continuous casting production line.
  • the solid phase ratio of the casting blank reaches 80% or more, the casting blank is subjected to large reduction deformation ( 5 to 20 mm), followed by normal rolling production.
  • This technology can significantly improve the center quality of continuous casting slab (improve low-fold structure, shrinkage, porosity, segregation, etc.), and can produce high-quality thicker than 100mm at a lower compression ratio (1.5 ⁇ 2.5). Thick plate products.
  • the contact area of the 5 to 7 pairs of the casting machine rolls simultaneously contacting the casting blank is significantly increased, so that the load is also It will increase significantly, so the strength and rigidity of the segment must be greatly increased to resist the strong load and large elastic deformation of the segment and the segment roller (or the casting machine roller).
  • the segment roller is made of roller ring and core. The shaft and the intermediate support bearing block, which will increase the size and weight of the segment, which will bring a series of new problems such as the lifting and maintenance of the segment, and the large pressing is at the solidification end of the continuous casting blank.
  • the technical problem to be solved by the present invention is to provide a continuous casting machine fan under the large pressing end of the solidification end of the continuous casting billet
  • the segment and its large pressing method are used to solve the problem that the strength and rigidity of the fan-shaped section of the continuous casting machine and the driving roller are seriously insufficient when the original continuous casting machine system is used in the prior art.
  • an embodiment of the present invention provides a continuous casting machine segment of a continuous casting billet having a large solidification end, including an upper frame, a lower frame, an upper driving roller, and a lower driving on the continuous casting machine segment.
  • the upper driving roller and the pressing device Connected, the upper driving roller is coupled to the upper frame through an upper bearing housing, and the lower driving roller is coupled to the lower frame through a lower bearing housing, the left driven roller group and the right driven roller group being respectively located at the driving roller
  • the left driven roller set is used for clamping the slab before pressing
  • the right driven roller set is used for clamping the pressed slab
  • the diameter of the driving roller and the driven roller The ratio of diameters is from 1.1:1 to 2:1.
  • the opening degree of the right driven roller set and the driving roller is the same as the thickness of the cast slab after pressing.
  • the opening degree of the left driven roller group is the same as the thickness of the casting blank before pressing.
  • the driving roller is a unitary type and is formed by an integral forming process.
  • the present invention also provides a method for solidification end of a continuous casting billet, comprising the following steps:
  • the clamping cylinder applies a certain pressure to the upper frame, so that the opening degree of the left driven roller group is the same as the thickness of the casting blank before pressing, and is used for clamping the casting blank before pressing;
  • the right driven roller set is adjusted so that the opening degree thereof is the same as the distance between the upper and lower driving rollers, and is used for clamping the cast slab after being pressed.
  • the invention adopts a large roller diameter integral driving roller and an upper frame, a lower frame with high strength and high rigidity, and a clamping cylinder with a large carrying capacity; the total deformation amount under large pressing is driven by a large roller diameter.
  • the roller performs large reduction deformation on the continuous casting billet, instead of 5 to 7 pairs of the casting machine rolls, which are usually deformed one by one to complete the total deformation amount under large pressure.
  • the deformation permeability is increased, which is equivalent to the deformation of one rolling pass of the two-roll mill with larger roll diameter, which is more conducive to the improvement of looseness and segregation in the central region of the continuous casting blank.
  • Figure 1 is a front elevational view of a continuous casting machine segment of a continuous casting billet at a solidified end;
  • Figure 2 is a side elevational view of the continuous casting machine segment of the continuous casting billet at the solidification end of the embodiment of the present invention
  • Fig. 3 is a schematic view showing the principle of the large reduction method of the segment of the continuous casting machine under the large solidification end of the continuous casting slab according to the embodiment of the present invention.
  • the invention is directed to the prior art, in the soft reduction system using the original continuous casting machine, when the solidification end of the segment is pressed, the strength and rigidity of the fan-shaped section of the continuous casting machine and the driving roller are seriously insufficient, and In the case that the bearing capacity of the clamping cylinder is insufficient, it is difficult to carry out the large pressing of the solidification end, and the intermediate crack of the casting blank is prone to occur, and a continuous casting machine segment and a large pressing method for the continuous solidification end of the continuous casting billet are provided.
  • a continuous casting machine segment of a continuous casting billet having a large solidification end comprising an upper frame 2 and a lower frame 7 on a continuous casting machine segment.
  • Upper drive roller 3, lower drive roller 5, left driven roller set 8, right driven roller set 9, depressing device 1 and clamping cylinder 10 for clamping upper frame 2 and lower frame 7 maintaining the set interval, the driving roller and the driven roller are rotated by the transmission device 11 to drive the casting blank forward; the upper driving roller 3 is connected to the pressing device 1, and the upper driving roller 3 passes
  • the upper bearing block 4 is coupled to the upper frame 2
  • the lower drive roller 5 is coupled to the lower frame 7 via the lower bearing block 6, the left driven roller set 8 and the right driven roller set 9 being respectively located at the drive roller
  • the left driven roller set 8 is used for clamping the slab before pressing
  • the right driven roller set 9 is used for clamping the pressed slab
  • the ratio of diameters is from 1.1:1 to 2:1.
  • the opening degree of the right driven roller group 9 and the driving roller is the same as the thickness of the cast slab after the pressing.
  • the opening degree of the left driven roller group 8 is the same as the thickness of the slab before the pressing.
  • the driving roller is of a unitary type and is formed by an integral forming process.
  • the present invention also provides a method for solidifying the solidification end of a continuous casting billet, comprising the following steps:
  • the clamping cylinder applies a certain pressure to the upper frame 2, so that the opening degree of the left driven roller group 8 is the same as the thickness of the casting blank before pressing, and is used for clamping the casting blank before pressing;
  • the right driven roller group 9 is adjusted so that the opening degree thereof is the same as the distance between the upper and lower driving rollers, and is used for clamping the cast slab after being pressed. This makes it possible to carry out the press-down deformation only by the large-diameter integrated drive roller 3, and the right-side driven roller 9 on the outlet side does not bear the deformation of the press, which is similar to the rolling deformation of the cast strand by the two-roll mill.
  • the driving roller of the present invention is a large roller diameter integral driving roller (ie, a sectional roller which is not composed of a roller ring, a mandrel and an intermediate supporting bearing seat), and considers an increase in load when a large pressing is performed, and the segment is improved.
  • the strength and rigidity of the upper frame 2 and the lower frame 7 (the amount of increase is 2 to 5 times), and the bearing capacity of the four clamping cylinders 10 is increased correspondingly (the amount of increase is 2 to 5 times).
  • the invention adopts a large roller diameter integral driving roller and an upper frame, a lower frame with high strength and high rigidity, and a clamping cylinder with a large carrying capacity; the total deformation amount under large pressing is driven by a large roller diameter.
  • the roller performs large reduction deformation on the continuous casting billet, instead of 5 to 7 pairs of the casting machine rolls, which are usually deformed one by one to complete the total deformation amount under large pressure.
  • the deformation permeability is increased, which is equivalent to the deformation of one rolling pass of the two-roll mill with larger roll diameter, which is more conducive to the improvement of looseness and segregation in the central region of the continuous casting blank.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)

Abstract

一种连铸坯凝固末端大压下的连铸机扇形段，所述连铸机扇形段包括位于扇形段上的上框架（2）、下框架（7）、上驱动辊（3）、下驱动辊（5）、左从动辊组（8）、右从动辊组（9）、压下装置（1）以及夹紧缸（1），夹紧缸用于夹紧上框架与下框架保持设定间隔；上驱动辊与压下装置相连，上驱动辊通过轴承座（4）连接于上框架上，下驱动辊通过轴承座（6）连接于下框架上，左从动辊组以及右从动辊组分别位于驱动辊的两侧，左从动辊组用于夹紧压下前的铸坯，右从动辊组用于夹紧压下后的铸坯，驱动辊的直径与从动辊的直径之比为1.1:1～2:1。还公开了一种连铸坯凝固末端大压下方法。该连铸机扇形段及其大压下方法使得连铸坯变形渗透性增加，更有利于中心区域疏松、偏析的改善。

Description

连铸坯凝固末端大压下的连铸机扇形段及其大压下方法 技术领域
本发明涉及板坯铸造技术领域，特别是指一种连铸坯凝固末端大压下的连铸机扇形段及其大压下方法。
背景技术
连铸板坯凝固末端大压下技术是在连铸生产线上对连铸板坯凝固末端设置压下辊，当铸坯中心固相率达到80％以上时，对铸坯施加大压下变形(5～20mm)，随后进行正常轧制生产。该技术可显著提高连铸板坯的中心质量(改善低倍组织，缩孔、疏松、偏析等)，可在较低的压缩比(1.5～2.5)下生产出高质量的厚度大于100mm的特厚板产品。
在连铸坯凝固末端实施大压下时，如果铸机扇形段采用整体大压下，则因扇形段的5～7对铸机辊同时接触铸坯时的接触面积显著增加，从而使载荷也随之显著增大，因此必须大大增加扇形段的强度及刚度才能抵抗扇形段及分节辊(或铸机辊)所受的强大的载荷及大的弹性变形，分节辊由辊环、芯轴及中间支撑轴承座组成，这将使扇形段的尺寸及重量增加十分显著，由此将带来扇形段的吊装及维护等一系列新问题，并且因大压下是在连铸坯凝固末端附近实施的，由大压下扇形段的多对辊、小变形压下产生的变形(应变量)渗透性差，传递到铸坯中心区域的应变量小，因而不利于更好地改善中心区域的疏松及偏析缺陷。
因此，当直接采用原有连铸机的轻压下***在扇形段实施凝固末端大压下时，会出现连铸机扇形段、驱动辊的强度及刚度严重不足，以及存在夹紧缸承载力不足，难以实施凝固末端大压下，并易发生铸坯中间裂纹等问题。
发明内容
本发明要解决的技术问题是提供一种连铸坯凝固末端大压下的连铸机扇 形段及其大压下方法，以解决现有技术中采用原有连铸机***在扇形段实施凝固末端大压下时，会出现连铸机扇形段、驱动辊的强度及刚度严重不足，以及存在夹紧缸承载力不足，难以实施凝固末端大压下，并易发生铸坯中间裂纹等问题。
为解决上述技术问题，本发明的实施例提供一种连铸坯凝固末端大压下的连铸机扇形段，包括位于连铸机扇形段上的上框架、下框架、上驱动辊、下驱动辊、左从动辊组、右从动辊组、压下装置以及夹紧缸，所述夹紧缸用于夹紧上框架与下框架保持设定间隔；所述上驱动辊与压下装置相连，所述上驱动辊通过上轴承座连接于上框架上，所述下驱动辊通过下轴承座连接于下框架上，所述左从动辊组以及右从动辊组分别位于驱动辊的两侧，所述左从动辊组用于夹紧压下前的铸坯，所述右从动辊组用于夹紧压下后的铸坯，所述驱动辊的直径与从动辊的直径之比为1.1:1～2:1。
其中，所述右从动辊组和驱动辊的开口度与压下后的铸坯厚度相同。
其中，所述左从动辊组的开口度与压下前的铸坯厚度相同。
其中，所述驱动辊为整体式，采用一体成形工艺制成。
为解决上述技术问题，本发明还提供一种连铸坯凝固末端大压下方法，包括以下步骤：
(1)夹紧缸施加一定压力于上框架上，使左从动辊组的开口度与压下前的铸坯厚度相同，并用于夹紧压下前的铸坯；
(2)设定压下量5～20mm，通过压下装置带动驱动辊对铸坯进行大压下变形；
(3)调整右从动辊组使其开口度与上下驱动辊之间的间距相同，用于夹紧压下后的铸坯。
上述方案中，本发明采用大辊径整体式驱动辊及具有高强度、高刚度的上框架、下框架以及大承载能力的夹紧缸；在大压下时的总变形量通过大辊径驱动辊对连铸坯实施大压下变形，而不是通常扇形段的5～7对铸机辊逐个实施小变形来完成大压下的总变形量。
本发明的上述技术方案的有益效果如下：
1.塑性变形接触面积减少，仅由大辊径整体驱动辊压下，总变形力显著 减小；
2.扇形段夹紧缸所需增加的加紧力也相应减小，同时为了保持上、下扇形段大压下时的强度和刚度所需增加的结构材料及重量也减少；
3.变形渗透性增加，相当于较大辊径的二辊轧机一个轧制道次的变形，这样更有利于连铸坯中心区域疏松、偏析的改善。
附图说明
图1是本发明实施例的连铸坯凝固末端大压下的连铸机扇形段的正视图；
图2是本发明实施例的连铸坯凝固末端大压下的连铸机扇形段的侧视图；
图3是本发明实施例的连铸坯凝固末端大压下的连铸机扇形段的大压下方法的原理示意图。
[主要元件符号说明]
1：压下装置；
2：上框架；
3：上驱动辊；
4：上轴承座；
5：下驱动辊；
6：下轴承座；
7：下框架；
8：左从动辊组；
9：右从动辊组；
10：夹紧缸；
11：传动装置。
具体实施方式
为使本发明要解决的技术问题、技术方案和优点更加清楚，下面将结合附图及具体实施例进行详细描述。
本发明针对现有技术中采用原有连铸机的轻压下***在扇形段实施凝固末端大压下时，会出现连铸机扇形段、驱动辊的强度及刚度严重不足，以及存 在夹紧缸承载力不足，难以实施凝固末端大压下，并易发生铸坯中间裂纹等问题，提供一种连铸坯凝固末端大压下的连铸机扇形段及其大压下方法。
如图1和图2所示的，本发明实施例提供的一种连铸坯凝固末端大压下的连铸机扇形段，包括位于连铸机扇形段上的上框架2、下框架7、上驱动辊3、下驱动辊5、左从动辊组8、右从动辊组9、压下装置1以及夹紧缸10，所述夹紧缸10用于夹紧上框架2与下框架7保持设定间隔，所述驱动辊、从动辊由传动装置11带动进行转动，从而带动铸坯向前运动；所述上驱动辊3与压下装置1相连，所述上驱动辊3通过上轴承座4连接于上框架2上，所述下驱动辊5通过下轴承座6连接于下框架7上，所述左从动辊组8以及右从动辊组9分别位于驱动辊的两侧，所述左从动辊组8用于夹紧压下前的铸坯，所述右从动辊组9用于夹紧压下后的铸坯，所述驱动辊的直径与从动辊的直径之比为1.1:1～2:1。
所述右从动辊组9和驱动辊的开口度与压下后的铸坯厚度相同。所述左从动辊组8的开口度与压下前的铸坯厚度相同。所述驱动辊为整体式，采用一体成形工艺制成。
如图3所示的，本发明还提供一种连铸坯凝固末端大压下方法，包括以下步骤：
(1)夹紧缸施加一定压力于上框架2上，使左从动辊组8的开口度与压下前的铸坯厚度相同，并用于夹紧压下前的铸坯；
(2)设定压下量5～20mm，通过压下装置1带动驱动辊对铸坯进行大压下变形；
(3)调整右从动辊组9使其开口度与上下驱动辊之间的间距相同，用于夹紧压下后的铸坯。这样可实现仅由大辊径整体式驱动辊3实施压下变形，而出口侧的右从动辊9不承担压下变形，此压下方式类似二辊轧机对铸坯的轧制变形。
本发明的驱动辊为大辊径整体式驱动辊(即，不是由辊环、芯轴及中间支撑轴承座组成的分节辊)，同时考虑实施大压下时的负荷增加，提高扇形段的上框架2和下框架7的强度和刚度(提高量为2～5倍)，并相应增大4个夹紧缸10的承载能力(提高量为2～5倍)。
上述方案中，本发明采用大辊径整体式驱动辊及具有高强度、高刚度的上框架、下框架以及大承载能力的夹紧缸；在大压下时的总变形量通过大辊径驱动辊对连铸坯实施大压下变形，而不是通常扇形段的5～7对铸机辊逐个实施小变形来完成大压下的总变形量。
本发明的上述技术方案的有益效果如下：
1.塑性变形接触面积减少，仅由大辊径整体驱动辊压下，总变形力显著减小；
2.扇形段夹紧缸所需增加的加紧力也相应减小，同时为了保持上、下扇形段大压下时的强度和刚度所需增加的结构材料及重量也减少；
3.变形渗透性增加，相当于较大辊径的二辊轧机一个轧制道次的变形，这样更有利于连铸坯中心区域疏松、偏析的改善。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明所述原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (5)

  1. 一种连铸坯凝固末端大压下的连铸机扇形段，包括位于连铸机扇形段上的上框架、下框架、上驱动辊、下驱动辊、左从动辊组、右从动辊组、压下装置以及夹紧缸，其特征在于，所述夹紧缸用于夹紧上框架与下框架保持设定间隔；所述上驱动辊与压下装置相连，所述上驱动辊通过上轴承座连接于上框架上，所述下驱动辊通过下轴承座连接于下框架上，所述左从动辊组以及右从动辊组分别位于驱动辊的两侧，所述左从动辊组用于夹紧压下前的铸坯，所述右从动辊组用于夹紧压下后的铸坯，所述驱动辊的直径与从动辊的直径之比为1.1:1～2:1。
  2. 根据权利要求1所述的连铸坯凝固末端大压下的连铸机扇形段，其特征在于，所述右从动辊组和驱动辊的开口度与压下后的铸坯厚度相同。
  3. 根据权利要求2所述的连铸坯凝固末端大压下的连铸机扇形段，其特征在于，所述左从动辊组的开口度与压下前的铸坯厚度相同。
  4. 根据权利要求3所述的连铸坯凝固末端大压下的连铸机扇形段，其特征在于，所述驱动辊为整体式，采用一体成形工艺制成。
  5. 一种连铸坯凝固末端大压下方法，其特征在于，包括以下步骤：
    (1)夹紧缸施加一定压力于上框架上，使左从动辊组的开口度与压下前的铸坯厚度相同，并用于夹紧压下前的铸坯；
    (2)设定压下量5～20mm，通过压下装置带动驱动辊对铸坯进行大压下变形；
    (3)调整右从动辊组使其开口度与上下驱动辊之间的间距相同，用于夹紧压下后的铸坯。
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