WO2020042923A1 - 连铸大方坯连续曲率凸形辊及其制造方法 - Google Patents

连铸大方坯连续曲率凸形辊及其制造方法 Download PDF

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WO2020042923A1
WO2020042923A1 PCT/CN2019/101036 CN2019101036W WO2020042923A1 WO 2020042923 A1 WO2020042923 A1 WO 2020042923A1 CN 2019101036 W CN2019101036 W CN 2019101036W WO 2020042923 A1 WO2020042923 A1 WO 2020042923A1
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curve
continuous
convex
segment
transition
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PCT/CN2019/101036
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English (en)
French (fr)
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徐荣军
刘俊江
万根节
李成斌
柳向椿
孟庆玉
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宝山钢铁股份有限公司
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Priority to EP19855234.1A priority Critical patent/EP3845329B1/en
Priority to JP2021510908A priority patent/JP7135205B2/ja
Priority to US17/271,094 priority patent/US11298744B2/en
Priority to KR1020217008839A priority patent/KR102455603B1/ko
Publication of WO2020042923A1 publication Critical patent/WO2020042923A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • 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
    • 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
    • B22D11/16—Controlling or regulating processes or operations

Definitions

  • the invention belongs to the field of metal casting, and particularly relates to a manufacturing method for post-processing or post-processing equipment for casting billets on site.
  • the application publication number is CN107377919, and the Chinese invention patent application with the application publication date of 2017.11.24 discloses a "method for increasing the density of the bearing steel casting slab center", which discloses a convex roller.
  • a convex 1 is provided in the middle of the convex roller, and the convex 1 and the two ends of the convex roller transition with a gradual curvature curve.
  • the application publication number is CN 106001475, and the Chinese invention patent application with the application publication date of 2016.10.12 discloses a "continuous casting alloy steel bloom billet with progressive curvature convex roll and heavy pressing process", which design the roll as a Convex roller structure with gradual curvature; the convex roller has the height of the boss that can compensate the volume shrinkage in the height direction, and the width of the boss that can cover the most severely loose and segregated areas in the width direction.
  • the arc of the arc-changing area is controlled at a radius of curvature r of not more than 30 mm.
  • the application publication number is CN 105983668 A
  • the Chinese invention patent application with the application publication date of 2016.10.05 discloses a "light reduction roller, a light reduction device with the same, and a method for manufacturing a slab", which discloses "light
  • the diameter of the end portion of the reduction roller is smaller than the diameter of the intermediate portion.
  • the convex-shaped roller is gently pressed, although the smoothness of the contour curve of the boss is considered separately, it is only continuous under the first derivative (that is, the curve is tangent to the curve and the curve is tangent to the line).
  • These tangent points are still singular points, that is, stress concentration points.
  • the intersection of the arc curve and the arc curve only satisfies the order of 0, which is not a smooth curve in the true sense.
  • the slab is still unavoidably stressed. Because the surface temperature of the continuous slab is usually 700-900 ° C, and the surface temperature is uneven, the singularity point becomes the stress concentration point.
  • the slab is being rolled. The surface is prone to cracks during deformation.
  • the projection length AB of the transition curve on the x-axis must be greater than or equal to the height of the boss, that is, the sum of the minimum radii of the two arcs (R 1 + R 2 ) must be greater than It is equal to the height H of the boss, otherwise the two arcs cannot be connected.
  • the length of the straight segment DE at the center of the boss is determined by the width of the unsolidified liquid core at the center of the slab.
  • the excessive curve is too long, which means that the straight sections AB and EF at both ends of the boss become shorter, which is not good for reducing the rolling pressure and reducing the drag resistance.
  • the technical problem to be solved by the present invention is to provide a method for manufacturing a continuous casting convex roll with continuous curvature.
  • the contour curve of the working part of the continuous curvature convex roller body has continuous first derivative, continuous second derivative, and continuous curvature, and a method for forming a transition curve with continuous curvature is given.
  • the continuous curvature convex roll can uniformly deform the cast slab in the deformation area and reduce the occurrence of cracks; the continuous curvature convex roll can shorten the transition curve, which can further reduce the rolling pressure and reduce the drawing resistance.
  • the technical solution of the present invention is to provide a method for manufacturing a continuous-casting continuous-curve convex roll of blooms, which is characterized by:
  • the outer contour curve of the working portion of the continuous curvature convex roller body is composed of a first straight segment AB, a first transition curve segment BC, a middle straight segment CD, a second transition curve segment DE, and a second straight segment EF;
  • the first transition curve segment BC, the first straight line segment AB, and the intermediate straight line segment CD have continuous first-order derivatives, continuous second-order derivatives, and continuous curvatures, forming a first transition curve with continuous curvature;
  • the second transition curve segment DE, the middle straight line segment CD, and the second straight line segment EF have continuous first-order derivatives, continuous second-order derivatives, and continuous curvatures, forming a second transition curve with continuous curvature;
  • the first transition curve BC and the second transition curve DE are mirror-symmetrical;
  • the boss can be over-welded on the working part of the roll body.
  • the working part of the roll body is processed according to the shape of the outer contour curve and rotated along the central axis O 1 O 2 to form a continuous curvature convex shape.
  • the convex roll manufactured according to the continuous casting convex billet continuous curvature convex roll manufacturing method can uniformly deform the cast slab in the deformed area and reduce the occurrence of cracks;
  • the transition curve of a convex roll made according to the method for manufacturing a continuous casting convex roll with continuous curvature can shorten the rolling curve, which can further reduce the rolling pressure and reduce the drawing resistance.
  • the method for forming the transition curve with continuous curvature is as follows:
  • the origin of the coordinate is at the middle O point, the two points O and B satisfy the second derivative continuous, and the point A meets the first derivative continuous;
  • the curve equation of the boss of the convex roller is a curve axisymmetric along the center A, the curve section OA is a curve on the left half, and the curve section AB is a curve on the right half;
  • Curve section OA is used as the left half curve of the boss, and curve section AB is used as the right half curve of the boss, and the middle is connected by a horizontal straight line.
  • Equations (1) to (8) are substituted into equations (9), (10), and (11) to obtain: Simultaneously solving an 8-element linear equation:
  • This curve is a smooth curve because its 0th, 1st, and 2nd derivative are continuous, so its curvature is continuous.
  • the second transition curve DE can be formed by mirroring the first transition curve BC along the middle point of the middle straight segment CD as the center line.
  • a continuous-cast bloom billet with continuous curvature can also be obtained.
  • the continuous curvature convex roll manufactured by this technical solution can uniformly deform the cast slab in the deformation area and reduce the occurrence of cracks; after using the technical solution of the present invention, the transition curve of the convex roll can be shortened, which can further reduce the rolling pressure and Reduce drawing resistance;
  • the convex roller manufactured by this technical solution is used to implement the solidification end heavy reduction technology, which avoids the large deformation resistance of the solidified green shell on both sides, and can perform heavy reduction on the middle of the cast slab to improve the casting.
  • the center of the slab is dense. At the same time, because the contact area between the convex roller and the slab is small, the friction force is reduced, so the drag resistance of the slab continuous casting process is also reduced.
  • FIG. 1 is a schematic diagram of an outline shape of a convex roll of the present invention
  • FIG. 2 is a schematic diagram of a horizontal cross-section coordinate system of a boss according to the present invention.
  • An object of the present invention is to provide a light reduction roll capable of sufficiently reducing defects generated on the surface of a rolled material.
  • the contour curve of the working portion of the continuous curvature convex roller body of the present invention is composed of a first straight segment AB, a first transition curve segment BC, a middle straight segment CD, a second transition curve segment DE, and a second Straight line segment EF.
  • the first transition curve segment BC, the first straight line segment AB, and the intermediate straight line segment CD have continuous first-order derivatives, continuous second-order derivatives, and continuous curvatures.
  • the second transition curve segment DE, the middle straight line segment CD, and the second straight line segment EF have continuous first-order derivatives, continuous second-order derivatives, and continuous curvature.
  • the curve equation of the boss of the convex roller is an axisymmetric curve along the center A
  • the curve OA is a curve on the left half
  • the curve AB is a curve from the half.
  • Curve OA is the left half curve of the boss
  • curve AB is the right half curve of the boss
  • the middle is connected by a horizontal straight line.
  • the curve equation of the first transition curve of the convex roller boss is obtained by the following steps:
  • Equations (1) to (8) are substituted into equations (9), (10), and (11) to obtain: Simultaneously solving an 8-element linear equation:
  • This curve is a smooth curve because its 0th, 1st, and 2nd derivative are continuous, so its curvature is continuous.
  • the above-mentioned second transition curve DE can be formed by mirroring the first transition curve BC along the middle point of the middle straight segment CD as the center line.
  • This technical solution uses a convex roller to control the softening of the solidification end and comprehensively use it to reduce the looseness of the center of the slab, thereby increasing the center density of the slab and improving the internal quality of the rolled material (a large amount of The volume shrinks, so a larger reduction is needed to compensate for the volume shrinkage of the slab.
  • the slab will produce deformation resistance, which is mainly concentrated on the solidified shell on both sides).
  • the invention adopts the technology of heavy-duty pressing at the solidified end of the convex roller, which avoids the large deformation resistance of the slab that has solidified on both sides, and enables the middle of the slab to be pressed to increase the center compactness of the slab.
  • the key point is that the continuous curvature convex roller manufactured by this technical solution is operated in the light pressing mode, which can uniformly deform the slab in the deformation area and reduce the occurrence of cracks.
  • the transition curve of the convex roller manufactured by the present invention can Shortening can further reduce rolling pressure and reduce drawing resistance.
  • the blank is first cast according to the shape and size requirements of the convex roll of the present invention; the working part of the roll body is processed by rotating and processing along the axis O 1 O 2 according to the outline shape of FIG. 1 to form a continuous curvature convex roll.
  • the bosses can be deposited on the working part of the roll body first, and the working part of the roll body is processed by rotating along the axis O 1 O 2 according to the outline shape of FIG. 1 to form a continuous curvature convex roll.
  • the first straight line segment AB, the third straight line segment EF, the middle straight line segment CD, the first transition curve BC, and the second transition curve DE are represented by letters at the beginning and end of the line segment as much as possible, so that the description of the text is concise.
  • the length of the roll work roll is 500mm
  • the length of the middle straight line CD is 150mm
  • the projection length of the transition curve BC and DE on the x-axis is 40mm
  • the height of the boss H 20mm
  • the equation of the transition curve BC curve is:
  • the second transition curve DE can be formed by mirroring the first transition curve BC along the middle point of the middle straight segment CD as the center line.
  • the length of the roll work roll is 500 mm
  • the length of the middle straight segment is 150 mm
  • the projection length of the transition curves BC and DE on the x axis is 60 mm
  • the height of the boss H 20mm
  • the transition curve BC curve equation is:
  • transition curve DE can be formed by mirroring the transition curve BC along the midpoint of the line segment CD as the center line.
  • the rest is the same as in the first embodiment.
  • the length of the roll work roll is 500 mm
  • the length of the middle straight segment is 150 mm
  • the projection length of the transition curves BC and DE on the x axis is 60 mm
  • the height of the boss H 30mm
  • the transition curve BC curve equation is:
  • transition curve DE can be formed by mirroring the transition curve BC along the midpoint of the line segment CD as the center line.
  • the rest is the same as in the first embodiment.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the length of the roll work roll is 500 mm
  • the projection length of the transition curves BC and DE on the x axis is 40 mm
  • the height of the boss H 15mm
  • the transition curve BC curve equation is:
  • transition curve DE can be formed by mirroring the transition curve BC along the midpoint of the line segment CD as the center line.
  • the rest is the same as in the first embodiment.
  • the first derivative is continuous
  • the second derivative is continuous
  • the curvature is continuous
  • the continuous curvature convex roll manufactured according to the technical solution of the present invention can uniformly deform the cast slab in the deformation area and reduce the occurrence of cracks; the transition curve of the continuous curvature convex roll can be shortened, which can further reduce the rolling pressure and reduce the drawing resistance.
  • the invention can be widely used in the field of metal casting.

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

Abstract

一种连铸大方坯连续曲率凸形辊及其制造方法，属金属铸造领域。其连续曲率凸形辊辊身工作部分的外轮廓曲线，由第一直线段(AB)、第一过渡曲线段(BC)、中间直线段(CD)、第二过渡曲线段(DE)和第二直线段(EF)构成；其第一过渡曲线段(BC)和第一直线段(AB)、中间直线段(CD)的一阶导数连续、二阶导数连续、曲率连续，构成一个具有连续曲率的第一过渡曲线；所述的第一过渡曲线(BC)与第二过渡曲线(DE)镜像对称。按照技术方案制造的连续曲率凸形辊，可使变形区域铸坯均匀变形，减少裂纹发生；凸形辊的过渡曲线可缩短，能进一步降低轧制压力和减少拉坯阻力。可广泛用于金属铸造领域。

Description

连铸大方坯连续曲率凸形辊及其制造方法 技术领域
本发明属于金属铸造领域，尤其涉及一种用于在现场对铸造坯料进行后处理或后加工装置的制造方法。
背景技术
申请公布号为CN 107377919 A，申请公布日为2017.11.24的中国发明专利申请，公开了一种“提高轴承钢铸坯中心致密度的方法”，其中公开了一种述凸形辊，所述凸形辊的中部设有凸起1，所述凸起1与所述凸形辊的两端以渐变曲率曲线过渡。
申请公布号为CN 106001475 A，申请公布日为2016.10.12的中国发明专利申请，公开了一种“连铸合金钢大方坯渐变曲率凸形辊及重压下工艺”，其将轧辊设计成一种渐变曲率的凸形辊结构；凸形辊具有能够补偿高度方向体积收缩量的凸台高度，以及能够覆盖宽度方向最严重疏松、偏析区域的凸台宽度。其变弧区圆弧控制在曲率半径r不大于30mm。
申请公布号CN 105983668 A，申请公布日为2016.10.05的中国发明专利申请，公开了一种“轻压下辊、具有其的轻压下装置及铸坯的制造方法”，其中公开了“轻压下辊的端部的直径比中间部的直径小，其中，在观察轻压下辊的包含旋转轴线的截面时，中间部与端部之间的外周在端部侧具有朝向旋转轴线鼓出的第1圆弧、在中间部侧具有朝向与第1圆弧的鼓出方向相反的方向鼓出的第2圆弧，与第1圆弧和第2圆弧这两者相切的切线和旋转轴线所成的角度为40°以下。”
发明内容
在上述个技术方案中的轻压下凸形辊，尽管分别考虑了凸台轮廓曲线的光滑，但仅在一阶导数情况下的连续(即曲线与曲线相切、曲线与直线相切)，这些切点处仍然为奇异点即应力集中点，如圆弧曲线与圆弧曲线相交仅满足0阶连续，并不是真正意义上的光滑曲线。铸坯在轧制变形过程中，仍不可避免的受到 应力，由于连铸坯表面温度低通常在700-900℃，且表面温度不均匀，奇异点成为应力集中点，此处铸坯在轧制变形过程中表面容易产生裂纹。
同时采用两个圆弧曲线作为过渡曲线时，过渡曲线的在x轴上的投影长度AB必须大于等于凸台高度H，即两个圆弧的最小半径之和(R 1+R 2)必须大于等于凸台高度H，否则两个圆弧无法连接。
由于辊身的总长度一定，凸台中心的直线段DE长度由铸坯中心未凝固的液芯宽度决定。过度曲线过长，就意味着凸台两端的直线段AB和EF变短，如此对于降低轧制压力和减少拉坯阻力都是不利的。
本发明所要解决的技术问题是提供一种连铸大方坯连续曲率凸形辊制造方法。该连续曲率凸形辊辊身工作部分轮廓曲线，一阶导数连续、二阶导数连续、曲率连续，并给出具有连续曲率的过渡曲线的形成方法。该连续曲率凸形辊可以使变形区域铸坯均匀变形，减少裂纹发生；该连续曲率凸形辊的过渡曲线可以缩短，可进一步降低轧制压力和减少拉坯阻力。
本发明的技术方案是：提供一种连铸大方坯连续曲率凸形辊制造方法，其特征是：
所述连续曲率凸形辊辊身工作部分的外轮廓曲线，由第一直线段AB、第一过渡曲线段BC、中间直线段CD、第二过渡曲线段DE和第二直线段EF构成；
其第一过渡曲线段BC和第一直线段AB、中间直线段CD的一阶导数连续、二阶导数连续、曲率连续，构成一个具有连续曲率的第一过渡曲线；
同样，第二过渡曲线段DE和中间直线段CD、第二直线段EF的一阶导数连续、二阶导数连续、曲率连续，构成一个具有连续曲率的第二过渡曲线；
所述的第一过渡曲线BC与第二过渡曲线DE镜像对称；
制造、加工所述的凸形辊时，首先按照凸形辊的形状和尺寸要求，先铸造出毛坯，辊身工作部分的加工按照所述外轮廓曲线的形状，沿中心轴线O 1O 2旋转加工即成连续曲率凸形辊；
对于已有的平辊，可先在辊身工作部分堆焊出凸台，辊身工作部分的加工按照所述外轮廓曲线的形状，沿中心轴线O 1O 2旋转加工即成连续曲率凸形辊；
按照所述的连铸大方坯连续曲率凸形辊制造方法所制得的凸形辊，可以使变 形区域铸坯均匀变形，减少裂纹发生；
按照所述的连铸大方坯连续曲率凸形辊制造方法所制得的凸形辊，其过渡曲线可以缩短，可进一步降低轧制压力和减少拉坯阻力。
具体的，所述的具有连续曲率的过渡曲线的形成方法如下：
建立一个坐标系，坐标原点在中间O点，O、B两点满足二阶导数连续，A点满足一阶导数连续；
所述凸形辊的凸台的曲线方程，为一个沿中心A点轴对称的曲线，曲线段OA为左半边的曲线，曲线段AB为右半边的曲线；
曲线段OA作为凸台左半边曲线，曲线段AB作为凸台右半边曲线，中间由水平直线相连。
进一步的，所述的曲线方程
限制条件如下：
O点：x＝0：
y＝0；       (1)
Figure PCTCN2019101036-appb-000001
Figure PCTCN2019101036-appb-000002
A点：x＝L/2：
y＝H；         (4)
Figure PCTCN2019101036-appb-000003
B点：x＝L:
y＝0；        (6)
Figure PCTCN2019101036-appb-000004
Figure PCTCN2019101036-appb-000005
即一共有8个限制条件；
假定凸台过渡曲线为多项式形式，因有8个限制条件，则应有：
y＝a 7x 7+a 6x 6+a 5x 5+a 4x 4+a 3x 3+a 2x 2+a 1x+a 0        (9)
Figure PCTCN2019101036-appb-000006
Figure PCTCN2019101036-appb-000007
(1)～(8)式条件代入式(9)、(10)、(11)得：用联立解8元一次方程得：
a 0＝0；a 1＝0；a 2＝0；
Figure PCTCN2019101036-appb-000008
a 7＝0；
Figure PCTCN2019101036-appb-000009
此曲线由于其0阶、1阶和2阶导数连续，因此其曲率连续，属于光滑曲线。
更进一步的，所述的第二过渡曲线DE，可用第一过渡曲线BC沿着中间直线段CD的中点作为中心线镜像形成。
根据前述方法，还可获得连铸大方坯连续曲率凸形辊。
与现有技术比较，本发明的优点是：
1.采用本技术方案制造的连续曲率凸形辊可以使变形区域铸坯均匀变形，减少裂纹发生；采用本发明的技术方案后，凸形辊的过渡曲线可以缩短，可进一步降低轧制压力和减少拉坯阻力；
2.采用本技术方案制造的凸形辊进行凝固末端轻压下控制，可来降低铸坯的中心疏松，进而提高铸坯中心致密度，改善轧材内部质量；
3.采用本技术方案制造的凸形辊来实施凝固末端重压下技术，避开了两侧已经凝固的坯壳产生较大的变形抗力，能够对铸坯的中部实施重压下，提高铸坯中心致密度，同时由于凸形辊与铸坯接触面积小，摩擦力减小，因此铸坯连铸过程的拉坯阻力也减少。
附图说明
图1是本发明凸形轧辊的轮廓形状示意图；
图2是本发明凸台水平方向剖面坐标系示意图。
具体实施方式
下面结合附图和实施例对本发明做进一步说明。
本发明的目的在于提供能够充分地减少轧制材料的表面所产生的缺陷的轻压下辊。
针对上述目的，本发明采用了如下技术方案：
如图1中所示，本发明连续曲率凸形辊辊身工作部分的轮廓曲线，由第一直线段AB、第一过渡曲线段BC、中间直线段CD、第二过渡曲线段DE和第二直线段EF构成。
其中，第一过渡曲线段BC和第一直线段AB、中间直线段CD的一阶导数连续、二阶导数连续、曲率连续。
同样，第二过渡曲线段DE和中间直线段CD、第二直线段EF的一阶导数连续、二阶导数连续、曲率连续。
本技术方案中具有连续曲率的第一过渡曲线的形成方法如下：
建立如图2所示的坐标系(坐标原点在中间O点，O、B两点满足二阶导数连续，A点满足一阶导数连续)。
本技术方案中，凸形辊的凸台的曲线方程为沿中心A点轴对称曲线，曲线OA为左半边的曲线，曲线AB为由半边的曲线。曲线OA作为凸台左半边曲线，曲线AB作为凸台右半边曲线，中间由水平直线相连。
所述凸形辊凸台的第一过渡曲线的曲线方程通过下列步骤获得：
限制条件如下：
O点：x＝0：
y＝0；          (1)
Figure PCTCN2019101036-appb-000010
Figure PCTCN2019101036-appb-000011
A点：x＝L/2：
y＝H；       (4)
Figure PCTCN2019101036-appb-000012
B点：x＝L:
y＝0；        (6)
Figure PCTCN2019101036-appb-000013
Figure PCTCN2019101036-appb-000014
即一共有8个限制条件。
假定凸台过渡曲线为多项式形式，因有8个限制条件，则应有：
y＝a 7x 7+a 6x 6+a 5x 5+a 4x 4+a 3x 3+a 2x 2+a 1x+a 0      (9)
Figure PCTCN2019101036-appb-000015
Figure PCTCN2019101036-appb-000016
(1)～(8)式条件代入式(9)、(10)、(11)得：用联立解8元一次方程得：
a 0＝0；a 1＝0；a 2＝0；
Figure PCTCN2019101036-appb-000017
a 7＝0。
Figure PCTCN2019101036-appb-000018
此曲线由于其0阶、1阶和2阶导数连续，因此其曲率连续，属于光滑曲线。
上述的第二过渡曲线DE，可用第一过渡曲线BC沿着中间直线段CD的中点作为中心线镜像形成。
采用本发明技术方案的有益效果为：
本技术方案通过凸形辊进行凝固末端轻压下控制、综合运用来降低铸坯的中心疏松，进而提高铸坯中心致密度，改善轧材内部质量(在铸坯凝固过程中会产生很大的体积收缩，所以需要更大的压下量来补偿铸坯体积收缩，在压下过程中，铸坯会产生变形抗力，其主要集中在两侧已经凝固的坯壳上)。
本发明采用凸形辊凝固末端重压下技术，避开了两侧已经凝固的坯壳产生较 大的变形抗力，能够对铸坯的中部实施重压下，提高铸坯中心致密度。
同时，由于凸形辊与铸坯接触面积小，摩擦力减小，因此铸坯连铸过程的拉坯阻力也减少。
此外，关键的一点在于，采用本技术方案制造的连续曲率凸形辊进行轻下压模式操作，可以使变形区域铸坯均匀变形，减少裂纹发生；采用本发明制造的凸形辊的过渡曲线可以缩短，可进一步降低轧制压力和减少拉坯阻力。
实施本发明时，首先按照本发明凸形辊的形状和尺寸要求，先铸造出毛坯；辊身工作部分加工按照图1外廓形状沿轴线O 1O 2旋转加工即成连续曲率凸形辊。对于已有的平辊，可先在辊身工作部分堆焊出凸台，辊身工作部分加工按照图1外廓形状沿轴线O 1O 2旋转加工即成连续曲率凸形辊。
实施例：
对于前述的第一直线段AB、第三直线段EF、中间直线段CD、第一过渡曲线BC和第二过渡曲线DE，尽量以其线段首末端的字母来代表，以便于文字描述简洁。
实施例一：
在图2坐标系(坐标原点在中间O点，O、B两点满足二阶导数连续，A点满足一阶导数连续)下，轧辊工作辊身长度500mm，两端直线段长度AB＝EF＝135mm，中间直线段CD长度150mm，过渡曲线BC和DE在x轴上的投影长40mm，凸台高度H＝20mm，过渡曲线BC曲线方程为：
y＝-4.882813×10 -9x 6+1.171875×10 -6x 5-9.375×10 -5x 4+2.5×10 -3x 3
第二过渡曲线DE可用第一过渡曲线BC沿着中间直线段CD的中点作为中心线镜像形成。
实施例二：
在图2坐标系下，轧辊工作辊身长度500mm，两端直线段长度AB＝EF＝115mm，中间直线段CD长度150mm，过渡曲线BC和DE在x轴上的投影长60mm，凸台高度H＝20mm，过渡曲线BC曲线方程为：
y＝-4.286694×10 -10x 6+1.543210×10 -7x 5-1.851852×10 -5x 4+7.407407×10 -4x 3
同样地，过渡曲线DE可用过渡曲线BC沿着线段CD的中点作为中心线镜像形成。
其余同实施例一。
实施例三：
在图2坐标系下，轧辊工作辊身长度500mm，两端直线段长度AB＝EF＝115mm，中间直线段CD长度150mm，过渡曲线BC和DE在x轴上的投影长60mm，凸台高度H＝30mm，过渡曲线BC曲线方程为：
y＝-6.430041×10 -10x 6+2.314815×10 -7x 5-2.777778×10 -5x 4+1.111111×10 -3x 3
同样地，过渡曲线DE可用过渡曲线BC沿着线段CD的中点作为中心线镜像形成。
其余同实施例一。
实施例四：
在图2坐标系下，轧辊工作辊身长度500mm，两端直线段长度AB＝EF＝135mm，中间直线段CD长度150mm，过渡曲线BC和DE在x轴上的投影长40mm，凸台高度H＝15mm，过渡曲线BC曲线方程为：
y＝-3.6621096×10 -9x 6+8.789063×10 -7x 5-7.031250×10 -5x 4+1.875000×10 -3x 3
同样地，过渡曲线DE可用过渡曲线BC沿着线段CD的中点作为中心线镜像形成。
其余同实施例一。
由于按照本发明技术方案制造的凸形辊辊身工作部分的轮廓曲线，一阶导数连续、二阶导数连续、曲率连续。
按照本发明技术方案制造的连续曲率凸形辊，可以使变形区域铸坯均匀变形，减少裂纹发生；该连续曲率凸形辊的过渡曲线可以缩短，可进一步降低轧制压力和减少拉坯阻力。
本发明可广泛用于金属铸造领域。

Claims (6)

  1. 一种连铸大方坯连续曲率凸形辊制造方法，其特征是：
    所述连续曲率凸形辊辊身工作部分的外轮廓曲线，由第一直线段(AB)、第一过渡曲线段(BC)、中间直线段(CD)、第二过渡曲线段(DE)和第二直线段(EF)构成；
    其第一过渡曲线段(BC)和第一直线段(AB)、中间直线段(CD)的一阶导数连续、二阶导数连续、曲率连续，构成一个具有连续曲率的第一过渡曲线；
    第二过渡曲线段(DE)和中间直线段(CD)、第二直线段(EF)的一阶导数连续、二阶导数连续、曲率连续，构成一个具有连续曲率的第二过渡曲线；
    所述的第一过渡曲线(BC)与第二过渡曲线(DE)镜像对称；
    在制造、加工所述的凸形辊时，首先按照凸形辊的形状和尺寸要求，先铸造出毛坯，辊身工作部分的加工按照所述外轮廓曲线的形状，沿凸形辊的中心轴线(O 1O 2)旋转加工，即成所述的连续曲率凸形辊；
    或者，对于已有的平辊，先在辊身工作部分堆焊出凸台，辊身工作部分的加工按照所述外轮廓曲线的形状，沿凸形辊的中心轴线(O 1O 2)旋转加工即成连续曲率凸形辊。
  2. 按照权利要求1所述的连铸大方坯连续曲率凸形辊制造方法，其特征是所述的具有连续曲率的第一、第二过渡曲线段的形成方法如下：
    建立一个坐标系，确定坐标原点(0，0)、中心点(L/2，H)以及端点(L，0)，生成一条上凸曲线通过所述原点、中心点以及所述端点，且所述原点、所述端点两点满足二阶导数连续，在所述中心点满足一阶导数连续，L为第一、第二过渡曲线的在x轴上的投影长度之和，H为凸形辊的凸台高度；
    所述上凸曲线为一个沿中心点的垂直线轴对称的曲线，第一曲线段(OA)为左半边的曲线，第二曲线段(AB)为右半边的曲线；
    第一曲线段(OA)作为所述第一过渡曲线段；第二曲线段(AB)作为所述的第二过渡曲线段。
  3. 按照权利要求2所述的连铸大方坯连续曲率凸形辊制造方法，其特征是所述上凸曲线方程为：
    Figure PCTCN2019101036-appb-100001
  4. 一种连铸大方坯连续曲率凸形辊，其特征是：
    所述连续曲率凸形辊辊身工作部分的外轮廓曲线，由第一直线段(AB)、第一过渡曲线段(BC)、中间直线段(CD)、第二过渡曲线段(DE)和第二直线段(EF)构成；
    其第一过渡曲线段(BC)和第一直线段(AB)、中间直线段(CD)的一阶导数连续、二阶导数连续、曲率连续，构成一个具有连续曲率的第一过渡曲线；
    第二过渡曲线段(DE)和中间直线段(CD)、第二直线段(EF)的一阶导数连续、二阶导数连续、曲率连续，构成一个具有连续曲率的第二过渡曲线；
    所述的第一过渡曲线(BC)与第二过渡曲线(DE)镜像对称。
  5. 如权利要求4所述的连铸大方坯连续曲率凸形辊，其特征是：
    在一个坐标系中，确定坐标原点(0，0)、中心点(L/2，H)以及端点(L，0)，一条上凸曲线通过所述原点、中心点以及所述端点，且在所述原点、所述端点两点满足二阶导数连续，在所述中心点满足一阶导数连续，L为第一、第二过渡曲线的在x轴上的投影长度之和，H为凸形辊的凸台高度；
    所述上凸曲线为一个沿中心点的垂直线呈轴对称的曲线，第一曲线段(OA)为左半边的曲线，第二曲线段(AB)为右半边的曲线；
    所述第一过渡曲线段按照所述第一曲线段(OA)构造；所述的第二过渡曲线段按照所述第二曲线段(AB)构造。
  6. 如权利要求5所述的连铸大方坯连续曲率凸形辊，其特征是：
    所述上凸曲线的方程为：
    Figure PCTCN2019101036-appb-100002
PCT/CN2019/101036 2018-08-31 2019-08-16 连铸大方坯连续曲率凸形辊及其制造方法 WO2020042923A1 (zh)

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