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 PDFInfo
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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
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000005266 casting Methods 0.000 title abstract description 5
- 230000007704 transition Effects 0.000 claims abstract description 78
- 238000000034 method Methods 0.000 claims description 17
- 238000009749 continuous casting Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 abstract description 9
- 238000005058 metal casting Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
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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
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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
- 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
Description
Claims (6)
- 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。
- 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。
- 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。
- 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。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19855234.1A EP3845329B1 (en) | 2018-08-31 | 2019-08-16 | Continuous-curvature convex roll for continuously casting bloom, and manufacturing method therefor |
JP2021510908A JP7135205B2 (ja) | 2018-08-31 | 2019-08-16 | ブルーム連続鋳造用の連続曲率凸形ロール及びその製造方法 |
US17/271,094 US11298744B2 (en) | 2018-08-31 | 2019-08-16 | Continuous-curvature convex roll for continuously casting bloom, and manufacturing method therefor |
KR1020217008839A KR102455603B1 (ko) | 2018-08-31 | 2019-08-16 | 대형 블룸의 연속주조를 위한 연속곡률 볼록롤 및 그의 제조방법 |
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CN201811011524.5 | 2018-08-31 | ||
CN201811011524.5A CN110871264B (zh) | 2018-08-31 | 2018-08-31 | 连铸大方坯连续曲率凸形辊制造方法 |
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US (1) | US11298744B2 (zh) |
EP (1) | EP3845329B1 (zh) |
JP (1) | JP7135205B2 (zh) |
KR (1) | KR102455603B1 (zh) |
CN (1) | CN110871264B (zh) |
WO (1) | WO2020042923A1 (zh) |
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CN112157235A (zh) * | 2020-09-11 | 2021-01-01 | 北京科技大学 | 一种连铸板坯凝固末端凸形压下辊及其制备工艺 |
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- 2018-08-31 CN CN201811011524.5A patent/CN110871264B/zh active Active
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2019
- 2019-08-16 JP JP2021510908A patent/JP7135205B2/ja active Active
- 2019-08-16 EP EP19855234.1A patent/EP3845329B1/en active Active
- 2019-08-16 US US17/271,094 patent/US11298744B2/en active Active
- 2019-08-16 KR KR1020217008839A patent/KR102455603B1/ko active IP Right Grant
- 2019-08-16 WO PCT/CN2019/101036 patent/WO2020042923A1/zh unknown
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KR20210053307A (ko) | 2021-05-11 |
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US11298744B2 (en) | 2022-04-12 |
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