CN105414183B - Roll-casting of magnesium alloy plate prepares the process of wide sheet - Google Patents

Roll-casting of magnesium alloy plate prepares the process of wide sheet Download PDF

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Publication number
CN105414183B
CN105414183B CN201510854891.1A CN201510854891A CN105414183B CN 105414183 B CN105414183 B CN 105414183B CN 201510854891 A CN201510854891 A CN 201510854891A CN 105414183 B CN105414183 B CN 105414183B
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rolling
blank
casting
area
thickness
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CN105414183A (en
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刘光明
姬亚锋
马立峰
黄志权
周存龙
黄庆学
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Taiyuan University of Science and Technology
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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
    • B21B1/463—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 in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/22—Lateral spread control; Width control, e.g. by edge rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/56—Elongation control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0021—Cutting or shearing the product in the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/06—Width
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/12—Length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature

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

Abstract

The preparation method of magnesium alloy wide-width thin plate belongs to magnesium alloy wide-width thin plate rolling technical field, and roll-casting of magnesium alloy plate prepares the process of wide sheet, it is characterized in that：The rolling mill practice of magnesium alloy wide-width thin plate includes the following steps：（One）, wide sheet rolling blank geomery determine, wide sheet rolling blank cross section includes intermediate thin area, the thick area of intermediate thin area both sides setting, is connected, the sotck thinkness of transition region is continuously reduced from thick area to intermediate thin area between thick area and intermediate thin area using transition region；（Two）, wide sheet rolling blank rolling；（Three）, wide sheet rolling.The present invention adds shaping rolling before magnesium alloy wide-width thin plate rolling, and the shape of blank is rolled by change, excellent blank is provided for magnesium alloy wide-width thin plate rolling.Using the blank through the follow-up operation of rolling, while reducing magnesium alloy rolling side and split phenomenon and generate, the breadth of magnesium alloy sheet is increased, magnesium alloy wide-width thin plate is made preferably to meet the requirement used.

Description

Roll-casting of magnesium alloy plate prepares the process of wide sheet
Technical field
The invention belongs to roll-casting of magnesium alloy plates or casting volume Direct Rolling wide sheet technical field, specially magnesium alloy to cast Roll the process that plate prepares wide sheet.
Background technology
Magnesium alloy is structural metallic materials most light in current engineer application, it has also become national defense and military, aerospace, vapour The important materials of the industrial circles such as vehicle, electronic communication.With Larger Engineering Projects such as China's high-speed rail transportation, electric vehicles Start, higher requirement is proposed to big specification magnesium-alloy material.
Magnesium alloy wide-width thin plate says that routinely sheet metal can be divided into slab and thin plate from thickness angle, and thickness is not less than 6.0mm's is known as slab (plate), and thickness is more than 0.20mm but the title thin plate (sheet) less than 6.0mm.Certainly, to magnesium sheet material Also thickness can be known as thin plate less than 10mm.It is that cross section is according to GBPT5154-2003 planks (plate and sheet) Rectangle, thickness are more than the rolled products of 0.20mm together, and usual edge is handed over by shearing or sawing, and with flat shape Goods, thickness are no more than the 1/10 of width.Magnesium alloy sheet is rolled by magnesium alloy ingot, and the size of usual magnesium alloy ingot is：It is thick 127mm~305mm, wide 406mm~1041mm, long 914mm~2032mm, the ratio between magnesium alloy ingot width and thickness are preferably 4：1. The technique for being rolled into thin plate by magnesium alloy ingot for magnesium alloy at present is very ripe.
On the other hand, magnesium alloy wide-width thin plate is said from width angle, and Pohang Iron and Steel Corporation of South Korea (POSCO) has one in light sun A enterprise with two-roll casting magnesium plate band, referred to as PoStrip.It combines out with Britain Electron Magnesium Magnesium products are sent out, advanced international standard is in this field.2008, a plant-scale roll-casting of magnesium alloy factory was in Turkey's material Material research institute (TUBITAKMRC) is constructed and put into operation, they are using twin roll continuous casting technology production 6mm × (800~1500) mm's AZ31 magnesium alloy plates, slab product can be by continuous coiling or cutting on line into tablet.This is that hitherto reported production is most wide AZ31 cast-rolled blocks.In addition, the states such as Japan, Canada are also all producing magnesium alloy plate with double-roller rolling method (TRC methods).
The production of magnesium alloy plate mainly has following three kinds of methods：Double-roller rolling method (TRC methods), extrusion blooming rolling (ER methods) and slab hot-rolling cogging method (HR methods).Casting and roll process is low-cost magnesium alloy plank stuff production technology, but product quality is not so good as Rolling, and to realize that the casting of wide plate produces extremely difficult (width is generally in below 650mm)；Extrusion blooming method is main For producing thin plate, but the width of plank is restricted (generally in below 600mm)；Slab hot-rolling cogging method is that traditional magnesium closes Golden sheet production method can produce magnesium alloy wide-width thin plate, but this method yield rate is low, and production cost is high.Communications and transportation is led Domain uses magnesium alloy sheet specification to be generally 1.5~3.0mm of thickness, width>1600mm, length>4000mm is limited to casting Excessively high etc. reasons of, cost low with extrusion plate short of width and slab hot-rolling split rolling method lumber recovery, at present magnesium alloy plate Also not in the field scale application.
The development trend of the magnesium alloy plate and belt market demand and scale application is wide cut and cost effective.Wide cut is Magnesium alloy plate meets the primary condition of the traffic transport industries lightweight needs such as automobile, train, car, aircraft, this is depended on Wide plate production technology and the progress of equipment；Cost effective is the important item that magnesium alloy plate can be competed with other materials Part.Since temperature drop is fast when magnesium alloy sheet is processed, edge crack is serious, so how to solve side during magnesium alloy wide-width thin plate rolling The problem of portion cracks becomes the key for improving magnesium alloy wide-width thin plate rolling product qualification rate and production efficiency.
Invention content
The process of wide sheet is prepared it is an object of the invention to develop roll-casting of magnesium alloy plate, by Casting Rolled Sheet or casting At the beginning of volume directly prepares magnesium alloy wide-width thin plate, i.e., by shaping rolling mill practice, it is rolled into plate blank material intermediate thin, both sides thickness " dog bone " shape blank, solves the problems, such as edge crack during magnesium alloy wide-width thin plate rolling.
For achieving the above object, the technical scheme is that：
Roll-casting of magnesium alloy plate prepares the process of wide sheet, it is characterized in that：The rolling mill practice of magnesium alloy wide-width thin plate Include the following steps：(1), wide sheet rolling blank geomery is determining, during wide sheet rolling blank cross section includes Jian Bao areas, the thick area of intermediate thin area both sides setting, are connected, the sotck thinkness of transition region between thick area and intermediate thin area using transition region It is continuously reduced from thick area to intermediate thin area；(2), the rolling of wide sheet rolling blank；(3), wide sheet rolls.
The transition connection mode of transition region is connected for arc transition or straight transitions connection.
When the transition connection mode of transition region is connected for arc transition, rolling blank method for determining dimension includes following step Suddenly：
1), supplied materials thickness is H0, then intermediate thin area thickness be：
hb=H0(1-εb)；
2), supplied materials thickness is H0, Ze Hou areas thickness is：
hh=H0(1-εh)；
3) it is, to meet the flatness requirements of cross rolling back plate band, thick area is with intermediate thin area thickness difference：
Δhg=hh-hb=0.1~0.5mm；
4), in order to avoid after strip cross rolling edge residual stress change dramatically lead to local shape wave, take transition region
Width is：
lg=(100~400) Δ hg；
5), thick sector width gets the small value as far as possible in the range of material tracks and shearing equipment allows：
lh=10~15mm；
6), blank overall width to be prepared is l, then intermediate thin sector width is：
lb=l-2lh-2lg；
7), transition region curve uses arc transition, if the corresponding central angle of transition region circular arc is α, then has at this time：
Transition arc radius R, which can be obtained, is：
If arc transition curve is origin with intermediate thin area point of contact；X-axis is trunnion axis, and positive direction is directed toward the transition by thin area The adjacent thick area in area；Y-axis is vertical axis, and positive direction is directed toward the center of circle of transition arc perpendicular to blank surface；Then transition region circular arc Upper any point coordinate is (x, y), should be met：
(x-xc)2+(y-yc)2=R2；
The ordinate, which can be obtained, is：
Then the corresponding thickness of point is：
hg(x)=hb+2·y；
In formula, intermediate thin area reduction ratio εb=10~15%, thick area's reduction ratio εh=5~10%, H0For supplied materials thickness, l is Blank overall width, hbFor intermediate thin area thickness, hhFor thick area's thickness, Δ hgFor thick area and intermediate thin area thickness difference, lgFor transition region Width, lhFor thick sector width, lbFor intermediate thin sector width, α is the corresponding central angle of transition region circular arc, and R is transition arc radius, xc=0, yc=R.
When the transition connection mode of transition region is connected for straight transitions, rolling blank method for determining dimension includes following step Suddenly：
1), supplied materials thickness is H0, then intermediate thin area thickness be：
hb=H0(1-εb)；
2), supplied materials thickness is H0, Ze Hou areas thickness is：
hh=H0(1-εh)；
3) it is, to meet the flatness requirements of cross rolling back plate band, thick area must meet with intermediate thin area thickness difference：
Δhg=hh-hb=0.1~0.5mm；
4), in order to avoid after strip cross rolling edge residual stress change dramatically lead to local shape wave, take transition region wide It spends and is：
lg=(100~400) Δ hg；
5), thick sector width gets the small value as far as possible in the range of material tracks and shearing equipment allows：
lh=10~15mm；
6), blank overall width to be prepared is l, then intermediate thin sector width is：
lb=l-2lh-2lg；
7), transition region curve uses straight transitions, use the slope of transitional straight for：
K=(hh/2-hb/2)/lg；
If straight transitions curve is origin with intermediate thin area intersection point, since the straight line crosses origin, if transition region straight line is taken up an official post A bit
Coordinate is (x, y), should be met：
Y=kx, x ∈ [0, lg]；
Then the corresponding thickness of point is：
hg(x)=hb+2·y；
In formula, intermediate thin area reduction ratio εb=10~15%, thick area's reduction ratio εh=5~10%, H0For supplied materials thickness, l is Blank overall width, hbFor intermediate thin area thickness, hhFor thick area's thickness, Δ hgFor thick area and intermediate thin area thickness difference, lgFor transition region Width, lhFor thick sector width, lbFor intermediate thin sector width, k is the slope of transitional straight.
According to the geomery of determining rolling blank, the step of wide sheet rolls blank is directly prepared by Casting Rolled Sheet For：
1) it, rolls：Molten state magnesium alloy forms roll-casting of magnesium alloy slab after casting and rolling machine casting, and four are set after casting and rolling machine Roller mill rolls intermediate thin sector width and thickness, thick sector width and thickness and the input of the expression formula of width of transition zone and thickness Machine automatic gauge control system using the residual temperature of cast-rolled block, directly rolls cast-rolled block：To roll-casting of magnesium alloy plate edge Length direction, 1 percentage pass reduction of progress are εb=10~15% rolling forms intermediate thin area；Along rolling direction, intermediate thin area Front and rear sides carry out reduction ratio be εh=5~10% rolling forms thick area；Along rolling direction, the wide sheet rolled Rolling blank is that thick area rolls blank with the wide sheet that intermediate thin area continuously connects；
2), trimming：To preceding step 1) the continuous wide breadth thin plate rolling blank that obtains carries out trimming after rolling；
3), scale is segmented：To preceding step 2) rolling blank after trimming is from cutting section among thick area；
4), pile plate is spare：Wide sheet rolling blank stack plate after segmentation is spare.
According to the geomery of determining rolling blank, the step of wide sheet rolls blank is directly prepared by Casting Rolled Sheet For：
1), trimming：Molten state magnesium alloy forms cast-rolled block after casting and rolling machine casting, and cutter is set after casting and rolling machine, Trimming is carried out to Casting Rolled Sheet blank；
2), scale is segmented：Scale is carried out by the width of determining wide sheet rolling blank along rolling direction,
When it is arc transition to roll blank transition region, cut lengths L0For：
When it is straight transitions to roll blank transition region, cut lengths L0For：
L0=[2lh·hh+lb·hb+2·(hh+hb)·lg/2]/H0；
In formula, L0For cut lengths, lhFor thick sector width, hhFor thick area's thickness, lbFor intermediate thin sector width, lgFor transition region Width, hbFor intermediate thin area thickness, R is transition arc radius, H0For supplied materials thickness；
According to determining cut lengths L0, to preceding step 1) and the Casting Rolled Sheet blank that obtains after trimming is divided by cut lengths Section；
3), pile plate is spare：Casting Rolled Sheet hack plate after segmentation is spare；
4) it, rolls：By preceding step 3) prepare cast-rolled block carry out heating anneal, to after heating anneal cast-rolled block use Four-high mill is rolled：To roll-casting of magnesium alloy plate along its length, it is ε to carry out 1 percentage pass reductionb=10~15% rolls System forms intermediate thin area；Along rolling direction, the front and rear carry out reduction ratio in intermediate thin area is εh=5~10% rolling is formed thick Area, obtains wide sheet rolling blank, and pile plate is spare.
According to the geomery of determining rolling blank, the step of Direct Rolling wide sheet rolls blank is rolled up by casting For：
1), uncoiling is aligned：Uncoiling will be carried out in uncoiler after casting volume heating anneal, aligned through straightener；
2) it, rolls：Four-high mill is set after straightener, by intermediate thin sector width and thickness, thick sector width and thickness with And the expression formula of width of transition zone and thickness input AGC System of Rolling Mill, to the roll-casting of magnesium alloy slab after aligning into Row rolling：To roll-casting of magnesium alloy plate along its length, it is ε to carry out 1 percentage pass reductionb=10~15% rolling is formed intermediate Thin area；Along rolling direction, it is ε that the front and rear sides in intermediate thin area, which carry out reduction ratio,h=5~10% rolling forms thick area；It rolls on edge Direction processed, the wide sheet rolling blank rolled are that thick area rolls blank with the wide sheet that intermediate thin area continuously connects；
3), trimming：To preceding step 2) the continuous wide breadth thin plate rolling blank that obtains carries out trimming after rolling；
4), scale is segmented：To preceding step 3) rolling blank after trimming is from cutting section among thick area；
5), pile plate is spare：Wide sheet rolling blank stack plate after segmentation is spare.
According to the geomery of determining rolling blank, the step of Direct Rolling wide sheet rolls blank is rolled up by casting For：
1), uncoiling is aligned：Uncoiling will be carried out in uncoiler after casting volume heating anneal, aligned through straightener；
2), trimming：Cutter after straightener is set, trimming is carried out to the roll-casting of magnesium alloy plate after aligning；
3), scale is segmented：Scale is carried out by the width of determining wide sheet rolling blank along rolling direction,
When it is arc transition to roll blank transition region, cut lengths L0For：
When it is straight transitions to roll blank transition region, cut lengths L0For：
L0=[2lh·hh+lb·hb+2·(hh+hb)·lg/2]/H0；
In formula, L0For cut lengths, lhFor thick sector width, hhFor thick area's thickness, lbFor intermediate thin sector width, lgFor transition region Width, hbFor intermediate thin area thickness, R is transition arc radius, H0For supplied materials thickness；
According to determining cut lengths L0, to preceding step 2) and the Casting Rolled Sheet blank that obtains after trimming is divided by cut lengths Section；
4), pile plate is spare：Casting Rolled Sheet hack plate after segmentation is spare；
5) it, rolls：By preceding step 4) prepare cast-rolled block carry out heating anneal, to after heating anneal cast-rolled block use Four-high mill is rolled：To roll-casting of magnesium alloy plate along its length, it is ε to carry out 1 percentage pass reductionb=10~15% rolls System forms intermediate thin area；Along rolling direction, the front and rear carry out reduction ratio in intermediate thin area is εh=5~10% rolling is formed thick Area, obtains wide sheet rolling blank, and pile plate is spare.
The milling method of magnesium alloy wide-width thin plate is：After the spare rolling blank of pile plate is carried out heating anneal, open rolling temperature It is 380 DEG C~410 DEG C to spend, and finishing temperature is not less than 120 DEG C, and roller temperature is 120~200 DEG C, controls percentage pass reduction< 30%, final reduction rate<15%, through 3~9 passes to get to magnesium alloy wide-width thin plate.
The roll-casting of magnesium alloy width of plate slab is 600~1200mm, and thickness is 6.0~8.0mm；The magnesium alloy is wide Width lamella thickness is 1.0~3.0mm, and width is 1200~2000mm.
The present invention has the advantages that compared with the prior art.
1st, the advantages of easement curve of transition region is arc transition：Arc transition curve combines smaller length of transition zone, Transition region and thick area's cohesive position thickness change rate can be made very fast, suitable for side split relatively more serious, thickness for 1.0~ Product between 1.5mm, in cross rolling, it is larger to bear compression for its edge.
2nd, the advantages of easement curve of transition region is straight transitions：Straight transitions curve combines larger width of transition zone, Can make entire transition region using identical thickness change rate, suitable for side split relatively light, thickness for 1.5~3.0mm it Between product, in cross rolling, it is smaller to bear compression for its edge.
3rd, the present invention provides excellent blank for roll-casting of magnesium alloy plate Direct Rolling magnesium alloy wide-width thin plate, is follow-up lateral Rolling provides a strong guarantee, and ratio is split on side when reducing cross rolling, improves lumber recovery.
Description of the drawings
Fig. 1, which is transition region, rolls blank cross-sectional view when being circular sliding slopes.
Fig. 2 is the rolling blank vertical view that arc transition connection connect two kinds of transition connection modes with straight transitions.
Fig. 3 is that transition region is that straight line rolls blank cross-sectional view when connecting.
Fig. 4 is the shaping rolling process schematic diagram that embodiment one prepares magnesium alloy wide-width thin plate rolling blank.
Fig. 5 is the shaping rolling process schematic diagram that embodiment two prepares magnesium alloy wide-width thin plate rolling blank.
Fig. 6 is the shaping rolling process schematic diagram that embodiment three prepares magnesium alloy wide-width thin plate rolling blank.
Fig. 7 is the shaping rolling process schematic diagram that example IV prepares magnesium alloy wide-width thin plate rolling blank.
In figure, I, I ' is thick area, and II, II ' is transition region, and III is intermediate thin area, and 1 is bast mouth, and 2 be casting and rolling machine, and 3 be casting Plate, 4 be hydraulic cylinder, and 5 be milling train, and 6 be cutter, and 7 be sheet piler platform, and 8 be uncoiler, and 9 be straightener.
Specific embodiment
The present invention may be better understood, but this example is not intended to limit the present invention by following embodiments.
Embodiment one：
Choose rolling kind be AZ31, supplied materials width be 600mm, supplied materials thickness be 6.0mm, magnesium alloy wide-width light sheet products Thickness 1.5mm, width l are 1600mm.
As shown in Fig. 1~2, roll-casting of magnesium alloy plate prepares the process of wide sheet, it is characterized in that：Magnesium alloy wide-width is thin The rolling mill practice of plate includes the following steps：
(1), wide sheet rolling blank geomery is determining, and wide sheet rolling blank cross section includes intermediate thin Area, the intermediate thin area both sides thick area of setting, is connected between thick area and intermediate thin area using transition region, and the sotck thinkness of transition region is from thickness Area is continuously reduced to intermediate thin area.
The intermediate thin area reduction ratio ε of the present embodiment blankbIt is for 15%, Ze Zhahou intermediate thins area thickness：hb=5.1mm；It is thick Area reduction ratio εh10%, the Ze Zhahouhou areas thickness is taken to be：hh=5.4mm；Thick sector width is：lh=10mm；Width of transition zone is： lg=200 Δ hg=200 × 0.3=60mm.
Intermediate thin sector width is：lb=l-2lh-2lg=1600-2 × 10-2 × 60=1460mm.
Transition region easement curve presses circular arc type form transition, as shown in Fig. 1~2, if α is corresponding for transition region transition arc Central angle then has at this time：
Transition arc radius, which can be obtained, is：
If arc transition curve is origin with intermediate thin area point of contact；X-axis is trunnion axis, and positive direction is directed toward the transition by thin area The adjacent thick area in area；Y-axis is vertical axis, and positive direction is directed toward the center of circle of transition arc perpendicular to blank surface；Then transition region circular arc Upper any point coordinate is (x, y), should be met：
(x-xc)2+(y-yc)2=R2；
Wherein, xc=0, yc=R；
The ordinate, which can be obtained, is：
Then the corresponding thickness of point is：
hg(x)=hb+2·y；
The geomery of magnesium alloy wide-width thin plate rolling blank determines.
(2), the rolling of wide sheet rolling blank
As shown in Figure 4：
1) it, rolls：Molten state magnesium alloy forms roll-casting of magnesium alloy slab after casting and rolling machine casting, and four are set after casting and rolling machine Roller mill rolls intermediate thin sector width and thickness, thick sector width and thickness and the input of the expression formula of width of transition zone and thickness Machine automatic gauge control system using the residual temperature of cast-rolled block, directly rolls cast-rolled block：To roll-casting of magnesium alloy plate edge Length direction, 1 percentage pass reduction of progress are εb=15% rolling forms intermediate thin area；Along rolling direction, before intermediate thin area It is ε that both sides, which carry out reduction ratio, afterwardsh=10% rolling forms thick area；Along rolling direction, the wide sheet rolled rolls plate blank material The wide sheet continuously to connect for thick area and intermediate thin area rolls blank；
2), trimming：To preceding step 1) the continuous wide breadth thin plate rolling blank that obtains carries out trimming after rolling, take continuous rolling base It is unilateral 20mm to expect trimming amount, then continuous rolling blank width is 560mm；
3), scale is segmented：To preceding step 2) from cutting section among thick area, specific method is for rolling blank after trimming：Position It puts and cutting to length segmentation is carried out to blank when accurate tracking system tracks to thick sector width as at 10mm, obtain thin sector width lbFor 1460mm, thick sector width lhFor 10mm, width of transition zone lgFor 60mm, the wide sheet that blank section overall width l is 1600mm rolls Plate blank material；
4), pile plate is spare：Wide sheet rolling blank stack plate after segmentation is spare.
(3), wide sheet rolls
By preceding step (two) pile plate it is spare roll plate blank material carry out heating anneal after, utilize four-roller or six roller temperature cold-rolling mills pair Intermediate thin area thickness is hb=5.1mm, thick area's thickness are hh=5.4mm, blank width 1600mm, charge length are 560mm's Magnesium alloy slab is rolled, and start rolling temperature is 380 DEG C, and 120 DEG C of finishing temperature, roller temperature is 120 DEG C, through 3 passes, Percentage pass reduction ＜ 30%, final reduction rate ＜ 15% are controlled, obtains thickness as 1.5mm, width is the magnesium alloy of 1600mm Wide sheet.
Embodiment two：
Selection rolling kind is AZ31, and supplied materials width is 1000mm, and supplied materials thickness is 8.0mm, and magnesium alloy wide-width thin plate produces Product thickness 1.0mm, width 2000mm.
As shown in figures 2-3, wide sheet rolling blank transverse shape includes intermediate thin area, the setting of intermediate thin area both sides Thick area, is connected between thick area and intermediate thin area using transition region, and the sotck thinkness of transition region continuously subtracts from thick area to intermediate thin area It is small.The transition connection mode of two transition region of the present embodiment is connected for straight transitions.
The operation of rolling of magnesium alloy wide-width thin plate is carried out successively using following steps：
(1), rolling blank geomery is determining
The intermediate thin area reduction ratio ε of two blank of the present embodimentbIt is for 10%, Ze Zhahou intermediate thins area thickness：hb=7.2mm； Thick area's reduction ratio εh7.5%, the Ze Zhahouhou areas thickness is taken to be：hh=7.4mm；Thick sector width is：lh=15mm；Width of transition zone For：lg=300 Δ hg=300 × 0.2=60mm.
Intermediate thin sector width is lb=l-2lh-2lg=2000-2 × 15-2 × 60=1850mm.
As shown in figures 2-3, transition region easement curve be straight line, length of transition zone lgFor 60mm, thick area and intermediate thin area thickness Degree difference is 0.2mm, then the slope of used transitional straight is：
K=(hh/2-hb/2)/lg=0.1/60=1/600；
Since the straight line crosses origin, if any point coordinate is (x, y) on transition region straight line, should meet：
Y=kx=1/600x, x ∈ [0,60]；
Then the corresponding thickness of point is：
hg(x)=hb+2·y；
The geomery for rolling blank determines.
(2), wide sheet rolling blank rolling
As shown in Figure 5：
1), trimming：Molten state magnesium alloy forms cast-rolled block after casting and rolling machine casting, and cutter is set after casting and rolling machine, Trimming is carried out to Casting Rolled Sheet blank for 20mm by unilateral trimming amount；
2), scale is segmented：To preceding step 1) the Casting Rolled Sheet blank that obtains after trimming along rolling direction by determining wide sheet The width for rolling blank carries out scale, cut lengths L0For：
L0=[2lh·hh+lb·hb+2·(hh+hb)·lg/2]/H0=1802.25mm
After scale obtain thickness be 8.0mm, width 960mm, length be 1802.25mm slab；
3), pile plate is spare：Casting Rolled Sheet hack plate after segmentation is spare；
4) it, rolls：By preceding step 3) prepare cast-rolled block carry out heating anneal, to after heating anneal cast-rolled block use Four-roller or six roller temperature cold-rolling mills are rolled：To roll-casting of magnesium alloy plate along its length, it is ε to carry out 1 percentage pass reductionb= 10% rolling forms intermediate thin area；Along rolling direction, it is ε that the front and rear sides in intermediate thin area, which carry out reduction ratio,h=7.5% Rolling forms thick area；It rolls plate blank material cross section and includes intermediate thin area, the thick area of intermediate thin area both sides setting, thick area and intermediate thin area Between connected using transition region, the sotck thinkness of transition region is continuously reduced from thick area to intermediate thin area；Obtain thin sector width lbFor 1850mm, thick sector width lhFor 15mm, width of transition zone lgFor 60mm, the wide sheet that blank section overall width l is 2000mm rolls Base material, pile plate are spare.
(3), wide sheet rolls
After the spare rolling blank of preceding step (two) pile plate is carried out heating anneal, the roller temperature cold-rolling mill centering of four-roller/six is utilized Jian Bao areas thickness is hb=7.2mm, thick area's thickness are hh=7.4mm, blank width 2000mm, charge length are the magnesium of 960mm Alloy slab, which is rotated by 90 °, to be rolled, and start rolling temperature is 390 DEG C, and 150 DEG C of finishing temperature, roller temperature is 160 DEG C, through 6 Secondary rolling controls percentage pass reduction ＜ 30%, final reduction rate ＜ 15%, obtains thickness as 1.0mm, and width is 2000mm's Magnesium alloy wide-width thin plate.
Embodiment three
Choose rolling kind be AZ31, supplied materials width be 600mm, supplied materials thickness be 6.0mm, magnesium alloy wide-width light sheet products Thickness 1.5mm, width l are 1600mm.
As shown in Fig. 1~2, wide sheet rolling blank transverse shape includes intermediate thin area, the setting of intermediate thin area both sides Thick area, is connected between thick area and intermediate thin area using transition region, and the sotck thinkness of transition region continuously subtracts from thick area to intermediate thin area It is small.The transition connection mode of three transition region of the present embodiment is connected for arc transition.
The operation of rolling of magnesium alloy wide-width thin plate is carried out successively using following steps：
(1), rolling blank geomery is determining
The present embodiment three rolls blank intermediate thin area reduction ratio εbIt is for 15%, Ze Zhahou intermediate thins area thickness：hb= 5.1mm；Thick area's reduction ratio εh10%, the Ze Zhahouhou areas thickness is taken to be：hh=5.4mm；Thick sector width is：lh=10mm；Transition region Width is：lg=200 Δ hg=200 × 0.3=60mm.
Intermediate thin sector width is：lb=l-2lh-2lg=1600-2 × 10-2 × 60=1460mm.
Transition region easement curve presses circular arc type form transition, as shown in Fig. 1~2, if α is corresponding for transition region transition arc Central angle then has at this time：
Transition arc radius, which can be obtained, is：
If any point coordinate is (x, y) on transition region circular arc, should meet：
(x-xc)2+(y-yc)2=R2；
Wherein, xc=0, yc=R；
The ordinate, which can be obtained, is：
Then the corresponding thickness of point is：
hg(x)=hb+2·y；
The geomery of magnesium alloy wide-width thin plate rolling blank determines.
(2), the rolling of wide sheet rolling blank
As shown in Figure 6：
1) it, aligns：Uncoiling will be carried out in uncoiler after casting volume heating anneal, aligned through straightener；
2), trimming：Cast-rolled block after aligning carries out trimming for 20mm by unilateral trimming amount to Casting Rolled Sheet blank；
3), scale is segmented：To preceding step 2) the Casting Rolled Sheet blank that obtains after trimming along rolling direction by determining wide sheet The width for rolling blank carries out scale, blank transition region is rolled in the present embodiment three as arc transition, cut lengths L0For：
In formula, L0For cut lengths, lhFor thick sector width, hhFor thick area's thickness, lbFor intermediate thin sector width, lgFor transition region Width, hbFor intermediate thin area thickness, R is transition arc radius, H0For supplied materials thickness；
According to determining cut lengths L0, to preceding step 2) and the Casting Rolled Sheet blank that obtains after trimming is divided by cut lengths Section.After scale obtain thickness be 6mm, width 540mm, length be 1596.03mm slab；
4), pile plate is spare：Casting Rolled Sheet hack plate after segmentation is spare；
5) it, rolls：Roll-casting of magnesium alloy slab is formed after aligning and is delivered to four-high mill, by intermediate thin sector width and thickness, Thick sector width and the expression formula of thickness and width of transition zone and thickness input AGC System of Rolling Mill, utilize Casting Rolled Sheet The residual temperature of base, directly rolls cast-rolled block：To roll-casting of magnesium alloy plate along its length, it is ε to carry out 1 percentage pass reductionb =15% rolling forms intermediate thin area；Along rolling direction, it is ε that the front and rear sides in intermediate thin area, which carry out reduction ratio,h=10% Rolling forms thick area.Thin sector width l is obtained after rollingbFor 1460mm, thick sector width lhFor 10mm, width of transition zone lgFor The wide sheet that 60mm, blank section overall width l are 1600mm rolls blank, and pile plate is spare.
(3), wide sheet rolls
By preceding step (two) pile plate it is spare roll plate blank material carry out heating anneal after, utilize four-roller or six roller temperature cold-rolling mills pair Intermediate thin area thickness is hb=5.1mm, thick area's thickness are hh=5.7mm, blank width 1600mm, charge length are 560mm's Magnesium alloy slab is rolled, and start rolling temperature is 380 DEG C, and 120 DEG C of finishing temperature, roller temperature is 120 DEG C, through 3 passes, Percentage pass reduction ＜ 30%, final reduction rate ＜ 15% are controlled, obtains thickness as 1.5mm, width is the magnesium alloy of 1600mm Wide sheet.
Example IV
Selection rolling kind is AZ31, and supplied materials width is 1000mm, and supplied materials thickness is 8.0mm, and magnesium alloy wide-width thin plate produces Product thickness 1.0mm, width 2000mm.
As shown in figures 2-3, wide sheet rolling blank transverse shape includes intermediate thin area, the setting of intermediate thin area both sides Thick area, is connected between thick area and intermediate thin area using transition region, and the sotck thinkness of transition region continuously subtracts from thick area to intermediate thin area It is small.The transition connection mode of four transition region of the present embodiment is connected for straight transitions.
The operation of rolling of magnesium alloy wide-width thin plate is carried out successively using following steps：
(1), rolling blank geomery is determining
The intermediate thin area reduction ratio ε of four blank of the present embodimentbIt is for 10%, Ze Zhahou intermediate thins area thickness：hb=7.2mm； Thick area's reduction ratio εh7.5%, the Ze Zhahouhou areas thickness is taken to be：hh=7.4mm；Thick sector width is：lh=15mm；Width of transition zone For：lg=300 Δ hg=300 × 0.2=60mm.
Intermediate thin sector width is lb=l-2lh-2lg=2000-2 × 15-2 × 60=1850mm：.
As shown in figures 2-3, transition region easement curve be straight line, length of transition zone lgFor 60mm, thick area and intermediate thin area thickness Degree difference is 0.2mm, then the slope of used transitional straight is：
K=(hh/2-hb/2)/lg=0.1/60=1/600；
Since the straight line crosses origin, if any point coordinate is (x, y) on transition region straight line, should meet：
Y=kx=1/600x, x ∈ [0,60]；
Then the corresponding thickness of point is：
hg(x)=hb+2·y；
The geomery for rolling blank determines.
(2), wide sheet rolling blank rolling
As shown in Figure 7：
1) it, aligns：Uncoiling will be carried out in uncoiler after casting volume heating anneal, aligned through straightener；
2) it, rolls：Four-high mill is set after straightener, the roll-casting of magnesium alloy slab after aligning is delivered to four-high mill, By intermediate thin sector width and thickness, thick sector width and thickness and the expression formula of width of transition zone and thickness input milling train thickness certainly Autocontrol system rolls cast-rolled block：To roll-casting of magnesium alloy plate along its length, it is ε to carry out 1 percentage pass reductionb= 10% rolling forms intermediate thin area；Along rolling direction, it is ε that the front and rear sides in intermediate thin area, which carry out reduction ratio,h=7.5% Rolling forms thick area；Along rolling direction, it is the width that thick area continuously connects with intermediate thin area that the wide sheet rolled, which rolls plate blank material, Width thin plate rolling blank；
3), trimming：To preceding step 2) the continuous wide breadth thin plate rolling blank that obtains carries out trimming after rolling, take continuous rolling base It is unilateral 20mm to expect trimming amount, then continuous rolling blank width is 960mm；
4), scale is segmented：To preceding step 3) from cutting section among thick area, specific method is for rolling blank after trimming：Position It puts and cutting to length segmentation is carried out to blank when accurate tracking system tracks to thick sector width as at 15mm, obtain thin sector width lbFor 1850mm, thick sector width lhFor 15mm, width of transition zone lgFor 60mm, the wide sheet that blank section overall width l is 2000mm rolls Plate blank material；
5), pile plate is spare：Wide sheet rolling blank stack plate after segmentation is spare.
(3), wide sheet rolls
After the spare rolling blank of preceding step (two) pile plate is carried out heating anneal, the roller temperature cold-rolling mill centering of four-roller/six is utilized Jian Bao areas thickness is hb=7.2mm, thick area's thickness are hh=7.4mm, blank width 2000mm, charge length are the magnesium of 960mm Alloy slab, which is rotated by 90 °, to be rolled, and start rolling temperature is 390 DEG C, and 150 DEG C of finishing temperature, roller temperature is 160 DEG C, through 6 Secondary rolling controls percentage pass reduction ＜ 30%, final reduction rate ＜ 15%, obtains thickness as 1.0mm, and width is 2000mm's Magnesium alloy wide-width thin plate.
The embodiment of the present invention is explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations Example, within the knowledge of a person skilled in the art, can also make under the premise of present inventive concept is not departed from Go out various change.

Claims (10)

1. roll-casting of magnesium alloy plate prepares the process of wide sheet, it is characterized in that：The rolling mill practice packet of magnesium alloy wide-width thin plate Include following steps：(1), wide sheet rolling blank geomery is determining, and wide sheet rolling blank cross section includes centre Thin area, the intermediate thin area both sides thick area of setting, is connected between thick area and intermediate thin area using transition region, the sotck thinkness of transition region from Thick area is continuously reduced to intermediate thin area；(2), the rolling of wide sheet rolling blank；(3), wide sheet rolls.
2. roll-casting of magnesium alloy plate according to claim 1 prepares the process of wide sheet, it is characterized in that：Transition region Transition connection mode is connected for arc transition or straight transitions connection.
3. roll-casting of magnesium alloy plate according to claim 2 prepares the process of wide sheet, it is characterized in that：Transition region When transition connection mode is connected for arc transition, rolling blank method for determining dimension includes the following steps：
1), supplied materials thickness is H0, then intermediate thin area thickness be：
hb=H0(1-εb)；
2), supplied materials thickness is H0, Ze Hou areas thickness is：
hh=H0(1-εh)；
3) it is, to meet the flatness requirements of cross rolling back plate band, thick area is with intermediate thin area thickness difference：
Δhg=hh-hb=0.1~0.5mm；
4), in order to avoid after strip cross rolling edge residual stress change dramatically lead to local shape wave, take the width of transition zone to be：
lg=(100~400) Δ hg；
5), thick sector width gets the small value as far as possible in the range of material tracks and shearing equipment allows：
lh=10~15mm；
6), blank overall width to be prepared is l, then intermediate thin sector width is：
lb=l-2lh-2lg；
7), transition region curve uses arc transition, if the corresponding central angle of transition region circular arc is α, then has at this time：
Transition arc radius R, which can be obtained, is：
If arc transition curve is origin with intermediate thin area point of contact；X-axis is trunnion axis, and positive direction is directed toward the transition region by thin area Adjacent thickness area；Y-axis is vertical axis, and positive direction is directed toward the center of circle of transition arc perpendicular to blank surface；Then transition region circular arc is taken up an official post One point coordinates is (x, y), should be met：
(x-xc)2+(y-yc)2=R2；
The ordinate, which can be obtained, is：
Then the corresponding thickness of point is：
hg(x)=hb+2·y；
In formula, intermediate thin area reduction ratio εb=10~15%, thick area's reduction ratio εh=5~10%, H0For supplied materials thickness, l is blank Overall width, hbFor intermediate thin area thickness, hhFor thick area's thickness, Δ hgFor thick area and intermediate thin area thickness difference, lgIt is wide for transition region Degree, lhFor thick sector width, lbFor intermediate thin sector width, α is the corresponding central angle of transition region circular arc, and R is transition arc radius, xc =0, yc=R.
4. roll-casting of magnesium alloy plate according to claim 2 prepares the process of wide sheet, it is characterized in that：Transition region When transition connection mode is connected for straight transitions, rolling blank method for determining dimension includes the following steps：
1), supplied materials thickness is H0, then intermediate thin area thickness be：
hb=H0(1-εb)；
2), supplied materials thickness is H0, Ze Hou areas thickness is：
hh=H0(1-εh)；
3) it is, to meet the flatness requirements of cross rolling back plate band, thick area must meet with intermediate thin area thickness difference：
Δhg=hh-hb=0.1~0.5mm；
4), in order to avoid after strip cross rolling edge residual stress change dramatically lead to local shape wave, take the width of transition zone to be：
lg=(100~400) Δ hg；
5), thick sector width gets the small value as far as possible in the range of material tracks and shearing equipment allows：
lh=10~15mm；
6), blank overall width to be prepared is l, then intermediate thin sector width is：
lb=l-2lh-2lg；
7), transition region curve uses straight transitions, use the slope of transitional straight for：
K=(hh/2-hb/2)/lg；
If straight transitions curve is origin with intermediate thin area intersection point, since the straight line crosses origin, if any point on transition region straight line Coordinate is (x, y), should be met：
Y=kx, x ∈ [0, lg]；
Then the corresponding thickness of point is：
hg(x)=hb+2·y；
In formula, intermediate thin area reduction ratio εb=10~15%, thick area's reduction ratio εh=5~10%, H0For supplied materials thickness, l is blank Overall width, hbFor intermediate thin area thickness, hhFor thick area's thickness, Δ hgFor thick area and intermediate thin area thickness difference, lgIt is wide for transition region Degree, lhFor thick sector width, lbFor intermediate thin sector width, k is the slope of transitional straight.
5. the process of wide sheet is prepared according to any roll-casting of magnesium alloy plate of Claims 1 to 4, it is characterized in that： According to the geomery of determining rolling blank, the step of wide sheet rolls blank is directly prepared by Casting Rolled Sheet is：
1) it, rolls：Molten state magnesium alloy forms roll-casting of magnesium alloy slab after casting and rolling machine casting, and four rollings are set after casting and rolling machine Machine is thick by intermediate thin sector width and thickness, thick sector width and thickness and the expression formula of width of transition zone and thickness input milling train Automatic control system is spent, using the residual temperature of cast-rolled block, directly cast-rolled block is rolled：To roll-casting of magnesium alloy plate along length Direction, 1 percentage pass reduction of progress are εb=10~15% rolling forms intermediate thin area；Along rolling direction, before intermediate thin area It is ε that both sides, which carry out reduction ratio, afterwardsh=5~10% rolling forms thick area；Along rolling direction, the wide sheet rolling rolled Blank is that thick area rolls blank with the wide sheet that intermediate thin area continuously connects；
2), trimming：To preceding step 1) the continuous wide breadth thin plate rolling blank that obtains carries out trimming after rolling；
3), scale is segmented：To preceding step 2) rolling blank after trimming is from cutting section among thick area；
4), pile plate is spare：Wide sheet rolling blank stack plate after segmentation is spare.
6. the process of wide sheet is prepared according to any roll-casting of magnesium alloy plate of Claims 1 to 4, it is characterized in that： According to the geomery of determining rolling blank, the step of wide sheet rolls blank is directly prepared by Casting Rolled Sheet is：
1), trimming：Molten state magnesium alloy forms cast-rolled block after casting and rolling machine casting, and cutter is set after casting and rolling machine, to casting It rolls plate blank material and carries out trimming；
2), scale is segmented：Scale is carried out by the width of determining wide sheet rolling blank along rolling direction,
When it is arc transition to roll blank transition region, cut lengths L0For：
When it is straight transitions to roll blank transition region, cut lengths L0For：
L0=[2lh·hh+lb·hb+2·(hh+hb)·lg/2]/H0；
In formula, L0For cut lengths, lhFor thick sector width, hhFor thick area's thickness, lbFor intermediate thin sector width, lgIt is wide for transition region Degree, hbFor intermediate thin area thickness, R is transition arc radius, H0For supplied materials thickness；
According to determining cut lengths L0, to preceding step 1) and the Casting Rolled Sheet blank that obtains after trimming is divided into section by cut lengths；
3), pile plate is spare：Casting Rolled Sheet hack plate after segmentation is spare；
4) it, rolls：By preceding step 3) prepare cast-rolled block carry out heating anneal, to the cast-rolled block after heating anneal use four-roller Milling train is rolled：To roll-casting of magnesium alloy plate along its length, it is ε to carry out 1 percentage pass reductionb=10~15% rolling, shape Into intermediate thin area；Along rolling direction, the front and rear carry out reduction ratio in intermediate thin area is εh=5~10% rolling forms thick area, obtains Blank is rolled to wide sheet, pile plate is spare.
7. roll-casting of magnesium alloy plate according to claim 5 prepares the process of wide sheet, it is characterized in that：According to determining Rolling blank geomery, be by the step of casting volume Direct Rolling wide sheet rolling blank：
1), uncoiling is aligned：Uncoiling will be carried out in uncoiler after casting volume heating anneal, aligned through straightener；
2) it, rolls：Four-high mill is set after straightener, by intermediate thin sector width and thickness, thick sector width and thickness and mistake The expression formula input AGC System of Rolling Mill of sector width and thickness is crossed, the roll-casting of magnesium alloy slab after aligning is rolled System：To roll-casting of magnesium alloy plate along its length, it is ε to carry out 1 percentage pass reductionb=10~15% rolling forms intermediate thin area； Along rolling direction, it is ε that the front and rear sides in intermediate thin area, which carry out reduction ratio,h=5~10% rolling forms thick area；Along rolling side To the wide sheet rolling blank rolled is that thick area rolls blank with the wide sheet that intermediate thin area continuously connects；
3), trimming：To preceding step 2) the continuous wide breadth thin plate rolling blank that obtains carries out trimming after rolling；
4), scale is segmented：To preceding step 3) rolling blank after trimming is from cutting section among thick area；
5), pile plate is spare：Wide sheet rolling blank stack plate after segmentation is spare.
8. roll-casting of magnesium alloy plate according to claim 6 prepares the process of wide sheet, it is characterized in that：According to determining Rolling blank geomery, be by the step of casting volume Direct Rolling wide sheet rolling blank：
1), uncoiling is aligned：Uncoiling will be carried out in uncoiler after casting volume heating anneal, aligned through straightener；
2), trimming：Cutter after straightener is set, trimming is carried out to the roll-casting of magnesium alloy plate after aligning；
3), scale is segmented：Scale is carried out by the width of determining wide sheet rolling blank along rolling direction,
When it is arc transition to roll blank transition region, cut lengths L0For：
When it is straight transitions to roll blank transition region, cut lengths L0For：
L0=[2lh·hh+lb·hb+2·(hh+hb)·lg/2]/H0；
In formula, L0For cut lengths, lhFor thick sector width, hhFor thick area's thickness, lbFor intermediate thin sector width, lgIt is wide for transition region Degree, hbFor intermediate thin area thickness, R is transition arc radius, H0For supplied materials thickness；
According to determining cut lengths L0, to preceding step 2) and the Casting Rolled Sheet blank that obtains after trimming is divided into section by cut lengths；
4), pile plate is spare：Casting Rolled Sheet hack plate after segmentation is spare；
5) it, rolls：By preceding step 4) prepare cast-rolled block carry out heating anneal, to the cast-rolled block after heating anneal use four-roller Milling train is rolled：To roll-casting of magnesium alloy plate along its length, it is ε to carry out 1 percentage pass reductionb=10~15% rolling, shape Into intermediate thin area；Along rolling direction, the front and rear carry out reduction ratio in intermediate thin area is εh=5~10% rolling forms thick area, obtains Blank is rolled to wide sheet, pile plate is spare.
9. roll-casting of magnesium alloy plate according to claim 7 or 8 prepares the process of wide sheet, it is characterized in that：Magnesium closes The milling method of golden wide sheet is：After the spare rolling blank of pile plate is carried out heating anneal, start rolling temperature for 380 DEG C~ 410 DEG C, finishing temperature is not less than 120 DEG C, and roller temperature is 120~200 DEG C, controls percentage pass reduction<30%, extreme trace time pressure Rate<15%, through 3~9 passes to get to magnesium alloy wide-width thin plate.
10. roll-casting of magnesium alloy plate according to claim 9 prepares the process of wide sheet, it is characterized in that：Described Roll-casting of magnesium alloy width of plate slab is 600~1200mm, and thickness is 6.0~8.0mm；The magnesium alloy wide-width lamella thickness is 1.0~3.0mm, width are 1200~2000mm.
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