CN105983665A - Narrow-edge copper plate for slab mold with continuous variable taper at corner - Google Patents
Narrow-edge copper plate for slab mold with continuous variable taper at corner Download PDFInfo
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- CN105983665A CN105983665A CN201510090728.2A CN201510090728A CN105983665A CN 105983665 A CN105983665 A CN 105983665A CN 201510090728 A CN201510090728 A CN 201510090728A CN 105983665 A CN105983665 A CN 105983665A
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Abstract
The invention discloses a narrow-edge copper plate for a slab mold with a continuous variable taper at the corner, relates to machinery or equipment in metal continuous casting and in particular to a manufacturing or casting mold plate for a bottom opening mold for metal continuous casting. An upper mouth profile curve of the narrow-edge copper plate is formed by connection of an upper mouth straight line, a funnel curve, an upper mouth oblique line and an upper mouth arc; the funnel curve is continuous with an oblique line curvature; the two ends of the upper mouth arc are tangent to the upper mouth oblique line and the upper mouth straight line respectively; the taper of a chamber part of the narrow-edge copper plate of the slab mold is continuously decreased in the height direction of the slab mold progressively; the progressive decrease speed of the taper is gradually slow; and the length of the profile of the horizontal cross section of the narrow-edge copper plate of the slab mold continuously varies downwards in the height direction of an upper mouth of the slab mold so as to form a corner funnel region with a funnel-shaped curve with the taper to be decreased progressively and shrink. According to the narrow-edge copper plate, local stress concentration generated in the movement deformation and shrinkage process of a billet shell can be prevented, the narrow-edge copper plate is suitable for differences of solidification shrinkage coefficients of different kinds of steel, and the application range of the kind of the steel is enlarged.
Description
Technical field
The present invention relates to machinery or the equipment of continuous casting of metal, the bottom opening particularly for continuous casting of metal is cast
The manufacture of mould or mold plate.
Background technology
Plate slab crystallizer is " heart " of the very important parts of conticaster, referred to as continuous casting installation for casting.The basic knot of crystallizer
Structure is the bottomless ingot mould of a Forced water cooling, by two relative broadside copper coin (the widest face copper coin) and two opposite, narrow limits
Copper coin (also referred to as narrow copper plate) assembles and constitutes, and its effect is: (1) is under the highest pulling rate, it is ensured that go out crystallization
Device shell thickness, by the vibration of crystallizer, makes green shell depart from crystallizer wall and not be pulled off and bleed-out.(2) ensure
The generation that green shell is uniform and stable.(3) molten steel is made to be progressively solidified into the green shell of required specification, shape；Molten steel is at crystallizer
In solidification behavior normal production of cc billet surface quality and casting machine is had significant impact.
Angle, four, the working cavities square-section of conventional continuous cast mold is right angle, affects continuous casting billet quality and follow-up
Hot rolling processing characteristics, there is problems in that
1, being Two-Dimensional Heat due to crystallizer right angle portions, molten steel solidifies in crystallizer, and originally corner cooling is the fastest,
Early shrinking and formed air gap, corner departs from and the contacting of crystallizer inwall, and cools down the most slack-off, causes folding corner region green shell
Thin, the most easily go out the bleed-out at crystallizer end opening.
2, after slab goes out crystallizer, secondary cooling zone, owing to strand corner is Two-Dimensional Heat, corner surface temperature ratio are entered
Normal casting blank surface temperature is low 70～200 degree, and when producing micro alloyed steel, corner temperature cannot avoid the 3rd brittle zone,
Thus the problem causing strand angle transverse fissure.
3, the continuous casting covering slag of crystallizer corner portion can make to flow between copper coin and green shell deficiency, and lubricant effect is poor, therefore holds
Easily cause cc billet surface quality defect and bleed-out.
4, cross section four limit be the rectangular slab at right angle when Vertical Rolling adjusts width rolling, owing to adjusting wide drafts and slab width
Degree is compared and is seemed the least, deforms the impermeable central part to width of plate slab, only produces the areal deformation of slab side,
Make roughing intermediate blank edge that more sharp-pointed projection (dog bone shape section) to occur, bossing under the effect of cooling water,
Temperature reduces rapidly, enters high temperature inductile district, local laceration occurs during flat rolling subsequently, shows as hot rolling
Surface, edges of boards portion stick up skin defect.
There is disadvantages mentioned above for right angle crystallizer, existing mould at narrow copper coin frequently with the structure of side straps chamfering,
Mould at narrow copper coin chamfering structure typically uses two kinds of forms: the first form is folder in the middle of mould at narrow and wide face
Hold independent chamfering parts；Owing to independent chamfering parts are dependent on the contact cooling with copper coin, its chamfering the most all than
Less, generally 5～10mm, chamfering all makes plane oblique angle, unanimous between the higher and lower levels 45 °.Additionally, independent chamfering parts
Service life is the lowest.The second form is each side to make one at mould at narrow copper coin to be linked as with narrow limit copper coin
The side chamfering of one.Chinese utility model patent " slab continuous-casting crystallizer narrow-strop copper plate " (utility model patent number:
ZL02214026.3, Authorization Notice No.: CN2547438Y) disclose the mould at narrow copper coin of a kind of band side chamfering,
Its work surface both sides are designed with the triangle of protrusion, form a size of 6～10mm, and angle is the chamfering of 45 degree, strand
Four right angles become 8 obtuse angles.Chinese utility model patent " a kind of plate slab crystallizer " (utility model patent number:
ZL200720089029.7, Authorization Notice No.: CN201132207Y) disclose a kind of plate slab crystallizer, its narrow limit copper coin
With the curved surface of oriented broadside copper coin internal wall transitions, this fillet surface is arc surface, and the radius of circular arc chamfering is 2～10mm, because of
This its chamfering amount is less than 10mm.The shortcoming of technique scheme is that chamfering amount is little, and the lifting amplitude of strand corner temperature is little,
To solving strand transverse crack limited use.
(utility model patent number: ZL200920035404.9 authorizes Chinese utility model patent " continuous casting crystallizer for plate billet "
Notification number: CN201380275Y) disclose a kind of continuous casting crystallizer for plate billet, this crystallizer is by two relative width edge plates and biphase
The rectangle working chamber forming narrow side plate is constituted, and the outer surface of described rectangle working chamber is shaped with the bosh of roundabout distribution,
The arc transition curved surface that described narrow side plate and width edge plate adjacent side have, the corner of described rectangle working chamber forms arc transition
The knuckle that curved surface is constituted.The arc radius of this technical scheme is only 2-20mm, predominantly overcomes Vertical Rolling to adjust width to roll
Time processed there is sharp-pointed protruding phenomenon in roughing intermediate blank edge, to avoid the skin that sticks up on consequent hot rolled plate edge surface to lack
Fall into, but, this technical scheme is little to the lifting amplitude of strand corner temperature equally, thus makees solving strand transverse crack
With limited.
Tradition casting mold for continuous casting all uses up big and down small tapering.Although the mould at narrow copper coin of band side chamfering is already
Being applied in actual production, the form of chamfering is various.Such as, " one carries tapering to Chinese invention patent application
Continuous casting steel billet chamfer crystallizer " (application for a patent for invention number: 201110281520.0, publication number: CN102328037A) public affairs
Open a kind of chamfered crystallizer with taper continuous casting plate blank, the relative narrow copper plate of two relatively wide copper coins and two be assembled in one
Rising and constitute, narrow copper plate inner surface is circular arc camber or plane to the fillet surface of wide face copper coin inner surface transition, fillet surface from
Crystallizer is suitable for reading has nature back draught to end opening；The angle that narrow copper plate two ends are formed with wide copper coin is 90 °, and two ends are fallen
The berm width of edged surface is 0～6mm；Fillet surface carries tapered.But, existing chamfer crystallizer technical scheme does not all have
There is the tapering homogeneity question considering chamfered part, there is copper coin corner and intermediate straight portion shrinks inconsistence problems, its
The upper and lower opening chamfer site width in copper coin corner is identical, i.e. the tapering of chamfer site is 0, and chamfered part does not shrinks, all of
Shrinking and all concentrate on middle straight line segment position, the upper and lower opening tapering causing middle straight line segment position is excessive.Copper plate of crystallizer falls
Angular position tapering is not enough, easily makes to produce between plate blank chamfering position and copper plate of crystallizer air gap, causes heat transfer and green shell raw
Length is uneven and causes slab lobe；Especially when chamfering inclined-plane is bigger, do not consider the solidification shrinkage of crystallizer chamfer site,
Inevitably resulting in chamfer site cooling effect poor, make the strand in crystallizer to crack, this is also with big chamfering
Mould at narrow copper coin technology is the major obstacle of application in heavy slab produces.
On the other hand, the cross-sectional profile length of curve of crystallizer internal cavity cast direction shrinkage factor, it is necessary to equal to or slightly
Solidification shrinkage rate less than green shell.If contour curve Length Contraction rate is more than the solidification shrinkage rate of green shell, then process of billet withdrawal
Middle green shell necessarily bears additional deformation, it is impossible to ensures the uniform contact between green shell and crystallizer wall, makes green shell temperature occur
Too high or too low region, increases green shell and the probability of crack defect occurs；Resistance of billet withdrawal the most also can be caused excessive, very
To green shell is broken, while also result in the uneven wear that crystallizer is excessive, reduce the service life of copper plate of crystallizer.As
Really contour curve Length Contraction rate is much smaller than the solidification shrinkage rate of green shell, can be formed excessive between crystallizer inwall and green shell
Gap, cause heat transfer resistance to increase, make the green shell that this has solidified be reheated and melt, thus cause because of thermal stress
Casting blank defect.Especially when casting peritectic steel, hypo-peritectic steel, at the meniscus that molten steel is formed with crystallizer wall contact point
Place, green shell excess shrinkage is easily caused crystallizer corner and disengages with green shell, produces strand cracks of steel side cape defect.Casting
Base condenses contraction in casting cycle, it is possible to departs from crystallizer inwall and produces air gap.Owing to air gap has big thermal resistance,
The heat conductivility making crystallizer is deteriorated, and casting blank shell is thinning, even causes drawing crack bleed-out.In order to prevent bleedout, existing
Crystallizer is usually made the bottom size inverted cone less than size suitable for reading, to reduce the air gap between inwall and green shell, increases knot
The capacity of heat transmission of brilliant device, shell thickness when using crystallizer increases, and can improve casting speed.Falling of plate slab crystallizer
Tapering, the contour curve suitable for reading of the narrowest limit copper coin, corresponding to the shrinkage factor of end opening contour curve, is based on the cold of strand
Solidifying shrinkage characteristics determines.But, owing to the solidification and contraction coefficient of different steel grades is different, it is difficult to accomplish that a tapering shrinks
Curve adapts to all steel grades.
Summary of the invention
It is an object of the invention to provide a kind of band chamfering plate slab crystallizer narrow limit copper coin having and shrinking consistent curve form,
Inconsistent in the Length Contraction rate pouring into a mould direction to solve the cross-sectional profile curve of the crystallizer internal cavity in prior art
Problem, make peritectic steel, hypo-peritectic steel natural shrinking more consistent with the contraction of crystallizer, casting blank shell corner connects with copper coin
Touch tightr, refinement corner tissue, strengthen the anti-crack performance of initial solidification shell, thus more effectively eliminate strand corner
Crack defect.
The present invention solves above-mentioned technical problem and be the technical scheme is that
A kind of corner is with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, and its external shape is up big and down small trapezoidal,
With chamfered region, the back side of copper coin, there is Forced water cooling structure with the work surface left and right sides of steel contacts, it is characterised in that:
Described work surface is up big and down small curved surface, by fall symmetrical with centrage of mid-plane district D1E1E3D3 and both sides
Angular region A1B1C1D1D3C3A3 and E1F1G1H1H3F3E3 seamlessly transits composition；
The contour curve suitable for reading of described plate slab crystallizer narrow limit copper coin is by straight line D1E1 suitable for reading, the funnel curve that centrage is symmetrical
A1B1, G1H1, oblique line B1C1, F1G1 suitable for reading that centrage is symmetrical, and camber line C1D1, E1F1 suitable for reading that centrage is symmetrical
Connect composition；Described funnel curve A1B1 and oblique line B1C1 continual curvature suitable for reading；The two ends of camber line C1D1 suitable for reading are respectively
Tangent with oblique line B1C1 suitable for reading and straight line D1E1 suitable for reading；
The middle profile curve of described plate slab crystallizer narrow limit copper coin is by middle part straight line D2E2, the mid-portion diagonal line that centrage is symmetrical
A2C2, F2H2, and middle part camber line C2D2, E2F2 connection composition that centrage is symmetrical；The two ends of middle part camber line C2D2
Tangent with mid-portion diagonal line A2C2 and middle part straight line D2E2 respectively；
The end opening contour curve of described plate slab crystallizer narrow limit copper coin is by end opening straight line D3E3, the end opening oblique line that centrage is symmetrical
A3C3, F3H3, and end opening camber line C3D3, E3F3 connection composition that centrage is symmetrical；The two ends of end opening camber line C3D3
Tangent with end opening oblique line A3C3 and end opening straight line D3E3 respectively；
The tapering of the chamfered part of described plate slab crystallizer narrow limit copper coin, the most progressively successively decreases along crystallizer short transverse, and
Tapering decline rate progressively slows down；The contour curve length of copper coin level cross-sectionn, described plate slab crystallizer narrow limit, from crystallization
The downward consecutive variations of device upper edge short transverse, forms tapering and successively decreases the hopper zone, corner of funnel-form curve shunk.
The corner of the present invention with the one preferably technical scheme of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, its
It is characterised by that the work surface of described plate slab crystallizer narrow limit copper coin is formed according in the following manner:
Determine the straight line D1E1 suitable for reading shrinkage factor corresponding to end opening straight line D3E3 according to the condensation shrinkage characteristics of strand, determine
Straight line D1E1 suitable for reading and the length of end opening straight line D3E3, and camber line C1D1, E1F1 suitable for reading, middle part camber line C2D2, E2F2
Radius R with end opening camber line C3D3, E3F3；
Oblique line B1C1, F1G1 suitable for reading are connected with the corresponding end points straight line of end opening oblique line A3B3, F3H3, oblique line B1C1 suitable for reading,
The middle each point of F1G1, the some straight line the most corresponding with end opening oblique line A3B3, F3H3 is connected；
Camber line C1D1, E1F1 suitable for reading are connected with the corresponding end points straight line of end opening camber line C3D3, E3F3, camber line C1D1 suitable for reading,
The middle each point of E1F1, the some straight line the most corresponding with end opening camber line C3D3, E3F3 is connected；
The corresponding end points straight line of straight line D1E1 suitable for reading and end opening straight line D3E3 is connected, the middle each point of straight line D1E1 suitable for reading,
The point straight line the most corresponding with end opening straight line D3E3 is connected；
Funnel curve A1B1, G1H1 mouth oblique line A3C3, F3H3 separately down seamlessly transit, and are formed about copper coin center, narrow limit
The funnel-form curved surface that line is symmetrical, described funnel-form curved surface runs vertically down from plate slab crystallizer is suitable for reading, constitutes plate
The hopper zone, corner of billet crystallizer, the extension degree of depth of hopper zone, corner is maximum up to plate slab crystallizer end opening；
Each line segment of described contour curve suitable for reading, is smoothly transitted into each line segment of described end opening contour curve, ultimately forms institute
State the work surface of plate slab crystallizer narrow limit copper coin and steel contacts.
The corner of the present invention with a kind of superior technique scheme of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, its
The funnel curvilinear equation being characterised by described plate slab crystallizer funnel-form curved surface is
Y=f (x)=a6x6+a5x5+a4x4+a3x3,
Wherein, a3、a4、a5、a6For constant, by the maximum open height H of hopper zone, funnel width L, and leak
Bucket curve two-end-point continual curvature condition determines；
The inner chamber of hopper zone, corner along the vertical direction Xray films curve of crystallizer varying level position, by top oblique line,
Intermediate curve section and lower vertical line segment smooth connection are constituted, and hopper zone inner chamber is along the Vertical Square of crystallizer varying level position
Changing to the continual curvature of Xray films curve, first derivative and the second dervative of whole piece curve are continuous；
The intermediate curve section equation of the hopper zone of plate slab crystallizer vertical direction Xray films curve is
Y=(b0+b1z+b2z2+b3z3+b4z4+b5z5)×f(x)；
The top oblique line equation of the hopper zone of plate slab crystallizer vertical direction Xray films curve is
Y=(c0+c1z)×f(x)；
Wherein, b0、b1、b2、b3、b4、b5、c0、c1For constant, by maximum perpendicular degree of depth D of hopper zone, top
The vertical depth d of oblique line, hopper level is than k, and intermediate curve section two-end-point continual curvature condition determines.
The corner of the present invention with a kind of preferably technical scheme of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, its
It is characterised by that described contour curve suitable for reading is than end opening contour curve long 0.5～1.5%.
The corner of the present invention with the technical scheme of a kind of improvement of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, its
It is characterised by the cross section on arbitrary height, oblique line B1C1, F1G1 suitable for reading of copper coin chamfered region, described narrow limit, middle part
Oblique line A2C2, F2H2 and end opening oblique line A3C3, F3H3, with straight line D1E1 suitable for reading, middle part straight line D2E2 and end opening straight line
Angle U between D3E3 is 15～75 °.
The corner of the present invention is with the technical side of a kind of further improvement of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering
Case, it is characterised in that chamfer height A1L1, A2L2 and A3L3 of described narrow limit copper coin are 15～60mm, each chamfering
Length L1D1, L2D2 and L3D3 by cast the 10～50% of width of plate slab.
The invention has the beneficial effects as follows:
1, the corner of the present invention is with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, its chamfering hopper zone working curved surface
Part changes at any point continual curvature, and green shell can be avoided to produce the stress of local in motion deformation and contraction process
Concentrate.It is adapted to the solidification and contraction coefficient difference of different steel grade, increases the steel grade scope of application of narrow limit copper coin.
2, the corner of the present invention is with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, and its hopper zone, corner is along height side
The most progressively successively decreasing to tapering, decline rate progressively slows down, and keeps consistent with the solidification shrinkage of green shell, can make solidification
The deformation drag of green shell is less.
3, the corner of the present invention is with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, and the cross-sectional profile of its inner chamber is bent
Line length is at the shrinkage factor consecutive variations in cast direction, and is held equal to or the solidification shrinkage rate of slightly smaller than green shell, permissible
Ensure the initial solidification shell crystal grain refinement in strand corner and copper plate of crystallizer good contact, beneficially crystallizer, increase green shell strong
Degree, when preventing continuous casting, green shell cracks.
Accompanying drawing explanation
Fig. 1 is the corner structural representation with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering of the present invention；
Fig. 2 is the corner schematic rear view with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering of the present invention；
Fig. 3 is the corner contour curve schematic diagram suitable for reading with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering；
Fig. 4 is the middle profile curve synoptic diagram of hopper zone, the corner closing position of plate slab crystallizer of the present invention narrow limit copper coin；
Fig. 5 is the corner end opening contour curve schematic diagram with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering；
Fig. 6 is that hopper zone, the corner contour curve suitable for reading of plate slab crystallizer of the present invention narrow limit copper coin forms schematic diagram；
Fig. 7 is that longitudinal cross-section, hopper zone, the corner contour curve of plate slab crystallizer of the present invention narrow limit copper coin forms schematic diagram；
Fig. 8 is that hopper zone, the corner tapering of plate slab crystallizer of the present invention narrow limit copper coin changes schematic diagram along short transverse.
In figure, 1-work surface, 2-is suitable for reading, 3-end opening, the 4-back side, in the middle part of 5-(hopper zone, corner closing position)；
K1J1, K3J3 are respectively the width of narrow limit trapezoidal copper upper and lower opening；
D1E1, D2E2, D3E3 are respectively suitable for reading, middle part and end opening straight line (and length), the D1E1E3D3 of working curved surface
Mid-plane district for working curved surface；
B1C1, F1G1, A2C2, F2H2, A3C3, F3H3 are the most suitable for reading, the chamfering oblique line of middle part and end opening (and
Length)；B1C1, A2C2, A3C3 and F1G1, F2H2, F3H3 are respectively about narrow limit copper coin centrage symmetry；U is upper
The angle of mouth oblique line B1C1 and straight line D1E1 suitable for reading, the angle of mid-portion diagonal line A2C2 and straight line D2E2, end opening oblique line A3C3
With the angle of end opening straight line D3E3, and chamfering oblique line F1G1, F2H2, F3H3 symmetrical therewith and line correspondence D1E1,
The angle of D2E2, D3E3 is all equal with angle U；
C1D1, E1F1, C2D2, E2F2, C3D3, E3F3 be respectively suitable for reading, the middle part of working curved surface and end opening camber line (and
Its arc length)；C1D1, C2D2, C3D3 and E1F1, E2F2, E3F3 are respectively about narrow limit copper coin centrage symmetry；R is
Suitable for reading, middle part and end opening camber line C1D1, C2D2, C3D3 and E1F1, the radius of E2F2, E3F3；A1L1、A2L2、
A3L3 is the most suitable for reading, middle part, the chamfer height of end opening；L1D1, L2D2, L3D3 are the most suitable for reading, middle part, end opening
Chamfering length；
H is the maximum open height that plate slab crystallizer funnel is suitable for reading；L is funnel width suitable for reading；D is funnel vertical cross-section
The maximum perpendicular degree of depth；D is the vertical depth of funnel vertical cross-section top oblique line；K is hopper level ratio, i.e. funnel vertically cuts
The top oblique line of facial contour curve and the hopper level of intermediate curve section junction point, the funnel suitable for reading with plate slab crystallizer is maximum
The ratio of open height H.
Detailed description of the invention
For better understanding of the technique scheme of the present invention, carry out the most detailed with embodiment below in conjunction with the accompanying drawings
Thin description.
The corner of the present invention is with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, and its external shape is up big and down small
Trapezoidal, with chamfered region, the back side 4 of copper coin, there is Forced water cooling structure with work surface 1 left and right sides of steel contacts；
As depicted in figs. 1 and 2,
Described work surface 1 is up big and down small curved surface, by mid-plane district D1E1E3D3 and both sides and centrage symmetry
Chamfered region A1B1C1D1D3C3A3 and E1F1G1H1H3F3E3 seamlessly transits composition；
The contour curve A1B1C1D1E1F1G1H1 suitable for reading of described plate slab crystallizer narrow limit copper coin as it is shown on figure 3, by suitable for reading directly
Line D1E1, funnel curve A1B1, G1H1 that centrage is symmetrical, oblique line B1C1, F1G1 suitable for reading that centrage is symmetrical, and
Camber line C1D1, E1F1 suitable for reading connection composition that centrage is symmetrical；Described funnel curve A1B1 and oblique line B1C1 suitable for reading is bent
Rate is continuous, the most at least meets mathematical 2 rank smooth connected；The two ends of camber line C1D1 suitable for reading respectively with oblique line B1C1 suitable for reading
Tangent with straight line D1E1 suitable for reading；Wherein, the length of described oblique line B1C1 and F1G1 suitable for reading can be 0, when this is a length of
When 0, funnel curve A1B1 and straight line D1E1 suitable for reading is directly connected to and continual curvature；
The middle profile curve A2C2D2E2F2H2 of described plate slab crystallizer narrow limit copper coin as shown in Figure 4, by middle part straight line
D2E2, mid-portion diagonal line A2C2, F2H2 that centrage is symmetrical, and middle part camber line C2D2, E2F2 connection that centrage is symmetrical
Composition；The two ends of middle part camber line C2D2 are tangent with mid-portion diagonal line A2C2 and middle part straight line D2E2 respectively；
The end opening contour curve A3C3D3E3F3H3 of described plate slab crystallizer narrow limit copper coin is as it is shown in figure 5, by end opening straight line
D3E3, end opening oblique line A3C3, F3H3 that centrage is symmetrical, and end opening camber line C3D3, E3F3 connection that centrage is symmetrical
Composition；The two ends of end opening camber line C3D3 are tangent with end opening oblique line A3C3 and end opening straight line D3E3 respectively；
The tapering of the chamfered part of described plate slab crystallizer narrow limit copper coin, the most progressively successively decreases along crystallizer short transverse, and
Tapering decline rate progressively slows down；The contour curve length of copper coin level cross-sectionn, described plate slab crystallizer narrow limit, from crystallization
The downward consecutive variations of device upper edge short transverse, forms tapering and successively decreases the hopper zone, corner of funnel-form curve shunk, corner
The tapering of hopper zone is along short transverse change curve as shown in Figure 8；
Contour curve suitable for reading, middle profile curve and the end opening contour curve of described plate slab crystallizer narrow limit copper coin, closes respectively
Symmetrical in narrow limit copper coin centrage, the chamfered region of symmetrical side can be generated by mirror image.
Corner according to the present invention is with an embodiment of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, described plate
The work surface 1 of billet crystallizer narrow limit copper coin is formed according in the following manner:
Determine the straight line D1E1 suitable for reading shrinkage factor corresponding to end opening straight line D3E3 according to the condensation shrinkage characteristics of strand, determine
Straight line D1E1 suitable for reading and the length of end opening straight line D3E3, and camber line C1D1, E1F1 suitable for reading, middle part camber line C2D2, E2F2
Radius R with end opening camber line C3D3, E3F3；
Oblique line B1C1, F1G1 suitable for reading are connected with the corresponding end points straight line of end opening oblique line A3B3, F3H3, oblique line B1C1 suitable for reading,
The middle each point of F1G1, the some straight line the most corresponding with end opening oblique line A3B3, F3H3 is connected；
Camber line C1D1, E1F1 suitable for reading are connected with the corresponding end points straight line of end opening camber line C3D3, E3F3, camber line C1D1 suitable for reading,
The middle each point of E1F1, the some straight line the most corresponding with end opening camber line C3D3, E3F3 is connected；
The corresponding end points straight line of straight line D1E1 suitable for reading and end opening straight line D3E3 is connected, the middle each point of straight line D1E1 suitable for reading,
The point straight line the most corresponding with end opening straight line D3E3 is connected；
Funnel curve A1B1, G1H1 mouth oblique line A3C3, F3H3 separately down seamlessly transit, and are formed about copper coin center, narrow limit
The funnel-form curved surface that line is symmetrical, described funnel-form curved surface runs vertically down from plate slab crystallizer is suitable for reading, constitutes plate
The hopper zone, corner of billet crystallizer, the extension degree of depth of hopper zone, corner is maximum up to plate slab crystallizer end opening；Hopper zone, corner
Extension closing position form middle profile curve A2C2D2E2F2H2 as shown in Figure 4；
Each line segment of described contour curve A1B1C1D1E1F1G1H1 suitable for reading, is smoothly transitted into described end opening contour curve
Each line segment of A3C3D3E3F3H3, ultimately forms the work surface 1 of described plate slab crystallizer narrow limit copper coin and steel contacts.
Following description is with the funnel curved surface between funnel curve G1H1 (on the right side of Fig. 3) and end opening oblique line F3H3 (on the right side of Fig. 5)
As a example by, the funnel curved surface between funnel curve A1B1 and end opening oblique line A3C3 can be generated by mirror image.Shown in Figure 6
Coordinate system, it is suitable for reading that zero is positioned at copper coin, the intersection point G1 of curve G1H1 and oblique line F1G1, and X-axis is positioned at oblique line F1G1
Extended line on, Y-axis is perpendicular to X-axis, and Z axis is vertically downward.
Corner according to the present invention is with an embodiment of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, described plate
The funnel curvilinear equation of billet crystallizer funnel-form curved surface is
Y=f (x)=a6x6+a5x5+a4x4+a3x3,
Wherein, a3、a4、a5、a6For constant, by the maximum open height H of hopper zone, funnel width L, and leak
Bucket curve two-end-point continual curvature condition determines；As shown in Figure 3 and Figure 6, curve G1H1 and oblique line F1G1 G1 point single order,
Second dervative is continuous, i.e. continual curvature, and the extended line of oblique line F1G1 is H1 with the intersection point of narrow limit copper coin side；G1H1 line
Segment length is funnel width L, and midpoint (L/2) curve of corresponding line segment G1H1 is at M1 point acquirement maximum open height H, meanwhile,
The extended line of curve G1H1 and oblique line F1G1 is continuous in H1 point first derivative and second dervative, i.e. continual curvature.
The inner chamber of hopper zone, corner along the vertical direction Xray films curve of crystallizer varying level position, by top oblique line,
Intermediate curve section and lower vertical line segment smooth connection are constituted, and hopper zone inner chamber is along the Vertical Square of crystallizer varying level position
Change to the continual curvature of Xray films curve (including straight line portion), the first derivative of whole piece curve and second dervative
Continuously；When hopper zone, corner extends to plate slab crystallizer end opening, a length of the 0 of described lower vertical line segment；At Fig. 7
In shown embodiment, the junction point of top oblique line and intermediate curve section be upper junction point B (kf (x), d), intermediate curve section with
The junction point of lower vertical line segment is lower junction point C (0, D)；
The intermediate curve section equation of the hopper zone of plate slab crystallizer vertical direction Xray films curve is
Y=(b0+b1z+b2z2+b3z3+b4z4+b5z5)×f(x)；
The top oblique line equation of the hopper zone of plate slab crystallizer vertical direction Xray films curve is
Y=(c0+c1z)×f(x)；
Wherein, b0、b1、b2、b3、b4、b5、c0、c1For constant, by maximum perpendicular degree of depth D of hopper zone, top
The vertical depth d of oblique line, hopper level is than k, and intermediate curve section two-end-point continual curvature condition determines；Tie at slab
In brilliant device vertical direction, along the Xray films curve of x-axis different parts, the most simultaneously by the funnel curve of funnel-form curved surface
Equation y=f (x)=a6x6+a5x5+a4x4+a3x3Constraint.
Between the corresponding point of funnel curve G1H1 and end opening oblique line F3H3, the vertical direction Xray films described in application is bent
Line is in smoothing junction, constitutes the funnel curved surface between funnel curve G1H1 and end opening oblique line F3H3；
Generate the funnel curved surface between funnel curve A1B1 and end opening oblique line A3C3 finally by mirror image, form described slab knot
The hopper zone, corner of brilliant device narrow limit copper plate working surface 1.
Corner according to the present invention with an embodiment of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, described on
Mouth contour curve A1B1C1D1E1F1G1H1 is than end opening contour curve A3C3D3E3F3H3 long 0.5～1.5%.
Corner according to the present invention is with an embodiment of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, arbitrarily
In cross section on height, oblique line B1C1, F1G1 suitable for reading of copper coin chamfered region, described narrow limit, mid-portion diagonal line A2C2, F2H2
With the angle between end opening oblique line A3C3, F3H3, and straight line D1E1 suitable for reading, middle part straight line D2E2 and end opening straight line D3E3
U is 15～75 °.
Corner according to the present invention is with an embodiment of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, described narrow
Chamfer height A1L1, A2L2 and A3L3 of limit copper coin is 15～60mm, length L1D1 of each chamfering, L2D2 and L3D3
By cast the 10～50% of width of plate slab.
Embodiment
The corner of the present invention is with the main ginseng of a specific embodiment of the plate slab crystallizer narrow limit copper coin of consecutive variations tapering
Number is as follows:
The width K1J1 suitable for reading of trapezoidal narrow limit copper coin is 313.6mm, and end opening width K3J3 is 311.0mm；Copper coin pars intermedia
The thickness L1K1=L3K3=39mm divided.
The contour curve A1B1C1D1E1F1G1H1 suitable for reading of narrow limit copper coin is by straight line D1E1 suitable for reading, the funnel that centrage is symmetrical
Curve A1B1, G1H1, oblique line B1C1, F1G1 suitable for reading that centrage is symmetrical, and the symmetrical camber line C1D1 suitable for reading of centrage,
E1F1 connects composition；The a length of 175.43mm of straight line D1E1 suitable for reading, the arc length of camber line C1D1 and E1F1 suitable for reading is
17.64mm, arc radius R=30mm；The a length of 3.03mm of oblique line B1C1 and F1G1 suitable for reading, oblique line B1C1 suitable for reading and
The angle of F1G1 and straight line D1E1 suitable for reading is 33.69 °；The a length of 62.10mm of funnel curve A1B1 and G1H1；
The two ends of straight line D1E1 suitable for reading are tangent with camber line C1D1 and E1F1 suitable for reading respectively, camber line C1D1 and E1F1 suitable for reading respectively with
Oblique line B1C1 and F1G1 suitable for reading is tangent, oblique line B1C1 and F1G1 suitable for reading respectively with funnel curve A1B1 and G1H1 second order
Smooth connected.
The middle profile curve A2C2D2E2F2H2 of hopper zone closing position is away from vertical height 350mm suitable for reading, by middle part straight line
D2E2, mid-portion diagonal line A2C2, F2H2 that centrage is symmetrical, and middle part camber line C2D2, E2F2 connection that centrage is symmetrical
Composition；The a length of 63.03mm of a length of 174.42mm, mid-portion diagonal line A2C2 and F2H2 of middle part straight line D2E2, in
The arc length of portion camber line C2D2 and E2F2 be 17.64mm, arc radius R=30mm, mid-portion diagonal line A2C2 and F2H2 with
The angle of middle part straight line D2E2 is 33.69 °；Middle part straight line D2E2 two ends respectively with middle part camber line C2D2 and E2F2
Tangent, middle part camber line C2D2 and E2F2 is tangent with mid-portion diagonal line A2C2 and F2H2 respectively.
Narrow limit copper coin end opening away from vertical height 900mm suitable for reading, end opening contour curve A3C3D3E3F3H3 by end opening straight line D3E3,
End opening oblique line A3C3, F3H3 that centrage is symmetrical, and end opening camber line C3D3, E3F3 connection composition that centrage is symmetrical；
The a length of 172.83mm of end opening straight line D3E3, a length of 63.03mm of end opening oblique line A3C3 and F3H3, end opening camber line
The arc length of C3D3 and E3F3 is 17.64mm, arc radius R=30mm, end opening oblique line A3C3 and F3H3 and end opening straight line
The angle of D3E3 is 33.69 °；The two ends of end opening straight line D3E3 are tangent with end opening camber line C3D3 and E3F3 respectively, under
Camber line C3D3 and E3F3 is tangent with end opening oblique line A3C3 and F3H3 respectively for mouth.
As the maximum open height H=3mm of hopper zone, during funnel width L=60mm, in XOY coordinate system, slab is tied
The funnel curvilinear equation of brilliant device funnel-form curved surface is
Y=f (x)=8.8889 × 10-4x3-4.4444×10-5x4+7.4074×10-7x5-4.1152×10-9x6；
Work as D=350, when k=0.1, d=60, in YOZ coordinate system, plate slab crystallizer vertical direction Xray films curve
The top oblique line equation of hopper zone be y=(1-3.103448 × 10-3z)×f(x)；
The intermediate curve section equation of the hopper zone of plate slab crystallizer vertical direction Xray films curve is
Y=(-5.3214 × 10-11z5+7.7958×10-8z4-4.5136×10-5z3+0.0155797z2-3.6517z+102.5559)×f(x)。
In the present embodiment, narrow limit copper coin carries tapering 0.40mm on the right of chamfered part.The corner funnel of narrow limit copper coin
The tapering in district progressively successively decreases along short transverse, and decline rate progressively slows down.
Those of ordinary skill in the art is it should be appreciated that above embodiment is intended merely to illustrate the skill of the present invention
Art scheme, and it is not used as limitation of the invention, any connotation based on the present invention is to embodiment described above
The change made, modification, all will fall in the scope of the claims of the present invention.
Claims (6)
1. corner is with a plate slab crystallizer narrow limit copper coin for consecutive variations tapering, and its external shape is up big and down small ladder
Shape, has Forced water cooling structure with the work surface left and right sides of steel contacts with chamfered region, the back side of copper coin, its
It is characterised by:
Described work surface is up big and down small curved surface, by mid-plane district D1E1E3D3 and both sides and centrage symmetry
Chamfered region A1B1C1D1D3C3A3 and E1F1G1H1H3F3E3 seamlessly transits composition；
The contour curve suitable for reading of described plate slab crystallizer narrow limit copper coin is by straight line D1E1 suitable for reading, and the funnel of centrage symmetry is bent
Line A1B1, G1H1, oblique line B1C1, F1G1 suitable for reading that centrage is symmetrical, and the arc suitable for reading that centrage is symmetrical
Line C1D1, E1F1 connect composition；Described funnel curve A1B1 and oblique line B1C1 continual curvature suitable for reading；On
The two ends of mouth camber line C1D1 are tangent with oblique line B1C1 suitable for reading and straight line D1E1 suitable for reading respectively；
The middle profile curve of described plate slab crystallizer narrow limit copper coin is by middle part straight line D2E2, and the middle part of centrage symmetry is oblique
Line A2C2, F2H2, and middle part camber line C2D2, E2F2 connection composition that centrage is symmetrical；Middle part camber line C2D2
Two ends tangent with mid-portion diagonal line A2C2 and middle part straight line D2E2 respectively；
The end opening contour curve of described plate slab crystallizer narrow limit copper coin is by end opening straight line D3E3, and the end opening of centrage symmetry is oblique
Line A3C3, F3H3, and end opening camber line C3D3, E3F3 connection composition that centrage is symmetrical；End opening camber line C3D3
Two ends tangent with end opening oblique line A3C3 and end opening straight line D3E3 respectively；
The tapering of the chamfered part of described plate slab crystallizer narrow limit copper coin, the most progressively successively decreases along crystallizer short transverse, and
Tapering decline rate progressively slows down；The contour curve length of copper coin level cross-sectionn, described plate slab crystallizer narrow limit, from
The downward consecutive variations of crystallizer upper edge short transverse, forms tapering and successively decreases the corner funnel of funnel-form curve shunk
District.
Corner the most according to claim 1 is with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, it is characterised in that
The work surface of described plate slab crystallizer narrow limit copper coin is formed according in the following manner:
The straight line D1E1 suitable for reading shrinkage factor corresponding to end opening straight line D3E3 is determined, really according to the condensation shrinkage characteristics of strand
Fixed straight line D1E1 suitable for reading and the length of end opening straight line D3E3, and camber line C1D1, E1F1 suitable for reading, middle part camber line
C2D2, E2F2 and the radius R of end opening camber line C3D3, E3F3；
Oblique line B1C1, F1G1 suitable for reading are connected with the corresponding end points straight line of end opening oblique line A3B3, F3H3, oblique line suitable for reading
The middle each point of B1C1, F1G1, the some straight line the most corresponding with end opening oblique line A3B3, F3H3 is connected；
Camber line C1D1, E1F1 suitable for reading are connected with the corresponding end points straight line of end opening camber line C3D3, E3F3, camber line suitable for reading
The middle each point of C1D1, E1F1, the some straight line the most corresponding with end opening camber line C3D3, E3F3 is connected；
The corresponding end points straight line of straight line D1E1 suitable for reading and end opening straight line D3E3 is connected, and the centre of straight line D1E1 suitable for reading is each
Point, the some straight line the most corresponding with end opening straight line D3E3 is connected；
Funnel curve A1B1, G1H1 mouth oblique line A3C3, F3H3 separately down seamlessly transit, and are formed about narrow limit copper coin
The funnel-form curved surface that centrage is symmetrical, described funnel-form curved surface runs vertically down from plate slab crystallizer is suitable for reading,
Constituting the hopper zone, corner of plate slab crystallizer, the extension degree of depth of hopper zone, corner is maximum up to plate slab crystallizer end opening；
Each line segment of described contour curve suitable for reading, is smoothly transitted into each line segment of described end opening contour curve, ultimately forms institute
State the work surface of plate slab crystallizer narrow limit copper coin and steel contacts.
Corner the most according to claim 2 is with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, it is characterised in that
The funnel curvilinear equation of described plate slab crystallizer funnel-form curved surface is
Y=f (x)=a6x6+a5x5+a4x4+a3x3,
Wherein, a3、a4、a5、a6For constant, by the maximum open height H of hopper zone, funnel width L, and leak
Bucket curve two-end-point continual curvature condition determines；
The inner chamber of hopper zone, corner along the vertical direction Xray films curve of crystallizer varying level position, by top oblique line,
Intermediate curve section and lower vertical line segment smooth connection are constituted, hopper zone inner chamber hanging down along crystallizer varying level position
Nogata changes to the continual curvature of Xray films curve, and first derivative and the second dervative of whole piece curve are continuous；
The intermediate curve section equation of the hopper zone of plate slab crystallizer vertical direction Xray films curve is
Y=(b0+b1z+b2z2+b3z3+b4z4+b5z5)×f(x)；
The top oblique line equation of the hopper zone of plate slab crystallizer vertical direction Xray films curve is
Y=(c0+c1z)×f(x)；
Wherein, b0、b1、b2、b3、b4、b5、c0、c1For constant, by maximum perpendicular degree of depth D of hopper zone, on
The vertical depth d of portion's oblique line, hopper level is than k, and intermediate curve section two-end-point continual curvature condition determines.
4. according to the corner described in claim 1,2 or 3 with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, its
It is characterised by that described contour curve suitable for reading is than end opening contour curve long 0.5～1.5%.
5. according to the corner described in claim 1,2 or 3 with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, its
It is characterised by the cross section on arbitrary height, oblique line B1C1, F1G1 suitable for reading of copper coin chamfered region, described narrow limit,
Mid-portion diagonal line A2C2, F2H2 and end opening oblique line A3C3, F3H3, with straight line D1E1 suitable for reading, middle part straight line D2E2
With the angle U between end opening straight line D3E3 is 15～75 °.
6. according to the corner described in claim 1,2 or 3 with the plate slab crystallizer narrow limit copper coin of consecutive variations tapering, its
It is characterised by that chamfer height A1L1, A2L2 and A3L3 of described narrow limit copper coin are 15～60mm, each chamfering
Length L1D1, L2D2 and L3D3 by cast the 10～50% of width of plate slab.
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| CN201510090728.2A CN105983665A (en) | 2015-02-28 | 2015-02-28 | Narrow-edge copper plate for slab mold with continuous variable taper at corner |
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| CN201510090728.2A CN105983665A (en) | 2015-02-28 | 2015-02-28 | Narrow-edge copper plate for slab mold with continuous variable taper at corner |
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| CN113399637A (en) * | 2021-06-24 | 2021-09-17 | 重庆钢铁股份有限公司 | Process for preventing crack bleed-out in Q195 steel square billet continuous casting pouring process |
| CN114178496A (en) * | 2021-11-26 | 2022-03-15 | 安徽马钢表面技术股份有限公司 | Arc correction device and arc correction method for heavy H-shaped steel crystallizer |
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