CN105983668A - Soft reduction roller, soft reduction device with same and manufacturing method of casting blank - Google Patents
Soft reduction roller, soft reduction device with same and manufacturing method of casting blank Download PDFInfo
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- CN105983668A CN105983668A CN201510089773.6A CN201510089773A CN105983668A CN 105983668 A CN105983668 A CN 105983668A CN 201510089773 A CN201510089773 A CN 201510089773A CN 105983668 A CN105983668 A CN 105983668A
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Abstract
The invention provides a soft reduction roller, a soft reduction device with same and a manufacturing method of a casting blank. The diameter of the end of the soft reduction roller is smaller than that of the middle part of the soft reduction roller. Under the observation of the cross section, comprising the rotation axis, of the soft reduction roller, the outer periphery of the soft reduction roller between the middle part and the end part comprises an arc 1 which is fish-bellied towards the rotation axis at the end part side and an arc 2 which is fish-bellied in the opposite direction of the arc 1 at the middle part side, and the angle of the tangent line between the arc 1 and the arc 2 and the rotation axis is equal to or below 40 degrees.
Description
Technical field
The present invention relates to slighter compress roller, the slighter compress device with this slighter compress roller and the manufacture of strand
Method.
Background technology
The continuous casting equipment of steel has the liquation injected via nozzle from tundish for cooling and makes
Strand that the mold of the strand of predetermined size and supporting surface element have solidified also draws from mold continuously
Pull out the strand support of this strand.The surface element of strand first solidifies than inside, and therefore surface element is than inside more
Big degree ground shrinks.Therefore, cavity is produced in the inside of strand.
Propose there is following scheme: at strand support, before the solidified inside of strand, in order to from up and down
Strand is implemented slighter compress by the slighter compress roller arranged across the mode that strand is relative, reduces the inside institute of strand
The cavity (see, for example Japanese Unexamined Patent Publication 2003-94154 publication) produced.
The rolling stock such as steel plate and bar steel is become through rolling by the strand of slighter compress.Require as much as possible
Reduce defect produced by the surface of rolling stock.But, according to the research of the present inventor,
When manufacturing strand, the recess formed in the operation of slighter compress strand becomes sometimes according to its shape and is rolling
The surface of prepared material produces the main cause of defect.
Fig. 6 and Fig. 7 is in the operation of rolling carried out after slighter compress, at the surface of rolling stock product
The figure that one of mechanism of raw defect illustrates.Fig. 6 and Fig. 7 schematically illustrates the length direction with strand
Orthogonal cross section.Strand 303 is to use the continuous casting equipment with slighter compress device to manufacture.
Upper surface at strand 303 is formed with the recess 302 produced due to slighter compress.
Recess 302 has bottom surface 302b and side 302a.Added by the strand 303 of slighter compress device slighter compress
After being heated in hot stove, it is rolled into as rolling stock.Use such as shown in (a) of Fig. 6
The roll 301 (barrel roll) that configures in the way of clamping strand 303 in the horizontal and to press from both sides in the vertical
The roll 305 (vertical roller) that firmly mode of strand 303 configures rolls.Roll 301,305 is towards strand
The center position pressing strand 303 of 303.
By roll 301,305 pressing carried out, strand 303 is rolled.Along with rolling, strand
The recess 302 of 303 deforms.Now, there is the side 302a of recess 302 as shown in (b) of Fig. 6
Swing to the situation of inner side (medial side of recess 302).So, if opening at the side 302a of recess 302
Under the state that beginning swings to medial side, roll further, then as shown in (a) of Fig. 7, recess 302
Split into two.If also continuing to rolling, then as shown in (b) of Fig. 7, recess 302 becomes defect (folding
Enter defect (Japanese: folding defect)).Additionally, it is by recess 302 that the defect on the surface of rolling stock there is also
Side and bottom surface between corner angle 302c situation about causing.
Summary of the invention
Therefore, on the one hand, it is an object of the invention to provide the surface that can reduce rolling stock fully
The slighter compress roller that the slighter compress device of produced defect and slighter compress device are used.On the other hand,
It is an object of the invention to provide and can reduce the casting of defect produced by the surface of rolling stock fully
The manufacture method of base.
On the one hand, the present invention provides a kind of slighter compress roller, and the diameter of its end is less than the diameter of pars intermedia,
Wherein, when observing the cross section comprising rotation axis of slighter compress roller, the periphery between pars intermedia and end
In end side, there is the 1st circular arc bloated towards rotation axis and have towards with the 1st in pars intermedia side
Circular arc bloat the 2nd circular arc that direction in opposite direction bloats, with both the 1st circular arc and the 2nd circular arc phase
The tangent line cut and rotation axis angulation are less than 40 °.
By using above-mentioned slighter compress roller to carry out slighter compress to the strand of continuous casting equipment manufacture,
The shape of the recess formed at the upper surface of strand can be controlled such that it is able to reduce fully in rolling
Defect produced by the surface of material.That is, slighter compress roller has above-mentioned peripheral shape, it is possible to press down
Make and between bottom surface and the side of the recess formed at strand, form corner angle.Thereby, it is possible to reduce fully
Rolling stock produces defect.It addition, interval between a pair side can made in recess along with away from
The central part of strand and become big cone-shaped.I.e., it is possible to recess is made from the inside of strand towards outside
The shape gone and gradually expand.Thereby, it is possible to when rolling strand, the side being adequately suppressed recess is fallen
To inner side such that it is able to reduce fully and produce defect on the surface of rolling stock.
The radius of curvature of the 2nd circular arc can be more than 30mm.The radius of curvature of the 1st circular arc can be 50mm
Below.The radius of curvature of the 2nd circular arc can be bigger than the radius of curvature of the 1st circular arc.The curvature of the 2nd circular arc half
Footpath can be below 80mm.The radius of curvature of the 1st circular arc can be more than 20mm.
On the other hand, the present invention provides a kind of slighter compress device, is the slighter compress device for strand, its
In, this slighter compress device possesses: pair of rolls, and it is to set in the vertical direction in the way of strand is relative
Put；Support, roller is supported as rotating by it；And prelum, it comes strand by pair of rolls
Carrying out slighter compress, at least one in pair of rolls is above-mentioned slighter compress roller.
At least one in the pair of rolls of above-mentioned slighter compress device is above-mentioned slighter compress roller.By using
This slighter compress roller carries out slighter compress to the strand of continuous casting equipment manufacture, it is possible to control the upper of strand
The shape of the recess that surface is formed such that it is able to reduce fully and lack produced by the surface of rolling stock
Fall into.That is, by having above-mentioned peripheral shape, it is possible to suppress the bottom surface of recess that formed at strand with
Corner angle are formed between side.Thereby, it is possible to reduce rolling stock fully to produce defect.It addition, can
Make the cone-shaped that the interval between a pair side in recess becomes big along with the central part away from strand.
I.e., it is possible to recess is made the inside from strand and goes towards outside and the shape that gradually expands.Thus, energy
Enough when rolling strand, inner side is swung in the side being adequately suppressed recess such that it is able to reduce fully
The surface of rolling stock produces defect.
On the other hand, the present invention provides the manufacture method of a kind of strand, is the casting using continuous casting equipment
The manufacture method of base, wherein, the manufacture method of this strand have carry in the horizontal direction from mold to
Lower section pull out strand, while this strand to be carried out with above-mentioned slighter compress roller the operation of slighter compress,
In this operation, at the outer surface of at least pars intermedia in the outer surface of slighter compress roller and the 2nd circular arc
Outer surface contact with strand this strand carried out slighter compress.
This manufacture method employs above-mentioned slighter compress roller.In the operation of slighter compress, outside slighter compress roller
It is right that outer surface at the outer surface of at least pars intermedia in perimeter surface and the 2nd circular arc contacts with strand
This strand carries out slighter compress.Therefore, it is possible between suppression bottom surface and the side of recess that are formed at strand
Form corner angle.Thereby, it is possible to reduce rolling stock fully to produce defect.It addition, recess can be made
In a pair side between interval become big cone-shaped along with the central part away from strand.I.e., it is possible to
Recess is made the inside from strand go towards outside and the shape that gradually expands.Thereby, it is possible in rolling
During strand, inner side is swung in the side being adequately suppressed recess such that it is able to reduce fully at rolling stock
Surface produce defect.
On the one hand, the present invention can provide defect produced by the surface that can reduce rolling stock fully
Slighter compress device and the slighter compress roller that used of slighter compress device.On the other hand, the present invention can
Offer can reduce the manufacture method of the strand of defect produced by the surface of rolling stock fully.
Accompanying drawing explanation
Fig. 1 is an embodiment of the continuous casting equipment of the slighter compress device representing and possessing the present invention
Figure.
Fig. 2 is the schematic sectional view of the slighter compress device of one embodiment of the present invention.
Fig. 3 is the axonometric chart of the slighter compress roller that slighter compress device is possessed.
Fig. 4 is the local of the contact portion of in the cross section shown in enlarged representation Fig. 2, strand and slighter compress roller
Figure.
Fig. 5 is the cross section of the strand utilizing the continuous casting equipment of the slighter compress device possessing Fig. 1 to obtain
Figure.
Fig. 6 is to lack producing in the operation of rolling carried out after slighter compress, on the surface of rolling stock
The figure that one of mechanism fallen into illustrates.
Fig. 7 is to producing defect in the operation of rolling carried out after slighter compress, on the surface of rolling stock
The figure that illustrates of one of mechanism.
Fig. 8 is the figure representing the sample collection position when segregation of the central part to strand is evaluated.
Detailed description of the invention
Referring to the drawings embodiments of the present invention are illustrated.But, following embodiment is
For the illustration of the present invention is described, its purport does not also lie in and limits the invention to content below.Saying
In bright, to identity element or there is the element of same function use same reference, and according to circumstances
The repetitive description thereof will be omitted.It addition, position relationship such as grade is as long as no illustrating the most in advance up and down, just
Regard position relationship based on position relationship shown in the drawings as.And, the dimension scale of accompanying drawing does not limit
Ratio due to diagram.
Fig. 1 is an embodiment of the continuous casting equipment of the slighter compress device representing and possessing present embodiment
Side view.Continuous casting equipment 100 possesses and is filled with the casting ladle 102 of molten steel 101, is arranged at casting ladle 102
Lower section and store from the bottom of casting ladle 102 centre by the molten steel 101 of the nozzle bore of casting ladle nozzle 103
Bag 105, it is arranged at mold 104 and the strand support 110 of the lower section of tundish 105.
It is vertical that strand support 110 has that the strand 10 making to pull out from mold 104 circulates downwards
With 14, make the curved bel 15 that strand 10 bends, the correction belt 16 that the strand 10 bent is aligned,
And carry the horizontal stripes 17 of strand 10 in the horizontal direction.In belt 14, curved bel 15 and rectification
With 16 be respectively arranged with on thickness direction in the way of strand 10 relatively and in outer surface and casting
The strand backing roll 40 of base 10 contact.
Strand backing roll 40 has the rotary shaft of the width extension along strand 10, this strand backing roll
40 are configured to while rotating centered by rotary shaft while making strand 10 downstream effluent lead to.That is, strand props up
Runner 40 is consolidated in the way of its rotary shaft is at a right angle relative to the circulating direction of strand 10 (drawing direction)
It is set to and can circumferentially rotate in direction.
At horizontal stripes 17, to be provided with paired slighter compress roller in the way of strand 10 is relative up and down
50、60.Slighter compress roller 50 is arranged at the upside of strand 10, and slighter compress roller 60 is arranged at the downside of strand 10.
In horizontal stripes 17, the length direction along strand 10 is disposed with multiple paired slighter compress roller 50,60.
Also slighter compress roller 60 is had to be arranged at curved bel 15 or the situation of correction belt 16.Paired slighter compress roller 50,
The quantity limit the most processed of 60.Paired slighter compress roller 50,60 is at respective outer surface and strand
10 contacts.Identically with strand backing roll 40, paired slighter compress roller 50,60 has along strand 10
The rotary shaft that width extends, this paired slighter compress roller 50,60 rotates slighter compress strand
10.Slighter compress roller 50,60 is fixed as rotating by the most unshowned supporting member etc..
The strand 10 the most only surface element solidification pulled out from mold 104.Thus on the surface of strand 10
Portion forms so-called solidified shell 11.On the other hand, the inside at strand 10 has fusing department (not solidifying portion)
12.Then, strand 10 is along with flowing in belt 14, curved bel 15, correction belt 16 and horizontal stripes 17
Leading to and be cooled, solidified shell 11 is grown up.Along with the growth of solidified shell 11, fusing department 12 reduces, solidification
The thickness of shell 11 increases.
In horizontal stripes 17, strand 10 has fusing department 12 in inside.By with slighter compress roller 50,60 to casting
Base 10 carries out slighter compress, controls the flowing of the enrichment molten steel of the inside of strand 10.Thereby, it is possible to suppression companion
The contraction that causes along with the cooling of the surface element by the solidification of fusing department 12 and strand 10 and at strand 10
Segregation and cavity is produced at central part.
Fig. 2 is the schematic sectional of the slighter compress device 120 that the horizontal stripes 17 of continuous casting equipment 100 is possessed
Figure.Slighter compress device 120 has by arrange in the way of strand 10 is relative in the vertical direction a pair
Slighter compress roller 50,60 and by bearing 72,82 by slighter compress roller 50,60 support for rotating
Support 70,80.
In fig. 2 it is shown that the axis of the rotary shaft comprising slighter compress roller 50 of slighter compress roller 50 (rotates
Axis C) axial cross section.That is, shown in figure 2 is light to cut in the way of rotation axis C
The cross section of the slighter compress roller 50 depressing roller 50 and obtain.The outer surface of slighter compress roller 50 is upper strand 10
Side contacts with the upper surface of strand 10.The outer surface of slighter compress roller 60 is at the downside of strand 10 and strand
The lower surface contact of 10.It is linked with prelum 74 at the support 70 being used for supporting slighter compress roller 50.Adding
Under the effect of depressor 74, depress downwards slighter compress roller 50 by support 70.On the other hand, slighter compress
Roller 60 supported portion 80 supports as rotating, and limits strand 10 movement downwards.Therefore, logical
Crossing the pressure of slighter compress roller 50, strand 10 is by slighter compress.Hydraulic cylinder or electro-motor etc. can be used
As prelum 74.
Slighter compress roller 50 has convex surface, and has the periphery that diameter diminishes until end 54 from pars intermedia 53
Shape.That is, slighter compress roller 50 has the diameter of the pair of end portions 54 to arrange in the way of pars intermedia 53
The peripheral shape that D1 is less than the diameter D2 of pars intermedia 53.Between pars intermedia 53 and pair of end portions 54 respectively
It is formed with the bending section 56 that diameter changes continuously.Observe as shown in Figure 2, comprise slighter compress
During the cross section of the rotation axis C (central axis C) of roller 50, the periphery of pars intermedia 53 and end 54 is straight
Wire.On the other hand, the periphery of bending section 56 is curve-like.The diameter D2 of pars intermedia 53 is e.g.
300mm～400mm.Diameter D1 e.g. 250mm～350mm of end 54.Pars intermedia 53 straight
Difference (D2-D1) e.g. 10mm～80mm of footpath D2 and the diameter D1 of end 54.
Slighter compress roller 50 is supported at least some of and pars intermedia 53 of the outer surface of bending section 56
Outer surface can contact with strand 10.On the other hand, the outer surface at both ends 54 can not be with strand
10 contacts.At least some of and the periphery of pars intermedia 53 of the outer surface of the bending section 56 of slighter compress roller 50
Surface and the upper surface of strand 10, strand 10 is by slighter compress.By slighter compress, upper at strand 10
Surface forms the recess 13 with the shape corresponding with the peripheral shape of slighter compress roller 50.That is, strand 10
Recess 13 there is the shape complementary relative to the outer surface of the slighter compress roller 50 contacted with strand 10.Energy
Enough executed by the change length radially of pars intermedia 53, the diameter of pars intermedia 53 or prelum 74
The size etc. of the pressure added, size and shape to recess 13 are controlled.
Additionally, the cross section that the sectional view of Fig. 2 obtains when showing and cut along the II-II line cross section in Fig. 1.
But, for convenience of description, the not shown support of Fig. 1 70,80, bearing 72,82 and prelum
74。
Fig. 3 is the axonometric chart of slighter compress roller 50.The diameter at the both ends 54 of slighter compress roller 50 is than pars intermedia 53
Diameter little.Diameter it is formed with from pars intermedia 53 side towards end between pars intermedia 53 and pair of end portions 54
The bending section 56,56 being gradually reduced is removed in 54 sides.
Fig. 4 is contacting of in the cross section shown in enlarged representation Fig. 2, the strand 10 slighter compress roller 50 with upside
The sectional view of the local (near bending section 56) of part.Fig. 4 is also shown for comprising the rotation of slighter compress roller 50
Shaft axis C, the axial cross section of slighter compress roller 50.That is, Fig. 4 is that enlarged representation is with through rotation axis C
Mode cut slighter compress roller 50 and the figure of the local in cross section that obtains.Figure 4 illustrates one end 54
Near the bending section 56 of side, but the bending section 56 of side, the other end 54 is also of similar shape, and
Similarly contact with strand 10.
Slighter compress roller 50 is at the periphery of the periphery of a part for bending section 56 and pars intermedia 53 and strand 10
Upper surface 90a contacts.On the other hand, the periphery of the end 54 of slighter compress roller 50 not with the upper table of strand 10
Face 90a contacts.That is, have between the end 54 and the upper surface 90a of strand 10 of slighter compress roller 50 predetermined
Gap.The part being between pars intermedia 53 and end 54 of the periphery of slighter compress roller 50 is in side, end 54
There is the 1st circular arc 51, in pars intermedia 53 side, there is the 2nd circular arc 52.1st circular arc the 51 and the 2nd circular arc 52 with to
The mode that mutually opposite direction bloats is formed.
1st circular arc 51 bloats towards the rotation axis C of slighter compress roller 50, and the 2nd circular arc 52 is towards strand 10 side
Bloat.1st circular arc 51 be the center of circle be a part for the circumference of P1, the 2nd circular arc 52 be the center of circle be the circumference of P2
A part.The center of circle P1 of the 1st circular arc 51 is positioned at strand 10 side, and the center of circle P2 of the 2nd circular arc 52 is positioned at light pressure
In lower roll 50.The tangent line A tangent with both the 1st circular arc the 51 and the 2nd circular arcs 52 is as shown in Figure 4
The cross section comprising rotation axis C is intersected with rotation axis C.Tangent line A and rotation axis C angulation θ
It it is less than 40 °.This angle, θ the most both can be less than 35 °, it is also possible to is less than 30 °.Angle, θ with
Strand 10, upper surface 90a at end 54 roughly the same with tangent line A angulation.By reducing angle
Degree θ, it is possible to make recess 13 side be inclined nearly to horizontal direction.
If not moving the intersection point of tangent line A and rotation axis C and making angle, θ too small, during slighter compress, strand
10 increase with the contact area of slighter compress roller 50.Accordingly, it would be desirable to bigger light depression force, prelum 74 is deposited
In the trend maximized.In this case, the cost that there is prelum 74 increases and due to space
Restrict and the trend of increase in the man-hour of the maintenance of prelum 74.From this point of view, angle, θ is preferred
Be more than 15 °, more preferably more than 20 °.
The periphery of bending section 56 has flex point E between the 1st circular arc the 51 and the 2nd circular arc 52.Flex point E is positioned at cuts
On line A.The periphery of bending section 56 both can have straight line portion between the 1st circular arc the 51 and the 2nd circular arc 52,
The 1st circular arc 51 can also be made to be continuously formed with the 2nd circular arc 52.The periphery of bending section 56 can be only by the 1st
Circular arc the 51 and the 2nd circular arc 52 is constituted.
Preferably, the big (R2 of radius of curvature R 1 of radius of curvature R 2 to the 1 circular arc 51 of the 2nd circular arc 52
＞ R1).Thus, the nearly horizontal direction of the mitered of the side of recess 13, it is possible to when rolling further
The inner side of recess 13 is swung in suppression side.
Radius of curvature R 2 e.g. more than the 30mm of the 2nd circular arc 52.Radius of curvature R 2 e.g. 80mm with
Under.Radius of curvature R 1 e.g. below the 50mm of the 1st circular arc 51.It addition, radius of curvature R 1 is e.g.
More than 20mm.If radius of curvature R 1, R2 are excessive, during slighter compress, strand 10 and slighter compress roller 50
Contact area increases.Accordingly, it would be desirable to bigger light depression force, there is the trend maximized in prelum 74.
In this case, the cost that there is prelum 74 increases and the prelum 74 due to the restriction in space
The trend that the man-hour safeguarded increases.
As shown in Figure 4, in the axial cross section that comprises rotation axis C, disk width Wd and roll body
The ratio (Wd/Wb) of width Wb can be such as 0.4～0.6.Here, disk width Wd is at figure
3 and cross section as shown in Figure 4 in, two of the periphery of the upper surface 90a of strand 10 and slighter compress roller 50
Length between intersection point.That is, the part contacted with strand 10 of slighter compress roller 50 along rotation axis C
Axial length.On the other hand, roll body width Wb is the axle along rotation axis C of slighter compress roller 50
To length.
The slighter compress roller 50 by use with above-mentioned peripheral shape is manufactured with continuous casting equipment
Strand 10 carry out slighter compress, it is possible to control the shape of recess 13 formed at the upper surface of strand 10.If
Use the slighter compress device 120 possessing slighter compress roller 50, then can suppress to be formed between bottom surface and side
Corner angle.I.e., it is possible to the corner of suppression recess 13 forms corner angle, and can be formed in bottom surface and side it
Between there is no the recess 13 of corner angle.It addition, recess 13 can be shaped to cone-shaped.I.e., it is possible to do
Become the shape going recess 13 gradually to widen towards outside from the centre of strand 10.Therefore, it is possible in rolling casting
During base, inner side is swung in the side being adequately suppressed recess, is adequately suppressed and produces on the surface of rolling stock
Defect.
In the manufacture method using the strand possessing slighter compress device 120, steel continuous casting equipment 100
In, have carry in the horizontal direction pull out downwards from mold 104 strand, while with light
Pressure roller 50,60 carries out the operation of slighter compress in the vertical direction to this strand.In this operation, joining
The outer surface of at least pars intermedia 53 in the outer surface of the slighter compress roller 50 being placed in the upside of strand 10,
Outer surface at 2nd circular arc 52 contacts with strand 10.Thus, strand 10, by slighter compress, forms recess
13.Furthermore, it is possible to add at the 1st circular arc 51 with the outer surface at flex point E or on the basis of this
At least some of mode contacted with strand 10 of outer surface carries out slighter compress.
In above-mentioned operation, have between periphery and the upper surface 90a of strand 10 of end 54 predetermined between
Every.By carrying out the slighter compress of strand 10 while maintaining such interval, it is possible to be adequately suppressed casting
Segregation and cavity is produced at the central part of base 10.
The slighter compress roller 60 of the downside being arranged at strand 10 can use the roller of common cylindrical shape.Light pressure
The periphery of lower roll 60 contacts with the lower surface of strand 10.In the present embodiment, the upside at strand 10 sets
Put slighter compress roller 50, slighter compress roller 60 is set in the downside of strand 10, but is not limited to this.Such as,
Slighter compress roller 50,50 can be set in both the upper side and lower side of strand 10.Furthermore it is possible at strand
The downside of 10 arranges slighter compress roller 50, arranges slighter compress roller 60 in the upside of strand 10.
Fig. 5 is the figure showing schematically the cross section of strand 10 using slighter compress device 120 and obtain.Casting
Base 10 has by the outer surface and bending section 56 with the pars intermedia 53 of slighter compress roller 50 at upper surface
The outer surface contact of local and the recess 13 that formed.Recess 13 has and the pars intermedia of slighter compress roller 50
The shape that the outer surface of the outer surface of 53 and the local of bending section 56 is corresponding.Recess 13 be positioned at the end
Position between face 13a and side 13b becomes curved surface, does not has corner angle.It addition, a pair side of recess 13
Interval between 13b becomes big along with going upward.Owing to recess 13 is such shape, so energy
Enough suppression side 13b when rolling swings to the inner side of recess 13.Thereby, it is possible to suppression is at rolling stock
Surface produces defect.
This concludes the description of the present invention preferred embodiment, but the present invention is not limited to above-mentioned
Embodiment.Such as, recess 13 can be formed at both the upper side and lower side of strand.It addition, end
The diameter D1 of 54 can be non-constant along rotation axis C direction, and diameter D1 can be along with away from pars intermedia 53
And diminish.
[embodiment]
Hereinafter, with reference to embodiment and comparative example, present disclosure is described in detail, but
The present invention is not limited to following embodiment.
(embodiment 1)
Use continuous casting equipment as shown in Figure 1, manufactured thickness be 300mm, width be 400mm
Strand (bloom (English: bloom mold)).In continuous casting equipment, it is configured with 8 Fig. 2
As shown in slighter compress device 120.The ratio of the disk width Wd and roll body width Wb of slighter compress roller 50
(Wd/Wb) it is 0.5.It addition, the diameter D2 of pars intermedia 53 is set to 330mm, will be across centre
The diameter D1 of the pair of end portions 54 in portion 53 is set to 300mm.The 1st circle at the bending section 56 of slighter compress roller 50
The radius of curvature R 1 of arc 51 is become with rotation axis C with radius of curvature R 2 and the tangent line A of the 2nd circular arc 52
Angle, θ be set as shown in table 1.
Use cutting machine that the strand manufactured is cut into predetermined length, make 10 examinations to be evaluated
Sample.After sample to be evaluated being heated with heating furnace, use and the most alternately use barrel roll and indulge
Roller carries out the roll mill rolled, and is manufactured that the steel billet of a length of 150mm.With rod line roll mill to this steel
Base rolls, and is manufactured that bar steel (φ: 200～100mm) and wire rod (φ: 5.5mm),
Amount to 10.By range estimation, the surface of bar steel and wire rod is checked, obtained generation by recess 13
The ratio of the defect caused.It is shown in Table 1 result.
Use the above-mentioned sample to be evaluated made, by below step, core is had
Segregation-free is evaluated.Examination to be evaluated is cut through the face vertical with the circulating direction of sample to be evaluated
Sample, has obtained sample for evaluation as shown in Figure 8.Fig. 8 shows the cross section of sample for evaluation.?
In cross section as shown in Figure 8, comprising cornerwise intersection point and by intersection point and each summit phase
The position at the midpoint of each line segment linked (position 20 in Fig. 8, position 20a, position 20b, position 20c,
Position 20d this at 5) place, use drill bit (bit diameter: 5mm) to acquire strand chip.By combustion
Burn infrared absorption and determine the concentration of carbon of respective strand chip.
The concentration of carbon of position 20 is set to C, putting down these 4 concentration of carbons of position 20a, 20b, 20c, 20d
Average is set to C0, has obtained the value of ratio (C/C0).Concentration of carbon C according to 10 samples and carbon
The result of meansigma methods C0 of concentration, has obtained Σ (C/C0).The value of Σ (C/C0)/10 is defined
Degree of segregation for concentration of carbon.The situation that the degree of segregation of concentration of carbon is less than 1.1 is evaluated as "None" segregation,
By bigger than 1.1 for concentration of carbon degree of segregation and be less than 1.2 situation be evaluated as " having a little " segregation, by carbon
The situation that the degree of segregation of concentration is bigger than 1.2 is evaluated as " having " segregation.It is shown in Table 1 result.
(embodiment 2～8, comparative example 1～6)
Except changing the curvature half of radius of curvature R the 1 and the 2nd circular arc 52 of the 1st circular arc 51 as shown in table 1 like that
Beyond R2 and tangent line A and rotation axis C angulation θ, manufacture strand same as in Example 1ly,
Carry out the evaluation of sample.It is shown in Table 1 result.
[table 1]
| θ | R1(mm) | R2(mm) | The generation rate (%) of defect | There is segregation-free | |
| Embodiment 1 | 15° | 60 | 110 | 0 | Have a little |
| Embodiment 2 | 20° | 50 | 80 | 0 | Nothing |
| Embodiment 3 | 30° | 40 | 80 | 0 | Nothing |
| Embodiment 4 | 35° | 30 | 70 | 0 | Nothing |
| Embodiment 5 | 40° | 25 | 80 | 0 | Nothing |
| Embodiment 6 | 40° | 20 | 30 | 0 | Nothing |
| Embodiment 7 | 40° | 30 | 20 | 10 | Nothing |
| Embodiment 8 | 40° | 20 | 20 | 10 | Nothing |
| Comparative example 1 | 45° | 15 | 15 | 20 | Nothing |
| Comparative example 2 | 45° | 20 | 30 | 20 | Nothing |
| Comparative example 3 | 50° | 10 | 10 | 25 | Nothing |
| Comparative example 4 | 55° | 8 | 20 | 40 | Nothing |
| Comparative example 5 | 60° | 5 | 10 | 45 | Nothing |
| Comparative example 6 | 60° | 5 | 5 | 70 | Nothing |
Confirm: by angle, θ being set to less than 40 °, the product of the defect of product can be reduced fully
Raw rate.Additionally, in embodiment 1, the core at strand occurs in that fraction of segregation, but produces
The quality of product is the level not having special problem.In embodiment 7,8, the generation rate of defect is 10%,
But the quality of product is the level not having special problem.
Claims (8)
1. a slighter compress roller, the diameter of its end is less than the diameter of pars intermedia, wherein,
When observing the cross section comprising rotation axis of slighter compress roller,
Periphery between above-mentioned pars intermedia and above-mentioned end has towards above-mentioned rotary shaft in above-mentioned end side
The 1st circular arc that line bloats, have towards in opposite direction with bloating of above-mentioned 1st circular arc in above-mentioned pars intermedia side
The 2nd circular arc that bloats of direction,
The tangent line tangent with above-mentioned 1st circular arc and above-mentioned both 2nd circular arcs and above-mentioned rotation axis are become
Angle be less than 40 °.
Slighter compress roller the most according to claim 1, wherein,
The radius of curvature of above-mentioned 2nd circular arc is bigger than the radius of curvature of above-mentioned 1st circular arc.
Slighter compress roller the most according to claim 1 and 2, wherein,
The radius of curvature of above-mentioned 2nd circular arc is more than 30mm.
Slighter compress roller the most according to claim 1 and 2, wherein,
The radius of curvature of above-mentioned 1st circular arc is below 50mm.
Slighter compress roller the most according to claim 1 and 2, wherein,
The radius of curvature of above-mentioned 2nd circular arc is below 80mm.
Slighter compress roller the most according to claim 1 and 2, wherein,
The radius of curvature of above-mentioned 1st circular arc is more than 20mm.
7. a slighter compress device, it is the slighter compress device for strand, wherein, this slighter compress device
Possess:
Pair of rolls, it is to arrange in the vertical direction in the way of above-mentioned strand is relative；
Support, above-mentioned roller is supported as rotating by it；And
Prelum, it carries out slighter compress by above-mentioned pair of rolls to above-mentioned strand,
At least one in above-mentioned pair of rolls is the slighter compress roller according to any one of claim 1～6.
8. a manufacture method for strand, it is the manufacture method of the strand using continuous casting equipment, its
In,
The manufacture method of this strand has on one side to carry in the horizontal direction and pulls out downwards from mold
Strand, while this strand being carried out slighter compress with the slighter compress roller according to any one of claim 1～6
Operation,
The periphery at least the above pars intermedia in above-mentioned operation, in the outer surface of above-mentioned slighter compress roller
Outer surface at surface and above-mentioned 2nd circular arc contacts with above-mentioned strand gently presses this strand
Under.
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| CN201510089773.6A CN105983668A (en) | 2015-02-27 | 2015-02-27 | Soft reduction roller, soft reduction device with same and manufacturing method of casting blank |
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| CN201510089773.6A CN105983668A (en) | 2015-02-27 | 2015-02-27 | Soft reduction roller, soft reduction device with same and manufacturing method of casting blank |
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Application publication date: 20161005 |