CN100540164C - A kind of plain-barreled roll rhomboidity rolling method - Google Patents
A kind of plain-barreled roll rhomboidity rolling method Download PDFInfo
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Abstract
A kind of plain-barreled roll rhomboidity rolling method belongs to technical field of steel rolling, is used to solve the problem that adopts the anapsid plain-barreled roll rolled piece to be carried out formation rolling.It is a raw material with the square cross-section continuous casting billet, rolling two steps of rolling and water chestnut-square groove are formed by the plain-barreled roll off-square, adopt first pass flat rolling in the rolling step of plain-barreled roll off-square, make rolled piece produce the off-square amount by control drafts and use tilting guide and guards, rolling through 4～8 passages, rolled piece increases progressively with the off-square amount and forms the rhombus section, enter the rolling step of water chestnut-square groove then, the rolling steps in sequence of water chestnut-square groove adopts diagonal angle square pass, diamond pass, diagonal angle square pass three passages rolling, obtains regular square cross-section rolled piece.Mentality of designing of the present invention and existing flat rolling method are reverse and go, and the ingenious off-square that utilizes rolled piece to produce in flat rolling makes rolled piece form the rhombus section, and then enter water chestnut-square groove and roll out square steel.This method has successfully solved rolled piece in the existing plain-barreled roll formation rolling technology and has produced askew, as to fall a steel difficult problem.
Description
Technical field
The present invention relates to a kind of steel rolling method, particularly the rough rolling step with the rolling square steel of square cross-section continuous casting billet and rolling bar, wire rod adopts plain-barreled roll to carry out the rolling method of off-square, belongs to technical field of steel rolling.
Background technology
Flat rolling is a kind of new rolling technique, and it is meant adopts the plain-barreled roll of anapsid that rolled piece is carried out formation rolling.The flat rolling technology all has the research report both at home and abroad from the eighties in last century, this technology is remarkable in aspect effects such as reduction rolling cost, raising milling train efficient and reduction required powers.The problem that existing flat rolling technology mainly exists is that owing to adopt plain-barreled roll not have the sidewall restriction, rolled piece is easy to generate crooked i.e. " off-square " and even the steel that falls in the operation of rolling.If the off-square amount is big, then be difficult to continue rolling.For addressing the above problem, in flat rolling, adopt methods such as connectivity guide plate, rolling guide, but still can produce " off-square ", and still can not effectively solve the problem of falling the steel so far, thereby extensively promoting the use of of flat rolling technology is restricted.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of off-square amount that rolled piece produces in flat rolling of utilizing and control is provided, make flat rolling go out the rhombus rolled piece, and then enter the plain-barreled roll rhomboidity rolling method that rolls out square rolled piece in a small amount of water chestnut-square groove.
The alleged problem of the present invention is solved by following technical scheme:
A kind of plain-barreled roll rhomboidity rolling method, its special feature is: it is a raw material with the square cross-section continuous casting billet, rolling two steps of rolling and water chestnut-square groove are formed by the plain-barreled roll off-square, adopt the anapsid flat rolling in the rolling step of described plain-barreled roll off-square, make rolled piece produce the off-square amount by control drafts and use tilting guide and guards, rolling through 4～8 passages, rolled piece increases progressively with the off-square amount and forms the rhombus section, enter the rolling step of water chestnut-square groove then, the rolling steps in sequence of described water chestnut-square groove adopts the diagonal angle square pass, diamond pass, square pass three passages in diagonal angle are rolling, obtain regular square cross-section rolled piece, rolling shape is identical with the shape of rolling piece of conventional groove rolling.
Above-mentioned plain-barreled roll rhomboidity rolling method, off-square amount computational methods are as follows in the rolling step of described plain-barreled roll off-square:
A. determine the rolling passage of plain-barreled roll off-square and the drift angle that enters the rolling preceding rolled piece rhombus section of water chestnut-square groove, the length of side and total off-square amount W according to supplied materials size and mill capacity
Always,
B. just allocate rolling each percentage pass reduction of roller off-square (Ho-H)/Ho, drafts Ho-H with reference to milling train pair rolling parameter, and calculate the actual off-square amount of each passage W
Real, W
Real=W
Change+ W, wherein W
ChangeBe the off-square amount that last a time off-square calculates through formula (1) conversion after rolling, W be the off-square amount of this passage through formula (2) calculating,
W
Change=B/ (H
2+ W
2)
1/2* W------(1)
W＝2.29242+0.64132(Bo/Ho)-1.21232(a/Bo)+0.36243(Bo/Ho)
2+1.88675(Bo/Ho)(a/Bo)-17.52136(Bo/Ho)(a/Bo)
2+12.84316(a/Bo)
2+0.10054(Ho-H)/Ho-0.00129((Ho-H)/Ho)(Bo/Ho)-7.39316(Bo/Ho)(a/Bo)(Ho-H)/Ho+5.41919(a/Bo)(Ho-H)/Ho------(2)
In the formula: the Bo-rolled piece rolls preceding width; The Ho-rolled piece rolls preceding height; The H-rolled piece rolls the back height; The cydariform height of rolled piece before each passage of a-is rolled, at the first passage a=0, other passage a=17.5 * (Ho-H)/and Ho, the rolled piece width after B-rolls, B is by formula (B-B
0)=β * (H
0-determine that H) β is a ceofficient of spread, the value of β provides with reference to general flat rolling experience: β=(1+0.8) * (2L/ (Ho+2Bo)) * ((Ho-H)/Ho)
In the formula: the L-asynchronous region length, L=(R * (Ho-H))
1/2The R-roller radius;
C. pass through aforementioned calculation, if the inferior W of the rolling extreme trace of plain-barreled roll off-square
RealWith W
AlwaysInconsistent, then adjust each percentage pass reduction or drafts and calculate again, till both conform to, and the reduction ratio of determining according to result of calculation or drafts to carry out the plain-barreled roll off-square rolling.
Above-mentioned plain-barreled roll rhomboidity rolling method, described tilting guide and guards comprise inlet guide and guards and outlet guide device, wherein, and the off-square amount W that the tilt quantity M of each passage inlet guide and guards and this passage are calculated through conversion
ChangeConsistent and according to the inclination angle of this tilt quantity design entry guide and guards, the actual off-square amount of the tilt quantity M of outlet guide device and this passage W
RealConsistent and according to the inclination angle of this tilt quantity design outlet guide and guards.
Mentality of designing of the present invention and existing flat rolling method are reverse and go, the off-square that it utilizes rolled piece to produce in flat rolling, by control drafts and the special-purpose guide and guards of use, make rolled piece off-square amount controlled, be that rolled piece formation parallelogram is crooked, turn over another side of steel rolling then, so make after rolling rolled piece form the rhombus section, and then enter water chestnut-square groove again and roll out square steel through several passages.Plain-barreled roll rhomboidity rolling method is a raw material with the continuous casting billet of square cross-section, can be on continous way rolling mill and cross-arranging type rolling mill, rolling square steel or rolling as the roughing of rod, wire rod, it has solved, and rolled piece produces crooked, as to fall a steel difficult problem in the existing plain-barreled roll formation rolling technology, its major advantage is as follows: 1. can simplify Roller Machining, be convenient to roller management; 2. because without pass, be convenient to rolled piece and take off groove, reduce roll wear, improve roll service life; 3. increase the intensity of roll, improve the rebuilding number of times; 4. during the conversion rolling specs, do not need to change roll and pass; 4. make full use of the barrel length of roll, prolong the roll life cycle; 5. deformation drag reduces, and required power reduces; 6. can avoid because guide and guards misaligns the rolling defect that causes.
Description of drawings
Fig. 1 is before rolled piece rolls and the height dimension figure after rolling;
Fig. 2 is the vertical view of rolled piece among Fig. 1;
Fig. 3 be rolled piece off-square amount and turn over steel after off-square amount schematic diagram;
Fig. 4 is a rolled piece cydariform schematic diagram;
Fig. 5 is the guide and guards schematic diagram;
Fig. 6 is a diamond-shaped cross-section rolled piece schematic diagram;
Fig. 7 is the rolling roll figure schematic diagram of open-train mill plain-barreled roll off-square.
W among the figure
zBe W
Change, promptly go up the off-square amount that a time off-square calculates through formula (1) conversion after rolling; 1,2,3,4 be followed successively by four rolling passages of plain-barreled roll off-square, 5,6,7 are followed successively by water chestnut---three passages that square groove is rolling.
The specific embodiment
The inventive method by the plain-barreled roll off-square rolling two steps of rolling and water chestnut-square groove form, in rolling step utilization of plain-barreled roll off-square and the off-square amount that in flat rolling, produces of control rolled piece, after several passages are rolling, make flat rolling go out rhombus section rolled piece, and then enter that water chestnut seldom---square groove rolls out the square cross-section rolled piece.This method is a raw material with the continuous casting billet of square cross-section, can implement on continous way rolling mill and cross-arranging type rolling mill, in order to rolling square steel or rolling as the roughing of rod, wire rod.Referring to Fig. 7, this is, 3 passage water chestnuts rolling through 4 passage plain-barreled roll off-squares---the roll schematic diagram that square groove is rolling on open-train mill.
Core technology of the present invention is in each rolling passage of plain-barreled roll off-square, accurately controls the off-square amount of rolled piece in each passage by control drafts and employing tilting guide and guards, and then makes rolled piece form the rhombus section of expection.Through repetition test, by detecting each relevant physical dimension of rolled piece and off-square amount, and carry out the computing formula that regression analysis obtains the off-square amount, according to this computing formula control drafts to detecting data, cooperate the use of tilting guide and guards, can make that the plain-barreled roll off-square is rolling to be achieved.Below in conjunction with a specific embodiment the inventive method is described in detail.
Supplied materials uses the continuous casting billet of 120mm * 120mm, and it is rolling to carry out 6 passage off-squares on open-train mill, referring to Fig. 6, forms drift angle and be about 116 ° after the rolling step of plain-barreled roll off-square, and the length of side is the rhombus rolled piece of 74.5mm.Determine that according to supplied materials size and mill capacity the plain-barreled roll off-square is rolling rolling through 6 passages, turn over steel after every rolling a time, off-square amount W after the 6th passage
AlwaysBe 32.2mm.Rolled piece enters the diagonal angle square groove then, shuts out square rolled piece, again through the side's of rolling out part behind a diamond pass and the diagonal angle square groove.
At first determine β: according to general rolling experience β value 0.3, all the other passages also get 0.3 according to general rolling experience.Choose β by experience and can simplify calculating, though some error can meet design requirement fully.The accurate Calculation of β value can draw with reference to following formula according to prior art:
β＝(1+0.8)×(2L/(Ho+2Bo))×((Ho-H)/Ho)
Referring to Fig. 1, Fig. 2, in the formula: the L-asynchronous region length, L=(R * (Ho-H))
1/2
The Ho-rolled piece rolls preceding height; The H-rolled piece rolls the back height; The Bo-rolled piece rolls preceding width, the R-roller radius.
Calculate the rolling off-square amount of each passage off-square then:
First passage: provide the drafts of 28mm according to experience, reduction ratio (Ho-H)/Ho is 23%, and supplied materials is 120mm * 120mm continuous casting square billet, and its cydariform is 0, and the ratio of width to height is 1.According to formula (2) W=2.29242+0.64132 (Bo/Ho)-1.21232 (a/Bo)+0.36243 (Bo/Ho)
2(a/Bo)-17.52136 (Bo/Ho) (a/Bo) for+1.88675 (Bo/Ho)
2+ 12.84316 (a/Bo)
2+ 0.10054 (Ho-H)/Ho-0.00129 ((Ho-H)/Ho) (Bo/Ho)-7.39316 (Bo/Ho) (a/Bo) (Ho-H)/Ho+5.41919 (a/Bo) (Ho-H)/Ho calculates W=3.3mm.Because of this passage W
Change=0, so W
Real=W.Referring to Fig. 3, following a time rolled piece turns over steel rolling for 90 °, turns over the off-square amount W behind the steel
ChangeCalculate according to formula (1): W
Change=B/ (H
2+ W
2)
1/2* W is 4.6mm, and B is by formula (B-B in following formula
0)=β * (H
0-H) being defined as 128.4mm, H is defined as 92mm by drafts.Aforementioned calculation precision as requested keeps a decimal (down together).First passage inlet guide and guards is according to the square cross-section design of routine, and tilt quantity is 0.Referring to Fig. 5, the section of outlet guide device should be complementary through the rolled piece section configuration of off-square after rolling with this passage, and tilt quantity M is identical with off-square amount W=3.3mm, exports inclination alpha=2.1 ° of guide and guards according to this tilt quantity design.
Second passage: provide the drafts of 25mm according to experience, reduction ratio is 19%, referring to Fig. 4, and the cydariform a=17.5 of supplied materials * (Ho-H)/and Ho=3.3mm, the ratio of width to height is 0.72.Calculate W=3.0mm according to formula (2).Need point out that utilize in the computational process of formula (2) in this passage and following each passage, because of turning over 90 ° of steel, so the Bo of this passage is the H of last a time, the Ho of this passage is the B of last a time, definite method of this passage B and H is with first passage.Consider the off-square amount that passage has produced, the actual off-square amount of this passage W
Real=W
Change+ W=4.6mm+3.0mm=7.6mm.Descend a time 90 degree to turn over steel rolling then, turn over the off-square amount W behind the steel
ChangeCalculate according to formula (1): W
Change=B/ (H
2+ W
2)
1/2* W is 7.3mm.The tilt quantity of second passage inlet guide and guard and the W of this passage
ChangeUnanimity, i.e. tilt quantity=4.6mm is according to inclination alpha=2.6 of this tilt quantity design entry guide and guards °.The actual off-square amount of the tilt quantity of outlet guide device and this passage W
RealUnanimity, i.e. tilt quantity=7.6mm.According to inclination alpha=4.2 of this tilt quantity design outlet guide and guards °.
The 3rd passage: provide the drafts of 20mm according to experience, reduction ratio is 20%, the cydariform a=17.5 of supplied materials * (Ho-H)/and Ho=3.5mm, the ratio of width to height is 1.04.Calculate W=3.4mm according to formula (2).Consider the off-square amount that passage has produced, the actual off-square amount of this passage W
Real=W
Change+ W=7.3mm+3.4mm=10.7mm.Descend a time 90 degree to turn over steel rolling then, turn over the off-square amount W behind the steel
ChangeCalculate W according to formula (1)
Change=B/ (H
2+ W
2)
1/2* W is 14.8mm.The tilt quantity of the 3rd passage inlet guide and guard and the W of this passage
ChangeUnanimity, i.e. tilt quantity=7.3mm is according to inclination alpha=4.3 of this tilt quantity design entry guide and guards °.The actual off-square amount of the tilt quantity of outlet guide device and this passage W
RealUnanimity, i.e. tilt quantity=10.7mm, inclination alpha=7.7 of the outlet guide device of designing according to this tilt quantity °.
Four-pass: provide the drafts of 25mm according to experience, reduction ratio is 23%, the cydariform a=17.5 of supplied materials * (Ho-H)/and Ho=4.0mm, the ratio of width to height is 0.73.Calculate W=3.0mm according to formula (2).Consider the off-square amount that passage has produced, the actual off-square amount of this passage W
Real=W
Change+ W=14.8mm+3.0mm=17.8mm.Descend a time 90 degree to turn over steel rolling then, turn over the off-square amount W behind the steel
ChangeCalculate W according to formula (1)
Change=B/ (H
2+ W
2)
1/2* W is 18.3mm.The tilt quantity of four-pass inlet guide and guard and the W of this passage
ChangeUnanimity, i.e. tilt quantity=14.8mm is according to inclination alpha=10.0 of this tilt quantity design entry guide and guards °.The actual off-square amount of the tilt quantity of outlet guide device and this passage W
RealUnanimity, i.e. tilt quantity=17.8mm designs inclination alpha=11.9 ° of outlet guide device according to this tilt quantity.
The 5th passage: provide the drafts of 20mm according to experience, reduction ratio is 23%, the cydariform a=17.5 of supplied materials * (Ho-H)/and Ho=4.0mm, the ratio of width to height is 0.97.Calculate W=3.3mm according to formula (2).Consider the off-square amount that passage has produced, the actual off-square amount of this passage W
Real=W
Change+ W=18.3mm+3.3mm=21.6mm.Descend a time 90 degree to turn over steel rolling then, turn over the off-square amount W behind the steel
ChangeCalculate W according to formula (1)
Change=B/ (H
2+ W
2)
1/2* W is 29.2mm.The tilt quantity of the 5th passage inlet guide and guards and the W of this passage
ChangeUnanimity, i.e. tilt quantity=18.3mm is according to inclination alpha=15.2 of this tilt quantity design entry guide and guards °.The actual off-square amount of the tilt quantity of outlet guide device and this passage W
RealUnanimity, i.e. tilt quantity=21.6mm is according to inclination alpha=17.9 of this tilt quantity design outlet guide and guards °.
The 6th passage: provide the drafts of 25mm according to experience, reduction ratio is 28%, the cydariform a=17.5 of supplied materials * (Ho-H)/and Ho=4.9mm, the ratio of width to height is 0.74.Calculate W=3.0mm according to formula (2).Consider the off-square amount that passage has produced, the actual off-square amount of this passage W
Real=W
Change+ W=29.2mm+3.0mm=32.2mm.The tilt quantity of the 6th passage inlet guide and guards and the W of this passage
ChangeUnanimity, i.e. tilt quantity=29.2mm designs inclination alpha=24.0 ° of inlet guide and guards according to this tilt quantity.The actual off-square amount of the tilt quantity of outlet guide device and this passage W
RealUnanimity, i.e. tilt quantity=32.2mm is according to inclination alpha=26.2 of this tilt quantity design outlet guide and guards °.
Aforementioned calculation can program and be calculated by computer, and the relevant data of aforementioned calculation process can be referring to following table:
Table 1 rolling deformation and off-square amount data
Table 2 workpiece measurement
Determine drafts, reduction ratio according to aforementioned calculation, it is rolling to carry out the plain-barreled roll off-square.Rolling through 6 passages can roll out the rhombus rolled piece as Fig. 6.The off-square amount of rolled piece is 32.2mm, and the length of side is 74.5mm, 116 ° of drift angles.
And then it is rolling to enter water chestnut-square groove, and water chestnut-square groove is rolling to be that milling method according to the conventional pass of prior art is rolled, and does not have other specific (special) requirements.Rolled piece is introduced into the diagonal angle square groove that the length of side is 85mm in this example, and drafts is 41.4mm, and ceofficient of spread is 0.16, and the broadening amount is 6.6mm, and the width of diagonal angle side's rolled piece is 85.4mm.To enter diamond hole rolling for rolled piece then, and the diagonal angle drafts is 25mm, and rolling the back highly is 60mm.Ceofficient of spread is 0.4, and the broadening amount is 10mm, and the long-diagonal of gained rhombus is 95mm.This rhombus rolled piece upset enters diagonal angle side's final pasxs for 90 ° more then, rolls out the square steel that the length of side is 65mm.
If this example is carried out on continuous rolling mill, also be that the first six passage adopts the plain-barreled roll off-square rolling, back three passages adopt water chestnut-square groove rolling, each passage calculation of parameter and control are the same, for Ping-Li alternative expression tandem mill, because the milling train of front and back reverses relatively, rolled piece does not overturn in the operation of rolling, and rolling with above-mentioned open-train mill is identical.
Claims (3)
1. plain-barreled roll rhomboidity rolling method, it is characterized in that: it is a raw material with the square cross-section continuous casting billet, rolling two steps of rolling and water chestnut-square groove are formed by the plain-barreled roll off-square, adopt the anapsid flat rolling in the rolling step of described plain-barreled roll off-square, make rolled piece produce the off-square amount by control drafts and use tilting guide and guards, rolling through 4～8 passages, rolled piece increases progressively with the off-square amount and forms the rhombus section, enter the rolling step of water chestnut-square groove then, the rolling steps in sequence of described water chestnut-square groove adopts the diagonal angle square pass, diamond pass, square pass three passages in diagonal angle are rolling, obtain regular square cross-section rolled piece.
2. plain-barreled roll rhomboidity rolling method according to claim 1 is characterized in that: off-square amount computational methods are as follows in the rolling step of described plain-barreled roll off-square:
A. determine the rolling passage of plain-barreled roll off-square and the drift angle that enters the rolling preceding rolled piece rhombus section of water chestnut-square groove, the length of side and total off-square amount W according to supplied materials size and mill capacity
Always
B. just allocate rolling each percentage pass reduction of roller off-square (Ho-H)/Ho, drafts Ho-H with reference to milling train pair rolling parameter, and calculate the actual off-square amount of each passage W
Real, W
Real=W
Change+ W, wherein W
ChangeBe the off-square amount that last a time off-square calculates through formula (1) conversion after rolling, W be the off-square amount of this passage through formula (2) calculating,
W
Change=B/ (H
2+ W
2)
1/2* W------------(1)
W＝2.29242+0.64132(Bo/Ho)-1.21232(a/Bo)+0.36243(Bo/Ho)
2+1.88675(Bo/Ho)
(a/Bo)-17.52136(Bo/Ho)(a/Bo)
2+12.84316(a/Bo)
2+0.10054(Ho-H)/Ho-0.00
129((Ho-H)/Ho)(Bo/Ho)-7.39316(Bo/Ho)(a/Bo)(Ho-H)/Ho+5.41919(a/Bo)
(Ho-H)/Ho------(2)
In the formula: the Bo-rolled piece rolls preceding width; The Ho-rolled piece rolls preceding height; The H-rolled piece rolls the back height; The cydariform height of rolled piece before each passage of a-is rolled, at the first passage a=0, other passage a=17.5 * (Ho-H)/and Ho, the rolled piece width after B-rolls, B is by formula (B-B
0)=β * (H
0-determine that H) β is a ceofficient of spread, the value of β provides with reference to general flat rolling experience: β=(1+0.8) * (2L/ (Ho+2Bo)) * ((Ho-H)/Ho)
In the formula: the L-asynchronous region length, L=(R * (Ho-H))
1/2The R-roller radius;
C. pass through aforementioned calculation, if the inferior W of the rolling extreme trace of plain-barreled roll off-square
RealWith W
AlwaysInconsistent, then adjust each percentage pass reduction or drafts and calculate again, till both conform to, and the reduction ratio of determining according to result of calculation or drafts to carry out the plain-barreled roll off-square rolling.
3. plain-barreled roll rhomboidity rolling method according to claim 2 is characterized in that: described tilting guide and guards comprises inlet guide and guards and outlet guide device, wherein, and the off-square amount W that the tilt quantity M of each passage inlet guide and guards and this passage are calculated through conversion
ChangeUnanimity, according to the inclination angle of this tilt quantity design entry guide and guards, the actual off-square amount of the tilt quantity M of outlet guide device and this passage W
RealUnanimity is according to the inclination angle of this tilt quantity design outlet guide and guards.
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| CN102688883A (en) * | 2012-06-14 | 2012-09-26 | 南京钢铁股份有限公司 | Rolling technology for rolling mill with two reversible rollers |
| CN112288746B (en) * | 2020-12-28 | 2021-04-02 | 江苏金恒信息科技股份有限公司 | Machine vision-based off-square detection method and detection system |
| CN113351643B (en) * | 2021-04-23 | 2022-12-02 | 陕钢集团产业创新研究院有限公司 | Rolling method for rapidly switching 150 and 165 square billets in bar and wire steel rolling production |
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Non-Patent Citations (2)
| Title |
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| 平辊轧制矩形件脱方规律的研究. 刘战英.钢铁研究，第2期. 1996 |
| 平辊轧制矩形件脱方规律的研究. 刘战英.钢铁研究，第2期. 1996 * |
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