CN101554635B - Method for configuring shape of supporting roll of four-high mill and shape of working roll thereof - Google Patents
Method for configuring shape of supporting roll of four-high mill and shape of working roll thereof Download PDFInfo
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Abstract
The invention relates to a method for configuring the shape of a supporting roll of a four-high mill and the shape of a working roll thereof, belonging to the technical field of steel rolling. According to three types of width specifications of band steel which are most rolled by hot-rolling band steel production line, sixth-power polynomial supporting roll shape technology and second-power working roll shape curve are used for configuration so as to lead the contact length of the supporting roll and the working roll and the width of the rolled band steel to be fit. The method has the advantages of eliminating hazardous contact areas in which the parts of the two ends of the supporting roll with the flat roll shape and the working roll expand out of the edge of the band steel to generate large deflection and deformation, solving the problems that the stress concentration of the edges of the supporting roll and the working roll in a hot continuous mill for wide band steel causes stripping and the mill roll with the flat roll shape has large wearing capacity and is not even, reducing the consumption of the mill rill, saving energy, reducing consumption and reducing cost for rolling steel; and by the technical configuration of R2 working roll shape and the supporting roll shape, the invention solves the plate-shape problems that the middle blank generates negative convexity and the wedge shape is large, and improves the control precision of the shape of hot-rolled band steel.
Description
Technical field
The invention belongs to technical field of steel rolling, particularly relate to the method for a kind of shape of supporting roll of four-high mill and shape of working roll configuration.Solve wide steel strip hot tandem rolling roller of four-high rougher peel off and improve in the middle of blanket shape support roller roll forming technology and with the technology of shape of working roll configuration, be specially adapted to solve roll owing to contact stress between roller and concentrate the spalling of rolls that causes, improve the middle blanket shape of the hot rolled strip operation of rolling, improve the hot-strip strip shape quality.
Background technology
The strip material is widely used in the every aspect of industry, agricultural, national defence and daily life, plays an important role in the national economic development.Continuous hot-rolling mill is that the mode of the steel billet of certain size and chemical analysis by calendering is processed into the equipment of desired certain thickness and width specifications band coil of strip, and the important ring in the production procedure of strip steel also is the research focus in rolling field always.
The roll for hot-rolling work under bad environment, hot roll often is operated in 700 ℃～800 ℃ hot environment, contact with scorching hot steel billet, need bear powerful roll-force, the brute force wearing and tearing of stocking will be born in the surface simultaneously, heated and water quench by hot rolling material repeatedly, stand the bigger heat fatigue effect of range of temperature.This just requires the hot roll material must have high quenching degree, low thermal coefficient of expansion, high capacity of heat transmission and high high-temperature yield strength and high non-oxidizability.According to statistics, in China Metallurgical Enterprise user's roller consumption, have 35%～50% all to belong to unproductive consumption, that is to say, the roll of annual nearly half quantity that is consumed in the whole nation is not the productivity consumption of normal steel rolling, but because of various rolling accidents, as steel-fastening, roll breakage, peel off, lose flesh, collars breaks off with the fingers and thumb and the unusual consumption part that accident caused such as splits.The unproductive consumption ratio of roll high also caused problems such as the rolling difficulty of low, the high-grade stocking of operating rate of rolling mill, roll update cost be excessive, thereby influenced the production efficiency of rolling line.
Along with science and technology development, the particularly develop rapidly of some modernized industrial departments such as automobile, system jar and household electric appliances etc., not only the demand to the strip material sharply increases, and its quality, dimensional accuracy, surface quality and performance have been proposed strict requirement.Thickness and precision of strip (vertical thick difference and lateral thickness difference) and plate shape (section configuration and flatness) are two important indicators weighing strip material geometric accuracy.Particularly produce for the strip material of China, annual very serious by the loss of the bad economic aspect that causes of plate shape.The strip shape quality that improves hot-strip can reduce the additional process of bringing owing to deformation in the use of band steel, enhances productivity.In the face of fierce competitive market, the strip shape quality that improves hot-strip simultaneously also can be so that hot-strip manufacturer sits pretty.So, solve strip produce in the strip shape quality problem be one and have the tremendous economic meaning and have very important social effect.
Domestic most of hot rolling factory roughing unit is a four-high mill, and support roller and working roll adopt plain-barreled roll shape mostly, and support roller limit portion is chamfering just also.Because roughing four-high mill support roller and working roll adopt plain-barreled roll shape mostly; support roller or working roll peel off in the easy occurrence of large-area of limit portion in the steel rolling production process; cause produce shutting down, roll is scrapped in advance or the roller consumption increases severely, and causes bigger economic loss.Simultaneously, adopt plain-barreled roll shape, cause occurring after intermediate blank is rolled in the operation of rolling negative convexity, wedge shape and camber problem and cause finish rolling plate shape control difficulty to increase the reduction of plate shape control accuracy hit rate.
Solve the broad strip mill roll and concentrate the problem of peeling off that causes owing to contact stress between roller, domestic correlative study has concentrated on the correlative study that how to improve roll material and manufacturing process aspect thereof mostly.As number of patent application: 200510038980.5, name is called composite high-speed steel roller and preparation method; Number of patent application: 02138774.5, name is called a kind of manufacturing process of compoiste adhering hard alloy roll; Number of patent application: 200610085881.7, name is called half high speed steel composite roller and preparation method; Number of patent application: 200610041705.3, a kind of low crack type high speed steel roll and centre spinning method thereof; Number of patent application: CN93100898.0, composite cast iron roller and casting method thereof; Number of patent application: 200710017612.1, a kind of high-carbon high-high-vanadium high-speed steel composite roller and heat treatment method thereof.In addition, use and management aspect, accomplish that the accident of peeling off of control as far as possible takes place, relevant research is arranged too from roll, as the patent No.: 200810052212.9, a kind of method of recovering to improve hot roll and cold rolling help roll service life.
Slave plate shape control aspect is mainly studied focus and has been concentrated on mm finishing mill unit support roller and working roll structure and roll forming thereof, as plate shape control improvement means, as roll formings such as CVC, HC, SmartCrown, PC, UPC, HVC.The support roller aspect is still based on conventional support roller (plain-barreled roll or parabola roll forming).(VCL, VCR) technology can not change existing rolling mill structure and not influence under the condition of production the change contact length support roller of plate shape control seminar of University of Science ﹠ Technology, Beijing independent development, solves the problem of unit plate shape ability of regulation and control deficiency.This roll forming has also just obtained application in mm finishing mill unit, does not also promote at the roughing unit.In recent years, at roll, especially the configuration aspects of support roller also has a lot of novel product and patents, as dynamic support roller technology, the DSR (Dynamic Shape roll) of Zurich, Switzerland S-ES company exploitation NIPCO stairstepping support roller, French CLECIM company also has been successfully applied to industrial production, but its complex structure, the cost height is difficult for promoting on conventional milling train.The domestic patent No.: 96103393.2, a kind of backing roll of continuously variable supporting width also is the innovation that belongs to the support roller structure, equally also is complex structure, the cost height.
Support roller is a kind of a kind of effective means that roll shop building contacts the pressure distribution homogenising that solve with the shape of working roll technology with the roll forming configuration.Mostly the four-high rougher of broad hot strip production line also rests on the stage of using plain-barreled roll shape, the time have the spalling of rolls accident to take place, cause bigger economic loss.So, the production technology that is necessary to improve the support roller and the shape of working roll of roughing unit and is configured into this backwardness.Owing to this support roller and shape of working roll technology and configuration can be carried out not changing existing rolling mill structure and do not influence under the condition of production, to invest for a short time, instant effect has remarkable economic efficiency and social effect.
Goal of the invention
1) support roller and working roll are concentrated the problem of peeling off that causes in the solution wide steel strip hot continuous mill group owing to limit portion stress;
2) solve the big and uneven problem of roll wear amount, reduce roll consumption;
3) improve plate shape problems such as the negative convexity of intermediate blank, wedge shape are big, improve Hot Strip shape control accuracy.
Summary of the invention
The method that the object of the present invention is to provide a kind of shape of supporting roll of four-high mill and dispose with shape of working roll, the problem of solution is:
1) eliminated plain-barreled roll shape support roller and working roll and produced big harmful contact area of disturbing bent distortion in the part that is exceeding the strip edge edge at two ends, solved in the wide steel strip hot continuous mill group support roller with working roll because the concentrated problem of peeling off that causes of limit portion stress;
2) solve the big and uneven problem of plain-barreled roll shape roll wear amount, reduced roll consumption, energy-saving and cost-reducing, reduce the steel rolling cost;
3) by R2 shape of working roll and support roller roll forming technical configuration, solved and improved intermediate blank and produce and bear plate shape problems such as convexity, wedge shape are big, improved Hot Strip shape control accuracy.
The thinking of this invention is: on plain-barreled roll shape contact stress results of analysis, according to hot-rolled strip production line rolling three kinds of maximum strip width specifications, give the support roller roll shape curve that makes new advances, and with the shape of working roll phase configuration, make support roller and working roll contact length and institute roll strip width and adapt, solve roll limit portion because stress is concentrated and cause the problem of peeling off; Change the steel rolling poor stability that plain-barreled roll shape working roll causes, the slab sideslip is serious, causes the plate shape problem of a large amount of cambers, wedge shape and negative convexity.
Technical scheme of the present invention is:
According to hot-rolled strip production line rolling three kinds of maximum strip width specifications, use 6 power multinomial support roller roll forming technology and be configured, make support roller and working roll contact length roll strip width and adapt with institute with the shape of working roll curve of 2 powers:
The situation that the support roller and the working roll of roughing four-high mill all adopted plain-barreled roll shape: adopt 6 order polynomial curves to finish the smooth transition at roll limit portion and middle part, make support roller roller footpath have 0.4mm～2mm roller directly poor with the middle part in limit portion; According to the rolling load size, determine that the roller footpath of concrete needed 0.8mm～1.2mm is poor, design support roller high-order moment roll shape curve;
Working roll adopts negative roll forming, makes working roll have the negative convexity of 0.05～0.3mm, and the shape of working roll curve is a quadratic curve;
Behind given support roller and the shape of working roll curvilinear equation, need carry out the roll forming grinding of roll surface to support roller and working roll;
After finishing roll dressing preparation, in the hot rolling automation control system, provide corresponding support roller and shape of working roll curvilinear equation; , needing typing roll shape curve equation in the steel rolling second control system, the system that makes finishes compound the setting with the control of plate shape and calculates; In level two, before the typing equation, need carry out unit transformation to above-mentioned two roll shape curves and handle.
Principle of the present invention is as follows:
1, the support roller to the roughing four-high mill all adopts the situation of plain-barreled roll shape to carry out contacting between roller the theoretical analysis and calculation of stress with working roll.Show that according to analysis result it is the root (as shown in Figure 1) that fatigue crack produces that flat support roller and working roll are concentrated at limit portion formation contact stress, causes the generation of the problem of peeling off.Because stress concentrates the wear extent cause big and uneven, make under the roll that stock removal is big behind the machine, cause the roller consumption of steel rolling big, increased production cost, also be unfavorable for saving energy and reduce the cost.Simultaneously, plain-barreled roll shape support roller and working roll produce big harmful contact area of disturbing bent distortion at two ends in the part that exceeds the strip edge edge, unfavorable to the control of strip edge degradation plate shape, simultaneously also unfavorable to belt steel rolling stability, cause behind the slab rough rolling intermediate blank to produce plate shape problems such as negative convexity, wedge shape are big, cause finish rolling plate shape control accuracy not high.
2, support roller roll forming technology is the core content of this invention, according to hot-rolled strip production line rolling three kinds of maximum strip width specifications, adopt the high-order moment curve to finish the smooth transition at roll limit portion and middle part, make support roller roller footpath have 0.4mm～2mm roller footpath poor in limit portion and middle part.Roll maximum three kinds of rolled band steel width specifications according to rolling line,, then, according to the rolling load size, determine that the roller footpath of concrete needed 0.8mm～1.2mm is poor, design support roller high-order moment roll shape curve as roll forming design key point.
Support roller roll shape curve equation:
The roll shape curve equation is as follows, as shown in Figure 2:
R (x)=a
0+ a
1X+a
2x
2+ a
3x
3+ a
4x
4+ a
5x
5+ a
6x
6In the formula, x is the roll barrel axial coordinate, and the origin of coordinates is a body of roll mid point, unit: mm; R is a roller radius relative deviation amount, unit: um; a
6, a
5, a
4, a
3, a
2, a
1, a
0Be the coefficient from 6 times to constant term in the multinomial, scope is respectively:
a
6＝-3.6129709640*10
-16～-2.6756900092*10
-16；
a
5＝1.9459747028*10
-24～2.6756900092*10
-17；
a
4＝8.4465873947*10
-11～1.1209998557*10
-10；
a
3＝-2.2103822104*10
-11～-5.0453517503*10
-17；
a
2＝-1.1433660012*10
-4～-4.3095500441*10
-5；
a
1＝1.5616796745*10
-10～8.2423485419*10
-6；
a
0-8.6146187639*10
-3～2.5537538268*10
-3。
3, for blanket shape in the middle of controlling, improve after the roughing in the middle of blanket shape and camber, and help rolling stability, adopt negative roll forming at the working roll of roughing four-high mill.Make working roll have the negative convexity of 0.05～0.3mm, have good when strengthening slab rolling neutral and stable.
The shape of working roll equation:
The shape of working roll curve is a quadratic curve, as shown in Figure 3, and R
2(x)=b
0+ b
1X+b
2x
2, in the formula, x is the roll axial coordinate, the origin of coordinates is positioned at body of roll mid point, the mm of unit; R
2Be roller radius relative deviation amount, the um of unit.Coefficient scope in the multinomial:
b
2＝-1.5802470000*10
-4～-3.9505973672*10
-5；
b
1＝-1.9751881062*10
-3～-6.1062266354*10
-16；
b
0＝-2.4884545848*10
-2～-5.6843418861*10
-13。
4, the new roll shape curve of above-mentioned four-high mill support roller and working roll has been carried out contacting the pressure distribution analysis.The contact length of the support roller and working roll body of roll when 6 curve support roller of the present invention roll forming can change steel rolling, as shown in Figure 4, can significantly reduce roller and press the power kurtosis indirectly, make that the contact stress distribution is even between roller, as shown in Figure 5, effectively having alleviated contact pressure spike ground occurs.Adapt to institute's rolled band steel width and rolling load, eliminate the harmful contact zone of roll cantilever segment, make that contacting problem of stress concentration between support roller and working roll roller is solved, solve roll because the problem of peeling off that the harmful contact zone of limit portion causes is all useful to the life-span that prolongs support roller, working roll.
5, behind given support roller and the shape of working roll curvilinear equation, need carry out the roll forming grinding work of roll surface to support roller and working roll.In the typing of roll shape curve equation and management system of grinding machine, according to mode, carry out the multinomial coefficient typing of above-mentioned support roller and shape of working roll curve with polynomial equation, examine curvilinear equation convexity size and whether coincide with design curve.Carry out grinding program programming, select in the grinding program to the support roller of institute's grinding and working roll given roll shape curve equation, and in grinding program, be cured, support roller and working roll are carried out grinding.Roll forming error after the grinding will satisfy upward machine job requirement.Before the machine, need carry out the inspection of roll surface and roll forming on the support roller.
6 finish roll dressing preparation after, need in the hot rolling automation control system, provide corresponding support roller and shape of working roll curvilinear equation.Similar with the grinding management work, need typing roll shape curve equation in the steel rolling second control system, the system that makes finishes compound the setting with the control of plate shape and calculates.In level two, before the typing equation, need carry out unit transformation to above-mentioned two roll shape curves and handle.
1) body of roll coordinate is carried out regularization with body of roll medium position as the origin of coordinates, just make body of roll coordinate between [1 ,+1];
2) the ordinate unit to the roll forming curvilinear equation carries out conversion, and just the unit of roller radius difference value converts the unit that uses the roll forming parameter in the second-level model to;
3) the roll forming equation is carried out match again, obtain new function, the corresponding every coefficient of roll shape curve coding that is input to redetermination in the level two of polynomial every coefficient correspondence.
The work that need do when 7, changing roll:
1) when changing support roller and working roll, operating personnel's famous roll forming of the roll type on the roll change advice note between grinding roller;
When 2) the steel rolling operating personnel are in the HMIs of parameter in control system such as input roll numbering, diameter, must number that hurdle at the pairing roll forming of the roll of corresponding roll forming of the roll and choose the roll forming numbering that provides in advance.
8, finish above-mentioned work after, just can carry out steel rolling with new roll forming and configuration.Need carry out following DATA REASONING evaluation and improve effect:
1) the wearing and tearing roll forming behind the machine under the support roller;
When 2) changing working roll, observe the work roll surface situation;
3) the wearing and tearing roll forming behind the machine under the working roll;
4) work initial stage, mid-term and the latter stage of support roller and working roll the cross-sectional outling of rolling intermediate blank measure, provide board form datas such as convexity, wedge shape and camber;
5) mm finishing mill unit plate shape control result data is collected and analyzed;
6) carry out overall merit according to above-mentioned data result, give the result of use of make new advances roll forming and configuration thereof.
9, use 6 power multinomial support roller roll forming technology and be configured with the shape of working roll curve of 2 powers, can be used on the four-high rougher, its effect is:
1) solve roll and concentrate the problem of peeling off that causes because roller presses power indirectly, support roller wearing and tearing homogenising reduces the roller consumption;
2) improve the intermediate blank strip shape quality, improved the hit rate of Hot Strip shape control accuracy.
Patent innovative point of the present invention:
1) design 6 power polynomial curves are hot rolling unit pony roughing mill support roller roll forming, change the contact length of support roller and working roll, make this contact length and institute's rolled band steel width and payload adapt, solve the spalling of rolls problem that the concentrated crack Propagation that causes of stress in the harmful contact zone of roll limit portion finally causes.
2) 6 power multinomial support roller roll shape curves can be so that support roller and working roll roller press the power homogenising indirectly, and roll wear obtains homogenising, and the roll dressing amount reduces, and the roll loss reduces.
3) roughing R2 frame shape of working roll adopts negative convexity roll forming and the configuration of 6 power multinomial support roller roll shape curves, has increased the stability of rough rolling step steel rolling, improves strip shape qualities such as intermediate blank convexity and wedge shape, improves the control accuracy of Hot Strip shape.
4) adopt the configuration of 6 power support roller roll forming design curves and negative convexity shape of working roll, and be applied to Shoudu Iron and Steel Co 2160mm wide steel strip hot continuous rolling production line, effect is remarkable, has solved roughing R2 spalling of rolls and middle blanket shape control problem.
Economic implications of the present invention and social effect:
It is to go into operation the end of the year in 2006 that Shoudu Iron and Steel Co moves steel 2160 broad hot strip production lines, in the production process in years in 2007, the production accident that the roll roll surface of support roller on repeatedly roughing and the mm finishing mill unit and working roll peels off or ruptures and cause roll to be scrapped in advance at viability occurs, caused bigger economic loss.In 2008, after the smooth and easy production, the roll roll surface also repeatedly took place peel off and roll breakage accident, especially roughing R2 frame.And the plate shape control hit rate of band steel is also relatively low, needs further to improve.
Concentrate surfacial spalling problem and the middle blanket shape of control that causes in order to eliminate broad hot strip roll roller end contact stress, support roller roll forming technology and the secondary shape of working roll curve and the allocation plan thereof of six power polynomial curves researched and developed in design, moves on the steel 2160mm hot tandem rolling broad strip mill roughing R2 at Shoudu Iron and Steel Co and obtained successful Application.This invention support roller roll forming technology solve spalling of rolls, reduce the roller consumption, prolong roll service life, the technical research that improves aspects such as intermediate blank strip shape quality has novelty, and solving roll owing to obtained remarkable economic efficiency (owing to the direct economic loss that the spalling of rolls accident causes, accumulative total contrasts 5,640,000 yuan of economic benefits) aspect the concentrated problem of peeling off that causes of limit portion stress.The roll forming design and optimization need not equipment is dropped into, and cost is low, and effect is remarkable, and the hot continuous rolling production line of Shoudu Iron and Steel Corp. and other companies is had popularizing action, and this technology has the important social meaning.
Description of drawings
Roller pressed the power distribution indirectly when Fig. 1 R2 frame adopted plain-barreled roll shape.
Fig. 2 support roller roll forming design curve.
Fig. 3 R2 working roll design roll shape curve.
Fig. 4 designs the support roller roll forming and contacts schematic diagram with working roll.
Fig. 5 designs the support roller roll forming and working roll presses the power distribution indirectly.
The conventional support roller chamfering of Fig. 6 form.
Fig. 7 support roller roll forming is the wearing and tearing roll forming that plain-barreled roll shape is measured behind the machine at present.
Wearing and tearing roll forming result behind Fig. 8 R2 frame support roller employing design roll forming.
Fig. 9 uses this hardness ratio that designs roll forming front and back.
Figure 10 R2 uses the preceding intermediate blank plate shape measurement of negative roll forming.
Blanket shape result in the middle of behind the negative roll forming of Figure 11 R2 working roll employing design.
The wearing and tearing roll forming of working roll when Figure 12 support roller adopts plain-barreled roll shape, working roll employing plain-barreled roll.
Figure 13 R2 working roll adopts the following machine wearing and tearing roll forming behind the negative roll forming that designs.
The specific embodiment
It is to go into operation the end of the year in 2006 that Shoudu Iron and Steel Co moves steel 2160mm broad hot strip production line, in the production process in years in 2007, the production accident that the roll roll surface of support roller on repeatedly roughing and the mm finishing mill unit and working roll peels off or ruptures and cause roll to be scrapped in advance at viability occurs, caused bigger economic loss.In 2008, after the smooth and easy production, the roll roll surface also repeatedly took place peel off and roll breakage accident, especially roughing R2 frame.Because cooling rolls material and a large amount of camber feedback opinions occurs, and flatness defects such as shape wave, wedge shape are arranged, the plate shape control hit rate of band steel is also relatively low, needs further to improve.
Shoudu Iron and Steel Corp. moves steel 2160mm hot rolling unit in when design, and support roller does not adopt roll forming, employing be plain-barreled roll edged portion chamfering mode.The chamfering form generally has three kinds of forms: straight chamfering, stepped ramp type chamfering and circular arc type chamfering, limit portion chamfering form and parameter are as shown in Figure 6.What move that the support roller of the roughing of steel 2160mm hot rolling unit and mm finishing mill unit all adopts in the time of design is the third form, A=200mm, B=2mm.The roughing working roll does not adopt roll forming too, is plain-barreled roll.
Plain-barreled roll shape has been carried out contacting between roller stress distribution carried out analytical calculation, found out the reason that roll limit portion peels off, and carried out repeatedly intermediate blank plate shape measurement.Pony roughing mill support roller and shape of working roll improvement and application work have been carried out in March, 2008.
Since in March, 2008 Shoudu Iron and Steel Co move use this design roll forming on the R2 frame on the steel 2160mm wide steel strip hot continuous rolling production line after, the situation that frequent in the past generation support roller and working roll roll surface peel off has obtained reverse, after bringing into use this support roller roll forming technology, just the roll roll surface did not take place peels off accident.In the mm finishing mill unit, along with the application of this support roller roll forming, also rare basically recurrent working roll roll surface in the past peels off problem.This also can find out the superiority of this support roller roll forming technology from the following machine wear curve effect of using working roll limit portion surface appearance, case hardness test result and support roller and working roll before and after this support roller roll forming.
1) support roller wearing and tearing roll forming
As shown in Figure 7, roughing R2 and finishing stand support roller are the preceding roll shape curve of the mill of plain-barreled roll, that is to say wear curve.As can be seen from the figure, no matter be finishing stand or pony roughing mill, when adopting the plain-barreled roll support roller, the wearing and tearing of roll are very inhomogeneous, overall on wear curve be shaped as a box-shaped, produce very dark bigger local heavy wear in the edge of roll.The reason that directly causes this wear results is a contact stress distribution inequality between roller, in limit portion a stress spike is arranged, and causes roll limit portion serious wear, work hardening occurs.The self-sustaining ability of plain-barreled roll shape has increased roll limit portion and crackle occurred, and the danger of expansion, but also has reduced the ability of regulation and control of plate shape.
After adopting this design support roller roll forming, it is good that the roll forming under the support roller behind the machine keeps, and wearing and tearing have obtained homogenising, as shown in Figure 8, that is to say that the use of this support roller roll forming can improve the distribution of contact between support roller and working roll.
2) machine back portion situation is improved effect under the working roll
From above-mentioned two figure under the R2 frame working roll behind the machine in the contrast of roll limit portion form photo before and after this design support roller roll forming is used, can be clear that, when not using this support roller roll forming technology, about the 120mm of portion of distance roll limit, have a tangible width 15 to the crackle aggregation zone of 20mm, and after having used new support roller roll forming technology, no longer included this slit region.
Above-mentioned situation changes, and has proved that this support roller roll forming technology application on R2 frame support roller played key effect for solving support roller and the working roll limit portion problem of peeling off.This also is to have used since this support roller roll forming technology, and the problem that any limit portion peels off does not appear in the working roll working stability of R2.
3) support roller roll surface hardness is improved effect
Support roller is used before and after this support roller roll forming technology the measured hardness result of machine down, as shown in Figure 9, therefrom use this support roller roll forming as can be seen after, the case hardness of support roller has tangible reduction.After this showed this design roll forming of use, the distribution of contact of roll shop building had had good improvement, and stress is concentrated and controlled, and did not appear at roll limit portion basically and 70 hardness number occurred surpassing.This has proved that also this support roller roll forming technology can solve roll owing to contact stress is concentrated the accident of peeling off that causes, and respond well.
4) blanket shape is improved effect in the middle of
Because cooling rolls material and flatness defects such as a large amount of cambers, wedge shape occur, in order to improve above-mentioned two kinds of defectives, the intermediate blank base head at scene and the plate shape of base tail has been carried out actual measurement work.Measurement result shows the situation that the intermediate blank major part is negative convexity, wedge shape is bigger, and negative convexity and wedge shape reach-500um and 400um, as shown in figure 10.There is very big negative convexity in duration of work intermediate blank in R2 work, but also has this wedge shape, and early stage, wedge shape was bigger.This also is to cause with steel camber and the bigger reason of monolateral wave, makes belt plate shape control hit rate reduce.
Roughing R2 frame four-high mill adopts the support roller roll forming phase configuration in negative roll forming working roll and the technology contents 2 to use, and has improved the strip shape quality of intermediate blank, has avoided the intermediate blank flatness defect of negative convexity and big wedge shape.
Figure 11 is the intermediate blank plate shape measurement result of the negative roll forming of R2 in its use initial stage, mid-term and latter stage.From the result, thoroughly changed original have negative convexity and wedge shape when adopting plain-barreled roll shape come flitch shape.
5) working roller abrasion roll forming
As shown in figure 12, behind machine under the work of R2 frame employing plain-barreled roll shape working roll, the wearing and tearing roll forming exists the roll two ends inconsistent problem of wearing and tearing, just slab sideslip in roll gap is serious, cause serious wear on one side, an other end is lighter, and rolling stability is longer like this, and plate shape exists big wedge shape and negative convexity problem.Roughing R2 frame four-high mill adopts the support roller roll forming phase configuration in negative roll forming working roll and the technology contents 1 to use, and the wearing and tearing roll forming under the working roll behind the machine as shown in figure 13.With adopt early stage behind the plain-barreled roll down the machine roll forming relatively, negative roll forming roll wear roll forming symmetry is fine, can illustrate that the both sides roll wear is even, strip running deviation control effect is obvious, middle blanket shape obtains good control.
Claims (4)
1. the method for roughing shape of supporting roll of four-high mill and shape of working roll configuration, it is characterized in that, according to hot-rolled strip production line rolling three kinds of maximum strip width specifications, use 6 power multinomial support roller roll forming technology and be configured, make support roller and working roll contact length roll strip width and adapt with institute with the shape of working roll curve of 2 powers:
The situation that the support roller and the working roll of roughing four-high mill all adopted plain-barreled roll shape: adopt 6 order polynomial curves to finish the smooth transition at roll limit portion and middle part, make support roller roller footpath have 0.4mm～2mm roller directly poor with the middle part in limit portion; According to the rolling load size, design support roller 6 order polynomial roll shape curves;
Working roll adopts negative roll forming, makes working roll have the negative convexity of 0.05～0.3mm, and the shape of working roll curve is a quadratic curve;
Behind given support roller and the shape of working roll curvilinear equation, need carry out the roll forming grinding of roll surface to support roller and working roll;
After finishing roll dressing preparation, provide corresponding support roller and shape of working roll curvilinear equation in the hot rolling automation control system, need typing roll shape curve equation in the steel rolling second control system, the system that makes finishes compound the setting with the control of plate shape and calculates; In level two, before the typing equation, need carry out unit transformation to above-mentioned two roll shape curves and handle.
2. method according to claim 1 is characterized in that, described support roller roll shape curve equation is:
R(x)＝a
0+a
1x+a
2x
2+a
3x
3+a
4x
4+a
5x
5+a
6x
6
In the formula, x is the roll barrel axial coordinate, and the origin of coordinates is a body of roll mid point, unit: mm; R is a roller radius relative deviation amount, unit: um; a
6, a
5, a
4, a
3, a
2, a
1, a
0Be the coefficient from 6 times to constant term in the multinomial, scope is respectively:
a
6＝-3.6129709640*10
-16～-2.6756900092*10
-16；
a
5＝1.9459747028*10
-24～2.6756900092*10
-17；
a
4＝8.4465873947*10
-11～1.1209998557*10
-10；
a
3＝-2.2103822104*10
-11～-5.0453517503*10
-17；
a
2＝-1.1433660012*10
-4～-4.3095500441*10
-5；
a
1＝1.5616796745*10
-10～8.2423485419*10
-6；
a
0＝-8.6146187639*10
-3～2.5537538268*10
-3。
3. method according to claim 1 is characterized in that, described shape of working roll curve is that quadratic equation is: R
2(x)=b
0+ b
1X+b
2x
2, in the formula, x is the roll axial coordinate, the origin of coordinates is positioned at body of roll mid point, the mm of unit; R
2Be roller radius relative deviation amount, the um of unit; Coefficient scope in the multinomial:
b
2＝-1.5802470000*10
-4～-3.9505973672*10
-5；
b
1＝-1.9751881062*10
-3～-6.1062266354*10
-16；
b
0＝-2.4884545848*10
-2～-5.6843418861*10
-13。
4. method according to claim 1, it is characterized in that, described grinding is in the typing of roll shape curve equation and management system of grinding machine, according to mode with polynomial equation, carry out the multinomial coefficient typing of above-mentioned support roller and shape of working roll curve, examine curvilinear equation convexity size and whether coincide with design curve; Carry out grinding program programming, select in the grinding program to the support roller of institute's grinding and working roll given roll shape curve equation, and in grinding program, be cured, support roller and working roll are carried out grinding; Roll forming error after the grinding will satisfy upward machine job requirement.
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