CN101259588A - Fewer stands longitudinal hot rolling minor diameter thin wall seamless steel tube rolling technique and equipment thereof - Google Patents
Fewer stands longitudinal hot rolling minor diameter thin wall seamless steel tube rolling technique and equipment thereof Download PDFInfo
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- CN101259588A CN101259588A CNA200810049650XA CN200810049650A CN101259588A CN 101259588 A CN101259588 A CN 101259588A CN A200810049650X A CNA200810049650X A CN A200810049650XA CN 200810049650 A CN200810049650 A CN 200810049650A CN 101259588 A CN101259588 A CN 101259588A
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Abstract
The invention discloses the rolling technology of a fewer stander longitudinal hot rolling small diameter thin wall seamless steel tube which uses a heating furnace to heat a pierced billet to 950 DEG C to 1150 DEG C, a mandrel trolley pushes a mandrel into the heating pierced billet and is pushed to move forward, and the pierced billet is pushed into a wall reduction rolling unit that is formed by a plurality of wall reduction rolling mills to lead the pierced billet to be carried out longitudinal wall reduction rolling; the pierced billet that breaks away from the mandrel continues to be pushed into a stretch reducing rolling unit that is formed by a plurality of stretch reducing rolling mills to lead the pierced billet to be carried out longitudinal stretch reducing rolling until the rolling is finished; the pierced billet is put into a cold bed to cool; a straightening machine is used for straightening; a finished product is used for delivering and cutting; a flat head machine is used and a detecting machine is used for inspecting; a hydrostatic testing machine is used for detecting; the finished product is bundled and is put in storage. The invention uses the combination of the three-roll longitudinal rolling technology and a retained mandrel to adjust the straight roller longitudinal rolling with umbrella-shaped gears hydraulically and preciously to carries out diameter reduction and wall reduction rolling, and a rolled tube pipeline main control cabinet is used for operating stepless speed regulation of various stands so as to guarantee implementation of the technology, thus rolling the small diameter thin wall seamless steel tube with the diameter of Phi 12mm to Phi 76mm and wall thickness of 1mm to 6mm.
Description
Technical field
The invention belongs to the rolling equipment and the Bar Rolling Process field of steel pipe, what relate generally to is a kind of rolling mill practice and equipment thereof of fewer stands longitudinal hot rolling minor diameter thin-wall seamless steel pipe.Be particularly useful for the production of high accuracy minor diameter thin wall seamless steel tube.
Background technology
Minor diameter thin wall seamless steel tube consumption in every field such as production, life is all very big, and China's 1,600 ten thousand tons of steel pipes of consumption in 2007 have 53% to be minor diameter seamless steel tube.The overall equipment of seamless steel pipe unit of the big-and-middle diameter of China at present is advanced, and production capacity and demand gap are little; Compare with it, the overall equipment of minor diameter seamless steel tube unit is not high, and about 50% production capacity is mean level and falls behind unit.This reflects China's slitless tube mill equipment disparate development, and the overall equipment of minor-diameter steel-tube is still waiting to improve.Currently generally adopt cold-drawn or cold rolling method to obtain minor diameter thin wall seamless steel tube producing actual rolling minor diameter thin wall seamless steel tube, be that cold-drawn or cold rolling method production minor diameter thin wall seamless steel tube all need annealing for several times, pickling, phosphatization, production efficiency is all lower.And production thin-wall seamless steel pipe operation is many, cost is high, the waste resource, exists the problem that effect is slow, energy consumption big, the rate of becoming a useful person is low, seriously polluted, environmental protection pressure is big.The resistance to deformation power of ferrous materials itself in addition, the raw material material scope that makes cold-drawn (rolling) to process is rather narrow etc., the energy and resource had so both been wasted greatly, and can only utilize repeatedly cold-drawn to obtain the higher minor diameter thin wall seamless steel tube of precision for a lot of materials, the expense of taking a lot of work like that especially material, cost is very high, and existing technology is difficult to the high minor diameter thin wall seamless steel tube of machining accuracy, so the processing of minor diameter thin wall seamless steel tube still is a technical barrier so far.Though at present aspect the hot rolling minor diameter thin-wall seamless steel pipe, also there is enterprise to adopt the roller trio skew rolling technology to roll, but, in the oblique milling process, easily thin-wall steel tube is rolled into tail triangle or fried dough twist type owing to be subjected to the restriction and the restriction of plug rigidity of roller trio skew rolling stress (three-dimensional) deformation direction.Therefore the technical elements at the roller trio skew rolling minor diameter thin wall seamless steel tube never has substantial progress.And existing three roller equipment of hot rolling can only rolling Φ 76mm seamless steel pipe.The rolling of the hot rolling minor diameter thin-wall seamless steel pipe that Φ 76mm is following is blank at home always.
Summary of the invention
The objective of the invention is to overcome the deficiency and the defective of existing technical equipment, a kind of rolling mill practice and equipment thereof of fewer stands longitudinal hot rolling minor diameter thin-wall seamless steel pipe are provided, make its can rolling Φ 76mm following minor diameter thin wall seamless steel tube, and effectively enhance productivity and the precision and the mechanical property of steel pipe.
The present invention realizes that the method that the rolling technology is taked is: with heating furnace hollow forging is heated to 950--1150 ℃, mandrel trolley penetrates plug in the hollow forging of heating and promotes to move ahead, and hollow forging is pushed that hollow forging is vertically subtracted wall is rolling by many rolling units of wall that subtract that subtract that the wall milling train forms; The hollow forging that breaks away from plug is continued to push the stretch reducing unit of being made up of many stretch reducing milling trains to carry out the longitudinal tension force reducing and rolling to hollow forging and finishes until rolling; Enter the cold bed cooling then; The straightener aligning; The finished product roller-way is carried cutting, chamfering machine tack, defectoscope flaw detection, water pressure test machine testing, bundling, warehouse-in.
The equipment that the present invention realizes the rolling process using mainly by mandrel trolley, plug, subtract wall milling train, stretch reducing milling train, heating furnace, cold bed, straightener, cutting machine, online detection instrument and main control cabinet and constitute, mandrel trolley moves back and forth along guide rail, an end of plug and mandrel trolley is fixed and with the same moved further of mandrel trolley; Subtract and have three rolls that are mutually 120 ° of distributions on the wall milling train and provide power by motor, have Y type circular groove on the excircle of each roll, both sides are provided with the umbrella shape tooth, the Circularhole diameter that the Y type circular groove of these three rolls forms is identical with the external diameter of the rolled steel tube of wanting, and by first to last linear successively successively decreasing; Have three rolls that are mutually 120 ° of distributions on the stretch reducing milling train and provide power by motor, have Y type circular groove on the excircle of each roll, both sides are equipped with the umbrella shape tooth, the Circularhole diameter that the Y type circular groove of these three rolls forms is identical with the external diameter of the rolled steel tube of wanting, and by first to last linear successively successively decreasing.
The present invention utilizes three roller axial rolling technology to combine with retained mandrel, it is rolling that the hydraulic pressure accurate straight roller axial rolling of adjusting band umbrella shape tooth carrying out tube reducing subtracts wall, by tube rolling streamline main control cabinet each frame is carried out stepless speed regulation, to guarantee implementation of processes, thereby roll out external diameter φ 12mm～φ 76mm, wall thickness is at the minor diameter thin wall seamless steel tube of 1～6mm.Owing to adopt Y type circular groove roll, and the every bit of Y type circular groove is all tangent with the outer wall of steel pipe, numerous points of tangency connect together promptly be one just round, make that the stress just be subjected to is even in 360 degree scopes of rolling steel pipe, can not make the distortion of light-wall pipe draw down.Because when rolling process, the rotation of roll drives the steel pipe move toward one another, promptly roll promotes steel pipe and vertically advances in opposite directions along vertical rotation of steel pipe, therefore can realize vertically rolling.Y type circular groove roll rotational speed is fast, the effect height.Because plug has interior refrigerating function, thereby solved in the process of instant cooling plug and just do not cooled off problem at rolled steel tube.And plug is a conical in shape, in subtracting the wall operation of rolling, plays the internal mold effect at steel pipe, cooperates with roll steel pipe is worked to subtract wall.
Description of drawings
Fig. 1 is the front view of tube rolling unit of the present invention.
Fig. 2 is the A-A profile of Fig. 1.
Fig. 3 is the vertical view of whole piece production line of the present invention.
Fig. 4 is the structural representation of plug of the present invention.
Fig. 5 is the vertical view of roll of the present invention.
Fig. 6 is the left view of roll of the present invention.
Among the figure: 1, mandrel trolley; 2, plug; 3a～3d, subtract the rolling unit of wall; 4a～4d, the rolling unit of stretch reducing; 5a～5g, threephase asynchronous machine; 6a～6g, DC frequency-changing device; 7, tube rolling streamline main control cabinet; The straight roller of axial rolling of 8a～8c, band umbrella shape tooth; 9, annulus formula heating furnace; 10, discharging roller-way; 11, rollgang; 12a, cold bed; 12b, cold bed; 13, straightener; 14, cutting machine; 15, online detection instrument; 16, baler; 17, tapered core caput, 18, cavity pull bar; 19, cooling cavity; 20, water inlet; 21, delivery port; 22, plug bearing cap; 23, the straight roller of axial rolling; 24, umbrella shape tooth; 25, Y type circular groove.
The specific embodiment
The present invention is further described in conjunction with the accompanying drawings.
Rolling mill practice of the invention process is as follows: with heating furnace hollow forging is heated to 950--1150 ℃, hollow forging after will heating with manipulator is delivered to charging roller, mandrel trolley penetrates plug in the hollow forging of heating and promotes to move ahead, and hollow forging pushed that hollow forging is vertically subtracted wall is rolling by many wall milling train groups that subtract that subtract that the wall roll mill forms, mandrel trolley is delivered to the plug end and is subtracted the rolling unit of wall and stop after last with hollow forging, mandrel trolley pulling plug breaks away from steel pipe and the milling train that has been rolled, fall back on original position, begin rolling another root hollow forging, the circulation that so goes round and begins again is rolling.The hollow forging that breaks away from plug is continued to push the stretch reducing milling train of being made up of many stretch reducing milling trains hollow forging is carried out the longitudinal tension force reducing and rolling finish, enter cold bed then and cool off until rolling; The straightener aligning; The finished product roller-way is carried cutting, chamfering machine tack, defectoscope flaw detection, water pressure test machine testing, bundling, warehouse-in.
In order to enhance productivity, save the energy, improve the precision of steel pipe, plug can be designed to interior cooling structure, it is only cooled off plug in the operation of rolling.
As Fig. 1 in conjunction with shown in Figure 3: the equipment that present embodiment is realized above-mentioned process using mainly by mandrel trolley 1, plug 2, subtract the rolling unit 3a～3d of wall, the rolling unit 4a～4g of stretch reducing, seam formula rotary heating furnace 9, cold bed 12a 12b, straightener 13, cutting machine 14, online detection instrument 15 and main control cabinet 7 and form, seam formula rotary heating furnace 9 has made full use of heat energy hollow forging has been heated, and make hollow forging heating more even, provide good rolling condition for rolling.Mandrel trolley 1 is the motion carrier of plug 2, and power is provided by air pump, moves back and forth on guide rail.The tail end of plug 2 is fixed on the mandrel trolley 1 by the triangular form chuck, and can carry out front and back adjustment to the position of plug by the PLC control system, needs to guarantee rolling mill practice.
As shown in Figure 4: plug 2 is made up of tapered core caput 17, cavity pull bar 18, cooling cavity 19 and water inlet 20 and delivery port 21.The front portion of plug 2 is that tapered core caput, middle part are that cavity pull bar, rear portion are bearing cap, and inner is that circulation hollow is cooled off cavity, and the bearing cap that its rear portion is connected with mandrel trolley is provided with water inlet and delivery port.During use, the tail end of plug 2 is fixed on the mandrel trolley 1, plug penetrates in the hollow forging earlier, penetrate in the process of hollow forging at plug, when plug penetrated hollow forging arrival appointment rolling position, the draw-in groove on the mandrel trolley can block plug and move on, and plug advances jointly along with mandrel trolley promotes hollow forging then, the plug end promptly rests on rolling and serves as internal mold, cooperates with roll to carry out tube rolling.When rolling, cooling water is discharged by delivery port 21 by water-cooled cavity 19 backs that water inlet 20 enters plug, by ceaselessly cooling off plug, to guarantee that plug at high temperature has enough hardness and rigidity, so that operate as normal.After a steel pipe rolling was finished, plug was driven by mandrel trolley and extracts out, treats that next round is rolling.
Subtract the rolling unit 3a～3d of wall and be made up of one to four frame, present embodiment subtracts the wall milling train by four to be formed, and every rolling mill structure is identical, the kind of drive is identical, just the formed pass of roll varies in size, and by linear successively backward the successively decreasing of inlet, to subtract the wall process be a continuous process thereby make.(as Fig. 2, Fig. 5, shown in Figure 6) every subtracts and all has three roll 8a～8c that are mutually 120 ° of distributions on the wall milling train, and each roll structure is identical, has Y type circular groove 25 on its excircle, and both sides are equipped with umbrella shape tooth 24.The internal diameter of the circular hole that the Y type circular groove of these three rolls forms promptly is the external diameter of the rolled steel tube of wanting.When rolling, steel pipe and three Y type circular grooves are tangent, and the rotation of roll drives the steel pipe move toward one another, and promptly roll promotes steel pipe and vertically advances in opposite directions along vertical rotation of steel pipe, therefore can realize vertically rolling.Subtract the wall milling train in the operation of rolling, add plug at the steel pipe internal mold, plug cooperates with roll, and it is rolling to work to subtract wall.
The rolling unit 4a～4g of stretch reducing is made up of one to four frame, present embodiment subtracts the wall milling train by four and forms, every rolling mill structure is identical, the kind of drive is identical, just the formed pass of roll varies in size, by linear successively successively decreasing behind the forward direction, be a continuous process thereby make the tube reducing process.All have three roll 8a～8c that are mutually 120 ° of distributions on every stretch reducing milling train, each roll structure is identical, has Y type circular groove 25 on its excircle, and both sides are equipped with umbrella shape tooth 24 (as Fig. 2, Fig. 5, shown in Figure 6).The internal diameter of the circular hole that the Y type circular groove of these three rolls forms promptly is the external diameter of the rolled steel tube of wanting.When rolling, steel pipe and three Y type circular grooves are tangent, and the rotation of roll drives the steel pipe move toward one another, and promptly roll promotes steel pipe and vertically advances in opposite directions along vertical rotation of steel pipe, therefore can realize vertically rolling.In the operation of rolling, need not add plug at the steel pipe internal mold, utilize the direct reducing and rolling of principle of stretch reducing.
During use, by annulus formula heating furnace 9 hollow forging is heated to about 1100 ℃, 10 backs are pushed to rollgang 11 by manipulator after entering charging roller, plug young pathbreaker retained mandrel 2 inserts in the hollow forgings and hollow forging is pushed and subtracts the rolling unit 3a～3d of wall and begin to be rolled, subtracting the wall milling train by four cooperates with plug waste tube wall is rolled to the technological requirement size, and suitably reduce waste external diameter of pipe, mandrel trolley advances plug always with the rolling of hollow forging, march to the 4th always and subtract the wall milling train, hollow forging subtracts after the wall milling train comes out from the 4th, because the plug position is limited, so when subtracting the wall milling train from the 4th and coming out, also carried out taking off rod, enter first stretch reducing milling train 4a immediately and carry out reducing and rolling, move to the 4th stretch reducing milling train of 4d always, rolling finishing enters cold bed 12a and carries out laminar flow cooling, carry out alignment from entering straightener 13 after cold bed 12b cools off out, carry out scale or multiple length cutting with 14 pairs of steel pipes of cutting machine afterwards, detect by 15 pairs of pipe quality of online detection instrument again, enter baler 16 bundlings after qualified to get final product.
Claims (5)
1, a kind of rolling mill practice of fewer stands longitudinal hot rolling minor diameter thin-wall seamless steel pipe, it is characterized in that: hollow forging is heated to 950--1150 ℃ with heating furnace, mandrel trolley penetrates plug in the hollow forging of heating and promotes to move ahead, and hollow forging is pushed that hollow forging is vertically subtracted wall is rolling by many rolling units of wall that subtract that subtract that the wall milling train forms; The hollow forging that breaks away from plug is continued to push the rolling unit of the stretch reducing of being made up of many stretch reducing milling trains to carry out the longitudinal tension force reducing and rolling to hollow forging and finishes until rolling; Enter the cold bed cooling then; The straightener alignment; The finished product roller-way is carried cutting, chamfering machine tack, defectoscope flaw detection, water pressure test machine testing, bundling, warehouse-in.
2, a kind of equipment of realizing the described fewer stands longitudinal hot rolling minor diameter of claim 1 thin-wall seamless steel pipe rolling mill practice, mainly comprise mandrel trolley (1), plug (2), subtract wall milling train (3a～3d), the stretch reducing milling train (4a～4g), heating furnace (9), cold bed (12a) (12b), straightener (13), cutting machine (14), online detection instrument (15) and main control cabinet (7), mandrel trolley moves back and forth along guide rail, one end of plug and mandrel trolley is fixed and with the same moved further of mandrel trolley, it is characterized in that: subtract and have three rolls that are mutually 120 ° of distributions on the wall milling train and provide power by motor, have Y type circular groove on the excircle of each roll, both sides are provided with umbrella shape tooth (24), the Circularhole diameter that the Y type circular groove of these three rolls forms is identical with the external diameter of the rolled steel tube of wanting, and by first to last linear successively successively decreasing; Have three rolls that are mutually 120 ° of distributions on the stretch reducing milling train and provide power by motor, have Y type circular groove on the excircle of each roll, both sides are equipped with umbrella shape tooth (24), the Circularhole diameter that the Y type circular groove of these three rolls forms is identical with the external diameter of the rolled steel tube of wanting, and by first to last linear successively successively decreasing.
3, fewer stands longitudinal hot rolling minor diameter thin-wall seamless steel pipe equipment according to claim 2, it is characterized in that: described plug (2) is made up of tapered core caput (17), cavity pull bar (18), cooling cavity (19) and water inlet (20) and delivery port (21), the front portion of plug is that tapered core caput, middle part are that cavity pull bar, rear portion are bearing cap, inner is that circulation hollow is cooled off cavity, and water inlet and delivery port are positioned on the bearing cap at rear portion.
4, fewer stands longitudinal hot rolling minor diameter thin-wall seamless steel pipe equipment according to claim 2 is characterized in that: describedly subtract the wall milling train ((4a～4g) is one to four for 3a～3d) or stretch reducing milling train.
5, fewer stands longitudinal hot rolling minor diameter thin-wall seamless steel pipe equipment according to claim 2, it is characterized in that: described heating furnace (9) is a seam formula rotary heating furnace.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810049650XA CN101259588A (en) | 2008-04-28 | 2008-04-28 | Fewer stands longitudinal hot rolling minor diameter thin wall seamless steel tube rolling technique and equipment thereof |
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| CNA200810049650XA CN101259588A (en) | 2008-04-28 | 2008-04-28 | Fewer stands longitudinal hot rolling minor diameter thin wall seamless steel tube rolling technique and equipment thereof |
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| CN101850516A (en) * | 2010-05-24 | 2010-10-06 | 建湖恒华机电有限公司 | Synchronous straightening and cutting machine of multipath linear pipe |
| CN102233355A (en) * | 2010-04-28 | 2011-11-09 | 洛阳璋泰非标机械有限公司 | Technological process for adding retained mandrel to reducing rolling section of hot-rolled small-diameter seamless steel tube |
| CN102947017A (en) * | 2010-06-09 | 2013-02-27 | 丹尼尔和科菲森梅克尼齐有限公司 | High-speed wire rod rolling apparatus and method |
| CN103272845A (en) * | 2013-05-02 | 2013-09-04 | 长葛市一鸣机械有限公司 | Hot rolling process of small-bore ultra-thin-wall seamless steel tube |
| CN104772333A (en) * | 2014-01-15 | 2015-07-15 | 宝山钢铁股份有限公司 | Rolling method for hot rolling seamless continuous-rolled thin-walled pipe |
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| CN109604369A (en) * | 2018-09-14 | 2019-04-12 | 山东庆云三友机械电器有限公司 | Precision seamless steel tubes production technology |
| CN110508625A (en) * | 2019-10-17 | 2019-11-29 | 东北大学 | On-line Control cooling device and method for middle small-caliber hot rolling seamless steel |
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| CN101850516A (en) * | 2010-05-24 | 2010-10-06 | 建湖恒华机电有限公司 | Synchronous straightening and cutting machine of multipath linear pipe |
| CN102947017A (en) * | 2010-06-09 | 2013-02-27 | 丹尼尔和科菲森梅克尼齐有限公司 | High-speed wire rod rolling apparatus and method |
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| CN104772333A (en) * | 2014-01-15 | 2015-07-15 | 宝山钢铁股份有限公司 | Rolling method for hot rolling seamless continuous-rolled thin-walled pipe |
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| CN105750846A (en) * | 2016-05-12 | 2016-07-13 | 中国兵器工业第五九研究所 | Quick forming method of low-alloy high-strength steel deep hole component |
| CN106736591B (en) * | 2017-01-24 | 2019-07-26 | 响水县融升科技有限公司 | A kind of automated production equipment for breathing out fragrant anchor fixing groove |
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| CN109425655A (en) * | 2017-08-24 | 2019-03-05 | 重庆钢铁(集团)有限责任公司 | A kind of smart squaring method of the gradual charging of metal tube |
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| CN108339855B (en) * | 2018-01-11 | 2024-04-05 | 宣化钢铁集团有限责任公司 | Automatic steel picking device of cooling bed and steel picking method thereof |
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| CN109590333A (en) * | 2018-11-26 | 2019-04-09 | 湖北新冶钢特种钢管有限公司 | A kind of push pipe method preparing thin-wall steel tube using small base type |
| CN110508625A (en) * | 2019-10-17 | 2019-11-29 | 东北大学 | On-line Control cooling device and method for middle small-caliber hot rolling seamless steel |
| CN113664554A (en) * | 2021-10-22 | 2021-11-19 | 源创(广州)智能科技有限公司 | Full-automatic production line for automobile seat pipe fittings |
| CN116890033A (en) * | 2023-09-11 | 2023-10-17 | 江苏常宝钢管股份有限公司 | Preparation method of pipe |
| CN116890033B (en) * | 2023-09-11 | 2023-12-19 | 江苏常宝钢管股份有限公司 | Preparation method of pipe |
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