CN103537482A - Rolling technology for deformed steel bars - Google Patents
Rolling technology for deformed steel bars Download PDFInfo
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- CN103537482A CN103537482A CN201310555703.6A CN201310555703A CN103537482A CN 103537482 A CN103537482 A CN 103537482A CN 201310555703 A CN201310555703 A CN 201310555703A CN 103537482 A CN103537482 A CN 103537482A
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Abstract
The invention discloses a rolling technology for deformed steel bars. The output effect is increased by reducing roller reserves, the roller number and the guide number, shortening the specification changing auxiliary time and increasing the rolling mill operation time.
Description
Technical field
The present invention relates to screw-thread steel rolling technical field, particularly relate to a kind of rolling mill practice of screw-thread steel.
Background technology
Rolling unit institute each kind of production specification has a set of rolling mill technology pass of independent special use to arrange, the Varieties such as shared milling equipment quantity is huge, roll quantity, hole model kind are very many, guide and guards are various, take longer nonproductive time used while changing production specification, human resources workload is heavy, consumption indicators high, greatly restrict the activity duration, thereby caused output there is no the space promoting.
Prior art processes layout is comprised of 18 tandem mills, and 1H-2V-3H-4V-5H-6V-7H-8V-9H-10V-11H-12V is the pass code name of roughing unit and intermediate mill; Wherein thick tandem rolling mill group is comprised of 1H-6V milling train that high rigidity horizontally and vertically alternative arranges of remaining silent, 7H-12V is intermediate mill, and 13H-18V is that (H represents horizontal milling train to mm finishing mill unit, and V represents vertical mill, numeral passage), milling train quantity and technique are arranged and are seen the following form:
Following table is the front mm finishing mill unit pass technological process of transformation
Mm finishing mill unit shelf number; 13H 14V 15H 16V 17H 18V
Variant type product finish-rolling process flow process pass code name
φ18，2802，2801Y，2202，2201Y，1802，1801R
φ20，2502，2501Y，2002，2001R
φ22，2802，2801Y，2202，2201R
φ25，2502，2501R
Φ28，2802，2801R
φ32，3202，3201R
Note; Hole model is specifically containing adopted ﹙ Y; The basic circle size of digitized representation circle before expression round pass, Y, 02 in numeral; Expression oval groove, its numeral are named according to round pass, and expression is the second rolling mill of round pass, R; Represent last groove, also represent last passage)
Concrete technology is in Table 1 each specification groove rolling passage and technical parameter
Table 1
Table 2 rolling unit roll technology parameter
From improving, rolling mill practice flow process can find out that the product of 6 kinds of specifications shares 15 kinds of pass techniques, and concrete rolling mill practice operation is as follows:
18 of the total rolling passes of φ 18 specification, rolling unit needs the milling train of 6 kinds of hole models, and the storage level of all specification concave rolls must guarantee that one could meet Production requirement for three according to requirements, takies altogether 36 of finishing roll quantity;
16 of the total rolling passes of φ 20 φ 22 specification are respectively comprised of 4 roll mill passes, and two kinds of models take 48 of finishing roll quantity altogether;
14 of the total rolling passes of φ 25 φ 28 specification are respectively comprised of 2 roll mill passes, take altogether 24 of finishing roll quantity;
12 of the total rolling passes of φ 32 specification are respectively formed and are taken altogether 12 of finishing roll quantity by 2 roll mill passes;
Each specification takies 120, roll altogether, and every roll price, 10,000 yuan of left and right, amounts to more than 120 ten thousand yuan of occupied funds.
All specification has configured and need take 15 rolling mills, altogether needs standby 15 rolling mills to recycle, altogether need to take more than 30 rolling mills,
From φ 18 specifications replacing φ 20, need tear 6 open and fill 4,
φ 20 specifications replacing φ 22 need tear 4 open and fill 4,
φ 22 specifications replacing φ 25 need tear 4 open and fill 2,
φ 25 specifications replacing φ 28 need tear 4 open and fill 4,
φ 28 specifications are changed φ 32 and are rolled 2, two of finish rolling in need tearing open and fill 2,
Each specifications and models of changing are because pass technique is numerous, need the milling train of replacing corresponding with guide and guard more, each concerned process steps staff labor intensity of workshop is very large, so taking nonproductive time extends, average every kind of specification needs more than 2 hours, restrict greatly pure rolling the working time, badly influenced year production output.
Summary of the invention
Object of the present invention is exactly that a kind of rolling mill practice of screw-thread steel is provided for the defect of above-mentioned existence.This technique is changed specification non-cutting time by reducing roll deposit, milling train quantity, guide and guard quantity, shortening, thereby improving the milling train activity duration reaches and increase output effect.
The Bar Rolling Process scheme of a kind of screw-thread steel of the present invention is, this technique be divided into roughing, in roll and finish rolling, totally 10 of roughing unit and intermediate mills, be specially 1H-2V-3H-4V-5H-6V-9H-10V-11H-12V, and wherein 1H-6V is that roughing unit, 9H-10V-11H-12V are intermediate mill; Mm finishing mill unit is 13H-14V-15H-16V-17H-18V.
The 11H pass of the 13H of mm finishing mill unit and intermediate mill shares, and the 12V pass of the 14V of mm finishing mill unit and intermediate mill shares.
The pass of 11H and 13H is that the pass of 3202,12V and 14V is 3201Y.
Except as last passage, the pass that the pass of 15H is 2602,16V is 2601Y.
Except as last passage, the pass of 17H is 2102.
Specific as follows:
Mm finishing mill unit shelf number: 13H 14V 15H 16V 17H 18V
Applicable hole model: φ 18,11H, 12V, 2602,2601Y, 2102,1801R
φ20，11H，12V，2602，2601Y，2102，2001R
φ22，11H，12V?，2602，2601Y，2102，2201R
φ25，11H，12V?，2602，2501R
Φ28，11H，12V，?2602，2801R
φ32，11H，3201R。
The maximum linear velocity of each passage milling train is: 1H 0.368m/s, 2V 0.604 m/s, 3H 0.652m/s, 4V 0.787m/s, 5H 1.513m/s, 6V 1.611 m/s, 9H 2.970m/s, 10V 3.663 m/s, 11H 4.917m/s, 12V 7.612m/s, 13H 6.035m/s, 14V 7.930 m/s, 15H 9.446m/s, 16V 17.085m/s, 17H 18.589m/s, 18V 23.236m/s.
Finish rolling is divided into preheating section, bringing-up section, soaking zone and comes out of the stove, wherein, 800 ℃ of preheating section temperature <, bringing-up section temperature is 1080-1170 ℃, and soaking zone temperature is 1100-1220 ℃, and tapping temperature is 960-1220 ℃.
This technique is applicable to the screw-thread steel that rolling specs is φ 18, φ 20, φ 22, φ 25, φ 28, φ 32.
Beneficial effect of the present invention is: technical solution of the present invention has following 2 improvement
1, optimize rolling unit all size model pass technique, the product that all size model is adjacent accomplishes that design of section of rolling mill shares as far as possible and accomplishes only to change material molded dimension and the linear velocity that finisher is only adjusted each sortie rolled piece,
2, all size model all shares a set of roughing unit and intermediate mill roll pass technique, and different product specifications is only adjusted material molded dimension and the linear velocity of each sortie rolled piece.
Roll mill has become 11 kinds of techniques from 15 kinds of passes, take more than 88 of roll quantity, reduce 32 of spare rolls, only these cost-saving 320,000 yuan, take 11 rolling mills, only the milling train of standby 8 left and right of need just recycles and can meet Production requirement, change now specifications and models because pass technique reduces, need the also corresponding minimizing of milling train quantity of changing, so take nonproductive time, reduce, average every kind of specification only need 35 minutes just enough, increased pure rolling the working time, by 120 tons of calculating of production capacity per hour, monthly output at least improves more than 1800 tons.By the technological transformation of rolling unit technique, do not investing under the prerequisite of new equipment, realized sharing of the required milling train of various product specifications, the potential of existing equipment has been excavated in maximization, has reduced production cost, has saved non-cutting time, has also increased output simultaneously, and the roll changing time of finish rolling of the present invention reduces one times, roll storage level, handling time etc. reduce by 50%, production time extends, and output increases by 30%, and consumption costs declines 10%.Make enterprise produce indices and again jump onto a new step.
the specific embodiment:
In order to understand better the present invention, with instantiation, describe technical scheme of the present invention in detail below, but the present invention is not limited thereto.
The rolling mill practice of a kind of screw-thread steel of the present invention, be divided into roughing, in roll and finish rolling, totally 10 of roughing unit and intermediate mills, be specially 1H-2V-3H-4V-5H-6V-9H-10V-11H-12V, and wherein 1H-6V is that roughing unit, 9H-10V-11H-12V are intermediate mill; Mm finishing mill unit is 13H-14V-15H-16V-17H-18V.
The 11H pass of the 13H of mm finishing mill unit and intermediate mill shares, and the 12V pass of the 14V of mm finishing mill unit and intermediate mill shares.
The pass of 11H and 13H is that the pass of 3202,12V and 14V is 3201Y.
Except as last passage, the pass that the pass of 15H is 2602,16V is 2601Y.
Except as last passage, the pass of 17H is 2102.
Specific as follows:
Mm finishing mill unit shelf number: 13H 14V 15H 16V 17H 18V
Applicable hole model: φ 18,11H, 12V, 2602,2601Y, 2102,1801R
φ20，11H，12V，2602，2601Y，2102，2001R
φ22，11H，12V?，2602，2601Y，2102，2201R
φ25，11H，12V?，2602，2501R
Φ28，11H，12V，?2602，2801R
φ32，11H，3201R。
The linear velocity of each passage milling train is: 1H 0.337-0.368m/s, 2V 0.554-0.604 m/s, 3H 0.598-0.652m/s, 4V 0.721-0.787m/s, 5H 1.387-1.513m/s, 6V 1.477-1.611 m/s, 9H 2.723-2.970m/s, 10V 3.358-3.663 m/s, 11H 4.507-4.917m/s, 12V 6.978-7.612m/s, 13H 5.532-6.035m/s, 14V 7.269-7.930 m/s, 15H 8.658-9.446m/s, 16V 15.661-17.085m/s, 17H 17.040-18.589m/s, 18V 21.230-23.236m/s.
Finish rolling is divided into preheating section, bringing-up section, soaking zone and comes out of the stove, wherein, 800 ℃ of preheating section temperature <, bringing-up section temperature is 1080-1170 ℃, and soaking zone temperature is 1100-1220 ℃, and tapping temperature is 960-1220 ℃.
The finishing stands heating-up temperature that is applicable to different product is as follows
Table 3 major product heating-up temperature
This technique is applicable to the screw-thread steel that rolling specs is φ 18, φ 20, φ 22, φ 25, φ 28, φ 32.Alleged Ribbed Bar is screw-thread steel below.
Embodiment 1
Φ 18 φ, φ 20, φ 22 mm total technological process are 18 and go out finished product in 18V frame,
Three kinds of product specifications all share 11H, 12V, 2602,2601Y, 2102 model milling trains such as hole such as 5 of grades, while changing specification, only change the 1801R of corresponding specification, 2001R, 2201R finished hole forming roll, requires to adjust each passage workpiece measurement and linear velocity according to corresponding material type, and detail parameters is asked for an interview table 4-6.
Table 4 is produced Φ 18 Ribbed Bar technological parameters
Table 5 is produced φ 20 Ribbed Bar technological parameters
Table 6 is produced φ 22 Ribbed Bar technological parameters
Embodiment 2
φ 25 φ 28 mm total technological process are 16 sorties, in 16V frame, go out finished product
Two all product specifications all share 11H, 12V, 2602,3 hole model milling trains, while changing specification, dismantle Φ 18, φ 20, φ 22 2601Y used, 2102 and finisher, replacing φ 25, the corresponding 2501R of φ 28,2801R finished hole forming roll, adjust each passage workpiece measurement and linear velocity, detail parameters is as table 7-8.
Table 7 is produced φ 25 Ribbed Bar technological parameters
Table 8 is produced φ 28 Ribbed Bar technological parameters
Embodiment 3
φ 32 mm total technological process are that 12 sorties go out finished product in 14V frame
By φ 25 φ 28 mm, change φ 32 mm specifications, the φ 25 that dismantles, φ 28 specifications 12V used, 2602 and 2501R, 2801R last groove milling train, shares 11H hole type roll, only changes corresponding finished product roller 3201R,, adjust each passage workpiece measurement and linear velocity, detail parameters is as table 9.
Table 9 is produced φ 32 Ribbed Bar technological parameters
Technique effect
16 of the total rolling passes of φ 18 φ 20 φ 22 specification, mm finishing mill unit needs the milling train of 6 kinds of hole models, by one, for three calculating, takies altogether finishing roll quantity
48, than Xian You Ji Shu ﹙ 84 Zhi ﹚, reduce 36
14 of the total rolling passes of φ 25 φ 28 specification are respectively comprised of 4 finishing mill passes, by one, for three calculating, take altogether finishing roll quantity
12, than Xian You Ji Shu ﹙ 24 Zhi ﹚, reduce 12
12 of the total rolling passes of φ 32 specification are respectively comprised of 2 finishing mill passes, by one, for three calculating, take altogether finishing roll quantity
6, than Xian You Ji Shu ﹙ 12 Zhi ﹚, reduce 6
Each specification takies 66, roll altogether, reduces 45 compared to existing technology with 120 ﹚ of roller amount ﹙, and every roll price is 10,000 yuan of left and right, and each cycle reduces by 450,000 yuan of expenses of consuming and within three months, scraps ﹚ by ﹙ roll life cycle
φ 18 specifications replacing φ 20 prior aries need be torn 6 open and be filled 4, and the present invention only changes 1 last groove frame
φ 20 specifications replacing φ 22 prior aries need be torn 4 open and be filled 4, and the present invention only changes 1 last groove frame
φ 22 specifications replacing φ 25 prior aries need be torn 4 open and be filled 2, and the present invention only changes 1 last groove frame,
φ 25 specifications replacing φ 28 prior aries need be torn 4 open and be filled 4, and the present invention only changes 1 last groove frame,
φ 28 specifications are changed φ 32 prior aries and are rolled 2, two of finish rolling in need tearing open and fill 2, and the present invention tears 3 open and fills 1 last groove frame,
All specification has configured needs to use 11 rolling mills, only needs standby 7 pass milling trains just enough to recycle, and altogether takies 18 rolling mills, with prior art contrast, reduces 12 more than,
From above process data, can find out the present invention compared to existing technology, excellent beneficial effect is very obvious, the finish-rolling process pass sharing nature of product has been accomplished maximization, the product of 6 kinds of specifications has become 11 kinds of techniques from 15 kinds of pass techniques, because pass technique reduces, roll storage level reduces 30%, save consumption costs year more than 2,000,000 yuan, milling train and guide and guards quantity also relative minimizing more than 20%, take and reduce nonproductive time, change specification average only need 35 minutes just enough, compare and reduce unproductive time 15%, increased pure rolling the working time, reached the optimum efficiency of finish-rolling process technological transformation.By optimizing mm finishing mill unit technology means, there is no investment or changing under the prerequisite of miscellaneous equipment, realized sharing of the required milling train of various product specifications, maximization excavated existing equipment potential, promoted production capacity, reduced production cost, saved non-cutting time, also increased output, utilized most effectively technological means simultaneously, the theory ，Shi enterprise that has fully demonstrated science and technology and be exactly productivity produces indices and again jumps and attain a new height.
Claims (8)
1. the rolling mill practice of a screw-thread steel, it is characterized in that, be divided into roughing, in roll and finish rolling, totally 10 of roughing unit and intermediate mills, be specially 1H-2V-3H-4V-5H-6V-9H-10V-11H-12V, wherein 1H-6V is that roughing unit, 9H-10V-11H-12V are intermediate mill; Mm finishing mill unit is 13H-14V-15H-16V-17H-18V.
2. the rolling mill practice of a kind of screw-thread steel according to claim 1, is characterized in that, the 11H pass of the 13H of mm finishing mill unit and intermediate mill shares, and the 12V pass of the 14V of mm finishing mill unit and intermediate mill shares.
3. the rolling mill practice of a kind of screw-thread steel according to claim 1, is characterized in that, the pass of 11H and 13H is that the pass of 3202,12V and 14V is 3201Y.
4. the rolling mill practice of a kind of screw-thread steel according to claim 1, is characterized in that, except as last passage, the pass that the pass of 15H is 2602,16V is 2601Y.
5. the rolling mill practice of a kind of screw-thread steel according to claim 1, is characterized in that, except as last passage, the pass of 17H is 2102.
6. the rolling mill practice of a kind of screw-thread steel according to claim 1, is characterized in that, each passage milling train maximum linear velocity is: 1H 0.368m/s, 2V 0.604 m/s, 3H 0.652m/s, 4V 0.787m/s, 5H 1.513m/s, 6V 1.611 m/s, 9H 2.970m/s, 10V 3.663 m/s, 11H 4.917m/s, 12V 7.612m/s, 13H 6.035m/s, 14V 7.930 m/s, 15H 9.446m/s, 16V 17.085m/s, 17H 18.589m/s, 18V 23.236m/s.
7. the rolling mill practice of a kind of screw-thread steel according to claim 1, it is characterized in that, finish rolling is divided into preheating section, bringing-up section, soaking zone and comes out of the stove, wherein, 800 ℃ of preheating section temperature <, bringing-up section temperature is 1080-1170 ℃, and soaking zone temperature is 1100-1220 ℃, and tapping temperature is 960-1220 ℃.
8. the rolling mill practice of a kind of screw-thread steel according to claim 1, is characterized in that, this technique is applicable to the screw-thread steel that rolling specs is φ 18, φ 20, φ 22, φ 25, φ 28, φ 32.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470355A (en) * | 2017-08-11 | 2017-12-15 | 张家港联峰钢铁研究所有限公司 | A kind of optimize technique for the root high speed wire rolling that rubs |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002321001A (en) * | 2001-04-27 | 2002-11-05 | Nkk Corp | Rolling method and device for reinforced rod steel |
| CN101920271A (en) * | 2010-07-27 | 2010-12-22 | 福建三宝特钢有限公司 | Controlled rolling and controlled cooling production process of HRB400 (Hot-rolled Ribbed-steel Bar 400) steel bar |
| CN102000694A (en) * | 2010-09-29 | 2011-04-06 | 莱芜钢铁股份有限公司 | Processing method and system for deformed steel bar |
| CN102225431A (en) * | 2011-04-10 | 2011-10-26 | 合肥东方节能科技股份有限公司 | Steel rolling system provided with no-twist interchange type rolling piece guiding device |
| CN102814320A (en) * | 2011-06-10 | 2012-12-12 | 新疆八一钢铁股份有限公司 | Four-line splitting rolling technology for fai 12mm round steel |
-
2013
- 2013-11-11 CN CN201310555703.6A patent/CN103537482B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002321001A (en) * | 2001-04-27 | 2002-11-05 | Nkk Corp | Rolling method and device for reinforced rod steel |
| CN101920271A (en) * | 2010-07-27 | 2010-12-22 | 福建三宝特钢有限公司 | Controlled rolling and controlled cooling production process of HRB400 (Hot-rolled Ribbed-steel Bar 400) steel bar |
| CN102000694A (en) * | 2010-09-29 | 2011-04-06 | 莱芜钢铁股份有限公司 | Processing method and system for deformed steel bar |
| CN102225431A (en) * | 2011-04-10 | 2011-10-26 | 合肥东方节能科技股份有限公司 | Steel rolling system provided with no-twist interchange type rolling piece guiding device |
| CN102814320A (en) * | 2011-06-10 | 2012-12-12 | 新疆八一钢铁股份有限公司 | Four-line splitting rolling technology for fai 12mm round steel |
Non-Patent Citations (1)
| Title |
|---|
| 孔利明等: "圆钢多线切分轧制工艺开发", 《新疆钢铁》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470355A (en) * | 2017-08-11 | 2017-12-15 | 张家港联峰钢铁研究所有限公司 | A kind of optimize technique for the root high speed wire rolling that rubs |
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Address after: 256209 Shandong city of Binzhou province Zouping County Han Zhen private science and Technology Park Patentee after: Xiwang Special Steel Company Limited Address before: 256209 Shandong city of Binzhou province Zouping County Han Zhen private science and Technology Park Patentee before: Shandong Xiwang Special Steel Co., Ltd. |
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