CN103736740A - Roller way speed control method for rolling of screw-thread steel - Google Patents
Roller way speed control method for rolling of screw-thread steel Download PDFInfo
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- CN103736740A CN103736740A CN201310747405.7A CN201310747405A CN103736740A CN 103736740 A CN103736740 A CN 103736740A CN 201310747405 A CN201310747405 A CN 201310747405A CN 103736740 A CN103736740 A CN 103736740A
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Abstract
The invention discloses a roller way speed control method for rolling of screw-thread steel, which is realized based on a rolling machine set and a flying shear for production of the screw-thread steel. The rolling machine set comprises an input roller way first section, an input roller way second section and an accelerating roller way. The roller way speed control method comprises the steps of: I, mounting a braking resistor at each frequency conversion cabinet of the input roller way first section and the input roller way second section; II, judging the arrival of the tail section of the screw-thread steel based on the cutting number of the flying shear and performing closed-loop control to reduce the speeds of the input roller way first section and the input roller way second section instantly to tend to a finished product speed by a frequency converter. In addition, the frequency converter has a proportional coefficient of the closed-loop speed control corresponding to the length of the tail section of the screw-thread steel; the proportional coefficient also can be associated with temperature of a cooling bed on the tail end of the screw-thread steel. Due to the application of the roller way speed control method, the mechanical property of the steel of such type is improved, the difference of the mechanical properties at the head end and the tail end can be controlled within a narrow range of 50 MPa, and meanwhile, the production stability is also improved to a certain extent.
Description
Technical field
The present invention relates to a kind of control speed method of screw-thread steel production line, relate in particular to a kind of method of accelerating roller-way and carrying out automatic reduction of speed regulation and control.
Background technology
Large specification screw-thread steel generally refers to spiral shell 28 ~ spiral shell 50, and its rolling mill practice generally all needs to adopt the arrangement of off line frame, from K3, K5 or K7 passage, goes out finished product.Due to final pass from accelerate roller-way away from, therefore at reinforcing bar, depart from completely after milling train, just lack the power advancing, in the case, need to it, constantly accelerate by accelerating roller-way, can guarantee its normally upper cold bed.Namely, near the part of reinforcing bar afterbody, its speed of advancing is just faster; Large gauge ribbed bar, the acceleration of its afterbody just must be higher.
The production technology of hot-rolled high-strength screw-thread steel mainly contains three kinds of modes such as microalloying, Ultra-fine Grained controlled rolling and controlled cooling, quenching Self-tempering at present.
While generally producing screw-thread steel according to domestic standard, for avoiding rebar surface not occur closed loop tempered structure, all adopt microalloying technique, the additional control mode of wearing water or substantially not wearing water a little less than water section adopts of wearing after rolling.Under these circumstances, tail speed is fast, little to the Effect on Mechanical Properties of reinforcing bar.
The basic principle of quenching Self-tempering (being also referred to as Heat Treatment technique) is: first at a certain amount of martensite of stocking Surface Creation, and then utilize heart portion waste heat and the heat of transformation to make the martensite of stocking surface formation carry out self tempering, reach the object that improves stocking mechanical property.Such technique has and economizes on resources, and the outstanding advantage such as reduce production costs, enhance one's market competitiveness.
While adopting quenching Self-tempering rolling English mark screw-thread steel, must adopt high strength to wear water cooling after rolling, generally on reinforcing bar, cold bed temperature is no more than 600 ℃.
After rolling, wear in water cooling process, reinforcing bar afterbody is departing from after milling train, does not stop under acceleration accelerating roller-way, and reinforcing bar afterbody is worn the water time, and to compare other positions partially short, causes reinforcing bar by caudal part, and its mechanical property is just lower.When serious, the difference of afterbody and head often reaches 120 ~ 150MPa, and the inner quality standard of English mark B500B requires yield strength within the scope of 520 ~ 650MPa, therefore very easily occurs that the Local Mechanical Property of reinforcing bar is defective.Therefore, this technique exists the problem wayward, stocking Mechanical Fluctuation is large of producing.
Summary of the invention
In view of the defect that above-mentioned prior art exists, the object of the invention is to propose a kind of roller-way control speed method of screw-thread steel rolling.
Object of the present invention will be achieved by the following technical programs: a kind of roller-way control speed method of screw-thread steel rolling, rolling unit, the flying shear based on screw-thread steel, produced are realized, and rolling unit has 1 section of approach table, 2 sections of approach tables and accelerates roller-way, it is characterized in that described roller-way control speed method comprises:
I, in each frequency conversion tank of 1 section of approach table, 2 sections of approach tables, braking resistor is installed;
Frequency converter in II, frequency conversion tank judges the arrival of screw-thread steel rear according to the shear knife number of flying shear and carries out 1 section of the instantaneous reduction approach table of closed-loop control and the speed of 2 sections of approach tables trends towards finished product speed.
Further, the corresponding screw-thread steel rear of described frequency converter length has the proportionality coefficient of closed loop control speed, and the control speed of frequency converter is output as the product of roller-way present speed and proportionality coefficient.
Further, the temperature correlation of cold bed connection on the proportionality coefficient of described frequency converter closed loop control speed and screw-thread steel tail end.
Further, differ in 100ms the cool time that compares to head section and stage casing the cool time of rear when the roller table speed of described frequency converter control speed meets screw-thread steel and wearing water cooling.
The application of nip rolls of the present invention road control speed method, the improvement that has brought this type of steel bar mechanics performance, makes tail end poor mechanical property can be controlled at 50MPa with interior close limit, has also improved to a certain extent the steady degree of producing simultaneously.
The specific embodiment
Below just the specific embodiment of the present invention is described in further detail, so that technical solution of the present invention is easier to understand, grasp.
The roller-way control speed method of a kind of screw-thread steel rolling of the present invention, summarize and be mainly achieved through the following technical solutions: it is that the rolling unit, the program control of flying shear that based on screw-thread steel, produce are realized, and notoriously, rolling unit has 1 section of approach table, 2 sections of approach tables and accelerates roller-way, and this roller-way control speed method comprises: each frequency conversion tank in 1 section of approach table, 2 sections of approach tables is installed braking resistor; Frequency converter judges the arrival of screw-thread steel rear according to the shear knife number of flying shear in process of production and carries out 1 section of the instantaneous reduction approach table of closed-loop control and the speed of 2 sections of approach tables trends towards finished product speed.
The corresponding screw-thread steel rear of this frequency converter length has the proportionality coefficient of closed loop control speed, and the control speed of frequency converter is output as the product of roller-way present speed and proportionality coefficient.
first the operation principle of roller-way control speed:frequency conversion tank to 1 section of approach table, 2 sections of approach tables is carried out the installation of braking resistor, guarantees that approach table possesses the condition of reduction of speed.Coding, tailing depart from after finisher still can control inputs roller-way the speed of 1 section, 2 sections, its speed and finished product speed are consistent as far as possible, the cool time of prolongation reinforcing bar afterbody, strengthen its cooling effect.Possess automatic speed regulating function, according to reinforcing bar actual motion speed, carry out closed-loop control, frequency converter is carried out to speed governing in time.Finished product reinforcing bar is being departed from after finisher, and rear is wearing cool time in water pipe and the head of reinforcing bar and the time phase difference at middle part in 100 milliseconds, to reach stablizing of mechanical property.
details are as follows respectively for lime light in the time of the technical support of above principle and concrete operations:
1, for guaranteeing that frequency converter is when instantaneous speed governing, not over voltage alarm, the special braking resistor two of installing is overlapped, and to guarantee that dump energy can consume in resistance in time, is converted into heat loss and falls.
2, by the control mode to approach table, modifying, is that definite value changes speed closed loop control into by speed, according to reinforcing bar actual speed, regulates.
3, adopt the shear knife number of flying shear to judge tailing, realize identification automatically, automatically drop into, do not need manual intervention completely.
4, by judging the length of tailing, judge the also proportionality coefficient of given roller-way closed-loop control, when speedup and deceleration, avoid overshoot excessive, cause the not up to standard of mechanical property.
5, by the upper cold bed temperature of tailing, as wherein one of roller table speed control, realize multi-parameter and regulate, stablize mechanical property.
finally from two aspects, understand the effect of implementing roller-way control speed method of the present invention:
1. the variation of mechanical property:
, as can be seen from the above data, the mechanical property of reinforcing bar is poor end to end presents downward trend; Within steel bar end tail poor mechanical property can be controlled at 50MPa substantially, realized the close limit control of mechanical property.
2. the variation of the condition of production:
Once use after the automatic prompt drop function of reinforcing bar afterbody, reinforcing bar can normally be gone up cold bed, but as run into the too short phenomenon that just not there will be cold bed of tailing; Moreover be the phenomenon that knocks into the back of two reinforcing bars before and after avoiding occurring, the entering steel and will grow off time of two steel billets before and after requiring, thus output reduced to a certain extent; Though above 2 a little shortcomings that represented this programme, comparing to product rejection that reinforcing bar cannot up to standardly cause due to mechanical property or loop, to produce the cost waste causing be very little.The present invention it is emphasized that: use after the automatic prompt drop function of reinforcing bar afterbody, make the above specification of spiral shell 28 also can realize normal production without go out finished product from K1 passage, thereby be conducive to steady production, the more important thing is effective reinforcing bar mechanical property difference amplitude end to end of having controlled, meet specification and application demand.
The present invention still has numerous embodiments, and all employing equivalents or equivalent transformation and all technical schemes of forming, within all dropping on protection scope of the present invention.
Claims (4)
1. the roller-way control speed method of a screw-thread steel rolling, the rolling unit, flying shear of producing based on screw-thread steel realized, and rolling unit has 1 section of approach table, 2 sections of approach tables and accelerate roller-way, it is characterized in that described roller-way control speed method comprises:
I, in each frequency conversion tank of 1 section of approach table, 2 sections of approach tables, braking resistor is installed;
Frequency converter in II, frequency conversion tank judges the arrival of screw-thread steel rear according to the shear knife number of flying shear and carries out 1 section of the instantaneous reduction approach table of closed-loop control and the speed of 2 sections of approach tables trends towards finished product speed.
2. the roller-way control speed method of screw-thread steel rolling according to claim 1, is characterized in that: the corresponding screw-thread steel rear of described frequency converter length has the proportionality coefficient of closed loop control speed, and the control speed of frequency converter is output as the product of roller-way present speed and proportionality coefficient.
3. the roller-way control speed method of screw-thread steel rolling according to claim 2, is characterized in that: the temperature correlation of cold bed connection on the proportionality coefficient of described frequency converter closed loop control speed and screw-thread steel tail end.
4. the roller-way control speed method of screw-thread steel rolling according to claim 1, is characterized in that: when the roller table speed of described frequency converter control speed meets screw-thread steel and wearing water cooling, differ in 100ms the cool time that compares to head section and stage casing cool time of rear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310747405.7A CN103736740B (en) | 2013-12-31 | 2013-12-31 | A kind of roller-way control speed method of screw-thread steel rolling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310747405.7A CN103736740B (en) | 2013-12-31 | 2013-12-31 | A kind of roller-way control speed method of screw-thread steel rolling |
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| CN103736740A true CN103736740A (en) | 2014-04-23 |
| CN103736740B CN103736740B (en) | 2016-01-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107600960A (en) * | 2017-09-29 | 2018-01-19 | 四川德胜集团钒钛有限公司 | A kind of shifting control method of cold bed runout table |
| CN109454116A (en) * | 2018-11-06 | 2019-03-12 | 陕钢集团汉中钢铁有限责任公司 | A kind of control method of cold-bed run-in table speed |
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| CN101733291A (en) * | 2010-02-10 | 2010-06-16 | 东北大学 | Method for controlling speed of cooling roller bed after rolling medium plate |
| JP2010284695A (en) * | 2009-06-12 | 2010-12-24 | Jfe Steel Corp | Method and apparatus for determining hot rolling schedule of slab |
| CN101983786A (en) * | 2010-08-26 | 2011-03-09 | 武汉科技大学 | On-line model of motor starting time of bar finishing line separating plate and braking plate |
| CN102073294A (en) * | 2009-07-21 | 2011-05-25 | 南通宝钢钢铁有限公司 | Rolled bar cooling automatic closed-loop control system and method |
| CN103357667A (en) * | 2012-03-27 | 2013-10-23 | 上海梅山钢铁股份有限公司 | Self-adaptive control method for speed between roller bed and rolling mill |
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2013
- 2013-12-31 CN CN201310747405.7A patent/CN103736740B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010284695A (en) * | 2009-06-12 | 2010-12-24 | Jfe Steel Corp | Method and apparatus for determining hot rolling schedule of slab |
| CN102073294A (en) * | 2009-07-21 | 2011-05-25 | 南通宝钢钢铁有限公司 | Rolled bar cooling automatic closed-loop control system and method |
| CN101733291A (en) * | 2010-02-10 | 2010-06-16 | 东北大学 | Method for controlling speed of cooling roller bed after rolling medium plate |
| CN101983786A (en) * | 2010-08-26 | 2011-03-09 | 武汉科技大学 | On-line model of motor starting time of bar finishing line separating plate and braking plate |
| CN103357667A (en) * | 2012-03-27 | 2013-10-23 | 上海梅山钢铁股份有限公司 | Self-adaptive control method for speed between roller bed and rolling mill |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107600960A (en) * | 2017-09-29 | 2018-01-19 | 四川德胜集团钒钛有限公司 | A kind of shifting control method of cold bed runout table |
| CN109454116A (en) * | 2018-11-06 | 2019-03-12 | 陕钢集团汉中钢铁有限责任公司 | A kind of control method of cold-bed run-in table speed |
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| CN103736740B (en) | 2016-01-27 |
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