CN107377632B - Temperature control system for reducing head-tail size difference of reinforcing steel bars and operation method - Google Patents
Temperature control system for reducing head-tail size difference of reinforcing steel bars and operation method Download PDFInfo
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- CN107377632B CN107377632B CN201710684682.6A CN201710684682A CN107377632B CN 107377632 B CN107377632 B CN 107377632B CN 201710684682 A CN201710684682 A CN 201710684682A CN 107377632 B CN107377632 B CN 107377632B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 229910001294 Reinforcing steel Inorganic materials 0.000 title description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 238000005096 rolling process Methods 0.000 claims description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 73
- 230000001105 regulatory effect Effects 0.000 claims description 48
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 230000003111 delayed effect Effects 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 7
- 230000001934 delay Effects 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims 5
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
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- Engineering & Computer Science (AREA)
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- Metal Rolling (AREA)
Abstract
The invention discloses a temperature control system for reducing the head-tail size difference of a steel bar and an operation method thereof.
Description
Technical Field
The invention relates to the field of steel bar processing, in particular to a temperature control system for reducing the size difference of the head and the tail of a steel bar and an operation method.
Background
The billet building materials are widely used in residences, bridges, roads and other civil engineering, the market demand is large, in recent years, with the improvement of safety consciousness of people, the requirement on the quality of billet products is higher and higher, particularly the problem of the universality of the size of the steel bars (namely the head and tail size of the steel bars is poor), and many steel mills take the problem as a key issue.
In the normal steel rolling production process, the head and tail of a rolled piece are much higher than the middle part due to the influence of a forward slip value and a backward slip value at the moment that the rolled piece bites into and breaks away from a rolling mill, so that the phenomenon that the head and tail are large in size or the longitudinal ribs exceed the standard (generally can be 0.8-1.4 mm larger than the middle part) frequently encountered in production is caused. In addition, in the production process, the temperature drop of the head and the tail of the rolled piece is much faster than that of the middle, so that the deformation resistance of the head and the tail of the rolled piece is large, and the phenomenon that the sizes of the head and the tail exceed the standard is aggravated. In the aspect of partial large specification, the waste cutting amount of 5-6 meters can be even caused.
With the adoption of a controlled rolling and controlled cooling process in a steel rolling mill, namely a water penetrating device is added between medium rolling and finish rolling to perform water penetrating and temperature controlling rolling, the performance is improved, and the production cost is reduced. The phenomenon that the sizes of the head and the tail are larger is serious, and even the head of a rolled piece is larger and cannot be bitten, so that the normal production is influenced.
Disclosure of Invention
The invention aims to provide a temperature control system for reducing the head-tail size difference of a steel bar and an operation method thereof.
The technical scheme includes that the temperature control system for reducing the head-tail size difference of the reinforcing steel bars comprises a control pipeline for controlling a pre-penetration water system, a water inlet pneumatic regulating valve, an electric valve and a water pump are connected to the control pipeline in series, and one ends of the water pump and a water return pneumatic regulating valve are connected with a cooling water pool.
Through adopting above-mentioned technical scheme, can be convenient realize the control of the water intaking of system of wearing in advance, return water at any time to realize that rolled piece head and afterbody do not wear water, or wear water intensity and control and adjust, thereby effectively weaken the system of wearing in advance and cause great size difference's influence to the reinforcing bar.
The invention is further configured to: the production line comprises a rolling line production system, the rolling line production system comprises a plurality of rolling mills, the rolling mills comprise a plurality of passes K1, K2 and K3-Kn, the K1 is a finished product pass, the K2 is a previous pass of a finished product, the K3 is a previous pass of the finished product, the Kn is an initial pass, and the control method comprises the following steps:
(1) writing a program for the pre-water passing system and inputting the program into a rolling line production system;
(2) the billet enters the rolling operation from Kn;
(3) after the head of the steel billet enters K2 pass and is delayed for a plurality of ms, the electric valve is started, the water inlet pneumatic regulating valve is opened, and the water return pneumatic regulating valve is closed;
(4) and when the tail part of the steel billet leaves the K2 pass and delays for a plurality of ms, the water inlet pneumatic regulating valve is closed, and the water return pneumatic regulating valve is opened.
By adopting the technical scheme, the head and the tail of the rolled piece do not penetrate water in the period of time that the water inlet pneumatic valve is closed and the water return pneumatic valve is opened, the deformation resistance of the head and the tail of the rolled piece is reduced, and the biting of the rolled piece is facilitated.
The invention is further configured to: after the head of the billet enters K2 pass and is delayed for 100-400ms, the electric valve is started, the water inlet pneumatic regulating valve is opened, and the water return pneumatic regulating valve is closed.
By adopting the technical scheme, the reliability of the operation work is improved through proper time control.
The invention is further configured to: when the tail of the steel billet leaves the K2 pass and delays for 1000-3000ms, the water inlet pneumatic regulating valve is closed, and the water return pneumatic regulating valve is opened.
By adopting the technical scheme, the reliability of the operation work is improved through proper time control.
The invention is further configured to: the pass speed of K1 is 2.426-15.113 m/s.
By adopting the technical scheme, through reasonable speed control, smooth processing of the reinforcing steel bars is guaranteed, and the generation of head-tail difference of the reinforcing steel bars is reduced by matching with reinforcing steel bar temperature operation control.
The invention is further configured to: the pass speed of K2 is 1.774-11.678 m/s.
By adopting the technical scheme, through reasonable speed control, smooth processing of the reinforcing steel bars is guaranteed, and the generation of head-tail difference of the reinforcing steel bars is reduced by matching with reinforcing steel bar temperature operation control.
The invention is further configured to: the K3 pass speed is 1.315-9.554 m/s.
By adopting the technical scheme, through reasonable speed control, smooth processing of the reinforcing steel bars is guaranteed, and the generation of head-tail difference of the reinforcing steel bars is reduced by matching with reinforcing steel bar temperature operation control.
The invention is further configured to: and the water inlet pneumatic regulating valve is connected with a manual regulating valve in parallel.
Through adopting above-mentioned technical scheme, when pneumatic control valve of intaking damaged to some extent, can control through manual control valve, further guarantee the standard production of reinforcing bar.
In conclusion, the invention has the following beneficial effects:
1. the phenomenon that the head of a rolled piece is too large and cannot be bitten into the rolled piece to influence normal production can be effectively weakened through a simple structure;
2. the time in the operation step is strictly and reasonably controlled, so that the reliability of the operation is ensured;
3. the speed of the rolling mill is also reasonably controlled, smooth processing of the steel bars is ensured, and meanwhile, the reliability of controlling the head-tail difference of the steel bars is also improved;
4. the emergency control device has a standby emergency control means, when the water inlet pneumatic regulating valve is damaged to some extent, the manual regulating valve can be used for controlling, and the standard production of the reinforcing steel bars is further ensured.
Drawings
FIG. 1 is a control system diagram;
FIG. 2 is a flow chart of the operation of the method of reducing the head-to-tail size difference of the bars;
FIG. 3 is a table of the relationship between different gauge billets and mill passes;
FIG. 4 is a table of the relationship between billet of different gauge and mill pass speed.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b): a temperature control system for reducing the size difference between the head and the tail of a reinforcing steel bar is shown in figure 1 and comprises a control pipeline for controlling a pre-penetration water system, wherein a water inlet pneumatic regulating valve, an electric valve and a water pump are connected to the control pipeline in series, and one ends of the water pump and a water return pneumatic regulating valve are connected with a cooling water tank.
Through the temperature control system, the water inlet and the water return of the pre-penetration system can be conveniently controlled, and the influence of the pre-penetration control on the large size difference of the head and the tail of the reinforcing steel bar can be effectively weakened by combining a correct operation method.
As shown in fig. 2, an operation method for reducing the head-tail size difference of the steel bars comprises a plurality of rolling mills for steel rolling production of steel billets, wherein the rolling mills comprise a plurality of passes of K1, K2 and K3-Kn, K1 is a finished product pass, K2 is a finished product previous pass, K3 is a finished product previous pass, and Kn is an initial pass, and the control method comprises the following steps:
(1) writing a program and setting and inputting time delay for a pre-water-passing control system according to the functional control requirement that the head and the tail of the rolled piece do not pass water;
(2) the billet is bitten by a Kn first frame rolling mill, and the rolling operation is started;
(3) after the head of the steel billet enters K2 pass and is delayed for 100-400ms, the electric valve is started, the water inlet pneumatic regulating valve is opened, and the water return pneumatic regulating valve is closed;
(4) and when the tail part of the steel billet leaves the K2 pass and delays for 1000-3000ms, closing the water inlet pneumatic regulating valve and opening the water return pneumatic regulating valve.
The above steps are now described by way of example as shown in fig. 2-4.
(1) ∅ 50 steel billet: the rolling mill comprises K1, K2, K3, K4, K5, K6, K7 and K8, wherein K1 is a 10 th rolling mill, K2 is a 9 th rolling mill, K3 is an 8 th rolling mill, K4 is a 7 th rolling mill, K5 is a 6 th rolling mill, K6 is a 5 th rolling mill, K7 is a 4 th rolling mill, K8 is a 3 rd rolling mill, the first rolling mills in K1-K8 are sequentially arranged in a production line, and K1-K8 belong to a rough and intermediate rolling process.
The head of a steel billet enters other rolling mills from a tail end rolling mill of K8 gradually to start steel rolling operation, the speed of K8 is 0.307m/s at the moment, when the head of the steel billet reaches K2 pass and is delayed for 200ms, an electric valve is started, a water inlet pneumatic regulating valve is opened, a water return pneumatic regulating valve is closed, normal water passing operation of a rolled piece of the steel billet is realized at the moment, when the tail of the steel billet completely leaves K2 pass and is delayed for 2000ms, the electric valve is started again, the water inlet pneumatic regulating valve is closed, the water return pneumatic regulating valve is opened, water passing operation is not carried out on the tail of the rolled piece at the moment, the function that the head and the tail of the rolled piece do not pass water is realized at the moment, the deformation resistance of the head and the tail of the rolled piece is reduced, the biting of the rolled piece is facilitated, and the sizes of the head and the tail are reduced by 0.
As shown in FIG. 4, in the ∅ 50 billet rolling process, the speed of K1 is 2.656m/s, the speed of K2 is 1.774m/s, the speed of K3 is 1.362m/s, the speed of K4 is 1.005m/s, the speed of K5 is 0.736m/s, the speed of K6 is 0.532m/s, the speed of K7 is 0.371m/s, and the speed of K8 is 0.307 m/s.
(2) ∅ 40 deformed steel: the device comprises K1, K2, K3, K4, K5, K6, K7, K8, K9 and K10, wherein K1 is a 14 th rolling mill, K2 is a 13 th rolling mill, K3 is a 10 th rolling mill, K4 is a 9 th rolling mill, K5 is an 8 th rolling mill, K6 is a 7 th rolling mill, K7 is a 6 th rolling mill, K8 is a 5 th rolling mill, K9 is a 4 th rolling mill, K10 is a 3 rd rolling mill, and all the rolling mills in K1-K10 are arranged in sequence in a flow line mode, wherein steel biting current and steel peeling current of a pass of the medium rolling K3(10 stands) are taken as control signals because the medium rolling 11 stands and the 12 rolling mills are empty sections; K5-K10 belong to the rough medium rolling section, and K1-K2 belong to the fine rolling section.
The head of the billet enters other rolling mills from the first rolling mill gradually to start rolling, when the head of the billet reaches K3 pass and is delayed for 200ms, the electric valve is started, the water inlet pneumatic regulating valve is opened, the water return pneumatic regulating valve is closed, and normal water passing work of the billet rolled piece is realized at the moment; when the tail of the billet completely leaves K3 passes and delays 2000ms, the electric valve is started again, the water inlet pneumatic regulating valve is closed, and the water return pneumatic regulating valve is opened, so that the operation of circulating operation is realized, and the operation that the head and the tail of the rolled piece do not penetrate through water is realized.
As shown in FIG. 4, in the ∅ 40 billet rolling process, the speed of K1 is 4.411m/s, the speed of K2 is 3.171m/s, the speed of K3 is 2.426m/s, the speed of K4 is 1.793m/s, the speed of K5 is 1.362m/s, the speed of K6 is 1.026m/s, the speed of K7 is 0.769m/s, the speed of K8 is 0.565m/s, the speed of K9 is 0.389m/s, and the speed of K10 is 0.289 m/s.
(3) ∅ 32 steel billet: the rolling mill system comprises K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, K11 and K12, wherein K1 is a 16 th rolling mill, K2 is a 15 th rolling mill, K3 is a 12 th rolling mill, K4 is an 11 th rolling mill, K5 is a 10 th rolling mill, K6 is a 9 th rolling mill, K7 is an 8 th rolling mill, K8 is a 7 th rolling mill, K9 is a 6 th rolling mill, K10 is a 5 th rolling mill, K11 is a 4 th rolling mill, K12 is a 3 rd rolling mill, all the rolling mills in K1-K12 are sequentially arranged in a production line, and steel biting current and steel releasing current of a medium-rolling K2 (11) pass are taken as control signals; so K5 is considered to be the "K3" pass; and K3-K12 belong to the rough middle rolling process, and K1-K2 belong to the fine rolling process.
The head of the billet enters other rolling mills from the first rolling mill gradually to start rolling, when the head of the billet reaches the middle rolling K2 pass (11 stands) and is delayed for 200ms, the electric valve is started, the water inlet pneumatic regulating valve is opened, the water return pneumatic regulating valve is closed, and the normal water passing work of the rolled piece is realized at the moment; when the tail of the billet completely leaves the medium rolling K2 pass (11 frames), and after the delay of 2000ms, the electric valve is started again, the water inlet pneumatic regulating valve is closed, and the water return pneumatic regulating valve is opened, so that the operation is circularly performed, and the operation that the head and the tail of the rolled piece do not penetrate through water is realized.
As shown in FIG. 4, in the ∅ 32 billet rolling process, the speed of K1 is 10.513m/s, the speed of K2 is 7.621m/s, the speed of K3 is 5.788m/s, the speed of K4 is 4.554m/s, the speed of K5 is 3.53m/s, the speed of K6 is 2.64m/s, the speed of K7 is 2.049m/s, the speed of K8 is 1.548m/s, the speed of K9 is 1.129m/s, the speed of K10 is 0.816m/s, the speed of K11 is 0.569m/s, and the speed of K12 is 0.471 m/s.
As shown in fig. 1, in this embodiment, a manual regulating valve is connected in parallel to the pneumatic regulating valve for water intake, so that when the pneumatic regulating valve for water intake is damaged, the manual regulating valve can be used for controlling, and the standard production of the steel bars is further ensured.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. An operation method for reducing the head-tail size difference of a steel bar is characterized in that: the system comprises a rolling line production system, wherein the rolling line production system comprises a plurality of rolling mills and a temperature control system; the temperature control system comprises a control pipeline for controlling the pre-penetration water system, wherein a water inlet pneumatic regulating valve, an electric valve and a water pump are connected in series on the control pipeline, one ends of the water pump and a water return pneumatic regulating valve are connected with a cooling water tank, and a manual regulating valve is connected in parallel on the water inlet pneumatic regulating valve; the rolling mill comprises a plurality of passes K1, K2 and K3-Kn, wherein the pass K1 is a finished product pass, the pass K2 is a previous pass of a finished product, the pass K3 is a previous pass of the finished product, the pass Kn is an initial pass, and the operation method for reducing the head-tail size difference of the steel bars comprises the following steps:
(1) writing a program for the pre-water passing system and inputting the program into a rolling line production system;
(2) the billet enters the rolling operation from Kn;
(3) after the head of the steel billet enters K2 pass and is delayed for a plurality of ms, the electric valve is started, the water inlet pneumatic regulating valve is opened, and the water return pneumatic regulating valve is closed;
(4) and when the tail part of the steel billet leaves the K2 pass and delays for a plurality of ms, the water inlet pneumatic regulating valve is closed, and the water return pneumatic regulating valve is opened.
2. The operating method for reducing the head-to-tail size difference of the steel bars as claimed in claim 1, wherein: after the head of the billet enters K2 pass and is delayed for 100-400ms, the electric valve is started, the water inlet pneumatic regulating valve is opened, and the water return pneumatic regulating valve is closed.
3. The operating method for reducing the head-to-tail size difference of the steel bars as claimed in claim 1, wherein: when the tail of the steel billet leaves the K2 pass and delays for 1000-3000ms, the water inlet pneumatic regulating valve is closed, and the water return pneumatic regulating valve is opened.
4. The operating method for reducing the head-to-tail size difference of the steel bars as claimed in claim 1, wherein: the pass speed of K1 is 2.426-15.113 m/s.
5. The operating method for reducing the head-to-tail size difference of the steel bars as claimed in claim 1, wherein: the pass speed of K2 is 1.774-11.678 m/s.
6. The operating method for reducing the head-to-tail size difference of the steel bars as claimed in claim 1, wherein: the K3 pass speed is 1.315-9.554 m/s.
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| CN201710684682.6A CN107377632B (en) | 2017-08-11 | 2017-08-11 | Temperature control system for reducing head-tail size difference of reinforcing steel bars and operation method |
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| CN201710684682.6A CN107377632B (en) | 2017-08-11 | 2017-08-11 | Temperature control system for reducing head-tail size difference of reinforcing steel bars and operation method |
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| CN107377632B true CN107377632B (en) | 2020-03-27 |
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Effective date of registration: 20231116 Address after: Yonglian, Nanfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: JIANGSU YONGGANG GROUP Co.,Ltd. Address before: 215600 Zhangjiagang Lianfeng Iron and Steel Research Institute Co., Ltd., Yonglian Village, Nanfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: ZHANGJIAGANG LIANFENG STEEL INSTITUTE Co.,Ltd. |