CN215032432U - Full multiple length system of rod - Google Patents

Abstract

The utility model belongs to the technical field of ferrous metallurgy industry rod production, a full multiple length system of rod is proposed, this full multiple length system is including conticaster, hydraulic pressure scale shear, the heating furnace, roughing mill group, the crop fly shear after the roughing, well rolling unit, crop and tailgating fly shear before the finish rolling in advance, finish rolling segmentation unit in advance, crop and tailgating fly shear after the finish rolling in advance, high-speed rod finishing mill group, multiple length fly shear and cold bed etc. are equipped with continuous casting billet scale unit and continuous casting billet scale unit between hydraulic pressure scale shear and the heating furnace, be equipped with middle billet scale unit on the well rolling unit. The full-scale system carries out fixed length and fixed weight measurement and calculation on a continuously cast casting blank; then, performing size and weight rechecking on the intermediate blank after the intermediate rolling; then, head cutting and tail cutting are carried out on the rolled piece after the pre-finish rolling in a length-doubling manner; and then, carrying out double-length shearing on the bar after finish rolling and controlling the double-length of the tail section to be five times or more than the target fixed length. The utility model discloses build and low in production cost, the operative employee is few, easily realizes industrial production.

Description

Full multiple length system of rod

Technical Field

The utility model belongs to the technical field of ferrous metallurgy industry rod production, concretely relates to full multiple length system of rod.

Background

The bar is one of the most important products in the steel industry, the main products of the bar comprise a deformed steel bar and a round steel bar, and the bar is widely applied to the industries of buildings, bridges, machinery, automobiles, metal products and the like. In recent years, the yield is continuously increased, and the yield reaches 3.47 hundred million tons in 2019, and the yield reaches 34.84 percent of the total amount of steel in China. The yield of the thread steel in the bar is the maximum, and accounts for 78.26 percent of the yield of the straight bar.

The bar rolling production process mainly comprises the following steps: the method comprises the following steps of hot feeding and hot charging of continuous casting billets, heating of a heating furnace, rolling of a rough and medium finishing mill set, head and tail cutting of flying shears behind the rolling mill set, cooling of water tanks in front and at the back of the finishing mill set, rolling of a reducing and sizing mill set, cooling control after reducing and sizing, shearing of double-length flying shears, cooling of a cooling bed, cold shearing and sizing, non-sizing collection, collection through a cross-frame, counting, alignment, bundling and labeling, weighing and the like. When producing deformed steel bar, especially small-sized products, a slitting rolling production process can be adopted to improve the hourly output. And part steel mills adopt a high-speed steel feeding system to produce deformed steel bars and ordinary round steel bars, and the main rolling production flow comprises the following steps: the method comprises the following steps of hot feeding and hot charging of continuous casting billets, heating of a heating furnace, rolling of a rough and medium finishing mill set, flying shear head and tail cutting after the rolling mill set, cooling of front and rear water tanks of a finishing mill set, rolling of a high-rod finishing mill set, control cooling after the high-rod finishing mill set, shearing of a double-length flying shear, cooling of a cooling bed, cold shear sizing shearing, non-sizing collection, cross-frame collection, counting, alignment, bundling and labeling, weighing and the like. However, for small-sized bar products, due to the limitation of bar production speed, hourly output is limited, and therefore, a split double high bar production mode is adopted when rolling part of the small-sized products.

No matter the bar is cut or the double-high bar is delivered in a straight bar state, a finished straight bar product is generally delivered in specifications of 9m, 12m, 16m and the like, when the bar is rolled, the blank is a fixed-length blank, the fixed-length of the blank is generally 9 m-12 m, and the total length of the rolled bar is non-integral multiple of the fixed length of the finished product. In the tables 1 and 2, the tables for calculating the multiple lengths and the tail lengths of the bars produced by the slitting rolling and the high-speed bar rolling show that when the standard billet of 150mm × 150mm is slit to produce a fixed length of 12m, short lengths of 7.44m, 8.83m, 6.49m, 3.62m, 5.68m and 9.72m appear; when the standard billet with the size of 160mm multiplied by 160mm is cut to produce the fixed length of 12m, short lengths of 5.85m, 7.06m, 6.90m, 5.30m, 6.41m and 8.92m can appear; when the standard billet high-speed bar material with the size of 12m is produced according to the standard billet high-speed bar material with the size of 150mm multiplied by 150mm, short lengths of 2.87m, 5.66m, 0.98m, 11.43m, 5.03m and 7.44m can appear; short lengths of 11.70m, 2.12m, 1.80m, 7.94m, 7.22m and 5.85m occur when producing a 12m gauge length from a 160mm by 160mm standard billet high speed bar.

Therefore, the following problems exist in the production process of the common deformed steel bar slitting bar and the production process of the high-speed bar: firstly, the blank size provided by the upstream continuous casting process has certain deviation; secondly, the crystallizer in the continuous casting process is gradually worn along with the increase of the steel passing amount, so that the size of the blank is continuously changed; thirdly, the heating temperature and the heating time of the heating furnace are different, and the burning loss amount of the iron oxide scale is different; fourthly, the rollers bounce in the rolling process, so that the size of an outlet generates deviation; fifthly, the size of an outlet is continuously changed due to abrasion of the hole shape of the roller in the rolling process; sixthly, in the splitting rolling process, line differences exist among multiple lines; and seventhly, the flying shear cuts the head and the tail in the rolling process, wherein the lengths of the head and the tail are different. All the factors can cause the length of the finished bar to deviate, the number of the finished products in non-fixed length is increased, and by combining the table 1 and the table 2, the ratio of the metal yield rate is affected by the non-fixed length to reach 2.26 percent, and the number of the finished products in non-fixed length is more due to the change of the length of the finished products caused by the factors, so that the yield rate is further affected. The increase of short length brought by production not only leads to the yield to descend, can increase follow-up finishing process work load moreover, increases human cost and cost of enterprises.

In order to solve the problem of non-sizing in the production process, part of enterprises adopt a continuous casting and rolling technology, namely single-flow continuous casting, directly enters a rolling mill for rolling without casting blank sizing, and because no casting blank is sheared and rolled head and tail exist, the non-sizing phenomenon does not exist, however, the production technology has the defects that the yield of a production line is low, the continuous casting process and the rolling process are in hard connection, the utilization rate of production line equipment is low, and the production line cannot be well adapted to the large-scale large-batch steel market of China, the single-line yield of the current production line is generally 50 ten thousand t/year, the size of a continuous casting billet needs to be greatly improved for improving the yield of the production line, so that the compression ratio is improved, the number of rolling mills is correspondingly increased, the length of the production line is increased, the occupation of fields is overlarge, and the investment cost is increased. And some enterprises adopt a headless welding and rolling technology, namely two continuous casting billets are welded head and tail to realize headless and headless rolling, but the production mode has the problems that the structure performance of a welding point is unstable, the welding point is different from a matrix, the power of a headless welding unit is high, energy is greatly wasted, the yield of finished metal is low, and the like.

On the premise of ensuring the yield of a production line, the method can reduce or even eliminate non-fixed length and short length, improve the metal yield, reduce the labor intensity of field operators and reduce the operation cost of enterprises, and is the target pursued by bar enterprises. To the non-scale that exists in present rod production, short length are many, and the metal is received the yield and is hanged down, and the problem that field operation worker intensity of labour is high is guaranteeing to produce under the prerequisite of line output, the utility model provides a rod full multiple length system can reduce non-scale proportion by a wide margin, eliminates non-scale even, reduces investment cost, improves production stability to improve metal and receive yield and rolling mill utilization ratio, reduce field operation worker intensity of labour, reduce field operation worker quantity, reduce the operation cost, improve economic benefits.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a rod full multiple length system that control is simple and convenient, construction cost is low, easily realize industrial production, and have obvious economic benefits, aim at solving the non-scale problem that appears in the production process.

The utility model discloses a realize through following technical scheme:

the utility model also provides a full multiple length system of rod, including setting up the conticaster on rod rolling production line, hydraulic pressure scale is cut, the heating furnace, the roughing mill group, the crop flying shear after the roughing mill, well rolling mill group, before the finish rolling, water-cooling tank and reply section, crop and tail-cutting flying shear before the finish rolling in advance, pre-finishing mill group, after the finish rolling, water-cooling tank and reply section, crop and tail-cutting flying shear after the finish rolling in advance, the finishing mill group, water-cooling tank and reply section behind the finishing mill group, the multiple length flying shear, double-end stopper, the hub that presss from both sides, the cooling bed rollgang of cold bed export, scale cold shear and finished product collection device, be equipped with the scale unit that is used for measuring the casting blank size between hydraulic pressure scale and the heating furnace and be used for measuring the continuous casting blank scale unit of casting blank weight, be equipped with the middle base scale unit that is used for measuring middle blank size on the roughing mill group.

Further, the continuous casting machine adopts a multi-machine multi-flow type square billet continuous casting machine; the continuous casting billet sizing unit and the intermediate billet sizing unit adopt hot metal detectors, and the continuous casting billet weighing unit adopts a weighing instrument.

Furthermore, the heating furnace is replaced by an electromagnetic induction concurrent heating system, and the head-tail temperature difference of the continuously cast bloom after concurrent heating is less than or equal to 50 ℃.

Furthermore, the inlet temperature of the pre-finishing mill group is 850-950 ℃, and the inlet temperature of the finishing mill group is 750-850 ℃.

Further, the system adopts a small-specification split double-line or large-specification single-line rolling with negative deviation when the deformed steel bar is finish rolled.

Further, the multiple length flying shear can reach a cooling bed based on the multiple length of the last bar during cutting, the multiple length is more than or equal to five times of the target fixed length, and multiple length allocation can be carried out on 2-3 bars with the reciprocal number.

Furthermore, the system also comprises a continuous casting machine crystallizer abrasion model and a continuous casting machine secondary cooling model, so that the fixed-length and fixed-weight measurement and calculation data of the casting blank are tracked in real time to control the quality, temperature and size precision of the next casting blank; the method also comprises a finish rolling mill hole pattern wear model to re-size the next casting blank; and the intermediate billet sizing unit judges the length of the intermediate billet in multiple scales according to the size of the intermediate billet after the intermediate rolling so as to re-size the next casting blank.

The working principle of the bar full-scale system is as follows:

1) continuous casting: continuous casting is carried out by adopting a multi-machine multi-strand square billet continuous casting machine, if the section size of the continuous casting billet is 150mm multiplied by 150 mm-180 mm multiplied by 180mm, the continuous casting billet is subjected to fixed-length cutting by hydraulic fixed-length shears after being cooled in a continuous casting secondary cooling area and straightened by a withdrawal and straightening machine;

2) sizing and weighing of the continuous casting blank: measuring the section size and the continuous casting billet length of each continuous casting billet by a continuous casting billet sizing unit after cutting, calculating the weight of the continuous casting billet according to the size parameters, measuring the weight of the continuous casting billet by a continuous casting billet sizing unit, comparing the measured weight with the previously calculated weight, correcting the weight of the continuous casting billet calculated by the size parameters, giving a signal if the size precision of the final continuous casting billet does not meet the process requirements, and replacing a continuous casting crystallizer;

3) heating or concurrent heating of continuous casting billets: if a direct rolling process is adopted, after the continuous casting billet treated in the step 2) is conveyed by a heat-preservation quick roller way, frequency conversion or variable power electromagnetic induction heat compensation is carried out according to the head and tail temperature of the continuous casting billet so as to meet the requirements of the rolling process; if a heating furnace is adopted for heating, the temperature of a casting blank is heated and kept warm by multi-stage heating control in the heating furnace, and after the two heating modes, the temperature of the continuous casting blank is 900-1250 ℃, and the temperature difference between the head and the tail is less than or equal to 50 ℃;

4) rolling by a rough and medium rolling mill set: performing multi-pass rolling on the square billet heated in the step 3) by adopting a horizontal-vertical alternative or flat-roll rolling mode, wherein when a roughing mill set is used for rolling, hole-free rolling and hole-pass rolling can be adopted, when the hole-pass rolling is adopted, the roughing mill set is a box-ellipse-round hole system, when the hole-pass rolling is adopted, a guide and guard are arranged at the front and the rear of each rolling mill, a flying shear is arranged behind the roughing mill set for cutting the head, and a flying shear is arranged behind a middle rolling mill set for cutting the head and the tail;

5) detecting a middle blank after the middle rolling mill set and performing multiple length accounting: detecting the intermediate blank after the flying shears cut at the head and the tail after the intermediate rolling in the step 4) by adopting a hot metal detector, calculating the weight of the intermediate blank at the moment according to the material type parameter and the rolling speed of the last frame of the intermediate rolling mill set, and calculating the weight of a rolled piece, the final finished product length and a multiple cutting control scheme according to a full multiple system;

6) controlling cooling and rolling in front and at back of a pre-finishing mill set: carrying out water tank cooling and air cooling section reversion before pre-finish rolling on the rolled piece treated in the step 5), then carrying out rolling of a pre-finishing mill set, and carrying out water cooling temperature control after the rolling of the pre-finishing mill set so as to ensure that the temperature of the rolled piece entering a finishing mill set meets the process requirements;

7) pre-finishing mill set front flying shear cutting: and 6) performing head cutting and tail cutting treatment on the rolled piece in the step 6). When cutting the head, setting the length of the cutting head according to the process requirement; during tail cutting, calculating the tail cutting length according to the weight of the rolled piece calculated in the step 5), the material type size of the rolled piece subjected to pre-finish rolling in the step 6) and the length of the cut head, and ensuring that the cut rolled piece has the length of multiple lengths;

8) rolling and controlled cooling after rolling by a finishing mill set: carrying out finish rolling unit rolling on the rolled piece treated in the step 7), carrying out controlled cooling after rolling, carrying out online roll gap adjustment according to a measurement result of the size precision of a finished product after hole patterns are worn, and adopting a way of inter-pass adjustment to ensure the product strip passing property during adjustment;

9) cutting at multiple scales: after passing through a pinch roll before the high-speed flying shear, the rolled piece processed in the step 8) is subjected to multiple-length shearing by using a fixed-length high-speed flying shear, and then the rolled piece is conveyed into a guide groove by the pinch roll after passing through the high-speed flying shear respectively, and the rolled piece is conveyed, if the multiple-length of the last section is five times or more than the final fixed length, the rolled piece is sheared according to the length of a cooling bed during multiple-length shearing, and optimization is not needed; if the length of the last section is less than five times of the final fixed length, optimized shearing is needed, namely the length of the multiple length during the shearing of the third section and the second section from the last and the length of the last section are optimized, so that the requirement that the length of the multiple length is more than five times of the fixed length is met, and the requirement of the upper cooling bed process is met;

10) high-speed steel feeding: conveying the rods subjected to multi-length shearing in the step 9) to a cooling bed through a double-channel guide groove, and cooling rolled pieces falling onto a rack of the cooling bed through a tail clamping brake and a rotating hub;

11) sizing and collecting: and (3) carrying out fixed-length cold shearing on the bar cooled by the cooling bed in the step 10), collecting, counting, bundling, labeling and weighing by using a cross inspection rack, and then transporting the bar to a finished product warehouse by using a crown block or a horizontal plane vehicle for collection.

The utility model has the advantages that:

1. the utility model discloses the full multiple length system of rod is compared with ordinary segmentation rod production line and high-speed rod production line, fully consider continuous casting crystallizer wearing and tearing, roll pass wearing and tearing, flying shear cuts end to end length, can reduce non-scale proportion by a wide margin, the short length that significantly reduces and non-multiple length rod, eliminate non-scale even, make the computational accuracy high, and the investment cost is low, in order to improve production stability, and improve metal yield and rolling mill high-usage, and reduce on-the-spot operative employee intensity of labour, equipment fault rate is low, reduce on-the-spot operative employee's quantity, reduce the operation cost, and economic benefits is improved.

2. The utility model discloses combine the continuous casting billet scale unit, conticaster crystallizer wearing and tearing model, two cold cooling models of conticaster of continuous casting cooling process cooling state, well roll back intermediate billet size detection, weight recheck and multiple length judgement, the multiple length cutting of crop tail-cutting guarantees after the finish rolling in advance, and the finish rolling mill pass wearing and tearing model that has online roll gap adjustment comes the full multiple length technique of realization closed loop jointly to the multiple length that realizes a last rod can go up the cooling bed cooling. The control system and the control method have the advantages of low construction cost, low production cost, few operators, easy realization of industrial production and obvious economic benefit.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.

Drawings

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in which:

fig. 1 is the whole multi-length system layout diagram of the bar (two small-sized divisions) of the present invention.

Fig. 2 is the whole multi-length system layout diagram of the bar (large specification is not cut).

Fig. 3 is the rod full-scale system principle sketch of the utility model.

Reference numerals: the device comprises a continuous casting machine 1, a hydraulic sizing shear 2, a continuous casting billet sizing unit 3, a continuous casting billet sizing unit 4, a heating furnace 5, a roughing mill group 6, a roughing mill group 7, a roughing post-crop flying shear 8, a middle mill group, a pre-finishing pre-rolling pre-cooling water tank and a return section 9, a pre-finishing pre-rolling pre-crop flying shear 10, a pre-finishing pre-rolling pre-finishing mill group 11, a pre-finishing mill splitting group 11', a pre-finishing post-cooling water tank and a return section 12(121, 122), a pre-finishing post-cooling water tank and a return section 13(131, 132), a pre-finishing post-crop flying shear and a tail-cutting flying shear 14(141, 142), a finishing mill group 15(151, 152), a finishing mill post-cooling water tank and a return section 16, a double-length flying shear 17, a tail clamping brake 18, a rotating hub 19, a cooling bed 20, a cooling bed output roller table 21, a sizing shear 22, a finished product collecting device 22 and an intermediate billet sizing unit 23.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.

As shown in fig. 2, the utility model provides a full multiple length system of rod, including setting up conticaster 1 on the rod rolling production line, hydraulic pressure scale shear 2, continuous casting billet scale unit 3, continuous casting billet scale unit 4, heating furnace 5, roughing mill group 6, after-roughing crop fly shear 7, well rolling mill group 8, before the preliminary finish rolling water-cooling box and reply section 9, before the preliminary finish rolling crop and tail-cutting fly shear 10, pre-finishing mill group 11, after-roughing mill water-cooling box and reply section 12, after-finishing mill crop and tail-cutting fly shear 13, finishing mill group 14, after-finishing mill group water-cooling box and reply section 15, multiple length fly shear 16, double tail stopper 17, rotary hub 18, cold bed 19, cold bed run-out roller table 20, scale cold shear 21, finished product collection device 22 and middle base scale unit 23. The continuous casting billet sizing unit 3 and the continuous casting billet weight determining unit 4 are used for sizing and weight determining of a continuously cast casting billet, and the intermediate billet sizing unit 23 is arranged on the intermediate mill unit and used for detecting the size of the intermediate billet and calculating the weight of the intermediate billet according to the detected size.

The continuous casting machine 1 in the embodiment adopts a multi-machine multi-flow type square billet continuous casting machine; the continuous casting billet sizing unit 3 and the intermediate billet sizing unit 23 can adopt hot metal detectors, and the continuous casting billet weight determining unit 4 adopts a weighing instrument.

The heating furnace in the embodiment can be replaced by an electromagnetic induction concurrent heating system, and the head-to-tail temperature difference of the continuous casting billet subjected to concurrent heating by the heating furnace or the electromagnetic induction concurrent heating system is less than or equal to 50 ℃.

The pre-finishing rolling mill group 11 in this embodiment performs a single-line rolling of a large specification, and may also include a splitting device to form a pre-finishing splitting mill group 11', such as a two-split rolling of a small specification shown in fig. 1; and the inlet temperature of the pre-finishing mill group 11 or the pre-finishing mill splitting group 11' is 850 ℃ to 950 ℃, and the inlet temperature of the finishing mill group 14 is 750 ℃ to 850 ℃.

The present system in this example uses a negatively biased small gauge slit twin-wire rolling or a large gauge single-wire rolling when finish rolling deformed steel bars.

In the embodiment, the multiple-length flying shears 16 can move to the cooling bed based on the multiple length of the last bar during cutting, the multiple length is not less than 5 times of the target fixed length, and multiple length allocation can be performed on 2-3 bars with the reciprocal number.

The system in the embodiment also comprises a continuous casting machine crystallizer abrasion model and a continuous casting machine secondary cooling model, so that the fixed-length and fixed-weight measurement and calculation data of the casting blank are tracked in real time to control the quality, temperature and size precision of the next casting blank; the method also comprises a finish rolling mill hole pattern wear model to re-size the next casting blank; and the intermediate billet sizing unit judges the length of the intermediate billet in multiple scales according to the size of the intermediate billet after the intermediate rolling so as to re-size the next casting blank.

Example 1(165 mm. times.165 mm continuous casting slab producing phi 12mm deformed steel bar)

Referring to fig. 1 and fig. 3, table 3 and table 5 according to the present invention, the production process sequence includes the following:

1) continuous casting: adopting a four-machine four-flow square billet continuous casting machine 1 to carry out 20MnSi continuous casting, wherein the continuous casting drawing speed is 4.0m/min, the section size of the continuous casting billet is 165mm multiplied by 165mm, carrying out fixed-length cutting on the continuous casting billet by a hydraulic fixed-length shear 2 after cooling in a continuous casting secondary cooling area and straightening by a straightening machine, and the size parameter of the cut casting billet is 165mm (width) multiplied by 165mm (height) multiplied by 12000 (length);

2) sizing the continuous casting blank: sequentially feeding the continuous casting billets cut to length in the step 1) into respective corresponding continuous casting billet length determining units 3 for measurement, such as a hot metal detector, correcting the size of the cross section of the four-flow continuous casting billet after measurement to be 165.03mm (width) x 165.03mm (height) x 12005 (length), and calculating the weight of the continuous casting billet to be 2.52t according to the size parameters;

3) weight fixing of the continuous casting billet: carrying out measurement and accounting on the continuous casting billet subjected to the sizing measurement in the step 2) by a continuous casting billet sizing unit 4, wherein the weight of the continuous casting billet is 2.52t after the measurement;

4) heating or concurrent heating of continuous casting billets: and (3) conveying the continuously cast bloom subjected to the fixed weight measurement in the step 3) through a heat-insulating quick roller way, and then performing electromagnetic induction heat compensation (or a heating furnace 5), wherein variable-frequency or variable-power heat compensation is adopted in the heat compensation process so as to meet the requirements of the rolling process. After heating, the temperature of the continuous casting billet is 950 +/-50 ℃, and the head-tail temperature difference is less than or equal to 50 ℃;

5) rough rolling and end cutting after rolling: carrying out six-pass rolling on the square billet heated in the step 4) by adopting a non-hole rolling mode, wherein the inlet speed of a roughing mill set is 0.34m/s, the outlet speed of the roughing mill set is 1.73m/s, the average elongation of the passes is 1.31, the outlet size of the roughing mill set 6 is 74mm multiplied by 74mm, the temperature of the rolled piece after roughing is 900-950 ℃, and after finishing the rolling of the roughing mill set, cutting the rolled piece by a head cutting flying shear 7 after roughing, wherein the length of the cut head is 80 mm;

6) intermediate rolling, detection and multiple length accounting of intermediate blanks after rolling: carrying out six-pass rolling by a middle rolling mill group 8 on the intermediate blank after rough rolling in the step 5) by adopting a box-type-ellipse-circle pass system, wherein guides and guards are arranged at the front and the rear of a rolling mill, the inlet speed of the middle rolling mill group is 1.73m/s, the outlet speed of the middle rolling mill group is 7.17m/s, the average elongation of the passes is 1.27, the outlet size of the middle rolling mill group is phi 41.0mm, the temperature of a rolled piece after middle rolling is 850-1000 ℃, carrying out size detection on the rolled piece after middle rolling by adopting a middle blank sizing unit 23 such as a hot metal detector, and calculating to obtain the weight 2.517t of the intermediate blank at the moment by combining with the speed parameter of a last section of a rack;

7) pre-finish rolling, cooling control and front flying shear cutting: feeding the rolled piece treated in the step 6) into a water cooling box and a return section 9 before pre-finish rolling; then the head and tail cutting treatment is carried out by a head and tail cutting flying shear 10 before pre-finish rolling. When cutting the head, the length of the cut head is 250mm, and the length of the cut tail is 100 mm;

8) pre-finish rolling and splitting rolling: the rolled piece enters a pre-finish rolling segmentation unit 11', the rolling pass is six passes, guides and guards are arranged at the front and the rear of the rolling mill, the inlet speed of the unit is 7.17m/s, the outlet speed is 17.06m/s, the average elongation of the passes is 1.16, the outlet size of the unit is phi 18.8mm multiplied by 2, the inlet temperature of the pre-finish rolling is 850-950 ℃, and the rolled piece enters a water cooling box and recovery sections 121 and 122 after the two passes of segmentation rolling respectively after the pre-finish rolling so as to ensure that the temperature of the rolled piece entering the finishing mill units 141 and 142 meets the rolling process requirement of 750-850 ℃;

9) cutting by flying shears after pre-finish rolling: and (3) respectively performing head cutting and tail cutting treatment on the two rolled pieces obtained in the step 8) through pre-finish rolling and head cutting and tail cutting flying shears 131 and 132. The length of the crop end is 200mm multiplied by 2, the length of the crop end of the rolled piece is 142 multiplied by 2mm according to the rolled piece weight calculated in the step 6), the material type size and the crop end length of the rolled piece after pre-finish rolling in the step 7) and the crop end length in the step 9), and cutting operation is carried out to ensure that the cut rolled piece has the length of multiple scales;

10) finish rolling and controlled cooling after rolling: carrying out double-line rolling on the two paths of rolled pieces processed in the step 9) by a finishing mill group 141 and 142, wherein the rolling pass of each line is four, the front and the back of the rolling mill are respectively provided with a guide, the inlet speed of the rolling mill group is 17.06m/s, the outlet speed of the rolling mill group is 40.78m/s, the average elongation of the pass is 1.24, the inlet temperature of the rolling mill group is 750-850 ℃, if the rolling of the deformed steel bar is carried out, negative deviation rolling can be adopted, and the rolled two paths of rolled pieces enter a water cooling box and return sections 151 and 152 of the finishing mill group for controlled cooling;

11) cutting at multiple scales: and (3) after the rolled piece processed in the step 10) passes through a pinch roll in front of a multi-length flying shear 16, carrying out multi-length shearing by using a multi-length flying shear with fixed length and high speed, wherein the length of a cooling bed 19 is 120m, the first 12 pieces are sheared by adopting 9 times of 12m fixed length at the moment, the 13 th piece is sheared by adopting 6 times of 12m fixed length at the time of the multi-length, and the 14 th piece (the last piece) is sheared by adopting 5 times of 12m fixed length, so that the fixed length is ensured, and the last multi-length piece can be cooled on the cooling bed. Or the first 11 pieces are cut by using 9 times of 12m fixed length, the second 12 pieces are cut by using 7 times of 12m fixed length, the third 13 pieces are cut by using 7 times of 12m fixed length, and the fourth 14 pieces (the last piece) are cut by using 6 times of 12m fixed length;

12) high-speed steel feeding: conveying the rolled piece subjected to multi-length shearing in the step 11) to a cooling bed 19, and cooling the rolled piece after the rolled piece passes through a tail clamping brake 17 and a rotating hub 18 and falls onto a rack of the cooling bed 19;

13) sizing and collecting: outputting the bar cooled by the cooling bed in the step 12) from a cooling bed output roller table 20, entering a fixed-length cold shear 21 for shearing, collecting, counting, bundling, labeling and weighing through a cross inspection rack, and transporting to a finished product collecting device 22 through a finished product warehouse crown block or a horizontal plane vehicle;

14) and (3) wear of a crystallizer: after the single-flow continuous casting machine passes through the steel for 2000t, the crystallizer is abraded, real-time tracking calculation is carried out through a continuous casting machine crystallizer abrasion model, and the steps 2) -13) are repeated;

15) wear of the hole pattern: and (3) after the single-line finishing mill group rolls for 800t, the hole pattern is worn, the next steel is subjected to online roll gap adjustment according to the measurement result of the size precision of the finished product and is continuously rolled, the step 7) -the step 9) are repeated in the multiple length calculation process, the multiple length is optimized, and the step 11) is repeated.

Example 2(165 mm. times.165 mm continuous casting slab production phi 20mm screw-thread steel)

Referring to fig. 2, fig. 3, table 4 and table 5 according to the present invention, the production process sequence includes the following:

1) continuous casting: adopting a three-machine three-flow square billet continuous casting machine 1 to carry out 20MnSi continuous casting, wherein the continuous casting drawing speed is 4.1m/min, the section size of the continuous casting billet is 165mm multiplied by 165mm, carrying out fixed-length cutting on the continuous casting billet by a hydraulic fixed-length shear 2 after cooling in a continuous casting secondary cooling area and straightening by a withdrawal and straightening machine, and the size parameter of the cut casting billet is 165mm (width) multiplied by 165mm (height) multiplied by 12000 (length);

2) sizing the continuous casting blank: sequentially feeding the continuous casting billets cut to length in the step 1) into respective corresponding continuous casting billet sizing units 3 for measurement, correcting the size of the cross section of the continuous casting billets cut to length in the step 1 to be 165.03mm (width) x 165.03mm (height) x 12005 (length), and calculating the weight of the continuous casting billets to be 2.52t according to the size parameters;

3) the continuous casting billet is heavy: carrying out measurement and accounting on the continuous casting billet subjected to the sizing measurement in the step 2) by a continuous casting billet sizing unit 4, wherein the weight of the continuous casting billet is 2.52t after the measurement;

4) heating or concurrent heating of continuous casting billets: and (3) after the continuous casting billet subjected to the fixed weight measurement in the step 3) is conveyed through a heat-preservation quick roller way, heat compensation is carried out on the continuous casting billet by a heating furnace 5, and variable-frequency or variable-power heat compensation is adopted in the heat compensation process so as to meet the requirements of the rolling process. After heating, the temperature of the continuous casting billet is 950 +/-50 ℃, and the head-tail temperature difference is less than or equal to 50 ℃;

5) rough rolling and end cutting after rolling: the roughing mill group 6 is used for carrying out six-pass rolling on the square billet heated in the step 4) in a non-pass rolling mode, the inlet speed of the roughing mill group is 0.21m/s, the outlet speed of the roughing mill group is 1.05m/s, the average elongation of the passes is 1.31, the outlet size of the roughing mill group is 74mm multiplied by 74mm, the temperature of the rolled piece after roughing is 900-950 ℃, the rolled piece is cut by a head cutting flying shear 7 after roughing after finishing the rolling of the roughing mill group, and the length of the cut head is 80 mm;

6) intermediate rolling, detection and multiple length accounting of intermediate blanks after rolling: carrying out six-pass rolling by a middle rolling mill group 8 on the intermediate blank after rough rolling in the step 5) by adopting a box-ellipse-circle pass system, wherein guides and guards are arranged at the front and the rear of a rolling mill, the inlet speed of the middle rolling mill group is 1.05m/s, the outlet speed of the middle rolling mill group is 4.34m/s, the average pass elongation is 1.27, the outlet size of the middle rolling mill group is phi 41.0mm, the temperature of a rolled piece after middle rolling is 850-1000 ℃, carrying out size detection on the rolled piece after middle rolling by adopting a hot metal detector after middle rolling, and calculating to obtain the weight of the intermediate blank 2.517t by combining the speed parameter of a last section of a rack;

7) cutting by flying shears before pre-finish rolling: and (3) performing head cutting and tail cutting treatment on the rolled piece in the step 6) through a head cutting and tail cutting flying shear 10 before pre-finish rolling. When cutting the head, the length of the cut head is 250mm, and the length of the cut tail is 100 mm;

8) controlling cooling and rolling before pre-finish rolling: the rolled piece treated in the step 6) enters a water cooling tank and a return section 9 before pre-finish rolling, then a pre-finishing rolling unit 11 is used for rolling, the rolling pass is six passes, guides and guards are arranged at the front and the rear of the rolling mill, the inlet speed of the pre-finishing rolling unit is 4.34m/s, the outlet speed of the pre-finishing rolling unit is 11.22m/s, the average elongation of the pass is 1.27, the outlet size of the pre-finishing rolling unit is phi 25.5 mm, the inlet temperature of the pre-finish rolling is 850-950 ℃, and then the rolled piece enters a water cooling tank and a return section 12 after the pre-finish rolling so as to ensure that the temperature of the rolled piece entering a finishing rolling unit 14 meets the rolling process requirement of 750-850 ℃;

9) cutting by flying shears after pre-finish rolling: and (3) performing head cutting and tail cutting treatment on the rolled piece in the step 8) by using a pre-finish rolling head cutting and tail cutting flying shear 13. The length of the crop end is 400mm, the length of the crop end is 308mm according to the weight of the rolled piece calculated in the step 6), the material shape size and the crop end length of the rolled piece after pre-finish rolling in the step 7) and the length of the crop end calculated in the step 9), and cutting operation is carried out to ensure that the final finished product after the crop end is the length of multiple lengths;

10) finish rolling and controlled cooling after rolling: rolling the rolled piece treated in the step 9) by a finishing mill group 14, wherein the rolling passes are four passes, guides and guards are arranged before and after the rolling mill, the inlet speed of the finishing mill group is 11.22m/s, the outlet speed is 17.77m/s, the average elongation of the passes is 1.24, the finish rolling inlet temperature is 750-850 ℃, the deformed steel bar can be rolled by adopting negative deviation when being rolled, and the rolled piece is controlled and cooled by a rear water cooling box of the finishing mill group and a return section 15 after being rolled;

11) cutting at multiple scales: and (3) after the rolled piece processed in the step 10) passes through a pinch roll in front of the high-speed multi-length flying shear 16, carrying out multi-length shearing by using a fixed-length high-speed multi-length flying shear, wherein the length of a cooling bed 19 is 120m, the first 9 pieces are cut in fixed length of 9 times x 12m, the 10 th piece (the last piece) is cut in fixed length of 5 times x 12m, the fixed length is ensured, and the last multi-length piece can be cooled on the cooling bed. Or the first 8 pieces are cut by using the fixed length of 9 times 12m, the 9 th piece is cut by using the fixed length of 7 times 12m, and the 10 th piece (the last piece) is cut by using the remaining fixed length of 7 times 12 m;

12) high-speed steel feeding: conveying the rods subjected to multi-length shearing in the step 11) to a cooling bed 19, and allowing rolled pieces to fall onto racks of the cooling bed 19 through a tail clamping brake 17 and a rotating hub 18 and cooling;

13) sizing and collecting: and (3) feeding the bar cooled by the cooling bed in the step 12) into a sizing cold shear 21 for shearing through a cooling bed output roller way 20, collecting, counting, bundling, labeling and weighing through a cross inspection rack, and then transporting the bar to a finished product collecting device 22 through a finished product warehouse crown block or a horizontal plane vehicle.

14) And (3) wear of a crystallizer: after the uniflow continuous casting machine passes through the steel for 2000t, the crystallizer is abraded, real-time tracking calculation is carried out through a continuous casting machine crystallizer abrasion model, and the steps 2) -13) are repeated;

15) wear of the hole pattern: and (3) after the single-line finishing mill group rolls for 800t, the hole pattern is worn, the next steel is subjected to online roll gap adjustment according to the measurement result of the size precision of the finished product and is continuously rolled, the step 7) -the step 9) are repeated in the multiple length calculation process, the multiple length is optimized, and the step 11) is repeated.

The utility model has the advantages of that:

1) the flow number and the continuous casting speed of the continuous casting machine are matched with the rolling specification and speed, no wire blank is discharged, and the product yield is high;

2) the continuous casting machine is provided with a continuous casting machine crystallizer abrasion model and a continuous casting machine secondary cooling model in a cooling state in a continuous casting cooling process, and the working state and the casting blank state of the continuous casting machine can be monitored in real time;

3) after the continuous casting sizing cutting, a continuous casting blank sizing unit and a continuous casting blank weight unit are used for checking the size and the weight of the casting blank, and the calculation deviation is small;

4) the continuous casting billet is heated by an electromagnetic induction heat supplementing or heating furnace, and frequency conversion or variable power heat supplementing is adopted in the heat supplementing process, so that the head-tail temperature difference is small, and the product performance is stable;

5) the hot metal detector is adopted behind the intermediate mill unit to detect the size of the rolled piece after intermediate rolling, the weight of the intermediate blank is accurately calculated by combining the speed parameter of the end section of the frame, and the full-multiple-length system has high control precision;

6) the rear flying shear of the pre-finishing mill set cuts according to the full-multiple length requirement, the final finished product after tail cutting is ensured to be multiple length, and the cutting precision is high;

7) the product has wide production specification range, and can produce all deformed steel bars in the specification range of phi 6.0mm to phi 50.0mm and all round steel bar products in the specification range of phi 16.0mm to phi 90.0 mm; the small specification adopts slitting rolling, the large specification adopts single rolling, and the production is flexible;

8) the finishing mill group adopts a single rolling method, the product size precision is high, the deformed steel bar negative deviation rolling can be realized, and the metal yield is improved;

9) the multi-length shearing is based on shearing data of rough rolling rear flying shears, middle rolling rear flying shears and pre-finish rolling rear flying shears, and system optimization is carried out on 2-3 reciprocal multi-lengths in consideration of the requirement of multi-length steel feeding, so that the production is stable and reliable;

10) the wear of the crystallizer and the wear of the hole pattern are considered, the online roll gap adjustment can be realized, the production is flexible, and the product size precision is high;

11) the production line has high yield, high hourly output of the production line, high rolling mill efficiency of the production line, full-scale and fixed length, small temperature difference between the head and the tail of the bar, uniform size and stable performance;

12) the unmanned operation of the finishing area can be realized, and the labor cost is greatly reduced.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. A full-scale system of bars comprises a continuous casting machine (1), a hydraulic sizing shear (2), a heating furnace (5), a roughing mill group (6), a cutting head flying shear (7) after roughing rolling, a middle mill group (8), a water cooling box and a return section (9) before roughing rolling, a cutting head and a return section (10) before roughing rolling, a pre-finishing mill group (11), a water cooling box and a return section (12) after roughing rolling, a cutting head and a return section (13) after roughing rolling, a finishing mill group (14), a water cooling box and a return section (15) after finishing mill group, a sizing flying shear (16), a tail clamping brake (17), a rotating hub (18), a cooling bed (19), a cooling bed output roller bed (20), a sizing cold shear (21) and a finished product collecting device (22) which are arranged on a bar rolling production line, and is characterized in that a sizing unit (3) for measuring the size of a casting blank and a sizing unit (4) for measuring the weight of the casting blank are arranged between the hydraulic sizing shear and the heating furnace, and an intermediate billet sizing unit (23) for measuring the size of the intermediate billet is arranged on the intermediate mill group.

2. The full multi-length bar system according to claim 1, wherein the continuous casting machine employs a multi-machine multi-flow billet continuous casting machine; the continuous casting billet sizing unit and the intermediate billet sizing unit adopt hot metal detectors, and the continuous casting billet weighing unit adopts a weighing instrument.

3. The full-length-multiplying system for bars according to claim 1, wherein the heating furnace is replaced by an electromagnetic induction concurrent heating system, and the temperature difference between the head and the tail of the continuously cast bars after concurrent heating is less than or equal to 50 ℃.

4. The full multi-length bar system according to claim 1, further comprising a continuous casting machine crystallizer wear model and a continuous casting machine secondary cooling model for real-time tracking of the sizing and re-sizing data of the casting slab.

5. The rod full octave system of claim 1, further comprising a finishing mill pass wear model for on-line roll gap adjustment of a finishing mill train.

6. The full-length bar system according to claim 1, wherein the inlet temperature of the pre-finishing mill group is 850 ℃ to 950 ℃ and the inlet temperature of the finishing mill group is 750 ℃ to 850 ℃.

7. The full-length bar system according to claim 1, wherein a negatively biased small gauge slit twin or large gauge single line is used for finish rolling of the deformed steel bar.

8. The full multi-length system for bars according to claim 1, wherein the multi-length flying shears are based on the multi-length of the last bar going to the cooling bed when cutting, and the multi-length is more than or equal to five times the target fixed length.

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