Novel efficient production system and process for marine profile steel

Abstract

The invention discloses a novel efficient production system and process for marine profile steel. The novel efficient production system comprises a blooming mill area, a finishing mill area, a hot sawing area, a cooling bed area, a straightening area, a cold sawing area and the like which are arranged in sequence. Wherein the cogging mill area is provided with two cogging mills which are independently arranged; a plurality of rolling mills are continuously arranged in the finishing mill area; the hot saw unit is provided with a fixed hot saw and / or a movable hot saw; a straightener is arranged in the straightening area; the sawing area is provided with a fixed cold saw and / or a movable cold saw. The rolling production efficiency problem of the small-specification marine profile steel is solved; the problems that efficient and advanced production processes such as long ruler cooling and long ruler straightening are difficult to achieve due to large bending deformation in the asymmetric section cooling process of the marine profile steel are solved. Therefore, high-efficiency and low-energy-consumption production is realized, the production cost is reduced, and the market competitiveness of enterprises is improved.

Description

Technical Field

[0001] The present invention relates to a novel high-efficiency production system and process for ship-type steel Background Art

[0002] From January to September 2024, my country's shipbuilding completion volume was 36.34 million deadweight tons; new orders were 87.11 million deadweight tons; and by the end of September, the backlog of orders was 193.3 million deadweight tons. my country's three major shipbuilding indicators accounted for 55.1%, 74.7% and 61.4% of the global total in terms of deadweight tons. By 2024, China's shipbuilding industry has maintained the world's first place in shipbuilding completion volume, new orders, and backlog orders for 14 consecutive years, with a market share of more than 50%.

[0003] The rapid development of the shipbuilding industry has put forward higher requirements on the output, quality, and variety of marine steel, especially marine steel sections. It is estimated that from 2024 to 2029, the annual demand for marine steel will be 15 million tons, of which the annual demand for marine steel sections will exceed 1.4 million tons.

[0004] Marine steel is a key structural steel for shipbuilding. It is used to manufacture ship keels and reinforcement ribs and is the core material of large ships. The commonly used marine steels in the world mainly include L-shaped steel, marine T-shaped steel, bulb flat steel, etc. Among them, the shipbuilding industries of Japan and South Korea are mainly L-shaped steel and marine T-shaped steel, while China and Europe are mainly bulb flat steel. Some marine steels, such as marine T-shaped steel, are not produced by domestic enterprises yet and are currently replaced by welded products. The bulb flat steel is composed of a flat web and a spherical ball head, and the L-shaped steel is composed of a thin long leg and a thick short leg. They are all asymmetric steels. The deformation of a single rolling process is asymmetric, and the extremely uneven and asymmetric cross-section leads to great bending deformation in the cooling section of the cooling bed, which has a great impact on the smooth production process of rolling and straightening and product quality. With the continuous development of the shipbuilding industry, marine T-shaped steel has gradually gained attention for its good structural stability, large load-bearing capacity, and steel saving. However, the marine T-steel has a T-shape with its thin and long waist and short and thick legs. However, many domestic marine steel production enterprises are not equipped with universal rolling mills and are unable to roll it. Therefore, welded T-steel is still used as a substitute in China.

[0005] Many domestic shipbuilding steel production enterprises have a rolling mill layout that is mainly horizontal, and most of the rolling mills are semi-open two-roll and three-roll rolling mills. The commonly used rolling process uses a rectangular billet through multiple cutting holes, pre-forming holes and forming holes, and finally rolls into standard bulb flat steel, L-shaped steel, unequal angle steel and other shipbuilding steel products. The production process is backward, the equipment level is low, the production efficiency is low, the rolling hole type is large, the roll investment and consumption are large, and due to the serious asymmetry of the cross section of the shipbuilding steel, the uneven cooling after rolling, and the serious bending, it has an adverse effect on straightening and finished product shape control. In addition, since there is no universal rolling mill, it is impossible to produce the shipbuilding T-shaped steel required by shipbuilding enterprises. Developing a new shipbuilding steel production process has become an important goal of domestic steel rolling mills. Summary of the invention

[0006] In order to overcome the above-mentioned defects, the object of the present invention is to provide a new and efficient production system and process for shipbuilding steel.

[0007] To achieve the above-mentioned purpose, the novel and efficient production system of ship-type steel of the present invention comprises a continuously arranged slab mill area, a finishing mill area, a hot sawing area, a cooling bed area, a straightening area and a cold sawing area; wherein,

[0008] There are two blanking machines in the blanking machine area, which are arranged separately;

[0009] The finishing mill area is equipped with multiple rolling mills, arranged in a continuous manner;

[0010] The hot saw unit is provided with a fixed hot saw and / or a mobile hot saw;

[0011] The straightening area is provided with a straightening machine;

[0012] The sawing area is provided with a fixed cold saw and / or a movable cold saw.

[0013] Furthermore, a palletizing and collecting area is provided after the cold sawing area.

[0014] Furthermore, when the system adopts the conventional pass method to produce ship-type steel, the slab rolling mill area is equipped with 2 slab rolling mills; the finishing mill area is equipped with 3-5 two-roll rolling mills to adopt the pass method to roll out a single ship-type steel; then it is segmented by a hot saw unit, and the steel is placed on a cooling bed at a fixed length, and then straightened, stacked, and bundled for collection.

[0015] Furthermore, when the system adopts the double-jointed hole-type method to produce ship-type steel, the slab rolling mill area is provided with 2 slab rolling mills, and the finishing mill area is provided with 3-5 two-roll rolling mills, and the hole-type method is adopted to roll out the double-jointed ship-type steel; thereafter, after being cut by hot sawing, the long pieces are cooled on a cooling bed, and then cut, straightened, grouped, cut to size by cold sawing, stacked, and bundled for collection.

[0016] Furthermore, when the system adopts the double-jointed universal method to produce shipbuilding steel, the slab mill area is provided with 2 slab mills, and the finishing mill area is provided with 5 universal mills and 2 edge rolling mills, a total of 7 rolling mills, and the universal mode rolls out double-jointed shipbuilding steel; thereafter, after being cut by hot sawing, the long pieces are cooled on a cooling bed, and then cut, straightened, grouped, cold sawed to size, stacked, and bundled for collection.

[0017] To achieve the above-mentioned purpose, the novel and efficient production process of shipbuilding steel of the present invention comprises a blanking step, a finishing rolling step, a hot sawing step, a cooling bed step, a straightening step and a cold sawing step in sequence.

[0018] Furthermore, a stacking and collecting step is provided after the cold sawing step.

[0019] Furthermore, when the conventional hole-forming method is used to produce ship-type steel, the blanking step is completed by two blanking machines; the finishing rolling step is performed by 3-5 two-roll rolling mills using the hole-forming method to roll out a single ship-type steel; then, the steel is segmented by a hot saw unit, placed on a cooling bed at a fixed length, and straightened, stacked, and bundled for collection.

[0020] Furthermore, when the process adopts the double-jointed hole-type method to produce ship-type steel, the blanking step is completed by two blanking machines; the finishing rolling step is performed by 3-5 two-roll rolling mills using the hole-type method to roll out the double-jointed ship-type steel; then, after the tail is cut by hot saw, the long piece is cooled on a cooling bed, and then split, straightened, grouped, cold sawed to size, stacked, and bundled for collection.

[0021] Furthermore, when the process adopts the double-jointed universal method to produce shipbuilding steel, the blanking step is completed by two blanking machines; the finishing rolling step is carried out by five universal rolling mills and two edge rolling mills, a total of seven rolling mills, using a universal mode to roll out the double-jointed shipbuilding steel; thereafter, after being cut off by hot sawing, the long pieces are cooled on a cooling bed, and then cut, straightened, grouped, cut to size by cold sawing, stacked, and bundled for collection.

[0022] The present invention solves the problem of production efficiency of rolling line for small-sized ship steel; solves the problem of large bending deformation during cooling of asymmetric cross-section of ship steel, which makes it difficult to realize efficient and advanced production processes such as long cooling and long straightening; solves the problem of being unable to produce ship T-shaped steel; solves the problems of large roll consumption, large number of spare rolls, and low rolling line utilization rate in the hole-type rolling of ship steel; thereby realizing efficient and low-energy production, reducing production costs, and improving the market competitiveness of enterprises. With the present invention, the production line can also efficiently and low-cost produce a variety of structural steel products such as H-shaped steel, tower angle steel, etc. that meet market demand, further expand the market, and enhance the risk resistance of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1The present invention is a layout diagram of an embodiment of a new type of efficient production system for shipbuilding steel.

[0024] Figure 2 It is a production method of rolling ship-type steel using the conventional hole method.

[0025] Figure 3 It is a production method for producing shipbuilding steel using the double-hole method.

[0026] Figure 4 It is the production method for producing shipbuilding steel using the double-splitting universal method.

[0027] I - flaking mill area: 1 - flaking mill one; 2 - flaking mill two; II - finishing mill area: 3 - universal / two-roller mill one; 4 - universal / two-roller mill two; 5 - edge rolling mill three; 6 - universal / two-roller mill four; 7 - universal / two-roller mill five; 8 - edge rolling mill six; 9 - universal / two-roller mill seven; III - hot saw cooling bed area: 10 - hot saw unit; 11 - cooling bed; IV - straightening area: 12 - splitting device; 13 - straightening machine; V: marshaling cold saw area: 14 - marshaling stand; 15 - cold saw unit; VI - stacking and collecting area: 16 - stacking stand; 17 - bundling device; 18 - collecting device. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Example 1

[0033] like Figure 1 As shown, a new and efficient production process for shipbuilding steel of this embodiment includes production processes such as a slab mill area, a finishing mill area, a hot saw area, a cooling bed area, a straightening area, a sawing area, and a stacking and collecting area. The slab mill area is provided with 2 slab mills, which are arranged separately; the finishing mill area is provided with 5 universal mills and 2 two-roll mills, a total of 7 mills, which are arranged continuously; the hot saw unit is provided with 2 hot saws; a cooling bed; a strip splitting and straightening machine; the cold saw unit is provided with 3 cold saws; stacking and collecting, etc.

[0034] Example 2

[0035] like Figure 2 As shown, this embodiment adopts the conventional pass-type method to roll ship-type steel. The slab mill area uses 2 slab mills and a finishing mill. The rolled piece is rolled 5-7 times by slab mill one, and then sent to slab mill two by the roller table. It is rolled 3 times by slab mill two; then it is moved to the roller table before finishing rolling by the transverse platform. According to the size of the specifications, the finishing mill group uses 3-5 two-roller rolling mills to roll out a single ship-type steel by the pass-type method; then it is segmented by the hot saw unit, and then put on the cooling bed to the fixed length, and then straightened, stacked, and bundled for collection. The conventional pass-type rolling method is the most commonly used rolling process technology at home and abroad, which is mature and reliable.

[0036] Example 3

[0037] like Figure 3 The figure shows the production method of producing ship steel by the double-joint pass method. The slab mill area uses two slab mills and a finishing mill. The rolled piece is rolled 3-7 times by slab mill one, and then sent to slab mill two by the roller table, where it is rolled 3 times; then it is moved to the roller table before finishing rolling by the transverse platform. According to the size of the specifications, the finishing mill group uses 3-5 two-roller mills to roll out double-joint ship steel by the pass method; then it is cut by hot saw, cooled on a long cooling bed, and then cut, straightened, marshaled, cut to size by cold saw, stacked, bundled and collected. The products rolled out by the double-joint pass method are made of pairs of double pieces, which solves the large bending deformation of the asymmetric section of ship steel during cooling, so that long cooling and long straightening processes can be used, which greatly improves the cooling efficiency, straightening efficiency and straightening quality; at the same time, the hot saw efficiency is improved by eliminating the segmentation of the hot saw, which greatly improves the efficiency of the production line.

[0038] Example 4

[0039] like Figure 4 As shown, this is the production method of producing shipbuilding steel using the double-splitting universal method. The rolling mill area uses two slab mills and a finishing mill group. The rolled piece is rolled 3-7 times by slab mill one, and then sent to slab mill two by the roller table. It is rolled 3 times by slab mill two; then it is moved to the roller table before finishing rolling by the transverse moving stand.

[0040] The finishing rolling unit uses 7 rolling mills, including 5 universal rolling mills and 2 edge rolling mills. The universal mode rolls out double-jointed shipbuilding steel sections. After that, they are cut by hot saws and cooled on long cooling beds. They are then split, straightened, grouped, cold sawed to size, stacked, and bundled for collection.

[0041] The double-jointed universal method, the products rolled out by the double-jointed hole method are made of pairs of double pieces, which solves the large bending deformation of the asymmetric cross-section of shipbuilding steel during the cooling process, so that long-length cooling and long-length straightening processes can be used, greatly improving the cooling efficiency, straightening efficiency and straightening quality; at the same time, due to the elimination of the hot saw segmentation, the efficiency of the hot saw is improved, and the efficiency of the production line is greatly improved.

[0042] The finishing mill adopts the universal rolling method to replace the closed hole type. Firstly, it can produce products such as ship T-shaped steel that cannot be rolled by the hole type method, thereby expanding the company's product variety. Secondly, the commonality of the rolls is improved, and the number of spare rolls of the finishing mill is reduced. Moreover, the universal method can increase the rolling amount of the rolls cut at one time, improve the utilization efficiency of the rolls, and reduce the number of roll changes, thereby realizing high-efficiency and low-energy production, reducing production costs, and enhancing the company's market competitiveness.

[0043] The present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. Many other changes and modifications that do not depart from the concept and scope of the present invention should be regarded as the protection scope of the present invention.

[0044] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0045] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A new and efficient production system for shipbuilding steel, characterized by: It includes the slab mill area, finishing mill area, hot saw area, cooling bed area, straightening area and cold saw area, etc., which are arranged in sequence. There are two blanking machines in the blanking machine area, which are arranged separately; The finishing mill area is equipped with multiple rolling mills, arranged in a continuous manner; The hot saw unit is provided with a fixed hot saw and / or a mobile hot saw; The straightening area is provided with a straightening machine; The sawing area is provided with a fixed cold saw and / or a movable cold saw.

2. The novel and efficient production system for shipbuilding steel as claimed in claim 1, characterized in that: A palletizing and collection area is provided after the cold sawing area.

3. The novel and efficient production system of shipbuilding steel as claimed in claim 1, characterized in that: When the system adopts the conventional pass method to produce ship-type steel, the slab rolling mill area is equipped with 2 slab rolling mills; the finishing mill area is equipped with 3-5 two-roll rolling mills, and a single ship-type steel is rolled out by the pass method; then it is segmented by a hot saw unit, and the steel is placed on a cooling bed at a fixed length, and then straightened, stacked, and bundled for collection.

4. The novel and efficient production system of shipbuilding steel as claimed in claim 1, characterized in that: When the system adopts the double-jointed pass method to produce ship-type steel, the slab mill area is provided with 2 slab mills, and the finishing mill area is provided with 3-5 two-roll mills, and the pass method is adopted to roll out the double-jointed ship-type steel; then, after the tail is cut by hot saw, the long length is cooled on the cooling bed, and then it is split, straightened, grouped, cold sawed to size, stacked, bundled and collected.

5. The novel and efficient production system of shipbuilding steel as claimed in claim 1, characterized in that: When the system adopts the double-jointed universal method to produce ship-type steel, the slab rolling mill area is provided with 2 slab rolling mills, the finishing mill area is provided with 5 universal rolling mills and 2 edge rolling mills, a total of 7 rolling mills, and the universal mode rolls out double-jointed ship-type steel; then, after the tail is cut by hot saw, the long piece is cooled on a cooling bed, and then it is split, straightened, grouped, cold sawed to size, stacked, and bundled for collection.

6. A new and efficient production process for shipbuilding steel, characterized by: The process comprises in sequence a blanking step, a finish rolling step, a hot sawing step, a cooling bed step, a straightening step and a cold sawing step.

7. The novel and efficient production process for shipbuilding steel as claimed in claim 6, characterized in that: A palletizing and collecting step is also provided after the cold sawing step.

8. The novel and efficient production process for shipbuilding steel as claimed in claim 6, characterized in that: When the conventional pass method is used to produce ship-type steel, the blanking step is completed by two blanking machines; the finishing rolling step is performed by 3-5 two-roll rolling mills using the pass method to roll out a single ship-type steel; then the steel is segmented by a hot saw unit, placed on a cooling bed at a fixed length, and straightened, stacked, and bundled for collection.

9. The novel and efficient production process for shipbuilding steel as claimed in claim 6, characterized in that: When the process adopts the double-jointed hole method to produce ship-type steel, the blanking step is completed by two blanking machines; the finishing rolling step is performed by 3-5 two-roll rolling mills using the hole method to roll out the double-jointed ship-type steel; then, after the tail is cut by hot saw, the long piece is cooled on a cooling bed, and then split, straightened, grouped, cold sawed to size, stacked, and bundled for collection.

10. The novel and efficient production process of shipbuilding steel as claimed in claim 6, characterized in that: When the process adopts the double-jointed universal method to produce ship-type steel, the blanking step is completed by two blanking machines; the finishing rolling step is carried out by five universal rolling mills and two edge rolling mills, a total of seven rolling mills, using a universal mode to roll out the double-jointed ship-type steel; then, after the tail is cut by hot saw, the long piece is cooled on a cooling bed, and then split, straightened, grouped, cold sawed to size, stacked, and bundled for collection.

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