Production process for shared sleeve-rolled flat steel with specification difference of 10-30 mm

Abstract

The invention discloses a production process for shared sleeve rolling flat steel with the specification difference of 10-30 mm. The production process comprises the steps that a hole pattern system used by a continuous rolling unit is a box-shaped hole, the form of the box-shaped hole is that vertical rolling mills, flat rolling mills and vertical rolling mills are alternately arranged, and the flat steel with the specification difference of 10-30 mm is subjected to shared sleeve rolling; blanks pass through a continuous rolling unit and are alternately configured through a flat rolling mill and a vertical rolling mill, the electrode flat steel of the first specification is subjected to continuous rolling for four lathes to obtain finished products, then two rolling mills are added, the finished products are obtained through six lathes, and the electrode flat steel with the specification 10-30 mm smaller than the height and width of the four lathes is rolled. According to the method, sleeve rolling is achieved on the condition that flat steel with the diameter difference of 10-30 mm is not shared completely, roller storage and roller replacement time is shortened, flat steel with the roller difference of 20-30 mm is shared, storage of rollers and guide and guard devices of 2-4 rolling mills is reduced, and roller consumption and spare part consumption are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of metal processing, and in particular relates to a production process for common sleeve-rolled flat steel with a specification difference of 10-30mm. Background Art

[0002] The main technical equipment of the continuous rolling production line includes a Φ850mm two-roller reversible billet opening machine, a Φ700mm×3+Φ550mm×4 continuous rolling mill set with short stress line and high rigidity arranged in alternating horizontal and vertical directions, which is mainly used for the production of electrode flat steel and round steel. Before the improvement, according to the existing design, the series of flat steel finished products produced by our factory can be shared within the range of 5-10mm difference in height, while the hole type of flat steel with a difference of 10-30mm in height and width cannot be shared;

[0003] The finished flat steel products with a height difference of 5-10mm all have a separate set of hole type systems, and there is no shared relationship between the hole type systems of adjacent specifications with a height and width difference of 10-30mm. Under this mode, the disassembly and assembly and roll replacement of electrode flat steels with a height and width difference of 10-30mm are relatively frequent, the workload of rolling mill replacement is large, and the labor intensity of employees is high.

[0004] The existing commonly rolled flat steel varieties are 200×240mm, 180×220mm (or 180×230mm); the hole patterns of these two flat steel specifications with a difference of 10-30mm in height and width have not yet been shared for rolling, resulting in a large number of racks in use, a large reserve of rolls and unfavorable management, and a long time for roll changing and adjustment, affecting hourly output. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a production process that can be used to roll flat steel with a difference of 10-30mm in specifications, so as to realize the common rolling of the pass profiles of flat steels with different specifications. The present invention realizes rolling of flat steels with a difference of 10-30mm in diameter without sharing the pass profile at all, reduces the roll reserve and roll change time, realizes the sharing of flat steels with a difference of 20-30mm in rolls, reduces the reserve of rolls and guide devices of 2-4 rolling mills, and reduces the consumption of rolls and spare parts.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention discloses a production process for common sleeve rolling of flat steel with a specification difference of 10-30 mm, comprising:

[0008] The hole system used in the continuous rolling mill is a box hole, which is in the form of vertical, flat and vertical rolling mills alternately configured to roll flat steel with specifications differing by 10-30mm together;

[0009] The billet passes through the continuous rolling mill group and is alternately configured with horizontal and vertical rolling mills. The first specification of electrode flat steel is produced by the four-car continuous rolling mill, and then two more rolling mills are added to produce the finished product from the six-car rolling mill. The rolling specifications are 10-30mm smaller than the height and width dimensions of the four-car rolling mill.

[0010] Furthermore, when rolling flat steels of adjacent specifications, the first adjacent large-specification flat steel is produced by 2 or 4 rolling mills, and the second adjacent small-specification flat steel is produced by 4 or 6 rolling mills.

[0011] Furthermore, the first four frames for rolling 140×200mm flat steel are shared with those for rolling 160×230mm flat steel, and the finished front holes and finished holes of 140×200mm or 150×200mm flat steel are installed behind the 160×230mm finished holes; the 1-4 car rolling mills for rolling 160×230mm flat steel are installed in sequence on φ700-1V, φ700-2H, φ700-3V, and φ550-4H, and 140×200mm are installed in sequence on φ550-5V and φ700-6H, and the first four continuous rolling mills for 160×230mm flat steel and the last two 140×200mm continuous rolling mills form a six-frame continuous rolling mill group.

[0012] Furthermore, the process steps of rolling 180×220mm or 180×230mm flat steel and 200×240mm flat steel using a common frame are as follows: the first two frames of 200×240mm flat steel are shared, and the finished front hole and finished hole of 180×220mm or 180×230mm flat steel are installed behind the finished hole of 200×240mm flat steel.

[0013] Furthermore, according to the rolling sequence, vertical box-shaped hole and flat box-shaped hole are respectively adopted, and the vertical and horizontal vertical alternating arrangement is adopted. The 200×240mm flat steel 1-2 car rolling mill is installed on φ700-1V and φ700-2H in sequence, and the 180×220mm or 180×230mm flat steel 3-4 car rolling mill is installed on φ700-3V and φ550-4H.

[0014] Furthermore, for rolling 140×200mm or 150×200mm flat steel, a vertical box-shaped hole and a flat vertical box-shaped hole are arranged alternately in vertical and horizontal order respectively. The 160×230mm flat steel 1-4 car rolling mill is installed on φ700-1V, φ700-2H, φ700-3V, and φ550-4H in sequence. The 140×200mm or 150×200mm flat steel 5-6 car rolling mill is installed on φ550-5V and φ550-6H.

[0015] Furthermore, the φ500-5V hole type has a reduction of 10-30 mm / pass and a roll gap of 5-35 mm.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are:

[0017] Before the improvement, the adjacent pass profiles of rolled flat steel can only be shared within the range of 5-10mm difference in specifications, while the pass profiles with a diameter difference of 10-30mm cannot be shared. The present invention enables the sharing of flat steel with a roller difference of 10-30mm, reduces the reserve of rollers and guide devices of 2-4 rolling mills, and reduces the consumption of rollers and spare parts.

[0018] The present invention improves the production process of flat steel, can merge the pass types of flat steel of the continuous rolling mill, reduce the roll reserve and the roll changing time of specification switching, and under the premise of ensuring product quality, connect the existing pass types between similar specifications in series for rolling, produce a series of flat steel products from small to large specifications to reduce the labor intensity of workers, improve the operation rate and output, achieve the purpose of reducing costs and increasing efficiency, and have significant economic and social benefits. Therefore, the further promotion of this process will bring greater practical value and economic value to the same type of steel mills.

[0019] The present invention has been applied in Baotou Special Steel Branch and has achieved the established goals. In the future, it is planned to further promote this process to achieve common rolling of more adjacent specifications of flat steel, thereby reducing roll changes, increasing production, and improving profit margins for the enterprise, achieving the goal of reducing costs and increasing efficiency, with significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the hole type of flat steel. DETAILED DESCRIPTION

[0021] The present invention realizes sleeve rolling for flat steels with diameters differing by 10-30 mm without sharing any hole type, thereby reducing roll reserve and roll changing time, realizing sharing of flat steels with rolls differing by 20-30 mm, reducing the reserve of rolls and guide devices of 2-4 rolling mills, and reducing roll consumption and spare parts consumption.

[0022] The purpose of the present invention is achieved through the following technical solutions:

[0023] A production process for rolling flat steel with adjacent pass profiles includes:

[0024] The hole system used in the continuous rolling mill is a box hole, which is in the form of an alternating arrangement of vertical, horizontal and vertical rolling mills.

[0025] The first four rolling mills for rolling 140×200mm flat steel and 160×230mm flat steel are shared, and the finished front holes and finished holes of 140×200mm (or 150×200mm) flat steel are installed behind the 160×230mm finished holes. The first four 160×230mm flat steel rolling mills and the last two 140×200mm rolling mills form a six-stand tandem rolling mill unit. For rolling flat steel, the 160×230mm flat steel 1-4 car rolling mills are installed in sequence on φ700-1V, φ700-2H, φ700-3V, and φ550-4H; the 140×200mm flat steel is installed in sequence on φ550-5V and φ700-6H; the φ180mm flat steel 1-3 car rolling mills are installed in sequence on φ700-1V, φ700-2H, and φ700-3V; the φ160mm flat steel 6-7 car rolling mills are installed on φ550-4H and φ500-5V; the first three φ700 continuous rolling mills for φ180mm flat steel and the original last two φ500 continuous rolling mills for φ160mm flat steel form a five-frame continuous rolling mill group.

[0026] The first two frames for rolling 200×240mm and 180×220mm (or 180×230mm) flat steel are shared, and the finished front hole and finished hole of 180×220mm (or 180×230mm) flat steel are installed behind the 200×240mm finished hole. For rolling 180×220mm (or 180×230mm) flat steel, the 200×240mm 1-2 car rolling mill is installed on φ700-1V and φ700-2H in sequence, and the 180×220mm (or 180×230mm) is installed on φ700-3V and φ550-4H in sequence. The first two 200×240mm flat steel continuous rolling mills and the last two 180×220mm continuous rolling mills form a four-frame continuous rolling mill group.

[0027] The φ500-5V hole type has a reduction of 10-30mm / pass and a roll gap of 5-35mm.

[0028] Under the premise of ensuring product quality, the present invention realizes the smooth production of flat steel with similar specifications by reasonably matching the existing rollers, reduces the roller reserve and roller replacement time, and reduces the labor intensity of workers. After implementation, the flat steel with a rolling group spacing difference of 10-30mm can realize the hole type sharing, which can reduce the reserve of rollers and guide devices of 2-4 rolling mills, and reduce the consumption of rollers and spare parts. The unit price of each roller of the Φ700mm unit is 35,000 yuan, and 6 rollers save a total of 210,000 yuan; the unit price of each roller of the Φ550mm unit is 20,000 yuan, and 2 rollers save a total of 40,000 yuan; the average unit price of the guide is 30,000 yuan, and 120,000 yuan is saved by using 4 less guides. Due to the reduction of spare parts investment, the increased economic benefits = 21+4+12 = 370,000 yuan. Calculated according to 3 specifications, 37×3 = 1.11 million yuan can be saved.

[0029] Due to the sharing of hole types, the time for roll changing can be reduced by at least 15 times a year. Based on an hourly output of 80t / h, each time the continuous rolling roll is changed, it takes 2 hours, and the profit per ton of steel is 200 yuan. Therefore, the value of annual savings due to reduced roll changing times and improved work efficiency = 80×15×2×200=480,000 yuan.

[0030] Therefore, a production process of common rolling of flat steel hole types with a group spacing difference of 10-30mm created a total economic benefit of 111+48=1.59 million yuan, creating good economic benefits for the enterprise.

[0031] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A production process for common sleeve rolling of flat steel with a specification difference of 10-30mm, characterized in that: include: The hole system used in the continuous rolling mill is a box hole, which is in the form of vertical, flat and vertical rolling mills alternately configured to roll flat steel with specifications differing by 10-30mm together; The billet passes through the continuous rolling mill group and is alternately configured with horizontal and vertical rolling mills. The first specification of electrode flat steel is produced by the four-car continuous rolling mill, and then two more rolling mills are added to produce the finished product from the six-car rolling mill. The rolling specifications are 10-30mm smaller than the height and width dimensions of the four-car rolling mill.

2. The production process for common sleeve rolling of flat steel with a specification difference of 10-30mm according to claim 1 is characterized in that: For rolling flat steels of adjacent specifications, the first adjacent large-specification flat steel is produced by 2 or 4 rolling mills, and the second adjacent small-specification flat steel is produced by 4 or 6 rolling mills.

3. The production process for common sleeve rolling of flat steel with a specification difference of 10-30mm according to claim 1 is characterized in that: The first four frames for rolling 140×200mm flat steel are shared with those for 160×230mm flat steel, and the finished front holes and finished holes of 140×200mm or 150×200mm flat steel are installed behind the 160×230mm finished holes; the 1-4 car rolling mills for rolling 160×230mm flat steel are installed in sequence on φ700-1V, φ700-2H, φ700-3V, and φ550-4H, and 140×200mm are installed in sequence on φ550-5V and φ700-6H. The first four continuous rolling mills for 160×230mm flat steel and the last two 140×200mm continuous rolling mills form a six-frame continuous rolling mill group.

4. The production process for common sleeve rolling of flat steel with a specification difference of 10-30 mm according to claim 1 is characterized in that: The process steps for rolling 180×220mm or 180×230mm flat steel and 200×240mm flat steel using a shared frame are as follows: the first two frames of 200×240mm flat steel are shared, and the finished front hole and finished hole of 180×220mm or 180×230mm flat steel are installed behind the finished hole of 200×240mm flat steel.

5. The production process for common sleeve rolling of flat steel with a specification difference of 10-30 mm according to claim 4 is characterized in that: According to the rolling sequence, vertical box-shaped hole and flat box-shaped hole are used respectively, and the vertical and horizontal holes are arranged alternately. The 200×240mm flat steel 1-2 car rolling mill is installed on φ700-1V and φ700-2H in sequence, and the 180×220mm or 180×230mm flat steel 3-4 car rolling mill is installed on φ700-3V and φ550-4H.

6. The production process for common sleeve rolling of flat steel with a specification difference of 10-30 mm according to claim 4 is characterized in that: For rolling 140×200mm or 150×200mm flat steel, the vertical box-shaped hole and flat vertical box-shaped hole are arranged alternately in vertical and horizontal order according to the rolling sequence. The 1-4 car rolling mills for 160×230mm flat steel are installed on φ700-1V, φ700-2H, φ700-3V, and φ550-4H in sequence. The 5-6 car rolling mills for 140×200mm or 150×200mm flat steel are installed on φ550-5V and φ550-6H.

7. The production process for common sleeve rolling of flat steel with a specification difference of 10-30 mm according to claim 6 is characterized in that: The φ500-5V hole type has a reduction of 10-30mm / pass and a roll gap of 5-35mm.

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