A composite production process and system for common and high-quality rolled steel bars

Abstract

The present invention relates to the field of metallurgical steel rolling technology, and specifically to a composite production process and system for rolling steel bars, which is to produce ordinary bars and high-quality bars by loading steel on both sides of a cooling bed in a bar cutting production line for producing ordinary bars; wherein, when producing ordinary bars, steel is loaded on one side of the cooling bed by an input roller and a skirt plate; when producing high-quality bars, steel is loaded on the other side of the cooling bed by arranging a high-quality bar production and processing system for clamping, cutting, turning, rolling, water cooling, shearing, deceleration and braking, and rotating hub loading. The composite production process and system of the present invention effectively utilize the space position on the other side of the cooling bed, and there is no need to change the layout of the original production line too much, nor is there any need to arrange and transform equipment on the ground and underground space of the original rolling line, and can realize the composite production of ordinary bars and high-quality bars by loading steel on both sides of the cooling bed. It has the advantages of flexible process conversion, short construction period, low investment, good effect, and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical steel rolling, and in particular to a composite production process and system for rolling steel bar ordinary bars and high-strength bars. Background Art

[0002] The output of ribbed steel bars accounts for about 1 / 4 of the total steel products, and is the steel product with the largest steel consumption in my country. At present, small-sized bars (Ø25mm and below) are generally produced by the general bar process of multi-wire cutting and combined skirt plate brake cooling bed. The cutting and rolling process increases the hourly output of small-sized bars and balances the production efficiency of various specifications. However, this process has shortcomings, mainly reflected in low operating rate, large finished product line difference, low yield rate, rolling line failure and high alloy consumption, which restricts the high-quality, high-efficiency, low-consumption and low-cost production of steel bars.

[0003] With the progress and optimization of mechanical equipment, metallurgical technology and automatic control, after solving the technologies of finishing mill, segmented flying shear and cooling bed steel loading brake system and automatic control, the new technology of high-speed small-size bar (high bar) production is adopted with high-speed module finishing mill and high-speed steel loading device system. The rolling speed is increased from 18m / s to more than 40m / s, and the finish-rolled bars can be safely sent to the cooling bed at high speed.

[0004] The new standard for hot-rolled ribbed steel bars has stricter requirements on the organization, length tolerance, weight tolerance and curvature of steel. The process of strong penetration water cooling used in general bars to improve strength and reduce alloy consumption can no longer be used. It is difficult to meet the standards in dimensional accuracy, negative difference control and cooling bending by using a small-size multi-wire slitting process. Therefore, the general bar production line faces the task of upgrading and transforming with high-bar hot-machine rolling technology. However, when the existing slitting bar production line is upgraded and transformed with high-bar process technology, there are problems such as insufficient process distance, displacement of main equipment, intersection of public and auxiliary facilities, and difficulty in process conversion. The main reasons are as follows: 1. In the existing general bar production line, steel can only be loaded on one side of the cooling bed. Due to the problem of chamfering or inclined surface setting of the cooling bed conveying device (only applicable to one side of steel loading), if the process is not improved, it is impossible to produce bars from the other side. 2. Since the spatial position of the general bar production line has been finalized, if steel is loaded on the same side of the cooling bed for composite production, it is necessary to occupy the underground space of the original rolling line to lay out the upgrading and transformation equipment. This transformation method has a relatively large amount of engineering work, high cost, and is not easy to implement. Summary of the invention

[0005] In view of this, the purpose of the present invention is to propose a composite production process and system for rolled steel bars, ordinary bars and high-grade bars, so as to solve the problem that the existing ordinary bar production line cannot meet the composite production of ordinary bars and high-grade bars on both sides of the cooling bed.

[0006] Based on the above purpose, the present invention provides a composite production process for ordinary bars and high-grade steel bars of rolled steel bars. The composite production process is to produce ordinary bars and high-grade steel bars respectively by loading steel on both sides of a cooling bed in a slitting bar production line for producing ordinary bars; wherein, when producing ordinary bars, steel is loaded on one side of the cooling bed from an input roller skirt; when producing high-grade steel bars, steel is loaded on the other side of the cooling bed through a high-grade steel bar production and processing system that is equipped with clamping, head cutting, turning, rolling, water cooling, shearing, deceleration and braking, and steel loading on a rotating hub.

[0007] Preferably, when producing high-bar steel, the intermediate rolled pieces are transported through air-cooling guide grooves arranged outside the cooling bed input roller table.

[0008] Preferably, the air cooling guide groove is connected to the conveying guide groove in the slitting bar production line to form a long-distance conveying guide groove. This structural setting does not require changes to the original equipment layout, and reduces the transformation cost of the overall composite process while meeting the air cooling conveying requirements.

[0009] The pinching and conveying is performed by using a plurality of pinching and conveying rollers arranged at the output end of the air-cooling guide groove; and the head cutting is performed by using a head cutting shear or a crushing shear.

[0010] Preferably, the turning is a 180° turning by a horizontal looper. This arrangement effectively ensures the process production requirements of high-strength bars and facilitates subsequent rolling.

[0011] Preferably, the rolling is carried out by a modular rolling mill; the water cooling is carried out by a water cooling device to cool the rolled piece; the shearing is carried out by a multiple-size flying shear; the deceleration braking is carried out by a tail clamp brake; and the steel loading on the hub is carried out by a double hub steel loading device.

[0012] The method of rolling with a modular rolling mill is to roll four passes in a single-transmission modular heavy-load reducing mill. This process setting can effectively improve the performance of the rolled piece.

[0013] Preferably, the multiple-size flying shear is a disc-type high-speed multiple-size flying shear.

[0014] In the slitting bar production line for producing ordinary bars, there are 6 rough rolling mills, 6 intermediate rolling mills and 6 finishing rolling mills, which adopt conventional bar slitting technology to produce 12mm to 32mm Ф bars by multi-line or single-line slitting.

[0015] The present invention also provides a composite production system for ordinary bars and high-quality rolled steel bars, including an ordinary bar production system, which includes a cooling bed. The composite production system also includes a high-quality bar production and processing system arranged on one side of the output end of the cooling bed. The high-quality bar production and processing system includes clamping rollers, a cropping shear, a horizontal looper, an ultra-heavy modular rolling mill, a water cooling device, a multiple-length flying shear, a tail clamp brake and a double-hub steel loading device, and ordinary bars and high-quality steel bars are produced respectively by loading steel on both sides of the cooling bed.

[0016] Beneficial effects of the present invention: The composite production process and system setting of the present invention effectively utilize the space on the other side of the cooling bed, and there is no need to make too many changes to the layout of the original production line, nor is there any need to arrange and modify equipment in the underground space of the original rolling line. It can realize the composite production of ordinary bars and high-quality bars on both sides of the cooling bed. The composite production process of ordinary bars and high-quality bars of the present invention has the advantages of flexible process conversion, short construction period, low investment, good effect, and low cost. It is of practical significance to upgrade the current cutting process ordinary bar production line to high-quality bar hot machine rolling technology. It can effectively reduce costs and increase efficiency, improve the competitiveness of enterprise products, and become the development trend of hot-rolled steel bar production in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a partial layout diagram of the composite production process of ordinary rods and high rods of the present invention;

[0019] Figure 2 for Figure 1 A partial enlarged view of the middle clamp tail brake and the pinch roller;

[0020] Figure 3 for Figure 1 A partial enlarged view of the center shear, horizontal looper, modular rolling mill, and water cooling device.

[0021] The markings in the figure are:

[0022] 1. Cooling bed; 2. Skirt plate; 3. Air cooling guide trough; 4. Conveying guide trough; 5. Pinch roller; 6. Cropping shear; 7. Horizontal looper; 8. Modular rolling mill; 9. Water cooling device; 10. Multiple-length flying shear; 11. Tail clamp brake; 12. Double-hub steel loading device; 13. Lubrication station for reducing unit; 14. High-speed zone hydraulic station. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0024] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] like Figures 1 to 3 As shown, a composite production system for rolled steel bars, ordinary bars and high-quality bars, includes an ordinary bar production system using an existing slitting bar production line, the ordinary bar production system includes a cooling bed 1, and the composite production system also includes a high-quality bar production and processing system arranged on one side of the cooling bed 1, the high-quality bar production and processing system includes clamping rollers 5, a cropping shear 6, a horizontal looper 7, an ultra-heavy modular rolling mill 8, a water cooling device 9, a multiple-length flying shear 10, a tail clamp brake 11 and a double-hub steel loading device 12, and ordinary bars and high-quality bar steels are produced by loading steel on both sides of the cooling bed 1. This composite production system, by arranging pinch rollers 5, crop shears 6, horizontal loopers 7, super-heavy module rolling mills 8, water cooling devices 9, multiple-length flying shears 10, clamp tail brakes 11, double-hub steel loading devices 12 and public paving facilities on one side of the output end of the cooling bed 1 in the existing general bar production line, effectively utilizes the space position on the other side of the cooling bed 1 while retaining the original general bar process layout, and does not need to change the layout of the original production line too much, nor does it need to arrange and transform equipment on the ground and underground space of the original rolling line, and can realize the composite production of general bars and high-quality bars by loading steel on both sides of the cooling bed 1. In the high-quality bar production and processing system, a diameter reducing unit lubrication station 13 and a high-speed zone hydraulic station 14 are also provided for lubrication. Among them, the pinch rollers 5, crop shears 6, horizontal loopers 7, super-heavy module rolling mills 8, water cooling devices 9, multiple-length flying shears 10, clamp tail brakes 11, double-hub steel loading devices 12, diameter reducing unit lubrication stations 13 and high-speed zone hydraulic stations 14 can all use the corresponding equipment in the existing technology.

[0026] In order to solve the problems such as the difficulty of process conversion when the existing slitting bar production line adopts the high-bar process technology for upgrading and transformation, the present invention also provides a composite production process for rolled steel bars, ordinary bars and high-bars, which is to produce ordinary bars and high-bar steels respectively by loading steel on both sides of the cooling bed 1 in the slitting bar production line for producing ordinary bars; wherein, when producing ordinary bars, steel is loaded on one side of the cooling bed 1 by the input roller and the skirt plate 2; when producing high-bar steel, steel is loaded on the other side of the cooling bed 1 by arranging a high-bar production and processing system for clamping, cutting, turning, rolling, water cooling, shearing, deceleration and braking, and rotating hub loading. In this composite production process, the production of ordinary steel bars is still produced by the existing conventional bar slitting process, and the production of high-bar steel only requires the above-mentioned corresponding high-bar production and processing system to be arranged on the other side of the cooling bed 1, so that the process can be flexibly converted to produce high-bar steel. Among them, in the slitting bar production line for producing ordinary bars, there are 6 rough rolling mills, 6 medium rolling mills and 6 finishing rolling mills, which adopt conventional bar slitting technology to produce Ф12mm~Ф32mm bars by multi-line or single-line slitting.

[0027] As an optional implementation, when producing high-strength steel bars, the intermediate rolled pieces are transported through the air-cooling guide 3 arranged on the outside of the input roller of the cooling bed 1. The purpose is to facilitate the transportation and air cooling of the intermediate rolled pieces. This structural layout is reasonable and will not interfere with other operating procedures. Preferably, the air-cooling guide 3 is connected to the conveying guide 4 in the slitting bar production line to form a long-distance conveying guide 4. This structural setting does not require changes to the original equipment layout, and reduces the transformation cost of the overall composite process on the basis of meeting the requirements of air-cooling transportation.

[0028] As an optional implementation, in the composite production process, the pinching is performed by a plurality of pinching rollers 5 arranged in the air-cooling guide groove 3; and the head cutting is processed by a head cutting shear 6. The provision of a plurality of pinching rollers 5 can effectively ensure the pinching and conveying effect, and ensure the effective implementation of subsequent conveying and other processes.

[0029] As an optional implementation, in the composite production process, the turning is to turn 180° using the horizontal looper 7. This arrangement effectively ensures the process production requirements of high-strength bars and facilitates subsequent rolling.

[0030] As an optional implementation, in the composite production process, rolling is performed by a modular rolling mill 8; water cooling is performed by a water cooling device 9 to cool the rolled piece; shearing is performed by a multiple-length flying shear 10 to shear multiple-length; deceleration and braking is performed by a clamping tail brake 11 to decelerate; and steel loading on the hub is performed by a double hub steel loading device 12. The use of these equipment arrangements and corresponding processes can effectively ensure the organization and performance of high-strength steel bars. The multiple-length flying shear 10 is preferably a disc-type high-speed multiple-length flying shear 10.

[0031] As an optional implementation, in the composite production process, the method of rolling with the modular rolling mill 8 is to roll four passes in a single-transmission modular heavy-duty reducing mill. This process setting can effectively improve the performance of the rolled piece.

[0032] During implementation, the composite production process of the present invention is as follows: when the conventional bar cutting process is adopted, a total of 18 rolling mills are formed, including 6 roughing mills, 6 intermediate rolling mills and 6 finishing mills, and the conventional process multi-line cutting (or single line) is adopted to produce 12mm-32mm bars, and the steel is loaded on the side of the cooling bed 1 by the input roller skirt plate 2, and the other production processes remain unchanged; when the high bar process is adopted, a water cooling device 9 is provided after the finishing rolling, and the steel is divided into air cooling and temperature equalization guide grooves (the inlet side of the cooling bed 1) after the 3# flying shear, and several pinch rollers 5 are provided in the air cooling guide groove 3, and the heads are cut by the 4# shear (with the function of breaking), and the horizontal looper 7 is turned 180°, and four passes are rolled in the single transmission module heavy-duty reducing mill unit, and a water cooling device 9 is provided after rolling. Different types of steel bars adopt corresponding cooling processes to obtain ideal organization and performance. The rolled piece enters the disc-type high-speed multiple-length flying shear 10 to cut the multiple length, and then the steel is loaded on the other side of the cooling bed 1 through the rotating hub high-speed steel loading system. This composite production process setting can meet the flexible conversion between the two production methods.

[0033] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0034] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A composite production process for rolled steel bars, ordinary bars and high-strength bars, characterized in that: The composite production process is to produce ordinary bars and high-grade steel bars respectively by loading steel on both sides of a cooling bed in a split bar production line for producing ordinary bars; wherein, when producing ordinary bars, steel is loaded on one side of the cooling bed by an input roller and a skirt plate; when producing high-grade steel bars, steel is loaded on the other side of the cooling bed by a high-grade steel bar production and processing system including clamping, head cutting, turning, rolling, water cooling, shearing, deceleration and braking, and hub loading; when producing high-grade steel bars, the intermediate rolled pieces are transported by an air-cooling guide groove arranged on the outside of the input roller of the cooling bed, and the turning is a 180° turning by a horizontal loop.

2. The composite production process of rolled steel bars, ordinary bars and high-strength bars according to claim 1, characterized in that: The air cooling guide trough is connected to the conveying guide trough in the slitting bar production line to form a long-distance conveying guide trough.

3. The composite production process of rolled steel bars, ordinary bars and high-strength bars according to claim 1, characterized in that: The pinching and conveying is performed by using a plurality of pinching and conveying rollers arranged at the output end of the air-cooling guide groove; and the head cutting is performed by using a head cutting shear.

4. The composite production process of rolled steel bars, ordinary bars and high-strength bars according to claim 1, characterized in that: The rolling is carried out by a modular rolling mill; the water cooling is carried out by a water cooling device to cool the rolled piece; the shearing is carried out by a multiple-size flying shear; the deceleration braking is carried out by a tail clamp brake; and the steel loading on the hub is carried out by a double hub steel loading device.

5. The composite production process of rolled steel bars, ordinary bars and high-strength bars according to claim 4, characterized in that: The method of rolling using a modular rolling mill is to perform four passes of rolling in a single-transmission modular heavy-load reducing mill.

6. The composite production process of rolled steel bars, ordinary bars and high-strength bars according to claim 4, characterized in that: The multiple-size flying shear is a disc-type high-speed multiple-size flying shear.

7. The composite production process of rolled steel bars, ordinary bars and high-strength bars according to claim 1, characterized in that: In the slitting bar production line for producing ordinary bars, there are 6 rough rolling mills, 6 intermediate rolling mills and 6 finishing rolling mills, which use conventional bar slitting technology to produce Ф12mm~Ф32mm bars in multiple lines or single lines.

8. A composite production system using the composite production process of rolled steel bars, ordinary bars and high-strength bars, as claimed in any one of claims 1 to 7, comprising an ordinary bar production system, the ordinary bar production system comprising a cooling bed, characterized in that: The composite production system also includes a high-bar production and processing system arranged on one side of the cooling bed output end. The high-bar production and processing system includes pinch rollers, a crop shear, a horizontal looper, an ultra-heavy modular rolling mill, a water cooling device, a multiple-length flying shear, a tail clamp brake and a double-hub steel loading device. Ordinary bars and high-bar steel materials are produced by loading steel on both sides of the cooling bed.

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