CN203817045U - Production technological arrangement for screw-thread steel bar with three ribbed sides - Google Patents

Abstract

The utility model discloses a production process layout of three-side ribbed threaded steel bar, which comprises a pretreatment process, a rough rolling unit, a first shearing equipment, an intermediate rolling unit, a second shearing equipment, a finishing rolling unit, The third shearing equipment, the reducing and sizing unit, the fourth shearing equipment and the post-treatment process, the rough rolling unit, the intermediate rolling unit, the finishing rolling unit and the reducing and sizing unit all adopt three-roll mills, and the finishing rolling unit The roll surface of the last three-roll rolling mill is engraved with a crescent-shaped rib groove that matches the shape of the ribs on the surface of the three-side ribbed steel bar; the production method of the utility model is equipped with a high-strength three-roll rolling mill on the whole line, and the rolling capacity is large. It can achieve single-pass large reduction, which provides guarantee for the production of fine-grained steel bars by controlled rolling and controlled cooling; in addition, multiple temperature-controlled water tanks are installed on the entire line to carry out online temperature-controlled cooling of the rolled pieces through water, air and other media, and reasonable rolling The temperature window of the workpiece and the large reduction process of the rolling mill can realize the orderly production of high-strength grade new threaded steel bars.

Description

Production process layout of a three-sided ribbed threaded steel bar

technical field

The utility model belongs to the field of iron and steel metallurgy, and in particular relates to a process arrangement of three-side ribbed threaded steel bars.

Background technique

Adopting two-roll mill to roll out the threaded steel bar with ribs on both sides is the known technology of threaded steel rolling production.

With the progress and development of the country, large-scale infrastructure and urbanization construction cannot do without threaded steel bars for construction. In 2013, the output of threaded steel bars has exceeded 200 million tons, accounting for 20% of my country's steel production capacity. National competent authorities have also successively issued relevant policies to accelerate the elimination of 335MPa grade steel bars in construction projects, give priority to the use of 400MPa grade steel bars, and actively promote 500MPa grade steel bars.

While gradually increasing the strength level of threaded steel bars, how to fully integrate the steel bars with concrete is also a problem that technicians must consider. First, steel bars and concrete have approximately the same coefficient of thermal expansion, and at the same temperature, there is little misalignment between steel bars and concrete; second, when the concrete is hardened, the cement and the surface of the steel bars have a good bond, so that any stress can be effectively distributed between the two Usually the surface of the steel bar is also processed into rough, spaced corrugated ribs (called rebar) to further improve the bond between the concrete and the steel bar.

However, the existing threaded steel bars are ribbed on both sides when seen from the cross section, while the other two sides are not ribbed. When the building is subjected to external forces from multiple directions, the non-ribbed surface of the steel bar is not tightly bonded to the concrete, and it is easy to fall off after being stressed. In addition, the existing threaded steel bar has a low strength level, which in turn creates a safety hazard for the building.

Utility model content

In view of this, the purpose of this utility model is to provide a production process layout of three-side ribbed rebar, which can produce three-side ribbed rebar in batches, and the new rebar produced by the utility model has excellent surface quality, While the section size and strength level are greatly improved, it can effectively eliminate the safety hazard of steel and concrete falling off caused by multi-directional external forces through its own shape characteristics.

The purpose of this utility model is achieved by the following technical solutions:

A production process arrangement for three-sided ribbed threaded steel bar, including the pretreatment process, rough rolling unit, first shearing equipment, intermediate rolling unit, second shearing equipment, finishing rolling unit, and third shearing equipment arranged in sequence , reducing and sizing unit, the fourth shearing equipment and post-treatment process, the rough rolling unit, the middle rolling unit, the finishing unit and the reducing and sizing unit all adopt a three-roll rolling mill, and the last stand of the finishing rolling unit is a three-roller The roll surface of the rolling mill is engraved with a crescent-shaped rib groove that matches the shape of the rib on the surface of the ribbed steel bar on three sides;

Further, a first temperature-controlled cooling device is provided between the pretreatment process and the rough rolling unit, a second temperature-controlled cooling device is provided between the rough rolling unit and the first shearing equipment, and the intermediate rolling unit and the A third temperature-controlled cooling device is arranged between the second shearing equipment, a fourth temperature-controlled cooling device is arranged between the finishing rolling unit and the third shearing equipment, and the reducing and sizing unit and the fourth shearing equipment A fifth temperature-controlled cooling device is arranged between them;

Further, the first to fifth temperature-controlled cooling devices all use controlled-cooled water tanks;

Further, the elongation coefficient of each pass of the three-roll rolling mill is 1.0-1.6;

Further: the elongation coefficient of the last three-roll rolling mill is 1.0-1.3.

The beneficial effect of the utility model is that: the production method of the utility model is equipped with a high-strength three-roll rolling mill on the whole line, the rolling capacity is large, and single-pass large reduction can be realized, which provides for the production of fine-grained steel bars by controlled rolling and controlled cooling. In addition, multiple temperature-controlled water tanks are set up on the whole line to carry out online temperature-controlled cooling of the rolled piece through water, air and other media. The reasonable temperature window of the rolled piece and the large reduction process of the rolling mill can realize high-strength new thread Orderly production of steel bars.

Other advantages, objectives and features of the present utility model will be set forth in the following description to some extent, and to some extent, based on the investigation and research below, it will be obvious to those skilled in the art, or can be Get teaching from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings, wherein:

Figure 1 is a schematic cross-sectional view of ribbed steel bars on three sides;

Fig. 2 is a production process layout diagram of a preferred embodiment of the present invention.

Detailed ways

Preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the utility model, rather than limiting the protection scope of the utility model.

As shown in the figure, a production process layout of three-sided ribbed threaded steel bars includes pretreatment process 1, rough rolling unit 3, first shearing equipment 5, intermediate rolling unit 6, and second shearing equipment 8 arranged in sequence , finishing rolling unit 9, the third shearing equipment 11, reducing sizing unit 12, the 4th shearing equipment 14 and aftertreatment process 15, described rough rolling unit, middle rolling unit, finish rolling unit and reducing sizing unit all A high-strength three-roll rolling mill is adopted, and the roll surface of the last three-roll rolling mill of the finishing rolling unit is engraved with a crescent-shaped rib groove that matches the shape of the rib on the surface of the three-side ribbed steel bar.

In this embodiment, the pre-treatment process includes continuous casting billet - billet length - billet off-line stacking into storage - billet reheating - heating furnace heating billet out of the furnace - high-pressure water descaling; post-treatment process includes cooling bed cooling - cooling Cutting (sawing) cutting equipment to cut to length - inspection and collection of finished bars - bundling off the assembly line - storage and stacking.

In this embodiment, in order to ensure the dimensional accuracy and circular cross-section accuracy of the rolled piece, the rolls of adjacent rolling mills are respectively arranged in a regular triangle and an inverted regular triangle.

In this embodiment, a first temperature-controlled cooling device 2 is provided between the pretreatment process and the rough rolling group, and a second temperature-controlled cooling device 4 is provided between the rough rolling group and the first shearing equipment. A third temperature-controlled cooling device 7 is arranged between the middle rolling group and the second shearing equipment, and a fourth temperature-controlled cooling device 10 is arranged between the finishing rolling group and the third shearing equipment. A fifth temperature-controlled cooling device 13 is arranged between the unit and the fourth shearing device; the first to fifth temperature-controlled cooling devices all use controlled cooling water tanks; the elongation coefficient of each pass of the three-roll rolling mill is 1.0- 1.6; In order to ensure the dimensional accuracy of the final product, the elongation coefficient of the last three-roll rolling mill is 1.0-1.3.

The ribs on the three sides of the rebar produced in this embodiment are evenly distributed around the outer surface of the steel bar at 120° in the circumferential direction. Compared with the products produced by the traditional two-roll rolling mill, the rolling speed is faster, the production capacity is higher, and the cross-sectional dimension accuracy is higher. Higher, more uniform performance, higher strength grade, which can be increased by more than 50mPa; higher degree of adhesion to concrete, compared with traditional two-side ribbed threaded steel bars, the bonding strength is increased by more than 30%, and when the steel bar is subjected to multi-directional external forces Compared with the misalignment of concrete, traditional steel bars are smaller, making buildings safer. From the perspective of rolling and forming, the three-roll finishing mill deforms the ribbed threaded steel bar and forms the final crescent-shaped steel rib. The three rolls simultaneously roll and deform the section of the rolled piece in three directions, and the forming effect is better. It has stronger deformation ability and higher dimensional accuracy, and is also suitable for producing fine-grain threaded steel bars from the perspective of controlled rolling and controlled cooling process.

The production method of this embodiment can not only produce the new three-side ribbed threaded steel bar in the utility model, but also can be used to produce high-quality round steel. Equally, this production method is also applicable to the production of high-speed wire rod ribbed steel bars and circular wire rods with similar cross-sections.

The production features of this embodiment are: (1) The whole line is equipped with a high-strength three-roll mill, which has a large rolling capacity and can realize single-pass large reduction, providing guarantee for the production of fine-grained steel bars by controlled rolling and controlled cooling; (2) The whole line Set up multiple temperature-controlled water tanks, and conduct online temperature-controlled cooling of the rolled pieces through water, air and other media. The reasonable temperature window of the rolled piece and the large reduction process of the rolling mill realize the orderly production of high-strength grade new threaded steel bars; ( 3) The production process and layout of the whole line are flexible, and the rolling mill unit can be appropriately increased or decreased according to the actual process needs, so as to optimize the production investment cost and maximize the production benefit.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the spirit and scope of the technical solutions shall be covered by the claims of the present utility model.

Claims (5)

1. A production process arrangement for three-side ribbed threaded steel bars, including a pretreatment process, a rough rolling unit, a first shearing device, an intermediate rolling unit, a second shearing device, a finishing rolling unit, and a third shearing unit arranged in sequence Cutting equipment, reducing and sizing unit, the fourth shearing equipment and post-treatment process, it is characterized in that: described rough rolling unit, intermediate rolling unit, finish rolling unit and reducing and sizing unit all adopt three-roll rolling mill, and described finishing rolling The roll surface of the last three-roll rolling mill of the unit is engraved with a crescent-shaped rib groove that matches the shape of the rib on the surface of the ribbed steel bar on three sides. 2. The production process layout of the three-side ribbed threaded steel bar according to claim 1, characterized in that: a first temperature-controlled cooling device is arranged between the pretreatment process and the rough rolling unit, and the rough rolling unit and the rough rolling unit A second temperature-controlled cooling device is arranged between the first shearing equipment, a third temperature-controlled cooling device is arranged between the middle rolling group and the second shearing device, and a third temperature-controlled cooling device is arranged between the finishing rolling group and the third shearing device. A fourth temperature-controlled cooling device is arranged between them, and a fifth temperature-controlled cooling device is arranged between the reducing and sizing unit and the fourth shearing device. 3. The production process layout of the three-side ribbed threaded steel bar according to claim 2, characterized in that: the first to fifth temperature-controlled cooling devices all use controlled cooling water tanks. 4. The production process layout of three-side ribbed rebar according to claim 1, characterized in that: the elongation coefficient of each pass of the three-roll rolling mill is 1.0-1.6. 5. The production process arrangement of three-side ribbed rebar according to claim 1, characterized in that: the elongation coefficient of the last three-roll rolling mill is 1.0-1.3.