CN219357381U - Cogging continuous rolling production line of blank - Google Patents

Abstract

The utility model provides a cogging and continuous rolling production line of a billet, and belongs to the technical field of rolling processing of wire and bar materials. The rolling mill comprises at least two rolling units, wherein the rolling units are sequentially arranged along the rolling direction of a billet, at least two rolling mills are arranged in the rolling units, the deformation directions of rolling mills in the rolling units are the same, and the deformation directions of rolling mills in the adjacent two rolling units are intersected. According to the utility model, two rolling mills in the same rolling mill set can roll the blank at least twice in the same deformation direction, so that the deformation of the blank in the deformation direction can be increased, the deformation permeation effect of the blank core is increased, the internal defects of the original as-cast structure in the blank core are improved, and the product quality of the rolled blank is improved.

Description

Cogging continuous rolling production line of blank

Technical Field

The utility model relates to the technical field of rolling processing of wire and bar materials, in particular to a cogging and continuous rolling production line of a billet material.

Background

In the field of hot rolling of steel, a cogging rolling process of a long material has been changed from the past for the purpose of solving a billet shape for a rod and wire material to the purpose of improving the quality of a rod and wire material product. The large-section steel billet can be deformed and pressed for multiple times by adopting a cogging rolling process with increased rolling reduction, so that the internal defects of the original cast structure in the steel billet are reduced to a large extent, and the problems of carbon segregation and the like of the steel billet can be obviously improved. In particular to high-quality rod wire products with high requirements on product performance, such as high-grade cold heading steel, high-grade gear steel, high-grade spring steel, high-standard bearing steel, high-strength cord steel, cutting wires, piano steel wires and the like, which are used in the industries of automobiles, machinery and the like, and are generally produced by adopting a two-fire forming process. The steps of the two-shot process are typically as follows: and (3) heating the large-section billet, rolling the heated billet into a rolled billet with a smaller section by a cogging production line, cooling, collecting, performing flaw detection, grinding according to the requirement, and then sending the rolled billet into a rod wire heating furnace for reheating and rolling a finished rod wire.

At present, the long material cogging rolling production line mainly comprises the following three types: firstly, rolling by adopting a single-frame or multi-frame reciprocating reversible rolling mill, and also simply reversing cogging; the second is rolling by adopting a single-frame or multi-frame reciprocating reversible rolling mill and a plurality of subsequent continuous rolling units which are arranged in a flat-vertical or vertical-flat alternating manner, and is also called semi-continuous rolling cogging for short; and thirdly, rolling by adopting a plurality of continuous rolling mills which are arranged horizontally-vertically or vertically-horizontally alternately, and also called continuous rolling cogging. The reversible cogging mode has good deformation and permeation effects, but the roller and the front roller way and the rear roller way are required to be frequently and positively switched, besides the steel to be moved to the middle hole groove in the pass clearance time, the rolling mill pressing mechanism is required to be rapidly adjusted to adapt to the roll gap required by the next pass, the temperature reduction in the rolling process is avoided to be too fast, the single-pass pure rolling time is generally controlled within 10s, the stable rolling speed of each pass is generally controlled within 2m/s to 5m/s, although the steel biting of each pass is carried out at a lower speed, the impact of the steel biting and throwing frequently on a mechanical transmission system, electric transmission, an upper power grid and the like of the rolling mill is larger, meanwhile, the rolling mill pressing precision is limited, and the size precision of the rolled piece is low. In addition, the yield of single-stand reversible cogging is low, for example, for the production of 150mm×150mm rolled billets, 280mm×320mm billets are used, and the annual yield of single-stand reversible cogging is basically 60 to 80 ten thousand t. In order to obtain higher yield and maintain the technological advantages of large deformation and permeation of reversible cogging rolling, two or even more reversible cogging rolling mills are needed, or a second semi-continuous rolling production line cogging mode is needed, but the two modes are all needed to be provided with a single or multiple reciprocating reversible rolling mill, the production line is longer, the temperature of the production process is reduced greatly, the investment on plants, civil engineering, equipment and the like is higher, and the input and output economy is low. Moreover, it is difficult to achieve high precision rolling of billets by means of two or even more reversible cogging mills. The third mode is full continuous rolling cogging, namely rolling billets into finished rolling billets continuously at one time along the rolling direction, and the method has the advantages of high finished product size precision, high rolling efficiency, high annual output and the like. However, in the existing full continuous rolling cogging production line, a rolling mill generally adopts a full continuous rolling mode of horizontal-vertical or vertical-horizontal alternating arrangement, and in the rolling mill process, one pass of alternate deformation is sequentially and alternately rolled in each direction of the height and width of a billet, compared with a rolling billet obtained by a reversible cogging production line, the core deformation penetration effect is poor, and the internal quality of the rolling billet obtained by the existing full continuous rolling cogging production line is lower than that of the rolling billet obtained by the reversible cogging, so that the application of the full continuous rolling cogging production line is restricted.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a cogging and continuous rolling production line for solving the problems of poor deformation and permeation effects of a wire core portion of a continuous rolling cogging production line in the prior art.

To achieve the above and other related objects, the present utility model provides a continuous cogging and rolling line for a billet, which includes at least two rolling mill sets, the rolling mill sets are sequentially arranged along a rolling direction of the billet, at least two rolling mills are provided in the rolling mill sets, deformation directions of rolling mills in the rolling mill sets are the same, and deformation directions of rolling mills in adjacent rolling mill sets intersect.

Optionally, the included angle between the deformation directions of the rolling mills in two adjacent rolling mill sets is 85-95 degrees.

Optionally, the deformation directions of the rolling mills in adjacent rolling mill groups are vertical.

Optionally, in the adjacent rolling mill sets, the deformation direction of the rolling mill in one rolling mill set is set along the vertical direction, and the deformation direction of the rolling mill in the other rolling mill set is set along the horizontal direction.

Optionally, in the adjacent rolling units, the rolling mill in one rolling unit is a vertical rolling mill, and the rolling mill in the other rolling unit is a flat rolling mill.

Optionally, the rolling mill further comprises a tail rolling mill, wherein the tail rolling mill is arranged behind all rolling mill groups in the rolling direction of the blank, and the deformation direction of the tail rolling mill is intersected with the deformation direction of the rolling mill in the adjacent rolling mill groups.

Optionally, the deformation direction of the tail rolling mill is perpendicular to the deformation direction of the rolling mill in the adjacent rolling mill group.

Optionally, the pass of the rolling mill is box-shaped.

Optionally, the elongation coefficient of the rolling mill is 1.05-1.5.

Optionally, each rolling mill is provided with an independent power unit.

Optionally, the rolling mill further comprises a shearing machine, a slow cooling rack and a cooling bed which are sequentially arranged, and the blank material sequentially passes through the shearing machine, the slow cooling rack and the cooling bed after passing through each rolling mill.

As described above, the cogging and continuous rolling production line of the blank has the following beneficial effects: because at least two rolling mills are arranged in the rolling mill group, when the blank passes through the rolling mill group, the two rolling mills can roll the blank at least twice in the same deformation direction, so that the deformation of the blank in the deformation direction can be increased, the deformation permeation effect of the blank core is increased, the improvement of the internal defects of the original as-cast structure in the blank core is facilitated, and the product quality of the rolled blank is improved.

Drawings

Fig. 1 is a layout schematic diagram of a continuous cogging line in an embodiment of the present utility model.

Fig. 2 is a schematic layout view of a rolling mill train according to an embodiment of the present utility model.

Fig. 3 is a schematic diagram showing deformation of each pass in the rolling process of the blank according to the embodiment of the utility model.

Reference numerals illustrate: a vertical rolling mill unit 1, a flat rolling mill unit 2, a tail rolling mill 3, a continuous rolling mill unit 10, a traversing rack 2, a shearing machine 30, a slow cooling rack 40 and a cooling bed 50.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

Please refer to fig. 1 to 3. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Referring to fig. 1 to 3, the present embodiment provides a bloom continuous rolling line, and arrows in fig. 1 and 3 indicate rolling directions of the bloom continuous rolling line, that is, moving directions of the bloom in the bloom continuous rolling line. The cogging continuous rolling production line comprises at least two rolling units, wherein the rolling units are sequentially arranged along the rolling direction of the billets, at least two rolling machines are arranged in the rolling units, the deformation directions of the rolling machines in the same rolling unit are the same, and the deformation directions of the rolling machines in adjacent rolling units are intersected.

In this embodiment, the rolling mill train sets gradually along the rolling direction of base material, can realize continuous rolling cogging to the base material, promotes rolling efficiency. Meanwhile, as at least two rolling mills are arranged in one rolling mill set, when the blank passes through the rolling mill set, the two rolling mills can roll the blank at least twice in the same deformation direction, so that the deformation of the blank in the deformation direction is increased, compared with the process of rolling the blank in the same deformation direction only once, the deformation and permeation effect on the core of the blank in the rolling process is increased, the internal defect of the original as-cast structure in the core of the blank is favorably improved, and the product quality of the rolled blank is improved. The deformation directions of rolling mills in adjacent rolling mill groups are intersected. Therefore, the deformation direction of the rolling mill of the next rolling mill group is different from that of the rolling mill of the previous rolling mill group in the rolling direction, so as to prevent the blank from being excessively rolled in the same deformation direction.

In this embodiment, in two adjacent rolling mill sets, the included angle between the deformation directions of the rolling mill sets is 85 ° to 95 °. Specifically, in this embodiment, the deformation directions of the rolling mills in the adjacent rolling mill sets may be perpendicular, that is, the included angle between the deformation directions of the rolling mills in the adjacent two rolling mill sets is 90 °. In practical situations, the deformation directions of the rolling mills in two adjacent rolling mill groups are difficult to be absolutely vertical, so that in the practical situations, the included angle between the deformation directions of the rolling mills in the two adjacent rolling mill groups is 89-91 degrees. In this embodiment, the blank is a square blank or a rectangular blank, that is, the cross-sectional shape of the blank is square or rectangular. The deformation directions of rolling mills in adjacent rolling units are vertical, and the rolling mill can be matched with square blanks or rectangular blanks to roll the blanks, so that the blanks are prevented from being twisted.

In this embodiment, in two adjacent rolling mill groups, the deformation direction of the rolling mill in one rolling mill group is set in the vertical direction, and the deformation direction of the rolling mill in the other rolling mill group is set in the horizontal direction.

In this embodiment, the continuous cogging line further includes a tail rolling mill 3, and in the rolling direction of the billet, the tail rolling mill 3 is disposed after all the rolling mill groups, and the deformation direction of the tail rolling mill 3 intersects with the deformation direction of the rolling mill in the adjacent rolling mill group. In this embodiment, the rolling train adjacent to the tail rolling mill 3, i.e. the rolling train preceding the tail rolling mill 3. The angle between the deformation direction of the tail mill 3 and the deformation direction of the mill in the adjacent mill train may be 85 deg. -95 deg.. Specifically, in this embodiment, the deformation direction of the tail rolling mill 3 may be perpendicular to the deformation direction of the rolling mill in the adjacent rolling mill group, that is, the included angle between the deformation direction of the tail rolling mill 3 and the deformation direction of the rolling mill in the adjacent rolling mill group is 90 °. In actual conditions, the deformation direction of the tail rolling mill 3 is difficult to be absolutely perpendicular to the deformation direction of the rolling mill in the adjacent rolling mill group, so that the included angle between the deformation direction of the tail rolling mill 3 and the deformation direction of the rolling mill in the adjacent rolling mill group is 89-91 degrees in actual conditions

In this embodiment, one of the two adjacent rolling trains is a vertical rolling train 1, i.e., the rolling mill therein is a vertical rolling mill, and the other rolling train is a flat rolling train 2, i.e., the rolling mill therein is a flat rolling mill. Specifically, in this embodiment, the continuous cogging production line includes two vertical rolling units 1, two flat rolling units 2 and 1 tail rolling mill 3, 9 rolling mills are sequentially and alternately arranged in the vertical rolling unit 1 and the flat rolling unit 2 in the rolling direction of the billet, specifically, the 9 rolling mills are sequentially vertical rolling mill, flat rolling mill, vertical rolling mill, flat rolling mill and vertical rolling mill in the rolling direction of the billet.

In some embodiments, the rolling mill bore may be circular, semi-circular, or rhombus. In the embodiment, the pass of the rolling mill is box-shaped, the box-shaped pass can better prevent blanks from twisting in the rolling process, the box-shaped pass is simple in structure, high in strength and long in service life, and the rolling mill is suitable for cogging.

Specifically, the elongation coefficient of the rolling mill may be 1.05 to 1.5, that is, the elongation coefficient of a single rolling pass is 1.05 to 1.5. The elongation coefficient is too high, the rolling of the blank is excessive, and the next pass process is easy to twist. Meanwhile, the requirements on the rolling mill are correspondingly improved, and the production line cost is increased. Too low an elongation coefficient makes it difficult to produce a deformation penetration effect on the core of the blank. In this embodiment, the elongation coefficient is 1.25.

The rolling mill is respectively provided with an independent power unit, and the power units of the rolling mill independently operate, so that mutual interference among the power units of the rolling mill is avoided, and the rolling effect is influenced. In the embodiment, the power unit is a motor, and the motor is stable in operation and large in torque and is suitable for cogging.

In this embodiment, the continuous cogging line further includes a shearing machine 30, a slow cooling rack 40 and a cooling bed 50 which are sequentially arranged, and the billet passes through the shearing machine 30, the slow cooling rack 40 and the cooling bed 50 after passing through each rolling mill. The hot billet is rolled by a rolling mill set and then transversely moved, sheared to a certain extent and sheared to a tail. Then collecting the rolled blank through a slow cooling bench 40 or cooling the rolled blank through a cooling bed 50 to obtain a finished rolled blank. The hot steel billet is rolled by a single piece in a cogging continuous rolling production line, and the shearing procedure after transverse movement is also single piece production.

When the blank is actually rolled, the blank is a round, square or rectangular hot steel billet, and the cross section area of the steel billet is 40000mm ² ～360000mm ² . When the blank is square or rectangular hot steel blank, the side length of the cross section of the steel blank is 200-600 mm.

Correspondingly, the finished rolled blank, such as square blank or rectangular blank, after being rolled by the cogging continuous rolling production line has the cross section area of 6400mm ² ～90000mm ² . In the embodiment, when the hot billet is rolled in a continuous cogging production line, the rolling temperature is 700-1250 ℃, and the rolling speed is 0.05-10 m/s.

Specifically, for example, a rectangular hot billet having a cross-sectional dimension of 300mm×400mm is used, and a single rolling is performed by each rolling mill group to obtain a rolled billet having a cross-sectional dimension of 150mm×150 mm. The rolling blank is transversely moved by a transverse moving rack and conveyed to a shearing machine by a roller way, and the rolling blank is cut to a fixed length by the shearing machine, and the rolling blank is cut to a fixed length by shearing head, fixed length and tail. The fixed-length rolling blanks can be conveyed to a slow cooling rack through a roller way, collected at the tail end of the slow cooling rack, and then lifted to a slow cooling facility for slow cooling through a crane. The fixed-length rolling blank can be conveyed to a cooling bed through a roller way and is cooled by the cooling bed while stepping forward. And after the fixed-length rolling billets are collected at the tail end of the cooling bed, lifting the rolling billets to a stacking place by a crane to obtain finished rolling billets.

In summary, in the cogging and continuous rolling production line of the billet according to the embodiment, since at least two rolling mills are disposed in a rolling mill set, when the billet passes through the rolling mill set, the two rolling mills can roll the billet at least twice in the same deformation direction, so as to increase the deformation of the billet in the deformation direction, increase the deformation and permeation effects of the core of the billet, be beneficial to improving the internal defects of the original as-cast structure in the core of the billet, and improve the product quality of the rolled billet.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. The utility model provides a cogging continuous rolling production line of base material which characterized in that: the rolling mill comprises at least two rolling units, wherein the rolling units are arranged along the rolling direction of a blank, at least two rolling mills are arranged in the rolling units, the deformation directions of rolling mills in the rolling units are the same, and the deformation directions of rolling mills in the adjacent two rolling mill units are intersected.

2. The bloom continuous rolling line of the bloom material as claimed in claim 1, characterized in that: the included angle between the deformation directions of rolling mills in two adjacent rolling mill sets is 85-95 degrees.

3. The bloom continuous rolling line of the bloom material as claimed in claim 1, characterized in that: the deformation directions of rolling mills in two adjacent rolling mill groups are vertical.

4. A bloom continuous rolling line for bloom materials as in claim 3, wherein: in two adjacent rolling mill sets, the deformation direction of rolling mill in one rolling mill set is along vertical direction, and the deformation direction of rolling mill in another rolling mill set is along horizontal direction.

5. The continuous bloom rolling line for bloom material according to any one of claims 1 to 4, characterized in that: the rolling mill further comprises a tail rolling mill, wherein the tail rolling mill is arranged behind all rolling mill groups in the rolling direction of the blank, and the deformation direction of the tail rolling mill is intersected with the deformation direction of the rolling mill in the adjacent rolling mill groups.

6. The continuous cogging line for a billet according to claim 5, wherein: the deformation direction of the tail rolling mill is perpendicular to the deformation direction of the rolling mill in the adjacent rolling mill group.

7. The continuous bloom rolling line as claimed in any one of claims 1 to 4 or 6, characterized in that: the pass of the rolling mill is box-shaped.

8. The blooming continuous rolling line of a billet according to any one of claims 1 to 4 or 6, characterized in that: the elongation coefficient of the rolling mill is 1.05-1.5.

9. The blooming continuous rolling line of a billet according to any one of claims 1 to 4 or 6, characterized in that: each rolling mill is respectively provided with an independent power unit.

10. The blooming continuous rolling line of a billet according to any one of claims 1 to 4 or 6, characterized in that: the rolling mill is characterized by further comprising a shearing machine, a slow cooling rack and a cooling bed which are sequentially arranged, and the blank sequentially passes through the shearing machine, the slow cooling rack and the cooling bed after passing through each rolling mill.