CN215696780U - Connecting device for hot-rolled strip steel endless rolling intermediate billet - Google Patents
Connecting device for hot-rolled strip steel endless rolling intermediate billet Download PDFInfo
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- CN215696780U CN215696780U CN202121610773.3U CN202121610773U CN215696780U CN 215696780 U CN215696780 U CN 215696780U CN 202121610773 U CN202121610773 U CN 202121610773U CN 215696780 U CN215696780 U CN 215696780U
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Abstract
The utility model belongs to the technical field of hot-rolled strip steel, and relates to a connecting device for a hot-rolled strip steel headless rolling intermediate billet, which comprises a shearing machine and a composite rolling connecting mechanism which are sequentially arranged between a roughing mill and a finishing mill; the composite rolling connection mechanism comprises a lifting device, a powder spreading device and a rolling device, wherein the lifting device is used for overlapping two adjacent intermediate blanks, the powder spreading device is used for heating and spreading iron powder, and the rolling device is used for rolling the joint of the intermediate blanks. Processing both ends of the intermediate blank after rough rolling into tenon-and-mortise structures by a shearing machine; adopting a lifting device to lap joint two adjacent intermediate blanks through a mortise and tenon structure; heating the iron powder by adopting a powder paving device and paving the heated iron powder at the mortise-tenon joint; the connecting parts fully paved with the iron powder are connected by rolling through a rolling machine. The utility model has simple equipment, low cost and small occupied area, and is suitable for the reconstruction of the existing production line.
Description
Technical Field
The utility model belongs to the technical field of hot-rolled strip steel, and relates to a connecting device for a hot-rolled strip steel endless rolling intermediate billet.
Background
The hot rolled strip endless rolling technology is one of the most advanced technologies in the world steel production at present, and can connect a plurality of rough rolled intermediate blanks, continuously enter a finishing mill group, be continuously and stably rolled by the finishing mill group, be stably cooled and subjected to phase change control by a laminar cooling line, and finally be sheared by flying shears and coiled into a plurality of hot rolled strip steel coils by a coiling machine. Compared with the conventional rolling, the endless rolling can obviously improve the production efficiency and the yield, improve the threading performance, reduce the roller consumption of the roller and realize the stable production of new products such as ultra-thin strips and the like.
The existing conventional hot continuous rolling production is changed into endless rolling production, and the most key technical problem is the connection problem of the intermediate blank after rough rolling. Because the endless rolling adopts a belt tension rolling mode, and the second flow of the intermediate billet and the finish rolling mill is kept equal, the connection speed and the quality of the intermediate billet in a hot state influence whether the endless rolling can be realized, if the connection speed is too slow and the connection time is too long, the production efficiency is influenced, and obvious temperature drop is generated, so that the subsequent finish rolling is difficult to carry out; if the connection strength is not high and the quality is not good, the strip breakage is easy to occur at the connection part, so that the continuous finish rolling can not be carried out; more importantly, as the conventional hot rolling endless rolling is mainly oriented to the reconstruction of the existing hot continuous rolling production line, and the production line space is fixed, the connecting equipment is not suitable to be large and complex, otherwise, the installation position of the equipment is limited, and the investment and production maintenance cost are increased.
At present, the endless rolling intermediate billet connection method realizes an induction heating connection method, a laser heating connection method and a shearing and pressing connection method which are industrially applied. The welding can be completed only by moving at least 20m by a huge induction heating mechanism of an induction heating connection method, and the existing hot continuous rolling production line has fixed space, needs to meet the walking space of 20m of connection equipment and is not easy to realize. The laser heat welding method also requires the connecting device to move during the connecting process, and thus there is a problem in that the moving space of the connecting device is limited. And the power required by the laser is very large, thus obviously increasing the equipment investment and the production cost. The shearing and crimping method adopts a specially designed shearing machine to shear the lapping area of the intermediate billet along the inclined plane, and applies pressure to the inclined plane while shearing so as to form physical combination along the shearing plane. Because the extremely large pressure required by physical connection needs to be met, the equipment is large in size, the length of the equipment is about 17m, the occupied space is large, and the equipment investment and maintenance cost is high.
The main problems of the existing intermediate billet connection mode are that the equipment investment is large, the maintenance cost is high, the occupied area of the equipment is large or the space of a connection mechanism needing to walk is large, and the existing production line transformation with fixed space is undoubtedly the biggest obstacle.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a connecting device for endless rolling of an intermediate billet of a hot rolled strip steel, which solves the problems of complexity and poor connection reliability of the existing intermediate billet connecting equipment.
In order to achieve the purpose, the utility model provides the following technical scheme:
a connecting device for hot-rolled strip steel headless rolling intermediate billets comprises a shearing machine and a composite rolling connecting mechanism which are sequentially arranged between a roughing mill and a finishing mill; the composite rolling connection mechanism comprises a lifting device, a powder paving device and a rolling device, wherein the lifting device is used for overlapping two adjacent intermediate blanks, the powder paving device is used for paving iron powder, and the rolling device is used for rolling the joint of the intermediate blanks.
According to the basic scheme, the shearing machine, the lifting device, the powder spreading device and the rolling device are arranged between the roughing mill and the finishing mill, so that the equipment is simple, the cost is low, the occupied area is small, and the method is suitable for the transformation of the existing production line; the powder rolling metallurgical bonding and the tenon-and-mortise mechanical connection combined action are adopted, the metallurgical bonding between powder particles and between powder and an intermediate blank is realized by high-temperature powder rolling, and the connection reliability is improved.
Further, a shearing tool for processing the end part of the intermediate blank into a mortise and tenon structure is arranged on the shearing machine; and the shearing cutter is provided with an extrusion surface for processing the surface of the intermediate blank into a saw-toothed shape.
Furthermore, a heating device for heating the iron powder is arranged on the powder spreading device.
Further, the liquid phase volume fraction of the iron powder is 45-65%; the mass percentage of carbon element in the iron powder is less than or equal to 1.0 percent, and the iron powder is graded in different particle sizes according to proportion.
Furthermore, the rolling device is provided with a roller heating system, and the roller can be heated to 500-900 ℃.
Further, the powder spreading thickness of the iron powder is 1.5-2 times of the thickness of the iron powder after rolling.
Further, the thickness of the intermediate blank after rough rolling is 25-35 mm, and the temperature is 980-1100 ℃.
The utility model has the beneficial effects that:
1. the connecting device is simple in equipment, the end part of the intermediate billet is processed through the shearing machine, the connection is realized through the composite rolling connecting mechanism with the lifting device and the powder spreading device, the occupied area of the equipment is small, and the maintenance cost is low.
2. According to the utility model, the powder rolling metallurgical bonding and the mortise and tenon mechanical connection are adopted for combined action, and the metallurgical bonding among powder particles and between powder and an intermediate blank is realized by high-temperature powder rolling; the mortise and tenon connection not only increases the combined action surface, but also improves the connection reliability.
3. The iron powder can be made from production waste, so that the recycling of waste steel is realized; the powder rolling realizes most metallurgical bonding among powder particles, and promotes the processes of fusion, recrystallization and growth of crystal grains through self high temperature in the process that the intermediate blank advances to a finishing mill, so that the connection is firmer.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the utility model, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view showing the arrangement of a connecting apparatus for endless rolling of an intermediate slab of a hot rolled strip steel in the present invention;
FIG. 2 is a schematic view of the composite roll bonding mechanism of the present invention;
FIG. 3 is a schematic view of the mortise-tenon joint of the intermediate billet in the present invention;
FIG. 4 is a schematic view of the surface shape of the mortise-tenon joint of the intermediate billet in the present invention;
reference numerals: 1-a roughing mill; 2-shearing machine; 3-a lifting device; 4-a powder spreading device; 5-a rolling device; 6-finishing mill; 7-the next intermediate slab; 8-a previous intermediate slab; 9-iron powder.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the utility model only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the utility model thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Example 1
Referring to fig. 1 to 4, a connecting device for hot rolled strip endless rolling of an intermediate slab includes a shearing machine 2 and a composite rolling connecting mechanism sequentially installed between a roughing mill 1 and a finishing mill 6; the shearing machine 2 is provided with a shearing tool for processing the end parts of the next intermediate blank 7 and the previous intermediate blank 8 into tenon-and-mortise structures; the composite rolling connection mechanism comprises a lifting device 3, a powder laying device 4 and a rolling device 5, wherein the lifting device 3 is used for overlapping a next intermediate blank 7 and a previous intermediate blank 8 which are adjacent to each other, the powder laying device 4 is used for heating and laying iron powder 9, and the rolling device 5 is used for performing powder rolling on the joint of the next intermediate blank 7 and the previous intermediate blank 8.
The thickness of the intermediate blank after rough rolling is 25mm, the temperature is 980 ℃, the adjacent ends of the next intermediate blank 7 and the previous intermediate blank 8 are respectively cut into matched wedge-shaped mortise and tenon structures by a shearing machine 2, and the surfaces of the next intermediate blank 7 and the previous intermediate blank 8 to be paved with the iron powder 9 are processed into saw-toothed shapes.
Paving iron powder 9 at the mortise-tenon joint by using a powder paving device 4, controlling the liquid phase volume fraction of the heated iron powder 9 at 45-65% by using the powder paving device 4, and paving the iron powder 9 on a sawtooth surface at the mechanical joint of the next intermediate blank 7 and the previous intermediate blank 8; the mass percent of carbon element in the iron powder 9 is 0.8 percent; the diameter of fine particle size iron powder in the iron powder 9 is 75 μm, and the volume fraction in a solid state is 95%; the diameter of the coarse-grain-size iron powder in the iron powder 9 is 300 mu m, and the volume fraction is 5 percent in a solid state; the powder spreading thickness of the iron powder 9 is 1.5 times of the thickness after rolling.
Rolling the mortise-tenon joint by using a rolling device 5, and heating a roller to 800 ℃ by using a self-provided heating system; at the moment, the temperature of the intermediate billet is 950 ℃, the powder rolling part is sintered by utilizing the self temperature of the intermediate billet, and the physical gaps among rolling powder and between the rolling powder and the intermediate billet are reduced; the rolled intermediate slab is transferred to a finish rolling mill 6 to be finish rolled.
Example 2
This example differs from example 1 in that: the thickness of the intermediate blank after rough rolling is 30mm, the temperature is 1050 ℃, and the rolling temperature of a roller is controlled to be 750 ℃ by a rolling device 5; the mass percent of carbon element in the iron powder 9 is 0.58 percent; the diameter of fine particle size iron powder in the iron powder 9 is 55 μm, and the volume fraction in a solid state is 85%; the diameter of the coarse-grain-size iron powder in the iron powder 9 is 230 mu m, and the volume fraction is 15% in a solid state; the powder spreading thickness of the iron powder 9 is 2 times of the thickness after rolling.
Example 3
This example differs from example 1 in that: the thickness of the intermediate blank after rough rolling is 35mm, the temperature is 1100 ℃, and the roller temperature of the roller is controlled to be 650 ℃ by the rolling device 5; the mass percentage of carbon element in the iron powder 9 is 0.28 percent. In the iron powder 9, the diameter of fine particle size iron powder is 25 μm, and the solid state volume fraction is 70%; the coarse-grained iron powder had a diameter of 170 μm and a solid volume fraction of 30%. The powder spreading thickness of the iron powder 9 is 2 times of the thickness after rolling.
Example 4
This example differs from example 1 in that: the thickness of the intermediate blank after rough rolling is 35mm, the temperature is 1100 ℃, and the roller temperature of the roller is controlled to be 550 ℃ by the rolling device 5; the mass percent of carbon element in the iron powder 9 is 0.01 percent. In the iron powder 9, the diameter of fine particle size iron powder is 25 μm, and the solid state volume fraction is 70%; the coarse-grained iron powder had a diameter of 170 μm and a solid volume fraction of 30%. The powder spreading thickness of the iron powder 9 is 2 times of the thickness after rolling.
Example 5
This example differs from example 4 in that: the iron powder 9 contains iron powder with three particle sizes, the diameter of the iron powder with the fine particle size is 20 mu m, and the volume fraction is 60 percent in a solid state; the diameter of the medium-particle-size iron powder is 100 mu m, and the volume fraction of the medium-particle-size iron powder in a solid state is 30 percent; the coarse-grained iron powder has a diameter of 300 μm and a solid volume fraction of 10%.
Example 6
This example differs from example 1 in that: and a high-pressure water descaling device is also arranged between the shearing machine 2 and the lifting device 3 and is used for descaling the mortise-tenon joint by high-pressure water.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. The utility model provides a hot rolling belted steel does not have connecting device of rolling intermediate billet which characterized in that: comprises a shearing machine and a composite rolling connecting mechanism which are sequentially arranged between a roughing mill and a finishing mill; the composite rolling connection mechanism comprises a lifting device, a powder paving device and a rolling device, wherein the lifting device is used for overlapping two adjacent intermediate blanks, the powder paving device is used for paving iron powder, and the rolling device is used for rolling the joint of the intermediate blanks.
2. The connecting device for the endless rolling of the hot rolled strip steel intermediate slab according to claim 1, characterized in that: the shearing machine is provided with a shearing tool for processing the end part of the intermediate billet into a mortise and tenon structure; and the shearing cutter is provided with an extrusion surface for processing the surface of the intermediate blank into a saw-toothed shape.
3. The connecting device for the endless rolling of the hot rolled strip steel intermediate slab according to claim 1, characterized in that: and a heating device for heating the iron powder is arranged on the powder paving device.
4. The connecting device for the endless rolling of the hot rolled strip steel intermediate slab according to claim 1, characterized in that: the iron powder is graded according to different particle sizes, and the liquid phase volume fraction of the iron powder is 45-65%.
5. The connecting device for the endless rolling of the hot rolled strip steel intermediate slab according to claim 1, characterized in that: the rolling device is provided with a heating system and can heat the roller to 500-900 ℃.
6. The connecting device for the endless rolling of the hot rolled strip steel intermediate slab according to claim 1, characterized in that: the powder spreading thickness of the iron powder is 1.5-2 times of the thickness of the iron powder after rolling.
7. The connecting device for the endless rolling of the hot rolled strip steel intermediate slab according to claim 1, characterized in that: the thickness of the intermediate blank after rough rolling is 25-35 mm, and the temperature is 980-1100 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121610773.3U CN215696780U (en) | 2021-07-15 | 2021-07-15 | Connecting device for hot-rolled strip steel endless rolling intermediate billet |
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| CN202121610773.3U CN215696780U (en) | 2021-07-15 | 2021-07-15 | Connecting device for hot-rolled strip steel endless rolling intermediate billet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115476116A (en) * | 2022-09-19 | 2022-12-16 | 西北有色金属研究院 | Preparation method of ultra-long titanium alloy plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115476116A (en) * | 2022-09-19 | 2022-12-16 | 西北有色金属研究院 | Preparation method of ultra-long titanium alloy plate |
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