CN110560485A - Hot-rolled strip steel endless rolling intermediate billet connecting system and method - Google Patents

Abstract

The invention belongs to the technical field of iron and steel rolling, and relates to a connection system and method for a hot-rolled strip steel endless rolling intermediate billet. The connection system includes a rough rolling mill, a hot coil box, a shearing machine, a crimping machine and a finishing mill. The moving direction of the intermediate billet, the rough rolling mill, the shearing machine, the crimping machine and the finishing rolling mill are arranged in sequence, and the middle of the two adjacent sections is fixed by the crimping machine with convex and concave cylindrical pressure rollers. Crimping is carried out at the overlapped joints of billets, and the two adjacent sections of intermediate billets are forced to be connected by the pressure of protrusions and depressions. The process and equipment of this scheme are simple, which reduces the modification of production line layout due to technical transformation and reduces the cost of endless rolling. The difficulty of implementing the process. The use of toothed pressure rollers to connect intermediate blanks can meet the needs of connecting intermediate blanks of different widths and thicknesses, improve connection efficiency, and reduce equipment costs.

Description

A connection system and method for hot-rolled strip endless rolling intermediate billets

technical field

The invention belongs to the technical field of iron and steel rolling, and relates to a connection system and method for a hot-rolled strip steel endless rolling intermediate billet.

Background technique

Endless rolling of hot-rolled strip refers to the process of rolling the billet in the finish rolling stage without splitting the billet into pieces, one-time strip threading, and continuous finish rolling. The rolled strip is cut into coils of required weight by high-speed flying shears. Compared with conventional hot-rolled single-block rolling, endless rolling has the following significant advantages: Eliminate unstable parts in the strip rolling process, stabilize quality, and increase yield; realize ultra-thin and wide-thin products Production; when rolling thin strips, the production is stable and the productivity is improved; the strip tension between the racks is kept stable, so that the thickness and flatness deviation of the strip is reduced; the times of strip threading and tail flicking are reduced, and the number of pairs of rolls is reduced. The impact and damage; the product structure and performance are more uniform.

The existing conventional hot continuous rolling production is changed to endless rolling production. The most critical technical problem is the connection of the intermediate billet after rough rolling. Since the endless rolling adopts the strip tension rolling mode, and the second flow rate of the intermediate billet and the finishing mill must be kept equal, the connecting speed and quality of the intermediate billet in the hot state affect whether the endless rolling can be realized: if the connecting speed is too slow If the time is too long, it will not only affect the production efficiency, but also cause a significant temperature drop, making it difficult to carry out the subsequent finish rolling; if the connection strength is not high and the quality is not good, the connection is prone to breakage, making continuous finish rolling impossible; moreover What is important is that since the conventional hot rolling endless rolling is mainly aimed at the transformation of the existing hot continuous rolling production line, the space of the production line has been fixed, so the connecting equipment should not be huge and complicated, otherwise it will not only limit the installation position of the equipment, but also It will increase investment and production maintenance costs.

The prior art discloses the method of using special molds to connect the connecting parts of the intermediate blanks, but these methods need to use different molds when connecting intermediate blanks of different widths or different thicknesses, so the spare molds have a large storage capacity and low economic efficiency ; When the specifications of the connected intermediate blank change, the mold needs to be replaced, and the production efficiency is reduced.

Contents of the invention

In view of this, the purpose of the present invention is to provide a hot-rolled strip endless rolling intermediate billet connection system and method, which are used to solve the problems of large mold storage and low production efficiency in the existing intermediate billet mold connection technology.

To achieve the above object, the present invention provides the following technical solutions:

A method for connecting hot-rolled strip endless rolling intermediate billets, comprising: providing a roughing mill for rough rolling, a shearing machine for shearing the intermediate billets, a crimping machine for connecting the intermediate billets, and a finishing machine for finishing The finishing mill for rolling; the crimping machine includes at least one pair of pressing rollers, one of which is provided with a protrusion, and the other pressing roller is provided with a depression matching the protrusion; the intermediate billet is rough rolled in the rough rolling mill Finally, after passing through the shearing machine, the shearing machine cuts the adjacent two sections of intermediate blanks, and crimps the overlapping parts of the adjacent two sections of intermediate blanks through the pressing rollers with protrusions and the pressing rollers with depressions. , through the pressure of the protrusions and depressions to connect the two adjacent sections of the intermediate billets; the two adjacent sections of the intermediate billets are connected and enter the finishing mill for finishing rolling.

Optionally, the present invention adopts the method of adjusting the reduction amount of the pressure roller to control different reduction depths, so as to meet the connection of intermediate blanks with different thicknesses.

Optionally, the protrusions are one or more "rectangular" protrusions, and the depressions are one or more "rectangular" depressions matching the shape of the protrusions.

Optionally, the thickness of the intermediate blank is 25mm-40mm, the height of the "rectangular" protrusion of the pressure roller of the crimping machine is at least 30mm, and the depth of the "rectangular" depression of the pressure roller of the crimping machine is at least 30mm.

Optionally, the width of the "rectangular" protrusion of the pressure roller of the crimping machine is smaller than the width of the "rectangular" depression of the pressure roller, and the difference is 5 mm to 20 mm.

Optionally, the protrusions are one or more "trapezoidal" protrusions, and the depressions are one or more "trapezoidal" depressions matching the shape of the protrusions.

Optionally, the protrusions are one or more "V-shaped" protrusions, and the depressions are one or more "V-shaped" depressions matching the shape of the protrusions.

Optionally, the temperature when the intermediate blanks are connected is 950°C to 1100°C.

A connection system for hot-rolled strip steel endless rolling intermediate billet, comprising a roughing mill, a shearing machine, a crimping machine and a finishing mill, the shearing machine includes a cutter for shearing the intermediate billet, the press The pick-up machine includes at least one pair of pressing rollers, one of which is provided with a protrusion, and the other pressing roller is provided with a depression at the position matching the protrusion; according to the moving direction of the intermediate billet, the rough rolling mill, The shearing machine, the crimping machine and the finishing rolling machine.

Optionally, a hot coil box is provided between the rough rolling mill and the shearing machine.

Optionally, a high-pressure water descaling device is provided between the shearing machine and the crimping machine.

Optionally, a deburring machine is provided between the crimping machine and the finishing mill.

Optionally, a straightening machine is provided between the rough rolling mill and the shearing machine.

Optionally, a lapping device is provided between the shearing machine and the crimping machine, for overlapping and lapping the ends of two adjacent sections of intermediate billets.

The beneficial effects of the present invention are:

In the present invention, the connection speed of two adjacent sections of intermediate blanks is fast, and the connection can be quickly completed by crimping two adjacent sections of intermediate blanks through a crimping machine; the crimping machine connects the intermediate blanks by rolling, and the crimping machine does not Walking along with the steel strip reduces the space occupied by the connecting equipment; the structure is simple, the floor space is small, and it can be more widely used in the reconstruction of the existing production line with limited space; after the intermediate billet is descaled by high-pressure water, it has convex The crimping machine that fits with the recessed gap squeezes and connects the overlapping intermediate billets, and the high-temperature non-oxidized metal flows to the gap between the teeth under the action of extrusion, and the metal flow strengthens the connection reliability; the toothed pressure roller is adopted To connect the intermediate billets, adjust the different reductions of the pressure rollers online to meet the connection of intermediate billets of different widths and thicknesses, improve the connecting efficiency and reduce the production cost.

Other advantages, objects and features of the present invention will be set forth in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or can be obtained from It is taught in the practice of the present invention. The objects and other advantages of the invention may be realized and attained by the following specification.

Description of drawings

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

Fig. 1 is a schematic diagram of the system of the present invention;

Fig. 2 is the enlarged view of I place in Fig. 1;

Fig. 3 is a schematic diagram of a cylindrical pressure roller of a crimping machine;

Figure 4 is a schematic diagram of the connection of the crimping machine.

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should not be construed as limiting the present invention; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.

In the drawings of the embodiments of the present invention, the same or similar symbols correspond to the same or similar components; , "front", "rear" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred devices or elements must It has a specific orientation, is constructed and operated in a specific orientation, so the terms describing the positional relationship in the drawings are for illustrative purposes only, and should not be construed as limiting the present invention. For those of ordinary skill in the art, the understanding of the specific meaning of the above terms.

Please refer to Fig. 1-Fig. 2, the component numbers in the accompanying drawings represent respectively: the first intermediate billet 2, the second intermediate billet 1, the rough rolling mill 3, the hot coil box 4, the straightening machine 5, the shearing machine 6, the high pressure water Descaling device 7, lapping device 8, crimping machine 9, deburring machine 10, finishing mill 11.

As shown in Fig. 1 and Fig. 2, the present embodiment provides a connection system for the endless rolling of hot-rolled steel strips. After the rough rolling mill 3, between the hot coil box 4 and the finishing mill 11, a leveler is arranged. 5. Shearing machine 6, high-pressure water descaling device 7, lapping device 8, crimping machine 9 and deburring machine 10.

This protocol includes the following steps:

S1 Straighten the head and tail parts of the adjacent two sections of intermediate blanks (the first intermediate blank 2 and the second intermediate blank 1) through the straightening machine 5;

S2 cut off the irregular shapes of the first intermediate blank 2 and the second intermediate blank 1 head and tail by the shearing machine 6;

S3 descaling the first intermediate billet 2 and the second intermediate billet 1 that need to be overlapped and overlapped by high pressure water descaling device 7;

S4 overlapping and overlapping the head and tail parts of the first intermediate blank 2 and the second intermediate blank 1 through the overlapping device 8;

S5 connects the overlapping parts of the first intermediate blank 2 and the second intermediate blank 1 in step S4 by the crimping machine 9;

S6 removes the burrs at the connecting parts of the first intermediate billet 2 and the second intermediate billet 1 in step S5 through the deburring machine 10, so as to prevent the burrs from damaging the rolls of the finishing mill, so as to ensure the smooth progress of the endless rolling;

In S7 , finish rolling is performed on the connected first intermediate billet 2 and second intermediate billet 1 by the finishing mill 11 .

The above steps can respectively adopt the following specific schemes and bring the following technical effects:

In step S1, use the straightening machine 5 to straighten the head and tail parts of the first intermediate blank 2 and the second intermediate blank 1, so that the upper and lower intermediate blanks can be closely attached to each other during the subsequent lapping process. Combined, it can reduce the iron oxide scale caused by air residue;

In step S2, use the shearing machine 6 to cut off the irregular parts of the head and tail of the first intermediate blank 2 and the second intermediate blank 1, so that the intermediate blanks can be completely overlapped in the width direction during the subsequent lapping process, Can increase the connection area;

In step S3, the high-pressure water descaling device 7 is used to descale the joint parts of the first intermediate blank 2 and the second intermediate blank 1 with high-pressure water, so as to prevent the presence of oxide scale from affecting the connection effect of the intermediate blanks , in specific operation steps, the descaling pressure of high pressure water is 18Mpa～22Mpa;

In step S4, using the overlapping device 8 to overlap and overlap the head and tail of the first intermediate blank 2 and the second intermediate blank 1, the overlapping time is less than 5s, which can prevent the generation of iron scale under high temperature conditions;

In step S5, the overlapping parts of the first intermediate blank 2 and the second intermediate blank 1 are crimped using a crimping machine 9 with convex and concave cylindrical pressure rollers, and the first intermediate blank is forced by the pressure of the projections and depressions 2. The second intermediate billet 1 is connected, and the protrusions and depressions of the pressure rollers are clearance fit in the width direction. The non-oxidized metal in the high temperature state flows to the gap between the teeth under the action of extrusion, and the mutual contact between the two intermediate billet metals The flow enhances the reliability of the connection; the pair of cylindrical pressing rollers of the above-mentioned crimping machine 9 have matching protrusions and depressions.

When the upper pressing roller is raised, the amount of reduction is defined as the distance between the top of the protrusion and the upper surface of the upper intermediate billet when the crimping is completed; when the lower pressing roller is raised, the amount of reduction is defined as the protrusion when the crimping is completed The distance between the top and the lower surface of the next intermediate billet.

In step S6, after the first intermediate billet 2 and the second intermediate billet 1 are connected, the deburring machine is used to remove the burrs at the connecting parts, which can prevent the burrs from damaging the rolls of the finishing mill and ensure the smooth progress of the endless rolling.

Example 1

In this embodiment, a pair of cylindrical pressing rollers of the crimping machine 9 have matching "rectangular" protrusions and "rectangular" depressions.

The thickness of the intermediate blank is 25mm, the width is 900mm, and the temperature when the intermediate blank is connected is 1030°C.

The "rectangular" protrusion height of the pressure roller of the crimping machine is 32.5mm, and the "rectangular" concave depth is 33mm.

The width of the "rectangular" protrusion of the pressure roller of the crimping machine is 130mm, and the width of the "rectangular" depression is 135mm.

The body length of the cylindrical pressure roller of the crimping machine is 1200mm, and the length of the "rectangular" protrusion and depression of the pressure roller is 1200mm.

When connecting, the pressing amount of the pressing roller of the crimping machine is 32.5mm.

Example 2

In this embodiment, a pair of cylindrical pressing rollers of the crimping machine 9 have matching "rectangular" protrusions and "rectangular" depressions.

The thickness of the intermediate blank is 28mm, the width is 1200mm, and the temperature when the intermediate blank is connected is 1080°C.

The height of the "rectangular" protrusion of the pressure roller of the crimping machine is 50mm, and the depth of the "rectangular" depression is 52mm.

The width of the "rectangular" protrusion of the pressure roller of the crimping machine is 180mm, and the width of the "rectangular" depression is 193mm.

The body length of the cylindrical pressure roller of the crimping machine is 1800mm, and the length of the "rectangular" protrusion and depression of the pressure roller is 1800mm.

When connecting, the pressing amount of the pressing roller of the crimping machine is 38.6mm.

Example 3

The difference between this embodiment and embodiment 2 is that the thickness of the intermediate billet is 35 mm and the width is 1800 mm. The parameters of Example 2 are still used, but when connecting, the pressing amount of the pressing roller of the crimping machine is 49mm.

Example 4

The difference between this embodiment and the above-mentioned embodiment is that although the pair of cylindrical pressure rollers of the crimping machine also have matching protrusions and depressions, the shapes of the protrusions and depressions are different, and the protrusions are one or a plurality of "trapezoidal" protrusions, and the depression is one or more "trapezoidal" depressions.

Example 5

The difference between this embodiment and the above-mentioned embodiment is that although the pair of cylindrical pressure rollers of the crimping machine have matching protrusions and depressions, the shapes of the protrusions and depressions are different, and the protrusions are the The protrusions are one or more "rectangular" protrusions and the depressions are one or more "rectangular" depressions.

Example 6

The difference between this embodiment and the above embodiment is that although the pair of cylindrical pressing rollers of the crimping machine have matching protrusions and depressions, the shapes of the protrusions and depressions are different, and the protrusions are one or A plurality of "V-shaped" protrusions, said depression being one or more "V-shaped" depressions.

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

Claims (10)

1. A hot-rolled steel strip endless rolling intermediate billet connecting method is characterized in that, comprising: Provision of roughing mills for rough rolling, shearing machines for shearing intermediate billets, crimping machines for joining intermediate billets and finishing mills for finishing rolling; The crimping machine includes at least one pair of pressing rollers, one of which is provided with a protrusion, and the other pressing roller is provided with a depression matching the protrusion; After the intermediate billet is roughly rolled by the rough rolling mill, it passes through the shearing machine, and the shearing machine cuts two adjacent sections of the intermediate billet, and passes through the pressing rollers with protrusions and the pressing rollers with depressions. The overlapping parts of the two adjacent intermediate blanks are crimped, and the adjacent two intermediate blanks are connected by the pressure of the protrusion and the depression; The two adjacent sections of intermediate billets are connected and enter the finishing mill for finishing rolling. 2. The method for connecting hot-rolled strip steel endless rolling intermediate blanks as claimed in claim 1, characterized in that, the mode of adjusting the reduction of pressure rollers is used to control different depths of reduction, so as to meet the requirements of intermediate blanks of different thicknesses. connect. 3. The method for connecting hot-rolled steel strip endless rolling intermediate blanks as claimed in claim 1, wherein the protrusions of the pressing rollers of the crimping machine are one or more "rectangular" protrusions, and the pressing The pick-up roller is recessed as one or more "rectangular" recesses that match the shape of the protrusions. 4. The method for connecting hot-rolled steel endless rolling intermediate blanks as claimed in claim 1, characterized in that the thickness of the intermediate blanks is 25 mm to 40 mm, and the minimum height of the "rectangular" protrusions of the pressure rollers of the crimping machine is 30mm, the minimum depth of the "rectangular" depression of the pressure roller of the crimper is 30mm. 5. The method for connecting hot-rolled steel strip endless rolling intermediate blanks as claimed in claim 1, wherein the width of the "rectangular" bulge of the pressure roller of the crimping machine is smaller than the width of the "rectangular" depression of the pressure roller, which The difference is 5mm to 20mm. 6. The method for connecting hot-rolled steel strip endless rolling intermediate blanks as claimed in claim 3, wherein the convex shape is "trapezoidal" or "V-shaped", and the concave shape is in line with the convex shape The shape matches the "trapezoid" or "V-shape". 7. A connection system for hot-rolled steel strip endless rolling intermediate billet, characterized in that it comprises a roughing mill, a shearing machine, a crimping machine and a finishing mill, and the shearing machine includes a Cutter, the crimping machine includes at least one pair of pressing rollers, one of which is provided with a protrusion, and the other pressing roller is provided with a depression matching the protrusion; according to the moving direction of the intermediate blank, set the The rough rolling mill, the shearing machine, the crimping machine and the finishing rolling mill. 8. The connection system for the endless rolling blank of hot strip steel as claimed in claim 7, characterized in that, a hot coil box is arranged between the rough rolling mill and the shearing machine. 9. The connecting system of the hot-rolled strip steel endless rolling intermediate billet as claimed in claim 7, characterized in that, a high-pressure water descaling device is provided between the shearing machine and the crimping machine. 10. The connecting system for endless rolling blanks of hot-rolled steel strips as claimed in claim 7, characterized in that a deburring machine is provided between the crimping machine and the finishing mill.