Roll assembly and rolling mill unit for rolling special-shaped steel

Abstract

The roll assembly for rolling the special-shaped steel includes an upper roll (5), a lower roll (6), a left roll (9), and a right roll (8), the left roll has a left forming surface (7), the right roll has a right forming surface (81), the upper roll has an upper forming surface (51), and the lower roll has a lower forming surface (61), the left forming surface, the right forming surface, the upper forming surface, and the lower forming surface together surround a cavity, the upper roll and the lower roll can be moved up and down, and the left roll and the right roll can be moved left and right. The rolling mill unit includes at least two rolling mills, the rolling mill includes a frame and a roll assembly mounted on the frame, the roll assembly is applicable to special-shaped steels with similar shapes but different dimensions, and when the cavity wall of the cavity is worn, it can be compensated online, and there is no need to stop production to remove the rolls, ensuring production efficiency and saving the cost of purchasing rolls.

Description

Technical Field

[0001] The present invention belongs to the technical field of hot-rolled steel shapes, and specifically relates to a roll assembly and a rolling mill unit for rolling special-shaped steel.

Background Art

[0002] Currently, the rolling process for special-shaped steel generally involves passing a rectangular billet or square billet through a plurality of box-shaped holes, split holes, pre-forming cavities, and finishing holes, and finally rolling it into a special-shaped steel of the desired shape.

[0003] Taking forklift crossbeam steel as an example, forklift crossbeam steel is a steel material for manufacturing the crossbeam of the forklift fork bracket. Since it is supported by the load-bearing members of the forklift, there are high requirements for the performance, dimensional accuracy, and surface quality of forklift crossbeam steel. As shown in FIG. 1, the cross-section of the forklift crossbeam steel consists of a right trapezoidal region 1 and a rectangular region 2, which is a special-shaped steel. The width of the right trapezoidal region 1 is H1, the thickness is B1, the width of the rectangular region 2 is H, and the thickness is B. As shown in FIG. 2, the rolling unit of a conventional special-shaped steel rolling mill includes an upper rolling roll 3 and a lower rolling roll 4. The upper rolling roll 3 and the lower rolling roll 4 form a cavity conforming to the shape of the target special-shaped steel, and the steel material is rolled into the required shape when passing through the cavity.

[0004] For most forklift crossbeam steel of different specifications, since the thickness B1 of the right-angled trapezoidal region 1 is the same as the width H1, the special-shaped steel rolling mill can make the width H and thickness B of the rectangular region 2 of the forklift crossbeam steel adjustable, and the special-shaped steel rolling mill can be made common for most forklift crossbeam steels of different specifications. However, in the prior art, the forklift crossbeam steel rolled by the special-shaped steel rolling mill using the upper rolling roll 3 and the lower rolling roll 4 has a small adjustment range for the width H and thickness B of the rectangular region, the production efficiency of multi-specification forklift crossbeam steel in the workplace is low, and the input of the rolling roll is large. And after the rolling roll is worn, the only option is to replace the rolling roll, the consumption of the rolling roll is large, and the cost is further increased.

[0005] Therefore, it is necessary to provide an improvement technical solution for the deficiencies of the above prior art.

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present invention is to overcome the problems of low production efficiency and high cost of the special-shaped steel rolling mill unit in the above prior art.

Means for Solving the Problems

[0007] To achieve the above object, the present invention provides a left roll having a left forming surface, a right roll having a right forming surface, an upper roll having an upper forming surface, a lower roll having a lower forming surface, and the left forming surface, the right forming surface, the upper forming surface, and the lower forming surface together enclose to form a cavity, the upper roll and the lower roll are each movable in the vertical direction, the left roll and the right roll are each movable in the horizontal direction, and provides a roll assembly for rolling special-shaped steel.

[0008] Furthermore, at least one of the left forming surface and the right forming surface is non-planar.

[0009] Furthermore, the left forming surface is non-planar, and the left forming surface includes a first plane, a second plane, and an inclined surface. The first plane and the second plane are parallel and extend in the vertical direction, and the inclined surface connects the first plane and the second plane.

[0010] Furthermore, a movable space is formed between the left roll and the right roll, and the upper roll and the lower roll move up and down in the movable space.

[0011] Furthermore, the second plane is located in the lower left direction of the first plane, and the lower roll moves in the space between the second plane and the right roll.

[0012] It includes at least two rolling mills, and the rolling mill is a rolling mill unit including a frame and a roll assembly provided on the frame. The roll assembly includes an upper roll, a lower roll, a left roll, and a right roll. The left roll has a left forming surface, the right roll has a right forming surface, the upper roll has an upper forming surface, and the lower roll has a lower forming surface. The left forming surface, the right forming surface, the upper forming surface, and the lower forming surface together enclose to form a cavity. The upper roll and the lower roll are each movable in the vertical direction. The left roll and the right roll are each movable in the horizontal direction.

[0013] Furthermore, at least one of the left forming surface and the right forming surface is non-planar.

[0014] Furthermore, the left forming surface is non-planar, and the left forming surface includes a first plane, a second plane, and an inclined surface. The first plane and the second plane are parallel and extend in the vertical direction, and the inclined surface connects the first plane and the second plane.

[0015] Furthermore, a movable space is formed between the left roll and the right roll, and the upper roll and the lower roll move up and down in the movable space.

[0016] Furthermore, the second plane is located in the lower left direction of the first plane, and the lower roll moves in the space between the second plane and the right roll.

[0017] Furthermore, the rolling mills are arranged in sequence on the rolling line. The distances between the left forming surface and the right forming surface in the roll assembly of each rolling mill are different, and one of the rolling mills is selected and put into the rolling operation during rolling.

[0018] Furthermore, the number of rolling mills in the rolling mill unit is 5 or less.

Advantages of the Invention

[0019] The technical solution provided by the present invention has at least the following excellent effects compared with the closest prior art. 1) It can be applied to special-shaped steels with similar shapes but different dimensions. When the cavity wall of the cavity wears, it can be compensated online, eliminating the need to stop production and remove the rolls, ensuring production efficiency and saving the roll purchase cost. 2) At least one of the left forming surface and the right forming surface is non-planar, which can be preferably adapted to the rolling of special-shaped steel. 3) It can be adapted to the rolling of forklift crossbeam steel. 4) Even when the inclined surface wears, it can be adjusted online. 5) The supporting force received by the special-shaped steel is dispersed on the lower forming surface with a large area, reducing the wear rate of the lower forming surface. 6) When rolling special-shaped steels with different shapes, instead of switching the production line of the rolling mill, by switching the rolling mill, the floor area is small, the switching speed is fast, and the production efficiency is high.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying out the Invention

[0021] Hereinafter, the technical solutions in the embodiments of the present invention will be clearly and completely described. It is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art belong to the protection scope of the present invention.

[0022] Hereinafter, with reference to the drawings, the present invention will be described in detail based on the embodiments. In addition, when there is no contradiction, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0023] In a specific embodiment of the rolling mill unit of the present invention, the rolling mill unit is used for the rolling of special-shaped steel, and includes at least two rolling mills. The number of rolling mills can be adjusted based on the types and specifications of the special-shaped steel that the rolling production line needs to roll. It is preferable to install 3 to 5 rolling mills in each group of rolling mill units. The distance between the left forming surface 7 and the right forming surface 81 in the roll assembly of each rolling mill is different, and one of the rolling mills is selected to be put into the rolling operation during rolling.

[0024] The rolling mill includes a frame and a roll assembly (hereinafter referred to as the roll assembly) provided on the frame for rolling special-shaped steel. The roll assembly includes an upper roll 5, a lower roll 6, a left roll 9, and a right roll 8. The left roll 9 has a left forming surface 7, the right roll 8 has a right forming surface 81, the upper roll 5 has an upper forming surface 51, and the lower roll 6 has a lower forming surface 61. The left forming surface 7, the right forming surface 81, the upper forming surface 51, and the lower forming surface 61 together enclose to form a cavity. The upper roll 5 and the lower roll 6 are each movable in the vertical direction, and the left roll 9 and the right roll 8 are each movable in the horizontal direction. Based on the differences in the shapes of the target special-shaped steel, a roll assembly with different forming surfaces is selected. The cavities surrounded by different roll assemblies are different, that is, the forming surface shapes of the upper roll 5, the lower roll 6, the left roll 9, and the right roll 8 are different. If there are several shapes of special-shaped steel, there are several sets of roll assemblies. The present invention cannot list examples one by one, and a roll assembly for rolling forklift crossbeam steel will be described as an example.

[0025] As shown in FIG. 3, a movable space is formed between the left roll 9 and the right roll 8, and the upper roll 5 and the lower roll 6 move up and down in the movable space. The left forming surface 7 is non-planar. The left forming surface 7 includes a first plane 71, a second plane 72, and an inclined surface 73. The first plane 71 and the second plane 72 are parallel and extend in the vertical direction. The inclined surface 73 connects the first plane 71 and the second plane 72. The second plane 72 is located in the lower left direction of the first plane 71. The lower roll 6 moves in the space between the second plane 72 and the right roll 8. That is, the cavity wall of the cavity has a rolling groove, and the shape of the rolling groove is a right trapezoid, and it is surrounded by the inclined surface 73, a part of the second plane 72, and a part of the lower forming surface 61.

[0026] The cross-sectional shape of the cavity corresponds to the cross-sectional shape of the forklift crossbeam steel and includes a right trapezoid region and a rectangular region. The boundary of the right trapezoid region is limited by a part of the second plane 72, the inclined surface 73, and a part of the lower forming surface 61. The boundary of the rectangular region is limited by the upper forming surface 51, a part of the lower forming surface 61, the left forming surface 7, and a part of the first plane 71.

[0027] When wear occurs on the roll assembly, it can be compensated for online. Specifically, when the upper forming surface 51 wears by 1 mm and the upper forming surface 51 moves up by 1 mm, the thickness B of the rolled finished product becomes 1 mm thicker than the standard. In this case, by simply moving the upper roll 5 down by 1 mm, the 1 mm wear of the upper forming surface 51 can be compensated. By controlling to return the thickness B of the rectangular portion 2 of the forklift crossbeam steel to the reference dimension, the roll assembly can be adjusted online without stopping rolling, removing the roll assembly, and performing cavity repair, without affecting subsequent continuous rolling. When the dimensions of the rolled material exceed the standard again due to cavity wear, the position of the upper roll 5 can be readjusted to compensate for the wear.

[0028] When the lower forming surface 61 wears by 1 mm and the lower forming surface 61 moves down by 1 mm, the thicknesses B and B1 of the rolled product become 1 mm thicker than the standard. In this case, by simply moving the lower roll 6 up by 1 mm, the 1 mm wear of the lower forming surface 61 can be compensated. By controlling to return the thickness B of the rectangular portion 2 and the B1 of the right trapezoidal portion 1 of the forklift crossbeam steel to the reference dimension, the roll assembly can be adjusted online without stopping rolling, removing the roll, and performing cavity repair, without affecting subsequent continuous rolling. When the dimensions of the rolled material exceed the standard again due to cavity wear, the position of the lower roll 6 can be readjusted to compensate for the wear.

[0029] When the right forming surface 81 wears by 1 mm, the width H of the rolled finished product becomes 1 mm larger than the standard. In this case, by simply moving the right roll 8 to the left by 1 mm (or moving the left roll 9 to the right by 1 mm), the 1 mm wear of the right roll 8 can be compensated. By controlling to return the width H of the rectangular portion 2 of the forklift crossbeam steel to the reference dimension, the roll assembly can be adjusted online without stopping rolling, removing the roll, and performing cavity repair, without affecting subsequent continuous rolling. When the dimensions of the rolled material exceed the standard again due to cavity wear, the position of the right roll 8 or the left roll 9 can be readjusted to compensate for the wear.

[0030] When the first plane 71, the second plane 72, and the inclined plane 73 are all worn by 1 mm, the width H of the rolled finished product becomes 1 mm larger than the standard. In this case, by moving the left roll 9 1 mm to the right (or moving the right roll 8 1 mm to the left) only, the 1-mm wear of the first plane 71, the second plane 72, and the inclined plane 73 can be compensated. By controlling the width H of the rectangular portion 2 of the forklift crossbeam steel to return to the reference dimension, the roll assembly can be adjusted online without stopping the rolling, removing the rolls, and repairing the cavity, and it will not affect the subsequent continuous rolling. When the dimensions of the rolled material exceed the standard again due to cavity wear, the position of the left roll 9 or the right roll 8 can be readjusted to compensate for the wear.

[0031] When the inclined plane 73 is worn by 1 mm, the thickness B1 of the rolled finished product becomes 1 mm larger than the standard. In this case, by moving the upper roll 5 and the lower roll 6 up by 1 mm simultaneously, the 1-mm wear of the inclined plane 73 can be compensated. By controlling and re-controlling the thickness B1 of the right trapezoidal portion 1 of the forklift crossbeam steel to the reference dimension, the roll assembly can be adjusted online without stopping the rolling, removing the rolls, and repairing the cavity, and it will not affect the subsequent continuous rolling. When the dimension B1 of the rolled material exceeds the standard again due to cavity wear, the upper roll 5 and the lower roll 6 can be adjusted simultaneously again to compensate for the wear of the inclined plane 73.

[0032] Also, when it is necessary to roll forklift crossbeam steels with the same dimensions in the right trapezoidal region and different widths H and thicknesses B in the rectangular region, by replacing with other rolling mills in the rolling mill unit (the upper forming surface 51 and the lower forming surface 61 of the roll assembly of the rolling mill after replacement are adapted to the width H of the target forklift crossbeam steel), rolling production can be realized, and the structure is simple and the cost is low.

[0033] When rolling several forklift crossbeam steel sections with small dimensional differences, by controlling the positions of the upper roll 5, lower roll 6, left roll 9, and right roll 8, the dimensions of the cavity-corresponding parts can be adjusted to conform to the dimensions of each part of the target forklift crossbeam steel section. Moving the upper roll 5 downward, moving the lower roll 6 upward, or performing both operations simultaneously (the adjustment range is large when performing both operations simultaneously) can reduce the thickness B of the rectangular area. Moving the upper roll 5 upward, moving the lower roll 6 downward, or performing both operations simultaneously (the adjustment range is large when performing both operations simultaneously) can increase the thickness B of the rectangular area. However, moving the lower roll 6 up and down not only adjusts the thickness B of the rectangular area but also adjusts the thickness B1 of the right trapezoidal area.

[0034] Moving the left roll 9 to the right, moving the right roll 8 to the left, or performing both operations simultaneously can reduce the width H of the rectangular area. Moving the left roll 9 to the left, moving the right roll 8 to the right, or performing both operations simultaneously can increase the width of the rectangular area. When the upper roll 5 and the lower roll 6 move upward simultaneously with the same stroke, if the thickness B of the rectangular area remains unchanged, the thickness B1 of the right trapezoidal area can be reduced. When the upper roll 5 and the lower roll 6 move downward simultaneously with the same stroke, if the thickness B of the rectangular area remains unchanged, the thickness B1 of the right trapezoidal area can be increased.

[0035] The specific embodiments of the roll assembly for rolling profiled steel of the present invention are the same as the structure of the roll assembly in the specific embodiments of the above roll assembly, so the description is omitted.

[0036] As described above, the roll assembly and rolling mill unit for rolling profiled steel adopted by the present invention have the following technical effects compared with the prior art.

[0037] 1) It can be applied to special-shaped steels with similar shapes but different dimensions. When the cavity walls of the cavity wear, it can be compensated online, eliminating the need to stop production and remove the rolls, ensuring production efficiency and saving the roll purchase cost. 2) At least one of the left forming surface and the right forming surface is non-planar and can be preferably adapted to the rolling of special-shaped steels. 3) It can be adapted to the rolling of forklift crossbeam-shaped steel. 4) Even when the inclined surface wears, it can be adjusted online. 5) The supporting force received by the special-shaped steel is dispersed on the lower forming surface with a large area, reducing the wear rate of the lower forming surface. 6) When rolling special-shaped steels of different shapes, instead of switching the production line of the rolling mill, by switching the rolling mill, it has a small floor area, a fast switching speed, and high production efficiency.

[0038] The above are only preferred embodiments of the present invention and do not limit the present invention. Any corrections, equivalent substitutions, improvements, etc. made within the spirit and principle scope of the present invention are all within the protection scope of the claims of the present invention.

Description of Reference Signs

[0039] 1 Right-angled trapezoidal part 2 Rectangular part 3 Upper rolling roll 4 Lower rolling roll 5 Upper roll 51 Upper forming surface 6 Lower roll 61 Lower forming surface 7 Left forming surface 71 First plane 72 Second plane 73 Inclined surface 8 Right roll 81 Right forming surface 9 Left roll

Claims

1. a left roll having a left forming surface, a right roll having a right forming surface, an upper roll having an upper forming surface, a lower roll having a lower forming surface, and the left forming surface, the right forming surface, the upper forming surface, and the lower forming surface together enclose to form a cavity, the upper roll and the lower roll are each movable in the vertical direction, the left roll and the right roll are each movable in the horizontal direction, the left forming surface is non-planar and includes a first plane, a second plane, and an inclined surface, the first plane and the second plane are parallel and extend in the vertical direction, the inclined surface connects the first plane and the second plane, the second plane is located in the lower left direction of the first plane, and the lower roll moves in the space between the second plane and the right roll, the cross-sectional shape of the cavity includes a right trapezoidal region and a rectangular region, the boundary of the right trapezoidal region is limited by a part of the second plane, the inclined surface, and a part of the lower forming surface, and the boundary of the rectangular region is limited by the upper forming surface, another part of the lower forming surface, and a part of the first plane, A roll assembly for rolling special-shaped steel, characterized in that.

2. A movable space is formed between the left roll and the right roll, and the upper roll and the lower roll move up and down in the movable space. The roll assembly for rolling special-shaped steel according to claim 1, characterized in that.

3. including at least two rolling mills, the rolling mill includes a frame and a roll assembly for rolling special-shaped steel according to claim 1 or 2 provided on the frame. A rolling mill unit, characterized in that.

4. The rolling mills are arranged in sequence on the rolling line, the distances between the left forming surface and the right forming surface in the roll assemblies of the rolling mills are different, and one of the rolling mills is selected and put into the rolling operation during rolling. The rolling mill unit according to claim 3, characterized in that.

5. The number of the rolling mills in the rolling mill unit is 5 or less. The rolling mill unit according to claim 4, characterized in that.

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