Two-roller straightening device

Abstract

The utility model provides a two-roller straightening device which comprises a machine frame, an upper straightening roller and a lower straightening roller, and the upper straightening roller and the lower straightening roller are arranged on the machine frame and used for straightening long-strip-shaped rolled pieces. The upper straightening roll comprises a concave cylindrical upper straightening roll body, and the diameter of the middle of a roll body of the upper straightening roll body is larger than that of the two ends. The lower straightening roll comprises a convex cylindrical lower straightening roll body, the diameter of the middle of a roll body of the lower straightening roll body is smaller than the diameters of the two ends of the roll body, the upper straightening roll further comprises upper straightening roll extending sections extending out of the two ends of the upper straightening roll body, and the lower straightening roll further comprises lower straightening roll extending sections extending out of the two ends of the lower straightening roll body. A rolled piece is located between the upper straightening roll body and the lower straightening roll body, and a gap for containing the rolled piece is reserved when the concave radian of the upper straightening roll body is matched with the convex radian of the lower straightening roll body. Through the special shape design of the upper straightening roll and the lower straightening roll, the contact area between the straightening rolls and the rolled piece can be increased, the straightening force is distributed more uniformly, and excessive local deformation of the rolled piece is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal material processing technical field, especially a two roll straightening device. BACKGROUND

[0002] In the drawing, rolling, extrusion and other processing of metal materials, due to the uneven distribution of internal stress, uneven cooling and other factors, the processed metal rod, profile and other long strip-shaped rolled pieces often appear bending, distortion and other deformation phenomena. In order to meet the subsequent processing and use requirements, the deformation of the rolled piece needs to be straightened.

[0003] At present, the commonly used straightening methods mainly include:

[0004] Multi-roll straightening: multi-roll straightening is to use multiple sets of straightening rolls to repeatedly bend and unbend the rolled piece, so as to gradually eliminate its internal stress and achieve the purpose of straightening. This method has high straightening precision and efficiency, and is suitable for rolled pieces of various specifications and materials, but the equipment structure is complex and the cost is high.

[0005] Pressure straightening: pressure straightening is to use hydraulic or mechanical devices to apply axial pressure to the rolled piece to make it produce plastic deformation, thereby eliminating bending. This method is simple to operate and has low cost, but the straightening precision is not high, and it is suitable for rolled pieces with small bending degree.

[0006] Flame straightening: flame straightening is to use flame to heat the local part of the rolled piece to make it produce thermal expansion and contraction, thereby changing its bending shape. This method is flexible to operate and is suitable for large and complex shaped rolled pieces, but it requires higher experience of the operator, and is easy to cause oxidation and performance change of the rolled piece surface.

[0007] However, the above existing technologies have the following technical problems:

[0008] Multi-roll straightening: although the straightening effect is good, the equipment is complex and the cost is high, which is too high for some small enterprises or occasions with low straightening precision requirements.

[0009] Pressure straightening: the straightening precision is not high, which is difficult to meet the requirements of high-precision products, and is easy to cause surface damage of the rolled piece.

[0010] Flame straightening: the operation is difficult and the efficiency is low, and it is easy to cause oxidation and performance change of the rolled piece surface, which affects the product quality.

[0011] In addition, the traditional two-roll straightening device usually adopts the design that the upper and lower straightening rolls are both cylindrical, which has the following defects:

[0012] The rolled piece is easy to slip: due to the small contact area between the cylindrical roll and the rolled piece, the slipping phenomenon is easy to occur in the straightening process, which affects the straightening effect and efficiency.

[0013] Uneven distribution of straightening force: The straightening force applied by the cylindrical roller to the workpiece is concentrated near the contact line, which can easily cause excessive local deformation of the workpiece or even fracture.

[0014] Unable to form pre-bend: The traditional two-roll straightening device cannot pre-bend the rolled piece, which is not conducive to eliminating residual stress and affects the straightening effect. Utility Model Content

[0015] The purpose of the utility model is to provide a two-roller straightening device that can make the straightening force distribution more uniform, help eliminate residual stress, thereby improving the straightening accuracy and efficiency and reducing surface damage of the rolled piece.

[0016] The utility model solves the above technical problems through the following technical solutions:

[0017] A two-roller straightening device comprises a frame and upper and lower straightening rollers mounted on the frame, and is used to straighten elongated rolled workpieces. The upper straightening roller comprises a concave cylindrical upper straightening roller body, the diameter of which is greater in the middle of the roller body than at the ends; the lower straightening roller comprises a convex cylindrical lower straightening roller body, the diameter of which is less in the middle of the roller body than at the ends. The upper straightening roller further comprises upper straightening roller extensions extending from the upper straightening roller body at both ends of the axis, and the lower straightening roller further comprises lower straightening roller extensions extending from the lower straightening roller body at both ends of the axis. The rolled workpiece is elongated and, during straightening operations, is positioned between the upper and lower straightening roller bodies. When the concave curvature of the upper straightening roller body matches the convex curvature of the lower straightening roller body, a gap is left to accommodate the rolled workpiece. This special upper and lower straightening roller shape design can increase the contact area between the straightening roller and the rolled piece, making the straightening force distribution more even, avoiding excessive local deformation of the rolled piece, and at the same time pre-bending the rolled piece, which is beneficial to eliminate residual stress, thereby improving straightening accuracy and efficiency and reducing surface damage to the rolled piece.

[0018] Preferably, a bearing is provided on the extension section of the upper straightening roller. This design makes it easier to install the upper straightening roller on the frame, and the bearing support reduces friction resistance, allowing the upper straightening roller to rotate more flexibly, thereby improving straightening efficiency and accuracy.

[0019] Preferably, the inclination of the upper straightening roller is adjustable. By adjusting the inclination of the upper straightening roller, the distribution of the straightening force across the cross-section of the workpiece can be varied, thereby enabling precise straightening for varying bending conditions. For example, greater straightening force can be applied to the edges or center of the workpiece, improving straightening accuracy.

[0020] Preferably, the lower straightening roller is connected to a motor as the active roller. During operation, the lower straightening roller rotates, driving the upper straightening roller. This transmission method, with the lower roller active and the upper roller driven, offers a simple structure and higher transmission efficiency. The rotation of the lower roller drives the workpiece forward, facilitating coordination with the feeding mechanism for continuous straightening.

[0021] To sum up, the two-roller straightening device of the utility model increases the contact area and optimizes the distribution of the straightening force by adopting the upper and lower straightening roller structures with matching concave and convex parts. At the same time, combined with the design of active lower roller and adjustable inclination of upper roller, it can effectively solve the problems of low straightening accuracy, low efficiency, and easy damage to the surface of rolled products in the existing technology, and achieve efficient, accurate and safe straightening effects. It is particularly suitable for straightening long strip rolled products. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 , which is a schematic structural diagram of a two-roller straightening device according to one embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings.

[0024] Figure 1 , is a schematic structural diagram of a two-roller straightening device according to an embodiment of the present invention. Figure 1 As shown, the utility model provides a two-roller straightening device, which is mainly used for straightening long strip rolled pieces 1, and includes an external frame (not shown in the figure), an upper straightening roller 2 and a lower straightening roller 4 arranged on the frame.

[0025] The upper straightening roller 2 and the lower straightening roller 4 each include a main body for straightening the rolled piece 1 and extension sections extending from both ends of the main body. The extension sections are used to mount bearings 5 ​​and are connected to the frame.

[0026] The upper straightening roller 2 comprises a concave cylindrical main body 2a, with a larger diameter in the middle than at the ends, forming an arc-shaped structure with a slightly concave center. Extending from both ends of the upper straightening roller main body 2a are upper straightening roller extensions 2b, each with a smaller diameter than the main body 2a. This stepped structure reduces weight and facilitates bearing installation.

[0027] The lower straightening roller 4 comprises a convex cylindrical body 4a. Its central diameter is smaller than its two ends, forming a slightly convex arc-shaped structure. Extending from both ends of the lower straightening roller body 4a are lower straightening roller extensions 4b, each with a smaller diameter than the lower straightening roller body 4a.

[0028] The concave curvature of the upper straightening roller body 2a matches the convex curvature of the lower straightening roller body 4a, leaving a gap between the two to accommodate the workpiece 1. The size of this gap can be adjusted according to the diameter of the workpiece 1. This concave-convex matching design ensures that when the workpiece enters the straightening area, it first contacts the convex curved surface of the lower straightening roller body 4a, achieving initial bending guidance, and then enters between the upper and lower straightening roller bodies 2a and 4a for more precise straightening.

[0029] The rolled piece 1 is in the shape of an elongated strip. During the straightening operation, the rolled piece 1 is located between the upper straightening roller body 2a and the lower straightening roller body 4a.

[0030] The upper straightening roller extension 2b is provided with a bearing 5, which is mounted in a bearing seat (not shown) on the frame 6. This bearing 5 supports the upper straightening roller 2 on the frame 6 and enables it to rotate flexibly. The presence of the bearing 5 greatly reduces rotational resistance, allowing the upper straightening roller 2 to more smoothly follow the rotation of the lower straightening roller 4, ensuring a smooth straightening process.

[0031] The inclination of the upper straightening roller 2 is adjustable, and an adjustment mechanism (not shown) allows for fine-tuning around its axis, for example, within a ±5° adjustment range. This allows for adjustments in the direction of the straightening force, enabling precise straightening of different parts of the workpiece 1. For example, if the degree of curvature of the workpiece 1 varies across different parts, the inclination of the upper straightening roller 2 can be adjusted to apply a greater straightening force to the more curved parts, resulting in more precise straightening.

[0032] The lower straightening roller 4 is connected to a motor (not shown) and serves as the active roller. During operation, the rotation of the lower straightening roller 4 drives the rotation of the upper straightening roller 2, thereby straightening the workpiece 1. Selecting the lower straightening roller 4 as the active roller can more conveniently drive the workpiece 1 forward, facilitate cooperation with the feeding mechanism, and achieve continuous straightening.

[0033] Working Principle: During operation, a long workpiece 1 to be straightened is fed between the upper straightening roller 2 and the lower straightening roller 4. The lower straightening roller 4 is driven by a motor, moving the workpiece 1 forward and, through friction, rotating the upper straightening roller 2. The workpiece 1 is repeatedly bent and unbent between the upper and lower straightening rollers 2 and 4, gradually eliminating internal stress and ultimately achieving the desired straightening effect.

[0034] Improve straightening accuracy and efficiency: The upper straightening roller body 2a adopts a concave cylindrical design, and the lower straightening roller body 4a adopts a convex cylindrical design, and a gap is left to match them, which increases the contact area between the straightening roller and the workpiece 1, makes the straightening force distribution more uniform, avoids excessive local deformation of the workpiece 1, and improves the straightening accuracy and efficiency.

[0035] Reduce the surface damage of the rolled piece: due to the uniform distribution of the straightening force, the concentrated pressure on the surface of the rolled piece 1 is reduced, and the risk of scratches, indentation and other damages on the surface of the rolled piece 1 is effectively reduced.

[0036] Realize accurate straightening: the inclination of the upper straightening roller 2 is adjustable, and different parts of the rolled piece 1 can be accurately straightened according to the bending condition of the rolled piece 1, for example, greater straightening force is applied to the edge or center part of the rolled piece 1, which further improves the straightening accuracy.

[0037] Simple structure and low cost: the two-roller straightening device of the utility model has simple structure, is easy to manufacture and maintain, and has low cost, and is suitable for popularization and application.

[0038] High transmission efficiency and convenient continuous production: the lower straightening roller 4 is used as a driving roller, directly drives the movement of the rolled piece 1, reduces the energy loss of the transmission link, and is convenient for cooperation with the feeding mechanism, which is beneficial to realize continuous straightening and improve the production efficiency.

[0039] The utility model is not limited to the above-mentioned embodiments, and various modifications, replacements and combinations of the above-mentioned embodiments can be made without departing from the spirit and scope of the utility model. For example, the concave-convex curvature of the upper and lower straightening roller bodies can be designed according to actual needs; the inclination adjusting mechanism of the upper straightening roller can adopt mechanical adjustment, hydraulic adjustment or pneumatic adjustment and various forms; the driving mode of the lower straightening roller can adopt gear transmission, chain transmission and various forms. The skilled in the art can select appropriate technical solutions according to actual needs.

[0040] In summary, the two-roller straightening device of the utility model has simple structure, low cost, good straightening effect, high efficiency and is not easy to damage the surface of the rolled piece, which can effectively solve the problems existing in the prior art, and has wide application prospect.

[0041] The above content is only the preferred embodiment of the utility model, and cannot limit the scope of the utility model, that is, any equivalent changes and modifications within the scope defined by the claims of the utility model shall still belong to the protection scope of the utility model.

Claims

1. A two-roller straightening device comprising a frame and an upper straightening roller (2) and a lower straightening roller (4) arranged on the frame, for straightening a long strip of rolled product (1), characterized in that: The upper straightening roller (2) comprises a concave cylindrical upper straightening roller body (2a), wherein the diameter of the roller body in the middle is larger than the diameters at both ends; the lower straightening roller (4) comprises a convex cylindrical lower straightening roller body (4a), wherein the diameter of the roller body in the middle is smaller than the diameters at both ends. The upper straightening roller (2) further comprises an upper straightening roller extension section (2b) extending from both ends of the upper straightening roller body (2a) along the axis. The lower straightening roller (4) further comprises lower straightening roller extension sections (4b) extending from both ends of the lower straightening roller body (4a) along the axis. The rolled piece (1) is in the shape of a long strip. During the straightening operation, the rolled piece (1) is located between the upper straightening roller body (2a) and the lower straightening roller body (4a). When the concave curvature of the upper straightening roller body (2a) matches the convex curvature of the lower straightening roller body (4a), a gap is left to accommodate the rolled piece (1).

2. The two-roller straightening device according to claim 1, characterized in that: A bearing (5) is provided on the upper straightening roller extension section (2b).

3. The two-roller straightening device according to claim 2, characterized in that: The inclination of the upper straightening roller (2) is adjustable.

4. The two-roller straightening device according to claim 3, characterized in that: The lower straightening roller (4) is connected to a motor as a driving roller. During operation, the lower straightening roller (4) rotates to drive the upper straightening roller (2) to rotate.

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