Device for measuring warping degree of hot rolled strip steel
By designing a device for measuring width and depth, the problem of measuring the warp of hot-rolled strip steel was solved, achieving efficient and accurate warp measurement and supporting the quantitative analysis of warp defects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BENXI NORTHERN STEEL ROLLING CO LTD
- Filing Date
- 2025-05-28
- Publication Date
- 2026-04-21
AI Technical Summary
Existing technologies cannot effectively measure the warp of hot-rolled strip steel, especially the flaring, which leads to deviations in the detection and control of strip shape defects and affects user experience.
A device comprising a width measuring ruler and a depth measuring ruler is designed. The width measuring ruler and the depth measuring ruler are equipped with scales. The depth measuring ruler can slide and contact the warped inner surface of the strip. The warping degree is calculated by measuring the width and depth. The device can hold strips of different sizes. The depth measuring ruler can slide left and right and move up and down.
It improves the efficiency and accuracy of warpage measurement, enabling simultaneous measurement of the width and depth of warpage, providing quantitative data to support precise analysis, and quantifying the warpage defect status of strip steel.
Smart Images
Figure CN224151635U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of strip steel measurement technology in the steel industry, and in particular to a device for measuring the warpage of hot-rolled strip steel. Background Technology
[0002] Like thickness and width, strip shape is an important indicator for measuring the geometric dimensional accuracy of sheet and strip materials. In the hot rolling process, strip shape is more of a general term for cross-sectional shape and flatness. Considering the essential mechanisms and interrelationships of various defects, cross-sectional shape defects, flatness defects, warping, camber, etc., are collectively referred to as strip shape defects. During the production process of hot-rolled strip steel, the shape and flatness of the strip at the exit are detected by an F7 exit flatness tester to determine whether key parameters such as flatness, convexity, wedge shape, and edge drop meet the standard requirements.
[0003] The shape control of hot-rolled strip steel mainly involves controlling the strip's crown, that is, controlling the metal flow by utilizing the deformation of the strip during the rolling process. The flatness and crown indicators are fed back by a multi-functional instrument at the finishing mill exit. Released coils are judged by curve analysis to determine whether they meet standard requirements. However, after being uncoiled at the user's location, severe shape defects such as warping, single-sided wavy lines, double-sided wavy lines, and central wavy lines are found, seriously affecting the user's use. Analysis shows that the shape defects are caused by residual stress, which leads to poor shape. These defects are further divided into "potential" and "apparent" shape defects. Any residual internal stress within the strip is considered a shape defect. If this stress exists but is insufficient to cause warping, it is called a potential shape defect; if the stress is large enough to cause warping, it is called an apparent shape defect. When thin strips have residual internal stress, if this stress reaches a limit value, it easily forms visible shape defects such as warping, wavy lines, and other defects.
[0004] In actual hot-rolled strip steel production, shape control is quite complex because the control process takes place during high-temperature rolling, while the control target is the strip shape at room temperature. This leads to a discrepancy between the control process monitoring and the final result. This is because, in hot-rolled production, strip steel must undergo controlled cooling, coiling, and cooling storage after rolling to achieve the required mechanical properties, microstructure, and grain size. Therefore, during the post-rolling cooling process, the stress distribution within the strip steel changes significantly, affecting the residual stress distribution and thus the final shape of the hot-rolled strip steel. While edge waviness can be measured by placing the strip steel on a platform and measuring the waviness height with a ruler to indicate its severity, curvature cannot be directly measured. It requires measuring the strip width and the depth of curvature to calculate the curvature, and currently, there are no readily available tools for this measurement. Utility Model Content
[0005] To address the aforementioned technical problems, a device for measuring the warpage of hot-rolled strip steel is provided. The technical means employed in this invention are as follows:
[0006] A device for measuring the warpage of hot-rolled strip steel includes: a width measuring ruler and a depth measuring ruler, both of which are provided with graduations. A first baffle is fixedly connected to one end of the width measuring ruler, and a second baffle is slidably connected to the width measuring ruler. The second baffle slides left and right on the width measuring ruler. The first baffle is used to clamp onto one side of the strip steel, and the second baffle is used to clamp onto the other side of the strip steel.
[0007] The depth gauge is slidably connected to the width gauge and located between the first baffle and the second baffle. The depth gauge is set perpendicularly to the width gauge and slides left and right on the width gauge. The depth gauge has a vertical movement function. The lower end of the depth gauge contacts the warped inner surface of the strip.
[0008] Furthermore, it also includes a first slider, the second baffle is fixedly connected to the first slider, and the first slider is slidably connected to the width measuring ruler.
[0009] Furthermore, it also includes a second slider, which is slidably connected to the width measuring ruler, and the depth measuring ruler is slidably connected to the second slider and moves up and down on the second slider.
[0010] Furthermore, the end of the depth gauge that contacts the strip steel has a tapered structure, and the tip of the tapered structure contacts the strip steel.
[0011] Furthermore, the maximum length range of the width measuring ruler is 1600mm.
[0012] Furthermore, the maximum length range of the depth gauge is 150mm.
[0013] Compared with the prior art, the present invention has the following advantages:
[0014] 1. The device for measuring the warpage of hot-rolled strip steel provided by this utility model improves the efficiency and accuracy of measuring the warpage width and warpage depth of hot-rolled strip steel, and provides data quantification support for accurately representing the degree of warpage of strip steel.
[0015] 2. The device for measuring the warpage of hot-rolled strip steel provided by this utility model can measure the specific values of the width and depth of the hot-rolled strip steel after warpage in one go. Then, the specific warpage value of the strip steel can be obtained by calculation, and the defect status of the strip steel after warpage can be quantitatively analyzed.
[0016] 3. The device for measuring the warpage of hot-rolled strip steel provided by this utility model can move on the measuring ruler by means of a second baffle, and can hold strip steel of various sizes after warping to measure the width of the strip steel.
[0017] 4. The device for measuring the warpage of hot-rolled strip steel provided by this utility model can measure bending deflection by sliding the depth gauge left and right and up and down.
[0018] Based on the above reasons, this utility model can be widely promoted in fields such as strip warpage measurement. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the steel strip accumulation in a specific embodiment of this utility model.
[0021] Figure 2 This is a schematic diagram illustrating the degree of warping in a specific embodiment of the present invention.
[0022] Figure 3 This is a schematic diagram of the warpage measuring device in a specific embodiment of this utility model.
[0023] In the diagram: 1. Width measuring ruler; 2. First baffle; 3. Second baffle; 4. Depth measuring ruler; 5. First slider; 6. Second slider. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0025] This invention provides a device for measuring the warpage of hot-rolled strip steel. It is designed for measuring the degree of warpage after hot-rolled coils are uncoiled following cooling in hot-rolling plants. The device measures both width and depth to calculate the warpage value. This invention allows for the simultaneous measurement of the width and depth of hot-rolled strip steel after warping, and the specific warpage value of the coil can be calculated, enabling quantitative analysis of the defect state after warping.
[0026] This utility model provides a device for measuring the warpage of hot-rolled strip steel, comprising: a width measuring ruler 1, a depth measuring ruler 4, a first slider 5, and a second slider 6. Both the width measuring ruler 1 and the depth measuring ruler 4 are provided with graduations. A first baffle 2 is fixedly connected to one end of the width measuring ruler 1, and a second baffle 3 is slidably connected to the width measuring ruler 1. The second baffle 3 is fixedly connected to the first slider 5, and the first slider 5 is slidably connected to the width measuring ruler 1. The second baffle 3 slides left and right on the width measuring ruler 1 via the first slider 5. The first baffle 2 is used to hold the strip steel on one side, and the second baffle 3 is used to hold the strip steel on the other side. That is, during measurement, the strip steel is held in place by moving the second baffle 3. The depth gauge 4 is slidably connected to the width gauge 1 and located between the first baffle 2 and the second baffle 3. The depth gauge 4 is slidably connected to the second slider 6, which moves up and down. The second slider 6 is slidably connected to the width gauge 1, which moves left and right. Thus, the depth gauge 4 can slide left and right on the width gauge 1 via the second slider 6, and its up and down movement is achieved through the sliding connection between the depth gauge 4 and the second slider 6. The depth gauge 4 is perpendicular to the width gauge 1, and its lower end contacts the warped inner surface of the strip. The end of the depth gauge 4 that contacts the strip has a tapered structure, with the tip of the tapered structure contacting the strip.
[0027] The specific design process is as follows:
[0028] 1. First, design a width measuring ruler. The width measuring ruler has specific graduations. One end is fixed, and the other end has a movable first slider that can move left and right according to different widths.
[0029] 2. Add a sliding, vertical depth gauge to the width measuring ruler. The depth gauge has specific graduations and is connected to the width measuring ruler with a fixed slider (second slider). The depth gauge can slide left and right and up and down.
[0030] The measurement process is as follows:
[0031] 1. To quantitatively represent the degree of transverse warpage of strip steel and facilitate transverse comparison of strips of different specifications, a concept of warpage, denoted by the symbol ζ, is proposed, and its expression is as follows: ζ represents warpage, and δ, B, and H represent the bending deflection of the strip in the width direction, the width of the strip after bending, and the thickness of the strip, respectively.
[0032] 2. First, measure the width B of the hot-rolled strip after bending. Slide the first slider on the width measuring ruler to the other end of the strip. The value on the width measuring ruler corresponding to the left side of the first slider is the bending width B. The maximum length range of the width measuring ruler is 1600mm.
[0033] 3. Move the second slider on the depth gauge left and right. The lowest point represents the bending depth of the steel plate. At this point, read the corresponding graduation on the depth gauge at the lower end of the width gauge; this is the bending deflection δ. The maximum length range of the depth gauge is 150mm.
[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A device for measuring the warpage of a hot rolled strip, characterized in that, include: Width measuring ruler (1) and depth measuring ruler (4) are provided with scales. One end of the width measuring ruler (1) is fixedly connected to a first baffle (2). A second baffle (3) is slidably connected to the width measuring ruler (1). The second baffle (3) slides left and right on the width measuring ruler (1). The first baffle (2) is used to clamp on one side of the strip steel, and the second baffle (3) is used to clamp on the other side of the strip steel. The depth gauge (4) is slidably connected to the width gauge (1) and located between the first baffle (2) and the second baffle (3). The depth gauge (4) is set perpendicularly to the width gauge (1) and slides left and right on the width gauge (1). The depth gauge (4) has the function of moving up and down. The lower end of the depth gauge (4) contacts the warped inner surface of the strip.
2. The apparatus for measuring the camber of a hot rolled strip as claimed in claim 1, wherein, It also includes a first slider (5), the second baffle (3) is fixedly connected to the first slider (5), and the first slider (5) is slidably connected to the width measuring ruler (1).
3. The apparatus for measuring the camber of a hot rolled strip as defined in claim 1 wherein, It also includes a second slider (6), which is slidably connected to the width measuring ruler (1), and the depth measuring ruler (4) is slidably connected to the second slider (6) and moves up and down on the second slider (6).
4. The apparatus for measuring the camber of a hot strip as defined in claim 1, wherein The end of the depth gauge (4) that contacts the strip steel is a conical structure, and the tip of the conical structure contacts the strip steel.
5. The apparatus for measuring the camber of a hot strip as defined in claim 1, wherein The maximum length range of the width measuring ruler (1) is 1600mm.
6. The apparatus for measuring the camber of a hot strip as defined in claim 1, wherein The maximum length range of the depth gauge (4) is 150 mm.