On-line finishing device and method for rod and wire rolling mill

Abstract

The invention relates to the technical field of metallurgy finishing automation, in particular to an online finishing device of a rod and wire rolling mill. The invention aims to provide a device suitable for realizing online finishing on an existing rod and wire production line to solve the problems that the existing rod and wire production line is high in rolling speed and difficult in mounting position, and online finishing cannot be realized due to factors such as torsion and high temperature of rolled metal in the rolling process.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical finishing automation, in particular to an online finishing device for a bar and wire rolling mill. Background Art

[0002] The rolling process of bars and wire rods requires qualified raw materials, meaning they must be free of surface and internal defects, otherwise they will result in defective or substandard products. Traditional bar and wire rod mills have no means of addressing surface and internal defects during the rolling process, leaving much less room for remediation after rolling. For example, in the steel rolling process, raw materials must pass surface and internal quality inspections before being sent to the rolling process. Unqualified ingots must undergo finishing treatment before being sent to the rolling mill. However, even if internal quality issues are detected, there's no way to address them, let alone remove them with minimal removal. These are challenges the bar and wire rod press working industry has long sought to address. Patent application number 201910377287.2 of “An Online Robotic Finishing Platform for a Rolling Mill and Extension Line” discloses an online finishing solution for a rolling mill. However, for the bar and wire production line, the rolling speed is fast and the installation position is difficult. More importantly, the rolled material also produces torsion and offset during the rolling process. That is, after the defect is detected online, the rolled material has both axial movement and twisting and rotation. By the time the defect moves to the position of the finishing equipment, it has already rotated and offset, making it impossible to accurately calculate the defect rotation angle and the offset position. Because it is a high-temperature rolling process and requires high detection accuracy, technical personnel in this field believe that it is impossible to achieve online precise finishing on a bar and wire rolling line. This problem is a problem that the steel industry has always hoped to solve. Summary of the Invention

[0003] The purpose of the present invention is to provide a device for achieving online finishing on a bar and wire production line and a method for implementing online finishing in order to address the problems that online precise finishing cannot be achieved due to factors such as high rolling speed, difficult installation position, torsion, offset, and high temperature of the rolled material during rolling, etc.

[0004] The technical solution of the present invention is: an online finishing device for a bar and wire rod mill, characterized by comprising: a billet or material surface defect detection instrument installed on the bar and wire rod mill, a billet or material finishing device, a torsion angle detection device, and a computer detection and control device. The torsion angle detection device is a detection instrument for measuring the surface profile or partial surface profile of the billet or material, or an instrument for measuring the position of the billet or material; the surface defect detection instrument and the billet or material finishing device are installed in the area between two adjacent stands on the bar and wire rod mill, and the torsion angle detection device is installed in the area between the two adjacent stands, including the stands of these two mills; or the surface defect detection instrument and the billet or material finishing device are installed in the area between the roughing mill exit and the continuous rolling mill entrance, and the torsion angle detection device is installed in the billet or material finishing device area or the surface defect detection instrument; the surface defect detection instrument, the billet or material finishing device, and the torsion angle detection device are interconnected with the computer detection and control device to achieve real-time detection of defect positions by image, real-time and accurate determination of defect positions, and real-time control of finishing defect processing.

[0005] The online finishing device of a bar and wire rolling mill as described above is characterized in that a displacement or speed detection instrument for detecting the axial movement of the billet or rolled material is installed in the surface defect detection instrument area or the finishing device area of ​​the rolling line, and the displacement or speed detection instrument is connected to a computer detection and control device.

[0006] The online finishing device of a bar and wire rolling mill as described above is characterized in that there are multiple detection instruments for detecting the surface profile or partial surface profile and profile position of the billet or rolled material, which are used to measure the surface profile or partial surface profile and profile position of the billet or rolled material at multiple locations. Based on the measured profile of each section and the deviation position of each section of the profile from the axis, the computer can calculate the rotation angle and offset distance of the surface or profile of the billet or rolled material from the surface detection position to the finishing processing position.

[0007] The online finishing device for a bar and wire rolling mill as described above is characterized in that the rolling speed of the bar and wire rolling mill is very fast and defects may appear at any direction of the rolled material. In order to respond quickly, the finishing device includes multiple finishing arms distributed around the rolling mill to quickly handle any defects that occur.

[0008] The online finishing device for a rod and wire rolling mill as described above is characterized in that the finishing arm of the billet or material finishing device is composed of a flexible actuator. When the finishing arm is supported by a flexible structure, a spring connection or a pneumatic structure support can be selected to cushion the impact generated during processing.

[0009] The online finishing device for a bar and wire rolling mill as described above is characterized in that: the billet finishing device has a base for driving the finishing tool arm to move, and the base's running track is parallel to the billet or rolled material surface, or parallel to the moving direction of the rolled material.

[0010] The online finishing device for a rod and wire rolling mill as described above is characterized in that the moving surface of the finishing tool arm is perpendicular to the surface to be processed, and the processing surface of the finishing tool head is parallel to the processed surface of the rolled billet.

[0011] The above-mentioned online finishing device for a bar and wire rolling mill is characterized in that the tools of the rolling mill finishing device include milling and pin turning tools, grinding wheels or other melting finishing tools.

[0012] The present invention also provides a method for online finishing of a bar and wire rolling mill, which is characterized by comprising the following steps: Determine the positions of surface defect detection instruments, slab or rolled material finishing devices, and torsion angle detection devices on the rolling line; use slab or rolled material surface defect detection instruments installed on the bar or wire rod rolling mill line to detect surface defects of the slab or rolled material and correlate them with the length of the slab or rolled material; The surface profile and profile position deviation of the slab or rolled product are measured by a torsion angle detection device installed on a bar or wire rod rolling mill line and correlated with the length of the slab or rolled product; Determine the relationship between surface defects, torsional deformation and length of the billet or rolled material by using displacement or speed detection instruments installed on the bar or wire rolling mill line that detect the axial movement of the billet or rolled material, or calculate the length relationship by using the speed of the rolling mill rolls; Use displacement or speed detection instruments to determine the relationship between the finishing device and the position of the billet or rolled material, or use the speed of the rolling mill rolls to calculate the length; The surface defect detection instrument, the rolling or rolled material slab finishing device, the torsion angle detection device, the length calculation value and the computer detection and control device are interconnected to realize the real-time detection of the defect position by the image, the real-time and accurate determination of the defect position, the accurate determination of the relative position between the finishing device and the rolling slab or rolled material, the accurate determination of the relative position between the finishing device and the surface defects of the rolling slab or rolled material, and the accurate control of the finishing process defects; The signals connected to the computer include instructions for turning the rolling mill or the rolled material billet, thereby determining the direction in which the rolling mill billet or the rolled material is placed on the roller table.

[0013] The online finishing method for a bar and wire rolling mill as described above is characterized in that the displacement or speed detection instruments for detecting the movement of the billet or rolled material include instruments along the axial direction and other directions of the billet or rolled material, and there are multiple displacement or speed instruments for detecting the surface quality of the billet or rolled material and the correlation between the head, tail, length and torsional deformation of the billet or rolled material.

[0014] Compared to bar and wire production processes without online finishing, this method offers the following advantages: It can significantly improve the bar and wire qualification rate. In particular, for billet hot charging, precise hot delivery, or direct rolling processes, it can significantly improve the final product qualification rate without affecting the hot delivery and hot charging temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the online finishing between the roughing mill outlet and the intermediate mill inlet of a high-speed bar and wire rod rolling line according to the present invention.

[0016] Figure 2 For the present invention Figure 1 Schematic diagram of measurement and calculation along the axial direction of rods and wires.

[0017] Figure 3 For the present invention Figure 1 Schematic diagram of online finishing along the axial direction of rods and wires.

[0018] Figure 4 This is a schematic diagram of the online finishing of high-speed bars and wires between the outlet of the roughing mill and the inlet of the intermediate rolling mill according to the present invention.

[0019] Figure 5 This is a schematic diagram of the present invention for implementing online finishing between the roughing mill outlet and the continuous rolling mill inlet for a large bar and wire rod rolling line.

[0020] The numbers in the accompanying drawings are: 1 is the end vertical roller at the outlet of the roughing mill, 2 is the flat roller at the entrance of the intermediate rolling mill, 3 is the bar and wire rod billet, 4 is the cross-sectional profile of the billet when rolled by the end vertical roller at the outlet of the roughing mill, 5 is the cross-sectional profile of the billet when it moves to position A, 6 is the cross-sectional profile of the billet when it moves to position B, 7 is the plane of the billet rolled by the vertical roller of the roughing mill, 8 is a laser rangefinder, θ is the torsion angle between section 5 or 6 and section 4, 9-1, 9-2, 9-3, 9-4 are finishing tools, 10-1, 10-2, 10-3, 10-4 are moving surfaces of the finishing arm base, 11 guide wheel, 12 milling cutter moving arm, 13, 13-1, 13-2 milling tools, 14-1, 14-2 instruments for detecting axial displacement of billets or rolled materials, 15 roller table, 16 surface defect detection instrument. Specific implementation plan

[0021] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several variations and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0022] Figure 1This is a schematic diagram of the present invention for the online finishing of high-speed bar and wire rod between the roughing mill exit and the intermediate mill entrance. For the sake of clarity, the flying shear, surface inspection instrument, and finishing equipment are not drawn in the figure. The schematic diagram is a typical layout from the roughing mill exit to the intermediate mill entrance on a high-speed bar and wire rod rolling line. The bar and wire rod 3 is rolled out from the vertical roll 1 of the roughing mill, passes through the flying shear head, and enters the flat roll 2 entrance of the intermediate mill. At the same time, torsion and deviation are generated. Figure 1 It is quite special because the profile and position of the rolling roller 1 remain unchanged, which is equivalent to having a set of instruments for measuring profile and profile position. Only another set of measuring instruments 5 is needed to continuously detect the profile and profile position to calculate the torsion angle and offset position of the rolling blank or rolled material when it moves from position A to B.

[0023] Figure 2 This is a schematic diagram of the measurement and calculation along the axial direction of the rod and wire according to the present invention. In the figure: the dotted box Figure 4 yes Figure 1 The rolling surface 4 in the figure is the profile of the billet at the exit of the roughing vertical roll 1. The solid line frame 5 or 6 is Figure 1 The outline of the billet at point A or point B is shown in the figure. 8 is a length measuring instrument for detecting the outline, which can be measured with a laser instrument. The inclination of the roughing vertical roller can be detected before normal production. During production, only the plane of the side of the billet needs to be detected ( Figure 1 7) The inclination angle, angle θ is the torsion angle, and the billet distance L is also measured. Since the distance between the two rolling mill stands is very close, the torsion angle per unit length can be measured and calculated, and the offset per unit length can also be calculated. In turn, the torsion angle and offset position of the rolled material moving from the defect detection position A to the finishing position B can be accurately calculated, thereby accurately calculating the direction of the defect moving to the finishing position.

[0024] Figure 3 The figure shows the in-line finishing of the rod and wire along the axial direction of the present invention. In the figure, the base moving surfaces 10-2 and 10-4 of the milling cutter arms 9-2 and 9-4 are parallel to the corresponding processing surfaces, and the axial moving surfaces 10-1 and 10-3 of the bases of the milling cutter arms 9-1 and 9-3 are parallel to the axial direction of the rolled billet.

[0025] Figure 4 This diagram illustrates the in-line finishing of high-speed bar and wire rod between the roughing mill exit and the intermediate mill entrance according to the present invention. In the diagram, the machining surface of the finishing tool head, including that of the milling cutter 13, is parallel to the workpiece surface of the billet; the feed plane of the milling cutter arm 12 is also perpendicular to the machining surface. The milling cutter arm 12 can rotate rapidly to move the milling cutter, adapting to the rapid movement of the billet. The milling cutter arm 12 is resilient to cushion impact during milling.

[0026] Figure 5This is a schematic top view of a portion of the roller conveyor of the large bar rolling line according to the present invention. The billet moves on the roller conveyor in the area between the roughing mill exit and the continuous rolling mill entrance. In the finishing area, there are multiple sets of finishing milling cutters to facilitate the treatment of multiple defects. Figure 1 Unlike the slab, which moves relatively freely on the track and may experience overall deflection and oscillation, at least two sets of measuring instruments are sometimes required to determine the torsion and deflection of the slab as it moves from the surface defect detection position to the finishing position. The figure shows two sets of displacement measuring instruments 14-1 and 14-2. If the slab undergoes horizontal rotational oscillation at the measurement point of measuring instrument 14-1 (the dotted line represents the position of the slab after the rotational oscillation), even though the profile and position at 14-1 remain unchanged, the oscillation can be detected at instrument 14-2, allowing accurate calculation of the slab's torsion and deflection at the finishing position and the position change of milling cutter 13-1.

[0027] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above-described embodiment. The rolled material of the present invention is not limited to steel materials but is also applicable to other metal materials. All technical solutions that fall within the scope of protection of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, modifications or partial equivalent replacements that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An online finishing device for a bar and wire rolling mill, characterized by: The system comprises a billet or material surface defect detection instrument, a billet or material finishing device, a torsion angle detection device, and a computer detection and control device installed on a bar or wire rod rolling mill. The torsion angle detection device is a detection instrument for measuring the surface profile or partial surface profile of a billet or material, or an instrument for measuring the position of the billet or material profile. The surface defect detection instrument and the billet or material finishing device are installed in the area between two adjacent stands on the bar or wire rod rolling mill, while the torsion angle detection device is installed in the area between two adjacent stands, including the stands of these two mills. Alternatively, the surface defect detection instrument and the billet or material finishing device are installed in the area between the roughing mill exit and the continuous rolling mill entrance. The torsion angle detection device is installed in the billet or material finishing device area or the surface defect detection instrument area. The surface defect detection instrument, the billet or material finishing device, and the torsion angle detection device are interconnected with the computer detection and control device to achieve real-time detection of defect positions by image, real-time and accurate determination of defect positions, and real-time control of defect finishing.

2. The online finishing device for a bar and wire rolling mill according to claim 1, characterized in that: A displacement or speed detection instrument for detecting the axial movement of the billet is installed in the surface defect detection instrument area or finishing area of ​​the rolling line. The displacement or speed detection instrument is connected to a computer detection control device.

3. The online finishing device for a bar and wire rolling mill according to claim 1, characterized in that: There are multiple detection instruments for detecting the surface contour or partial surface contour and position, which are used to measure the surface contour or partial surface contour and position of the rolling stock or rolled material at multiple locations. Based on the measured contour of each segment and the deviation position of each segment contour from the axis, the computer can calculate the torsion angle and offset distance of the rolling stock or rolled material moving from the detection point of the surface detection instrument to the finishing processing position.

4. The online finishing device for a bar and wire rolling mill according to claim 1, characterized in that: The slab or rolled stock finishing device includes multiple finishing arms to handle defects.

5. The online finishing device for a bar and wire rolling mill according to claim 1, characterized in that: The finishing arm of the rolling mill or rolled material finishing device is composed of a flexible actuator. When the finishing arm is supported by a flexible structure, a spring connection or a pneumatic structure support can be selected.

6. The online finishing device for a bar and wire rolling mill according to claim 1, characterized in that: The slab finishing device is provided with a base that drives the finishing tool arm to move, and the base's running track is parallel to the slab or rolled material surface, or parallel to the slab moving direction.

7. The online finishing device for a bar and wire rolling mill according to claim 1, characterized in that: The moving surface of the finishing tool arm is perpendicular to the surface to be processed, and the processing surface of the finishing tool head is parallel to the processed surface of the rolled billet.

8. The online finishing device for a bar and wire rolling mill according to claim 1, characterized in that: The rolling mill finishing device includes milling tools, turning tools, grinding wheels or other fusion finishing tools.

9. An online finishing method for a bar and wire rolling mill, characterized in that: The following steps are involved: Determine the positions of surface defect detection instruments, slab or rolled material finishing devices, and torsion angle detection devices on the rolling line; use slab or rolled material surface defect detection instruments installed on the bar or wire rod rolling mill line to detect surface defects of the slab or rolled material and correlate them with the length of the slab or rolled material; The surface profile and profile position deviation of the slab or rolled product are measured by a torsion angle detection device installed on a bar or wire rod rolling mill line and correlated with the length of the slab or rolled product; Determine the relationship between surface defects or torsional deformation of the billet or rolled material and its length by using displacement or speed detection instruments installed on the bar or wire mill line to detect the axial movement of the billet or rolled material, or calculate the length relationship by using the speed of the mill rolls; Use displacement or speed detection instruments to determine the relationship between the finishing device and the position of the billet or rolled material, or use the speed of the rolling mill rolls to calculate the length; The surface defect detection instrument, the billet or rolled material finishing device, the torsion angle detection device, the length calculation value and the computer detection and control device are interconnected to realize real-time detection of defect positions by images, real-time and accurate determination of defect positions, accurate determination of the relative positions of the finishing device and the billet or rolled material, accurate determination of the relative positions of the finishing device and the surface defects of the billet or rolled material, and accurate control of finishing process defects; The signals connected to the computer include instructions for rolling or turning the rolled material.

10. The online finishing method for a bar and wire rolling mill according to claim 9, characterized in that: The displacement or speed detection instruments for detecting the movement of the billet or rolled material include instruments along the axial direction and other directions of the billet or rolled material. There are multiple displacement or speed instruments, which are used to associate the detected surface quality of the billet or rolled material with the head, tail, length and torsional deformation of the billet or rolled material.

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