JP2006346713A - Thick plate rolling line providing inspection room - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exclude the possibility of overlooking surface flaws as much as possible, to make the guarantee of surface quality of a product of a thick plate to be delivered to a consumer more sure and to improve the operability and safety of an inspector. <P>SOLUTION: This thick plate rolling line is constituted so that the rear face of a material M to be rolled can be inspected visually by using a mirror 6 from an inspection room 3b on the underside of the material M and also the mirror 6 is made movable in the conveying direction of the material M. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a thick plate rolling line provided with a surface inspection chamber. In many cases, the thick plate refers to a thick steel plate, but other types of metals may be targeted.

  The thick steel plate is partially described in, for example, Non-Patent Document 1, although there is a hot-rolled steel strip (manufactured by a hot strip mill) and a region that wraps within the manufacturable plate thickness range. Thus, it refers to a steel sheet having a thickness in the range of 4.5 mm to 300 mm. In JIS, for example, among various steel plates and steel strips typified by the 3100 series, the steel plate direction is indicated. A hot-rolled steel strip manufactured by a hot strip mill is wound in a coil shape after finish rolling, whereas a thick steel plate is not wound.

  In plate rolling, a metal material is heated to several hundred to several hundreds of degrees Celsius, and then extracted onto a plate rolling line, and the roll is rotated thinly while being clamped by a pair or a plurality of pairs of rolls, and is thinly stretched. That means. FIG. 3 shows an example of a conventional thick plate rolling line 100. A metal material (rolled material) M having a thickness of 150 to 300 mm heated to several hundred to several hundreds of degrees Celsius by the heating furnace 20 is generally rolled several to twenty times in total by the rolling mill 22. The thickness is extended in and out of 4.5 to 300 mm.

  In the example of the thick plate rolling line 100 shown in FIG. 3, after the material M is rolled once (one pass) or a plurality of times by the rolling mill 22, the material M is rotated by 90 ° in a plane, followed. The rolling mill 22 performs rolling-out rolling to adjust to a substantially desired width by reciprocally rolling the material to be rolled M for several passes, and then, again, the material to be rolled M is rotated 90 ° in a plane, The rolling material 22 is adjusted to a substantially desired length by reciprocally rolling the material to be rolled M several times.

  Moreover, the scale material of the oxide has adhered to the surface layer of the to-be-rolled material M extracted by heating to several hundred to several hundreds of degreeC. In addition, since the rolled material M is exposed to the atmosphere at a high temperature even in the process of being rolled and thinned and lowered in temperature by heat radiation, a new scale is generated on the surface layer of the rolled material M. These scales are peeled off and removed by a high-pressure water jet in and out of 10 to 30 MPa as the supply pressure from the pump injected from the nozzle of the descaling device. Although not shown in FIG. 3, the descaling apparatus includes a descaling header attached to the entry side and the exit side of each rolling mill as viewed in the conveyance direction A of the material M, and a plurality of nozzles attached thereto. It consists of a pipe that leads to them and a pump that supplies water for a high-pressure water jet.

  The rolled material M that has finished rolling is air-cooled or water-cooled in the cooling zone 24, and is provided with desired mechanical properties (such as tensile strength).

  The material M to be rolled is air-cooled in the cooling bed 26.

  The rolled material M that has finished rolling may be flattened by being corrected in shape by the hot leveler 28, and after being air-cooled by the cooling bed 26, the order is not limited to the order described below, and passes through the whole. However, the width and length are measured by the measuring instrument 30, the leading end portion is cut by the crop shear 31, the wide end portion is cut by the side shear 32, the width is divided by the slitter 33, and the thickness is measured by the thickness meter 34. The measurement, the longitudinal division by the end shear 35, the shape (flatness) measurement by the flatness meter 36, the marking by the marking device 37, the marking by the stamping machine 38, and the like are appropriately performed. In addition to this, one or more of various refining processes such as cutting, correction, heat treatment, flaw detection, surface treatment, marking, etc. (not shown) may be provided according to the required specifications from customers. After the series of processing described above, the product is shipped.

  By the way, many (100 or more) table rollers 40 are installed in the thick plate rolling line 100, and the material M to be rolled is conveyed. Several table roller groups on the exit side of the rolling mill 22 are divided into two in the body length direction, and the material to be rolled M can be rotated in a 90 ° plane by reversing each other.

  In addition, although not shown, the control system is broadly divided into a control device and a process computer that calculates and sends a control target value to the control device, and a business that sends attribute data of the target material to be rolled to the process computer. Commands are sent from the computer to each device.

  Now, in the field of thick plate rolling, the surface quality of the material M to be rolled after rolling becomes very important.

In Patent Document 1, as shown in FIG. 4, the surface of a thick plate (rolled material) M is irradiated from the illumination light source 10 at a projection angle α of 20 to 40 °, and a light receiving angle of α ± 10 °. It is proposed that the image pickup device 15 picks up the surface of the thick plate M at β, and the image processing device 21 processes the image signal and the image output device 25 displays the image. Incidentally, in FIG. 4, 11 is a light projecting axis, 16 is a light receiving axis, and 18 is a polarizing filter.
“Technology Course Correspondence Education, Introduction to Thick Plates”, 2nd revised edition, Institute of Steelmaking, College of Industrial Technology, Human Resources Development Center, June 1994, p1-2 JP 2002-303582 A

  Although the method described in Patent Document 1 is an epoch-making attempt in finding a surface defect of a thick plate with an automatic system, it is still under development, so there are problems such as measures for disturbance and the environment. Many.

  The present invention eliminates the possibility of missing a surface defect as much as possible while relying on a human system, not an automatic system, and intends to assure the surface quality of the plate product delivered to the customer more reliably. In addition, the workability and safety of the inspector are taken into consideration.

  That is, the present invention is a thick plate rolling line in which a surface inspection chamber is provided on the downstream side of the rolling mill in the thick plate rolling line, the inspection chamber being located above and below the material to be rolled. From the inspection room below the rolled material, it is configured so that the back surface of the rolled material can be visually inspected using a mirror, and the mirror is movable in the conveying direction of the rolled material. Features.

  Further, the present invention is characterized in that the mirror can be moved in a plane in a direction perpendicular to the conveying direction of the material to be rolled.

  According to the present invention, the possibility of missing a surface defect is eliminated as much as possible, the surface quality of the thick plate product delivered to the customer is more reliably guaranteed, and the workability and safety of the inspector can be improved.

  In the present invention, in the example of the thick plate rolling line 100 shown in FIG. 3, the inspection room may be installed anywhere as long as a space can be secured as long as it is downstream of the rolling mill 22. For example, it may be downstream of the rolling mill 22 within the range shown in FIG. 3, or various types of cutting, correction, heat treatment, flaw detection, surface treatment, marking, etc., not shown in FIG. It may be in the middle of a line (not necessarily in a straight line) toward the finishing process. In addition, the inspection room is not provided in the middle of the existing equipment, but the existing equipment (for example, the cooling zone 24, the hot leveler 28, etc.) is moved in the transport direction of the material M to be rolled and installed in an empty space. Also good.

  In the present embodiment, the case where the inspection room 3 is installed immediately downstream of the stamp 38 will be described as an example. FIG. 1 shows an enlarged view of a portion where an inspection room is provided in the thick plate rolling line of the present invention. In the present invention, the inspection chamber 3 is conveyed on the thick plate rolling line 100. The mirror 6 is configured so that the back surface of the material M to be rolled can be visually inspected using the mirror 6 from the inspection chamber 3b below the material M to be rolled. The material to be rolled M is movable in the conveying direction.

  Further, as shown in a plan view in FIG. 2, the mirror 6 may be movable in a plane also in the direction B perpendicular to the conveying direction A of the material M to be rolled.

  In FIG. 1, 7 is a cart, and 8 is a rail. This is a mechanism for mounting the mirror 6 and moving in the transport direction A of the material M to be rolled.

  1 and 2, the movement of the mirror 6 in the conveyance direction A of the material M to be rolled or the planar movement in the direction B perpendicular to the conveyance direction A of the material M to be rolled is performed on the rail 8. The embodiment of the present invention is not limited to the traveling carriage 7 as long as it has an equivalent function such as a hydraulic cylinder moving on a linear way. The present invention is not limited to the above embodiment.

  In addition, one or a plurality of illumination light sources 10 may be installed. The tilt angle of the mirror 6 may be adjusted as appropriate.

  In FIG. 1, 5 is not directly related to the present invention, but is a stopper. In FIG. 3, which is an overall view of the above-described thick plate rolling line 100, marking and stamping are performed by the marking device 37 and the stamping machine 38. It is for positioning the end of the material M to be engraved on the conveying direction A side. In FIG. 1, the member on the hook installed at the upper end rotates by rotating around the fulcrum. It is a mechanism that protrudes on the line and abuts the other end in this state.

  In addition, two or three or more inspectors 3c are arranged in the examination room 3, and at least one inspector 3c is arranged in both the upper examination room 3a and the lower examination room 3b. .

  Usually, both the inspector 3c disposed in the upper inspection chamber 3a and the inspector 3c disposed in the lower inspection chamber 3b inspect the material M to be conveyed at 10 to 90 mpm to detect surface defects. When the surface defect is generated by the inspector 3c arranged in the lower inspection chamber 3b, that is, when a surface defect has occurred on the back surface of the rolled material M, the conveyance of the rolled material M is stopped. The inspector 3c arranged in the lower inspection chamber 3b goes out of the lower inspection chamber 3b, approaches the material M to be rolled, and directly inspects the material M to be rolled.

  The distance d between the inspection room 3b and the mirror 6 in FIG. 1 is set to 500 mm inside and outside (200 mm to 800 mm) when the inspector 3c is inspecting in the inspection room 3b. When exiting from the inspection room 3b, the space is small and there is a problem in terms of safety of the inspector 3c. Therefore, the mirror 6 is moved to the conveyance direction entrance side of the material to be rolled M (just opposite to A). . As a result, the surface quality of the thick plate product is more reliably guaranteed, and the workability and safety of the inspector 3c are also improved.

  In addition, as shown in a plan view in FIG. 2, if the mirror 6 can be moved in a plane in the direction B perpendicular to the conveyance direction A of the material M to be rolled, the workability and safety of the inspector 3c are similarly improved. It is preferable in terms of securing, or has an advantage that the mirror 6 is easy to work when performing maintenance such as cleaning or replacement.

  The size of the mirror 6 is the maximum width of the rolled material M that can be rolled by the thick plate rolling line 100 in the width direction (direction B in FIG. 2) of the rolled material being conveyed. However, the mirror 6 is also moved in a plane in the direction B perpendicular to the conveying direction A of the material M to be rolled. If it is possible, the size is not necessarily so large, for example, 500 to 1000 mm. When standing in a direction perpendicular to A and B, that is, in the longitudinal direction, it is preferable to have dimensions of 500 to 2000 mm.

  By the way, when the inspector 3c arranged in the upper inspection room 3a finds a surface defect, that is, when a surface defect has occurred on the surface of the material M to be rolled, the conveyance of the material M to be rolled is stopped, An inspector 3c arranged in the upper inspection chamber 3a goes out of the upper inspection chamber 3a, approaches the material M to be rolled, and directly inspects the material M to be rolled. It may get on the material M to be rolled.

It is a figure for demonstrating embodiment of this invention. It is a figure for demonstrating embodiment of this invention. It is a figure for demonstrating an example of the thick plate rolling line to which this invention is applied. It is a figure for demonstrating a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Thick plate rolling line 3 Inspection room 3a Upper inspection room 3b Lower inspection room 3c Inspector 5 Stopper 6 Mirror 7 Carriage 8 Rail 10 Illumination light source 11 Light projection axis 15 Imaging device 16 Light reception axis 18 Polarizing filter 20 Heating furnace 22 Rolling machine 24 Cooling zone 26 Cooling bed 28 Hot leveler 30 Measuring instrument 31 Crop shear 32 Side shear 33 Slitter 34 Thickness gauge 35 End shear 36 Flatness meter 37 Marking device 38 Marking machine 40 Table roller A Conveying direction B Right angle M Covered Rolled material

Claims (2)

  A thick plate rolling line in which a surface inspection chamber is provided on the downstream side of the rolling mill in the thick plate rolling line, the inspection chamber being located above and below the material to be conveyed and below the material to be rolled From the inspection room, it is configured so that the back surface of the material to be rolled can be visually inspected using a mirror, and the mirror is movable in the conveying direction of the material to be rolled. Thick plate rolling line with a chamber.   2. The thick plate rolling line provided with a surface inspection chamber according to claim 1, wherein the mirror can be moved in a plane in a direction perpendicular to the conveying direction of the material to be rolled.

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