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WO1997027968A2 - Procede et appareil pour surveiller et inspecter le bord d'une bande - Google Patents

Procede et appareil pour surveiller et inspecter le bord d'une bande Download PDF

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Publication number
WO1997027968A2
WO1997027968A2 PCT/US1996/020643 US9620643W WO9727968A2 WO 1997027968 A2 WO1997027968 A2 WO 1997027968A2 US 9620643 W US9620643 W US 9620643W WO 9727968 A2 WO9727968 A2 WO 9727968A2
Authority
WO
WIPO (PCT)
Prior art keywords
edge
images
standard operating
operating parameter
shear angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1996/020643
Other languages
English (en)
Inventor
Albert R. Zelt, Iii
Robert M. Klawonn
Paul S. Laskey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz Asko Inc
Original Assignee
Asko Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/588,625 external-priority patent/US5857031A/en
Application filed by Asko Inc filed Critical Asko Inc
Priority to AU13499/97A priority Critical patent/AU1349997A/en
Publication of WO1997027968A2 publication Critical patent/WO1997027968A2/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D35/00—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools
    • B23D35/005—Adjusting the position of the cutting members
    • B23D35/007—Adjusting the position of the cutting members for circular cutting members

Definitions

  • the present invention relates generally to metal strip edge and, more particularly, to a method and apparatus for monitoring and inspecting in real time various characteristics of the strip edge.
  • Strip metal is a commodity that is commonly produced by the metals industry.
  • various operations must be performed on the metal strip before the strip can be processed into one or more final products.
  • Operations typically performed on metal strip include edge-trimming, slitting, shearing and stamping operations.
  • a slitting operation a wide, metal strip is cut into any suitable number of narrower strips.
  • an edge-trimming operation a metal strip of, usually, non-uniform width is trimmed to a desired width.
  • Slitting and edge-trimming operations are typically performed by rotary cutting knives mounted, respectively, above and below the strip at a desired location for cutting or trimming same. In the above-noted operations, new edges for the metal strip are produced thereby.
  • low-quality edges may subsequently crack or rust, or cause subsequent coating or welding problems, or reduce the "fit and finish ⁇ 1 of the strip, all of which results in increased processing costs and scrap rates.
  • the quality of the edge is usually dependent on the setting or positioning of the knives.
  • the upper knife can be adjusted vertically to create a desired amount of overlap with the lower knife.
  • the lower knife can be adjusted horizontally to adjust the amount of clearance between the upper and lower knives.
  • the knives are initially positioned and subsequently adjusted according to settings which, from empirical experience with strip of the same thickness and metallurgical composition, are thought to be correct.
  • the edges of strip produced by the knives are periodically manually and visually inspected to determine whether the knives are properly set and otherwise in good working order (e.g., the knife edges are sharp and defect- free) .
  • strip edge inspection has only been done periodically and not in real time, a number of strip metal coils may be processed before a problem with one or more of the knives is detected. This can lead to many of the strip metal coils being scrapped or reworked if the edge quality has become unacceptable.
  • the present invention provides a method and apparatus for monitoring and inspecting, in real time, various characteristics of strip edge that can be influenced by improper knife settings or worn or degraded knives.
  • the knives can be timely adjusted or replaced when they begin to operate outside of normal operating parameters, thereby preventing the unnecessary scrapping or subsequent re-working of the metal strip.
  • a method of monitoring and inspecting an edge of strip metal includes the following steps: providing at least one image producer having a field of view that substantially frames the edge; using the at least one image producer to form a first series of images of the edge after the edge has been formed by at least one knife; and analyzing in real time the first series of images to determine the shear angle of the edge.
  • the method of monitoring further includes the steps of: comparing the shear angle to a standard operating parameter for shear angle,* determining whether the shear angle is within the standard operating parameter; and alerting an operator if the shear angle is not within the standard operating parameter.
  • an apparatus for monitoring and inspecting an edge of strip metal includes at least one image producer having a field of view that substantially frames the edge.
  • the at least one image producer is operable to form a first series of images of the edge after the edge has been formed by at least one knife.
  • the apparatus includes an analyzer that is connectively associated with said at least one image producer. The analyzer is operable to determine in real time the shear angle of the edge and to compare the shear angle to a standard operating parameter for shear angle.
  • a method of monitoring and inspecting an edge of strip metal includes the following steps: providing at least one image producer having a field of view that substantially frames the edge; using the at least one image producer to form a first series of images of the edge after the edge has been formed by at least one knife; and analyzing in real time the first series of images to determine the burr height of the edge.
  • an apparatus for monitoring and inspecting an edge of strip metal includes at least one image producer having a field of view that substantially frames the edge.
  • the at least one image producer is operable to form a first series of images of the edge after the edge has been formed by at least one knife.
  • the apparatus includes an analyzer that is connectively associated with said at least one image producer.
  • the analyzer is operable in real time to determine the burr height of the edge and to compare the burr height to a standard operating parameter for burr height.
  • Figures la-lc are various operational views of a pair of rotary knives edge- rimming a metal strip.
  • Figure 2 is a schematic view of a first preferred embodiment of the present invention used to analyze the shear angle of a strip edge.
  • Figure 3 is a schematic view of a second preferred embodiment of the present invention used to analyze the burr height of a strip edge.
  • the present invention is described below in terms of an edge-trimming operation for metal strip.
  • apparatus and method of the present invention may be adapted for use in any suitable operation wherein metal or other strip is processed such that a strip edge is formed thereby.
  • Figures la-lc show a pair of rotary knives 10 in operational contact with a metal or other strip 12 to create a new edge 14 therefor. As shown, the knives 10 are positioned with respect to each other such that a horizontal clearance X is defined therebetween.
  • Each of the knives 10 is supported by a shaft 16 that is, in turn, mounted in a support block or arbor (not shown) by means of, for example, roller bearings.
  • the strip 12 is typically disposed between the support blocks and is fed between the knives 10.
  • the depth of penetration into the strip 12 is determined by the ultimate tensile strength of the strip material and its relationship to the yield strength and the thickness of the strip 12.
  • the quality of the edge 14 formed by the knives 10 can be affected by various conditions, including the relative positioning and operational characteristics of the knives 10, which are discussed in detail in a copending application (Our Docket No. 95-233) filed on January 5, 1996, the contents of which are hereby incorporated by reference. Therefore, by continuously monitoring in real time the quality of the edge 14 formed by the knives 10, an operator will be able to timely determine when an adjustment in the positioning of the knives 10 is required or when the knives 10 need to be replaced.
  • Edge quality can be monitored, for example, in terms of the burr 22 and the shear angle A of the edge 14 formed by the trimming process.
  • the shear angle A of a strip edge 14 is defined by the angle formed between the "nick" region 18 and the "break" region 20 of the edge 14.
  • the shear angle A should remain relatively constant within certain operating parameters, which usually have been empirically determined over time.
  • burrs 22 are formed on trimmed edges 14 by, among other things, excess shearing or fracturing pressure being exerted on the edges 14 by the knives 10. This excess pressure can be caused by incorrect or inaccurate horizontal and/or vertical positioning of the knives 10 with respect to one another and the strip 12.
  • Burrs 22 formed on strip edges 14 can cause safety and operational problems with the strip 12. For example, burrs 22 are often sharp and can consequently lacerate material handlers. In addition, depending on the application, many final products formed from the processed strip 12 cannot have large, or any, burrs thereon. Thus, if the burrs 22 are too large, or cannot be present at all on the strip edge 14, they must be subsequently removed by means of a deburring process, which increases productivity costs and reduces output.
  • Figures 2 and 3 illustrate two preferred embodiments of the present invention used to analyze, respectively, the shear angle A and the burr 22 of a strip edge 14.
  • Figures 2 and 3 are both intended to be similar to those shown in Figures la-lc. However, for clarity and ease of illustration, the knives 10 have been removed from the drawings.
  • Figure 3 differs from Figure 2 only in the presence of a burr 22 on the edge 14 and the positioning of the image producer 24, light source 28 and analyzer 30.
  • the image producer 24 and the light source 28 may be positioned in various orientations to frame specific areas of the edge 14.
  • the nick region 18 and the break region 20 of the edge 14 form a shear angle A with respect to each other.
  • the line 40 along the break region 20 forms the hypotenuse of a triangle having one side S ⁇ and a second side S2.
  • An angle of 90° is formed between sides S- ⁇ and S2•
  • SAS side-angle- side
  • two image producers 24, such as video cameras, are positioned such that their fields of view 32 substantially frame the break region 20 of the edge 14.
  • one image producer 24 is positioned below the strip 12 and the other image producer 24 is positioned to the side of the strip 12.
  • a light source 28 focuses an intense light beam 34 on the nick and break regions 18, 20 of the edge 14. The rest of the beam 34 extends into the relatively dark or "black” area of the background environment 36.
  • the nick and break regions 18, 20 of the edge 14 exhibit different light reflectivity coefficients.
  • the nick region 18 of the edge 14 may be able to reflect a greater portion of the incident light beam 34 than would the break region 20, or vice-versa.
  • the contrast between the reflectivity of the nick and break regions 18, 20 of the edge 14, and the relative non- reflectivity of the background environment 36, is utilized to provide the monitoring and inspection apparatus and method of the present invention.
  • the image producers 24 create a series of real-time images of the edge 14.
  • the real-time images of the edge 14 contain a first "bright” area that corresponds to the nick region 18 or the break region 20, and a second, less “bright” area that corresponds to the other of the nick or break regions 18, 20.
  • the "bright” areas are caused by the portion of the light beam 34 that is reflected by the nick and break regions 18, 20 of the edge 14.
  • the images contain "dark” areas that correspond to the background environment 36.
  • the "dark” areas are caused by the portion of the light beam 34 that is absorbed (i.e., not reflected) by the background environment 36.
  • the dimensions of the sides S ⁇ _ and S2 can be derived. As discussed above, once the lengths of the sides S ⁇ . and S2 are known, the shear angle A can be determined.
  • the apparatus and method of the present invention can also be used to measure the height of a burr 22 formed on the strip edge 14 and extending below the bottom side 50 of the strip 12.
  • At least one image producer 24, such as a video camera, is positioned such that its field of view 32 substantially frames the backside 52 of the burr 22.
  • the image producer 24 is positioned below and to the left of the strip 12.
  • a light source 28 focuses an intense light beam 34 on the backside 52 of the burr 22.
  • the rest of the beam 34 extends into the relatively dark or "black” area of the background environment 36 or onto the bottom side 50 of the strip 12.
  • the backside 52 of the burr 22 will be able to reflect a large amount of the incident light beam 34, especially as compared to the relative non-reflectivity of the background environment 36.
  • the contrast between the reflectivity of the backside 52 of the burr 22 and the relative non-reflectivity of the background environment 36 is utilized to measure the height of the burr 22.
  • the image producers 24 create a series of real-time images of the edge 14.
  • the real-time images of the edge 14 contain a "bright" area that corresponds to the backside 52 of the burr 22 and a "dark" area that corresponds to the background environment 36.
  • the "bright” and “dark” areas are caused by the portions of the light beam 34 that are, respectively, reflected by the backside 52 of the burr 22 and absorbed (i.e., not reflected) by the background environment 36.
  • the height dimension of the burr 22 can be derived. As can be deduced, the outer dimension of the "bright” area will terminate at the beginning of the "dark" area corresponding to the background environment 36.
  • each of the images of the edge 14 formed by the image producers 24 is divided into a number of pixels.
  • a standard "frame grabber” forms images having 512 pixels along the horizontal and 512 pixels along the vertical.
  • the images formed by the image producers 24 will be divided into a large number of "bright, “less bright” and “dark” pixels that define the transition between the nick and break regions 18, 20 of the edge 14 and the background environment 36.
  • the images formed by the image producer 24 will be divided into a number of "bright” and “dark” pixels that define the transition between the backside 52 of the burr 22 and the background environment 36.
  • the images produced by the image producers 24 are supplied to an analyzer 30, which may be a PC-type computer.
  • the analyzer 30 may include peripherals connected thereto, including one or more display monitors, a keyboard and/or a trackball for operator use and interaction with the monitoring and inspection apparatus.
  • the analyzer 30 is programmed to digitize the images of the strip 12, and to compare the digitized image information for the shear angle A and the burr height of the edge 14 to standard operating parameters therefor.
  • the standard operating parameters for shear angle A and burr height may be derived from the line operator's own experience in processing the specific strip stock in issue. For example, by forming images of a high- quality edge, and comparing those images with other images formed for known, poor-quality edges having, for example, unsatisfactory shear angles and burr heights, a line operator may be able to broadly define a set of standard operating parameters for, among other things, shear angle and burr height for strip edge 14. If the digitized image information falls outside of the standard operating parameters for shear angle or burr height, the analyzer 30 alerts the line operator. The line operator may then independently determine whether the shear angle A or the burr height needs to be adjusted.
  • the knives 10 may then be repositioned, either automatically or manually, or replaced, depending on what is required to remedy the problem. If the knives 10 do not need to be adjusted or replaced, the image information that caused the alert to be given can be utilized by the analyzer 30 to narrow and thereby refine the standard operating parameters for the shear angle A and/or the burr height.
  • the analyzer 30 determines that the digitized information falls within the standard operating parameters, the knives 10 are permitted to continue trimming the strip 12.
  • the image information may be stored and subsequently used to generate a revised set of standard operating parameters for that particular strip 12 and process.
  • Suitable software for handling the above- described information processing will be apparent to those in the data processing art, and does not directly form a part of the present invention.
  • One suitable image processing software is available from Integral Vision Limited of oburn Industrial Estate, Kempston, Bedford, Great Britain.
  • edge characteristics discussed above are intended to illustrate the operation and capabilities of the present invention and are not considered to be comprehensive; many additional edge characteristics may be monitored and inspected by the present invention.
  • the image producers 24 and light sources 28 utilized in the present invention may be oriented or positioned in any suitable manner to monitor and inspect one or more edge characteristics. To operate efficiently, the image producers 24 and the light sources 28 have to be positioned such that the relevant surfaces of the edge 14 are included within their respective fields of view. Further, depending on the application and the number of edge characteristics that are desired to be monitored and inspected, it should be appreciated that any suitable number of image producers 24 and light sources 28 may be used in the present invention. For example, two light sources 28 may be used with each single image producer 24, or vice-versa.
  • the analyzer 30 may comprise a PC-type computer having at least a 66 Mhz 80486 processor, 8 MB of RAM, 2 camera inputs, 16 digital input/output (24 Volts DC) and a 400 MB hard disk;
  • the peripherals for the analyzer 30 may include a SVGA monitor, a keyboard and a mouse or trackball;
  • the image producers 24 may comprise "TM-6" series CCD cameras having 75 mm lenses provided by Pulnix; and the light sources 28 may be "Type 800 Microlight” infrared illuminators provided by Dennard.
  • the present invention by monitoring in real time the various characteristics of strip edge, allows the knives 10 to be timely adjusted or replaced when they begin to operate outside of normal operating parameters. Such real-time monitoring of the strip edge may prevent the unnecessary scrapping or subsequent re-working of strip product.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

Le procédé pour surveiller et inspecter un bord d'une bande métallique consiste à utiliser au moins un dispositif produisant des images, ayant un champ de vision qui encadre sensiblement le bord, en utilisant le ou les producteurs d'images pour former une première série d'images du bord après que le bord a été formé par un couteau; et à analyser en temps réel la première série d'images pour déterminer l'angle de cisaillement et/ou la hauteur des barbes du bord.
PCT/US1996/020643 1996-01-19 1996-12-27 Procede et appareil pour surveiller et inspecter le bord d'une bande Ceased WO1997027968A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU13499/97A AU1349997A (en) 1996-01-19 1996-12-27 Method and apparatus for monitoring and inspecting strip edge

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/588,625 US5857031A (en) 1996-01-05 1996-01-19 Method and apparatus for monitoring and inspecting strip edge
US08/588,625 1996-01-19

Publications (1)

Publication Number Publication Date
WO1997027968A2 true WO1997027968A2 (fr) 1997-08-07

Family

ID=24354627

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/020643 Ceased WO1997027968A2 (fr) 1996-01-19 1996-12-27 Procede et appareil pour surveiller et inspecter le bord d'une bande

Country Status (2)

Country Link
AU (1) AU1349997A (fr)
WO (1) WO1997027968A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000015375A1 (fr) * 1998-09-10 2000-03-23 Asko, Inc. Outil de conception

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000015375A1 (fr) * 1998-09-10 2000-03-23 Asko, Inc. Outil de conception
US6314388B1 (en) 1998-09-10 2001-11-06 Asko, Inc. Design tool for predictively indicating edge conditions in metal slitting

Also Published As

Publication number Publication date
AU1349997A (en) 1997-08-22

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