US3817095A - Device for detecting and correcting defects in the flatness of a product in strip form - Google Patents

Device for detecting and correcting defects in the flatness of a product in strip form Download PDF

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Publication number
US3817095A
US3817095A US00398076A US39807673A US3817095A US 3817095 A US3817095 A US 3817095A US 00398076 A US00398076 A US 00398076A US 39807673 A US39807673 A US 39807673A US 3817095 A US3817095 A US 3817095A
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US
United States
Prior art keywords
roller
product
contacting
varying
contact
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Expired - Lifetime
Application number
US00398076A
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English (en)
Inventor
L Diolot
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.)
Societe Nouvelle Spidem
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Societe Nouvelle Spidem
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Filing date
Publication date
Priority to FR7031357A priority Critical patent/FR2102875A5/fr
Priority to GB3973871A priority patent/GB1351674A/en
Priority to DE19712143083 priority patent/DE2143083A1/de
Application filed by Societe Nouvelle Spidem filed Critical Societe Nouvelle Spidem
Priority to US00398076A priority patent/US3817095A/en
Application granted granted Critical
Publication of US3817095A publication Critical patent/US3817095A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B13/00—Measuring arrangements characterised by the use of fluids
    • G01B13/22—Measuring arrangements characterised by the use of fluids for measuring roughness or irregularity of surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/28—Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces

Definitions

  • Cylinders which may he isolated 51 Int. Cl. B21d 7/04 from their supply [58] Field of Search 72/8, 9, 12, 17; 73/159 9 Claims, 1 Drawing Figure DEVICE FOR DETECTING AND CORRECTING DEFECTS IN THE ELATNESS OF A PRODUCT IN STRIP FORM whose defects are to be detected and corrected, in the present case the metal strip being rolled.
  • This roller is divided into successive transverse sections which are fast with one another but are nevertheless capable of a certain amount of relative transverse displacement. Since the roller assembly is applied against the metal strip with asubstantialforce, the tension of the latter results ina reaction at each of the sections of the roller, this reaction depending precisely on the temporary tension to which the portion of strip corresponding to the section in question is subjected.
  • the partial tensions corresponding to the various sections may vary relatively to one another and the same applies as regards the transverse positions of the corresponding roller sections, whose position in space is consequently modified.
  • a displacement detector is associated with each of thesections, the indications of this detector reproducing precisely the inequalities which appear between the partial tensions of each of the portions of strip monitored.
  • the indicators for the positions of each transverse section of the roller are situated within the roller, in order not to disturb peripheral uniformity.
  • the device according to the present invention makes itpossible to obviate these various disadvantages.
  • the devices for indicating the position of the various transverse sections of the roller are arranged not internally but externally of the latter. This kind of arrangement is applicable whether the roller is subdivided into a cer-- tain number of transverse sections or whether it is simply a case of a roller made in one piece, but having a certain elasticity, which enables it to show slight deformations in dependence on variations in the tension of the strip at different points on the line of contact between strip and roller.
  • means are provided which can be interposed between the roller and the position indicators, these means being intended to facilitate contacts between the indicators which are arranged in fixed positions and, on the other hand, the peripheral surface of the roller, which is constantly rotating.
  • the signals emanating from the indicators are transmitted to appropriate detectors each of which is connected to en element known by itself and on which depends the correction made in the treatment machine, the rolling mill in the present case, this correctionhaving the result of compensating to the desired extent for theexcess or lack of tension manifested in the portion of strip corresponding to the indicator in question.
  • the pressure pickups are used at the same time as means for reacting to the pressure acting on the roller owing to the tension of the strip.
  • this tension which is assumed to'be applied along the line of contact between the strip and the roller, has the result of urging the latter towards the interior of the frame from which it projects; therefore, it is advantageous to direct thereaction force emanating from the position indicators in the opposite sense to the aforenoted pressure, thatis to say in a direction such that the roller is subjected this time toa pressure directed towards the exterior of the frame.
  • the single FIGURE shows a general cross section through the device according to the invention.
  • a roller 1, known by itself, is engaged by a strip product 2 passing in the direction of the arrow f and exerting on the roller 1, along the common contact face 3 between the strip and the roller a certain pressure under the influence of which the roller 1 tends to move into the surrounding housing 4.
  • the roller 1 may be formed of a plurality of axially adjoining sections as shown, for example, in FIG. 3 of the aforementioned patent application.
  • Two position indicators 5 and 6 formed as hydraulic jacks have, according to the invention, the function, among others, to act as force-producing means intended to compensate for the pressure exerted on the roller by the strip 2. It is noted that, in case the roller 1 is formed of sections as indicated before, with each such section there is associated one pair of hydraulic jacks 5, 6. In the example being considered, the two hydraulic jack indicators 5, 6 bear on a cross member 7 of the housing or frame 4 and constitute transducer means.
  • each of these jacks its cylinder is shaped accordingly as indicated in the drawing at 5a; the initial pressure prevailing in the jacks thus arranged, before the machine starts, is defined so as to bring about an incident pressure in the .case of the drawing, slightly greater than the dead weight of the roller.
  • the device in question comprises two pivotable arms 8 and 9 articulated on a pivot 10 and each terminating at the opposite end in a wheel 11 and 12 respectively rotating freely about shafts such as 13 and 14.
  • the jacks 5 and 6, bearing on the cross member 7 of the frame 4, are arranged so as to exert their forces on the arms 8 and 9, the wheels 11 and 12 being then applied against the periphery of the roller 1.
  • the jacks 5 and 6 To permit the jacks 5 and 6 to perform their task as pressure pick-ups, it is sufiicient to lock-in the quantity of fluid which each of them contains and then to provide a pressure indicator in the circuit of each jack, this indicator being also arranged so as to be capable of emitting a signal which fluctuates in time and is consequently adapted to follow the variations in the position in space of the section of roller 1 corresponding to the median plane common to the two wheels 11 and 12.
  • the pivot 10 may be a sole shaft that extends all along the axis of the main roller 1 and parallel thereto.
  • the various shafts 13 and 14 corresponding to the successive wheels 11 and 12 they will be in alignment when the device is in the inoperative state but already under stress.
  • these various shafts will become slightly offset relatively to one another under the action of the pressure difference resulting from the deformations to which the main roller 1 is subjected.
  • the outlet conduits 15 and 16 of the jacks 5 and 6 are directly connected in parallel then connected to a pressure indicator 17. Upstream of this indicator there is arranged a shutoff device, a valve 18, for example, whereby the apparatus situated downstream can be completely shut off from the pressure source. Upstream of the shut off device 18, the installation which has just been described is connected to a general supply header 19 into which the hydraulic pressure generator 20 delivers.
  • the journal 22 of the roller 1 is capable of moving along substantially vertical slideways 21 (one shown).
  • the device operates as follows.
  • the indicator 17 this time indicating a drop in pressure in the jacks 5 and 6, and the correcting signal emitted by this indicator is directed in the opposite sense to the previous signal.
  • shutoff valves 18 are opened, which makes it possible to equalize by means of the hydraulic source 20 the pressure prevailing in the installation in general, as described. It is then sufficient to isolate each of the assemblies such as that shown in the drawing, closing the shutoff valves 18.
  • the roller 1 can be given an additional degree of freedom in the longitudinal direction.
  • this roller is capable of being supported solely by the two rows of wheels such as 11 and 12. A certain lateral play in the slideway 21 would consequently increase the sensitivity of the reaction of the roller 1 to variations in tension of the strip, thus also resulting in greater sensitivity in the response of the jacks S and 6.
  • a freely rotatable roller positioned normal to the traveling direction of said product and being in contact with said product along its width, said roller being formed of a plurality of successive, axially aligned and adjoining sections each being in contact with adjacent width portions of said product, each section of said roller being movable radially independently from the other sections in response to the varying tension in the associated width portion contacting the roller section, and
  • sensor means disposed externally of said roller and associated with each roller section for indicating the radial displacements of each roller section, said sensor means including,
  • roller sections in engagement with the outer periphery of each roller section at locations remote from the area of contact between roller and product, said roller sections exerting a varying force on said contacting means in response to said varying tension, and
  • transducer means in engagement with said contacting means for receiving said varying force from said contacting means and transforming said varying force into signals of varying magnitude, said transducer means including,
  • hydraulic jack means in engagement with said contacting means for sensing said varying forces transmitted thereto by said contacting means and 2. stationarily held cylinder means receiving said hydraulic jack means.
  • shutoff means one associated with each transducer means and disposed in said hydraulic conduit means between said transducer means and said hydraulic pressure source.
  • sensor means disposed externally of said roller and associated with each roller section for indicating the radial displacements of each roller section, said sensor means including,
  • contacting means in engagement with the outer periphery of each roller section at locations remote from the area of contact between roller and product, said roller sections exerting a varying force on said contacting means in response to said varying tension
  • transducer means in engagement with said contacting means for receiving said varying force from said contacting means and transforming said varying force into signals of varying magnitude, said contacting means including,
  • each arm forming said arm means has a common pivotal axis parallel with the rotational axis of said roller.
  • a freely rotatable roller positioned normal to the traveling direction of said product and being in contact with said product along its width, said roller being formed as a single piece roller in contact with an adjacent width portion of said product and being mounted for movement in response to the varying tension in the associated width portion of said product contacting said roller, and
  • sensor means disposed externally of said roller and associated therewith for indicating the radial displacement of said roller, said sensor means including,
  • transducer means in engagement with said contacting means for receiving said varying force from said contacting means and transforming said varying force into signals of varying magnitude, said transducer means including,
  • hydraulic jack means in engagement with said contacting means for sensing said varying forces transmitted thereto by said contacting means and 2. stationarily held cylinder means receiving said hydraulic jack means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
US00398076A 1970-08-27 1973-09-17 Device for detecting and correcting defects in the flatness of a product in strip form Expired - Lifetime US3817095A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR7031357A FR2102875A5 (enrdf_load_stackoverflow) 1970-08-27 1970-08-27
GB3973871A GB1351674A (en) 1970-08-27 1971-08-24 Device in rolling mill apparatus for detecting defects in the flatness of the strip product
DE19712143083 DE2143083A1 (de) 1970-08-27 1971-08-27 Vorrichtung zum Feststellen und Korn gieren von Unebenheiten von bandartigen Erzeugnissen
US00398076A US3817095A (en) 1970-08-27 1973-09-17 Device for detecting and correcting defects in the flatness of a product in strip form

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR7031357A FR2102875A5 (enrdf_load_stackoverflow) 1970-08-27 1970-08-27
US17544771A 1971-08-27 1971-08-27
US00398076A US3817095A (en) 1970-08-27 1973-09-17 Device for detecting and correcting defects in the flatness of a product in strip form

Publications (1)

Publication Number Publication Date
US3817095A true US3817095A (en) 1974-06-18

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US00398076A Expired - Lifetime US3817095A (en) 1970-08-27 1973-09-17 Device for detecting and correcting defects in the flatness of a product in strip form

Country Status (4)

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US (1) US3817095A (enrdf_load_stackoverflow)
DE (1) DE2143083A1 (enrdf_load_stackoverflow)
FR (1) FR2102875A5 (enrdf_load_stackoverflow)
GB (1) GB1351674A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902363A (en) * 1972-03-03 1975-09-02 Hitachi Ltd Apparatus for detecting profile of band plate
US4116029A (en) * 1976-07-24 1978-09-26 Hoesch Werke Ag Device for measuring the flatness of metal strips
US4332154A (en) * 1979-02-01 1982-06-01 Asea Aktiebolag Deflector roll
US4674310A (en) * 1986-01-14 1987-06-23 Wean United Rolling Mills, Inc. Strip tension profile apparatus and associated method
US4972706A (en) * 1988-06-02 1990-11-27 Asea Brown Boveri Ab Device for measuring the flatness of rolled strip
US4976158A (en) * 1989-05-08 1990-12-11 United Engineering, Inc. Tension measuring apparatus
US6658947B1 (en) 2000-08-25 2003-12-09 T. Sendzimir, Inc. Strip flatness measuring device
US20050183497A1 (en) * 2004-02-20 2005-08-25 Bwg Bergwerk-Und Walzwerk-Maschinenbau Gmbh Strip planarity measuring method and apparatus
CN108453149A (zh) * 2018-05-15 2018-08-28 江阴市博汇机械成套设备有限公司 一种大型薄壁筒体的整形工装
CN118794382A (zh) * 2024-09-13 2024-10-18 沈阳科一电气有限公司 一种pcb板平整度检测装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2181852A (en) * 1985-10-17 1987-04-29 British Steel Corp Measuring distribution of tension in strip

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2826911A (en) * 1955-04-04 1958-03-18 Champion Internat Company Apparatus for detecting defects in sheet materials
US3581536A (en) * 1969-04-17 1971-06-01 Gen Electric Apparatus for sensing the unstressed shape of a thin strip subjected to high tensile stress

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2826911A (en) * 1955-04-04 1958-03-18 Champion Internat Company Apparatus for detecting defects in sheet materials
US3581536A (en) * 1969-04-17 1971-06-01 Gen Electric Apparatus for sensing the unstressed shape of a thin strip subjected to high tensile stress

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902363A (en) * 1972-03-03 1975-09-02 Hitachi Ltd Apparatus for detecting profile of band plate
US4116029A (en) * 1976-07-24 1978-09-26 Hoesch Werke Ag Device for measuring the flatness of metal strips
US4332154A (en) * 1979-02-01 1982-06-01 Asea Aktiebolag Deflector roll
US4674310A (en) * 1986-01-14 1987-06-23 Wean United Rolling Mills, Inc. Strip tension profile apparatus and associated method
US4972706A (en) * 1988-06-02 1990-11-27 Asea Brown Boveri Ab Device for measuring the flatness of rolled strip
US4976158A (en) * 1989-05-08 1990-12-11 United Engineering, Inc. Tension measuring apparatus
US6658947B1 (en) 2000-08-25 2003-12-09 T. Sendzimir, Inc. Strip flatness measuring device
US20050183497A1 (en) * 2004-02-20 2005-08-25 Bwg Bergwerk-Und Walzwerk-Maschinenbau Gmbh Strip planarity measuring method and apparatus
US7357022B2 (en) * 2004-02-20 2008-04-15 Bwg Bergwerk-Und Walzwerk-Maschinenbau Gmbh Strip planarity measuring method and apparatus
CN108453149A (zh) * 2018-05-15 2018-08-28 江阴市博汇机械成套设备有限公司 一种大型薄壁筒体的整形工装
CN108453149B (zh) * 2018-05-15 2024-06-11 江阴市博汇机械成套设备有限公司 一种大型薄壁筒体的整形工装
CN118794382A (zh) * 2024-09-13 2024-10-18 沈阳科一电气有限公司 一种pcb板平整度检测装置

Also Published As

Publication number Publication date
GB1351674A (en) 1974-05-01
DE2143083A1 (de) 1972-03-02
FR2102875A5 (enrdf_load_stackoverflow) 1972-04-07

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