US3826120A - Reduction of slack in metal coil slitting lines - Google Patents

Reduction of slack in metal coil slitting lines Download PDF

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Publication number
US3826120A
US3826120A US00379094A US37909473A US3826120A US 3826120 A US3826120 A US 3826120A US 00379094 A US00379094 A US 00379094A US 37909473 A US37909473 A US 37909473A US 3826120 A US3826120 A US 3826120A
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US
United States
Prior art keywords
strips
powder
narrower strips
slitting
bed
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.)
Expired - Lifetime
Application number
US00379094A
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English (en)
Inventor
R Ketterer
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.)
Cincinnati Inc
Original Assignee
Cincinnati 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
Application filed by Cincinnati Inc filed Critical Cincinnati Inc
Priority to US00379094A priority Critical patent/US3826120A/en
Priority to GB977474A priority patent/GB1430927A/en
Priority to CA194,347A priority patent/CA984738A/en
Priority to DK188474A priority patent/DK188474A/da
Priority to DE2417573A priority patent/DE2417573A1/de
Priority to IT68387/74A priority patent/IT1011822B/it
Priority to FR7419248A priority patent/FR2236763B1/fr
Priority to SE7408376A priority patent/SE7408376L/
Application granted granted Critical
Publication of US3826120A publication Critical patent/US3826120A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B23D33/00—Accessories for shearing machines or shearing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/006—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only winding-up or winding-off several parallel metal bands

Definitions

  • ABSTRACT discloses the reduction of slack in metal coil slitting lines, wherein a relatively wide strip is passed through a slitting instrumentality by which it is slit into a plurality of narrower strips which are then recoiled by a common recoiling device.- Because of variations in thickness across the width of the original strip, the recoiled narrower strips which are being rewound simultaneously, will have various degrees of slack, resulting in some loose coils.
  • an electrostatic fluidized bed is disposed between the slitting device and the recoiler, below the slit strips.
  • the bed contains a suitable powder, such as mica; and as any one of the slit strips sags toward the fluidized and charged bed, it picks up some of the charged powder particles.
  • the pick-up is proportionate to the amount of sag, or proximity of the sagging strip to the bed.
  • the picked up powder is trapped in the wraps of the strip on the recoiler, effectively thickening the wrap, and thus restores tension and results in taking up the slack.
  • the system is self-compensating and automatic.
  • the rewinding machine imparts the same angular velocity to the smaller coils even though there may be a variation in material thickness as a result of the original rolling process.
  • the original relatively wide strip is thicker toward the middle and thinner near the edges, or vise versa.
  • the variation in thickness causes a different tension on the rewind and varies the tightness of the several coils.
  • the net effect is to produce more slack in the infeed material between the rewinder and the slitting coils for those strips which are thinner. This error of course accumulates and causes loose wound coils unless some compensation is applied.
  • Another practice which is less expensive, is to insert pieces of cardboard intermittently and manually into the rewind reel at those points where the slack is excessive. This is of course an extremely hazardous procedure in that a man's hand can readily be caught and wrapped into the coil.
  • a further disadvantage resides in the fact that the paper interleaves are shipped with the coil to the end user; and if allowed to be further processed with the steel, they can cause damage to dies and roll forming machinery. Furthermore, on light gauge material particularly the paper itself can deform the metal which is coiled.
  • the present invention overcomes the disadvantages described above in a simple and relatively inexpensive and substantially self-compensating and automatic way.
  • An electrostatic fluidized bed of conventional construction (which in itself forms no part of the present invention) is disposed between the slitting device and the recoiler below the slit strip and extending across the entire width of all the slit strips.
  • the strip itself is grounded.
  • the slit strips sags to a greater or lesser degree, it attracts particles of electrostatically charged powder from the fluidized bed and these particles cling to the particular strip.
  • the amount of powder attracted depends upon the proximity of the strip to the fluidized bed, or in other words upon the amount of sag of the particular strip.
  • the more a strip sags the more powder will be attracted and deposited on it and carried foward to the rewinding instrumentality where it is trapped in the wraps of the strip as it is being rewound.
  • the powder effectively thickens the wrap of the particular strip and thus restores tension and results in taking up the slack.
  • the system Since the amount of powder picked up is in direct proportion to the amount of sag, the system is automatic and self-compensating.
  • FIGURE of the drawing is a diagrammatic representation of a slitting line showing the invention.
  • a slitter is indicated diagrammatically at 10.
  • a recoiling device is indicated diagrammatically at 11.
  • the horizontal line 12 represents the passline of a tight strip.
  • the broken line 13 represents a slack strip.
  • An electrostatic unit is diagrammatically indicated at 14. This may be a so-called electrostatic cloud coater manufactured by The Electrostatic Equipment Corporation.
  • the electrostatic cloud coater is a conventional device and in and of itself does not form a part of the present invention. It comprises a plenum chamber and a plate in the upper'portion upon which the powder is deposited and an electrostatically charged grill through which the powder moves and by which it is electrostatically charged. Above the electrostatic cloud coater 14 is provided a hood 15 connected to an exhaust system to collect excess powder.
  • the parameters of the location of the electrostatic cloud coater with respect to the strip 12 will depend of course upon the distance between the slitter 10 and the recoiler 11, the speed of passage of the strip, the particular powder used in the fluidizing device, and the like.
  • the centerline of the electrostatic cloud coater was disposed substantially at the midpoint therebetween.
  • the electrostatic unit was positioned so that a tight strip would be eight inches away from the bed. At this distance, a very thin coating of powder was obtained and a heavier coating was attained as the strip sagged.
  • the .strip was run at approximately three hundred to four hundred feet per minute.
  • the air flow in the fluidizing apparatus was about seven cubic feet per minute.
  • the grill was charged with fifty kilovolts and the strip was grounded.
  • the particular powder used was No. IOO-K Dry Ground Mica obtained from US. Mica Company. Both fifteen and sixteen gauge material was run through the apparatus and the width of the slit strips was four and one-half inches.
  • mica is an excellent material for this purpose since it is relatively inexpensive and abundant so that it is readily available.
  • other materials may be used provided they behave well electrostatically, are not corrosive to the metalbeing slit, are readily removable from the strip if desired for later operation, and if the powder'is allowed to remain on the slit coils it should be lubricative in nature.
  • a relatively wide strip is passed through a slitting instrumentality, whereby it is slit into a plurality of relatively narrower strips, which narrower strips are then recoiled on a common recoiling device, and wherein, as a result of variations in the thickness of the relatively wide strip across its width, one or more of the relatively narrower strips will sag to varying degrees more than others of said relatively narrower strips, resulting in some loose coils of the narrower strips, the improvement comprising: an electrostatic fluidized powder bed disposed about midway between said slitting instrumentality and said recoiling device, and below said relatively narrower strips, and extending entirely across the width of all said relatively narrower strips; whereby particles of electrostatically charged powder from said fluidized bed are attracted and cling to the sagging ones of said relatively narrower strips, in proportion to the proximity thereof to said bed as a result of the sagging, said particles clinging to said strips and being trapped in the wraps of

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
US00379094A 1973-07-13 1973-07-13 Reduction of slack in metal coil slitting lines Expired - Lifetime US3826120A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00379094A US3826120A (en) 1973-07-13 1973-07-13 Reduction of slack in metal coil slitting lines
GB977474A GB1430927A (en) 1973-07-13 1974-03-05 Reduction of slack in metal coil slitting lines
CA194,347A CA984738A (en) 1973-07-13 1974-03-07 Reduction of slack in metal coil slitting lines
DK188474A DK188474A (ja) 1973-07-13 1974-04-04
DE2417573A DE2417573A1 (de) 1973-07-13 1974-04-10 Verfahren und vorrichtung zur verringerung des durchhanges der beim laengsschneiden eines metallbandes entstehenden streifen
IT68387/74A IT1011822B (it) 1973-07-13 1974-05-03 Procedimento e dispositivo per ri durre l allentamento in una linea di taglio longitudinale e di avvol gimento di un nastro di lamiera
FR7419248A FR2236763B1 (ja) 1973-07-13 1974-06-04
SE7408376A SE7408376L (sv) 1973-07-13 1974-06-25 Sett och anordning for kompensering av olika nedhengning vid uppslitsning av ett metallband i ett flertal remsor.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00379094A US3826120A (en) 1973-07-13 1973-07-13 Reduction of slack in metal coil slitting lines

Publications (1)

Publication Number Publication Date
US3826120A true US3826120A (en) 1974-07-30

Family

ID=23495795

Family Applications (1)

Application Number Title Priority Date Filing Date
US00379094A Expired - Lifetime US3826120A (en) 1973-07-13 1973-07-13 Reduction of slack in metal coil slitting lines

Country Status (8)

Country Link
US (1) US3826120A (ja)
CA (1) CA984738A (ja)
DE (1) DE2417573A1 (ja)
DK (1) DK188474A (ja)
FR (1) FR2236763B1 (ja)
GB (1) GB1430927A (ja)
IT (1) IT1011822B (ja)
SE (1) SE7408376L (ja)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443307A (en) * 1967-02-02 1969-05-13 Vdo Schindling Method of producing a flexible protection tube for a flexible shaft guided in the tube with radial play

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443307A (en) * 1967-02-02 1969-05-13 Vdo Schindling Method of producing a flexible protection tube for a flexible shaft guided in the tube with radial play

Also Published As

Publication number Publication date
CA984738A (en) 1976-03-02
IT1011822B (it) 1977-02-10
DE2417573A1 (de) 1975-01-30
DK188474A (ja) 1975-02-24
SE7408376L (sv) 1975-01-14
GB1430927A (en) 1976-04-07
FR2236763B1 (ja) 1977-03-11
FR2236763A1 (ja) 1975-02-07

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