EP0550667A4 - Method and apparatus for processing continuous strip sheet metal - Google Patents
Method and apparatus for processing continuous strip sheet metalInfo
- Publication number
- EP0550667A4 EP0550667A4 EP19910918772 EP91918772A EP0550667A4 EP 0550667 A4 EP0550667 A4 EP 0550667A4 EP 19910918772 EP19910918772 EP 19910918772 EP 91918772 A EP91918772 A EP 91918772A EP 0550667 A4 EP0550667 A4 EP 0550667A4
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet metal
- vortex
- liquid
- enclosure
- station
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/022—Cleaning travelling work
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
Definitions
- Pretreatment processing in a continuous steel strip plating line involves removing the soil and preparing the surface in order to assure dependable adherance of the plating.
- a typical line processing stages including electrocleaning in an alkaline electrolyte tank; brush scrubbing to remove the loosened soil; in some cases, such as double reduced batch annealed strip steel , a second stage of electrolytic cleaning in an alkaline electrolyte tank, followed by further brush scrubbing; pickling in an acid solution tank; again followed by brush scrubbing before entering an electroplating tank.
- the current electrolizes the water to form hydrogen gas at the negatively charged cathode and oxygen at the positively charged anode.
- the large columns of these gases generated at or near the strip surface provide the mechanical energy for cleaning in the form of bubbles which loosen the surface soil.
- Dispersion and replenishment of the surface bubbles on passing continuous steel strip enhances the cleaning process which in conventional practice is somewhat curtailed by liquid drag at the boundary layer which ten_.s to carry a layer of bubbles rather than to dipserse them.
- boundary layer also insulates the surface to impede the chemical action of the cleaner.
- Vortex diffuser substitutions of the present invention overcome certain limitations and defects of convention cleaning, scrubbing and pickling units.
- Vortex diffuser prior art includes a fluid bearing device disclosed in ⁇ . S. Patent 3,782,791 as a fluid bearing load supporting system having unidirection and omnidirectional capabilities which embody means for forming one or a plurality of fluid vortices for separating a body from a supporting surface by an intervening cushion of fluid, providing therewith an extremely low coefficient of friction that facilitates a conveyance of the body for the purposes of transportation, processing, treatment and the like.
- the fluid substance discharged conventionally comprises air; however , the patent discloses that alternative fluids can be used including fluids and fluid mixtures, and that the use of such alternative fluid substances is desirable when the vortex diffuser fluid bearing device is employed for effecting a simultaneous conveyance and processing of work pieces supported thereby.
- Such selected treatments can be achieved in a prescribed sequentially-phased manner by changing the type of fluid substance discharged from selected sections of the air rail assembly such that each work piece is subjected to a prescribed treatment during its travel along each section; and by selecting the appropriate gaseous substance, work pieces such as a container can be subjected to treatments including cleaning, etching, conversion coating, surface coating or painting, electrostatic coating applications, electrocoating or painting, heat treating, baking, drying, cooling, quenching, lubricating, etc.
- work pieces such as a container can be subjected to treatments including cleaning, etching, conversion coating, surface coating or painting, electrostatic coating applications, electrocoating or painting, heat treating, baking, drying, cooling, quenching, lubricating, etc.
- Electrolytic alkaline cleaning may be performed, without submersion in a liquid alkaline bath, by passing continuous steel strip between opposed liquid alkaline vortex diffusers in close fractional inch proximity to the strip and including a series of transverse longitudinally spaced vortex rails having alternately oppositely charged metal vortex cups which electrolyze the liquid alkaline vortex discharge to create successive hydrogen and oxygen bubbling at the strip surface with immediate removal by the vortex action.
- Conductivity in the metal strip between vortex rails completes the electrolytic circuit, as in the case of conventional tank cleaning, with a major difference of continuous bubble dispersion more effectively removing the soil rather than merely loosening it for brush removal as in conventional electrolytic cleaning.
- Enhanced chemical action at the surface is also realized.
- Liquid drag at the boundary layers is avoided and liquid containment at the cleaning station is effected by liquid knives directed inwardly at the entrance and exit of enclosures for the cleaning station.
- Such knives take the place of conventional wringer rolls, which together with deflection rolls have been dispensed with.
- the present invention employs vortex diffuser hot water rinsing to remove any alkaline solution from the strip surface.
- Successive pickling and rinse stations are similarly isolated preferably by liquid knives which confine the liquid within the enclosure at each of the individual stations. Air knives or wringer rollers are optionally available for such purpose.
- Such stations preferably employ a "Strip Tech Module" which may be the same or similar for all successive stations.
- Such module has a fixed lower set of vortex rails with manifolds supplied by manifold headers and pumps, together with entrance and exit liquid knives for liquid containment.
- a hinged top unit of the module contains upper vortex diffuser rails, manifolds and liquid knives supplied by connections with the lower manifold supply which are completed by closing of the upper unit so as to dispense with any need for flexible hose connections.
- the upper unit is opened by hydraulic motors adapted to actuate through the hinge opening and closing of the upper unit for strip threading and servicing purposes.
- the method and apparatus of the present invention include a sheet feeder for developing the processing parameters for particular metal condition and processing requirements thereby minimizing the need for experimental testing of variables on a complete continuous strip line.
- Such sheet feeder conveys a single sheet of sample material over a succession of processing stations adapted to selectively clean, rinse, pickle and plate at conveyance speeds equal to and exceeding continuous strip mill speeds. Removal and inspection of each individual piece of sheet metal accommodates advance process testing of such parameters as vortex diffuser to sheet gap; effective relative speeds; effective variations in cleaner liquid chemistry; electrocleaning voltage; vortex diffuser design variations; vortex pressure variations; different soil conditions on metal surface; different pickling solutions; different vortex cup configurations and spacing etc., in order to both minimize test requirements on a complete line and optimize vortfc.c diffuser results.
- an enclosure with a continuous metal belt driven at controlled variable speeds in an enclosure with superimposed vortex diffuser rails supplied with liquid under variable pressure, together with air or liquid knives at the entrance and/or exit of the enclosure accommodates simulation of continuous strip operation for visually observed pretesting of the effective pressure variations, vortex cup design and spacing, gap variations and the like.
- FIG. 1 is a schematic view of a prior art chrome plating line
- FIG. 2 is a schematic view of a comparable vortex diffuser line
- FIG. 3 is a perspective view of a typical vortex diffuser Strip Tech Module with its top section closed;
- FIG. 4 is a perspective view of the FIG. 3 module with the top section open;
- FIG. 5 is a phantom view of the FIG. 3 module illustrating the internal piping
- FIG. 5A is an enlarged sectional view illustrating a typical connection between upper and lower vortex or liquid knife manifolds taken through the center line of such connection in an area such as identified by circled FIG. 5A in FIG. 5;
- FIG. 5B is a further enlarged fragmentary view of the sectional area identified by circled 5B in FIG. 5A illustrating O-ring seals for providing liquid containment;
- FIG. 5C is a fragmentary sectional view of a typical liquid knife manifold
- FIG. 5D is a sectional fragmentary view of a typical vortex manifold
- FIG. 5E is an enlarged perspective view of a single vortex cup
- FIG. 6 is a perspective view of a "sheet feeder" high speed continuous strip simulator
- FIG. 6A is an enlarged perspective broken view illustrating the internal arrangement at a typical location such as indicated at A in FIG. 6;
- FIG. 7 is a perspective view of an endless sheet metal or plastic belt continuous strip simulator.
- FIG. 1 a typical prior art chrome plating line is schematically illustrated showing cleaning, scrubber and pickling stations for which vortex diffuser substitutions of the present invention have been developed, tested and successfully reduced to practice.
- the additional operations performed at the chrome plater, reclaim tank, spray rinse, hot rinse tank, dryer and electrostatic oiler are believed capable of similar vortex diffuser substitution, e.g, as an extension of the technology described in U.S. Patent No. 3,957,599, Process for Electrowinning with regard to plating stationary sheet metal.
- strip steel 49 from the looping tower is fed through drag bridle rollers 50 and deflection roller 51 into liquid bath 52 of the cleaning tank passing between pairs of alternately charged plus and minus grids 53 and 54 which produce current electrolizing the water in the electrolytic alkaline cleaning liquid to form oxygen at the positively charged anode grids and hydrogen -*as at the negatively charged c-thode grids, the bubbling of which near the strip surface provides J_e mechanical energy for cleaning.
- deflection roller 55 and wringer rollers 56 lead strip 49 to scrubber unit 57 including a pair of entrance wringer rollers 58, a series of four brush scrubbers 59, alternately upper and lower with backup rollers on the opposite side, and exit wringer rollers 60.
- a second duplicate cleaning operation 61 and scrubber operation 62 lead to pickling tank 63 where deflection rolls 64 lead strip 49 through a bath of acid pickling liquid with exit deflection rolls 65 leading to a third scrubber unit 66.
- the corresponding line incorporating vortex diffuser technology of the present invention includes a series of vortex diffuser stations, each comprising one or more Strip Tech Modules, as later described in detail.
- Strip 49a leaving a conventional looping tower passes horizontally straight through a vortex precleaning heating unit, a series of three Strip Tech Modules 67 serving as a vortex electrolytic cleaner unit; a vortex rinse unit; a vortex pickler unit; a vortex rinse unit; and vortex dryer unit preceeding entrance to a chrome plater.
- each vortex rail includes liquid plenum 77 feeding a plurality of electrically conductive metal vortex cups 78 seated in metal plate 79 retained by nonconductive cover 80. As shown in FIG.
- each liquid knife rail comprises plenum 81 feeding liquid knife slit 82 at the juncture of horizontal plate 83 and adjustable vertical angle plate 84 with the liquid knife exit directed inwardly at both entrance and exit of the module in order to provide liquid containment.
- six pipe lines 85 provide liquid under pressure through flexible isolators 86 to the six pairs of liquid knife and vortex plenums, which are in turn supplied by three pumps through three filters, three control valves and three manifold headers.
- Pump 87 supplies both pairs of liquid knives through filter 88, control valve 89 and header 90.
- the inboard manifolds are supplied by pump 91, filter and control valve not shown, and header 92; and outboard manifolds are supplied by pump 93, filter 94, control valve 95 and header 96.
- each of six supply passages 97 from a lower plenum 98 to an upper plenum 99 is sealed, when upper section 69 is closed over lower section 70, by a pair of O-rings 100 saated in annular grooves 101. Tapered shoulders 102 on inserts secured to the respective plenums serve to assure accurate alignment of each pair of plenums.
- each vortex cup 78 is provided with four inlet holes 103 leading to tangential outlets at the interior perimeter 104 so as to create vortex swirling of the liquid discharged against passing strip 49a.
- each of the three adjacent modules 67 is provided with electrical connections, not shown, to the respective manifold plates 79 with alternate positive and negative electrical circuits in order to electrolize the water to form hydrogen gas at the negatively charged cathode and oxygen at the positvely charged anode.
- electrical connections may be omitted, but the modules are otherwise standardized, to provide successive required surface treatment of the passing strip metal.
- Vortex cups having one and one-half inch cylindrical discharge opening were positioned in staggered relation across each rail in contiguous relation relative to area coverage of passing strip surface with a gap spacing in the range of 5/32 to 3/4 inch utilizing liquid vortex plenum pressure of 30 psi and liquid knife pressure of 16 psi.
- a current density of 1000 amps/sq. ft. was achieved.
- the illustrated five module vortex chrome plater h. ot been tested on line to date, but based on an extension of the technology of the vortex Process for Electrow inning disclosed in ⁇ . S. Patent 3 , 957 , 599 and the aforementioned successful results of vortex diffuser electrolyte cleaning of a moving strip, equally successful plating is foreseen. While such patent is limited in its disclosure to plating on a stationary sheet, which comprises the cathodic portion of an electrolytic couple, applicants believe that effective metal plating may be achieved on a cathodic moving strip using an appropriate electrolyte with electrical contact to the strip. Likewise, it is anticipated that the vortex rinse following plating will be effective for reclaiming the electrolyte solution.
- the sheet feeder high speed continuous strip simulator provides a series of ten separate liquid holding tanks over each of which transverse vortex manifolds 110 are mounted between a pair of Z rails 11 with vortex cups 112 adapted to discharge liquid from each individual tank pumped up through supply lines 113 to overpassing metal sheets 114 on the underside of carrier sled 115 supported by hangers 116 sliding on plastic rails 117 and driven by cable 118 in a forward direction through attachment 119 to carrier bracket 120 and driven in a return direction by attachment 121 at the other end of the cable.
- the drive cable extends around drive pulley 121 at the forward end of the sheet feeder and idler pulley 122 at the return end with each end on the underside attached to bracket 120.
- the drive pulley is threaded for helical cable engagement with a sufficient number of wraps on each side of center to equal the total length of the sheet feeder so that when the ends of the cable are attached to bracket 120 under tension, the underside will wind on the drive pulley while the sled advances from the idler end to the drive end and the upper side of the cable unwinds from the drive pulley.
- the sled Upon reversal of the drive pulley, the sled is returned to the idler end with similar winding of the upper side and unwinding of the lower.
- the hydraulic pump and drive motor are capable of rapidly accelerating the sled before reaching the first tank to a speed as high as 2700 feet per minute, which is in excess of the maximum plating line speeds.
- a single steel sheet metal blank is held on the underside of the sled by a magnetic surface material which is adequate to hold it securely in passing over vortex diffusers selectively actuated by control panel 123 to energize individual station pumps, not shown, for individual liquid holding tanks.
- Sample sheets having typical soil conditions can ' -.hereby be passed over cleaning, scrubber, rinsing, pickling, plating and any other optional vortex diffuser processing tanks to simulate, on one side only, the processing typical of both sides in a continuous steel strip plating line.
- containment of liquid between individual tanks is accomplished by upper and lower containment brushes 124 on both sides of the sled, together with fixed containment s ' ' ields 125 in lieu of exit and entrance liquid knives, preferably employed in the Strip Tech Modules.
- a moving belt test stand is also employed with a stainless steel or clear plastic endless belt 126 adapted to pass under a vortex manifold 127 and liquid kn-'f ⁇ - ⁇ 128 within a clear plastic enclosure 129 which enables a vi r to observe the vortex action and liquid knife action in a manner simulating a continuous steel strip plating line.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/590,558 US5188135A (en) | 1990-02-23 | 1990-09-28 | Method and apparatus for processing sheet metal blanks and continuous strip |
US590558 | 1990-09-28 | ||
PCT/US1991/006764 WO1992005886A1 (en) | 1990-09-28 | 1991-09-18 | Method and apparatus for processing continuous strip sheet metal |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0550667A1 EP0550667A1 (en) | 1993-07-14 |
EP0550667A4 true EP0550667A4 (en) | 1993-09-08 |
EP0550667B1 EP0550667B1 (en) | 1997-05-07 |
Family
ID=24362713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91918772A Expired - Lifetime EP0550667B1 (en) | 1990-09-28 | 1991-09-18 | Method and apparatus for processing continuous strip sheet metal |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0550667B1 (en) |
AU (1) | AU8764691A (en) |
DE (1) | DE69126031T2 (en) |
WO (1) | WO1992005886A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3108025A (en) * | 1961-11-30 | 1963-10-22 | Gen Kinetics Inc | Method and apparatus for cleaning strip material |
US4270317A (en) * | 1978-10-10 | 1981-06-02 | Midland-Ross Corporation | Apparatus used in the treatment of a continuous strip of metal and method of use thereof |
EP0443380A2 (en) * | 1990-02-23 | 1991-08-28 | B.W.- Vortex, Inc. | Method and apparatus for processing metal blanks |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3782791A (en) * | 1971-03-17 | 1974-01-01 | Udylite Corp | Vortex diffuser fluid bearing device |
US3957599A (en) * | 1974-10-02 | 1976-05-18 | Oxy Metal Industries Corporation | Process for electrowinning |
JPS60798B2 (en) * | 1981-06-09 | 1985-01-10 | 株式会社石井表記 | Ultrasonic cleaning device |
DE3629894A1 (en) * | 1986-08-29 | 1988-03-03 | Mannesmann Ag | SYSTEM FOR THE SURFACE TREATMENT OF CONTINUOUSLY CONTINUOUS TAPES, IN PARTICULAR BEATING SYSTEM |
US4788992A (en) * | 1987-04-28 | 1988-12-06 | Lewis Corporation | Ultrasonic strip cleaning apparatus |
-
1991
- 1991-09-18 DE DE69126031T patent/DE69126031T2/en not_active Expired - Fee Related
- 1991-09-18 AU AU87646/91A patent/AU8764691A/en not_active Abandoned
- 1991-09-18 WO PCT/US1991/006764 patent/WO1992005886A1/en active IP Right Grant
- 1991-09-18 EP EP91918772A patent/EP0550667B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3108025A (en) * | 1961-11-30 | 1963-10-22 | Gen Kinetics Inc | Method and apparatus for cleaning strip material |
US4270317A (en) * | 1978-10-10 | 1981-06-02 | Midland-Ross Corporation | Apparatus used in the treatment of a continuous strip of metal and method of use thereof |
EP0443380A2 (en) * | 1990-02-23 | 1991-08-28 | B.W.- Vortex, Inc. | Method and apparatus for processing metal blanks |
Non-Patent Citations (1)
Title |
---|
See also references of WO9205886A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69126031D1 (en) | 1997-06-12 |
EP0550667B1 (en) | 1997-05-07 |
AU8764691A (en) | 1992-04-28 |
EP0550667A1 (en) | 1993-07-14 |
WO1992005886A1 (en) | 1992-04-16 |
DE69126031T2 (en) | 1997-08-14 |
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