US3688548A - Apparatus for the manufacture of aluminum strip conductors - Google Patents

Apparatus for the manufacture of aluminum strip conductors Download PDF

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Publication number
US3688548A
US3688548A US40598A US3688548DA US3688548A US 3688548 A US3688548 A US 3688548A US 40598 A US40598 A US 40598A US 3688548D A US3688548D A US 3688548DA US 3688548 A US3688548 A US 3688548A
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United States
Prior art keywords
reshaping
strip
roll
rolls
pair
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Expired - Lifetime
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US40598A
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English (en)
Inventor
Shigenori Kawaguchi
Yoshioki Toi
Shiyozo Suyama
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MA Aluminum Corp
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Mitsubishi Aluminum Co Ltd
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    • 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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/005—Edge deburring or smoothing

Definitions

  • This invention relates to apparatus for reshaping both edges of an aluminum strip of 02-300 mm. in thickness into rounded smooth edges adapted for an electric conductor.
  • the edge of the strip has irregular burrs resulting from slitting of the aluminum strip of commercial width.
  • the strip is pulled from its coiled supply, through a three-roll assembly, engaged with the groove of the reshaping rolls, through a cleaning chamber, and finally to a recoiler to be coiled again.
  • the reshaping roll is urged by fluid pressure toward the edge so as to treat it with a relatively weak force in order to prevent the roll from damaging the strip.
  • This invention relates to an apparatus for the manufacture of an aluminum strip conductor, more particularly, to the apparatus for the manufacture of a high purity aluminum strip conductor adapted for an electric transformer and other electromagnetic devices.
  • the copper resources all over the world have dwindled so noticeably that a great deal of aluminum is used as a substitute metal for copper.
  • aluminum is much more abundant than copper, so aluminum is used as one of principal industrial metallic materials.
  • the aluminum strip conductor when employed as a material for electromagnetic coils or windings for electric transformers and other electromagnetic devices, it is a common practice to form a coil wound with an aluminum strip in place of the coil wound with round aluminum wire.
  • the coil of this invention is wound with an aluminum strip wider than wire.
  • aluminum strip for coils has several advantages as follows: 1) Electric conductivity of aluminum is about 61 percent that of copper while its weight is one-third that of copper, hence the weight of aluminum with the same electric resistance is about half that of copper; 2) Rapid winding is possible, because aluminum is softer and more workable than copper so that the form of a coil is easily made 3) Better heat transfer.
  • the cooling surface is limited to a wire at every end of a layer, but in the strip wound aluminum coil, it is cooled by a cooling agent at every end of a layer, its cooling effect is high; 4) Less need for an electric insulating material.
  • the cross section area of aluminum should be 1.6 times as big as that of copper, but it will be covered by the strip wound aluminum coil ofa good design. Voids and thick insulating layers heretofore observed in the conventional coil wound with copper wire are eliminated owing to the low voltage between layers as well as the absence of inner cuts resulting from roll winding.
  • the strip wound aluminum coil of the good design has almost the same space factor as that of the coil wound with copper wire, because in the former there is less space occupied by the insulating material; and 5) in view of the above features, the price of good-designed strip wound aluminum coils can be reduced by 5-10 percent from that of an electrically equivalent coil wound with copper wire, and aluminums future availability is much better than copper so that price stability of the finished price is maintained.
  • a plurality of aluminum strip conductors ofa width are obtained by slitting an elongated aluminum sheet or strip of commercial width.
  • sharp projections or burrs of microscopic dimensions are formed on the edges of the aluminum strip.
  • these burrs must be removed to provide rounded smooth edges thereon, because when a coil is produced by coiling the aluminum strips with an electric insulation material, such as, insulation paper, interleaved between the turns, the irregular burrs tend to damage the paper so that a completed coil would be a bad one.
  • An electric transformer having the coil produced from the aluminum strip conductor therein includes a pole transformer and a welding transformer rated 15-100 kVA (kilovolt-ampere), both of which show good results. Accordingly, the range of application of the aluminum strip conductor is widening to a transformer rated 500-1000 kVA.
  • the present invention contemplates to overcoming the above problem providing a mechanical process in which convex smooth edges are obtained by subjecting the irregular burrs to a mechanical working operation including an improved reshaping roll.
  • FIG. 1 is a diagrammatic view showing a section of a preferred embodiment of the apparatus for reshaping the edge portions of an aluminum strip conductor together with its operation.
  • FIG. 2 is a top plan view of FIG. 1 together with its pneumatic system.
  • FIG. 3 is a perspective view of the essential parts of the apparatus of the invention.
  • FIG. 4 is a perspective view of a set of reshaping rolls and a fluid pressure means.
  • FIG. 5 is a side view of FIG. 4 together with a slide means with its feed handle.
  • FIG. 6 is a vertical section of a reshaping roll having a V-shaped groove which is to be engaged with an edge portion of aluminum strip wherein the groove forms equal angles a above and below the horizontal center line of the roll.
  • FIG. 7 is a vertical section of another reshaping roll having a U-shaped groove which is to be engaged with an edge portion of aluminum strip wherein the groove forms equal angles B above and below the horizontal center line of the roll, showing a rounded apex of the angle ,8.
  • FIG. 8 is a perspective view of an enlarged edge portion of aluminum strip showing several locations which are described in the text.
  • FIG. 9 shows an enlarged view of an example of an edge portion of strip immediately after slit.
  • FIGS. 10-12 show how the edges are reshaped by the rolls of the invention, and FIG. 12 shows a finished edge.
  • FIG. 13 is a perspective view of the strip wound aluminum coil, partly in section, showing the undarkened portion as an insulating material.
  • FIG. 14 is a perspective view of a coil wound with round copper wire, partly in section, showing an insulating material around the round copper wire.
  • FIG. 15 is a section of a degreasing and cleaning chamber wherein the aluminum strip conductor processed by this invention is cleaned prior to the final recoiling step.
  • the purity of aluminum to be processed is 99.0 percent preferably 995 percent or more, and we adopt such aluminum materials as of 0.20-3.00 mm. in thickness and 80800 mm. in width. It is to be understood that these values are exemplary and this invention should not be limited by them. Particularly, in the width, an aluminum sheet of less than 80 mm. or more than 800 mm. is satisfactory for carrying out our invention.
  • the invention provides a process and apparatus for reshaping the edge portions of aluminum strip just slit by causing them to be engaged with an improved reshaping roll while moving the strip continuously under tension.
  • a coiled supply 10 of an aluminum strip having rough edges as well as the above range of dimensions is mounted at one end of the apparatus.
  • the invention can treat the rough edges of materials other than aluminum in accordance with the selection of a suitable reshaping roll.
  • the aluminum strip S removed from the supply I0 passes through a three-roll assembly 3 consisting of three rolls, the number of which will not be limited.
  • An intermediate roll of the three-roll assembly can be elevated by utilizing the fluid pressure system, which is shown in FIG. 3 in connection with FIG. 2.
  • each roll of the three-roll assembly is made of a cylindrical body of carbon steel, about 75 mm in diameter and about one meter, in length the surface of which is treated with a suitable agent.
  • the three-roll assembly 3 serves to prevent the aluminum strip from buckling prior to causing it to be engaged with the reshaping roll 4.
  • the threeroll assembly 3 will not be able to impart a noticeable stress to the aluminum strip.
  • the three-roll assembly is not given a particular force.
  • the construction of the three-roll assembly is known in the art. As shown in FIGS.
  • the three-roll assembly 3 is provided at four locations: before the first reshaping roll, between the first and second reshaping rolls, between the second and third reshaping rolls, and after the third reshaping roll 4, respectively. They are of the same construction, and the intermediate roll can be elevated up and down by means of a fluid pressure system. When the strip S passes, the intermediate roll descends down to a space between two rolls so that the three rolls are then in parallel. The strip S travels through the three-roll assembly in a zigzag path.
  • pairs of reshaping rolls 4 are provided in a vertical position to the plane of the strip at three locations along both edges of the strip. It is seen that the total number of reshaping rolls 4 is 12. It is understood that the total number of reshaping rolls will not be limited.
  • the reshaping rolls can be moved transversely across the width of the strip S.
  • the reshaping rolls on opposite edges of the strip can be moved toward and away from each other (FIG. 2).
  • slide means 8 is provided (FIG. 3). This slide means 8 is known in the art and it is operated by a feed handle 9 connected to a feed screw.
  • FIG. 3 shows two essential parts of the apparatus, the three-roll assembly 3 and the reshaping roll 4.
  • the reshaping roll 4 is constructed as a two-roll unit to which fluid pressure is applied.
  • the reshaping roll may of a single roll, the details of which will be described hereinafter.
  • the reshaping roll 4, an upper block 6, a lower block 7, slide means 8, and a fluid pressure piston-and-cylinder 5 are shown in FIGS. 3 and 4.
  • each of the rolls is rotatably mounted by means of a pin 16 with a suitable bearing (not shown) on the upper block 6, to which the pin 16 is secured.
  • the upper block 6 is pivotally mounted on the lower block 7 around a stud bolt 19 secured thereto.
  • the diameter of the bolt 19 is somewhat less than a central bore of the upper block 6 so that the block 6 can be removed from the lower block 7 while swingable.
  • the lower block 7 is connected to the slide means 8 of known construction, the description of which is omitted.
  • the reshaping roll 4 of the above construction is connected to the fluid pressure piston-cylinder 5 which urges the roll 4 toward the edge of the aluminum strip.
  • fluid pressure may read about 0.7-1.4 kg./ cm*. at a pressure control means 25 (FIG. 2). If the fluid pressure at 25 shows the above range, it follows that, a working force of about 30-70 kg will be produced at the reshaping roll depending upon the size and capacity of piston-cylinder. However, it is very difficult to determine accurately an actual surface area of one edge portion of strip, so the above contact pressure per unit area is a mere conjecture. It seems that at least the fluid pressure of 10 kg./ mm (per sq. millimeter) may be produced.
  • the present inventors have discovered based on an extensive experiment that the working force applied to the edge of a strip is satisfactory when the fluid pressure control means 25 indicates in the range of 0.7-1.4 kg./ cm (per sq. centimeter).
  • the fluid pressure control means 25 indicates in the range of 0.7-1.4 kg./ cm (per sq. centimeter).
  • air we have adopted air from an economical point of view, but it is to be understood that any working fluid other than air, for example, oil may be used.
  • the reshaping roll has dimensions of mm. in diameter and 60 mm. in height in this preferred embodiment, but this dimension will be exemplary, not limiting.
  • a single roll adapted for reshaping instead of two rolls shown in the drawing may be used.
  • a single block instead of the upper and lower blocks mentioned above may be employed.
  • Other necessary means therefor would be obvious to any one skilled in the art.
  • the aluminum strip S moves toward a recoiler 11 while being treated by a series of reshaping rolls.
  • a driving force for advancing the strip is given only by a pulling force of the recoiler 11.
  • a recoiling speed of the strip is about 4.5-90 m./min., in which case the tension of the strip is at most 2,000 kg. at the speed of 4.5 m./min.
  • This tension is obtained by the difference of power between two motors, one motor for the uncoiler is 22 kW/hr. while the other for the spool 11 is 30 kW/hr. This is exemplary, not limiting.
  • the strip having completely reshaped edges enters a degreasing and cleaning chamber of known constructionin FIG. 15, in which the strip S is sprayed on both sides thereof with a degreasing solvent, such as, trichloroethylene, from a group of spray nozzles 21 to remove rolling oil which remains from the previous rolling operation from ingot to sheet, chips, turnings and kerosene as a lubricant in this invention.
  • a degreasing solvent such as, trichloroethylene
  • the strip treated with solvent is subjected to brushing by a circular brush 22 mounted on the roll, passes through a pair of rubber rolls, and is wiped off by a rubber wiper 23.
  • the cleaned strip is coiled on the recoiler 11.
  • the chamber 20 does not form a part of the invention.
  • the intermediate roll of the three-roll assembly as well as the reshaping roll, the essential part of the apparatus can be moved by the use of air pressure.
  • the first set of reshaping rolls (two on both sides, four in all) is provided with a pressure control means 25 and the second and third sets are also provided with the same means 25, respectively.
  • the pressure control means 25 is known in the art and provided with an air filter (not shown).
  • four units of the threeroll assembly are installed in the apparatus, and a single pressure control means 26 with an air filter is provided.
  • An air compressor 13 supplies compressed air through a conduit 12 to a number of units desired.
  • the aluminum strip S is engaged with the groove of each reshaping roll 4, and any strip having a width in the range of 80-800 mm. can be accommodated in this apparatus.
  • the slide means 8 is moved by the feed means 9.
  • compressed air is supplied to the air cylinder 5 connected to the lower block 7 to urge it, whereby compressed air is transmitted to the upper block 6 which is pivotally mounted about the bolt 19 on the block 7.
  • the reshaping roll 4 is urged toward the edge of strip engaged into the groove thereof to treat it.
  • the reason why the upper block 6 on which the reshaping rools 4 are mounted is swingably portion shown in FIG. 8 should be in the range specified:
  • T is the thickness of the strip.
  • FIGS. 6-7 Two kinds of a reshaping roll shown in FIGS. 6-7.
  • One reshaping roll 4 in FIG. 3 is a steel roll, which, as an example, has a diameter of mm., and a height of 60 mm. It has a groove about 20 mm. deep around the horizontal center line thereof.
  • the reshaping roll of FIG. 6 refers to a V-shaped groove roll while that of FIG. 7 to a U-shaped groove roll.
  • the V-shaped groove forms an angle a above and below the horizontal center line of the roll while the U-shaped groove in FIG. 7 forms an angle B above and below the same line, but its apex forms an arc.
  • the angles and the radius of the are shown below as exemplary. These values have been obtained after many experiments.
  • the angle a lies in the range of -30 while B l20.
  • the radius R within the angle a at 20 mm. from the side of the roll in FIG. 7 lies in the range of 0.05-0.7 mm.
  • R 0.l mrn.
  • R 0.4 mm.
  • R 0.l5mm
  • R 0.5mm.
  • R 0.2 mm.
  • R 0.6 mm.
  • the value R can be combined with any angle within the angle B, hence the number of combinations may be more than 100.
  • FIGS. 1-2 The arrangement of three sets of reshaping rolls 4 on both edges of strip is shown in FIGS. 1-2, and the arrangement of reshaping rolls having V-shaped and U- shaped grooves in the above sets is shown as exemplary in Table 1.
  • A. angle R. radius As shown in Table I, the first roll having a V-shaped groove has the angle and the second I0". Generally speaking, the rolls to follow have smaller angles. In treating the edge, the rough edge of FIG. 9 was treated to the condition of FIG. 10 by the first and second rolls, then to that of FIG. 11 by the third and fourth rolls, and finally to the completed condition of FIG. 12 by the fifth and sixth rolls.
  • the fluid pressure system particuiarly, air pressure, is employed to apply a working force to the reshaping roll.
  • the pneumatic system has been proved to be an ideal means for applying a force required to work both edges of strip of the above range of thickness.
  • an apparatus for reshaping the edges of an aluminum strip conductor wherein said strip is moved from a supply roll to a recoil roll while said edges are pressed by a plurality of grooved reshaping rolls, said apparatus including a base frame, at least one pair of reshaping roll assemblies mounted in opposing fashion on said base frame and movable thereon toward one another to press said strip therebetween; the improvement wherein said at least one pair of reshaping roll assemblies comprises a first pair of reshaping roll assemblies, each of the rolls of which have therein a V- shaped groove with angles of l-3() above and below the horizontal center line thereof; and a second pair of reshaping roll assemblies, each of the rolls of which have therein a U-shaped groove with angles of l20 above and beiow the horizontal center line thereof; and forming an are at the apex thereof having a radius of from 0.050.7 mm.
  • each of said reshaping roll assemblies comprising slide means mounted on said base frame for movement in a direction transverse to the movement of said strip, a lower block mounted on said slide means and movable in said direction, fluid pressure means operably connected to said lower block for sliding said lower block in said direction, a stud bolt pivotally mounted in said lower block and extending upwardly therefrom, an upper block attached to said stud bolt and mounted above said lower block, said rolls rotatably mounted on said upper block, whereby said rolls of each of said reshaping roll assemblies may be selectively pressed against said edges of said strip.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Metal Rolling (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
US40598A 1969-06-03 1970-05-26 Apparatus for the manufacture of aluminum strip conductors Expired - Lifetime US3688548A (en)

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CA (1) CA921295A (de)
DE (1) DE2027052A1 (de)
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GB (1) GB1302258A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757556A (en) * 1971-03-17 1973-09-11 Nippon Kokan Kk Method of roughing slab to predetermined width and apparatus thereof
US4285227A (en) * 1979-05-30 1981-08-25 Nhk Spring Co., Ltd. Edge roll assembly for manufacturing a taper leaf spring
EP0190958A2 (de) * 1985-01-30 1986-08-13 Motor Wheel Corporation Verfahren und Vorrichtung zum Vorbereiten des Randes von Fliessdrehrohlingen
US5592845A (en) * 1993-06-08 1997-01-14 Pennington Metals, Inc. Process for producing bar flats
US20080194127A1 (en) * 2005-02-03 2008-08-14 Auto Kabel Managementgesellschaft Mbh Electrical Flat Strip Conductor For Motor Vehicles
US20090104514A1 (en) * 2006-10-24 2009-04-23 Auto Kabel Managementgesellschaft Mbh Battery Lead
CN101128888B (zh) * 2005-02-03 2012-05-02 自动电缆管理有限责任公司 用于机动车辆的带状电气导线及其制造方法和应用
CN102716940A (zh) * 2012-06-06 2012-10-10 芜湖鑫泰铜业有限公司 一种铜带左右压平矫正装置

Families Citing this family (6)

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DE2710575C3 (de) * 1977-03-11 1979-09-06 Sundwiger Eisenhuette Maschinenfabrik Grah & Co, 5870 Hemer Walzeinrichtung zum Glätten der Streifenkanten eines in eine Vielzahl von Streifen längsgeteilten Bandes
GB8709246D0 (en) * 1987-04-16 1987-05-20 Steels Ltd A T Dressing workable strip material
WO2014113050A1 (en) * 2013-01-16 2014-07-24 Poliquin Richard A steel component and method and system for making the same
DE102015108305A1 (de) * 2015-05-27 2016-12-01 Thyssenkrupp Ag Vorrichtung zur spanlosen Kantenbearbeitung eines Blechs und Verfahren zur spanlosen Kantenbearbeitung eines Blechs
DE102017111320A1 (de) 2017-05-24 2018-11-29 Mkm Mansfelder Kupfer Und Messing Gmbh Wickelvorrichtung zum Wickeln eines Leistungstransformators
CN111168814B (zh) * 2020-01-14 2021-06-08 佛山市金福板业有限公司 一种增强纤维板坯体生产方法

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US3006401A (en) * 1957-10-23 1961-10-31 Acme Steel Co Apparatus for conditioning metal strip having non-uniform stresses therein
US3323342A (en) * 1965-03-31 1967-06-06 Coil Anodizers Inc Method and means for smoothing edges of strip material
US3336778A (en) * 1964-06-08 1967-08-22 Anaconda Wire & Cable Co Edge-forming apparatus and method
US3367162A (en) * 1965-04-07 1968-02-06 United States Steel Corp Apparatus for reducing slab width
US3513677A (en) * 1967-08-02 1970-05-26 Natalis H Polakowski Metal strip processing machine

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Publication number Priority date Publication date Assignee Title
US3422656A (en) * 1966-03-18 1969-01-21 United States Steel Corp Method of rolling slabs in planetary mill
US3400566A (en) * 1966-12-13 1968-09-10 Gauer Walter Sheet metal edging apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3006401A (en) * 1957-10-23 1961-10-31 Acme Steel Co Apparatus for conditioning metal strip having non-uniform stresses therein
US3336778A (en) * 1964-06-08 1967-08-22 Anaconda Wire & Cable Co Edge-forming apparatus and method
US3323342A (en) * 1965-03-31 1967-06-06 Coil Anodizers Inc Method and means for smoothing edges of strip material
US3367162A (en) * 1965-04-07 1968-02-06 United States Steel Corp Apparatus for reducing slab width
US3513677A (en) * 1967-08-02 1970-05-26 Natalis H Polakowski Metal strip processing machine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757556A (en) * 1971-03-17 1973-09-11 Nippon Kokan Kk Method of roughing slab to predetermined width and apparatus thereof
US4285227A (en) * 1979-05-30 1981-08-25 Nhk Spring Co., Ltd. Edge roll assembly for manufacturing a taper leaf spring
EP0190958A2 (de) * 1985-01-30 1986-08-13 Motor Wheel Corporation Verfahren und Vorrichtung zum Vorbereiten des Randes von Fliessdrehrohlingen
EP0190958A3 (de) * 1985-01-30 1987-10-07 Motor Wheel Corporation Verfahren und Vorrichtung zum Vorbereiten des Randes von Fliessdrehrohlingen
US5592845A (en) * 1993-06-08 1997-01-14 Pennington Metals, Inc. Process for producing bar flats
US20080194127A1 (en) * 2005-02-03 2008-08-14 Auto Kabel Managementgesellschaft Mbh Electrical Flat Strip Conductor For Motor Vehicles
CN101128888B (zh) * 2005-02-03 2012-05-02 自动电缆管理有限责任公司 用于机动车辆的带状电气导线及其制造方法和应用
US20090104514A1 (en) * 2006-10-24 2009-04-23 Auto Kabel Managementgesellschaft Mbh Battery Lead
US9177695B2 (en) 2006-10-24 2015-11-03 Auto Kabel Managementgesellschaft Mbh Battery lead
CN102716940A (zh) * 2012-06-06 2012-10-10 芜湖鑫泰铜业有限公司 一种铜带左右压平矫正装置

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GB1302258A (de) 1973-01-04
FR2045808B1 (de) 1974-05-03
FR2045808A1 (de) 1971-03-05
CA921295A (en) 1973-02-20
DE2027052A1 (de) 1971-02-25

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