US3451903A - Conductor roll and method of making the same - Google Patents

Conductor roll and method of making the same Download PDF

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Publication number
US3451903A
US3451903A US538393A US3451903DA US3451903A US 3451903 A US3451903 A US 3451903A US 538393 A US538393 A US 538393A US 3451903D A US3451903D A US 3451903DA US 3451903 A US3451903 A US 3451903A
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US
United States
Prior art keywords
shell
roll
copper
conductor
bosses
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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
US538393A
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English (en)
Inventor
Shuro Matsuoka
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Filing date
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Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C25D7/0657—Conducting rolls
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00—Electroforming
    • C25D1/02—Tubes; Rings; Hollow bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49865—Assembling or joining with prestressing of part by temperature differential [e.g., shrink fit]

Definitions

  • An electrically conductive roller includes a pair of axially spaced shafts each having a widened portion or bos which is arranged at respective ends of an electroformed copper roller cylinder or shell.
  • the bosses are fixed to the shell by a shrinkage fit and the outer surface of the shell is plated with an abrasion and corrosion-proof metal.
  • the conductive roll is manufactured by the electrodeposition of pure copper over a cylindrical conductor in order to form a layer of relatively great thickness. The conductor is then removed from the deposited copper to provide the outer copper shell.
  • the inner and outer surfaces of the copper shell are then finished to the desired dimensions by machining and shaft elements having bosses are secured into the respective ends of the shell by means of a shrinkage fit preferably with the temperature maintained not higher than 200 C. Thereafter, the outer surface of at least the shell is electro-plated with an abrasion and corrosion resistant metal.
  • This invention relates in general to the construction of electrically conductive rollers or rolls and to a method of making such rollers and in particular to a new and useful electrically conductive roller made with separate end shafts having bosses thereon upon which a cylindrical shell of pure copper is fitted and including a plating over the shell and the sides of the end bosses of an abrasion and corrosion proof metal.
  • This invention has particular application in respect to the formation of conductor rolls for supplying an electric current to a metal piece during the continuous electrochemical treatment thereof, for example, to effect the cleaning, pickling or electroplating of metal such as steel strips.
  • Conductor rolls heretofore in use have a roll shell which is made of a metal having high electric and thermal conductivities such as copper.
  • the material should be of high purity and also as hard as possible in order to extend the roll life and in particular to increase the pressure resistance of the roll surface.
  • many of conventional conductor rolls comprise each a shell of seamless copper pipe of large size manufactured, for example, by the Mannessman rolling process.
  • the shell is supported by bosses of copper alloy or of steel press-fitted or welded to the both ends of the shell, and main shafts are fitted in the center of the shell, the shell being plated with chrome or nickel on the circumferential surface.
  • the large size copper pipes have low hardness and low yield point because they are formed at elevated temperatures, and moreover, the shell becomes softer when it is welded to the bosses.
  • Roll shells formed of such copper pipes therefore fail to have a sufficient durability.
  • the low pressure resistance of shells tends to cause dents 0r deformations.
  • numerous pinholes on the surface of such rolled copper pipes exist for the pipes have minute pinholes inside. Shells of this kind are not satisfactory either in respect to the purity of the copper material or in respect to their surface conditions.
  • Still another method of making conductor rolls has been proposed which consists of fixing a steel drum to a steel shaft with end supporters, enclosing the shaft, supporters, and drum in a casing of cast copper which has a relatively great wall thickness, and then plating the casing surface with copper and chrome to form a plurality of thin plated layers.
  • Rolls produced in this way have a relatively great structural strength.
  • they are composed essentially of cast copper, they are practically as defective as the above-described cast-copper pipes in respect to pressure resistance of the roll surface and electric conductivity.
  • the roll shell has an internal layer of steel, heat transfer to the inner cooling zone is not adequate and the cooling efiect attained on the roll surface is insufficient.
  • the defects of the prior art structures are avoided and there are provided conductor rolls having a roll shell formed of hard, dense and pure copper with a very limited amount of impurities, and having very good electric conductivity with adequate cooling means.
  • a roll shell is provided with great pressure resistance, which is free from pinholes, blowholes and other defects in the surface and sub-surface layer of the roll.
  • the invention includes a conductor roll which comprises a shell, a pair of main shafts, and a pair of bosses fixed to the main shaft for supporting the shell concentrically to the shafts.
  • the shell consists of an electro-formed cylinder of pure copper.
  • the shell alone or both the shell and bosses are covered by an abrasionand corrosion-proof metal such as hard chrome or nickel.
  • a further object of the invention is to provide a conductor roll including a shell of an electro-formed cylinder of pure copper fitted over bosses carried by axially spaced shaft elements and with a plated coating of an abrasion and corrosion resistant metal over at least the shell.
  • a further object of the invention i to provide a method of manufacturing a conductor roll comprising electrodepositing pure copper to form a cylinder, finishing the inner and outer surfaces of the cylinder, fitting the cylinder over end bosses of main shafts and plating at least the cylinder with an abrasion and corrosion resistant metal.
  • a further object is to provide a conductor roll which is simple in design, rugged in construction and economical to manufacture.
  • FIG. 1 is a longitudinal sectional view of a conductor roll embodying the invention
  • FIGS. 2 and 3 are respective longitudinal sectional views of two other embodiments of the invention.
  • FIG. 4 is a perspective view illustrating a method of manufacturing a conductor roll in accordance with the invention.
  • FIG. 1 includes a conductor roll 50 formed of axially spaced main shafts 1 and 1a provided with respective central passages 2, 2a for cooling water.
  • a boss or drum support 3 of copper alloy castings are secured to the respective main shafts 1 and 1a.
  • the bosses 3, 3 include axial hub portions 4, 4 having outer ends which are soldered as shown at 5, 5 so as to be water-tight.
  • Copper disks or plates 6, 6 are soldered or welded to the inner ends of the main shafts 1 and 1a, respectively.
  • the disks 6, 6 are each provided with a plurality of holes or through passages 7, 7 for circulating cooling water in the vicinity of the outer periphery of each plate.
  • a roll shell 8 which is electro-formed from pure copper by the method described hereafter is fitted over the spaced bosses 3, 3 and secured thereon by shrinkage fit.
  • the outer surface of the shell 8 and those of the bosse 3, 3 are further plated with hard chrome or nickel 9.
  • the main shaft 1 is provided with a cross passage 10 which receives water from the inlet passage 2 and delivers it into the drum space as needed for cooling.
  • An outlet pipe 10a for discharging cooling water is fixed to the opposite shaft 1a and communicates with the outlet passage 2a.
  • watertight rings 11, 11 held by respective retainer plates 12, 12 which are bolted on the end surface of the bosses 3, 3 as shown in FIG. 2, or solderings or low temperature brazings 13, 13 are provided on the circumferential juncture of the end surface of the shell 8 and the bosses 3, 3 as shown in FIG. 3, so that more assurance of water tightness inthe roll is obtained.
  • a cylindrical conductor is made by winding a copper plate 15 about 0.5 millimeter in thickness around the circumference of a cylindrical core 14 e.g. of wood, as shown in FIG. 4, and fixing the copper plate 15 to the cylindrical core 14 with nails 16, 16. The exposed nail heads and the overlapped portion of the copper plate are covered with solder.
  • the cylindrical conductor is dipped in a plating bath and is revolved therein for thick electro-deposition with pure copper. When the deposit has obtained a predetermined thickness, the cylindrical conductor is taken out of the bath, and the core 14 with the end plates 17, 17 are removed leaving the copper plate 15 behind, and then copper plate 15 is removed by mechanical cutting.
  • the cylindrical core 14 may comprise any of certain materials which can be relatively readily broken and removed, for example, synthetic resin, wood etc. and carbon black powder or the like may be applied thereon as an electrode extending over the circumferential surface of said cylindrical core 14 instead of the metallic plate 15 as above mentioned.
  • an alkaline plating bath prepared from an aqueous solution of sodium cyanide or potassium cyanide and cuprous cyanide with the addition of a suitable brightening and reveling agent such as potassium thiocyanate and potassium tartrate.
  • a suitable brightening and reveling agent such as potassium thiocyanate and potassium tartrate.
  • bosses 3, 3 and disks 6, 6 fixed to main shafts 1 are tightly shrinkage-fitted into the shell 8 as shown in FIGS. 1 to 3. Finally the periphery of the shell and bosses are plated with hard chrome or nickel.
  • both welding and low temperature brazing are not desirable because the former causes softening of the shell and the latter does not permit firm fixing.
  • shrinkage fit it is important to heat the shell 8 to a temperature not higher than 200 C., in order to avoid Softening of the shell.
  • the invention is very useful from the industrial of mechanical properties, especially in hardness and yield standpoint. point which have a close relation to deformation of the 25 While specific embodiments of the invention have been roll surface, the copper base of the roll shell of the inshown and described in detail to illustrate the application vention has a hardness 1.6 to 3 times greater than that of of the inventive principles, it will be understood that the conventional copper plate a d r ll d copper pipe, nd invention may be embodied otherwise without departing is 3 to 6 times greater in yield point. With these prop- 30 from Such P p erties, the pressure resistance of the roll surface and What is claimed is:
  • a conductor roll comprising a shell, a pair of main creased resulting in a very long service life of the roll, f and a S fi to e of Said Shafts a forming and the maintenance cost can be considerably reduced bea Supporting Surface for Supporting Said Shell concencause repairing times of chrome plated surface are rely to said Shafts, d shell comprising an electrocreased at least one third of those of conventional rolls.
  • the copper base confittains only traces of such other elements as phosphorus, 4 A Conductor r011, according to claim including a silicon, arsenic, and iron which affect the conductivity of waterjtight g located at the Circumftirential j t copper seriously when each of them is present in an of Sald Shell With a h f said bosses. amount of only 0.02 percent or more as foreign matter.
  • the copper UNITED ST ATES PATENTS base of shell consisting of electro-formed pure copper has 2,754,485 7/1956 Wlck et a1 204 279 a very dense structure and is free from any blowholes 2958742 11/1960 Palmer 204 279 which are usually found in cast copper.
  • the roll 2975110 3/1961 h 204 9 surface has neither pinhole, blowhole nor other hollow 3374165 3/1968 OBnen et a1 204*279 defects, permitting very satisfactory finishing by hard FOREIGN PATENTS chrome plating or nickel p 453,644 12/1948 Canada.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Rolls And Other Rotary Bodies (AREA)
US538393A 1965-04-09 1966-03-29 Conductor roll and method of making the same Expired - Lifetime US3451903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2093165 1965-04-09

Publications (1)

Publication Number Publication Date
US3451903A true US3451903A (en) 1969-06-24

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US538393A Expired - Lifetime US3451903A (en) 1965-04-09 1966-03-29 Conductor roll and method of making the same

Country Status (6)

Country Link
US (1) US3451903A (en:Method)
CH (1) CH453840A (en:Method)
DE (1) DE1496922B2 (en:Method)
ES (1) ES325787A1 (en:Method)
GB (1) GB1134195A (en:Method)
NL (1) NL6604880A (en:Method)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905400A (en) * 1970-11-13 1975-09-16 Xerox Corp Electroforming mandrel
US3927463A (en) * 1972-06-23 1975-12-23 Xerox Corp Method of making a cylindrically shaped, hollow electroforming mandrel
US3950839A (en) * 1972-06-23 1976-04-20 Xerox Corporation Method of making an electroforming mandrel
US5247884A (en) * 1991-12-10 1993-09-28 K. Walter Service Corporation Methods and apparatus for forming printing cylinders, and the resulting ballard shells and printing rolls
US20120028772A1 (en) * 2009-03-12 2012-02-02 Sandvik Intellectual Property Ab Roller comprising a drive shaft and a roller ring, as well as a method for assembling such a roller

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2613683A1 (de) * 1976-03-31 1977-10-20 Kabel Metallwerke Ghh Stromleitwalze zur uebertragung hoher elektrischer stroeme
DE4142952C1 (en:Method) * 1991-12-24 1993-04-08 Rasselstein Ag, 5450 Neuwied, De
CN103031579B (zh) * 2011-09-29 2015-05-27 西安航空动力股份有限公司 防止航空发动机球面轴承尖角镀铬层脱落的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA453644A (en) * 1948-12-28 Carnegie-Illinois Steel Corporation Contact roll for electroplating
US2754485A (en) * 1949-12-23 1956-07-10 Bethlehem Steel Corp Contact roll for electrolytic tin lines
US2958742A (en) * 1956-03-08 1960-11-01 United States Steel Corp Conductor roll and method of making the same
US2975110A (en) * 1957-08-12 1961-03-14 Elmore S Metall Ag Process for the production of electric conductor material from copper having high conductivity
US3374165A (en) * 1965-02-18 1968-03-19 Electro Coatings Conductor roll

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA453644A (en) * 1948-12-28 Carnegie-Illinois Steel Corporation Contact roll for electroplating
US2754485A (en) * 1949-12-23 1956-07-10 Bethlehem Steel Corp Contact roll for electrolytic tin lines
US2958742A (en) * 1956-03-08 1960-11-01 United States Steel Corp Conductor roll and method of making the same
US2975110A (en) * 1957-08-12 1961-03-14 Elmore S Metall Ag Process for the production of electric conductor material from copper having high conductivity
US3374165A (en) * 1965-02-18 1968-03-19 Electro Coatings Conductor roll

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905400A (en) * 1970-11-13 1975-09-16 Xerox Corp Electroforming mandrel
US3927463A (en) * 1972-06-23 1975-12-23 Xerox Corp Method of making a cylindrically shaped, hollow electroforming mandrel
US3950839A (en) * 1972-06-23 1976-04-20 Xerox Corporation Method of making an electroforming mandrel
US5247884A (en) * 1991-12-10 1993-09-28 K. Walter Service Corporation Methods and apparatus for forming printing cylinders, and the resulting ballard shells and printing rolls
US20120028772A1 (en) * 2009-03-12 2012-02-02 Sandvik Intellectual Property Ab Roller comprising a drive shaft and a roller ring, as well as a method for assembling such a roller

Also Published As

Publication number Publication date
ES325787A1 (es) 1967-03-01
DE1496922B2 (de) 1971-07-22
DE1496922A1 (de) 1970-02-05
CH453840A (de) 1968-03-31
GB1134195A (en) 1968-11-20
NL6604880A (en:Method) 1966-10-10

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