US3746633A - Apparatus for electroplating workpieces including means to vary the position of the workpieces - Google Patents

Apparatus for electroplating workpieces including means to vary the position of the workpieces Download PDF

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Publication number
US3746633A
US3746633A US00128407A US3746633DA US3746633A US 3746633 A US3746633 A US 3746633A US 00128407 A US00128407 A US 00128407A US 3746633D A US3746633D A US 3746633DA US 3746633 A US3746633 A US 3746633A
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United States
Prior art keywords
articles
plated
current
electroplating
supplied
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Expired - Lifetime
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US00128407A
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English (en)
Inventor
A Miyato
H Okubo
C Tomita
A Suzuki
H Ito
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JFE Engineering Corp
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Nippon Kokan 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
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/06—Suspending or supporting devices for articles to be coated
    • C25D17/08—Supporting racks, i.e. not for suspending
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode

Definitions

  • An apparatus for electroplating wherein cathode means are provided to mount a plurality of articles to be plated, there being a mechanism for pressing said articles to be plated to the surfaces of said cathode means during the period of supply of current and a rotating mechanism to vary the position of the articles to which current is supplied while at the same time the supply of current is stopped, the pressing mechanism and the rotating mechanism being connected to an interlocking mechanism so that the supply of current is stopped and the pressure of the pressing mechanism is released before activation of the rotating mechanism.
  • the present invention relates to an apparatus for forming a uniform and sturdy film electroplated on a surface of an article.
  • the article may be a cylindrically-shaped article of various lengths such as a fastener, a bolt, a nail and the like.
  • a barrel type apparatus is used or electroplating, with an aqueous solution, such cylindrically-shaped small articles.
  • An electroplating apparatus of a barrel type has drawbacks; e.g., when applied to fused salt electroplating by electrolysis, the electrical resistance at the point contact of an article or articles to be plated and a cathode or the mutual point contact of articles to be plated is so unstable and great that the area in the region of a part through which current has been supplied remains defectively plated after completion of plating.
  • the article thus electroplated has a poor durability as a whole. It is a known fact from the past experiments by the inventors of this invention that said electroplating apparatus of a barrel type has numerous problems in fused salt electroplating by electrolysis.
  • the present invention relates to an apparatus for use in electroplating articles, in which a pressing mechanism is provided to connect articles to be plated firmly to a cathode in a plating bath, and in addition to said pressing mechanism, a rotating mechanism to rotate articles to be plated is provided.
  • the rotating mechanism is brought into action at predetermined intervals when the pressure of the pressing mechanism is nil.
  • articles to be plated are rotated to change the parts in contact with the cathode to which current is supplied within a short period of time.
  • a supplemental anode may be provided in addition to said two mechanisms.
  • FIG. 1 is a front view of an apparatus embodying the present invention
  • FIG. 2 is a side-sectional view thereof
  • FIG. 3 is a partially enlarged view of the part A in FIG. 1;
  • FIG. 4 is a partially enlarged view of the part B in FIG. 2.
  • a cathodic conductor 2 carrying a plurality of articles to be plated such as fasteners, bolts, nails and the like is supported in a plating bath 6 through a supporter 5 freely and suspendably fixed to a bracket 4 on a lid 28 of a plating vessel 3.
  • the parts '7 mounting the articles to be plated have a wave shape, the variable number of articles 1 to be plated being mounted within the recesses or troughs so formed.
  • two cathodic conductors 2 and 2' are arranged in parallel in a vertical direction in the drawings as if supporting both ends of articles to be plated (see FJG. 2).
  • the number of said cathodic conductors in parallel is proportionate to the size of a plating vessel 3 and may be optionally increased.
  • anodes 8 as shown in FIG. 2 are arranged on the upper portions of both ends and in the lower portion at the centre of the articles 1 to be plated and are fixed to a lid 28 so as to be immersed in a plating bath in order to provide a plating film having a uniform thickness.
  • supplemental anodes 9 may be fixed to a bracket if so required.
  • the ends of article 1 to be plated often have indented parts.
  • the supplemental anodes 9 cause a remarkably efiicient electroplating treatment on the indented parts.
  • a tip of a supplemental anode '9 adjacent an article is plated with a very small distance between the two with the extreme tip of said supplemental anode extending beyond insulation 10.
  • the arrangement of said supplemental anodes *9 is an optional but substantial feature of the present invention.
  • Parts 7 of the cathodic conductors carrying articles 1 to be plated act as the parts to which current is supplied, said parts being partially covered with insulation 11 such as Teflon or the like.
  • insulation 11 such as Teflon or the like.
  • the parts 7 of a cathode where current is supplied are placed horizontally in a plating bath, a pressing mechanism 12 being activated toward articles 1 to be plated whose ends are sustained therebetween.
  • the pressing mechanism presses the articles 1 to be plated to the exposed part of a cathodic part where current is supplied to maintain a firm contact during the supply period for current.
  • the pressing mechanism is not limited to the one illustrated in the drawings. However, as shown in the drawings the pressing mechanism 12 uses resilient rods 14 elongated to a letter J-shape, each rod 14 includes a piano wire 13 sheathed in a Teflon tube 26 and a glass tube 27 provided at the pressing part.
  • the pressing mechanism is located at parts marked C in FIG. 1. The position of the dotted line shown in FIG.
  • a pressing part is so constructed that when a pressure is applied to the articles to be plated utilizing constant elasticity it will be placed on the solid line illustrated in FIG. 3. It is also possible to arrange a magnet (not shown in the drawings) beneath a cathode and activate the magnetism to attract and firmly contact articles to be plated on a surface of the cathode.
  • a rotating mechanism 15 to vary the positions of the articles 1 to be plated in relation to the cathode is provided corresponding to the pressing mechanism 12.
  • the mechanism 15 includes a glass rod 16 arranged in parallel with the horizontal point of the cathodic conductor, both ends of said glass rod being supported by supporting rods 17 and 17, so as to be able to rotate momentarily all of the plurality of articles to be plated mounted in the horizontal direction.
  • the glass rods are rotated along the loci X and X shown by dotted circles.
  • Both pressing and rotating mechanisms 12 and 15 aforementioned are so arranged that upon completion of the former action the latter action is started by means of an interlocking mechanism 19.
  • the interlocking mechanism 19 may be a conventionally known link mechanism.
  • a crank shaft 20 is employed and is so arranged that when a crank part 21 is rotated by a suitable motor not shown in the drawings, both pressing and rotating mechanisms 12 and 15 are interlocked by means of a pin 29.
  • the upper end of a rod 14 of the pressing mechanism 12 and supporting rods 17 and 17' of the rotating mechanism 15 are connected to the identical crank part 21 of the crank shaft.
  • 22 denotes a shaft pin thereof, and 23 a chain engaging each shaft, respectively. As shown in FIG.
  • a receiving member 24 maintains a horizontal rod 25 and acts to prevent articles 1 to be plated from deviating from the predetermined position of a cathodic part where current is supplied.
  • the horizontal rod 25 is freely attachable to and removable from the receiving member 24 and enables articles to be plated to be easily placed in and removed from a cathodic conductor having a wave shape.
  • Articles 1 to be plated are mounted on the parts 7 in the troughs of the wavy shape of the cathode 2 immersed in the plating bath 6 by a proper means.
  • the supplemental anodes 9 are preliminarily so set as to be placed in a predetermined position of the indented part at the ends of articles to be plated.
  • the pressing mechanism 12 of the articles to be plated is so placed as not to press the articles to be plated.
  • crank shaft 20 is rotated to press the articles to be plated by means of rods 14 of the pressing mechanism 12 so as to cause the articles 1 to be plated to come into firm contact with the cathodic part where current is supplied 7 (refer to FIG. 3).
  • the terminals from the power supply required for electroplating are, of course, preliminarily connected to the cathodic conductor and the anode, respectively.
  • a timer is used so that the rotating mechanism 15, which changes the position of the parts to which current is supplied, is activated to repeat the passage of current and rotation after a predetermined period of time.
  • crank shaft 20 is rotated, rods 14 of the pressing mechanism 12 rise in accordance with the rise of a rotating glass rod 16 along the loci X and X' from the lower position during the next half a second. At this time the rotating rod 16 contacts the articles to be plated at the uppermost position to rotate the same.
  • crank shaft 20 makes one rotation and again causes a firm pressure on the articles to be plated, the part to which current is supplied is varied from that at the time of the previous plating.
  • the total plating time was 30 minutes and for the first 5 minutes after the start of plating a DC current of 0.5 a. was supplied, a cycle of electrolysis in a stationary state 16 sees. and rotating time 0.5 sec. was then repeated.
  • a smooth operation is performed by intermittently activating both pressing and rotating mechanisms, to vary and rotate the part to which current is supplied.
  • the aforementioned description is mainly concerned with fused salt aluminium electroplating.
  • the present invention is not limited to the same, but is ap plicable to plating metals other than aluminium in an aqueous solution.
  • An apparatus for electroplating in an electroplating bath comprising:
  • cathode means on which may be supported a plurality of cylindrically-shaped articles to be plated, parts of said cathode means being shaped to receive said cylindrically-shaped articles,
  • control means for synchronizing the operation of said pressing mechanism and said rotaitng mechanism so that the pressing mechanism is inactive while the position of said articles is being changed.
  • An apparatus for electroplating in an electroplating bath comprising:
  • cathode means on which may be mounted a plurality of articles to be plated
  • each trough is partially covered with insulating material, there being an absence of insulating material at a part of a trough contacted by an article received therein.
  • the pressing mechanism includes a plurality of resilient rods, each rod having a part which is shaped and positioned to apply pressure to an article positioned for plating.
  • Apparatus according to claim 1 including means for controlling the supply of current to said cathode means, and means for interengaging the supply current control means and said synchronizing means so that supply or current is stopped upon activation of said rotating mechanism.
  • Apparatus according to claim 2 including a supplemental anode adapted to be located adjacent to the posi- 1 tion of one end of an article to be plated when said article is supported on said cathode means.
  • said cathode means includes a plurality of troughs for receiving said articles to be plated.
  • each trough is partially covered with insulating material, there being an absence Off insulating material at a part of a trough contacted by an article received therein.
  • the pressing mechanism includes a plurality of resilient rods, each rod having a part which is shaped and positioned to apply pressure to an article positioned for plating.

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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)
US00128407A 1970-08-24 1971-03-26 Apparatus for electroplating workpieces including means to vary the position of the workpieces Expired - Lifetime US3746633A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45073631A JPS5014221B1 (cs) 1970-08-24 1970-08-24

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US3746633A true US3746633A (en) 1973-07-17

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US00128407A Expired - Lifetime US3746633A (en) 1970-08-24 1971-03-26 Apparatus for electroplating workpieces including means to vary the position of the workpieces

Country Status (8)

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US (1) US3746633A (cs)
JP (1) JPS5014221B1 (cs)
CA (1) CA933882A (cs)
CH (1) CH534216A (cs)
DE (1) DE2115424C3 (cs)
FR (1) FR2103458B1 (cs)
GB (1) GB1329916A (cs)
SE (1) SE374143B (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6217727B1 (en) * 1999-08-30 2001-04-17 Micron Technology, Inc. Electroplating apparatus and method
EP1191128A3 (en) * 2000-09-20 2004-08-25 Ebara Corporation Plating method and plating apparatus
CN102453944A (zh) * 2010-10-19 2012-05-16 上海嘉捷通电路科技有限公司 一种新型运动式电镀设备
CN103290459A (zh) * 2012-03-05 2013-09-11 无锡宏联电镀设备有限公司 带有震动功能的上下往复式阴极移动装置
CN111893544A (zh) * 2020-07-20 2020-11-06 昆山蕴鼎自动化科技有限公司 电镀装置
CN117265621A (zh) * 2023-11-10 2023-12-22 滨州东利金属科技股份有限公司 一种奥氏体不锈钢表面电镀镍磷的设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1114623B (it) * 1977-07-01 1986-01-27 Oronzio De Nora Impianti Cella elettrolitica monopolare a diaframma

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6217727B1 (en) * 1999-08-30 2001-04-17 Micron Technology, Inc. Electroplating apparatus and method
US6344126B1 (en) 1999-08-30 2002-02-05 Micron Technology, Inc. Electroplating apparatus and method
US6830666B2 (en) 1999-08-30 2004-12-14 Micron Technology, Inc. Electroplating apparatus and method
US20050092610A1 (en) * 1999-08-30 2005-05-05 Moore Scott E. Method of electroplating and varying the resistance of a wafer
EP1191128A3 (en) * 2000-09-20 2004-08-25 Ebara Corporation Plating method and plating apparatus
US20040195106A1 (en) * 2000-09-20 2004-10-07 Koji Mishima Plating method and plating apparatus
CN102453944A (zh) * 2010-10-19 2012-05-16 上海嘉捷通电路科技有限公司 一种新型运动式电镀设备
CN103290459A (zh) * 2012-03-05 2013-09-11 无锡宏联电镀设备有限公司 带有震动功能的上下往复式阴极移动装置
CN103290459B (zh) * 2012-03-05 2015-05-13 无锡宏联电镀设备有限公司 带有震动功能的上下往复式阴极移动装置
CN111893544A (zh) * 2020-07-20 2020-11-06 昆山蕴鼎自动化科技有限公司 电镀装置
CN117265621A (zh) * 2023-11-10 2023-12-22 滨州东利金属科技股份有限公司 一种奥氏体不锈钢表面电镀镍磷的设备
CN117265621B (zh) * 2023-11-10 2024-01-26 滨州东利金属科技股份有限公司 一种奥氏体不锈钢表面电镀镍磷的设备

Also Published As

Publication number Publication date
GB1329916A (en) 1973-09-12
JPS5014221B1 (cs) 1975-05-26
CH534216A (fr) 1973-02-28
FR2103458A1 (cs) 1972-04-14
CA933882A (en) 1973-09-18
FR2103458B1 (cs) 1974-03-22
SE374143B (cs) 1975-02-24
SU439996A3 (ru) 1974-08-15
DE2115424C3 (de) 1975-12-04
DE2115424B2 (de) 1975-04-30
DE2115424A1 (de) 1972-08-10

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