WO2010128000A1 - Continuous electrolytic surface finishing of bars. - Google Patents

Continuous electrolytic surface finishing of bars. Download PDF

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Publication number
WO2010128000A1
WO2010128000A1 PCT/EP2010/055918 EP2010055918W WO2010128000A1 WO 2010128000 A1 WO2010128000 A1 WO 2010128000A1 EP 2010055918 W EP2010055918 W EP 2010055918W WO 2010128000 A1 WO2010128000 A1 WO 2010128000A1
Authority
WO
WIPO (PCT)
Prior art keywords
bars
bar
contacts
cell
cathode
Prior art date
Application number
PCT/EP2010/055918
Other languages
French (fr)
Inventor
Nicola Nisco
Ilaria Muratori
Original Assignee
Plating Innovations S.R.L.
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 Plating Innovations S.R.L. filed Critical Plating Innovations S.R.L.
Priority to RU2011149320/02A priority Critical patent/RU2527503C2/en
Priority to PL10715278T priority patent/PL2427593T3/en
Priority to ES10715278.7T priority patent/ES2452168T3/en
Priority to BRPI1007106-7A priority patent/BRPI1007106B1/en
Priority to KR1020117029038A priority patent/KR101657735B1/en
Priority to EP10715278.7A priority patent/EP2427593B1/en
Priority to JP2012508998A priority patent/JP5506916B2/en
Priority to CN201080018990.1A priority patent/CN102317509B/en
Priority to US13/266,309 priority patent/US8821699B2/en
Publication of WO2010128000A1 publication Critical patent/WO2010128000A1/en

Links

Classifications

    • 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
    • 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
    • C25D17/005—Contacting devices

Definitions

  • the present invention relates to a process and apparatus for continuous electrolytic surface finishing of bars.
  • a first continuous chrome-plating system which includes a sequence of bars, connected to one another by means of a threaded pin in order to ensure mechanical and electric continuity thereof, which bars run (without revolving on themselves) on rollers by virtue of a tractor roller through an electrolytic cell where the surface deposit procedure is carried out.
  • the electric contact to the bar is alternatively supplied: by passing the bars through a tank containing mercury, the latter connected to the negative pole of a current rectifier; said mercury contacts are located at the two ends of the electrolytic cell, which has one or more anodes connected to the positive pole therein, the solution closes the circuit;
  • this method is complex, highly dangerous due to mercury toxicity, and does not allow large amounts of current to be transferred, because mercury is not a good conductor and therefore causes high voltage drops; the passage of current causes a considerable heating of the mercury, which should be cooled by appropriate systems; by means of a contact between the bar and a metal conductor in the form of a flexible braid which is wound about the bar on one side and about a revolving drum on the other side, the drum being made of conducting material connected to the negative pole .
  • This apparatus is mechanically very complicated and does not work correctly.
  • the passage of current indeed, causes surface alterations of the bar, with consequent production of a high number of rejects. Furthermore, this method does not allow to transfer high amounts
  • a further method which includes a sequence of bars simply queued after one another without being in reciprocal contact, which transit through an electrolytic cell, in which the machining process is carried out.
  • an apparatus for continuous electrolytic surface finishing of bars comprising at least one cathode, one electrolytic cell containing an electrolyte and comprising an inlet and an outlet for the bars, and at least one longitudinal anode along the route of the bars inside the electrolytic cell, and means for feeding the bars along the axis of the bars for introducing the bars into the cell, characterized in that said at least one cathode consists of a plurality of sliding contacts, each of which is provided with a selectively and independently actuatable energetic source (30) thereof.
  • figure 1 shows a perspective view of an apparatus according to the invention
  • figure 2 is a top plan view of the apparatus
  • figure 3 is a front view of the apparatus
  • figure 4 is a side view of the sliding electric contacts
  • figure 5 shows a section view taken along line V-V in figure 4
  • figure 6 shows a section view taken along line VI-VI in figure 5
  • figure 7 shows a diagrammatic cross-section view of an embodiment with sliding contacts according to the invention
  • figure 8 shows a further configuration of the sliding contacts.
  • an apparatus 1 for continuous electrolytic surface finishing of bars 2 (more generally of metal, non-metal or polymer objects, with full circular section and other, of any length) is shown, comprising two cathodes 3 connectable to the bar 2 to connect it either to the negative or to the positive pole depending on the treatment to be carried out, an electrolytic cell 4 containing an electrolyte 5 and comprising an inlet 6 and an outlet 7 for the bars 2; a longitudinal anode 8 arranged along the route of the bars 2 within the electrolytic cell 4; a plurality of pairs of rollers 9 with inclined rotation axis, motorized or not, are used for rototranslating the bars 2 with a translation along the axis of the bars 2 for introducing the bars 2 into the cell 4 and rotating the bars 2 about their axis.
  • the axes of the rollers 9 belong to a horizontal plane parallel to the feeding direction of bar 2, and are inclined with respect to said feeding direction coinciding with the rotation axis of bar 2. At least one of rollers 9 works as a tractor.
  • the electrolytic treatment about the circumference of the bar is very uniform because the phenomenon of current density non-uniformity on the cathode surface due to the distance between anode and cathode, to the geometries thereof and to the presence of gases developed by the electrochemical process is cancelled.
  • the electrolytic cell 4 further comprises nozzles 10 for introducing a fresh electrolyte 5 in the direction of the axis of bar 2, and in both directions with respect to motion, at cell 4. This promotes a better surface finishing of bar 2, because of the better distribution of fresh electrolyte 5 and because of the effective removal of gases which are developed at the anode and the cathode during the process.
  • Said nozzles 10 are advantageously toroidal and arranged about bar 2.
  • Said contacts 11 are selectively actuatable and electrically adjustable independently from one another, in order to select the current level passing in cell 4.
  • the contacts 11 are of said sliding type and are one or more prism-shaped electric contacts 1 1 made of conductive materials accommodated in containers and moved by actuators which put them in contact with or detach them from the bar. In contact with the bar 2, they transfer the electric charge to bar 2.
  • each single contact 11 is connected to a source of electricity 30 which is sufficient to cover its maximum capacity.
  • the maximum amount of energy delivered by the cell 4 may be increased by increasing the number of contacts 11 connected to their energy sources (figure 7 diagrammatically shows the sliding contacts 11 having five-contact). Adherence of the single contacts to the bar is ensured by using contact-pushing springs 12 which are adapted to the possible geometric imperfections of the bars 2.
  • Contacts 11 are multiple to ensure the passage of high amounts of current, because they also have a capacity limit which may be estimated as ⁇ 720A/contact.
  • each contact 11 is individually supplied because if all contacts were supplied by the same generator, the current would tend to flow onto the contact closest to the tank, thus overloading it and therefore producing surface alterations on the part to be treated with consequent production of rejects, while the remaining contacts would be underused.
  • the present invention allows to individually use each contact at its maximum limit.
  • the maximum current transfer threshold is no longer defined by the contacts but it only depends on the physical features of the object to be electrolyte-treated, which is impossible in the prior art. High or low amounts of amperes may be thus transmitted by varying the number of contacts and accordingly the number of installed current rectifiers.
  • the distribution of contacts 11 about bar 2 may be that shown in figure 8, i.e. radially distributed about the bar 2 because they are supported by a ring 50 through which the bar 2 passes sliding on the contacts 11.

Landscapes

  • 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)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

An apparatus (1) for continuous electrolytic surface finishing of bars (2) is described, comprising at least one cathode (3), one electrolytic cell (4) containing an electrolyte (5) and comprising an inlet (6) and an outlet (7) for the bars (2), and at least one longitudinal anode (8) along the route of the bars (2) inside the electrolytic cell (4), and means (9) for feeding the bars (2) along the axis of the bars (2) for introducing the bars (2) into the cell (4). Said at least one cathode (3) consists of a plurality of sliding contacts (11), each of which is provided with a selectively and independently actuatable energetic source (30) thereof.

Description

"Continuous electrolytic surface finishing of bars" * * * *
DESCRIPTION
The present invention relates to a process and apparatus for continuous electrolytic surface finishing of bars.
A first continuous chrome-plating system is known, which includes a sequence of bars, connected to one another by means of a threaded pin in order to ensure mechanical and electric continuity thereof, which bars run (without revolving on themselves) on rollers by virtue of a tractor roller through an electrolytic cell where the surface deposit procedure is carried out. The electric contact to the bar is alternatively supplied: by passing the bars through a tank containing mercury, the latter connected to the negative pole of a current rectifier; said mercury contacts are located at the two ends of the electrolytic cell, which has one or more anodes connected to the positive pole therein, the solution closes the circuit; this method is complex, highly dangerous due to mercury toxicity, and does not allow large amounts of current to be transferred, because mercury is not a good conductor and therefore causes high voltage drops; the passage of current causes a considerable heating of the mercury, which should be cooled by appropriate systems; by means of a contact between the bar and a metal conductor in the form of a flexible braid which is wound about the bar on one side and about a revolving drum on the other side, the drum being made of conducting material connected to the negative pole . This apparatus is mechanically very complicated and does not work correctly. The passage of current, indeed, causes surface alterations of the bar, with consequent production of a high number of rejects. Furthermore, this method does not allow to transfer high amounts of current.
A further method is known, which includes a sequence of bars simply queued after one another without being in reciprocal contact, which transit through an electrolytic cell, in which the machining process is carried out.
These bars are fed on rollers while being rotated on their longitudinal axis by means of complex mechanical apparatuses which we may describe as revolving clamps. Said clamps have parts which come in contact with the bars made of conductive material (copper) and, in addition to mechanical contact needed for drawing, also ensure the electric contact needed for the electrolytic process. This system is very efficient and high amounts of current are transferred. However, it is mechanically very complex and requires costly maintenance operations because the contacts are to be frequently cleaned and the flexible conductors which carry the current to the clamps are to be very frequently replaced. Another disadvantage is that said clamps are translated forward by means of an actuator, which pushes them on slides. The direct consequence of this limited stroke is the need to interrupt the delivery of current and the electrolytic treatment every time the clamps reach the stoke end to allow the clamps to go back to the initial position and resume the operation. Another limiting feature is the low number of revolutions per linear meter of feeding (about half a revolution per meter). Because the amount and uniformity of the surface deposit depends on the number of revolutions which occur in the cell, this system is better than the previous one but also has many limits. It is the object of the present invention to provide an apparatus for the continuous electrolytic surface finishing of bars which ensures very high finishing quality, use flexibility and constructional simplicity.
In accordance with the invention, this object is achieved by an apparatus for continuous electrolytic surface finishing of bars comprising at least one cathode, one electrolytic cell containing an electrolyte and comprising an inlet and an outlet for the bars, and at least one longitudinal anode along the route of the bars inside the electrolytic cell, and means for feeding the bars along the axis of the bars for introducing the bars into the cell, characterized in that said at least one cathode consists of a plurality of sliding contacts, each of which is provided with a selectively and independently actuatable energetic source (30) thereof.
These and other features of the present invention will be further explained in the following detailed description of a practical embodiment thereof, shown by the way of non- limitative example in the accompanying drawings, in which: figure 1 shows a perspective view of an apparatus according to the invention; figure 2 is a top plan view of the apparatus; figure 3 is a front view of the apparatus; figure 4 is a side view of the sliding electric contacts; figure 5 shows a section view taken along line V-V in figure 4; figure 6 shows a section view taken along line VI-VI in figure 5; figure 7 shows a diagrammatic cross-section view of an embodiment with sliding contacts according to the invention, figure 8 shows a further configuration of the sliding contacts.
With reference to the accompanying drawings, and in particular to figures 1 and 2, an apparatus 1 for continuous electrolytic surface finishing of bars 2 (more generally of metal, non-metal or polymer objects, with full circular section and other, of any length) is shown, comprising two cathodes 3 connectable to the bar 2 to connect it either to the negative or to the positive pole depending on the treatment to be carried out, an electrolytic cell 4 containing an electrolyte 5 and comprising an inlet 6 and an outlet 7 for the bars 2; a longitudinal anode 8 arranged along the route of the bars 2 within the electrolytic cell 4; a plurality of pairs of rollers 9 with inclined rotation axis, motorized or not, are used for rototranslating the bars 2 with a translation along the axis of the bars 2 for introducing the bars 2 into the cell 4 and rotating the bars 2 about their axis.
The inclination of the rollers 9 is easily understandable by observing figures 2 and 3: the axes of the rollers 9 belong to a horizontal plane parallel to the feeding direction of bar 2, and are inclined with respect to said feeding direction coinciding with the rotation axis of bar 2. At least one of rollers 9 works as a tractor. Within the electrolytic cell, the number of revolutions per meter is extremely high. As a result, the electrolytic treatment about the circumference of the bar is very uniform because the phenomenon of current density non-uniformity on the cathode surface due to the distance between anode and cathode, to the geometries thereof and to the presence of gases developed by the electrochemical process is cancelled. Furthermore, this system allows to use an anode 8 with an extremely simplified shape as compared to known solutions. The electrolytic cell 4 further comprises nozzles 10 for introducing a fresh electrolyte 5 in the direction of the axis of bar 2, and in both directions with respect to motion, at cell 4. This promotes a better surface finishing of bar 2, because of the better distribution of fresh electrolyte 5 and because of the effective removal of gases which are developed at the anode and the cathode during the process.
Said nozzles 10 are advantageously toroidal and arranged about bar 2. The cathodes 3, one upstream and the other downstream of the cell 4, each comprise a plurality of sliding contacts 11 on the bar 2 (figures 4-6) independently supplied from one another, i.e. each contact has an independent energy source 30 (figure 7).
Said contacts 11 are selectively actuatable and electrically adjustable independently from one another, in order to select the current level passing in cell 4.
In particular, the contacts 11 are of said sliding type and are one or more prism-shaped electric contacts 1 1 made of conductive materials accommodated in containers and moved by actuators which put them in contact with or detach them from the bar. In contact with the bar 2, they transfer the electric charge to bar 2. In order to fully exploit potentialities, each single contact 11 is connected to a source of electricity 30 which is sufficient to cover its maximum capacity. The maximum amount of energy delivered by the cell 4 may be increased by increasing the number of contacts 11 connected to their energy sources (figure 7 diagrammatically shows the sliding contacts 11 having five-contact). Adherence of the single contacts to the bar is ensured by using contact-pushing springs 12 which are adapted to the possible geometric imperfections of the bars 2.
Contacts 11 are multiple to ensure the passage of high amounts of current, because they also have a capacity limit which may be estimated as ~720A/contact.
Furthermore, each contact 11 is individually supplied because if all contacts were supplied by the same generator, the current would tend to flow onto the contact closest to the tank, thus overloading it and therefore producing surface alterations on the part to be treated with consequent production of rejects, while the remaining contacts would be underused. On the other hand, the present invention allows to individually use each contact at its maximum limit.
The maximum current transfer threshold is no longer defined by the contacts but it only depends on the physical features of the object to be electrolyte-treated, which is impossible in the prior art. High or low amounts of amperes may be thus transmitted by varying the number of contacts and accordingly the number of installed current rectifiers.
Further advantages of the present invention include: current delivery is interrupted only once while machining the bar unlike the known methods; the moving parts are very small and movements are very limited and therefore enormous advantages are obtained in terms of cost for maintenance and replacing worn parts (sliding contacts only); the amount of deposit is considerably higher if the radial thickness is uniform; - by virtue of the use of said toroidal nozzles 10 within the electrolytic tank, the hydrogen generated when machining is effectively removed from the bar surface, with consequent improvement of the structural deposit qualities, which deposit is free from nodules also at high current densities during the surface treatment; the electrolyte between the surface to be coated and the anode is always constant at the correct density and at the correct temperature during every deposition steps.
Advantageously, the distribution of contacts 11 about bar 2 may be that shown in figure 8, i.e. radially distributed about the bar 2 because they are supported by a ring 50 through which the bar 2 passes sliding on the contacts 11.
Multiple layers even of different materials may be advantageously deposited, in subsequent layers. Indeed the electrolytic process may be repeated several times by simply added several machining steps on the same rototranslating line.

Claims

1. Apparatus (1) for continuous electrolytic surface finishing of bars (2) comprising at least one cathode (3), one electrolytic cell (4) containing an electrolyte (5) and comprising an inlet (6) and an outlet (7) for the bars (2), and at least one longitudinal anode (8) along the route of the bars (2) inside the electrolytic cell (4), and means (9) for feeding the bars (2) along the axis of the bars (2) for introducing bars (2) into the cell (4), characterized in that said at least one cathode (3) consists of a plurality of sliding contacts (11), each of which is provided with a selectively and independently actuatable energetic source (30) thereof.
2. Apparatus (1) according to claim 1, characterized in that said at least one cathode (3) is provided with a plurality of sliding contacts (11) radially distributed about the bar (2) because they are supported by a ring (50) through which the bar (2) passes sliding on the contacts (11).
3. Apparatus (1) according to claim 1 or 2, characterized in that it comprises rollers (9) with inclined axis with respect to the axis of the bars (2) for rototranslating the bars (2).
4. Apparatus (1) according to claims 1-3, characterized in that said electrolytic cell (4) further comprises nozzles (10) for introducing a fresh electrolyte (5) in the direction of the axis of the bar (2) at the cell (4).
5. Process for the continuous electrolytic surface finishing of bars (2) comprising the independent activation of energy sources (30) for respective sliding cathodic contacts (1 1) radially distributed about a bar (2) to be surface finished in an apparatus according to claims 1-4.
PCT/EP2010/055918 2009-05-05 2010-04-30 Continuous electrolytic surface finishing of bars. WO2010128000A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
RU2011149320/02A RU2527503C2 (en) 2009-05-05 2010-04-30 Continuous electrolytic surface processing of rods
PL10715278T PL2427593T3 (en) 2009-05-05 2010-04-30 Continuous electrolytic surface finishing of bars.
ES10715278.7T ES2452168T3 (en) 2009-05-05 2010-04-30 Continuous electrolytic surface finish of bars
BRPI1007106-7A BRPI1007106B1 (en) 2009-05-05 2010-04-30 apparatus and process for finishing bars with a continuous electrolytic surface
KR1020117029038A KR101657735B1 (en) 2009-05-05 2010-04-30 Continuous electrolytic surface finishing of bars
EP10715278.7A EP2427593B1 (en) 2009-05-05 2010-04-30 Continuous electrolytic surface finishing of bars.
JP2012508998A JP5506916B2 (en) 2009-05-05 2010-04-30 Apparatus and method for continuous electrolytic surface finishing of bars
CN201080018990.1A CN102317509B (en) 2009-05-05 2010-04-30 Continuous electrolytic surface finishing of bars
US13/266,309 US8821699B2 (en) 2009-05-05 2010-04-30 Continuous electrolytic surface finishing of bars

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2009A000760 2009-05-05
ITMI2009A000760A IT1393960B1 (en) 2009-05-05 2009-05-05 ELECTROLYTIC SURFACE FINISH OF BARS IN CONTINUOUS.

Publications (1)

Publication Number Publication Date
WO2010128000A1 true WO2010128000A1 (en) 2010-11-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/055918 WO2010128000A1 (en) 2009-05-05 2010-04-30 Continuous electrolytic surface finishing of bars.

Country Status (11)

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US (1) US8821699B2 (en)
EP (1) EP2427593B1 (en)
JP (1) JP5506916B2 (en)
KR (1) KR101657735B1 (en)
CN (1) CN102317509B (en)
BR (1) BRPI1007106B1 (en)
ES (1) ES2452168T3 (en)
IT (1) IT1393960B1 (en)
PL (1) PL2427593T3 (en)
RU (1) RU2527503C2 (en)
WO (1) WO2010128000A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6189656B2 (en) * 2013-06-14 2017-08-30 Ｋｙｂ株式会社 Power supply member and high-speed plating apparatus including the same
CN104195611B (en) * 2014-08-15 2016-09-14 洛阳弘洋机械有限公司 A kind of bar continuous chromium plating production line
CN105369313A (en) * 2014-08-26 2016-03-02 洛阳弘洋机械有限公司 Powering-up device for continuous chromium plating production line
CN108642552A (en) * 2018-07-02 2018-10-12 浙江贝耐特工具有限公司 A kind of clamping device for round plated item

Citations (3)

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JPH0261093A (en) * 1988-08-26 1990-03-01 C Uyemura & Co Ltd Electroplating equipment for long-sized work
US5865979A (en) * 1992-01-27 1999-02-02 Thomas & Betts Corporation Ground rod and apparatus and method for electroplating
US20070278093A1 (en) * 2006-06-02 2007-12-06 Barnard Michael P Electrical conductive contact ring for electroplating or electrodeposition

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JPS4938412B1 (en) * 1969-03-24 1974-10-17
SU507671A1 (en) * 1973-12-13 1976-03-25 Московский гидромелиоративный институт Electroplating Device by Electrocontact Method
FR2335628A1 (en) * 1975-12-16 1977-07-15 Commissariat Energie Atomique ELECTROLYTIC DEVICE FOR MARKING METAL PARTS
JPS59172769U (en) * 1983-05-06 1984-11-19 住友金属工業株式会社 Conductor roll power supply device
JPH04333596A (en) * 1991-05-09 1992-11-20 Casio Comput Co Ltd Plating method
RU2225464C2 (en) * 2002-01-08 2004-03-10 Устюгов Алексей Георгиевич Automatic galvanic plant for treatment of cylindrical rods
CN100595344C (en) * 2008-03-19 2010-03-24 苏州市荣丰化工环保设备有限公司 Continuous electroplating device

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH0261093A (en) * 1988-08-26 1990-03-01 C Uyemura & Co Ltd Electroplating equipment for long-sized work
US5865979A (en) * 1992-01-27 1999-02-02 Thomas & Betts Corporation Ground rod and apparatus and method for electroplating
US20070278093A1 (en) * 2006-06-02 2007-12-06 Barnard Michael P Electrical conductive contact ring for electroplating or electrodeposition

Also Published As

Publication number Publication date
US8821699B2 (en) 2014-09-02
ES2452168T3 (en) 2014-03-31
KR101657735B1 (en) 2016-09-19
CN102317509A (en) 2012-01-11
JP2012526194A (en) 2012-10-25
CN102317509B (en) 2014-03-12
US20120111729A1 (en) 2012-05-10
IT1393960B1 (en) 2012-05-17
PL2427593T3 (en) 2014-05-30
JP5506916B2 (en) 2014-05-28
BRPI1007106A2 (en) 2020-10-06
BRPI1007106B1 (en) 2021-03-16
KR20120024707A (en) 2012-03-14
ITMI20090760A1 (en) 2010-11-06
EP2427593B1 (en) 2014-01-01
RU2011149320A (en) 2013-06-10
EP2427593A1 (en) 2012-03-14
RU2527503C2 (en) 2014-09-10

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