US3748239A - Method of electrolytically marking a metallic article - Google Patents

Method of electrolytically marking a metallic article Download PDF

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Publication number
US3748239A
US3748239A US00173158A US3748239DA US3748239A US 3748239 A US3748239 A US 3748239A US 00173158 A US00173158 A US 00173158A US 3748239D A US3748239D A US 3748239DA US 3748239 A US3748239 A US 3748239A
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US
United States
Prior art keywords
marking
voltage
article
electrolytically
time
Prior art date
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Expired - Lifetime
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US00173158A
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English (en)
Inventor
P Lavalette
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF Compagnie dApplications Mecaniques SA
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SKF Compagnie dApplications Mecaniques SA
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
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Application filed by SKF Compagnie dApplications Mecaniques SA filed Critical SKF Compagnie dApplications Mecaniques SA
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Publication of US3748239A publication Critical patent/US3748239A/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching
    • C25F3/14—Etching locally
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S204/00—Chemistry: electrical and wave energy
    • Y10S204/08—AC plus DC

Definitions

  • This invention relates to the marking of metallic articles, and in particular to the marking of precision components such as bearing races.
  • the object of the invention is to improve the process of the electrolytic marking in order to permit rapid marking, but nevertheless obtain a sufiicient depth of mark.
  • the invention consists, in applying successively, between the electrodes of an electrolytic marking apparatus of a known type, a pulse of alternating current alternating at a frequency of several tenths of a second, at a suitable low voltage of the order of 24 volts, followed by a pulse of direct current lasting several seconds at a voltage depending on the depth of the cut, with the member to be marked constituting the anode.
  • the tool used is an electrolytic head of a conventional type closed by a stencil which is to be applied to the surface of the article to be marked, which constitutes one of the electrodes.
  • the other electrode for example made of stainless steel, is within the head.
  • the electrolyte used in the head is a solution consisting of a mixture of sodium nitrite and a conventional complexing agent. This solution may be more or less diluted in water.
  • the two electrodes are connected to a source of continuous low voltage current (20 to 30 volts for example) with the article to be marked being in the position of the anode, the portions of the article opposite the permeable parts of the stencil are hollowed out.
  • the voltage between the electrodes must become equal to a small counter-electrometive force plus a voltage drop proportional to the voltage multiplied by the internal resistance.
  • the counter-electromotive force is practically negligible as compared with the voltage drop so that the intensity must be proportional to the voltage drop that is to say constant, if a constant voltage is applied. Since, on the other hand, the depth of the mark is proportional to the quantity of electricity which has passed through the electrolytic head, it must be proportional to time if the voltage is constant.
  • the electrolytic head is supplied by means of an alternating voltage having a substantially equivalent effective value, it will be seen that the marking takes place on the contrary quite rapidly, but then it does not increase.
  • the depth of cut is about two microns, regardless of the time of marking.
  • the increase in time of marking produces a blurring of the edges of the mark, so that the mark becomes rapidly less clear about its edges.
  • the attached drawing show the circuit diagram of an installation adapted to carry out the invention.
  • This shows the electrolytic head 1 of a conventional type applied to the article 2, and containing the electrode 3, which is made of stainless steel.
  • the parts 2 and 3 are connected by conductive wires and a bipolar inverting switch 4 to the two terminals 5 and 6 respectively of a source of low voltage alternating current, for example 22 volts, when it is swung to the right of the figure, and to the two terminals 7 and 8 of a source of direct current of variable voltage when it is swung to the left side of the figure, the positive terminal being connected to the member 2 as indicated above.
  • the source of direct adjustable voltage current may consist of a rectitying bridge 9 supplied from the terminals 5 and 6 by a transformer 10 at a variable transforming ratio.
  • the control of the bipolar switch 4 may be actuated directly by the automatic means for feeding articles to the marking device.
  • the product may also be applied to the marking of any article of ferrous metal, but it is particularly useful as, as has been seen, in connection with articles manufactured on a large scale which must be marked in a very short time.
  • the method of electrolytically marking a metallic article by means of an electrolytic marking head pro vided with an electrode comprises the steps of applying alternating current between said electrode and article for from 0.2 to 0.5 second and immediately thereafter applying a direct current between said electrode connected as a cathode and said article connected as an anode for a substantially longer period of time.

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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)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Duplication Or Marking (AREA)
US00173158A 1970-09-08 1971-08-19 Method of electrolytically marking a metallic article Expired - Lifetime US3748239A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7032618A FR2104939B1 (it) 1970-09-08 1970-09-08

Publications (1)

Publication Number Publication Date
US3748239A true US3748239A (en) 1973-07-24

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ID=9061043

Family Applications (1)

Application Number Title Priority Date Filing Date
US00173158A Expired - Lifetime US3748239A (en) 1970-09-08 1971-08-19 Method of electrolytically marking a metallic article

Country Status (7)

Country Link
US (1) US3748239A (it)
JP (1) JPS509734B1 (it)
DE (1) DE2144735C3 (it)
FR (1) FR2104939B1 (it)
GB (1) GB1329192A (it)
IT (1) IT960523B (it)
SE (1) SE366774B (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067790A (en) * 1975-12-11 1978-01-10 Skf Compagnie D'applications Mecaniques Method of electrolytically marking metallic articles
US4073710A (en) * 1975-08-11 1978-02-14 Ultra Centrifuge Nederland N.V. Method of machining electrically conducting substances by electrochemical attack
US4110190A (en) * 1975-08-11 1978-08-29 Ultra Centrifuge Nederland N.V. Apparatus for machining electrically conducting substances by electrochemical attack
US4206028A (en) * 1976-12-14 1980-06-03 Inoue-Japax Research Incorporated Electrochemical polishing system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4073710A (en) * 1975-08-11 1978-02-14 Ultra Centrifuge Nederland N.V. Method of machining electrically conducting substances by electrochemical attack
US4110190A (en) * 1975-08-11 1978-08-29 Ultra Centrifuge Nederland N.V. Apparatus for machining electrically conducting substances by electrochemical attack
US4067790A (en) * 1975-12-11 1978-01-10 Skf Compagnie D'applications Mecaniques Method of electrolytically marking metallic articles
US4206028A (en) * 1976-12-14 1980-06-03 Inoue-Japax Research Incorporated Electrochemical polishing system

Also Published As

Publication number Publication date
GB1329192A (en) 1973-09-05
IT960523B (it) 1973-11-30
FR2104939B1 (it) 1973-11-23
DE2144735A1 (de) 1972-03-16
DE2144735B2 (de) 1974-01-24
JPS509734B1 (it) 1975-04-15
SE366774B (it) 1974-05-06
FR2104939A1 (it) 1972-04-28
DE2144735C3 (de) 1974-08-22

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