GB817408A - Improvements in and relating to apparatus for the production of hardened surfaces - Google Patents

Improvements in and relating to apparatus for the production of hardened surfaces

Info

Publication number
GB817408A
GB817408A GB3809356A GB3809356A GB817408A GB 817408 A GB817408 A GB 817408A GB 3809356 A GB3809356 A GB 3809356A GB 3809356 A GB3809356 A GB 3809356A GB 817408 A GB817408 A GB 817408A
Authority
GB
United Kingdom
Prior art keywords
workpiece
electrode
spark
production
asymmetric
Prior art date
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
Application number
GB3809356A
Inventor
Gregory Fefer
Dagobert William Alfre Rudorff
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.)
Sparcatron Ltd
Original Assignee
Sparcatron Ltd
Filing date
Publication date
Application filed by Sparcatron Ltd filed Critical Sparcatron Ltd
Publication of GB817408A publication Critical patent/GB817408A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation

Abstract

Apparatus for the production of hardened or tempered surfaces on a metal workpiece by electric spark discharges between the workpiece and an electrode includes one or more asymmetric couples in the spark discharge circuit which allow flow of current only in a direction giving positive polarity to the electrode and negative polarity to the workpiece. During sparking metal from an electrode of appropriate composition is transferred to the workpiece surface. The asymmetric couple may be a one-way selenium rectifier or full-wave rectification as described in Specification 756,727 [Group XXII] may be used. Automatic feed devices maintain the spark gap and the electrode may be vibrated by an electromagnetic vibrator whose frequency and/or amplitude are adjusted automatically in dependence upon the circuit parameters. The spark gap may be shielded by an inert atmosphere or by an atmosphere containing elements which it is desired to introduce into the workpiece surface.
GB3809356A 1956-12-13 Improvements in and relating to apparatus for the production of hardened surfaces Expired GB817408A (en)

Publications (1)

Publication Number Publication Date
GB817408A true GB817408A (en) 1959-07-29

Family

ID=1745154

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3809356A Expired GB817408A (en) 1956-12-13 Improvements in and relating to apparatus for the production of hardened surfaces

Country Status (1)

Country Link
GB (1) GB817408A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0137747A2 (en) * 1983-09-14 1985-04-17 British Steel plc Improvements in or relating to the production of grain oriented steel
EP0332041A2 (en) * 1988-03-05 1989-09-13 British Steel plc Processing grain oriented electrical steel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0137747A2 (en) * 1983-09-14 1985-04-17 British Steel plc Improvements in or relating to the production of grain oriented steel
EP0137747A3 (en) * 1983-09-14 1985-09-25 British Steel Corporation Improvements in or relating to the production of grain oriented steel
EP0332041A2 (en) * 1988-03-05 1989-09-13 British Steel plc Processing grain oriented electrical steel
EP0332041A3 (en) * 1988-03-05 1990-08-22 British Steel plc Processing grain oriented electrical steel

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