GB2022146A - Surface hardening - Google Patents
Surface hardeningInfo
- Publication number
- GB2022146A GB2022146A GB7915768A GB7915768A GB2022146A GB 2022146 A GB2022146 A GB 2022146A GB 7915768 A GB7915768 A GB 7915768A GB 7915768 A GB7915768 A GB 7915768A GB 2022146 A GB2022146 A GB 2022146A
- Authority
- GB
- United Kingdom
- Prior art keywords
- workpiece
- energy beam
- increasing
- heat
- metal
- 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.)
- Granted
Links
- 239000002184 metal Substances 0.000 abstract 3
- 229910052751 metal Inorganic materials 0.000 abstract 3
- 229910001018 Cast iron Inorganic materials 0.000 abstract 2
- 238000002844 melting Methods 0.000 abstract 2
- 230000008018 melting Effects 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010891 electric arc Methods 0.000 abstract 1
- 239000000155 melt Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
In a method for the surface hardening of a metal workpiece wherein heat is supplied to the workpiece by means of a moving energy beam, e.g. an electric arc, which melts the surface at the moving point of contact, the cooling of the workpiece by heat seepage to the interior of the metal surface results in the formation of a hardened surface. However as the movement of the energy beam proceeds, the metal body progressively becomes hotter, so that the depth of the outer hardened zone increases. The invention corrects this feature by decreasing the supply of melting heat to the workpiece whereby a final hardened layer of constant thickness is obtained. The variation in the supply of melting heat may be achieved by increasing the relative motion of the energy beam and the workpiece, e.g. by increasing the movement of the workpiece past the energy beam, and/or increasing the motion of the energy beam, and/or reducing the power of the energy beam. The invention is of particular application to the surface hardening of cast iron e.g. to cast iron camshafts. <IMAGE>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782824373 DE2824373A1 (en) | 1978-06-03 | 1978-06-03 | PROCESS FOR SURFACE HARDENING OF A CAST-IRON WORKPIECE OF LIMITED THERMAL CAPACITY |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2022146A true GB2022146A (en) | 1979-12-12 |
| GB2022146B GB2022146B (en) | 1982-07-07 |
Family
ID=6040914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7915768A Expired GB2022146B (en) | 1978-06-03 | 1979-05-08 | Surface hardening |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS54159324A (en) |
| DE (1) | DE2824373A1 (en) |
| FR (1) | FR2427393A1 (en) |
| GB (1) | GB2022146B (en) |
| IT (1) | IT1188830B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1980002434A1 (en) * | 1979-05-07 | 1980-11-13 | Commw Scient Ind Res Org | Surface hardening of metals by electric arc discharge |
| WO1983000051A1 (en) * | 1981-06-25 | 1983-01-06 | TÖLKE, Peter | Remelting hardening |
| FR2522687A1 (en) * | 1982-03-05 | 1983-09-09 | Aeg Elotherm Gmbh | Surface hardening of camshafts and followers - by controlled speed electric arc |
| GB2131458A (en) * | 1982-12-09 | 1984-06-20 | Zentralinstitut Schweiss | A method for local treatment by melting |
| GB2155498A (en) * | 1984-03-07 | 1985-09-25 | Honda Motor Co Ltd | Method and apparatus for remelting and hardening an elongate workpiece |
| EP0060257B1 (en) * | 1980-09-11 | 1985-10-02 | Sciaky Bros., Inc. | Method for surface hardening cams |
| GB2169318A (en) * | 1985-01-04 | 1986-07-09 | Rolls Royce | Metal surface hardening by carbide formation |
| GB2183255A (en) * | 1985-10-21 | 1987-06-03 | Honda Motor Co Ltd | Local remelting and resolidification |
| EP0732419A1 (en) * | 1995-03-14 | 1996-09-18 | Isuzu Motors Limited | Re-melt processing method on metal surface |
| EP0753598A1 (en) * | 1995-07-10 | 1997-01-15 | Ford Motor Company Limited | Electrochemical hardness modification of non-allotropic metal surfaces |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10261710B4 (en) * | 2002-12-30 | 2011-07-21 | Volkswagen AG, 38440 | Process for surface treatment of a shaft |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB523823A (en) * | 1938-03-18 | 1940-07-23 | Shorter Process Company Ltd | Improvements in or relating to a method of and apparatus for heat-treating metal bodies |
| US2491134A (en) * | 1946-05-21 | 1949-12-13 | Crompton & Knowles Loom Works | Machine for flame tempering cams |
| AT262357B (en) * | 1964-09-23 | 1968-06-10 | Boehler & Co Ag Geb | Process for surface hardening of hardenable steels |
| GB1373490A (en) * | 1970-12-09 | 1974-11-13 | British Steel Corp | Heat treatment of metal strip |
| JPS5313575A (en) * | 1971-07-01 | 1978-02-07 | Ri Keisawa | Fluorescent lamp |
| GB1404865A (en) * | 1971-12-29 | 1975-09-03 | Nissan Motor | Method of forming hardened layers on castings |
| JPS5220930A (en) * | 1975-08-11 | 1977-02-17 | Ube Industries | Method and apparatus for injection of upright die cast machine |
| DE2703469C3 (en) * | 1977-01-28 | 1979-11-22 | Audi Nsu Auto Union Ag, 7107 Neckarsulm | Device for hardening the cam surfaces of camshafts for internal combustion engines |
-
1978
- 1978-06-03 DE DE19782824373 patent/DE2824373A1/en not_active Ceased
-
1979
- 1979-05-08 GB GB7915768A patent/GB2022146B/en not_active Expired
- 1979-05-30 FR FR7913768A patent/FR2427393A1/en not_active Withdrawn
- 1979-05-31 JP JP6693979A patent/JPS54159324A/en active Pending
- 1979-06-01 IT IT49267/79A patent/IT1188830B/en active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1980002434A1 (en) * | 1979-05-07 | 1980-11-13 | Commw Scient Ind Res Org | Surface hardening of metals by electric arc discharge |
| EP0060257B1 (en) * | 1980-09-11 | 1985-10-02 | Sciaky Bros., Inc. | Method for surface hardening cams |
| WO1983000051A1 (en) * | 1981-06-25 | 1983-01-06 | TÖLKE, Peter | Remelting hardening |
| FR2522687A1 (en) * | 1982-03-05 | 1983-09-09 | Aeg Elotherm Gmbh | Surface hardening of camshafts and followers - by controlled speed electric arc |
| GB2131458A (en) * | 1982-12-09 | 1984-06-20 | Zentralinstitut Schweiss | A method for local treatment by melting |
| US4761192A (en) * | 1984-03-07 | 1988-08-02 | Honda Giken Kogyo Kabushiki Kaisha | Method of and apparatus for remelting and hardening a shaft |
| GB2155498A (en) * | 1984-03-07 | 1985-09-25 | Honda Motor Co Ltd | Method and apparatus for remelting and hardening an elongate workpiece |
| GB2169318A (en) * | 1985-01-04 | 1986-07-09 | Rolls Royce | Metal surface hardening by carbide formation |
| US4698237A (en) * | 1985-01-04 | 1987-10-06 | Rolls-Royce Plc | Metal surface hardening by carbide formation |
| GB2183255A (en) * | 1985-10-21 | 1987-06-03 | Honda Motor Co Ltd | Local remelting and resolidification |
| GB2183255B (en) * | 1985-10-21 | 1989-09-20 | Honda Motor Co Ltd | Methods for enhancing the abrasion resistance of alloy components |
| EP0732419A1 (en) * | 1995-03-14 | 1996-09-18 | Isuzu Motors Limited | Re-melt processing method on metal surface |
| EP0753598A1 (en) * | 1995-07-10 | 1997-01-15 | Ford Motor Company Limited | Electrochemical hardness modification of non-allotropic metal surfaces |
Also Published As
| Publication number | Publication date |
|---|---|
| IT7949267A0 (en) | 1979-06-01 |
| GB2022146B (en) | 1982-07-07 |
| IT1188830B (en) | 1988-01-28 |
| FR2427393A1 (en) | 1979-12-28 |
| DE2824373A1 (en) | 1979-12-06 |
| JPS54159324A (en) | 1979-12-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |