GB2315497A - Plasma-carburizing and quenching a metal workpiece involving transfer of workpiece - Google Patents
Plasma-carburizing and quenching a metal workpiece involving transfer of workpiece Download PDFInfo
- Publication number
- GB2315497A GB2315497A GB9714827A GB9714827A GB2315497A GB 2315497 A GB2315497 A GB 2315497A GB 9714827 A GB9714827 A GB 9714827A GB 9714827 A GB9714827 A GB 9714827A GB 2315497 A GB2315497 A GB 2315497A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carburizing
- workpiece
- metal
- plasma
- chamber
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
Abstract
Disclosed is an apparatus and a method for plasma-carburizing a workpiece of metal, which have a low manufacturing cost, is convenient to operate and repair, and is capable of enhancing the productivity of the workpiece of metal which is carburized and the quality of a heat treatment. An apparatus 30 for plasma-carburizing includes a carburizing chamber 30 for carburizing a workpiece of metal by generating a plasma. The carburizing chamber 30 includes a loading deck 39 for loading the workpiece and a lid 38 for opening and closing the carburizing chamber 30. The loading deck 39 is integrally formed with the lid 38. A cooling chamber 33 for quenching the workpiece, which is carburized by using the plasma, is installed at a predetermined position adjacent to the carburizing chamber 30. A transfer member of the apparatus for plasma-carburizing transfers the workpiece of metal from the carburizing chamber 30 to the cooling chamber 33 under the state that the workpiece is released from the carburizing chamber 30 at the normal temperature.
Description
2315497 APPARATUS AND METHOD FOR PLASMA-CARBURIZING A
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus and a method for plasmacarburizing a workpiece of metal, and more particularly to an apparatus and a method for plasmacarburizing a workpiece of metal, which employs an improved quenching technology during the performance of the plasmacarburizing being used as a heating treatment technology for hardening a surface of a metal.
2. Description of the Prior Art
U.S. Pat. No. 5,383,980 issued to Albrecht Melber et al. on January 24, 1995, discloses a process for hardening workpieces in a pulsed plasma discharge. Generally, such as a carburizing, in a heating treatment technology for hardening the surface of the workpiece of metal by diffusing a plasma of high temperature, it is necessary to employ a quenching technology. The quenching technology is mainly used for hardening the surface of the workpiece of metal at the time that the heating treatment technology is performed at a predetermined temperature above the AC3 temperature. Accordingly, a variety of quenching technologies, which are convenient to perform thereof and to control process 1 parameters, have been proposed hitherto.
U. S. Pat. No. 4,462,577 issued to Herbert W. Westeren on July 31, 1984, discloses an apparatus for gas cooling work parts under high pressure in a continuous heat treating carburizing furnace. In the Herbert W. Westeren's apparatus, the carburizing furnace includes a heat chamber and a cooling chamber.
FIG. 1 is a schematic view of a conventional plasma-carhurizing apparatus, showing a general constitution of the plasma-carburizing apparatus.
Referring to FIG. 1, a plasma-carburizing apparatus 10 includes a heat chamber 11 and a cooling chamber 12. A manifold 14 extending from a gas supply system 13 is connected with the heat chamber 11. In addition, an auxiliary heater 15 and a carburizing system 16 are installed in the heat chamber 11. Meanwhile, a carburizing system 16a, a gas cooling fan 17, an oil heater 18 and an oil circulator 19 are installed in the cooling chamber 12.
The plasma-carburizing apparatus 10 as shown in FIG. 1 is widely used for plasma-carhurizing a workpiece of metal in all parts of the world. However, in the plasma-carburizing apparatus as described above, an internal constitution of thereof is complicated because the cooling chamber 12 must be maintained under carburizing therein during the heat treatment of the workpiece of metal. This means that the heat chamber must be maintained under carburizing therein. In addition, a cooling oil adapted to a carburizing state must be used. The manufacturing cost of the cooling oil is high. Accordingly, the plasma-carburizing apparatus is manufactured at a high cost.
2 Meanwhile, there are a large number of unnecessary devices in the plasmacarburizing apparatus as described above. Accordingly, the manufacturing cost of the plasma-carburizing apparatus is also increased due to the unnecessary devices. Further, it is difficult to maintain and repair the plasma-carburizing apparatus due to the interference between the devices, noises and electromagnetic waves. Therefore, a general worker not a skilled specialist does not easily perform works related to the maintain and the repair for the plasma-carburizing apparatus.
In addition, a maintaining cost of the plasma-carburizing apparatus is high. There is a limit to a place for installing the plasma-carburizing apparatus. Further, the heat chamber, which is a carburizing chamber, can be contaminated during the cooling of the workpiece of metal. In relation to use the plasma-carburizing apparatus, the coefficient of utilization of the public equipments is high. Finally, a spending time for transferring the workpiece of metal from the heat chamber to the cooling chamber is very long. Accordingly, the quality of the heat treatment is deteriorated.
3 SUNMARY OF THE INVENTION The present invention is contrived to solve the foregoing problems. It is an object of the present invention to provide an apparatus and a method for plasma-carburizing a workpiece of metal, which has a low manufacturing cost.
It is other object of the present invention to provide an apparatus and a method for plasma-carburizing a workpiece of metal, which is convenient to operate and repair.
It is another object of the present invention to provide an apparatus and a method for plasma-carburizing a workpiece of metal, capable of enhancing the productivity of the workpiece of metal which is carburized and the quality of a heat treatment.
In order to achieve the above objects, according to a first aspect of the present invention, the present invention provides an apparatus for plasmacarburizing a workpiece of metal comprising:
a carburizing chamber for carburizing the workpiece of metal by generating a plasma; a cooling chamber for quenching the workpiece of metal which is carburized by using the plasma; and a transfer member for transferring the workpiece of metal from the carburizing chamber to the cooling chamber under the state that the workpiece of metal is released from the carburizing chamber at the normal temperature.
The carburizing chamber includes a loading deck for loading the workpiece of metal and a lid for opening and closing the carburizing chamber. The loading deck is 4 integrally formed with the lid.
In order to achieve the above objects, according to a second aspect of the present invention, the present invention provides a method for plasmacarburizing a workpiece of metal, comprising the steps of.
carburizing (S1) the workpiece of metal by generating a plasm, within a carburizing chamber; releasing (S2) the workpiece of metal in steps (S 1) from the carburizing chamber at the normal temperature; and quenching (S3) the workpiece of metal in steps (S2) in a cooling. chamber.
BRIEF DESCRIPTION OF THE DRAWINGS
The above object and other characteristics and advantages of the present invention will become more apparent by describing in detail a preferred embodiment thereof with reference to the attached drawings, in which:
FIG. 1 is a schematic view of a conventional plasma-carburizing apparatus, showing a general constitution of the plasma-carburizing apparatus; FIG. 2 is a schematic view of a plasma -carburizing apparatus according to a preferred embodiment of the present invention, showing a constitution of the plasmacarburizing apparatus; and FIG. 3 is a graph showing the change of the temperature with respect to the transferring time of a workpiece of metal in the preferred embodiment of the present invention.
6 DETAIIXI) DESCRIMON OF THE INVENTION Hereinafter, a preferred emnent of the present invention will be explained in more detail with reference to the accompanying drawings.
FIG. 2 is a schematic view of a plasma-carburizing apparatus according to a preferred embodiment of the present invention, showing a constitution of the plasmacarburizing apparatus.
As shown in FIG. 2, a plasma-carburizing apparatus 30 according to the preferred embodiment of the present invention includes a carburizing chamber 30 for plasmacarburizing a workpiece of metal. A plurality of pipes (not shown) for supplying carburizing gas and inert gas with the carburizing chamber 30 is connected with the carburizing chamber 30. The inert gas increases an internal pressure of the carburizing chamber 30 at the time that the inert gas is introduced into the carburizing chamber 30.
A cooling chamber 33 is installed at a position adjacent to the carburizing chamber 32. A forked feed bar 34 is installed above the carburizing chamber 30 and the cooling chamber 33, and is supported by a support bar 35. The forked feed bar 34 is spaced from the carburizing chamber 30 and the cooling chamber 33 at a predetermined height.
An overhead crane 36 is installed to a lower surface of the forked feed bar 34. The overhead crane 36 can slide along the lower surface of the forked feed bar 34 in the horizontal direction. A shaft 37 is installed to the lower surface of the forked feed bar 34.
The shaft 37 can move upward and downward. The distal end of the shaft 37 is connected with an upper surface of a lid 38. The lid 38 covers an upper portion of the carburizing 7 chamber 32 at the time that the workpiece of metal is carburized within the carburizing chamber 32. In addition, the lid 38 covers an upper portion of the cooling chamber 33 at the time that the workpiece of metal is cooled within the cooling chamber 33.
A loading deck 39 for loading the workpiece of metal 31 is integrally formed with a lower portion of the lid 38 by a connecting rod 40. Accordingly, the lid 38 and the loading deck 39 move together upward and downward according to the operation of the shaft 37.
Hereinbelow, the process for operating the apparatus for plasmacarburizing a workpiece of metal will be briefly described with reference to the accompanying drawings.
First, when an operator wants to carburize a workpiece of metal 31, the operator loads the workpiece of metal 31 on the loading deck 39. Then, the operator moves the loading deck 39 to the upper portion of the carburizing chamber 32 by using the overhead crane 36. After that, the operator moves the shaft 37, in which the lid 38 and the loading deck 39 are integrally connected with each other, until the lid 38 covers the upper portion of the carburizing chamber 32. Then, the loading deck 39, on which the workpiece 31 is loaded, is positioned in the interior of the carburizing chamber 32.
Under this state, the operator maintains the carburizing chamber 32 in a carburizing state. Then, the operator carburizes the workpiece of metal 31 by using a plasma at a proper temperature and for a proper time in accordance with process parameters adapted for a chemical component of the workpiece of metal 31. After that, the operator injects an argon gas into the carburizing chamber 32 under the carburizing 8 chamber 32 is maintained at a high temperature, whereby an internal pressure of the carburizing chamber 32 rises up to atmospheric pressure.
Thereafter, if the operator moves upward the shaft 37, the lid 38, which is connected with the shaft 37, and the workpiece of metal 3 1, which is loaded on the loading deck 39 and is carburized, are released from the carburizing chamber 32. Then, the operator moves the loading deck 39 on which the metal piece 31 is loaded toward the upper portion of the cooling chamber 33 by moving the overhead crane 36 along the forked feed bar 34. Thereafter, the operator moves downward the shaft 37 of the over head crane 36, thereby the loading deck 39 is introduced into the cooling chamber 33. As a result, the workpiece of metal 31, which is loaded on the loading deck 39, can be direct quenched.
At this time, it is important that an exposure time of the workpiece of metal 31 to the atmosphere. This is an important factor for obtaining a heat treatment of good quality. If the temperature of the surface of the workpiece of metal 31 does not descend below the AC3 temperature, the quality of the heat treatment is not deteriorated during the quenching of the workpiece of metal 3 1. In addition, the total formation of the workpiece of metal 31 according to the heat treatment decreases. This is confirmed with reference to FIG. 3.
FIG. 3 is a graph showing the change of the temperature with respect to the transferring time of a workpiece of metal in the preferred embodiment of the present invention.
9 As shown in FIG. 3, if the total erring time of the workpiece of metal 31 is within about two minutes, preferably within about one and a half minutes, the temperature of the surface of the workpiece of metal 31 does not descend below the AC3 temperature. In addition, an formation of an oxidation film on the surface of the workpiece of metal 31 due to the exposure to the atmosphere is not serious differently than the workpiece of metal 31 is carburized by using gas.
The apparatus for plasma-carburizing as described above employs the transfer device and the loading deck simpler than those of the conventional apparatus for plasmacarburizing including the heat chamber and the cooling chamber. In addition, the process as described above provides the heating treatment technology using the plasma superior than the conventional heat treatment technology. The heating treatment technology can be used for hardening the surfaces of a variety of machinery components.
Ilds process can be controlled by operating a simple switch. That is, if the operator pushes a start button under the state that a variety of process parameters such as a treatment temperature, a treatment time and a cooling condition are inputted, the total process proceeds in sequence. Then, the workpiece of metal which is heat-treated for hardening the surface thereof can be obtained. Consequently, it is possible to reduce the ratio of the labor cost included in the process cost. In addition, it is possible to obtain a system which can be simply maintained and repaired because the apparatus for plasmacarburizing includes the simple cooling system.
As described above, the apparatus for plasma-carburizing according to the present invention employs the improved quenching technology during the performance of the 10 plasma-carburizing. Accordingly, it is possible to reduce the manufacturing cost of the apparatus for plasma-carburizing. In addition, it is convenient to perform the process in relation to the operation of the apparatus for plasma-carburizing. Further, it is possible to simply maintain and repair the apparatus for plasma-carburizing.
In addition, it is possible to supply an apparatus for plasma-carburizing having a good quality at a relative low cost. Further, the productivity of the workpiece of metal, which is plasma-carburized, and the quality of the heat treatment are highly enhanced. More particularly, the apparatus for plasma-carburizing according to the present invention can reduce the process cost by reducing the process time at the time that a plurality of machinery components used for transmitting a driving force are heattreated. In addition, it is possible to provide the apparatus for plasmacarburizing having a light weight by maxiniizing the wear resistance and the fatigue resistance.
While the present invention has been particularly shown and described with reference to a particular embodiment thereof, it will be understood by those skilled in the art that van ' ous changes in form and detail may be effected therein without departing from the spirit and scope of the invention as defined by the appended claims.
11
Claims (6)
1. An apparatus for plasma-carburizing a workpiece of metal comprising: a carburizing chamber for carburizing the workpiece of metal by generatmg a plasma; a cooling chamber for quenching the workpiece of metal which is carburized by using the plasma; and a transfer means for mansferring the workpiece of metal from said carburizing chamber to said cooling chamber under the state that the workpiece of metal is released from said carburizing chamber at the normal temperature.
2. An apparatus for plasma-carburizing a workpiece of metal as claimed in claim 1, wherein said carburizing chamber includes a loading deck for loading the workpiece of metal and a lid for opening and closing said carburizing chamber, said loading deck being integrally formed with said lid.
3. An apparatus for plasma-carburizing a workpiece of metal as claimed in claim 2, wherein said loading deck and said lid is transferred to said cooling chamber at the same time and said lid further close and open said cooling chamber.
12
4. An apparatus for plasma-carburizing a workpiece of metal as claimed in claim 1,2 or 3, wherein said transfer means includes a shaft for transferring a workpiece upward and downward and a forked feed bar having an overhead crane for transferring a workpiece in the horizontal direction.
5. A method for plasma-carburizing a workpiece of metal, comprising the steps of: carburizing (S1) the workpiece of metal by generating a plasma within a carburizing chamber; releasing (S2) the workpiece of metal in steps (S1) from said carburizing chamber at the normal temperature; and quenching (S3) the workpiece of metal in steps (S2) in a cooling chamber.
6. A method for plasma-carburizing a workpiece of metal as claimed in claim 3, wherein a spending time for transferring the workpiece of metal in steps (S1) from said carburizing chamber to said cooling chamber is below two minutes.
13
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960029841A KR980009500A (en) | 1996-07-23 | 1996-07-23 | Apparatus and method for plasma carburizing a metal object to be treated |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9714827D0 GB9714827D0 (en) | 1997-09-17 |
| GB2315497A true GB2315497A (en) | 1998-02-04 |
Family
ID=19467212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9714827A Withdrawn GB2315497A (en) | 1996-07-23 | 1997-07-14 | Plasma-carburizing and quenching a metal workpiece involving transfer of workpiece |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH1068061A (en) |
| KR (1) | KR980009500A (en) |
| DE (1) | DE19729872A1 (en) |
| GB (1) | GB2315497A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010099259A (en) * | 2001-09-17 | 2001-11-09 | 박형호 | Manufacturing Apparatus and method of tantalum by continuous exchange type |
| FR2832735B1 (en) * | 2001-11-24 | 2006-06-23 | Bosch Gmbh Robert | DEVICE AND METHOD FOR DEPRESSION CEMENTATION |
| DE10209382B4 (en) * | 2002-03-02 | 2011-04-07 | Robert Bosch Gmbh | Method of carburizing components |
| KR100605362B1 (en) * | 2004-10-27 | 2006-07-28 | 재단법인 포항산업과학연구원 | A vacuum quenching furnace for heat treatment of metal powder in continuously great volume |
| CN105603359A (en) * | 2016-03-28 | 2016-05-25 | 福建上润精密仪器有限公司 | Glow ion carbonization method for enhancing surface hardness and corrosion resistance of stainless steel |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4152177A (en) * | 1977-02-03 | 1979-05-01 | General Motors Corporation | Method of gas carburizing |
| US4462577A (en) * | 1982-12-16 | 1984-07-31 | C.I. Hayes Inc. | Apparatus for gas cooling work parts under high pressure in a continuous heat treating vacuum furnace |
| US4836864A (en) * | 1983-12-27 | 1989-06-06 | Chugai Ro Co., Ltd. | Method of gas carburizing and hardening |
| JPH0266153A (en) * | 1988-08-29 | 1990-03-06 | Daido Steel Co Ltd | Plasma carburizing furnace |
| US5231645A (en) * | 1991-06-19 | 1993-07-27 | Toyota Jidosha Kabushiki Kaisha | Method of controlling continuous carburization furnace |
| US5273585A (en) * | 1990-03-27 | 1993-12-28 | Mazda Motor Corporation | Heat-treating apparatus |
| EP0723034A2 (en) * | 1995-01-20 | 1996-07-24 | Dowa Mining Co., Ltd. | A gas carburising process and an apparatus therefor |
-
1996
- 1996-07-23 KR KR1019960029841A patent/KR980009500A/en not_active Application Discontinuation
-
1997
- 1997-07-11 DE DE19729872A patent/DE19729872A1/en not_active Withdrawn
- 1997-07-14 GB GB9714827A patent/GB2315497A/en not_active Withdrawn
- 1997-07-15 JP JP9205367A patent/JPH1068061A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4152177A (en) * | 1977-02-03 | 1979-05-01 | General Motors Corporation | Method of gas carburizing |
| US4462577A (en) * | 1982-12-16 | 1984-07-31 | C.I. Hayes Inc. | Apparatus for gas cooling work parts under high pressure in a continuous heat treating vacuum furnace |
| US4836864A (en) * | 1983-12-27 | 1989-06-06 | Chugai Ro Co., Ltd. | Method of gas carburizing and hardening |
| JPH0266153A (en) * | 1988-08-29 | 1990-03-06 | Daido Steel Co Ltd | Plasma carburizing furnace |
| US5273585A (en) * | 1990-03-27 | 1993-12-28 | Mazda Motor Corporation | Heat-treating apparatus |
| US5231645A (en) * | 1991-06-19 | 1993-07-27 | Toyota Jidosha Kabushiki Kaisha | Method of controlling continuous carburization furnace |
| EP0723034A2 (en) * | 1995-01-20 | 1996-07-24 | Dowa Mining Co., Ltd. | A gas carburising process and an apparatus therefor |
Non-Patent Citations (1)
| Title |
|---|
| WPI Accession no 90-113449/199015 & JP 02 066 153 A * |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1068061A (en) | 1998-03-10 |
| KR980009500A (en) | 1998-04-30 |
| GB9714827D0 (en) | 1997-09-17 |
| DE19729872A1 (en) | 1998-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5868871A (en) | Method and apparatus for carburizing, quenching and tempering | |
| O'Brien et al. | Plasma(Ion) Nitriding | |
| US4160680A (en) | Vacuum carburizing | |
| GB2315497A (en) | Plasma-carburizing and quenching a metal workpiece involving transfer of workpiece | |
| US5324366A (en) | Heat treat furnace system for performing different carburizing processes simultaneously | |
| Rembges et al. | Process control of plasma nitriding and plasma nitrocarburizing in industry | |
| EP1149923B1 (en) | Apparatus for quenching metallic material | |
| EP0781858B2 (en) | Cementation method of metals | |
| Korecki et al. | Multi-purpose LPC+ LPN+ HPGQ 25 bar N2/He single chamber vacuum furnaces | |
| KR100592757B1 (en) | Method of gas carburizing | |
| JP3289949B2 (en) | Closed circulation gas quenching device and gas quenching method | |
| JPH0741848A (en) | Heat treatment furnace apparatus | |
| KR19980072371A (en) | Plasma Carburization Heat Treatment Apparatus And Method | |
| US7416614B2 (en) | Method of gas carburizing | |
| Minarski et al. | Quenching steel parts in 20-bar helium | |
| Sverdlin | Types of Heat Treating Furnaces | |
| JPS60208469A (en) | Continuous gas carburizing method and continuous gas carburizing furnace therefor | |
| JPH0874027A (en) | Carburization treatment | |
| JP2006137964A (en) | Continuous vacuum carburizing furnace | |
| JPS5811726A (en) | Bright quenching method | |
| JPS6233754A (en) | Gas carburizing heat treatment | |
| KR200242846Y1 (en) | Bright heat treatment furnace | |
| JP2003166016A (en) | Vacuum carburization apparatus | |
| Filice et al. | Advanced ausbay quenching | |
| Hardening | Localized Heat Treating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |