US20060266436A1 - Carburizing method - Google Patents
Carburizing method Download PDFInfo
- Publication number
- US20060266436A1 US20060266436A1 US11/436,564 US43656406A US2006266436A1 US 20060266436 A1 US20060266436 A1 US 20060266436A1 US 43656406 A US43656406 A US 43656406A US 2006266436 A1 US2006266436 A1 US 2006266436A1
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- US
- United States
- Prior art keywords
- region
- carburizing
- gear
- ferrous metal
- metal article
- 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.)
- Abandoned
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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
- C23C8/04—Treatment of selected surface areas, e.g. using masks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
Definitions
- This invention relates to systems and methods of carburizing. More specifically, the invention relates to systems and methods for carburizing ferrous metal articles to cause different carbon content at different locations.
- Carburizing is a widely known region or surface hardening process.
- the process involves diffusing carbon into a low carbon steel alloy to form a high carbon steel region or surface.
- the diffused carbon normally reacts with alloys of the steel to enhance the hardness of the steel surface.
- the diffused carbon normally reacts with alloys of the steel to enhance the hardness of the steel surface.
- Carburizing may result in a component that has a high surface hardness and a softer core. Carburizing, therefore, may be especially useful for treating high wear components such as gears and shafts.
- Enhanced surface hardness may provide suitable resistance to frictional and impact wear without sacrificing desirable properties of the bulk material.
- Carburizing is generally performed by heating parts in a furnace in the presence of an atmosphere capable of diffusing carbon into the surface of the parts.
- the amount or percent of carbon is controlled by the composition of the atmosphere.
- the depth of diffusion of carbon into the steel may be controlled by the temperature of the component and time of exposure to an environment containing carbon.
- a part to be carburized is heated in a furnace to a desired carburizing temperature in an environment including carbon.
- the work may be either slow-cooled for later quench hardening, or quenched directly into various gaseous or liquid quenches. Because carbon has been diffused into the surface this area of the part hardens to a very high hardness while the core hardens to an intermediate hardness level.
- the entire surface of the part is carburized although ceramic paints can be used to prevent carburization in certain areas if desired.
- the carburized case is relatively uniform in composition and in depth around the part.
- the invention is a process for selectively carburizing (tailored carburizing) ferrous metal article, such as a gear.
- the process of the present invention includes two similar but separate methods.
- the first method includes the steps of: first, masking an region or area of the article with an appropriate masking material, and conducting a first carburizing operation of the article. Then, the masking material is removed from the article and a second carburizing operation of the article is conducted.
- the resulting carburized article will have a lighter case with a lower carbon content in the masked region or area of the article.
- the second method includes the steps of: masking an area of the article with a coating material which would inhibit carbon diffusion in the masked region or area but not completely stop it. Then, the article is carburized. Finally, the inhibiting agent is removed.
- the resulting carburized article will have a lighter case with a lower carbon content in the masked region of the article.
- FIG. 1A is a schematic of the first step of masking the root area for the first methodology of the present carburizing invention.
- FIG. 1B is a schematic of the second step of carburizing the exposed area for the first methodology of the present carburizing invention.
- FIG. 1C is a schematic of the third step of removing mask included in the first methodology of the present carburizing invention.
- FIG. 1D is a schematic of the fourth step of re-carburizing the tooth to include the root area as set forth in the first methodology of the present carburizing invention.
- FIG. 2A is a schematic of the first step of applying an inhibiting agent to the root area for the second methodology of the present carburizing invention.
- FIG. 2B is a schematic of the second step of carburizing the entire tooth including the area having the inhibiting agent according to the second methodology of the present carburizing invention.
- FIG. 2C is a schematic of the third step of removing the inhibiting agent according to the second methodology of the present carburizing invention.
- This invention is to tailor the case depth and carbon content of the case differently for various portions of a part rather than to take what the carburizing process provides. This is intended to maximize the performance of a part in different areas. For example on a gear tooth a lighter case depth and lower carbon content could be used in the root area to improve bending properties while a deeper case and higher carbon content could be used on the tooth face to improve contact properties.
- the tooth face could be carburized to a higher carbon content and deeper depth with the root area masked off.
- FIG. 1A is a schematic of the first step of masking the root area for the first methodology of the present carburizing invention.
- the masking agent 20 receives the masking agent 20 .
- this covering surface is then covered with an agent preventing such carbonization, such as, for example, the trade product available under the name Condursal®.
- agent is a high temperature resistant mixture of sand and oil.
- the agent can be any material that is removable after heat treatment and prevents ingress of the carburizing gas to the welding zone.
- agent can be selected from the group consisting of Condursal®, high temperature microcrystalline wax, high temperature resistant lacquer, carbon stop-off paint, ceramic paint and other agents known to those of skill in the art.
- the second step of this first method includes carburizing the exposed area 30 of the gear teeth 10 to 1.2 mm case depth and surface carbon of 0.90%.
- the masking agent 20 is removed from the root 12 (see FIG. 1C ), and the gear teeth are re-carburized including the root area as shown in FIG. 1D to include the root areas at 0.4 mm case depth and surface carbon of 0.60% for the root areas.
- a modified carburizing operation could follow the steps of FIGS. 1A-1D , but it would put a lighter case with lower carbon content in the root area.
- the first carburizing operation would preferably be at a carbon content higher than actually desired so that the diffusion that takes place during the second operation would bring the carbon content down to the desired level.
- Another potential method for tailoring the carburized case would be to use a coating which would inhibit carbon diffusion in certain areas of the part rather than completely stop it or mask the area. This second preferred process would follow the steps illustrated by FIGS. 2A-2C .
- FIG. 2A is a schematic of the first step of applying an inhibiting agent to the root area for the second methodology of the present carburizing invention.
- the inhibiting agent would block some carbonization, but not all.
- a nickel plating material is the preferred inhibiting agent; however, other materials that suitably partially block carbonization will satisfy the parameters of this invention.
- the gear teeth 10 a including the area having the inhibiting agent 20 a is carburized according to the second methodology of the present carburizing invention. As a result, the exposed area 10 a and treated area 20 a is carburized to different degrees.
- FIG. 1 is a schematic of the first step of applying an inhibiting agent to the root area for the second methodology of the present carburizing invention.
- the inhibiting agent would block some carbonization, but not all.
- a nickel plating material is the preferred inhibiting agent; however, other materials that suitably partially block carbonization will satisfy the parameters of this invention.
- the gear teeth 10 a including the area having the inhibiting agent 20 a is carburized according to the
- 2C is a schematic of the third step of removing the inhibiting agent with the resulting carburization at the tooth 30 resulting in a case depth of approximately 1.2 mm and a surface carbon of approximately 0.90%, while resulting in a case depth of approximately 0.4 mm and a surface carbon of approximately 0.60% at the root area 40 .
- the invention is a process for selectively carburizing (tailored carburizing) a ferrous metal article, such as a steel gear.
- the process of the present invention includes two similar but separate methods:
- the first method includes the steps of: first, masking the roots of the gear with an appropriate masking material, and conducting a first carburizing operation of the gear. Then, the masking material is removed from the gear roots and a second carburizing operation of the gear is conducted. The resulting carburized gear will have a lighter case with a lower carbon content in the root areas of the gear;
- the second method includes the steps of: masking the root areas of the gear with a coating material which would inhibit carbon diffusion in the root areas but not completely stop it. Then, carburizing the gear. The resulting carburized gear will have a lighter case with a lower carbon content in the root areas of the gear.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
- Gears, Cams (AREA)
Abstract
Description
- This application claims the benefit under 35 U.S.C. § 119 of U.S. provisional application Ser. No. 60/684,528 filed May 26, 2005, which is hereby incorporated by reference.
- 1. Field of the Invention
- This invention relates to systems and methods of carburizing. More specifically, the invention relates to systems and methods for carburizing ferrous metal articles to cause different carbon content at different locations.
- 2. Description of Related Art
- Carburizing is a widely known region or surface hardening process. The process involves diffusing carbon into a low carbon steel alloy to form a high carbon steel region or surface. The diffused carbon normally reacts with alloys of the steel to enhance the hardness of the steel surface. The diffused carbon normally reacts with alloys of the steel to enhance the hardness of the steel surface. Carburizing may result in a component that has a high surface hardness and a softer core. Carburizing, therefore, may be especially useful for treating high wear components such as gears and shafts. Enhanced surface hardness may provide suitable resistance to frictional and impact wear without sacrificing desirable properties of the bulk material.
- Carburizing is generally performed by heating parts in a furnace in the presence of an atmosphere capable of diffusing carbon into the surface of the parts. The amount or percent of carbon is controlled by the composition of the atmosphere. The depth of diffusion of carbon into the steel may be controlled by the temperature of the component and time of exposure to an environment containing carbon. Most often, a part to be carburized is heated in a furnace to a desired carburizing temperature in an environment including carbon. After carburizing, the work may be either slow-cooled for later quench hardening, or quenched directly into various gaseous or liquid quenches. Because carbon has been diffused into the surface this area of the part hardens to a very high hardness while the core hardens to an intermediate hardness level. Normally the entire surface of the part is carburized although ceramic paints can be used to prevent carburization in certain areas if desired. The carburized case is relatively uniform in composition and in depth around the part.
- The need exists for useful method to tailor the case depth and carbon content of the case differently for various portions of a part rather than to take what the carburizing process provides.
- The invention is a process for selectively carburizing (tailored carburizing) ferrous metal article, such as a gear. The process of the present invention includes two similar but separate methods. The first method includes the steps of: first, masking an region or area of the article with an appropriate masking material, and conducting a first carburizing operation of the article. Then, the masking material is removed from the article and a second carburizing operation of the article is conducted. The resulting carburized article will have a lighter case with a lower carbon content in the masked region or area of the article. The second method includes the steps of: masking an area of the article with a coating material which would inhibit carbon diffusion in the masked region or area but not completely stop it. Then, the article is carburized. Finally, the inhibiting agent is removed. The resulting carburized article will have a lighter case with a lower carbon content in the masked region of the article.
-
FIG. 1A is a schematic of the first step of masking the root area for the first methodology of the present carburizing invention. -
FIG. 1B is a schematic of the second step of carburizing the exposed area for the first methodology of the present carburizing invention. -
FIG. 1C is a schematic of the third step of removing mask included in the first methodology of the present carburizing invention. -
FIG. 1D is a schematic of the fourth step of re-carburizing the tooth to include the root area as set forth in the first methodology of the present carburizing invention. -
FIG. 2A is a schematic of the first step of applying an inhibiting agent to the root area for the second methodology of the present carburizing invention. -
FIG. 2B is a schematic of the second step of carburizing the entire tooth including the area having the inhibiting agent according to the second methodology of the present carburizing invention. -
FIG. 2C is a schematic of the third step of removing the inhibiting agent according to the second methodology of the present carburizing invention. - It has been shown that the performance of a carburized part is dependent on the percent of carbon in the case as well as the depth of the case. For example, in bending of a gear tooth a lighter or shallower case is better for strength and impact. However, for contact strength and durability on the face of a gear tooth, a deeper case is preferred. Likewise for maximum bending fatigue life, lower carbon content in the case is better. However, for maximum contact fatigue life a higher percentage of carbon is better.
- This invention is to tailor the case depth and carbon content of the case differently for various portions of a part rather than to take what the carburizing process provides. This is intended to maximize the performance of a part in different areas. For example on a gear tooth a lighter case depth and lower carbon content could be used in the root area to improve bending properties while a deeper case and higher carbon content could be used on the tooth face to improve contact properties.
- One method of tailoring the carburized case in different areas of the part would be separate carburizing operations. The tooth face could be carburized to a higher carbon content and deeper depth with the root area masked off.
-
FIG. 1A is a schematic of the first step of masking the root area for the first methodology of the present carburizing invention. As shown inFIG. 1A , only the root area of thegear teeth 10 receives themasking agent 20. For this purpose, this covering surface is then covered with an agent preventing such carbonization, such as, for example, the trade product available under the name Condursal®. Such agent is a high temperature resistant mixture of sand and oil. The agent can be any material that is removable after heat treatment and prevents ingress of the carburizing gas to the welding zone. Such agent can be selected from the group consisting of Condursal®, high temperature microcrystalline wax, high temperature resistant lacquer, carbon stop-off paint, ceramic paint and other agents known to those of skill in the art. With reference toFIG. 1B , the second step of this first method includes carburizing the exposedarea 30 of thegear teeth 10 to 1.2 mm case depth and surface carbon of 0.90%. Next, the maskingagent 20 is removed from the root 12 (seeFIG. 1C ), and the gear teeth are re-carburized including the root area as shown inFIG. 1D to include the root areas at 0.4 mm case depth and surface carbon of 0.60% for the root areas. - A modified carburizing operation could follow the steps of
FIGS. 1A-1D , but it would put a lighter case with lower carbon content in the root area. The first carburizing operation would preferably be at a carbon content higher than actually desired so that the diffusion that takes place during the second operation would bring the carbon content down to the desired level. - Another potential method for tailoring the carburized case would be to use a coating which would inhibit carbon diffusion in certain areas of the part rather than completely stop it or mask the area. This second preferred process would follow the steps illustrated by
FIGS. 2A-2C . -
FIG. 2A is a schematic of the first step of applying an inhibiting agent to the root area for the second methodology of the present carburizing invention. The inhibiting agent would block some carbonization, but not all. A nickel plating material is the preferred inhibiting agent; however, other materials that suitably partially block carbonization will satisfy the parameters of this invention. As shown inFIG. 2B , thegear teeth 10 a including the area having the inhibitingagent 20 a is carburized according to the second methodology of the present carburizing invention. As a result, the exposedarea 10 a and treatedarea 20 a is carburized to different degrees.FIG. 2C is a schematic of the third step of removing the inhibiting agent with the resulting carburization at thetooth 30 resulting in a case depth of approximately 1.2 mm and a surface carbon of approximately 0.90%, while resulting in a case depth of approximately 0.4 mm and a surface carbon of approximately 0.60% at the root area 40. - As described above, the invention is a process for selectively carburizing (tailored carburizing) a ferrous metal article, such as a steel gear. By way of example, the process of the present invention includes two similar but separate methods:
- 1) the first method includes the steps of: first, masking the roots of the gear with an appropriate masking material, and conducting a first carburizing operation of the gear. Then, the masking material is removed from the gear roots and a second carburizing operation of the gear is conducted. The resulting carburized gear will have a lighter case with a lower carbon content in the root areas of the gear;
- 2) the second method includes the steps of: masking the root areas of the gear with a coating material which would inhibit carbon diffusion in the root areas but not completely stop it. Then, carburizing the gear. The resulting carburized gear will have a lighter case with a lower carbon content in the root areas of the gear.
- While the foregoing method has been shown and described with reference to several preferred embodiments, it will be understood by those of skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention. Applicant has chosen to use a gear as the exemplary article; however, the processes of the present invention may be applied to a variety of ferrous metal articles.
Claims (14)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/436,564 US20060266436A1 (en) | 2005-05-26 | 2006-05-19 | Carburizing method |
DE102006024441A DE102006024441A1 (en) | 2005-05-26 | 2006-05-24 | carburizing |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US68452805P | 2005-05-26 | 2005-05-26 | |
US11/436,564 US20060266436A1 (en) | 2005-05-26 | 2006-05-19 | Carburizing method |
Publications (1)
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US20060266436A1 true US20060266436A1 (en) | 2006-11-30 |
Family
ID=37387906
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/436,564 Abandoned US20060266436A1 (en) | 2005-05-26 | 2006-05-19 | Carburizing method |
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US (1) | US20060266436A1 (en) |
DE (1) | DE102006024441A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110059822A1 (en) * | 2006-03-24 | 2011-03-10 | Geiman Timothy E | Powder Forged Differential Gear |
CN103556103A (en) * | 2013-09-30 | 2014-02-05 | 福建龙溪轴承(集团)股份有限公司 | Anti-carburizing material and preparation method thereof |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7827692B2 (en) | 2006-03-24 | 2010-11-09 | Gkn Sinter Metals, Inc. | Variable case depth powder metal gear and method thereof |
DE112007003622B4 (en) | 2007-08-17 | 2020-08-06 | Gkn Sinter Metals, Llc. | Method of obtaining a gear with varying case hardness depth |
DE102008032656A1 (en) * | 2008-07-10 | 2010-01-14 | Bayerische Motoren Werke Aktiengesellschaft | Coating method for gearwheels comprises masking troughs between adjacent teeth on wheels so that only sides of teeth are coated |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3885995A (en) * | 1973-04-10 | 1975-05-27 | Boeing Co | Process for carburizing high alloy steels |
US4533400A (en) * | 1983-06-29 | 1985-08-06 | The Garrett Corporation | Method and apparatus for laser hardening of steel |
US4539461A (en) * | 1983-12-21 | 1985-09-03 | The Garrett Corporation | Method and apparatus for laser gear hardening |
US5785771A (en) * | 1997-05-02 | 1998-07-28 | Sikorsky Aircraft Corporation | Method for manufacturing precision gears |
US6074481A (en) * | 1997-05-02 | 2000-06-13 | Sikorsky Aircraft Corporation | Masking tool for manufacturing precision gears |
-
2006
- 2006-05-19 US US11/436,564 patent/US20060266436A1/en not_active Abandoned
- 2006-05-24 DE DE102006024441A patent/DE102006024441A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3885995A (en) * | 1973-04-10 | 1975-05-27 | Boeing Co | Process for carburizing high alloy steels |
US4533400A (en) * | 1983-06-29 | 1985-08-06 | The Garrett Corporation | Method and apparatus for laser hardening of steel |
US4539461A (en) * | 1983-12-21 | 1985-09-03 | The Garrett Corporation | Method and apparatus for laser gear hardening |
US5785771A (en) * | 1997-05-02 | 1998-07-28 | Sikorsky Aircraft Corporation | Method for manufacturing precision gears |
US6074481A (en) * | 1997-05-02 | 2000-06-13 | Sikorsky Aircraft Corporation | Masking tool for manufacturing precision gears |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110059822A1 (en) * | 2006-03-24 | 2011-03-10 | Geiman Timothy E | Powder Forged Differential Gear |
US8517884B2 (en) | 2006-03-24 | 2013-08-27 | Gkn Sinter Metals, Llc | Powder forged differential gear |
CN103556103A (en) * | 2013-09-30 | 2014-02-05 | 福建龙溪轴承(集团)股份有限公司 | Anti-carburizing material and preparation method thereof |
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Publication number | Publication date |
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DE102006024441A1 (en) | 2006-11-30 |
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