WO1995025182A1 - Verfahren und vorrichtung zum beeinflussen von mass- und formänderungen beim härten von werkstücken - Google Patents
Verfahren und vorrichtung zum beeinflussen von mass- und formänderungen beim härten von werkstücken Download PDFInfo
- Publication number
- WO1995025182A1 WO1995025182A1 PCT/EP1995/000913 EP9500913W WO9525182A1 WO 1995025182 A1 WO1995025182 A1 WO 1995025182A1 EP 9500913 W EP9500913 W EP 9500913W WO 9525182 A1 WO9525182 A1 WO 9525182A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- workpieces
- mandrel fixture
- mandrel
- hardening
- fixture
- Prior art date
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
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
-
- 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
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0025—Supports; Baskets; Containers; Covers
-
- 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
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
Definitions
- the invention relates to a method for influencing dimensional and shape changes when hardening, in particular, rotationally symmetrical workpieces.
- Hardness refers to a heat treatment in which the workpiece is cooled in a quenching medium, starting from the hardening temperature with an austenitic structure, in such a way that martensite is formed.
- warpage occurs, which can be subdivided into an unavoidable proportion resulting from structural changes and an avoidable proportion which depends on process-specific circumstances.
- the workpieces are placed on mechanical aids with a predetermined diameter immediately after carburizing and cooled in the quenching medium. In the course of this cooling, the workpieces shrink to this diameter with plastic and elastic deformation.
- dome fixtures are used in the context of the present invention.
- the object of the present invention is to simplify and reduce the cost of the known methods for influencing dimensional and shape changes during hardening using dome fixings.
- a method for influencing dimensional and shape changes during the hardening of workpieces according to the generic term, which comprises the process steps: stacking the workpieces on the mandrel fixture, carburizing and quenching the workpieces located on the mandrel fixture, and removing the workpieces from the Dornfixtur is marked.
- the proposed method is associated with a number of valuable advantages.
- the hardness results are highly reproducible. No complicated handling of the parts in the furnace is required. Due to the simplified process sequence, simpler and therefore cheaper ovens can be used.
- the furnaces can easily be loaded automatically. Different parts can be produced in a single batch of furnace. As a result of the simplification, there is great potential for savings compared to the previous costs of heat treatment.
- a mechanical aid according to the invention for hardening workpieces that shrink in a quenching medium to a predetermined diameter with plastic and elastic deformation consists in the fact that this aid is a mandrel fixture that does not carburize when the workpieces are carburized. Accordingly, the surface of the mandrel fixture is not converted into a hardness structure
- the coating can preferably be produced by nickel plating or copper plating.
- a thorn fixture with a high resistance to aging is characterized by the fact that it is made from a high-alloy steel.
- the process is based on the knowledge that time and cost savings when hardening workpieces in ongoing production can be achieved if the individual work steps: carburizing the workpieces, stacking the workpieces on the mandrel fixture and quenching with plastic and elastic deformation of the workpieces , can be combined with one another in a process sequence.
- the hardening process according to the invention is composed of the steps: stacking the workpieces on a mandrel fixture, carburizing and quenching the workpieces.
- the mandrel fixture and the workpieces to be hardened are hardened brought temperature. When quenching under oil, the workpieces shrink onto the mandrel fixture.
- the mandrel fixture takes longer to quench (to the oil temperature). Because of the difference in volume due to the temperature gradient between the workpieces and the mandrel fixture, the workpieces initially shrink - with predominantly plastic deformation - to a larger diameter of the mandrel fixture. As the cooling continues, the diameter of the mandrel fixture decreases, with the workpiece following this change in diameter. In this section of the process, plastic deformation can again take place, which, however, is significantly less, measured in terms of the proportion of plastic deformation in the first process step. In order to keep the workpieces flat during quenching, it is advantageous to weight the workpieces with a weight after stacking them on the mandrel fixture. After the final quenching of the workpieces, the mandrel fixture shrinks to its original size, so that the workpieces can be easily removed from the mandrel fixture.
- the proposed method requires a mandrel fixture that does not carburize when the workpieces are carburized. H. there is no conversion of the surface of the mandrel fixture into a hardness structure. To prevent this carburizing of the mandrel fixture, it can be nickel-plated or copper-plated, for example. As an alternative to this, the mandrel fixture can be made from a high-alloy steel which does not follow the process of conversion into a hardness structure.
- both a nickel-plated and copper-plated surface of the mandrel fixture and a mandrel fixture made of a high-alloy steel have shown excellent aging resistance in practical applications.
- the advantages of the method according to the invention are that the hardness results are very reproducible.
- the elaborate handling of the workpieces in the furnace, as is sometimes the case with the known methods, is eliminated.
- Simpler and therefore cheaper ovens can be used.
- the loading of the furnaces can be automated with simple means. A chaotic production of different parts in one furnace batch is possible.
- the process is characterized by a high saving potential.
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)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Forging (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59504224T DE59504224D1 (de) | 1994-03-16 | 1995-03-11 | Verfahren zum beeinflussen von mass- und formänderungen beim härten von werkstücken |
JP7523826A JPH09510261A (ja) | 1994-03-16 | 1995-03-11 | ワークを焼入れする際の寸法変化および形状変化を制御するための方法および装置 |
BR9507081A BR9507081A (pt) | 1994-03-16 | 1995-03-11 | Processo e dispositivo para influenciar variações de dimensão e de forma por ocasião da têmpera de peças a trabalhar |
KR1019960704868A KR970701794A (ko) | 1994-03-16 | 1995-03-11 | 가공편의 경화시에 칫수변동과 형상변동에 영향을 미치기 위한 방법 및 장치 |
EP95912245A EP0750683B1 (de) | 1994-03-16 | 1995-03-11 | Verfahren zum beeinflussen von mass- und formänderungen beim härten von werkstücken |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4408924A DE4408924A1 (de) | 1994-03-16 | 1994-03-16 | Verfahren und Vorrichtung zum Beeinflussen von Maß- und Formänderungen beim Härten von Werkstücken |
DEP4408924.4 | 1994-03-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995025182A1 true WO1995025182A1 (de) | 1995-09-21 |
Family
ID=6512943
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1995/000913 WO1995025182A1 (de) | 1994-03-16 | 1995-03-11 | Verfahren und vorrichtung zum beeinflussen von mass- und formänderungen beim härten von werkstücken |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0750683B1 (de) |
JP (1) | JPH09510261A (de) |
KR (1) | KR970701794A (de) |
AT (1) | ATE173300T1 (de) |
BR (1) | BR9507081A (de) |
DE (2) | DE4408924A1 (de) |
ES (1) | ES2124537T3 (de) |
WO (1) | WO1995025182A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103032069B (zh) * | 2012-10-22 | 2015-01-14 | 安徽省皖江机电设备制造有限公司 | 一种采煤机截齿的生产方法 |
CN103447758A (zh) * | 2013-07-18 | 2013-12-18 | 陕西奥邦锻造有限公司 | 一种截齿硬质合金钎焊和热处理一体化的工艺方法 |
CN112522499B (zh) * | 2020-11-11 | 2022-08-02 | 中国航发中传机械有限公司 | 一种航空用斜幅板圆柱齿轮的热处理方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3177563A (en) * | 1960-06-28 | 1965-04-13 | Laval Turbine | Method of treating gears and the like |
US4212690A (en) * | 1979-03-23 | 1980-07-15 | Nasa | Heat treat fixture and method of heat treating |
DE3125992A1 (de) * | 1981-06-19 | 1983-01-05 | Maag-Zahnräder & -Maschinen AG, 8023 Zürich | Verfahren zur verringerung des haerteverzugs beim einsatzhaerten grosser zahnkraenze aus stahlund hierfuer geeigneter stuetzkoerper |
FR2593192A1 (fr) * | 1986-01-20 | 1987-07-24 | Stein Heurtey | Installation de chauffage et de trempe sous presse de pieces metalliques |
DE3906217C1 (en) * | 1989-02-28 | 1989-11-23 | Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De | Rod- or ring-shaped workpiece-adapted receiving device for rotationally symmetrical workpieces |
WO1992007100A1 (de) * | 1990-10-15 | 1992-04-30 | Zahnradfabrik Friedrichshafen Ag | Verfahren und vorrichtung zum beeinflussen von mass- und formänderungen beim härten von werkstücken |
-
1994
- 1994-03-16 DE DE4408924A patent/DE4408924A1/de not_active Withdrawn
-
1995
- 1995-03-11 WO PCT/EP1995/000913 patent/WO1995025182A1/de active IP Right Grant
- 1995-03-11 EP EP95912245A patent/EP0750683B1/de not_active Expired - Lifetime
- 1995-03-11 AT AT95912245T patent/ATE173300T1/de not_active IP Right Cessation
- 1995-03-11 KR KR1019960704868A patent/KR970701794A/ko not_active Application Discontinuation
- 1995-03-11 BR BR9507081A patent/BR9507081A/pt not_active IP Right Cessation
- 1995-03-11 DE DE59504224T patent/DE59504224D1/de not_active Expired - Fee Related
- 1995-03-11 ES ES95912245T patent/ES2124537T3/es not_active Expired - Lifetime
- 1995-03-11 JP JP7523826A patent/JPH09510261A/ja active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3177563A (en) * | 1960-06-28 | 1965-04-13 | Laval Turbine | Method of treating gears and the like |
US4212690A (en) * | 1979-03-23 | 1980-07-15 | Nasa | Heat treat fixture and method of heat treating |
DE3125992A1 (de) * | 1981-06-19 | 1983-01-05 | Maag-Zahnräder & -Maschinen AG, 8023 Zürich | Verfahren zur verringerung des haerteverzugs beim einsatzhaerten grosser zahnkraenze aus stahlund hierfuer geeigneter stuetzkoerper |
FR2593192A1 (fr) * | 1986-01-20 | 1987-07-24 | Stein Heurtey | Installation de chauffage et de trempe sous presse de pieces metalliques |
DE3906217C1 (en) * | 1989-02-28 | 1989-11-23 | Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De | Rod- or ring-shaped workpiece-adapted receiving device for rotationally symmetrical workpieces |
WO1992007100A1 (de) * | 1990-10-15 | 1992-04-30 | Zahnradfabrik Friedrichshafen Ag | Verfahren und vorrichtung zum beeinflussen von mass- und formänderungen beim härten von werkstücken |
Also Published As
Publication number | Publication date |
---|---|
EP0750683B1 (de) | 1998-11-11 |
DE4408924A1 (de) | 1995-09-21 |
DE59504224D1 (de) | 1998-12-17 |
BR9507081A (pt) | 1997-09-16 |
ES2124537T3 (es) | 1999-02-01 |
EP0750683A1 (de) | 1997-01-02 |
KR970701794A (ko) | 1997-04-12 |
JPH09510261A (ja) | 1997-10-14 |
ATE173300T1 (de) | 1998-11-15 |
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