EP0947589B1 - Procédé de traitement d'une pièce d'acier - Google Patents

Procédé de traitement d'une pièce d'acier Download PDF

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Publication number
EP0947589B1
EP0947589B1 EP99103230A EP99103230A EP0947589B1 EP 0947589 B1 EP0947589 B1 EP 0947589B1 EP 99103230 A EP99103230 A EP 99103230A EP 99103230 A EP99103230 A EP 99103230A EP 0947589 B1 EP0947589 B1 EP 0947589B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
depth
temperature
steel
spring
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 - Lifetime
Application number
EP99103230A
Other languages
German (de)
English (en)
Other versions
EP0947589A1 (fr
Inventor
Jakob Betzold
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP0947589A1 publication Critical patent/EP0947589A1/fr
Application granted granted Critical
Publication of EP0947589B1 publication Critical patent/EP0947589B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment

Definitions

  • JP 61079719 A heat a steel workpiece to 800 ° C. then cool in a bath to 300 ° C to 550 ° C and then one Undergo shot peening. Furthermore, it is known from JP 60258409 A to keep a metal workpiece at a temperature between 50 ° C and 300 ° C, whereby and undergo shot peening. the shot is lower Temperature and thereby cools a surface of the workpiece.
  • the present invention has for its object a method of to improve the above type in that by a higher depth of penetration of compressive stresses a higher mechanical strength according to the machined workpiece according to the invention is achieved.
  • the workpiece on after hardening a first temperature in the range 500 ° C to 600 ° C warmed and immediately after the heating is treated with a jet of solid particles, whereby an edge layer with a depth d of 500 ⁇ m is plastified and faster than a core inside the workpiece to a second temperature of 50 ° C to 200 ° C is cooled.
  • the steel is spring steel and the workpiece is preferably a connecting rod, an axle spring, a valve spring or a leaf spring.
  • Fig. 1 shows an example of a workpiece a section of a connecting rod 10, which with the method according to the invention was treated.
  • the material strength is preheated, for example in an oven, initially decreased.
  • the workpiece 10 is essentially still at the preheat temperature.
  • Impinging jet pitching or jet grains now cause increased plasticization of a material that is still hot Edge layer 12, which is shown in Fig. 1 with the depth d. By blasting the edge layer 12 cools down faster than a core 14 during the blasting treatment inside the workpiece 10.
  • the workpiece 10 is still in a preheated state Workpiece temperature of, for example, 500 to 600 ° C with a particle beam treated, the blasting cooling the surface layer 12 to a temperature of, for example, 100 ° C. at the end of the treatment, whereas the core 14 still has a temperature of, for example,> 200 ° C.
  • the workpiece for example temper resistant steel, especially spring steel, is hardened, in whole or in part in an oven atmosphere heated to 500 to 600 ° C and out of the oven atmosphere immediately particle or shot peened until the edge temperature reaches approx. 100 ° C has dropped.
  • the workpiece then slowly becomes active (e.g. by cooling) or cooled passively (e.g. by heat radiation).
  • a connecting rod with a smaller cross section with the same mechanical Strength can be achieved as a conventionally manufactured connecting rod, with a Weight saving of> 30% results.
  • the hot blasting treatment according to the invention can also be transferred to other components, such as a spring (axle spring, valve spring, leaf spring), whereby one weight-optimized springs.
  • a spring anle spring, valve spring, leaf spring
  • the radiation at temperatures of approximately. ⁇ 500 ° C plastification until the surface layer 12 is colder than the core 14, which creates a favorable residual stress distribution.
  • This means for Properties of workpieces treated in such a way that a higher load capacity and / or a weight saving is achieved. Basically, this procedure is all workpieces treated with a particle beam can be used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (5)

  1. Procédé d'usinage d'une pièce en acier, en particulier pour un véhicule automobile, caractérisé en ce que la pièce est échauffée après le durcissement à une première température dans le domaine de 500°C à 600°C et en ce qu'elle est traitée immédiatement après l'échauffement à l'aide d'un jet de particules de matières solides, une couche superficielle étant de ce fait plastifiée sur une profondeur d de 0,5 mm et étant refroidie, plus rapidement qu'un coeur à l'intérieur de la pièce, à une deuxième température de 50°C à 200°C, de telle manière qu'à une profondeur de 0,5 mm, la courbe en profondeur (20) de la contrainte interne ait un passage par zéro.
  2. Procédé selon la revendication 1, caractérisé en ce que les particules de matières solides sont des billes et/ou des grains de sable.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la deuxième température a une valeur de moins de 125°C.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'acier est un acier à ressorts.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la pièce est une bielle, un ressort d'essieu, un ressort de soupape ou un ressort à lames.
EP99103230A 1998-03-31 1999-02-19 Procédé de traitement d'une pièce d'acier Expired - Lifetime EP0947589B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19814299A DE19814299A1 (de) 1998-03-31 1998-03-31 Verfahren zum Bearbeiten eines Werkstücks aus Metall
DE19814299 1998-03-31

Publications (2)

Publication Number Publication Date
EP0947589A1 EP0947589A1 (fr) 1999-10-06
EP0947589B1 true EP0947589B1 (fr) 2002-11-27

Family

ID=7863044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99103230A Expired - Lifetime EP0947589B1 (fr) 1998-03-31 1999-02-19 Procédé de traitement d'une pièce d'acier

Country Status (2)

Country Link
EP (1) EP0947589B1 (fr)
DE (2) DE19814299A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011004732B4 (de) 2010-10-19 2023-09-21 Kia Motors Corporation Hochfeste Ventilfeder für einen Fahrzeugmotor und Verfahren zur Herstellung derselben

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850867C2 (de) * 1997-11-04 2003-10-23 Nsk Ltd Stufenloses Toroidgetriebe
DE19861260B4 (de) * 1997-11-04 2005-09-22 Nsk Ltd. Stufenlos verstellbares Toroidgetriebe
DE102017007801A1 (de) * 2017-08-17 2019-02-21 Linde Aktiengesellschaft Verfahren und Vorrichtung zum Verfestigungsstrahlen oder Verfestigungswalzen

Family Cites Families (19)

* Cited by examiner, † Cited by third party
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JPS5827956A (ja) * 1981-08-11 1983-02-18 Aichi Steel Works Ltd 耐へたり性の優れたばね用鋼
DE3142270C2 (de) * 1981-10-24 1983-10-20 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Verfahren zum Verbessern der Festigkeit von Werkstückoberflächen
JPS58188532A (ja) * 1982-04-28 1983-11-04 Nhk Spring Co Ltd 中空スタビライザの製造方法
DE3369082D1 (en) * 1982-10-12 1987-02-19 Nippon Kokan Kk Method and apparatus for removing fine cold shut cracks on horizontally and continuously cast steel strand using ejection of a plurality of metal shot
JPS60162727A (ja) * 1984-02-06 1985-08-24 Komatsu Ltd 加工熱処理法
JPS60258409A (ja) * 1984-06-06 1985-12-20 Toyota Motor Corp シヨツトピ−ニングによる金属の表面処理方法
JPS6179719A (ja) * 1984-09-27 1986-04-23 Komatsu Ltd 加工熱処理法
JPS61124521A (ja) * 1984-11-22 1986-06-12 Komatsu Ltd 加工熱処理法
IT1216347B (it) * 1986-11-20 1990-02-22 Necchi Spa Procedimento per ottenere getti in ghisa sferoidale bainitica
US5100482A (en) * 1989-12-05 1992-03-31 Horikiri Spring Mfg., Co., Ltd. Method of preparing a leaf spring
DE4015205C1 (en) * 1990-05-11 1991-08-22 Mtu Muenchen Gmbh Method of reinforcing gas turbine rotor - has balls forced against base surface of slot in rotor to compress it
JP2915163B2 (ja) * 1991-03-30 1999-07-05 同和鉱業株式会社 強度向上表面処理方法
JPH0578798A (ja) * 1991-09-24 1993-03-30 Mazda Motor Corp アルミニウム合金製部材の表面改質方法
JP3262352B2 (ja) * 1991-11-18 2002-03-04 日本発条株式会社 高強度ばねの製造方法
JPH0641631A (ja) * 1992-07-23 1994-02-15 Kobe Steel Ltd ばねの強化方法
US5284039A (en) * 1993-01-25 1994-02-08 Minnesota Mining And Manufacturing Company Spacer for rotary peening apparatus
DE4330832C2 (de) * 1993-09-11 1996-04-04 Hoesch Federn Gmbh Verfahren zur Optimierung der Eigenspannungsverteilung im Stabquerschnitt von Schraubendruckfedern
DE4415094B4 (de) * 1994-04-29 2006-05-11 Ald Vacuum Technologies Ag Verfahren und Vorrichtung zum Behandeln von Werkstücken durch Partikelstrahlen
DE19518365C2 (de) * 1995-05-22 2002-03-14 Ihd Inst Fuer Holztechnologie Verfahren zum Glätten von Holz und Holzwerkstoffen unter Verwendung von rotierenden schneidenlosen Werkzeugen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011004732B4 (de) 2010-10-19 2023-09-21 Kia Motors Corporation Hochfeste Ventilfeder für einen Fahrzeugmotor und Verfahren zur Herstellung derselben

Also Published As

Publication number Publication date
DE59903505D1 (de) 2003-01-09
EP0947589A1 (fr) 1999-10-06
DE19814299A1 (de) 1999-10-07

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