EP0990708A1 - Procédé de fabrication de ressorts à boudin - Google Patents

Procédé de fabrication de ressorts à boudin Download PDF

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Publication number
EP0990708A1
EP0990708A1 EP98118691A EP98118691A EP0990708A1 EP 0990708 A1 EP0990708 A1 EP 0990708A1 EP 98118691 A EP98118691 A EP 98118691A EP 98118691 A EP98118691 A EP 98118691A EP 0990708 A1 EP0990708 A1 EP 0990708A1
Authority
EP
European Patent Office
Prior art keywords
shot peening
coil springs
springs
stage
carried out
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
Application number
EP98118691A
Other languages
German (de)
English (en)
Other versions
EP0990708B1 (fr
Inventor
Josef Wienand
Gerhard Mier
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.)
ThyssenKrupp Technologies AG
Original Assignee
ThyssenKrupp Automotive AG
Thyssen Krupp Automotive GmbH
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 ThyssenKrupp Automotive AG, Thyssen Krupp Automotive GmbH filed Critical ThyssenKrupp Automotive AG
Priority to EP98118691A priority Critical patent/EP0990708B1/fr
Priority to AT98118691T priority patent/ATE235567T1/de
Priority to DE59807656T priority patent/DE59807656D1/de
Priority to PT98118691T priority patent/PT990708E/pt
Priority to ES98118691T priority patent/ES2190562T3/es
Publication of EP0990708A1 publication Critical patent/EP0990708A1/fr
Application granted granted Critical
Publication of EP0990708B1 publication Critical patent/EP0990708B1/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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
    • 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
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving

Definitions

  • the invention relates to a method for producing Coil springs made of steel wire, in which the coil springs a thermomechanical solidification and one undergo first and second shot peening.
  • Such manufactured coil springs are found in particular in Automotive use as suspension springs, where at their Resilience the highest demands are made.
  • Coil springs made of steel wire There are essentially two methods of making Coil springs made of steel wire are known.
  • the first Process the so-called “cold wind process” is called Pre-coated steel wire used.
  • the "Hot winding process” is the unrefined steel wire warmed, wrapped warm and then one Subjected to remuneration treatment.
  • the hot winding process is for example in the publication "thermoformed springs" described, which on the occasion of the 52nd International Automobile exhibition IAA, Frankfurt / Main 1987, presented has been.
  • a third manufacturing option is less common, where the raw material is cold wound and the spring only afterwards in a separate one Operation is subjected to remuneration treatment.
  • the hot winding process In the hot winding process, it runs in the form of a rod steel wire used in its remuneration the Steps of heating, hardening and Tempering.
  • the heating is usually done in Continuous furnaces caused by the combustion of gas or oil be heated. In ovens like that, it will Steel wire material relatively slowly Austenitizing temperature brought to it after the To be able to harden winding.
  • the coil springs After hardening and tempering, the coil springs preferably cooled with air, then for the Warming operation to be warmed up again.
  • "Warm up” is used Front of the coil springs, d. H. one over their Yield stress, understood, which is carried out at elevated temperature. By the warming up becomes a favorable residual stress condition generated in the spring wire to increase the static and dynamic resilience of the springs and their relaxation and creep behavior improved.
  • thermomechanical coating of the To make spring wire.
  • This "thermomechanical Compensation” in contrast to the usual performed remuneration in the form of hardening and tempering after heating to austenitizing temperature performed additional step of a plastic Deformation of the spring steel by twisting and / or Rollers.
  • DE 43 30 832 C2 also describes a method known for producing helical compression springs, in which the helical compression springs a first and second Be subjected to shot peening.
  • the object of the invention is therefore based on the above-described prior art a method to create, which enables the production of springs, those with smaller dimensions and lower weight are higher are resilient.
  • This object is achieved by a method of the type mentioned at the outset, which according to the invention is characterized in that the working steps of a first shot peening without pre-tensioning, a subsequent thermal relaxation and a subsequent shot peening are carried out.
  • the first blasting process of the thermomechanical solidification of the coil springs causes the spring wire material near the surface to be plastically deformed as deeply as possible.
  • the subsequent thermal relaxation of the springs brings about favorable changes in properties in the deformed material layers, which can be attributed, among other things, to precipitation processes, aging, polygonization of the structure and formation of an advantageous structure of the dislocations.
  • the final second blasting process with or without Preloading the springs can cause the Development of a high residual pressure in the Boundary layer.
  • this is second Blasting treatment carried out in two stages. In the first stage, preference is given to using a "coarse-grained", applied with high energy A coarse blasting of the springs is carried out. This coarse radiation has a deep effect on the outer layers of the Spring material.
  • the steel wire delivered is first in one electro-inductive, not shown Heater to austenitizing temperature brought. Then the austenitized Steel wire material mechanically in a rolled or Twisting process plastically deformed. Then that happens Wrapping the still warm steel wire into one Coil spring.
  • the thermomechanical coating of the Steel wire is continued by the following the Winding performed hardening. With the conclusion of the The following occasion is the thermomechanical coating of the steel ended.
  • pre-stressed shot peening is mainly in the surface layer near the surface of the spring steel wire directionally high Build up residual compressive stresses.
  • the residual compressive stresses generated in this way are effective as counter voltage in practical use under load resulting tensile stresses.
  • the shot peening under prestress is according to the invention carried out in two stages.
  • the first stage is called Blasting media a relatively coarse grain with a Diameters from 0.7 - 0.9 mm are used. So that can a residual compressive stress profile in the marginal zone of the Achieve spring wire steel, as exemplified in
  • Diagram 2 is shown. It is characteristic the great depth of penetration of the residual compressive stresses but not their highest value as desired, directly in the area of the surface of the spring wire, but only at a certain distance below it to reach.

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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)
  • Springs (AREA)
  • Wire Processing (AREA)
  • Steroid Compounds (AREA)
EP98118691A 1998-10-02 1998-10-02 Procédé de fabrication de ressorts à boudin Expired - Lifetime EP0990708B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP98118691A EP0990708B1 (fr) 1998-10-02 1998-10-02 Procédé de fabrication de ressorts à boudin
AT98118691T ATE235567T1 (de) 1998-10-02 1998-10-02 Verfahren zum herstellen von schraubenfedern
DE59807656T DE59807656D1 (de) 1998-10-02 1998-10-02 Verfahren zum Herstellen von Schraubenfedern
PT98118691T PT990708E (pt) 1998-10-02 1998-10-02 Processo para producao de molas helicoidais
ES98118691T ES2190562T3 (es) 1998-10-02 1998-10-02 Procedimiento para fabricar muelles helicoidales.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98118691A EP0990708B1 (fr) 1998-10-02 1998-10-02 Procédé de fabrication de ressorts à boudin

Publications (2)

Publication Number Publication Date
EP0990708A1 true EP0990708A1 (fr) 2000-04-05
EP0990708B1 EP0990708B1 (fr) 2003-03-26

Family

ID=8232743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98118691A Expired - Lifetime EP0990708B1 (fr) 1998-10-02 1998-10-02 Procédé de fabrication de ressorts à boudin

Country Status (5)

Country Link
EP (1) EP0990708B1 (fr)
AT (1) ATE235567T1 (fr)
DE (1) DE59807656D1 (fr)
ES (1) ES2190562T3 (fr)
PT (1) PT990708E (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104690495A (zh) * 2013-12-05 2015-06-10 上海中国弹簧制造有限公司 高应力悬架弹簧的制造工艺
CN113510444A (zh) * 2021-05-18 2021-10-19 福建永动力弹簧科技有限公司 一种绞龙弹簧生产工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104960996B (zh) * 2015-06-23 2017-10-03 宋锦程 用于钢丝绳的整理装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1109561B (de) * 1959-04-03 1961-06-22 Gen Motors Corp Verfahren zur Erhoehung der Dauerfestigkeit von Metallen
JPH05177544A (ja) * 1991-11-26 1993-07-20 Tougou Seisakusho:Kk コイルばねの製造方法
DE4330832A1 (de) * 1993-09-11 1995-03-16 Hoesch Federn Gmbh Verfahren zur Optimierung der Eigenspannungsverteilung in Federelementen
EP0694621A1 (fr) * 1994-07-28 1996-01-31 Togo Seisakusho Corporation Procédé de fabrication d'un ressort à boudin

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1109561B (de) * 1959-04-03 1961-06-22 Gen Motors Corp Verfahren zur Erhoehung der Dauerfestigkeit von Metallen
JPH05177544A (ja) * 1991-11-26 1993-07-20 Tougou Seisakusho:Kk コイルばねの製造方法
DE4330832A1 (de) * 1993-09-11 1995-03-16 Hoesch Federn Gmbh Verfahren zur Optimierung der Eigenspannungsverteilung in Federelementen
EP0694621A1 (fr) * 1994-07-28 1996-01-31 Togo Seisakusho Corporation Procédé de fabrication d'un ressort à boudin

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 595 (M - 1503) 29 October 1993 (1993-10-29) *
V.G. AZIZBEKYAN ET AL: "Development and introduction of wire for engine valve springs in VAZ", METAL SCIENCE AND HEAT TREATMENT., vol. 38, no. 11, 1996, NEW YORK US, pages 467 - 469, XP002096068 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104690495A (zh) * 2013-12-05 2015-06-10 上海中国弹簧制造有限公司 高应力悬架弹簧的制造工艺
CN113510444A (zh) * 2021-05-18 2021-10-19 福建永动力弹簧科技有限公司 一种绞龙弹簧生产工艺

Also Published As

Publication number Publication date
DE59807656D1 (de) 2003-04-30
ATE235567T1 (de) 2003-04-15
EP0990708B1 (fr) 2003-03-26
PT990708E (pt) 2003-06-30
ES2190562T3 (es) 2003-08-01

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