EP0990708B1 - Procédé de fabrication de ressorts à boudin - Google Patents

Procédé de fabrication de ressorts à boudin Download PDF

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Publication number
EP0990708B1
EP0990708B1 EP98118691A EP98118691A EP0990708B1 EP 0990708 B1 EP0990708 B1 EP 0990708B1 EP 98118691 A EP98118691 A EP 98118691A EP 98118691 A EP98118691 A EP 98118691A EP 0990708 B1 EP0990708 B1 EP 0990708B1
Authority
EP
European Patent Office
Prior art keywords
shot
coil springs
peening
springs
procedure
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
EP98118691A
Other languages
German (de)
English (en)
Other versions
EP0990708A1 (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
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 filed Critical ThyssenKrupp Automotive AG
Priority to DE59807656T priority Critical patent/DE59807656D1/de
Priority to PT98118691T priority patent/PT990708E/pt
Priority to ES98118691T priority patent/ES2190562T3/es
Priority to AT98118691T priority patent/ATE235567T1/de
Priority to EP98118691A priority patent/EP0990708B1/fr
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, one first shot peening, followed by thermal relaxation and then a subsequent shot peening. so manufactured coil springs are found in particular in Automotive use as suspension springs, where at their Resilience must meet the highest demands.
  • 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 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 Cranking.
  • 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 up” operation to be warmed up again.
  • "Warm up” is used Front of the coil springs, d. H. one over their Yield stress beyond, understood, which is carried out at elevated temperature. By 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 In contrast to the usual, remuneration includes 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, starting from the above explained prior art to provide a method that the production of Springs allows for higher dimensions with smaller dimensions and lower weight are resilient.
  • thermomechanical solidification of the Coil springs make the spring wire material close to the surface as deep as possibly plastically deformed.
  • the subsequent thermal relaxation of the springs causes favorable changes in properties in the deformed material layers et al on excretion processes, aging, polygonization of the structure and Formation of an advantageous structure of the dislocations.
  • the final second blasting process which involves the springs being preloaded is carried out, causes a high residual compressive stress to build up in the Boundary layer.
  • this second blasting treatment takes place in two Steps.
  • a "coarse-grained", high-energy abrasive means a coarse blasting of Springs performed. This coarse radiation has a deep effect in the outer layers of the Spring material.
  • the so-called. "Fine blasting” is carried out, causing an increase directly on the wire surface of the residual compressive stresses and smoothing them.
  • Preloading the coil springs in the first step is a coarse-grained Blasting media used and in the second step a finer grained.
  • JP-A-05177544 it is known to strengthen an outer layer Steel wire coil springs by the sequence of operations first Shot peening, thermal relaxation and second shot peening. About that it is also known from DE-A-4330832 to use the so-called. Use stress beams after the spring has been thermally relaxed has been. With this tension blasting, the spring is in a preloaded state peened.
  • the delivered steel wire 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 Wind 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 reason is the thermomechanical coating of the steel ended.
  • pre-stressed shot peening is mainly in the surface layer near the surface the directional high of the spring steel wire Build up residual compressive stresses. Do they stand Springs during blasting under a preload which acts in the same direction as the later operating load, so in that direction on the Steel wire surface particularly high internal compressive stresses build up in which the operating load is the highest Will cause tensile stress. As a rule, this is at an angle of 45 ° to the longitudinal axis of the spring wire the case.
  • the residual compressive stresses generated in this way have an effect 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.

Landscapes

  • 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)

Claims (3)

  1. Procédé pour la fabrication de ressorts à boudin en fil d'acier, dans le cadre duquel lesdits ressorts à boudin sont soumis à un durcissement superficiel, à un premier grenaillage, suivi d'une relaxation thermique, et à un deuxième grenaillage qui suit celle-ci, caractérisé en ce que le premier grenaillage est effectué sans précontrainte, et le deuxième grenaillage sous précontrainte du ressort à boudin, dans lequel le deuxième grenaillage se fait en deux étapes, et l'agent de grenaillage utilisé est un produit uniforme, à gros grains, qui, au cours de la première étape, est projeté à une vitesse plus élevée qu'au cours de la deuxième étape.
  2. Procédé pour la fabrication de ressorts à boudin en fil d'acier dans le cadre duquel lesdits ressorts à boudin sont soumis à un durcissement thermomécanique superficiel, à un premier grenaillage, suivi d'une relaxation thermique, et à un deuxième grenaillage qui suit celle-ci, caractérisé en ce que le premier grenaillage est effectué sans précontrainte, et le deuxième grenaillage sous précontrainte du ressort à boudin, dans lequel le deuxième grenaillage se fait en deux étapes, et l'agent de grenaillage utilisé au cours de la première étape du deuxième grenaillage est un produit à gros grains, tandis que celui utilisé lors de la deuxième étape est un produit à grains plus fins.
  3. Procédé selon la revendication 2, caractérisé en ce que, lors du deuxième grenaillage, l'agent de grenaillage est projeté, au cours de la première étape, à une vitesse supérieure à celle de la deuxième étape.
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
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.
AT98118691T ATE235567T1 (de) 1998-10-02 1998-10-02 Verfahren zum herstellen von schraubenfedern
EP98118691A EP0990708B1 (fr) 1998-10-02 1998-10-02 Procédé de fabrication de ressorts à boudin

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 EP0990708A1 (fr) 2000-04-05
EP0990708B1 true 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)

Families Citing this family (3)

* 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
CN104960996B (zh) * 2015-06-23 2017-10-03 宋锦程 用于钢丝绳的整理装置
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

Family Cites Families (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
JP2994508B2 (ja) * 1991-11-26 1999-12-27 株式会社東郷製作所 コイルばねの製造方法
DE4330832C2 (de) * 1993-09-11 1996-04-04 Hoesch Federn Gmbh Verfahren zur Optimierung der Eigenspannungsverteilung im Stabquerschnitt von Schraubendruckfedern
JP3173756B2 (ja) * 1994-07-28 2001-06-04 株式会社東郷製作所 コイルばねの製造方法

Also Published As

Publication number Publication date
ATE235567T1 (de) 2003-04-15
DE59807656D1 (de) 2003-04-30
PT990708E (pt) 2003-06-30
ES2190562T3 (es) 2003-08-01
EP0990708A1 (fr) 2000-04-05

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