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Replacement of lead baths with environment friendly alternative heat treatment processes in steel wire production
Örebro universitet, Institutionen för teknik.
2005 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Örebro: Örebro universitetsbibliotek , 2005. , s. 32
Serie
Örebro Studies in Technology, ISSN 1650-8580 ; 17
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
Maskinteknik
Identifikatorer
URN: urn:nbn:se:oru:diva-3376OAI: oai:DiVA.org:oru-3376DiVA, id: diva2:137673
Presentation
(Engelska)
Tillgänglig från: 2007-07-17 Skapad: 2007-07-17 Senast uppdaterad: 2017-10-18Bibliografiskt granskad
Delarbeten
1. Replacement of lead baths for the tempering of spring wire
Öppna denna publikation i ny flik eller fönster >>Replacement of lead baths for the tempering of spring wire
2003 (Engelska)Ingår i: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 32, nr 5, s. 241-246Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Molten lead is used for tempering of valve-spring wire. Lead has drawbacks due to slow temperature changes. In 1991 the Swedish Parliament passed a Government Bill, in which proposals were made to phase out the use of lead in the long term, primarily through voluntary measures. Tempering of SIS 2090 (SAE 9254, DIN 55SiCr7) wire with different dimensions using induction heating was tested in a pilot process line. An induction coil for six wires and two coils with different lengths designed for single wires were tested. The results showed that an induction coil for six wires gave excessive temperature and property variations between the wires. The shorter of the single wire coils gave fluctuations in temperature and properties using a 3.00-mm wire. No such fluctuations were observed with the longer coil. One of the experiments showed that the process might need time to reach stable conditions. The results so far indicate that it is possible to produce valve-spring wire with induction tempering. The process needs more control and monitoring compared to tempering in molten lead. © Blackwell Munksgaard, 2003.

Nyckelord
Automotive engineering, Lead, Wire, Monitoring
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
Maskinteknik
Identifikatorer
urn:nbn:se:oru:diva-4615 (URN)10.1034/j.1600-0692.2003.00648.x (DOI)
Tillgänglig från: 2007-07-12 Skapad: 2007-07-12 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
2. Alternatives to lead bath for patenting of high carbon steel wire
Öppna denna publikation i ny flik eller fönster >>Alternatives to lead bath for patenting of high carbon steel wire
2004 (Engelska)Ingår i: Wire Journal International, ISSN 0277-4275, Vol. 37, nr 5, s. 82-86Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The alternatives to lead bath for patenting of high carbon steel wire are discussed. It is found that it is possible to achieve properties of high-speed gas patented music wire without using a soaking furnace. Laboratory experiments with patenting in a fluidized bed, showed that the process could give the required mechanical properties for the valve spring wire. It is also found that small alterations in process parameters in the industrial trials has a large impact on the mechanical properties and microstructures.

Nyckelord
Carbon steel, Furnaces, Austenite, Mufflers, Wire drawing, Molten materials, Valves (mechanical), Quenching, Process control, High temperature effects
Forskningsämne
Maskinteknik
Identifikatorer
urn:nbn:se:oru:diva-4582 (URN)
Tillgänglig från: 2007-07-12 Skapad: 2007-07-12 Senast uppdaterad: 2017-10-18Bibliografiskt granskad
3. Material properties of induction tempered high tensile valve spring wire
Öppna denna publikation i ny flik eller fönster >>Material properties of induction tempered high tensile valve spring wire
2006 (Engelska)Ingår i: Steel Research International, ISSN 1611-3683, Vol. 77, nr 11, s. 836-843Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Most of today's hardened valve spring wires are tempered in a lead bath. The lead bath provides a stable and accurate degree of tempering of the wire, but it has environmental disadvantages and limitations in flexibility. This paper describes how induction heating can replace lead bath and how this may affect the material properties. The study includes FEM-simulations, calculation of the tempering parameter and experiments with induction tempering of three different SiCr valve spring steels carried out under pilot production. The mechanical properties of the test samples were measured. Fatigue testing of one of the steels was performed on finished springs. The results were evaluated by comparing induction-tempered wire with the conventional lead tempered reference wire. The induction tempered wire fulfilled the product requirements and corresponded in performance with the lead tempered wire.

Ort, förlag, år, upplaga, sidor
Düsseldorf: Verlag Stahleisen, 2006
Nyckelord
Wire, Valves (mechanical), Tempering, Lead, Thermoanalysis, Steel, Finite element method, Computer simulation, Induction tempering, Spring steel, Super clean steel, High strength steel, Silicon chromium steel
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
maskinteknik
Identifikatorer
urn:nbn:se:oru:diva-4387 (URN)
Tillgänglig från: 2007-07-12 Skapad: 2007-07-12 Senast uppdaterad: 2017-10-18Bibliografiskt granskad

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