Effect of flaw removal on billets and wires in rolling and drawing

• Autorzy: Yoshida K. , Shinohara T.

Warianty tytułu

PL

Wpływ usuwania wad w kęsach walcowanych i drutach ciągnionych

• Konferencja: Międzynarodowa Konferencja Ciągarska ,,Nowoczesne technologie oraz modelowanie procesów ciągnienia i wytwarzania wyrobów metalowych", (II; 2007; Zakopane; Polska)
• Języki publikacji: EN

Abstrakty

EN

High-quality wires, which are used for components such as valve springs of automobiles, are fabricated by rolling and drawing. Even a minute flaw on the surface of the wire leads to a significant decrease in fatigue strength. Under such circumstances, high-quality wires are fabricated, at many wire manufacturing factories, by rolling and drawing after removing surface flaws on the raw material. However, the flaw removal process is carried out relying on the experience of onsite workers; many of the mechanisms underlying flaw removal have not been clarified. In this study, billet and wire that have traces formed during flaw removal were subjected to rolling and drawing to investigate the behavior of deformation and the recovery of the flaw-removal traces. When flaw-removal traces exist on a billet surface that comes into contact with the roll used in rolling, the traces are removed without difficulty. However, when the flaw-removal traces exist on a surface that does not come into contact with the roll, the traces tend to become wrinkles due to compression from the upper and lower directions. Two cases of drawing, i.e., when only the flaw part is removed and when the flaw part and the surrounding area are removed, were examined. The results of three-dimensional finite-element analysis (FEA) indicate that the removal of the flaw and the surrounding area results in a better outcome in terms of uniform recovery behaviour than the removal of the flaw alone.

PL

Druty wysokogatunkowe, używane do produkcji sprężyn zaworów w przemyśle motoryzacyjnym są otrzymywane na drodze walcowania i ciągnienia. Nawet minimalna wada powierzchni tego rodzaju drutów prowadzi do istotnego spadku wartości wytrzymałości na rozciąganie. W pracy przedstawiono wyniki przestrzennej analizy numerycznej z wykorzystaniem metody elementów skończonych, pozwalającej na ocenę, która z metod usuwania wad w drutach wysokogatunkowych jest właściwa.

Słowa kluczowe

EN

rolling, drawing; surface flaw; high-quality wire

PL

walcowanie; ciągnienie; skaza powierzchniowa; drut wysokogatunkowy

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Hutnik, Wiadomości Hutnicze
• Rocznik: 2007
• Tom: Vol. 74, nr 1-2
• Strony: 111--114
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Yoshida K.

autor

Shinohara T.

• Department of Precision Engineering, School of Engineering Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan,

Bibliografia

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• 2. Kawakami H., Kawaguchi Y., Kanesada Y., Oshiro T.: Automatic surface-flaw detection and removal technique for wire rods, Kobe Steel Eng. Rep, 41-4, 1991, s. 71-74.
• 3. Matsui T., Ogata T., Fujita M., Asakawa M.: Relationships between surface flaws and caliber design on bar and rod rolling, Sumitomo Met., 26-3, 1974, s. 324-337.
• 4. Shiga N.: Trend of wire manufacturer, Special Steel, 48- 2, 1999, s. 16-18.
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• 7. Shinohara T., Yoshida K.: Growth and disappearance of transversal cracks on stainless steel wire in wire drawing, Tetsuto- Hagane, 90-12, 2004, s. 1010-1015.
• 8. Shinohara T., Yoshida K.: Deformation analysis of surface crack in rolling and wire drawing, JSME Int. Journal, Ser A, 48-4, 2005, s. 335-340.
• 9. Shinohara T., Yoshida K.: Deformation analysis of surface flaws in stainless steel wire drawing, Mater Process Technology, 162/163, 2005, s. 579-584.
• 10. Hebinuma M.: Establishment of scalping technique for ferrite stainless steel wire, Aichi Steel Tech. Rep., 10-1, 1990, s. 3-9.
• 11. Rosa J. A. C., Barcelos E. J. B. V., Costa M. L., Hayakawa M. O., Ce’ J. C.: Valve spring wire with extra-low oxygen and with shaved surface-a real need, Wire J Int., 25-4, 1992, s. 59-64.
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