Określono wpływ zmiennej geometrii narzędzi ciągarskich (alfa, beta, alfa-beta), sposobu przygotowania powierzchni narzędzi oraz prędkości ciągnienia na stan i własności ciągnionych na korku swobodnym rur ze stali nierdzewnej chromowo-niklowej, ze szczególnym uwzględnieniem własności warstwy wierzchniej rur. Zamieszczono obserwacje topografii oraz makro- i mikrostruktury powierzchni, a także przedstawiono wyniki rozkładu mikrotwardości na przekroju poprzecznym rur przed i po ciągnieniu.
EN
This paper is the follow-up of investigations of floating-plug drawing process performed with tubes made of stainless steel. Paper [2] presents results of investigations of roughness examination of the inner and outer surface of the tubes and tools before and after drawing. X6CrNiTi18-10 stainless steel tubes were tested. Drawing tools used were as follows: sets of drawing dies with angles alfa = 12 degrees and 16 degrees and floating plugs with angles beta = 9 degrees, 10 degrees, 11 degree 30', 13 degrees and 14 degrees. Drawing dies and floating plugs were made of sintered carbides of G10 class. Working areas of drawing dies were polished. Drawing speed was changed in the range between 1/10 m/min. RATAK PZ 150 HK made by Fush Oil Corp. was used as the lubricant. Tubes were drawn according to pattern: 19 x 1.2 --> 6 x 1.06. The surface of the tubes were prepared by grinding so that supply more lubricant into deformation zone. An effect of variable tools geometry (alfa, beta, alfa - beta), tools surface preparation method and of a drawing rate on the state and properties of stainless steel tubes drawn on a floating, particularly on the surface layer of a tube, is discussed. Experimental results of macro- and micro structural observations and microgeometry measurements of external and internal tube surface of the tubes before and after drawing are presented.
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