Method for calibration of assel rollers
First Claim
1. A method of calibrating a generally conical forming roller of an Assel-type mill for rolling tubes about a mandrel rotatable about a mandrel axis, the mill having at least three said forming rollers circumferentially spaced about the mandrel, each said forming roller including a conical entrance, a working shoulder, a smoothing part and a rounding part, and being operatively rotatable about a forming roller axis oriented relative to the mandrel axis by a first angle α
- , each said forming roller being further oriented relative to the mandrel axis by a second angle γ
defined between the mandrel axis and said forming roller axis, comprising the steps of;
(a) adjusting the second angle γ
of each forming roller to be approximately in the range 7°
to 17°
, said adjustment depending on the rolling tube diameter and the length of the smoothing part of each roller, said second angle γ
decreasing with increasing tube diameters;
(b) adjusting the first angle α
of each forming roller to be approximately in the range 7°
to 30°
; and
(c) providing an orientational relationship between the rounding part and the smoothing part of each forming roller defined by a third angle β
in the range of approximately 4°
to 15° and
defined between the mantle extension of the rounding part of the forming roller and a mantle extension defined along a circumferential periphery of the forming roller smoothing part.
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Accused Products
Abstract
A method of calibrating and orienting forming rollers of an Assel-type rolling mill, and more particularly, of calibrating an Assel mill for rolling thin-walled tubes of pre-pierced hollow bodies about a mandrel, using at least three generally conical rollers that are circumferentially spaced about the mandrel. The orientation of each forming roller is adjusted so as to position the roller inclination relative to the mandrel axis of roll by an expansion angle α of approximately 7° to 30°. Each forming roller is also adjustably oriented so that its smoothing part relative to the mandrel axis of roll defines a transport angle γ of approximately 7° to 17°. In further accordance with this invention, each forming roller is configured so as to have an opening angle β of approximately 4° to 15°.
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Citations
1 Claim
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1. A method of calibrating a generally conical forming roller of an Assel-type mill for rolling tubes about a mandrel rotatable about a mandrel axis, the mill having at least three said forming rollers circumferentially spaced about the mandrel, each said forming roller including a conical entrance, a working shoulder, a smoothing part and a rounding part, and being operatively rotatable about a forming roller axis oriented relative to the mandrel axis by a first angle α
- , each said forming roller being further oriented relative to the mandrel axis by a second angle γ
defined between the mandrel axis and said forming roller axis, comprising the steps of;(a) adjusting the second angle γ
of each forming roller to be approximately in the range 7°
to 17°
, said adjustment depending on the rolling tube diameter and the length of the smoothing part of each roller, said second angle γ
decreasing with increasing tube diameters;(b) adjusting the first angle α
of each forming roller to be approximately in the range 7°
to 30°
; and(c) providing an orientational relationship between the rounding part and the smoothing part of each forming roller defined by a third angle β
in the range of approximately 4°
to 15° and
defined between the mantle extension of the rounding part of the forming roller and a mantle extension defined along a circumferential periphery of the forming roller smoothing part.
- , each said forming roller being further oriented relative to the mandrel axis by a second angle γ
Specification
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- Resources
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Current AssigneeMannesmann AG (Vodafone Group PLC)
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Original AssigneeMannesmann AG (Vodafone Group PLC)
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InventorsVoswinckel, Gunther, Arnautu, Gheorghe, Wengenroth, Karl-Helmut, Hausler, Karl Heinz, Pietsch, Jurgen
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Primary Examiner(s)Larson, Lowell A.
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Application NumberUS08/560,107Time in Patent Office613 DaysField of Search72/96, 72/97, 72/98, 72/100US Class Current72/96CPC Class CodesB21B 19/06 Rolling hollow basic materi...
