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Method for calibration of assel rollers

  • US 5,649,440 A
  • Filed: 11/17/1995
  • Issued: 07/22/1997
  • Est. Priority Date: 11/17/1994
  • Status: Expired due to Fees
First 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.

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