US1917448A - Pilgering rolling mill - Google Patents

Pilgering rolling mill Download PDF

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Publication number
US1917448A
US1917448A US516161A US51616131A US1917448A US 1917448 A US1917448 A US 1917448A US 516161 A US516161 A US 516161A US 51616131 A US51616131 A US 51616131A US 1917448 A US1917448 A US 1917448A
Authority
US
United States
Prior art keywords
pass
roll
pilgering
section
cross
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US516161A
Other languages
English (en)
Inventor
Kocks Fritz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vereinigte Stahlwerke AG
Original Assignee
Vereinigte Stahlwerke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vereinigte Stahlwerke AG filed Critical Vereinigte Stahlwerke AG
Application granted granted Critical
Publication of US1917448A publication Critical patent/US1917448A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/02—Rollers therefor

Definitions

  • Fig'. 1 is a fragmentary detail section taken radially through one of the rolls shown n Fi 2.
  • %'ig. 2 is a longitudinal section through the bottom of a pilgering roll. I 3
  • Fig. 3 is a fragmentary cross section through the pass parallel to the plane 1n which the axes of the rolls he during the 0 working operation.
  • the distance between the roll and the circular mandrel is at the bottom of the pass considerably less than atthe sides of the pass.
  • the effect is that the roll, the material being rolled, and the mandrel are locally overstrained which makes it impossible to roll walls below the normal thickness.
  • passes which, in radial section through the roll, are elliptical or of any flat-oval shape, such that the major axis of the ellipse lies parallel with the axis of the roll. and that therefore the pass is not so deep as it is wide.
  • Such formation ofthe pass has, as will be understood, defects inherent in passes of circular radial cross-section hereinbefore described, but to an in creased degree, because the distance from roll a to mandrel in the cross-sections in which the main rolling operation takes place is considthe sides.
  • Such passes thus stretch the material being 'rolled in a still more irregular manner than passes which are circular in radial section and stress the material being rolled still more.
  • the object of the invention is so to form the pass that the pressure of the roll is distributed over the whole width of the pass, points of rolling pressure at the bottom of the pass are avoided, and the material being rolled is stretched as uniformly as possible over its Whole periphery.
  • the pass of the pilgering mouth in radial section through'the roll according to the invention is given such an elliptical or other oval shape that the major axis of the ellipse is perpendicular to the axis of the roll, the minor axis being parallel to it. Then the desired circle can be obtained due to the fact that the length A 2 (Fig. 2) is shorter than the depth of the passin the radial section 0 2' to which the point 2' is belonging.
  • the ellipticity of the ellipse decreases then gradually from the beginning of the pilgering mouth to the beginning of the polishing surface and the ellipse changes to a circle at the point of transition into the polishing pass.
  • W denotes the roll
  • H the hollow body
  • D the mandrel and the curve I the mouth
  • the curve III the outlet from th pass.
  • a roll pass for pilgering rolling mills characterized in that the pass at the mouth of the pilger is given such an elliptical shape in radial section through the roll that the pass of the roll is circular in the cross-section which is perpendicular to the axis of the workat the point Where the principal rolling operation is carried out by the pass, the ellipticity of the ellipse, the major axis of which is perpendicular to the axis of the roll, decreasing continuously from the beginning of the pilgering mouth to th beginning of the polishing surface and the ellipse changing to circular shape on the transition into the polishing pass.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Rolling (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US516161A 1930-05-27 1931-02-16 Pilgering rolling mill Expired - Lifetime US1917448A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE540684T 1930-05-27

Publications (1)

Publication Number Publication Date
US1917448A true US1917448A (en) 1933-07-11

Family

ID=34223030

Family Applications (1)

Application Number Title Priority Date Filing Date
US516161A Expired - Lifetime US1917448A (en) 1930-05-27 1931-02-16 Pilgering rolling mill

Country Status (5)

Country Link
US (1) US1917448A (en(2012))
BE (1) BE376733A (en(2012))
DE (1) DE540684C (en(2012))
FR (1) FR709616A (en(2012))
GB (1) GB371387A (en(2012))

Also Published As

Publication number Publication date
GB371387A (en) 1932-04-18
DE540684C (de) 1932-01-08
BE376733A (en(2012))
FR709616A (fr) 1931-08-11

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