US1876691A - Pilger rolling process and roll for performing same - Google Patents

Pilger rolling process and roll for performing same Download PDF

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Publication number
US1876691A
US1876691A US438600A US43860030A US1876691A US 1876691 A US1876691 A US 1876691A US 438600 A US438600 A US 438600A US 43860030 A US43860030 A US 43860030A US 1876691 A US1876691 A US 1876691A
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US
United States
Prior art keywords
stretching
roll
pass
rolling process
tube
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
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US438600A
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English (en)
Inventor
Klein Ludwig
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Individual
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Individual
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Publication date
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Publication of US1876691A publication Critical patent/US1876691A/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

  • the backing up and accumulation of the material causes so high a pressure between the rolls and the mandrel, that the tube metal is distorted and the rolls and the mandrel are subjected to excessive wear.
  • the distortion and overstressing of the metal may become 'so heavy that cracks may formin the tube.
  • This improvement is effected 'by subdividing the rolling process into several'alternating stretching and surfacing stages. In this manner each stretching pass is supplied only with the amount of material which it is able to forge without excessive pressure and stress. 7 o
  • the stretehin passes are so arranged that in each succeeding pass the wall thiclmess is reduced to a greater extent, than in the next preceding stretching pass.
  • Fig. 2 is an axial section showing part of the tube.
  • a and 0 are eccentric passes for stretching the tube
  • b and d are centric surfacing passes.
  • the eccentricity of the first stretching pass a is greater than that of the second stretching pass 0. If v a third stretching pass is provided, its eccentricity should be smaller than that of the pass a, and so on.
  • the wall thickness 8 imparted to the tube 3 in the first stretching pass a remains constant in the first surfacing pass 6 and is then reduced in the second stretching pass a to the final thickness 8' which is preserved during the second surfacing stage (1.
  • a pilger tube rolling process in which each bite of the rolls results in a plurality of alternating stretching and surfacing operations.
  • a pilger tube rolling process subdivided into a plurality of alternating stretching and surfacing stages, in which the tube metal is stretched less in the second stretching stage than in the first stretching stage.
  • a pilger roll comprising two eccentric passes and a centric surfacing pass between said straight passes.
  • a pilger roll comprising two eccentric stretching passes and a centric surfacing pass between said eccentric passes, the eccentricity of the first stretching pass being greater than that of the second stretchin pass.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US438600A 1929-04-02 1930-03-24 Pilger rolling process and roll for performing same Expired - Lifetime US1876691A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE340454X 1929-04-02

Publications (1)

Publication Number Publication Date
US1876691A true US1876691A (en) 1932-09-13

Family

ID=6227197

Family Applications (1)

Application Number Title Priority Date Filing Date
US438600A Expired - Lifetime US1876691A (en) 1929-04-02 1930-03-24 Pilger rolling process and roll for performing same

Country Status (4)

Country Link
US (1) US1876691A (xx)
BE (1) BE368766A (xx)
FR (1) FR692219A (xx)
GB (1) GB340454A (xx)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3508924A1 (de) * 1985-03-13 1986-09-18 Josef Fröhling GmbH, Walzwerksmaschinenbau, 5960 Olpe Verfahren und vorrichtung zum reduzieren des querschnitts von stabfoermigem material bzw. warmen stranggussmaterial

Also Published As

Publication number Publication date
BE368766A (xx)
FR692219A (fr) 1930-10-31
GB340454A (en) 1931-01-01

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