US3566655A - Method and roll pass arrangement for rolling seamless tubes with external fins - Google Patents

Method and roll pass arrangement for rolling seamless tubes with external fins Download PDF

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Publication number
US3566655A
US3566655A US750239A US3566655DA US3566655A US 3566655 A US3566655 A US 3566655A US 750239 A US750239 A US 750239A US 3566655D A US3566655D A US 3566655DA US 3566655 A US3566655 A US 3566655A
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US
United States
Prior art keywords
roll
fins
section
rolling
final
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
US750239A
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English (en)
Inventor
Karl Ernst Scholten
Kurt Sonnabend
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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
Priority claimed from DE1967M0075115 external-priority patent/DE1279600B/de
Application filed by Mannesmann AG filed Critical Mannesmann AG
Application granted granted Critical
Publication of US3566655A publication Critical patent/US3566655A/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
    • B21B21/005—Pilgrim-step tube-rolling, i.e. pilger mills with reciprocating stand, e.g. driving the stand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes or tubes with decorated walls
    • B21C37/202—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes or tubes with decorated walls with guides parallel to the tube axis

Definitions

  • a seamless finned tube is produced from a bloom by cold pilger rolling in two successive roll groove sections; in the first section the tube is rolled down to final wall thickness, and in the second the fins are rolled to final size.
  • the lengths of the unrolled two section grooves have a ratio of 3:1.
  • the invention relates to methods and roll pass arrangements for the rolling of seamless steel tubes with two opposite external longitudinal fins; more particularly, the invention relates to a method and arrangement of the foregoing type in accordance with which the tubular bloom is pilger cold rolled on a roll mandrel that is either partly cylindrical and partly conical, or conical throughout its length.
  • the invention provides for rolling the tubular bloom on a roll mandrel that is either partly cylindrical and partly conical, or throughout its length conical, and permitting the material to spread into roll gap spaces.
  • a roll mandrel that is either partly cylindrical and partly conical, or throughout its length conical, and permitting the material to spread into roll gap spaces.
  • the bloom is rolled down to its final tubular thickness, and at the same time the fins which are formed in the aforesaid spaces are pre-rolled.
  • the fins are rolled to their final dimension, while the tubular bloom retains its wall thickness unchanged.
  • the ratio of the developed lengths of the two roll groove sections is important.
  • the first section requires a greater length than the second, as it is required to produce a greater amount of deforming labor.
  • the aforesaid ratio of lengths of the two developed sections is about 3:1.
  • the height of the aforesaid spaces for the external fins decreases within the roll gap down to the final thickness of the external fins.
  • the width of these spaces exceeds the final width of the external fins for a substantial amount, at least for five millimeters each, in order to permit the free spreading of the external fins.
  • FIG. 1 is a fragmentary sectional view of a pilger roll groove and the tubular bloom and conical roll mandrel, at the start of the first roll groove section;
  • FIG. 2 is a fragmentary sectional view, similar to FIG. 1, showing the end of the first roll groove section that coincides with the beginning of the second roll groove section;
  • FIG. 3 is a fragmentary sectional view, similar to FIGS. 1 and 2, but showing the end of the second roll groove section;
  • the mandrel for the method in accordance with the three stages of FIGS. l-3 utilizes a roll mandrel that for a part of its length (FIGS. 1 and 2) is conical and for the remainder of its length (FIG. 3) is cylindrical;
  • FIGS. 4-6 are fragmentary sectional views, similar to FIGS. 1-3, respectively, and show three rolling stages similar to those of FIGS. 1-3, but the stages of FIGS. 4-6 are for a method that utilizes a roll mandrel which throughout its entire length is conical.
  • FIG. 1 there is shown the tubular bloom in a roll pass with a tapered cone during the first roll groove section, and there is illustrated the beginning of the forma tion of the lateral fins.
  • FIG. 2 there is shown the final position of the aforesaid first roll groove section which at the same time forms the beginning of the second roll groove section.
  • the lateral fins have been preformed which is similar to but does not have the end dimensions, of the final fin form.
  • the tubular thickness has in FIG. 2 received its final size.
  • the rolling will be performed over a cylindrical roll mandrel portion and the wall thickness of the tube will remain unchanged.
  • the fins will be rolled down to their final size, shown in FIG. 3.
  • FIGS. 4-6 are similar to FIGS. 1-3, but the roll mandrel throughout its length is conical, so that in FIGS. 4-6 the internal diameters of the tube is shown of reduced sizes through the progressing stages.
  • a tubular steel bloom into a seamless tube having two opposite external fins the pilger rolls having succeeding first and second roll groove sections, the first section including lateral open spaces outside the roll grooves for receiving a free spread of bloom material to be rolled subsequently into fins in the succeeding second section, and the second section including roll gap spaces for the finish rolling of said fins
  • the steps comprising cold pilger rolling the tubular bloom in the first pilger roll groove section down to the final tubular wall thickness alfording the-said free spread into said lateral spaces, and subsequently finish rolling in the second roll groove section the fins including thinning and radially widening the fins without changing the tubular wall thickness.
  • a pilger roll pass construction for use in rolling over a mandrel tapered at least throughout a portion of its length a tubular steel bloom into a seamless tube having two opposite external fins, comprising in combination, two rolls defining succeeding first and second r oll groove sections, the first section including lateral open spaces outside the roll grooves for receiving a free spread of bloom material to be rolled subsequently into fins in the succeeding second section, and the second section defining roll gap spaces for the finish rolling of said fins, the ratio of the developed lengths of said first roll groove section as compared to the second being 3:1.
  • said roll gap spaces having a terminal height substantially equal to the final thickness of the fin and having a terminal width substantially larger than the final width of the fin.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US750239A 1967-08-03 1968-08-05 Method and roll pass arrangement for rolling seamless tubes with external fins Expired - Lifetime US3566655A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEM0075032 1967-08-03
DE1967M0075115 DE1279600B (de) 1967-08-11 1967-08-11 Verfahren und Walzenkalibrierung zum Walzen von nahtlosen Rohren mit Aussenlaengsrippen

Publications (1)

Publication Number Publication Date
US3566655A true US3566655A (en) 1971-03-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US750239A Expired - Lifetime US3566655A (en) 1967-08-03 1968-08-05 Method and roll pass arrangement for rolling seamless tubes with external fins

Country Status (4)

Country Link
US (1) US3566655A (enrdf_load_stackoverflow)
JP (1) JPS4842542B1 (enrdf_load_stackoverflow)
FR (1) FR1576793A (enrdf_load_stackoverflow)
GB (1) GB1193390A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688540A (en) * 1969-07-29 1972-09-05 Superior Tube Co Tube rolling mill employing a tapered mandrel and a cluster of rolls that each have specially designed tube contacting grooves
US4095447A (en) * 1976-09-15 1978-06-20 Alexandr Andreevich Shevchenko Method and rolling mill for continuous tube rolling
US20080226935A1 (en) * 2007-03-14 2008-09-18 Kabushiki Kaisha Kunitec Tubular product and manufacturing method and manufacturing device thereof
CN114082803A (zh) * 2021-11-22 2022-02-25 韩维新 一种带肋薄壁包壳管的生产工艺及冷拔模具

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688540A (en) * 1969-07-29 1972-09-05 Superior Tube Co Tube rolling mill employing a tapered mandrel and a cluster of rolls that each have specially designed tube contacting grooves
US4095447A (en) * 1976-09-15 1978-06-20 Alexandr Andreevich Shevchenko Method and rolling mill for continuous tube rolling
US20080226935A1 (en) * 2007-03-14 2008-09-18 Kabushiki Kaisha Kunitec Tubular product and manufacturing method and manufacturing device thereof
US8020422B2 (en) * 2007-03-14 2011-09-20 Kabushiki Kaisha Kunitec Tubular product and manufacturing method and manufacturing device thereof
CN114082803A (zh) * 2021-11-22 2022-02-25 韩维新 一种带肋薄壁包壳管的生产工艺及冷拔模具

Also Published As

Publication number Publication date
FR1576793A (enrdf_load_stackoverflow) 1969-08-01
JPS4842542B1 (enrdf_load_stackoverflow) 1973-12-13
GB1193390A (en) 1970-05-28

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