US1870209A - Method of reducing and elongating tubular blanks - Google Patents

Method of reducing and elongating tubular blanks Download PDF

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Publication number
US1870209A
US1870209A US527652A US52765231A US1870209A US 1870209 A US1870209 A US 1870209A US 527652 A US527652 A US 527652A US 52765231 A US52765231 A US 52765231A US 1870209 A US1870209 A US 1870209A
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United States
Prior art keywords
blank
rolls
mandrel
reducing
cross
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Expired - Lifetime
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US527652A
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English (en)
Inventor
Samuel E Diescher
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Individual
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Individual
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Filing date
Publication date
Priority to NL37171D priority Critical patent/NL37171C/xx
Priority to BE387492D priority patent/BE387492A/xx
Application filed by Individual filed Critical Individual
Priority to US527652A priority patent/US1870209A/en
Priority to GB7838/32A priority patent/GB380000A/en
Priority to DED63180D priority patent/DE649754C/de
Priority to FR734256D priority patent/FR734256A/fr
Application granted granted Critical
Publication of US1870209A publication Critical patent/US1870209A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers

Definitions

  • the invention relates to the manufacture of seamless tubing, the object being to improve the method of manufacture thereof disclosed in my Patent No. 1,280,683.
  • a tubular blank of metal is elongated and reduced in wall thickness by subjecting it while on a mandrel to the reducing action of a pair of cross or equivalent helically-acting rolls, the peripheral flow of the metal as it is'reduced being controlled, being diverted longitudinally of the blank, by the faces of grooved or equivalent driven rolls acting upon the blank intermediate thepoints of contact of the reducing rolls with the blank. Lateral bulging of the blank being reduced is prevented by'the surfaces of the grooved rolls which are spaced from the mandrel a distance equivalent to the wall thickness of the reduced-tube.
  • the object of this invention is to improve the method of manufacturing seamless tubes disclosed in my said patent to the end that the formed tubing will have an internal diameter sufliciently larger than the diameter of the mandrel that the tubing will not shrink into binding contact withthe mandrel accompanied with the above-explained prejudicial consequences, and that much greater wallreductions and tube elongations'may be efiected; a'ndto the further ends that a single size of mandrel may be used in the manufacture of tubing having different internal diameters, and that shorter mandrels may be used.
  • a tubular blank is reduced in wall thickness and elongated, in a manner generally similar to that disclosed in my said'patent, by subjecting theblank while on a mandrel to the reducing action of a pair of cross or equivalent helically-acting rolls, but in my improved method the tubular blank is permit-2 ted to take a cross-sectional form in which .it bulges laterally from those portions of the surface of the mandrel that lie between the oppositely disposed points of engagement of thecross rolls with the blank.
  • the reducing pressure of the cross rolls on the blank causes the metal 'to flow from the pressure points, and, considered as to its peri heral and longitudinal components,, such ow is predominantly peripheral, as is well known.
  • ripheral flow of the metal is controlled (being diverted longitudinally of the blank, that is,-converted into a flow having a larger longitudinal component) by a pair of driven grooved or equivalent rolls, or guide disks,-
  • the blankthus becomes substantially elliptical in cross section with a larger interior circumference than the circumference of the mandrel, the ellipticity, or bulging form of the blank, being much less, however, than it would be if the lateral bulging were not limited by the guide disks.
  • the elliptically-sha-ped blank or tube moves fortions of the cross rolls. In this way a truly cylindrical tube is formed of any desired wall thickness, depending upon-the positioning of the reducing rolls, and having an internal diameter larger than the diameter of the mandrel, and having an external diameter controlled by the positioning of).
  • Fig. l is a face view of the mill looking in the direction of feed of a blank through it, the mandrel and blank being shown in transverse section at the throat of the pass;
  • Fig. 2 a vertical central sectional view through the mill taken on the line II- II, Fig. 1;
  • Fig. 3 a horizontal sectional View taken on the line III-III, Fig. 2;
  • Fig. 4 a sectionalview through a mandrel and reduced tube, the plane of view being indicated by the line IV-IV, Fig. 3.
  • the mill illustrated in the drawings comprises a pair of oppositely disposed cross rolls 1 having their axes inclined to each other and to the line of feed of a blank between them. Although these rolls are shown as of general barrel shape form, they may be of mushroom or of any other suitable shape. Disposed between the cross rolls, and on opposite sides of the pass between them, there.
  • the cross rolls 1 reduce the wall thickness of the tubular blank in the usual manner, causing the metal thereof to flow peripherally and to some extent longitudinally, and they cause the blank to bulge laterally from the surface of the mandrel and in engage ment with the surfaces of the driven grooved rolls or disks 2 which prevent its further lateral bulging, and accordingly determine the ultimate circumference of the reduced tube, and which rolls or disks divert longitudinally of. the blank the peripheral flow of the metal, and exert a pull on the blank in the direction of its longitudinal movement.
  • the cross rolls 1 are .each provided with surfaces 7 which flare outwardly from the neck of the pass which they form, and hence gradually reduce the major and increase the minor axis of theelliptical blank until they merge into the diameter of a cylindrical tube.
  • This action of the flaring surfaces of the cross rolls may be varied by suitable-adjustment of the axes of the rolls, as well as by the initial taper of the surfaces.
  • the grooved guide rolls 2 are driven to rotate in the direction of movement of a blank passing between them, and at such angular velocity as to greatly reduce or to eliminate transverse friction between their surfaces and that of the. rotating blank upon which 'eral speed of the guide rolls, with the reducing rolls set at the feed angle shown in the drawings, or at any desired angle within the range of customary practice for cross'. rolling mills, will, of course, according to this formula, be greater than the peripheral speed of the blank and, therefore, of the reducing rolls. and substantiallyin excess of the speed of the longitudinalmovement of the blank. -By thus overcoming transverse friction between the surfaces of grooved rolls and the rotating blank, wear on thegrooved rolls is reducedtofa minimum, and the tendency of the grooved rolls to tear or otherwise prejudicially act upon the metal is eliminated.
  • the average of the minimum distance between their working surfaces and the minimum distance between the cross rolls at the neck of the pass is approximately the outer diameter of the desired tube.
  • the maximum distance atwhich the grooved rolls may be spaced from the mandrel is that at which the material of the blank will tolerate, without in jury, repeated bending'in its changes from its original cylindrical form to its maximum elliptical and then to its final cylindrical form. 4
  • the invention may be practiced on either heated or cold cylindrical blanks. lVith either, the cross rolls act upon the metal between them and the mandrel to effect a reduction in wall thickness-of a blank, while the grooved guide rolls, contacting with the exterior surfaces of a blankwhich is unsupported by the mandrel, serve to determine the ultimate diameter of the reduced tube and aid in feeding the blank through the pass. While the method is applicable to reduction of both hot and cold blanks, it. is especially advantageous in the reduction of hot blanks in that it eliminates the possibility I proved method, in the practice of it I have manufacture seamless tubing from wrought of a reduced heated blank shrinking upon the mandrel with the attending difliculties previously explained.
  • i 1 The method of reducing the wall thickness and elongating a tubular metal blank, which comprises cross-rolling the blank on a mandrel between helically acting reducing rolls on opposite sides of the blank to reduce the wall thickness of the blank and cause it to bulge laterally away from the mandrelbetween the rolls and to feed the blank longitudinally; and diverting longitudinally the peripheral flow of the metal, and limiting the bulging of the blank to determine the di ameter of the formed tube, and pulling the blank forward in the pass, by surfaces bearing on the blank between the reducing rolls andmoving in the direction of the longitudinal movement of the blank ata speed greater than the speed of longitudinal move- 7 ment of the blank; thereby forming atube of greater. internal circumference than the mandrel.
  • the method of reducing the wall thickness andelongating a tubular metal blank which comprises cross-rolling the blank on a mandrel between helically acting reducing rolls on opposite sides of the blank to reduce the wall thickness of the blank and cause it to bulge laterally away from the mandrel between the rolls and to feed the blank longitudinally; and diverting longitudinally the peripheral flow of the metal, and limiting the bulging of the blank to determine the diameter of the formed tube, and pulling the blank forward in the pass, by guide disks bearing on the blank between the reducing rolls and rotating to move in the direction I of the longitudinal movement of the blank at a speed greater than the speed of longi- 'tudinal movement of the blank; and promandrel between helically-acting reducing rolls on opposite sides of the blank to reduce the wall thickness of the blank and cause it to bulge laterally away from the mandrel between the rolls and to feed the blank longitudinally; and diverting longitudinally the peripheral flow of the metal, and limiting the bulging of the blank, and pulling the
  • the method of reducing wall thickness and elongating tubular metal blanks which comprises cross-rolling a blank on a mandrel between reducing rolls acting in conjunction with rotating guide disks, the reducing rolls reducing the Wall thickness of the blank and causing it to take a bulging form between the cross-rolling rolls, and the guide disks divert- 1ng longitudinally the peripheral flow of the metal and limiting the lateral bulging of the blank and pulling the blank forward, and determining the diameter of the formed tube independently of the setting of the reducing rolls by adjusting the guide disks toward and from the mandrel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Extraction Processes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US527652A 1931-04-04 1931-04-04 Method of reducing and elongating tubular blanks Expired - Lifetime US1870209A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL37171D NL37171C (ru) 1931-04-04
BE387492D BE387492A (ru) 1931-04-04
US527652A US1870209A (en) 1931-04-04 1931-04-04 Method of reducing and elongating tubular blanks
GB7838/32A GB380000A (en) 1931-04-04 1932-03-16 Improvements relating to the manufacture of seamless tubing
DED63180D DE649754C (de) 1931-04-04 1932-03-24 Verfahren zum Walzen nahtloser Rohre
FR734256D FR734256A (fr) 1931-04-04 1932-03-26 Perfectionnements à la fabrication de tubes sans soudure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US527652A US1870209A (en) 1931-04-04 1931-04-04 Method of reducing and elongating tubular blanks

Publications (1)

Publication Number Publication Date
US1870209A true US1870209A (en) 1932-08-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US527652A Expired - Lifetime US1870209A (en) 1931-04-04 1931-04-04 Method of reducing and elongating tubular blanks

Country Status (6)

Country Link
US (1) US1870209A (ru)
BE (1) BE387492A (ru)
DE (1) DE649754C (ru)
FR (1) FR734256A (ru)
GB (1) GB380000A (ru)
NL (1) NL37171C (ru)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE747926C (de) * 1936-10-02 1944-10-20 Schraegwalzwerk
DE1017122B (de) * 1955-05-17 1957-10-10 Delta Kuehlschrank G M B H Verfahren und Vorrichtung zur Herstellung von Stahlrohren
US3845646A (en) * 1971-11-11 1974-11-05 Mannesmann Roehren Werke Ag Diagonal rolling mill
US4470282A (en) * 1981-04-10 1984-09-11 Sumitomo Kinzoku Kogyo Kabushiki Gaisha Method of piercing in seamless tube manufacturing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4007406C2 (de) * 1990-03-06 1994-01-20 Mannesmann Ag Verfahren zur Herstellung von mittel- und dünnwandigen nahtlosen Rohren und Walzeinrichtung zur Durchführung des Verfahrens
CN105234179B (zh) * 2015-11-02 2017-03-22 浙江格洛斯无缝钢管有限公司 利用二辊斜轧机进行厚壁无缝钢管的定径工艺及轧制工艺

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE747926C (de) * 1936-10-02 1944-10-20 Schraegwalzwerk
DE1017122B (de) * 1955-05-17 1957-10-10 Delta Kuehlschrank G M B H Verfahren und Vorrichtung zur Herstellung von Stahlrohren
US3845646A (en) * 1971-11-11 1974-11-05 Mannesmann Roehren Werke Ag Diagonal rolling mill
US4470282A (en) * 1981-04-10 1984-09-11 Sumitomo Kinzoku Kogyo Kabushiki Gaisha Method of piercing in seamless tube manufacturing

Also Published As

Publication number Publication date
GB380000A (en) 1932-09-08
BE387492A (ru)
DE649754C (de) 1937-09-07
NL37171C (ru)
FR734256A (fr) 1932-10-19

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