US1778111A - Process of and apparatus for expanding blanks by rolling - Google Patents

Process of and apparatus for expanding blanks by rolling Download PDF

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Publication number
US1778111A
US1778111A US343781A US34378129A US1778111A US 1778111 A US1778111 A US 1778111A US 343781 A US343781 A US 343781A US 34378129 A US34378129 A US 34378129A US 1778111 A US1778111 A US 1778111A
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Prior art keywords
blank
rollers
constant
rolling
expanding
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Expired - Lifetime
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US343781A
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English (en)
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Kocks Fritz
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Individual
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Individual
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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
    • B21B19/06—Rolling hollow basic material, e.g. Assel mills
    • B21B19/08—Enlarging tube diameter

Definitions

  • My invention relates to an apparatus for expanding blanks by rolling, more particularly by means of inclined rollers. It is an object of my invention to reduce the stress eX- 5 erted on the material in rolling down its sections, which in the process as performed heretofore often became excessive so that the blanks were broken.
  • the distance line (a) which extends at right angles tothe axis of the blank and ends at the axis of the roller, is dividedby the point of lcontact between the blank and the rolls at the same ratio for. all positions of the point of contact.
  • Expanding a tubular blank means increasing its outer and inner diameters and reducing its wall thickness while the length remains constant. lith constant length, however, the cross-sectional area of the blank will also remain constant as the volume remains constant.
  • the product of the sectional area Q, and the feed velocit-y V, i. e. the volume, 7 should be constant applies also to mills having inclined rollers, and as the cross-sectional area Q, is constant if the blank is only expanded Without altering its length, it follows that with the product Q, V constant, and one of the factors a constant, the other factor must also be a constant, i. e. V, the velocity which the rollers impart to the blank in the direction of its axis, must be the same at all points where the rollers are in contact with the blank.
  • My invention will be described as applied to a mill in which a tubular blank is placed on a mandrel but it may also be applied to mills in which a solid blank is made into a tube, and the tube is then expanded by my process.
  • Fig. l is a plan View of a rolling mill having three inclined rollers, the gearing being not shown,
  • Fig. 2 isl an .elevation of they mill, in section along the axis* of the blank,
  • Fig.v 4 isa perspective illustration on a l largerscale showing a mill having two rollers instead of three as illustrated in Figs.
  • Figs. 5,6 and 7 are sections on the correspondiner lines in Fig. 4 showing various stages ofB the rolling process
  • Figs. 8, 9 and l0 are the diagrams referred to,
  • Fig. 11 is a diagram of'velocities.
  • Figs. 1, 2 and 3 1 and 2 are circular housings which are supported on suitable foundation bars 3 and 4.
  • 5, 6 and 7 are three tapered and inclined rollers supported inthe housings 1, 2and adapted to be rotated through the medium of shafts 8, 9 and l() from any suitable gearing, not shown.
  • the shafts are connected to the roller shafts by knuckles 11. 12 and 13.
  • Each roller is rovided with a short taper 20 at its front en the apex angle of which is larger than that of the body of the roller so that the blank is drawn in between the rollers automaticallyand feeding appliances are not-required.
  • FIG. 4 this illustrates a mill having two rollers 21 and 22 instead of the three rollers 5, 6 and 7 in Figs. 1-3, and it is understood that I am not limited to a definite number of rollers.
  • the figure also shows the mandrel 14 and the blank 17, as in Figs. 1-3, the blank being drawn in between the rollers at the feed velocity Vin the direction of the axis of the mill as indicated by the arrow.
  • the two rollers 21, 22 are equipped with tapers20 with the object setout above.
  • the mandrel 14 should be such at any given section that the inner area of the blank is equal to or slightly larger than the corresponding area of the mandrel.
  • S, S and S are the clearances corresponding to the several sections.
  • the sectional area Q, of the blank 17 is a constant and if the sections of the blank are -to be circular or approximately so throughout the process, the
  • the blank 17 is supposed to be rotating about the Y-axis.
  • the axis of one of ther rollers is supposed to extend at an angle up to the horizontal plane X-Y.
  • R is the radius of the roller at a given point of contact B, the coordinates of which are y, and z.
  • the horizontal distance of the roller axis from the origin O is p, Fig. 8. This distance and the angle ap are fundamental data for any given roller position.
  • the point B is rotating about the centre P1, Fig. 8, at the end of the radius R.
  • the circle which the point B described about the center P1 ' is defined by the equation of a sphere with the point PI as its centre and lthe section of the sphere with a plane PI B at right angles to the roller axis.
  • the feed velocity V is related to the peripheral velocity U as follows:
  • V shows that the feed -velocity is a constant when the only variable in the equation, to wit m, is a constant, and m will be a co-nstant if the said ratio y1' a of the radius 1' of the blank to the extension of the radius as far as the intersection PH with theroller axis is a constant.
  • the radius R of the rolls results from the condition that should be a constant, or that the ratio r t a should be a constant, and is calculated from the equation:
  • the rotary velocity D is found from Figs. 8-11 to be v *x cos ap where n is the number of revolutions of the roller.
  • N will be a constant when the only variable w is a constant and this was already establishedl as the principal requirement in connection with my invention.
  • the axes of the rollers 21 and 22 are inclined to the axis Yy of the blank at the angle ap, Fig. 9, and the distance of their axes from the axis Y of the blank isp, as in Fig. 8.
  • the rollers are so sized throughout and in such a position that at all points in the effective part of the rollers, i. e. the principal part having the slighter taper as compared with the smaller part having the strong taper 20.
  • the ratio of the outer radius 'r of the blank to the said extensions a of the radius i' is a constant. If 1", 1" and 1" are radii of the blank at three distinct points and a', a and a are the corresponding vertical distances, this condi tion is expresed by the equation:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
US343781A 1928-03-31 1929-03-01 Process of and apparatus for expanding blanks by rolling Expired - Lifetime US1778111A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE308783X 1928-03-31

Publications (1)

Publication Number Publication Date
US1778111A true US1778111A (en) 1930-10-14

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US343781A Expired - Lifetime US1778111A (en) 1928-03-31 1929-03-01 Process of and apparatus for expanding blanks by rolling

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US (1) US1778111A (enrdf_load_stackoverflow)
BE (1) BE357808A (enrdf_load_stackoverflow)
FR (1) FR669169A (enrdf_load_stackoverflow)
GB (1) GB308783A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150292127A1 (en) * 2012-12-28 2015-10-15 Kuraray Co., Ltd. Drawing device and drawing method
CN111842743A (zh) * 2020-08-26 2020-10-30 太原科技大学 一种管筒形工件双环辊内接触式旋轧方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006053773B4 (de) * 2006-11-15 2008-11-20 Sms Meer Gmbh Verfahren zum Walzen eines Langguts in einem Walzwerk

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150292127A1 (en) * 2012-12-28 2015-10-15 Kuraray Co., Ltd. Drawing device and drawing method
US10106919B2 (en) * 2012-12-28 2018-10-23 Kuraray Co., Ltd. Drawing device and drawing method
CN111842743A (zh) * 2020-08-26 2020-10-30 太原科技大学 一种管筒形工件双环辊内接触式旋轧方法

Also Published As

Publication number Publication date
BE357808A (enrdf_load_stackoverflow)
FR669169A (fr) 1929-11-13
GB308783A (en) 1930-08-20

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