US2233869A - Cold working metal bar - Google Patents

Cold working metal bar Download PDF

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Publication number
US2233869A
US2233869A US250737A US25073739A US2233869A US 2233869 A US2233869 A US 2233869A US 250737 A US250737 A US 250737A US 25073739 A US25073739 A US 25073739A US 2233869 A US2233869 A US 2233869A
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US
United States
Prior art keywords
bar
rolls
twisting
working
rod
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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US250737A
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English (en)
Inventor
Lukacs Ernst
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Individual
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Individual
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Publication date
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Publication of US2233869A publication Critical patent/US2233869A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/14—Twisting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12333—Helical or with helical component

Definitions

  • My invention relates yto metal bars ⁇ and more particularly to a method -of an apparatus for cold working round, or nearly round, metal bars of commercial quali-ty, such as round iron rods, by means of twisting.
  • round or nearly wund metal bars used hereinafter, does notl include bars provided with projections such as ribs, for example section or profiled iron, and the invention is not to be construed as including the Vtreatmc-znt of such bars.
  • the object of my invention is .to provide cold worked iron rods with markings indicative of the the other until they undergo permanent deformartion.
  • I provide the round or nearly round metal bar, such as a round iron rod, to be worked by means of twisting, either before or at the same time as it is so worked, with a marking which represents, after the working, a pattern in the shape of a helical line, the pitch of which is substantially inversely proportional to the degree of working, while this proportion may be either linear or non-linear.
  • My invention may, for example, be carried out by providing on the metal bar, before it is worked, small impressions, such as fiuting or milling, running parallel to the axis of said bar, which assume vthe form of 'a helical line when the bar undergoes twisting.
  • the impressions may n-aturally be replaced by any other desired markings, for example coloring or the like.
  • the pattern which appears Iafter .the working may be of any type, while any two points can be fixed on the pattern lbetween which the pitch of lthe helical 10 line is measured.
  • the advantage of my method consists in that patterns are produced on the outer surface of .the metal bar which enable the yield point and ytensile strength of the bar .to be deduced with certainty.
  • My method also affords the additional advantage that the regularly distributed uneven Iportions of the surface of the pbar substantially increase .the adhesion of the ir-on rod in the embedding medium, such as concrete.
  • the metal bar is drawn through a pair 4of loaded rolls, one or both of which are grooved. or through a grooved tool, and then one end of the bar is gripped in a stationary jaw while the other end 'is turned until ythe desired increase in lthe yield point has taken place.
  • the degree of f torsion-can be measured with a revolution counter, which in turn can be coupled, if desired, with a per se known automatic disconnecting device, by -which the-apparatus used for twisting the bar is automatically disconnected when the desired screw pitch is attained.
  • the metal bar is passed between rolls, one or. both of which are grooved and lthe axes of which are not parallel, being drawn therethrough either on a draw bench, by means of gripping pliers, or with the aid of a pair of rolls.
  • the gripping pliers should not perform any rotary movement.
  • Fig. 1 is a diagrammatic side elevation of one embodiment of my apparatus
  • Fig. 3 is a View of a marked metal bar before the twisting operation
  • Fig. 4 shows .the same bar after the twisting operation
  • Fig. 5 is a side elevation of -a second embodiment -of my apparatus
  • Fig. 6 is atop view of the same
  • Fig. 7 is a side elevation, partly in section, of
  • Fig. 8 is a top view of the same
  • Fig. 9 l is a characteristic curve showing the improvement of .the mechanical properties as a function of the degree of twist.
  • Figs. 1 and 2 the simplest form lof the apparatus, in which a pair of rotary rolls, consisting of a grooved upper vroll I and an even lower roll 2, is employed, the upper roll I being mounted with'its axis I1 in a pair of levers I 8 pivoted at I9 on a bracket 20 constitutinga part of the supporting frame 2
  • a pair of rotary rolls consisting of a grooved upper vroll I and an even lower roll 2
  • the upper roll I being mounted with'its axis I1 in a pair of levers I 8 pivoted at I9 on a bracket 20 constitutinga part of the supporting frame 2
  • 'I'he levers I8 support a weight 3, so that the upper roll I is constantly pressed against the lower roll 2.
  • axis 22 of the lower roll 2 is rotatably mounted in stationary bearings 23 which form a part of the frame 2l. If a round iron rod g be now drawn through the pair of said rolls inv any desired direction, the groovings provided on the upper roll will be impressed into the iron rod, as shown in Fig. 3.' In the marking apparatus shown in Figs. 1 and 2, a pair of rolls 24, 25 are used to move the rod g forward between the marking rolls I and 2.
  • the forwarding rolls 24, 25 are rotatably mounted in alignment with the marking rolls I and 2, the lower roll 25 having stationary bearings, while the upper roll 24 is journaled in a bearing block 42 which is slidably mounted in the frame 2
  • the rolls 24 and 25 are rotated with equal peripheral speeds by toothed wheels 24' and 25', respectively, which mesh with one another and with a pinion 28 driven by a motor not shown in the drawings. If the rod g which leaves the apparatus shown in Figs. 1 and 2 with the marking i impressed upon it (Fig.
  • the pitch e of the helical line is substantially inversely proportional to the degree of working and can be limited with the aid of an automatic disconnecting device.
  • theiapparatus comprises gripping pliers 5 and grooved rotary rolls 6, 1, the axes 8, 9 of which are not parallel to one anotherbut lie in parallel planes.
  • the axes 8 and 9of the rolls 6 and 1 are journalled in bearing blocks 29 and 30, respectively, said blocks beingslidably mounted in the supporting frame 3
  • the screws 32 are rotatably connected with the bearing blocks 29 and 30. By turningthe adjustment screws 32, the rolls 6 and' 1 may be pressed against the rod y. Gripping pliers 5 are then used to move the rod forward between-the rolls.
  • Figs. 7 and 8 consistsoi gripping pliers Il and a grooved upper roll .I2 and an even lower roll I3, theaxes I4, I5 of which are parallel and which, in'addition to their rotation about their own axes, also revolve about the axis of the iron rod g.
  • the rolls. are mounted in a trunnioned frame I6 rotatably mounted in a pedestal I1.
  • the trunnions 39 of the frame I6 are hollow, so that the rod g can be moved through them to and from the rolls I2 and I3.
  • the frame I6 is rotated by a toothed wheel 40 which is xed upon one of the trunnions 39 and meshes with a pinion 4I.
  • the pinion 4I is journaled in the pedestal I1 and is driven by a motor not shown in the drawings.
  • 'I'he gripping pliers Il as well as other elements drawing the rod between the rolls I2. and I3 are identical to those provided in the device illustrated in Figs. 5 and 6 or the drawings. If the iron rod g be nowpdrawn by means of the gripping pliers I I (or by means of a pair of rolls) between the rollsv I2, I3, in the direction of the arrow I8, it will undergo torsion in a similar way as in the example shown in Figs. 4 and 5, and at the same time patterns in the form of a helical line will be produced on its surface and will be indicative of the degree of torsion.
  • the raising of the yield point or of the tensile strength can be represented, as shown in Fig. 9, in the function of al fraction e/D, the numerator e of which represents the pitch ofy thefhelical line appearing after the working and the denominator D or which represents the diameter of same diameter D the pitch e of the helical line decreases.
  • the method of the invention is also suitable for ymarking round or nearly round metal bars the tensile strength of which varies in the di-frection of the length by twisting the bar according to a helical line of varying pitch, for example with the aid of the apparatus illustrated in Figs. 5 to 8, the pattern appearing on the surface of the bar after the working automatically and immediately indicating the varying tensile strength.
  • variation of the pitch vof the helical line along a. bar which has been twisted in a uniform manner throughout its length indicates that the bar was originally defective, i. e. of varying resistance against torsional stress.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Metal Rolling (AREA)
US250737A 1937-10-09 1939-01-13 Cold working metal bar Expired - Lifetime US2233869A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HU520333X 1937-10-09

Publications (1)

Publication Number Publication Date
US2233869A true US2233869A (en) 1941-03-04

Family

ID=10979470

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Application Number Title Priority Date Filing Date
US250737A Expired - Lifetime US2233869A (en) 1937-10-09 1939-01-13 Cold working metal bar

Country Status (5)

Country Link
US (1) US2233869A (en:Method)
BE (1) BE436992A (en:Method)
CH (1) CH215348A (en:Method)
FR (1) FR861494A (en:Method)
GB (1) GB520333A (en:Method)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594503A (en) * 1947-05-23 1952-04-29 United States Steel Corp Movable jaw chucking device
EP0011175A1 (de) * 1978-11-09 1980-05-28 Bayer Ag Verfahren und Vorrichtung zur Herstellung von gewendelten Streifen
US4367641A (en) * 1980-01-21 1983-01-11 Inoue Mtp Kabushiki Kaisha Apparatus for bending and twisting elongated pieces
US4654912A (en) * 1984-09-18 1987-04-07 Gray John C Production of threaded metal rods for making U-bolts
US4897117A (en) * 1986-03-25 1990-01-30 Teledyne Industries, Inc. Hardened penetrators
US20090171320A1 (en) * 2007-12-26 2009-07-02 Terumo Kabushiki Kaisha Medical elongate member, method of manufacturing the same, and apparatus for manufacturing the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103264079A (zh) * 2013-05-29 2013-08-28 江阴中南重工股份有限公司 无芯轴螺旋叶片旋扭机

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594503A (en) * 1947-05-23 1952-04-29 United States Steel Corp Movable jaw chucking device
EP0011175A1 (de) * 1978-11-09 1980-05-28 Bayer Ag Verfahren und Vorrichtung zur Herstellung von gewendelten Streifen
US4367641A (en) * 1980-01-21 1983-01-11 Inoue Mtp Kabushiki Kaisha Apparatus for bending and twisting elongated pieces
US4654912A (en) * 1984-09-18 1987-04-07 Gray John C Production of threaded metal rods for making U-bolts
US4897117A (en) * 1986-03-25 1990-01-30 Teledyne Industries, Inc. Hardened penetrators
US20090171320A1 (en) * 2007-12-26 2009-07-02 Terumo Kabushiki Kaisha Medical elongate member, method of manufacturing the same, and apparatus for manufacturing the same
US8613878B2 (en) * 2007-12-26 2013-12-24 Terumo Kabushiki Kaisha Medical elongate member, method of manufacturing the same, and apparatus for manufacturing the same

Also Published As

Publication number Publication date
GB520333A (en) 1940-04-22
CH215348A (de) 1941-06-30
BE436992A (en:Method)
FR861494A (fr) 1941-02-10

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