US3924431A - Machine for straightening elongated objects - Google Patents

Machine for straightening elongated objects Download PDF

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Publication number
US3924431A
US3924431A US501149A US50114974A US3924431A US 3924431 A US3924431 A US 3924431A US 501149 A US501149 A US 501149A US 50114974 A US50114974 A US 50114974A US 3924431 A US3924431 A US 3924431A
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US
United States
Prior art keywords
rollers
straightening
workpiece
rolls
straightening machine
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
US501149A
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English (en)
Inventor
Heinz Hartkopf
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.)
TH Kieserling and Albrecht GmbH and Co
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TH Kieserling and Albrecht GmbH and Co
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
Application filed by TH Kieserling and Albrecht GmbH and Co filed Critical TH Kieserling and Albrecht GmbH and Co
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Publication of US3924431A publication Critical patent/US3924431A/en
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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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
    • B21D3/04—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes skew to the path of the work

Definitions

  • This invention relates to straightening devices, and more particularly to equipment for straightening elongated workpieces such as rods or pipes.
  • Straightening equipment of the type contemplated generally employs opposed straightening rolls, rotating about longitudinal axes which are at an angle to the longitudinal axis of the workpiece.
  • the rolls on one side may be divided into three rollers, each mounted upon parallel axes, with the outer rollers being eccentn'cally mounted and adjustable along an arcuate path, relative to the central roller.
  • the present invention uses a unique arrangement of a segmented roll having three rollers to reduce or eliminate the forces which create excess wear.
  • This arrangement positions the points or lines of contact between the three rollers and the workpiece such that they lie substantially within a plane which also contains the longitudinal axis of the workpiece. To efi'ect this, the two outer rollers are displaced in relation to the central roller, towards the workpiece, so that the centers of the three rollers and the longitudinal axis of the workpiece define a plane. Since the rollers and workpiece are of circular cross section, if the line joining the centers of the three rollers lies in the same plane with the longitudinal axis of the workpiece, the points or lines of contact will lie in the same plane.
  • the two outer rollers are the corners of the triangle of bending and, according to the invention, they act as straightening rolls.
  • the forces applied by the outer rollers to the work-piece are, at least theoretically, pure bending forces and have no detrimental components such as transverse forces.
  • the forces applied by the rollers to the workpiece all lie in the plane which includes the centers of the rollers and the workpiece, and they are all theoretically absorbed by the second roll, the center of which lies in the same plane.
  • Straightening with a divided hyperbolic roll according to the invention is basically a problem of planes, and any straightedge serves merely as a guide subjected to a minimum of wear. Because of the reduced pressure of the work- 2 piece upon such a straight-edge, synthetic materials may be used along the working edges. In fact, the entire straight-edge may be made of synthetic material.
  • Another object of the invention is to provide a straightening device which creates a minimum of wear upon the guiding straight-edges.
  • Another object of the invention is to provide a straightening device having improved spring characteristics and ease of roll adjustment.
  • straightening equipment for elongated worpieces is provided with opposed straightening rolls having their axes positioned at an angle to the longitudinal axes of the workpiece.
  • One of the straightening rolls is segmented into three separate rollers mounted on parallel axes, the two outer rollers being mounted eccentrically in relation to the central roller and being adjustable in relation thereto, along an arc.
  • the points of contact between the rollers and the workpiece are arranged to lie in the same plane as the longitudinal axes of the workpiece.
  • FIG. 1 is a front elevation of a straightening unit according to an illustrative embodiment of the invention
  • FIG. 2 is a horizontal section through the unit shown in FIG. 1, at the level of the straightening gap;
  • FIG. is a plan view of FIG. 2.
  • FIG. 1 illustrates a straightening machine having a main frame 1 with a table 2 and two side members 3, 4 extending upwardly therefrom to define a U-shaped gap. Apertures 11 and 12 are provided in the diagonally opposite lateral faces of the side members 3, 4 so that the workpiece may pass diagonally through the straightening machine.
  • a segmented top straightening roll 5 is mounted in the side members 3, 4 within the gap, and is divided into three parts, or rollers, 5a, 5b, 50.
  • a bottom straightening roll 6 is mounted in journals 7 directly below top roll 5. The journals 7 run in a roll holder 8 that is mounted to the table 3 in a vertically adjustable manner. A threaded shaft, hydraulic system, or other means may be provided for this adjustability.
  • Straight-edges are provided approximately along the path of the workpiece between the top and bottom rolls, for the purpose of guiding the workpiece. For reasons of clarity, only a rear straight-edge 9, with wearing edges 9a, 9b, is shown.
  • the straight-edge 9 has a recess 10 for bottom roll 6.
  • Outer rollers 5a, 5c are eccentrically mounted relative to center rol1er5b and to adjust for sag or bowing of the workpiece, adjusting mechanisms 13, 14 are provided. These mechanisms permit the raising or lowering of the outer rollers along a slightly curved path.
  • FIGS. 2 and 3 The position of a workpiece 15 relative to the rollers 5a, 5b, 5c is seen in FIGS. 2 and 3.
  • Center lines 16, 17 show that the two outer rollers 5a, 50 are mounted eccentrically of the center roller 5b, the outer rollers being displaced towards the workpiece 15 which advances diagonally through the straightening machine. This establishes points of contact 20, 21, 22 directly below .the center lines of the "relevant rollers, i.e. contact point 20 lie's vertically below center line 16,
  • contact point 21 lies vertically below center line 18, and contact point 22 lies vertically below center line 17.
  • the plan view of FIG. 3 shows clearly that contact points 20, 21, 22 lie vertically under the roller centers and in the same plane as the dotted center line 23 of work-piece 15. Center line 23 also represents the straightening plane.
  • rollers may be driven by a driving wheel 24; the central roller being driven directly and the two outer rollers by planetary drives.
  • Typical design details for driving the outer rollers appear in aforecited German Auslegeschrift DT-AS No. 2,113,713.
  • Bottom roll 6 may be driven by a motor via a cardan shaft and transmission.
  • Roll holder 8 may have a bearing adapted to rotate about a vertical axis passing through the center of bottom roll 6 and/or hydraulic support means for the said holder.
  • outer rollers 5a, 5c are lowered to a sufficiently great extent, the workpiece can be prevented from coming into contact with center roller 5b. This enables the machine to execute free bends. Embossing or polishing can be carried out by raising the outer rollers 5a, 5c.
  • the hyperbolic form of the straightening roll is ad vantageous; however, as noted above the main defect of this hyperbolic form is the production of transverse forces.
  • the outer rollers 5a, 5c of the segmented roll 5 are provided with convex surfaces, while the inner roller 5b is provided with a concave surface.
  • the straightening gap is controlled by vertical positioning of the bottom roll 6 only.
  • the straightening gap is adapted to the diameter of the workpiece being handled and variations in the straightening gap cause a displacement of the longitudinal axis of the workpiece. For example, when changing from a larger to a smaller diameter workpiece, the center line of the workpiece is displaced in an upward direction. This requires commensurate displacement of the input and output channels.
  • the sag required for straightening increases and the ends of the workpieces projecting beyond the rolls, drop. This leaves only the difference in displacement and sharply reduces the necessary adjustability of the input and output channels as a whole.
  • a straightening machine for elongated workpieces comprising: opposed straightening rolls having axes positioned at an angle to the longitudinal axis of the workpiece, one of said straightening rolls including three rollers mounted on parallel axes, the two outer rollers being mounted eccentrically in relation to the center roller and being adjustable in relation thereto along an arc, the points of contact between said rollers and said workpiece being in a plane with the longitudinal axis of the workpiece.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
US501149A 1973-09-05 1974-08-28 Machine for straightening elongated objects Expired - Lifetime US3924431A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2344613A DE2344613C3 (de) 1973-09-05 1973-09-05 Zwei-Walzen-Richtmaschine für Rundmaterial wie Stangen und Rohre

Publications (1)

Publication Number Publication Date
US3924431A true US3924431A (en) 1975-12-09

Family

ID=5891608

Family Applications (1)

Application Number Title Priority Date Filing Date
US501149A Expired - Lifetime US3924431A (en) 1973-09-05 1974-08-28 Machine for straightening elongated objects

Country Status (11)

Country Link
US (1) US3924431A (xx)
JP (1) JPS544338B2 (xx)
CA (1) CA1020442A (xx)
DD (1) DD112361A1 (xx)
DE (1) DE2344613C3 (xx)
ES (1) ES428777A1 (xx)
FR (1) FR2242167B1 (xx)
GB (1) GB1429398A (xx)
HU (1) HU169561B (xx)
IT (1) IT1020485B (xx)
SU (1) SU576017A3 (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2389427A1 (xx) * 1977-05-05 1978-12-01 Bronx Eng Co
USRE36409E (en) * 1995-01-09 1999-11-30 International Paper Company Circular saw leveling and tensioning machine
US11179759B2 (en) 2015-07-22 2021-11-23 Sms Group Gmbh System and method for removing flatness faults from a metal flat product

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747386A (en) * 1971-03-22 1973-07-24 Kieserling & Albrecht Straightening apparatus for elongated tubular and rod stock

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747386A (en) * 1971-03-22 1973-07-24 Kieserling & Albrecht Straightening apparatus for elongated tubular and rod stock

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2389427A1 (xx) * 1977-05-05 1978-12-01 Bronx Eng Co
USRE36409E (en) * 1995-01-09 1999-11-30 International Paper Company Circular saw leveling and tensioning machine
USRE37833E1 (en) * 1995-01-09 2002-09-10 International Paper Company Circular saw leveling and tensioning machine
US11179759B2 (en) 2015-07-22 2021-11-23 Sms Group Gmbh System and method for removing flatness faults from a metal flat product

Also Published As

Publication number Publication date
GB1429398A (en) 1976-03-24
JPS5053269A (xx) 1975-05-12
DE2344613B2 (de) 1979-02-22
CA1020442A (en) 1977-11-08
HU169561B (xx) 1976-12-28
DE2344613A1 (de) 1975-03-20
DE2344613C3 (de) 1979-10-25
FR2242167A1 (xx) 1975-03-28
FR2242167B1 (xx) 1978-08-11
DD112361A1 (xx) 1975-04-12
SU576017A3 (ru) 1977-10-05
ES428777A1 (es) 1976-11-16
IT1020485B (it) 1977-12-20
JPS544338B2 (xx) 1979-03-06

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