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US3757557A - Hydraulic stretch levelling machine - Google Patents

Hydraulic stretch levelling machine Download PDF

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Publication number
US3757557A
US3757557A US00241625A US3757557DA US3757557A US 3757557 A US3757557 A US 3757557A US 00241625 A US00241625 A US 00241625A US 3757557D A US3757557D A US 3757557DA US 3757557 A US3757557 A US 3757557A
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United States
Prior art keywords
stretch
gripper head
hydraulic
counter
wheels
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Expired - Lifetime
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US00241625A
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English (en)
Inventor
E Kost
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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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • 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
    • B21D3/12—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 stretching with or without twisting

Definitions

  • ABSTRACT Hydraulic stretch levelling machines have a stretch gripper head which is powered by a hydraulic piston and cylinder drive unit in order to stretch level a workpiece; the other end of the workpiece is secured by a counter gripper head which includes an anchoring mechanism for anchoring it in position and which is adjustable at discrete intervals for allowing for different sizes of workpiece.
  • the invention relates to a hydraulic stretch levelling machine for stretching workpieces such as sections and plate, the machine having a stretch gripper head which is movable in the stretch levelling direction for stretching a workpiece and is connected (directly or e.g.
  • a hydraulic piston and cylinder driving means and normally to the piston thereof
  • a co-operating counter gripper head which is adjustable at discrete intervals in the stretch levelling direction and has engageable and diS- engageable anchoring means;
  • the machine has means for adjusting the distance apart of the gripper heads, and also force transmitting means such as frames, columns or metallic tie members which can be embedded in foundations and have anchoring projections, anchoring recesses or anchoring apertures disposed at intervals to obtain the adjustment of the counter gripper head.
  • the distances between anchoring projections, anchoring recesses or anchoring apertures for anchoring the counter gripper head are generally designed in accordance with the maximum expected variations in length of the workpieces which are to be stretchlevelled on the stretch levelling machine.
  • the mechanical strength of the workpiece cross-sections remaining between the anchoring recesses or anchoring apertures in the frame or tie members can define the magnitude of the distances between anchoring positions.
  • the maximum length of stroke of the stretch gripper head or of the hydraulic piston and cylinder driving means in such hydraulic stretch leveller machines is equal to the length of stretching stroke of the stretch gripper head, which length corresponds to the maximum stretch of the longest workpiece which is to be stretched, plus the length of approach stroke, which latter length is equal to twice the approach length or clamping length of the workpiece in the gripper head plus the distance between the anchoring positions.
  • the distances between anchoring positions are made as short as, and in many cases shorter than, would be required by the maximum workpiece length deviations within any one manufacturing programme, with due reference to the length of the piston and cylinder driving means.
  • the operating process must be interrupted and a separate operation must be interposed for stretch levelling the graded workpieces, since the counter gripper head must be reset by an amount corresponding to the distance between anchoring positions and must be anchored at that position.
  • a further disadvantage of stretch levelling machines with a hydraulic piston and cylinder driving means which performs the stretch levelling stroke as well as the approach stroke is due to the fact that the workpieces are gripped first by the stretch gripper head of the stretch levelling machine, since the workpieces are supplied to the stretch levelling machine with one end (usually the front end) aligned at a unifonn distance from the stretch gripper head, the workpieces being then pushed by the stretch gripper head over workpiece supports into the counter gripper head, in some circumstances over a distance corresponding to the length of one gripper and over a distance corresponding to the distance between anchoring positions. This results in score marks appearing, particularly on workpieces made of non-ferrous metals.
  • the present invention provides a hydraulic stretch levelling machine having a stretch gripper head which is movable in a stretch levelling direction for stretching a workpiece,
  • a hydraulic piston and cylinder driving means connected to the stretch gripper head for retracting the stretch gripper head to stretch a workpiece
  • a co-operating counter gripper head which is movable in the stretch levelling direction towards and away from the stretch gripper head
  • engageable and disengageable anchoring means for anchoring the counter gripper head in one of a plurality of spaced positions which are different distances from the stretch gripper head, the anchoring means being movable in the stretch levelling direction, independently of the counter gripper head, and
  • connecting means connecting the counter gripper head to the anchoring means, the connecting means being steplessly variable in the stretch levelling direction to permit the distance of the counter gripper head from the anchoring means to be altered.
  • the counter gripper head is separated from the anchoring means and is connected thereto by connecting means which may be adjusted in the stretch levelling direction; the position of the counter gripper head can be altered in that it may be detachably joined to the anchoring means, e.g. through one tie-rod or a number of parallel tie-rods extending in the stretch levelling direction and for instance connected directly to the counter gripper head.
  • the invention can thus avoid the disadvantages referred to above because the length of stroke of the hydraulic stretch piston and cylinder driving means and its structural length need only be defined by the stretch levelling stroke, which must be performed with a large force, and need not take account of the approach stroke, which requires only small forces; the approach stroke is no longer performed by the stretch gripper head or the hydraulic stretch piston and cylinder driving means, but by the counter gripper head.
  • the connecting means (which may be referred to as a retaining device) should be capable of rapid and simple adjustment and must be capable of holding the counter gripper head at any distance from the stretch gripper head.
  • the adjustable connecting means includes at least one tie-rod extending in the stretch levelling direction
  • various clamping means for round andsmooth rods, for transmitting forces in the direction of the rod axis
  • the clamping means comprising split cylindrical bushes (split on one side) or comprising two half shells of various lengths, depending on the magnitude of the forces to be transmitted, for clamping the rod on one or both longitudinal sides by means of one or more screw-fastening connections.
  • clamping means of this kind are not preferred for the present invention for various reasons.
  • clamping means of the kind described hereinabove are not generally suitable for adjustable connecting means (retaining devices) which must be actuated rapidly and in succession without interruption.
  • At least one pressure fluid actuated clamping means surrounding the tie-rod for clamping the tie-rod on all sides with substantially uniform compressive force and for releasing the rod to alter the distance between the counter gripper head and the anchoring means.
  • Clamping means of this kind act from the exterior towards the interior and have an annular cylindrical pressure chamber and a cylindrical, resilient sleeve seal, the external periphery of which can be acted on by a pressure medium.
  • the internal periphery of the sleeve seal engages a circular crosssection clamping sleeve having axial gaps, or individual clamping segments having axial gaps disposed therebetween, the clamping sleeve or segments being constructed of a material which is harder than that of the sleeve seal material.
  • the stretch levelling machine can include a hydraulic piston and cylinder driving means for moving the counter gripper head in and opposed to the stretch levelling direction if the distances between the anchoring positions are not excessively long, the hydraulic piston and cylinder driving means being just sufficiently pow erful for the stepless movement of the counter gripper head.
  • at least one motor connected to at least one running wheel of the counter gripper head.
  • the position of the anchoring means may likewise be adjustable by means of at least one motor. it is preferred that the motors be hydraulic motors.
  • the motors can be connected to the wheels by suitable gear trains.
  • hydraulic stretch levelling machine moving parts driven solely by hydraulic pressure has the advantage that known and tried hydraulic regulating and control devices, which may be simply manually or automaticaily operated, may be employed for the control system as well as for regulating the operating functions of the hydraulic stretch levelling machine.
  • FlG. 1 is a side view of the hydraulic stretch levelling machine
  • FIG. 2 is a plan view of the hydraulic stretch levelling machine
  • FIG. 3 is a side view of the hydraulic stretch levelling machine with its counter gripper head in its forward position
  • FIG. 4 is a side view through an alternative counter gripper head and anchoring means.
  • FIG. 5 is a longitudinal section through a side view of a hydraulic retaining device, on a larger scale.
  • a stretch gripper head 3 is disposed on the left-hand side of a foundation 1 and has wheels 3a, 3b, 3c, 3d running on rails 2a, 2b; the gripper head 3 is driven, via a piston rod 5, by a stationary stretch piston and cylinder drive mechanism having a cylinder 4a and a piston 4b, and hydraulic ducts 4c and M.
  • a co-operating counter gripper head 6 is disposed on the right-hand side and has wheels 6a, 6b, dc, 6d; the gripper head 6 is connected via joints 7, a tie-rod 8 and connecting means in the form of a hydraulic retaining device it), to anchoring means 9, the anchoring means 9 running on wheels 9a, 9b, 9c, 9d.
  • the hydraulic retaining device Ill fixed in the anchoring means 9, connects the gripper head 6 to the anchoring means 9 by means of clamping means 20, 21, 22 (see H6. 5, described in more detail below) which grip around the tie rod 3.
  • the gripper head 10 can be steplessly traversed towards the stretch gripper head 3 by means of a hydraulic piston drive mechanism H, 12, 12a having a cylinder 11 and a piston 12 with a piston rod 12a, the drive mechanism 11 being disposed between the anchoring means 9 and the gripper head 6 (see FIGS. 1 and 2).
  • the anchoring means 9 is anchored in the stretch levelling direction by means of an engageable and disengageable wedge or key 14 which engages in corresponding recesses 16 in a metallic tie member 15, fixed to the foundation.
  • a device (not shown) for actuating the wedge or key 14.
  • the front pair of wheels 9a, 9b is driven through gears 18a, 18b by one or more motors 17a and 17b, for example hydraulic motors, (which motors may be coupled by a cross-shaft 18) in order to enable the anchoring means 9 to be traversed from one anchoring recess 16 to another after the wedge or key 14 is disengaged.
  • motors 17a and 17b for example hydraulic motors, (which motors may be coupled by a cross-shaft 18) in order to enable the anchoring means 9 to be traversed from one anchoring recess 16 to another after the wedge or key 14 is disengaged.
  • the counter gripper head 25 may alternatively be adjusted by means of motors, for example hydraulic motors 26, which drive the wheels 6c, dd.
  • motors for example hydraulic motors 26, which drive the wheels 6c, dd.
  • This method of drive is selected if there are great distances V between anchoring positions in the tie members 15, because in such a case long piston and cylinder drive mechanisms, even if constructed for small forces, are too expensive due to the great length, and in some circumstances such drive mechanisms cannot be constructed at all.
  • Thehydraulic retaining device (FIGS. 1 and 5) has a hollow hydraulic member 19 both ends of which have hydraulic clamping means 20, 21, 22 incorporated therein, which clamping means comprise substantially an annular cylindrical pressure chamber 20, a cylindrical sealing sleeve 21 and radially sliding metallic segments 22.
  • hydraulic clamping means comprise substantially an annular cylindrical pressure chamber 20, a cylindrical sealing sleeve 21 and radially sliding metallic segments 22.
  • One such clamping means is described in more detail in German Offenlegungschrift No. 1,922,497.
  • Metal or plastics bearing shells 24 are provided at each end of the retaining device 10 in flange covers 23, to function as guides and supports for the tie-rod 8;-the flange covers 23 are bolted onto the hollow members 19 and provide axial end closures to the annular cylindrical pressure chambers at the ends of the hollow member 19. i
  • the retaining device 10 (and hence the hollow member 19) may be of a suitable le ngth or a plurality of retaining devices 10 may be disposed end to end.
  • FIG. 1 shows, by way of example and in simplified form, a workpiece 13 in the position in which it is offered to the stretch levelling machine.
  • the distance A between the front end of the workpiece 13 and the front edge of the stretch gripper head is in operation kept as small and as constant as possible while the distance B between the rear end of the workpiece l3 arid the front edge of the counter gripper head 6 depends on the length of the workpiece, the distance B being determined by the magnitude of the severed and so-called lost end and the maximum distance B being equal to the anchoring distance V.
  • the anchoring means 9 are first traversed by means of the hydraulic motors 17a, 17b until it is'over a recess 16 which corresponds to the length of the workpiece which is to be stretched levelled, whereupon the wedge or key 14 is engaged.
  • the workpiece 13 has been moved into the stretch levelling axis and the stretch gripper head 3 has been driven out into the initial stretch levelling position by means of the hydraulic cylinder piston drive mechanism 40, 4b as shown in FIG. 1
  • the counter gripper head 6 is traversed towards the stretch gripper head 3 either by means of the hydraulic stretch cylinder piston drive mechanism 11, 12, 12a or by means of the hydraulic motors 26.
  • the workpiece After displacement through the distance B and through the clamping length E (see FIG. 1) over the rear end of the workpiece 13, the workpiece is gripped by'the hydraulically actuated gripper jaws 6e, 6f of the counter gripper head 6.
  • the hydraulically actuated gripper jaws 6e, 6f of the counter gripper head 6 In the present example, the
  • All embodiments can be arranged to be operated completely automatically so that all machine functions required for stretch levelling a workpiece may be initiated by means of a single operating knob.
  • a hydraulic stretch levelling machine comprising a stretch gripper head which is movable in a stretch levelling direction for stretching a workpiece
  • a hydraulic piston and cylinder driving means connected to the stretch gripper head for retracting the stretch gripper head to stretch a workpiece
  • a co-operating counter gripper head which is movable in the stretch levelling direction towards and away from the stretch gripper head
  • engageable and disengageable anchoring means for anchoring the counter gripper head in one of a plurality of spaced positions which are different distances from the stretch gripper head, the anchoring means being movable in the stretch levelling direction, independently of the counter gripper head, and
  • connecting means connecting the counter gripper head to the anchoring means, the connecting means being steplessly variable in the stretch levelling direcu'on to permit the distance of the counter gripper head from the anchoring means to be altered.
  • adjustable connecting means includes at least one tie-rod extending in the stretch levelling direction and at least one pressure fluid actuated clamping means surrounding the tie-rod for clamping the tie-rod on all sides with substantially uniform compressive force and for releasing the rod to alter the distance between the counter gripper head and the anchoring means.
  • said motor is a hydraulic motor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)
  • Tyre Moulding (AREA)
  • Treatment Of Fiber Materials (AREA)
US00241625A 1971-04-07 1972-04-06 Hydraulic stretch levelling machine Expired - Lifetime US3757557A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2117104A DE2117104C3 (de) 1971-04-07 1971-04-07 Hydraulische Streckrichtmaschine für Profile und Bleche

Publications (1)

Publication Number Publication Date
US3757557A true US3757557A (en) 1973-09-11

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ID=5804174

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Application Number Title Priority Date Filing Date
US00241625A Expired - Lifetime US3757557A (en) 1971-04-07 1972-04-06 Hydraulic stretch levelling machine

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US (1) US3757557A (it)
JP (1) JPS5222342B1 (it)
DE (1) DE2117104C3 (it)
FR (1) FR2132757B1 (it)
GB (1) GB1373282A (it)
IT (1) IT951149B (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934439A (en) * 1973-04-07 1976-01-27 Gebr. Happich Gmbh Draw-bending apparatus and method
US4726212A (en) * 1985-03-11 1988-02-23 Unimetal Machine for straightening and stress-relieving steel rails
US4751838A (en) * 1985-11-18 1988-06-21 Red Bud Industries, Inc. Machine and process for leveling sheet metal strip
US4827753A (en) * 1987-01-20 1989-05-09 The Cyril Bath Company Extrusion former with three-way powered movement
CN102527776A (zh) * 2012-01-09 2012-07-04 温州久一重工有限公司 张力矫直机
CN116116935A (zh) * 2023-04-19 2023-05-16 西安朴复信息科技有限公司 一种用于铝型材加工的拉直装置及其加工工艺

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2521883B1 (fr) * 1982-02-19 1985-08-30 Sacilor Procede de dressage d'un rail de chemin de fer et rail de chemin de fer dresse
EP0273604B1 (en) * 1986-12-04 1991-04-17 Kabushiki Kaisha Kosmek Die-height adjusting device of mechanical press
DE3725731A1 (de) * 1987-08-04 1989-02-16 Hasenclever Maschf Sms Kombiniertes fuehrungs- und klemmelement, insbesondere zur anwendung in pressen mit differenziertem kurz- und langhubantrieb
DE3731451A1 (de) * 1987-09-18 1989-03-30 Hasenclever Maschf Sms Formpresse zur verwendung von pressformen mit untereinander schliesspositionierten formhaelften
AT389655B (de) * 1987-12-01 1990-01-10 Haginger Peter Anlage zum herstellen von aluminiumprofilen
CN103599978B (zh) * 2013-11-27 2015-06-17 张家港市张运机械制造有限公司 电梯导轨自动矫扭机
DE102014209804A1 (de) * 2014-05-22 2015-11-26 Sms Meer Gmbh Vorrichtung in Form einer Kolbeneinheit und Verfahren zu deren Betrieb
CN113441626A (zh) * 2021-06-24 2021-09-28 枣庄海联金汇汽车装备有限公司 一种高强板板冲压扭力梁的二次拉延模具

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2715431A (en) * 1952-10-24 1955-08-16 Lombard Corp Combined tensioning and twisting apparatus for straightening extruded shapes
US2908316A (en) * 1957-01-08 1959-10-13 Baldwin Lima Hamilton Corp Compact stretch-straightening mechanism with gripping heads having separate upper and lower sections composed of vertical laminations
US3172528A (en) * 1962-12-11 1965-03-09 Kaiser Aluminium Chem Corp Apparatus for stretching metal plate
US3349598A (en) * 1965-05-24 1967-10-31 Baldwin Lima Hamilton Corp Plate stretcher
US3475943A (en) * 1966-09-29 1969-11-04 Schloemann Ag Stretching machines
US3595057A (en) * 1969-04-15 1971-07-27 Cyril Bath Co Stretcher for stretch forming sheet and plate stock

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2715431A (en) * 1952-10-24 1955-08-16 Lombard Corp Combined tensioning and twisting apparatus for straightening extruded shapes
US2908316A (en) * 1957-01-08 1959-10-13 Baldwin Lima Hamilton Corp Compact stretch-straightening mechanism with gripping heads having separate upper and lower sections composed of vertical laminations
US3172528A (en) * 1962-12-11 1965-03-09 Kaiser Aluminium Chem Corp Apparatus for stretching metal plate
US3349598A (en) * 1965-05-24 1967-10-31 Baldwin Lima Hamilton Corp Plate stretcher
US3475943A (en) * 1966-09-29 1969-11-04 Schloemann Ag Stretching machines
US3595057A (en) * 1969-04-15 1971-07-27 Cyril Bath Co Stretcher for stretch forming sheet and plate stock

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934439A (en) * 1973-04-07 1976-01-27 Gebr. Happich Gmbh Draw-bending apparatus and method
US4726212A (en) * 1985-03-11 1988-02-23 Unimetal Machine for straightening and stress-relieving steel rails
US4751838A (en) * 1985-11-18 1988-06-21 Red Bud Industries, Inc. Machine and process for leveling sheet metal strip
US4827753A (en) * 1987-01-20 1989-05-09 The Cyril Bath Company Extrusion former with three-way powered movement
CN102527776A (zh) * 2012-01-09 2012-07-04 温州久一重工有限公司 张力矫直机
CN102527776B (zh) * 2012-01-09 2014-01-22 温州久一重工有限公司 张力矫直机
CN116116935A (zh) * 2023-04-19 2023-05-16 西安朴复信息科技有限公司 一种用于铝型材加工的拉直装置及其加工工艺
CN116116935B (zh) * 2023-04-19 2023-10-20 湖南国宗铝业有限公司 一种用于铝型材加工的拉直装置及其加工工艺

Also Published As

Publication number Publication date
DE2117104B2 (de) 1980-04-03
DE2117104C3 (de) 1980-11-27
IT951149B (it) 1973-06-30
FR2132757B1 (it) 1975-06-20
GB1373282A (en) 1974-11-06
JPS5222342B1 (it) 1977-06-16
FR2132757A1 (it) 1972-11-24
DE2117104A1 (de) 1972-10-12

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