US3910088A - Machine for straightening of round bars or tubes - Google Patents

Machine for straightening of round bars or tubes Download PDF

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Publication number
US3910088A
US3910088A US515712A US51571274A US3910088A US 3910088 A US3910088 A US 3910088A US 515712 A US515712 A US 515712A US 51571274 A US51571274 A US 51571274A US 3910088 A US3910088 A US 3910088A
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Prior art keywords
shaft
rolls
workpiece
straightening
combination
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US515712A
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English (en)
Inventor
Horst Lorenz
Gunter Gerhardt
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TH Kieserling and Albrecht GmbH and Co
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TH Kieserling and Albrecht GmbH and Co
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Priority claimed from DE19732352281 external-priority patent/DE2352281C3/de
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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
    • 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

  • Each unit has two lower straightening rolls and an upper straightening roll movable between an extended position in which it cooperates with the other rolls of the same unit to straighten a workpiece and a retracted position in which a fresh workpiece can be inserted or a treated workpiece removed.
  • All upper rolls are movable in a synchronism with each other in response to rotation of a crankshaft which is mounted in the frame of the machine and transmits motion to the upper rolls through the medium of double cranks and connecting rods.
  • the crankshaft is rotatable by a drive which has a gear secured to an intermediate portion of the crankshaft and a fluid-operated motor or a set of pulleys for rotating the gear through the medium of one or more additional gears.
  • the crankshaft further serves to raise and lower the upper sections of tubular guides in which the workpiece is confined between neighboring straightening units during treatment by the rolls.
  • the upper sections are lifted simultaneously with the upper rolls'to allow for unimpeded insertion of fresh workpieces and removal of straightened workpieces.
  • a further shaft can adjust the positions of upper rolls independently of the crankshaft so that the units can receive workpieces having larger or smaller diameters.
  • FIGA A first figure.
  • the present invention relates to improvements in machines for straightening elongated workpieces having a circular outline. More particularly, the invention relates to improvements in machines which are especially suited for the straightening of very long round tubes or bars. Still more particularly, the invention relates to improvements in means for moving selected straightening rolls of a straightening machine into and from engagement with elongated workpieces for the purpose of cooperating with other rolls to straighten a freshly introduced workpiece as well for the purpose of enabling the machine to treat workpieces having different outer diameters.
  • the workpieces which are to be treated are fed into and removed from the machine by moving axially. This is desirable and practical in connection with the treatment of relatively short workpieces; however, the overall length of the machine increases considerably if the workpieces to be treated are very long.
  • a machine into which the workpieces are being fed by moving sideways can complete the treatment of a relatively long workpiece within a much shorter interval of time than a machine into and through which the workpieces are fed by moving axially. Furthermore such machine is less likely to be damaged due to excessive swaying of the trailing end of a curved workpiece during combined angular and axial movement through the machine. This will be readily understood since the curvature of a fresh workpiece is reduced considerably as soon as it is properly engaged by the straightening rolls of two or more groups of rolls.
  • a drawback of presently known straightening machines of the just outlined character is that the introduction of fresh workpieces and the removal of straightenend workpieces take up too much time so that the output of such machines is unsatisfactory in spite of the fact that the necessary axial movement of a workpiece during straightening is only a small fraction of the overall length of the workpiece.
  • at least one roll of each group of straightening rolls must be moved away from the other rolls of the respective group so as to provide room for introduction of the fresh workpiece. The same operation must be repeated prior to removal of a straightened workpiece and the movable roll or rolls of each group must remain in their retracted positions during subsequent introduction of the next-following untreated workpiece.
  • An object of the invention is to provide a novel and improved machine for the straightening of rod-shaped or tubular workpieces having a circular outline, particularly for straightening of relatively long and bulky workpieces which are fed into and removed from the machine by moving sideways.
  • Another object of the invention is to provide the machine with novel and improved means for synchronizing the movements of those straightening rolls which must be retracted prior to introduction of a fresh metallic workpiece as well as prior to removal of a straightened metallic workpiece.
  • a further object of the invention is to provide novel and improved means for actuating sections of guide means in which the workpieces rotate during axial movement as a result of rotation by the straightening rolls.
  • the invention is embodied in a straightening machine for elongated tubular or bar-shaped workpieces, especially for very long workpieces having a circular outline.
  • the machine comprises an elongated frame, a row of straightening units which are mounted in the frame and each of which comprises a group of straightening rolls at least one of which is movable between an extended position of engagement with a freshly introduced workpiece and a retracted position in which a workpiece is insertable into or removable from the units, and novel means for moving the movable rolls in exact synchronism with each other.
  • the means for moving the moveable rolls comprises a single shaft in (preferably a crank-shaft) which is rotatably mounted in and extends lengthwise of the frame, and means for displacing the movable rolls through identical distances in response to rotation of the shaft.
  • the machine further comprises drive means for rotating the shaft, and such drive means has an output element (e.g., a gear) which is preferably connected to an intermediate portion of the shaft, most preferably substantially midway between the ends of the shaft.
  • the drive means may comprise a fluid-operated motor and a power train which connects the motor with the shaft, and such power train includes the aforementioned output element.
  • the power train may constitute a transmission.
  • the drive means for the shaft may comprise one or more pulleys which are mounted on a second shaft and are connected thereto by discrete couplings, and a power train which connects the second shaft with the first mentioned shaft and includes the aforementioned output element.
  • drive means may further comprise one or more brakes for arresting the second shaft in selected angular positions.
  • FIG. 1 is an elevational view of a straightening machine which embodies one form of the invention
  • FIG. 2 is an enlarged partly vertical sectional view of the first straightening unit in the machine of FIG. 1;
  • FIG. 3 is an enlarged sectional view as seen in the direction of arrows from the line III-III of FIG. 1;
  • FIG. 4 is an enlarged sectional view as seen in the direction of arrows from the line IV-IV of FIG. 1;
  • FIG. 5 is a diagram showing various positions of the crank pin of one of the cranks on the crankshaft which effects movements of selected straightening rolls prior to introduction of fresh workpieces and prior to removal of straightened workpieces;
  • FIG. 6 is an enlarged fragmentary sectional view as seen in the direction of arrows from the line VI-VI of FIG. 1;
  • FIG. 7 is a sectional view as seen in the direction of arrows from the line VII-VII of FIG. 6;
  • FIG. 8 is a fragmentary sectional view, similar to that of FIG. 6, ofa straightening unit in a modified machine.
  • FIG. 9 is a horizontal sectional view as seen in the direction of arrows from the line IX-IX of FIG. 8.
  • FIG. 1 shows a straightening machine 1 for elongated tubular or solid bar-shaped or rod-shaped metallic workpieces 60 (FIG. 3) having a circular outline.
  • the machine 1 comprises an elongated frame la which is somewhat longer than the length of a workpiece 60 and supports four discrete straightening units 2, 3, 4, 5 which are equally spaced from each other, as considered in the longitudinal direction of the frame.
  • the length of a workpiece 60 which is to be treated in the machine 1 is equal to or approximates the distance between the left-hand frame member 6 and the last straightening unit 5. This renders it possible to move the rotating workpiece lengthwise during treatment whereby the finished workpiece 62 (FIG.
  • each of the four straightening units 2-5 treats a certain length of the workpiece 60 which is fed into the machine 1 by moving sideways from one side of the row of units 2-5 and which is removed from the machine by moving sideways away from the straightening rolls at the other side of the row of units 2-5.
  • each of the four straightening units 2-5 is preferably identical.
  • Each of these units comprises two lower straightening rolls 7, 9 and an upper straightening roll 8, 10, ll, 12 respectively.
  • the rolls 7-9 of the first straightening unit 2 treat that portion of a freshly introduced workpiece 60 which ini' tially extends between the frame member 6 and the unit 2; the rolls 7, 8, of the unit 3 treat that length of a workpiece which initially extends between the units 2 and 3; and so forth.
  • the rolls 7, 8, 12 of the last straightening unit 5 treat that length of a workpiece which initially extends between the units 4 and 5 and which is located between the unit 5 and frame member 6a before the straightening workpiece 62 is removed from the machine 1.
  • the upper straightening rolls 8, I0, ll, 12 are movable away from the lower rolls 7, 9 in the respective unit 2, 3, 4 or 5 in a novel way for the purpose of permitting introductin of fresh workpieces 60 and of removing finished (straightened) workpieces 62, as well as for the purpose of changing the dimensions of the passages between the rolls of the respective units so as to allow for the straightening of workpieces having different diameters.
  • the upper rolls 8, 10, l l and 12 are movable up prior to introduction of a fresh workpiece 60 or prior to removal of a straightened workpiece 62, and down prior to straightening of a freshly introduced workpiece 60.
  • the mechanism for effecting up-and-down movements of the rolls 8, 10, 11 and 12 for the purpose of changing the dimensions of the aforementioned passages comprises a single horizontal adjusting shaft 13 and means (including the parts 26, 27, 28 and 29 best shown in FIG. 6) for transmitting motion from the shaft 13 to the upper rolls 8, l0, 1 l and 12 in response to angular displacement of the shaft 13.
  • the mechanism for moving the upper rolls 8, 10, 11 and 12 up and down for the purpose of introducing fresh workpieces 60 and of removing straightened workpieces 62 comprises a single horizontal crankshaft 14 which is operatively connected with the upper rolls of the four straightening units 25.
  • the crankshaft 14 has four double cranks 14a, one for each of the upper straightening rolls 8, 10, 11 and 12, elongated rodshaped sections 14d which extend between the neighboring units 2, 3, 4, 5, and couplings 14c each of which separably but rigidly connects one end portion of a sec tion 14a to one of two stubs 14b of the adjacent double crank 14a.
  • the drive 15 for rotating the crankshaft 14 in order to lift or lower the straightening rolls 8, I0, 11 and I2 is preferably mounted somewhere adjacent to a median portion of the crankshaft. As shown in FIG. 1, such drive may be mounted at or close to the strightening unit 3.
  • Each of the units 2, 3, 4 and 5 is mounted on a substantially C-shaped frame member 42 of the machine 1 (see FIGS.
  • a finished workpiece 62 can be evacuated from the machine by a conveyor including a series of rollers 63 (one shown in FIG. 3). Such finished workpiece is first moved sideways to leave the units 25 and to descend onto the rollers 63 of the just mentioned conveyor, and thereupon begins to move lengthwise, either to storage or to a further processing station, not shown.
  • the drive 15 for the crankshaft 14 is shown in FIG. 6.
  • This drive comprises a fluidoperated motor here shown as a double-acting hydraulic cylinder 17 which is mounted in or on the frame member 42 for the strightening unit 3 and has a piston (not shown) connected with an upwardly extending piston rod 16.
  • the upper end portion of the piston rod 16 is articulately connected with a lever 18 by a pin 16a, and the lever 18 can turn about the axis of a horizontal pivot member 20 which is mounted in the frame member 42.
  • the lever 18 is rigid with a gear 119, here shown as a segment, which is in mesh with an output element or a gear 21 on a stub 14b of the crankshaft 14.
  • the ratio of the power train or transmission including the gears 19, 21 and/or the length of strokes of the piston rod 16 can be readily selected in such a way that the double cranks 14a of the crankshaft 14 can lift the respective straightening rolls 8, 10, 11, 12 to a level which is needed for unimpeded introduction of fresh workpieces 60 and/or for unimpeded removal of finishes workpieces 62.
  • the chambers of the cylinder 17 receive or discharge fluid by way of conduits 23 and 24..
  • FIG. 6 further shows a valve 22 which is installed in the conduit 24 and serves to admit metered quantities of pressurized hydraulic fluid into the upper chamber of the cylinder 17, to permit evacuation of metered quantities of fluid from the upper chamber, or to seal the upper chamber from the source of pressurized fluid and from the tank.
  • the valve 22 may be controlled by a programming device of any known design which is not shown in the drawing.
  • a similar valve may be installed is not shown in the drawing.
  • a similar valve may be installed in the conduit 23 to control the flow of fluid into and from the
  • each double crank 14a is surrounded by the strap of a connecting rod or displacing means 64 which is aritculately connected to the upper end portion of a reciprocable pushpull rod 25.
  • the lower end portion of the rod 25 carries an inverted U-shaped bearing member 41 for the respective upper straightening roll 8, 10, 11 or 12.
  • Each rod 25 is guided for vertical movement in the respective frame member 42.
  • the aforementioned adjusting shaft 13 can adjust the level of upper straightening rolls 8, 10, 11 and 12 independently of the crankshaft 14 in a manner as shown in FIGS. 2 and 6.
  • the shaft 13 carries bevel gears 26, one for each of the units 2-5, which mate with bevel gears 27.
  • Each bevel gear 27 forms part of a gear cluster which further includes a spur gear 28 in mesh with a much longer spur gear 29 on the upper portion 65 of the respective rod 25.
  • the lower end portion of each upper portions 65 constitutes a feed screw which meshes with a spindle nut of the lower portion of the respective rod 25.
  • the lower portion of the rod 25 is held against rotation with respect to the corresponding member membeer 42 so that, when the shaft 13 is rotated to rotate the respective gear 29, the lower portion of the rod 25 and the corresponding bearing member 41 simply move up or down to thereby change the dimensions of the passage for a workpiece 60.
  • the upper portion 65 of the rod 25 is held against axial movement by the corresponding connecting rod 64.
  • the axial length of each gear 29 is sufficient to insure that this gear remains in mesh with the associated gear 28 when the rod 25 is moved up or down in response to angular displacement of the crankshaft 14.
  • FIGS. 8 and 9 illustrate a modified drive 115 for the crankshaft 14.
  • the frame member 42 of the machine which embodies the drive 115 supports a horizontal shaft 35 which is keyed to a gear 37. The latter can rotate an output element or gear 39 on the adjacent portion of the crankshaft 14 by way of an intermediate gear 38.
  • Each of the gears 37, 38, 30 may be a twin gear (see FIG. 9).
  • the shaft 35 supports two pulleys 30, 31 each of which has several peripheral-grooves for V- belts 32, 33.
  • the belts 32, 33 are respectively driven by additional pulleys (not shown) which receive torque from a prime mover, e. g., an electric motor which can rotate the pulleys 30, 31 through angles of preselected magnitude.
  • a prime mover e. g., an electric motor which can rotate the pulleys 30, 31 through angles of preselected magnitude.
  • the pulley 31 can rotate the shaft 35 through the medium of a disk-shaped coupling member 43 which is keyed to one end portion of the shaft 35 (see FIG. 9), whereby the shaft 35 rotates the gear 37.
  • the reference character 40 denotes in FIG. 8 a push-pull rod which is a functional equivalent of the aforedescribed rods 25.
  • the transmission ratio of gears 37, 38, 39 is selected with a view to insure that the upper straightening rolls 8, 10, 11 and 12 are lifted simultaneously through a predetermined distance in response to a predetermined angular displacement of the shaft 35 from a starting position in which the rolls 8, 10, 11 and 12 are nearest to the corresponding rolls 7, 9 and cooperate therewith to straighten a section of a freshly introduced workpiece 60.
  • the pulley 30 is drivingly connected with the shaft 35 by a second coupling member 34 which is axially movable therewith so as to move a ring-shaped lining 30a of the pulley 30 into frictional engagement with a brake disk 36 on the frame member 42'.
  • the shaft 35 can be arrested in a predetermined angular position by the simple expedient of moving the coupling member 34, pulley 30 and lining 30a in a direction toward the stationary brake disk 36.
  • the pins of all double cranks 14a preferably assume their lowermost positions (see FIG. 8).
  • the pulley 30 In lifting the rods 40 and the corresponding upper rolls 8, 10, ll, 12 above and away from a straightened workpiece 62, the pulley 30 preferably alternates with the pulley 31 in transmitting torque to the crankshaft 14. It is preferred to drive the pulley 30 or the pulleys 30, 31 by an electric motor through the medium of an infinitely variable-speed transmission to thus properly control the disengagement of vertically movable rolls 8, l0, 1 l, 12 within the all-important stage of transition from plastic deformation to elastic deformation of the material of the workpiece. Such transition must be gradual and uniform for all of the workpiece portions which are engaged by the straightening rolls.
  • the motor and transmission may be of conventional design.
  • the pulley 31 preferably further serves as a flywheel.
  • the rate at which the rolls 8, 10, 11, 12 are moved downwardly into engagement with a fresh workpiece 60 is of no particular importance because the duration of a straightening action is sufficient to insure repeated flexing of a rotating workpiece during lengthwise movement from the frame member 6 toward the frame member 6a so that the rolls of the units 25 have ample opportunity to straighten the workpiece by flexing it beyond the elastic limit (when necessary) while the workpiece moves lengthwise.
  • the initial lifting of rolls 8, l0, l1 and 12 upon completion of a straightening operation should be gradual and rather slow so that the workpiece 62 can complete several (e.g., three or four) revolutions about its axis while the rolls 8, 10, 11 and 12 rise above and away from the associated rolls 7,9.
  • the length of the interval which is required to move a crank pin from the position 45 to the position 46 of FIG. 5 is variable because it depends from the diameter of a workpiece 62 (such diameter determines the number of rotations of a workpiece about its own axis per unit of time). Another factor which determines the length of the interval which elapses during movement of a crank pin from the position 45 to the position 46 of FIG. 5' is the speed at which the workpiece moves lengthwise, i.e., the overall length of the time which is alloted for the straightening of a workpiece.
  • the length of the interval which elapses during movement of a crank pin from the position 46 (when the respective roll 8, l0, 11 or 12 is disengaged from a straightened workpiece 62 or is sufiiciently lifted to cause a mere elastic deformation of such workpiece) to the position 44 and back to the position 45 (engagement with a fresh workpiece 60) depends on the nature of instrumentalities which are used to transfer a workpiece 62 from the four pairs of rolls 7, 9 onto the rollers 63 and to thereupon place a fresh workpiece 60 onto the four pairs of rolls 7, 9.
  • Such interval may be extremely short if the means for removing workpieces 62 and feeding workpieces 60 operates automatically and is driven by a high-speed prime mover.
  • FIGS. 1, 2, 4 and 7 further show tubuler guides which extend between the frame members 6, 6a and are interrupted in the region of each straightening unit.
  • Each of these guides has a semicylindrical upper section or shell 55a which must be lifted with the rolls 8, l0, 1 1, 12 prior to feeding of a workpiece and prior to removal of a workpiece 62.
  • the means for moving the sections 55a derives motion from the crankshaft 14.
  • the crankshaft 14 carries pairs of eccentric cams 54 having tracks 61 for roller followers 60 on straps 56 which are articulately connected to vertically reciprocable coupling bars 59 guided in rails 57 of the respective frame members 42.
  • the bars 59 reciprocate between pairs of rollers 58 in the respective rails 57 and their lower end portions are rigid with the corresponding sections 55a.
  • the lower sections of the guides 55 are mounted in the frame la.
  • the motor 17 exhibits the advantage that it can change the angular position of the crankshaft 14 with a high degree of accuracy. Moreover, its controls are simple, rugged and reliable. Such motor will be used when the machine comprises one or more additional fluid-operated components so that the provision of a source of pressurized fluid is not necessary solely for the purpose of operating the motor 17.
  • the valve 22 insures that the movements of rolls 8, 10, l l and 12 between their extended and retracted positions can be regulated with a high degree of accuracy and reproducibility, and that the speed of these rolls can be changed during any selected stage of movement between extended and retracted positions.
  • the rolls 8, 10, 11, 12 can be rapidly moved to their extended or operative positions as well as during the last stage of movement to retracted positions (i.e., subsequent to disengagement from a straightened workpiece 62).
  • the movements of rolls 8, 10, 11, 12 during the initial stage of travel from extended positions must be regulated with a high degree of accuracy; for example, the valve 22 of FIG. 6 can be operated by a suitable electronic control unit including a relay 22a. This insures a gradual disengagement of rolls 8, 10, ll, 12 from a straigtened workpiece 62 during the critical stage of aforementioned transition from plastic to elastic deformation.
  • crankshaft 14 is capable of moving the rolls 8, 10, ll, 12 in exact synchronism with each other and that minor elastic deformations of the cranks 14a as a result of torsional stresses are of no consequence, especially if the crank pins of the cranks 14a are in their lower end positions while the rolls 8, 10, ll, 12 cooperate with the respective rolls 7, 9 to straighten a workpiece 60. Moreover, the torsional moment is practically zero when the crank pins assume their lower end positions (corresponding to the position 45 shown in FIG.
  • the means for rotating the rolls 7, 9 of each of the four units 25 is of conventional design and is not shown in the drawing.
  • the inclination of the axes of the rolls with respect to the axis of a workpiece 60 in the units 2-5 is such that the workpiece is compelled to rotate and to move axially in response to rotation of the rolls.
  • the placing ofthe output element 21 or 39 of the drive 15 or 115 substantially or exactly midway between the ends of the crankshaft 14 reduces the likelihood of twisting of the crankshaft when the piston rod 16 pivots the lever 18 or the pulleys 30, 31 rotate the shaft 35. This also contributes to more satisfactory synchronization of movements of upper rolls 8, 10, 11, 12 between extended and retracted positions and reduces in half the magnitude of torque which the crankshaft 14 must transmit in response to rotation by the motor 17 or pulleys 30, 31.
  • the pulley 30 and 31 rotates the shaft 35 at a relatively high speed during rapid movement of rolls 8, l0, l1, 12 to extended positions and during the second stage of movement of such rolls to retracted positions.
  • the pulley 31 or 30 then rotates the shaft 35 at an accurately controlled speed during the initial stage of movement of rolls 8, 10, l1 and 12 from extended positions, again for the purpose of insuring a gradual transition from plastic to elastic deformation of a workpiece 62. As mentioned before, such transition preferably takes place while the workpiece 62 completes several revolutions about its own axis.
  • FIGS. 8 and 9 The embodiment of FIGS. 8 and 9 is preferred when the machine does not comprise any parts which must be moved by fluid-operated motor means.
  • the pulleys 30, 31 are then driven by :a variable-speed electric motor or by a constant-speed motor through the medium of an infinitely variable-speed transmission.
  • the crankshaft 14 preferably completes one-half of a revolution in order to move the rolls 8, l0, 1 l, 12 to extended or operative positions, and one-half of a revolution to move these rolls to the retracted positions in which a workpiece or 62 can be fed into or removed from the units 2-5.
  • the crank pins preferably assume their upper end positions (44 in FIG. 5) in the fully retracted positions of the rolls 8, 10, 11, 12 and their lower end positions (45 in FIG. 5) in the fully extended positions of the rolls 8, 10, 11 and 12.
  • such mode of operation reduces the energy requirements of the motor 17 or of the motor means which drives the pulleys 30, 31.
  • a combination comprising an elongated frame; a row of straightening units mounted in said frame, each of said units including a group of straightening rolls, at least one roll of each of said groups being movable between an extended position of engagement with a workpiece: and a retracted position in which a workpiece is insertable into and removable from said units; and means for moving said movable roll between said positions thereof, including a single shaft rotably mounted in and extending lengthwise of said frame, and having a plurality of eccentric portions, one for each unit, connecting rod means between each of said eccentric portions and the movable roll of the respective unit, and drive means for rotating said single shaft through an angle so that said eccentric portions are in one of the dead center positions when said movable rolls are in their extended positions.
  • each of said connecting rod means comprises a pair of telescoping members, one member of each pair including a screw portion meshing with a spindle in the other member, means for holding said other member against rotation, and means for simultaneously rotating said one member of all connecting rod means and including a second shaft rotatably mounted in and extending lengthwise of said frame, a long spur gear fixedly mounted in said one member of each connecting rod means, a short spur gear for each long spur gear and meshing therewith and tumably mounted on said frame, and gear transmission means on said second shaft for simultaneously rotating all of said short spur gears upon rotation of said second shaft.
  • said drive means further comprises a second shaft, a power train connecting said second shaft with said intermediate portion of said first mentioned shaft, said power train including said output element, and means for rotating said second shaft including at least one pulley on said second shaft, coupling means connecting said pulley to said second shaft, and at least one belt for rotating said pulley.
  • said means for rotating said second shaft comprises two discrete pulleys on said second shaft, discrete couplings connecting said pulleys to said second shaft, and discrete belts for rotating said pulleys.
  • said drive meaans further comprises a fluid-operated motor and a power train connecting said motor with said intermediate portion of said shaft, said power train including said output element.
  • said drive further comprises means for metering the flow of a pressurized fluid to said motor.
  • said drive means for rotating said shaft including a gear transmission having a first gear rigid with said shaft and a second gear meshing with said first gear.
  • said means for moving said second sections comprises cams on said shaft and followers connected with said second sections and tracking said cams.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Wire Processing (AREA)
US515712A 1973-10-18 1974-10-17 Machine for straightening of round bars or tubes Expired - Lifetime US3910088A (en)

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Application Number Priority Date Filing Date Title
DE19732352281 DE2352281C3 (de) 1973-10-18 Richtanlage für Rohre

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US3910088A true US3910088A (en) 1975-10-07

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US515712A Expired - Lifetime US3910088A (en) 1973-10-18 1974-10-17 Machine for straightening of round bars or tubes

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US (1) US3910088A (fr)
JP (1) JPS542196B2 (fr)
CA (1) CA1024052A (fr)
DD (1) DD113702A1 (fr)
ES (1) ES430996A1 (fr)
FR (1) FR2248093B1 (fr)
GB (1) GB1461859A (fr)
HU (1) HU170713B (fr)
IT (1) IT1022882B (fr)
SU (1) SU561496A3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101412055B (zh) * 2008-10-28 2010-06-02 上海第二工业大学 一种利用金属管张力进行旋转矫直的方法
CN101890443A (zh) * 2010-07-05 2010-11-24 重庆拓润科技有限公司 一种排除轴上直线段的矫直方法
CN111475896A (zh) * 2020-04-14 2020-07-31 太原科技大学 一种棒材矫直应力中性层位置确定方法
CN114247776A (zh) * 2021-12-10 2022-03-29 大连德迈仕精密科技股份有限公司 一种电机轴制备用电机轴校直机构及使用方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1288426B1 (it) * 1997-01-23 1998-09-22 Demag Italimpianti Spa Macchina per il raddrizzamento di tubi e corpi astiformi in generale

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1382309A (en) * 1919-08-01 1921-06-21 James T Moltrup Straightening-machine
US3759077A (en) * 1970-10-17 1973-09-18 Kieserling & Albrecht Method and apparatus for feeding elongated rotary workpieces in straightening machines or the like

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1382309A (en) * 1919-08-01 1921-06-21 James T Moltrup Straightening-machine
US3759077A (en) * 1970-10-17 1973-09-18 Kieserling & Albrecht Method and apparatus for feeding elongated rotary workpieces in straightening machines or the like

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101412055B (zh) * 2008-10-28 2010-06-02 上海第二工业大学 一种利用金属管张力进行旋转矫直的方法
CN101890443A (zh) * 2010-07-05 2010-11-24 重庆拓润科技有限公司 一种排除轴上直线段的矫直方法
CN111475896A (zh) * 2020-04-14 2020-07-31 太原科技大学 一种棒材矫直应力中性层位置确定方法
CN111475896B (zh) * 2020-04-14 2023-04-21 太原科技大学 一种棒材矫直应力中性层位置确定方法
CN114247776A (zh) * 2021-12-10 2022-03-29 大连德迈仕精密科技股份有限公司 一种电机轴制备用电机轴校直机构及使用方法

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HU170713B (fr) 1977-08-28
JPS5067770A (fr) 1975-06-06
DD113702A1 (fr) 1975-06-20
GB1461859A (en) 1977-01-19
CA1024052A (fr) 1978-01-10
JPS542196B2 (fr) 1979-02-03
DE2352281B2 (de) 1977-06-08
ES430996A1 (es) 1976-10-16
DE2352281A1 (de) 1975-04-24
SU561496A3 (ru) 1977-06-05
FR2248093A1 (fr) 1975-05-16
FR2248093B1 (fr) 1976-12-31
IT1022882B (it) 1978-04-20

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