US3559439A - Arrangement for shaping of profiled curved workpieces from blanks - Google Patents

Arrangement for shaping of profiled curved workpieces from blanks Download PDF

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Publication number
US3559439A
US3559439A US796785A US3559439DA US3559439A US 3559439 A US3559439 A US 3559439A US 796785 A US796785 A US 796785A US 3559439D A US3559439D A US 3559439DA US 3559439 A US3559439 A US 3559439A
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United States
Prior art keywords
blanks
curvature
die
arrangement
shaping
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Expired - Lifetime
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US796785A
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English (en)
Inventor
Miloslav Zak
Milan Sekanina
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VYZK USTAV TVARECICH STROJU TE
VYZKUMNY USTAV TVARECICH STROJU TECHNOLOGIE TVARENI
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VYZK USTAV TVARECICH STROJU TE
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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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
    • B21D7/028—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member and altering the profile at the same time, e.g. forming bumpers
    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/04—Bending rods, profiles, or tubes over a movably-arranged forming menber

Definitions

  • the pressure rollers are arranged on a thrust head supported by an auxiliary frame, arranged pivotally with respect to the main frame of the machine so as to shape in the course of its angular movement parts of the workpiece having larger radii of curvature, while the dies are maintained in a stable position.
  • Parts of the workpiece having smaller radii of curvature are shaped by imparting to the support of said die a rotating movement around an axis substantially coincident with the centres of curvature of said part while the housing of pressure rollers acting on said part remains substantially stable.
  • Object of the present invention is an arrangement for shaping profiled curved blanks by wrapping them progressively by means of profiled rollers onto a shaped die and its aim is to realize a conguration, which comprises successive curves of various radii of curvature or of various combinations of successive straight sections and curves.
  • profiled blanks are bent on special forming machines of which several types are known.
  • the common feature of these machines is that the worktable on which is clamped a die of oval, rectangular or irregular form with rounded edges, is rotatable around an axis, which is situated between the profile to be bent and its center of curvature. Moreover this axis is situated in the plane of symmetry of this curvature at a distance, which is less than half the length of the finished part.
  • the profile rollers or a profile bar are, during forming, pressed onto thel surface of the die on which is clamped the initial profile blank.
  • the profile rollers are pressed mechanically, pneumatically or hydraulically.
  • bending machines are known having a rotary table in which is built another sliding table with a die mounted on it.
  • the known machines of this type are provided by a device for positive pivoting of the profile roller holder.
  • This arrangement has a drawback ice g in that the device has one more mechanism and besides this the profile rollers cause an acceleration of the motion of the rotary die.
  • the device In order to eliminate the acceleration of the die rotation it is necessary to provide in hydraulically driven machines a relatively complex control means in the pressure fluid distribution system.
  • a further drawback of known machines consists in that the considerable difference between the radius of rotation at the start of bending and at the end of bending requires a long stroke of the thrust mechanism. Therefore when using a hydraulic system for forcing the rollers against the workpiece a large amount of pressure fluid must be expelled from the pressure cylinder and the stroke of both piston and crosshead pin is excessive, which affects adversely lthe size of the pumps, lengths of guidings of the crosshead, the cooling system and thus also the overall dimensions of the machine.
  • -It is another object of this invention to provide the most favourable distribution of forces acting on the blank in the course of the operation.
  • the arrangement for shaping of workpieces from blanks operates in that the initial blank is clamped to a die and by means of profiled rollers arranged on a thrust head supported by an auxiliary frame, arranged pivotably with respect to the main frame of the machine, parts of the workpiece having larger radii of curvature are shaped in the course of an angular movement of said auxiliary frame, while the die remains stable. Parts of the workpiece with small radii of curvature are subsequently shaped by imparting to the support of the die an angular movement around an axis, substantially coincident with the centres of curvature of said part of the workpiece, while the housing of pressure rollers remains substantially stable.
  • the auxiliary frame is for this purpose arranged with respect to the main frame pivotally around an axis, spaced from the pressure rollers in operating position by at least one half of the length of the finished workpiece.
  • FIG. 1 is an elevation of a shaping machine in a partly FIG. 7 is another example of mounting roller housings to the thrust head.
  • a pivotable auxiliary frame 3 In the forward portion of the main frame 1 is mounted rotatably on a horizontal cylindrical main pin 2 a pivotable auxiliary frame 3. In the upper portion of this pivotable auxiliary frame 3 are guided, by means of adjustable guide gibs 4 (see FIG. 5) and inserted braces 5, two sliding blocks 6 forming hydraulic cylinders 7 with pipe lines 701 and 702 for the supply and release of pressure iiuid.
  • the pistons 8 with the respective sealing packings are fastened on piston rods 9 which are fixed to the pivotable auxiliary frame 3 by suspension pins 10.
  • In the bottom portion of the sliding blocks 6 In the bottom portion of the sliding blocks 6 are mounted pivotably on pins 11 two-piece housings 12 of profile rollers 19 comprising a top portion 13 and a bottom portion 14 assembled by bolts 15.
  • lateral openings in the top portion 13 of the housings 12 pass adjustment spindles 16 with collars 17, the spindles engaging by a thread into the lateral walls 18 of the bottom portion 14 of the housings 12.
  • the adjusting spindles 16 adjust a suitable distribution of forces of the hydraulic cylinders 7 onto the various profile rollers 19 which are mounted rotatably on axles 45 (see FIG. 6) in a recess in the bottom portion 14 of the housing 12.
  • axles 45 see FIG. 6 is shown a section through the housing 12 in a plane going through a not illustrated axis of the axle 45.
  • the pivotable auxiliary frame 3 is provided on one side with brackets 20 for a link pin 21 receiving an eye 22 of a piston rod 23 of the hydraulic cylinder 24 mounted pivotably on a second link pin 25 fixed in the main frame 1 of the device.
  • Pipe lines 241 and 242 supply and release pressure fluid from said cylinder 24.
  • brackets 26 and 27 In the opposite portion of the frame 1 are arranged brackets 26 and 27 in which are bored holes for receiving the die pin 28. On this pin are arranged pivotably bolsters 29 as one-arm levers on which are fixed the profile bending dies 30 proper. It is advantageous to mount at least two parallel bolsters 29 on said pin 28 in order to shape simultaneously at least two workpieces.
  • the form of the brackets 26, 27 of the bolsters 29 and the position of through holes on these elements are such that the die pin 28 is positioned near the center of the small radii of curvature of the round end of the profiled bending die 30.
  • the greatest length of the bolsters 29 and of the profile bending dies 30 must not exceed a definite limit which depends on the distance of main pin 2 of the pivotable arm 3 from the center of the active surface of the profile bending die 30. This distance must exceed the half length of the finished workpiece.
  • the bolsters 29 are connected to each other by a bolt 31 on which is slit also the eye 32 of the piston rod 33 actuated by a pivotable hydraulic cylinder 34 mounted on a stationary bolt 35. Pipe lines 341 and 342 supply and release pressure uid from said cylinder 34.
  • FIG. 7 A further example of realization of the housings 12 of profile rollers 19 is illustrated in FIG. 7.
  • the housing body is solid and in its bottom portion are inserted pins 45 supporting loosely rotatable profile rollers 19.
  • the relative radial spacing of the profile rollers 19 is thus invariable also in this embodiment.
  • the housings 12 are attached to the front part of the sliding blocks 6 by an eccentric pin 46, the central portion of which, having a much smaller diameter, is eccentric relative to its end portions. This arrangement permits first a pivotable movement of the housings 12 and by rotation of the crank pin 46 the distribution of thrust forces onto the various profile rollers 19 is altered.
  • the operator places the blanks 47, previously profiled, on the profile bending dies 30.
  • the double clamping jaw 38 actuated by the hydraulic clamping cylinder 36 firmly clamps two such blanks 47 to the bending dies 30.
  • the pivotable arm 3 is set into motion in direction of the arrow I by action of the hydraulic cylinder 24 and piston rod 23.
  • the housings 12 with profile rollers 19 swing moderately on pins 11 following the shape of the bending die 30. Because the center of curvature of the contour of the part 48 being formed is not positioned within the axis of rotation of the pivotable auxiliary frame 3 the profile rollers 19 recede together with the sliding blocks 6 movable in guide gibs 4.
  • auxiliary hydraulic cylinders 44 arranged in the top portion of the frame 1, rear of the opening 39, are set into operation. These cylinders 44 move away the blocks 41, on which rest in the first phase of operation the bolsters 29. The blocks 41 retract into recesses 39. Their movement is denoted by the arrow II in FIG. 4. This releases the bolsters 29 which then by action of the swingable hydraulic cylinders 34 rotate on the die pin 28 toward the baseplate of the frame 1 as shown in FIG. 1 by an arrow III.
  • the duration of overlap of the operating movements of the pivotable auxiliary frame 3 and bolsters 29 may be preset by a programme control system.
  • the whole cycle of the device is controlled for instance according a programme.
  • the operator loads and clamps the blanks, releases and unloads them after forming and by means of push-buttons puts the machine into operation.
  • An arrangement for shaping of profiled curved workpieces from blanks to a configuration with adjacent sections with diferent radii of curvature comprising:
  • a housing with pressure rollers joined to said thrust head said bolster being pivotably supported on said main frame about an axis substantially at the centers of curvature of the small radii of the shaped blank,
  • auxiliary frame being pivotably supported on said main frame about an axis spaced from the pressure rollers in operating position by at least one half of the length of the finished workpiece
  • said thrust head comprising a, hydraulic sliding cylinder, cooperating with a stable piston xed on said auxiliary frame.
  • An arrangement as set forth in claim 1 comprising holsters adapted for supporting a plurality of parallel bending dies.
  • An arrangement as set forth in claim 1 comprising means for adjusting the position of the pressure rollers to respect to said thrust head.
  • rollers comprising a housing composed of two parts, with means for adjustment of their relative position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US796785A 1968-02-10 1969-02-05 Arrangement for shaping of profiled curved workpieces from blanks Expired - Lifetime US3559439A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS103668 1968-02-10

Publications (1)

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US3559439A true US3559439A (en) 1971-02-02

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US796785A Expired - Lifetime US3559439A (en) 1968-02-10 1969-02-05 Arrangement for shaping of profiled curved workpieces from blanks

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US (1) US3559439A (enrdf_load_stackoverflow)
DE (1) DE1905809C3 (enrdf_load_stackoverflow)
FR (1) FR2001707A1 (enrdf_load_stackoverflow)
GB (1) GB1257672A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2221200A1 (en) * 1973-03-16 1974-10-11 Ponti Off Mec Omp Machine which press rolls curved sheet steel car bumpers - uses male former which is free to pivot w.r.t. press during operation
FR2338750A1 (fr) * 1976-01-26 1977-08-19 Dekoninck Michel Procede et machine de cintrage d'un profile longitudinal suivant un rayon de courbure variable
US4072040A (en) * 1976-08-05 1978-02-07 Bate & Ramey, Inc. Pile straightener
US20130283880A1 (en) * 2011-08-02 2013-10-31 Viswanathan Madhavan Universal dies of controllable curvature

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2203761C2 (ru) * 1999-11-16 2003-05-10 ООО Научно-внедренческая фирма "Интехнол" Устройство для изготовления атравматических игл

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2221200A1 (en) * 1973-03-16 1974-10-11 Ponti Off Mec Omp Machine which press rolls curved sheet steel car bumpers - uses male former which is free to pivot w.r.t. press during operation
FR2338750A1 (fr) * 1976-01-26 1977-08-19 Dekoninck Michel Procede et machine de cintrage d'un profile longitudinal suivant un rayon de courbure variable
US4072040A (en) * 1976-08-05 1978-02-07 Bate & Ramey, Inc. Pile straightener
US20130283880A1 (en) * 2011-08-02 2013-10-31 Viswanathan Madhavan Universal dies of controllable curvature
US9956600B2 (en) * 2011-08-02 2018-05-01 Fairmount Technologies, Llc Universal dies of controllable curvature

Also Published As

Publication number Publication date
DE1905809C3 (de) 1979-02-08
GB1257672A (enrdf_load_stackoverflow) 1971-12-22
FR2001707A1 (enrdf_load_stackoverflow) 1969-09-26
DE1905809B2 (de) 1978-06-08
DE1905809A1 (de) 1969-11-27

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