EP0921874B1 - Presse a cintrer amelioree, notamment dans le travail des metaux - Google Patents

Presse a cintrer amelioree, notamment dans le travail des metaux Download PDF

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Publication number
EP0921874B1
EP0921874B1 EP97935746A EP97935746A EP0921874B1 EP 0921874 B1 EP0921874 B1 EP 0921874B1 EP 97935746 A EP97935746 A EP 97935746A EP 97935746 A EP97935746 A EP 97935746A EP 0921874 B1 EP0921874 B1 EP 0921874B1
Authority
EP
European Patent Office
Prior art keywords
jacket
pressing machine
crosspiece
shoulder
bending
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
EP97935746A
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German (de)
English (en)
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EP0921874A1 (fr
Inventor
Luciano Gasparini
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0921874A1 publication Critical patent/EP0921874A1/fr
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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means

Definitions

  • This invention has for object an improved bending pressing machine, particularly in metal working processes.
  • the innovation finds particular even if not exclusive application in the metal working industry.
  • a so called bending cycle consists essentially of the vertical descent of a tool until touching the underlying sheet foil, in carrying out the bending, and then, at the end, going back up to reach the starting position.
  • the machine is made up of two parts, respectively a first dynamic one, generally regarding the upper part, and a static part, making up the underside of the machine placed on the perpendicular of the dynamic part.
  • the tool made up of a blade differently formed also of the interchangeable type, exclusively effects a vertical to and fro movement on axis Y-Y', said movement being ensured by at least two oleodynamic cylinders of which one for each part, which determine the descent, the eventual stop, and the ascent of an upper crosspiece which longitudinally supports the tool.
  • each cylinder group of a traditional bending pressing machine is literally joined to the frame or static body of the machine, during the preassembly phase of same and in this particular case each with a corresponding side shoulder of the frame of the pressing machine, by using a series of robust screws.
  • the forces exerted by the pressing machine are high and innumerable, some of these concern by reflex mainly the cylinder-pressing machine connecting point, reason why it is considered a very critical part, which requires particular care in the realization.
  • the realization of a specular cavity on both surfaces is provided, respectively on one side of the shoulder and on the other on the jacket of the cylinder, in such a way to allow the housing of a spline or transversal key.
  • the structure of the cylinder it is a traditional one and includes a jacket engaged to the shoulder, of the type obtained by a casting of cast iron closed on the ends on one side by a sealing flange, on the other by a block provided with means for the feeding of the cylinder.
  • a jacket engaged to the shoulder of the type obtained by a casting of cast iron closed on the ends on one side by a sealing flange, on the other by a block provided with means for the feeding of the cylinder.
  • Coaxially to the jacket there is the known shaft, whose end, engages steadily one side of said crosspiece and which in turn supports the tool.
  • the crosspiece is presently of the type guided on both sides, a reciprocal, guide means being provided, which interferes with the same.
  • a guide is engaged on the top and perpendicularly, by screw means, provided on both sides with a surface with low friction coefficient, as for example a nylon interchangeable small block or other.
  • An object of this invention is that of avoiding the above-mentioned drawbacks.
  • a third advantage relates to the encumbrances, which are substantially reduced because of the small size of the cylinder, and of its integration in the machine body.
  • Another advantage, more properly of the cylinder relates to the fact that melting risks of the external jacket are avoided, while concerning the use of the internal jacket that is of the interchangeable type, it has a high maintenance simplicity in general. Such intervention simplicity is due also to the fact of involving the use of articles commonly available on the market, it results also a discreet flexibility in case in which is necessary to change the piston stroke.
  • Figure 1 represents a sectional longitudinal view of the cylinder group of which in Figure 2, seen along the axis X-X.
  • Figure 2. represents a plan-view of a cylinder group for bending pressing machines.
  • Figure 3 is a prospect of the upper crosspiece assembly, including on one side one cylinder group as well as some guiding means of said crosspiece.
  • Figure 4. represents a plan-view of the assembly shown in the previous Figure.
  • Figure 5. represents a sectional view on longitudinal level of a cylinder group and of the guides for bending pressing machines.
  • a bending pressing machine (A) consists of an upper and of a lower part, the first essentially dynamic with respect to the second static one.
  • An upper crosspiece (1) is part of the first one, vertically movable along the Y-Y' axis in respect to the frame (a) of the bending pressing machine, on whose lower end a tool (2) of the interchangeable type is provided associated longitudinally.
  • the body of the machine (A) provides on the ends, a cylinder group for each side, preferably of the double-action type, which determines the descent and vice versa movement along the Y-Y' axis, of the upper crosspiece (1).
  • Each cylinder group is essentially made up of two heads, respectively a higher one (3) and a lower one (4), which hold a first jacket, external, (5). Both said heads (3, 4) and the jacket (5), are steadily welded to the corresponding side shoulder (a') of the frame (a) of the pressing machine (A).
  • the first ones this is made possible by a specific shape of these same, providing besides the technical part for housing the ends of the jackets (5, 7) as well as the relative gaskets, an extension fork (3', 4'). These, have the same thickness as the corresponding heads (3, 4), and each one is disposed on both sides of said shoulder (a').
  • the upper side of the head (3) includes means (6, 6') for the joining to the feeding system, the underlying part realizes suitable seat jackets, a first external (5) and a second internal (7) or interchangeable liner, being coaxial to said first one.
  • the first jacket (5) is closed on one side by upper head (3), while on the other side by the lower head (4), both immovable, allowing the welding to the shoulder (a') also of said first jacket (5).
  • the second jacket, or internal liner (7) it can be noticed that it is of the interchangeable type. This is made possible by a flange (8), substantially removable from the lower head (4), thus making it possible to remove both the shaft (9) of the double-action cylinder, and the internal jacket (7).
  • a further characteristic, noticeable in the head (3) is the presence of a feeding duct (14), which communicates with an interspace (15) noticeable between the first jacket (5) and the second (7), said duct (14) by feeding means (6') having the function of allowing the return towards the top of the shaft (9).
  • At least one of said heads (3, 4) of the cylinder group, for each side of the pressing machine (A), in particular the lower head (4), provides, in this case orthogonal to the previous one, a second fork (10) (see. Fig. 4) which must guide the perpendicular movement of a side end of the upper crosspiece (1).
  • Said second guide fork (10) provides on the internal and opposed faces, the association of two interchangeable sliding blocks (11), with low frictional coefficient.
  • second guiding means include essentially a plate (12), orthogonally engaged in respect to the shoulder (a'), which supports on both sliding sides two sliding blocks (12') also with low frictional coefficient.
  • the section (13') of the gib (13) shaped like an "L" is superimposed, and which is associated by common screw means directly to the crosspiece (1).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Press Drives And Press Lines (AREA)

Claims (7)

  1. Un machine de pliage et de pression, en particulier pour le des procédés d'usinage de métaux, du type comprenant une épaule (a') qui soutient une enveloppe (7) qui loge un cylindre (9) avec traverse (1) qui à son tour soutient un outil de pliage qui est réciproque de façon dynamique (2); ladite enveloppe (7) étant logée de façon extractible dans une enveloppe cylindrique externe (5) soudée sur ladite épaule (a), et ayant une bride inférieure amovible (8); où latéralement à la traverse (1) de support dudit outil de pliage (2) il y a au moins deux points de guidage respectivement, un premier qui concerne la partie supérieure de la traverse (1) et un deuxième au-dessous du premier, le long de ladite traverse (1) dans une position intermédiaire;
    caractérisée en ce que ladite enveloppe cylindrique externe (5) pour le support de ladite enveloppe (7) inclut essentiellement deux têtes (3, 4), respectivement une inférieure et une supérieure, l'enveloppe externe (5) étant tenue entre lesdites têtes (3, 4), les têtes étant soudées latéralement à l'épaule (a') du châssis (a) de ladite machine à pression (A); la tête supérieure (3) présentant des moyens (6, 6') pour la connexion de moyens d'alimentation pour l'enveloppe (7), et la tête inférieure (4) soutient la bride amovible (8) pour permettre l'extraction de l'enveloppe interne interchangeable (7) dans laquelle ledit moyen de cylindre (9) est logé; l'enveloppe interne (7) étant tenu entre la tête supérieure (3) et la bride (8).
  2. Machine de pliage et de pression selon la revendication 1., caractérisée en ce que de part et d'autre de ladite traverse (1) de support de l'outil (2), il y a au moins deux points de guidage respectivement, un premier concernant la partie supérieure de la traverse (1) et un deuxième au-dessous du premier, le long de la traverse (1) dans une position intermédiaire; ledit premier moyen de guidage étant obtenu d'une forme à fourchette (10) obtenue d'une des deux têtes (4) qui forment le cylindre; tandis que de deuxièmes moyens sont obtenus en engageant à l'épaule (a') de la machine à pression (A), au-dessus et perpendiculairement, un guidage (12), auquel est superposée une partie d' un listel à rabattage de jeu (13), de sa part étant associée à l'extrémité correspondante de la traverse (1) qui transporteur l'outil.
  3. Machine de pliage et de pression selon les revendications 1, et 2., caractérisée en ce que chaque tête, respectivement celle supérieure (3) et celle inférieure (4), qui sont soudées à l'épaule latérale correspondante (a') du châssis (a) de la machine à pression (A), présente une fourchette d'extension (3', 4') qui embrasse les deux côtés de ladite épaule (a').
  4. Machine de pliage et de pression selon les revendications précédantes, caractérisée en ce que le côté supérieur de la tête supérieure (3) inclut des moyens (6, 6') pour l'accouplement au système d'alimentation, et que la partie inférieure réalise des logements pour loger les extrémités, par l'interposition de joints d'étanchéité appropriés, des enveloppes externe (5) et interne (7) coaxiales.
  5. Machine de pliage et de pression, selon les revendications précédantes, caractérisée en ce que l'enveloppe externe (5) est fermée d'un côté par la tête supérieure (3) et de l'autre côté par la tête inférieure (4), les deux immobiles, pour permettre le soudage de ladite enveloppe externe (5) à l'épaule (a').
  6. Machine de pliage et de pression, selon les revendications précédantes, caractérisée en ce que l'enveloppe interne (7) est du type interchangeable avec une bride (8), amovible, insérée dans la tête inférieure (4).
  7. Machine de pliage et de pression, selon les revendications précédantes, caractérisée en ce que dans la tête supérieure (3) il y a un tuyau d'alimentation (14), lequel communique avec un entre-deux (15) perceptible entre l'enveloppe externe (5) et l'enveloppe interne (7), ledit tuyau (14) étant connecté à quelques moyens d'alimentation (6').
EP97935746A 1996-07-26 1997-07-23 Presse a cintrer amelioree, notamment dans le travail des metaux Expired - Lifetime EP0921874B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT96TV000098A IT1288646B1 (it) 1996-07-26 1996-07-26 Macchina pressa piegatrice perfezionata, particolarmente nei processi di lavorazione del metallo.
ITTV960098 1996-07-26
PCT/IT1997/000182 WO1998004368A1 (fr) 1996-07-26 1997-07-23 Presse a cintrer amelioree, notamment dans le travail des metaux

Publications (2)

Publication Number Publication Date
EP0921874A1 EP0921874A1 (fr) 1999-06-16
EP0921874B1 true EP0921874B1 (fr) 2000-02-16

Family

ID=11419977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97935746A Expired - Lifetime EP0921874B1 (fr) 1996-07-26 1997-07-23 Presse a cintrer amelioree, notamment dans le travail des metaux

Country Status (8)

Country Link
EP (1) EP0921874B1 (fr)
JP (1) JP2000515814A (fr)
CN (1) CN1226192A (fr)
AR (1) AR008009A1 (fr)
AT (1) ATE189780T1 (fr)
DE (1) DE69701315D1 (fr)
IT (1) IT1288646B1 (fr)
WO (1) WO1998004368A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1812982A (en) * 1929-12-13 1931-07-07 Rafter Machine Company Machine for bending sheet metal shapes
FR1236985A (fr) * 1958-10-03 1960-07-22 Machine à plier les tôles, à éléments de guidage auxiliaires
GB1005114A (en) * 1963-08-09 1965-09-22 Steel Construction & Eng Co Improvements in or relating to hydraulically-operated press brakes or guillotines
US3282076A (en) * 1963-12-20 1966-11-01 Laval Turbine Brakes for forming plate or sheet workpieces
FR1517000A (fr) * 1967-01-31 1968-02-05 Perfectionnements aux vérins hydrauliques en vue, notamment, de leur application àdes presses ou machines analogues
DE2344432A1 (de) * 1972-10-06 1974-04-11 Verrina Spa Abkantpresse mit hydraulischem oberantrieb

Also Published As

Publication number Publication date
ITTV960098A1 (it) 1998-01-26
AR008009A1 (es) 1999-11-24
EP0921874A1 (fr) 1999-06-16
IT1288646B1 (it) 1998-09-23
WO1998004368A1 (fr) 1998-02-05
JP2000515814A (ja) 2000-11-28
CN1226192A (zh) 1999-08-18
ATE189780T1 (de) 2000-03-15
DE69701315D1 (de) 2000-03-23

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