EP0921874A1 - Presse a cintrer amelioree, notamment dans le travail des metaux - Google Patents
Presse a cintrer amelioree, notamment dans le travail des metauxInfo
- Publication number
- EP0921874A1 EP0921874A1 EP97935746A EP97935746A EP0921874A1 EP 0921874 A1 EP0921874 A1 EP 0921874A1 EP 97935746 A EP97935746 A EP 97935746A EP 97935746 A EP97935746 A EP 97935746A EP 0921874 A1 EP0921874 A1 EP 0921874A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressing machine
- crosspiece
- jacket
- shoulder
- heads
- 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.)
- Granted
Links
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
- 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 cylinder 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. 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. In the solution just described some drawbacks are noticeable. These are above all related to the fact of having to associate each cylinder group to the frame of the machine.
- a third aspect 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.
- Regarding the noticeable advantages in the guide solution of the crosspiece with two points for each side there is no doubt that there is a perfect perpendicularity in the descent of the tool-carrier crosspiece, along the vertical axis Y-Y', maintaining protracted in time such characteristics, with the elimination of a good part of the maintenance and stop costs caused by the moments of pause for interventions on the pressing machine.
- 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 1 ), 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)
Abstract
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 true EP0921874A1 (fr) | 1999-06-16 |
EP0921874B1 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)
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 |
-
1996
- 1996-07-26 IT IT96TV000098A patent/IT1288646B1/it active IP Right Grant
-
1997
- 1997-07-23 CN CN97196771.7A patent/CN1226192A/zh active Pending
- 1997-07-23 JP JP10508669A patent/JP2000515814A/ja active Pending
- 1997-07-23 WO PCT/IT1997/000182 patent/WO1998004368A1/fr active IP Right Grant
- 1997-07-23 DE DE69701315T patent/DE69701315D1/de not_active Expired - Lifetime
- 1997-07-23 AT AT97935746T patent/ATE189780T1/de active
- 1997-07-23 EP EP97935746A patent/EP0921874B1/fr not_active Expired - Lifetime
- 1997-07-25 AR ARP970103397A patent/AR008009A1/es unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9804368A1 * |
Also Published As
Publication number | Publication date |
---|---|
ITTV960098A1 (it) | 1998-01-26 |
AR008009A1 (es) | 1999-11-24 |
EP0921874B1 (fr) | 2000-02-16 |
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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