EP1224985A1 - A bending machine, in particular for sheet steel - Google Patents
A bending machine, in particular for sheet steel Download PDFInfo
- Publication number
- EP1224985A1 EP1224985A1 EP01830029A EP01830029A EP1224985A1 EP 1224985 A1 EP1224985 A1 EP 1224985A1 EP 01830029 A EP01830029 A EP 01830029A EP 01830029 A EP01830029 A EP 01830029A EP 1224985 A1 EP1224985 A1 EP 1224985A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- punch
- bending
- workpiece
- machine
- axis
- 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
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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
-
- 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
- B21D5/0209—Tools therefor
- B21D5/0263—Die with two oscillating halves
Definitions
- the invention is usefully applied for varying the longitudinal axis of a workpiece, for example sheet steel, by plastic deformation, to a predetermined angle and with the resultant fold having a relatively small curvature.
- the invention relates to a bending machine as described in the preamble to the first claim.
- a machine of this type already exists in the prior art, which plastically deforms the sheet steel to a dihedral axis and with a relatively small curvature in the angle in relation to the steel thickness.
- the bottom die is usually in the shape of a V-cavity, and the sheet of steel is placed on the edges of the die before the punch is brought into action, thrusting into the centre of the sheet until the latter adheres perfectly to the walls of the bottom die.
- the main aim of the present invention is to provide a machine which can overcome the above-described prior-art drawbacks and limitations.
- An advantage of the invention is that it is constructionally simple and economical.
- a further advantage is that the invention provides a machine which has a relatively low energy consumption.
- a further advantage is that friction on the steel is reduced during the bending operation.
- 1 denotes the punch of a bending machine for plastically deforming metal objects, in particular sheet steel, by means of bending against a bottom die.
- the punch 1 is operatively associated with a press, of known type and not illustrated, exerting a pressing action in the direction of a vertical axis x-x.
- the punch 1 exhibits a lower end 2, destined to contact the workpiece object to be bent; the punch lower end 2 has a rounded striker with an angle of curvature which roughly corresponds to the desired angle of curvature in the object after bending.
- the bending machine comprises a bottom die 3, which identifies at least one dihedral bending angle, against which the punch 1 presses a workpiece 4.
- the bottom die 3 is suitable for bending the workpiece 4 at the bottom end of the die 3, where the workpiece is pressed against the wall at the bottom of the die 3 and thus takes on the dihedral bending angle of the wall itself.
- the die 3 comprises idle means for interacting on contact with the workpiece 4 during the punch 1 pressing action.
- the idle means comprise four idle wheels 5, rotatably mounted on two opposite-facing skates 6, themselves rotatable about pivots 7 with parallel oscillation axes.
- the skates 6, which are rotatably coupled to a fixed frame 8, are situated on opposite sides of the axis x-x of the punch 1, and are symmetrically arranged with respect to a vertical plane passing through the axis x-x and parallel to the oscillation axes of the skates 6.
- Each skate 6 bears, on opposite sides with respect to the axis of oscillation thereof, two idle wheels 5.
- the axis of rotation of each wheel 5 is parallel to the axes of oscillation of the skates 6.
- the wheels 5 project from the skates 6 which support the wheels 5, so that the workpiece 4 can run on the wheels 5 during the bending stage.
- the bottom die 3 exhibits a mobile bottom wall, with variable and adjustable geometry.
- the bottom wall is described by the idle wheels 5 of the skates 6, and can assume at least two positions.
- the first of these positions (see figure 1) is a starting position in which the idle wheels 5 together form a rest plane, preferably horizontal and perpendicular to the axis x-x in which the punch operates.
- the workpiece 4 is positioned against the rest plane when in this position.
- the idle wheels 5 describe a dihedral angle into which the workpiece 4 has been pressed and plastically deformed.
- each skate 6 interacts contactingly with a stop 9 solidly fixed to the frame 8.
- the punch 1 is commanded by the press to descend towards the object 4 positioned on the bottom die 3, which latter is in the horizontal first position.
- the bending action begins, during which the lower side of the workpiece 4 interacts contactingly with the idle wheels 5 of the die 3. Thanks to the sliding rest afforded by the wheels 5, the parts of the object 4 in contact with the die 3, during the bending process, run against the die 3 with no dragging, and with very low friction.
- the friction generated is almost exclusively of the revolving type, with a practically total elimination of dragging friction.
- the machine is especially usable for bending sheet steel, but is advantageously applicable also in bending other plastically-deformable objects, of various shapes.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
- Specifically, though not exclusively, the invention is usefully applied for varying the longitudinal axis of a workpiece, for example sheet steel, by plastic deformation, to a predetermined angle and with the resultant fold having a relatively small curvature.
- In particular the invention relates to a bending machine as described in the preamble to the first claim.
- A machine of this type already exists in the prior art, which plastically deforms the sheet steel to a dihedral axis and with a relatively small curvature in the angle in relation to the steel thickness. The bottom die is usually in the shape of a V-cavity, and the sheet of steel is placed on the edges of the die before the punch is brought into action, thrusting into the centre of the sheet until the latter adheres perfectly to the walls of the bottom die.
- Machines of this type, however, exhibit some drawbacks.
- Firstly, they require forces of considerable size to bend the steel, with a consequently high energy consumption.
- Secondly, during the bending operation a high level of friction is created between the steel and the edges of the die, which can damage the sheet steel, leading to risks of scratching the steel surface and scoring in the part of the steel inside the die.
- The main aim of the present invention is to provide a machine which can overcome the above-described prior-art drawbacks and limitations.
- An advantage of the invention is that it is constructionally simple and economical.
- A further advantage is that the invention provides a machine which has a relatively low energy consumption.
- A further advantage is that friction on the steel is reduced during the bending operation.
- Further advantages are: especially delicate objects can be bent with no risk of damage; dragging of the material against the die during bending is reduced to a minimum, as is the risk of scratching; bend angle precision is improved; the perpendicularity of the punch is guaranteed with respect to the die during punch operation.
- These aims and advantages and more besides are all attained by the present invention, as it is characterised in the appended claims.
- Further characteristics and advantages of the invention will better emerge from the detailed description that follows of a preferred but non-exclusive embodiment of the invention, illustrated purely by way of non-limiting example in the accompanying figures of the drawings, in which:
- figure 1 is a schematic view in vertical elevation of a detail of the machine;
- figure 2 is the view of figure 1 in a different operational configuration.
-
- With reference to the figures of the drawings, 1 denotes the punch of a bending machine for plastically deforming metal objects, in particular sheet steel, by means of bending against a bottom die. The
punch 1 is operatively associated with a press, of known type and not illustrated, exerting a pressing action in the direction of a vertical axis x-x. Thepunch 1 exhibits alower end 2, destined to contact the workpiece object to be bent; the punchlower end 2 has a rounded striker with an angle of curvature which roughly corresponds to the desired angle of curvature in the object after bending. - The bending machine comprises a
bottom die 3, which identifies at least one dihedral bending angle, against which thepunch 1 presses aworkpiece 4. Thebottom die 3 is suitable for bending theworkpiece 4 at the bottom end of thedie 3, where the workpiece is pressed against the wall at the bottom of thedie 3 and thus takes on the dihedral bending angle of the wall itself. - The die 3 comprises idle means for interacting on contact with the
workpiece 4 during thepunch 1 pressing action. In the illustrated embodiment the idle means comprise fouridle wheels 5, rotatably mounted on two opposite-facingskates 6, themselves rotatable aboutpivots 7 with parallel oscillation axes. Theskates 6, which are rotatably coupled to afixed frame 8, are situated on opposite sides of the axis x-x of thepunch 1, and are symmetrically arranged with respect to a vertical plane passing through the axis x-x and parallel to the oscillation axes of theskates 6. Eachskate 6 bears, on opposite sides with respect to the axis of oscillation thereof, twoidle wheels 5. The axis of rotation of eachwheel 5 is parallel to the axes of oscillation of theskates 6. Thewheels 5 project from theskates 6 which support thewheels 5, so that theworkpiece 4 can run on thewheels 5 during the bending stage. - The bottom die 3 exhibits a mobile bottom wall, with variable and adjustable geometry. The bottom wall is described by the
idle wheels 5 of theskates 6, and can assume at least two positions. The first of these positions (see figure 1) is a starting position in which theidle wheels 5 together form a rest plane, preferably horizontal and perpendicular to the axis x-x in which the punch operates. Theworkpiece 4 is positioned against the rest plane when in this position. In the second of the positions (see figure 2), theidle wheels 5 describe a dihedral angle into which theworkpiece 4 has been pressed and plastically deformed. In the first position eachskate 6 interacts contactingly with astop 9 solidly fixed to theframe 8. - During operation the
punch 1 is commanded by the press to descend towards theobject 4 positioned on thebottom die 3, which latter is in the horizontal first position. When thepunch 1 meets the upper side of theworkpiece 4 the bending action begins, during which the lower side of theworkpiece 4 interacts contactingly with theidle wheels 5 of thedie 3. Thanks to the sliding rest afforded by thewheels 5, the parts of theobject 4 in contact with thedie 3, during the bending process, run against thedie 3 with no dragging, and with very low friction. The friction generated is almost exclusively of the revolving type, with a practically total elimination of dragging friction. - By virtue of this sliding-by-rolling effect, with no dragging means that the pressing force needed to bend the
workpiece 4 is considerably reduced, as is the risk of localized crumpling or stretching on theworkpiece 4 after the bending, as well as the risk of superficial damage (scratching, scoring and so on) on thebent workpiece 4. - It has been seen that using the bending machine of the invention considerable bend-angle precision can be achieved.
- The machine is especially usable for bending sheet steel, but is advantageously applicable also in bending other plastically-deformable objects, of various shapes.
Claims (4)
- A bending machine, comprising a bottom die (3) which describes at least one dihedral bending angle, and a punch (1) predisposed for pressing a workpiece (4) to be bent against the bottom die (3), characterised in that the bottom die (3) comprises idle means (5, 6) predisposed to interact contactingly with the workpiece (4) during a pressing action of the punch (1).
- The machine of claim 1, characterised in that the idle means (5, 6) comprise at least one idle wheel (5).
- The machine of claim 2, characterised in that the idle means (5, 6) comprise at least one skate (6) bearing, on opposite sides of an axis of oscillation of the skate (6), two idle wheels (5).
- The machine of claim 3, characterised in that the idle means comprise at least two skates (6) situated on either side of an axis of action (x-x) of the punch (1).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT01830029T ATE330728T1 (en) | 2001-01-19 | 2001-01-19 | BENDING MACHINE, ESPECIALLY FOR BENDING STEEL SHEET |
EP01830029A EP1224985B1 (en) | 2001-01-19 | 2001-01-19 | A bending machine, in particular for sheet steel |
DE60120895T DE60120895T2 (en) | 2001-01-19 | 2001-01-19 | Bending machine, in particular for bending steel sheets |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01830029A EP1224985B1 (en) | 2001-01-19 | 2001-01-19 | A bending machine, in particular for sheet steel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1224985A1 true EP1224985A1 (en) | 2002-07-24 |
EP1224985B1 EP1224985B1 (en) | 2006-06-21 |
Family
ID=8184362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01830029A Expired - Lifetime EP1224985B1 (en) | 2001-01-19 | 2001-01-19 | A bending machine, in particular for sheet steel |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1224985B1 (en) |
AT (1) | ATE330728T1 (en) |
DE (1) | DE60120895T2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2581145A1 (en) * | 2011-10-10 | 2013-04-17 | Invacare Corporation | Bending punch and die set |
CN107073860A (en) * | 2014-08-28 | 2017-08-18 | 戴维·布罗德赫德 | Punch die or drift for diel |
CN107138567A (en) * | 2017-07-18 | 2017-09-08 | 芜湖乾凯材料科技有限公司 | A kind of efficient numerically controlled bender |
CN108453157A (en) * | 2018-01-15 | 2018-08-28 | 江阴协圣精密科技有限公司 | A kind of Bending Mould and the automation bending equipment comprising it |
CN111842572A (en) * | 2020-08-03 | 2020-10-30 | 西安信康实业有限公司 | Section bending machine for manufacturing transformer oil tank |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3209576A (en) * | 1961-02-03 | 1965-10-05 | Promecan Sisson Lehmann | Die arrangement for a press |
JPS5910419A (en) * | 1982-07-09 | 1984-01-19 | Kawasaki Steel Corp | Attaching device of u-shaped press punch |
DE4316774A1 (en) * | 1993-05-19 | 1994-11-24 | Arno Werkle | Apparatus for bending sheet metal |
-
2001
- 2001-01-19 EP EP01830029A patent/EP1224985B1/en not_active Expired - Lifetime
- 2001-01-19 DE DE60120895T patent/DE60120895T2/en not_active Expired - Lifetime
- 2001-01-19 AT AT01830029T patent/ATE330728T1/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3209576A (en) * | 1961-02-03 | 1965-10-05 | Promecan Sisson Lehmann | Die arrangement for a press |
JPS5910419A (en) * | 1982-07-09 | 1984-01-19 | Kawasaki Steel Corp | Attaching device of u-shaped press punch |
DE4316774A1 (en) * | 1993-05-19 | 1994-11-24 | Arno Werkle | Apparatus for bending sheet metal |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 008, no. 096 (M - 294) 4 May 1984 (1984-05-04) * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2581145A1 (en) * | 2011-10-10 | 2013-04-17 | Invacare Corporation | Bending punch and die set |
CN107073860A (en) * | 2014-08-28 | 2017-08-18 | 戴维·布罗德赫德 | Punch die or drift for diel |
CN107138567A (en) * | 2017-07-18 | 2017-09-08 | 芜湖乾凯材料科技有限公司 | A kind of efficient numerically controlled bender |
CN108453157A (en) * | 2018-01-15 | 2018-08-28 | 江阴协圣精密科技有限公司 | A kind of Bending Mould and the automation bending equipment comprising it |
CN111842572A (en) * | 2020-08-03 | 2020-10-30 | 西安信康实业有限公司 | Section bending machine for manufacturing transformer oil tank |
Also Published As
Publication number | Publication date |
---|---|
DE60120895T2 (en) | 2007-01-18 |
ATE330728T1 (en) | 2006-07-15 |
DE60120895D1 (en) | 2006-08-03 |
EP1224985B1 (en) | 2006-06-21 |
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