EP0865840A1 - Adjustable die assembly - Google Patents
Adjustable die assembly Download PDFInfo
- Publication number
- EP0865840A1 EP0865840A1 EP97200800A EP97200800A EP0865840A1 EP 0865840 A1 EP0865840 A1 EP 0865840A1 EP 97200800 A EP97200800 A EP 97200800A EP 97200800 A EP97200800 A EP 97200800A EP 0865840 A1 EP0865840 A1 EP 0865840A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- die
- half die
- respect
- die body
- centre plane
- 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.)
- Withdrawn
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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
- B21D5/0209—Tools therefor
- B21D5/0227—Length adjustment of the die
-
- 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
Definitions
- the invention relates to a die assembly for sheet metal forming machines, such as edging or folding presses.
- the invention more specifically relates to the so called “lower tools" of such assembly and in particular to laterally adjustable die jaws, pads or abutments of such lower tools.
- Lower tools comprising displaceable jaws or pads so that the die width can be adjusted are for instance known from US patent 5,564,301.
- this lower tool assembly separate die halves are obliquely displaceable in an horizontal plane, symetrically with respect to the centre line of the die assembly.
- the die halves can be displaced with respect to each other by means of obliquely arranged slots and keys at the upper sliding surface of a base plate of the lower tool and at the lower sliding surfaces of the die halves.
- the features of this adjustable die assembly offer certain advantages over previously known adjustable dies, but still present a number of drawbacks from the point of view of construction complexity and cost, and from the point of view of operation easiness.
- the invention accordingly provides a die assembly for a sheet metal forming machine comprising a base plate and two half die bodies which are moveable with respect to each other to provide an adjustable die width between the jaws of said half die bodies, said half die bodies being each obliquely moveable with respect to the centre plane of the die assembly between said jaws, wherein a first half die body is arranged on the base plate, linearly moveable according to an angle alpha with respect to said centre plane, and a second half die body is arranged on said first half die body linearly moveable at an angle 2 times alpha with respect to said centre plane.
- the first and second die body and the base plate are provided with cooperating obliquely arranged keys and oblique slots.
- a movement of the first half die body in the longitudinal direction i.e. parallel to the centre plane of the die assembly
- a transversal movement i.e. a movement perpendicular to the centre plane of the die assembly, of the first half die body, and simultaneously also of the second half die body, but in opposite direction.
- the back half die body of the die assembly which is arranged on the base plate of the die assembly, whereas the front half die body is arranged on the back half die body.
- the upper surface of the base plate is provided with at least one oblique slot, lying at an angle alpha with respect to the centre plane of the die assembly, and the bottom surface of the first half die body (preferably the back die) is provided with one or more corresponding oblique slots also lying at an angle alpha with respect to the centre plane, whereas a number of keys provided in said slots allow an oblique movement of the first half die body (preferably the back die) with respect to the base plate;
- the upper surface of the first half die (preferably the back die) is provided with at least one oblique slot, lying at an angle 2 times alpha with respect to the centre plane, and the bottom surface of the second half die body (preferably the front die) is provided with one or more corresponding oblique slots also lying at an angle 2 times alpha with respect to the centre plane, whereas a number of keys provided in said slots allow an oblique movement of the first half die body (preferably the back die) with respect to the second half die body (preferably the front die).
- the die assembly may comprise means to move the first half die body along a longitudinal direction parallel to the centre plane of the die assembly, and means to retain the second half die body in fixed position in said longitudinal direction, so that a movement of the first half die body along said longitudinal direction results in a symetric movement of the two half die bodies with respect to each other in the transversal direction perpendicular to the centre plane of the die assembly.
- a movement of the first half die body (preferably the back die) in the longitudinal direction, i.e. parallel to the centre plane of the die assembly automatically results in a corresponding transversal movement, i.e. a movement perpendicular to the centre plane, of the first half die body (preferably the back die), and a simultaneous, symetric (i.e. in opposite direction) transversal movement of the second half die body (preferably the front die) over the same distance
- the particular construction according to the present invention makes it possible to avoid the inherent drawback of the known constructions according to which the oblique slots must necesserily entirely lie outside the broadest die width, automatically resulting in a die assembly with very broad half dies, at the front as well as at the back. At the front side this does not constitute so much a problem, but at the back side it prevents making Z-folds in the metal sheets.
- the width necessary for the oblique slots can lie entirely underneeth the die width. The back die can thus remain narrow so that making Z-folds in the metal sheets is not hindered.
- a further advantage of the new principle resides in the fact that only one half die has to be moved longitudinally. This is easier and cheaper to achieve than having to move both half dies. Additionally, according to the new principle, only the back die has to be extended for the length corresponding to the longitudinal movement of the die, whereas in the known construction both half dies have to be considerably longer than the folding length.
- the lower tool assembly for a sheet metal forming machine comprises a base plate (1) having an upper surface (13) supporting the lower surface (14) of a back half die body (2).
- the back half die body (2) has an upper surface (15) supporting the lower surface (16) of a front half die body (3).
- the upper surface (13) of the base plate(1) and the lower surface (14) of the back half die (2) are respectively provided with one oblique slot (9) and one oblique slot (8) - at an angle alpha with respect to the longitudinal direction of the lower tool assembly - cooperating with keys (7) to bring about a transverse movement of the back half body (2) with respect to the base plate (1) - i.e.
- the upper surface (15) of the back half die (2) and the lower surface (16) of the front half die (3) are respectively provided with one oblique slot (12) and one oblique slot (11) - at an angle 2 alpha with respect to the longitudinal direction of the lower tool assembly - cooperating with keys (10) to bring about a transverse movement of the front half body (2) with respect to the back half body (2) (and with respect to the base plate (1)) - i.e. a movement perpendicular to the centre plane (Y,Z) of the lower tool assembly - when a longitudinal movement - parallel to the centre plane (Y,Z)- is imparted to the back half die body (2).
- the width (4) between jaw (5) of the back half die body (2) and jaw (6) of the front half (3) die body can be adjusted by moving the back half die in the longitudinal direction, whereas the front half die body is maintained in place in the longitudinal direction.
- Cooperation of the slots and keys of the base plate and the half die bodies results in a simetric movement of the two half die bodies with respect to each other, namely a movement of the the back die body (2) perpendicular to the centre plane (Y,Z), and a simultaneous, symetric (i.e. in opposite direction) transversal movement of the front die body (3) over the same distance.
- Figures 3a, 3b and 4 illustrate another embodiment of the invention in which several parallel oblique slots - two in the present case - (11) and (11') are provided in the upper surface (15) of the back half die body (2), cooperating with several parallel keys - two in the present case - (10) and (10') provided to the lower surface (16) of the front half die body (3) - either directly or in corresponding slots in the front half die body (not represented)-.
- the width (4) between the jaws of the half die bodies (2) and (3) can be adjusted by moving the back half die in longitudinal direction, whereas the front half die body is maintained in place, in a similar way as explained above in respect of the embodiment of figures 1 - 2.
- FIG. 5 A representation of a lower tool assembly of the know type, as referred to hereabove in the discussion of the state of the art, is given in figure 5 to illustrate the more compact construction of a lower tool assembly according to the principle of the present invention.
- both the back half die (2) and the front half die (3) have to be sufficiently broad to accommodate the oblique slots which must necesserilly extend beside the entire die width. It is clear that the die assembly according to the invention presents a considerable advantage also from this point of view.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention relates to a die assembly for a
sheet metal forming machine comprising a base plate (1) and
two half die bodies (2,3) which are moveable with respect
to each other to provide an adjustable die width (4)
between jaws (5,6) borne by said half die bodies, said half
die bodies being each obliquely moveable with respect to
the centre plane (Y,Z) of the die assembly between said
jaws (5,6), wherein a first half die body (2) is arranged
on the base plate (1), linearly moveable according to an
angle alpha with respect to said centre plane (Y,Z), and
a second half die body (3) is arranged on said first half
die body (2) linearly moveable at an angle 2 times alpha
with respect to said centre plane (Y,Z).
The base plate (1) and the half die bodies (2,3), in particular the back die body (1) and front die body (3), may be provided with cooperating obliquely arranged keys (7,10) and oblique slots (8,9; 11,12) allowing an oblique movement of the first half die body (2) with respect to the base plate (1) and of the first half die body (2) with respect to the second half die body (3).
The base plate (1) and the half die bodies (2,3), in particular the back die body (1) and front die body (3), may be provided with cooperating obliquely arranged keys (7,10) and oblique slots (8,9; 11,12) allowing an oblique movement of the first half die body (2) with respect to the base plate (1) and of the first half die body (2) with respect to the second half die body (3).
Description
The invention relates to a die assembly for sheet
metal forming machines, such as edging or folding presses.
The invention more specifically relates to the so called
"lower tools" of such assembly and in particular to
laterally adjustable die jaws, pads or abutments of such
lower tools.
Lower tools comprising displaceable jaws or pads
so that the die width can be adjusted are for instance
known from US patent 5,564,301. In this lower tool assembly
separate die halves are obliquely displaceable in an
horizontal plane, symetrically with respect to the centre
line of the die assembly. The die halves can be displaced
with respect to each other by means of obliquely arranged
slots and keys at the upper sliding surface of a base plate
of the lower tool and at the lower sliding surfaces of the
die halves.
The features of this adjustable die assembly offer certain advantages over previously known adjustable dies, but still present a number of drawbacks from the point of view of construction complexity and cost, and from the point of view of operation easiness.
The features of this adjustable die assembly offer certain advantages over previously known adjustable dies, but still present a number of drawbacks from the point of view of construction complexity and cost, and from the point of view of operation easiness.
It is a purpose of the present invention to
overcome these drawbacks and to provide further
improvements with respect to the known adjustable die
assemblies for sheet metal forming machines, such as edging
or folding presses.
The invention accordingly provides a die assembly
for a sheet metal forming machine comprising a base plate
and two half die bodies which are moveable with respect to
each other to provide an adjustable die width between the
jaws of said half die bodies, said half die bodies being
each obliquely moveable with respect to the centre plane
of the die assembly between said jaws, wherein a first half
die body is arranged on the base plate, linearly moveable
according to an angle alpha with respect to said centre
plane, and a second half die body is arranged on said first
half die body linearly moveable at an angle 2 times alpha
with respect to said centre plane.
According to a preferred feature of the invention
the first and second die body and the base plate are
provided with cooperating obliquely arranged keys and
oblique slots.
By the arrangements thus defined, a movement of
the first half die body in the longitudinal direction, i.e.
parallel to the centre plane of the die assembly, can be
combined with a transversal movement, i.e. a movement
perpendicular to the centre plane of the die assembly, of
the first half die body, and simultaneously also of the
second half die body, but in opposite direction.
In a specific embodiment of the invention, it is
more in particular the back half die body of the die
assembly which is arranged on the base plate of the die
assembly, whereas the front half die body is arranged on
the back half die body.
According to further preferred features of the
invention, the upper surface of the base plate is provided
with at least one oblique slot, lying at an angle alpha
with respect to the centre plane of the die assembly, and
the bottom surface of the first half die body (preferably
the back die) is provided with one or more corresponding
oblique slots also lying at an angle alpha with respect to
the centre plane, whereas a number of keys provided in said
slots allow an oblique movement of the first half die body
(preferably the back die) with respect to the base plate;
the upper surface of the first half die (preferably the
back die) is provided with at least one oblique slot, lying
at an angle 2 times alpha with respect to the centre plane,
and the bottom surface of the second half die body
(preferably the front die) is provided with one or more
corresponding oblique slots also lying at an angle 2 times
alpha with respect to the centre plane, whereas a number
of keys provided in said slots allow an oblique movement
of the first half die body (preferably the back die) with
respect to the second half die body (preferably the front
die).
According to still another particularly usefull
feature of the invention the die assembly may comprise
means to move the first half die body along a longitudinal
direction parallel to the centre plane of the die assembly,
and means to retain the second half die body in fixed
position in said longitudinal direction, so that a movement
of the first half die body along said longitudinal
direction results in a symetric movement of the two half
die bodies with respect to each other in the transversal
direction perpendicular to the centre plane of the die
assembly.
By this arrangement, a movement of the first half die body (preferably the back die) in the longitudinal direction, i.e. parallel to the centre plane of the die assembly, automatically results in a corresponding transversal movement, i.e. a movement perpendicular to the centre plane, of the first half die body (preferably the back die), and a simultaneous, symetric (i.e. in opposite direction) transversal movement of the second half die body (preferably the front die) over the same distance
By this arrangement, a movement of the first half die body (preferably the back die) in the longitudinal direction, i.e. parallel to the centre plane of the die assembly, automatically results in a corresponding transversal movement, i.e. a movement perpendicular to the centre plane, of the first half die body (preferably the back die), and a simultaneous, symetric (i.e. in opposite direction) transversal movement of the second half die body (preferably the front die) over the same distance
The particular construction according to the
present invention makes it possible to avoid the inherent
drawback of the known constructions according to which the
oblique slots must necesserily entirely lie outside the
broadest die width, automatically resulting in a die
assembly with very broad half dies, at the front as well
as at the back. At the front side this does not constitute
so much a problem, but at the back side it prevents making
Z-folds in the metal sheets.
In the novel principle of die construction according to the
present invention the width necessary for the oblique slots
can lie entirely underneeth the die width. The back die can
thus remain narrow so that making Z-folds in the metal
sheets is not hindered.
A further advantage of the new principle resides
in the fact that only one half die has to be moved
longitudinally. This is easier and cheaper to achieve than
having to move both half dies. Additionally, according to
the new principle, only the back die has to be extended for
the length corresponding to the longitudinal movement of
the die, whereas in the known construction both half dies
have to be considerably longer than the folding length.
The invention will be further explained herebelow
with reference to the attached drawings representing a
preferred embodiment of the invention. It should be
observed that the specific features of this embodiment are
only described as preferred examples of what is intended
within the above general disclosure of the invention and
should by no means be interpretted as limitting the scope
of the invention as such and as set forth in the claims.
In the drawings :
The lower tool assembly for a sheet metal forming
machine, according to the invention, shown in figures 1 and
2, comprises a base plate (1) having an upper surface (13)
supporting the lower surface (14) of a back half die body
(2). The back half die body (2) has an upper surface (15)
supporting the lower surface (16) of a front half die body
(3).
The upper surface (13) of the base plate(1) and the lower surface (14) of the back half die (2) are respectively provided with one oblique slot (9) and one oblique slot (8) - at an angle alpha with respect to the longitudinal direction of the lower tool assembly - cooperating with keys (7) to bring about a transverse movement of the back half body (2) with respect to the base plate (1) - i.e. a movement perpendicular to the centre plane (Y,Z) of the lower tool assembly - when a longitudinal movement - parallel to the centre plane (Y,Z) - is imparted to the back half die (2).
The upper surface (15) of the back half die (2) and the lower surface (16) of the front half die (3) are respectively provided with one oblique slot (12) and one oblique slot (11) - at anangle 2 alpha with respect to the
longitudinal direction of the lower tool assembly -
cooperating with keys (10) to bring about a transverse
movement of the front half body (2) with respect to the
back half body (2) (and with respect to the base plate (1))
- i.e. a movement perpendicular to the centre plane (Y,Z)
of the lower tool assembly - when a longitudinal movement -
parallel to the centre plane (Y,Z)- is imparted to the
back half die body (2).
The upper surface (13) of the base plate(1) and the lower surface (14) of the back half die (2) are respectively provided with one oblique slot (9) and one oblique slot (8) - at an angle alpha with respect to the longitudinal direction of the lower tool assembly - cooperating with keys (7) to bring about a transverse movement of the back half body (2) with respect to the base plate (1) - i.e. a movement perpendicular to the centre plane (Y,Z) of the lower tool assembly - when a longitudinal movement - parallel to the centre plane (Y,Z) - is imparted to the back half die (2).
The upper surface (15) of the back half die (2) and the lower surface (16) of the front half die (3) are respectively provided with one oblique slot (12) and one oblique slot (11) - at an
As clearly illustrated by a comparison of figures
1a and 2a, and figures 1b and 2b respectively, the width
(4) between jaw (5) of the back half die body (2) and jaw
(6) of the front half (3) die body can be adjusted by
moving the back half die in the longitudinal direction,
whereas the front half die body is maintained in place in
the longitudinal direction. Cooperation of the slots and
keys of the base plate and the half die bodies results in
a simetric movement of the two half die bodies with respect
to each other, namely a movement of the the back die body
(2) perpendicular to the centre plane (Y,Z), and a
simultaneous, symetric (i.e. in opposite direction)
transversal movement of the front die body (3) over the
same distance.
Figures 3a, 3b and 4 illustrate another
embodiment of the invention in which several parallel
oblique slots - two in the present case - (11) and (11')
are provided in the upper surface (15) of the back half die
body (2), cooperating with several parallel keys - two in
the present case - (10) and (10') provided to the lower
surface (16) of the front half die body (3) - either
directly or in corresponding slots in the front half die
body (not represented)-.
As illustrated by a comparison of figures 3b and
4, the width (4) between the jaws of the half die bodies
(2) and (3) can be adjusted by moving the back half die in
longitudinal direction, whereas the front half die body is
maintained in place, in a similar way as explained above
in respect of the embodiment of figures 1 - 2.
Whether one slot and die or several slots and
dies are most appropriately provided for the relative
movement of the base plate / back half die and/or of the
back half die / front half die will depend on the
dimensional circumstances and the adjustability
requirements of the lower tool assembly considered, and
will easily be figured out by the skilled art worker.
A representation of a lower tool assembly of the
know type, as referred to hereabove in the discussion of
the state of the art, is given in figure 5 to illustrate
the more compact construction of a lower tool assembly
according to the principle of the present invention. In
such devices according to the state of the art principles,
both the back half die (2) and the front half die (3) have
to be sufficiently broad to accommodate the oblique slots
which must necesserilly extend beside the entire die width.
It is clear that the die assembly according to the
invention presents a considerable advantage also from this
point of view.
Claims (6)
- Die assembly for a sheet metal forming machine comprising a base plate (1) and two half die bodies (2,3) which are moveable with respect to each other to provide an adjustable die width (4) between jaws (5,6) borne by said half die bodies, said half die bodies being each obliquely moveable with respect to the centre plane (Y,Z) of the die assembly between said jaws (5,6), characterised in that a first half die body (2) is arranged on the base plate (1), linearly moveable according to an angle alpha with respect to said centre plane (Y,Z), and a second half die body (3) is arranged on said first half die body (2) linearly moveable at an angle 2 times alpha with respect to said centre plane (Y,Z).
- Die assembly according to claim 1, characterised in that the back half die body (2) of the die assembly is arranged on the base plate (1) of the die assembly, and the front half die body (3) of the die assembly is arranged on the back half die body (2) of the die assembly.
- Die assembly according to any one of the preceding claims, characterised in that said first half die body (2) and said base plate (1), and, respectively, said second half die body (3) and said first half die body (2) are provided with cooperating obliquely arranged keys (7,10) and oblique slots (8,9; 11,12).
- Die assembly according to any one of the preceding claims, characterised in that the upper surface (13) of the base plate (1) is provided with at least one oblique slot (8), lying at an angle alpha with respect to the centre plane (Y,Z) of the die assembly, and the bottom surface (14) of said first half die body (2) is provided with one or more corresponding oblique slots (9) also lying at an angle alpha with respect to the centre plane (Y,Z) of the die assembly, whereas a number of keys (7) provided in said slots (8,9) allow an oblique movement of the first half die body (2) with respect to the base plate (1).
- Die assembly according to any one of the preceding claims, characterised in that the upper surface (15) of the first half die (2) is provided with at least one oblique slot (11), lying at an angle 2 times alpha with respect to the centre plane (Y,Z) of the die assembly, and the bottom surface (16) of said second half die body (3) is provided with one or more corresponding oblique slots (12) also lying at an angle 2 times alpha with respect to the centre plane (Y,Z) of the die assembly, whereas a number of keys (10) provided in said slots (11,12) allow an oblique movement of the first half die body (2) with respect to the second half die body (3).
- Die assembly according to any one of the preceding claims, characterised in that it comprises means to move the first half die body (2) along a longitudinal direction parallel to the centre plane (Y,Z) of the die assembly, and means to retain the second half die body (3) in fixed position in said longitudinal direction, so that a movement of the first half die body (2) along said longitudinal direction results in a symetric movement of the two half die bodies (2,3) with respect to each other in the transversal direction perpendicular to the centre plane (Y,Z) of the die assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97200800A EP0865840A1 (en) | 1997-03-17 | 1997-03-17 | Adjustable die assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97200800A EP0865840A1 (en) | 1997-03-17 | 1997-03-17 | Adjustable die assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0865840A1 true EP0865840A1 (en) | 1998-09-23 |
Family
ID=8228117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97200800A Withdrawn EP0865840A1 (en) | 1997-03-17 | 1997-03-17 | Adjustable die assembly |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0865840A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1287916A2 (en) * | 2001-08-29 | 2003-03-05 | Angelo Romani S.p.A. | Adjustable forming die, in particular for forming presses |
| WO2010099559A1 (en) * | 2009-03-04 | 2010-09-10 | Trumpf Maschinen Austria Gmbh & Co. Kg. | Method and tool for air bending provided with an adjustable die |
| CN102632156A (en) * | 2012-04-25 | 2012-08-15 | 安徽联盟模具工业股份有限公司 | Adjustable lower die mechanism of metal plate bending die |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4106323A (en) * | 1975-06-24 | 1978-08-15 | Haennerle AG | Bending tool |
| WO1994009924A1 (en) * | 1992-10-26 | 1994-05-11 | Nya Ursvikens Mekaniska Verkstads Ab | Adjustable die assembly |
-
1997
- 1997-03-17 EP EP97200800A patent/EP0865840A1/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4106323A (en) * | 1975-06-24 | 1978-08-15 | Haennerle AG | Bending tool |
| WO1994009924A1 (en) * | 1992-10-26 | 1994-05-11 | Nya Ursvikens Mekaniska Verkstads Ab | Adjustable die assembly |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1287916A2 (en) * | 2001-08-29 | 2003-03-05 | Angelo Romani S.p.A. | Adjustable forming die, in particular for forming presses |
| EP1287916A3 (en) * | 2001-08-29 | 2003-04-16 | Angelo Romani S.p.A. | Adjustable forming die, in particular for forming presses |
| US6810710B2 (en) | 2001-08-29 | 2004-11-02 | Angelo Romani S.P.A. | Adjustable forming die, in particular for forming presses |
| WO2010099559A1 (en) * | 2009-03-04 | 2010-09-10 | Trumpf Maschinen Austria Gmbh & Co. Kg. | Method and tool for air bending provided with an adjustable die |
| CN102632156A (en) * | 2012-04-25 | 2012-08-15 | 安徽联盟模具工业股份有限公司 | Adjustable lower die mechanism of metal plate bending die |
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