EP3283242B1 - Pressure distributor for pressing metals and die using said pressure distributor - Google Patents
Pressure distributor for pressing metals and die using said pressure distributor Download PDFInfo
- Publication number
- EP3283242B1 EP3283242B1 EP16725913.4A EP16725913A EP3283242B1 EP 3283242 B1 EP3283242 B1 EP 3283242B1 EP 16725913 A EP16725913 A EP 16725913A EP 3283242 B1 EP3283242 B1 EP 3283242B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure distributor
- die
- elastically deformable
- plate
- metal sheet
- 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.)
- Active
Links
- 239000002184 metal Substances 0.000 title claims description 52
- 229910052751 metal Inorganic materials 0.000 title claims description 52
- 238000003825 pressing Methods 0.000 title claims description 41
- 150000002739 metals Chemical class 0.000 title 1
- 239000011159 matrix material Substances 0.000 claims description 20
- 239000002131 composite material Substances 0.000 claims description 16
- 229920001971 elastomer Polymers 0.000 claims description 7
- 239000000806 elastomer Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 26
- 230000037303 wrinkles Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JHJNPOSPVGRIAN-SFHVURJKSA-N n-[3-[(1s)-1-[[6-(3,4-dimethoxyphenyl)pyrazin-2-yl]amino]ethyl]phenyl]-5-methylpyridine-3-carboxamide Chemical compound C1=C(OC)C(OC)=CC=C1C1=CN=CC(N[C@@H](C)C=2C=C(NC(=O)C=3C=C(C)C=NC=3)C=CC=2)=N1 JHJNPOSPVGRIAN-SFHVURJKSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
-
- 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
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/04—Blank holders; Mounting means therefor
Definitions
- the invention concerns a pressure distributor for metal forming, particularly suited to be used in dies for forming sheet metal and especially for deep-drawing according to the preamble of claim 1.
- Forming processes are used to make objects by deforming a material using pieces of equipment called "dies".
- a die in its basic configuration, comprises a punch that forces the metal sheet inside a matrix so as to obtain a concave configuration of the metal sheet reproducing the outline of the matrix in plan view.
- the forming operation in this case is called “drawing”, and if the depth of the item that is being formed exceeds its larger dimension in plan view, the drawing process is called “deep drawing”.
- the edges of the metal sheet are maintained adherent to the matrix by means of a sheet pressing device that, applying pressure at right angles to the edge of the metal sheet and distributing said pressure on the surface of the edge itself, prevents the metal sheet from corrugating and controls its sliding movements.
- the sheet pressing device is raised in the areas surrounding the deformed area, where the metal sheet, being subjected to a reduced holding action, slides more.
- the formed object may even break.
- a first drawback lies in that the above mentioned mechanical-hydraulic thrusting units involve purchase and installation costs that must be added to the already high costs borne by the user for the purchase and installation of the presses.
- a further drawback is represented by the fact that said mechanical-hydraulic thrusting units are characterized by a recognized lack of flexibility of use, as the same thrusting unit can be used only for dies suited to produce formed objects having geometrically similar shapes.
- the pressure devices are arranged at the periphery of the punch, are spaced from one another and each one of them is provided with a braking pad suited to come into contact with the edge of the metal sheet to be drawn during the drawing process.
- the elastic thrust exerted by the pressing device against the edge of the metal sheet controls the deformation to which the metal sheet is subjected when the punch forces it inside the matrix.
- the latter is made elastic thanks to the presence of a yielding element that in the case described in the patent document is constituted by a rubber block included between the sheet pressing device and a holding plate which are both fixed by means of screws to a movable element of the press that is coaxial and external to the punch.
- none of the devices described above improves the absorption of the variable forces that develop in the areas where the thickness of the metal sheet is increased during the forming process.
- the present invention intends to overcome all of the drawbacks described above.
- the use of the pressure distributor that is the subject of the invention improves the distribution of pressures on the metal sheet during the forming process and reduces the differences in thickness that are found on the formed product once the forming process has been completed.
- a preferred embodiment of the pressure distributor that is the subject of the present invention is represented in axonometric view in Figure 1 , where it is indicated as a whole by 1 and is associated with a die indicated as a whole by 10 and represented in open configuration in Figure 1 and in closed configuration in Figure 2 .
- the pressure distributor 1 in fact, is configured in such a way that it can be placed between the matrix 11 and the base 12 of the die 10 during the forming process carried out on a metal sheet A which, as can be observed in the Figures from 3 to 5, is interposed between the matrix 11 and the pressure distributor 1.
- the pressure distributor which can be observed in greater detail in Figure 6 , comprises a composite laminar structure 2 provided with a shaped opening 3 for the passage of the punch 13 of the die 10, wherein said composite laminar structure 2 comprises a sheet pressing plate 21 configured in such a way that it can be placed in contact with the metal sheet A and an elastically deformable plate 22 included between the sheet pressing plate 21 and the base 12 of the die 10.
- a first variant embodiment of the pressure distributor, indicated as a whole by 1a, is visible in Figure 7 and according to this embodiment the composite laminar structure 2a comprises a sheet pressing plate 21 configured in such a way that it can be placed in contact with the metal sheet A, an elastically deformable plate 22 resting on the base 12 of the die 10 and a first intermediate plate 24 included between the sheet pressing plate 21 and the elastically deformable plate 22.
- the composite laminar structure 2b comprises a sheet pressing plate 21 configured in such a way that it can be placed in contact with the metal sheet A, an elastically deformable plate 22 facing and placed against the sheet pressing plate 21 and a second intermediate plate 25 included between the elastically deformable plate 22 and the base 12 of the die 10.
- the composite laminar structure 2c comprises a sheet pressing plate 21 configured in such a way that it can be placed in contact with the metal sheet A, a first intermediate plate 24 included between the sheet pressing plate 21 and an elastically deformable plate 22 and a second intermediate plate 25 included between the elastically deformable plate 22 and the base 12 of the die 10.
- the composite laminar structure 2d comprises a sheet pressing plate 21 configured in such a way that it can be placed in contact with the sheet A, an underlying elastically deformable plate 22 placed against the sheet pressing plate 21 and two second intermediate plates 25 facing each other and included between the elastically deformable plate 22 and the base 12 of the die 10.
- said intermediate plates may be made of metallic or non-metallic materials.
- the pressure distributor of the invention comprises also a frame 4 that delimits perimetrically the composite laminar structure, so that the pressure distributor of the invention constitutes an easily handled unit that can be rapidly and easily installed in and removed from the corresponding die.
- the base 12 of the die 10 there is a perimeter housing 15 that accommodates the frame 4 in order to stabilize the pressure distributor when it is installed in the die.
- this is preferably but not exclusively made of an elastomer or an equivalent material and therefore it is characterized by reduced hardness and increased elasticity compared to the overlying sheet pressing plate 21, so that during the forming of the metal sheet A it serves the function of absorbing and distributing pressure, which is described in greater detail below.
- the elastically deformable plate in turn has a variant embodiment illustrated in Figure 11 and indicated as a whole by 23, comprising a pair of parallel foils 23a, 23b spaced from each other through the interposition of two or more annular gaskets 23c, 23d, wherein the foils together with the gaskets define an annular chamber 23e containing a fluid 23f that can be a liquid or a gas.
- the pressure distributor 1 is arranged in the operating position with the frame 4 housed in the annular cavity 15 provided in the base 12 of the die 10, after arranging the punch 13 so that it is completely recessed within the base 12 itself, as can be seen in Figure 4 .
- the metal sheet A is positioned on the pressure distributor 1 so that the metal sheet is included between the latter and the overlying matrix 11.
- any pressure distributor made according to any of the variant embodiments described above may be used, but for the sake of simplicity here below reference is made to the pressure distributor indicated as a whole by 1 and comprising the sheet pressing plate 21 and the underlying elastically deformable plate 22 made of an elastomer.
- the punch 13 is lifted and this penetrates the matrix 11 as shown in Figure 5 and thus deforms the metal sheet A, creating in the same a cavity with variable shape and depth that depend on the shape of the punch 13 and the depth of penetration of the same in the matrix 11 itself.
- the metal sheet A is deformed and in some of its perimeter areas, in particular in proximity to the angular areas of the matrix 11, during the bending operation it is subjected to a compression force that increases its thickness from value A1 to value A2, which is schematically represented in Figure 12 , in which the deformation states are represented in a marked way on purpose, in order to make them more evident.
- the increase in the thickness of the metal sheet generates a thrusting action F that deforms the underlying sheet pressing plate 21, which in turn deforms the underlying elastically deformable plate 22.
- the areas adjacent to the area where the sheet pressing plate 21 is deformed tend to become spaced from the metal sheet A that, being less controlled in those areas, shows an increased tendency to slide. Said uncontrolled sliding movement of the metal sheet, however, is counteracted by the elastically deformable plate 22, as the elastomer with which it is made substantially behaves as a fluid and transforms the localized deforming force F into a pressure P that acts on the sheet pressing plate 21 at the level of the areas around the deformation area, in the direction contrary to that of the force F, as schematically represented in Figure 12 .
- the elastomer with which the elastically deformable plate 22 is made absorbs the deforming force F and redistributes it on the overlying sheet pressing plate 21 in the form of a counter pressure P 1 with value equal to that of the pressure P that is distributed based on the well-known Pascal's law. Therefore, in the areas around the area where the sheet pressing plate 21 has been deformed said counter pressure P 1 tends to move the sheet pressing plate 21 back towards the metal sheet A that is thus held in a substantially uniform way along its entire perimeter edge for the whole duration of the forming process.
- the embodiment of the pressure distributor that, as explained above, is constituted by the composite laminar structure made up of a sheet pressing plate, an elastically deformable plate, intermediate plates in a variable number and the frame that delimits them, makes it possible to provide a unit that can be rapidly installed in and removed from a die with operations that can be carried out in a simple and safe manner also by inexpert personnel.
- the use of the pressure distributor of the present invention makes it possible to eliminate the need to use the costly hydraulic equipment that according to the known art is presently used to control the sliding movements of the metal sheet during the forming process.
- the pressure distributor of the invention may be subjected to modifications and variants that are neither illustrated in the drawings nor described herein but that must all be considered protected by the present patent, provided that they fall within the scope of the claims expressed below.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Forging (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITVI2015A000101A ITVI20150101A1 (it) | 2015-04-16 | 2015-04-16 | Ripartitore di pressione per lo stampaggio di metalli e stampo utilizzante il suddetto ripartitore di pressione |
PCT/IB2016/052134 WO2016166701A1 (en) | 2015-04-16 | 2016-04-14 | Pressure distributor for pressing metals and die using said pressure distributor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3283242A1 EP3283242A1 (en) | 2018-02-21 |
EP3283242B1 true EP3283242B1 (en) | 2019-02-13 |
Family
ID=53490213
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16725913.4A Active EP3283242B1 (en) | 2015-04-16 | 2016-04-14 | Pressure distributor for pressing metals and die using said pressure distributor |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3283242B1 (it) |
ES (1) | ES2725102T3 (it) |
IT (1) | ITVI20150101A1 (it) |
WO (1) | WO2016166701A1 (it) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR884771A (fr) * | 1940-02-12 | 1943-08-26 | Helfeda S A | Procédé d'emboutissage et dispositif pour sa mise en oeuvre |
CS217890B1 (en) * | 1981-04-01 | 1983-01-28 | Jindrich Spacek | Instrument for hydromechanicyl drawing particularly flangeless extract |
JP2751310B2 (ja) * | 1988-03-23 | 1998-05-18 | トヨタ自動車株式会社 | プレス絞り成型装置 |
DE19503874A1 (de) * | 1995-02-07 | 1996-08-08 | Gerhard Pirchl | Tiefziehwerkzeug mit integriertem Niederhalter |
DE102009018523B3 (de) * | 2009-04-24 | 2011-02-17 | Gottfried Wilhelm Leibniz Universität Hannover | Niederhalter |
-
2015
- 2015-04-16 IT ITVI2015A000101A patent/ITVI20150101A1/it unknown
-
2016
- 2016-04-14 EP EP16725913.4A patent/EP3283242B1/en active Active
- 2016-04-14 WO PCT/IB2016/052134 patent/WO2016166701A1/en unknown
- 2016-04-14 ES ES16725913T patent/ES2725102T3/es active Active
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
ITVI20150101A1 (it) | 2016-10-16 |
ES2725102T3 (es) | 2019-09-19 |
EP3283242A1 (en) | 2018-02-21 |
WO2016166701A1 (en) | 2016-10-20 |
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