WO2016166701A1 - Répartiteur de pression pour le pressage de métaux et matrice utilisant ledit répartiteur de pression - Google Patents

Répartiteur de pression pour le pressage de métaux et matrice utilisant ledit répartiteur de pression Download PDF

Info

Publication number
WO2016166701A1
WO2016166701A1 PCT/IB2016/052134 IB2016052134W WO2016166701A1 WO 2016166701 A1 WO2016166701 A1 WO 2016166701A1 IB 2016052134 W IB2016052134 W IB 2016052134W WO 2016166701 A1 WO2016166701 A1 WO 2016166701A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure distributor
die
elastically deformable
plate
metal sheet
Prior art date
Application number
PCT/IB2016/052134
Other languages
English (en)
Inventor
Vanni VENEZIAN
Pietro ROSSATO
Original Assignee
Euromeccanica S.R.L. A Socio Unico
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Euromeccanica S.R.L. A Socio Unico filed Critical Euromeccanica S.R.L. A Socio Unico
Priority to ES16725913T priority Critical patent/ES2725102T3/es
Priority to EP16725913.4A priority patent/EP3283242B1/fr
Publication of WO2016166701A1 publication Critical patent/WO2016166701A1/fr

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
    • 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.
  • 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 patent document FR 884 771 A is also known, which describes a drawing process and a device suited to implement said process, wherein the edge of the metal sheet to be drawn is pressed against the surface of the matrix of the die by a sheet pressing device.
  • 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.
  • FIG. 1 shows an axonometric view of the pressure distributor of the invention applied to a die arranged in open configuration
  • Figure 2 shows the die of Figure 1 arranged in closed configuration
  • FIG. 3 shows a sectional view of the die with an exploded view of the pressure distributor of Figure 2;
  • Figure 4 shows the die of Figure 3 arranged in closed configuration
  • FIG. 12 shows an enlarged view of a detail of the die of Figure 5, where it is possible to observe in detail how the metal sheet and the pressure distributor of the invention are deformed during the forming process.
  • 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 1 1 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 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. Furthermore, 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)
  • Forging (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un répartiteur de pression (1, 1a, 1b, 1c, 1d) configuré de telle sorte qu'il peut être disposé entre le mandrin (11) et la base (12) d'une matrice (10) pendant le formage d'une tôle métallique (A) interposée entre le mandrin (11) et le répartiteur de pression (1). Le répartiteur de pression (1, 1a, 1b, 1c, 1d) comprend une structure laminaire composite (2, 2a, 2b, 2c, 2d) pourvue d'une ouverture profilée (3) pour le passage du poinçon (13) de la matrice (10), la structure laminaire composite (2, 2a, 2b, 2c, 2d) comprenant une plaque de pressage de tôle (21) configurée de telle sorte qu'elle peut être placée en contact avec la tôle métallique (A) et une plaque élastiquement déformable (22, 23) comprise entre la plaque de pressage de tôle (21) et la base (12) de la matrice (10). Une ou plusieurs plaques intermédiaires (24, 25) peuvent être disposées entre la plaque de pressage de tôle (21) et la plaque élastiquement déformable (22, 23) et/ou entre la plaque élastiquement déformable (22, 23) et la base (12) de la matrice(10).
PCT/IB2016/052134 2015-04-16 2016-04-14 Répartiteur de pression pour le pressage de métaux et matrice utilisant ledit répartiteur de pression WO2016166701A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES16725913T ES2725102T3 (es) 2015-04-16 2016-04-14 Distribuidor de presión para prensar metales y molde que utiliza dicho distribuidor de presión
EP16725913.4A EP3283242B1 (fr) 2015-04-16 2016-04-14 Répartiteur de pression pour le pressage de métaux et matrice utilisant ledit répartiteur de pression

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
ITVI2015A000101 2015-04-16

Publications (1)

Publication Number Publication Date
WO2016166701A1 true WO2016166701A1 (fr) 2016-10-20

Family

ID=53490213

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/052134 WO2016166701A1 (fr) 2015-04-16 2016-04-14 Répartiteur de pression pour le pressage de métaux et matrice utilisant ledit répartiteur de pression

Country Status (4)

Country Link
EP (1) EP3283242B1 (fr)
ES (1) ES2725102T3 (fr)
IT (1) ITVI20150101A1 (fr)
WO (1) WO2016166701A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
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
DE3151382A1 (de) * 1981-04-01 1982-10-21 Továrny strojírenské techniky koncern, 113 42 Praha "werkzeug fuer hydraomechanisches ziehen, insbesondere von ziehteilen ohne flansch"
JPH01317630A (ja) * 1988-03-23 1989-12-22 Toyota Motor Corp プレス絞り成型装置
EP0808224B1 (fr) * 1995-02-07 2000-11-02 Hecralmat Outil d'emboutissage profond a serre-flan integre
DE102009018523B3 (de) * 2009-04-24 2011-02-17 Gottfried Wilhelm Leibniz Universität Hannover Niederhalter

Patent Citations (5)

* Cited by examiner, † Cited by third party
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
DE3151382A1 (de) * 1981-04-01 1982-10-21 Továrny strojírenské techniky koncern, 113 42 Praha "werkzeug fuer hydraomechanisches ziehen, insbesondere von ziehteilen ohne flansch"
JPH01317630A (ja) * 1988-03-23 1989-12-22 Toyota Motor Corp プレス絞り成型装置
EP0808224B1 (fr) * 1995-02-07 2000-11-02 Hecralmat Outil d'emboutissage profond a serre-flan integre
DE102009018523B3 (de) * 2009-04-24 2011-02-17 Gottfried Wilhelm Leibniz Universität Hannover Niederhalter

Also Published As

Publication number Publication date
ES2725102T3 (es) 2019-09-19
ITVI20150101A1 (it) 2016-10-16
EP3283242B1 (fr) 2019-02-13
EP3283242A1 (fr) 2018-02-21

Similar Documents

Publication Publication Date Title
TWI599412B (zh) 壓製成形方法及壓製成形裝置
US9796011B2 (en) Forming die with flexible blank holder
JP6844255B2 (ja) キャラクターラインを有するパネルの製造装置および製造方法
JPWO2016136612A1 (ja) プレス成形方法
EP3283242B1 (fr) Répartiteur de pression pour le pressage de métaux et matrice utilisant ledit répartiteur de pression
MX2019011685A (es) Dispositivo de moldeo por presion y metodo para producir los articulos moldeados por presion.
US8342085B2 (en) Apparatus and method for compensating for stress deformations in a press
CN102896191A (zh) 小圆角整形装置及其整形方法
US5255550A (en) Device for drawing sheet materials in particular sheet blanks
KR200158219Y1 (ko) 벤딩 성형용 프레스 금형 장치
MX2021008959A (es) Metodo de formacion por prensado y aparato de prensado.
CA3056357C (fr) Dispositif de mise en forme par compression et procede de fabrication d'un article mis en forme par compression
US9003855B2 (en) Pressure ring for extrusion press and extrusion press comprising such a pressure ring
KR20110081706A (ko) 프레스성형에 사용되는 주름방지용 금형 및 그를 사용한 열간 프레스 성형방법
JP6330747B2 (ja) プレス成形金型及びプレス成形方法
KR101461793B1 (ko) 프레스 장치
KR20210043201A (ko) 금형장치
JP7069998B2 (ja) 凹状エンボス部を有する自動車外板パネルの製造方法およびプレス成形装置
JP6218895B2 (ja) 絞り成形装置
WO2018044217A1 (fr) Presse et procédé de mise en forme simultanée de plus d'un produit mince
RU2132758C1 (ru) Способ гибки листового материала
JP2003033825A (ja) 板材の成形方法
MX2007010014A (es) Chapa de puerta de alta definicion y metodo para fabricar la misma.
JPS5838620A (ja) 金属薄板の局部成形用金型
KR20180121712A (ko) 프레스 성형 장치

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16725913

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE