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WO2012089597A1 - Procédé de cintrage d'un panneau en résine - Google Patents

Procédé de cintrage d'un panneau en résine Download PDF

Info

Publication number
WO2012089597A1
WO2012089597A1 PCT/EP2011/073679 EP2011073679W WO2012089597A1 WO 2012089597 A1 WO2012089597 A1 WO 2012089597A1 EP 2011073679 W EP2011073679 W EP 2011073679W WO 2012089597 A1 WO2012089597 A1 WO 2012089597A1
Authority
WO
WIPO (PCT)
Prior art keywords
panel
resin
bending
heated
die
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.)
Ceased
Application number
PCT/EP2011/073679
Other languages
English (en)
Inventor
Massimo Mazza
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2012089597A1 publication Critical patent/WO2012089597A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/0055—Shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/04—Bending or folding of plates or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B29C53/84—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles

Definitions

  • the present patent application for industrial invention relates to a bending process of a flat resin panel that has undergone one or more finishing works.
  • a curved resin panel is currently obtained with an ordinary mold in which resin is injected and from which a raw panel with desired curved profile is extracted.
  • the raw panel then undergoes various finishing processes, such as squaring, sizing, painting, smoothing and brushing or polishing.
  • Said finishing processes are very laborious and complicated, given the fact that they have to be performed with craftsmanlike technique on a curved panel.
  • finishing processes must be performed on one curved panel at a time, with time waste and high labor costs.
  • WO2006/002020 discloses a method used to make a vehicle component, such as a door.
  • the method provides for injection molding of a panel comprising an extension in the form of a flange.
  • a flange is already curved, as clearly shown in Figs. 2 and 2a of WO2006/002020.
  • finishing works such as removal of excessive material, are performed.
  • said finishing works performed on a curved panel are impaired by all the foregoing inconveniences.
  • WO2006/002020 also discloses a curving method wherein a resin substrate undergoes localized heating (for instance, by means of infrared radiation). So the panel is only curved in the heated areas due to melting of substrate in said heated areas. Evidently, melting of the resin substrate is performed at very high temperature and would undoubtedly damage any surface finishing works performed in the heated areas. Hence, said localized curving method is not suitable for complete bending of the panel and cannot be applied to panels with valuable surface finishes.
  • the purpose of the present invention is to eliminate the inconveniences of the prior art by disclosing a process for bending a flat resin panel that is practical, versatile, efficient, inexpensive and simple to make.
  • the bending process of a resin panel according to the present invention comprises the following steps:
  • Fig. 1 is a diagrammatic block diagram of the bending process of a resin panel according to the invention
  • Fig. 2 is a diagrammatic cross-sectional view showing heating and bending of the resin panel of the invention.
  • a bending process of a resin panel according to the invention provides for a first molding step (1 ) from which a flat panel (2), which has no bending, is obtained.
  • the molding step (1 ) provides for injection molding of resins in a mold for flat panels, i.e. panels in the form of a rectangular plate.
  • resins especially unsaturated polyester resins, are used.
  • resins are loaded with colored pigments, in such manner to directly obtain a flat panel (2) with the desired color.
  • the panel (2) may comprise an insert (20) drowned in a resin coating (21 ) that completely surrounds the insert.
  • the insert (20) is not visible.
  • the insert (20) can have a filling and lightening function for the panel and in such a case the insert (20) is made of a lighter material than the polyester resin used for coating (21 )
  • the insert (20) can be a Polyvinyl Chloride (PVC) or expanded polyurethane sheet.
  • the insert (20) can also have a stiffening function for the panel and in such a case the insert (20) is made of a heavier material than the coating (21 )
  • the insert (20) can be an aluminum sheet.
  • the insert (20) must be a flexible sheet that can be bent together with the flat resin panel (2).
  • the flat panel (2) with the desired color undergoes a set of finishing works (3) comprising, for example, one or more of the following operations, respecting or not the following sequence:
  • finishing works are practical and easy and can be performed for several panels simultaneously or continuously.
  • a finished flat panel (4) is obtained from the finishing step (3) and subjected to final heating and bending (5).
  • the finished flat panel (4) is heated to the resin tempering temperature.
  • the resin tempering temperature is comprised between 80-120 °C, for this reason the finished panel (4) is heated until a temperature comprised between 80 - 120 °C is reached.
  • the finished panel (4) can be heated either with a hot fluid in gaseous or liquid status or with a suitably heated bending mold.
  • the panel can be heated with a traditional furnace with rigorous control of the heating temperature.
  • heating can be obtained with hot water.
  • a polyester resin with tempering temperature of approximately 1 00 °C is used.
  • hot water can be used as heat source; the panel (4) is totally immersed in a hot water bath at 1 00 °C, where it is left until the tempering temperature of the molding resin is reached uniformly; the choice of the water bath ensures rapid heating of the flat panel (4) without risk of damaging the finished surface.
  • a tub (50) contains hot water (51 ) at 100 °C temperature.
  • the panel (4) is immersed in hot water (51 ).
  • the panel (4) is disposed according to a substantially vertical plane and is held by means of suitable holders (52, 53) on the lower and upper edges.
  • the tub (50) contains a bending mold (7) comprising a die (70) with convex surface (71 ) and a lid (72) with concave surface (73).
  • a bending mold (7) comprising a die (70) with convex surface (71 ) and a lid (72) with concave surface (73).
  • the panel (6) When bending is completed, the panel (6) is cooled with cold water introduced in the tub (50) after draining the hot water (51 ).
  • the curved panel (6) After being extracted from the mold (7), the curved panel (6) perfectly maintains its curved shape.
  • the external surface of the curved panel (6) i.e. the surface adapted to remain visible
  • the concave surface (73) of the lid (72) can be advantageously made of glass in order not to damage the panel visible surface.
  • the convex surface (71 ) of the die can be made of glass.
  • FIG. 2 illustrates a tub (50) with only one mold (7) for bending one panel at a time
  • said tub can be evidently dimensioned in such manner to contain several molds (7), either in side-by- side or stacked configuration, in such a way to bend several panels simultaneously, thus reducing process time and cost.
  • the panel (4) is arranged vertically and the mold (7) is illustrated with die and lid, the panel (4) can be disposed in horizontal position on a convex die, without lid, and bent by means of vacuum or air extraction. In other words, bending of the panel is performed by positioning the panel on the die and extracting air or creating a vacuum between panel and die, in such a way that the panel takes the convex profile of the die.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

La présente invention concerne un procédé de cintrage de panneau moulé en résine (6). Selon ce procédé, la résine est moulée afin d'obtenir un panneau plat (2) qui subit un ou plusieurs travaux de finition. Ceci permet d'obtenir un panneau plat fini (4) conçu pour être chauffé à la température de recuit de la résine utilisée pour le moulage et être cintré à l'aide d'un moule de cintrage (7) qui permet d'obtenir un panneau cintré fini (6).
PCT/EP2011/073679 2010-12-31 2011-12-21 Procédé de cintrage d'un panneau en résine Ceased WO2012089597A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITAN2010A000222 2010-12-31
ITAN2010A000222A IT1404114B1 (it) 2010-12-31 2010-12-31 Procedimento per la curvatura di un pannello di resina.

Publications (1)

Publication Number Publication Date
WO2012089597A1 true WO2012089597A1 (fr) 2012-07-05

Family

ID=43736731

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/073679 Ceased WO2012089597A1 (fr) 2010-12-31 2011-12-21 Procédé de cintrage d'un panneau en résine

Country Status (2)

Country Link
IT (1) IT1404114B1 (fr)
WO (1) WO2012089597A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108656438A (zh) * 2018-05-02 2018-10-16 芜湖众梦电子科技有限公司 一种用于汽车模具的翻边顶料机构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109849259B (zh) * 2018-12-10 2021-11-02 合肥联宝信息技术有限公司 一种制造壳体的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1193141A (en) * 1966-04-12 1970-05-28 Zentrallaboratorium Fur Plastv Method and Apparatus for producing Hollow Plastics Bodies
EP0551701A1 (fr) * 1990-06-11 1993-07-21 Siebolt Hettinga Procédé de moulage par injection d'un stratifié plat déformable
EP0778122A2 (fr) * 1995-10-16 1997-06-11 The Boeing Company Procédé et appareil de formage d'une ame en nid d'abeilles
WO2006002020A2 (fr) 2004-06-15 2006-01-05 Johnson Controls Technology Company Element de vehicule et procede de fabrication associe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5419863A (en) * 1992-03-06 1995-05-30 The Standard Products Company Method of making a seamless backfilled molding

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1193141A (en) * 1966-04-12 1970-05-28 Zentrallaboratorium Fur Plastv Method and Apparatus for producing Hollow Plastics Bodies
EP0551701A1 (fr) * 1990-06-11 1993-07-21 Siebolt Hettinga Procédé de moulage par injection d'un stratifié plat déformable
EP0778122A2 (fr) * 1995-10-16 1997-06-11 The Boeing Company Procédé et appareil de formage d'une ame en nid d'abeilles
WO2006002020A2 (fr) 2004-06-15 2006-01-05 Johnson Controls Technology Company Element de vehicule et procede de fabrication associe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108656438A (zh) * 2018-05-02 2018-10-16 芜湖众梦电子科技有限公司 一种用于汽车模具的翻边顶料机构
CN108656438B (zh) * 2018-05-02 2020-12-04 亳州易泽信息科技有限公司 一种用于汽车模具的翻边顶料机构

Also Published As

Publication number Publication date
ITAN20100222A1 (it) 2012-07-01
IT1404114B1 (it) 2013-11-15

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