WO2003103923A1 - Method of injection molding a part of plastic material - Google Patents
Method of injection molding a part of plastic material Download PDFInfo
- Publication number
- WO2003103923A1 WO2003103923A1 PCT/IT2003/000355 IT0300355W WO03103923A1 WO 2003103923 A1 WO2003103923 A1 WO 2003103923A1 IT 0300355 W IT0300355 W IT 0300355W WO 03103923 A1 WO03103923 A1 WO 03103923A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cavity
- sheet
- plastic material
- cup
- metal material
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 title claims abstract description 28
- 239000004033 plastic Substances 0.000 title claims abstract description 27
- 238000001746 injection moulding Methods 0.000 title description 2
- 239000007769 metal material Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 9
- 239000002828 fuel tank Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 230000013011 mating Effects 0.000 claims 1
- 239000012815 thermoplastic material Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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
- B29C45/14—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
- B29C45/1418—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 the inserts being deformed or preformed, e.g. by the injection pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
Definitions
- the present invention relates to a method of molding a part of plastic material.
- Methods of molding parts of plastic material are known in which liquid plastic material is injected under pressure into a mold cavity; and the molds comprise a number of component parts, which can be disassembled to remove the part from the mold once the plastic material has set and cooled.
- a portion of the molding is coated with metal for aesthetic and/or structural reasons .
- the metal coating is normally deposited electrochemically, e.g. by chromium or nickel plating.
- a method of molding a part of plastic material characterized by comprising the steps of : providing at least one mold having at least one inner cavity; placing inside said cavity a body defined by a sheet of deformable metal material; injecting plastic material under pressure inside said cavity to deform said sheet of metal material towards the walls of said cavity, so that said sheet of metal material rests on said walls and assumes the shape of at least part of said cavity; allowing said plastic material to set, and extracting a body of plastic material formed in one piece and having at least one portion covered with a shaped sheet of metal .
- Figure 1 shows a longitudinal section of a mold which may be used to implement the method according to the present invention
- Figure 2 shows a first step in the method according to the present invention
- Figure 3 shows a second step in the method according to the present invention
- Figure 4 shows a third step in the method according to the present invention
- Figure 5 shows, by way of example, a view in perspective of a part molded from plastic material and which can be produced using the method according to the present invention.
- FIG. 1 shows a mold which can be used to implement the method according to the present invention. More specifically, the mold comprises a first top half-mold 1 defined by a number of parts (detailed later on) ; and a second bottom half-mold 2 also defined by a number of parts (not detailed for the sake of simplicity) .
- Top half-mold 1 defines a first cavity 4 defined by a cylindrical wall 5 coaxial with an axis 6, by an annular, substantially C-shaped wall 7 radially larger than cylindrical wall 5, and by a substantially flat wall 8 connected to annular wall 7 and crosswise to axis 6.
- half-mold 1 comprises a first and a second portion 10 and 11 facing each other and defining opposite portions of walls 5 and 7; and a third portion 13 defining wall 8 and the adjacent edge of annular wall 7.
- Half-mold 2 defines a substantially cylindrical second cavity 16 coaxial with axis 6, communicating with cavity 4, and in turn defined by a wall portion 17 having a thread or similar (e.g. a profile forming a bayonet connection) .
- a cup-shaped body 20 defined by a roughly 0.4-0.6 mm thick sheet of deformable metal material (e.g. aluminium) is inserted inside first cavity
- cup-shaped body 20 comprises a tubular portion 21 closed on a first side by an integral dome-shaped portion 22, and having a peripheral annular edge 24 extending radially outwards from a second side of tubular portion 21.
- Cup-shaped body 20 is positioned coaxially with axis 6, with tubular portion 21 facing cylindrical wall 5 and annular wall 7, and with dome-shaped portions 22 facing wall 8; and half-molds 1 and 2 are positioned so that peripheral annular edge 24 is gripped in fluidtight manner between half-molds 1 and 2 in the closed position.
- a male cylindrical member 30 is inserted inside second cavity 16 and a large portion of first cavity 4. More specifically, member 30 is positioned coaxially with axis 6, with an end portion 30a facing cup-shaped body 20, which is thus interposed between the walls defining cavity 4 and member 30.
- thermoplastic material 33 is injected under pressure inside the gap 34 ( Figure 3) defined by cup-shaped body 20 and member 30.
- the injection pressure may conveniently be roughly 1200-2500 bars, and the injection temperature roughly 180-350 °C.
- thermoplastic material 33 exerts pressure (Pascal's law) on the sheet of metal material forming cup-shaped body 20, and pushes the sheet of metal material towards the walls of cavity 4 so that it rests on cylindrical wall 5, annular wall 7, and wall 8, thus assuming the shape of cavity 4.
- the thermoplastic material 33 injected into cavity 4 thus fills all the space between the deformed sheet of metal material and member 30.
- thermoplastic material 33 also penetrates second cavity 16 having no sheet of metal material, e.g. penetrates a cylindrical tubular gap between wall 17 and member 30.
- member 30 has a nozzle 37 on end portion 30a, by which the liquid thermoplastic material 33 is expelled.
- thermoplastic material is allowed to set.
- a fifth step in the method according to the present invention the mold is opened to extract the finished part.
- third portion 13 is detached and removed from first and second portion 10,
- First and second portion 10, 11 are then withdrawn in opposite directions to extract the part of plastic material, complete with the cup-shaped body shaped by the operations described above, from half-mold 1.
- FIG. 5 shows, by way of a non-limiting example, a view in perspective of a part which can be produced using the method according to the present invention.
- the part shown is a fuel tank cap of a prestige vehicle (e.g. a limited-number sports car) , which comprises a threaded tubular portion made of plastic material and closed at one end by an integral portion covered with a shaped sheet of metal .
- a prestige vehicle e.g. a limited-number sports car
- the finished part has a shaped metal layer of considerable thickness, which is not deposited, and which is firmly retained on the part of plastic material; and the resulting mechanical consistency and look are far superior to those achievable using known methods .
- the molding method also provides for so shaping the sheet of metal material that, in section, it comprises at least a first portion of transverse dimensions Dl ( Figure 4) greater than the transverse dimensions D2 of a second portion, so that the shaped sheet firmly envelopes the underlying portion of plastic material .
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003237605A AU2003237605A1 (en) | 2002-06-07 | 2003-06-05 | Method of injection molding a part of plastic material |
DE10392792T DE10392792T5 (en) | 2002-06-07 | 2003-06-05 | Method for injection molding a part of plastic material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITT02002A000478 | 2002-06-07 | ||
IT2002TO000478A ITTO20020478A1 (en) | 2002-06-07 | 2002-06-07 | MOLDING METHOD OF A PIECE OF PLASTIC MATERIAL. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003103923A1 true WO2003103923A1 (en) | 2003-12-18 |
Family
ID=27639140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT2003/000355 WO2003103923A1 (en) | 2002-06-07 | 2003-06-05 | Method of injection molding a part of plastic material |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU2003237605A1 (en) |
DE (1) | DE10392792T5 (en) |
IT (1) | ITTO20020478A1 (en) |
WO (1) | WO2003103923A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005109984A2 (en) * | 2004-05-18 | 2005-11-24 | Bang & Olufsen A/S | A process for the manufacture of a hybrid element comprising a metal skin |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2131319A (en) * | 1933-01-03 | 1938-09-27 | Crown Cork & Seal Co | Method and apparatus for making composite caps |
US2158044A (en) * | 1929-05-18 | 1939-05-09 | Hygrade Sylvanla Corp | Method of making contactor bases for electric lamps, tubes, and the like |
FR1578138A (en) * | 1968-06-21 | 1969-08-14 | ||
JPS56137A (en) * | 1979-06-18 | 1981-01-06 | Yoshida Kogyo Kk <Ykk> | Manufacture of container and container thereof |
JPH047113A (en) * | 1990-04-25 | 1992-01-10 | Yoshino Kogyosho Co Ltd | Injection molding method |
EP0867334A1 (en) * | 1997-03-27 | 1998-09-30 | R. Schmidt Gmbh | Method and tool for making a rod-shaped supporting body |
-
2002
- 2002-06-07 IT IT2002TO000478A patent/ITTO20020478A1/en unknown
-
2003
- 2003-06-05 DE DE10392792T patent/DE10392792T5/en not_active Withdrawn
- 2003-06-05 WO PCT/IT2003/000355 patent/WO2003103923A1/en not_active Application Discontinuation
- 2003-06-05 AU AU2003237605A patent/AU2003237605A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2158044A (en) * | 1929-05-18 | 1939-05-09 | Hygrade Sylvanla Corp | Method of making contactor bases for electric lamps, tubes, and the like |
US2131319A (en) * | 1933-01-03 | 1938-09-27 | Crown Cork & Seal Co | Method and apparatus for making composite caps |
FR1578138A (en) * | 1968-06-21 | 1969-08-14 | ||
JPS56137A (en) * | 1979-06-18 | 1981-01-06 | Yoshida Kogyo Kk <Ykk> | Manufacture of container and container thereof |
JPH047113A (en) * | 1990-04-25 | 1992-01-10 | Yoshino Kogyosho Co Ltd | Injection molding method |
EP0867334A1 (en) * | 1997-03-27 | 1998-09-30 | R. Schmidt Gmbh | Method and tool for making a rod-shaped supporting body |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 005, no. 043 (M - 060) 23 March 1981 (1981-03-23) * |
PATENT ABSTRACTS OF JAPAN vol. 016, no. 153 (M - 1235) 15 April 1992 (1992-04-15) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005109984A2 (en) * | 2004-05-18 | 2005-11-24 | Bang & Olufsen A/S | A process for the manufacture of a hybrid element comprising a metal skin |
WO2005109984A3 (en) * | 2004-05-18 | 2005-12-29 | Bang & Olufsen As | A process for the manufacture of a hybrid element comprising a metal skin |
Also Published As
Publication number | Publication date |
---|---|
ITTO20020478A1 (en) | 2003-12-09 |
AU2003237605A1 (en) | 2003-12-22 |
DE10392792T5 (en) | 2005-06-30 |
ITTO20020478A0 (en) | 2002-06-07 |
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