GB2242644A - Apparatus for molding lost foam pattern sections - Google Patents

Apparatus for molding lost foam pattern sections Download PDF

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Publication number
GB2242644A
GB2242644A GB9102860A GB9102860A GB2242644A GB 2242644 A GB2242644 A GB 2242644A GB 9102860 A GB9102860 A GB 9102860A GB 9102860 A GB9102860 A GB 9102860A GB 2242644 A GB2242644 A GB 2242644A
Authority
GB
United Kingdom
Prior art keywords
set forth
internal surface
conduit
internal
mold
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.)
Granted
Application number
GB9102860A
Other versions
GB2242644B (en
GB9102860D0 (en
Inventor
Russell J Vanrens
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.)
Outboard Marine Corp
Original Assignee
Outboard Marine Corp
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 Outboard Marine Corp filed Critical Outboard Marine Corp
Publication of GB9102860D0 publication Critical patent/GB9102860D0/en
Publication of GB2242644A publication Critical patent/GB2242644A/en
Application granted granted Critical
Publication of GB2242644B publication Critical patent/GB2242644B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/44—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form
    • B29C44/445—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form in the form of expandable granules, particles or beads
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/58—Moulds
    • B29C44/588—Moulds with means for venting, e.g. releasing foaming gas
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3415—Heating or cooling
    • B29C44/3426—Heating by introducing steam in the mould

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)

Abstract

Apparatus for molding a foam pattern to be used in a lost foam casting process comprises first and second mold pieces 26 and 34 defining a mold cavity 42. An external parting area 58 surrounds the mold cavity 42, and an internal parting area 62 is surrounded by the mold cavity 42. Furthermore a conduit 78 is provided for venting the internal parting area 62 to improve the quality of the foam fill adjacent the internal parting area 62. <IMAGE>

Description

1 APPARATUS FOR MOLDING LOST FOAM PATTERN SECTIONS
BACKGROUND OF THE INVENTION
The invention relates to injection molding apparatus, and more particularly to apparatus for molding evaporable foam patterns to be used in a lost foam casting process. Still more particularly, the invention relates to such apparatus including an internal parting area.
Conventional apparatus for injection molding lost foam patterns includes first and second mold pieces which mate to define therebetween a mold cavity. In the case of such mold pieces defining an annular or endless mold cavity, the mold pieces have substantially abutting or mating surface portions surrounded by the mold cavity. These surface portions define what is known as an internal parting area, i.e., a parting area that is surrounded by the mold cavity. The mold pieces also have substantially abutting or mating surface portions located exteriorly of the mold cavity. These surface portions define what is known as an external parting area.
It is known to provide venting in an external parting area by providing vent grooves in the mating surface portion of at least one of the mold pieces. These grooves are typically approximately.010 inches deep and.500 inches wide and extend from the mold cavity to the periphery of the mold piece. Such vents aid in filling the mold cavity with foam beads by allowing air transporting the beads into the mold cavity to escape from the mold cavity.
Attention is directed to the following U.S. Patents:
Bucy 3,529,657 Sept. 22, 1970 Cotterell 3,941,528 Mar. 2, 1976 Holmes 4,374,636 Feb. 22, 1983 Bartley, et al. 4,447,197 May 8, 1984 Strausfeld 4,496,300 Jan. 29 ' 1985 Smith 4,573,900 Mar. 4, 1986 Amory, et al. 4,681,527 Jul. 21f 1987 SUMMARY OF THE INVENTION
The invention provides apparatus for molding a foam pattern to be used in a lost foam casting process, the apparatus comprising first and second mold pieces defining a mold cavity, and an internal parting area, and means for venting the internal parting area.
The invention also provides molding apparatus comprising first and second mold pieces defining an endless mold cavity, the mold pieces including mating surface portions which are surrounded by the mold cavity and which define therebetween a space, and means for venting the space.
The invention also provides molding apparatus comprising first and second mold pieces defining a mold cavity and including respective first and second internal surface portions defining an internal parting area, the first internal surface portion including a radially outer portion spaced a first distance from the second internal surface portion, and a radially inner portion spaced a second distance greater than the first distance from the second internal surface portion so as to define a space between the radially inner portion and the second internal surface portion, and means for ventIng the space.
1 i i i 1 1:
1 j i 1 1 i A principal feature of the invention is the provision of means f or venting an internal parting area of a molding apparatus. This arrangement has been found to Improve the quality of foam fill adjacent the internal parting area.
other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is an elevational view, partially in section, of an apparatus embodying the invention.
Fig. 2 is a view taken along line.-2-2 in Fig. 1.
Fig. 3 is a view taken along line 3-3 in Fig. 1.
Fig. 4 is a view taken along line 4-4 in Fig. 1.
Fig. 5 is a view taken along line 5-5 in Fig. 3.
Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of the construction and the arrangements of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An apparatus 10 embodying the invention is illustrated in the drawings. Conventional portions of the apparatus 10 are illustrated schematically.
The apparatus 10 comprises (see Fig. 1) first and second or upper and lower steam chests 14 and 18, respectively. Each of the steam chests 14 and 18 has extending therethrough a plurality of cooling lines 22, as is known in the art. Supported by the first steam chest 14 is an upper or first mold piece 26 including a first mold surface 30. Supported by the second steam chest 18 is a lower or second mold piece 34 having a second mold surface 38 engageable with the first mold surface 30 to define therebetween an annular mold cavity 42. The first mold surface 30 includes a generally circular internal portion 46 (Figs. 1 and 3) surrounded by the mold cavity 42, and an annular or endless external portion 50 (Fig. 1) surrounding the mold cavity 42. The second mold surface 38 includes a generally circular internal portion 54 (Figs. 1 and 4) which is surrounded by the mold cavity 42 and which mates with the internal portion 46 of the first mold surface 30. The second mold surface 38 also includes (see Fig. 1) an annular or endless external portion 58 which surrounds the mold cavity 42 and which mates with the external portion 50 of the first mold surface 30.
The internal surface portions 46 and 54 of the mold surfaces 30 and 38 define (see Fig. 1) an internal parting area 62 of the mold surfaces 30 and 38. As described in'greater detail below, the internal surface portions 46 and 54 are at least in part very slightly spaced from each other so that air can flow between the internal surface portions 46 and 54. Thus, a small space exists between the internal surface portions 46 and 54.
The apparatus 10 also comprises (see Fig. 1) means 66 for supplying foam beads or other suitable moldable material to the mold cavity 42. Such means 66 is known in the art and will not be described in greater detail.
The apparatus 10 also comprises (see Fig. 2) external means 70 foxventing the mold cavity 42. While various suitable means can be employed, in the illustrated construction, such means 70 includes a plurality of shallow grooves 74 located in the external portion 50 of the first mold surface 30. Such venting grooves 74 are known in the art and will not be described in greater detail.
The apparatus 10 also comprises (see Fig. 1) means for venting the internal parting area 62 of the mold pieces, i.e., for venting the space between the internal surface portions 46 and 54. Preferably, such means includes a conduit 78 having one end 82 communicating with the internal parting area 62 and an opposite end 86 communicating with the exterior of the apparatus 10. In the illustrated construction, the conduit 78 is supported by the upper steam chest 14 and by the upper mold piece 26. The end 82 of the conduit 78 extends through the upper mold piece 26 to the internal parting area 62, and the end 86 of the conduit 78 extends through the upper steam chest 14 to the atmosphere. The conduit 78 allows air in the mold cavity 42 to escape into the space between the internal surface X portions 46 and 54 and then through the conduit 78 to the atmosphere.
Preferably, the internal surface portion of one of the mold pieces 26 and 34 is relieved to assist venting. In the illustrated construction, as shown in Figs. 3 and 5, the internal surface portion 46 of the mold surface 30 includes a radially outer portion 90 which is located adjacent and extends radially inwardly of the mold cavity 42 and which is spaced a relatively small distance (e.g.,.01 inches) from the internal surface portion 54 of the mold surface 38. The internal surface portion 46 of the mold surface 30 also includes a radially inner portion 94 which is relieved, i.e., which is spaced a greater distance (e.g., between.125 and. 250 inches) from the internal surface portion 54 of the mold surface 38. The conduit 78 preferably extends through the center of the radially inner portion 94 and communicates directly with the space between the radially inner portion 94 and the internal surface portion 54. The space between the radially outer portion 90 and the internal surface portion 54 is wide enough to permit air to flow out of the mold cavity 42 to the conduit 78 but is narrow enough to substantially prevent foam beads from flowing into the space between the surface portions 46 and 54. The increased space between the radially inner portion 94 and the internal surface portion 54 provides improved air flow into the conduit 72.
Various features of the invention are set forth in the following claims.
i t

Claims (21)

1. Apparatus for molding a foam pattern to be used in a lost foam casting process, said apparatus comprising first and second mold pieces defining a mold cavity, and an internal parting area, and means for venting said internal parting area.
2. Apparatus as set forth in Claim 1 wherein said means includes a conduit extending between said internal parting area and the exterior of said apparatus.
3. Apparatus as set forth in Claim 2 wherein said conduit includes one end extending through one of said mold pieces and communicating with said internal parting area.
4. Apparatus as set forth in Claim 3 and further comprising a steam chest supporting said one of said mold pieces, and wherein said conduit is also supported by said steam chest.
5. Apparatus as set forth in Claim 4 and further comprising means for supplying foam beads to said mold cavity.
6. Apparatus a set forth in Claim 3 wherein one of said mold pieces is relieved adjacent said one end of said conduit.
i
7. Apparatus as set forth in Claim 3 wherein said first and second mold pieces include respective first and second internal surface portions defining said internal parting area, wherein said first internal surface portion includes a radially outer portion spaced a first distance from said second internal surface portion, and a radially inner portion spaced a second distance greater than said first distance from said second internal surface portion so as to define a space between said radially inner portion and said second internal surface portion, and wherein said one end of said conduit communicates directly with said space.
8. Apparatus for molding an evaporable foam pattern to be used in a lost foam casting processes., said apparatus comprising first and second mold pieces defining an endless mold cavity, said mold pieces including mating surface portions which are surrounded by said mold cavity and which define therebetween a space, and means for venting said space.
9. Apparatus as set forth in Claim 8 wherein said means includes a conduit extending between said internal parting area and the exterior of said apparatus.
10. Apparatus as set forth in Claim 9 wherein said conduit includes one end extending through one of said mold pieces and communicating with said internal parting area.
1 1 11. Apparatus as set forth in Claim 10 and further comprising a steam chest supporting said one of said mold pieces, and wherein said conduit is also supported by said steam chest.
12. Apparatus as set forth in Claim 8 and further comprising means for supplying foam beads to said mold cavity.
13. Apparatus a set forth in Claim 10 wherein one of said mold pieces is relieved adjacent said one end of said conduit.
14. Apparatus as set forth in Claim 10 wherein said first and second mold pieces include respective first and second internal surface portions defining said internal parting area, wherein said first internal surface portion includes a radially outer portion spaced a first distance from said second internal surface portion, and a radially inner portion spaced a second distance greater than said first distance from said second internal surface portion so as to define a space between said radially inner portion and said second internal surface portion, and wherein said one end of said conduit communicates directly with said space.
15. Molding apparatus comprising first and second mold pieces defining a mold cavity and including respective first and second internal surface portions defining an internal parting area, said first internal surface portion including a radially outer portion spaced a first distance from said second internal surface portion, and a radially inner portion spaced a second distance greater than said first distance from said second internal surface portion so as to define a space between said radially inner portion and said second internal surface portion, and means for venting said space.
16. Apparatus as set forth in Claim 15 wherein said means includes a conduit extending between said space and the exterior of said apparatus.
17. Apparatus as set forth in Claim 16 wherein said conduit includes one end extending through one of said mold pieces and communicating with said space.
18. Apparatus as set forth in Claim 17 and further comprising a steam chest supporting said one of said mold pieces, and wherein said conduit is also supported by said steam chest.
19. Apparatus as set forth in Claim 18 and further comprising means for supplying foam beads to said mold cavity.
P p 1 0 3
20. Apparatus as set forth in Claim 17 wherein said one end of said conduit communicates directly with said space.
21. Molding apparatus substantially as hereinbefore described with reference to the accompanying drawing.
Published 199, n, The Paten, Office. Concept House Cardiff Road. Newport. Giveni NP9 I RH- Further copies may be obtained frorn Sales Branch. Unit 6. Nine Mile Point Cik-mfelinfa, 1 Iross Keys- Newport. NPI 7HZ. Printed by Multiplex techniques lid. SI Cray- Kent
GB9102860A 1990-04-02 1991-02-11 Apparatus for molding lost foam pattern sections Expired - Fee Related GB2242644B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US50412190A 1990-04-02 1990-04-02

Publications (3)

Publication Number Publication Date
GB9102860D0 GB9102860D0 (en) 1991-03-27
GB2242644A true GB2242644A (en) 1991-10-09
GB2242644B GB2242644B (en) 1993-07-21

Family

ID=24004932

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9102860A Expired - Fee Related GB2242644B (en) 1990-04-02 1991-02-11 Apparatus for molding lost foam pattern sections

Country Status (6)

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JP (1) JPH04223122A (en)
BE (1) BE1004254A5 (en)
CA (1) CA2036009A1 (en)
DE (1) DE4109940A1 (en)
GB (1) GB2242644B (en)
IT (1) ITRM910149A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994009960A1 (en) * 1992-11-02 1994-05-11 Wesley-Jessen Corporation Method for removing excess lens forming material
US5482721A (en) * 1992-09-02 1996-01-09 Woodbridge Foam Corporation Mold having vent passageways to obviate trimming of flash
GB2291376A (en) * 1994-07-21 1996-01-24 Portakabin Ltd Method of and apparatus for making a building panel
EP3202548A4 (en) * 2014-09-30 2017-10-04 Panasonic Intellectual Property Management Co., Ltd. Injection molding die

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4201096C2 (en) * 1992-01-17 1994-02-24 Grauf Guenter Mold for the production of foam moldings
DE19500601C2 (en) * 1995-01-11 1998-11-05 Notar Walter Method and device for producing molded parts from foamed plastic and their use
CN104439058A (en) * 2014-12-06 2015-03-25 沈阳工业大学 Lost foam white type manufacturing mold for agricultural power shovel point

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB667861A (en) * 1949-08-04 1952-03-12 Wingfoot Corp Venting of foamed latex molds

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2327268A1 (en) * 1973-05-29 1975-01-02 Otto Waldmann METHOD AND DEVICE FOR MANUFACTURING SHAPED BODIES FROM EXPANDABLE POLYSTYRENE FOAM
DE2544714A1 (en) * 1975-10-07 1977-04-21 Hans Erlenbach DEVICE FOR THE PRODUCTION OF MOLDINGS FROM FOAMABLE THERMOPLASTIC PLASTIC
JPS63247015A (en) * 1987-04-03 1988-10-13 Inoue Mtp Co Ltd Mold for reaction injection molding
JPS63309416A (en) * 1987-06-12 1988-12-16 Toyota Motor Corp Vacuum drawing injection molding device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB667861A (en) * 1949-08-04 1952-03-12 Wingfoot Corp Venting of foamed latex molds

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5482721A (en) * 1992-09-02 1996-01-09 Woodbridge Foam Corporation Mold having vent passageways to obviate trimming of flash
US5587183A (en) * 1992-09-02 1996-12-24 Woodbridge Foam Corporation Mold having vent passageways to obivate trimming of flash
USRE36572E (en) * 1992-09-02 2000-02-15 Woodbridge Foam Corporation Mold having vent passageways to obviate trimming of flash
WO1994009960A1 (en) * 1992-11-02 1994-05-11 Wesley-Jessen Corporation Method for removing excess lens forming material
GB2291376A (en) * 1994-07-21 1996-01-24 Portakabin Ltd Method of and apparatus for making a building panel
EP0693598A3 (en) * 1994-07-21 1996-10-02 Portakabin Ltd Method of and apparatus for making a "sandwich" building panel
GB2291376B (en) * 1994-07-21 1998-06-10 Portakabin Ltd Method of making a building panel
EP3202548A4 (en) * 2014-09-30 2017-10-04 Panasonic Intellectual Property Management Co., Ltd. Injection molding die
US10538021B2 (en) 2014-09-30 2020-01-21 Panasonic Intellectual Property Management Co., Ltd. Injection mold

Also Published As

Publication number Publication date
ITRM910149A0 (en) 1991-03-05
GB2242644B (en) 1993-07-21
BE1004254A5 (en) 1992-10-20
GB9102860D0 (en) 1991-03-27
CA2036009A1 (en) 1991-10-03
JPH04223122A (en) 1992-08-13
ITRM910149A1 (en) 1991-10-03
DE4109940A1 (en) 1991-10-10

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950211