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WO2003000479A2 - Machine de moulage par transfert possedant des caracteristiques qui facilitent le retrait du culot - Google Patents

Machine de moulage par transfert possedant des caracteristiques qui facilitent le retrait du culot Download PDF

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Publication number
WO2003000479A2
WO2003000479A2 PCT/SG2002/000127 SG0200127W WO03000479A2 WO 2003000479 A2 WO2003000479 A2 WO 2003000479A2 SG 0200127 W SG0200127 W SG 0200127W WO 03000479 A2 WO03000479 A2 WO 03000479A2
Authority
WO
WIPO (PCT)
Prior art keywords
molding machine
transfer molding
cull
sprue
abutment
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/SG2002/000127
Other languages
English (en)
Other versions
WO2003000479A3 (fr
Inventor
Zhen Hua He
Ismail Roslan Bin
Zi Yao Wang
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.)
Advanced Systems Automation Ltd Singapore
Original Assignee
Advanced Systems Automation Ltd Singapore
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 Advanced Systems Automation Ltd Singapore filed Critical Advanced Systems Automation Ltd Singapore
Priority to KR1020037016729A priority Critical patent/KR100641857B1/ko
Priority to AU2002314697A priority patent/AU2002314697A1/en
Publication of WO2003000479A2 publication Critical patent/WO2003000479A2/fr
Publication of WO2003000479A3 publication Critical patent/WO2003000479A3/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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/38—Cutting-off equipment for sprues or ingates
    • 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
    • B29C45/02—Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity

Definitions

  • the present invention relates to mold assemblies.
  • this invention relates to a transfer molding machine with features for enhanced cull removal.
  • Transfer molding machines with molds that form mold cavities are known in the art. Such transfer molding machines are used in a molding process to form moldings that are shaped according to the mold cavities. Molds typically include at least two mold plates that are clamped together during part of the molding process. A mold compound in a molten state is then injected into the mold cavities. When sufficient time has elapsed to cure the mold compound, the mold plates are separated to allow ejection of a molding formed with the mold compound.
  • the mold compound is typically channeled during transfer from a mold pot to a mold cavity using one or more runners. Consequently, when mold plates forming the mold cavity separates, mold compound within the runners or at interfaces between the runners and the mold pot is also cured but forms an undesired molding. Such an undesired molding is commonly referred to as a cull.
  • cull removal is typically a problem for existing transfer molding machines that mold by direct gating.
  • direct gating results in a cull being formed that has one or more protrusions known as sprues. Such sprues may entangle with each other or with parts of the transfer molding machine during removal. Consequently, removal of culls in direct gate molding is limited by the presence of sprues.
  • the present invention seeks to provide a transfer molding machine and a method for cull removal by the transfer molding machine upon curing a molding.
  • the present invention provides a transfer molding machine comprising: at least one mold plate having at least one ejection pin for ejecting at least one cull off from the at least one mold plate in a first direction, each of the at least one ejection pin having a sprue abutment, wherein the sprue abutment comprises a notch, the notch being oriented to enable dislodging of the at least one cull in a second direction away from the sprue abutment, the second direction being substantially normal to the first direction.
  • the present invention provides a method for cull removal by the transfer molding machine upon curing a molding, the method comprising the steps of: separating a plurality of mold plates to degate the molding from at least one gate of one or more of the plurality of mold plates; ejecting at least one cull, associated with the molding, in a first direction using at least one ejection pin having a sprue abutment with a notch; and dislodging the at least one cull in a second direction away from the sprue abutment, the second direction being substantially normal to the first direction and based upon orientation of the notch.
  • FIG. 1 is a simplified cross-sectional view of a transfer molding machine in accordance with a preferred embodiment of the present invention
  • FIG. 2 A, FIG. 2B and FIG 2C are, respectively, an isometric view, a plan view and a side view of a sprue abutment of an ejection pin of the transfer molding machine of FIG. 1;
  • FIG. 3 is a cross-sectional side view of a tapered cavity of the transfer molding machine of FIG. 1;
  • FIG. 4 is a flowchart of a method for cull removal by the transfer molding machine of FIG. 1;
  • FIG. 5 is a side view of the transfer molding machine of FIG. 1 showing a cull removing member
  • FIG. 6A, FIG. 6B and FIG 6C are, respectively, a front view, a side view and a bottom view of the cull removing member. Detailed Description of the Drawings
  • a transfer molding machine and a method for cull removal by the transfer molding machine upon curing a molding in accordance with a preferred embodiment of the invention are described.
  • details are provided to describe the preferred embodiment. It shall be apparent to one skilled in the art, however, that the invention may be practiced without such details. Some of these details may not be described at length so as not to obscure the invention.
  • One advantage of the invention is that the transfer molding machine forms culls. Such culls are less likely to break into debris. Thus, cull removal is enhanced by the invention to thereby alleviate production stoppages caused by removal of cull debris.
  • the transfer molding machine provides for one or more ejection pin.
  • ejection pins comprise features that enable the cull to be formed for easier degating from a molding and dislodging from a mold plate compared with existing transfer molding machines.
  • a further advantage of the invention is that the transfer molding machine provides for automated cull removal for culls having sprues formed as a result of direct gate molding. Hence, entangling of such culls within the transfer molding machine is alleviated.
  • FIG.l a simplified cross-sectional view of a transfer molding machine 10 is shown in accordance with the preferred embodiment of the present invention.
  • the transfer molding machine 10 comprises a transfer mold plate 12, an intermediate mold plate 14 and a complementary mold plate 16.
  • Products that require molding are conveyed in a throughput direction, indicated by an arrow 18, through the transfer molding machine 10.
  • Such products can be, for example, semiconductor dies (not shown) disposed on a tape 20.
  • the transfer mold plate 12 has at least one ejection pin of which two ejection pins 22,24 are illustrated in FIG. 1.
  • the ejection pins 22,24 protrudes out of a surface 25 of the transfer mold plate 12 when ejecting a cull.
  • a mold compound (not shown) is injected from a mold pot 26 using a transfer plunger 28.
  • the transfer plunger 28 pushes the mold compound from the mold pot 26 into a cull cavity 30 formed on the intermediate mold plate 14.
  • the intermediate mold plate 14 also has two tapered cavities 32,34.
  • the tapered cavities 32,34 respectively couples the cull cavity 30 to two mold cavities 36,38 of the intermediate mold plate 14.
  • the ejection pins 22,24 are for ejecting a cull off from the transfer mold plate 12 in a first direction indicated by an arrow 40 upon forming a molding with the mold, compound.
  • the ejection pin 22 and the tapered cavity 34 are illustratively used as examples to describe details respectively associated therewith.
  • the ejection pin 22 has a sprue abutment 50 that comprises a notch 52.
  • the notch 52 is oriented to enable dislodging of a cull in a second direction indicated by an arrow 54 away from the sprue abutment 50.
  • the second direction is substantially normal to the first direction.
  • the notch 52 comprises a first surface 56 that is obliquely oriented relative to the throughput direction (indicated by the arrow 18) of the transfer molding machine 10 as illustrated in FIG. 2B.
  • the first surface 56 is inclined at an angle 57 of about fifteen to twenty degrees with respect to a longitudinal axis 58 of the ejection pin 22 as illustrated in FIG. 2C.
  • the notch 52 further comprises an end surface 59 and a second surface 60.
  • the end surface 59 and the second surface 60 are aligned in planes that are substantially normal to the first direction (indicated by the arrow 40).
  • a cull formed upon curing a molding with the transfer molding machine 10 has sprues with end portions (not shown) that abut the sprue abutment 50 of each of the ejection pins 22,24. Each of such end portions complementarily abuts the sprue abutment 50 and therefore has opposing notches to the notch 52.
  • the tapered cavity 34 comprises a sprue gate 70 positioned within a gate portion 72 of the mold cavity 38.
  • the gate portion 72 has a gate depth 74 for excess mold compound that may remain after degating.
  • the gate depth 74 is not more than 0.2mm.
  • a gate land 76 is also indicated at an end portion of the tapered cavity 34.
  • the gate land 76 has a height 78 of not more than 0.1mm.
  • step 104 the transfer mold plate 12, the intermediate mold plate 14 and the complementary mold plate 16 are separated. Separating these mold plates 12,14,16 degates a molding (not shown) from the sprue gates of the tapered cavities 32,34.
  • the notch 52 retains a cull by complementarily engaging sprues (not shown) that are formed from curing mold compound remaining in the cull cavity 30, the tapered cavities 32,34 and the notch 52 of the sprue abutment 50.
  • the notch 52 therefore helps in degating the cull from the molding.
  • the cull is ejected at step 106 in the first direction (indicated by the arrow 40) using the ejection pins 22,24. Ejecting requires the ejection pins 22,24 to be projected out from the transfer mold plate 12 to thereby expose the notch 52 above the top surface 25.
  • each of the ejection pins 22,24 continues to abut to a sprue (not shown) at the sprue abutment 50.
  • the method 100 ends with step 108 in which the cull is dislodged in the second direction (indicated by the arrow 54) away from the sprue abutment 50.
  • the second direction is substantially normal to the first direction (indicated by the arrow 18) and based upon orientation of the notch 52.
  • the dislodging step 108 comprises pushing the cull away from the sprue abutment 50 in the second direction using a cull removing member.
  • the cull removing member is a movable bar 200 shown illustratively in a side view of the transfer molding machine 10.
  • the dislodging step 108 comprises aligning the movable bar 200 with the cull for the pushing.
  • the movable bar 200 has a plurality of stubs 202 that pushes a cull at, for example, runner portions that connect adjacent sprues. Such a pushing action provides a force that dislodges each sprue from each of the sprue abutment 50 in the direction of arrow 54.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne une machine de moulage par transfert (10) comprenant une plaque de moule à injection (12). La plaque de moule à injection comprend des broches d'éjection (22,24) destinées à éjecter le culot dans une première direction (40). Chacune des broches d'éjection (22,24) possède une butée de carotte (50) munie d'une entaille (52). L'entaille est orientée de façon à permettre l'expulsion du culot dans une seconde direction (54), sensiblement perpendiculaire à la première direction (40) et s'éloignant de la butée de carotte (50). L'invention se rapporte à un procédé (100) de retrait du culot par la machine de moulage par transfert (10) après durcissement d'un moulage selon lequel le culot est enlevé de la machine de moulage par transfert (10) à l'aide d'une barre mobile (200) munie d'ergots (202).
PCT/SG2002/000127 2001-06-22 2002-06-21 Machine de moulage par transfert possedant des caracteristiques qui facilitent le retrait du culot Ceased WO2003000479A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020037016729A KR100641857B1 (ko) 2001-06-22 2002-06-21 향상된 컬 제거에 특징이 있는 이동성형장치
AU2002314697A AU2002314697A1 (en) 2001-06-22 2002-06-21 Transfer molding machine with features for enhanced cull removal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG200103824-9 2001-06-22
SG200103824A SG103835A1 (en) 2001-06-22 2001-06-22 Transfer molding machine with features for enhanced cull removal

Publications (2)

Publication Number Publication Date
WO2003000479A2 true WO2003000479A2 (fr) 2003-01-03
WO2003000479A3 WO2003000479A3 (fr) 2003-11-06

Family

ID=20430791

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2002/000127 Ceased WO2003000479A2 (fr) 2001-06-22 2002-06-21 Machine de moulage par transfert possedant des caracteristiques qui facilitent le retrait du culot

Country Status (6)

Country Link
KR (1) KR100641857B1 (fr)
CN (1) CN1295067C (fr)
AU (1) AU2002314697A1 (fr)
SG (1) SG103835A1 (fr)
TW (1) TW537958B (fr)
WO (1) WO2003000479A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7034702B2 (ja) * 2017-12-21 2022-03-14 Ｔｏｗａ株式会社 樹脂成形装置及び樹脂成形品の製造方法
CN116213676A (zh) * 2023-02-15 2023-06-06 苏州广型模具有限公司 一种新能源汽车减震塔脱模结构以及模具

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0970861A (ja) * 1995-09-05 1997-03-18 Kasai Kogyo Co Ltd 射出成形用金型
JP2000015671A (ja) * 1998-06-30 2000-01-18 Matsushita Electric Works Ltd 射出成形用金型装置
JP3797005B2 (ja) * 1999-01-29 2006-07-12 ぺんてる株式会社 射出成形装置の突き出しピンとランナーとの結合構造

Also Published As

Publication number Publication date
WO2003000479A3 (fr) 2003-11-06
KR100641857B1 (ko) 2006-11-03
CN1518492A (zh) 2004-08-04
AU2002314697A1 (en) 2003-01-08
TW537958B (en) 2003-06-21
CN1295067C (zh) 2007-01-17
KR20040014570A (ko) 2004-02-14
SG103835A1 (en) 2004-05-26

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