EP1254731A1 - Spritzgussmethode, -artikel und -maschine - Google Patents

Spritzgussmethode, -artikel und -maschine Download PDF

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Publication number
EP1254731A1
EP1254731A1 EP99947908A EP99947908A EP1254731A1 EP 1254731 A1 EP1254731 A1 EP 1254731A1 EP 99947908 A EP99947908 A EP 99947908A EP 99947908 A EP99947908 A EP 99947908A EP 1254731 A1 EP1254731 A1 EP 1254731A1
Authority
EP
European Patent Office
Prior art keywords
die plate
die
cavity
metal mold
insert
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.)
Withdrawn
Application number
EP99947908A
Other languages
English (en)
French (fr)
Inventor
Rokurou Shimada
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.)
SHIMADA, TAKESHI
Daimaru Kogyo Ltd
Original Assignee
Esumorudo YK
Daimaru Kogyo Ltd
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 Esumorudo YK, Daimaru Kogyo Ltd filed Critical Esumorudo YK
Publication of EP1254731A1 publication Critical patent/EP1254731A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14—Machines with evacuated die cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies

Definitions

  • This invention relates to die casting methods, die cast articles, and die casting machines.
  • heat dissipating plate (heat sink) is mounted onto the IC in close adherence to dissipate the heat generated in the IC to the atmosphere.
  • the heat sink was constructed so that it had a number of heat dissipation fins of sheet form provided with prescribed intervals on one face of a base plate using metals with high thermal conductivity such as aluminum.
  • the heat dissipation fins are made to be as thin as possible, and as much as possible, to improve the heat radiation efficiency by making the contacting area of the heat sink and the atmosphere more extensive.
  • heat sinks provided with a number of heat dissipation pins of thin diameter, and of cylinder or prism form, which are used instead of the heat dissipation fins, to dissipate the heat of an IC of even smaller size, which conducts high-speed processing.
  • heat sinks with heat dissipation fins or heat dissipation pins were manufactured mainly by die cast molding, aluminum extrusion (press molding), or processing by cutting in conventional methods, but the die cast molding was used most often from the standpoint of manufacturing cost.
  • the minimum limit of the thickness of a heat dissipation fin was considered to be a little less than 2mm at the front end, and the minimum limit of the diameter of a heat dissipation pin was considered to be a little over 2mm at the front end.
  • the present invention was devised in view of the above-mentioned conventional problem, and an object of the present invention is to provide a die casting method and a die casting machine that make it easy to form a heat dissipation fin of a thin wall, or a heat dissipation pin of thin diameter, and also to provide die cast articles that are cast by this die casting method.
  • a first invention of a die casting method attains the above-mentioned object with a die casting method, comprising the steps of: arranging an insert die provided with a slit inside a cavity formed on an abutting face between a fixed die plate and a movable die plate, with a front end portion of the slit opening to said movable die plate side, the slit is for forming a plurality of thin wall portions parallel to a direction in which a work-piece is pushed out; arranging a breathable metal mold inside said movable die plate in contact with the front end portion of the slit of said insert die; and pouring molten metal into said cavity, while negative pressure is applied to said breathable metal mold to suck air from a contacting face with an opening at an end portion of the insert die.
  • a second invention of a die casting method attains the above-mentioned object with a die casting method, comprising the steps of: arranging an insert die provided with a hole inside a cavity formed on an abutting face between a fixed die plate and a movable die plate, with a front end portion of said hole opening to said movable die plate side, the hole is for forming a plurality of pins parallel to a direction in which a work-piece is pushed out; arranging a breathable metal mold is arranged inside said movable die plate in contact with the front end portion of said hole of said insert die; and pouring molten metal into said cavity, while negative pressure is applied to said breathable metal mold to suck air from a contacting face with an opening at an end portion of the insert die.
  • a third invention of a die casting method attains the above-mentioned object with a die casting method, comprising the steps of: arranging an insert die provided with a concave portion and a convex portion within this concave portion inside a cavity formed on an abutting face between a fixed die plate and a movable die plate, with a front end portion of said concave portion opening to said movable die plate side, the concave portion is for forming a thin wall portion intersecting at right angles with a direction in which a work-piece is pushed out and the convex portion is for forming a hole for the thin wall portion arranging a breathable metal mold inside said movable die plate, opposing said convex portion; and pouring molten metal into said cavity, while negative pressure is applied to said breathable metal mold to suck air from a surface at said fixed die plate side.
  • a fourth invention of a die casting method attains the above-mentioned object with a die casting method, comprising the steps of: forming a concave portion at a location adjacent to a cavity formed on an abutting face between a fixed die plate and a movable die plate, and on at least one of the abutting surfaces of said fixed die plate and said movable die plate; filling a breathable metal of sheet form into said concave portion; and pouring molten metal into said cavity, while negative pressure is applied to said breathable metal of sheet form to suck air from said abutting face.
  • a first invention of a die cast article attains the above-mentioned object with a cast heat sink article, wherein an insert die for heat sink provided with a slit for forming a plurality of heat dissipation fins parallel to a direction in which a work-piece is pushed out is arranged inside a cavity formed on an abutting face between a fixed die plate and a movable die plate of a die casting machine, with a front end portion of the slit opening to said movable die plate side; a breathable metal mold is arranged inside said movable die plate in contact with the front end portion of the slit of said insert die for heat sink; and said cast heat sink article is formed by pouring molten metal into said cavity and solidifying, while negative pressure is applied to said breathable metal mold to suck air from a contacting face with an opening at an end portion of the insert die.
  • the aforementioned heat dissipation fin can be made to have a thickness of 0.3 to 1.5mm at the front end.
  • a second invention of a die cast article attains the above-mentioned object, with a cast heat sink article, wherein an insert die for heat sink provided with a hole for forming a plurality of heat dissipation pins parallel to a direction in which a work-piece is pushed out is arranged inside a cavity formed on an abutting face between a fixed die plate and a movable die plate of a die casting machine, with a front end portion of said hole opening to said movable die plate side; a breathable metal mold is arranged inside said movable die plate in contact with the front end portion of the hole of said insert die for heat sink; and said cast heat sink article is formed by pouring molten metal into said cavity and solidifying, while negative pressure is applied to said breathable metal mold to suck air from a contacting face with an opening at an end portion of the insert die.
  • the aforementioned heat dissipation pin can be made to have a diameter of 1.0 to 2.0mm at the front end.
  • a third invention of a die cast article attains the above-mentioned object with a sheet metal cast article with apertures; wherein an insert die, provided with a concave portion for forming a thin wall portion intersecting at right angles with a direction in which a work-piece is pushed out and a convex portion inside the concave portion, for forming an aperture on the thin wall portion, is arranged inside a cavity formed on an abutting face between a fixed die plate and a movable die plate of a die casting machine, with said concave portion opening to said movable die plate side; a breathable metal mold is arranged inside said movable die plate, opposing said convex portion; and said sheet metal cast article with apertures are formed by pouring molten metal into said cavity and solidifying, while negative pressure is applied to said breathable metal mold to suck air from a surface on said fixed die plate side.
  • a first invention of a die casting machine attains the above-mentioned object with a die casting machine, comprising: a fixed die plate and a movable die plate with a cavity formed on an abutting face between these die plates; an insert die arranged inside this cavity, and provided with slits for forming a plurality of thin wall portions parallel to a direction in which a work-piece is extruded, the insert die being arranged with a front end of the slit opening to the aforementioned movable die plate side; a breathable metal mold arranged inside the aforementioned movable die plate, in contact with the front end of the aforementioned slit; and negative pressure forming means for applying negative pressure to the aforementioned breathable metal mold to suck air from a contacting surface with the front end of the aforementioned slit, when pouring molten metal into the aforementioned cavity.
  • the aforementioned work-piece is a heat sink
  • the slit of the aforementioned insert die is for forming a heat dissipation fin of the heat sink, and a thickness of the slit can be made to be 0.3 to 1.5mm.
  • the aforementioned breathable metal mold can have a concave portion formed at a backside of a portion opposing the slit of the aforementioned insert die to make it thinner than other portions.
  • a second invention of a die casting machine attains the above-mentioned object with a die casting machine, comprising: a fixed die plate and a movable die plate with a cavity formed on an abutting face between these die plates; an insert die arranged inside this cavity, and provided with holes for forming a plurality of pins parallel to a direction in which a work-piece is extruded, and also arranged with a front end of the hole opening to the aforementioned movable die plate side; a breathable metal mold arranged inside the aforementioned movable die plate, in contact with the front end of the aforementioned hole; and negative pressure forming means for applying negative pressure to the aforementioned breathable metal mold to suck air from a contacting surface with the front end of the aforementioned slit, when pouring molten metal into the aforementioned cavity.
  • the aforementioned work-piece is a heat sink
  • the hole of the aforementioned insert die is for forming a heat dissipation pin of the heat sink, and a diameter of this hole can be made to be 1.0 to 2.0mm at the front end.
  • the aforementioned breathable metal mold can have a concave portion formed at a backside of a portion opposing the aforementioned hole of the aforementioned insert die to make it thinner than other portions.
  • a third invention of a die casting machine attains the above-mentioned object with a die casting machine comprising: a fixed die plate and a movable die plate with a cavity formed on an abutting face between these die plates; an insert die arranged inside this cavity, and provided with a concave portion for forming a thin wall portion intersecting at right angles with the direction in which a work-piece is extruded and a convex portion inside the concave portion, for forming apertures on the thin wall portion; a breathable metal mold arranged inside the aforementioned movable die plate, opposing the aforementioned convex portion; and negative pressure forming means for applying negative pressure to the aforementioned breathable metal mold to suck air from a surface on the aforementioned convex portion side, when pouring molten metal into the aforementioned cavity.
  • the aforementioned breathable metal mold can have a concave portion formed at a backside of a portion opposing the convex portion of the aforementioned insert die, to make it thinner than other portions.
  • a fourth invention of a die casting machine attains the above-mentioned object with a die casting, comprising: a fixed die plate and a movable die plate with a cavity formed on an abutting face between these die plates, and with a concave portion formed adjacent to this cavity on at least one of the abutting surfaces of the aforementioned fixed die plate and movable die plate; a breathable metal of sheet form filled into this concave portion; and negative pressure forming means for applying negative pressure to the aforementioned breathable metal of sheet form to suck air from the aforementioned abutting surface.
  • a die casting machine 10 (general view not shown) according to the embodiment of the present invention has: a fixed die plate 12 and a movable die plate 14 with a cavity 16 formed on an abutting face between these plates; an insert die 18 that is arranged inside this cavity 16 and is provided with slits 18A for forming a plurality of thin wall portions parallel to the direction in which a work-piece is extruded; a breathable metal mold 20 arranged inside the aforementioned movable die plate 14, in contact with front ends of the aforementioned slits 18A; and negative pressure forming means 22 which applies negative pressure to the aforementioned breathable metal mold 20, so that air is sucked from a contacting face with the front ends of the aforementioned slits 18A, when pouring molten metal into the aforementioned cavity 16.
  • Reference symbol 24A in FIG. 1 denotes a guide pin mounted on the fixed die plate 12 side
  • reference symbol 24B denotes a guide pin hole provided on the aforementioned movable die plate 14 side, and into which the aforementioned guide pin 24A is inserted through, in a slidable manner in the axial direction.
  • a runner 26 which communicatively connects with the aforementioned cavity 16, is provided on the aforementioned movable die plate 14, and molten metal is supplied to this runner 26 from a pouring inlet 28 formed on the fixed die plate 12 side.
  • Reference symbol 30 in FIG. 1 denotes a basin, and reference symbol 32 denotes a degassing hole.
  • the aforementioned insert die 18 is for forming a heat sink 34 that has a plurality of cooling fins 34A formed in unity on top of a base plate 34B, as shown in FIG. 2, and a concave portion for base plate 18B is formed continuously, at the end portion of the aforementioned number of slits 18A, on the opposite side of the aforementioned movable die plate 14.
  • the width (gap) at the front end of the aforementioned slit 18A is made to be 0.3 to 1.5mm, and the width at the base side is made wider than the front end, to constitute a draft angle.
  • the aforementioned breathable metal mold 20 is usually used as a metal mold that serves also as a degasser in injection-molding plastic, and it is constituted by metal that has minute communicative connection holes formed throughout its body, such as one formed with spherical powders of stainless steel sintered by hot isostatic pressing, which is known as Hiporas (trade name; manufactured by Kobe Steel, Ltd), or one formed with high alloy gold powder and high alloy short fiber mixed and sintered, for example.
  • Hiporas trademark; manufactured by Kobe Steel, Ltd
  • the aforementioned breathable metal mold 20 is made to have a size that corresponds with the whole extent of the aforementioned insert die 18, and its central portion is arranged to correspond with the aforementioned slits 18A.
  • the aforementioned breathable metal mold 20 is of a planar form, and front ends of vacuum pipes 22A and 22B, which constitute a portion of the aforementioned negative pressure forming means 22, are screwed in and fixed to the upper and lower ends of the mold as shown in FIG. 4. Negative pressure supplied from a negative pressure source 22C such as a vacuum pump is transmitted to the breathable metal mold 20 through the vacuum pipes 22A and 22B, and air is sucked from an end surface of the breathable metal mold 20 on the aforementioned insert die 18 side.
  • a negative pressure source 22C such as a vacuum pump
  • reference symbol 36 denotes an ejector plate
  • reference symbol 38A denotes a spacer block
  • reference symbol 38B and 39 denotes insulating materials.
  • a number of the aforementioned cavities 16 are formed when the size of heat sink 34 is compact, to constitute a so-called multi cavity mold. But in this embodiment, a single cavity mold will be described.
  • the movable die plate 14 When die casting a heat sink 34, shown in FIG. 2, with the aforementioned die casting machine 10, the movable die plate 14 is clamped to the aforementioned fixed die plate 12, and molten metal such as melted aluminum is poured in from the pouring inlet 28 in this state, then necessary pressing-in is conducted, and the molten metal is cooled and solidified inside the cavity 16.
  • gas is generated from the molten metal, and this gas is discharged from the aforementioned degassing hole 32.
  • This gas also passes through the slit 18A of the insert die 18 by the negative pressure applied from the aforementioned vacuum pipes 22A and 22B to the breathable metal mold 20, onto which the front end of the slit 18A is brought into contact. Furthermore, this gas is sucked out of the breathable metal mold 20 by the vacuum pipes 22A and 22B. Therefore, the molten metal goes around to the front ends of the slits 18A, even when their width is narrow.
  • the movable die plate 14 is opened, and the formed heat sink 34 is pushed out by the ejector plate 36 to be brought out as a product.
  • the aforementioned breathable metal mold 20 is made for plastic molding as mentioned before, and there is a possibility in which the mold is melted or damaged by coming into contact with the pressed-in molten metal.
  • the width of the slit 18A is narrow, and the breathable metal mold 20 comes in contact with the molten metal only at the front end portion of the slit 18A, the temperature of the pressed-in molten metal is lowered a great deal when it reaches the location where it contacts the breathable metal mold 20, and the molten metal does not melt or damage the breathable metal mold 20.
  • the thickness of the aforementioned slit 18A is made to be 0.3 to 1.5mm. Therefore, the thickness of the cooling fin 34A of the cast heat sink 34 also becomes 0.3 to 1.5mm.
  • This insert die 44 is provided with holes 44A that are for forming a plurality of pins parallel to the pushing out direction of the work-piece, and a concave portion for base plate 44B that exists in continuity on the base side of the hole 44A.
  • the front end of the hole 44A is arranged to contact the breathable metal mold 20, which is similar to the one mentioned above, provided on the movable die plate 14 side.
  • the diameter of the aforementioned hole 44A at the front end is made to be 1.0 to 2.0mm.
  • a die casting machine 50 for casting a sheet member 48 provided with a plurality of apertures 46, as shown in FIG. 7, will be described next.
  • this die casting machine 50 is provided with: a fixed die plate 52 and a movable die plate 54 with a cavity 56 formed on an abutting face between these plates; an insert die 58 arranged inside this cavity 56, and provided with a concave portion 58A for forming a thin wall portion intersecting at right angles with the direction a work-piece is ejected and a convex portion 58B inside this concave portion 58A, for forming apertures on the thin wall portion; a breathable metal mold 60 that is arranged inside the aforementioned movable die plate 54, opposing the aforementioned convex portion 58B; and negative pressure forming means 22, similar to the one mentioned above, which applies negative pressure to the aforementioned breathable metal mold 60 to suck air from a surface on the aforementioned convex portion 58B side, when pouring molten metal into the aforementioned cavity 56.
  • the gas generated in the casting process is sucked and discharged from the front end of the convex portion 58B, which is the portion that will become the aperture 46 of the sheet member 48, by the breathable metal mold 60.
  • molten metal flows easily into the concave portion 58A, which is the portion where the sheet metal is formed, and into which it is difficult to make the molten metal go around, and it is possible to surely die cast mold a sheet member 48.
  • the breathable metal mold 60 does not get melted or damaged, because the molten metal does not flow into the convex portion 58.
  • a defect will generate in the sheet member 48, when the aforementioned breathable metal mold 60 is installed at a location opposing the concave portion 58A of the aforementioned insert die 58, because gas gathers around this place.
  • burr In general, a so-called burr is formed, when molten metal is poured into cavities 16 or 56, such as the ones mentioned above, and pressurized, and not enough degassing is done, because gas gets into the abutting surface between the aforementioned fixed die plates 12 or 52, and the aforementioned movable die plates 14 or 54, and expands this surface, and the molten metal flows into this surface.
  • breathable metal plates 62 made of the same material as the breathable metal mold 20, are arranged outside and adjacent to the cavity 16, and on either one of the aforementioned fixed die plate 12 or movable die plate 14, as shown in a two-dotted chain-line in FIG. 4.
  • the gas which tries to flow in between the fixed die plate 12 and the movable die plate 14 and tries to expand the gap between these plates, is discharged promptly by the negative pressure applied to the breathable metal plate 62 to prevent a generation of burrs.
  • the aforementioned breathable metal plates 62 are made, so that negative pressure can be applied to them from the vacuum pipes 22A and 22B, as in the aforementioned breathable metal mold 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP99947908A 1999-10-14 1999-10-14 Spritzgussmethode, -artikel und -maschine Withdrawn EP1254731A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/005687 WO2001026849A1 (fr) 1999-10-14 1999-10-14 Procede et machine de coulee sous pression, et article coule sous pression

Publications (1)

Publication Number Publication Date
EP1254731A1 true EP1254731A1 (de) 2002-11-06

Family

ID=14237003

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99947908A Withdrawn EP1254731A1 (de) 1999-10-14 1999-10-14 Spritzgussmethode, -artikel und -maschine

Country Status (3)

Country Link
EP (1) EP1254731A1 (de)
CN (1) CN1379702A (de)
WO (1) WO2001026849A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2959691A1 (fr) * 2010-05-07 2011-11-11 Snecma Outillage d'injection d'une piece
JP2012152779A (ja) * 2011-01-25 2012-08-16 Ryobi Ltd ダイカスト用金型及びダイカスト法
DE102013214519A1 (de) * 2013-07-25 2015-01-29 Bayerische Motoren Werke Aktiengesellschaft Druckgussform

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4292224B2 (ja) * 2007-12-14 2009-07-08 株式会社東芝 金型、鋳造品の製造方法
CN102218520B (zh) * 2011-05-26 2013-04-24 哈尔滨工业大学 一种轻合金压铸充填锻造密实一体化成形装置
CN104552790B (zh) * 2012-11-23 2017-04-19 威海威达精密铸造有限公司 一种农机铸件注射成型模具
CN103480821B (zh) * 2013-09-06 2015-11-18 刘鲁斌 数控铣床电机专用散热器的铸造模具
CN106424630B (zh) * 2016-08-19 2019-01-18 浙江大学 复杂薄壁类铝合金件超声辅助半固态压铸成型装置及方法
CN108962851A (zh) * 2018-08-29 2018-12-07 佛山市南海奔达模具有限公司 散热器以及其应用的壳单元、制造散热器的铸造模具
CN112872323A (zh) * 2021-02-26 2021-06-01 深圳市宝田精工科技有限公司 一种光模块模内镶铜压铸成型机构

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JPS5187126A (ja) * 1975-01-28 1976-07-30 Hiroshi Yoshida Kanagatanyoruchuzohoho
JPS6285917A (ja) * 1985-10-11 1987-04-20 Yukikazu Kasuga 成形用砂型を用いた射出成形装置
JPH09162339A (ja) * 1995-12-07 1997-06-20 Janome Sewing Mach Co Ltd Ｌｓｉ用ヒートシンク及びその製造法
JPH10263779A (ja) * 1997-03-24 1998-10-06 Fujikura Ltd ヒートシンクの製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0126849A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2959691A1 (fr) * 2010-05-07 2011-11-11 Snecma Outillage d'injection d'une piece
JP2012152779A (ja) * 2011-01-25 2012-08-16 Ryobi Ltd ダイカスト用金型及びダイカスト法
DE102013214519A1 (de) * 2013-07-25 2015-01-29 Bayerische Motoren Werke Aktiengesellschaft Druckgussform

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Publication number Publication date
WO2001026849A1 (fr) 2001-04-19
CN1379702A (zh) 2002-11-13

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