US20190321882A1 - Melting unit for a moulding machine and a moulding machine - Google Patents

Melting unit for a moulding machine and a moulding machine Download PDF

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Publication number
US20190321882A1
US20190321882A1 US16/371,877 US201916371877A US2019321882A1 US 20190321882 A1 US20190321882 A1 US 20190321882A1 US 201916371877 A US201916371877 A US 201916371877A US 2019321882 A1 US2019321882 A1 US 2019321882A1
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US
United States
Prior art keywords
melting
melting vessel
area
injection
conductive material
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.)
Abandoned
Application number
US16/371,877
Other languages
English (en)
Inventor
Rainer HOELZL
Andreas Josef Fries
Werner KAPPELMUELLER
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.)
Engel Austria GmbH
Original Assignee
Engel Austria GmbH
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 Engel Austria GmbH filed Critical Engel Austria GmbH
Assigned to ENGEL AUSTRIA GMBH reassignment ENGEL AUSTRIA GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOELZL, RAINER, FRIES, Andreas Josef, KAPPELMUELLER, WERNER
Publication of US20190321882A1 publication Critical patent/US20190321882A1/en
Abandoned 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
    • B22D17/20—Accessories: Details
    • B22D17/28—Melting pots
    • 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
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2038—Heating, cooling or lubricating the injection unit
    • 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
    • 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
    • B22D17/2007—Methods or apparatus for cleaning or lubricating moulds
    • 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
    • B22D17/2015—Means for forcing the molten metal into the die
    • 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
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/203—Injection pistons
    • 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
    • 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
    • B22D17/30—Accessories for supplying molten metal, e.g. in rations

Definitions

  • the invention relates to a melting unit for an injection unit of a moulding machine, an injection unit with such a melting unit, and a moulding machine with such an injection unit.
  • the lateral surface of the melting vessel in the radiation area is interrupted in the form of a slit, in order to allow the electromagnetic field generated by the induction coil to penetrate into the radiation area.
  • This is disadvantageous because it results in an inhomogeneous melting process for the conductive material (usually metal) to be melted and melted conductive material can leak from this slit during the injection.
  • a cooling of at least the material of the melting vessel surrounding the radiation area is imperative.
  • the object of the invention is to provide a generic melting unit, a generic injection unit and a moulding machine in which at least one, preferably all, of the problems discussed above are avoided.
  • the radiation area is that area of the melting vessel which holds the induction coil and in which the electromagnetic field generated by the induction coil acts during operation.
  • the injection area is that area of the melting vessel which includes the delivery opening and which is under the influence of the injection forces resulting from the injection pressure during operation.
  • the non-metallic material of the radiation area can be e.g. graphite, stone (without conductive components to any extent relevant for the formation of eddy currents), ceramic, ceramic alloy or glass.
  • the melting vessel is preferably formed as an elongate body, particularly preferably with a cylindrical or prismatic shape, which has a chamber that is accessible from the outside via a delivery opening.
  • a metal or a material made of a metal alloy is preferably used as the conductive material to be melted.
  • the melting vessel has an uninterrupted lateral surface over its entire length (optionally apart from openings, closed during operation, for windows, sensors or the like). Due to the closed design, the melted conductive material can be injected into the cavity at higher injection speeds, as it is impossible for melted conductive material to leak, or even spurt out, from anywhere other than the delivery opening.
  • the electromagnetic field of the induction coil can penetrate into the radiation area over the entire lateral surface and the conductive material to be melted can heat up homogeneously. Tests were able to demonstrate that less time was needed to achieve complete melting of the conductive material to be melted. The risk of the conductive material to be melted bursting out is also substantially reduced. A cooling of the radiation area is not necessary, as no relevant eddy currents form in the non-metallic material of the melting vessel.
  • the melting vessel preferably has substantially the shape of a tube with a continuous chamber, wherein one end of the tube forms the delivery opening for the melted conductive material.
  • the other end of the tube can be used for the insertion of an injection plunger.
  • the area of the tube extending away from the delivery opening forms the injection area. That area of the tube which is surrounded by the induction coil forms the radiation area, where the melting of the conductive material to be melted takes place.
  • the injection plunger can be arranged outside the radiation area irrespective of the injection process.
  • the chamber of the melting vessel starting from the delivery opening, forms an injection area, a radiation area preferably directly adjoining the latter and a storage area for the injection plunger preferably directly adjoining that.
  • the melting vessel consists of a metallic material in the injection area and consists of a non-metallic material in the radiation area.
  • the metallic material has a higher mechanical resilience, which can be important in the area of the injection area.
  • the tube is composed of an axial portion made of metallic material (which has the delivery opening) and an axial portion made of non-metallic material (in which the induction coil is arranged over a part of the length and the injection plunger is arranged). It can be provided here that in that area where the metallic material butts against the non-metallic material it surrounds the latter in the form of a sleeve.
  • the melting vessel consists of a non-metallic material up to the delivery opening (preferably the melting vessel as a whole).
  • a mechanical strengthening structure is preferably provided at least in the injection area.
  • a dispensing device can be provided, by which a mould-release agent can be applied to the inside of the melting vessel at least in the radiation area, wherein a chemical reaction between the melted conductive material and the non-metallic material of the radiation area can be prevented by the mould-release agent.
  • a contact and resultant undesired chemical reactions of substances possibly contained in the conductive material to be melted with the inside of the melting vessel can hereby be avoided.
  • FIGS. 1 a,b are sectional representations of a detail of a first embodiment of a moulding machine according to the invention and a front view thereof;
  • FIGS. 2 a,b show a first and a second stage of a loading process using the melting unit of FIG. 1 ;
  • FIGS. 3 a - c are, respectively, a side view of a melting vessel of a second embodiment of a melting unit according to the invention, a front view thereof, and a sectional view;
  • FIG. 4 shows the application of a mould-release agent to an inner wall of the melting vessel
  • FIG. 5 is a schematic view of a moulding machine according to the invention.
  • a moulding machine 1 according to the invention is represented schematically in FIG. 5 .
  • a movable moulding platen 14 (the drive for moving the movable moulding platen 14 is not represented) and a stationary moulding platen 13 are arranged on a frame 16 .
  • Rails for guiding the movable moulding platen 14 can be provided, but are not necessary in every design.
  • the stationary moulding platen 13 and the movable moulding platen 14 each carry one mould half 15 .
  • the melted conductive material can be injected into a cavity formed in the mould halves 15 through an injection plunger 11 , which can be moved translationally back and forth by an injection drive 12 .
  • the melted conductive material cools and forms the desired moulded part.
  • the moulded part can be removed from the cavity by means of the delivery device 10 .
  • the delivery device 10 for the conductive material 4 to be melted is mounted on the stationary moulding platen 13 , but could also be arranged elsewhere on the frame 16 or next to the frame 16 independently of it.
  • the injection is effected through the stationary moulding platen 13 .
  • Other configurations are conceivable, such as e.g. an injection between the moulding platens 13 , 14 (L-shaped assembly arrangement or 90-degree arrangement of the injection unit relative to the machine axis).
  • FIGS. 1 to 4 Details regarding embodiments of the melting unit, here formed by the melting vessel 2 , the injection plunger 11 , the injection drive 12 , the induction coil 3 and the delivery device 10 for the conductive material 4 to be melted, can be derived from FIGS. 1 to 4 .
  • the melting vessel 2 is formed in two parts.
  • the embodiment example of FIG. 3 shows a one-part formation of the melting vessel 2 . Independently of the design measures otherwise shown, the melting vessel 2 naturally always has a delivery opening 6 for the melted conductive material.
  • FIG. 1 a shows a detail representation along the section A-A of FIG. 1 b in the area of the melting vessel 2 .
  • the melting vessel 2 is formed substantially tubular (with an uninterrupted lateral surface) and has at the left-hand end in FIG. 1 a a delivery opening 6 , which communicates with the mould half 15 (not represented) arranged on the stationary moulding platen 13 .
  • An opening, into which the injection plunger 11 is inserted, is arranged at the right-hand end in FIG. 1 a .
  • the state after the delivery of the conductive material 4 to be melted here formed as a moulding blank) but still before the conductive material 4 is melted is shown.
  • the melting is effected in a manner known per se (optionally after generation of a vacuum in the melting vessel 2 by a suction device, not represented) by means of the induction coil 3 , which is arranged along an axial portion of the radiation area 5 .
  • the induction coil 3 generates an electromagnetic field, which induces eddy currents in the conductive material 4 to be melted.
  • the Joule heat formed thereby melts the conductive material 4 to be melted.
  • the melting vessel 2 has an injection area 7 , extending from the delivery opening 6 in the direction of the radiation area 5 , which in this embodiment example extends directly to the radiation area 5 .
  • the melting vessel 2 is formed from a non-metallic material (e.g. graphite, stone, glass, ceramic or ceramic alloy) in the radiation area 5 , in which the induction coil 3 is arranged. No, or at least no relevant, eddy currents are induced in this non-metallic material, which is why no cooling of the melting vessel 2 is necessary in the radiation area 5 .
  • the electromagnetic field can penetrate into the radiation area 5 over the entire circumference of the uninterrupted lateral surface and homogeneously heats the conductive material 4 to be melted.
  • the melting vessel 2 is formed from a metallic material in the injection area 7 .
  • a tempering device for tempering (cooling or heating) the injection area 7 could be provided in the injection area 7 , but this is not imperative. It is advantageous that no tempering device is necessary in any case in the injection area 5 . In that area where it butts against the non-metallic material, the metallic material surrounds the latter in the form of a sleeve (this is not strictly necessary, but it increases the mechanical stability of the melting vessel 2 ).
  • the melting vessel 2 is formed over its entire length from a non-metallic material such as graphite, stone, ceramic, ceramic alloy or glass.
  • a mechanical strengthening structure 8 for example a shrink sleeve for the melting vessel 2 is arranged in the injection area 7 . This serves to prevent damage to the melting vessel 2 by forces occurring during the injection in the injection area 7 (which can result from injection pressures of up to 1800 bar).
  • the melting vessel 2 at least in the injection area 7 —could be formed sturdier than is necessary when a mechanical strengthening structure 8 is used.
  • a non-metallic material with a sufficiently high mechanical resilience could be used.
  • FIGS. 2 a section along B-B
  • 2 b section along C-C
  • FIGS. 2 a section along B-B
  • 2 b section along C-C
  • the moulding blank (generally: the conductive material 4 to be melted) is held on a gripper 17 in a tube 18 and inserted into the delivery opening 6 via a robotic arm, not represented, of the delivery device 10 ( FIG. 2 a ).
  • the moulding blank is deposited by the gripper 17 in the radiation area 5 ( FIG. 2 b ).
  • the mould halves 15 are closed.
  • the air contained in the melting vessel 2 can be removed by suction as required. Additionally or alternatively, the melting vessel 2 could be flooded with a protective gas. In both cases the melted conductive material can be prevented from reacting with oxygen contained in the ambient air.
  • a window could be arranged in the melting vessel 2 in order to measure the temperature of the conductive material 4 to be melted through this window. It can thereby be ensured that the conductive material 4 to be melted is in fact completely melted before injection.
  • the necessary process variables e.g. field intensity and exposure time of the electromagnetic field
  • the conductive material 4 to be melted could be inserted into the melting vessel 2 in a form other than that of a moulding blank, e.g. in the form of a powder or granular material.
  • the delivery device 10 could also be formed as shown in EP 3 075 465 A1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US16/371,877 2018-04-19 2019-04-01 Melting unit for a moulding machine and a moulding machine Abandoned US20190321882A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018109322.5 2018-04-19
DE102018109322.5A DE102018109322A1 (de) 2018-04-19 2018-04-19 Aufschmelzeinheit für eine Formgebungsmaschine und Formgebungsmaschine

Publications (1)

Publication Number Publication Date
US20190321882A1 true US20190321882A1 (en) 2019-10-24

Family

ID=68104910

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/371,877 Abandoned US20190321882A1 (en) 2018-04-19 2019-04-01 Melting unit for a moulding machine and a moulding machine

Country Status (4)

Country Link
US (1) US20190321882A1 (de)
KR (1) KR20190122162A (de)
CN (1) CN110385419A (de)
DE (1) DE102018109322A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4347889A (en) * 1979-01-09 1982-09-07 Nissan Motor Co., Ltd. Diecasting apparatus
US20040089435A1 (en) * 2002-11-12 2004-05-13 Shaupoh Wang Electromagnetic die casting
US6742569B2 (en) * 2002-02-21 2004-06-01 Chem-Trend, Inc. Hot melt application of solid plunger lubricant
US20120111522A1 (en) * 2010-11-05 2012-05-10 Bullied Steven J Die casting system machine configurations

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JP3049648B2 (ja) * 1993-12-13 2000-06-05 日立金属株式会社 加圧成形方法および加圧成形機
JP3808167B2 (ja) * 1997-05-01 2006-08-09 Ｙｋｋ株式会社 金型で加圧鋳造成形された非晶質合金成形品の製造方法及び装置
PT963262E (pt) * 1997-01-27 2002-09-30 Allied Signal Inc Metodo para a producao de um cadinho e molde integrados destinados a moldacoes gamma-tial de baixo custo
CN1295045C (zh) * 2002-02-21 2007-01-17 切姆－特伦德有限公司 适于在润滑剂被注入压射缸之前导致相变的带固体润滑剂计量器的压铸机
US6736188B2 (en) * 2002-06-28 2004-05-18 Thixomat, Inc. Apparatus for molding molten materials
JP4688146B2 (ja) * 2005-06-09 2011-05-25 日本碍子株式会社 ダイキャスト装置
JP4688145B2 (ja) * 2005-06-09 2011-05-25 日本碍子株式会社 ダイキャスト装置及びダイキャスト方法
DE102006002341A1 (de) * 2006-01-18 2007-07-26 Kompetenzzentrum Neue Materialien Nordbayern Gmbh Spritzgießwerkzeug
DE102007035757A1 (de) * 2007-07-27 2009-01-29 Joint Solar Silicon Gmbh & Co. Kg Verfahren und Reaktor zur Herstellung von Silizium
CN102451898A (zh) * 2010-10-30 2012-05-16 比亚迪股份有限公司 一种真空熔炼压铸设备
KR20140068246A (ko) * 2011-09-30 2014-06-05 크루서블 인텔렉츄얼 프라퍼티 엘엘씨. 사출 성형 시스템을 사용한 비정질 합금의 사출 성형
CN104668503B (zh) 2013-11-30 2017-05-31 中国科学院金属研究所 一种非晶合金构件铸造成型设备和工艺
CN103639387B (zh) * 2013-12-20 2016-02-24 东莞宜安科技股份有限公司 一种金属真空熔炼压铸成型设备
AT517241B1 (de) 2015-06-08 2017-12-15 Engel Austria Gmbh Formgebungsmaschine und Verfahren zum induktiven Erhitzen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4347889A (en) * 1979-01-09 1982-09-07 Nissan Motor Co., Ltd. Diecasting apparatus
US6742569B2 (en) * 2002-02-21 2004-06-01 Chem-Trend, Inc. Hot melt application of solid plunger lubricant
US20040089435A1 (en) * 2002-11-12 2004-05-13 Shaupoh Wang Electromagnetic die casting
US20120111522A1 (en) * 2010-11-05 2012-05-10 Bullied Steven J Die casting system machine configurations

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Publication number Publication date
KR20190122162A (ko) 2019-10-29
CN110385419A (zh) 2019-10-29
DE102018109322A1 (de) 2019-10-24

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