EP2209575A1 - Évent pour un dispositif de moulage sous pression - Google Patents

Évent pour un dispositif de moulage sous pression

Info

Publication number
EP2209575A1
EP2209575A1 EP08785131A EP08785131A EP2209575A1 EP 2209575 A1 EP2209575 A1 EP 2209575A1 EP 08785131 A EP08785131 A EP 08785131A EP 08785131 A EP08785131 A EP 08785131A EP 2209575 A1 EP2209575 A1 EP 2209575A1
Authority
EP
European Patent Office
Prior art keywords
projections
flow
mold cavity
ventilation device
casting 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.)
Withdrawn
Application number
EP08785131A
Other languages
German (de)
English (en)
Inventor
Jörg Gauermann
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.)
Electronics Vertrieb Elektronischer Gerate GmbH
Electronics GmbH Vertrieb elektronischer Geraete
Original Assignee
Electronics Vertrieb Elektronischer Gerate GmbH
Electronics GmbH Vertrieb elektronischer Geraete
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 Electronics Vertrieb Elektronischer Gerate GmbH, Electronics GmbH Vertrieb elektronischer Geraete filed Critical Electronics Vertrieb Elektronischer Gerate GmbH
Publication of EP2209575A1 publication Critical patent/EP2209575A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B22D17/145—Venting means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B22C9/067—Venting means for moulds

Definitions

  • the invention relates to a venting device for a die casting device, which has a mold cavity filled with liquid casting material and a gas suction device connected to the mold cavity for sucking the mold cavity, wherein the venting device comprises a flow labyrinth, the input of which is connectable to the mold cavity and the output of the gas suction device.
  • the invention relates to a die casting device with such venting device.
  • Die casting devices are known for example from DE 20 2005 019288 Ul. They have a mold cavity into which liquid casting material, for example an aluminum or magnesium melt, can be pressed. In order to avoid that in the initially liquid and then within a very short time curing casting material bubbles are included, by which the quality of the produced casting could be impaired, the mold cavity can be sucked by means of a Gasabsaugvorraum. The suction of the mold cavity can take place before and during the filling of the mold cavity. In order to avoid that liquid casting material can emerge from the mold cavity and pass to the gas suction device or to a venting valve upstream of this, a venting device is connected between the mold cavity and the gas suction device and forms a flow labyrinth.
  • liquid casting material for example an aluminum or magnesium melt
  • the inlet may be connected to the mold cavity via a vent channel
  • the outlet of the flow labyrinth may be connected to the gas suction device via a suction line.
  • the mold cavity can be sucked off via the flow labyrinth. If liquid casting material enters the flow labyrinth, it solidifies within the flow labyrinth, so that the flow connection between the mold cavity and the gas suction device is interrupted.
  • venting devices via which the mold cavity can be sucked off and solidifies into the flow labyrinth entering casting material, are also referred to as chilli block systems or washboards.
  • the main task of the gas suction device of a die casting device is to supply a certain amount of air within a short time, ie. H. within a few seconds to evacuate from the mold cavity.
  • the air is sucked out of the mold cavity through relatively narrow gaps.
  • the narrow gaps affect the suction capacity. It has been shown that in many cases, despite the provision of powerful gas suction devices, the mold cavities are only insufficiently evacuated.
  • Object of the present invention is to develop a venting device of the type mentioned in such a way that it allows an improved evacuation of the mold cavity without the risk that liquid casting material may escape from the venting device.
  • This object is achieved in a ventilation device of the type mentioned according to the invention that the flow cross-section of the flow labyrinth is variable. This makes it possible to reduce flow losses within the flow labyrinth during suction of the mold cavity, since a relatively large flow cross-section can be selected for sucking off the mold cavity for the flow labyrinth. The evacuation of the mold cavity can thereby be considerably improved.
  • the flow cross section of the flow labyrinth can be reduced, so that it is ensured that inflowing casting material solidifies reliably within the flow labyrinth.
  • the flow cross-section of the flow labyrinth can be changed by liquid casting material flowing into the flow labyrinth.
  • This makes it possible to choose the flow cross section at the beginning of the casting relatively large in order to suck the mold cavity effectively.
  • the suction process can be carried out until poured into the mold cavity poured material enters the flow labyrinth.
  • the inflowing casting material may then cause the reduction in the flow cross-section of the flow labyrinth, for example, by the inflowing casting material striking a wall portion of the flow labyrinth with great force.
  • the loading of the wall section with the pulse of the inflowing casting material can then be used to reduce the flow cross-section.
  • the flow labyrinth has oppositely disposed first and second protrusions arranged offset from one another in the flow direction and whose distance from one another can be changed.
  • the inflowing casting material undergoes a deflection, wherein a considerable momentum is transmitted to the first and / or second protrusions, so that the protrusions change their relative position and thereby reduce the flow cross section of the flow labyrinth.
  • the first projections are displaceable in the flow direction relative to the second projections.
  • the first projections are thus kept movable, whereas the second projections are fixed.
  • the inflowing casting material hits the first protrusions, they thereby change their position relative to the second protrusions and thereby reduce the flow cross-section of the flow labyrinth.
  • the first projections are held on a movable support.
  • the holder can be designed, for example, in the form of a displaceable carriage which can be moved back and forth between a first end position, in which the flow labyrinth has a relatively large flow cross section, and a second end position, in which the flow labyrinth has a comparatively small flow cross section ,
  • the carriage is held on a linear ar Insertion guide, which may be formed, for example, as a dovetail guide.
  • the first projections can be displaced by liquid casting material flowing into the flow labyrinth. It may, for example, be provided that the first projections are displaceable by the liquid casting material, thereby reducing the flow cross-section of the flow labyrinth.
  • the first projections are displaceable against an elastic restoring force.
  • the first projections can thereby be converted, starting from a rest position they occupy, as long as they are not acted upon by liquid casting material in a working position in which the flow labyrinth has a reduced compared with the rest position flow cross-section.
  • the transition from the rest position to the working position takes place against the action of the elastic restoring force. Does not apply the application of the first projections through the casting material, they automatically take their rest position due to the acting restoring force.
  • first projections can be locked in their working position. It has been found that this simplifies the removal of solidified casting material from the flow labyrinth, since the locking of the first protrusions does not cause the solidified casting material to be subjected to a force load by the elastically prestressed first protrusions.
  • Liquid casting material is usually pressed by means of a press-in piston into the mold cavity, then fills it completely if possible and then flows at very high speed to the inlet of the flow labyrinth.
  • the liquid casting material first meets a fixed and only then to a movable projection, wherein it undergoes a deflection at the Vorspr ⁇ ngen each.
  • the inflowing casting material thus first encounters a fixed projection, where it is deflected and thereby transmits a considerable impulse to the fixed projection.
  • the liquid casting material then encounters at an already reduced speed a movable projection on which it undergoes a renewed deflection, at the same time displacing this movable projection while reducing the flow cross-section of the flow labyrinth relative to the stationary projection.
  • the now significantly slowed down liquid casting material can then meet with another fixed projection, where it is deflected again to then meet again on a movable projection.
  • This process can be repeated several times, wherein the respective deflection of the casting material leads to a movable projection due to the impulse transmission occurring to an additional movement of the movable projections and thus to a further reduction of the flow cross-section of the flow labyrinth.
  • the flow labyrinth is formed by a material that conducts heat as much as possible, since this ensures particularly effective heat removal.
  • this comprises a vent block with a first and a second block part, wherein the first block part is fixable to a first mold half of the die casting apparatus and wherein the second block part is fixable to a second mold half of the die casting apparatus, and wherein the two block parts form a flow channel therebetween, in the first protrusions arranged on the first block part and on the second block part arranged second projections projecting to form a flow labyrinth protrude, wherein the first projections and / or the second projections are movably held on the first and on the second block part.
  • the mold cavity of the die-casting device is usually formed by two mold halves, wherein the first mold half is movable and the second mold half is held stationary, so that after completion of the casting process, the manufactured casting can be easily removed from the mold cavity by the first mold half of the second mold half is moved away.
  • the venting device forms a vent block with two block parts.
  • the first block part may be arranged on the movable mold half and the second block part on the fixed mold half, so that by opening the mold cavity and the arranged between the two block parts flow labyrinth can be opened.
  • the flow labyrinth is formed by the projections arranged on the respective block part, and to change the flow cross-section of the flow labyrinth, the first and / or second projections are held movably on the respective block part.
  • the first and / or second projections are fixed to a holding plate movably mounted on or in the first or second block part.
  • the retaining plate can be in the form of a Be formed slidably mounted, for example by means of a linear guide on or in the respective block part slidably.
  • the retaining plate is displaceable against the action of an elastic restoring force. From the holding plate is due to the acting elastic restoring force automatically taken a first end position, as long as no liquid casting material enters the flow labyrinth. Upon entry of liquid casting material, the holding plate can be displaced from the first end position while reducing the flow cross-section of the flow labyrinth.
  • At least one end position of the holding plate is adjustable.
  • an adjusting element such as an adjusting screw can be used, which forms a stop for the retaining plate, against which the retaining plate is pressed due to the acting elastic restoring force, as long as no casting material enters the flow labyrinth.
  • the position of the first and / or second projections can be detected by means of a measuring transmitter. This allows for improved monitoring and documentation of the casting process, in that in each case a measurement protocol can be made for the cast parts produced, from which the position of the first and / or second projections during the production of the casting can be taken.
  • an electrical signal transmitter can be used, in particular it can be provided that the position of the first and / or second projections by means of a displacement sensor can be detected.
  • the sig nalgeber can be connected via a signal line to a control unit of the die casting device.
  • the holding plate on which the first or second projections are held can be locked. This facilitates the opening of the flow labyrinth to extract solidified casting material therein.
  • the die casting apparatus comprises a mold cavity fillable with liquid casting material and a gas suction device connected to the mold cavity, the venting means being interposed between the mold cavity and the gas exhaustion device.
  • the mold cavity may be connected via a vent channel of the die casting to the inlet of the flow labyrinth of the venting device, and the output of the flow labyrinth may be connected via a suction line to the gas suction device. It is advantageous if a suction valve is connected in the suction line.
  • Figure 1 is a schematic representation of a die casting device according to the invention with a venting device according to the invention
  • Figure 2 is an enlarged view of the venting device of Figure 1 with movable projections in a first end position
  • Figure 3 is an enlarged view of the venting device of Figure 1 with movable projections in a second end position.
  • FIG. 1 shows schematically a die casting apparatus 10 according to the invention, which has a first, movable mold half 11 and a second, fixed mold half 12, which cooperate in the usual way with a mold clamping unit which is known per se and therefore not shown in the drawing.
  • the latter comprises a movable and a fixed platen, which are not shown in the drawing to achieve a better overview and in which each one of the two mold halves 11, 12 is held in a known manner.
  • the mold clamping unit By means of the mold clamping unit, a predeterminable closing force can be exerted on the two mold halves 11, 12.
  • the two mold halves 11, 12 form between them a mold cavity 14, which has the shape of a casting to be cast and into which a casting material, for example a metallic melt, preferably liquid aluminum or magnesium material, can be pressed.
  • the mold cavity 14 has an inlet opening, which is usually referred to as "gate” and is assigned in Figure 1 by the reference numeral 15.
  • the gate 15 is connected via an inlet channel 17 with a casting chamber 18 in connection, which has a filling opening 19 and in which a press-in piston 21 is slidably mounted.
  • the press-in piston 21 is held on a piston rod 22 which is fixed with its end facing away from the press-fitting piston 21 on a working piston 24.
  • the working piston 24 is displaceably supported in a working cylinder 26 of a drive unit, designated overall by the reference numeral 27.
  • the drive unit 27 has a hydraulically coupled to the working cylinder 26 pressure cylinder 29 in which a pressure piston 30 is slidably mounted.
  • the pressure piston 30 On its end face facing the working cylinder 26, the pressure piston 30 carries a pressure pin 31, which dips into the working cylinder 26 on the side of the working cylinder 26 facing away from the piston rod 22.
  • the pressure cylinder 29 is connected via a pressure line 33 with a known per se and therefore not shown in the drawing pressure accumulator in fluid communication, which receives pressurized hydraulic fluid.
  • an electrically controllable control valve 34 is connected in the form of a solenoid valve, by means of which the flow connection between the pressure accumulator, not shown in the drawing and the pressure cylinder 29 can be opened and closed defined.
  • the working cylinder 26 is in fluid communication with a storage tank 37 for hydraulic fluid via an outlet line 36, so that hydraulic fluid can be discharged from the working cylinder 26 to the storage tank 37 via the outlet line 36.
  • the piston rod 22 carries in the longitudinal direction approximately centrally a bushing 39, on which a support arm 40 is fixed, the ends of a measuring ruler 41 carries, which cooperates with a displacement sensor 42.
  • the displacement sensor 42 is connected via a signal line 44 to an electrical control unit 46, to which the control valve 34 is connected via a control line 48.
  • the pressure casting apparatus 10 has a gas suction device 50, which is known per se and therefore only shown schematically in the drawing, which has a venting channel 52 extending from the mold cavity 14, a venting device 55 adjoining the venting channel 52 and an adjoining suction line 57 with the mold cavity 14 in
  • suction line 57 designed as a solenoid valve outlet valve 59 is connected, which is connected via a control line 60 to the control unit 46.
  • the venting device 55 is shown enlarged in Figures 2 and 3. It forms a vent block 62 having a first block part 63 fixed to the movable mold half 11 and a second block part 64 fixed to the fixed mold half 12.
  • the two block parts 63 and 64 form between them a flow channel 66 which adjoins the venting channel 52 and which is connected to the suction line 57 via an outlet channel 67 extending through the second block part 64.
  • the flow channel 66 protrude rib-shaped first projections 69 and also rib-shaped second projections 70 which face each other and are arranged offset to one another in the flow direction, wherein they mesh like a comb and form a flow labyrinth 72 between them.
  • the first projections 69 are fixed to a holding plate 74 by means of a screw connection, which is known per se and therefore not shown in the drawing to achieve a better overview, designed in the manner of a slide and displaceable by means of a linear guide 75, for example a dovetail guide a recess 77 of the first block part 63 is mounted.
  • a linear guide 75 for example a dovetail guide
  • a recess 77 of the first block part 63 is mounted.
  • a push rod 79 the holding plate 74 is acted upon by a compression spring 80 with an elastic return force.
  • the compression spring 80 is arranged in a spring housing 82, which is externally fixed on the side facing away from the movable mold half 11 on the first block portion 63 and which is penetrated by the push rod 79, which carries at its free end a boom 83 which is connected to an electrical displacement sensor 85 cooperates and in the illustrated in Figure 2 first end position of the holding plate 74 rests against a switching contact 86.
  • the displacement sensor 85 and the switching contact 86 are connected to the control unit 46 via signal lines 87 and 88 shown only in part in the drawing to achieve a better overview.
  • a locking device 90 is arranged, which is penetrated by the push rod 79.
  • the locking device 90 has in a known per se and therefore not shown in the drawing manner locking means, for example, clamping means with which the push rod 79 and on this, the support plate 74 and the first projections 79 can be locked in any position.
  • the holding plate 74 is acted upon by the compression spring 80 with a spring force in the direction of the movable mold half 11. With a front side 92 facing away from the push rod 79, the holding plate 74 lies in the position shown in FIG. placed position on an adjustable stop in the form of an adjusting screw 93, which specifies the position of the holding plate 74 and thus also the position of the first projections 69.
  • a temperature sensor 95 is immersed, which is connected via a signal line 96 to the control unit 46.
  • the second projections 70 are immovably fixed to the second block part 64, wherein a known per se and therefore not shown in the drawing screw can be used for their determination also used.
  • the holding plate 74 and thus also the first projections 69 are between the first end position shown in Figure 2, in which the holding plate 74 rests with its end face 92 on the adjusting screw 93, and the second end position shown in Figure 3, in which the end face 92 a Distance to the adjusting screw 93 occupies, back and forth displaced.
  • the first projections 69 occupy a relatively large distance from the second projections 70, so that the flow labyrinth 72 has a relatively large flow cross-section.
  • the flow cross-section of the flow labyrinth 72 decreases. This is particularly clear from Figure 3.
  • a metallic melt is pressed into the mold cavity 14 by means of the press-fit piston 21.
  • the press-in piston 21 assumes a retracted position at the beginning of the casting process, in He who the filling opening 19 releases, so that the metallic melt can be filled into the casting chamber 18. Subsequently, the press-in piston 21 is inserted by means of the drive unit 27 into the casting chamber 18. The path traveled by the press-fit piston 21 can be detected by means of the travel sensor 42.
  • the liquid casting material is conveyed to the gate 15 by means of the press-fit piston 21 and at the same time air and pouring gases are sucked out of the mold cavity 14 via the deaeration channel 52, the flow labyrinth 72, the outlet channel 67 and the suction line 57 by means of the gas suction device 50, the outlet valve 59 is open.
  • the drive unit 27 is activated by the control unit 46 via the control valve 34 such that the press-fit piston 21 within a very short time is pushed further into the casting chamber 18 at high speed and the previously evacuated mold cavity 14 is completely filled with liquid casting material.
  • the liquid casting material 100 finally reaches the inlet 98 of the flow labyrinth 72 and is first deflected by a second projection 70 in order subsequently to strike a first projection 69. This is shown in FIG. In this case, the liquid casting material 100 strikes a first projection 69 at very high speed, to which a considerable impulse is thereby transmitted.
  • the first projection 69 together with the holding plate 74, is displaced against the action of the compression spring 80 in the direction away from the adjusting screw 93, so that the initially considerable flow cross-section of the flow labyrinth 72 through which the mold cavity 14 is aspirated , is reduced. Due to the successive deflections, the liquid G cordmaterial 100 experiences within the flow labyrinth 72, the casting material 100 is decelerated.
  • the casting material 100 which is hardening in the mold cavity 14 can be subjected to a very high pressure by the injection piston 21 for densification of the casting material 100.
  • the mold cavity 14 can be opened by moving the movable mold half 11, wherein the flow labyrinth 72 is opened at the same time, since the fixed to the movable mold half 11 first block member 63 is brought together with the movable mold half 11 at a distance from the second block member 64 ,
  • the casting material 100 hardened within the flow labyrinth 72 can thus be removed from the flow labyrinth 72 in a simple manner.
  • the holding plate 74 can be locked together with the first projections 69 in its second end position shown in Figure 2 by means of the locking device 90, so that the hardened in the flow labyrinth 72 casting material 100 is not subject to any force applied by the first projections 79.
  • the first Block part 63 are moved together with the movable mold half 11 again in the direction of the second block part 64 and in the direction of the fixed mold half 12, so that subsequently a new casting process can be performed.
  • the flow labyrinth 72 Due to the movable mounting of the first projections 69, the flow labyrinth 72 can have a considerable flow cross section at the beginning of a casting process, so that the mold cavity 14 can be reliably evacuated by the gas suction device 50. However, in order to avoid that liquid casting material 100 can flow through the flow labyrinth 72 during the casting process, its flow cross-section can be reduced due to the movable mounting of the first projections 69, wherein the first projections 69 are displaced by the casting material 100, which is in the Flow maze 72 enters. An electrical, hydraulic or pneumatic control of the movement of the first projections 69 can be eliminated thereby.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

L'invention concerne un évent pour un dispositif de moulage sous pression qui présente une cavité de moule remplie de matériau de moulage liquide et un dispositif d'aspiration de gaz relié à la cavité de moule pour l'évacuation de la cavité de moule, sachant que l'évent comprend un labyrinthe d'écoulement dont l'entrée peut être reliée à la cavité de moule et la sortie au dispositif d'aspiration de gaz. L'invention vise à perfectionner l'évent de façon qu'il permette une mise au vide améliorée de la cavité de moule sans risquer que du matériau de moulage liquide puisse s'échapper par l'évent. A cet effet, selon l'invention, la section d'écoulement du labyrinthe d'écoulement peut être modifiée. L'invention concerne en outre un dispositif de moulage sous pression pourvu d'un tel évent.
EP08785131A 2007-11-06 2008-07-26 Évent pour un dispositif de moulage sous pression Withdrawn EP2209575A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007054520A DE102007054520B4 (de) 2007-11-06 2007-11-06 Entlüftungseinrichtung für eine Druckgießvorrichtung
PCT/EP2008/006180 WO2009059650A1 (fr) 2007-11-06 2008-07-26 Évent pour un dispositif de moulage sous pression

Publications (1)

Publication Number Publication Date
EP2209575A1 true EP2209575A1 (fr) 2010-07-28

Family

ID=39832282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08785131A Withdrawn EP2209575A1 (fr) 2007-11-06 2008-07-26 Évent pour un dispositif de moulage sous pression

Country Status (6)

Country Link
US (1) US20100276107A1 (fr)
EP (1) EP2209575A1 (fr)
JP (1) JP2011502051A (fr)
CN (1) CN101883650A (fr)
DE (1) DE102007054520B4 (fr)
WO (1) WO2009059650A1 (fr)

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CN111069560A (zh) * 2018-10-22 2020-04-28 本田技研工业株式会社 流道结构

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DE102010020402B3 (de) * 2010-05-12 2011-09-29 InterGuss Gießereiprodukte GmbH Werkzeugentlüftung
CN101994014A (zh) * 2010-12-08 2011-03-30 西南铝业（集团）有限责任公司 一种在线净化除气装置
CN102728806A (zh) * 2012-06-30 2012-10-17 南京钛白化工有限责任公司 连续铸造抽真空系统
DE102014007020B3 (de) * 2014-05-13 2015-11-19 Everinn International Co., Ltd Formvakuumventilvorrichtung
GB201411680D0 (en) * 2014-07-01 2014-08-13 Rolls Royce Plc Component casting
KR102376487B1 (ko) * 2015-02-12 2022-03-21 삼성전자주식회사 반도체 패키지의 제조 장치 및 그 제조 방법
CN107745106A (zh) * 2017-09-22 2018-03-02 芜湖市鸿坤汽车零部件有限公司 一种汽车金属配件铸造设备
JP7132814B2 (ja) * 2018-10-09 2022-09-07 株式会社エフ・シー・シー 成形装置及びその成形装置による成形方法
CN112743778A (zh) * 2019-10-31 2021-05-04 杨登任 射出模具用的排气件
DE102019133354B3 (de) * 2019-12-06 2020-11-19 InterGuss Gießereiprodukte GmbH Entlüftungsvorrichtung zum Entlüften einer Gießform mit sägezahnförmigem Spalt

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CN111069560A (zh) * 2018-10-22 2020-04-28 本田技研工业株式会社 流道结构
CN111069560B (zh) * 2018-10-22 2021-10-26 本田技研工业株式会社 流道结构

Also Published As

Publication number Publication date
DE102007054520B4 (de) 2013-01-17
WO2009059650A1 (fr) 2009-05-14
US20100276107A1 (en) 2010-11-04
JP2011502051A (ja) 2011-01-20
DE102007054520A1 (de) 2009-05-14
CN101883650A (zh) 2010-11-10

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