US3885618A - Ventilation valve for closing a ventilation duct in a casting mold - Google Patents

Ventilation valve for closing a ventilation duct in a casting mold Download PDF

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Publication number
US3885618A
US3885618A US373128A US37312873A US3885618A US 3885618 A US3885618 A US 3885618A US 373128 A US373128 A US 373128A US 37312873 A US37312873 A US 37312873A US 3885618 A US3885618 A US 3885618A
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US
United States
Prior art keywords
valve
piston
ventilation
displacement member
mold
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Expired - Lifetime
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US373128A
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English (en)
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Fritz Hodler
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FONDAREX F HODLER & CIE SA AV DE COLLONGE 28 CH 1820 MONTREAUX A SWISS Corp
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Assigned to FONDAREX F. HODLER & CIE S.A., AV. DE COLLONGE 28, CH 1820 MONTREAUX, A SWISS CORPORATION reassignment FONDAREX F. HODLER & CIE S.A., AV. DE COLLONGE 28, CH 1820 MONTREAUX, A SWISS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HODLER, FRITZ
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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/812—Venting

Definitions

  • a ventilation valve for closing a ventilation duct in a casting mold comprising a valve cylinder; a valve piston slidingly received by the valve cylinder so as to be movable between an open and a closed position in a direction perpendicular with respect to said ventilation duct, said valve closing in the direction of the pressure exerted onto the surface of said piston which faces said ventilation duct, a displacement member which urges the piston into its open position when the mold is open; and means actuated by closure of the mold to move the displacement member away from the piston so that the piston can be brought to its closed position without being hindered by the displacement member load.
  • the present invention relates to a ventilation valve for closing a ventilation du ct in a casting mold, the valve comprising a valve cylinder; a valve piston slidingly received by the valve cylinder so as to be movable between an open and a closed position in a direction perpendicular with respect to said ventilation duct, said valve closing in the direction of the pressure exerted onto the surface of said piston which faces said ventilation duct, a displacement member which urges the piston into its open position when the mold is open; and means actuated by closure of the mold to move the displacement member away from the piston so that the piston can be brought to its closed position without being hindered by the displacement member load.
  • Ventilation valves of this type which compared with those which close in the opposite direction (German Pat. Nos. 1,044,364 and l,458,l36) have the considerable advantage that it is not necessary to apply any particularly high energy to keep them closed when the casting material reaches the valve, since the pressure of the casting material which flows thereafter is sufficient in itself to achieve this.
  • Ventilation valves may not be selected to be of any desired size in order to achieve actuation of the valve piston with a fairly low specific pressure, as, in the case of most casting molds, as a result of the core pressures frequently applied on all sides, there is only very little space available for the introduction or removal of a ventilation valve.
  • the afore-mentioned high pressures which are generally applied by means of hydraulic pressure means lead, however, to expensive, rapidly wearing seals and to a considerable risk of accident, principally because of the possibility that the pressure medium may escape and come into contact with molten metal in the melting pot near the casting machine, and cause explosions.
  • valve piston is housed in a lateral wall of the ventilation duct, and to achieve closing its front face is pressed against the opposite-facing duct wall, and this means that fins may succeed in adhering to the front face of the piston, these occurring as the result of the hardening of liquid casting material forced between the piston and the duct wall which acts as a valve seat. These fins" are difficult to remove in most cases and therefore render impossible satisfactory operation of the valve.
  • the object forming the basis of the invention is therefore to facilitate, in the case of a ventilation valve of the type referred to above, re-opening of the valve without the use of high-pressure pneumatic or hydraulic pressure media even if its piston has jammed in the cylinder as a result of fins which have penetrated between it and the cylinder wall or as the result of the influence of temperature, while bearing in mind that when the mold is closed the valve piston remains in an unstressed condition until its control force acts, so that it is possible to close the ventilation duct with only slight pressure force and in the shortest time possible.
  • the presentinvention provides a ventilation valve for closing a ventilation duct in a casting mold, the valve comprising a valve cylinder; a valve piston slidingly received by the valve cylinder so as to be movable between an open and a closed position in a direction perpendicular with respect to said ventilation duct, said valve closing in the direction of the pressure exerted onto the surface of said piston which faces said ventilation duct, a displacement member which urges the piston into its open position when the mold is open; and means actuated by closure of the mold to move the displacement member away from the piston so that the piston can be brought to its closed position without being hindered by the displacement member load.
  • valve may be re-opened with reliability, even if its piston is jammed as the result of fins or the influences of temperature, in which case the piston is completely relieved of stress when the mold is closed.
  • valve piston is designed as a plunger piston with a sealing piston head and, when housed in a valve cylinder without a valve seat, closes exclusively by means of plunging. In this event it should enter into the valve cylinder to such an extent that its front face, which faces the ventilation duct, is located just inside the bore of the valve cylinder. This means that there is the certainty of avoiding the formation of fins which would otherwise form at the edge of the valve inlet if the latter has been slightly damaged.
  • the impact surface, adapted to be impinged upon by casting material, of the valve head protruding against the cylinder wall of the valve is, in the case of the ventilation valve according to the invention, preferably sectioned in such a way that it protrudes with its radially outer edge in axial alignment of the valve piston against the direction of pressure of the casting material.
  • the casting material exercises such a pressure on the radial protrusion of the valve head that the protrusion is pressed in a sealing manner against the cylinder wall with its lateral edge lying back in the direction of closure of the valve.
  • peripheral wall of the radial protrusion is slightly inclined at the piston head relative to the inner wall of the valve cylinder in such a way that it gradually increases its distance from this cylinder wall in the direction of closure.
  • the pressing of the radial protrusion of the piston head may be made easier or improved further if the radial protrusion has at or near its foot such a narrow cross-section width that it is possible to bend the radial protrusion against the cylinder wall in this area in the event of casting material pressure acting on the front surface of the valve piston.
  • FIG. 1 is an axial section through a ventilation valve housed in a casting mold, the mold being in the open position;
  • FIG. 2 is a view similar to FIG. 1, the valve being open and the casting mold being in the closed position;
  • FIG. 3 is an axial section on an enlarged scale in partial section of the valve head of the closure valve shown in FIGS. 1 and 2;
  • FIG. 4 is an axial section through a second embodiment of the closure valve in the closed position with the casting mold in the closed position.
  • one half 1 of the casting mold has a recess for the reception of the valve cylinder 3 of a ventilation valve, while the other half 2 of the mold contains a ventilation duct 4 adjacent to the plane of separation of this mold.
  • the ventilation duct 4 opens into a pressure distributing area formed in the half 2 of the mold, opposite which lies the valve inlet 16 in the valve cylinder 3, this inlet having a somewhat smaller cross-section; the inlet 16 leads into the cylinder bore 17 which slidably receives the valve piston 5.
  • the piston 5 Behind its piston head 6, which protrudes radially towards the cylinder bore 17 to achieve sealing, the piston 5 has a narrow zone forming with the wall of the cylinder bore 17, a passage 18 for the air which escapes or is to be compressed out of the mold from the mold cavity via the ventilation duct 4. In the narrow zone the valve piston 5 has peripheral guide projections 7 so that it may slide with its piston head 6 with high accuracy in the bore 17 of the valve cylinder 3.
  • the valve piston 5 is designed as a plunger piston which closes exclusively by the entry of its head 6 into the cylinder bore 17.
  • a step-like valve seat at the inner wall of the bore 17 is superfluous, which seat would lead to the formation and collection of fins between piston and cylinder and render trouble-free working of the valve impossible.
  • the valve piston 5 has a piston plate 12 with a substantially greater diameter guided sealingly in a widened part of the cylinder bore 17.
  • this piston plate 12 is pressed to the left (FIG. 1) towards a bearing surface 20 for the piston plate 12 (via mobile stops 19) by a displacement member 9 which is similarly guided in sliding manner in the widened section of the cylinder bore 17.
  • This pressure is achieved by means of plate springs 10, which are compressed between the displacement member 9 and a bolt 11 forming the base of the valve body 3 which attempt to press the displacement member 9 towards the valve piston.
  • the initial stressing of the plate springs 10 is by screwing of the bolt into the valve cylinder to a suitable extent.
  • the stops 19 located between the piston plate 12 and the displacement member 9 are seated at the end of stress-relieving rods 8 which pass through the piston plate and the wall of the valve cylinder 3, and are longitudinally displaceable.
  • the springs 10 press the valve body 5 (through the displacement member 9, stops 19, and piston plate 12) to the left into its open position, in which the piston plate 12 lies against the valve seat 20.
  • the rods 8 are similarly moved in their bores in the valve cylinder, to the left into the position shown in FIG. 1. Their length is such that in this position they project from the valve cylinder 3 by at least the stroke height of the valve piston 5 necessary to close the valve.
  • valve piston 5 which is not solidly connected to the rods 8 or their stops 19, remains in the open position, however. It is as a result no longer subject to any pressure loading of any kind and in the subsequent casting process it may be rapidly moved into its closed position by the entry of a pneumatic or hydraulic pressure medium (as a valve control medium) into the cylinder region 23, in which position it is located a distance 5 (some 0.2 to 0.3 mm) inside the end of the cylinder bore 17 (FIG. 3).
  • a pneumatic or hydraulic pressure medium as a valve control medium
  • the front face of the head 6 of the valve piston 5 which is located in the area of the valve inlet 16 is shaped in such a way that its radially outer edge protrudes obliquely away from the direction of closure of the valve piston 5 (rounded surface 24 in FIG. 3).
  • This oblique protrusion of the edge of the front face of the piston is formed by an annular recess 25 in the front face of the head 6 so that the sealing flange 26 of the piston head 6 has its smallest cross-section at or near its foot 27.
  • the dimensions of this cross-section are such that when pressure from casting material acts on the front face of the head 6, the peripheral edge 28 of the sealing flange 26 is pressed (accompanied by bending in the region of its narrowest cross-section,27)'
  • the sealing flange 26 of the piston head 6 As the liquid casting material may heat the sealing flange 26 of the piston head 6 (more than it does the valve cylinder 3) the sealing flange will also be for this reason pressed against the wall of the cylinder bore 17. Since the opening of the casting mold generally takes place when the casting material and valve piston are still hot, the valve can only be re-opened by a substantial ejection force, this being applied in the example shown in FIGS. 1 and 2 by the compression springs which have been subjected to pronounced initial stress. When the valve is open the valve head may cool off again to a certain extent, i.e., there is an equalization of temperature with the result that in the next casting process the valve can once again be easily closed.
  • FIG. 4 shows the valve piston 5 in the closed position, but in the case of an embodiment which varies from that according to FIGS. 1 and 2 in respect to the depth of blind bore 22 in the nut 11.
  • the depth of the blind bore here is so great that the valve head 6 may enter the cylinder bore 17 further than is necessary to close the ventilation duct 4.
  • the kinetic energy of the casting material which is flowing in the ventilation duct and is suddenly braked when the ventilation duct is closed, may be damped in the additional braking zone thus created, in order to avoid the extremely high pressure peaks which are produced when the casting material is suddenly braked or at least to keep them within acceptable limits.
  • the ventilation valve described above has proven itself under extremely rigid conditions over a satisfactorily long test period and can considerably increase the economics of manufacturing of castings as a result of the elimination of one of the constant sources of disruption.
  • More than one ventilation valve may also be provided for the ventilation duct.
  • one valve may be provided in the half 1 of the mold, the other valve laying opposite this in the half 2 of the mold. It is also possible to connect a shock absorber to the ventilation duct next to the ventilation valve, this shock absorber having the same valve design with displacement member and back-pressure element as the ventilation valve described above.
  • a ventilation valve for closing a ventilation duct in a casting mold comprising a valve cylinder;
  • valve piston slidingly received by the valve cylinder so as to be movable between an open and a closed position in a direction perpendicular with respect to said ventilation duct, said valve closing in the direction of the pressure exerted by casting material onto the surface of said piston which faces said ventilation duct, a displacement member which urges the piston into its open position when the mold is open; and means actuated by closure of themold to move the displacement member away from the piston so that the piston can be brought to its closed position without being hindered by the displacement member load.
  • a ventilation valve as claimed in claim 1, in which said means to move the displacement member comprises at least one slidable member, one end of which bears against the displacement member and the other end of which projects from the valve body so as to be engageable with part of the mold during closure to move the displacement member.
  • a ventilation valve as claimed in claim 4 in which the end of the slidable member which bears against the displacement member is provided with a stop interposed between the piston plate and the displacement member.
  • a ventilation valve as claimed in claim 8 in which the compression spring abuts against a bolt which is screwed into the valve cylinder.
  • valve piston is a plunger piston with a sealing piston head and, when housed in a valve cylinder without a valve seat, closes exclusively by means of plungmg.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Air-Flow Control Members (AREA)
  • Casting Devices For Molds (AREA)
  • Safety Valves (AREA)
US373128A 1972-10-05 1973-06-25 Ventilation valve for closing a ventilation duct in a casting mold Expired - Lifetime US3885618A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1457272 1972-10-05

Publications (1)

Publication Number Publication Date
US3885618A true US3885618A (en) 1975-05-27

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ID=4401965

Family Applications (1)

Application Number Title Priority Date Filing Date
US373128A Expired - Lifetime US3885618A (en) 1972-10-05 1973-06-25 Ventilation valve for closing a ventilation duct in a casting mold

Country Status (14)

Country Link
US (1) US3885618A (de)
JP (1) JPS5715982B2 (de)
AU (1) AU6097373A (de)
BE (1) BE804805A (de)
BR (1) BR7306845D0 (de)
CA (1) CA1020715A (de)
CH (1) CH547138A (de)
ES (1) ES419182A1 (de)
FR (1) FR2201940B1 (de)
GB (1) GB1384853A (de)
IL (1) IL43085A0 (de)
IT (1) IT984140B (de)
NL (1) NL7313613A (de)
SU (1) SU476735A3 (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4239080A (en) * 1977-11-17 1980-12-16 Fritz Hodler Diecasting venting valve
US4352388A (en) * 1981-01-26 1982-10-05 Dbm Industries Limited Die vent for mold cavities
US4489771A (en) * 1980-11-20 1984-12-25 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4492554A (en) * 1980-08-26 1985-01-08 Corn States Metal Fabricators, Inc. Valve unit for a mold vent
US4538666A (en) * 1982-11-09 1985-09-03 Ube Industries, Ltd. Gas venting arrangement incorporated into a mold
US4795331A (en) * 1986-09-15 1989-01-03 The Goodyear Tire & Rubber Company Mold vent plug
US4874308A (en) * 1988-04-04 1989-10-17 Atlas Gary N Vacuum assisted transfer mold and vent pin
US4997026A (en) * 1987-06-05 1991-03-05 Toshiba Kikai Kabushiki Kaisha Gas venting device for molding operations
US5397230A (en) * 1993-08-04 1995-03-14 Gencorp Inc. Vent apparatus for an injection mold
AU674903B2 (en) * 1993-02-02 1997-01-16 Fondarex, F. Hodler & Cie. S.A. A valve assembly for venting diecasting moulds
DE19606160A1 (de) * 1996-02-20 1997-08-21 Bayerische Motoren Werke Ag Kaltkammer-Druckgießmaschine mit einer horizontalen oder schrägen Füllkammer
US6036899A (en) * 1997-01-28 2000-03-14 Bridgestone Corporation Molding die and molding process for synthetic resin molded foam
EP1181998A2 (de) * 2000-08-24 2002-02-27 Bresciani, Edoardo Entzerrer für Zwangsverschluss von Einlassventilen in Druckgiessformen
US20030223912A1 (en) * 2002-05-31 2003-12-04 Urs Knecht Device, system, and method for aspirating liquids from SPE plates
US20040005371A1 (en) * 2002-07-04 2004-01-08 Ahn Myeong Hun Venting apparatus for a tire vulcanizing mold
US6871831B1 (en) * 2003-12-19 2005-03-29 The Goodyear Tire & Rubber Company Mold vent
US20100252713A1 (en) * 2008-01-28 2010-10-07 Masayuki Okano In-mold degassing structure and mold having the structure
CN103922145A (zh) * 2013-01-11 2014-07-16 朱立柱 防堵气动关风器
US20220307607A1 (en) * 2021-03-25 2022-09-29 Honda Motor Co., Ltd. Cap member for shut-off valve, valve element for shut-off valve, method for manufacturing shut-off valve, and method for replacing valve element of shut-off valve

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4431047A (en) * 1979-09-27 1984-02-14 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
JPS60228118A (ja) * 1984-04-26 1985-11-13 Sekisui Chem Co Ltd 射出成形方法
CH710347B1 (de) * 2014-11-07 2018-05-31 Fondarex Sa Ventileinrichtung zum Entlüften von Druckgiessformen.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2867869A (en) * 1957-10-01 1959-01-13 Hodler Fritz Venting device for die casting machines
US2976568A (en) * 1959-03-18 1961-03-28 Anto Diesel Piston Ring Compan Mold cavity venting device
US3349833A (en) * 1963-11-14 1967-10-31 Hodler Fritz Pressure molding venting method
US3433291A (en) * 1965-08-16 1969-03-18 Fritz Hodler Venting of pressure molding apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2867869A (en) * 1957-10-01 1959-01-13 Hodler Fritz Venting device for die casting machines
US2976568A (en) * 1959-03-18 1961-03-28 Anto Diesel Piston Ring Compan Mold cavity venting device
US3349833A (en) * 1963-11-14 1967-10-31 Hodler Fritz Pressure molding venting method
US3433291A (en) * 1965-08-16 1969-03-18 Fritz Hodler Venting of pressure molding apparatus

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4239080A (en) * 1977-11-17 1980-12-16 Fritz Hodler Diecasting venting valve
US4492554A (en) * 1980-08-26 1985-01-08 Corn States Metal Fabricators, Inc. Valve unit for a mold vent
US4489771A (en) * 1980-11-20 1984-12-25 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4352388A (en) * 1981-01-26 1982-10-05 Dbm Industries Limited Die vent for mold cavities
US4538666A (en) * 1982-11-09 1985-09-03 Ube Industries, Ltd. Gas venting arrangement incorporated into a mold
US4795331A (en) * 1986-09-15 1989-01-03 The Goodyear Tire & Rubber Company Mold vent plug
US4997026A (en) * 1987-06-05 1991-03-05 Toshiba Kikai Kabushiki Kaisha Gas venting device for molding operations
US4874308A (en) * 1988-04-04 1989-10-17 Atlas Gary N Vacuum assisted transfer mold and vent pin
AU674903B2 (en) * 1993-02-02 1997-01-16 Fondarex, F. Hodler & Cie. S.A. A valve assembly for venting diecasting moulds
CN1054792C (zh) * 1993-02-02 2000-07-26 丰达雷斯·F·霍德勒有限公司 一种用于压铸模通气的阀门装置
US5397230A (en) * 1993-08-04 1995-03-14 Gencorp Inc. Vent apparatus for an injection mold
US5454991A (en) * 1993-08-04 1995-10-03 Gencorp Inc. Vent system for liquid molding
DE19606160A1 (de) * 1996-02-20 1997-08-21 Bayerische Motoren Werke Ag Kaltkammer-Druckgießmaschine mit einer horizontalen oder schrägen Füllkammer
US6036899A (en) * 1997-01-28 2000-03-14 Bridgestone Corporation Molding die and molding process for synthetic resin molded foam
EP1181998A2 (de) * 2000-08-24 2002-02-27 Bresciani, Edoardo Entzerrer für Zwangsverschluss von Einlassventilen in Druckgiessformen
EP1181998A3 (de) * 2000-08-24 2002-03-06 Bresciani, Edoardo Entzerrer für Zwangsverschluss von Einlassventilen in Druckgiessformen
US20030223912A1 (en) * 2002-05-31 2003-12-04 Urs Knecht Device, system, and method for aspirating liquids from SPE plates
US20040005371A1 (en) * 2002-07-04 2004-01-08 Ahn Myeong Hun Venting apparatus for a tire vulcanizing mold
US6923629B2 (en) * 2002-07-04 2005-08-02 Hankook Tire Co., Ltd. Venting apparatus for a tire vulcanizing mold
US6871831B1 (en) * 2003-12-19 2005-03-29 The Goodyear Tire & Rubber Company Mold vent
US20100252713A1 (en) * 2008-01-28 2010-10-07 Masayuki Okano In-mold degassing structure and mold having the structure
US7833003B2 (en) * 2008-01-28 2010-11-16 Kabushiki Kaisha Saito Kanagata Seisakusho In-mold degassing structure and mold having the structure
CN103922145A (zh) * 2013-01-11 2014-07-16 朱立柱 防堵气动关风器
US20220307607A1 (en) * 2021-03-25 2022-09-29 Honda Motor Co., Ltd. Cap member for shut-off valve, valve element for shut-off valve, method for manufacturing shut-off valve, and method for replacing valve element of shut-off valve
US11549592B2 (en) * 2021-03-25 2023-01-10 Honda Motor Co., Ltd. Cap member for shut-off valve, valve element for shut-off valve, method for manufacturing shut-off valve, and method for replacing valve element of shut-off valve

Also Published As

Publication number Publication date
BR7306845D0 (pt) 1974-08-15
FR2201940B1 (de) 1976-11-19
SU476735A3 (ru) 1975-07-05
CA1020715A (en) 1977-11-15
CH547138A (de) 1974-03-29
JPS4973329A (de) 1974-07-16
IL43085A0 (en) 1973-11-28
FR2201940A1 (de) 1974-05-03
DE2249417A1 (de) 1974-04-11
BE804805A (fr) 1974-01-02
ES419182A1 (es) 1976-04-16
DE2249417B2 (de) 1977-06-23
JPS5715982B2 (de) 1982-04-02
AU6097373A (en) 1975-04-10
GB1384853A (en) 1975-02-26
IT984140B (it) 1974-11-20
NL7313613A (de) 1974-04-09

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Legal Events

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AS Assignment

Owner name: FONDAREX F. HODLER & CIE S.A., AV. DE COLLONGE 28,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HODLER, FRITZ;REEL/FRAME:005249/0100

Effective date: 19890914