US3892508A - Casting mould having a ventilation duct - Google Patents

Casting mould having a ventilation duct Download PDF

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Publication number
US3892508A
US3892508A US373141A US37314173A US3892508A US 3892508 A US3892508 A US 3892508A US 373141 A US373141 A US 373141A US 37314173 A US37314173 A US 37314173A US 3892508 A US3892508 A US 3892508A
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US
United States
Prior art keywords
recess
membrane
mold
valve
ventilation
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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.)
Expired - Lifetime
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US373141A
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English (en)
Inventor
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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Expired - Lifetime 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
    • 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

  • the present invention relates to a control device for a ventilation valve in a casting mold, eg for casting metal or plastics.
  • a ventilation valve in a casting mold, eg for casting metal or plastics.
  • the closing of the ventilation duct is intended to prevent liquid casting material reaching the evacuation device which may comprise a special vacuum apparatus, or escaping into the free atmosphere, with which the mold cavity is connected via the ventilation duct, in order to allow the escape of the air which expels by the casting material in the mold cavity during the filling of the mold.
  • thermocouple is provided as a pulse transmitter for controlling the ventilation valve (German Pat. Specification No. l,l74,945).
  • This control device also fails to work with sufficient rapidity as a result of the fact that the thermo-electric current is not produced instantaneously.
  • an electric contact is provided in the ventilation duct instead of the thermocouple, and this sends a control pulse to the ventilation valve.
  • a cloud of vapor is formed at the electrical contact and this prevents the instantaneous giving off of pulses with the result that this then takes place either erratically or too late.
  • the device for giving off pulses for the control of the ventilation valve is a control piston located in the ventilation duct upstream of the ventilation valve, this being actuated by the pressure of the liquid casting material and thus actuating the ventilation valve via power transmission means (Swiss Pat. No. 306,274),
  • the control piston of the control valve sliding in a cylinder can be jammed in the cylinder by means of molten metal forced between the wall of the cylinder and the piston and by the accumulation ofmetal fins formed by this metal, and as a result it may only be removed from the cylinder by dint of blows with a hammer and subsequent cleaning.
  • the object forming the basis of the present invention is therefore, in the case of a control device of the type referred to initially, to remove the disadvantages which have been described, i.e. to guarantee instantaneous actuation of the ventilation valve without the need for an exact and complicated adjustment of an existing pulse transmitting device and avoiding the danger of inability to function as a result of liquid casting material penetrating between moving parts in the form of fins.”
  • the present invention provides a casting mold having a ventilation duct, a ventilation valve in the duct, a recess in communication with the mold cavity, a pressure-sensitive membrane forming part of the wall of the recess, and actuation means responsive to fiexion of the membrane, under the influence of the pressure of casting material entering the recess, to initiate closure of the valve.
  • the actuating means may operate mechanically, pneumatically, hydraulically, and/or electrically. In this way, a sufficiently great control force can be provided for the actuation of the ventilation valve in the shortest time, eg for closing the ventilation valve with a temporal accuracy ofless than 0.00l seconds. It is possible by this means to keep the ventilation duct open until the last possible moment in order to ensure a substantially complete evacuation in the mold cavity.
  • the recess communicating with the mold cavity and having a membrane as a lateral wall may be completely independent of the ventilation duct, and may comprise, for example, a chamber adjacent to the mold cavity or a special duct attached to this cavity. If the membrane is arranged adjacent to the ventilation duct, this duct is expediently widened in the region of the membrane to form a pressure area. In this case the ventilation duct should additionally have in the part between the membrane and the valve outlet, at least locally, a smaller flow cross-section at any point in the part between the membrane and the mold cavity.
  • the membrane prefferably be arranged in the casting mold in such a way that the plane of separation of the parts of the mold lies adjacent to the recess, the membrane extending substantially parallel to the plane of separation. This makes it possible to free the membrane and the recess of solidified casting material after each casting process.
  • FIG. 1 shows a cross-section through part of a casting mold with a control device for a ventilation valve
  • FIG. 2 shows a section along line II-Il of FIG. I;
  • FIG. 3 shows a cross-section through one part of a casting mold with another embodiment of the control device.
  • FIG. 4 shows a section along line l'v'-IV of FIG. 3.
  • one half 9 of the casting mold contains a ventilation duct which consists of two branches 1, 2 and leads to an evacuation device or into the free atmosphere, while the other half 8 of the mold contains the control device for a ventilation valve 13 arranged in the ventilation duct.
  • the arrangement ofthe ventilation duct in the half 9 of the mold is such that one side of the duct coincides with the plane of separation 10 of the two halves 8, 9 of the mold.
  • the re cess 7 has a circular shape in a section extending parallel to the plane of separation 10 and is limited at the side lying opposite the discharge of the branch 1 of the ventilation duct by a pressure-sensitive membrane 3 which is held at its periphery in the plane of the surface of the membrane between a bearing member 4 and a securing ring 5 screwed onto it.
  • the holding force should be such that the membrane can move if there is a thermally/produced change in its radial measurement, without allowing liquid casting material (molten metal) to pass between the membrane and securing ring, and that when impingement of pressure of the liquid casting material reaching into recess 7 has been completed, the membrane may revert to the flat initial position shown in FIG. 1 without permanent deforma tion.
  • the b anch 2 of the ventilation duct has at least locally a smaller cross-section than the branch 1 of this duct leading to the recess 7, so that liquid casting material may pass. in dependence on the filling of the mold cavity, into the recess 7 where it may exert a cumulative pressure on the membrane 3.
  • the membrane 3 bulges to the right [in the drawing) as a result of this pressure until it comes to rest against the support sur' face 15 of the bearing member 4.
  • the membrane 3 displaces a push-rod 6 arranged coaxially in the bearing member 4, this serving to open a hydraulic or pneumatic valve, to close an electrical Contact, or to actuate a lever system, the result of which the closure of the ventilation valve is initiated.
  • FIG. 2 the broken line diagrammatically represents the power transmission system which, as a result of the displacement of the rod 6 by the membrane 3 when the pressure of the casting material impinges on it, initiates the closure of ventilation valve 13 in order to close ventilation ducts 1, 2 and prevent liquid casting material spurting out via the air outlet and reaching the evacuation device of the atmosphere
  • the embodiment of the control device according to the invention shown in H65. 3 and 4 differs from that in H05. 1 and 2 in only a few characteristics.
  • the same reference numerals are used for features which are pre cisely the same in both embodiments.
  • the recess 7 which contains the membrane 3 as a lateral wall forms a connection between the branch 1 emerging from the mold cavity and the branch 2 of the ventilation duct leading to the ventilation valve 13, with the result that casting material which penetrates into duct branch 2 must in every event travel past the pressuresensitive membrane 3.
  • the membrane which is housed in the same way as in the embodiment according to FIGS. 1 and Z is also subjected to a change of shape and to bulging if it experiences, by means of the casting material in the recess 7, a unilateral impingement of pressure, so that it moves the displacement rod 6 to the right in the same way.
  • this rod displaces 4 against the action of a compression spring 16 a valve body 17 (this being in the form of the piston ofa pneumatic or hydraulic control valve for the ventilation valve 13), as a result of which the connection between a conduit 1 coming from a source of pressure: medium and a conduit 12 for conducting the pressure medium to the ventilation valve 13 is opened, this serving to control the ventilation valve.
  • the initial stress on the compression spring 16 may be adjusted by means of a bolt 20. in order to guarantee adequate sealing between the valve piston 17 and the cylinder wall of the bearing member 4, grooves 18 for receiving seals are provided on the periphery of the piston. Pressure medium passing between the displacement rod 6 and the wall of the bore in the bearing body 4 may escape into the atmosphere via leakage air conduit 19, with the result that bulging of the membrane 3 is not obstructed.
  • the branch X from the pressure medium duct 12 indicates that a plurality of ventilation valves 13 may be actuated at one and the same time by the control device.
  • a chamber 21 which serves to hold up the flow of liquid casting material to the ventilation valve 13.
  • a chamber 20 may also be provided in the case of the embodiment of FIGS. 1 and 2 in the duct branch 2.
  • the membrane preferably comprises heat resistant steel. Its thickness preferably increases towards the center point of the membrane. Because of the large diameter of the valve body 17 it is sufficient if the membrane is subjected in its central zone to a movement of only 6.2 mm in the direction of the axis of the membrane in order to release a sufficient quantity of compressed air (pressure medium) for the rapid closure of the ventilation valve. in this case the membrane is subjected to only a very low degree of bending with large bending radii, as a result of which the stress on the membrane remains extra-ordinarily slight.
  • control devices described above ensure that the closure of the ventilation duct by the ventilation valve can take place at the optimum time, for example, only when the liquid metal has already completely filled the mold cavity, without thereby necessitating a large expense in terms of devices or a cumbersome exact adjustment, which is difficult to carry out, of the control member by means of specialists.
  • the configuration is such that collection or penetration of metal fins between parts of the control device which are in relative motion is excluded to a large extent or totally.
  • a casting mold having a ventilation duct, a ventilation valve in the duct, a recess in communication with the mold cavity, a pressure-sensitive membrane forming part of the wall of the recess, and actuating means responsive to flexion of the membrane, under the influence of the pressure of casting material entering the recess, to initiate closure of the valve.
  • a mold as claimed in claim 1 including, adjacent to and spaced from the side of the membrane which is remote from the recess, a rigid support surface for sup porting the depressed membrane.
  • the actuating means includes a displacement member adapted to be displaced by the membrane during deformation, the said member being adjacent to the side of the membrane which is remote from the recess.
  • actuating means further comprises a pneumatic control valve having a displaceable valve body arranged to be displaced by the displacement member.
  • valve body has the same direction of movement as the displacement member and is urged into the closed position against the action of the displacement member.
  • a casting mold having a ventilation duct, a ventilation valve in the duct, a recess in communication with the mold cavity, a pressure-sensitive membrane forming part of the wall of the recess, and actuating means responsive to flexion of the membrane, under the influence of the pressure of casting material entering the recess, to initiate closure of the valve, the recess being in communication with the mold cavity via the ventilation duct, the ventilation duct has in the part between the recess and the valve outlet at least locally a smaller flow cross-section than at any point between the recess and the mold cavity.
  • a casting mold having a ventilation duct, a ventilation valve in the duct, a recess in communication with the mold cavity, a pressure-sensitive membrane forming part of the wall of the recess, and actuating means responsive to the flexion of the membrane, under the influence of the pressure of casting material entering the recess to initiate closure of the valve, wherein the mold is in two parts having a plane of separation, the recess being directly adjacent to this plane, and the membrane extending substantially parallel to this plane.

Landscapes

  • 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)
  • Ventilation (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
US373141A 1972-09-29 1973-06-25 Casting mould having a ventilation duct Expired - Lifetime US3892508A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1426072 1972-09-29

Publications (1)

Publication Number Publication Date
US3892508A true US3892508A (en) 1975-07-01

Family

ID=4399359

Family Applications (1)

Application Number Title Priority Date Filing Date
US373141A Expired - Lifetime US3892508A (en) 1972-09-29 1973-06-25 Casting mould having a ventilation duct

Country Status (14)

Country Link
US (1) US3892508A (enrdf_load_stackoverflow)
JP (1) JPS5626505B2 (enrdf_load_stackoverflow)
AU (1) AU6016473A (enrdf_load_stackoverflow)
BE (1) BE804804A (enrdf_load_stackoverflow)
BR (1) BR7306751D0 (enrdf_load_stackoverflow)
CA (1) CA1011911A (enrdf_load_stackoverflow)
CH (1) CH547137A (enrdf_load_stackoverflow)
ES (1) ES419181A1 (enrdf_load_stackoverflow)
FR (1) FR2201147B1 (enrdf_load_stackoverflow)
GB (1) GB1387368A (enrdf_load_stackoverflow)
IL (1) IL43084A0 (enrdf_load_stackoverflow)
IT (1) IT984103B (enrdf_load_stackoverflow)
NL (1) NL7313459A (enrdf_load_stackoverflow)
SU (1) SU476734A3 (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352388A (en) * 1981-01-26 1982-10-05 Dbm Industries Limited Die vent for mold cavities
US4431047A (en) * 1979-09-27 1984-02-14 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4489771A (en) * 1980-11-20 1984-12-25 Ube Industries, Ltd. Gas-venting arrangement incorporated with a mold
US4538666A (en) * 1982-11-09 1985-09-03 Ube Industries, Ltd. Gas venting arrangement incorporated into a mold
US4997026A (en) * 1987-06-05 1991-03-05 Toshiba Kikai Kabushiki Kaisha Gas venting device for molding operations
WO2004028771A1 (en) * 2002-09-27 2004-04-08 Dubay Richard L Vacuum and vent block for use with molding and casting systems
EP1782935A1 (en) * 2005-11-02 2007-05-09 Kabushiki Kaisha Toshiba Metal mold for resin molding
US20080041552A1 (en) * 2006-08-18 2008-02-21 Dubay Richard L Single-piece cooling blocks for casting and molding
US20080060782A1 (en) * 2006-09-07 2008-03-13 Dubay Richard L Two-stage snap cam system for casting and molding
US20080211129A1 (en) * 2007-03-02 2008-09-04 Dubay Richard L High volume vaccume/vent block for molding and casting systems
US20100252713A1 (en) * 2008-01-28 2010-10-07 Masayuki Okano In-mold degassing structure and mold having the structure
US8424587B1 (en) 2012-06-05 2013-04-23 Richard L. Dubay Vacuum/vent block having non-uniform purge passage
CN109865824A (zh) * 2017-12-05 2019-06-11 重庆英格力铸造科技有限公司 一种高效环保铸造装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5567432A (en) * 1978-11-16 1980-05-21 Matsushita Electric Works Ltd Metal molds for injection molding

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2288642A (en) * 1940-12-17 1942-07-07 Edwin L Powell Automatic bleeder valve
US2293068A (en) * 1940-07-24 1942-08-18 George Automatic Train Control Valve mechanism
US3191233A (en) * 1962-11-30 1965-06-29 Continental Can Co Flow control apparatus
US3349833A (en) * 1963-11-14 1967-10-31 Hodler Fritz Pressure molding venting method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2293068A (en) * 1940-07-24 1942-08-18 George Automatic Train Control Valve mechanism
US2288642A (en) * 1940-12-17 1942-07-07 Edwin L Powell Automatic bleeder valve
US3191233A (en) * 1962-11-30 1965-06-29 Continental Can Co Flow control apparatus
US3349833A (en) * 1963-11-14 1967-10-31 Hodler Fritz Pressure molding venting method

Cited By (19)

* 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
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
US4997026A (en) * 1987-06-05 1991-03-05 Toshiba Kikai Kabushiki Kaisha Gas venting device for molding operations
WO2004028771A1 (en) * 2002-09-27 2004-04-08 Dubay Richard L Vacuum and vent block for use with molding and casting systems
US20040109909A1 (en) * 2002-09-27 2004-06-10 Dubay Richard L. Vacuum and vent block for use with molding and casting systems
US7134637B2 (en) 2002-09-27 2006-11-14 Dubay Richard L Vacuum and vent block for use with molding and casting systems
EP1782935A1 (en) * 2005-11-02 2007-05-09 Kabushiki Kaisha Toshiba Metal mold for resin molding
US20080041552A1 (en) * 2006-08-18 2008-02-21 Dubay Richard L Single-piece cooling blocks for casting and molding
US20080060782A1 (en) * 2006-09-07 2008-03-13 Dubay Richard L Two-stage snap cam system for casting and molding
US7637305B2 (en) 2006-09-07 2009-12-29 Dubay Richard L Two-stage snap cam system for casting and molding
US7806163B2 (en) 2006-09-07 2010-10-05 Dubay Richard L Two-stage SNAP cam pin for casting and molding systems
US20080211129A1 (en) * 2007-03-02 2008-09-04 Dubay Richard L High volume vaccume/vent block for molding and casting systems
US7631851B2 (en) 2007-03-02 2009-12-15 Dubay Richard L High volume vacuum/vent block for molding and casting systems
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
US8424587B1 (en) 2012-06-05 2013-04-23 Richard L. Dubay Vacuum/vent block having non-uniform purge passage
CN109865824A (zh) * 2017-12-05 2019-06-11 重庆英格力铸造科技有限公司 一种高效环保铸造装置

Also Published As

Publication number Publication date
JPS5626505B2 (enrdf_load_stackoverflow) 1981-06-18
IL43084A0 (en) 1973-11-28
IT984103B (it) 1974-11-20
CA1011911A (en) 1977-06-14
FR2201147A1 (enrdf_load_stackoverflow) 1974-04-26
GB1387368A (en) 1975-03-19
NL7313459A (enrdf_load_stackoverflow) 1974-04-02
JPS4972126A (enrdf_load_stackoverflow) 1974-07-12
ES419181A1 (es) 1976-04-01
BE804804A (fr) 1974-01-02
BR7306751D0 (pt) 1974-06-27
CH547137A (de) 1974-03-29
SU476734A3 (ru) 1975-07-05
AU6016473A (en) 1975-03-13
FR2201147B1 (enrdf_load_stackoverflow) 1976-11-19

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Legal Events

Date Code Title Description
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