US20180264543A1 - Valve device for venting die-casting moulds - Google Patents

Valve device for venting die-casting moulds Download PDF

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Publication number
US20180264543A1
US20180264543A1 US15/907,659 US201815907659A US2018264543A1 US 20180264543 A1 US20180264543 A1 US 20180264543A1 US 201815907659 A US201815907659 A US 201815907659A US 2018264543 A1 US2018264543 A1 US 2018264543A1
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United States
Prior art keywords
force
receiving element
valve
valve device
venting
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Abandoned
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US15/907,659
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English (en)
Inventor
Dominik Baumgartner
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Fondarex SA
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Fondarex SA
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Assigned to FONDAREX S.A. reassignment FONDAREX S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAUMGARTNER, DOMINIK
Publication of US20180264543A1 publication Critical patent/US20180264543A1/en
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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
    • B22D17/20—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
    • 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
    • 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
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14—Machines with evacuated die cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D45/00—Equipment for casting, not otherwise provided for
    • B22D45/005—Evacuation of fumes, dust or waste gases during manipulations in the foundry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded

Definitions

  • the invention relates to a valve device for venting die-casting moulds according to the preamble of claim 1 .
  • the casting mould or the mould cavity thereof is made to vent during the casting process to reliably prevent air pockets or gas pockets in the finished cast part. Not only must any air present in the cavities of the casting machine and the casting mould be able to escape, but it must also be ensured that the gases exiting from the liquid casting compound can also escape.
  • a valve device for venting die-casting moulds is known from EP 0 612 573 A2.
  • the valve device has a venting duct for connection to the mould cavity of the die-casting mould, a venting valve arranged in the venting duct, and an actuating device for closing the venting valve.
  • the actuating device comprises a force-receiving element which is actuated by casting material and a force-transmitting element for transmitting the closing movement from the force-receiving element to the venting valve.
  • the valve device is preferably connected to a vacuum system, which allows forced venting of the die-casting mould.
  • DE 27 51 431 A1 discloses a further generic venting valve device for die-casting moulds, which is provided with two venting valves.
  • Each venting valve has an axially displaceable venting piston.
  • the actuating device comprises five actuating pistons which are actuated by casting material and act on an axially displaceable transmission piston, which for its part bears a driver plate.
  • the actuating piston and the transmission piston are arranged below the two venting valves.
  • the driver plate engages interlockingly in an annular groove in the respective venting piston, as a result of which the actuated parts are connected to each other in the manner of drivers.
  • the transmission piston is arranged in an axially movable manner in a cylinder. A pressure medium line coming from a pressure source opens into said cylinder. The operation of the venting valve can thus be checked before the casting process.
  • the object of the invention consists in creating a valve device belonging to the technical field mentioned in the introduction, for venting die-casting moulds, said valve device on the one hand allowing high venting outputs while having a simple structure at the same time, operating reliably and allowing very short closing times.
  • valve device has at least two venting valves and a force-receiving element, which is directly operatively connected to the valve piston of the respective venting valve without a separate intermediate element, provides the fundamental requirement of being able to implement high venting outputs with at the same time very short closing times and comparatively low force effort, since force-transmitting element between the force-receiving element and the respective valve piston can be omitted.
  • the number and mass of the movable elements needed for the process of closing the two venting valves can thus also be reduced, which has the further advantage of the structure of the valve device being comparatively simple and favouring a reliable operation.
  • valve device Preferred developments of the valve device are outlined in dependent claims 2 to 16 .
  • the force-receiving element is arranged centrally between the valve pistons. This favours a compact structure of the valve device and allows a symmetrical structure of the movable parts.
  • valve device has two venting valves, the two valve pistons of which are arranged in a plane with the force-receiving element. This particularly favours a compact structure of the valve device, especially since the two valve pistons are arranged close to the force-receiving element and the force-transmitting parts can be made simple in this embodiment.
  • the force-receiving element is provided with radial protrusions which engage in a cut-out in the respective valve piston or pass through the respective valve piston.
  • This embodiment favours a simple and lightweight structure and allows particularly short closing times.
  • the force-receiving element is formed integrally with the radial protrusions. This embodiment likewise helps to reduce the mass of the movable elements needed for the process of closing the two venting valves further and to make the structure of the valve device simple.
  • the force-receiving element is axially displaceable between a pushed-forward starting position and a pushed-back effective position; the force-receiving element, when in the starting position, tries to hold the valve pistons in a pushed-forward open position, and, when in the effective position, tries to hold the valve pistons in a pushed-back closed position; the force-receiving element is loaded by means of at least one spring in the direction of the starting position of the force-receiving element; the force-receiving element is provided with a pressure face, and the valve device is provided with a pressure space which at least partially surrounds the force-receiving element and is pneumatically loadable to exert a force, directed counter to the spring force, on the pressure face of the force-receiving element and to displace the force-receiving element into the effective position thereof and/or to hold same in the effective position.
  • This embodiment allows direct pneumatic loading of the force-receiving
  • the force-receiving element has a cylindrical main body and a cylindrical head part, the head part having a smaller diameter than the main body, and the end face of the head part projecting into the venting duct.
  • Both the main body and the head part can be easily adapted thereby to the requirements in question. Thanks to the low weight of the elements which are moved for the closing process, the end face of the head part, which is loaded by the liquid casting material, can be kept comparatively small, while the main body can be made correspondingly larger and more robust and is particularly suitable for the radial protrusions to be arranged thereon.
  • Said pressure face is preferably formed on the force-receiving element at the transition from the cylindrical main body to the cylindrical head part. This is a particularly elegant and simple solution for implementing a pressure face for pneumatically loading the force-receiving element.
  • valve device has an outlet chamber, which is integrated into the valve housing and in which the venting duct(s) open, the outlet chamber being connected to a flange which leads outwards.
  • the valve device is provided with a spring-loaded pressure plate which is operatively connected to a plurality of pressure rods, the pressure rods protruding from the front face of the housing when in the starting state; when a sealing plate is fixed to the front face of the housing, the pressure rods push the pressure plate backwards counter to the force of the compression springs, and, when the sealing plate is removed, the pressure plate pushes the force-receiving element together with the valve pistons forwards into the starting position.
  • a spring-loaded pressure plate which is operatively connected to a plurality of pressure rods, the pressure rods protruding from the front face of the housing when in the starting state; when a sealing plate is fixed to the front face of the housing, the pressure rods push the pressure plate backwards counter to the force of the compression springs, and, when the sealing plate is removed, the pressure plate pushes the force-receiving element together with the valve pistons forwards into the starting position.
  • the displaceable elements namely the force-rece
  • the force-receiving element covers an axial distance between 1 and 7 millimetres, in particular between 3 and 5 millimetres, to pass from the starting position to the effective position. This comparatively small distance means that the kinetic energy transmitted from the liquid casting compound to the force-receiving element is kept at a low level.
  • the end face of the head part, which opens into the venting duct, of the force-receiving element preferably has a diameter between 5 and 25 millimetres. This comparatively small diameter or the corresponding area additionally helps to keep the kinetic energy transmitted from the liquid casting compound to the force-receiving element comparatively small.
  • the venting duct has an inlet duct which branches into a number of branches corresponding to the number of venting valves, the force-receiving element being arranged in the region of the branching, and a venting valve being arranged in the region of the end of the respective branch. Thanks to this embodiment, good and fast transmission of the kinetic energy from the liquid casting compound to the force-receiving element is achieved and the respective venting valve can be arranged far away in flow terms from the force-receiving element.
  • the respective branch of the venting duct is provided with at least two, in particular at least three deflections; at least two deflections effect a change in direction of the inflowing casting material by at least 60°.
  • This embodiment helps to slow the speed of the casting material before it meets the respective valve piston.
  • the respective branch of the venting duct is provided with at least one material collection chamber in the form of a dead end for the advancing casting material.
  • This embodiment helps to slow the speed of the casting material so that enough time remains after the casting material meets the force-receiving element for the two valve pistons to close, so that the casting material advances as far as the respective valve piston only when the latter is already in the pushed-back closed position.
  • a block bushing is inserted into the valve housing, said block bushing being made of a harder material than the valve housing and being designed to accommodate and guide the force-receiving element and the valve pistons.
  • a block bushing of this type can be adapted specifically to the requirements, in particular in respect of thermal expansion and wear, and can be changed simply and quickly when necessary.
  • FIG. 1 shows a front view of the valve device
  • FIG. 2 shows a first section through the valve device along line A-A in FIG. 1 ;
  • FIG. 3 shows a second section through the valve device along line B-B in FIG. 1 ;
  • FIG. 4 shows a third section through the valve device along line C-C in FIG. 1 ;
  • FIG. 5 shows a fourth section through the valve device along line D-D in FIG. 1 ;
  • FIG. 6 shows a fifth section through the valve device along line E-E in FIG. 2 ;
  • FIG. 7 shows a section through the valve device together with a sealing plate with open venting valves during the venting process
  • FIG. 8 shows a section through the valve device together with a sealing plate after the two venting valves have been closed.
  • FIG. 1 shows the valve device in a view from the front onto the front face of the valve device. Since the fundamental principle of a valve device of this type is known from EP 0 612 573 A1, only the essential elements thereof and/or parts designed according to the invention are discussed below.
  • the valve device 1 comprises a valve housing 2 , in which a venting duct, which is denoted overall by 3 , is made.
  • the venting duct 3 comprises: an inlet 4 in the form of an inlet duct 5 , which opens into the valve housing 2 at the bottom; two partial ducts in the form of two branches 7 , 8 ; and an outlet in the form of an outlet duct (not visible) which leads upwards out of the valve housing 2 .
  • the venting duct comprises further ducts running inside the housing 2 , which are discussed further below.
  • the inlet duct 5 leading vertically from below into the housing 2 branches in the lower half of the valve housing 2 into the two branches 7 , 8 .
  • an actuating member in the form of a force-receiving element 10 which is actuated by casting material.
  • Each of the said branches 7 , 8 of the venting duct 3 consists of a plurality of partial ducts, a venting valve 18 , 24 being arranged in the region of the end of each branch 7 , 8 .
  • Each venting valve 18 , 24 is provided with a valve piston 19 , 25 which is axially movable between a pushed-forward open position and a pushed-back closed position.
  • the end face of the head part 12 of the force-receiving element 10 can be seen, which can be loaded by the casting material flowing into the venting duct 3 .
  • the force-receiving element 10 is axially displaceable between a pushed-forward starting position and a pushed-back effective position.
  • the force-receiving element 10 is arranged centrally between the two venting valves 18 , 24 and frictionally coupled to the two valve pistons 19 , 25 , as explained in more detail below. From each venting valve 18 , 24 , a duct leads vertically upwards into a common outlet chamber let into the housing 2 .
  • the outlet duct which opens into a flange 33 , leads outwards out of the valve housing 2 .
  • the ducts leading vertically upwards and the outlet chamber cannot be seen in the diagram of FIG. 1 .
  • four pressure rods in the form of tappets 39 are indicated, the function of which is explained in more detail below.
  • the diameter of the head part 12 of the force-receiving element 10 preferably has a diameter between 5 and 25 millimetres.
  • the area of the force-receiving element 10 which can be loaded by the casting material is approximately 19.6 to 490 mm 2 .
  • the loadable area of the force-receiving element 10 is between approx. 50 and 200 mm 2 .
  • the liquid casting material is deflected a total of four to five times in the respective branch 7 , 8 after meeting the force-receiving element 10 or the head part 12 thereof before it advances to the respective venting valve 18 , 24 .
  • the liquid casting material is deflected for the first time into the respective branch 7 , 8 .
  • the liquid casting material is deflected by approximately 140°-160° after meeting the force-receiving element 10 , as a result of which good transmission of the kinetic energy from the liquid casting compound to the force-receiving element 10 is achieved and at the same time the advance of the casting material is decelerated.
  • three of them effect a deflection, i.e. a change in the direction of the inflowing casting material by at least 60°, two of them by at least 90°, the first deflection in the respective branch 7 , 8 effecting a change in the direction of the inflowing casting material by approximately 50°.
  • four material collection chambers 7 a - 7 d ; 8 a - 8 d which receive a certain volume of liquid casting compound and help to slow the advance of the casting material are arranged in the manner of dead ends in each branch 7 , 8 .
  • the formation of the venting duct 3 downstream of the force-receiving element 10 means that the liquid casting material entering the inlet 4 at a speed of approximately 100-150 m/s takes approximately 3 to 5 milliseconds to advance from the force-receiving element 10 to the respective venting valve 18 , 24 .
  • the closing mechanism is dimensioned such that it takes approximately 0.5 to 1.5 milliseconds for the two valve pistons 19 , 25 to be displaced into the closed position after the casting material meets the end face of the head part 12 of the force-receiving element 10 . It is self-evident that the above figures should be understood merely as reference values and can vary on the basis of many parameters.
  • the venting duct 3 has a cross-sectional area of consistent size to conduct or discharge a sufficient gas volume per unit time. With smaller valve device, it can also be sufficient if the casting material is deflected only two or three times and/or if only one or two material collection chambers are provided.
  • the specific weight of the casting material and the entry speed of the casting material can vary in particular depending on the application, these two parameters can also in particular affect the closing time. This circumstance can be taken into account for example by modifying the end face of the head part 12 of the force-receiving element 10 which is loaded with casting material.
  • casting materials are aluminium, magnesium, zinc and brass.
  • the sectional line A-A or sectional plane A-A of the valve device 1 at the same time forms the line of symmetry or the plane of symmetry.
  • the valve device 1 has a symmetrical structure in relation to a plane running through the sectional line A-A.
  • FIG. 2 shows a section through the valve device 1 along line A-A in FIG. 1 ; the force-receiving element 10 is not shown in section.
  • the valve device is in the starting position in which the two venting valves (not visible) are open.
  • the valve housing 2 has two cut-outs 34 , 35 .
  • the front cut-out 35 facing the front face 40 of the valve housing 2 is used to receive a block bushing 46 .
  • the rear cut-out 34 facing the rear of the valve housing 2 is used in particular to receive a pressure plate 37 , which is loaded in the direction of the front face 40 of the housing 2 by means of a plurality of compression springs.
  • the rear cut-out 34 is closed to the rear by means of a cover plate 42 .
  • the cover plate 42 is connected to the housing 2 by means of screw-fastenings. Of the four screw-fastenings in total, only one screw-fastening 55 can be seen in the present diagram.
  • the force-receiving element 10 has a substantially cylindrical main body 11 and a substantially cylindrical head part 12 , the head part 12 having a smaller diameter than the main body 11 .
  • An annular face 16 is formed by the step between the main body 11 and the head part 12 .
  • the force-receiving element 10 is provided on the rear with a cut-out in which a compression spring 54 , which is supported on the cover plate 42 , is partially accommodated. Said compression spring 54 loads the force-receiving element 10 in the direction of the pushed-forward starting position thereof, in which the two venting valves are open.
  • the pressure plate 37 is provided with a cut-out (not visible in this diagram) which is complementary to the contour of the force-receiving element 10 and on the bottom of which the rear of the main body 11 of the force-receiving element 10 can be supported in a frictional manner.
  • another outlet chamber 30 can be seen, which is integrated in the valve housing 2 and is connected to an outwardly opening flange 33 .
  • the inside of the flange 33 is provided with an outlet bore 32 , which is connected to the outlet chamber 30 .
  • two tappets 39 protruding from the front face 40 can be seen, the function of which is explained in more detail below.
  • a duct 58 leads from the top into the housing 2 .
  • This duct 58 opens via a radial bore into a central inner space of the block bushing 46 , which is used to accommodate the force-receiving element 10 .
  • a pressure space 59 is formed in the block bushing 46 between the annular face 16 of the force-receiving element 10 and the front end of the inner space of the block bushing 46 . If the pressure plate 37 is in the pushed-back position thereof, the application of pressure to the pressure space 59 can move the force-receiving element 10 out of the pushed-forward starting position shown here into the pushed-back effective position thereof, in which the two venting valves are closed.
  • Application of pressure to the pressure space 59 can thus displace the force-receiving element 10 backwards in the direction of the cover plate 42 , counter to the force of the compression spring 54 , into the effective position of the force-receiving element and/or hold the force-receiving element in the effective position.
  • the block bushing 46 is produced from a temperature-resistant and wear-resistant material which is harder than the valve housing 2 .
  • the block bushing 46 is replaceable; for example, cold-formed steel is a suitable material for the block bushing 46 .
  • FIG. 3 shows a section through the valve device 1 along line B-B in FIG. 1 ; the valve piston 19 is not shown in section.
  • two of a total of four compression springs 38 can be seen, by means of which the pressure plate 37 is loaded in the direction of the front face 40 .
  • the pressure plate 37 bears against the bottom of the rear cut-out 34 in the housing 2 under the force of the springs 38 .
  • the section is placed such that one of a total of four rod-shaped pressure rods 39 can be seen, which protrude from the front face 40 of the housing 2 . All four pressure rods 39 are connected frictionally to the pressure plate 37 .
  • the sealing plate When a sealing plate (not visible in this diagram) is fixed to the front face 40 of the housing 2 , the sealing plate displaces the four pressure rods together with the pressure plate 37 backwards in the direction of the rear cover plate 42 , counter to the force of the compression springs 38 . This causes the pressure plate 37 to lift up from the rear of the force-receiving element so that the latter can be pushed a few millimetres backwards into the effective position under the effect of the force of the casting material, as is explained below.
  • the block bushing 46 is provided in the region of the venting valve 18 with a vertically upwardly leading bore 52 , which opens into a vertically upwardly leading duct 20 .
  • the bore 52 together with the duct 20 form a further part of the venting duct and lead into the common outlet chamber 30 .
  • the front of the block bushing 46 which faces the front face 40 , comes to bear tight against the bottom of the front cut-out 35 .
  • the block bushing 46 is larger in both height and width than the openings 9 , 17 , 23 ( FIG. 1 ) provided in the bottom of the venting duct 3 , 7 , 8 for the force-receiving element 10 and the two valve pistons 19 , 25 .
  • FIG. 4 shows a section through the valve device 1 along line C-C in FIG. 1 . From this section, which runs centrally through the force-receiving element 10 and the two valve pistons 19 , 25 of the two venting valves, it can be seen that radial protrusions 14 , 15 are formed on the main body of the force-receiving element 10 .
  • the term radial protrusions 14 , 15 means protrusions which extend outwards in a radial direction or project radially in relation to the longitudinal centre axis of the force-receiving element 10 or in relation to the cylindrical lateral surface thereof.
  • These radial protrusions 14 , 15 preferably run at an angle of at least approximately 90° to the longitudinal centre axis of the force-receiving element 10 .
  • the force-receiving element 10 is formed integrally with the radial protrusions 14 , 15 and is preferably produced from hardened steel.
  • the two radial protrusions 14 , 15 each engage in one slot-shaped cut-out 21 , 27 in the respective valve piston 19 , 25 and mechanically couple the force-receiving element 10 directly to the respective valve piston 19 , 25 . Because the force-receiving element 10 is coupled directly to the two valve pistons 19 , 25 , separate coupling elements do not have to be provided.
  • the force-receiving element 10 is thus directly operatively connected to the valve pistons 19 , 25 of the respective venting valve 18 , 24 without a separate intermediate element.
  • the respective cut-out 21 , 27 in the present example passes through the valve piston 19 , 25 , designs in which the cut-out does not pass through are also conceivable.
  • the symmetrical structure of the valve device 1 can be seen in this diagram. This embodiment means that no driver plate, as known in the valve devices from the prior art, needs to be provided. The advantages resulting from this embodiment are explained in more detail below.
  • the block bushing 46 is provided with two cylindrical bores 47 , 48 for accommodating and guiding the two valve pistons 19 , 25 .
  • a cut-out for accommodating the force-receiving element 10 is made in the block bushing 46 .
  • This central cut-out comprises two cylindrical bores 50 , 51 , the front bore 50 being used to accommodate the head part of the force-receiving element 10 , and the rear bore 51 being used to accommodate most of the main body of the force-receiving element 10 .
  • FIG. 5 shows a section through the valve device 1 along line D-D in FIG. 1 ; the two upper pressure rods 39 are not shown in section. Of the four pressure rods 39 , the two upper ones are completely visible, while only the part of the two lower ones which projects from the front face 40 of the housing 2 can be seen. In addition, two of the four compression springs 38 and two of the four screw-fastenings 55 which fix the rear cover plate 42 to the housing 2 can be seen. The two ducts 20 , 26 , which are let into the housing 2 , form a part of the venting duct and lead upwards into the outlet chamber, can also be seen.
  • FIG. 6 shows a section through the valve device 1 along line E-E in FIG. 2 ; the force-receiving element 10 is not shown in section.
  • one duct 20 , 26 leads upwards into the common outlet chamber 30 .
  • the flange 33 is screwed into the housing 2 from above and can be connected to the suction line of a vacuum system (not shown).
  • a filter (not shown) can also be attached to the flange 33 if necessary.
  • FIG. 7 shows the valve device 1 in a section along line C-C in FIG. 1 ; the venting duct 3 including the branches 7 , 8 thereof are closed off and sealed to the front by means of a sealing plate 56 , also referred to as a compensator, which is attached to the front face 40 of the housing 2 .
  • the means used for fixing the sealing plate 56 are not shown in detail. Fixing the sealing plate 56 pushes the four pressure rods together with the pressure plate 37 backwards in the direction of the rear cover plate 42 , counter to the force of the compression springs. This causes the pressure plate 37 to lift up from the force-receiving element 10 so that the latter can be pushed backwards under the effect of the casting material flowing into the venting duct 3 .
  • the inlet 4 or inlet duct 5 of the valve device 1 is connected to the mould cavity to be vented of the die-casting mould, while the outlet duct or flange is attached to a suction device (not visible).
  • a suction device not visible.
  • gases can flow out of the two branches 7 , 8 of the venting duct 3 , past the two valve pistons 19 , 25 , into the common outlet chamber, and from there via the outlet out of the valve device 1 to the outside.
  • the flow direction of the gases is indicated by means of arrows X.
  • the gases flow from the inlet duct via the two branches 7 , 8 of the venting duct and the open valve pistons 19 , 25 into the outlet chamber, where they can exit from the valve device via the outlet duct and the flange.
  • closing of the valve device can also be initiated pneumatically.
  • the two tappets 39 push the pressure plate 37 backwards when the sealing plate 56 is attached, the force-receiving element 10 remains in the starting position thereof under the effect of the compression spring 54 .
  • compressed air can be applied to the pressure space 59 in the block bushing 46 via the air duct 58 ( FIG. 2 ) so that the force-receiving element 10 together with the two valve pistons 19 , 25 is moved backwards into the retracted effective or closed position, counter to the force of the compression spring 54 .
  • Pneumatic closing of the valve device can be necessary, for example, at the start of a casting cycle, since the die-casting machine does not inject the casting material into the mould at high pressure.
  • compressed can be used, for example, to check the operation of the venting valves for correct closing.
  • FIG. 8 shows the valve device in a diagram according to FIG. 7 ; the casting material G advancing via the venting duct 3 into the valve device as far as the head part of the force-receiving element 10 is shown schematically.
  • the kinetic energy of the casting material G advancing at high speed means that the force-receiving element 10 is pushed suddenly backwards into the effective position shown by the casting material G meeting the end face of the head part of the force-receiving element.
  • the force-receiving element 10 drives the two valve pistons 19 , 25 with its backward movement. Because the force-receiving element 10 is arranged in the centre between the two valve pistons 19 , 25 and together with them in a horizontal plane, symmetrical loading of the force-receiving element 10 can be achieved, which is advantageous with respect to reliable operation. At the same time, this embodiment helps to keep the mass and weight of the force-receiving element 10 comparatively low, since only two radial protrusions 14 , 15 have to be provided, rather than a driver plate or the like as in the devices according to the prior art. In addition, the said arrangement together with the symmetrical structure of the valve device 1 means that the distance which the liquid casting material travels from the force-receiving element 12 to each valve piston 19 , 25 is equal.
  • the closing elements consisting of the force-receiving element 10 and the two valve pistons 19 , 25 are dimensioned and coordinated with each other such that the two valve pistons 19 , 25 are in the pushed-back closed position before the casting material G has advanced as far as the respective venting valve, specifically the head part 22 , 28 of the respective valve piston 19 , 25 .
  • This circumstance is indicated by the fact that there is still no casting material present and shown in the respective branch 7 , 8 , specifically in the space upstream of the valve piston 19 , 25 .
  • the force-receiving element 10 covers an axial distance of between 1 and 7 mm, preferably between 3 and 5 mm.
  • the shape and design of the venting duct 3 with the two branches 7 , 8 thereof is coordinated with the force-receiving element 10 and the two valve pistons 19 , 25 such that the two valve pistons 19 , 25 are pushed backwards into the closed position before the casting material has advanced as far as the valve pistons 19 , 25 .
  • Tests and simulations relating to this with a valve device according to the invention have shown that an average closing process takes approximately 1 millisecond, measured from the point in time at which the casting material meets the force-receiving element 10 to the point in time at which the two valve pistons 19 , 25 close. In contrast, the casting material takes approximately 4 milliseconds to advance from the force-receiving element 10 to the two valve pistons 19 , 25 .
  • the elements consisting of force-receiving element 10 , valve pistons 19 , 25 and venting duct 3 or the branches 7 , 8 are dimensioned and coordinated with one another such that the two valve pistons 19 , 25 are in the pushed-back closed position before the casting material has advanced as far as them. Thanks to the comparatively low mass to be moved (force-receiving element, valve pistons), the closing process is no longer as time-critical as in comparable valve devices. In comparable valve devices, a mass approximately 2 to 4 times greater must be moved for a closing process.
  • the sealing plate 56 is removed from the front face 40 .
  • the tappets 39 ( FIG. 5 ) are released, as a result of which the spring assembly consisting of the four compression springs 38 can relax.
  • the spring assembly then presses the movable pressure plate 37 ( FIG. 3 ), together with the force-receiving element 10 , the two valve pistons 19 , 25 and the four pressure rods, forwards in the direction of the front face 40 .
  • the force-receiving element 10 together with the two valve pistons 19 , 25 presses on the casting compound which has solidified in the venting duct 3 and the branches 7 , 8 thereof and ejects it forwards out of the valve housing 2 .
  • the spring assembly is thus used to return the force-receiving element 10 together with the two valve pistons 19 , 25 into the starting or open position and to eject the solidified casting compound.
  • such a valve device allows high venting outputs thanks to the provision of two venting valves.
  • force-transmitting elements between the force-receiving element and the respective valve piston can be omitted, thanks to the direct coupling of the force-receiving element, which is actuated by casting material, to the valve piston of the respective venting valve.
  • the weight of the parts needed for closing the valve pistons can be considerably reduced, which allows faster closing of the venting valves and/or a lower amount of energy required for the closing process.
  • the valve device has a very simple structure and favours an operation which is reliable and stable in the long term.
  • the substantially symmetrical structure also means the risk of the movable parts jamming or wearing away on one side is also reduced. Compared with known and comparable valve devices, the total number of components, the size and the total weight can also be reduced.
  • venting valves can be provided instead of two venting valves.
  • the force-receiving element in such an embodiment is preferably also arranged centrally between the venting valves, with the venting valves preferably being distributed on a circular face.
  • the force-receiving element could also be provided with one projection which runs around in an annular or collar-like manner and is coupled to the valve pistons.
  • a further advantage consists in a filter being integrated into the valve device. For example, a filter could be integrated into the outlet chamber.
  • force-receiving elements which are actuated by casting material are mentioned above, this does not necessarily mean a force-receiving element actuated by casting material directly; embodiments in which the force-receiving element is actuated by the casting material indirectly are also conceivable.
  • an element could be arranged upstream of the force-receiving element, said element coming into direct contact with the casting material and transmitting the force needed to close the valve pistons from the casting material to the force-receiving element.
  • Such an embodiment could be practical if, for example, the element coming into contact with the casting material is intended to cover only a fraction of the closing distance of the force-receiving element, to reduce the transmitted kinetic energy.
  • Valve device 1. Valve device 2. Valve housing 3. Venting duct 4. Inlet 5. Inlet duct 6. Branching 7. Left branch 8. Right branch 9. Opening 10. Force-receiving element 11. Main body (force-receiving element) 12. Head part (force-receiving element 13. Cut-out (force-receiving element 14. Radial protrusion 15. Radial protrusion 16. Annular pressure face 17. Opening 18. First venting valve 19. Valve piston 20. First vertical duct 21. Slot-shaped cut-out (valve piston) 22. Head part (valve piston) 23. Opening 24. Second venting valve 25. Valve piston 26. Second vertical duct 27. Slot-shaped cut-out (valve piston) 28. Head part (valve piston) 29. 30. Outlet chamber 31. 32. Outlet 33.
  • Compression spring (force-receiving element) 55 Screw-fastening 56. Sealing plate, compensator 57. 58. Air channel 59. Pressure space 60. 61. force-receiving element-starting position-effective position Valve piston-open position-closed position 64. 65. 66. 67. 68. 69. 70.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Measuring Fluid Pressure (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Valve Housings (AREA)
  • Fluid-Driven Valves (AREA)
US15/907,659 2017-03-16 2018-02-28 Valve device for venting die-casting moulds Abandoned US20180264543A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00321/17 2017-03-16
CH00321/17A CH713574A1 (de) 2017-03-16 2017-03-16 Ventileinrichtung zum Entlüften von Druckgiessformen.

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US20180264543A1 true US20180264543A1 (en) 2018-09-20

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US15/907,659 Abandoned US20180264543A1 (en) 2017-03-16 2018-02-28 Valve device for venting die-casting moulds

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US (1) US20180264543A1 (de)
EP (1) EP3375547A1 (de)
JP (1) JP2018153864A (de)
KR (1) KR20180106901A (de)
CN (1) CN108620552A (de)
AR (1) AR111527A1 (de)
AU (1) AU2018201026A1 (de)
BR (1) BR102018004366A2 (de)
CA (1) CA2994892A1 (de)
CH (1) CH713574A1 (de)
IL (1) IL257474A (de)
MX (1) MX2018003387A (de)
RU (1) RU2018109080A (de)
SG (1) SG10201801257WA (de)
TW (1) TW201836736A (de)
ZA (1) ZA201801384B (de)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN114713790A (zh) * 2022-04-29 2022-07-08 江苏富松模具科技有限公司 一种压铸模具的型腔排气系统

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CN110625086A (zh) * 2019-09-26 2019-12-31 浙江华朔科技股份有限公司 一种装有前部阻挡镶件的压铸模具模芯结构
CN112916822A (zh) * 2021-03-16 2021-06-08 重庆美利信科技股份有限公司 一种用于压铸机基坑回炉料的自动收集筛分装置

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DE2751431C2 (de) * 1977-11-17 1986-03-06 Fritz Territet Vaud Hodler Entlüftungsventil für Druckgießformen
EP0281877B1 (de) * 1987-03-13 1992-06-03 Ube Industries, Ltd. Entgasungseinrichtung für eine Metallform
US4987946A (en) * 1989-09-05 1991-01-29 General Motors Corporation Valve for mold cavity gas removal system
DE4302798C1 (de) * 1993-02-02 1994-06-16 Hodler F & Cie Fondarex Sa Ventileinrichtung zum Entlüften von Druckgiessformen
JP3422132B2 (ja) * 1995-05-22 2003-06-30 トヨタ自動車株式会社 ダイカスト用通気弁
JP3226837B2 (ja) * 1997-07-04 2001-11-05 トヨタ自動車株式会社 鋳造用金型のガス抜き装置
EP0937524A1 (de) * 1998-02-19 1999-08-25 Fondarex S.A. Verfahren zum Entlüften von Druckgiessformen sowie Ventilvorrichtung zur Durchführung des Verfahrens
TW579311B (en) * 2000-09-22 2004-03-11 V D S Vacuum Diecasting Servic Diecasting valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114713790A (zh) * 2022-04-29 2022-07-08 江苏富松模具科技有限公司 一种压铸模具的型腔排气系统

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BR102018004366A2 (pt) 2018-10-30
EP3375547A1 (de) 2018-09-19
AU2018201026A1 (en) 2018-10-04
KR20180106901A (ko) 2018-10-01
SG10201801257WA (en) 2018-10-30
CN108620552A (zh) 2018-10-09
AR111527A1 (es) 2019-07-24
ZA201801384B (en) 2018-12-19
CA2994892A1 (en) 2018-09-16
JP2018153864A (ja) 2018-10-04
MX2018003387A (es) 2019-05-15
RU2018109080A (ru) 2019-09-16
IL257474A (en) 2018-04-30
TW201836736A (zh) 2018-10-16
CH713574A1 (de) 2018-09-28

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