WO2019117731A1 - Corps de soupape pour système de moulage par injection à corps de soupape unique - Google Patents

Corps de soupape pour système de moulage par injection à corps de soupape unique Download PDF

Info

Publication number
WO2019117731A1
WO2019117731A1 PCT/NZ2018/050175 NZ2018050175W WO2019117731A1 WO 2019117731 A1 WO2019117731 A1 WO 2019117731A1 NZ 2018050175 W NZ2018050175 W NZ 2018050175W WO 2019117731 A1 WO2019117731 A1 WO 2019117731A1
Authority
WO
WIPO (PCT)
Prior art keywords
spacer
valve gate
valve
head portion
connector assembly
Prior art date
Application number
PCT/NZ2018/050175
Other languages
English (en)
Inventor
Brett REYNOLDS
Mario DELLA VALLE
Original Assignee
Mastip Technology Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mastip Technology Limited filed Critical Mastip Technology Limited
Publication of WO2019117731A1 publication Critical patent/WO2019117731A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/20—Injection nozzles
    • B29C45/23—Feed stopping equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/20—Injection nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/20—Injection nozzles
    • B29C2045/202—Laterally adjustable nozzle or nozzle tip mountings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/20—Injection nozzles
    • B29C45/23—Feed stopping equipment
    • B29C2045/235—Feed stopping equipment axially movable inclined or orthogonal valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C2045/2848—Closure devices therefor consisting of needle valve systems having an adjustable stroke length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C2045/2889—Sealing guide bushings therefor

Definitions

  • the present invention relates to apparatus and methods for injection moulding, and in particular to a valve gate for an injection moulding system and to a method of adjusting the position of a valve member sealing portion relative to the valve gate actuation means.
  • the invention has particular application to single valve gate systems (as opposed to
  • Plastic injection moulding involves injecting a plasticized moulding material into a mould cavity through a manifold and a nozzle.
  • Flow out of the nozzle is controlled at a gate.
  • the gate has a valve pin which extends into or through the nozzle assembly. The pin is moved relative to the nozzle to either allow or prevent flow through the nozzle.
  • valve pin is mounted to an actuator which moves the pin between an open and a shut position.
  • Positioning of the valve pin relative to a seat portion is critical, to ensure the valve pin shuts off the gate within a very tight tolerance, thereby ensuring a quality part.
  • manual modification of the valve pin to ensure positive gate shut off is an onerous task for a toolmaker.
  • a valve gate for a single valve gate injection moulding system, the valve gate comprising a body, an inlet for a mouldable material, an outlet for the mouldable material, and a conduit connecting the inlet and outlet, the body comprising a mounting means for mounting a nozzle, in use, to the body, the mounting means located such that an inlet of the nozzle is in fluid communication with the outlet of the valve gate when mounted to the mounting means,
  • valve gate further comprising an actuator means moveable relative to the body between a first position and a second position and an elongate valve member comprising a head portion at or adjacent a first end of the valve member and a sealing portion at an opposite end of the valve member to the head portion,
  • the head portion of the valve member is connected to the actuator means by an adjustable connector assembly which comprises one or more spacer means provided between the head portion and the actuator means, and wherein the adjustable connector assembly is adapted to allow adjustment of the position of the sealing portion of the valve member relative to the actuator means.
  • the adjustable connector assembly comprises a plurality of spacer members.
  • the adjustable connector assembly comprises at least one spacer member on a first side of the head portion and at least one spacer member on a second side of the head portion, opposite the first side, wherein the first side of the head portion is closer to the mounting means than the second side.
  • at least one spacer member of the plurality of spacer members is a different thickness to at least one other spacer member of the plurality of spacer members.
  • each spacer member is a different thickness to each other spacer member.
  • the thicknesses of the spacer members differ by 0.1mm.
  • each spacer is between 2.0mm and 3.0mm thick.
  • each spacer member comprises an annular disc.
  • the actuator means comprises an aperture adapted to receive the spacer means.
  • the aperture defines an abutment surface adapted to abut one of the spacer means in use.
  • the adjustable connector assembly further comprises a locking means to prevent the valve member and spacer means from moving relative to the actuator means.
  • a second aspect of the present invention there is provided a method of adjusting the position of the sealing portion of the valve gate of the first aspect relative to the actuation means, the method comprising the steps of:
  • the method further comprising the step of re-engaging the valve member and adjustable connector assembly with the actuation means.
  • the adjustable connector assembly comprises the same number of spacer means after the position of the head portion is adjusted as it did before the position was adjusted.
  • At least one spacer means is provided on the second side of the head portion before the position of the head portion is adjusted, and the method comprises arranging the spacer means such that at least one spacer means is provided on the second side of the head portion after the position is adjusted.
  • Figure 1 is a perspective view from one side and below of a valve gate according to one embodiment of the present invention with an injection nozzle mounted to the mounting means;
  • Figure 2 is a cross-section side view of the valve gate and nozzle of Figure 1, with the
  • Figure 3 is a cross-section front view of the valve gate and nozzle of Figure 1, with the actuator and valve in the first position;
  • Figure 4 is a cross-section front view of the valve gate and nozzle of Figure 1, with the actuator and valve in the second position;
  • Figure 5 is an enlarged cross-section side view of the adjustable connector assembly of the valve gate and nozzle of Figure 1, with the actuator and valve in the first position;
  • Figure 6 is another enlarged cross-section side view of the adjustable connector assembly of the valve gate and nozzle of Figure 1, with the spacer means in a different configuration.
  • Figure 7 is a side view of one embodiment of a spacer means of the present invention.
  • Figure 8 is a cross-section side view of the spacer means of Figure 7.
  • Figure 9 is a top view of the spacer means of Figure 7.
  • a valve gate for a single valve gate injection moulding system is generally referenced by arrow 100.
  • valve gate 100 is shown connected to a nozzle 6, as is described further below.
  • the valve gate 100 comprises a body 1 and a conduit 2 which defines a flow path from an inlet
  • the body 1 is provided with a mounting means 5 for mounting a nozzle 6.
  • the mounting means 5 for mounting a nozzle 6.
  • the nozzle 6 may be any suitable nozzle 6 of the prior art.
  • the nozzle 6 include a heater sleeve 43 provided over the nozzle 6, the heater sleeve comprises a heater coil 44 (best seen in Figure 1) having a specific coil arrangement or pattern that is adapted to the length of the nozzle 6.
  • the heater coil arrangement is configured to supply an even thermal profile to the nozzle, such that heater coil pattern will be different for nozzles 6 having different lengths or thicknesses.
  • the heater sleeve 43 may include a thermocouple clip 45 to assist in retaining the
  • thermocouple to the nozzle 6.
  • the mounting means 5 comprises a socket 7 with an internal thread 8 to which an externally threaded mounting portion of the nozzle 6 can be connected.
  • the valve gate 100 further comprises an elongate valve member 10, also known as a valve pin, which is connected to an actuator means 11 by an adjustable connector assembly 12 which is described further below.
  • the valve member 10 extends through a valve seal 13.
  • the actuator means 11 is movable between a first position (shown in Figures 2 and 3), in which, in use, a sealing portion 14 of the valve member 10 extends through the nozzle 6 and abuts a seat portion of the mould cavity (not shown) to thereby prevent flow through the nozzle 6 into the cavity, and a second position (shown in Figure 4), in which the sealing portion 14 of the valve is moved away from the seat portion so that the moulding material can flow through the nozzle 6 into the cavity.
  • the sealing portion 14 moves inside the nozzle 6 when in the second position.
  • any suitable actuator means 11 may be used, for example hydraulic, pneumatic or electric.
  • the actuator means 11 comprises an annular piston 15 which is pneumatically actuated.
  • the piston 15 operates inside an annular bore 16.
  • the actuator means 11 further comprises a link portion 17 connected to the piston 15.
  • the link portion 17 is rigidly connected to the piston 15 and is preferably integrally formed with the piston 15.
  • the link portion 17 of the actuator means 11 comprises an aperture 20 therethrough.
  • An intermediate part 21 of the aperture 20 has a first diameter which is preferably substantially equal to (but larger than) a diameter of the head portion 22 of the valve member 10.
  • a second portion 24 of the aperture 20 closest to the nozzle mounting means 5 has a second, smaller, diameter which is preferably substantially equal to (but larger than) the diameter of the shaft 23 of the valve member 10, the step between the first and second diameters thereby defining an abutment surface 25 for the spacer means 30 and the head 22 of the valve member 10.
  • a third portion 26 of the aperture on the opposite side of the link portion 17 to the nozzle mounting means 5 has a larger diameter than the intermediate portion 21, but in other embodiments the diameter may be substantially the same as that of the intermediate portion 21.
  • An adjustable connector assembly 12 is provided which comprises at least one spacer means 30 provided between the head 22 of the elongate valve member 10 and the abutment surface 25.
  • the adjustable connector assembly 12 is provided within a valve assembly pocket 42 having a predetermined depth to accommodate the at least one spacer means 30 and the valve head 22.
  • the total combined depth of the at least one spacer means 30 and the valve head 22 being substantially equal to the predetermined depth of the valve assembly pocket 42.
  • the thickness of the spacer means 30 determines the distance between the actuator means 11 and the sealing portion 14 of the elongate valve member 10, and so affects the position of the sealing portion 14 relative to the seat portion of the cavity (not shown) when the actuator means 11 is in its first position.
  • the adjustable connector assembly 12 further comprises a locking means, for example a screw 31, which prevents the valve member 10 and spacers 30 from moving relative to the actuator means 11.
  • the locking means is a screw 31 which engages the third portion 26 of the aperture 20 on the opposite side of the link portion 17 to the nozzle mounting means.
  • a spacer means 30a (shown in Figure 5) is preferably also provided between the head 22 of the elongate valve member 10 and the locking screw 31.
  • each spacer means 30 of the adjustable connector assembly 12 has a different thickness (although embodiments in which two or more, or all, of the spacer means 30 have the same thickness are possible).
  • the thicknesses of the spacer means 30 preferably differ by approximately 0.1mm.
  • the spacer means 30 may be 2.0mm, 2.1mm, 2.2mm and 2.3mm thick.
  • spacers for 2.0mm, 2.5mm and 3.0mm diameter valve pins may be substantially 2.25mm, 2.35mm, 2.45mm and 2.55mm thick.
  • each spacer is between 2.0mm and 3.0mm thick. These dimensions are exemplary only, and other dimensions may be used.
  • each spacer means 30 comprises a substantially annular disc 50 having an internal aperture 32 with a diameter approximately equal to (but greater than) the diameter of the shaft 23 of the valve member 10, so that the spacer means 30 can slide onto the shaft 23 of the valve member 10.
  • the adjustable connector assembly 12 can be reconfigured such that an additional spacer means 30 is placed on top of the valve pin head 22 resulting in two adjustment spacers on top of the head and two between the head and the abutment surface 25, in order to make a relatively large adjustment to the position of the sealing portion 14 of the elongate valve member 10 relative to the actuator means 11. Thereafter incremental adjustment in two steps of 0.1mm is still achievable for positive gate shut off.
  • access must be gained to the adjustable connector assembly 12. In the embodiment shown this is done by removing the locating ring 33 and striker plate 34.
  • the body 1 is provided in two parts la, lb, with the valve seal 13 provided at the intersection of the two parts la, lb.
  • the locking screw 31 can be removed and the valve pin 10 and spacer means 30 removed.
  • the configuration of the spacer means 30 between the valve head 22 and the abutment surface 25 can then be changed, either by changing the number of spacer means 30 on the first side of the head portion 22 or removing a spacer means 30 on the first side of the head portion 22 and replacing the removed spacer means 30 with another spacer means 30 having a different thickness.
  • valve gate shown in the Figures is designed in such a way that makes assembly very easy and allows the unit to be supplied in a fully assembled condition ready for production.
  • Assembly begins with screwing the threaded nozzle 6 into the mounting means 5.
  • a brass integrated heater sleeve 40 is then fitted over the lower portion of the body lb.
  • the bore 16 is provided within a separate cylinder part 41 which is connected to the body 1.
  • the piston 15 with assembled valve pin 10 and spacer means 30 is then pushed into the cylinder 41.
  • the upper body part la is then slid into the heater sleeve 40 and pushed down towards the lower body part lb.
  • the striker plate 34 is placed on the upper body part la.
  • the striker plate 34 and upper and lower body parts la, lb are fastened together with a plurality of cap screws, such as four cap screws.
  • the locating ring 33 is then connected to the cylinder 41.
  • the nozzle body can then be completed by fitting the tip, nut and heater.
  • the spacer means preferably comprises a substantially annular disc 50 with an aperture 32 therethrough.
  • the aperture 32 is preferably chamfered at both ends 51 to assist with installation on the valve member 10.
  • the outer wall 52 of the spacer means 30 is provided with at least one groove 53.
  • the number of grooves provided may indicate the thickness, or the relative thickness, of the spacer means 30.
  • a spacer means 30 having only one groove 53 may be the thinnest spacer means in a set, while a spacer means 30 having four grooves 53 (as shown in Figure 7) may be the thickest. In this way the spacer means 30 may be identified without the use of measuring tools.
  • valve gate for an injection moulding system which allows easy and convenient adjustment of the position of the sealing portion of the valve gate relative to the actuation means, which thereby adjusts the position of the sealing portion relative to the position of the seat portion which the sealing portions seals against in use.
  • the invention may also be said broadly to consist in the parts, elements and features referred to or indicated in the specification of the application, individually or collectively, in any or all combinations of two or more of said parts, elements or features.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Un corps de soupape (100) pour un système de moulage par injection à corps de soupape unique comprend un corps (1), une entrée (3), une sortie (4), et un conduit (2) reliant l'entrée et la sortie. Le corps (1) comprend un moyen de montage (5) pour monter une buse (6), lors de l'utilisation, sur le corps (1). Un moyen d'actionnement (11) est mobile par rapport au corps (1) entre une première position et une deuxième position. L'invention concerne également un élément de soupape allongé (10) comprenant une partie de tête (22) au niveau ou à proximité d'une première extrémité de l'élément de soupape et une partie d'étanchéité (14) au niveau d'une extrémité opposée de l'élément de soupape (10) à la partie de tête (22). La partie de tête (22) de l'élément de soupape est reliée au moyen d'actionnement (11) par un ensemble connecteur réglable (12) qui comprend un ou plusieurs moyens d'espacement (30) entre la partie de tête (22) et le moyen d'actionnement (11). L'ensemble connecteur réglable (12) permet le réglage de la position de la partie d'étanchéité (14) sans modifier l'élément de soupape (10).
PCT/NZ2018/050175 2017-12-14 2018-12-10 Corps de soupape pour système de moulage par injection à corps de soupape unique WO2019117731A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ738377 2017-12-14
NZ73837717 2017-12-14

Publications (1)

Publication Number Publication Date
WO2019117731A1 true WO2019117731A1 (fr) 2019-06-20

Family

ID=66820567

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2018/050175 WO2019117731A1 (fr) 2017-12-14 2018-12-10 Corps de soupape pour système de moulage par injection à corps de soupape unique

Country Status (1)

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WO (1) WO2019117731A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110802802A (zh) * 2019-10-24 2020-02-18 王倩 一种新型分离式可过滤注塑喷嘴

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5478230A (en) * 1994-04-13 1995-12-26 Caco Pacific Corporation Back-to-back valve gate system
US6840758B2 (en) * 2001-10-26 2005-01-11 Mold-Masters Limited Valve bushing assembly
US20090280209A1 (en) * 2006-10-04 2009-11-12 Herbert Gunther Injection moulding device comprising needle valve nozzles in a back-to-back arrangement
US7931455B2 (en) * 2008-10-10 2011-04-26 Mold-Masters (2007) Limited Injection molding apparatus having magnetic valve pin coupling

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5478230A (en) * 1994-04-13 1995-12-26 Caco Pacific Corporation Back-to-back valve gate system
US6840758B2 (en) * 2001-10-26 2005-01-11 Mold-Masters Limited Valve bushing assembly
US20090280209A1 (en) * 2006-10-04 2009-11-12 Herbert Gunther Injection moulding device comprising needle valve nozzles in a back-to-back arrangement
US7931455B2 (en) * 2008-10-10 2011-04-26 Mold-Masters (2007) Limited Injection molding apparatus having magnetic valve pin coupling

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110802802A (zh) * 2019-10-24 2020-02-18 王倩 一种新型分离式可过滤注塑喷嘴

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