WO2015013392A1 - Goupille de soupape en deux parties - Google Patents

Goupille de soupape en deux parties Download PDF

Info

Publication number
WO2015013392A1
WO2015013392A1 PCT/US2014/047789 US2014047789W WO2015013392A1 WO 2015013392 A1 WO2015013392 A1 WO 2015013392A1 US 2014047789 W US2014047789 W US 2014047789W WO 2015013392 A1 WO2015013392 A1 WO 2015013392A1
Authority
WO
WIPO (PCT)
Prior art keywords
end piece
gate
comprised
distal end
stem
Prior art date
Application number
PCT/US2014/047789
Other languages
English (en)
Inventor
Zhuang Rui TAN
Vito Galati
Original Assignee
Synventive Molding Solutions, Inc.
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 Synventive Molding Solutions, Inc. filed Critical Synventive Molding Solutions, Inc.
Publication of WO2015013392A1 publication Critical patent/WO2015013392A1/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
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • 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
    • B29C2045/2858—Materials or coatings therefor

Definitions

  • valve pins comprised of a stem and one or more additional components attached to the stem for sensing purposes have been developed.
  • An injection molding apparatus that is comprised of an actuator mounted to either a top clamp plate or a fluid distribution manifold having one or more fluid distribution channels, an injection molding machine that injects an injection fluid material into the one or more fluid distribution channels, the one or more fluid distribution channels communicating with a nozzle having a fluid delivery channel and a distal downstream gate having a predetermined configuration, a mold having a cavity that communicates with the downstream gate to enable the injection fluid material to flow under pressure into the cavity,
  • apparatus further comprises:
  • valve pin assembly comprised of a stem removably interconnected to the actuator and a distal end piece removably attachable to a downstream distal tip end of the stem
  • the stem and attached end piece being controllably drivable along an axial path of travel through the fluid delivery channel of the nozzle via controllable axial upstream-downstream drive of the actuator,
  • the distal end piece being formed into a configuration that is complementary to the predetermined configuration of the gate such that the distal end piece is receivable within the gate to mate with interior surfaces of the gate to close off the gate to stop fluid flow through the gate on controlled downstream driving of the valve pin and distal end piece,
  • the distal end piece is preferably comprised of a material selected from the group consisting of Carbide, Cemented Carbide, Tantalum Alloys, Zirconium Alloys, Titanium Alloys, Molybdenum Alloys, High Vanadium containing Steel and Stainless Steel.
  • the alloys are preferably alloys of iron or steel.
  • the material of which the stem is comprised preferably has a corrosion rate of between about 0 and about 4 mpy.
  • the material of which the distal end piece is comprised preferably has a corrosion rate of between about 0 and about 2 mpy.
  • the stem is typically comprised of a material selected from the group consisting of M390 (DIN4.2001 ), H 13 (DIN1 .2344), D2 (DIN1 .2379) and M2
  • the material of which the distal end piece is comprised most preferably has a substantially greater degree of resistance to corrosion or wear or abrasion than the degree of resistance to corrosion or wear or abrasion of the material of which the stem is comprised.
  • a method of injecting an injection fluid material to a cavity of a mold comprising delivering the injection fluid material from an injection machine to one or more fluid distribution channels of a fluid distribution manifold that is mounted within an injection molding apparatus that is comprised of an actuator that is mounted to either a top clamp plate or to the fluid distribution manifold, wherein one or more of the fluid distribution channels communicate with a nozzle having a fluid delivery channel and a distal downstream gate having a predetermined configuration, wherein the molten fluid flows through the gate under pressure into the cavity,
  • apparatus further comprises:
  • valve pin assembly comprised of a stem removably interconnected to the actuator and a distal end piece that is removably attachable to a downstream distal tip end of the stem
  • the stem and attached end piece being controllably drivable along an axial path of travel through the fluid delivery channel of the nozzle via controllable axial upstream-downstream drive of the actuator,
  • the distal end piece being formed into a configuration that is complementary to the predetermined configuration of the gate such that the distal end piece is receivable within the gate to mate with interior surfaces of the gate to close off the gate to stop fluid flow through the gate on controlled downstream driving of the valve pin and distal end piece,
  • the distal end piece being comprised of a material that is different from the material of which the stem is comprised, the material of which the distal end piece is comprised being selected to be corrosion resistant or abrasion or wear resistant or both.
  • the distal end piece is preferably comprised of a material selected from the group consisting of Carbide, Cemented Carbide, Tantalum Alloys, Zirconium Alloys, Titanium Alloys, Molybdenum Alloys, High Vanadium containing Steel and Stainless Steel.
  • the material of which the stem is comprised preferably has a corrosion rate of between about 0 and about 4 mpy.
  • the material of which the distal end piece is comprised preferably has a corrosion rate of between about 0 and about 2 mpy.
  • the stem is typically comprised of a material selected from the group consisting of M390 (DIN4.2001 ), H1 3 (DIN 1 .2344), D2 (DIN1 .2379) and M2 (DIN1 .3343, SKH-51 ).
  • the material of which the distal end piece is comprised preferably has a substantially greater degree of resistance to corrosion or wear or abrasion than the degree of resistance to corrosion or wear or abrasion of the material of which the stem is comprised.
  • an injection molding apparatus that is comprised of an actuator mounted to either a top clamp plate or a fluid distribution manifold having one or more fluid distribution channels, an injection molding machine that injects molten fluid into the one or more fluid distribution channels, the one or more fluid distribution channels of the manifold communicating with a fluid delivery channel of a nozzle having a distal downstream gate having a predetermined configuration and a mold having a cavity that communicates with the downstream gate to enable the molten fluid to flow under pressure into the cavity, a method of injecting the injection fluid material to the mold cavity,
  • valve pin assembly in the form of a distal end piece that is removably attachable to a downstream distal tip end of a stem, removably interconnecting an upstream end of the stem to the actuator, adapting the stem and attached end piece to be controllably drivable along an axial path of travel through the fluid delivery channel of the nozzle via controllable axial upstream-downstream drive of the actuator,
  • distal end piece into a configuration that is complementary to the predetermined configuration of the gate such that the distal end piece is receivable within the gate to mate with interior surfaces of the gate to close off the gate to stop fluid flow through the gate on controlled downstream driving of the valve pin and distal end piece, and,
  • distal end piece and the stem from different materials, and forming the material of which the stem from a material that is corrosion resistant or abrasion or wear resistant or both.
  • Fig. 1 is a cross-section of an embodiment of the invention showing a two piece valve pin assembled in an injection molding system stack showing the valve pin mounted within the system and the relative arrangement of components of the system.
  • FIG. 2 is an enlarged detail view of the area encircled by arrows 2-2 in
  • Fig. 1 showing in greater detail the relative size, configuration and arrangement of the two pieces of which the valve pin is comprised.
  • FIG. 3A is a partial cross-sectional view of the downstream nozzle portion of an apparatus as shown in Fig. 1 showing another embodiment of a two- piece, two-material valve pin in a gate closed position.
  • Fig. 3B is a view similar to Fig. 3A showing the valve pin having been withdrawn upstream a distance RP from the gate closed position.
  • Figs. 1 , 2 shows one embodiment of the invention where a valve in the system 1 0 has a two piece valve pin 20, the upstream head 25 of which is mounted within a mounting, receiving slot of the piston 30 of an actuator 40 which is mounted to a fluid distribution manifold or hotrunner 50.
  • the valve pin 20 is comprised of an elongated stem 22 that is slidably mounted in a complementary aperture in a bushing 52 that is attached to the manifold 50 in an arrangement that disposes the stem 22 to extend through a fluid distribution channel 54 of the manifold and further downstream through the fluid distribution channel 62 of a nozzle 60.
  • the piston 30 is controllably driven in an upstream-downstream axial X manner which in turn controllably drives the valve stem 22 in and along the same upstream- downstream direction and motion X.
  • the distal tip end 27 of the valve pin 22 is in turn driven axially X back and forth between a closed gate position as shown in Fig. 2 and an upstream gate open position. In the gate closed position of Fig. 2, the tip end 27 closes off the gate aperture 70 that communicates with the mold cavity 80 contained within the mold 90 plates.
  • the gate aperture 70 is no longer blocked from communication with cavity 80 and injection fluid material 64 that is injected under pressure from channel 54 into nozzle channel 62 can then flow past the outer surface of tip end 27 and the inner surface 70s of gate 70 through gate aperture 70 into cavity 80.
  • the shape and exterior contour of the tip end 27 and valve pin and the contour of the interior gate surface 70s, 1254 are configured or adapted to cooperate with each other to restrict and vary the rate of flow 64r of fluid material 64, Figs. 3A, 3B over the course of travel of the tip end of the valve pin through a restricted or reduced velocity path of upstream travel RP.
  • the outside surfaces 1 1 55 of the tip end 27f of the pin 22 create restricted flow channels such as channel 1 1 54 that reduce the volume or rate of flow of fluid material relative to the rate of flow when the pin is at a full gate open position COP3 when it is at or beyond, for example a 4 mm upstream position COP.
  • the rate of fluid flow into the cavity continues to increase from 0 to a maximum when the tip end 27 of the pin 22 reaches the gate fully open position of, for example the 4mm position, COP.
  • the tip end 27 of the pin is cylindrical.
  • the outside surface 22t of the distal end portion of the pin 22 that the tip end 27 is attached to or inserted into is tapered.
  • the interior surface 60s of the distal portion of the nozzle channel 62 leading to the gate 70 of the cavity 80 can be tapered to accommodate mating with the tapered distal end of the pin 22 shown in the Figs. 1 , 2 configuration-embodiment pin when the pin 22 is moved to its furthest downstream gate closed position as shown in Figs. 1 , 2.
  • the exterior circumferential surface 1 155 of the tip end 27 of the pin 22 can be cylindrical as shown in Figs. 1 , 2, 3A, 3B but can also have another selected geometry or configuration and accomplish the same restricted flow channels 1 154 for purposes of reducing the fluid material flow as described above.
  • the pin 22 can be driven in a controlled manner such that the tip end 27 of the pin is withdrawn upstream beginning from the gate closed position, Fig. 2, 3A at a reduced velocity relative to a maximum velocity over either a preselected period of time as described in detail in PCT Published Application WO2012/087491 A1 or over a preselected length of pin travel RP, RP3, UR as described in detail in PCT Published Application WO2012/087491 A1 , the disclosures of both of which are incorporated herein by reference in their entirety as if fully set forth.
  • the tip 27 may not necessarily be in a position where the fluid flow 64r is not still being restricted.
  • the fluid flow 64r can still be restricted to less than maximum flow when the pin has reached the changeover position where the pin 22 is driven at a higher, typically maximum, upstream velocity FOV.
  • the tip end 27 of the pin 22 no longer restricts the rate of flow of fluid material 64 through the gap 1 154 because the gap 1 154 has increased to a size that no longer restricts fluid flow 64 to less than the maximum flow rate of material flow.
  • the maximum fluid flow rate for injection material is reached at the upstream position COP of the tip end 27.
  • the pin 22 can be instructed to be driven at reduced or less than maximum velocity over a longer path length RP3 having an upstream portion U R where the flow of injection fluid mold material is not restricted but flows at a maximum rate through the gate 70 for the given injection mold system.
  • the velocity or drive rate of the pin 22 is not changed over until the tip end of the pin 22 or actuator has reached the changeover position COP3.
  • a position sensor can be used to sense either that the valve pin 22 or an associated component has travelled a predetermined path length RP3 or reached an end COP3 of the selected path length and a controller can receive and process such information and then instruct the drive system to drive the pin 22 at a higher, typically maximum, velocity upstream to a maximum upstream position at the higher velocity.
  • the pin 22 can be driven at reduced or less than maximum velocity throughout the entirety of the travel path of the pin during an injection cycle from the gate closed position up to the end-of-stroke EOS position, the controller 16 being programmed to instruct the drive system for the actuator 40 to be driven at one or more reduced velocities for the time or path length of an entire gate closed to fully open EOS cycle.
  • the valve pin 20 comprises at least two pieces, namely the valve stem 22 and a downstream distal tip end piece 27 comprised of an upstream projection portion 27a and a downstream gate insert section 27b which together are preferably a unitary body or structure 27.
  • the pin 22 and end piece 27 are removably and fixedly interconnectable to each other via such means as force fit insertion of the projection portion 27a of the end piece 27 into a complementary axially arranged downstream distally disposed aperture 22a that is drilled into and within the downstream distal tip end of the stem 22.
  • end piece 27 and stem 22 can be adapted to be attached to each other via
  • the two pieces 22, 27 can be attached to each other via welding, brazing, collaring or other attachment methods that are
  • the tip 27 is comprised of a material that has a thermal conductivity that is equal to or greater than the material of which stem 22 is comprised.
  • the tip 27 is comprised of a material that is corrosion resistant or wear or abrasion resistant or both to prevent or retard corrosion or wear or abrasion at the distal end or face surface 27f of the distal tip end piece 27.
  • the hardness of the valve pin body or stem 22 is between about 45 and about 65HRC (which is limited by galling in the valve pin bushing 52 on the low end and machinability of a long pin 22 on the high end).
  • the hardness of the material of which valve pin tip 27 is comprised is typically between about 40 and about 100HRC (which is limited by the degree of wear/mechanical strength desirable for shutting the gate closed on the low end for corrosion resistant materials and is limited by the degree of machinability of the material of which the tip is comprised on the high end).
  • the corrosion rate of the material of which the stem 22 is comprised is between about 0 and about 4 mpy (mils per year).
  • the corrosion rate of the material of which the tip 27 is comprised is between about 0 and about 2 mpy.
  • the materials of which the stem 22 is comprised are selected from materials such as M390 (DIN4.2001 ), H13 (DIN1 .2344), D2 (DIN1 .2379) and M2 (DIN 1 .3343, SKH-51 ).
  • the materials of which the tip 27 is comprised are selected from materials such as Carbide, Cemented Carbide, Tantalum (Alloys), Zirconium

Landscapes

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

Abstract

L'invention concerne un appareil de moulage par injection comprenant un ensemble goupille de soupape (20) comprenant une tige (22) connectée de manière amovible à un actionneur et une partie d'extrémité distale connectée de manière amovible à une extrémité d'embout distal en aval de la tige (22), la partie d'extrémité distale (27) étant façonnée selon une configuration qui est complémentaire d'une configuration prédéterminée d'une ouverture de sorte que la partie d'extrémité distale puisse être reçue dans l'ouverture pour s'apparier avec les surfaces intérieures de l'ouverture pour fermer l'ouverture afin de stopper l'écoulement de fluide au travers de l'ouverture lors du déplacement en aval contrôlé de la goupille de soupape et de la partie d'extrémité distale, la partie d'extrémité distale (27) et la tige (22) comprenant différents matériaux, la partie d'extrémité distale (27) comprenant un matériau choisi pour être résistant à la corrosion ou résistance à l'abrasion ou l'usure ou les deux.
PCT/US2014/047789 2013-07-23 2014-07-23 Goupille de soupape en deux parties WO2015013392A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361857497P 2013-07-23 2013-07-23
US61/857,497 2013-07-23

Publications (1)

Publication Number Publication Date
WO2015013392A1 true WO2015013392A1 (fr) 2015-01-29

Family

ID=51299046

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2014/047789 WO2015013392A1 (fr) 2013-07-23 2014-07-23 Goupille de soupape en deux parties

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WO (1) WO2015013392A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015108895A1 (fr) * 2014-01-15 2015-07-23 Synventive Molding Solutions, Inc. Élément d'appareil de moulage par injection de deux matières et procédé de fabrication additive s'y rapportant
AT516523A2 (de) * 2014-11-28 2016-06-15 Rico Elastomere Projecting Gmbh Spritzgussdüse für ein Spritzgusswerkzeug
CN108819125A (zh) * 2018-09-05 2018-11-16 柳道万和(苏州)热流道系统有限公司 阀针和具有该阀针的热流道系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19836506A1 (de) * 1998-08-12 2000-03-02 Bayer Ag Heißkanaldüse mit Verschlußnadel aus Keramik
US6135757A (en) * 1998-10-16 2000-10-24 Husky Injection Systems Ltd. Valve gated injection molding system
DE102006035927A1 (de) * 2006-07-31 2008-02-14 Drei-S-Werk Präzisionswerkzeuge GmbH & Co Fertigungs-KG Werkzeugsstift für eine Werkzeugform sowie Verfahren zum Herstellen eines solchen Werkzeugstifts
DE202007017136U1 (de) * 2007-12-06 2009-04-16 Günther Heisskanaltechnik Gmbh Verschlussnadel für eine Nadelverschlussdüse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19836506A1 (de) * 1998-08-12 2000-03-02 Bayer Ag Heißkanaldüse mit Verschlußnadel aus Keramik
US6135757A (en) * 1998-10-16 2000-10-24 Husky Injection Systems Ltd. Valve gated injection molding system
DE102006035927A1 (de) * 2006-07-31 2008-02-14 Drei-S-Werk Präzisionswerkzeuge GmbH & Co Fertigungs-KG Werkzeugsstift für eine Werkzeugform sowie Verfahren zum Herstellen eines solchen Werkzeugstifts
DE202007017136U1 (de) * 2007-12-06 2009-04-16 Günther Heisskanaltechnik Gmbh Verschlussnadel für eine Nadelverschlussdüse

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015108895A1 (fr) * 2014-01-15 2015-07-23 Synventive Molding Solutions, Inc. Élément d'appareil de moulage par injection de deux matières et procédé de fabrication additive s'y rapportant
AT516523A2 (de) * 2014-11-28 2016-06-15 Rico Elastomere Projecting Gmbh Spritzgussdüse für ein Spritzgusswerkzeug
AT516523A3 (de) * 2014-11-28 2017-03-15 Rico Elastomere Projecting Gmbh Spritzgussdüse für ein Spritzgusswerkzeug
AT516523B1 (de) * 2014-11-28 2017-04-15 Rico Elastomere Projecting Gmbh Spritzgussdüse für ein Spritzgusswerkzeug
CN108819125A (zh) * 2018-09-05 2018-11-16 柳道万和(苏州)热流道系统有限公司 阀针和具有该阀针的热流道系统

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