WO2014065705A2 - Dispositif de mise en forme thermique d'un polymère et/ou d'une résine au moyen du moulage par injection et procédé de son fonctionnement (et variantes) - Google Patents

Dispositif de mise en forme thermique d'un polymère et/ou d'une résine au moyen du moulage par injection et procédé de son fonctionnement (et variantes) Download PDF

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Publication number
WO2014065705A2
WO2014065705A2 PCT/RU2013/000753 RU2013000753W WO2014065705A2 WO 2014065705 A2 WO2014065705 A2 WO 2014065705A2 RU 2013000753 W RU2013000753 W RU 2013000753W WO 2014065705 A2 WO2014065705 A2 WO 2014065705A2
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WO
WIPO (PCT)
Prior art keywords
polymer
piston
cavity
molding chamber
injection mold
Prior art date
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.)
Ceased
Application number
PCT/RU2013/000753
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English (en)
Russian (ru)
Other versions
WO2014065705A3 (fr
Inventor
Александр Андреевич МАКСИМОВ
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Individual
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Individual
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 Individual filed Critical Individual
Publication of WO2014065705A2 publication Critical patent/WO2014065705A2/fr
Publication of WO2014065705A3 publication Critical patent/WO2014065705A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29C45/34—Moulds having venting means
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum

Definitions

  • This technical solution relates to the field of engineering, in particular, the thermal molding of products from polymeric materials.
  • a piston is a cylindrical part that reciprocates inside the cylinder and serves to turn the change in gas, vapor or liquid pressure into mechanical work, or vice versa, the reciprocating motion into a pressure change.
  • a plunger is a cylindrical displacer whose length is much longer
  • the accuracy of machining parts of modern plunger and rotor plunger hydraulic machines is so high that the gap between the inner and outer cylindrical surfaces in the plunger pairs has reached
  • the main and most often used in the production parameter of the surface roughness of pistons, plungers and hydraulic cylinders according to GOST 2789-73 is R a - arithmetic mean deviation of the profile.
  • Modern surface treatment methods such as ion beam processing, provide a roughness level individual atoms and molecules, namely 3-4 Angstroms, that is (3-4) 10 "10 m. (See Simakina N.V.
  • thermoforming products from polymers including a rod with a piston, which under the action of a mechanical moving device, they are moved inside the cylindrical molding chamber heated by the heating device to the melting temperature of the polymer, and molten polymer is squeezed through the outlet into the mold volume, patent US5302104.
  • the disadvantages of this technical solution low surface quality of polymer products and the presence of voids due to the insufficiently tight fit of the polymer to the walls of the mold, the presence of gas inclusions in the polymer.
  • a known device for injection molding of polymer molded products which consists of an injection machine and mold, patent RU2284913.
  • a device for injection molding of polymer molded products consists of an injection machine and a mold. In the mold there are at least two cavity corresponding to the dimensions of the manufactured molded products.
  • the injection machine is designed as a conventional standard injection machine.
  • One channel is made in the mold for supplying molten polymer.
  • a channel is passed in the mold from the first plane of the connector and then to the second plane of the connector, from which additional channels extend to the cavities.
  • the device comprises a casting body made of a base and a lid, a molten mold, a heated container for storing the mold material, a low pressure casting furnace installed in the furnace, a gate, heating, cooling, vacuum and low pressure air supply elements.
  • a heated container for storing mold material is placed on a casting casing located on a low pressure casting furnace.
  • the molds are made according to a one-time model by filling with vacuum suction and crystallization of the material of the form in the cavity formed by the model in the foundry case. Mold material
  • US2007194474 proposes a press for molding molten polymer and / or resin by injection molding (injection press), in which there is a hydraulic cylinder and a pressure piston disposed inside the hydraulic cylinder.
  • the pressure piston divides the hydraulic cylinder into two chambers: retraction and extrusion.
  • the pump and the device for creating pressure along the axis are connected to the extrusion chamber.
  • the sensor measures the pressure in the extrusion chamber.
  • the controller receives signals from the sensor and controls the pump.
  • the pump delivers hydraulic fluid to the extrusion chamber in order to squeeze and pour through the hole (inject) the polymer / resin into the single-cavity mold by means of a piston.
  • the controller stops the pump when the pressure in the extrusion chamber reaches the set shutdown level.
  • a pressure generating device along the axis creates back pressure on the liquid in the extrusion chamber after the controller stops the pump to provide excess pressure on the injected polymer.
  • the axial pressure generating device may be a storage battery that is charged by a pump. Safe operation devices prevent the controller from turning on the pump in unsafe conditions.
  • auxiliary devices and consumables for example, a cartridge made of easily removable / easily deformable material, in order to accommodate polymer / resin.
  • thermoforming molten polymer / resin by injection molding (injection press) consisting of
  • a piston that divides the molding chamber into two cavities: a rod cavity and a piston cavity;
  • the outlet of the molding chamber is connected to the volume of the cavity of the injection mold into which molten polymer granules are supplied by moving the piston;
  • a pressure sensor connected to the input of the controller containing a microprocessor connected to a device for moving the piston is connected to the piston cavity of the molding chamber
  • the piston interacts with the polymer directly or through the disk, with the possibility of extruding the polymer / resin through the outlet from the volume of the molding chamber into the cavity of the injection mold,
  • the roughness of the outer surface of the piston and the inner surface of the molding chamber for its movement is in the range of values
  • R a is the arithmetic mean deviation
  • the size of the gap h between the outer surface of the piston and the inner surface of the molding chamber for its movement is in the range of values
  • the injection mold for feeding the polymer into the volume of the cavity has at least one hole-channel connecting the volume of the cavity of the injection mold with a vacuum device
  • At least one pressure sensor connected to the controller is connected to the volume of the cavity of the injection mold
  • thermosensors of the molding chamber and the injection mold are connected to a controller connected to a vacuum device and devices for regulating the current value in electric heaters.
  • the channel connecting the molding chamber to the volume of the cavity of the injection mold is closed with a sealing element, the polymer / resin is melted under pressure, and the molten polymer is injected by moving the piston into the cavity of the mold having a negative value compared to atmospheric.
  • a channel is opened connecting the molding chamber with the volume of the cavity of the injection mold, the polymer / resin is melted in vacuum, and the molten polymer is injected by the movement of the piston.
  • the device diagram is presented in graphic materials.
  • sealing element for example a shutter valve plug, covering the outlet of the forming chamber and the inlet of the injection mold;
  • 14 is a device for moving the rod with a piston / plunger along the axis of the forming chamber from the inlet to the outlet, controlled by electric signals from the controller, for example, containing an electric motor,
  • 15 is a sensor for measuring the temperature of the housing of the forming chamber
  • 17 is a controller containing a microprocessor
  • 18 - indicating means for example, a liquid crystal display, as well as means for entering parameter values, for example, a button or touch keyboard;
  • a vacuum device comprising, for example, a vacuum pump.
  • the device operates as follows.
  • the molding chamber (10) is installed vertically with the outlet (7) up. From below, through the inlet insert the protective disk (1 1) and slide the rod (13) with the piston / plunger (12).
  • the polymer / resin granules (8) are poured through the outlet (7). If necessary, carry out weighing and determine the weight of the filled polymer.
  • Set parameters input means, for example, manually using the keyboard (18) to the controller (17) apply signals corresponding to the parameter values.
  • the controller gives the command to start the execution of the process program.
  • the control device (19) sealing element (6) hermetically closes the outlet (7) a forming chamber with an inlet of the injection mold, leaving the cavities between them open.
  • the sealing element (6) is left open.
  • the controller (17) sends a signal to the evacuation device.
  • the polymer is melted with the sealing element (6) open, the injection mold channels (3) and the forming chamber (10) are connected, i.e. the polymer itself is melted in a vacuum. Volatile compounds and excess air are pumped out. In this case, the injection occurs only due to the movement of the piston (12, 13, 14).
  • the vacuum pump (23) is turned on and in the cavity of the injection mold (3), as well as in the volume of the forming chamber connected to it (10), air is pumped out from the initial ambient pressure p 0 and also gas evolution from the polymer to a predetermined value pi.
  • the sensor (1) sends a signal to the controller that the set Pi value has been established, the signal is sent to the electric heater control devices (16,20) from the controller (17) and they give a signal to heat the electric heaters (4,9).
  • Sensors (15,21) measure the temperature of the forming chamber (10) and the injection mold (3), respectively.
  • the initial temperature value t 0 corresponds to the ambient temperature
  • a signal is sent from the sensor to the controller and the controller (17) together with the heater control device (16) maintain the temperature at the set value level -
  • the sensor (21) sends a signal to the controller (17).
  • the controller (17) together with the heater control device (20) maintain the desired mold temperature.
  • the controller and the heater control device (16) maintain the temperature of the forming chamber at the level ti for the time required to melt all the polymer in the forming chamber.
  • the processes of heating and maintaining the set temperature values in the mold and the forming chamber occur simultaneously and run in parallel, but ti> t 2 .
  • the sealing element (6) may optionally overlap the connecting holes of the forming chamber and the injection mold.
  • polymer melting comes with a closed sealing element (6), i.e. the polymer itself melts without vacuum. Volatile compounds and excess air are not pumped out, and injection occurs due to the pressure difference in the injection mold (3) and the forming chamber (10) or due to the movement of the piston (12,13,14) during the melting of light and viscous polymers .
  • the controller (17) sends a signal to close the shutter element (22), which prevents the polymer from entering the pumping means pipeline.
  • the controller stops the vacuum pump.
  • the sealing element (6) opens the connecting holes of the mold and the forming chamber.
  • the rod (13) begins to move the piston / plunger (12), pushing the polymer melt into the injection mold (3).
  • the piston movement control device will give a signal to the controller and the rod movement will stop, it will stop and hold the polymer under pressure until the polymer cools in the injection mold (3).
  • the piston will begin to move in the opposite direction upon the command of the controller (17) and the motion control device (14) to the inlet, freeing the forming chamber.
  • the injection mold moves away from the forming chamber; it is possible to remove the finished product from the press and the injection mold.

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

Le dispositif de mise en forme thermique du polymère au moyen du moulage par injection via un orifice (une presse par injection) fait partie du domaine des constructions mécaniques et notamment de la formation d'articles en matériaux polymères. Il existe deux tendances indépendantes en matière de technologies de traitement de polymères : la 1ère est la mise en forme utilisant le vide des feuilles de polymère chauffés jusqu'au ramollissement, et la 2ème est la pulvérisation sous pression d'un polymère liquide en fusion. La solution technique proposée allie les avantages des tendances existantes grâce à la pression simultanée sur le polymère et la vidange du volume du moule de coulée par des moyens et dispositifs de mise sous vide. Cette solution technique permet d'éviter la nécessité de placer le polymère dans une cartouche, d'augmenter la précision de transfert de forme, d'éliminer le dégagement de gaz du polymère, d'augmenter sa densité, ce qui est particulièrement important pour les articles utilisés en médecine en contact direct avec les tissus humains.
PCT/RU2013/000753 2012-10-22 2013-08-30 Dispositif de mise en forme thermique d'un polymère et/ou d'une résine au moyen du moulage par injection et procédé de son fonctionnement (et variantes) Ceased WO2014065705A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2012144687 2012-10-22
RU2012144687 2012-10-22

Publications (2)

Publication Number Publication Date
WO2014065705A2 true WO2014065705A2 (fr) 2014-05-01
WO2014065705A3 WO2014065705A3 (fr) 2014-06-26

Family

ID=50545434

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RU2013/000753 Ceased WO2014065705A2 (fr) 2012-10-22 2013-08-30 Dispositif de mise en forme thermique d'un polymère et/ou d'une résine au moyen du moulage par injection et procédé de son fonctionnement (et variantes)

Country Status (1)

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WO (1) WO2014065705A2 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU937175A1 (ru) * 1980-11-03 1982-06-23 Предприятие П/Я М-5893 Способ изготовлени изделий по модел м
SU1001425A1 (ru) * 1980-11-13 1983-02-28 Московский Ордена Ленина И Ордена Трудового Красного Знамени Институт Инженеров Железнодорожного Транспорта Устройство дл запуска стартергенератора транспортного средства
US20070194474A1 (en) * 2006-02-23 2007-08-23 Nagy Peter S Injection molding press
US9315663B2 (en) * 2008-09-26 2016-04-19 Mikro Systems, Inc. Systems, devices, and/or methods for manufacturing castings
RU2455159C2 (ru) * 2010-10-01 2012-07-10 Общество с ограниченной ответственностью "Поволжский магнитный центр" Способ и устройство для получения формованных изделий из термопластичных материалов литьем под давлением
RU2456157C1 (ru) * 2011-03-16 2012-07-20 Закрытое акционерное общество "Комплексный технический сервис" Способ изготовления полимерной оснастки по моделям

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