WO2000051805A1 - Dispositif de moulage par injection et procede de production d'elements optiques et mecaniques de haute precision a partir de matiere thermoplastique - Google Patents

Dispositif de moulage par injection et procede de production d'elements optiques et mecaniques de haute precision a partir de matiere thermoplastique Download PDF

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Publication number
WO2000051805A1
WO2000051805A1 PCT/DE2000/000491 DE0000491W WO0051805A1 WO 2000051805 A1 WO2000051805 A1 WO 2000051805A1 DE 0000491 W DE0000491 W DE 0000491W WO 0051805 A1 WO0051805 A1 WO 0051805A1
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WO
WIPO (PCT)
Prior art keywords
injection molding
mold
temperature
mold cavity
molding device
Prior art date
Application number
PCT/DE2000/000491
Other languages
German (de)
English (en)
Inventor
Otto Zosel
Friedrich Scheerer
Original Assignee
Feinwerktechnik Wetzlar Gmbh
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 Feinwerktechnik Wetzlar Gmbh filed Critical Feinwerktechnik Wetzlar Gmbh
Publication of WO2000051805A1 publication Critical patent/WO2000051805A1/fr

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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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7337—Heating or cooling of the mould using gas or steam
    • 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
    • B29C45/2701—Details not specific to hot or cold runner channels
    • 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
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7312—Construction of heating or cooling fluid flow channels
    • 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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/0048—Moulds for lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00951—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2907/00—Use of elements other than metals as mould material
    • B29K2907/04—Carbon

Definitions

  • thermoplastic Injection molding device and method for producing precision optical and precision mechanical parts from a thermoplastic
  • the invention relates to an injection molding device and a method for producing precision optical and precision mechanical parts from a thermoplastic material with the features mentioned in the preamble of claims 1 and 23.
  • Precision optical parts are defined by the fact that when the surface is interferometrically checked, the maximum deviation of the surface geometry from the nominal value is a strip up to a free diameter of D ⁇ 50 mm.
  • PC polycarbonate
  • PMMA polymethyl methacrylate
  • PC polycarbonate
  • Such mechanical stress conditions in the injection molded part are the reason for the insufficient long-term stability of the injection molded part.
  • the internal flow processes forced by the mechanical stress conditions equalize the stress conditions in total or in individual areas over the course of time (relaxation) and thereby produce a partially deformed geometry of the injection molded parts.
  • the relaxation already occurs at room temperature, but can be accelerated by higher temperatures.
  • an injection molded lens with initially precision optical quality can become completely unusable in this way.
  • the remaining mechanical stress states in a precision optical injection molded part lead to the optical behavior of a quasi uniaxial crystal, ie the optical constants, such as the refractive index, become dependent on the respective mechanical stress state. This is not acceptable for precision optical parts.
  • the manufacturing process of injection molding technology also necessarily involves molecular changes in the plasticized injection molding compound, which must be carefully analyzed.
  • the plasticized injection molding compound consists of a polymeric material, ie the individual "molecules” are chains of molecules made up of 25,000 to 75,000 individual molecules, depending on the material and type. If this plasticized, amorphous mass flows from the injection molding cylinder via the sprue and the connection into the mold cavity, then the mass shows a "non-Newtonian behavior", ie the viscosity of the melt depends on the size of the shear and deformation speed. This behavior is called structural viscosity. This means the peculiarity of the melt to show better flow properties with increasing shear rate. Increasing shear rate creates a falling viscosity and thus better flow properties and vice versa. In addition, the viscosity depends on the temperature. It applies that increasing temperature also a falling viscosity and thus produces better flow properties.
  • Another effect is that the long molecular chains orient themselves in the direction of flow, regardless of whether there is a temperature gradient between the flowing mass and the runner wall.
  • the associated order in the molecular structure is expressed in the quasi-crystalline behavior of the injection molding.
  • turbulence can also arise due to sudden deflections / changes in direction and gradual changes in the sprue channel or connection cross section.
  • the defined state of order that has arisen on a straight path of the sprue channel is thereby partially changed, so that an undefined state of order is created with flow-oriented molecular chains. It has been shown that the flow orientation is irreversible and is not subject to relaxation.
  • the processes to be taken into account in the molecular area also include the shear of the thermoplastic material in the injection molding process and the thermal degradation of the thermoplastic material which is caused thereby.
  • Shear is the internal friction of the material during the filling process.
  • the internal friction arises from the speed gradient of the plasticized mass as it flows within the sprue, the connection and the mold cavity. Due to the adhesion, the flow velocity at the interface between the plasticized injection molding compound and the sprue wall is almost zero.
  • the plasticized injection molding compound moves at maximum speed in the cross-sectional center. The different speeds result in strong friction and thus shear of the chain molecules. This friction releases a considerable amount of heat. If the thermal energy generated exceeds the binding energy, for example of the -CC bond, the polymeric molecule is broken down (cracked). Precision optical parts then show a strong deviation of the optical parameters from the target values, such as refractive index and v-value (Abbe's number). The optical values differ across the cross-section of the optical component, creating streaks that are independent of the flow orientation and the internal stresses.
  • the invention is based on considerations that, in contrast to the previously common principles.
  • the focus is currently on the highest possible production speed with a stable production process.
  • the shortest cycle times can only be achieved with a thermally inert injection mold and minimum values for the temperatures of the injection molding compound and the injection mold, as well as maximum filling speeds. Rapid demoulding of the injection molding can only be achieved if the temperature of the injection mold is already close to the demolding temperature of the injection molding.
  • the plasticized injection molding compound introduced into the mold cavity must not build up any significant temperature gradients while it is flowing into the mold cavity and while it is cooling to the demolding temperature.
  • the temperature in the sprue area and in the mold cavity is at least almost the same as the injection molding compound flows in. However, the same temperatures are desirable.
  • the cooling process is to be set so that the amount of heat dissipated at the interface between the plasticized injection molding compound and the cavity wall is always the same as the amount of heat coming from the core area of the injection molding.
  • the conditions according to the invention are achieved in the injection mold used in the device in that the steel mass of the upper and lower mold parts and the mold dies is reduced in dependence on the mechanical strength in such a way that the thermal inertia is reduced allows rapid cooling adapted to the heat balance of the injection molded article to be cooled.
  • the basic idea of reducing the masses in the construction elements of the injection mold leads to an additional advantage, which is that the upper and lower mold punches and the casing of the mold cavity can be designed as replaceable parts in the upper and lower mold parts. Since the number of parts produced with an injection mold is smaller in the production of precision optical and precision mechanical injection moldings, the basic structure of the injection mold is of particular importance for economic reasons.
  • the heat balance of the injection molded part can be determined according to the type of material, material type, volume, surface and geometry using known methods. This heat balance is the basis for the construction of the injection mold.
  • the mathematically determined amount of heat, which must be removed from the injection molding prior to demolding, also serves as the basis for the temperature program to be created for the cooling process.
  • the variables known from thermodynamics, such as thermal conductivity, heat transfer, heat transfer, specific heat, are of crucial importance for the creation of the cooling temperature program, which reliably avoids the formation of a spray skin.
  • Suitable liquids are, for example, water, glycerol, water / glycerol mixtures, polyglycols, paraffins C 12 to C 6 , phthalic acid esters and chlorinated paraffins. Air, nitrogen and carbon dioxide are particularly suitable gases.
  • the heat balance of the injection molded part, the specific heat of the mold cavity material and the coolant are decisive for the selection, because the economical production for the production of precision optical and precision mechanical components also requires not only the shortest possible cycle time, but also a short one Coolant flow. It is preferable to use bronze alloys for the shell of the mold cavity, which, with suitable strength, have a higher thermal conductivity than corresponding steel alloys.
  • the course of the temperature control channels is to be arranged in such a way that a counterflow from the part of the mold cavity remote from the gate to the gate is established.
  • the head part of the die forming the mold cavity for the production of precision optical components preferably consists of a galvanically represented nickel / copper replica of a corresponding optical glass surface.
  • the material thickness of the copper replica must be about 5 mm at the thinnest point for reasons of strength
  • the back should contain ribs, which ensure through their geometric design that the heat transfer takes place evenly over the entire optical surface. This requirement also applies to the manufacture of precision mechanical components.
  • Specially shaped inserts made of highly thermally conductive material, e.g. Copper or copper alloys may be provided.
  • the molded and temperature-fit molded parts can be designed so that they are in direct contact with the temperature control and allow a homogeneous heat dissipation adapted to the heat balance.
  • the temperature program is to be set in such a way that the physically induced thermal inertia of the mass remaining after minimizing the injection mold does not unnecessarily extend the cycle time. This is achieved in that the heating of the injection mold begins again in the area of the connection before the cooling process to the demolding temperature of the injection molding.
  • At least two temperature control circuits that can be controlled or regulated independently of one another must therefore be provided.
  • the first circle runs in the connection already mentioned and the second circle surrounds the mold nest.
  • the upper limit of the temperature when heating of the mold cavity should be 1.3 to 1.5 times the glass transition temperature ET of the thermoplastic amorphous material in order to avoid the formation of a spray skin.
  • ET 100 ° C
  • the 1.1 to 1.2 times the crystallite melting point applies.
  • the non-stick layer preferably consists of a diamond layer applied in a plasma process with a thickness of 100 to 200 nm. A larger layer thickness must be avoided in order not to unnecessarily reduce the heat transfer.
  • the ratio V : H must be determined as a function of the flow length s L from the connection to the point in the mold cavity that is furthest from the connection. The following applies:
  • V L: H 12: 1 at s L ⁇ 20 mm
  • the material that cools in the mold cavity can automatically draw material from the sprue area in accordance with the change in volume, which material thus serves as a material depot.
  • the temperature programs for the sprue with the connection and for the mold cavity must run synchronously. This requirement requires control of the individual temperature control circuits that works with high reproducibility. Due to the continuous cooling, the so-called post-shrinkage of the injection molding after molding is also eliminated. This post-shrinkage, which is known in injection molding technology, usually arises from later relaxation of mechanical stresses and leads to the geometry change in the shape of the injection molding which has already been explained.
  • the highest temperature specified by the manufacturer for the injection molding compound should always be selected. This minimizes processing viscosity and shear.
  • the usual roughness depth in the sprue is around 3 to 8 ⁇ m.
  • Such a roughness favors both the "clawing” and the "swirling" of the polymeric mass on the surface of the runner and thus causes additional harmful shear.
  • the shear caused by adhesion to the surface of the runner can also be reduced by an anti-stick layer.
  • non-stick layers made of siloxane or perfluorinated polyethylene with conventional layer thicknesses of approx.
  • 0.1 mm at room temperature have a substantially lower adhesion than at the processing temperature of the thermoplastic injection molding compound, so that the coating appears to be favorable for demolding, but unfavorable for filling the mold cavity.
  • layer thicknesses of 100 to 500 nm show a significant reduction in the adhesion even at the filling temperature.
  • layer thicknesses of 100 to 500 nm should therefore be selected to minimize adhesion.
  • a thickness of approximately 100 nm has proven effective for diamond layers.
  • the optimization of the values for the injection speed or the injection pressures can only be achieved empirically.
  • the temperature program must be set according to a complete filling of the mold cavity.
  • the test criterion is the polarization-optically measured path difference in the sprue area of the test injection molded part. The following applies to precision optical parts: Maximum permissible path difference r to ⁇ ⁇ 20 nm. The following applies to precision mechanical parts: Maximum permissible path difference r to ⁇ ⁇ / 4 ⁇ 136 nm.
  • the optimal injection speed for the complete filling of the mold cavity is that which is 0.5 m / s interval lower than the injection speed determined for the test injection molding with the permissible path difference.
  • FIG. 1 shows a cross section through an injection mold
  • Fig. 2a - 2d cross sections through different form stamps
  • the injection mold 1 consists of an upper mold part 2 and a lower mold part 3, in each of which two upper mold dies 4, 5 and
  • Form lower stamp 6, 7 are inserted.
  • the head parts 8, 9 of the upper die 4, 5 and the head parts 10, 11 of the lower die 6, 7 are positively held in the upper mold part 2 and in the lower mold part 3, respectively.
  • this area is designed as an interchangeable insert 12, 13 and 14, 15, which is in positive contact with the
  • Mold upper part 2 and lower mold part 3, as well as the mold stamps 4, 5; 6, 7 stands.
  • a sprue 16, 17, which is preferably round in cross section, is incorporated in each case.
  • a brass bronze is preferably provided, in which the stamping shafts made of steel can slide with good emergency running properties.
  • the upper mold part 2 and lower mold part 3 each have base plates 18, 19, to which the foot parts of the upper mold dies 4, 5 and the lower mold dies 6, 7 are fastened.
  • the upper mold part 2 is slidably mounted perpendicular to the base plate 18.
  • the upper mold part 2 and the lower mold part 3 can be detached from one another along a separating surface 20.
  • the interchangeable inserts 12, 13; 14, 15 provided on their contact surfaces with centering edges 21, 22. Since the sprue channels 16, 17 lie in the separating surface 20, they can be processed well in terms of their shape, shape and surface quality.
  • the interchangeable inserts 12, 13; 14, 15 and the top surfaces of the upper mold punches 4, 5 and lower mold punches 5, 6 form mold cavities 23, 24, which are connected to the sprue channels 16, 17 via connections 25, 26 with a preferably rectangular cross section.
  • Plasticized plastic material is fed into the sprue channels 16, 17 via a nozzle 27 from a feed channel 28 injected.
  • the feed channel 28 can be kept at the temperature required for this via a heating band 29.
  • the device for filling and processing the plastic granules and the pressure cylinder are not shown. They correspond to conventional technology.
  • the upper mold part 2 and the lower mold part 3 are provided with temperature control channels 30, 31, which are each shown as open circles in the cross-sectional view.
  • the channels 30, 31 can be combined into a self-contained system. However, it is advantageous to design them as separate systems, which can optionally also be controlled separately in terms of temperature.
  • the channel system is designed so that the inserts 12, 13; 14, 15 with the sprue channels 16, 17 and the connections
  • Tempering channels 32, 33 are also incorporated along the longitudinal axis of the upper die 4, 5 and lower die 6, 7, which are supplied via associated supply channels in the base plates 18, 19.
  • the temperature control channels are formed by separating plates 34, 35 in a bore.
  • the temperature control element is deflected in the head part of the die.
  • the direction of flow of the temperature control means indicated by arrows in the head part can be controlled relative to the flow direction of the plastic mass injected into the mold nests 23, 24.
  • the channels 32, 33 can be combined into a self-contained system.
  • Each form stamp can be provided on its outer lateral surface with an additional temperature control device 36, 37, 38, 39, which can be heated with current, for example.
  • an additional temperature control device 36, 37, 38, 39 which can be heated with current, for example.
  • the temperature control agent preparation, the associated pumps, mixers and connections to the injection mold are not shown, since they correspond to conventional technology.
  • the base plates 18, 19 and the elements of the upper mold part 2 and the lower mold part 3 provided with the temperature control channels 30, 31 are made of steel.
  • a bronze alloy can be provided which, in addition to having good thermal conductivity, has good emergency running properties for the mold stamps used.
  • Dimensioning of the elements of the upper mold part 2 and the lower mold part 3 is chosen with the aim of reducing the mass so that the injection mold is not deformed during injection molding and sufficient temperature control of all components is ensured.
  • the diameters of the shafts of the shaping punches can be chosen so that a head surface for a maximum diameter of the injection molded parts can be represented.
  • a base body of the injection mold can be equipped with a large number of different die / insert combinations.
  • form stamps can also be used for precision mechanical components.
  • the head surface of the die 4, 5; 6, 7 must be manufactured with special care, since it determines the geometric shape of the surface of the injection molded part. Various methods are known for this.
  • a stamp 6 is shown, which is made of steel.
  • the shaft is drilled to the limit of the required mechanical stability.
  • a spirally wound flow tube with wall contact can be used here become.
  • a rib-shaped thickening 40 is provided on the head side in the central region. The temperature transition resistance is changed at this point compared to the surface edge areas.
  • the top surface of the die is covered with a glass enamel layer 41.
  • An anti-adhesive layer can also be applied in the same way.
  • Fig. 2b shows a similar form stamp, in which, however, a glass ceramic cap 42 is placed on the head surface. The cap is held with clips 43 engaging the shaft. The surface of the glass ceramic cap 42 can be brought to the desired shape using conventional optical processing methods, such as grinding and polishing.
  • FIG. 2c shows a stamp in which a molded part 44 with a particularly good thermal conductivity is incorporated in the head part.
  • a cavity corresponding to the molded part 44 can first be worked into the head part, for example by spark erosion, and then the molded part can be pressed in.
  • the molded part 44 then has direct contact with the temperature control medium flowing through the longitudinal bore, as shown in FIG. 1.
  • the molded part can also be made as a separate component and inserted into the stamp from the top.
  • the top surface can then be provided with a uniform coating.
  • the design of the molded part is selected so that there are different thicknesses and thus different temperature conductivities from the top surface of the molding die to the tempering agent.
  • the head part is provided with a cavity 45 which can be flushed through by the temperature control agent.
  • the cavity can be expanded by spark erosion almost over the entire rear surface of the head of the die pointing towards the mold cavity, as long as the mechanical strength of the die is not impaired.
  • the required temperature can be built up very quickly in the mold cavity by appropriately controlling the temperature of the temperature control medium. It is essential to avoid a shock-like cooling of the plasticized plastic mass on the head part of the die.
  • the shaping stamp is to be designed in such a way that the temperature difference to the plastic mass to be injected is as small as possible and then the temperature can be regulated depending on the temperature flow out of the injection molding.
  • the top surface of the stamping die 6 made of steel can, for example, be chemically nickel-plated, the layer thickness being approximately 5 mm. Such a layer is very homogeneous. A maximum surface roughness of 5 to 10 nm can be achieved by diamond turning.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un dispositif de moulage par injection pour produire des éléments optiques et mécaniques de haute précision à partir de matière plastique, dans un moule de moulage par injection (1) comportant une partie supérieure (2) et une partie inférieure (3) séparables l'une de l'autre, et renfermant un poinçon supérieur (4, 5) et un poinçon inférieur (6, 7) placés dans chaque cas dedans, pour délimiter la cavité du moule (23, 24), ainsi qu'un point d'injection (25, 26) guidant une matière plastifiée de moulage par injection dans la cavité (23, 24), ainsi qu'un canal d'alimentation (16, 17) pour la matière de moulage par injection sous pression. Le profil des températures dans le canal d'alimentation (16, 17) peut être régulé et le moule de moulage par injection est muni de canaux de tempérage (30, 31; 32, 33). Ce dispositif de moulage par injection se caractérise en ce qu'au moins la partie supérieure et la partie inférieure du moule (2, 3), ainsi que les systèmes de tempérage associés aux poinçons supérieurs et aux poinçons inférieurs (4, 5; 6, 7) sont séparés les uns des autres et qu'il est prévu pour les moyens de tempérage des dispositifs de régulation et/ou de commande de la température à ajustement individuels correspondants. Selon un procédé s'utilisant avec un tel moule de moulage par injection (1), il faut veiller au fait que la partie supérieure (2) et la partie inférieure (3) dans la zone du point d'injection (25, 26) et l'extrémité de tête des poinçons supérieurs et des poinçons inférieurs (8, 9; 10, 11) puissent être ajustés approximativement aux mêmes températures, par l'intermédiaire de systèmes de tempérage régulables ou pilotables indépendamment les uns des autres.
PCT/DE2000/000491 1999-03-02 2000-02-18 Dispositif de moulage par injection et procede de production d'elements optiques et mecaniques de haute precision a partir de matiere thermoplastique WO2000051805A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19908936.1 1999-03-02
DE1999108936 DE19908936C2 (de) 1999-03-02 1999-03-02 Spritzgießvorrichtung und Verfahren zur Herstellung präzisionsoptischer und präzisionsmechanischer Teile aus einem thermoplastischen Kunststoff

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Publication Number Publication Date
WO2000051805A1 true WO2000051805A1 (fr) 2000-09-08

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WO (1) WO2000051805A1 (fr)

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CN109986734A (zh) * 2019-05-09 2019-07-09 深圳大学 带流道的温度场可控化超声塑化柔性成型装置及方法
CN111941714B (zh) * 2020-07-03 2022-06-28 东莞市天沛塑料有限公司 一种eps塑料泡沫脱模工艺

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