WO1994005482A1 - Extrusionswerkzeug für mit einem hohlraum versehene bauteile, sowie verfahren zum herstellen derartiger bauteile - Google Patents
Extrusionswerkzeug für mit einem hohlraum versehene bauteile, sowie verfahren zum herstellen derartiger bauteile Download PDFInfo
- Publication number
- WO1994005482A1 WO1994005482A1 PCT/AT1993/000135 AT9300135W WO9405482A1 WO 1994005482 A1 WO1994005482 A1 WO 1994005482A1 AT 9300135 W AT9300135 W AT 9300135W WO 9405482 A1 WO9405482 A1 WO 9405482A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cavity
- extrusion tool
- tool according
- component
- coolant
- Prior art date
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Classifications
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
- B29C48/902—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies internally
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/904—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using dry calibration, i.e. no quenching tank, e.g. with water spray for cooling or lubrication
Definitions
- Extrusion tool for components provided with a cavity, and method for producing such components
- the invention relates to an extrusion tool for components provided with a cavity and a method for producing such components with a cavity, as described in the preamble of claims 1 and 42.
- Coolants for evaporator cooling systems or oil are often provided in the calibration devices in order to ensure that the wall elements of the components are in contact with the alignment surfaces of the calibration devices via an evacuation of the openings.
- openings are often provided in the calibration devices in order to ensure that the wall elements of the components are in contact with the alignment surfaces of the calibration devices via an evacuation of the openings.
- heat dissipation in particular in the case of hollow profile-like components, such as tubes, window profiles, shaped tubes and the like, it is also provided that heat is removed from the interior of the cavity of the component.
- This heat dissipation can now - according to DE-C2-20 28 538, AT-B-387 355, DE-AI 24 55 779, DE-C2-32 41 005 and DE-C3-25 06 517 - take place in that after the component emerges from the nozzle gap, cooling water is injected into the internal cavity in order to ensure adequate cooling of the component and a correspondingly high heat dissipation.
- the disadvantage of this method is that the efficiency of the cooling is poor and that an exact calibration is usually prevented by the cooling device.
- EP-A2-0 047 378 and DE-C2-33 15 202 also proposed to introduce liquid nitrogen at very low temperatures into the cavity of the component, which then evaporates and thus removes heat from the surrounding partial areas of the component.
- such processes are very cost-intensive since the costs for such noble gases as nitrogen and for their liquefaction are very high.
- it is inside the components When using liquefied gases, there are very strong temperature differences, which adversely affect the quality of the manufactured components.
- the present invention is based on the object of providing an extrusion tool for components with cavities and a method for producing such components, with which the molecular structure of the components to be produced can be cooled or frozen more quickly after emerging from the die gap and thus a better one Dimensional accuracy of the components achieved and the production speed for such components can be increased.
- An embodiment of the extrusion tool according to claim 2 is also advantageous, since it quickly changes the temperature of the heat exchanger to different conditions. gene can be adjusted.
- An embodiment according to claim 3 is also advantageous because, due to the smaller cross-sectional dimensions of the heat exchanger, the component is prevented from getting stuck even when the component is started up, that is to say when an extrusion line is started up, and the surfaces in the region of the inner cavity are prevented by the heat exchanger not be damaged.
- this design of the heat exchanger as a hollow profile body enables better circulation and circulation of the further coolant in the cavity of the component.
- Another embodiment variant describes claim 4, whereby both the inner and the outer surface of the hollow profile body of the heat exchanger can be used for heat transfer between the coolant and the heat exchanger in order to simultaneously use the radiant cold of the heat exchanger.
- an embodiment according to claim 6 is also advantageous, since cooling media which are immiscible with water or air and have a high heat absorption capacity can also be used for cooling the heat exchanger.
- the further embodiment according to claim 8 enables a sufficient circulation of the further coolant to be achieved in the area of the heat exchanger, so that an intimate heat transfer between the coolant heated by the inner surface of the cavity and the coolant in the heat exchanger is achieved becomes.
- an embodiment according to claim 9 is also advantageous, since as a result a portion of the heat energy absorbed in the cavity can be dissipated via the amount of air carried through this cavity in the extrusion direction without impairing the work on the end of the component facing away from the nozzle gap, where some of the heat can first be transferred from the component to the heat exchanger by circulating the air in the area of the heat exchanger and in which a certain amount of residual heat can be discharged through the cavity of the profile.
- the development according to claim 14 ensures that, if the further coolant in the cavity of the component is properly circulated, the discharge of a certain proportion of the coolant in the longitudinal direction of the component is not hindered.
- the arrangement of the outflow opening is expedient, since the outflow of a certain portion of the further coolant in the extrusion direction through the cavity and through the open end face facing away from the nozzle gap into the open can be easily realized.
- Coupling in the longitudinal direction of the components can be easily achieved by using spacers.
- a high dimensional accuracy of the dimensions of the cavity in the component is achieved by the training according to claim 19.
- the inner surfaces of the cavity can be snugly applied to the caliber, so that the cavity takes over the corresponding dimensions of the caliber exactly.
- an embodiment according to claim 21 is also advantageous, since in this way, thermal energy can additionally be dissipated from the inner surface of the cavity of the component via the gas or the air or the liquid extracted to produce the vacuum.
- a more precise regulation of the vacuum is possible, however, if, in addition to the venturi nozzle arrangement forming the circulating device, a separate venturi device is used for generating the vacuum in the area of the calibration device, as is protected in claim 22.
- a full contact of the components with the calibration device arranged in the cavity of the component can be achieved by the development according to claim 23.
- Claim 27 describes a solution with little effort for the heat exchanger, since for the function of the cooling elements only electrical energy has to be introduced into the cavity of the component in order to cool the coolant moved with the circulating device more strongly. This is done in such a way that the coolant, for example partially supplied from the outside, is additionally cooled in the cavity. The resulting waste heat from the Peltier element is removed from the cavity via the cooling medium.
- This type of internal cooling means that the device according to the invention can also be used in cavities with small cross sections, which, however, are important for the function of the components due to their dimensional accuracy. To increase the cooling capacity, an embodiment according to claim 28 is also possible.
- the embodiment according to claim 29 enables at least internal cooling of the component over that area in which the outer surfaces of the components are usually very intensively and strongly cooled by external calibres. Due to the simultaneous cooling also in the cavity, the build-up of internal stresses or a warpage of the component can be avoided during this cooling process.
- the embodiment variant according to claim 30, on the other hand, enables a correspondingly graduated cooling to take place practically over the entire length of the external cooling on the inside of the component, that is to say from the inner surface of the cavity.
- a uniform solidification and freezing the individual NEN • molecules of different materials, in particular plastics achieved, the build-up of internal stresses and the risk of hardness cracks or the like so that. Is avoided in an advantageous manner.
- a further development according to claim 32 is also advantageous, since in addition to the circulation of the coolant inside the cavity, a predeterminable proportion of heated coolant can also be discharged to the outside through the cavity in the longitudinal direction.
- the design according to claim 34 enables a considerable increase in the amount of heat that can be absorbed without great expenditure on device technology.
- Stress-free components can above all be designed according to the claim 35 can be achieved, since in the case of several cavities in one component, a stress-free and distortion-free component can be achieved by uniform cooling.
- an embodiment 38 is also particularly advantageous, since this allows the cooling process to be monitored over a larger longitudinal region of the component.
- An embodiment according to claim 40 can also prove advantageous.
- a further development according to claim 41 has the advantage that the internal cooling device can be removed relatively quickly for maintenance work or when starting up the component, thereby preventing damage to the same or making work more difficult when starting up the component.
- the invention also includes a method as characterized in the characterizing part of claim 42.
- a refrigerant is introduced between the individual melt or partial melt strands into the cavity, it is possible to cool the interior of a hollow profile-like component over the entire cross-section, ie over the entire inner surface, and thereby a uniform one Heat dissipation from outside and from inside the component.
- This enables the production of torsion-free or stress-free components, in particular hollow profiles. Because the coolant is circulated inside the cavity, the efficiency in cooling the internal Ren surface of the cavity are significantly reinforced without an increased amount of cooling medium has to be circulated inside the cavity.
- FIG. 1 shows a plant for the production of hollow profile-like components, in particular tubes, shaped tubes, hollow profiles, in particular from plastics, in a side view and in a simplified, schematic representation;
- FIG. 2 shows the extrusion tool for producing a molded part, in a side view, cut, according to lines II-II in FIG. 3 and also in a simplified, schematic representation;
- FIG. 3 shows the extrusion tool according to FIG. 2 in an end view, sectioned, along the lines III-III in FIG. 2;
- FIG. 4 shows a part of the extrusion die and a part of the component adjoining the die gap, in which an internal cooling device is arranged, in a top view, in section, according to lines IV-IV in FIG. 5 and a simplified, schematic illustration;
- Fig. 6 shows a part of the extrusion tool designed according to the invention Section of the internal cooling device in front view;
- Figure 8 shows the circulating device in front view, sectioned, along the lines VIII-VIII in Figure 7;
- FIG. 9 shows a profile with a part of another embodiment of a circulating device according to the invention in a side view, sectioned and simplified schematic representation
- connection device for the internal cooling device according to the invention in a side view, in section and in a greatly simplified schematic representation
- FIG. 11 shows an embodiment variant of an extrusion tool with a plurality of inner cooling devices arranged one behind the other in the extrusion direction in a side view and a schematic representation
- FIG. 12 shows a part of the internal cooling device according to FIG. 4 with additional cooling elements arranged in the area of the heat exchanger.
- Fig.l is a system 1 for producing a component 2, e.g. a tube or a hollow profile shown preferably made of plastic.
- This system 1 comprises an extruder 3, an extrusion tool 4 for extruding and the extrusion tool 4, in the extrusion direction - arrow 5 - downstream calibration devices 6, 7 and a cooling device 8.
- This cooling device 8 is usually a take-off device and a separating device for producing component sections the same size of the endless extruded component or the profile.
- hollow profile-like components 2 with different cross-sectional shapes e.g. Window or door profiles.
- the extrusion tool 4 is shown on a larger scale and in section.
- One of a screw 9 of a preferably as a twin screw extruder formed extruder 3 ejected melt strand 10 is divided into two melt strands 12 and 13 in a distributor 11 of the extrusion die 4.
- the inlet duct 14 adjoining the outlet of the extruder 3 is divided into two flow ducts 15, 16 diverging to the direction of extrusion, according to arrow 5, which have an essentially circular or oval cross-section and in which distribution ducts 17 and 18 are arranged, in which the partial melt strands 12 or 13 are converted into a plurality of single melt strands 19 and then into a coherent melt web 20 enveloping a core.
- the flow channels 15 and 16 open into a nozzle gap 21 of a nozzle lip 22 of a nozzle arrangement 23.
- the extrudate emerging from the nozzle arrangement 23 or a window profile 24 forming the component 2 can be arranged in the calibration devices 6, 7 downstream of the nozzle arrangement 23, of which the calibration device 6 the outside surfaces of the window profile 24 and the calibration device 7 at least the inside surfaces in are assigned to a cavity of the window profile 24, deformed to its final dimensions and cooled in the cooling device 8 that follows.
- the calibration device 7 is arranged in the interior of the component 2, that is to say in a cavity 26 of the window profile 24 which is of hollow profile and for example forms the component 2.
- This calibration device 7 is connected in the cavity 26 of component 2 in the extrusion direction - arrow 5 - to an internal cooling device 27, of which a heat exchanger 28 can be seen in FIG.
- This heat exchanger is connected via supply lines 29, 30 to a cooling unit 31 arranged outside the component 2 or outside the extrusion tool 4.
- the supply line 30 is connected with an outlet of a pump 32 to a connected inlet 33, while the supply line 29 is connected to a return 35 located on a tank 34.
- a coolant 36 is contained in the tank 34, which is repeatedly supplied to the heat exchanger 28 via the supply line 30 by the pump 32 and the coolant heated in the heat exchanger is returned to the tank 34 via the supply line 29.
- the tank 34 is connected via lines 37 to a cooler 38 of the cooling unit 31, in which the cooling medium 36, preferably water 39, by air or water circulation cooling, as schematically indicated by an arrow 40, to the desired position Inlet temperature for the heat exchanger 28 is cooled.
- the cooler 38 can be designed in accordance with the embodiments known from the prior art and can have a closed cooling circuit with a refrigerant or a continuous water cooler or continuous air cooler or the like for cooling the cooling medium 36.
- the water 39 is preferably cooled to temperatures below 0 ° C. in order to absorb a correspondingly high amount of heat, for which purpose it is expedient if the water 39 is mixed with an antifreeze 41.
- the pump 32 for circulating the cooling medium in the supply lines 29, 30 and the heat exchanger 28 can be formed by a centrifugal pump or any other pump.
- the pump 32 is preferably designed as a piston pump, since it is possible with this type of pump to feed relatively large amounts of liquid into the supply line 30 under very high pressures, so that a large amount of cooling medium via small cross sections of the supply lines 29, 30 to the heat exchanger 28 can be supplied. If piston pumps are used, it is then also possible, among other things, to work in the supply lines 29, 30 with pressures of 100 bar and more, whereas when using centrifugal pumps, pressures between 10 and 50 bar are usually used.
- the supply lines 29, 30 are guided past distribution channels 17, 18 and through a core 42 of the extrusion tool 4 into the cavity 26 of the component 2. There they then pass through the calibration device 7, which is likewise arranged in the cavity 26 of the component 2, with simultaneous cooling, and open into the heat exchanger 28.
- a circulating device 44 is provided in the area of the heat exchanger 28, the effect of which will be explained even better with reference to the following figures.
- this circulation device 44 uses, for example, the air 45 present in the cavity 26 as a coolant 46 and circulates in the cavity according to the corrugated arrows 47, or a portion of the air 45 heated during the circulation, according to the schematic corrugated ones Arrows 48, in the extrusion direction - arrow 5 - are discharged to the open end of the cavity 26.
- a supply unit 49 can be arranged, with which a compressed gas is supplied through a feed line 50.
- the feed line 50 can in turn be passed through the core 42 of the extrusion die 4 and, if present, through the calibration device 7, which is arranged in the interior of the cavity 26.
- a supply line 51 can also run through the core 42, which leads from a vacuum generator 52 to the calibration device 7 in the cavity 26 of the component 2.
- the vacuum built up via the supply line 51 is required in order to suck in the inner surface 43 of the component 2 via suction openings 53, which, as indicated schematically, can be formed by bores or slots, and to guide it along the surface of the calibration device 7 in order to ensure exact dimensioning and shaping of this inner surface 43.
- the component 2 is frozen or solidified in the desired dimensions in the area of the subsequent internal cooling device 27, so that a high degree of dimensional accuracy can be achieved in the manufacture of components 2 with the present extrusion tool 4.
- plastic 54 used to manufacture the components 2 is a recycling material or a primary material.
- the type of plastic used for component 2 can be of any type, and all plastics suitable for this, such as PVC, polyethylene, ABS or the like, which can be processed by extrusion, can be used.
- FIG. 3 shows the passage of the feed line 50 or the supply lines 29, 30, 51 into the core 42 of the extrusion die 4.
- the aforementioned supply line 50 and the supply lines 29, 30, 51 are guided through a distribution plate, also referred to as a mandrel plate 55.
- This has a plurality of flow channels 15, 16 distributed in the circumferential direction, through which melt single strands 19 are passed. Between these flow channels 15, 16, the feed line 50 or the supply line 29, 30, 51 are slid into a central area or into the area of a center point 56 of the mandrel plate 55, in order to then within the distribution channels 17, 18, which pass through the circumference Production of the melt web 20 causes the core 42 to pass through in the direction of the cavity 26 of the component 2.
- this mandrel plate 55 can also be designed as an annular plate in which Ren inner opening 57, the supply lines 29, 30, 51 and the feed line 50 are deflected by 90 degrees in order to then pass through the core 42 in the direction of extrusion - arrow 5 -.
- the core 42 is held in the extrusion tool 4 by means of stud bolts 58.
- the feed line 50 and the supply lines 29, 30, 51 are thermally insulated from the parts of the mandrel plate 55 or the core 42 surrounding them via insulating materials 59, so that the heat balance in the region of the nozzle arrangement 23 is not disturbed and, above all, the flowability of the Plastic 54 in the area of the nozzle arrangement 23 is not adversely affected by undesired cooling.
- FIG 4 shows the area of the component 2 in plan view and in section, in which the internal cooling device 27 is arranged.
- the supply lines 29, 30 are passed through the core 42 with the interposition of insulating material 59.
- the continuous, coherent material web forming the component 2 exits the nozzle arrangement 23 of the extrusion tool 4 through the nozzle gap 21 between the nozzle lips 22.
- the calibration device 7 is arranged in the cavity 26 of the component 2.
- the external dimensions of the calibration devices 7, which are preferably composed of a plurality of individual segments 60, have exactly the desired cross-sectional dimension of the cavity 26. If necessary, the external dimensions can be taken into account the shrinkage dimension for plastics 54 may be somewhat larger than the final dimension of component 2 in the region of cavity 26 or the hollow chamber.
- this or its segments 60 are provided with suction openings 53, which are connected via a connecting line 61 to a collecting space 62 between the nozzle arrangement 23 and the calibration device 7 stand.
- An inlet opening of the supply line 51 which is connected to the vacuum generator 52, also protrudes into this collecting space 62, so that the entire collecting space 62 as well as the connecting lines 61 and the suction openings 53 are evacuated in order to fill the inner surface 43 of the component 2 with the vacuum to apply to the surface of the calibration device 7 or its segments 60.
- cooling can take place in this area if, for example, the supply line 29 is passed through the calibration device 7 with the interposition of distribution channels, as indicated schematically by dash-dotted lines, so that the component 2 is already precooled in the area of the calibration device 7.
- the feed line 50 which is required for operating the circulating device 44, which in the present case is formed by a venetian nozzle arrangement 63, is then passed through the calibration device 7.
- This venturi nozzle arrangement 63 serves to suck in the air located between an outer surface of the cooling device 8 and the inner surface 43 of the component 2, indicated schematically by arrows 64, through suction openings 64 ′ and to lead it over a heat exchanger 65 of the cooling device 8 and thereby cool it.
- the air cooled when passing the heat exchanger 65 can then, as schematically, by corrugated
- Arrows 66 is indicated, through flow openings 67 which are arranged in a heat exchanger 65 formed by a hollow profile body 68, reenter the air space between the component 2 and the cooling device 8 and is thereby circulated.
- a certain proportion of the circulated air as indicated schematically by arrows 69, to extend in the direction of extrusion - arrow 5 -, ie in the longitudinal direction of the component 2 open end of the same is moved through and exits from there into the ambient air.
- the air can also be sucked back over larger longitudinal regions of the component 2 in the extrusion direction along the inner surface 43 of the component 2, so that intensive cooling of the component 2 from the inside over a large longitudinal region forth.
- This intensive cooling is particularly advantageous when components, for example window profiles with large wall thicknesses, are produced, or as a result a substantial increase in the extrusion speed is possible.
- this can additionally increase the output of an extruder 3 regardless of the properties caused by the material to be processed.
- an outlet 70 from the venturi nozzle arrangement 63 for example by arranging outflow openings 71 shown schematically in FIG. 4, which are arranged, for example, in the radial direction or obliquely to the direction of extrusion - arrow 5 - it is also possible swirling of a coolant 72, e.g. To effect air, which is supplied via the feed line 50, in the manner of a cyclone, so that the air flow moves in the manner of a helical spiral along the wall of the hollow profile body 68 of the cooling device 8 or flows around the heat exchanger 65. This allows an intimate heat exchange to take place between the coolant 72 and the heat exchanger 65 and subsequently between the coolant 72 and the component 2 or its inner surface 43.
- a coolant 72 e.g.
- a length 73 of the internal cooling device 27 extends at least over that length 73 - shown in FIG. 1 - over which the component 2 is assigned the calibration devices 6 for calibrating the outer surface of the component 2. Due to the uniform heat dissipation from the inner and outer surface of the component 2, stress-free cooling and a stress-free freezing of the plastic molecules over the length of the component 2 are achieved.
- FIG. 5 shows a segment 60 of the calibration device 7 in a front view.
- the arrangement of the suction openings 53 which can be designed in the manner of a slot, can be seen from this illustration, as can the arrangement of a central line 74, which allows the air to be removed centrally from the area of the suction openings 53, for example into the supply line 51 enables or if this central line 74 is closed in the direction of the supply line 51 and is opened in the direction of the valve nozzle arrangement 63, the vacuum is built up via the venturi nozzle arrangement 63.
- the supply line 50 for the coolant 72 for cooling the cavity 26 of the component 2 and for driving the Venturi nozzle arrangement 63 can also be passed.
- the segment 60 is designed such that only upper and lower sides 75, 76 abut the caliber surfaces.
- cavities 26, 79, 80, 81, 82, 83 can be arranged in a component 2, in the present case a window profile.
- cavity 79 is also assigned an internal cooling device 27.
- the supply lines 29, 30 and the feed line 50 are in turn arranged in this internal cooling device 27, as is also the case with the internal cooling device 27 in the cavity 26.
- the calibration device 7 is designed such that all inner walls of the cavity 79 are calibrated, i.e. be brought to the right, desired level. With this calibration device 7 it is also possible, as shown with the aid of the calibration device in the cavity 26, to arrange suction openings 53 in order to ensure that the surface of the cavity 79 contacts the calibration device 7 by means of vacuum.
- Corresponding calibration devices 7 or internal cooling devices 27 can of course also be arranged in the further cavities 80 to 83, if this is essential for the dimensional accuracy of the component 2.
- FIG. 6 shows the internal cooling device 27 in the cavities 26 and 79 in the area of the heat exchangers 28 and 84, respectively. This illustration also shows that
- Flow-through openings 67 for circulating a coolant 72, in particular air, in the cavity 26 or 79, according to the arrows 66, can be arranged in a surface 86 facing away from a direction of gravity - arrow 85 - or in side surfaces 87 of the hollow profile body 68.
- a height dimension 88 can be smaller than an internal height 89 of the cavity 26 and a width 90 may be smaller than a minimum inner width 91 of the cavity 26.
- a heat exchanger 65 which has already been described in more detail in the preceding figures, can also be arranged in the interior of the hollow profile body 68 in order to cool the coolant 72 to be circulated, according to the arrows 66, by means of the circulating device 44 described above.
- This can consist, for example, of a spiral tube or also of evaporator surfaces through which the air to be cooled or the coolant 72 can flow in different directions. All designs known from the prior art for such heat exchangers can be used for this.
- a hollow profile body jacket 92 of the internal cooling device 27 is formed with a circular cross section, in which, for example, the cooling medium supplied via the supply lines 29 and 30, in particular a cooling liquid, is pressed through spirally arranged pipes or channels 93.
- the outer dimensions of the hollow profile body jacket 92 are selected to be smaller than the corresponding cross-sectional dimensions of the cavity 26.
- the hollow profile body jacket is in turn penetrated in the radial direction by through-flow openings 67 which connect a interior 94 of the hollow profile body jacket 92 and the surrounding air space 95.
- a venturi nozzle arrangement 63 which forms the circulation device 44 and enables circulation of the coolant 72, for example a gas, in particular air, according to the arrows 66 and 64, is in a continuous wall in an end wall 96 in the end region 97 of the hollow profile body of the internal cooling device 27 Bore 98 is arranged, which extends in the direction of extrusion - arrow 5.
- a side facing the nozzle gap 21 is designed as a suction inlet 99 for the coolant 72, while the end of the bore 98 facing the interior of the hollow profile body or the hollow profile body shell 92 is designed as an outflow opening 100.
- an end of the feed line 50 which is designed as a nozzle 101 and with which a pressurized coolant 72, preferably air or another gas, which can also be mixed with liquid nitrogen, for example, projects into this bore 98 a presettable pressure, for example between 2 and 30 bar, preferably 10 bar, is supplied.
- a pressurized coolant 72 preferably air or another gas, which can also be mixed with liquid nitrogen, for example
- this configuration creates a venturi nozzle arrangement 63 in which, in the area of the suction inlet 99, the physical effect of such a venturi nozzle arrangement 63 in Depending on the amount of coolant 72 supplied via the supply line 50 or the pressure thereof and the pressure difference between the supply line 50 and the interior of the hollow profile body jacket 92, a negative pressure is built up which releases the air from the air space 95 surrounding the hollow profile body jacket 92 sucked in according to arrows 64 and entrained in the direction of the extrusion direction - arrow 5 - which coincides with the outflow direction.
- FIG. 9 shows an embodiment variant of an internal cooling device 27 with a circulation device 44, in which the circulation device 44 is formed by a blower 104. is det, which is driven via a drive 105 via the coolant 72 supplied via the feed line 50.
- the drive 105 is designed as an air motor, and the outflowing air from the drive 105 can also be used to cool the cavity 26 of the component 2, whereas the circulation of the coolant or the air in the cavity can be done by means of the Blower 104 takes place.
- the fan 104 or a turbine it is of course also possible for the fan 104 or a turbine to be driven via the cooling medium 36, which is transported in a closed circuit via the supply lines 29 and 30. In this case, a corresponding liquid drive must be provided. However, it would also be possible to operate the blower 104 or a turbine via an electric motor, the energy being able to be supplied via a supply line through the core 42 of the extrusion tool 4.
- FIG. 10 also shows a connecting device 106, with which the internal cooling device 27 can be attached to the core 42 of the extrusion die 4, for example in the manner of a quick-release fastener, if necessary with the calibration device 7.
- the supply lines 29, 30 and 51 are arranged on a coupling extension 107 in predetermined coordinates.
- a single or multiple plug 108 can also be provided, which can be connected to a control device 110 via a line 109.
- This coupling attachment 107 is now assigned a coupling plug 111, on which protruding coupling extensions 113 for the supply lines 29, 30 and 51 are arranged over an end face 112 thereof.
- a plug part 114 provided with projecting plug elements is arranged opposite the multiple plug 108.
- Corresponding sealing elements 116 can also be arranged in the receptacles 115 arranged in the coupling projection 107, so that after the coupling extensions 113 have been pushed into the receptacles 115, a fluid-tight connection of the supply lines 29, 30, 51 and a flawless line connection is produced between the plug part 114 and the multiple plug 108.
- a union nut 117 can be provided which engages in a thread 118 on the coupling projection 107.
- a plurality of heat exchangers 65 can be arranged one behind the other in a cavity 26 of a component 2 in the direction of extrusion - arrow 5. These are preferably supplied with cooling medium via common supply lines 29, 30. However, it is theoretically possible, in particular for cavities 26 with large dimensions and large components and components 2 with large cross-sectional dimensions, at least for some of these heat exchangers 65 separate connections to arrange supply lines 29, 30 for the cooling medium.
- this embodiment variant shows that in the area of the calibration device 7 and in the area of the heat exchangers 65 one or more measuring devices 119 to 127 for determining the temperature of the coolant or the cooling medium and the temperature of the cooling medium or can be arranged on the surface of the component 2.
- measuring devices 119 to 127 can be connected to the control device 110 via a line 109.
- a computer unit 128 and memory units 129 and programming devices 130 assigned to it can influence and control both the discharge speed of the extruder 3 and the vacuum generator 52 or the supply unit 49 and the pump 32 or the cooling unit 31.
- FIG. 12 shows an embodiment variant in the design of the internal cooling device 27 already shown with reference to FIG. 4 and explained in more detail.
- thermoelectric cooling elements 133 are arranged on an outer surface 131 of the meandering bent pipe 132, which forms the heat exchanger 65.
- thermoelectric cooling elements are connected via a line 134 to a power supply source outside the extrusion die 4.
- These cooling elements are so-called semiconductor heat pumps which, using the Peltier effect, convey heat energy from a cold surface 135, which faces the coolant 72 circulated with the circulating device 44, through the cooling element 133 to a warm surface 136.
- the energy conveyed to the warm surface 136 is discharged from the cavity 26 to the outside via the cooling medium 36 flowing through the pipeline 132.
- the effect of the coolant 72 can thereby be multiplied, since the effect of the heat exchanger 65, in particular its efficiency, can be multiplied by the arrangement of the cooling elements 133, which are also referred to as Peltier elements.
- the warm surface 136 is in contact with the outer surface 131 of the pipeline 132
- the warm surface 136 is ei ⁇ NEN forms part of the outer jacket of the pipeline 132.
- a similar effect can also be achieved if the warm surface 136 is adjacent to the outer surface 131 of the pipeline 132 at a short distance, so that the radiated heat can also be dissipated via the cooling medium 36.
- cooling elements 133 The design and arrangement of the cooling elements 133 is left to the person skilled in the art, although it is of course also possible, in reverse, to have a plurality of heat exchangers 65 connected in series in the region of the supply lines 29 and 30 of such Peltier elements connecting them ⁇ te or to arrange cooling elements 133 that can be used to turn the cold surface 135 to the supply lines 29 and 30 and that on the dissipate warm surface 136 via the gaseous coolant 72 or 46 blown through the cavity 26.
- FIGS. 1; 2.3; 4-6; 7.8; 9; 10; 11; 12 shown embodiments form the subject of independent solutions according to the invention.
- the tasks and solutions according to the invention in this regard can be found in the detailed descriptions of these figures.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU49328/93A AU4932893A (en) | 1992-09-01 | 1993-09-01 | Extruder for components having a cavity, and a method of producing such components |
DE4394174T DE4394174D2 (de) | 1992-09-01 | 1993-09-01 | Extrusionswerkzeug für mit einem Hohlraum versehene Bauteile, sowie Verfahren zum Herstellen derartiger Bauteile |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0174592A AT409474B (de) | 1992-09-01 | 1992-09-01 | Extrusionswerkzeug für mit zumindest einem hohlraum versehene bauteile sowie verfahren zum herstellen derartiger bauteile |
ATA1745/92 | 1992-09-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994005482A1 true WO1994005482A1 (de) | 1994-03-17 |
Family
ID=3520096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT1993/000135 WO1994005482A1 (de) | 1992-09-01 | 1993-09-01 | Extrusionswerkzeug für mit einem hohlraum versehene bauteile, sowie verfahren zum herstellen derartiger bauteile |
Country Status (4)
Country | Link |
---|---|
AT (1) | AT409474B (de) |
AU (1) | AU4932893A (de) |
DE (1) | DE4394174D2 (de) |
WO (1) | WO1994005482A1 (de) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL9400937A (nl) * | 1994-06-09 | 1996-01-02 | Tech Ind W J Van Der Sar B V | Werkwijze en inrichting voor het vervaardigen van een naadloos doorzichtig kokerprofiel. |
WO1996023644A1 (en) * | 1995-02-01 | 1996-08-08 | Wavin B.V. | Method for producing a thermoplastic tubular profile and internal cooling unit for such a method |
EP0788869A1 (de) * | 1996-02-06 | 1997-08-13 | Hoechst Aktiengesellschaft | Verfahren zum Herstellen von dickwandigen Rohren aus Polyethylen |
DE29809587U1 (de) * | 1997-03-12 | 1998-11-26 | Lupke Manfred Arno Alfred | Vorrichtung zum Formen von Kunststoffteilen |
WO2000013877A1 (de) * | 1998-09-09 | 2000-03-16 | HÄFNER, Gerhard | Vorrichtung zur herstellung von rohren |
WO2004022309A1 (en) * | 2002-09-09 | 2004-03-18 | Lupke Manfred Arno Alfred | Pipe mold apparatus with contact and contactless air cooling of plastic in a mold tunnel |
AT412771B (de) * | 1997-06-26 | 2005-07-25 | Greiner & Soehne C A | Extrusionswerkzeug für eine kunststoffschmelze |
AT412767B (de) * | 2000-03-03 | 2005-07-25 | Greiner Extrusionstechnik Gmbh | Verfahren zum herstellen von länglichen gegenständen sowie mit diesem verfahren hergestellter gegenstand |
WO2006134228A1 (en) * | 2005-06-15 | 2006-12-21 | Oy Kwh Pipe Ab | Method and device for internal cooling of extruded thermoplastics pipes |
US7632086B2 (en) * | 2003-10-03 | 2009-12-15 | Exxonmobil Chemical Patents Inc. | Melt fracture reduction |
DE102018113663A1 (de) * | 2018-06-08 | 2019-12-12 | Volkswagen Aktiengesellschaft | Verfahren zur In-Prozessmessung von Prozessparametern und Bauteileigenschaften bei der Herstellung von Hohlprofilen sowie eine Messvorrichtung hierfür |
IT201900018920A1 (it) * | 2019-10-15 | 2021-04-15 | Tecno System Srl | Dispositivo per estrusione di materie plastiche con raffreddamento ad azoto e metodo di estrusione |
WO2021073865A1 (de) * | 2019-10-15 | 2021-04-22 | Unicor Gmbh | Vorrichtung und verfahren zur herstellung von kunststoffrohren unter einsatz eines kühldorns mit sensoreinrichtung |
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DE2523975A1 (de) * | 1975-05-30 | 1976-12-16 | Veba Chemie Ag | Vorrichtung zur herstellung spannungsarmer rohre aus thermoplastischem kunststoff |
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GB1129626A (en) * | 1965-03-08 | 1968-10-09 | Kureha Chemical Ind Co Ltd | Method and apparatus for successively moulding hollow articles of thermoplastic resins |
DE2028538C2 (de) * | 1970-06-10 | 1984-10-18 | Dynamit Nobel Ag, 5210 Troisdorf | Verfahren und Vorrichtung zur Herstellung von Mehrkammerprofilen aus Thermoplasten |
DE2455779A1 (de) * | 1974-11-26 | 1976-08-12 | Johannes Weber | Verfahren und vorrichtung zum abkuehlen von oberflaechen an extrudierten profilen aus kunststoff |
DE2506517C3 (de) * | 1975-02-15 | 1978-03-30 | Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid | Vorrichtung zur Flüssigkeits-Innenkühlung von stranggepreßten Rohren oder Schläuchen |
DE3033054A1 (de) * | 1980-09-03 | 1982-04-01 | Messer Griesheim Gmbh, 6000 Frankfurt | Verfahren und vorrichtung zur kuehlung von kunststoff-hohlprofilen |
SE434930B (sv) * | 1982-04-29 | 1984-08-27 | Aga Ab | Forfaringssett och anordning for att invendigt kyla extruderade rorformiga foremal med hjelp av flytande kveve |
DE3241005A1 (de) * | 1982-11-06 | 1984-08-02 | Battenfeld Maschinenfabriken Gmbh, 5882 Meinerzhagen | Verfahren und vorrichtung zur kuehlung von hohlprofilen, insbesondere rohren oder schlaeuchen, aus thermoplastischem kunststoff waehrend des extrudierens |
AT387355B (de) * | 1983-04-19 | 1989-01-10 | Cincinnati Milacron Austria | Kuehlvorrichtung |
NL8502034A (nl) * | 1985-07-15 | 1987-02-02 | Leer Koninklijke Emballage | Inrichting voor het vervaardigen van een buisvormig voorwerp. |
-
1992
- 1992-09-01 AT AT0174592A patent/AT409474B/de not_active IP Right Cessation
-
1993
- 1993-09-01 AU AU49328/93A patent/AU4932893A/en not_active Abandoned
- 1993-09-01 WO PCT/AT1993/000135 patent/WO1994005482A1/de active Application Filing
- 1993-09-01 DE DE4394174T patent/DE4394174D2/de not_active Expired - Fee Related
Patent Citations (2)
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DE1211379B (de) * | 1958-08-27 | 1966-02-24 | Du Pont Canada | Verfahren und Vorrichtung zum Herstellen von Blasfolien aus thermoplastischen Kunststoffen |
DE2523975A1 (de) * | 1975-05-30 | 1976-12-16 | Veba Chemie Ag | Vorrichtung zur herstellung spannungsarmer rohre aus thermoplastischem kunststoff |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL9400937A (nl) * | 1994-06-09 | 1996-01-02 | Tech Ind W J Van Der Sar B V | Werkwijze en inrichting voor het vervaardigen van een naadloos doorzichtig kokerprofiel. |
WO1996023644A1 (en) * | 1995-02-01 | 1996-08-08 | Wavin B.V. | Method for producing a thermoplastic tubular profile and internal cooling unit for such a method |
NL9500182A (nl) * | 1995-02-01 | 1996-09-02 | Wavin Bv | Werkwijze voor het produceren van een thermoplastisch buisprofiel en binnenkoelorgaan voor een dergelijke werkwijze. |
AU694609B2 (en) * | 1995-02-01 | 1998-07-23 | Wavin B.V. | Method for producing a thermoplastic tubular profile and internal cooling unit for such a method |
US5911933A (en) * | 1995-02-01 | 1999-06-15 | Wavin B.V. | Method for producing a thermoplastic tubular profile and internal cooling unit for such a method |
EP0788869A1 (de) * | 1996-02-06 | 1997-08-13 | Hoechst Aktiengesellschaft | Verfahren zum Herstellen von dickwandigen Rohren aus Polyethylen |
US6019934A (en) * | 1996-02-06 | 2000-02-01 | Hoechst Aktiengesellschaft | Hollow extrusion using internal coolant |
DE29809587U1 (de) * | 1997-03-12 | 1998-11-26 | Lupke Manfred Arno Alfred | Vorrichtung zum Formen von Kunststoffteilen |
AT412771B (de) * | 1997-06-26 | 2005-07-25 | Greiner & Soehne C A | Extrusionswerkzeug für eine kunststoffschmelze |
WO2000013877A1 (de) * | 1998-09-09 | 2000-03-16 | HÄFNER, Gerhard | Vorrichtung zur herstellung von rohren |
AT412767B (de) * | 2000-03-03 | 2005-07-25 | Greiner Extrusionstechnik Gmbh | Verfahren zum herstellen von länglichen gegenständen sowie mit diesem verfahren hergestellter gegenstand |
WO2004022309A1 (en) * | 2002-09-09 | 2004-03-18 | Lupke Manfred Arno Alfred | Pipe mold apparatus with contact and contactless air cooling of plastic in a mold tunnel |
US7632086B2 (en) * | 2003-10-03 | 2009-12-15 | Exxonmobil Chemical Patents Inc. | Melt fracture reduction |
WO2006134228A1 (en) * | 2005-06-15 | 2006-12-21 | Oy Kwh Pipe Ab | Method and device for internal cooling of extruded thermoplastics pipes |
US8062013B2 (en) | 2005-06-15 | 2011-11-22 | Oy Kwh Pipe Ab | Device for internal cooling of extruded thermoplastics pipes |
DE102018113663A1 (de) * | 2018-06-08 | 2019-12-12 | Volkswagen Aktiengesellschaft | Verfahren zur In-Prozessmessung von Prozessparametern und Bauteileigenschaften bei der Herstellung von Hohlprofilen sowie eine Messvorrichtung hierfür |
IT201900018920A1 (it) * | 2019-10-15 | 2021-04-15 | Tecno System Srl | Dispositivo per estrusione di materie plastiche con raffreddamento ad azoto e metodo di estrusione |
WO2021073865A1 (de) * | 2019-10-15 | 2021-04-22 | Unicor Gmbh | Vorrichtung und verfahren zur herstellung von kunststoffrohren unter einsatz eines kühldorns mit sensoreinrichtung |
Also Published As
Publication number | Publication date |
---|---|
AU4932893A (en) | 1994-03-29 |
ATA174592A (de) | 2002-01-15 |
AT409474B (de) | 2002-08-26 |
DE4394174D2 (de) | 1997-03-13 |
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