EP4594075A1 - VERFAHREN UND SPRITZGIEßVORRICHTUNG ZUM SPRITZGIEßEN VON KUNSTSTOFFTEILEN - Google Patents
VERFAHREN UND SPRITZGIEßVORRICHTUNG ZUM SPRITZGIEßEN VON KUNSTSTOFFTEILENInfo
- Publication number
- EP4594075A1 EP4594075A1 EP23782491.7A EP23782491A EP4594075A1 EP 4594075 A1 EP4594075 A1 EP 4594075A1 EP 23782491 A EP23782491 A EP 23782491A EP 4594075 A1 EP4594075 A1 EP 4594075A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection molding
- core
- inductive heating
- plastic
- mold cavity
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—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
- B29C45/26—Moulds
- B29C45/36—Moulds having means for locating or centering cores
-
- 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
- B29C2045/7343—Heating or cooling of the mould heating or cooling different mould parts at different temperatures
-
- 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
- B29C45/03—Injection moulding apparatus
- B29C45/04—Injection moulding apparatus using movable moulds or mould halves
- B29C45/0408—Injection moulding apparatus using movable moulds or mould halves involving at least a linear movement
- B29C45/0416—Injection moulding apparatus using movable moulds or mould halves involving at least a linear movement co-operating with fixed mould halves
-
- 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
- B29C45/03—Injection moulding apparatus
- B29C45/04—Injection moulding apparatus using movable moulds or mould halves
- B29C45/0441—Injection moulding apparatus using movable moulds or mould halves involving a rotational movement
- B29C45/045—Injection moulding apparatus using movable moulds or mould halves involving a rotational movement mounted on the circumference of a rotating support having a rotating axis perpendicular to the mould opening, closing or clamping direction
-
- 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
- B29C45/03—Injection moulding apparatus
- B29C45/04—Injection moulding apparatus using movable moulds or mould halves
- B29C45/06—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction
- B29C45/062—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction carrying mould halves co-operating with fixed mould halves
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating 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
- 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
- B29C45/2673—Moulds with exchangeable mould parts, e.g. cassette moulds
- B29C45/2675—Mounting of exchangeable mould inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/774—Springs
- B29L2031/7742—Springs helical springs
Definitions
- the invention relates to a method and an injection molding device for injection molding plastic parts, in particular medical products.
- liquefied plastic material is injected into a mold cavity of an injection molding tool equipped with a core.
- the object of the invention is to provide a method and an injection molding device for injection molding of injection-molded plastic parts, which are particularly suitable for the production of plastic parts with a relatively large ratio of surface to material volume.
- a method for injection molding plastic parts in particular medical products, is proposed, in which part liquefied plastic material is injected into a mold cavity of an injection molding tool equipped with a core to produce a plastic.
- the method is characterized in that the core is inductively heated before the plastic material is injected.
- the invention is based on the knowledge that, due to the cores in the production of plastic, there are parts in the Have a comparatively large surface area in relation to their material volume, which can lead to difficulties during injection molding. These difficulties are caused by the fact that the cores remove heat from the plastic material injected into the mold cavity to produce the plastic parts, which can affect the quality of the plastic parts produced by injection molding. It is particularly problematic if the cores have a particularly large material volume in relation to the volume of the mold cavity, which is filled with the plastic material to produce the plastic parts. The cores can then act like heat sinks, removing heat from the injected plastic material comparatively quickly.
- the inductive heating of the core before the plastic material is injected makes it possible to reduce or even completely avoid heat extraction caused by the core from the plastic material injected into the mold cavity during the manufacture of the plastic part.
- the inductive heating of the core has the particular advantage that it can be carried out particularly quickly, energy-efficiently and thus economically for the manufacturing process.
- the core in particular at least one shaping surface of the core, is heated to a temperature between 50°C and 100°C, in particular to a temperature between 60°C and 80°C. Heating the core, in particular at least its shaping surface, to such a temperature can promote a particularly efficient implementation of the method and the production of plastic parts in the desired quality.
- At least one shaping surface of the core is heated. This ensures that at least the shaping surface of the core, which comes into contact with the melted plastic material, is heated before the plastic material is injected. The injected plastic material then hits the inductively heated surface of the core within the mold cavity. This prevents heat from being removed too quickly from the plastic material through the core.
- the core is inductively heated within the injection mold, in particular within the mold cavity, preferably with the injection mold open.
- the core is inductively heated outside the injection molding tool and thus outside the mold cavity and is then inserted into the mold cavity of the injection molding tool.
- the core is first inductively heated outside the injection mold and, after inductive heating, is inserted into the injection mold and its mold cavity.
- the injection mold and thus the mold cavity can then be closed.
- the inductive heating of a core can take place outside the injection mold, while another, already inductively heated core can be arranged inside the mold cavity to carry out the method.
- the injection molding tool can therefore be independent of the inductive Heating of a core can be used to produce plastic parts. In this way, dead times in which the injection molding tool and its at least one mold cavity cannot be used to produce plastic parts can be reduced or even completely avoided.
- the core can be heated with an inductive heating coil of an inductive heating device.
- the core can be arranged inside the inductive heating coil for inductive heating.
- the use of an inductive heating coil enables external and therefore superficial heating of the core. This can, as will be explained in more detail below, promote comparatively rapid cooling of the plastic parts on the core.
- the inductive heating coil has a receiving space for the core with an inner contour adapted to an outer contour of the core, preferably a shaping surface of the core, and/or at least inductively heats the shaping surface of the core.
- the inner contour of the receiving space of the heating coil can correspond to the outer contour of the core, in particular its shaping surface. In this way, a uniform heating of the surface of the core, which at least partially delimits the mold cavity, is possible when the core is inserted into the mold cavity.
- the core can be heated superficially by inductive heating.
- the core can preferably be made of a They can consist of solid material and/or be at least essentially void-free. It is therefore possible that during the inductive heating of the core, in particular of at least one shaping surface of the core, a temperature gradient can be established between the heated surface of the core and a less or not heated inner region of the core. Because the surface, in particular the shaping surface of the core, is heated, premature heat extraction from the plastic material injected into the mold cavity can be avoided.
- the core is not heated through, but preferably essentially only its shaping surface is heated, this has advantages when subsequently cooling the injection-molded plastic parts. Due to the aforementioned temperature gradient, the material of the core in the interior region of the core can absorb the heat of the injection-molded plastic part from the plastic material and dissipate it from the plastic part. Despite the inductive heating of the core, this enables rapid cooling of the injection-molded plastic part of the core and thus also the shortest possible cycle times when carrying out the process.
- the inductive heating of the core can be monitored using a temperature sensor. It is also possible to regulate the inductive heating of the core with a control unit. The inductive heating of the core can be regulated by the control unit depending on a temperature of the core to be inductively heated, which is determined using the temperature sensor.
- the inductive heating of the core takes place immediately before the plastic material is injected into the mold cavity. This promotes energy efficiency Carrying out the method because the time in which the core can cool before the plastic material is injected is reduced in this way, and the core only has to be heated to a temperature that is only slightly higher than the temperature at which the core is when injecting the plastic material into the mold cavity.
- At least one insert part for example a pin, a medical piercing device and/or an RFID chip, is inserted into the mold cavity and at least partially overmolded with the plastic material.
- the method can be carried out particularly efficiently if the at least one insert part is arranged on the core and/or is inserted into the mold cavity with the core.
- the core can thus be used not only as a shaping part of the injection molding tool, but also as a holder and/or transport means for the at least one insert part.
- the insert has an electrical and/or electronic function, for example because it is designed as an RFID chip, it may be advantageous to equip the core with the insert only after inductive heating. This prevents damage and/or functional impairment of the insert due to the inductive heating of the core. If the insert is not affected by the inductive heating, the core can also be equipped with the insert before the inductive heating.
- the plastic part After its production, the plastic part can initially remain on the core and be held by it. It is also possible to remove the plastic part together with the core from the mold cavity and/or the injection molding tool leave on the core to cool.
- the core and the heating coil can be arranged relative to one another at a distance of 1-5 mm, in particular 0.5-2 mm, particularly preferably 0.2-1 mm, for inductive heating of the core. This can be done with a positioning device.
- the positioning device can be set up to move the core into the heating coil and/or to place the heating coil over the core.
- the mold cavity and the core are designed in such a way that a plastic part in the form of a plastic spring is produced as part of the method.
- the core can also be used as a transport means for removing the plastic part from the mold cavity of the injection molding tool and/or from the injection molding tool. It is also possible for the plastic part to remain on the core after injection molding and cool down there.
- a plastic spring in particular a coiled plastic spring, can be produced as a plastic part.
- the plastic spring can, for example, have a ratio of turning length to turning width between 20 to 1 and 100 to 1, in particular 50 to 1, and/or, for example, a ratio of turning thickness measurable transversely to the longitudinal axis of the plastic spring to the turning thickness in the direction of the longitudinal axis of the plastic f spring measurable turning width between 1 to 2 and 1 to 10, in particular from 1 to 5.
- an injection molding device for injection molding plastic parts in particular medical products, which has the means and features of the independent claim directed to such an injection molding device.
- a Injection molding device which is designed for injection molding plastic parts, wherein the injection molding device has at least one injection molding tool with at least one mold cavity, at least one core which is arranged in the mold cavity for injection molding a plastic part, and an inductive heating device which is designed for inductively heating the at least one core, in particular at least one shaping surface of the at least one core, before injection molding the plastic part.
- the inductive heating device of the injection molding device can in particular be set up to heat the at least one core, in particular at least one shaping surface of the at least one core, to a temperature between 50 ° C and 100 ° C, preferably to a temperature between 60 ° C and 80 ° C, to heat.
- the inductive heating of the at least one core, in particular at least its shaping surface, to a temperature from these temperature ranges can be particularly advantageous in order to produce plastic parts of the desired quality.
- the injection molding device can be set up to carry out the method already explained above and thus to carry out the method according to one of the claims directed to such a method.
- the injection molding device can have a control unit and/or at least one temperature sensor.
- the control unit can be set up to regulate the inductive heating device depending on a temperature of the core to be inductively heated, determined with the at least one temperature sensor.
- the inductive heating device may comprise at least one inductive Have a heating coil, by means of which the inductive heating device is set up for inductive heating of the at least one core, in particular at least its shaping surface.
- the heating coil can have a receiving space for receiving a core to be heated. Particularly efficient inductive heating is promoted if the shape or inner contour of the receiving space is adapted to the shape or outer contour of the core to be heated.
- the inductive heating device has a number of inductive heating coils that corresponds to the number of mold cavities of the injection molding tool. In this way, all mold cavities can be equipped with an inductively heated core at the same time.
- the injection molding device comprises several groups of cores, each group of cores having a number of cores that corresponds to the number of mold cavities in the injection mold. In this way, it is possible to inductively heat a group of cores outside the mold cavities, while another group of cores is arranged in the mold cavities for injection molding plastic parts.
- a further group of cores, with plastic parts attached to them, can remain in a position outside the injection mold and its mold cavities to cool the plastic parts.
- a further group of cores can be arranged in a loading position, for example for loading inserts.
- the at least one mold cavity and the core assigned to the mold cavity are designed in such a way that when the Mold cavity with plastic material, a plastic part is produced in the form of a plastic spring, in particular a coiled plastic spring.
- the plastic spring can, for example, have a ratio of turning length to turning width of between 20 to 1 and 100 to 1, for example a ratio of 50 to 1, and / or a ratio of turning thickness measurable transversely to the longitudinal axis of the plastic spring to the turning thickness in the direction of the longitudinal axis of the plastic spring measurable turning width between 1 to 2 and 1 to 10, in particular from 1 to 5.
- the injection molding device in particular its inductive heating device, can have a positioning device. With the positioning device it is possible to bring the at least one heating coil into a heating position on the at least one core or the at least one core into a heating position on the at least one heating coil.
- the at least one inductive heating coil and the at least one core can be arranged in the heating position during inductive heating of the core at a distance of 1-5 mm, preferably 0.5-2 mm and particularly preferably 0.2-1 mm from one another. In this way, energy-efficient and fastest possible inductive heating of the core, in particular its shaping surface, is promoted.
- the inductive heating device can be designed for inductive heating of the at least one core inside and/or outside the injection molding tool, in particular the mold cavity.
- the injection molding device can have a transport device.
- the transport device can be designed, for example, as a rotary indexing table.
- the transport device can be set up to remove the at least one core a heating position into the injection molding tool and in particular into the mold cavity.
- the core can be transported with the transport device from a heating position located outside the mold cavity on the inductive heating device into the injection molding tool and preferably thus into the mold cavity.
- the transport direction can also be set up to transport the at least one core, in particular with a plastic part arranged thereon, from the mold cavity into a removal position outside the mold cavity. In the removal position, the plastic part can then first cool down on the core and then be removed from the core.
- the core functions not only as a shaping part of the injection molding tool, but also as a means of transport with which the injection-molded plastic parts can be removed from the mold cavity of the injection molding tool.
- the injection molding device can have a removal device with which a plastic part can be removed from the at least one core, in particular after cooling.
- the removal device can have at least one removal gripper. It is advantageous if the removal device has a number of removal grips that corresponds to the number of mold cavities in the injection molding tool. In this way, it is possible to remove all plastic parts produced in an injection molding step in one removal process.
- the injection molding device can have an insertion device with which insert parts can be arranged on the at least one core.
- the insertion device can have at least one insertion gripper.
- the injection molding device can include an injection molding machine with which plastic material can be injected into the at least one mold cavity of the injection molding tool of the injection molding device.
- the control unit can be set up to control functional units of the injection molding device, in particular to control the injection molding tool, in particular its opening and closing movement, and/or the inductive heating device and/or the positioning device for moving the at least one inductive heating coil between a starting position and a heating position and/or the transport device and/or the removal device with its removal gripper and/or the loading device with its loading gripper and/or the injection molding machine.
- the aforementioned control unit of the injection molding device can have a data interface with which the control unit can be connected at least temporarily to a data storage device, for example to a cloud-based data storage device.
- a computer program can be stored in the data memory, which includes commands that cause the injection molding device according to the invention to carry out the steps of the method according to the invention.
- a computer program which includes commands which cause the claimed injection molding device to carry out the steps of the claimed method.
- the computer program can be executed, for example, on the previously mentioned control unit of the injection molding device.
- the control unit can convert the commands of the computer program into control commands in order to control the previously mentioned functional units of the injection molding device which are used to carry out the steps of the method.
- the control unit can act as a control computer which is set up to execute the computer program.
- Figure 3 shows the injection molding device shown in Figures 1 and 2 with the injection molding tool opened, whereby four injection molded plastic parts in the form of plastic springs can be seen on the four cores arranged on the injection molding tool,
- Figure 4 is an exploded overview with a core, a plastic part, an insert part which is at least partially overmolded with plastic material during the manufacture of the plastic part, as well as a nozzle-side mold half and an ejector-side mold half of the injection molding tool of the injection molding device shown in Figures 1-3,
- FIGS. 1-3 shows a partially sectioned representation of a core equipped with an insert in its heating position within an inductive heating coil of the inductive heating device shown in FIGS. 1-3,
- Figure 6 is a sectional view of the plastic part shown in Figure 4.
- FIG. 7 is a perspective view of the plastic part shown in FIG. 6 with a partially molded insert at its tip, the plastic part being a coiled plastic spring.
- Figures 1-3 show an injection molding device, designated as a whole by 1.
- the injection device 1 is designed to produce injection molded plastic parts 2, namely coiled plastic springs, which can be used, for example, as part of a medical injection device or a medical blood collection device.
- the injection molding device 1 has a total of four groups of four cores 5 each, which can be arranged in the mold cavities 4 of the injection mold 3 for injection molding plastic parts 2.
- the injection molding device 1 also has an inductive heating device 6, which is located upstream of the injection molding tool 3 and is set up for inductive heating of the cores 4 before the plastic parts 2 are injection molded.
- the inductive heating device 6 of the injection molding device 1 is set up to heat the cores 5, namely at least their shaping surfaces 23, to a temperature between 50 ° C and 100 ° C, preferably to a temperature between 60 ° C and 80 ° C.
- the injection molding device 1 comprises a control unit 7 and a total of four temperature sensors 8.
- the control unit 7 is designed to regulate the inductive heating device 6 depending on the temperatures of the cores 5 to be heated, which are determined using the temperature sensors 8.
- the inductive heating device 6 has a total of four inductive heating coils 9.
- the inductive heating device 6 is designed to inductively heat four cores 5 of one of the four individual groups of cores 5 at the same time by means of the inductive heating coils 9. When the cores 5 are heated, primarily the shaping surfaces 23 of the cores 5 are heated, with which plastic material comes into contact during the injection molding of the plastic parts 2 in the mold cavities 4.
- the inductive heating device 6 thus has a number of inductive heating coils 9, which corresponds to the number of mold cavities 4 of the injection molding tool 3.
- the mold cavities 4 and the cores 5 associated with the mold cavities 4 are designed such that when the respective mold cavity 4 is filled with plastic material, plastic parts 2 in the form of coiled plastic springs are produced.
- the overview representation from Figure 4 illustrates the shape of the cores 5, their helical shape the plastic parts 2 on gripping shaping surfaces 23, as well as the shape of the mold cavities 4 predetermined by the two mold halves 10 and 11 and also the shape of the plastic parts 2 that can be produced in the injection mold 3.
- the plastic springs which can be produced as plastic parts 2 with the injection molding device 1, can, for example, have a ratio between turning length and turning width B of between 20 to 1 and 100 to 1, for example a ratio of 50 to 1.
- the plastic springs can also, for example, have a ratio of turning thickness D measurable transversely to the longitudinal axis of the plastic springs to turning width B measurable in the direction of the longitudinal axis of the plastic spring between 1 to 2 and 1 to 10, particularly preferably a ratio of approximately 1 to 5.
- the inductive heating device 6 has a positioning device 12.
- the positioning device 12 serves to bring the four inductive heating coils 9 from their starting position shown in Figure 1 into their heating position shown in Figure 2 on the cores 5. In their heating position, the heating coils 9 are placed over the cores 5 to be heated.
- the cores 5 are arranged within the heating coils 9.
- the heating coils 9 have a shape adapted to the shaping surfaces 23 and the outer contour of the cores 5.
- the inductive heating coils 9 and the cores 5 arranged in the heating coils 9 are arranged at a distance of 1-5 mm, preferably 0.5-2 mm, particularly preferably 0.2-1 mm from one another.
- the inductive heating device 6 is for inductive heating the cores 5 are arranged outside the injection mold 3 and outside its mold cavities 4.
- the cores 5 can also be heated in their position within the injection molding tool 3 or within the mold cavities 4 using an appropriately designed heating device 6. This preferably takes place when the injection molding tool 3 is open.
- the injection molding device 1 has a transport device 13.
- the transport device 13 is designed as a rotary indexing table and is set up to transport the four groups of four cores 5 from their heating position on the heating device 6 into the mold cavities 4 of the injection molding tool 2.
- the cores 5 pass from the heating position located outside the injection molding tool 3 and the mold cavities 4 on the inductive heating device 6 into the injection molding tool 3 and ultimately into the mold cavities 4 of the injection molding tool 3.
- the inductive heating device 6 and the injection molding tool 3 are arranged adjacent to one another on the outer circumference of the transport device 13 at an angular distance of 90°. In this way, the cores 5 can be moved directly into the injection mold 3 and its mold cavities 4 after inductive heating.
- Figure 1 shows a group of already heated inductive cores 5 in a position between two mold halves 10 and 11 of the opened injection molding tool 3.
- the injection molding tool 3 is then shown closed and plastic material is injected into the mold cavities 4, which are delimited by the mold halves 10 and 11, to produce the plastic parts 2.
- Figure 3 shows the plastic parts 2 immediately after opening the injection mold 3 .
- the plastic parts 2 can be moved with the aid of the transport device 13 together with the cores 5 from the injection molding tool 3 into a downstream cooling position, which also serves as a removal position for the injection molded parts 2.
- the injection molding device 1 has a removal device 14.
- the removal device 14 comprises a removal gripper 15 with which the plastic parts 2 can be removed from the cores 5 after cooling and can be set down.
- the injection molding device 1 is set up for at least partially encapsulating insert parts 16, for example pins, medical piercing devices and/or RFID chips.
- insert parts 16 are shown in Figures 1-3 and in particular also in Figures 4, 5 and 7.
- inserts 16 are used which have an electronic function, for example RFID chips, it can be advantageous to arrange the inserts 16 on the cores 5 only after the cores 5 have been heated.
- the cores 5 are each set up to hold an insert part 16 to be overmolded.
- the cores 5 each have a receptacle 17 at their top ends in the figures, into which the insert parts 16 can be inserted.
- the injection molding device has an assembly device 18.
- the assembly device 18 has an assembly gripper 19 with which the Inserts 16 can be arranged on the cores 5.
- the injection molding device 1 Adjacent to its injection molding tool 2, the injection molding device 1 has an injection molding machine 20. With the help of the injection molding machine 20, plastic material can be injected into the mold cavities 4 of the injection mold 3 of the injection molding device 1.
- the control unit 7 has a data interface 21 with which it can at least temporarily establish a data connection to a computer-readable medium 22, namely a cloud-based data storage.
- a computer program is stored in the cloud-based data storage, which includes commands that cause the injection molding device 1 to carry out the method for injection molding plastic parts 2 described in detail below.
- control unit 7 controls the functional units of the injection molding device 1, namely the injection molding tool 3, the inductive heating device 6, the positioning device 12 for moving the inductive heating coils 9, the transport device 13, the removal device 14 with the removal gripper 15, the loading device 18 with the loading gripper 19 and also the injection molding machine 20, in order to carry out the process and to produce the plastic parts 2.
- liquefied plastic material is injected into the mold cavities 4 of the injection molding tool 3 equipped with cores 5 in order to produce plastic parts 2.
- the cores 5 are inductively heated, whereby at least their shaping surfaces 23 are heated.
- the cores 5 are inductively heated outside the injection molding tool 3 and its mold cavities 4.
- the cores 5 are inductively heated on the inductive heating device 6 of the injection molding device 1 and thus outside the mold cavities 4 and then inserted directly into the injection molding tool 3 and into the mold cavities 4.
- the injection molding tool 3 is then closed by bringing the ejector-side mold half 11 closer to the nozzle-side mold half 10.
- the cores 5 are heated with the inductive heating coils 9 of the inductive heating device 6. This occurs when the cores 5 are arranged within the heating coils 9.
- the inductive heating coils 9 are placed over the cores 5. If this is done, the inductive heating device 6 is activated in order to heat the cores 5 using the inductive heating coils 9.
- the figures show that the shape of the heating coils 9 is adapted to the shape of the cores 5 to be heated.
- the heating coils 9 have receiving spaces 25 for receiving the cores 5 to be heated, the shape of which is adapted to the shape of the cores 5 to be heated.
- the cores 5 are heated superficially in the area of their respective shaping surface 23.
- the cores 5 consist of a solid material and are at least predominantly formed without voids.
- the inductive heating creates a temperature gradient between the heated, shaping surface 23 of the respective core 5 and a less or not heated inner region 24 of the respective core 5. This temperature gradient promotes rapid cooling of the plastic part 2 sprayed around the core 5.
- the inductive heating device 6 of the injection molding device 1 is set up to heat the cores 5, in particular at least their shaping surfaces 23, to a temperature between 50 ° C and 100 ° C, preferably to a temperature between 60 ° C and 80 ° C .
- the inductive heating of the cores 5 is monitored using the previously mentioned temperature sensors 8.
- the inductive heating of the cores 5 is controlled by the control unit 7 of the injection molding device 1.
- the temperature sensors 8 determine that the desired target temperature of the cores 5 has been reached, for example when at least the shaping surfaces 23 of the cores 5 have reached a temperature between 60°C and 80°C, the inductive heating device 6 can be deactivated using the control unit 7 and the heating of the cores 5 can be stopped.
- the cores 5 Before the cores 5 are inductively heated on the heating device 6, they are equipped with the inserts 16.
- the cores 5 can only be equipped with inserts 16 after inductive heating. Damage to the inserts 16 due to the influence of the inductive heating device 6 can thus be avoided. This procedure is particularly preferable for inserts 16 with electrical or electronic functions.
- the cores 5 serve not only as molding parts, but also as holders for the insert parts 16 and as a transport means for inserting the insert parts 16 into the mold cavities 4 of the injection molding tool 3.
- the insert parts 16 arranged on the cores 5 are then at least partially overmolded with plastic material.
- the cores 5 and the heating coils 9 are arranged relative to one another at a distance of 1-5 mm, in particular 0.5-2 mm and particularly preferably at a distance of 0.2 mm to 1 mm. This is done using the previously mentioned positioning device 12 of the injection molding device 1.
- Figure 5 illustrates the distance between the inductive heating coils 9 and a core 5 in the heating position within the heating coil 9.
- the plastic parts 2, which can be produced using the process on the injection molding device 1, are coiled plastic springs.
- the plastic springs can, for example, have a ratio of turning length and turning width B between 20 to 1 and 100 to 1, in particular 50 to 1.
- the plastic springs can, for example, have a ratio of turning thickness D measurable transversely to the longitudinal axis of the plastic spring to turning width B measurable in the direction of the longitudinal axis of the plastic spring between 1 to 2 and 1 to 10, in particular approximately 1 to 5.
- the cores 5 are also used as a means of transport for removing the plastic parts 2 from the injection molding tool 3. After injection molding, the plastic parts 2 initially remain on the cores 5 and cool down there.
- the cores 5 act as heat sinks, since the inductive heating of the cores 5 primarily leads to an inductive heating of the shaping surface 23 of the cores 5, while an inner region 24 of the cores 5 remains comparatively cold.
- the invention is concerned with improvements in the field of injection molding technology.
- a method for injection molding plastic parts 2 is proposed, in which liquefied plastic material is injected into a mold cavity 4 of an injection molding tool 3 equipped with a core 5 to produce a plastic part 2.
- the method is characterized in that the core 5 is inductively heated before the plastic material is injected.
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
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022124825 | 2022-09-27 | ||
| DE102022131109.0A DE102022131109A1 (de) | 2022-09-27 | 2022-11-24 | Verfahren und Spritzgießvorrichtung zum Spritzgießen von Kunststoffteilen |
| PCT/EP2023/076749 WO2024068755A1 (de) | 2022-09-27 | 2023-09-27 | VERFAHREN UND SPRITZGIEßVORRICHTUNG ZUM SPRITZGIEßEN VON KUNSTSTOFFTEILEN |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4594075A1 true EP4594075A1 (de) | 2025-08-06 |
Family
ID=88236474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23782491.7A Pending EP4594075A1 (de) | 2022-09-27 | 2023-09-27 | VERFAHREN UND SPRITZGIEßVORRICHTUNG ZUM SPRITZGIEßEN VON KUNSTSTOFFTEILEN |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4594075A1 (de) |
| CN (1) | CN120265449A (de) |
| WO (1) | WO2024068755A1 (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8939438B2 (en) * | 2010-01-08 | 2015-01-27 | Lee Spring Company Llc | Plastic spring and method and apparatus for making the same |
| JP5885612B2 (ja) * | 2012-07-27 | 2016-03-15 | 本田技研工業株式会社 | 射出成形装置及びそれを用いる射出成形方法 |
| KR102129197B1 (ko) * | 2019-01-10 | 2020-07-01 | 서울과학기술대학교 산학협력단 | 가열장치가 삽입된 사출금형 장치 및 이를 이용한 성형방법 |
-
2023
- 2023-09-27 WO PCT/EP2023/076749 patent/WO2024068755A1/de not_active Ceased
- 2023-09-27 EP EP23782491.7A patent/EP4594075A1/de active Pending
- 2023-09-27 CN CN202380081262.2A patent/CN120265449A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN120265449A (zh) | 2025-07-04 |
| WO2024068755A1 (de) | 2024-04-04 |
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