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
  • B29C45/03—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
  • B29C33/00—Moulds or cores; Details thereof or accessories therefor
  • B29C33/0083—Electrical or fluid connection systems therefor
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
  • B29C49/06—Injection blow-moulding
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
  • B29C49/06—Injection blow-moulding
  • B29C49/061—Injection blow-moulding with parison holding means displaceable between injection and blow stations
  • B29C49/062—Injection blow-moulding with parison holding means displaceable between injection and blow stations following an arcuate path, e.g. rotary or oscillating-type
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
  • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
• • 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
  • B29C45/7207—Heating or cooling of the moulded 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/08—Biaxial stretching during blow-moulding

Definitions

• the present invention is in the field of devices for producing hollow plastic products by injection molding and blow molding.
• the tool and the operation of the tool represents a crucial cost point.
• the shortest possible cycle time for increasing the production efficiency is desirable.
• the forming center part rotatable about a rotation axis is generally mounted between two outer mold halves movable along an axis of an injection molding machine, the outer mold halves interacting with side surfaces of the mold center part to form cavities.
• preforms preforming ge
• blow molding takes the appropriate heating of the preforms (preforming ge) before blowing is an important part of a cycle.
• the preforms are in a separate heating station, eg. B. by infrared radiation, heated to the required temperature before the heated preforms are blown in a blowing station in the desired shape.
• a heating station and blow station extends the cycle time and limits the increase in efficiency.
• US Pat. No. 4,427,359 to Sumitomo Heavy Industries, Ltd. shows an injection-blow molding machine with an injection mold and a stretch blow mold comprising four partial molds which form part of the injection mold and can hold the neck of the preforms during transport. They are arranged on a rotating body in 90 ° intervals. The rotary body is rotatable so that the partial molds are successively brought into an injection molding position, a heating position, a blowing position and an unloading position, which are arranged at 90 ° intervals, and moved around a fixed, that is. non-rotatable middle part are arranged.
• DE2444465 of the company L likon Corp. shows an injection molding of a quadrangular turntable, on the outer sides of several mandrels are attached to form a molded article and a multi-layer molding.
• the mandrel can be heated either by circulation of a hot medium in the channels of the mandrel, by high frequency induction heating of the mandrel using an external coil or by dielectric heating using high frequency.
• KG shows an injection blow molding tool with a cast die with several molds and with a relative thereto movable associated male with matching to the plurality of molds mold cores, wherein the male with the mold cores is designed as a rotating body, which is around a Angle of rotation of at least 90 °, in particular 2 x 90 °, mounted on a movable relative to the casting die and between the casting die and a likewise movable Blasmatrize arranged so that simultaneously arranged on one side of the rotating body mandrels in molds of the casting die and on the opposite Side of the rotating body arranged mold cores in blow molds Blasmatrize dive while allowing an injection molding process and a blowing process step. It can be mounted heating coil for electrical heating of the mold core.
• the carrier head is swung back and forth, results in a connection for the various work equipment, because you can do with flexible cables for the work equipment. Slewing rings are not required.
• the blank is formed on the heated blow core and transferred to the heated blow core in the blow chamber.
• preforms are injected onto the cores of a side surface, and by rotating the central part by 180 °, the cores with the injected preforms can be brought into the position of the second outer half of the mold in which they are blown the ejection of the blown parts brings about a reverse rotation of the central part - 1 80 ° the cores back to the starting position for spraying.
• the middle part is therefore between the injection and blowing operations in each case by 1 80 ° and not endlessly pivoted back and forth about a vertical axis.
• the middle part is hanging attached to its holding device and is not in operative connection with the spars of the injection blow molding machine.
• An object of the invention is to show an apparatus for producing hollow plastic products which has a significantly better efficiency and a simpler structure than the devices known from the prior art.
• An embodiment of the molding device according to the invention for producing a product by injection molding, blow molding, injection blow molding or stretch blow molding of plastic comprises at least one mold center part rotatable about a rotation axis, which typically has two or four side surfaces arranged opposite one another with respect to the rotation axis, on which inner mold halves are arranged.
• the perforated part with the inner mold halves is generally arranged between two outer mold halves, which can cooperate in a closed position with the inner mold halves to form cavities, wherein the outer mold halves are preferably movable linearly along an axis of the mold device.
• At least one first connector element arranged co-rotating with the mold center part is provided per inner mold half, which is arranged so that it can be locked in a closed position of the molding device with at least one second connector element not rotating with the mold center part.
• B. cooperates for power supply and / or data transmission, or is operatively connected thereto.
• the at least one second connector element may, for. B. on a holding device of the rotatable mold center part and / or one of the outer mold halves and / or a platen and / or a machine bed.
• the connector elements to be connected may be arranged so that they are operatively connected to each other by the closing movement of the molding device.
• a device can be provided, by means of which the Wirkverbinden detached from the movement of the mold center part, or the mold halves takes place.
• a drive can be slidably arranged for operatively connecting a first connector element relative to a second connector element in an operative connection direction by means of a drive. Good results can be achieved with a linear drive.
• the drive can be arranged on the rotatable mold center part and / or one of the outer mold halves and / or a mold clamping plate and / or a machine bed and / or a holding device for the rotatable mold center part.
• the first and second connector elements may be used for transmitting comparatively high alternating and / or direct currents, e.g. B. as a power supply for heating or cooling elements or actuators or a combination thereof.
• a power supply for heating or cooling elements or actuators or a combination thereof e.g. B.
• the contacting due to the rotational movement presents a special challenge. Due to the rotational movement, ordinary wiring is often impossible or hinders the rotational movement.
• the mold center part or the components to be contacted can be electrically insulated. This is advantageous because most of the components to be contacted of the rotatable mold center part, such as heating elements or pressure sensors, usually only have to be operated electrically in the closed position of the molding device.
• the connector assembly according to the invention with the first and second connector elements has the advantage that cabling problems due to rotational movements can be avoided.
• known prior art contacts which run over the axis of rotation of the forming center part, must absorb the rotational movements of the forming center part, which can lead to fatigue problems.
• the inventive connector assembly is flexible in that it can be easily integrated into existing molds with rotatable mold middle part, since the wiring and the connector elements can be easily attached to the mold center part or to the outer mold halves without changing the structure of large ,
• the mold center part is endlessly rotatable about a rotation axis.
• the inventive arrangement of the connector elements offers the advantage that for the electrical contacting no restrictions of the rotation angle or the direction of rotation of the mold center part are given, since the power supply is decoupled from the rotational movement of the mold center part. Another advantage is that a selective control is possible because the connector elements can be arranged so that only the currently active areas z. B. be supplied with energy.
• the at least one first connector element is electrically connected to heating elements arranged on the mold center part and / or on the inner mold half.
• Heating elements are particularly important for blow molding processes because the preforms must be heated to a suitable temperature for blowing before the blowing process.
• one or more heating elements arranged on the mold center part Cores are actively connected or integrated into these.
• the cores may have a groove, in which a heating wire is inserted. The heating of the cores can be done in kind by means of resistance heating elements or by means of inductive heating elements, which allow a particularly rapid heating.
• two connector elements can be inductively coupled with each other. This has the advantage that z. B. the heating elements can be supplied with power wirelessly.
• cores and cavities corresponding to the cores are arranged on the inner mold halves and cavities are formed on the outer mold halves.
• the inner mold half comprises blown cores, on or within which the heating elements are arranged.
• preforms adhering to the blown cores can be warmed up over the blown cores before blowing.
• a heating on the Blaskerne is advantageous because the thermal coupling between the Blaskernen and preforms is relatively high and therefore z. Example, compared to a conventional heating station in which the preforms are heated by IR radiation from the outside, a more efficient heating power allows and thus less energy is needed.
• the cycle time can be further shortened, since the preforms can achieve the desired temperature for blow molding within a shorter time.
• Another advantage is that the preforms can be blown directly after heating, without having to move the inner mold halves. Therefore, the need for a separate heating station is eliminated.
• an additional side surface of the rotatable mold telteils which was provided as usual in the prior art for the heating process, are free and used for a further processing step.
• Such use of the additionally freed side surface can, for. B. for the production of multi-component products or to increase the output, as will be explained below.
• Another advantage of heating and blowing on the same side surface is that the preforms do not have to be overheated, which is often the case with conventional blow molding equipment, since the preforms may cool during movement from the heating station to the blowing station.
• the at least one first connector element may be electrically connected to sensors arranged on the mold center part and / or on the inner mold half, preferably pressure and / or temperature sensors.
• the at least one first connector element may be electrically connected to cooling elements arranged on the mold center part and / or on the inner mold half.
• the at least one first and the at least one second connector element are electrical connector elements.
• the connector elements have, if necessary, movably arranged connector pins, or correspondingly designed connector sockets.
• the connector pins and the connector sockets advantageously have, at least in some areas, a tapering cross-section which allows easy insertion.
• the connector pins and the connector jacks compatible therewith are tapered so that they can be easily nested.
• the connector pins and the associated connector sockets can be NEN be arranged relative to each other to a certain extent movable, so that any positioning inaccuracies can be compensated.
• the connector pins and / or the connector sockets z. B. be deflected against the force of a spring.
• one or more centering means can be provided, which serve during the plug-in operation for pre-centering of the connector elements.
• the centering means are advantageously arranged to first engage each other before the connector elements contact each other.
• the switching of the currents which are transmitted by means of the connector elements is usually not by means of the connector elements, but by means of one or more switches.
• the connector elements are advantageously plugged in the de-energized state and only then is the electrical circuit closed by the at least one switch.
• the at least one switch is advantageously mounted on the non-rotatable side.
• the switch can be activated by the form movement.
• the first and the second connector element are displaced relative to one another prior to the energy transmission. This can be done via a separate drive, which is activated for this purpose and brings the first with the second connecting element by a relative movement of the two to each other in operative connection.
• the molding device comprises three outer mold halves and the mold center part four side surfaces with four inner mold halves, wherein a first and a second outer mold half with a first and a second disposed on opposite side surfaces inner mold half for injection molding co-operate and a third outer mold half cooperates with a third inner mold half for blow molding, and the fourth side surface for cooling, or for removing the molded parts molded serves.
• This embodiment is particularly suitable for the production of multicomponent products.
• a first component of the products may be molded by injection molding a first plastic. After opening the molding device, these products can be brought to the position of the fourth side surface with the first component by rotation of the mold center part for cooling.
• Another rotation brings the cooled products with the first component to the position of the second side surface, where by injection molding of a second plastic, a second component of the products can be formed, the second component can serve as a preform for the subsequent blow molding.
• the second component can serve as a preform for the subsequent blow molding.
• the internal core mold cores may be heated to the temperature required for blowing, wherein the heating elements for heating the bubble cores may be powered by contacting the at least one first connector element with the at least one second connector element, as in the blown closed configuration of FIG Forming device, the first and second connector elements can be electrically connected.
• the at least one first and the at least one second connector element may be arranged on centering means, which are arranged on the mold center part or on the inner mold halves and on the outer mold halves.
• the arrangement of the connector elements on the centering means is advantageous in that precise alignment of the inner mold halves and the outer mold halves can be achieved upon closure of the mold apparatus by the centering means and thus at the same time ensure optimum alignment of the connector members for the operative connection thereof.
• the invention relates to a method for producing a product with a molding device according to the present disclosure, characterized in that the molding center part and / or the inner mold half is supplied with power when the molding device is in the closed configuration and the at least one first and the at least one second connector element are operatively connected.
• Fig. 1 shows an embodiment of the molding device in a perspective view obliquely from above in the upper right, the molding device being shown in an open configuration;
• FIG. 2 shows the molding apparatus of FIG. 1 in a view obliquely from above left
• Fig. 3 shows the molding apparatus of FIG. Figure 1 is a perspective view obliquely from the top right, showing the mold apparatus in a closed configuration
• Fig. 4 shows the molding apparatus of FIG. 2 in a view obliquely from above left;
• Fig. 5 shows a holding device with a rotatable mold center part in a perspective illustration
• Fig. 6 detail D according to FIG. 5.
• Figure 1 shows a perspective view of an embodiment of a molding apparatus 1 in an open configuration obliquely from above and to the right.
• the molding apparatus 1 comprises a mold center part 2 rotatable about a rotation axis 9 (z-direction) with four inner mold halves 4a, 4b, 4c, 4d arranged on side surfaces 3a, 3b, 3c, 3d, and a first and a second outer mold halves 5a, 5b, which are along Holmen 1 5 an injection molding machine (not shown in detail) in the direction of an axis x relative to the mold center part 2 movable.
• At the inner mold halves 4a-d outwardly projecting cores 6 are arranged.
• the cores 6 can be used, for example, for injection molding (injection cores) and / or blow molding (blown cores) of parts made of plastic. Other embodiments are possible.
• the mold center part 2 is mounted relative to the bars 1 5, or a machine bed of the injection molding machine by means of a holding device, which is not shown here in detail.
• the outer mold halves 5a, 5b comprise correspondingly formed first and second dies 7a, 7b, which are associated with the cores 6 and cooperate with them in a closed configuration (closed position, see Figures 3 and 4) to form cavities, which are used to shape the parts to be produced serve .
• first connector elements 8 On the inner mold halves 4a-d first connector elements 8 are arranged, which rotate with a rotation of the mold center part 2. Of the first connector elements 8 run electrical lines (not shown) to the cores 6.
• the cores 6 may, for example, comprise heating elements, which are contacted by the electrical lines.
• second connector elements 1 0 are arranged, which are operatively connected to the first connector elements 8 when closing the mold apparatus 1, which here schematically by the dotted lines. 1 8 is indicated schematically.
• the second connector elements 10 move with the outer mold halves 5a, 5b.
• the connector elements 8, 10 are disposed on the inner and outer mold halves 4a-4d, 5a, 5b, respectively. Depending on the design and field of application, these may alternatively or in addition to the side and / or below and / or be arranged within the abutting against each other when closing active connection surfaces. Another possibility is to arrange the second connector elements 8, as in FIGS. 5 and 6, on a holding device for the rotatable mold center part 2.
• the first connector elements 8 are generally operatively connected directly to the second connector elements 10, so that a targeted power supply to the molding center part 2 or a region thereof is ensured.
• the connector elements 8, 1 0 are not simultaneously operatively connected to the closing of the molding apparatus 1, but offset in time.
• the connector elements 8, 1 0 are movably mounted at least on one side and displaceable via a corresponding mechanism.
• the connector elements 8, 1 0 may be arranged so that they already come into active connection before the complete closure of the molding apparatus 1.
• first connector element on at least one side so that it first comes into contact with the associated second connector element upon closure of the molding device and then, for example. B. is deflected against the force of a spring until the molding device 1 has reached its final closed position.
• a second connector element 1 0 can be attached to a holder for the rotatable mold center part 2 and if necessary on its own Moving drive for operatively connecting with the first connector element 8 have.
• the connector elements 8, 1 0 are usually plugged with disconnected power supply, or separated from each other to avoid any sparking.
• the power supply, or the drive, for this purpose has a suitable switching element (both not shown in detail).
• the mold center part 2 or the inner mold halves 4a-4d are generally not supplied with power.
• the illustrated embodiment of the molding apparatus 1 allows an intermittent power supply of the mold center part 2 and the inner mold halves 4a-4d.
• first connector elements 8 are arranged on each side surface 3a-3d of the mold center part 2. Alternatively, only a single first connector element 8 may be arranged on the mold center part 2, which can ensure the power supply of all inner mold halves 4a-4d. In this case, the first connector element 8 would not be rotatable.
• the outer mold halves 5a, 5b further comprise centering means 11, which serve to align the inner mold halves 4a-4d and the outer mold halves 5a, 5b with respect to one another.
• FIG. 3 shows the shaping device 1 from FIG. 1 in a view obliquely from the top right, wherein the molding device 1 is shown in a closed configuration (closed position).
• FIG. 4 shows the same molding apparatus 1 from obliquely upper left.
• the side surfaces 3a and 3c serve, the inner mold halves 4a and 4c and the outer mold halves 5a and 5c for injection molding.
• the side surface 3b, the inner mold halves 4b and the outer mold half 5b can be used for a further molding process as described below.1 8
• such a molding process can be structured as follows: injection molding a first component of the products with a first plastic into the cavities formed by the inner mold half 4a and the outer mold half 5a; Rotation of the mold center part 2 by 90 °, so that the sprayed products of the first component come to rest on the side surface 3d; Cooling the sprayed products of the first component on the side surface 3d; Rotation of the mold center part 2 by 90 °, so that the cooled products of the first component come to rest on the side surface 3c; Molding a second component of the products by injection molding with a second plastic, the second component serving as a preform for subsequent blow molding; Rotation of the mold center part 2 by 90 °, so that the products come to rest on the side surface 3 b; Heating the cores to a temperature suitable for blow molding; Blow molding of the preforms.
• FIG. 5 shows a perspective view of a portion of a holding device 1 9 and held by this form center part 2, which is rotatably mounted about the rotation axis 9 relative to the holding device 1 9.
• the holding device 1 9 comprises in the embodiment shown a base 22, which is mounted on bearing shells 23 on two opposite bars 1 5 of a forming device 1 (see Figures 1 to 4).
• a Base 22 also on guide rails on a machine bed of an injection molding machine (all not shown in detail) to be supported.
• a rotary unit 2 1 is attached, which serves for the rotatable mounting of the mold center part 2 about the axis of rotation 9.
• FIG. 6 shows detail D from FIG. 5 in an enlarged view.
• the rotatably arranged mold center part 2 has a first connector element 8 which rotates with the mold center part 2.
• a second connector element 1 0 is arranged on the holding device 1 9.
• the second connector element 10 is displaceably arranged in the vertical direction (z-direction) by means of a drive 24.
• the drive 24 is a linear drive, which is operatively connected to the base 22 and is pneumatically driven. Other forms of drive are possible.
• the drive 24 is activated and the second connector element 10 is inserted from above into the first connector element 8 and is operatively connected thereto. As can be seen in FIG.
• the first connector element 8 has an active surface 24 and the second connector element 10 has a correspondingly configured counter surface 25, which come into contact with one another during operative connection and align the connector elements with respect to one another transversely to the direction of insertion.
• the active surface 24 and / or the mating surface 25 are seen in the insertion direction designed to taper with advantage. If necessary, at least one of the connector element 8, 1 0 be arranged against the force of a spring deflectable.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=55129358

Family Applications (1)

Country Status (5)

Families Citing this family (7)

Family Cites Families (13)

• 2015
  • 2015-10-29 CH CH01577/15A patent/CH711712A1/de not_active Application Discontinuation
• 2016
  • 2016-10-28 US US15/772,312 patent/US10850437B2/en active Active
  • 2016-10-28 EP EP16788681.1A patent/EP3368260A1/de not_active Withdrawn
  • 2016-10-28 CN CN201680069369.5A patent/CN108698261B/zh active Active
  • 2016-10-28 WO PCT/EP2016/076053 patent/WO2017072287A1/de active Application Filing

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