Plastics injection moulding tool and fitting tool for fitting a mould cavity part into and / or removing the mould cavity part from a mould plate of a plastics injection moulding tool

Abstract

The invention relates to a plastics injection moulding tool (1) comprising a tool plate (4) and a mould plate (16), wherein: starting from the tool plate (4), an injection runner (7) via which plastic is injected into a mould cavity part (2) in a flow direction (u) opens into the mould plate (16); the mould plate (16) has multiple mould cavity parts each with an injection runner, and a mould cavity part is held on the mould plate; furthermore, the mould cavity part has been inserted into the mould plate (16), which has a thickness (b) as viewed in the flow direction (u), from a front side (25) of the mould plate counter to the flow direction (u) of the plastic, and, in a resulting inserted position, a contact surface (20) of the mould cavity part rests against a counterpart contact surface (29) of the mould plate (6). In order to specify a plastics injection moulding tool which allows favourable fitting and / or removal of the mould cavity part combined with an advantageous design, according to the invention the mould cavity part (2) is formed in one piece, the mould cavity part (2) as viewed in the flow direction (u) has an extent (a) substantially corresponding to the thickness (b) of the mould plate (16), and the counterpart contact surface (29) is recessed in the mould plate (16) with respect to a surface (34), the rest of which surrounds and adjoins the mould cavity part (2), of the mould plate front face (25). The invention further relates to a fitting tool for fitting or removing a mould cavity part.

Description

Description Plastic injection mold and assembly tool for mounting and / or dismounting a mold cavity part into or from a mold plate of a plastic injection mold. field of technology

[0001] The invention relates to a plastic injection mold, comprising a tool plate and a mold plate, wherein a injection channel opens from the tool plate into the mold plate, through which plastic is injected in a flow direction into a mold cavity part, wherein the mold plate has several mold cavities, each with an injection channel, and a mold cavity part is held on the mold plate, wherein, in addition, the mold cavity part is inserted from a front side of the mold plate against the flow direction of the plastic into the mold plate, which has a thickness considered in the flow direction, and in an insertion position thus given, rests with a contact surface against a counter contact surface of the mold plate.

[0002] The invention further relates to an assembly tool for mounting and / or dismounting a mold cavity part into or from a mold plate of a plastic injection mold, wherein the mold cavity part has two or more screw openings by means of which the mold cavity part can be fastened to the mold plate with fastening screws. State of the art

[0003] Plastic injection molds of the type in question are known, for example from EP 3424 676 B1 (US 11,225,002 B2). This plastic injection mold has a mold cavity flange and a mold cavity insert. Together, these separate parts form the mold cavity on the mold plate side. For the assembly or disassembly of the mold cavity flange and the Further assembly tools for the mold cavity insert are described in this publication. A first assembly tool is provided for the mold cavity flange, and a second disassembly tool, designed differently from the first assembly tool, is provided specifically for disassembling the mold cavity insert. Both tools are connected to the mold cavity flange and the mold cavity insert, respectively, via several screw bolts to facilitate disassembly. Summary of the invention

[0004] Based on the aforementioned prior art, the invention addresses the problem of providing a plastic injection mold with a mold cavity that is advantageously designed and preferably also enables convenient assembly and / or disassembly of the mold cavity. Furthermore, the invention addresses the problem of designing an assembly tool for assembling and / or disassembling the mold cavity.

[0005] This problem is solved with regard to the plastic injection mold in the subject matter of claim 1, wherein the focus is on the fact that the mold cavity part is formed in one piece, that the mold cavity part, viewed in the flow direction, has an extent which essentially corresponds to the thickness of the mold plate, and that the counter-contact surface in the mold plate is recessed relative to a surface of the mold plate front that otherwise surrounds the mold cavity part.

[0006] Due in particular to the one-piece design, and preferably a one-piece and material-seamless design, of the mold cavity part, easy handling of the mold cavity part into and out of the mold plate is made possible. Assembly can be carried out from the front of the mold plate in a single step. The [missing information] for the All parts required for the mounting are accessible and controllable from the front of the mold plate.

[0007] The mold cavity preferably extends from the front of the mold plate, completely penetrating the mold plate across its entire thickness, to a rear side of the mold plate opposite the front. In this way, the mold cavity can, in addition to forming a complete, one-piece first mold part, preferably also create a receiving area for the associated injection channel.

[0008] The counter-contact surface is recessed relative to the front of the mold plate, resulting in a recessed or even countersunk arrangement of the section of the mold cavity containing the contact surface within the mold plate. The contact surface can be formed in a flange of the mold cavity, which, due to the offset arrangement of the counter-contact surface, can be fully or partially recessed relative to the front of the mold plate in the mold cavity's installed position.

[0009] With regard to the assembly tool for assembly and / or disassembly, the problem can be solved by the assembly tool having two or more mounting pins with a longitudinal axis which fit into screw openings of the mold cavity part when the fastening screws are removed, and by the mounting pins having a projection which can be moved transversely with respect to their longitudinal axis, in order to engage behind a counter surface of the mold cavity part.

[0010] To anchor the assembly tool to the mold cavity part being assembled or disassembled, the assembly tool assumes a rearward gripping position between the projection and the mating surface. This can be a locking mechanism that can be deliberately engaged by the user consciously applying force to the assembly tool. The same openings in the mold cavity part are used for screwing the mold cavity part to the mold plate.

[0011] The mounting pin can have a circular cross-section viewed perpendicular to its longitudinal axis. Its diameter can essentially correspond to the screw diameter used to fasten the mold cavity part.

[0012] According to one possible embodiment, the mold cavity can have four screw openings into which four mounting pins of the assembly tool are inserted for mounting and / or dismounting the mold cavity. Preferably, several, and more preferably, each mounting pin has at least one movable projection for interlocking with a mating surface.

[0013] The proposed design simplifies both the removal and installation of a mold cavity part from the mold plate, making it easier to handle. Instead of laboriously screwing numerous mounting screws into the mold cavity part, the proposed assembly tool, with its mounting pin, is simply inserted into the existing screw holes of the mold cavity part to engage the rear grip position, preferably in the form of a locking mechanism. The mold cavity part can then be removed immediately. The mold plate can be removed. The mold cavity part can be assembled in the same way using the assembly tool.

[0014] The mold plate of the plastic injection mold can also have one or more cooling channels, which, relative to the mold plate thickness, can be arranged particularly close to the mold cavity and at a distance from the front, running approximately parallel to the front. During the injection molding process, heat is dissipated from the area of ​​the mold cavity via such a cooling channel using a liquid medium, especially water.

[0015] In a further preferred embodiment, the injection channel is a hot runner through which the plastic material can be supplied to the cavity formed by two molded parts (a first molded part formed by the mold cavity part, and a second molded part formed by a counter-mold part that can be supplied to the mold cavity part).

[0016] When the mold cavity is inserted into the mold plate, an insertion direction of the mold cavity is established. Viewed in this insertion direction, a longitudinal axis of the mold cavity continues, in which, for example in the first mold part, a partial contour of the object to be injection-molded may be formed.

[0017] The mold cavity can also form a cylindrical section that extends from the front of the mold plate to below the cooling channel(s). This cylindrical section can extend concentrically to the longitudinal axis and, facing the front of the mold plate, terminate in a... The flange extends over the contact surface. To form the contact surface, the flange can project completely or only partially over the circumference of the cylinder section when viewed transversely to the longitudinal axis.

[0018] Starting from the front, the cylindrical section can extend beyond the area of ​​the cooling channels and, if necessary, terminate at a distance from the rear of the mold plate facing away from the front, with respect to the cylindrical section alone. A preferred embodiment is one in which the cylindrical section essentially terminates at the plane of the rear of the mold plate, but more preferably does not extend beyond this plane.

[0019] Viewed from the front of the mold plate, a tuning plate can, in a further possible embodiment, be arranged below the mold plate. This tuning plate can extend with essentially the same thickness between the mold plate and the tool plate – which, for example, essentially forms a hot runner assembly. Accordingly, parallel, flat surfaces can be formed between the tuning plate and the mold plate, as well as between the tuning plate and the tool plate.

[0020] Preferably, the outer contour of the tuning plate corresponds essentially to the outer contour of the tool plate and / or the mold plate in the area of ​​the respective adjacent surfaces.

[0021] The alignment plate can, according to one possible design, provide a support surface for the cylindrical section of the mold cavity. Given the high pressure prevailing within the formed cavity during the injection molding process, this can, in addition to providing secure support for the mold cavity via its contact surface against the opposing contact surface of the mold plate, potentially also... Alternatively, or instead of – although preferably only partially – support can be achieved via the cylinder section on the facing support surface, for example, of the tuning plate.

[0022] In a further embodiment, depending on the size of the injection mold, a multiple of adjustment plates can also be provided. For example, for an injection-molded part with 32 cavities or mold sections, only one adjustment plate may be sufficient, whereas for injection molds with 96 or 128 cavities or mold sections, several, for example four or more, adjustment plates may be preferably provided.

[0023] In further developments, the bearing surface for the cylinder section can also be achieved—possibly omitting the adjustment plate—by a correspondingly thicker mold plate in this area, or possibly by a greater overall thickness of the mold plate, or by the adjacent contact surface of the tool plate. The greater thickness is then used to form a contact surface for the cylinder section in the mold plate, for example, one that projects inwards in a stepped manner. Alternatively, the bearing surface for the cylinder section can be formed partly by the contact surface of the tool plate and partly by a correspondingly shaped section of the mold plate.

[0024] The assembly tool may, in one possible design, include a retaining plate which may be penetrated by one or more mounting pins. The mounting pins may find support in the retaining plate.

[0025] The mounting pins can be actuated by one or more brackets, which are attached to the mounting plate. A mounting pin can be supported between a section of a bracket and a region of the mounting plate facing the bracket, with a section of the mounting pin extending beyond the support region on the mounting plate penetrating the mounting plate in the direction of its longitudinal axis and projecting freely beyond the mounting plate surface facing away from the bracket.

[0026] The mounting pin can have a tubular pin body, inside which an actuating mandrel is accommodated. The mounting pin preferably bears against the mounting plate with its pin body. The actuating mandrel can be displaceable along the longitudinal axis relative to the pin body. An end of the actuating mandrel projecting freely beyond an end of the pin body can be supported by an associated bracket.

[0027] The bracket is movable relative to the mounting plate to move the actuating mandrel, particularly in the direction of the longitudinal axis of the mounting pin. If multiple brackets are provided for multiple mounting pins, these brackets are preferably coupled to one another in such a way that essentially a uniform, simultaneous sliding displacement of all actuating mandrels in their associated pin bodies is achieved.

[0028] Each actuating pin is preferably designed to engage the associated projection. In one possible displacement position of the actuating pin within the pin body, the projection can be forced into a locking position, either directly or indirectly, by the actuating pin. In another possible displacement position, however, the Leave a gap at the front that allows it to move out of the blocking position towards the interior.

[0029] The aforementioned locking position can be an unloaded initial position of the assembly tool, from which the actuating mandrel can be moved against spring force relative to the pin body towards an unlocked position. The spring force can, for example, result from a cylindrical compression spring arranged inside the pin body, which is supported on one side by the cylinder body and on the other side by the actuating mandrel.

[0030] In a further embodiment, the mating surface interacting with the projection can be formed by a radial recess in the screw opening. Such a radial recess can, for example, be provided at the end of the screw opening of the mold cavity part when viewed in the insertion direction of a mounting pin into the screw opening. It can also be a radial recess that is either complete or only partially circumferential with respect to the longitudinal axis, providing an entry space for the projection.

[0031] The projection can – if necessary under load via the spring on the pin side – snap into the recess. In the assembly tool's home position, this creates a secure gripping position, in which, for example, the mold cavity part can be removed by pulling it along the longitudinal axis of the mounting pins.

[0032] The release of the locking mechanism between the assembly tool and the mold cavity part is achieved by the aforementioned, intentionally brought about displacement of the actuating mandrels relative to the pin bodies, thus enabling a radial inward deflection for the respective projection.

[0033] The mounting pin can also have two or more transversely movable projections for engaging the mating surface. If two projections are provided, they can be arranged diametrically opposite each other.

[0034] A projection can also be shaped like a sphere, especially a metal sphere.

[0035] In a preferred embodiment, the actuating mandrel is designed to engage both or all of the same mounting pin's projections simultaneously when the mounting pin is designed to have two or more movable projections.

[0036] To enable the same assembly tool to mount or dismount molded parts with different screw hole depths (measured along the longitudinal axis), the tool can have mounting pins that are adjustable in length along the longitudinal axis. This length adjustment allows the free projection beyond the mounting plate surface facing away from the bracket to be adapted to the screw hole depth. For example, the mounting pins can be telescopically designed for this purpose. Alternatively, the mounting pins can have a projection large enough to allow for the dismounting of molded parts with different screw hole depths.

[0037] Furthermore, a handle can be provided that is essentially rigidly connected to one or more brackets. In one possible embodiment, the handle can also be equipped with a striking bolt surrounding the handle, for example, in a cylindrical shape, which can be moved relative to the handle in the direction of the longitudinal axis to deliver a sudden impact to the brackets and, via these, to the mounting pins. Brief description of the drawings

[0038] The invention is explained below with reference to the accompanying drawings, which, however, only represent exemplary embodiments. A component that is explained only in relation to one of the exemplary embodiments and is not replaced by another component in a further exemplary embodiment due to the special feature highlighted therein, is thus also described for this further exemplary embodiment as a component that is at least possible. The drawing shows: Fig. 1 in perspective exploded view of a plastic injection mold with a tool plate having a plurality of injection channels, a tuning plate and a mold plate with a plurality of mold cavities, a counter-mold part and an assembly tool for assembling or disassembling a mold cavity part into or out of the mold plate, relating to a first embodiment; Fig. 2 shows a mold cavity part with an associated assembly tool in a side view according to arrow II in Figure 1; Fig. 3 shows the view according to arrow III in Figure 2; Fig. 4 shows the section along line IV-IV in Figure 3; Fig. 5 shows area V in Figure 4 in a longitudinal section view, relating to a basic position of the assembly tool; Fig. 6 shows a sectional view according to Figure 5, concerning an intermediate position during the insertion process of the assembly tool prepared for insertion into corresponding openings of the mold cavity part to be removed; Fig. 7 is a subsequent representation to Figure 6, relating to the insertion position of the assembly tool, in which a locking of the assembly tool and the mold cavity part is achieved; Fig. 8 shows a sectional view according to Figure 7, concerning an intermediate position during an extraction displacement of the mold cavity part by means of the assembly tool; Fig. 9 shows the mold cavity part, freed from fastening screws and seated in the mold plate, in a longitudinal section and the associated assembly tool in a side view, relating to the basic position according to Figure 5; Fig. 10 shows a representation according to Figure 9, relating to the preparation position of the assembly tool for inserting mounting pins into screw openings of the mold cavity part; Fig. 11 shows a representation according to Figure 10, relating to the insertion position of the assembly tool, in which a locking action is achieved between the assembly pins and the mold cavity part; Fig. 12 shows the assembly tool in a perspective exploded view; Fig. 13 shows the mold cavity in a perspective view, looking at a partial contour of an object to be injected, given by the mold cavity; Fig. 14 shows the mold cavity part in a further perspective view, looking at a cylindrical section facing away from the partial contour; Fig. 15 shows a perspective sectional view through section XV in Figure 1 through the ready-to-use arrangement of the tool plate with its injection channels, the tuning plate and the mold plate provided with the mold cavity parts; Fig. 16 shows area XVI in Figure 15 in a sectional view; Fig. 17 in perspective view of a tuning plate for arrangement in a plastic injection mold, relating to a multi-part embodiment of the tuning plate; Fig. 18 shows a representation essentially corresponding to Figure 13, relating to a further embodiment of a mold cavity part; Fig. 19 shows a representation essentially corresponding to Figure 16, with the mold cavity arranged according to Figure 18. Description of the embodiments

[0039] A plastic injection mold 1 is shown and described, initially with reference to Figure 1, which is only partially shown schematically in the illustrations.

[0040] The plastic tool 1 essentially has two mold parts, a essentially first, stationary mold part, which is further essentially formed by a mold cavity part 2 held in a mold plate 16, and a second mold part that can be fed to the first mold part, which, according to the illustrated embodiment, can be formed by a counter mold part 3 that can be displaced along a geometric traversing axis x.

[0041] Part of the plastic tool 1 is a tool plate 4, which can be part of a hot runner assembly 5. The free end face of the tool plate 4 is perforated by a plurality of injection channels 7 with injection nozzles 8 projecting freely beyond the end face 6. In the illustrated embodiment, four such injection channels 7 are provided.

[0042] In a further preferred embodiment, each injection channel 7 is a hot runner through which the plastic material can be supplied to the cavity formed by the two mold parts (first mold part, formed by the mold cavity part 2, and second mold part, formed by the counter mold part 3).

[0043] Furthermore, a tuning plate 9 can be a further part of the plastic injection mold 1. This preferably takes up essentially the The plan view of the mounting surface 6 of the tool plate 4 shows a counter mounting surface 10 and a support surface 11 facing away from the counter mounting surface 10.

[0044] The thickness d between the counter-contact surface 10 and the support surface 11 is preferably kept constant over the entire extent of the adjustment plate 9, so that the counter-contact surface 10 and the support surface 11 can run essentially parallel to each other. The adjustment plate 9 can also be contour-adapted in the area of ​​its counter-contact surface 10 and its support surface 11 to the contour of the tool plate-side contact surface 6 or the mold plate-side counter-support surface 12, respectively.

[0045] Furthermore, the tuning plate 9 has these bore-like openings 13 penetrating in the direction of its thickness d, through which, in the arrangement position, the injection channels 7 extend beyond the support surface 11.

[0046] The tuning plate 9 can, preferably, be attached to the tool plate 4 or to the hot runner assembly 5 by means of a screw fastening, with a large-area contact surface 10 on the tuning plate side against the facing contact surface 6 of the tool plate 4. For this purpose, the tuning plate 9 can have screw openings 14 extending through its thickness d.

[0047] Furthermore, the tuning plate 9 can be perforated by bores 15 through which screws can be inserted to fasten the form plate 16 to the tool plate 4.

[0048] Figure 1 shows an example of a mold plate 16 with four mold cavity parts 2. It can accordingly be a 4-cavity mold plate 16. In this case, and possibly further up to a 32-fold mold plate, the tuning plate 9 can be made in one piece, as shown in Figure 1.

[0049] For larger mold plates 16, for example a 96- or 128-cavity mold plate with correspondingly 96 or 128 mold cavity parts 2, a multi-part tuning plate 9, as shown in Figure 17, can be provided. For example, a four-part tuning plate 9 can be provided, with four tuning sub-plates 72 and 73, preferably having substantially the same widths g.

[0050] With reference to the illustration in Figure 17, the upper and lower tuning sub-plates 72 can be essentially identical in design, as can the middle tuning sub-plates 73 arranged between these outer tuning sub-plates 72, which can be essentially identical in design.

[0051] The mold plate 16 shown in the embodiment according to Figures 1 to 16 is designed to receive four mold cavities 2, corresponding to the number of injection channels 7. A larger number of mold cavities is also possible, for example, 8, 16, 32, etc. These mold cavities 2 can be identical with respect to their optional partial contour 17 of an object to be injection molded. However, mold cavities 2 with different partial contours 17—or even without a defined partial contour, as shown in the embodiment illustrated in Figures 18 and 19—can also be received in the mold plate 16.

[0052] Each mold cavity part 2 is preferably formed in one piece, and optionally also in one piece and made of a single material. The mold cavity part 2 can essentially have a flange projecting radially with respect to a longitudinal axis y. 18 and a cylindrical section 19 extending below the flange 18, preferably projecting radially beyond it.

[0053] The cylinder section 19 can extend concentrically to the longitudinal axis y of the mold cavity part 2.

[0054] Turning away from the cylinder section 19, the mold cavity-side partial contour 17 of the object to be injected can be formed concentrically to the longitudinal axis y according to the first embodiment.

[0055] The flange 18 can project completely or partially over the circumference of the cylinder section 19 to form a contact surface 20 of the mold cavity part 2, viewed transversely to the longitudinal axis y. An embodiment is shown in which the flange 18, viewed in a plane transverse to the longitudinal axis y, has a rectangular, preferably square, plan view with a leg length e that exceeds the outer diameter f of the cylinder section 19. For example, the leg length e can be approximately 1.1 to 1.5 times, or for example approximately 1.2 times, the diameter f.

[0056] The mold cavity part 2 has, in the direction of the longitudinal axis y, in which direction a flow direction u of the injected plastic also results in the usual operating position (compare figure 16), an extent a between a frontal contact surface 21 of the flange 18 and a circumferential end surface 22 of the cylinder section 19.

[0057] Furthermore, the cylinder section 19 has on its inside a recess 23 which runs concentrically to the longitudinal axis and is shaped in a step-like manner in the direction of the longitudinal axis y, in which the associated injection channel 7 with its injection nozzle 8 extends in the operational arrangement position (compare figure 16).

[0058] During the injection process, plastic material from the injection nozzle 8 can enter the area of ​​the formed cavity via an injection opening 37 between the recess 23 and the area of ​​the partial contour 17.

[0059] The injection opening 37 can also be formed directly in the support surface 21, particularly if, as shown in Figures 18 and 19, the partial contour 17, as well as the remaining contour of the object to be injection-molded, is formed essentially completely in the counter-mold part 3. The support surface 21 can then directly close off the cavity formed essentially completely in the counter-mold part 3.

[0060] The contact surface 21, in the area surrounding the injection opening 37 and covering the cavity, can, for example in a cross-section according to Figure 19, have, for example, rib-like projections extending beyond the plane of the contact surface 21 and / or, for example, rib-like depressions extending from the plane of the contact surface 21. Furthermore, for example, a top surface of the object to be injection-molded can be provided with an emblem in the form of an embossed design.

[0061] The counter-form part 3 can, for example, have several, further, for example, four sliding jaw tool parts 74, which together in the We- The sliding jaw tool parts 74, with their wedge-shaped outer surfaces, interact with rail-like guides 75 of the corresponding mold half. Such a counter-mold part 3 is known, for example, from WO 2021 / 170217 Al.

[0062] The mold plate 16 has receptacles 24 for holding the mold cavity parts 2, which extend from a front side 25 of the mold plate 16 facing the counter mold part 3, preferably completely passing through the mold plate 16, to a rear side 26 forming the counter support surface 12.

[0063] Each receptacle 24 preferably consists of a recess 27 adapted to the outer contour of the mold cavity-side flange 18 in the area of ​​the front 25 and a cylindrical recess 28 adjoining it in the direction of the rear 26 and adapted to the diameter dimension f of the cylinder section 19.

[0064] Inserting the mold cavity part 2 from the front 25 into the receptacle 24 of the mold plate 16 results in an insertion direction r of the mold cavity part 2, which essentially runs in the orientation of the longitudinal axis y. The insertion direction r is further essentially opposite to the flow direction u of the plastic to be injected.

[0065] In the insertion position (compare figures 15 and 16), the contact surface 20 of the mold cavity part 2, which faces away from the partial contour 17, preferably lies flat on the facing, stepped counter-contact surface 29 at the foot of the recess 27.

[0066] The depth t of the recess 27, viewed in the axial direction, can be adapted to the thickness s of the flange 18, viewed in the same direction, so that the end-face bearing surface 21 of the mold cavity part 2 - as shown by way of example in Figure 16 - can extend essentially in the plane of the front face 25 of the mold plate.

[0067] The counter-surface 29 in the mold plate 16 can be arranged recessed relative to a surface 34 of the front of the mold plate 25 which otherwise surrounds the mold cavity part 2.

[0068] As further shown, for example, in dashed-dotted line in Figure 16, the thickness s' of the flange 18 can also exceed the depth t of the recess 27, so that when the contact surface 20 rests against the counter contact surface 29, the bearing surface 21 can extend axially above the front face 25.

[0069] The total extent a or a' of the mold cavity part 2 in the flow direction u or in the direction of the longitudinal axis y can thus preferably correspond at least to the thickness b of the mold plate 16 in the area of ​​the receptacle 24, considered in the same direction. In any case, the mold cavity part 2 can completely penetrate the mold plate 16 in the axial direction.

[0070] The mold plate 16 can furthermore have one or more cooling channels 30, which, viewed in the direction of the mold plate thickness b, are preferably arranged at a distance c from the front face 25 and more preferably approximately parallel to the front face 25. Cooling of the mold plate can be achieved in particular via one or more of these cooling channels 30. The mold cavity part 2 can be cooled by means of a liquid medium, in particular water. The mold cavity part 2 can be provided with appropriately positioned channel sections 36 that correspond to the cooling channels 30 in the insertion position.

[0071] Viewed in the direction of the longitudinal axis y, in front of and behind the channel sections 36, the cylinder section 19 can have circumferential seals 70 which, in the insertion position, press against the facing wall of the recess 23 or the cylindrical recess 28 and thus seal the cooling area.

[0072] Furthermore, the cylindrical section 19 of the mold cavity part 2 can extend from the front 25 of the mold plate 16 to below the cooling channels 30, with the cylindrical section 19 extending further from the front 25 beyond the area of ​​the cooling channels 30 and essentially terminating with the plane of the rear 26 of the mold plate 19.

[0073] In the insertion position of the mold cavity part 2 in the mold plate 2, support can also or alternatively - if necessary only partially in addition to the support via the contact surface 20 on the counter contact surface 29 - be provided via the end face 22 of the cylinder section 19 on the support surface 35 of the alignment plate 9 surrounding the associated opening 13 for the injection channel 7 (compare figure 16).

[0074] In the four corner areas, the flange 28 is provided with screw openings 31 through which fastening screws 32 extend to secure the mold cavity part 2 to the mold plate 16. In the secured position, the fastening screws 32 engage with their threads in the opposing contact surface 29. the opening of the recording 24 threaded bores 33 (see detailed illustration in Figure 4).

[0075] The bore axes z of the threaded bores 33 flanking the cylindrical recess 28 extend in the direction of the longitudinal axis y or in the main flow direction u.

[0076] Due in particular to the one-piece design, and preferably a one-piece and material-uniform design, of the mold cavity part 2, easy assembly and disassembly of the mold cavity part 2 into and out of the mold plate 16 is possible. Assembly and disassembly can be carried out solely from the front 25 of the mold plate 16. Similarly, inspection of the assembly – particularly with regard to the fastening screws 32 – is also possible solely from the front 25.

[0077] The mold cavity part 2 can be disassembled after removing the fastening screws 32.

[0078] For disassembly of the mold cavity part 2, as well as for assembly of the mold cavity part 2, an assembly tool 38 is used, as shown in an exploded view in Figure 12.

[0079] In the illustrated embodiment, the assembly tool 38 has four mounting pins 39, each with a longitudinal axis w, adapted to the number of screw openings 31 in the mold cavity part 2. These mounting pins fit into the screw openings 31 when the fastening screws 32 are removed. The mounting pins 39 can be designed, as also shown, in the form of so-called ball lock pins.

[0080] The assembly tool 38, in the embodiment shown, has a retaining plate 40 which is penetrated by the mounting pins 39 in the direction of their longitudinal axes w in the area of ​​provided bores 41. The mounting pins 39 are supported on the retaining plate 40, in particular in a provided radial step 42 in the area of ​​each bore 41.

[0081] The retaining plate 40 may, but does not necessarily, have a plan adapted to the plan area of ​​the mold cavity part 2 in the area of ​​the flange 18. Accordingly, a substantially square plan may result.

[0082] The mounting pins 39 can be acted upon by one or more – in the illustrated embodiment example, two – brackets 43. A mounting pin 39 can thus be supported between a section of a bracket 43 and a region of the retaining plate 40 facing the bracket 43, preferably the radial step 42, wherein a section 44 of the mounting pin 39 extending beyond the support region on the retaining plate 40 penetrates the retaining plate 40 in the direction of the longitudinal axis w and projects freely beyond the retaining plate surface 45 facing away from the bracket 43 (compare Figures 2 and 3).

[0083] Each mounting pin 39 can have a circular cross-section viewed transversely to its longitudinal axis w. The diameter of this cross-section can be essentially adapted to the diameter of a fastening screw 32 for fastening the mold cavity part 2 to the mold plate 16.

[0084] The mounting pin 39 can further comprise a tubular pin body 46, in the interior 69 of which a pressing mandrel 47 is received. The pin body 46 can be supported on the retaining plate 40, in particular on the radial step 42, by means of a radial collar 48.

[0085] The actuating pin 47 can be displaced in the direction of the longitudinal axis w relative to the pin body 46. An end 49 of the actuating pin 47 projecting freely beyond an end of the pin body 46 can be supported by the associated bracket 43. For this purpose, the bracket 43 can have a cup-shaped receptacle 50.

[0086] The bracket 43 is movable relative to the retaining plate 40 for the movement of the actuating mandrel 47, in particular in the direction of the longitudinal axis w of the mounting pin 39. In the case of a plurality of brackets 43 for a plurality of mounting pins 39, as also shown, these brackets 43 are preferably coupled to one another in such a way that a substantially uniform, simultaneous sliding displacement of all actuating mandrels 47 in their associated pin bodies 46 is always effected. This coupling can be achieved by the arrangement of a transverse bracket 51.

[0087] The crossbar 51 is held and simultaneously guided in the direction of the longitudinal axis w by two shoulder screws 52, which pass through the crossbar 51 in the area of ​​bores 53 and the brackets 43 in the area of ​​bores 55 and engage in threads in the retaining plate 40 correspondingly provided threaded bores 54.

[0088] Furthermore, the mounting pins 39 can be configured in two ways with regard to their longitudinal axis w displaceable in the transverse direction and diametrically opposite have projections 56 for engaging behind a counter surface 57 of the mold cavity part 2.

[0089] The projections 56, which are preferably designed as spheres and are in particular metal spheres, are inserted into openings 71 of the pin body 46 and are secured against complete protrusion to the radial outside.

[0090] To anchor the assembly tool 38 to the mold cavity part 2 to be disassembled, the assembly tool 38 assumes a rearward gripping position between the projection 56 and the counter surface 57. This can be a locking mechanism that can be deliberately engaged by the user consciously operating the assembly tool 38. The same openings, namely the screw holes 31, in the mold cavity part 2 are used for this purpose, as are also used for screwing the mold cavity part 2 to the mold plate 16.

[0091] Each actuation pin 47 is preferably designed to engage the associated projection 56. For this purpose, the actuation pin 47 can have a waist-shaped release section 58, to which a locking section 60 with a larger diameter than the release section 58 is connected via a conical section 59.

[0092] In a displacement position, for example according to Figure 5, of the actuating pin 47 in the pin body 46, the projection 56 can be directly forced into a locking position by the actuating pin 47, in particular by the conical section 59 or the subsequent locking section 60. In another possible displacement position, however, the projection 56 is forced into a locking position by the assignment of the reduced-diameter release element. Section 58 leaves an inward clearance that allows the projection 56 to move out of the locking position toward the interior 69 (compare Figure 6).

[0093] The aforementioned locking position can be an unloaded basic position of the assembly tool 38, from which the actuating mandrel 47 can be moved against spring force relative to the pin body 46 in the direction of an unlocked position. The spring force can result from a cylindrical compression spring 61 arranged inside the pin body 46, which is supported on one side by the cylindrical body 46 and on the other side by the actuating mandrel 47.

[0094] The displacement of the actuating pins 47 from the locking position to the release position of the projections 56 can be achieved by grasping the assembly tool 38, for example with the thumb and index finger, whereby the thumb continues to load, for example, one of the brackets 43 or the cross bracket 51 in the direction of the longitudinal axis w, while the index finger - or other fingers - grips a recess 62 in the area of ​​the retaining plate 40 and thus moves the brackets against the retaining plate, which causes a displacement of the actuating pins 47 in the pin bodies 46 against the restoring force of the cylinder compression spring 61 (see arrows p in Figure 10).

[0095] In the unlocked position thus achieved, the assembly tool 38 is applied to the mold cavity part 2 by guiding the assembly pins 39 through the screw openings 31. Upon reaching the counter surface 57, and with the release of the load on the brackets 43 by the user, the projections 56 fall into the rear gripping position with spring assistance (see Figure 11).

[0096] For further handling of the assembly tool 38, a rod-shaped handle 63 is attached to the retaining plate 40, essentially in a central arrangement. For this purpose, a further threaded bore 64 may be provided in the retaining plate 40.

[0097] The rod-shaped handle 63 passes through the crossbar 51 in the area of ​​a bore 65 provided between the bores 53.

[0098] The handle 63, which is formed, for example, in the manner of a cylinder head screw, has a stop 66 in the area of ​​its free end that is radially enlarged compared to the rod-shaped section.

[0099] Furthermore, a barrel-shaped striking bolt 67 can be arranged on the rod-shaped handle 63 so as to be freely displaceable in the direction of the longitudinal axis w, via which, for example, in the case of a stuck mold cavity part 2 with stops against the stop 66 and / or against the crossbar 51, a striking impulse can be exerted on the mold cavity part 2 to be released.

[0100] The counter-surface 57 interacting with the projections 56 can be formed by a radial recess 68 at the base of the screw opening 31. Such a radial recess 68 can be provided at the end of the screw opening 31 of the mold cavity part 2 (see, for example, Figure 5) when viewed in the insertion direction of a mounting pin 39 into the screw opening 31. It can also be a radial recess 68 that is complete or only partially circumferential with respect to the longitudinal axis w, providing an entry space for the respective projection 56.

[0101] The projection 56 can – if necessary under load via the pin-side compression spring 61 – snap into place automatically in the radial recess 68 and thus come into a rear-engaging position against the counter surface 57 (see in particular Figures 7 and 11). In the basic position of the assembly tool 38, a secure rear-engaging position is thus achieved, in which the mold cavity part 2 can be removed by pulling it off in the direction of the longitudinal axis w of the mounting pins 39 using the assembly tool 38 (see Figure 8). The pulling direction is opposite to the insertion direction r. The mold cavity part 2 can also be mounted in the insertion direction r using the assembly tool 38 in this rear-engaging position.

[0102] The release of the locking mechanism between the assembly tool 39 and the mold cavity part 2 for the removal of the mold cavity part 2 from the assembly tool 38 is achieved by the aforementioned, intentionally brought about displacement of the actuating mandrels 47 relative to the pin bodies 46, which allows a radial inward deflection for the respective projection 56.

[0103] In order to be able to assemble and / or disassemble mold cavities 2 with different depths s, s' of the flange 18 – viewed in the direction of the longitudinal axis y – and thus preferably also of the screw openings 31, using the same assembly tool 38, the assembly tool 38 can have assembly pins 39 that are variable in length in the direction of the longitudinal axis w or are generally longer. For example, the free projection h of the assembly pins 39 beyond the retaining plate surface 45 facing away from the brackets 43 can be selected such that – with reference to the illustrated embodiment – ​​both mold cavities 2 with a depth s and with a depth s' in the area of ​​the flange 18 can be assembled and disassembled using the same assembly tool 38. can be. For example, the mounting pins 39 can be provided with a projection h' adapted to the depth s', so that with such a designed mounting tool 38 both mold cavity part 2 with a depth s and mold cavity part 2 with a depth s' as well as mold cavity parts 2 with a depth dimension that can lie between s and s' can be mounted and / or dismounted. List of reference symbols 1 plastic injection mold 29 counter surface 2 Mold cavity part 30 Cooling channel 3 Counterpart 31 Screw opening 4 Tool plate 32 Mounting screw 5 Hot runner assembly 33 Threaded hole 6 Plant area 34 Area 7 Injection channel 35 Contact surface 8 Injector nozzle 36 Channel section 9 Tuning plate 37 Injection port 10 Counter surface 38 Mounting tool 11 Support surface 39 Mounting pins 12 Counter support surface 40 Retaining plate 13 Breakthrough 41 Drilling 14 screw opening 42 radial step 15 bore 43 bracket 16 Form plate 44 section 17 Partial contour 45 Mounting plate surface 18 Flange 46 Pin body 19 Cylinder section 47 Pressurizing mandrel 20 mounting surface 48 radial collar 21 Contact surface 49 End 22 Front surface 50 Intake 23 Recess 51 Crossbar 24 Intake 52 Shoulder screw 25 Front 53 Bore 26 Back side 54 Threaded hole 27 Recess 55 Bore 28 Exclusion 56 Lead Opposite surface a extent Trigger section a' extension cone section b thickness Blocking section c Distance Cylinder compression spring d thickness Gripping recess e leg length Handle for diameter measurement Threaded hole g width Bore h protrusion dimension Stop h' Projection dimension Firing pin p arrow Radial recess r Insertion direction Interior thickness gasket thickness Opening depth Tuning plate and flow direction Tuning subplate x travel axis Sliding jaw tool part y longitudinal axis guide z bore axis w longitudinal axis

Claims

Claims 1. Plastic injection mold (1), comprising a tool plate (4) and a mold plate (16), wherein a injection channel (7) opens from the tool plate (4) into the mold plate (16), through which plastic is injected in a flow direction (u) into a mold cavity part (2), wherein the mold plate (16) has several mold cavities (2) each with an injection channel (7) and a mold cavity part (2) is held on the mold plate (16), wherein, furthermore, the mold cavity part (2) is inserted from a front side (25) of the mold plate (16) against the flow direction (u) of the plastic into the mold plate (16) which has a thickness (b) considered in the flow direction (u) and, in an insertion position thereby given, bears with a contact surface (20) against a counter contact surface (29) of the mold plate (6), characterized in that the mold cavity part (2) is formed in one piece, that the The mold cavity part (2) has an extent (a) when viewed in the flow direction (u),which essentially corresponds to the thickness (b) of the mold plate (16) and that the counter-contact surface (29) in the mold plate (16) is recessed relative to a surface (34) of the front of the mold plate (25) which otherwise surrounds the mold cavity part (2).

2. Plastic injection mold according to claim 1, characterized in that the mold plate (16) has one or more cooling channels (30) which are arranged at a distance (c) from the front (25) and approximately parallel to the front (25) when viewed in the direction of the mold plate thickness (b).

3. Plastic injection mold according to claim 1 or 2, characterized in that the injection channel (7) is a hot runner.

4. Plastic injection mold according to one of the preceding claims, characterized in that the mold cavity part (2) has a longitudinal axis (y) given in an insertion direction (r) and forms a partial contour (17) of the object to be injected given in the longitudinal axis (y).

5. Plastic injection mold according to one of the preceding claims, characterized in that the mold cavity part (2) forms a cylindrical section (19) which extends from the front (25) of the mold plate (16) to below the cooling channels (30).

6. Plastic injection mold according to one of the preceding claims, characterized in that, viewed from the front (25) of the mold plate (16), a tuning plate (9) is arranged below the mold plate (16), which extends with substantially the same thickness (d) between the mold plate (16) and the tool plate (4).

7. Plastic injection mold according to claim 6, characterized in that the tuning plate (9) can provide a support surface (35) for the cylinder section (19) of the mold cavity part (2).

8. Assembly tool (38) for mounting and / or dismounting a mold cavity part (2) into or from a mold plate (16) of a plastic injection mold (1), preferably a plastic injection mold (1) according to one of claims 1 to 7, wherein the mold cavity part (29) has two or more screw openings (31) by means of which the mold cavity part (2) can be fastened to the mold plate (16) with fastening screws (32), characterized in that the assembly tool (38) has two or more mounting pins (39) having a longitudinal axis (w) which, when the fastening screws (32) are removed, extend into the to fit screw openings (31), and that the mounting pins (39) have a projection (56) which can be moved transversely with respect to their longitudinal axis (w), for engaging behind a counter surface (57) of the mold cavity part (2).

9. Assembly tool according to claim 8, characterized in that the assembly tool (38) has a retaining plate (40) and that the assembly pins (39) penetrate the retaining plate (40).

10. Assembly tool according to claim 9, characterized in that the assembly pins (39) are acted upon by one or more brackets (43) which are attached to the retaining plate (40).

11. Assembly tool according to one of claims 8 to 10, characterized in that an assembly pin (39) has a tubular pin body (46) has an interior (69) in which an actuation mandrel (47) is accommodated.

12. Assembly tool according to claim 11, characterized in that the actuating mandrel (47) is designed to engage the projection (56).

13. Assembly tool according to one of claims 11 or 12, characterized in that the actuating mandrel (47) is movable against spring force relative to the pin body (46).

14. Assembly tool according to one of claims 11 to 13, characterized in that the bracket (43) is used to move the actuating mandrel. (47) is movable relative to the retaining plate (40).

15. Assembly tool according to one of claims 8 to 14, characterized in that the counter surface (57) is formed by a radial recess (68) of the screw opening (31).

16. Assembly tool according to one of claims 8 to 15, characterized in that the assembly pin (39) has two transversely displaceable projections (56) for engaging behind the counter surface (57).

17. Assembly tool according to claim 16, characterized in that the actuating mandrel (47) is designed to engage both projections (56) simultaneously.

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