DE19956338A1 - Molding tool for producing leather-faced plastic panels for motor vehicle interiors has a core with edge clamp for gripping the leather edges and transferring to a foaming tool - Google Patents

Abstract

A positive tool core(12) is used to preform a leather facing layer(14) and then transfer the layer into a complementary lower half of a tool for foaming onto the rear face of the leather. An edge clamp(16) semi-permanently connected to the core grips an edge strip(18) of the leather projecting beyond the tool core and in the foaming tool a recess supports the transferred edge clamp near the tool parting plane. An Independent claim is made for a process for producing leather-faced plastic components in which a projecting edge strip(18) of the leather(14) is gripped and sealed by an edge clamp(16), transferred to a foaming tool and the core(12) detached from the edge clamp and removed from the tool leaving the leather and clamp in position.

Description

The invention relates to a device and a method ren for the manufacture of clad moldings in particular especially for the interior of vehicles, according to The preamble of claim 1 and 20 respectively.

For the production of foam-backed leather-clad In nenausteile for motor vehicles it is already knows a leather dress sewn from individual cuts ent on one of the surface contours to be clad Submit speaking positive form core and in the Nega tivform half of the foaming tool to pass the desired seam course for complex geometries ensure. For fixing the position in the foaming tool and above all to reduce rejects through over foaming agent, it is common here, the Le the dress in the edge area of the mold nest with adhesive tape stick tight. However, this requires elaborate ma working properly and often does not succeed especially when it is over the tool edge protruding leather edge is irregularly shaped.  

Based on this, the object of the invention reasons, a device and a method of the beginning specified type to improve that an op Timed production process with a low reject rate and high quality of products is achieved.

To solve this problem is the in claim 1 or 20 specified combination of features proposed. Advantageous refinements and developments of Invention result from the dependent claims.

The invention is based on the idea of reliable seal in the critical edge areas easy to use sealants. Dement speaking according to the invention a releasable with the bottom Sitivformkern connectable edge holder to both sides encompassing bracket over an edge contour of the Positive molding core protruding edge strip of the flat materials and one formed on the hollow tool Holder holder for holding the edge holder in the area the tool interface proposed. With that he will is enough that with good access a safe Ab seal can be made and in this form also remains in the tool. Elaborate craft There is no need for any work, and it becomes more reliable  relaxed process guaranteed.

The edge holder advantageously consists of an un ter and upper clamping half, the clamping halves with mutually facing clamping surfaces for sealing clamping bracket of the edge strip against each other are closable. So that the sealing function on be enables a particularly simple way. Limit at the same time the clamping halves with their clamping surfaces are part of the Parting surface of the hollow tool and can thus be integrate cheaply into this.

To securely surround the flexible flat material it is advantageous if the clamping surface of the lower clamping half in the connected state with the positive mold core connects flush to its edge contour.

In terms of construction, it is particularly favorable if the edge holder is annular and transverse to Ring axis is divided into two.

To ensure a reliable seal even with irregular To allow the edge to run, it is advantageous if the clamping surfaces by preferably as a silicone molding parts trained and replaceable in case of wear soft elastic insert parts or coatings  det.

To secure the edge holder against change of position This is before the transport into the hollow tool partially by means of a transport lock on the Lockable positive mold core, the transport locks tion to remove the positive mandrel from the cavity of the tool during the tool filling in the Holder receptacle remaining edge holder is detachable.

For a simple, yet reliable locking to ensure a further version provides that the positive mold core a receiving party to form conclusive insertion of the lower clamping half of the edge has holder, and that the upper clamping half by means a locking device force and optionally form engaging with the lower half of the clamp is feasible.

The holder receptacle is advantageously by each a formed on the mold halves of the hollow tool, receiving groove open towards the separating surface. There it is provided that the receiving groove of the lower one Mold half of the hollow tool to the contour of the upper one Clamping half of the edge holder is adapted, and vice versa  returns.

Especially with positive mold cores with high weight it is beneficial if this along with that locked edge holder by means of a transfer device tion in a swivel and / or linear and / or rotation movement can be used in the hollow tool. A be particularly cheap version provides that two to one other parallel swivel axes on opposite Sides of the fixed lower mold half arranged and that the upper mold half and the positive mold core alternately around one of the swivel axes are pivotable towards the lower mold half.

It is for fixing and transferring the flat material advantageous if the positive mold core and the lower Mold half a variety of with a suction and / or Pressure source connectable, at the respective the Flachma material receiving surface distributes opening channels exhibit.

The clamping halves of the edge holder and the positive form core as well as the holder holder of the hollow tool for mutual secure position determination mutually can be brought into engagement with one another, in particular by Centering surfaces made of hard metal form-fit elements  have elements.

Further advantageous designs provide that the Positive mold core as a mold half of a preform Stuff, in particular stamping tool is formed, and that the positive mold core is a temperature control device for Has heating or cooling of the flat material.

In the case of self-supporting molded parts, it is provided that the upper mold half of the hollow tool for positive locking sigen inclusion of a prefabricated supporting back part of the molded part is formed. Here it goes on advantageous if a Dichtvor in the hollow tool Direction for the linear pressing of a seal area of the flat material against a preferred as formed by the back part abutment surface is arranged. The sealing device can be a the lower mold half of the hollow tool Sealing groove and a recessed therein, un emerge from the sealing groove the inflatable and pressing against the flat material have a sealing hose. With this measure is achieved that the seal the assembly of the Tool not hindered and still the required Tightness guaranteed.  

In procedural terms, this is mentioned at the beginning te problem solved in that an over an edge contour of the positive mold core protruding edge strip of the Flat material by means of an ar on the positive mold core saved edge holder is sealingly held, and that the positive mold core after inserting the Flachma terials detached from the edge holder and from the hollow work Stuff is removed, the edge holder in a Hal remains of the hollow tool.

To optimize tool utilization, it is special favorable if during the closing time of the hollow tool in parallel work flat material for other molded parts to be manufactured on one or several Posi equipped with associated edge holders tive mold cores is prepositioned.

In the following the invention is based on one in the Drawing shown in a schematic manner example explained in more detail. Show it

Fig. 1 shows a device for producing clad with a leather hide interior components for motor vehicles;

Figure 2 shows a positive mold core for prepositioning the dermis with a Randhal ter locked in a vertical section.

FIG. 3 shows the edge holder in a partial enlargement of Figure 2 Ver.

Fig. 4 is a Hinterschäumwerkzeug the apparatus of Figure 1 having located therein the edge holder in a vertical section. and

Fig. 5 shows a sealing device of the Hinterschäumwerk zeugs in a fragmentary enlargement of Fig. 4.

The device shown in the drawing is used for the largely automated production of leather-clad foam-backed automotive interior components and be essentially consists of a two-part rear foaming tool 10 , one of the surface contour to be clad corresponding surface molding 12 for prepositioning and correctly inserting a leather dress 14 in the rear foaming tool 10 and an edge holder 16 for sealingly holding an edge strip 18 projecting beyond the region to be back-foamed, of the leather dress 14 . Basically, the clothing can also be formed by other flexible materials, for example textile surfaces.

As best seen in FIGS . 2 and 3, the ring-shaped edge holder 16 comprises a lower clamping half 20 and an upper clamping half 22 . The lower re clamping half 20 can be positively inserted into a circumferential receiving part 24 of the positive mold core 12 , while the upper clamping half 22 can be brought into engagement with the lower clamping half 20 by means of a knee lever mechanism 26 in a force-fitting and positive manner. The toggle lever lock 26 thus serves as Transportsi assurance for the positional locking of the edge holder 16 on the positive mold core 12 when described below NEN implementation in the rear foam tool 10th The Khemm halves 20 , 22 and the positive mold core 12 are made of aluminum for weight reasons and can be mutually centered via steel insert parts 28 as form-locking elements.

The clamping halves 20 , 22 have mutually facing clamping surfaces 32 , 34 which are formed by replaceable silicone molded insert parts 36 , 38 in the event of wear. The clamping surface 32 of the lower clamping half 20 is flush with the edge contour 40 of the posi tivformkerns 12 , so that the leather dress 14 together with its protruding edge strips 18 is placed over the entire surface and can be preformed. By locking the toggle lever mechanism 26 , the clamping surfaces 32 , 34 can be closed against each other with tight intermediate clamping of the edge strip 18 , the soft elastic insert parts 36 , 38 compensating for possible free cuts and thickness differences of the edge strip 18 .

In order to detachably fix the leather cladding 14 , the positive mold core 12 has a multiplicity of channels 42 which can be connected via a common distributor chamber 44 to a suction / pressure source (not shown) and which are distributed over the mold surface 46 . Basically, it is possible that the positive mold core 12 is used not only as a transport aid, but also as a tool half of an embossing tool. In this case, the positive mold core 12 is provided with heating channels 48 in order to stabilize the leather dress 14 in the embossed shape by thermal treatment.

As is apparent from FIGS. 1 and 4, the rear foaming tool 10 comprises a lower mold half 50 and an upper mold half 52, which are under the limitation of a die cavity 54 at a parting surface 56 gegenein other closable. The lower mold half 50 has a leather dress 14 receiving, to the positive mold core 12 complementary mold cavity 58 , while in the mold cavity 60 of the upper mold half 52 a prefabricated, for example, as an injection molded part supporting back part 62 can be inserted in a form-fitting manner.

To accommodate the edge holder 16 , the rear foam tool 10 has a holder receptacle, which is formed by a respective formed on the mold halves 50 , 52 , around the respective mold cavity 58 , 60 circumferential and open to the Trennflä surface receiving groove 64 , 66 . The flanks of the receiving grooves 64 , 66 converge to the bottom of the groove, so that when the tool is closed, the upper clamping half 22 positively engages in the lower receiving groove 64 and the lower clamping half 20 in the upper receiving groove 66 . Here too, steel insert parts 28 are seen as positive locking elements before wear reduction.

Heavy positive mold cores 12 , such as those used in the manufacture of instrument panels, are expediently placed in the rear foam tool 10 by means of a transfer device after the pre-fitting with the leather dress 14 in conjunction with the edge holder 16 . An optionally hydraulically betae tigbare pivoting device 68 is provided for this purpose in the shown game Ausführungsbei, the lower through between the stationary mold half 50 and the male mold core 12 to form a Schwenkach se 70 rotatable pivot hinges 72 is formed is arranged. In principle, as an alternative to a pivoting movement, linear and, if necessary, rotary movements can be provided in order to transport the positive mold core 12 into the back-foaming tool 10 or remove it again. To close the rear foaming tool 10 between the mold halves 50 , 52 arranged swivel share kidney 74 are provided, which are rotatable about a pivot axis 76 bar. Particularly in the case of elongated rear foaming tools 10 , it is advantageous to shorten the pivoting paths if the pivot axes 70 , 76 are arranged parallel to one another on the opposite longitudinal sides of the lower mold half 50 .

For the safe transfer of the leather dress 14 from the positive mold core 12 to the lower mold half 50 , this also has suction channels 78 , which are connectable via a distributor chamber 80 to a suction source, not shown, and open onto the wall of the mold cavity 58 .

When the tool is closed, the part of the tool cavity 54 remaining between the leather dress 14 and the back part 62 can be acted upon with a PUR foam plastic 82 which can be cured with the addition of heat (heating channels 84 ). The sealing edge holder 16 prevents unintentional leakage or trespassing of the foam plastic 82 on the visible side of the leather dress 14th In order to ensure a direct contact of the leather dress 14 against the back part 62 in predetermined areas, an additional sealing device 86 is arranged in the rear foaming tool 10 . As can best be seen from FIG. 5, the Dichtvorrich device 86 has a sealing groove 88 formed in the lower mold half 50 and a recess sunk therein, pressurizable via a pressure channel 90 and thereby protruding from the sealing groove 88 outstanding hose 92 . In the inflated state, the sealing tube presses the leather covering 14 firmly against an abutment surface 94 of the back part 62 .

To produce a leather interior 14 , the hardened foam plastic 82 and the back part 62 be standing interior fitting, the prepared leather dress 14 is inserted into the lower mold half 50 by swiveling the positive mold core 12 and the rim holder 16 locked onto it, the pressure and suction channels le 42 , 78 can be controlled accordingly for safe takeover. Then the positive mold core 12 is released from the edge holder 16 remaining in the holder receptacle of the rear foaming tool 10 and pivoted back into its starting position. Then the upper mold half 52 with the back part 62 inserted therein is closed against the lower mold half. Then the foam plastic 82 is injected into the remaining tool cavity between the back part and the leather dress and cured in order to finally be able to remove the finished molded part from the tool. It is advantageous if, during the mold closing time, the leather dress for the next molded part to be produced is already pre-positioned in a parallel operation on the positive mold core 12 equipped with an additional edge holder 16 . Depending on the cycle times, a plurality of positive mold cores 12 and additional edge holders 16 can be assigned to a back-foaming tool 10 in order to optimize the tool utilization.

Claims (21)

1. A device for the production of clad form parts in particular for the interior of driving witnesses, with a branch on a dividing surface ( 56 ), preferably as a back-foaming tool formed from hollow tool ( 10 ) for bringing a curable plastic material ( 82 ) on to the visible side Cladding of the molded part provided, in particular formed by a leather skin, flexible flat material ( 14 ), and one of the surface contours to be covered correspond to the positive mold core ( 12 ) for prepositioning and correctly inserting the flat material ( 14 ) into the complementary lower mold half ( 50 ) of the hollow tool ( 10 ), characterized by a detachable with the positive mold core ( 12 ) connectable edge holder ( 16 ) for holding on both sides around an edge contour ( 40 ) of the positive mold core ( 12 ) projecting edge strip ( 18 ) of the flat material ( 14 ), and one on the hollow tool ( 10 ) trained holder receptacle ( 64 , 66 ) to take on the edge holder ( 16 ) in the area of the separation surface ( 56 ). 2. Device according to claim 1, characterized in that the edge holder ( 16 ) has a lower clamping half ( 20 ) and an upper clamping half ( 20 ), and that the clamping halves ( 20 , 22 ) with mutually facing clamping surfaces ( 32 , 34 ) for sealing clamping mounting of the edge strip ( 18 ) against each other are closable. 3. Apparatus according to claim 2, characterized in that the clamping surface ( 32 ) of the lower clamping half ( 20 ) in the connected state with the positive mold core ( 12 ) connects flush to the edge contour ( 40 ). 4. Device according to one of claims 1 to 3, characterized in that the edge holder ( 16 ) is ring-shaped and branches are transverse to the ring axis. 5. Device according to one of claims 2 to 4, characterized in that the clamping surfaces ( 32 , 34 ) are preferably formed by cast parts designed as replaceable silicone mold soft elastic insert parts ( 36 , 38 ) or coatings. 6. Device according to one of claims 1 to 5, characterized in that the edge holder ( 16 ) with means of a transport lock ( 26 ) against situation changes during transport in the hollow tool ( 10 ) secured to the positive mold core ( 12 ) arre animal . 7. The device according to claim 6, characterized in that the transport lock ( 26 ) for removing the positive mold core ( 12 ) from the hollow tool ( 10 ) from the in the holder receptacle ( 64 , 66 ) remaining edge holder ( 16 ) is releasable. 8. Device according to one of claims 2 to 7, characterized in that the positive mold core ( 12 ) has a receiving part ( 24 ) for positively inserting the lower clamping half ( 20 ) of the edge holder ( 16 ), and that the upper clamping half ( 22nd ) can be brought into engagement with the lower clamping half ( 20 ) by means of a locking device ( 26 ) in a non-positive and, if appropriate, positive manner. 9. Device according to one of claims 1 to 8, characterized in that the holder receptacle by one on the mold halves ( 50 , 52 ) of the hollow tool ( 10 ) formed, to the separating surface ( 56 ) open receiving groove ( 64 , 66 ) is formed. 10. The device according to claim 9, characterized in that the receiving groove ( 64 ) of the lower half ( 50 ) of the hollow tool ( 10 ) to the contour of the upper clamping half ( 22 ) of the edge holder ( 16 ) and the receiving groove ( 66 ) upper mold half ( 52 ) is adapted to the contour of the lower clamping half ( 20 ). 11. The device according to one of claims 1 to 10, characterized in that the positive mold core ( 12 ) together with the edge holder ( 16 ) locked thereon by means of a transfer device ( 68 ) in a pivoting and / or linear and / or rotary movement in the hollow tool ( 10 ) can be used. 12. The device according to one of claims 1 to 11, characterized in that two mutually parallel pivot axes ( 70 , 76 ) on opposite sides of the fixed lower mold half ( 50 ) are angeord net, and that the upper mold half ( 52 ) and the positive mold core ( 12 ) around one of the pivot axes ( 70 , 76 ) can be pivoted alternately against the lower mold half ( 50 ). 13. Device according to one of claims 1 to 12, characterized in that the positive mold core ( 12 ) and the lower mold half ( 50 ) accommodate a plurality of connectable to a suction and / or pressure source, on the respective the flat material ( 14 ) the surface distributed channels ( 42 , 78 ) for fixing and transferring the flat material ( 14 ). 14. Device according to one of claims 2 to 13, characterized in that the clamping halves ( 20 , 22 ) of the edge holder ( 16 ), the positive mold core ( 12 ) and the holder receptacle ( 64 , 66 ) of the hollow tool ( 10 ) mutually in with each other Have engageable form-locking elements ( 28 ), in particular formed by centering surfaces made of hard metal, for mutually fixing the position. 15. The device according to one of claims 1 to 14, characterized in that the positive mold core ( 12 ) is designed as a tool half of a preforming tool, in particular special embossing tool. 16. The device according to one of claims 1 to 15, characterized in that the positive mold core ( 12 ) has a temperature control device ( 48 ) for heating or cooling the flat material ( 14 ). 17. Device according to one of claims 1 to 16, characterized in that the upper mold half ( 52 ) of the hollow tool ( 10 ) is designed for the positive reception of a prefabricated supporting back part ( 62 ) of the molded part. 18. Device according to one of claims 1 to 17, characterized by a in the hollow tool ( 10 ) arranged sealing device ( 86 ) for linieniformi pressing a region to be sealed of the flat material ( 14 ) against a preferably formed by the back part ( 62 ) abutment surface ( 94 ). 19. The apparatus according to claim 18, characterized in that the sealing device ( 86 ) in the lower mold half ( 50 ) of the hollow tool ( 10 ) formed sealing groove ( 88 ) and a recessed therein arranged under pressure from the sealing groove ( 88 ) emerging and against the flat material ( 14 ) pressing inflatable sealing hose ( 92 ). 20. A process for the production of clad moldings, in particular for the interior of vehicles, in which a flexible sheet material ( 14 ) provided for the visible cladding of a molded part, in particular formed by a leather skin, prepositions on a positive mold core ( 12 ) corresponding to the surface cladding and by means of the positive mold core ( 12 ) for the rear application of a curable plastic material ( 82 ) in a complementary lower mold half ( 50 ) of a two-part, preferably vorzugwei se formed as a foam tool ( 10 ) is inserted in the correct position, characterized in that a an edge contour (40) of the male mold core (12) projecting edge strip (18) of the flat material (14) is held sealingly by means of a locked to the male mold core (12) edge of the holder (16), and in that the male mold core (12) after the insertion of the sheet material ( 14 ) v on the edge holder ( 16 ) and removed from the hollow tool ( 10 ), the edge holder ( 16 ) remaining in a holder receptacle ( 64 , 66 ) of the hollow tool ( 10 ). 21. The method according to claim 20, characterized in that during the closing time of the hollow tool ( 10 ) flat material ( 14 ) for further mold parts to be produced on one or more with associated edge holders ( 16 ) equipped with positive mold cores ( 12 ) before.