DE102010053106A1 - Method and tool device for producing an interior trim part - Google Patents

Abstract

The invention relates to a method for producing an interior trim part for a vehicle and a tool device for producing an interior trim part.

Description

The invention relates to a method for producing an interior trim part for a vehicle and to a tool device for producing an interior trim part.

Such methods and tool devices are basically known. They are used to make interior trim parts used in interior trim of vehicles. The interior trim parts serve to disguise structural installations of a vehicle, in particular the chassis concerning or parts of the A, B or C-pillar. The area between the windscreen and the vehicle occupant, referred to as the instrument panel, is also covered by interior trim parts. In modern vehicles, a variety of security devices for the passengers are provided. Among other things, such safety devices are installed in the form of airbags in the vehicles. Such airbags are used to passengers, especially sensitive body parts of the passengers to catch and decelerate in the event of a crash, so that a traumatizing contact between the passenger and an interior trim part can be avoided. For this purpose, the airbags are arranged, for example, as head airbags in the steering wheel or for the passenger of a motor vehicle above the glove compartment. Other airbags, such as knee airbags, side head airbags, so-called airbag curtains are known to secure the passengers.

In order to be able to ensure a high visual quality for the interior of a vehicle on the one hand, but not to impair the functionality of the airbags, the interior trim parts are formed by known methods such that they also cover airbag receiving spaces in which the folded airbags in a resting position waiting for their deployment. In case of use, these covers of the airbag receiving spaces must fold to the side, or tear, so that the airbag unfold and can be performed during inflation in its locking position. It should be ensured that the parts of the interior trim parts which tear open or unfold in order to give the airbag the desired freedom of movement into the interior of a vehicle do not fly uncontrollably through the interior of a motor vehicle. For this purpose, these interior trim parts are connected to other interior trim parts, so they are intercepted or held during the unfolding so to speak. In particular, such connections have hinge functions, so that a folding over of the corresponding covering interior trim parts takes place in order to release the airbag receiving space.

Since a very high energy is introduced into the unfolding interior trim part during the opening of the airbag receiving space, in particular when the interior lining is torn over predetermined breaking points, such hinge areas are correspondingly strong. Partly, in known methods, net-like reinforcing mats have been used, which from below in the transition region between the pop-up interior trim part and a static interior trim part, the hinge effect, or support, so that is prevented with greater certainty that the interior trim part through the passenger compartment of the motor vehicle flies. A disadvantage of the known method is that such mats in a separate operation from below to the interior trim panel, or attached to two adjacent interior trim parts, in particular must be glued. This additional operation creates higher costs and a longer production time for an interior trim part.

It is an object of the present invention to overcome the disadvantages explained above. In particular, it is an object of the present invention to provide a method which provides the possibility, inexpensively and by means of a simple production method, of producing an interior trim part which is suitable for covering an airbag receiving space and against flying the interior trim part into the passenger compartment a motor vehicle is secured when the airbag is triggered.

The above object is achieved by a method having the features of independent claim 1 and by a tool device having the features of independent claim 9. Advantageous embodiments result inter alia from the subclaims appended to the independent claims.

• • Vorsehen zumindest einer flexiblen Verstärkungsmatte mit einer unteren Seite und einer oberen Seite,
• • Anordnen der Verstärkungsmatte mit der unteren Seite auf einer ersten konturgebenden Oberfläche eines ersten Werkzeugteils einer Werkzeugvorrichtung,
• • Schließen der Werkzeugvorrichtung durch ein zweites Werkzeugteil, dessen zweite konturgebende Oberfläche der oberen Seite der Verstärkungsmatte zugewandt ist, und dadurch Ausbilden einer Kavität zwischen den beiden Werkzeugteilen, in der die Verstärkungsmatte angeordnet ist,
• • Einbringen fließfähigen Matrixmaterials in die Kavität der Werkzeugvorrichtung in einer Richtung, die zumindest am Ort der Einbringung entlang der oberen Seite und/oder der unteren Seite der Verstärkungsmatte gerichtet ist.

In a method according to the invention for producing an interior trim part for a vehicle for covering an airbag receiving space, the following steps are used:

• Providing at least one flexible reinforcing mat having a lower side and an upper side,
• Arranging the reinforcing mat with the lower side on a first contouring surface of a first tool part of a tool device,
• Closing the tool device by a second tool part, the second contouring surface faces the upper side of the reinforcing mat, and thereby forming a cavity between the two tool parts, in which the reinforcing mat is arranged,
• • introducing flowable matrix material into the cavity of the tooling device in a direction directed at least at the location of insertion along the upper side and / or the lower side of the reinforcement mat.

A method according to the invention contains several advantages. On the one hand it is possible in this way that a reinforcing mat is provided, which is brought in the same operation in its function-determining position, in which the interior trim part is made. Interior trim panels are often manufactured by injection molding using liquid matrix material, so that a method according to the invention can be ideally coupled to an existing manufacturing process for the interior trim panel without the need for new tooling or longer manufacturing costs.

A further advantage of a method according to the invention is that, by inserting the reinforcing mat in a cavity formed between two tool parts, this reinforcing mat is introduced in a form-fitting manner into the interior trim part. In the manufacturing process, therefore, an encapsulation of the reinforcing mat takes place, so that a substantially complete embedding of this reinforcing mat takes place in the material of the interior trim part. This has the advantage that a single interior trim panel can be used to cover both an airbag containment space and an area behind the instrument panel that surrounds the airbag containment space. Thus, the interior trim panel has a portion for covering the airbag accommodating space and a static portion that does not substantially move when the airbag accommodating space is opened. This can be unsightly shocks or grooves in the visual appearance of an instrument panel avoided or reduced.

For the triggering of an airbag predetermined breaking points, or predetermined breaking lines or predetermined breaking surfaces may be provided in the interior trim part, along which it ruptures by an inflating airbag and its pressure acting from behind on the interior trim panel, this. The necessary hinging action for unfolding the interior trim panel to clear the path for the inflating airbag from the airbag containment space is provided by a substantially integral material bridge between a stationary portion of the interior trim panel and a moving portion that is at rest the airbag receiving space covers formed. In this transition region, the reinforcing mat is advantageously arranged. Thus, this reinforcing mat reinforces this transition region which may also be referred to as a hinge region, so that a tearing of the interior trim part in the hinge region possibly caused by the high force when opening the airbag receiving chamber, no tearing of a part of the interior trim part can take place. The moving portion of the interior trim panel remains in frictional contact with the remainder of the interior trim panel, at least over the reinforcement mat, and is thereby secured against flying around in the passenger compartment of the motor vehicle.

Also advantageous when using a method according to the invention is that in this way a crushing of the reinforcing mat, or a pressure of the reinforcing mat is avoided to the contouring surface of the first tool part. In processes in which the injection of the liquid matrix material by the second tool device, that is substantially perpendicular to the upper side of the reinforcing mat, this is pressed by the incoming matrix material against the contouring surface of the first tool part. This pressure can be 1000 bar and more, in particular up to 3000 bar due to the high injection pressures used. Since it is preferred to use a reinforcing mat of a low cost but stable material, particularly a material having sufficient flexibility to accommodate the necessary hinge movement of the interior trim panel, such high pressure would result in compression of the reinforcing mat material. In other words, during injection, according to known methods, such a reinforcement mat is compressed and fixed in the compressed form during cooling of the matrix material. Thus, even a relatively flexible material of a reinforcing mat by a known method loses at least a part of its functionality, which is necessary to produce the hinge effect.

By means of a method according to the invention it is now possible to avoid this squeezing of the material of the reinforcing mat and its movement to the underside, that is to say to the contouring surface of the first tool part. By injecting in the direction of the lower and / or the upper side of the reinforcing mat, a force direction in the direction of the contouring surface of one of the two tool parts avoided. Rather, it is injected substantially tangentially to the reinforcing mat, so that no pressure is introduced substantially perpendicular to the contouring surfaces of the tool parts.

Thus, neither a compression of the reinforcing mat, nor a shift to one of the contouring surfaces out.

By avoiding displacement to one of the contouring surfaces, it is achieved that the reinforcing mat substantially completely comes to rest within the matrix material. Accordingly, during the curing of the matrix material and in the cured state of the interior trim part, the reinforcement mat is substantially completely enclosed by matrix material by a method according to the invention. In this way, both above the upper side, as well as below the lower side of the reinforcing mat sufficient material thickness of the matrix material, so that both sides of the interior trim panel can be processed with further processing steps. In particular, laminating methods which laminate one or both sides of the interior trim part with further layers are possible in this way.

In laminating, which can be done with adhesive or adhesive, a certain minimum thickness of the material is necessary to ensure sufficient bonding between the coating and the load-bearing interior trim part. By means of the method according to the invention, a sufficient thickness of matrix material is now provided on both sides of the reinforcing mat, so that laminating methods can also be carried out without adhesive by fusing with an additional coating on one or both sides of the interior trim part without any problems.

Of course, not only a single location of the introduction of the flowable matrix material but also a plurality of Einbringorten be provided. It is advantageous if the introduction points have an insertion direction aligned with each other, which are directed substantially all in the same direction. In this way, a common flow front of the flowable matrix material can be formed, which moves through the cavity and on the opposite side pushes out the previously contained in the cavity gas. In this way it is possible to minimize or even avoid gas pockets which would reduce the quality of the interior trim panel. Advantageously, an orientation according to the invention of the introduction, namely along the lower and / or the upper side of the reinforcing mat is provided at all locations of the introduction.

Alternatively or additionally, depending on the orientation of the reinforcing mat, it is also possible that the introduction of flowable matrix material takes place at the location of introduction along, in particular tangentially, the contouring surface of one or both of the tool parts.

With the aid of a method according to the invention, moreover, the wall thickness of the interior trim part can be reduced, since the integral design of the matrix material and the reinforcement mat prevents increased protection against unwanted flying around a section of the interior trim part in the passenger compartment of a motor vehicle. The advantageous central arrangement of the reinforcing mat in the interior of the matrix material, in particular by the spacing of the two outer sides of the matrix material of the interior trim part also prevents the reinforcing mat from wholly or partially protruding on one of the surfaces of the interior trim part. Such a marking is a great disadvantage, regardless of whether subsequently a lamination step, as has been described above, takes place. Namely, such a markup significantly reduces the optical quality. In addition, such a sign is recognizable not only visually but also haptically, so that a user of a vehicle would feel the elevations of such a reinforcement mat when touching such a surface by hand.

The formed cavity in a method according to the invention preferably has a thickness of about 2.5 mm plus / minus 0.5 mm. The reinforcing mat itself has a thickness of about 1 mm, plus / minus 0.5 mm. Thus, with preferably central arrangement of the reinforcing mat on average about 0.75 mm remain on each side of the reinforcing mat as residual strength of the matrix material of the interior trim part to prevent a sign of the reinforcing mat on the top of the interior trim part and beyond the possibility of an additional Lamination.

The cavity is advantageously not completely closed, but provided either with openings or with air outlet valves, which make it possible to escape in the course of the injection process of the liquid matrix material located in the cavity gases. This is advantageous since in this way gas inclusions which would impair the material thickness or its optical quality are avoided.

It may be advantageous if in a method according to the invention at least one reinforcing mat is provided on its lower side and / or on its upper side with spacers, the reinforcement mat after placing on the first tool part and / or after placing the second tool part of at least one Keep the respective tool parts at a minimum distance from them. Such spacers may be, for example, pins, noses or small foot-like elements, which define in this way the starting position of the reinforcing mat for the injection process. The spacers are advantageously designed such that they have a very low geometric expression along the respective contouring surface compared to the reinforcing mat. In addition, they are advantageously made of a material which would not or only insignificantly on the top of the interior trim part, on which abut the spacers, would be. This can be made possible, for example, by a high flexibility of the spacers, which substantially matches the material properties of the flowable matrix material in its cooled state. It is therefore advantageous if the spacers are made of the same or a very similar material, as the matrix material used. A method according to the invention becomes even more precisely definable through the use of spacers, so that the quality of the interior trim parts produced in this way is even further improved.

Furthermore, it can be advantageous if, in a method according to the invention, after the reinforcing mat has been arranged on the lower tool part, the reinforcing mat is fixed in a position in which the reinforcing mat is partially fixed in a section of the interior trim part to be produced, which covers the airbag cover. Recording room is provided, and partially located in a separate section. In other words, not only the final shape of the interior trim part is defined by the contouring surfaces of the tool parts, but also the respective function of each section. Thus, there is at least a portion of the interior trim panel which later serves to cover the airbag containment space and separate sections that cover static areas of, for example, an instrument panel. Between such sections advantageously runs the reinforcing mat. Such insertion according to the invention has the result that the reinforcing mat extends over the two sections, so that the transition between the two sections is reinforced with the reinforcing mat. Exactly this transition between the two sections is used as a hinge area when opening the opening of the airbag accommodation space, that is, when moving the portion of the interior trim part covering the airbag accommodation space relative to the static portions of the interior trim part. The hinge effect of this area is formed or improved by the reinforcing mat arranged according to the invention.

It may also be advantageous if, in a method according to the invention, the fixing takes place in an edge region of the reinforcing mat, which is arranged in the flow direction of the introduced liquid matrix material before the rest of the reinforcing mat and after the introduction of the liquid matrix material. In other words, a fixation is performed in this way, which is defined locally even more precisely. The location of the fixation is arranged downstream of the injection location, and the remainder of the reinforcement mat is in turn arranged downstream of the fixation location. A flow front of an introduced flowable matrix material will thus first reach the location of the fixation, starting from the introduction site, and proceeding slowly therefrom in the direction of the reinforcement mat. Due to the friction between the flowable matrix material and the retained reinforcing mat, the flowable matrix material will exert a force on the reinforcing mat which is directed in the direction of flow of the matrix material. In other words, the flowable matrix material tries to drag the reinforcing mat with it, which is prevented by the fixation at the desired position of the reinforcing mat.

In order to ensure that the applied force of the flowable matrix material does not produce any change in the positioning of the reinforcing mat, in particular no compression or creasing of the reinforcing mat, an arrangement according to the invention as described above is selected. In this way, the force is introduced only in one direction on the reinforcing mat, which is directed away from the location of the fixation of the reinforcing mat. In other words, the matrix material tries to pull the reinforcing mat away from the location, that is to stretch it. A reverse force direction, which would cause a compression of the reinforcing mat, is thus avoided. Thus, it is possible that the fixation of the reinforcing mat takes place only at a single point, and the opposite edge regions of the reinforcing mat remain without fixation. The stretching of the reinforcing mat is irrelevant insofar as no upsetting or warping or folds of the reinforcing mat are produced in this way and, moreover, the stretch is automatically restored after the introduction of the matrix material in which the latter is still in the liquid state the elasticity of the reinforcement mat is reversed.

Alternatively or additionally, it is also possible that not only at a single location in the interior of the tool device, the reinforcing mat is fixed, but a variety of locations. The fixation on a plurality of edge regions, in particular up to a fixing around the reinforcing mat, is possible in the context of the present invention.

It can also be advantageous if, in a method according to the invention, after the introduction of the liquid matrix material and its at least partial hardening, at least one side of the produced interior trim part is laminated with a coating. Such a coating can in particular improve the optical and / or haptic appearance of the interior trim part. For example, leather or synthetic leather or plastic films which are adapted to the desired effect in the interior of a vehicle with regard to their appearance or their feel can be used as coatings. Also multilayer laminations with multi-stage laminating are possible. Thus, it is conceivable that flexible, in particular foam-like layers are applied to the interior trim part, which are covered with a leather, a synthetic leather or a plastic layer. In this way, both the look and feel of the interior trim part are further improved.

The coatings explained above relate to the so-called A side of the interior trim part, that is to say the side which faces the passenger when the interior trim part is used in the motor vehicle, ie is visible to the passenger. Of course, it is also possible that alternatively or additionally, the so-called B-side, so the back of the interior trim part, which lies invisible to the passenger in a motor vehicle, is laminated. For example, lamination to the airbag receiving space is possible, so that a surface on the B side of the interior trim part is achieved, which improves the functionality of the airbag. Here, for example, a reduction in the friction of the airbag on the interior trim part should be mentioned, so that the inflation after the opening of the airbag receiving space is slowed to a lesser extent by friction and in particular the risk of tearing the airbag on a roughened B-side is avoided.

In a method according to the invention, advantageously at least one reinforcing mat can have a net-like structure. A net-shaped structure is to be understood as meaning that the structure has, at least in sections, nodes between which reinforcing sections and empty sections are arranged substantially regularly or at least partially regularly. In particular, the reinforcing mat is designed as a network, in particular as a fabric. Fabrics have the great advantage that they can be provided as a net structure, ie as a reinforcing mat with very low weights and correspondingly favorable production methods. At the same time they achieve relatively high tensile strength in spite of low weights and despite favorable materials. Thus, a force that wants to pull the fabric apart, ie a force acting in an interior trim part to separate it from a fixed portion of the interior trim part, is thus very well held by such a fabric as a tensile stress. Since such fabrics have substantially little or no resistance to bending moments, the hinge functionality of the transition between the fixed portion and the moving portion of the interior trim panel is not affected or even aided.

It may also be advantageous if, in a method according to the invention, at least one reinforcing mat is made of a material that can connect to the liquid-introduced matrix material in a material-locking manner. In other words, at least partially, a material shortage can be generated in this way. The material closure has the advantage that during the deformation of the interior trim part during the inflation of the airbag no separation between the reinforcing mat and the matrix material can take place. The transmission of force between the matrix material and the reinforcing mat is thus improved by an at least partially joined material connection of the two materials.

Such an embodiment can be achieved, for example, in that both the matrix material and the material of the reinforcing mat are thermoplastic materials, while melting temperatures are in a similar range. In particular, the melting range, or the melting temperature of the matrix material is equal to or greater than the melting range, or the melting temperature of the reinforcing mat. Flowable matrix material, which is thus injected above the melting range at high temperature, will release this temperature at least partially for heating the reinforcing mat to the latter and also melt it at least at its surface. Advantageously, therefore, a compound of the surface of the reinforcing mat with the matrix material in a material-locking manner.

However, a material fit does not necessarily have to be generated. It is also possible that a strong trained positive connection between reinforcing mat and matrix material is generated. This can be achieved, for example, by a multiplicity of intersections, or by pores in the reinforcing mat. Reinforcing mats, which in particular at least partially have a sponge-like structure, or are made of a sponge-like fabric can achieve a strong fit between the matrix material and reinforcing mat by the penetration of the matrix material in these pores. Also in this way, the frictional engagement between the matrix material and reinforcing mat in heavy load situations is unlikely to be raised.

Furthermore, it can be advantageous if, in a method according to the invention, at least one weakening of the material is produced in a section of the interior trim part in the production of the interior trim part, in which no reinforcement mat is arranged. The provision of material weakenings serves to create predetermined breaking lines or predetermined breaking points or predetermined breaking surfaces. The weakening of the material is thus an area which, when force is applied to the interior lining part, ruptures it in a defined manner along the material weakening. In this way, the Aufreißfunktionalität and thus the subsequent movement of at least some portions of the interior trim part relative to fixed portions of the interior trim part can be previously defined.

The material weakenings are advantageously arranged in a region in which no reinforcing mat is provided. By spacing the material weakenings from the reinforcing mat, it can be ensured that tearing does not take place in the region of the reinforcing mat but separately therefrom. Thus, the reinforcing mat itself reinforces an area which is also supposed to be reinforced, while other areas without reinforcement remain deliberately unreinforced to serve as a tear-open area of a predetermined breaking point. The arrangement of the material weakening can be designed differently. Thus, it is possible that substantially a so-called orange peel opening is performed, which includes a material weakening substantially star-shaped expression. Also, H-shaped embodiments of the material weakening are conceivable, so that essentially two large flap parts are formed, which open in the opposite direction to release the airbag receiving space. The weakening of the material can for example already be preformed by the corresponding shaping of the contouring surfaces of the tool devices, so that a lower material thickness of the interior trim part during the injection molding process is achieved in the desired sections of the material weakening. The matrix material thus receives a smaller thickness there.

Another object of the present invention is a tool device for the production of an interior trim part with a method according to the invention. Such a tool device has a first tool part with a first contouring surface and a second tool part with a second contouring surface. The second tool part can be arranged with the second contouring surface with respect to the first contouring surface of the first tool part, whereby a cavity can be formed between the two contouring surfaces of the tool parts.

Furthermore, at least one injection opening for liquid matrix material is provided, the injection direction of which extends at the location of the injection opening along the first and / or second contouring surface. The injection opening may be either part of one of the two or both tool parts, or else be provided as a separate injection location, for example in the form of an injection nozzle. Of course, it is also possible that a plurality of injection openings is provided, but preferably have a substantially same orientation with respect to their injection opening. By the same orientation along a common direction of the injection openings, it is possible that a substantially uniform front of the flowable matrix material is generated when injected into the cavity, so that gas contained in the cavity is pushed out of the cavity from the front.

In order to ensure that no back pressure builds up in the cavity, it is advantageous to provide openings arranged at opposite ends of the injection opening with respect to the cavity. Such openings may also be arranged separately or else in one or both of the tool parts. These openings can also be coupled with valves, or valves can be arranged in the openings, which allow gas to escape from the cavity at a certain pressure. A return flow is not possible through these valve corners, which are advantageously designed as pressure relief valves, so that an intake of air from the outside into the cavity is avoided.

In a tool device according to the invention, it may be advantageous if a fixing device in the region of the first contouring Surface is provided to fix a reinforcing mat at its arranged position. Thus, such a fixing device serves to hold the reinforcing mat during the injection process in a method according to the invention at the predefined position. It can be designed in different ways. Thus, it is possible that the reinforcing mat is held in the desired position via a clamping device. This clamping device may be formed separately from the tool parts or else integrally. Also, the provision of nose-shaped projections or pins which can pass through a reinforcing mat, so on which a reinforcing mat can be placed, are conceivable as a fixing device. Such pins engage, for example, in the eyelets of a net-like structure of the reinforcing mat and fix it at the desired position against the flow direction of the introduced matrix material. The fixing device is thus sufficiently configured if it allows a fixation at least in a single direction, namely against the flow direction of the introduced through the injection port flowable matrix material. In this way, the reinforcing mat is left at the desired location and achieves a predefined result for the interior trim panel.

Furthermore, it may be advantageous if in a tool device according to the invention in the second tool part at least one air outlet valve for the cavity is arranged at a position with respect to the cavity in which no reinforcing mat is inserted in carrying out the method according to the invention. In other words, with respect to the current method, the exhaust valves for gas are spaced from the cavity by the inserted reinforcing mats. This is advantageous because the reinforcing mat already claimed even in the cavity space and thus displaces gas. The proportion of gas which must be removed from the areas in which no reinforcing mat is present is accordingly larger, as seen by the volume of the reinforcing mat. In addition, the flow of gas from the cavity beyond the outlet valves to the environment creates a direction of force due to the friction between the gas of the reinforcement mat. By disposing the valves at a distance from the areas with the reinforcing mat, it is prevented that a flow direction of the gas when flowing out is generated substantially perpendicular to the upper or lower side of the reinforcing mat. Rather, the gas which is present in the area around the reinforcing mat must, when injecting the matrix material, escape substantially along the upper and / or lower side of the reinforcing mat in order, after reaching the opening to the outlet valves, perpendicular to the respective contouring surface of the second tool part to escape from the cavity. The flow direction in the area of the reinforcing mat is correspondingly defined along the upper and / or the lower side of the reinforcing mat, so that the flow of the gas does not hinder the centering of the reinforcing mat in the interior of the matrix material of the interior trim panel.

The present invention will be explained in more detail with reference to the accompanying drawing figures. The terms "left", "right", "top" and "bottom" used herein refer to an alignment of the drawing figures with normally readable reference numerals. Show it:

1 1 is a schematic cross-sectional view of an embodiment of a built-in interior trim panel;

2 schematic cross-section of an embodiment of a tool device,

3 a further embodiment of a tool device in cross section,

4 an isometric view of an embodiment of a reinforcing mat,

5 a cross-sectional view of the reinforcing mat of 4 .

6a a further embodiment of a reinforcing mat,

6b a further embodiment of a reinforcing mat,

7 an isometric view of an embodiment of a first tool part with applied reinforcing mats, and

8th a schematic representation of another embodiment of a second tool part in plan view.

In 1 is a schematic cross-section of an embodiment of an interior trim panel according to the invention 10 represented in the arranged in the vehicle position. Here it can be seen that the interior trim part 10 extends over an area, partially an airbag-receiving space 100 covers. This section of the interior trim part 10 will be at the opening of the airbag 110 of this displaces and tears advantageously, not in 1 illustrated, predetermined breaking lines and moves relative to the fixed portion of the interior trim part 10 , which is to the left and right of the airbag storage room 100 is shown. In other words, so works the covering section of the Interior trim part 10 to one or both sides, thus providing the opening for the deploying airbag 110 free.

Also in 1 to recognize the corresponding arrangement with respect to the motor vehicle, there in the left upper end of the interior trim part 10 the following in the windshield 200 can be seen. The interior paneling part 10 , In particular, their portions for covering the airbag-receiving space 100 so flip in the direction of the interior and / or in the direction of the windshield 200 of the motor vehicle.

As in 1 can be seen further, is the interior trim part 10 with a reinforcement mat 20 to reinforce the same provided. The reinforcement mat 20 is inside the matrix material 40 of the interior trim part 10 arranged. Here is the reinforcement mat 20 completely of matrix material 40 surrounded by the reinforcing mat 20 not necessarily central, ie centered in the interior of the matrix material 40 must be provided. In addition, on the top, so the side of the interior trim part 10 , which faces the passenger compartment of the motor vehicle, a coating 50 to improve the appearance and / or the feel of the interior trim part 10 appropriate. This is in particular by gluing or fusing with the interior trim part 10 attached with this.

In 2 is a first embodiment of a tool device according to the invention 60 shown. This tool device 60 has a first tool part 62 and a second tool part 64 on. Each of these tool parts 62 and 64 has a contouring surface 62a and 64a representing the contour of the interior trim part to be produced 10 render complementary. In the situation the in 2 is shown, there is the tool device 60 already in a closed state, ie in a state in which the reinforcing mat 20 is inserted, and the second tool part 64 with its contouring surface 64a opposite the reinforcement mat 20 is arranged. By this arrangement of the two tool parts 62 and 64 each other becomes the cavity 66 between these two tool parts 62 and 64 educated. In this cavity is the reinforcement mat 20 ,

In 2 It can be seen that in this embodiment, the first tool part 62 is made in two parts. By the two-part embodiment, a groove is formed in the contouring surface 62a of the first tool part 62 a fixing device 70 for the reinforcement mat 20 forms. The reinforcement mat 20 is in its edge portion in this fixing device 70 , So inserted in this groove and jammed in this groove. The injection opening 68 the tool device 60 is in the flow direction of an introduced flowable matrix material 40 upstream of the fixing device 70 so that the force of the flowing matrix material 40 on the reinforcing mat only downstream of the fixing device 70 on the reinforcement mat 20 can work. In other words, the reinforcement mat becomes 20 exclusively stretched during the injection process and not compressed, so that wave formation or a folding or a fold of the reinforcement mat 20 can be avoided.

Of the 2 It can also be seen that, in this embodiment, downstream in relation to the flow movement in the direction of the flowable matrix material 40 on the first tool part 62 a material weakening 12 of the interior trim part 10 should be trained. This is the cavity 66 by an extension on the first tool part 62 narrowed so that its thickness during injection of the flowable matrix material 40 is reduced at this point. In this way, a material weakening 12 , So a predetermined breaking line, or a predetermined breaking point, or a predetermined breaking surface formed.

With reference to the embodiment of the 2 the mode of operation of a method according to the invention is briefly explained below.

After providing a reinforcement mat 20 , this will be with your bottom side 22 on the contouring surface 62a of the first tool part 62 appropriate. Optionally in the embodiment of the 2 becomes the reinforcement mat 20 in its edge section with the fixing device 70 connected so that a fixation in the flow direction of the injected flowable matrix material 40 and downstream of the injection port 68 he follows. Subsequently, the second tool part 64 placed so as to complete the tooling device that the contouring surface 64a of the second tool part 64 essentially opposite the reinforcement mat 20 with reference to its upper side 24 to lie down. This will create a cavity 66 between the two tool parts 62 and 64 formed in which the reinforcing mat 20 located.

After this placement, the injection process is started. Flowable matrix material 40 is through the injection port 68 into the cavity 66 introduced so that the flowable matrix material in the cavity 66 can distribute. Advantageously, the injection openings 68 all formed substantially rectified, so that the injection direction of all injection openings 68 is essentially the same. In this way, one forms common flow front of the flowable matrix material, passing through the cavity 66 flows through while enclosing the reinforcing mat and at the same gas, which in the cavity 66 is contained, displaced. That in the cavity 66 contained gas can be either at the other end of the cavity 66 , in 2 shown below right, escape, or by not shown openings, in particular with valves, from the cavity 66 escape.

After completing the introduction of the flowable matrix material 40 that is, after the substantially complete filling of the cavity 66 with the flowable matrix material 40 , this will be in the closed tooling device 60 held until sufficient cooling and concomitant solidification of the matrix material 40 is done. Subsequently, one of the two tool parts 62 or 64 be removed, so that a demoulding of the interior trim part 10 is possible. The finished interior trim part 10 has the reinforcing mat 20 from both sides of the interior trim part 10 spaced up. In particular, it is possible that the reinforcing mat 20 essentially centrally in the interior of the interior trim part 10 is arranged.

Next is the reinforcement mat 20 while over both sections of the interior trim part 10 guided, namely the portion which covers the airbag receiving space 100 is provided, as well as at least one other section, that is, a section at the opening of the airbag 110 remains in the static position while the covering portion of the interior trim part 10 relative to the static portion of the interior trim panel 10 moved, or rotated to it. The reinforcement mat 20 thus forms a hinge function in this way, or supports the hinge function of the transition region between these two sections.

In 3 is another embodiment of a tooling device 60 shown. This tool device 60 differs from the tool device 60 of the 2 in that the first tool part 62 easier, namely can be configured in one piece in particular. This is possible because an altered fixing device 70 is used. The fixing device 70 the embodiment of the 3 has a nose-shaped extension, which essentially as a nose or as a pin through the reinforcing mat 20 protrudes through. Especially with reinforcement mats 20 , which have a net-like structure, for example in the form of a fabric, this nose can thus protrude through the openings of the fabric or the network and a fixation of the matrix mat against forces in the direction of flow of an introduced matrix material 40 Offer. In the further functionality corresponds to the tool device 60 of the 3 the embodiment as shown in 2 is shown. In particular, a method according to the invention is carried out in the same way. Also in this embodiment, a material weakening 20 by a reduction of the material thickness of the matrix material in the interior trim part 10 generated.

4 shows an embodiment of a reinforcing mat according to the invention 20 , This is a section of a reinforcement mat 20 , wherein a very fine mesh structure with large openings in this reinforcement mat 20 is present. The network structure is formed by substantially perpendicular to each other fabric threads which are interconnected at nodes. The connection need not necessarily be material-locking, but can also be done by interweaving the individual trajectories of the network. On the bottom 22 , opposite the top 24 the reinforcement mat 20 are spacers 26 provided, which are arranged substantially at the nodes of the network structure.

These spacers 26 can be at any node, but need not be provided at each node. So it is possible that, for example in 5 represented, only at some nodes, or even on some network lines even the spacers 26 are provided. The attachment of the spacers 26 can either by integrally forming with the reinforcing mat 20 or by welding or gluing them to the reinforcing mat 20 respectively. The material of the spacers 26 is advantageously chosen so that it after the completion of the interior trim part 10 on the surface neither haptically nor visually appears. This can be achieved by, for example, forming a particularly flexible material which has little or no tact of the material of the matrix material in feel and / or appearance 40 different. In particular, therefore, similar or identical materials for the spacers 26 and the matrix material 40 used.

The 6a and 6b show further alternative embodiments of a reinforcing mat 20 , In these embodiments, the reinforcement mat 20 the net-like structures are significantly wider and accordingly combined with smaller openings. In other words, the free spaces between the individual network lines are significantly smaller and point in the case of 6a a substantially circular or elliptical and in the case of 6b a substantially square or rectangular shape. Depending on the design of the network lines, or the free spaces can thereby the force receiving direction, or the force absorption functionality of the reinforcing mat 20 to be changed. Especially tension inside the reinforcement mat 20 can be deliberately created or avoided in this way, so that improved support the hinge function, or only its training after the introduction of the reinforcement mat 20 in the interior trim part 10 becomes possible with a method according to the invention.

In 7 is an isometric view of an embodiment of a first tool part 62 shown. In this embodiment, it can be seen that in a method according to the invention also a plurality of reinforcing mats 20 can be used. In the embodiment of the 7 become three reinforcement mats 20 provided, all already on the contouring surface 62a of the first tool part 62 are arranged. As it is the first tool part 62 the embodiment of the 7 around a first tool part 62 as it already is to the 2 and 3 has been explained, also here a fixing device 70 , in the 7 not shown, be provided, a fixation of all reinforcing mats 20 in its edge area 20a performs. Thus, the fixation advantageously by the contouring surface itself, for example by a detent recess for clamping or an increase to engage in the reinforcing mat 20 achieved.

In 8th is an embodiment of a second tool part 64 shown, which for improved ventilation of the cavity 66 while performing the method of the invention. In the embodiment of the 8th are in the openings air outlet valves 65 provided, which air from the cavity 66 to the environment of the tool device 60 can give. By introducing matrix material 40 into the cavity 66 is pressurized air in it, or from the cavity 66 repressed. By providing air outlet valves 65 this displacement takes place in a defined manner, so that the type of displacement, the maximum resulting internal pressure in the cavity 66 and the direction of air flow when displacing the air can be defined.

In the embodiment of the 8th are the air outlet valves 65 while in sections of the second tool part 64 provided, which with the cavity 66 correlate that they are from the inserted reinforcement mats 20 which are shown as a dotted line in the 8th are shown are spaced. This will ensure that gas, which surrounds the reinforcement mats 20 around in the cavity 66 is not perpendicular to the bottom 22 or to the top 24 the reinforcement mats 20 can be displaced. Rather, the gas located there must first along the lower and / or upper side 22 . 24 the reinforcement mat 20 flow until it reaches the outlet opening and the air outlet valve 65 The closest one gets to. Only at this point can the flow be perpendicular to the contouring surface 64a of the second tool part 64 turn and through the air outlet valve 65 the cavity 66 leave. This ensures that the air flow, which by friction forces also a force on the reinforcing mat 20 does not exert this force in the direction of one of the contouring surfaces 62a or 64a the tool parts 62 or 64 causes. This is further ensured that even by the air friction a misplacement of the reinforcement mat 20 from the desired position inside the matrix material 40 of the interior trim part 10 is prevented.

It goes without saying that the embodiments explained above describe the invention by way of example. The individual embodiments can be freely combined with one another in a technically meaningful context, and do not limit the scope of the present invention.

LIST OF REFERENCE NUMBERS

10

Interior trim part

12

Materialverschwächung

20

reinforcing mat

20a

Edge area of the reinforcement mat

22

lower side

24

upper side

26

spacer

40

matrix material

50

coating

60

tooling

62

first tool part

62a

first contouring surface

64

second tool part

64b

second contouring surface

65

Air exhaust

66

cavity

68

Injection port

70

fixing

100

Air bag compartment

110

air bag

200

Windshield

Claims (11)

Method for producing an interior lining part ( 10 ) for a vehicle for covering an airbag receiving space ( 100 ), with the following steps: Providing at least one flexible reinforcement mat ( 20 ) with a lower side ( 22 ) and an upper side ( 24 ), • arranging the reinforcement mat ( 20 ) with the lower side ( 22 ) on a first contouring surface ( 62a ) of a first tool part ( 62 ) a tool device ( 60 ), • closing the tool device ( 60 ) by a second tool part ( 64 ), whose second contouring surface ( 64a ) of the upper side ( 24 ) of the reinforcement mat ( 20 ) and thereby forming a cavity ( 66 ) between the two tool parts ( 62 . 64 ), in which the reinforcement mat ( 20 ), introducing liquid matrix material ( 40 ) into the cavity ( 66 ) of the tool device ( 60 ) in a direction which, at least at the point of introduction along the upper side ( 24 ) and / or the lower side ( 22 ) of the reinforcement mat ( 22 ). Method according to claim 1, characterized in that at least one reinforcing mat ( 20 ) on its lower side ( 22 ) and / or on its upper side ( 24 ) with spacers ( 26 ), which reinforces the mat ( 20 ) after placing on the first tool part ( 62 ) and / or after placing the second tool part ( 64 ) of the respective tool part ( 62 . 64 ) at a minimum distance. Method according to one of the preceding claims, characterized in that after arranging the reinforcing mat ( 20 ) on the lower tool part ( 62 ) the reinforcement mat ( 20 ) is fixed in a position in which the reinforcing mat ( 20 ) partially in a portion of the interior trim part to be produced ( 10 ), which covers the airbag receiving space ( 100 ) is provided, and partially located in a separate section. A method according to claim 3, characterized in that the fixation in an edge region ( 20a ) of the reinforcement mat ( 20 ), which in the flow direction of the introduced liquid matrix material ( 40 ) in front of the rest of the reinforcement mat ( 20 ) and after the introduction of the liquid matrix material ( 40 ) is arranged. Method according to one of the preceding claims, characterized in that after the introduction of the liquid matrix material ( 40 ) and its at least partial hardening at least one side of the manufactured interior trim part ( 10 ) with a coating ( 50 ) is laminated. Method according to one of the preceding claims, characterized in that at least one reinforcing mat ( 20 ) has a reticulated structure. Method according to one of the preceding claims, characterized in that at least one reinforcing mat ( 20 ) is made of a material, the material fit with the liquid introduced matrix material ( 40 ) can connect. Method according to one of the preceding claims, characterized in that in the manufacture of the interior trim part ( 10 ) at least one material weakening ( 12 ) in a portion of the interior trim part ( 10 ), in which no reinforcing mat ( 10 ) is arranged. Tool device ( 60 ) for the production of an interior trim part ( 10 ) with a method according to claims 1 to 8, comprising a first tool part ( 62 ) having a first contouring surface ( 62a ), a second tool part ( 64 ) with a second contouring surface ( 64a ), wherein the second tool part ( 64 ) with the second contouring surface ( 64a ) opposite the first contouring surface ( 62a ) of the first tool part ( 62 ), whereby between the two contouring surfaces ( 62a . 64a ) of the tool parts ( 62 . 64 ) a cavity ( 66 ) is formed, and at least one injection port ( 68 ) for liquid matrix material ( 40 ), whose injection direction at the location of the injection port ( 68 ) along the first ( 62a ) and / or the second contouring surface ( 64a ) runs. Tool device ( 60 ) according to claim 9, characterized in that a fixing device ( 70 ) in the region of the first contouring surface ( 62a ) is provided to a reinforcing mat ( 20 ) to fix at their arranged position. Tool device ( 10 ) according to one of claims 9 or 10, characterized in that in the second tool part ( 64 ) at least one air outlet valve ( 65 ) for the cavity ( 66 ) at a position with respect to the cavity ( 66 ), in which in carrying out the method according to claims 1 to 8 in the cavity ( 6 ) no reinforcement mat ( 20 ) be inserted.

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