DE102008004754A1 - Joining plastic parts applied on a metallic carrier as connecting medium by induction heating, comprises inductively heating a plastic part, which is applied on flat sheet metal plate, from side opposite to side of flat sheet metal plate - Google Patents

Abstract

The method comprises inductively heating a plastic part, which is introduced in a plastic layer (2) or in the form of plastic pieces in an area-wise manner or as plastic cord on a flat sheet metal plate (1) or on a metal piece or a sheet metal plate covering a metal surface, from the side opposite to a side of the flat sheet metal plate, and bringing the plastic part superficially for melting by the induction heat. Induction coils (5) in distances to each other on the plastic layer or at the locations are introduced on the side opposite to the sheet metal plate. The method comprises inductively heating a plastic part, which is introduced in a plastic layer (2) or in the form of plastic pieces in an area-wise manner or as plastic cord on a flat sheet metal plate (1) or on a metal piece or a sheet metal plate covering a metal surface, from the side opposite to a side of the flat sheet metal plate, and bringing the plastic part superficially for melting by the induction heat. Induction coils (5) in distances to each other on the plastic layer or at the locations, at which plastic pieces or plastic cord are present, are introduced on the side opposite to the sheet metal plate to melt the plastic corresponding to the induction coils. A carpet (3), a textile layer or a sealing cord is introduced between the plastic layer and the induction coils or at the locations. An adhesive joint forms with the melted or melting plastic. The locations coated with plastic on its lower side of the plastic layer, the carpet having the plastic cord, the textile layer having a corresponding plastic element on its lower side or the sealing cord adhered with plastic on its lower side is applied on the flat sheet metal plate and is subsequently adhered by heating the plastics by the induction coils with the flat sheet metal plate. The induction coils are arranged at the lateral edges of the plastic layer. The plastic layer or the locations are joined with the sheet metal plate, carpet, textile layer or the sealing cord by pressing during or after the induction heating. The sealing cord or a sealing profile is introduced in a lower reception. A plate spot-wise coated with a meltable plastic serving as adhesive is pressed by a tool from above against the sealing cord or the sealing profile. The plastic is heated by the induction coils during pressing or after pressing. An independent claim is included for an arrangement for joining plastic parts introduced on a metallic carrier as connecting medium by induction heating.

Description

The The invention relates to a method for connecting one to a metallic one Carrier applied plastic part as a connection medium Induction heating.

In the DE-A-29 15 850 the cover of the outer edges of a caravan is described with a glued angle profile, wherein the compound is a hot melt is used. This mass is slightly heated during assembly and then connected to the edge to be covered.

On the other hand is from the DE-U1-298 18 803 a component connection of two or more components of a vehicle body is known, which is designed as a tubular frame construction. The pipes are connected to each other via plug connections. At the connection point in the overlapping and contact area, an externally activatable by energy supply connection element is arranged. The connection point is located between the components at the overlapping point and thus in an inner region of the components. In one embodiment of the component connection to be excluded by a relatively low in relation to welding heat distortion phenomena, such as occur during welding, to maintain the accuracy of fit and dimensional accuracy of the component connection. For the design of the connecting elements and its activation various possibilities are disclosed. Heat-activatable melts, in particular adhesives or solders, are particularly advantageous. It should be noted that for this only a small heat input is required, which advantageously takes place without component contact by a movable coil arrangement by means of a high-frequency AC field. This should automate the connection process. The coil should be handled by robots or other appropriately movable manipulators.

Of the Hot melt adhesive or the solder is formed by a movable coil arrangement Activator externally on the connection area between two tubular Applied components. The coil is movable as a whole and is powered by a multi-axis industrial robot or another Manipulator moved to the junction. Alternatively, you can Also, the coil assembly can be self-moving by itself consists of two or more parts that are detached from each other and be associated with each other again. In this way, z. B. open the coil ring, around the junction and then close again. The coil ring may have any shape, in particular he be circular. It can be a coil arrangement with several individual coils be provided; It can be used as a multipart workpiece be formed nachgebildeter shape inductor.

On the other hand is from the DE-A1-101 55 697 a method for positioning electrical and optical line connections known, which serve to connect at least one functional unit, such as a door control device, a light or a loudspeaker, which are mounted on a support plate of a motor vehicle door. In this case, at least some of the line connections are positioned as individual line connections on the carrier plate independently of one another, in that a plastic coating of the line element is at least partially set to the plastic state for positioning a line element of the individual line connections.

A possibility disclosed in this document, the plastic casing the conduit element or the plastic of the carrier plate to plasticize is by induction heating a metallic conductor or a metallic contact element in plastic or by induction heating of metal particles in the To heat plastic.

Known Method of applying a hot melt adhesive to a sheet metal plate use infrared radiation to intervene before the pressing process the layer forming the hot melt and the sheet metal plate to heat the glue again, then to to bond the material with very high forces, wherein Forces up to twenty tons are used. adversely This is a long process time as a result of the long warm-up phase. The materials cool during application the adhesive print already off again. Heat absorption, heat storage and temperature are dependent on structure and material.

The Heat dissipation must be due to increased pressure be balanced, or it may need to be achieved a sufficient adhesive effect such high temperatures are generated the u. U. damage to the materials, for example in the carpet or in painted parts.

It The object of the invention is a simple method of connection of plastic and metal components to create, at the same time characterized by high efficiency. The plastic components are either sheet-like, ie plastic layers or flat plastic elements, or they are plastic cords or profiles.

According to the invention this task is at egg A method of the type mentioned in the fact that a in a layer or partially in the form of plastic pieces or plastic cord applied plastic part on a first substantially planar, at least partially formed by a metal layer, in particular a metal plate, or on a piece of metal or a Metal surface covering layer is inductively heated from the opposite side of the first layer ago and the induction heat causes the plastic part at least superficially melting. The layer covering the metal surface may for example be a thin lacquer layer. "Melting" in the context of the invention also means the liquefaction of a plastic which is highly viscous or pasty in the cold state and serves as an adhesive.

By The inductive heating can be compared to a warming by infrared radiation between heat input and force application achieve considerably shorter process times for the pressing process, there is no cooling after the heating process he follows. Rather, the energy input can be through the control of the induction coils time and exact to the structure adjust the metal or sheet metal plate. The regulation of energy supply also allows more accurate litigation to avoid harmful temperature ranges. By heating of the adhesive, the process time can be further shortened. According to the invention, the sheet-like in a layer, cord-shaped as a caterpillar or punctiform applied at a plurality of locations on the planar layer Plastic either before pressing a carpet or textile layer heated or simultaneously with the application of the carpet or textile layer. On the other hand, the heating process also serve to make an adhesive bond between the flat layer and produce the plastic. In general, however, the plastic will in a first step, for example by an arrangement with Nozzles applied liquid on the flat layer and then inductively heated in a second step to an adhesive bond or a more adhesive bond with a side opposite to the flat layer arranged textile or carpet layer to achieve. It is the Adhesive plastic by heating, or the plastic is already sticky when cold, taking but by heating the fluidity of the plastic is increased so that it gets into the pores and Seams of the applied textile material flows into it and thus a particularly strong and lasting connection between the flat layer and the textile material is created.

Further Advantages of the invention can be seen in the fact that the heat input very locationally accurate, so that, for example a carpet only at certain points or in the presence of a Sealing contour only the joining area to be heated must, not the surrounding backing sheet. The same applies for attaching a sealing cord. The heat can be much faster than with conventional radiant heating can be fed, also can be otherwise poorly accessible parts or warm up areas. Because of the heat is generated in the material itself, is the heat radiation negligible.

advantageous Further developments of the invention will become apparent from the subclaims, the description and the drawings.

at The method is preferably a plurality of induction coils with helical applied windings arranged at intervals to each other are applied to the plastic, which in turn on the of the metal formed or on a metal covering Layer in the form of a layer or at specific points selectively or in the form of a plastic cord rests, according to the plastic the positions of the induction coils with the surface the metal covering layer or metal too connect.

In A further embodiment of the method provides that between the layer of plastic or in the places where there are pieces of plastic or a plastic cord, and the induction coils a second layer, in particular a carpet or a textile layer or a sealing cord or a sealing element, is introduced and this with the molten or the melting Plastic forms an adhesive bond. This is due to the warming the plastic at the same time an adhesive and firmly adhering connection between the plastic layer and the carpet or the textile layer or the sealing cord made. It is understood that with appropriate Heating the plastic also a thin textile layer completely wet and penetrate to the presence Both superimposed textile layers to glue both. The plastic is preferably here as in the other cases so-called hot melt adhesive; In any case, the invention continues a plastic that prefers a sufficient adhesion unfolded only on heating and permanent connections with neighboring Layers allows.

Alternatively, it is also on its underside already a plastic layer, plastic elements or plastic cord having carpets or corresponding plastic elements on its underside having textile layers or on its underside with a plastic pasted sealing cords on the first layer and then by heating the plastic by glue the induction coils to the first layer. The material used for the sealing cord, for example, ethylene-propylene-diene rubber (EPDM) or sponge rubber or other such plastic; a hot glue applied to the underside of the sealing cord is liquefied to bond the sealing cord to the first layer. In the case of using a sealing cord, this preferably has a microstructure with pores, which allows a partial penetration of the molten hot melt adhesive.

From Advantage is a method in which the induction coils substantially at the lateral edges of the plastic formed by the Layer or at the locations where plastic pieces or a plastic cord are located. If the plastic applied flat on the flat layer This makes them particularly suitable for strength Connect relevant points of the two layers together. Furthermore is here for the production of the adhesive bond required energy input to the required areas concentrated. Likewise also over the entire Area of the layers to be joined at intervals Induction coils are arranged, taking care wear is that in the metal-containing layer the induction coils always facing metallic areas, so that the Heat plastic in the plastic layer accordingly can and there partially made an adhesive connection becomes.

Preferably the process is realized by that of the plastic formed layer or the places where pieces of plastic or a plastic cord while, or immediately after inductive heating with the first layer, d. H. With the layer formed by the metal or covering the metal, and / or with another layer, in particular a carpet or a textile layer or a sealing cord on the induction coils opposite side is connected by pressing or be. The induction coils can be in the grout tool integrate, so that before the pressing or joining process and / or heated during the Anpressvorgangs to the to achieve desired adhesion and to bleed of the adhesive in the fabric of the carpet or textile layer to bring in.

The The invention also relates to an arrangement with an induction heater for joining at least one plastic layer or sites which are plastic pieces or a plastic cord located, with a substantially flat, at least partially formed by a metal or covering a metal Area, d. H. a first layer.

According to the invention the arrangement characterized in that the arrangement is an on the plastic layer or the places where pieces of plastic or a plastic cord located, pressable or auflegbare and a plurality of induction coils containing plate contains, after the introduction of the induction heat in the plastic layer or the places where plastic pieces or a plastic cord, and generating the adhesive Connection between the plastic layer or the places where there are pieces of plastic or a plastic cord, and the first layer and / or another layer, in particular a carpet or a textile layer, or a sealing cord of the Plastic layer or the places where plastic pieces or a plastic cord, or after pressing again is deducted. As an alternative to the further layer can also be another Component glued by the induction coil with the first layer become.

In a further embodiment of a method is provided according to the invention, that the sealing cord in a lower intake or a lower Carrier is introduced and that in places with a fusible and adhesive plastic coated Sheet metal is pressed against the sealing cord by a tool from above, the plastic during compression or heated by induction coils after being compressed becomes.

As well The invention also relates to an arrangement with a metallic one Carrier applied carpet or one on the metallic one Carrier applied textile layer or a sealing cord or a sealing profile. According to the invention, it is provided that the carpet or the textile layer or the sealing cord or the sealing profile by a layered or punctiform in places where plastic pieces or a plastic cord located, applied plastic on a substantially flat, at least partially formed by a metal or covering a metal Surface is connected by inductive heating. For the purposes of the invention may also be provided that a variety single metallic elements in a larger one Surface is integrated. Here, the plastic is preferably a hot melt adhesive or includes one from a hot melt adhesive formed layer.

According to one Embodiment of the invention contains the plastic to support and increase the inductive Effect graphite particles or metallic particles. It goes without saying that also in the carpet or the textile material or the sealing cord metallic particles or graphite particles may be included.

In the two alternatively usable arrangements in which a sealing cord is applied with a metal sheet, it is advantageous that only the immediate Joining area, d. H. the area of the depression or depression, in which the plastic layer is located and glued to the sealing cord should be heated, not the surrounding Carrier plate.

Especially The invention also relates to a carpet or a textile layer in a motor vehicle, according to a method described above is made and in particular on the back of the rear seat or rear seats, in the floor area the person cell or used as a panel in the trunk of the motor vehicle becomes. Bonded contours according to the invention are on support plates such. B. door modules, Flaps, in particular tailgates, wing doors or other functionaries.

Preferably are the induction coils used in the arrangement for bonding the Plastic layer, the plastic pieces or the sealing cords for Use come designed so that they are U-shaped cores have, whose U-legs protrude from above into the plate and in Area of the plate are surrounded by insulating bushes.

In an arrangement for heat-bonding a plastic cord it is provided that a carrier receives the plastic cord and that at least one induction coil for heating a fusible and serving as an adhesive plastic provided is. By means of a tool a sheet metal against the sealing cord, in particular a foam rubber cord, pressed and by means of the heated Plastic connected to the sheet, the sheet is the plastic opposite of the plastic cord carries. The sheet has this purpose a trough in the form of a trough-shaped Recess or groove for receiving the fusible plastic. The sheet is in turn put into a tool, the one to the recess or groove in the sheet has adapted recess or groove.

alternative are the induction coils in the tool or in the carrier intended. It is also not excluded, the induction coils both in the tool and in the carrier.

following the invention with reference to the drawings in embodiments explained in more detail. Show it:

1 a schematic side view of a pressing device for bonding a carpet with a metal layer via an adhesive layer,

2 a plan view of the pressure plate of the pressing device according to 1 .

3 a sectional view of an arrangement with a sheet-carrying tool for bonding a sealing cord to the sheet, wherein the sealing cord is received by a carrier and induction coils for heating an adhesive are integrated in the carrier, and

4 a sectional view as in 3 with the difference that the induction coils are arranged above the adhesive carrying the groove in a groove in the tool.

On a carrier sheet 1 ( 1 ) becomes a meltable and in the molten state an adhesive permanent compound generating plastic layer 2 applied. Above the plastic layer 2 lies a layer 3 , which may be formed for example by a carpet or other textile material or another plastic material.

The layer 3 is by means of a pressure plate 4 against the carrier sheet 1 pressed. In this case, a contact pressure F is used, which generates, for example, a surface pressure in the range between 0.1 to 2 MPa in the plastic layer. In the pressure plate 4 is a variety of induction coils 5 integrated. The spools 5 each have a U-shape with two U-legs 6 . 7 and a center piece 8th on.

The middle piece 8th is with a current-carrying winding 9 wound. When applying a low-frequency alternating electrical current to the winding 9 is in a metal, thus also in the carrier sheet 1 , produced by the eddy current losses heating. By introducing metal chips or other metallic particles into the plastic layer 2 or the layer 3 the inductive effect can be increased even more. If the pressure plate 4 is made of a metal, around which in the pressure plate 4 reaching in thigh 6 . 7 the induction coils 5 Insulating 10 . 11 arranged.

A plurality of induction coils 5 can along edges 12 . 13 ( 2 ) of the carrier sheet 1 and the layers 2 . 3 be arranged in areas there is a bond between the carrier plate and the layer 3 to reach.

In another variant of the invention it is provided that arrangement 14 ( 3 ) a carrier 15 for receiving a sealing profile or a sealing cord 16 in a hollow 17 in the carrier 15 is incorporated comprises. Below the trough 17 are, much like in 1 shown, induction coils 5 provided that serve as a hot melt adhesive melt the plastic as a layer 18 from a hollow or recess 19 in a tin 20 is recorded. The sheet 20 is in one of a lower tool 21 and an upper tool 22 included existing tool.

In a further embodiment ( 4 ) an arrangement for bonding a sealing profile 16 with a tin 20 is alternative to the in 3 illustrated upper tool 22 an upper tool 22 ' designed so that it is in the area of the trough 19 in the tin 20 an induction coil surrounding the trough from its top 5 has, which induces a current in the adjacent sheet and thus the plastic of the layer 18 melts. In this case, in the carrier 15 no induction coils 5 available, although they can also be provided there.

1

support plate

2

Plastic layer

3

layer

4

pressure plate

5

induction coil

6

leg

7

leg

8th

centerpiece

9

winding

10

insulating bush

11

insulating bush

12

edge

13

edge

14

arrangement

15

carrier

16

sealing profile

17

trough

18

layer

19

trough

20

sheet

21

lower tool

22

Upper tool ( 3 )

22 '

Upper tool ( 4 )

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 2915850 A [0002]
• - DE 29818803 U1 [0003]
• - DE 10155697 A1 [0005]

Claims (16)

A method of connecting an applied on a metallic support the plastic part as a connection medium by induction heating, characterized in that (in a layer 2 ) or partially in the form of plastic pieces or plastic cord applied plastic part on a first substantially planar, at least partially formed by a metal layer ( 1 ), in particular a sheet metal plate, or on a metal pieces or a metal surface covering layer ( 1 ), inductively from that of the first layer ( 1 ) is heated opposite side and the induction heat brings the plastic part at least superficially to melt. Method according to claim 1, characterized in that a plurality of induction coils ( 5 ) at intervals to each other on the layer ( 2 ) of plastic or, where there are pieces of plastic or a plastic cord, on the first layer ( 1 ) is applied to the plastic according to the position of the induction coils ( 5 ) to melt. Method according to claim 1 or 2, characterized in that between the layer ( 2 ) made of plastic or at the points where there are plastic pieces or a plastic cord, and the induction coils ( 5 ) a second layer, in particular a carpet ( 3 ) or a textile layer, or a sealing cord is introduced and this forms an adhesive bond with the molten or the melting plastic. A method according to claim 1 or 2, characterized in that on its underside a plastic layer, coated with plastic bodies or a plastic cord having carpet or a corresponding plastic elements on its underside having textile layer or a pasted on its underside with a plastic sealing cord on the first layer ( 1 ) and then by heating the plastic by the induction coils ( 5 ) with the first layer ( 1 ) are glued. Method according to one of claims 1 to 4, characterized in that the induction coils ( 5 ) substantially at the lateral edges ( 12 . 13 ) of the layer formed by the plastic ( 2 ) or at the locations where plastic pieces or a plastic cord are located. Method according to one of claims 1 to 5, characterized in that the layer formed by the plastic ( 2 ) or the locations where plastic pieces or a plastic cord are located, during or after the inductive heating with the first layer and / or with a second layer, in particular a carpet ( 3 ) or a textile layer, or a sealing cord is connected by pressing or be. Arrangement with an induction heater for connecting at least one layer formed by a plastic ( 2 . 18 ) or of locations where there are plastic pieces or a plastic cord, with a substantially planar, at least partially formed by a metal or a metal covering first layer ( 1 ), characterized in that the arrangement a on the plastic layer ( 2 . 18 ) or the places where there are plastic pieces or a plastic cord, aufdrückbare and a plurality of induction coils ( 5 ) containing plate ( 4 ), which after introduction of the induction heat into the plastic layer ( 2 . 18 ) or the locations where there are plastic pieces or a plastic cord, and the production of the adhesive bond between the plastic layer ( 2 ) or the locations where plastic pieces or a plastic cord are located, and the first layer ( 1 ) and / or a component and / or another layer, in particular a carpet ( 3 ) or a textile layer, or a sealing cord or a sealing profile ( 16 ) of the plastic layer ( 2 . 18 ) or the places where there are plastic pieces or a plastic cord, or after pressing off is removable. A method according to claim 7, characterized in that the sealing cord or the sealing profile ( 16 ) into a lower receptacle ( 15 ) and that in places with a fusible and serving as an adhesive plastic ( 18 ) coated sheet ( 20 ) by a tool ( 21 . 22 . 22 ' ) from above against the sealing cord or the sealing profile ( 16 ) is pressed, the plastic ( 18 ) during compression or after compression by induction coils ( 5 ) is heated. Arrangement with a carpet ( 3 ) or a textile layer or a sealing cord or a sealing profile ( 16 ), characterized in that the carpet ( 3 ) or the textile layer or the sealing cord or the sealing profile ( 16 ) through a plastic layer ( 2 . 18 ) or at locations where there are plastic pieces or a plastic cord, with a substantially flat, at least partially formed by a metal layer ( 1 ), in particular a sheet metal plate, or on a metal pieces or a metal surface covering layer ( 1 ), is connected by inductive heating. Arrangement according to claim 9, characterized in that the plastic is a hot melt adhesive or at least one layer formed by a hot-melt adhesive ( 2 ). Arrangement according to claim 9 or 10, characterized that the plastic contains graphite particles or metallic particles. Arrangement in a motor vehicle manufactured according to a method according to any one of the claims 1 to 6 or with the features of claims 9 to 11, especially on the back of the back seat, in the Floor area of the cell or as a lining in the trunk of the motor vehicle. Arrangement for carrying out the method according to claim 2, characterized in that the induction coils ( 5 ) Have U-shape and from above into the plate ( 4 protrude) and in the area of the plate ( 4 ) of insulating bushes ( 10 . 11 ) are surrounded. Arrangement for carrying out the method according to claim 8, characterized in that a carrier ( 15 ) a sealing cord ( 16 ), in particular a sponge rubber cord, or a sealing profile ( 16 ) receives that at least one induction coil ( 5 ) is provided for heating a fusible and serving as an adhesive plastic and that by means of a tool ( 21 . 22 . 22 ' ) a sheet ( 20 ) against the sealing cord or the sealing profile ( 16 ) and by means of the heated plastic ( 18 ) is connectable with this, wherein the sheet the plastic ( 18 ) opposite of the sealing cord or the sealing profile ( 16 ) wearing. Arrangement according to claim 14, characterized in that at least one induction coil ( 5 ) in the carrier ( 15 ) or in the tool ( 21 . 22 . 22 ' ) is integrated. Arrangement according to claim 14 or 15, characterized in that the tool ( 21 . 22 . 22 ' ) a trough-shaped recess or groove for receiving a with a corresponding recess ( 19 ) or groove-equipped sheet ( 20 ) and that the sheet ( 20 ) in the recess ( 19 ) or the groove receives the fusible plastic.