Process for the production of seat rail profiles and seat rail profile

Abstract

Method for producing seat rail profiles for vehicle seats, wherein a base sheet (2) is formed in at least one roll-forming process, wherein the base sheet (2) has a base (6) and two legs (8) which extend at the edges of the base (6) at right angles to the latter in the same direction, wherein at least one metal strip (4) is connected to a respective leg (8) of the base sheet (2), characterized in that the metal strip (4) is connected to the base sheet (2) during the roll-forming process.

Description

The invention relates to a method for producing seat rail profiles for vehicle seats according to the preamble of claims 1 and 2.Seat rail profiles for vehicle seats are generally produced from steel. In this case, a blank is punched out of a flat sheet metal and shaped to a predetermined profile shape. The length of a seat rail profile produced in this way is limited by the size of the press and of the tool in which the forming process takes place.For the production of seat rail profiles of great length, it is known to use a forming method such as roll forming, which is also referred to as rolling. In this case, a flat base sheet having a predetermined width is continuously unwound from the coil and is transformed several times by roller pairs or roller sets until the desired profile shape is achieved. The seat rail profiles are then cut to the desired length.Such a seat rail profile is known, for example, from DE 10 2009 008 500 A1. In this case, a rail profile fastened to a vehicle structure is provided, in which rail a rail fastened to a seat can be displaced by means of rolling bodies provided on the rail.DE 10 2008 036 646 A1 discloses a frame side part of a vehicle seat which is reinforced by a reinforcing body.U.S. Pat. No. 8 047 605 B2 discloses a frame structure for a vehicle seat which is reinforced by means of one or more beads.The publication DE 10 2009 008 500 A1 discloses a rail pair for a vehicle seat, wherein a roller group is arranged on one of the rails, by means of which roller group the rail is supported on the other rail.In addition, DE 28 13 635 A1 discloses a method for producing profiles, in which a plurality of metal strip-shaped strips are joined by pressure welding to form profiles.Finally, the document DE 100 13 527 A1 discloses a method for producing a steel cross member which forms a component of a bumper.The object of the invention is to specify a method for producing seat rail profiles with increased wear resistance. The invention is also based on the object of specifying a seat rail profile with increased wear resistance.This object is achieved according to the invention by a method having the features mentioned in claim 1 and by a method having the features mentioned in claim 2.According to the method according to the invention for producing seat rail profiles for vehicle seats, a base plate is formed in at least one roll forming process, wherein the base plate has a base and two limbs which extend at the edges of the base at right angles thereto in the same direction,According to the invention, it is provided that at least one metal strip is connected to a leg of the base plate, respectively, or that the legs are formed from metal strips. The metal strip allows targeted reinforcement at locations at which increased loading of the seat rail profile is to be expected.According to the invention, the metal strip is connected to the base plate during the roll forming process. In this way, a separate operation for connecting the metal strip to the base plate is saved.The metal strip preferably has a higher wear resistance than the base plate. Advantageously, the metal strip forms the raceway of the seat rail profile. A raceway is referred to as a region on which rolling bodies, in particular balls, later rest and roll. With a relatively soft and light base plate in conjunction with a wear-resistant metal strip, a rail profile can thus be produced which, on the one hand, has a relatively low weight but nevertheless a wear-resistant raceway.The object is also achieved by a rail profile having the features mentioned in claim 5, and by a rail profile having the features mentioned in claim 6.Further advantageous embodiments of the invention can be taken from the further dependent claims.The invention and advantageous embodiments of the invention are explained in more detail on the basis of the following drawings and exemplary embodiments.The following are shown: FIG. 1 shows a first exemplary embodiment of a seat rail profile according to the invention, FIG. 2 shows a second exemplary embodiment of a seat rail profile according to the invention, FIG. 3 shows a third exemplary embodiment of a seat rail profile according to the invention, FIG. 4 shows a fourth exemplary embodiment of a seat rail profile according to the invention, FIG. 5 shows a fifth exemplary embodiment of a seat rail profile according to the invention, FIG. 6 shows a sixth exemplary embodiment of a seat rail profile according to the invention, FIG. 7 shows a seventh exemplary embodiment of a seat rail profile according to the invention, and FIG. 8 shows an eighth exemplary embodiment of a seat rail profile according to the invention.FIG. 1 shows a first exemplary embodiment of a seat rail profile according to the invention.A base plate 2 is bent in a U-shape and has a base 6 and two legs 8 which extend at the edges of the base 6 at right angles to the latter in the same direction. A metal strip 4 is bonded to each of the legs 8, namely on the sides facing each other.The cross section shown here is a section perpendicular to the longitudinal direction of the seat rail profile and thus also perpendicular to the longitudinal direction of the base plate 2 and of the metal strip 4.As can be seen in the illustration, the metal strip 4 has a width which is significantly greater than its thickness. The metal strip 4 is connected with the surface, which is determined by its length and its width, to the base plate 2, in this case glued on. This means that the metal strip 4 is connected in a planar manner to the base plate 2.The bonding of the metal strip 4 to the base sheet 2 can be effected, for example, by introducing a liquid adhesive or an adhesive film, preferably adhesive on both sides.The adhesive and the adhesive film also reduce the propagation of structure-borne noise in the seat rail profile.The rail profile shown here can be produced by forming the base sheet 2 into the described U-shape in at least one roll forming process, wherein the adhesive or the adhesive film and the metal strip 4 are supplied during the roll forming process, whereby the metal strip 4 is connected to the base sheet 2.FIG. 2 shows a second exemplary embodiment of a seat rail profile according to the invention.Similar to the first embodiment, a base plate 2 is bent in a U-shape and has a base 6 and two legs 8 which extend at the edges of the base 6 at right angles thereto in the same direction. The cross section shown here is also a section perpendicular to the longitudinal direction of the seat rail profile and thus also perpendicular to the longitudinal direction of the base plate 2.At the end region facing away from the base 6, each of the legs 8 has a bend 10, which faces the respective other leg 8. The base 6 has a bend 12 in each of the regions adjacent to the legs 8.On each of the legs 8, namely on the sides facing each other, a metal strip 4 is arranged. The metal strip is fixed between a respective bend 10 and a bend 12 and is thus connected in a positive-locking manner to the base plate 2.The rail profile shown here can be produced by forming the base sheet 2 in a roll forming process in several stages into the described U-shape, wherein the metal strip 4 is fed before the formation of the bends 10 and the bends 12. By forming the bends 10 and the bends 12, the metal strip 4 is rolled or rolled into the base plate 2 and connected thereto in a positive-locking manner.Alternatively, it is also conceivable to feed the metal strip 4 after the formation of the bends 12, whereby a prefixing in one direction takes place. By the following formation of the bends 10, the metal strip 4 is then finally fixed.FIG. 3 shows a third exemplary embodiment of a seat rail profile according to the invention.Similar to the first embodiment, a base plate 2 is bent in a U-shape and has a base 6 and two legs 8 which extend at the edges of the base 6 at right angles thereto in the same direction. The cross section shown here is also a section perpendicular to the longitudinal direction of the seat rail profile and thus also perpendicular to the longitudinal direction of the base plate 2.On each of the legs 8, namely on the sides facing each other, a metal strip 4 is arranged. The metal strip is connected in a materially integral manner to the leg 8 of the base plate 2 at connecting regions 14. If the base plate 2 and the metal strip 4 consist predominantly of steel, a welded connection is conceivable. If the base plate 2 consists predominantly of aluminum, for example, and the metal strip 4 predominantly of steel, a dovetail connection is conceivable. Welding is understood to mean a joining technique which comprises elements of welding and soldering and which is used for connecting different metals to one another, for example steel with aluminum.The connecting regions 14 preferably extend in the longitudinal direction of the base sheet 2 and of the metal strip 4 at the edge regions of the metal strip 4. the connecting regions 14 are situated, for example, in the corner regions between the base 6 and the legs 8 and in the immediate vicinity of the end regions of the legs 8 facing away from the base 6.The rail profile shown here can be produced by forming the base plate 2 in a roll forming process in several steps to the described U-shape, wherein the metal strip 4 is fed during the roll forming process and connected to the base plate 2.FIG. 4 shows a fourth exemplary embodiment of a seat rail profile according to the invention.A base plate 2 has a base 6. At the edges of the base 6, two legs 8 extend at right angles to the base and together with the base 6 form a U-shape.The cross section shown here is also a section perpendicular to the longitudinal direction of the seat rail profile and thus also perpendicular to the longitudinal direction of the base plate 2.The legs 8 are formed from metal strips 4 and are connected to the base 6 at connecting regions 14. The connecting regions 14 extend in the longitudinal direction of the base sheet 2.The rail profile shown here can be produced-not according to the invention-by first connecting the base sheet 2 to the metal strips 4 to form a composite sheet. Such composite sheets are also known as semi-finished products under the term "tailored blank". In this case, the base plate 2 and the metal strips 4 are preferably welded together in butt joint. Each metal strip is thus connected at the end face to the base plate 2.Subsequently, the composite sheet metal, which contains the base sheet metal 2, is shaped in a roll forming process in such a way that the metal strips 4 at least partially form the legs 8 of the U-shaped rail profile.FIG. 5 shows a fifth exemplary embodiment of a seat rail profile according to the invention.A base plate 2 is bent in a U-shape and has a base 6 and two legs 8 which extend at the edges of the base 6 at right angles to the latter in the same direction. To each of the legs 8, namely on the sides facing each other, a metal strip 4 is connected in each case.The cross section shown here is a section perpendicular to the longitudinal direction of the seat rail profile and thus also perpendicular to the longitudinal direction of the base plate 2.The legs 8 are here made thicker in the regions adjacent to the base 6 than in the end regions facing away from the base 6. This embodiment of the legs 8 achieves an optimized bending moment profile. Bending moments are later generated on the rail profile by forces which act on the legs 8 approximately perpendicularly to the legs 8, i.e. approximately parallel to the base 6. Said forces are transmitted to the legs 8, for example, by rolling bodies. In the regions of the resulting increased load on the legs 8, the legs 8 are made thicker and thus more load-bearing.FIG. 6 shows a sixth exemplary embodiment of a seat rail profile according to the invention.A base plate 2 is bent in a U-shape and has a base 6 and two legs 8 which extend at the edges of the base 6 at right angles to the latter in the same direction. To each of the legs 8, namely on the sides facing each other, a metal strip 4 is connected in each case.The cross section shown here is a section perpendicular to the longitudinal direction of the seat rail profile and thus also perpendicular to the longitudinal direction of the base plate 2.Each of the metal strips 4 has a profile 16 on the side facing away from the leg 8. The two profiles 16 thus face each other. The profiles 16 are designed, at least predominantly, to be complementary to the shape of the rolling bodies which later roll on the metal strips 4. In the illustration shown here, balls are provided as rolling bodies and the profiles 16 are grooves which run in the longitudinal direction of the rail profile and are part-circular in cross section.The profiles 16 are preferably introduced into the metal strips 4 before they are connected to the base plate 2. The metal strips 4 are preferably work-hardened when the profiling 16 is introduced, as a result of which future wear of the raceway by the rolling bodies is reduced.FIG. 7 shows a seventh exemplary embodiment of a seat rail profile according to the invention in a perspective view.A base plate 2 is bent in a U-shape and has a base 6 and two legs 8 which extend at the edges of the base 6 at right angles to the latter in the same direction. To each of the legs 8, namely on the sides facing each other, a metal strip 4 is connected in each case.The base 6 has embossings 18 which cause an increase in the rigidity and a reduction in the weight of the rail profile. In this example, the embossings 18 run perpendicular to the longitudinal direction of the base 6 and are introduced on the side of the base 6 facing away from the legs 8. Other embodiments of embossing are also conceivable.The embossings 18 are preferably introduced into the base sheet 2 before the roll forming process takes place. However, it is also possible to introduce the embossings 18 during the roll forming process.FIG. 8 shows an eighth exemplary embodiment of a seat rail profile according to the invention.A base plate 2 is bent in a U-shape and has a base 6 and two legs 8 which extend at the edges of the base 6 at right angles to the latter in the same direction. To each of the legs 8, namely on the sides facing each other, a metal strip 4 is connected in each case. The cross section shown here is a section perpendicular to the longitudinal direction of the seat rail profile and thus also perpendicular to the longitudinal direction of the base plate 2.The legs 8 of the base plate 2 are each bent over by 180° on the side facing away from the base 6 and extend back to the base 6. Each leg 8 thus comprises a doubling 20 formed by the base plate 2.It is of course conceivable to combine individual details of the exemplary embodiments described here with one another.In the exemplary embodiments described here, the raceways for rolling bodies rolling thereon are each provided in the region of the limbs 8 of the rail profile, that is to say standing perpendicular to the base 6. Of course, one or more raceways for rolling bodies can also be provided in the region of the base 6. In this case, the at least one metal strip 4 is preferably connected to the base 6 according to one of the methods described above.List of reference characters2 Base plate 4 Metal strip 6 Base 8 Leg 10 Bent portion 12 Bend 14 Connecting region 16 Profiling 18 Embossing 20 Doubling

Claims

Method for producing seat rail profiles for vehicle seats, wherein a base plate (2) is shaped in at least one roll-forming process, wherein the base plate (2) has a base (6) and two limbs (8) which extend at the edges of the base (6) at right angles to the latter in the same direction, wherein at least one metal strip (4) is connected to in each case one limb (8) of the base plate (2), characterized in that the metal strip (4) is connected to the base plate (2) during the roll-forming process.Method for producing seat rail profiles for vehicle seats, wherein a base plate (2) is shaped in at least one roll forming process, wherein the base plate (2) has a base (6), wherein two limbs (8) extend at the edges of the base (6) at right angles thereto in the same direction, wherein the limbs (8) are formed from metal strips (4) which are each connected to the base (6) in connecting regions (14), characterized in that the metal strip (4) is connected to the base plate (2) during the roll forming process.Method according to either of Claims 1 and 2, characterized in that the metal strip (4) has a higher wear resistance than the base plate (2).Method according to one of the preceding claims, characterized in that the metal strip (4) is connected to the base plate (2) in a positively locking and / or materially integral manner.Seat rail profile for vehicle seats, comprising a base plate (2) which is formed in at least one roll forming process and has a base (6) and two limbs (8) which extend at the edges of the base (6) at right angles to the latter in the same direction, characterized in that at least one metal strip (4) is connected to in each case one limb (8) of the base plate (2), characterized in that the metal strip (4) forms a raceway for the seat rail profile.Seat rail profile for vehicle seats, comprising a base plate (2) which is formed in at least one roll forming process and has a base (6), wherein two limbs (8) extend at the edges of the base (6) at right angles thereto in the same direction, characterized in that the limbs (8) are formed from metal strips (4) which are each connected to the base (6) in connecting regions (14), characterized in that the metal strip (4) forms a raceway for the seat rail profile.Seat rail profile according to either of Claims 5 and 6, characterized in that the metal strip (4) has a higher wear resistance than the base plate (2).Seat rail profile according to one of Claims 5 to 7, characterized in that the metal strip (4) is connected to the base sheet (2) in a positively locking and / or materially integral manner.

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