DE102009059676A1 - Method and device for folding one or more sheets - Google Patents

Abstract

The invention relates to a method for folding, preferably two sheets (1, 2) of a motor vehicle body. According to the invention, the following method steps are provided: placing the sheet (1) or sheets (1, 2) on the folding bed (3), swiveling a hold-down device (4) and positioning on the sheet (1, 2), moving the on a folding jaw support ( 8) arranged pre-folding surface (6) with a linear drive (12) up to a stop (16a) in the pre-folding position, pre-folding by moving the pre-folding surface (6) on the sheet (1) with a wedge element (10) by a linear drive (11) is moved relative to the jaw support (8) up to a stop (30), moving back the pre-folding surface (6) and the hold-down device (4) by moving the wedge element (10) back through the linear drive (11) and the drive (15 ), Moving the finished folding surface (7) arranged on the folding jaw support (8) with a linear drive (12) up to a stop (28) into the finished folding position, finished folding by moving the finished folding surface (7) onto the sheet (1) with the help of Wedge element ( 10), which is moved by the linear drive (11), up to a stop (30) and moving the finished folding surface (7) back by moving the linear drive (s) (11, 12) back into the basic position according to method step a). In the device, the jaw support (8) for moving the pre-folding jaws and finishing jaws (6, 7) is connected to a linear drive (11) via a wedge element (10).

Description

The invention relates to a method for folding one or more sheets, preferably for joining two sheets of a motor vehicle body, by edge-side pre-and Fertigfalzen, wherein the one or more lying on the folding bed (n) sheet (s) successively through a linear relative movement between the sheet (s) and the pre-and Fertigfalzflächen be pressed against each other and to a device, preferably for carrying out the method.

The term folding or flanging here is understood to mean the edge-side forming of a component and / or the joining of a plurality of components, preferably sheets, by pre-and Fertigfalzen. In bodywork, in particular an outer and an inner panel are connected to each other. The pre-and Fertigfalzen can on the entire circumference of a component z. As a vehicle door or on parts of a component, preferably in the area of the wheel arch of a passenger car side panel are performed.

When folding a door usually inner and outer panels are positioned on a folding bed, successively moved the pre-and Fertigfalzbacke from outside to inside to the folding position and firmly positioned there and performed the actual folding by lifting the folding bed against the folding jaws. As a drive for the movement of the folding bed, it belongs to the prior art to position a wedge drive under the folding bed, which is moved by a spindle and an electric motor drive (see. EP 1 202 827 B1 ). A working according to a similar principle folding device is in the US 5,150,508 A described, with folding stroke and the required folding force is applied by a central lying below the folding bed hydraulic cylinder.

From the DE 44 18 684 A1 is a method for connecting sheets by flanging known, wherein the parts to be joined are processed in a press in at least one pre-and Fertigbördelung and the folding stroke is achieved by lowering the press ram on the fixed lower tool. In a first forming phase, a pre-flanging by means of a Vorbördelkante a movable slide, which then moves radially outward. For the second forming phase, the crimping tool for finish crimping is subsequently moved from the outside inwards.

In the DE 199 47 518 C1 is a method for pre-and Fertigfalzen described, wherein the resting on a folding bed components are prefolded by a pivoting movement or by a linear displacement movement of the folding jaws, holding the folding jaws in the final position of the pre-folding and then the folding bed with the prefolded components for Fertigfalzen by a Lifting movement is pressed against the folding jaws. To execute the pivoting movement of the folding jaws is an electric motor drive to the prior art, which drives a four-link chain via an eccentric, to which the folding jaws are attached. The problem here is that with a rotating movement of the folding jaws it can lead to a shift of the components. This is especially true if no hold-down is available.

The invention is based on the object to propose a method and a device for folding, which dispenses with a movement of very large and heavy tools such as folding bed or press ram and a displacement of the components is avoided during the folding process.

The achievement of this object is indicated in claims 1 and 2. The dependent claims 3-10 contain useful embodiments of the device according to the invention.

The inventive method is characterized in that before the beginning of the folding process, the sheet or sheets are positioned on a fixed rebate and fixed by a hold-down and then combined with one or more linear drives, preferably horizontal and vertical movements with the aid of a wedge element be executed to successively bring the pre-and Fertigfalzbacke in position and perform by a linear, preferably vertical movement of the folding jaws the folding stroke. The linear drives preferably only execute one horizontal movement and, in the case of a relative movement between the wedge element and the folding jaw carriers, the folding jaw carrier makes the vertical movement for the folding stroke of the folding jaws. The necessary force for the folding process is applied exclusively via the wedge. The horizontal and the vertical movement for positioning the folding jaws and performing the folding stroke can be carried out according to the invention also with only one linear drive, wherein the displacement movements between the base frame, carriage, wedge element and folding jaw carrier are each controlled by stakeouts. The stakeouts ensure that a relative movement between two elements is blocked or released. The drive of the linear motor or motors is preferably carried out pneumatically. But it can also be carried out by electric motor or hydraulically.

The invention will be apparent from the attached 1 - 19 for example, explained in more detail. It show the 1 - 9 and 11 - 17 in each case schematically in section, the folding device according to the invention in different process stages. Both 1 - 9 become two linear drives 11 . 12 to move the slider 9 and the wedge element 10 needed. In the embodiment of the 11 - 17 is only a linear drive 21 intended for it.

The 1 shows the device in the normal position, in which it is possible, the lower plate 1 and the top sheet 2 on a fixed folding bed 3 hang up. The folding bed 3 is fixed to the base frame 13 respectively. 23 connected, according to 18 the base frame 13 on a working table 33 is arranged. On the folding bed 3 can either only an unfolded component, in the present case the sheet 1 or two sheets 1 . 2 successively or jointly. In this position after the 1 The finished component can also be removed from the system after folding. In the 1 are the hold down 4 in the retracted position.

In 2 is the hold-down 4 on the upper sheet 2 positioned. He was about to drive 15 and the four-link chain 5 laterally on the folding bed 3 moved on and on the sheet 2 lowered. In addition, by actuating the linear drive 12 the slider 9 moved in the direction of the arrow. This movement was through in the recess 16 protruding stakeout 17 limited, because the stakeout 17 at the stop 16a is applied. With the movement of the slider 9 are also the folding jaw carrier 8th , the wedge element 10 and the linear drive 11 in the direction of the arrow has been moved to the left, so that the folding jaw carrier 8th arranged Vorfalzfläche 6 above the right angle bent end of the sheet 1 is arranged.

For pre-folding after 3 then in addition the linear drive 11 operated and thus the wedge element 10 relative to the folding jaw carrier 8th moved to the left in the direction of the arrow. The wedge element 10 moves with the leadership 10a inside the sled 9 , The sloping sliding surfaces 10b of the sliding element 10 also move relative to the folding jaw carrier 8th to the left, so that at the same time the folding jaw carrier 8th is moved down in the arrow direction and the Vorfalzfläche 6 performs the pre-folding process. The sloping sliding surfaces 10b could also be bent down so that the movement of the jaw carrier 8th down with a movement of the linear drive 11 in the opposite direction.

To 4 then becomes the linear drive 11 moved back to its original position, with the wedge element 10 inside the folding jaw carrier 8th moved back and this moves in the direction of arrow upwards. It is also after 4 also already the linear drive 12 with the slider 9 and the stakeout 17 has been moved back to its original position in the arrow direction.

To 5 is also the stakeout 17 in the direction of the arrow from the recess 16 out and the drive 15 in the direction of the arrow has been moved back to its original position, and thus also the hold-down 4 has swung back.

For the subsequent Fertigfalzen is after 6 with the help of the linear drive 12 the slider 9 moved in the direction of arrow so far that the Fertigfalzbacken 8th with the Fertigfalzfläche 7 above the prefolded edge of the sheet 1 is arranged.

The leading edge of the slider 9 is now at the stop 28 of the base frame 13 at.

For the Fertigfalzen is after 7 the linear drive 11 operated and the wedge element 10 relative to the folding jaw carrier 8th moved in the direction of the arrow, so that the folding jaw carrier 8th in the direction of the arrow down and thus the Fertigfalzfläche 7 on the sheet 1 is completely lowered.

To 8th are the two linear drives 11 and 12 completely in their initial position and also the folding jaw carrier 8th moved back to its upper position. In this position 8th can the finished part removed and as in 1 specified a new component to be folded to be reissued.

9 shows a modified embodiment compared to 7 , wherein additionally the lower edge of the folding jaw carrier 8th on the stop 29 on the base frame 23 rests.

In 10 is the wedge element 10 with the associated linear drive 11 presented as a single part with a schematic distribution of forces. At a certain of the linear drive 11 applied force F _Z to determine the effectively applied at Fertigfalzen folding force F _F , for a given angle α from the illustrated parallelogram force the folding force FF depending on the coefficient of friction μ between wedge 10 and slider 9 or folding jaw carrier 8th be calculated in a simple manner according to the following formula: F _F = F _Z / (tan α + 2 arctan μ). The angle α between leadership 10a and sliding surfaces 10b may be 6 ° to 60 °, preferably 10 ° to 15 °. On the other hand, Fades linear drive can be easily achieved with a given force 11 and the desired folding force FF, the required angle α of the sliding surfaces 10b calculate in a simple way.

In the embodiment of the 11 - 17 is in each case only a linear drive 21 instead of the two linear drives 11 and 12 after the 1 - 9 for the movement of the slider 19 , the wedge element 10 and the jaw carrier 18 intended. Instead, there are two additional stakeouts 22 and 26 needed.

11 again shows the starting position for placing the sheets 1 and 2 on the folding bed 3 , where the hold-down 14 is still in the starting position.

To 12 is the hold-down 14 with the help of the drive 15 on the sheet 2 lowered. In addition, already with the help of the linear drive 21 the slider 19 with the wedge element 10 , the folding jaw carrier 18 in the direction of the arrow has been moved so far forward that the Vorfalzfläche 6 over the edge of the sheet 1 is arranged. The stakeout 22 is in the recess 20 to the stop 20a brought.

To 13 is the stakeout 26 from the recess 27 in the folding jaw carrier 18 moved out and after another movement of the linear actuator 21 the wedge element 10 relative to the slider 19 and the folding jaw carrier 18 so far moved that with lowering the Falzbackenträgers 18 the pre-fold surface 6 has performed the pre-folding process.

To 14 are both the linear drive 21 as well as the drive 15 moved back in their original position, so that both the jaw carrier 18 raised and lowered as well as the hold-down 14 have been moved back to its original position.

To 15 is the linear drive 21 so far moved in the direction of the arrow that the stakeout 24 in the recess 25 into the base frame 23 can be lowered. In the meantime, the stakeout was during the movement process 26 in the recess 27 drove to the folding jaw carrier 18 opposite the slider 19 to lock. To 15 is the stakeout 26 already driven back.

To 16 is the linear drive 21 yet another piece driven forward, so that the wedge element 10 relative to the slider 19 and folding jaw carrier 18 has moved further in the arrow direction and with the lowering of the folding jaw carrier 18 until the stop 30 the Fertigfalzfläche 7 is completely lowered.

To 17 is the linear drive 21 moved back so far that the folding jaw carrier 18 is raised and the stakeout 26 back into the recess 27 can be moved. After raising the stakeout 25 from the recess 24 then can the linear drive 21 Completely returned to its original position, in which case the component can be changed.

In the 18 and 19 is a perspective view of a device for pre and Fertigfalzen shown z. B. a specific area of a motor vehicle component, in the example shown a so-called. Radhaus, can fold. To 18 is on a working table 33 with tensioners 32 a partially illustrated component 31 , in the present case a side part of a car, shown. The sheet to be folded at its edge 1 lies on the folding bed 3 on and off the downholder 4 held. Suggestion are also the folding jaw carrier 8th and the four-link chain 5 for operating the hold-down 4 to see.

19 shows a different perspective view compared to 18 the device according to the invention, in particular in each case two parallel juxtaposed linear drives 11 and linear drives 12 you can see. Partial is also the lead 10a of the wedge element 10 shown. With the hold down 4 is using a four-link chain 5 and the drive 15 on the sheet 2 pressed, whereby the clamping force of the Niederhalters 4 is adjustable.

• – Durch eine kompakte Bauweise ist ein Falzen mit Niederhalter auch in engen Bereichen, wie z. B. das Radhausfalzen an einer Seitenwand eines Automobils möglich.
• – Bei kleinen Falzbereichen ergeben sich günstige Einsatzmöglichkeiten.
• – Mittels eines einzigen Linearantriebes kann eine kombinierte, horizontale und vertikale Bewegung ausgeführt werden, wobei insbesondere ein pneumatischer Antriebszylinder als Linearantrieb 11, 12, 21 verwendet werden kann. Durch die Anordnung des Keilelementes 10 wird durch die vertikale Bewegung des Falzbackenträgers 8, 18 der Krafthub beim Falzen und durch die Bewegung des Schiebers 9, 19 eine horizontale Bewegung als Positionshub ausgeführt.
• – Die relative Falzbewegung erfolgt senkrecht zur Blechebene, sodass mögliches Verschieben auf dem Falzbett 3 vermieden wird.
• – Zusätzlich verhindert der Niederhalter auch beim Vorfalzen ein Verschieben des Bauteiles.

Compared with the prior art, the method and the device for carrying out the method according to the invention have the following advantages, among others:

• - By a compact design is a folding with hold-down even in narrow areas, such. B. the Radhausfalzen on a side wall of an automobile possible.
• - For small fold areas favorable application possibilities arise.
• - By means of a single linear drive, a combined, horizontal and vertical movement can be performed, in particular a pneumatic drive cylinder as a linear drive 11 . 12 . 21 can be used. By the arrangement of the wedge element 10 is due to the vertical movement of the folding jaw carrier 8th . 18 the power stroke when folding and by the movement of the slider 9 . 19 a horizontal movement executed as a position stroke.
• - The relative folding movement is perpendicular to the sheet plane, so possible shifting on the folding bed 3 is avoided.
• - In addition, the hold-down prevents even during pre-folding a displacement of the component.

LIST OF REFERENCE NUMBERS

1

Sheet metal (up 3 supported)

2

sheet

3

Folding bed (with 13 . 23 firmly connected)

4

Hold down (over 5 With 13 . 23 articulated)

5

Four-link chain (for pivoting of 4 )

6

Vorfalzfläche

7

Fertigfalzfläche

8th

Folding jaw carrier (cf. 1 - 9 )

9

Slide (cf. 1 - 9 )

10

key member

10a

Leadership (from 10 in 9 . 19 )

10b

Sliding surfaces (from 10 in 8th . 18 )

11

Linear drive (for 10 )

12

Linear drive (for 9 )

13

Basic frame (fixed, cf. 1 - 9 )

14

Hold-down device (cf. 11 - 17 )

15

Drive (for 5 )

16

Recess (in 13 . 23 , with stop 16a For 17 , see. 1 - 9 )

16a

Attack ( 17 in 16 )

17

Stakeout (at 9 , to lock from 9 in 16 )

18

Folding jaw carrier (cf. 11 - 17 )

19

Slide (cf. 11 - 17 )

20

Recess (in 13 , For 22 with stop 20a , see. 11 - 17 )

20a

Stop (for 22 in 20 )

21

Linear drive (for 10 )

22

Stakeout (at 19 , to lock from 22 in 20 )

23

Base frame (cf. 11 - 17 )

24

Stakeout (at 19 , to lock from 24 in 25 )

25

Recess (in 13 For 24 )

26

Stakeout (at 19 , to lock from 18 in 27 )

27

Recess (in 18 )

28

Stop (for 9 . 19 at 13 . 23 )

29

Stop (at 23 For 8th for Fertigfalzen)

30

Stop (at 9 . 19 for pre-folds and Fertigfalzen)

31

Component (of a car)

32

Stretcher

33

processing table

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1202827 B1 [0003]
• US 5150508 A [0003]
• DE 4418684 A1 [0004]
• DE 19947518 C1 [0005]

Claims (10)

Method for folding one or more sheets ( 1 . 2 ), preferably for joining two sheets ( 1 . 2 ) of a motor vehicle body, by edge pre-and Fertigfalzen, the one or more on a folding bed ( 3 ) resting) sheets) ( 1 . 2 ) successively by a linear relative movement between the sheet (s) ( 1 . 2 ) and the pre-and Fertigfalzflächen ( 6 . 7 ) are pressed against one another, characterized by the following method steps: a) placing the metal sheet ( 1 ) or the sheets ( 1 . 2 ) on the folding bed ( 3 ), b) Swiveling in a hold-down ( 4 . 14 ) and positioning on the plate ( 1 . 2 ), c) shifting the on a folding jaw carrier ( 8th . 18 ) arranged Vorfalzfläche ( 6 ) with a linear drive ( 12 . 21 ) up to a stop ( 16a . 20a ) in the pre-fold position, d) pre-folding by moving the Vorfalzfläche ( 6 ) on the sheet ( 1 ) to a wedge element ( 10 ), by a linear drive ( 11 . 21 ) relative to the folding jaw carrier ( 8th . 18 ) is moved to a stop ( 30 ), e) moving back the Vorfalzfläche ( 6 ) and the hold-down ( 4 ) by moving back the wedge element ( 10 ) by the linear drive ( 11 . 21 ) and the drive ( 15 f) shifting the on the folding jaw carrier ( 8th . 18 ) arranged Fertigfalzfläche ( 7 ) with a linear drive ( 12 . 21 ) up to a stop ( 28 ) in the Fertigfalzposition, g) Fertigfalzen by moving the Fertigfalzfläche ( 7 ) on the sheet ( 1 ) with the help of the wedge element ( 10 ), of the linear drive ( 11 . 21 ) is moved to a stop ( 29 . 30 ) and h) moving back the Fertigfalzfläche ( 7 ) by moving back the linear drive or drives (s) ( 11 . 12 . 21 ) in the basic position according to process step a). Device for folding one or more sheets ( 1 . 2 ), preferably for joining two sheets ( 1 . 2 ) of a motor vehicle body by edge-side pre-and Fertigfalzen, preferably for carrying out the method, wherein on a stationary rebate bed ( 3 ) the sheet (s) (s) to be connected at the edge ( 1 . 2 ) and is positioned on a folding jaw carrier ( 8th . 18 ) arranged pre-and Fertigfalzflächen ( 6 . 7 ) successively on the sheet (s) ( 1 . 2 ) are movable, characterized in that the folding jaw carrier ( 8th . 18 ) for moving the pre-and Fertigfalzbacken ( 6 . 7 ) on the sheet (s) ( 1 . 2 ) over a wedge element ( 10 ) with a linear drive ( 11 . 21 ) connected is. Apparatus according to claim 2, characterized in that for the folding movement, a pneumatic, electromotive or hydraulic linear drive ( 11 . 21 ) is provided. Apparatus according to claim 2 or 3, characterized in that the folding jaw carrier ( 8th . 18 ) on or on a sledge ( 9 . 19 ) is arranged and with this via a linear drive ( 12 . 21 ) is movable in pre-and Fertigfalzposition. Device according to claim 4, characterized in that wedge element ( 10 ) and sledges ( 19 ) with a linear drive ( 21 ) are operable. Apparatus according to claim 4 or 5, characterized in that for the movement of the wedge element ( 10 ) a linear drive ( 11 ) and the carriage ( 9 ) another linear drive ( 12 ) is provided. Device according to one of claims 2-6, characterized in that the wedge element ( 10 ) in one piece with a guide ( 10a ) and relative to the carriage ( 9 . 19 ) and the folding jaw carrier ( 8th . 18 ) by the linear drive ( 11 . 21 ) is movable. Device according to any one of claims 2-7, characterized in that the wedge element ( 10 ) with two mutually parallel oblique sliding surfaces ( 10b ) in the folding jaw carrier ( 8th . 18 ) is guided. Apparatus according to claim 8, characterized in that the slope of the sliding surfaces ( 10b ) of the wedge element ( 10 ) at an angle of 10 ° -15 ° to the direction of movement of the guide ( 10a ) runs. Device according to one of claims 2-9, characterized in that for the forward and backward movement of the folding jaw carrier ( 8th . 18 ) relative to the sheet ( 1 . 2 ) and for the movement in pre-and Fertigfalzposition one and the same linear actuator ( 11 . 21 ) is provided.

Images