WO2011072781A2

WO2011072781A2 - Method and device for folding one of more metal sheets

Info

Publication number: WO2011072781A2
Application number: PCT/EP2010/006883
Authority: WO
Inventors: Martin Buchheit; Marco Backes
Original assignee: Thyssenkrupp Drauz Nothelfer Gmbh
Priority date: 2009-12-19
Filing date: 2010-11-11
Publication date: 2011-06-23
Also published as: DE102009059676B4; DE102009059676A1; WO2011072781A3

Abstract

The invention relates to a method for folding preferably two metal sheets (1, 2) of a motor vehicle body. According to the invention, the following method steps are provided: placing the metal sheet (1) or metal sheets (1, 2) on the fold bed (3), swivelling in and positioning a holding-down device (4) on the metal sheet (1, 2), sliding the prefold surface (6) disposed on a folding jaw support (8) as far as a stop (16a) into the prefold position by means of a linear drive (12), prefolding by moving the prefold surface (6) onto the metal sheet (1) using a wedge element (10), which is moved by a linear drive (11) relative to the folding jaw support (8), as far as a stop (30), moving the prefold surface (6) and the holding-down device (4) back by moving the wedge element (10) back using the linear drive (11) and the drive (15), sliding the finishing fold surface (7) disposed on the folding jaw support (8) as far as a stop (28) into the finishing fold position by means of a linear drive (12), finish-folding by moving the finishing fold surface (7) onto the metal sheet (1) with the aid of the wedge element (10), which is moved by the linear drive (11), as far a stop (30) and moving the finishing fold surface (7) back by moving the linear drive(s) (11, 12) back into the starting position according to method step a). In the device, the folding jaw support (8) for moving the prefold and finishing fold 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 or on The sheet (s) resting on the folding bed are successively pressed against one another by a linear relative movement between the sheet (s) and the pre-and Fertigfalzflächen and on 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. B. a vehicle door or on parts of a component, preferably in the area of the wheel arch of a passenger car side part 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 fixed there 'positioned and the actual folding performed 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 Bl). A folding device operating on a similar principle is described in US Pat. No. 5,150,508 A, in which folding stroke and the required folding force are applied through a central hydraulic cylinder lying below the folding bed.

From DE 44 18 684 AI discloses 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 Lowering of the press ram is achieved 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 DE 199 47 518 Cl a method for pre and Fertigfalzen is 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, the folding jaws held in the final position of the pre-folding and then with the folding bed the vorgegefalzten components for Fertigfalzen is pressed by a lifting movement 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 au a movement of very large and heavy tools such as folding bed or press die is waived and a shift 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 by a linear, preferably vertical movement of the folding jaws the folding stroke perform. 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 explained in more detail with reference to the accompanying Figs. 1 - 19, for example. FIGS. 1 to 9 and 11 to 17 each schematically show, in section, the folding device according to the invention in different process stages. In FIGS. 1-9, two linear drives 11, 12 are required for moving the slider 9 and the wedge element 10. In the embodiment according to FIGS. 11-17, only one linear drive 21 is provided for this purpose.

Fig. 1 shows the device in the normal position, in which it is possible to hang the lower plate 1 and the upper plate 2 on a stationary folding bed 3. The folding bed 3 is fixedly connected to the base frame 13 and 23, wherein according to FIG. 18, the base frame 13 is arranged on a processing table 33. On the folding bed 3 either only an unfolded component, in the present case the sheet 1 or two sheets 1, 2 can be placed successively or together. In this position according to FIG. 1, the finished component can also be removed from the system after folding. In Fig. 1, the hold-4 are in the zurückgeschwenkten position.

In Fig. 2, the hold-down 4 is positioned on the upper sheet 2. For this purpose, he was moved over the drive 15 and the four-bar chain 5 laterally on the folding bed 3 and lowered onto the plate 2. In addition, by pressing the Linear actuator 12 of the slider 9 has been moved in the arrow direction. This movement was limited by the protruding into the recess 16 staking 17, because the stake 17 rests against the stop 16a. With the movement of the slide 9 and the folding jaw carrier 8, the wedge member 10 and the linear actuator 11 have been moved in the direction of arrow to the left, so that arranged on Falzbackenträger 8 Vorfalzfläche 6 is disposed above the right angle bent upward end of the sheet 1.

For the pre-folding of FIG. 3, the linear drive 11 is then additionally actuated, and thus the wedge element 10 is moved relative to the folding jaw carrier 8 in the direction of the arrow to the left. The wedge element 10 thereby moves with the guide 10a within the carriage 9. The inclined sliding surfaces 10b of the sliding element 10 also move relative to the folding jaw carrier 8 to the left, so that at the same time the folding jaw carrier 8 is moved in the arrow direction down and the Vorfalzfläche 6 performs the Vorfalzvorgang , The inclined sliding surfaces 10b could also be bent downwards, so that the movement of the folding jaw carrier 8 downward would result in a movement of the linear drive 11 in the opposite direction. According to Fig. 4, the linear drive 11 is then moved back to its original position, wherein the wedge member 10 moves back within the Falzbackenträgers 8 and moves it in the direction of arrow upwards. In addition, according to FIG. 4, the linear drive 12 with the slider 9 and the stake 17 has already been moved back to its starting position in the direction of the arrow.

According to FIG. 5, the stake 17 has additionally been moved back out of the recess 16 in the direction of the arrow and the drive 15 has been moved back into its starting position in the direction of the arrow, whereby the hold-down 4 is also swung back.

For the subsequent Fertigfalzen is shown in FIG. 6 by means of the linear drive 12, the slider 9 in the arrow direction moved so far that the Fertigfalzbacken 8 is arranged with the Fertigfalzfläche 7 on the prefolded edge of the sheet 1. The front edge of the slider 9 is now on the stop 28 of the base frame 13 at.

For the Fertigfalzen 7 of the linear actuator 11 is actuated and the wedge member 10 moves relative to the Falzbackenträger 8 in the arrow direction, so that the Falzbackenträger 8 in the direction of arrow down and thus the Fertigfalzfläche 7 is completely lowered to the sheet 1 of FIG.

According to Fig. 8, the two linear actuators 11 and 12 have been completely moved back to its upper position in its initial position and also the folding jaw carrier 8. In this position according to FIG. 8, the finished component can be removed and, as indicated in FIG. 1, a new component to be folded can be placed again.

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

In Fig. 10, the wedge member 10 is shown with the associated linear drive 11 as a single part with a schematic distribution of forces. To determine the effective force exerted upon Fertigfalzen crimping force F _F at a certain pressure exerted by the linear drive 11 the force F _z can at a given angle α from the illustrated of forces the crimping force F _F depending on the coefficient of friction μ between the wedge 10 and the slide 9 and folding jaw 8 be calculated in a simple manner according to the following formula: F _F = F _z / (tan α + 2 arctan μ). The angle α between guide 10a and sliding surfaces 10b may be 6 ° to 60 °, preferably 10 ° to 15 °. On the other hand, it is a simple way for a given force F _z of the linear drive 11 and the desired crimping force F _F, the required angle α of the sliding surfaces 10b calculated in a simple manner.

In the embodiment according to FIGS. 11-17, only one linear drive 21 is provided instead of the two linear drives 11 and 12 according to FIGS. 1-9 for the movement of the slide 19, the wedge element 10 and the folding jaw carrier 18. Instead, two additional stakeouts 22 and 26 are needed. Fig. 11 again shows the starting position for placing the sheets 1 and 2 on the folding bed 3, wherein the hold-down 14 is still in the starting position.

According to Fig. 12, the hold-down 14 is lowered by means of the drive 15 to the sheet 2. In addition, with the help of the linear drive 21, the slide 19 with the wedge element 10, the folding jaw carrier 18 has already been moved forward in the direction of the arrow so far that the prefolding surface 6 is arranged above the edge of the metal sheet 1. The stakeout 22 is brought in the recess 20 to the stop 20 a.

According to FIG. 13, the stake 26 has been moved out of the recess 27 into the folding jaw carrier 18 and, after further movement of the linear drive 21, the wedge element 10 has been moved relative to the slider 19 and the folding jaw carrier 18 so far that with lowering of the folding jaw carrier 18 the pre-folding surface 6 has performed the pre-folding process.

According to Fig. 14, both the ünearantrieb 21 and the drive 15 are returned to their original position, so that both the folding jaw carrier 18 is raised and. moved back as, and the hold-down 14 have been moved back to its original position.

According to FIG. 15, the linear drive 21 has been moved so far in the direction of the arrow that the stake 24 can be lowered into the recess 25 in the base frame 23. In the meantime, the stakeout 26 had moved into the recess 27 during the movement process in order to lock the folding jaw carrier 18 with respect to the slide 19. According to Fig. 15, the stakeout 26 has already been reduced again.

According to FIG. 16, the linear drive 21 has moved forward a further distance, so that the wedge element 10 has moved further in the direction of the arrow relative to the slide 19 and folding jaw carrier 18 and the finished fold surface 7 is completely lowered with the lowering of the folding jaw carrier 18 up to the stop 30. According to FIG. 17, the linear drive 21 has moved back far enough that the folding jaw carrier 18 is raised and the stake 26 can be moved back into the recess 27. After raising the stakeout 25 from the recess 24 then the linear drive 21 can be completely moved back to its original position, in which case the component can be changed.

In Figs. 18 and 19, a device for pre-and Fertigfalzen is shown in perspective, the z. B. a specific area of a motor vehicle component, in the example shown a so-called. Radhaus, can fold. According to FIG. 18, a component 31, only partially shown, on a processing table 33 with tensioners 32 is shown, in the present case a side part of a passenger car. The sheet 1 to be folded at its edge rests on the folding bed 3 and is held by the hold-down 4. Andeutungsweise are also the folding jaw carrier 8 and the four-bar chain 5 to operate the hold-4 to see.

FIG. 19 shows another perspective view in comparison to FIG. 18 of the device according to the invention, with two linear drives 11 and linear drives 12 arranged parallel to each other in particular being visible in each case. Partially, the guide 10a of the wedge element 10 is also shown. With the hold-down 4 is pressed by means of a four-bar chain 5 and the drive 15 to the sheet 2, wherein the clamping force of the hold-4 is adjustable.

Compared to the prior art, in the method according to the invention or the device for carrying out the method, u. a. the following advantages:

- 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 can be used as a linear drive 11, 12, 21. The arrangement of the wedge element 10 is carried out by the vertical movement of the folding jaw carrier 8, 18 of the power stroke during folding and by the movement of the slider 9, 19, a horizontal movement as a position. - The relative folding movement is perpendicular to the sheet plane, so that 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 plate (resting on 3)

2 sheet metal

Folding bed (fixed to 13, 23)

4 hold-downs (over 5 with 13, 23 hinged)

5 four-link chain (for panning 4)

Vorfalzfläche

Fertigfalzfläche

Folding jaw carrier (see Fig. 1 - 9)

Slide (see Fig. 1 - 9)

10 wedge element

0a leadership (from 10 in 9, 19)

0b sliding surfaces (from 10 in 8, 18)

1 linear drive (for 10)

2 linear drive (for 9)

3 base frame (fixed, see Fig. 1 - 9)

4 hold-down devices (compare Fig. 11 - 17)

5 drive (for 5)

6 recess (in 13, 23, with stop 16a for 17, see Fig. 1 - 9) 6a stop (17 in 16)

7 stake out (at 9, to lock 9 in 16)

8 folding jaw carrier (see Fig. 11 - 17)

9 slides (see Fig. 11 - 17)

0 recess (in 13, for 22 with stop 20a, see Fig. 11 - 17) 0a stop (for 22 in 20)

1 linear drive (for 10)

2 stake out (at 19, to lock 22 in 20)

3 base frame (see Fig. 11 - 17)

4 stake out (at 19, to lock 24 in 25)

5 recess (in 13 for 24)

6 stake out (at 19, to lock 18 in 27)

7 recess (in 18)

8 stop (for 9, 19 at 13, 23) Stop (at 23 for 8 for Fertigfalzen)

Stop (at 9, 19 for pre-folds and Fertigfalzen) component (of a car)

Stretcher

processing table

Claims

claims

A 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, wherein the or on a folding bed (3) resting (n ) Sheet metal (s) (1, 2) are successively pressed against each other by a linear relative movement between the sheet (s) (1, 2) and the pre-and Fertigfalzflächen (6, 7), characterized by the following method steps:

a) placing the sheet metal (1) or the sheets (1, 2) on the folding bed (3), b) pivoting in a holding-down device (4, 14) and positioning on the sheet metal (1, 2),

c) displacing the prefolding surface (6) arranged on a folding jaw carrier (8, 18) with a linear drive (12, 21) as far as a stop (16a, 20a) in the prefolding position,

d) Pre-folding by moving the Vorfalzfläche (6) on the sheet (1) with a wedge member (10) by a linear drive (11, 21) relative to the Falzbackenträger (8, 18) is moved to a stop (30 e) moving back the pre-fold surface (6) and the hold-down (4) by moving the wedge element (10) back through the linear drive (11, 21) and the drive (15),

f) displacement of the folding jaw carrier (8, 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) by means of the wedge element (10) which is moved by the linear drive (11, 21), to a stop (29, 30) and

h) moving back the Fertigfalzfläche (7) by moving back or the linear drives (s) (11, 12, 21) in the basic position according to step a).

2. Device for folding one or more sheets (1, 2), preferably for connecting two sheets (1, 2) of a motor vehicle body by edge-side pre-and Fertigfalzen, preferably for performing of the method, wherein on a stationary folding bed (3) or the edge side to be joined (s) sheet (s) (1, 2) is or are positioned and arranged on a folding jaw carrier (8, 18) pre-and Fertigfalzflächen ( 6, 7) successively on the one or more sheets (1, 2) are movable, characterized in that the folding jaw carrier (8, 18) for moving the pre-and Fertigfalzbacken (6, 7) on the one or more sheets (1, 2) is connected via a wedge element (10) with a linear drive (11, 21).

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 (8, 18) on or on a carriage (9, 19) is arranged and with this via a linear drive (12, 21) in the pre-and Fertigfalzposition is movable.

Apparatus according to claim 4, characterized in that the wedge element (10) and slide (19) with a linear drive (21) are actuated.

Apparatus according to claim 4 or 5, characterized in that a further linear drive (12) is provided for the movement of the wedge element (10), a linear drive (11) and the carriage (9).

Device according to one of claims 2-6, characterized in that the wedge element (10) is integrally connected to a guide (10a) and relative to the carriage (9, 19) and the folding jaw carrier (8, 18) by the linear drive (11, 21) is movable.

Apparatus according to claim 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 (8, 18) is guided.

9. 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).

10. Device according to one of claims 2-9, characterized in that for the forward and backward movement of the Falzbackenträgers (8, 18) relative to the sheet (1, 2) and for the movement in pre and Fertigfalzposition one and the same linear drive ( 11, 21) is provided.