EP4252931A2 - U-o-shape of a component curved around three axes - Google Patents

Abstract

The present invention relates to a method for producing a sheet metal forming component from a circuit board 1 by means of U-O forming, wherein a preform is first produced by U-forming and then final shaping to a final shape is carried out by O-forming. The invention is characterized by the following process steps: • Providing a flat board 1, • U-forming the board 1 into a U preform, • Trimming the U preform close to the final contour, • Inserting the U preform into an intermediate molding tool 1 and bending the protruding legs 8, in particular the ends 9 of the U-shape, with a packing body 13 being placed in the U-shaped preform and the legs 8 overlapping the packing body 13 in sections and being pulled out of the preform after the bending, in such a way that an elastic and optionally plastic deformation of the bent ends is created, • O-shapes of the intermediate shape 16 produced in this way.

Description

The present invention relates to a method for producing a sheet metal forming component from a circuit board using U-O molds, according to the features of claims 1 and 2.

It is known from the prior art to produce sheet metal components by forming. For this purpose, a metallic circuit board is provided, which is formed into a sheet metal forming component in a forming tool. The sheet metal forming component has a three-dimensional contour. This forming usually takes place using a press forming tool between an upper tool and a lower tool.

If a hollow profile with a closed cross-section is now to be produced, UO forming is known from the prior art. For this purpose, a flat board is first provided, this flat board is pre-formed into a U-shape and in Connection to it, formed in an O-shape to have a closed cross-section.

For example, from the CA 2,962,236 A1 such a manufacturing process is known.

The object of the present invention is, based on the prior art, to improve the shaping options for a component produced in a U-O shape that is curved about at least two spatial axes.

The aforementioned object is achieved according to the invention in a method with the features in claims 1 or 2.

Advantageous embodiments of the present invention are described in the dependent claims.

• Bereitstellen einer ebenen Platine,
• U Formen der Platine zu einer U-Vorform,
• Endkonturnahes Beschneiden der U-Vorform,
• Einlegen in ein Zwischenformwerkzeug und Anbiegen der abstehenden Schenkel, insbesondere der Enden der U-Form, wobei ein Füllkörper in der U-Vorform platziert ist und die Schenkel durch das Anbiegen den Füllkörper abschnittsweise übergreifen und wobei der Füllkörper nach dem Anbiegen aus der Vorform herausgezogen wird, dergestalt, dass eine elastische Deformation der angebogenen Enden erzeugt wird,
• O-Formen der so hergestellten Zwischenform.

The method for producing a sheet metal forming component for a circuit board using UO forming provides that a preform is first produced by U-forming and then final shaping is carried out by O-forming. According to the invention, it is characterized by the following process steps:

• Providing a flat board,
• U shapes the board into a U-shaped preform,
• Trimming of the U-shaped preform close to the final contour,
• Insertion into an intermediate mold and bending of the protruding legs, in particular the ends of the U-shape, with a filler body being placed in the U-shaped preform and the legs overlapping the filler body in sections as a result of the bending and the filler body being pulled out of the preform after the bending , in such a way that an elastic deformation of the bent ends is generated,
• O-shapes of the intermediate shape produced in this way.

• Bereitstellen einer ebenen Platine,
• Umformen der Platine auf einem Umformwerkzeug, mit einer Krümmung um eine erste Raumachse,
• Einfahren eines Umformstempels in die mit der ersten Krümmung umgeformte Platine, wobei durch den Umformstempel eine zweite Krümmung der Platine um eine zweite Raumachse erzeugt wird, welche bevorzugt im Wesentlichen orthogonal zur ersten Raumachse liegt und gleichzeitiges Herstellen einer dritten Krümmung um eine dritte Raumachse, wobei die dritte Raumachse im Wesentlichen orthogonal zur ersten Raumachse und zur zweiten Raumachse liegt, wobei durch diese beiden Verfahrensschritte eine U-Vorform erzeugt wird, wobei das Einfahren des Umformstempels die erste Krümmung an der U-Vorform erzeugt
• O-Formen der so hergestellten U-Vorform.

Alternatively or additionally, the process for producing a sheet metal component for a circuit board is carried out using RO molding with the following process steps:

• Providing a flat board,
• Forming the board on a forming tool, with a curvature around a first spatial axis,
• Insertion of a forming die into the board formed with the first curvature, with the forming die producing a second curvature of the board about a second spatial axis, which is preferably substantially orthogonal to the first spatial axis, and at the same time producing a third curvature around a third spatial axis, wherein the third spatial axis is essentially orthogonal to the first spatial axis and to the second spatial axis, a U-shaped preform being produced by these two method steps, the retraction of the forming die producing the first curvature on the U-shaped preform
• O-shapes of the U-preform produced in this way.

According to the invention, the freedom of shaping can be significantly increased due to the intermediate shaping step with the packing. In particular, the freedom of shaping can also be increased by producing a U-shape or U-preform with at least three curvatures, each curved about a spatial axis, with all three spatial axes being essentially perpendicular to one another.

In particular, the two methods described above can also be combined. In the context of the invention, this means that the U-shaped preform is first produced around three spatial axes, each with at least one curvature around one spatial axis, and this is then trimmed close to the final contour and then inserted into an intermediate molding tool.

An advantageous development according to the invention provides that when O-forming the U-shape produced in this way, the U-shape is placed on a component holder and mandrels are retracted at least on one side, preferably on both sides. The mandrels hold or fix the U-shape on the component holder. Mold jaws are then moved to the side of the U-shape. A die is lowered in the vertical direction in an overlapping and/or offset manner. Through the side molding jaws and the top-side die, an O-shaping is then carried out at least in sections, in particular completely over the length in the cross section, in such a way that a closed hollow profile is produced in the cross section. This allows two work stages to be combined into one work stage or in one tool. This concerns the lateral bending or curling of the legs of the U-shape by the mold jaws as well as the curling of the ends and thus the closing of the hollow profile in cross section. Instead of the U-shape, the intermediate shape mentioned later can also be further processed using the O-shapes described in this way.

The flat board can have a homogeneous wall thickness, but also different wall thicknesses, for example as a tailored blank.

A first curvature is created in the cross section by forming the U-shape. However, the component is preferably also curved about a second spatial axis, which lies essentially transversely to the spatial axis of the U-shape. When O-shaping begins, unintentional indentations can occur, so that a concave curvature would appear on the O-shape in a respective cross section. A part is therefore curved inwards, which, according to the invention, is avoided precisely by the intermediate molding.

The packing is thus pulled out of the preform again on the intermediate molding tool. This creates an elastic deformation of the bent legs or the bent ends. This deformation can also be partly plastic. However, the filler ensures that no inward curvature is created in the intermediate shape.

In a further forming step, O-shaping is then carried out, in particular the front sides of the ends are placed against one another. These can, for example, also be welded along the longitudinal seam. O-forming can be followed by an internal high-pressure forming process.

According to the invention, it has been found that the O-shaping is preferably carried out in two steps, whereby first the bent ends are freely bent further inwards and then the end faces of the ends come together in a further process step.

When the end faces are placed against one another, a press forming tool is preferably used, which has a closed mold cavity in cross section when closed.

For this purpose, when inserted into the O-shaped mold, the intermediate mold preferably has a maximum width that is smaller than the width of the mold cavity itself. During O-forming, the height of the intermediate mold is flattened and the width is thereby increased, so that when the mold cavity is closed, the sheet metal forming component produced by O-forming rests on all sides against the mold cavity of the O-forming tool.

Furthermore, according to the invention, the preform or the intermediate form can be produced with a cross section that varies in the longitudinal direction and/or a varying wall thickness. Precisely because the degrees of freedom of shaping are increased through intermediate molding, varying cross-sections can also be produced over the length of the component.

Circuit boards with different wall thicknesses can also be processed, so-called tailored blanks.

In a further preferred embodiment variant, the O-forming is carried out as hot forming, in particular with subsequent press hardening, so that a high tensile strength of more than 1000 MPa can be achieved in a hardenable steel alloy.

Figuren 1 bis 10

die verschiedenen Verfahrensschritte zum Herstellen des Bauteils und

Figuren 11 bis 14

eine alternative Ausführungsvariante des Verfahrens bezüglich des O-Formens.

Further advantages, features, properties and aspects of the present invention are the subject of the following description. Preferred design variants are shown in the schematic figures. These serve to make the invention easier to understand. Show it:

Figures 1 to 10

the various process steps for producing the component and

Figures 11 to 14

an alternative embodiment of the method regarding O-forming.

Figure 1a , 1b , 1c and 1d show a deep-drawing tool 2 in order to form an initially provided flat metallic circuit board 1 on a deep-drawing tool 2 for U-shaping and thus into a preform. The circuit board 1 is inserted into the deep-drawing tool 2 and a hold-down device 4 is lowered onto a die 3, shown in Figure 1b . Here, a first curvature 5 is created around a spatial axis X, so that the board 1 is preformed with an arch or a wave. Two or three curvatures could also be created, each offset in parallel around the first spatial axis X, for example according to the principle of a wave profile.

A forming die 6 then moves into the deep-drawing tool 2 and creates a second curvature 7, shown in Figure 2 about a second spatial axis Y. At the same time, however, the stamp 6 is also curved in its longitudinal direction about a third spatial axis Z. This is particularly evident in the top view according to Figure 1c . By moving the forming die 6 into the board 1, not only the second curvature 7 is generated about the second spatial axis Y, but also the first curvature 5 about the first spatial axis X is generated on the U-preform 11, and also a third curvature 29 μm a third spatial axis Z. There can also be several third curvatures around the spatial axis Z, so that also in plan view according to Figure 1c or also shown later for the U-preform according to Figure 3b a waveform is generated in top view.

The second spatial axis Y and the first spatial axis X and the third spatial axis Z preferably run transversely to one another, but they do not have to intersect. The However, spatial axes X, Y and Z can also be arranged in an angular range of 60 to 110 degrees, in particular 70 to 100 degrees, to one another. The spatial axes do not have to intersect; they can be offset from one another. If both were projected into one plane, they would run in the above-mentioned angular range or across each other.

A U-shaped preform 11 is thus created according to Figure 3a , b and c a first curvature 5 about a first spatial axis X and a second curvature 7 about a second spatial axis Y and a third curvature 29 about a third spatial axis Z. For the sake of clarity, the second spatial axis Y is shown here following the curvature 5 around the first spatial axis X. The U-preform 11 has a U-shape, the legs 8 of which are trimmed at each end 9. In particular, this trimming is carried out close to the final contour. This results in end faces 10 at the ends 9. The end faces 10 extend over the length L of the U-preform 11. The intermediate forming according to the invention now takes place, shown in Figures 4 , 5a and 5b .

The U-shaped preform 11 is placed on an anvil 12 and a packing 13 is inserted into the preform 11. The legs 8 and in particular in their end region 9 are then bent by further tool parts 14 of an intermediate molding tool 15. This is done in such a way that the ends 9 of the legs 8 are bent towards each other. They therefore overlap, at least in sections, the filler 13, shown in Figure 5a . The tool parts 14 are then opened, indicated by the dashed arrows. So that the filler 13 can now be pulled out of the intermediate mold 16 produced with it, at least one pin 17 is provided, which passes through the filler 13 and presses onto the bottom 18 of the intermediate mold 16, so that when the filler is pulled out, the legs 8 are elastically deformed outwards become what in Figure 5b is shown. A slight plastic deformation of the legs 8 can also take place.

This intermediate shaping step is then followed by O-shaping, particularly preferably in two further process steps. First, the intermediate mold 16 produced in this way is placed on another anvil 19 and with it Tool parts 20 of an O-shaped tool, the legs 8 and in particular the ends 9 of the legs 8 are bent further inwards, shown in Figure 7 . A retaining pin 21 is provided, which presses the bottom 18 of the intermediate mold onto the anvil 19, so that the legs 8 are bent further towards each other, shown in the Figures 6 and 7 .

In a further, subsequent process step of O-forming, a press forming tool 24 is then used, which has an upper tool 22 and a lower tool 23. A mold cavity 25 is according to Figure 10 with a width B25 wider than a width B16 of the intermediate mold 16 after the first process step of O-forming (cf. Figure 10 ). The press forming tool 24 is consequently closed, shown in Figure 9 . The result is a closed mold cavity. The end faces of the ends are placed against one another and a sheet metal forming part 26 with a closed cross section, also called a molded component, is produced. This lies in particular with its outer surface 27 on all sides against the inner surface 28 of the mold cavity 25.

Figures 11, 12 , 13 and 14 show an alternative embodiment variant of the method according to the invention with regard to O-shaping. Figures 11 and 12 show a cross section through the same tool at different times. Figures 13 and 14 show a respective side view and cross-sectional view of the same tool at different times. According to Figure 11 and 13 the initially produced U-shape or intermediate shape is placed on a component holder 30. The U-shape can be a U-shape produced by U-shaping or the U-preform produced according to the invention. However, it can also be the intermediate form 16, which comes with the manufacturing step in Figure 5b was produced. This intermediate form 16 then becomes a modification Figures 6 to 9 only one tool used for further O-shaping. The legs 8 are first bent towards each other in a transverse direction Q by means of lateral mold jaws 31. At a different time or at the same time, an upper die 32 begins to lower itself, so that in particular the ends 9 of the legs 8 are shaped towards one another and thereby the O-shaping, i.e. the production of a hollow profile with a closed cross section, is produced. This forming process is completed in Figure 12 and 14 , in which the manufactured Sheet metal forming component 33 is shown. So that, in particular, the intermediate shape or U-shape does not tip over after being placed on the component holder 30, mandrels 34 are retracted at the ends. This retraction of the mandrels 34 takes place for the length section partially in the longitudinal direction of the intermediate mold 16. This fixes the intermediate mold 16 during the forming process and prevents it from tipping or otherwise slipping on the component holder 30. After completing the in Figure 14 In the O-forming process shown, the mandrels 34 are then pulled out of the sheet metal forming component 33 laterally or at the end, based on the image direction, obliquely to the top left and obliquely to the top right, which is not shown in more detail.

Reference symbol:

1 -

circuit board

2 -

Deep drawing tool

3 -

die

4 -

Hold-down device

5 -

first curvature

6 -

Rubber stamp

7 -

second curvature

8th -

leg

9 -

End to 8

10 -

Front side to 9

11 -

U preform

12 -

anvil

13 -

Filling body

14 -

tool part

15 -

Intermediate molding tool

16 -

Intermediate form

17 -

Pen

18 -

Floor

19 -

anvil

20 -

tool part

21 -

retaining pin

22 -

Upper tool

23 -

sub tool

24 -

Press forming tool

25 -

Mold cavity

26 -

Sheet metal conversion molding

27 -

outer surface

28 -

Inner surface area of 25

29 -

third curvature

30 -

Component recording

31 -

mold jaw

32 -

upper die

33 -

Sheet metal forming component

34 -

Thorns

X -

first spatial axis

Y -

second spatial axis

Z -

third spatial axis

L -

length

Q -

Transverse direction

B16

Width to 16

B25

Width to 25

Claims (9)

Method for producing a sheet metal forming component from a circuit board (1) by means of UO forming, wherein a preform is first produced by U-forming and then a final shaping to a final shape is carried out by O-forming, characterized by the following process steps: • Providing a flat circuit board (1), • U-shaping the board (1) into a U-shaped preform, • Trimming of the U-shaped preform close to the final contour, • Inserting the U-shaped preform (11) into an intermediate mold (1) and bending the protruding legs (8), in particular the ends (9) of the U-shaped, with a filler (13) being placed in the U-shaped preform and the Legs (8) overlap the filler body (13) in sections and are pulled out of the preform after bending, in such a way that an elastic and optionally plastic deformation of the bent ends is generated, • O-shapes of the intermediate shape produced in this way (16). Method for producing a sheet metal forming component from a circuit board (1) by means of UO forming, wherein a preform is first produced by U-forming and then a final shaping to a final shape is carried out by O-forming, characterized by the following process steps: • Providing a flat circuit board (1), • Forming the board (1) on a forming tool, with a curvature (5) around a first spatial axis (X), • Insertion of a forming die (6) into the board (1) formed with the first curvature (5), with the forming die (6) producing a second curvature (7) of the board (1) about a second spatial axis (Y). which is preferably substantially orthogonal to the first spatial axis (X) and at the same time producing a third curvature (29) about a third spatial axis (Z), the third spatial axis being substantially orthogonal to the first spatial axis (X) and to the second spatial axis (Y ). • O-shapes of the U-preform produced in this way (11). Method according to claim 1 or 2, characterized in that O-shaping is carried out in two steps, whereby first the bent ends are freely bent further inwards and then the end faces (10) of the ends (8) come together in a further process step. Method according to one of claims 1 to 3, characterized in that when the end faces (10) are placed against one another, a press forming tool (24) is used which has a closed mold cavity (25) in cross section. Method according to one of the preceding claims, characterized in that the intermediate mold (16) has a maximum width (B16) when inserted into the O-form tool, which is smaller than the width (B25) of the mold cavity (25). Method according to one of the preceding claims, characterized in that the preform and/or the intermediate form (16) is produced with a cross section that varies in the longitudinal direction and/or a varying wall thickness. Method according to one of the preceding claims, characterized in that the maximum width (B16) of the cross section of the intermediate mold (16) is at least more than 5%, preferably more than 10%, in particular more than 15% and particularly preferably more than 20% smaller , as the maximum width (B25) of the cross section of the mold cavity (25). Method according to one of the preceding claims, characterized in that at least the O-forming is carried out as hot forming, in particular with subsequent press hardening. Method according to one of the preceding claims, characterized in that the O-shaping of the U-shaped preform (11) or the intermediate shape (16) is carried out in a tool, the U-shaped preform (11) or the intermediate shape (16) is placed on a component holder (30) and is formed into an O-shape by moving mold jaws (31) from the side and lowering a die (32) on the top side.

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