DE102009053534B4 - Device and method for forming and / or tempering sheet metal components and sheet metal part produced therewith - Google Patents

Abstract

Device (2) for reshaping and / or tempering sheet metal components (11) which are formed from at least two sheet metal parts (11 ', 11 ") which are connected via a connecting seam (11s), the area of the connecting seam (11s) being Transition area (Ü) is characterized in that the device (2) has a tool (14) which is designed for reshaping and / or tempering the transition area (Ü) by having a shaped surface which corresponds to the changed shape of the transition area ( Ü) after reshaping and / or tempering, taking into account the change in shape, corresponds to at least one area adjacent to the transition area (Ü), it being provided that the tool has a first part tool (14) and a second part tool (12), whereby the first part tool (14) is designed for forming and / or tempering the transition region (Ü) and the second part tool (12) for forming and / or tempering e It is formed in the area adjoining the transition region (Ü) and the first part tool (14) is designed to be movable in the forming direction relatively and / or independently of other part tools.

Description

The invention relates to a device according to the preamble of claims 1 and 2 and a method according to the preamble of claims 6 and 7 for forming and / or tempering sheet metal components and sheet metal parts produced therewith.

It is known to produce sheet metal components from sheet metal welded to one another by forming, preferably hot forming. Such sheet metal blanks welded together are also referred to as tailored welded blanks. It is also known to produce sheet metal components by forming from cold-rolled sheet metal strip with sections of different thicknesses. The cold-rolled sheet metal strip of different thicknesses is also referred to as tailored rolled blank.

The document DE 44 45 856 C1 describes a tool for reworking by reshaping at least two sheets of different thickness connected by a sock weld to form a circuit board. This document is directed to eliminating the step on the outside between the two sheets.

The document JP 2000 024 724 A. describes a method for reworking the connecting section of two sheet metal parts joined together by laser welding by means of a pressing tool. The transition area between the two sheet metal parts is formed by a tool.

In the DE 100 41 281 A1 describes an apparatus and a method for forming blanks from flexible rolled metal strip. The metal strip has two sections with different thicknesses. During the deep-drawing of the sheet metal component, this transition area is formed in such a way that one side of the formed sheet metal component is flat and the other side is formed with a thickness transition.

In the DE 10 2007 047 314 A1 describes a press tool for hot forming and / or press hardening of workpieces made of sheet metal. However, the document mentioned does not take into account the fact that in the transition areas between the different sheet thicknesses during forming, in particular when forming with a large degree of forming, material shifts in the transition area between the thinner and the thicker material can occur due to the different material thicknesses and the associated different stresses the form fit between the tool and sheet metal component can be interrupted in some areas. This means that no heat treatment can be carried out there after the forming.

It is also possible that shifts from thicker material to thinner material occur during the forming process, which can lead to the weld seam being torn open.

For these reasons, forming tools are left out in the designated transition area or the surface of the press ram is reset, from which it follows that adequate compensation is not possible in the transition area. The strength and / or hardness of the formed sheet metal component are consequently reduced in the transition area.

The object of the present invention is to provide an improved device and an improved method for forming and / or tempering sheet metal components.

According to the invention, this object is achieved with the subject matter of claim 1. A device for forming and / or tempering sheet metal components is proposed which is formed from at least two sheet metal parts which are connected via a connecting seam, the area of the connecting seam being designed as a transition area, the device being provided with a tool, which is designed for reshaping and / or tempering the transition region by forming a mold surface which corresponds to the changed shape of the transition area after reshaping and / or tempering, taking into account the change in shape of at least one area adjacent to the transition area,
being provided
that the tool has a first sub-tool and a second sub-tool, the first sub-tool being designed for reshaping and / or tempering the transition region and the second sub-tool being designed for reshaping and / or quenching an area adjacent to the transition region, and the first sub-tool in Forming direction is designed to be movable relatively and / or independently of other part tools.

The object is also achieved with the subject matter of claim 2. A device for forming and / or tempering sheet metal components is proposed which has at least one sheet metal component which has two sections of different thickness or different material properties, the connection area between these sections being designed as a transition area,
being provided
that the device has a tool which is designed for shaping and / or tempering the transition area by having a shaped surface which corresponds to the changed shape of the transition area after shaping and / or tempering, taking into account the change in shape design of at least one of the transition area adjacent area,
being provided
that the tool has a first sub-tool and a second sub-tool, the first sub-tool being designed for reshaping and / or tempering the transition region and the second sub-tool being designed for reshaping and / or quenching an area adjacent to the transition region and the first sub-tool in Forming direction is designed to be movable relatively and / or independently of other part tools.

The area of the connecting seam, which is designed as a transition area, is the connecting seam itself and preferably also a directly adjacent area on both sides of the connecting seam. The connection area between two sections of different thickness or different material properties, which is designed as a transition area, is the area in which the thickness or the material properties changes, including the close areas immediately adjacent to it on both sides.

The device according to the invention has a tool which is specially matched to the transition region, the change in shape design during forming also being taken into account.

The tool can advantageously be designed on the basis of pattern reshaping in order to optimize the position and shape of the molding surface in accordance with the reshaping parameters, such as, for example, reshaping temperature and depth of draw.

The tempering processes, which can also be referred to as heat treatment processes, include press hardening and form hardening. In practice, hot forming is also understood as a tempering process, because tempering of the material can be associated in particular with the controlled cooling of the formed sheet metal component.

The tools can be divided into a first and a second part tool for the upper tool. The lower tool can be designed as a common tool. Alternatively, however, the lower tool can also be divided accordingly and the upper tool can be designed as a common tool. It is also possible to divide both the upper and the lower tool into several sub-tools.

It can further be provided that the tool has a first part tool for reshaping and / or tempering the transition area and a second part tool for reshaping and / or tempering the area adjoining the transition area on a first side and a third part tool for reshaping and / or tempering one has a region adjacent to the transition region on a second side, the first side and the second side being formed on sides of the transition region facing away from one another.

It is provided that the first part tool is designed to be movable in the forming direction relatively and / or independently of other part tools. The first sub-tool can preferably be a stamp which interacts with a die arranged under the die, the transition region of the sheet metal component being arranged between the die and the die. However, it can also be provided that the portion of the die arranged under the punch is designed to be movable and the punch is not movable or that both the punch and the die are designed to be movable. The movement of the sub-tools mentioned can take place, for example, by means of hydraulic actuating cylinders or the like.

It can further be provided that the first tool part has height-offset mold surfaces. The height offset can correspond to the height offset of the surface of the sheet metal component in the transition area. However, it is also possible to choose a different height offset in order to carry out a special reshaping in the transition area.

It can further be provided that the height of the shaped surfaces is adjustable. It can further be provided that one or more of the shaped surfaces are adjusted so that they come into contact with the surface of the sheet metal component without any significant force, preferably if the transition area is only to be tempered. For example, force-limiting elements can be provided, which can be designed as spring elements, for example.

The object is further achieved with the subject matter of method claim 6. It is a method for forming and / or tempering sheet metal components, the sheet metal components being formed from at least two sheet metal parts which are connected via a connecting seam, the region of the connecting seam being The transition area is formed using a device of the type described above, it being provided that the reshaping and / or tempering of the transition area and the reshaping and / or tempering of the area adjacent to the transition area take place in separate steps which take place successively in time.

The object is also achieved with the subject matter of method claim 7. It is a method for forming and / or tempering sheet metal components that have at least one sheet metal component that has two sections of different thickness or material properties, the connection area between these sections being designed as a transition area using a device of the type described above, wherein is provided,
that the shaping and / or tempering of the transition area and the shaping and / or tempering of the area adjoining the transition area take place in separate steps, which take place successively in time.

By performing the forming and / or tempering separately in the transition area and outside the transition area, it is possible to provide optimal process parameters for each of the areas.

It can be provided that the transition area is reshaped and / or tempered after or shortly before the shaping of the sheet metal component is completed.

It can further be provided that the transition region is hot-formed. Hot forming can be followed directly by tempering, which, by controlled cooling of the transition area, can lead to the intended structural change to improve the strength and / or hardness in the transition area.

It can further be provided that an already formed sheet metal component is inserted into the device and the transition area is tempered.

It can further be provided that the sheet metal component is cold formed. It can therefore be provided, for example, to cold-shape the sheet metal component and then to temper the transition area of the sheet metal component.

The object is also achieved with the subject matter of claim 12. It is a molded sheet metal part, produced with a device of the type described above and / or a method of the type described above.

It can be provided that the formed sheet metal part is a sheet metal part that is designed as a vehicle component.

The sheet metal part can be an inner side wall or a section thereof.

Furthermore, the sheet metal part can be a cross member, longitudinal member or other support member.

It is also possible for the sheet metal molded part to be a floor panel, a floor pan or a section thereof.

Furthermore, the sheet metal part can be a component for a vehicle door.

• 1 einen Ausschnitt aus einer Vorrichtung zum Umformen und/oder Vergüten von Blechbauteilen nach dem Stand der Technik in schematischer Schnittdarstellung;
• 2 einen Ausschnitt eines ersten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung in schematischer Schnittdarstellung;
• 3 einen Ausschnitt eines zweiten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung in schematischer Schnittdarstellung;
• 4 eine schematische Draufsicht auf ein Tailored Welded Blank, gebildet aus zwei längs einer geraden Naht verschweißten Blechplatinen unterschiedlicher Materialdicke;
• 5 eine Gegenüberstellung von Schnittdarstellungen längs der Schnittlinie V-V in 4 vor und nach dem Umformen des Blechbauteils;
• 6 eine schematische Draufsicht auf ein Tailored Rolled Blank, gebildet aus einem Blechband, dessen Mittenabschnitt eine geringere Materialdicke aufweist als die beiden Randabschnitte;
• 7 eine Gegenüberstellung von Schnittdarstellungen längs der Schnittlinie VII-VII in 6 vor und nach dem Umformen des Blechbauteils.

The invention will now be explained in more detail on the basis of exemplary embodiments. Show it

• 1 a section of a device for forming and / or tempering sheet metal components according to the prior art in a schematic sectional view;
• 2 a section of a first embodiment of the device according to the invention in a schematic sectional view;
• 3 a section of a second embodiment of the device according to the invention in a schematic sectional view;
• 4 a schematic plan view of a tailored welded blank, formed from two sheet metal plates of different material thickness welded along a straight seam;
• 5 a comparison of sectional views along the section line VV in 4 before and after forming the sheet metal component;
• 6 a schematic plan view of a tailored rolled blank, formed from a sheet metal strip, the central portion of which has a smaller material thickness than the two edge portions;
• 7 a comparison of sectional views along the section line VII-VII in 6 before and after forming the sheet metal component.

1 shows a schematic section of a device 1 for forming and / or tempering sheet metal components according to the prior art with an inserted sheet metal component 11 , The sheet metal component 11 is designed as a so-called tailored welded blank, ie it consists of two sheet-metal parts 11 ' and 11 " different material thickness by a weld 11s are cohesively connected. The weld 11s can be produced, for example, by laser welding.

The device has an upper forming tool 12 , which is designed as a stamp, and a lower forming tool 13 , which is designed as a matrix. Between the upper forming tool 12 and the lower forming tool 13 is the sheet metal component 11 arranged that by pressing between the forming tools 12 and 13 is reshaped. The upper forming tool 12 has the weld seam on both sides in a transition area 11s a recess 12a on in between the sheet metal component 11 and the upper forming tool 12 there is no form fit. As a result, adequate heat treatment, ie remuneration, is not possible.

2 shows a first embodiment of the device according to the invention, wherein in 2 a schematic excerpt as in 1 is shown.

A device 2 for forming and / or tempering sheet metal components is like that in 1 shown device constructed, with the difference that instead of the recess 12a in the upper forming tool 12 (please refer 1 ) a separately movable forming tool 14 is provided in the forming tool 12 is led. The possible displacement directions are in 2 indicated by a double arrow. It can also be used instead of a forming tool 12 Two forming tools can be provided, which are adjacent to the forming tool on both sides 14 are arranged. The device 2 consists of a common lower forming tool 13 and an associated multi-part upper forming tool, which consists of the forming tools 12 and 14 is formed.

The forming tool 14 has a stepped shaped surface in the transition area of the weld 11s form-fitting on the surface of the sheet metal component 11 rests. Consequently, the deformation and / or heat treatment of the transition area of the weld seam 11s unlimited possible.

3 shows a further embodiment of the device according to the invention, which differs from that in 2 shown device differs in that the forming tool 14 from two separately movable part tools 14 ' and 14 " is formed, so that thickness tolerances occurring in the manufacturing process of the sheet metal component can be compensated for by the height difference between the shaped surfaces of the two part tools 14 ' and 14 " depending on the current material thicknesses before the forming and / or tempering or during the forming and / or tempering.

The 4 and 5 show an example of the sheet metal component designed as a tailored welded blank 11 in a sheet metal component 11u occurring shift of the transition area at the weld 11s ,

As in 4 shown is the weld 11s formed in this embodiment as a straight weld.

As in 5 the weld seam can be seen 11s in the formed sheet metal part 11u by an amount V compared to the sheet metal component 11 staggered. Around the weld 11s is a transitional area Ü formed by the device described above on the formed sheet metal part 11u can be reshaped and / or compensated.

The 6 and 7 show an example of the sheet metal component designed as a tailored rolled blank 21 in a sheet metal component 21u occurring shift of the transition area Ü between two material thicknesses.

As in 6 and 7 shown is a central portion of the band-shaped sheet metal component 21 formed with a smaller material thickness than the two adjacent outer sections. The sections have parallel boundaries because of the sheet metal component 21 is made by rolling.

As in 7 there are two transition areas Ü trained in the formed sheet metal part 21u opposite the sheet metal component 21 are each offset by an amount V. The two transition areas Ü can by the device described above on the formed sheet metal part 21u be reshaped and / or remunerated. The device used in this embodiment has two forming tools 14 (please refer 2 ) on.

The sheet metal components can be sheet metal components for vehicles, for example, such as a side wall inside or a section thereof, a cross member, side member or other support part, a floor panel, a floor pan or a section thereof or a component for a vehicle door.

LIST OF REFERENCE NUMBERS

1

Prior art device

11

sheet metal component

11u

formed sheet metal component

11 '

sheet metal part

11 "

sheet metal part

11s

Weld

12

upper forming tool

12a

recess

13

lower forming tool

14

forming tool

21

sheet metal component

21u

formed sheet metal component

21 '

Section of the sheet metal component

21 "

Section of the sheet metal component

Ü

Transition area

Claims (17)

Device (2) for reshaping and / or tempering sheet metal components (11), which are formed from at least two sheet metal parts (11 ', 11 "), which are connected via a connecting seam (11s), the area of the connecting seam (11s) being Transition area (Ü) is characterized in that the device (2) has a tool (14) which is designed for forming and / or tempering the transition area (Ü) by having a shaped surface which corresponds to the changed shape of the transition area ( Ü) after reshaping and / or tempering, taking into account the change in shape, corresponds to at least one area adjacent to the transition area (Ü), it being provided that the tool has a first part tool (14) and a second part tool (12), wherein the first part tool (14) is designed for forming and / or tempering the transition region (Ü) and the second part tool (12) is for forming and / or tempering A region adjacent to the transition region (Ü) is formed and the first part tool (14) is designed to be movable in the forming direction relatively and / or independently of other part tools. Device (2) for forming and / or tempering sheet metal components (11), which have at least one sheet metal component (21) which has two sections (21 ', 21 ") of different thickness or different material properties, the connection area between these sections as a transition area (Ü) is formed, characterized in that the device (2) has a tool (14), which is designed for reshaping and / or tempering the transition area (Ü) by having a shaped surface which corresponds to the changed shape of the transition area ( Ü) after reshaping and / or tempering, taking into account the change in shape, corresponds to at least one area adjacent to the transition area (Ü), it being provided that the tool has a first part tool (14) and a second part tool (12), wherein the first part tool (14) is designed for forming and / or tempering the transition region (Ü) and the zw Another part tool (12) is designed for forming and / or tempering an area adjacent to the transition region (Ü) and the first part tool (14) is designed to be movable in the forming direction relatively and / or independently of other part tools. Device after Claim 1 or 2 , characterized in that the tool has a first part tool (14) for reshaping and / or tempering the transition area (Ü) and a second part tool for reshaping and / or tempering the area adjoining the transition area (Ü) on a first side and a third Has a partial tool for reshaping and / or tempering a region adjacent to the transition region (Ü) on a second side, the first side and the second side being formed on sides of the transition region (Ü) facing away from one another. Device according to one of the preceding claims, characterized in that the first part tool (14) has mutually vertically offset shaped surfaces. Device after Claim 4 , characterized in that the shaped surfaces are adjustable in height. Method for forming and / or tempering sheet metal components (11) which are formed from at least two sheet metal parts (11 ', 11 "), which are connected via a connecting seam (11s), the area of the connecting seam (11s) being used as a transition area (Ü ) is formed using a device according to one of the preceding claims, characterized in that the shaping and / or tempering of the transition area (Ü) and the shaping and / or tempering of the area adjacent to the transition area (Ü) takes place in separate steps, which take place successively in time. Method for forming and / or tempering sheet metal components (11) which have at least one sheet metal component (21) which has two sections (21 ', 21 ") of different thickness or material properties, the connecting area between these sections being designed as a transition area (Ü) is, using a device according to one of the preceding claims, characterized in that the shaping and / or tempering of the transition area (Ü) and the shaping and / or tempering of the area adjacent to the transition area (Ü) takes place in separate steps, the temporal successively. Procedure according to Claim 6 or 7 , characterized in that the transition region (Ü) is formed and / or tempered after or shortly before the shaping of the sheet metal component (11, 21) is completed. Procedure according to one of the Claims 6 to 8th , characterized in that the transition area (Ü) is hot formed. Procedure according to Claim 7 , characterized in that an already formed sheet metal component (11u, 21u) is inserted into the device and the transition area (Ü) is tempered. Procedure according to one of the Claims 6 to 10 , characterized in that the sheet metal component (11, 21) is cold formed. Sheet metal part, produced with a device according to one of the Claims 1 to 5 and / or a method according to one of the Claims 6 to 11 , Sheet metal part after Claim 12 , characterized in that the sheet metal part is a vehicle component. Sheet metal part after Claim 13 , characterized in that the sheet metal part is a side wall inside or a portion thereof. Sheet metal part after Claim 13 , characterized in that the sheet metal part is a cross member, side member or other support member. Sheet metal part after Claim 13 , characterized in that the sheet metal part is a floor panel, a floor pan or a portion thereof. Sheet metal part after Claim 13 , characterized in that the sheet metal part is a component for a vehicle door.

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