DE102008056273A1 - Closed hollow section production method for construction of cabriolet vehicle, involves transforming plate to closed section, as flange areas are formed according to rolling process, and welding bent portions among themselves - Google Patents

Abstract

The method involves transforming a plate, as bent portions (9, 10) outwardly protruded and extended when viewing in a longitudinal direction of a closed hollow section and formed on both sides of the plate. The plate provided with the bent portions is transformed as the plate is pulled by a stamp (4a) of an actually deforming tool. The plate pulled and provided with the bent portions is transformed to the closed section, as flange areas (2b) are formed according to a rolling process around a core geometry of a mold core. The bent portions are welded among themselves. The closed hollow section is formed as a body column. An independent claim is also included for a device for production of a closed hollow section.

Description

The The invention relates to a method for producing a closed Hollow profiles, one produced in particular by this method closed hollow profile and a device for manufacturing Such a closed hollow profile according to the Feature combination of claim 1 or 8 or 13.

From practice and the patent literature various methods for the production of closed hollow profiles are known. For some time, however, experts have favored methods which, in turn, include a so-called "rolling-in technique" ( DE 10 2006 017 119 A1 . DE 10 2006 025 522 A1 . DE 10 2007 008 641 A1 ). Essentially, it is provided here in a first forming step, first of all, to partially reshape a blank by deep drawing in such a way that a lower deep-drawn region as well as an upper flange region are formed. In a subsequent forming step, the lower deep-drawn region and said flange regions are then formed around a previously retracted mold core by means of side cheek mold halves of a forming tool known per se until the end edges of the flange regions abut one another. Finally, the flange areas in your contact area are welded together by forming an I-weld. By such a method hollow sections with variable cross-sectional shapes, wall thicknesses and stiffness can be produced, as they are increasingly used in vehicle. Regardless, such a designed manufacturing process requires due to the favored I-weld a precise trimming of the original board, since inaccuracies can not be compensated with hindsight or only with considerable effort. This is where the invention described below begins.

task The invention is first, a simpler and cheaper To be performed method of the generic Specify type, which the adverse circumstance described above to take account of the fact that in particular costly Trimming the original board before forming it to ensure the creation of a conventional I-weld are avoidable. It is also a task, in particular according to this Process produced closed hollow profile and a device to create such a closed hollow profile.

Of the Invention is based on the finding that by creating a shut off welding flange instead of an I-push Dimensional inaccuracies or tolerances of origin or Output board in the production of a closed hollow profile by forming, the board easy and inexpensive can be countered.

• a) Bereitstellung einer Platine;
• b) Umformung der Platine in einem ersten Umformschritt, indem in Längsrichtung des herzustellenden Hohlprofils gesehen, beidseitig der Platine je eine sich in Längsrichtung des Hohlprofils erstreckende und nach außen weisende Abstellung ausgebildet wird;
• c) Umformung der mit besagten Abstellungen versehenen Platine in einem zweiten Umformschritt, indem die Platine vermittels eines sich in Längsrichtung des herzustellenden Hohlprofils erstreckenden Stempels eines an sich bekannten Umformwerkzeuges durch Tiefziehen zu einem unteren Bereich des Hohlprofils mit zwei beidseitig der Platine gegenüberstehenden Flanschbereichen, die von dem besagten unteren Bereich des Hohlprofils abstehen, gezogen wird, wobei die Abstellungen gemäß Verfahrensschritt b) erhalten bleiben;
• d) Umformung der mit besagten Abstellungen versehenen sowie gezogenen Platine in einem dritten Umformschritt zu einem geschlossenen Hohlprofil, indem die Flanschbereiche nach einem an sich bekannten Einrollverfahren um die Kerngeometrie zumindest eines vorab eingefahrenen Formkerns eines an sich bekannten Umformwerkzeuges herumgeformt und die Abstellungen in Form von Schweißflanschen weitestgehend plan zusammengeführt werden; und
• e) Verschweißen der beiden Abstellungen untereinander.

On this basis, the object is accordingly achieved by a method for producing a closed hollow profile, which comprises the following steps to be carried out successively:

• a) providing a circuit board;
• b) forming the board in a first forming step, as seen in the longitudinal direction of the hollow profile to be produced, is formed on both sides of the board each one extending in the longitudinal direction of the hollow profile and facing outward Abstellung;
• c) forming the board provided with said shutters in a second forming step by the board by means of extending in the longitudinal direction of the hollow profile to be produced stamp of a known forming tool by deep drawing to a lower portion of the hollow profile with two sides of the board facing flange portions of protrude the said lower portion of the hollow profile, is pulled, wherein the shutdowns remain in accordance with method step b);
• d) transformation of the provided with said shutdowns and drawn board in a third forming step to form a closed hollow profile by the flange after a known curl around the core geometry of at least one pre-retracted mandrel of a known forming tool and the shutdowns in the form of welding flanges be brought together as far as possible; and
• e) welding the two stops together.

The Subclaims describe preferred developments or Embodiments of the invention.

Thereafter, it can be provided, with regard to the method step a), to provide a blank made of a cold- or hot-formable steel. Furthermore, with regard to method step a), it may be advantageous to provide a cold-formable steel circuit board which has one or more areas reinforced by "patchwork blanks", "tail blanks" and / or "tail-edge strips". With regard to method step b), it may further be provided to produce the shutdowns by means of deep drawing, swaging, roll forming or the like known per se. With regard to the method step e), it is advantageous to weld the two stops together, while the formed board is still in the Forming tool is located. Further advantageously, the two shutdowns can be welded together by laser welding, spot welding and / or according to another suitable welding method known per se. Finally, if necessary, a dimensionally accurate trimming of the two welded-together abutments, respectively of the welding flange created, can follow process step e).

The closed hollow profile made of metal, in particular of steel or a steel alloy, with an axially extending weld, in particular prepared according to the above-described Procedure, characterized essentially by the fact that the closed Hollow profile over the entire length of the hollow profile extending deep-drawn area with in the longitudinal direction of the hollow profile seen formed on both sides of the deep-drawn area Has flange portions, wherein at the respective free end of said flange portions each formed by forming a shutdown is formed, and wherein the shutters are designed so that these subsequently to a known rolling-in method in which the deep-drawn Area and the flange areas around the core geometry of a mold core a per se known forming tool are guided around, after outside and largely merged plan and welded, the axially extending weld form. The axially extending weld can here by laser welding, spot welding and / or according to another suitable welding method known per se be generated. Advantageously, the hollow profile of a board be formed a cold or hot forming steel, wherein a Hollow profile, which consists of a board made of a kaltumformbaren Steel is formed, further one or more by "patchwork Blanks "," Tailord Blanks "and / or" Tailord Strips "reinforced areas may have. Especially advantageous, the hollow section as a body pillar for the vehicle, in particular be designed as an A-pillar.

The The invention also relates to a device for producing a closed Hollow profiles from a board, with at least one forming tool in Form of a mold pressure die wherein the mold pressure die at least a mold pressure stamp and a die, and wherein the Molded die at least one retractable in the same mold core can be assigned to its core geometry according to a known per se Rolling the board is formed around. In particular, will suggested that the forming punch and / or the at least a retractable mandrel is a means of support the guidance and / or fixation of pre-formed and parked outside and in the longitudinal direction the produced hollow profile extending shutdowns of the board in the form of welded to each other welding flanges during the implementation of said rolling process exhibit. The means to support the leadership and fixation of pre-formed and externally parked and in the longitudinal direction of the hollow profile to be produced extending shutdowns on the form pressure stamp, for example by a longitudinal groove in the same for receiving and fixing the shutdowns during the execution of the Rolling be formed. Furthermore, in isolation or in combination with the above-described means, the agent in support of leadership and fixation of already formed and turned off and out extending in the longitudinal direction of the hollow profile to be produced Deposits on at least one retractable mold core also by an extending in the longitudinal direction of the hollow profile to be produced local increase be formed on which the shutdowns during the implementation of said rolling process slip on forced.

The Invention will now be described schematically with reference to the drawings illustrated embodiment explained in more detail. Show it:

1a , b very schematically the representation of a known forming method for producing a closed hollow profile according to the so-called Einrolltechnik (prior art),

2 the representation of a suitable forming tool for forming a prepared board by deep-drawing known per se,

3 the representation of a suitable forming tool with a retracted mold core at the beginning of a process step subsequent to the deep-drawing step for further shaping of the blank according to a rolling-in method known per se,

4 the representation of the forming tool after 3 with finally converted board, and

5 exemplifying a produced by the inventive method and the inventive device closed hollow profile in the form of an A-pillar of a motor vehicle.

As already described above, it is already known closed hollow sections 1 to produce according to the so-called "rolling-in technique". Essentially, this is according to 1a a circuit board 2 in a first forming step by means of a known forming tool in the form of a mold pressure die with a lower die 3 and a superstar 4 which in turn has a stamp 4a on has, the present case at the same time the mold core 5 for a subsequent forming step, first the board 2 partially formed by deep drawing such that a lower deep-drawn area 2a as well as two raised flange areas 2 B be formed.

In an in 1b shown subsequent forming step then the lower deep-drawn area 2a and the said flange portions 2 B around the core geometry of the mold core 5 by means of appropriately trained Seitenwangengesenkhälften 6 . 7 formed around the forming tool until the end edges of the flange 2 B lie on each other in push. Finally, the flange areas 2 B in your contact area by means of a known welding device 8th , For example, a laser welding device welded together by an I-weld is formed.

By such a method are when using appropriately prepared boards 2 closed hollow profiles 1 With variable cross-sectional shapes, wall thicknesses and stiffness produced, as they are increasingly used in vehicle. However, such a fabricated manufacturing process requires a precise trimming of the source or output board due to the favored I-weld 2 because inaccuracies can not be compensated in hindsight or only with considerable effort.

To cope with this fact, an improved method for producing a closed hollow profile 1 according to the 2 to 5 proposed as follows.

First, it is provided that a provided board 2 , which is preferably trimmed, but no longer required to have the required degree of accuracy to produce a conventional I-weld, during a first Umformschrittes is transformed such that in the longitudinal direction of the hollow profile to be produced 1 seen, for example, according to 5 seen in the longitudinal direction of an A-pillar of a motor vehicle, both sides of the board 2 one each in the longitudinal direction of the hollow profile 1 extending and outward facing shutdown 9 . 10 is trained.

The board 2 can consist of a cold formable, optionally higher strength or of a thermosetting or thermoformable steel, wherein a circuit board 2 , which is formed from a cold-workable steel, further comprising one or more patchwork blanks, "Tailord blanks" and / or "Tailord Strips" reinforced areas, whereby different wall thicknesses and / or stiffnesses of the finished hollow profile 1 are feasible.

Said shutdowns 9 . 10 like her 2 can be seen, can be prepared by known per se deep drawing, swaging, roll forming or the like. (Not shown in detail).

Based on 1a and with particular reference to 2 then the one with said shutdowns 9 . 10 provided board 2 by means of an upper Gesenkes 4 with itself in the longitudinal direction of the hollow profile to be produced 1 extending stamp 4a a known forming tool or drawing tool by deep drawing to a lower die 3 or in a die forming lower area 2a with two flange areas 2 B from the lower area 2a of the hollow profile 1 stand, pulled, with the pre-trained shutdowns 9 . 10 remain.

According to 3 In the present case, there is a so-called U-stamp 4a Use, whereby with the help of the U-stamp 4a associated vertically formed side walls 11 . 12 of the forming tool, the two flange areas 2 B a vertical orientation to the lower, in the present plan trained area 2a taking.

In a third forming step, according to the 3 and 4 those with said shutdowns 9 . 10 provided and drawn board 2 to a closed hollow profile 1 deformed by the flange areas 2 B by means of a mold pressure stamp 13 a Formdruckgesenkes, which a not-shown in detail, but known per se die for receiving the pre-formed by deep drawing board 2 is assigned, after the se. Known curl method to the core geometry of at least one pre-retracted mold core 5 shaped around and the shutdowns 9 . 10 be brought together in the form of welding flanges plan. Said die can by the above-described lower die 3 , which is used during the second forming step, be formed.

Like that 3 and 4 can be further seen, both have the form pressure stamp 13 as well as the mold core 5 a means 14 . 15 to support the management and / or fixation of the shutdowns 9 . 10 the board 1 during the implementation of the curling process.

That's the way it is 14 to support the management and / or fixation of the shutdowns 9 . 10 through a longitudinal groove in the mold pressure stamp 13 formed, in which the shutdowns 9 . 10 penetrate to the end of said rolling process and thus be fixed.

To this longitudinal groove corresponds another means 15 to support the management and / or fixation of the shutdowns 9 . 10 on the mold core 5 which is essentially arranged by a radially to the longitudinal groove and in the longitudinal direction of the hollow profile to be produced 1 extending local elevation is formed, on which the shutdowns 9 . 10 during the implementation of the rolling-in advantageous up in the manner of a forced operation and subsequently introduce into the longitudinal groove. Said local increase can be generated or modified, for example, by milling the core geometry or subsequently by means of build-up welding.

In the end, the two largely coordinated mergers 9 . 10 in the form of welding flanges with each other by means of a known per se and thus not shown here welding device 8th (cf however 1b ) are welded reliably, including offered to known welding methods, such as laser welding, spot welding and / or other suitable welding methods known per se.

Like that 3 and 4 can still be seen, is the form pressure stamp 13 formed closed upwards and must therefore be removed before welding. However, the invention is not limited to such a mold pressure stamp 13 , but also includes a longitudinally divided form pressure stamp not shown in detail 13 whose punch halves are arranged spaced from each other in such a way that said longitudinal groove is equivalent and accordingly realized the same effect by the spacing of the two punch halves. In this case, advantageously, the welding of an axially extending longitudinal seam can take place when the deformed circuit board 2 still located in the forming tool or even from the longitudinally divided mold pressure stamp 13 is fixed, whereby any suspensions of the flange 2 B are effectively avoided.

is said longitudinal seam welded, if necessary or desired, the created welded flange Finally, cut to a desired level become. The trimming can be advantageous by laser cutting and during the creation of the weld through Laser welding can be performed (not closer shown).

As already indicated above, the method described above and the apparatus for carrying out the method for producing a body pillar for vehicle construction, in particular for producing an A pillar, primarily for producing an A pillar for a convertible vehicle ( 5 ). Due to the particular rigidity requirements for an A-pillar of a convertible vehicle, especially during a rollover crash event, it is using appropriately designed and / or pre-treated source or output boards 2 allowed to produce the body pillar or A-pillar according to the method described above easily and inexpensively.

1

hollow profile

2

circuit board

2a

deep-drawn area (board 2 )

2 B

Flange areas (board 2 )

3

lower die

4

upper die

4a

stamp

5

mold core

6

Seitenwangengesenkhälfte

7

Seitenwangengesenkhälfte

8th

welder

9

secondment

10

secondment

11

Side wall

12

Side wall

13

Form plunger

14

Means for supporting the management and / or fixing of the shutdowns 9 . 10 (Longitudinal groove in the mold pressure stamp 13 )

15

Means for supporting the management and / or fixing of the shutdowns 9 . 10 (local boost on the mandrel 5 )

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102006017119 A1 [0002]
• - DE 102006025522 A1 [0002]
• DE 102007008641 A1 [0002]

Claims (15)

Method for producing a closed hollow profile ( 1 ), characterized by the following process steps to be carried out successively: a) provision of a printed circuit board ( 2 ); b) forming the board ( 2 ) in a first forming step, by in the longitudinal direction of the hollow profile to be produced ( 1 ), both sides of the board ( 2 ) one each in the longitudinal direction of the hollow profile ( 1 ) extending and outward facing Abstell ( 9 . 10 ) is formed; c) transformation of said shutdowns ( 9 . 10 ) board ( 2 ) in a second forming step by the board ( 2 ) by means of a in the longitudinal direction of the hollow profile to be produced ( 1 ) extending punch ( 4a ) of a known forming tool by deep drawing to a lower area ( 2a ) of the hollow profile ( 1 ) with two sides of the board ( 2 ) opposite flange areas ( 2 B ) coming from the said lower area ( 2a ) of the hollow profile ( 1 ), is withdrawn, the shelters ( 9 . 10 ) are retained according to process step b); (d) transformation of said shutdowns ( 9 . 10 ) and pulled board ( 2 ) in a third forming step to a closed hollow profile ( 1 ), the flange areas ( 2 B ) according to a rolling-in method known per se about the core geometry of at least one previously retracted mandrel (US Pat. 5 ) formed around a forming tool known per se and the shutdowns ( 9 . 10 ) are brought together as far as possible in the form of welding flanges; and e) welding the two shutters ( 9 . 10 ) among themselves. A method according to claim 1, characterized in that with regard to the method step a) a circuit board ( 2 ) is provided from a cold or hot forming steel. Method according to one of claims 1 or 2, characterized in that with regard to the method step a) a circuit board ( 2 ) is provided from a cold formable steel having one or more patchwork blanks, tailor blanks, and / or tailord strips. A method according to claim 1, characterized in that with regard to the method step b) the shutdowns ( 9 . 10 ) are produced by deep-drawing, stamping, roll forming or the like known per se. A method according to claim 1, characterized in that with regard to the method step e) the two shutdowns ( 9 . 10 ) are welded together while the deformed board ( 2 ) is still in the forming tool. A method according to claim 1, characterized in that with regard to the method step e) the two shutdowns ( 9 . 10 ) are welded together by laser welding, spot welding and / or by another suitable welding method known per se. Method according to one of claims 1 to 6, characterized in that at the process step e) a dimensionally accurate trimming of the two mutually welded shutdowns ( 9 . 10 ). Closed hollow profile ( 1 ) made of metal, in particular steel or a steel alloy, with an axially extending weld, in particular produced by a method according to one or more of claims 1 to 7, wherein the closed hollow profile ( 1 ) one over the entire length of the hollow profile ( 1 ) extending deep-drawn area ( 2a ) in the longitudinal direction of the hollow profile ( 1 ) seen on both sides of the deep-drawn area ( 2a ) formed flange areas ( 2 B ), wherein at the respective free end of said flange portions ( 2 B ) each one created by deformation Abstell ( 9 . 10 ), and the shutdowns ( 9 . 10 ) are designed so that these follow a known rolling-in method, in which the deep-drawn region ( 2a ) and the flange areas ( 2 B ) around the core geometry of a mold core ( 5 ) are guided around a per se known forming tool, facing outward and largely brought together plan and welded, forming the axially extending weld. Closed hollow profile ( 1 ) according to claim 8, characterized in that the axially extending weld seam is produced by laser welding, spot welding and / or according to another suitable welding method known per se. Closed hollow profile ( 1 ) according to one of claims 8 to 9, characterized in that the hollow profile ( 1 ) from a board ( 2 ) is formed from a cold- or hot-formable steel. Closed hollow profile ( 1 ) according to one of claims 8 to 10, characterized in that the hollow profile ( 1 ) from a board ( 2 ) is formed from a cold formable steel having one or more areas reinforced by "patchwork blanks", "tail blanks" and / or "tailor strips". Closed hollow profile ( 1 ) according to one of claims 8 to 11, characterized in that the hollow profile ( 1 ) as a body pillar for the driving tool construction is designed in particular as an A-pillar. Device for producing a closed hollow profile ( 1 ) according to one of claims 8 to 13 from a circuit board ( 2 ), with at least one forming tool in the form of a mold pressure die, wherein the mold pressure die at least one mold pressure stamp ( 13 ) and a die, and wherein the molding die at least one retractable in the same mold core ( 5 ) can be assigned to its core geometry according to a rolling process known per se, the board ( 2 ), characterized in that the forming pressure stamp ( 13 ) and / or the at least one retractable mandrel ( 5 ) a means ( 14 . 15 ) to support the guidance and / or fixation of pre-formed and outwardly parked and in the longitudinal direction of the hollow profile to be produced ( 1 ) extending redundancies ( 9 . 10 ) of the board ( 2 ) in the form of welded to each other welding flanges during the implementation of said rolling process. Device according to claim 13, characterized in that the means ( 14 ) to support the guidance and fixing of pre-formed and outwardly parked and in the longitudinal direction of the hollow profile to be produced ( 1 ) extending redundancies ( 9 . 10 ) on the mold pressure stamp ( 13 ) by a longitudinal groove in the same for receiving and fixing the shutdowns ( 9 . 10 ) is formed during the implementation of the rolling process. Device according to claim 13, characterized in that the means ( 15 ) to support the guidance and fixation of already formed and outwardly parked and in the longitudinal direction of the hollow profile to be produced ( 1 ) extending redundancies ( 9 . 10 ) on at least one retractable mold core ( 5 ) by a longitudinal direction of the hollow profile to be produced ( 1 ) extending local increase, on which the shutdowns ( 9 . 10 ) slip forcibly guided during the implementation of said rolling process.