EP2594346A1 - Device and method for manufacturing profiles with form that have variable position and are oriented in the length direction - Google Patents

Abstract

The method involves providing a molding tool having a cross-sectional shape of hollow profile element blank at input side and variable formation section at an output side. The profile element blank is positioned at the input side. The relative movement of the molding tool and the profile element blank is carried out in axial direction while simultaneously carrying out a relative rotation between the molding tool and profile element blank about an axial axis of molding tool so as to mold profile element blank into profile having hollow section (22) with variable formation (23). An independent claim is included for device for manufacturing profile element having curved hollow section with variable formation.

Description

The invention relates to a method and an apparatus for producing profiles with at least one positionally variable, longitudinally oriented shaping of a profile blank.

Both in motor vehicle construction and in other technical fields, for example in a chair guide of a stairlift, profiles, in particular curved hollow profiles are required, which have a positionally variable, in particular twisted, longitudinally oriented shape. An A-pillar, which for example additionally forms a roof frame, can have correspondingly variable position, in particular twisted, longitudinally oriented formations for providing the necessary strength and / or sealing surfaces. The same applies to profiles for chair guides of stairlifts, which are often divided into individual segments connected locally in the stairwell and fixed by brackets on the wall or the stairs. Specific cross-sectional shapes of these profiles are intended to ensure that the guided chair and the forces introduced by it onto the hollow profile are absorbed and the chair is nevertheless always guided in a spatially aligned manner. For this purpose, the bent profiles are subjected to a torsion, so that the required for a guide formation of the hollow profile always has the same orientation, for example, to a vertical wall. Curved hollow sections are therefore usually one subjected to appropriate torsion to ensure the correct orientation of the molding. The longitudinally oriented formations must therefore be variable in position, or twisted. However, a torsion of a curved hollow profile does not allow large torsion values in ° / mm or changes in position of the formations to be achieved without an increasing warping of the cross sections of the hollow profile. In addition, the introduction of a torsion is possible only in a relatively short, free length of the hollow profile, which must be between two restraints. As a result, the introduction of a twist in a relatively long hollow profile is particularly time-consuming, since only small sections of the hollow profile can be gradually twisted.

From the European patent EP 1 863 604 B1 On the one hand, a device and a method for free-form bending of longitudinal profiles, in particular of tubes is known, which also allows small bending radii in the reshaped hollow profile with a simple construction. In addition, from the German patent specification DE 38 07 002 C1 known, variable position, in particular twisted formations in a straight tube using a drawing ring and a pulling core, which has obliquely twisted grooves known.

From the known prior art, the invention has the object, a method and an apparatus for producing profiles or hollow profiles, which have at least one variable position, longitudinally oriented shape to provide, with which or with which with as few steps and low apparativem Effort can be made according to a positionally variable formations exhibiting profile.

• Bereitstellen eines Formgebungswerkzeugs, welches am Eingang die Querschnittsform eines Profil- oder Hohlprofilrohlings und am Ausgang eine geänderte Querschnittsform mit mindestens einer Ausformung aufweist,
• Positionieren eines Profil- oder Hohlprofilrohlings am Eingang des Formgebungswerkzeugs,
• Durchführen einer Relativbewegung in Axialrichtung zwischen dem Formgebungswerkzeug und dem Profil- oder Hohlprofilrohling bei gleichzeitiger Durchführung einer relativen Drehung zwischen dem Formgebungswerkzeug und dem Profil- oder Hohlprofilrohling um eine Axialachse des Formgebungswerkzeugs, des Profils oder Hohlprofils, um eine lageveränderliche Ausformung über das Formgebungswerkzeug in den Profil- oder Hohlprofirohling einzubringen.

According to the first teaching of the present invention, at least one variable-length, longitudinally oriented molding having profiles or hollow profiles are simplified from profile or hollow profile blanks produced by a method

• Providing a forming tool having at the entrance the cross-sectional shape of a profile or hollow profile blank and at the exit a modified cross-sectional shape with at least one formation,
• Positioning a profile or hollow profile blank at the entrance of the forming tool,
• Performing a relative movement in the axial direction between the forming tool and the profile or hollow profile blank while simultaneously performing a relative rotation between the forming tool and the profile or hollow profile blank about an axial axis of the forming tool, the profile or hollow profile to a variable position shaping over the forming tool in the profile - or hollow profile blank to bring.

By the use of a forming tool, which is rotated relative to the profile or hollow profile blank, a position-variable shape can be introduced into a profile or hollow profile, without the profile or Hollow profile must be twisted. A strong change in position of the molding, for example, a strong twisting the formation of the profile or hollow profile is thus no longer dependent on the Tordierungsvermögen the profile or hollow profile and can be introduced in one step.

According to a first embodiment, the method according to the invention can be improved by bending the deformed profile or hollow profile exiting the forming tool using a downstream bending mold with optional bending mandrel, so that the profiles or hollow profiles provided with a variable-configuration can be bent in one work step ,

• Bereitstellen eines als Ringspaltwerkzeug ausgebildetes Formgebungswerkzeug mit einem äußeren und einem inneren Gesenk, welche einen Ringspalt, einen Ringspalteingang und einen Ringspaltausgang bilden, wobei der Ringspalt am Ringspalteingang die Querschnittsform eines Profil-oder Hohlprofilrohlings hat und am Ringspaltausgang eine geänderte Querschnittsform mit mindestens einer Ausformung vorgesehen ist, wobei die Breite des Ringspaltes größer oder gleich der Wanddicke des Profil-oder Hohlprofilrohlings ist,
• Positionieren eines Profil- oder Hohlprofilrohlings am Eingang des Ringspaltwerkzeugs und
• Durchführen einer Relativbewegung in Axialrichtung zwischen dem Ringspalt des Ringspaltwerkzeugs und dem Profil- oder Hohlprofilrohling bei gleichzeitiger relativer Drehung des äußeren Gesenks des Ringspaltwerkzeugs gegenüber dem Profil- oder Hohlprofilrohling um die Axialachse des Ringspaltwerkzeugs, des Profil- oder Hohlprofilrohlings, um eine lageveränderliche Ausformung über das Ringspaltwerkzeug in den Profil- oder Hohlprofilrohling einzubringen.

According to a next embodiment of the method according to the invention, at least one profile-variable profile having profiles, in particular hollow profiles simplified from profile blanks, in particular hollow profile blanks produced by

• Providing a designed as an annular gap forming tool with an outer and an inner die, which form an annular gap, an annular gap entrance and an annular gap exit, wherein the annular gap at the annular gap entrance has the cross-sectional shape of a profile or hollow profile blank and at the annular gap output a modified cross-sectional shape is provided with at least one formation wherein the width of the annular gap is greater than or equal to the wall thickness of the profile or hollow profile blank,
• Positioning a profile or hollow profile blank at the entrance of the annular gap tool and
• Performing a relative movement in the axial direction between the annular gap of the annular gap tool and the profile or hollow profile blank with simultaneous relative rotation of the outer die of the annular gap tool relative to the profile or hollow profile blank around the axial axis of the annular gap tool, the profile or hollow profile blank to a variable position shaping over the annular gap tool in the profile or hollow profile blank to bring.

• ein Ringspaltwerkzeug mit einem inneren und einem äußeren Gesenk, welche einen Ringspalt, einen Ringspalteingang und einen Ringspaltausgang bilden, wobei der Ringspalt am Ringspalteingang die Querschnittsform des Profilrohlings, insbesondere Hohlprofilrohlings und am Ringspaltausgang die Querschnittsform des Profils, insbesondere Hohlprofils mit mindestens einer längsorientierten Ausformung aufweist,
• Mittel zur Durchführung einer Relativbewegung in Axialrichtung zwischen dem Ringspalt des Ringspaltwerkzeugs und dem Profilrohling, insbesondere Hohlprofilrohling, bevorzugt eine Profilvorschubeinheit und umfassend
• Mittel zur Durchführung einer relativen Drehung des Ringspaltwerkzeugs gegenüber dem Profil- oder Hohlprofilrohling um die Axialachse des Ringspaltwerkzeugs, des Profil- oder des Hohlprofilrohlings.

According to this embodiment of the present invention, a device is used for the production of profiles, in particular hollow profiles with a longitudinally oriented, variable-position shaping comprising:

• an annular gap tool having an inner and an outer die, which form an annular gap, an annular gap entrance and an annular gap exit, the annular gap at the annular gap entrance having the cross-sectional shape of the profile blank, in particular hollow profile blank and at the annular gap exit the cross-sectional shape of the profile, in particular hollow profile with at least one longitudinally oriented formation,
• Means for performing a relative movement in the axial direction between the annular gap of the annular gap tool and the profile blank, in particular Hollow section blank, preferably a profile feed unit and comprising
• Means for performing a relative rotation of the annular gap tool relative to the profile or hollow profile blank around the axial axis of the annular gap tool, the profile or the hollow profile blank.

Instead of hollow profile blanks, of course, profile blanks of open profiles can be reshaped. Preferably, in the relative axial rotation of the outer die of the annular gap tool relative to the profile or hollow profile blank, the outer die and / or the preferably hollow profile blank is actively rotated using appropriate means themselves, i. the outer die is actively rotated via a drive and / or the profile or hollow profile blank, for example using a profile feed unit. This eliminates the one hand, the need for complicated to produce, twisted groove exhibiting annular gap tools from the prior art. Preferably, the rotational movement need not be provided by the propulsion of the profile or hollow profile or by the relative profile feed, so that the forming forces are smaller.

The just described method or the device with a forming tool or annular gap tool which is used according to the first teaching of the invention for the production of profiles or hollow profiles with at least one variable-position formation, can additionally all the features of the method mentioned below or the device for introducing position-variable, longitudinally oriented formations in a profile or hollow profile blank using a corresponding shaping tool, which together with a bending mold according to another aspect of the present invention for producing curved hollow profiles, which have at least one longitudinally oriented, variable-position formation used will be, and contribute to solving this teaching of the present invention.

Thus, the device for producing preferably hollow profiles, which have at least one longitudinally oriented, variable-position formation, for example, be arranged on a profile bending machine, since this can provide means for carrying out the relative movement and the relative rotation in a simple manner. In this respect, reference is made to the following description of a method and an apparatus for producing curved hollow profiles with at least one positionally variable, longitudinally oriented formation.

• Bereitstellen eines Ringspaltwerkzeugs mit einem äußeren und einem inneren Gesenk, welche einen Ringspalt, einen Ringspalteingang und einen Ringspaltausgang bilden, wobei der Ringspalt am Ringspalteingang die Querschnittsform eines Hohlprofilrohlings hat und am Ringspaltausgang eine geänderte Querschnittsform mit mindestens einer Ausformung vorgesehen ist, wobei die Breite des Ringspaltes größer oder gleich der Wanddicke des Hohlprofilrohlings ist,
• Bereitstellen einer Biegeform und optional eines Biegedorns, welche nachgeordnet zum Ringspaltwerkzeug angeordnet sind und einen Ringspalt zum Biegen des im Ringspaltwerkzeug umgeformten Hohlprofilrohlings bilden, wobei die Breite des Ringspaltes größer oder gleich der Wanddicke des Hohlprofilrohlings ist,
• Positionieren des Hohlprofilrohlings am Ringspalteingang,
• Durchführen einer Relativbewegung in Axialrichtung zwischen dem Ringspalt des Ringspaltwerkzeugs, dem Ringspalt, welcher durch die Biegeform und optional den Biegedorn bereitgestellt wird, und dem Hohlprofilrohling bei gleichzeitiger relativer Axialdrehung des äußeren Gesenks des Ringspaltwerkzeugs gegenüber dem Hohlprofilrohling oder relativer Axialdrehung des Hohlprofilrohlings gegenüber dem äußeren Gesenk des Ringspaltwerkzeugs,
• Biegen des am Ringspaltausgang austretenden, umgeformten Hohlprofils unter Verwendung der Biegeform und optional des Biegedorns, welche durch eine relative Axialdrehung während des Biegvorgangs der Position der mindestens einen Ausformung im umgeformten Hohlprofilrohling folgt.

According to a further embodiment of the present invention, curved hollow profiles which have a longitudinally oriented, variable-position formation can be produced in a simplified manner by a method comprising the following method steps:

• Providing an annular gap tool with an outer and an inner die, which form an annular gap, an annular gap entrance and an annular gap exit, wherein the annular gap at the annular gap entrance has the cross-sectional shape of a hollow section blank and on Annular gap output a modified cross-sectional shape is provided with at least one shape, wherein the width of the annular gap is greater than or equal to the wall thickness of the hollow profile blank,
• Providing a bending mold and optionally a bending mandrel which are arranged downstream of the annular gap tool and form an annular gap for bending the hollow profile blank formed in the annular gap tool, the width of the annular gap being greater than or equal to the wall thickness of the hollow profile blank,
• Positioning the hollow section blank at the annular gap entrance,
• Performing a relative movement in the axial direction between the annular gap of the annular gap tool, the annular gap, which is provided by the bending mold and optionally the bending mandrel, and the hollow profile blank with simultaneous relative axial rotation of the outer die of the annular gap tool relative to the hollow section blank or relative axial rotation of the hollow section blank relative to the outer die annular gap tool
• Bending the reshaped hollow profile exiting at the annular gap exit using the bending mold and optionally the bending mandrel which, by a relative axial rotation during the bending operation, follows the position of the at least one formation in the reshaped hollow profile blank.

This according to a preferred embodiment of the inventive method combines the introduction of storable, longitudinally oriented formations in a hollow profile using an annular gap tool with the bending of the formed hollow profile using a bending mold and optionally a bending mandrel, preferably by the relative rotation of the outer die of the annular gap tool to the axial axis of the hollow profile, the at least one variable position, longitudinally oriented formation is introduced into the hollow profile without the hollow profile itself is subjected to a torsion. The rotatably arranged bending mold ensures that, despite the position-variable shaping of the hollow profile, bending of the hollow profile can be achieved by a relative movement in the axial direction, that is to say a translational relative movement, of hollow profile and bending form. Due to the very good forming properties, the hollow profile blanks are preferably made of a steel. However, other readily deformable metals, such as aluminum, aluminum alloys, copper, copper alloys, etc. may be used. The bending mold can be arranged freely rotating or, alternatively, be rotatable about its longitudinal axis, for example by means of a motor drivable. This can have an advantageous effect on the control possibility, for example, on complex bending geometries, in particular on three-dimensional bending geometries or support their generation.

In particular, with the method according to the invention in one step, a curved hollow profile, which has longitudinally oriented and positionally variable formations, are produced. Instead of hollow profile blanks can Also profile blanks can be used by open profiles. Preferably, hollow profile blanks are preferably used as tubes with a circular cross-section. However, the use of hollow profile blanks with other cross-sectional shapes, such as elliptical and rectangular cross-sectional shape is conceivable. For the method, it is irrelevant whether the hollow section blank is displaced in the axial direction and rotated about its axial axis compared to an axially fixed annular gap tool and a fixed bending shape or the hollow profile blank is fixed and the annular gap tool and the bending mold relative to the fixed Hollow profile blank moved axially and / or rotated about the axial direction of the hollow section blank.

The fact that the annular gap width of both the annular gap tool and the annular gap, which are formed by the bending mold and the optional bending mandrel is greater than or equal to the wall thickness of the reshaped hollow profile blank, ensures that the frictional forces for introducing the variable position, longitudinally oriented formation and bending of the Hollow profiles do not get too big. Preferably, a game of a few tenths of a millimeter is provided here.

According to a further embodiment of the method according to the invention during the introduction of the at least one formation in the hollow profile blank, the change in the circumference of the hollow profile blank is a maximum of +/- 25%, preferably a maximum of +/- 15%. This ensures that the required pressure forces to push the profile through the annular gap does not assume any impermissibly high values and no forming work has to be performed in the direction of the sheet metal plane.

Moreover, it has been shown that an advantageous embodiment can be provided by the fact that the hollow profile blank is not changed in its shape in an inlet region of the annular gap inlet and / or in an outlet region at the annular gap outlet during the relative movement. This ensures further stabilization and at the same time a calibration of the introduction of the position-variable, longitudinally oriented formations into the hollow profile blank.

According to a next embodiment of the method according to the invention, the relative movement between the hollow profile blank and the annular gap tool and bending mold is performed by advancing the hollow profile blank using a profile feed unit, the method can be carried out with axially fixed annular gap tool and bending mold or optionally fixed mandrel. As a result, the expenditure on equipment for carrying out the method according to the invention is reduced.

Preferably, the hollow section blank is rotated during the profile feed, optionally using the profile feed unit, so that both the outer die of the annular die and the bending die can be additionally made stationary with respect to axial rotation. This means an additional reduction in the expenditure on equipment for the process according to the invention. Alternatively, the hollow section blank during the profile feed, optionally below Use of a profile feed unit, for manipulating a 3D bending geometry, and the annular gap tool for introducing the position-variable, longitudinally oriented formations rotated. As a result, a bending can preferably be initiated by deflection of the bending mold relative to the center axis of the hollow profile blank in combination with a rotatably mounted or preferably actively driven bending mold.

According to a further embodiment of the method according to the invention, the hollow profile blank is guided by using a guide sleeve, which is axially adjustable, for example, and an inner mandrel shaft during the relative movement of hollow profile blank and annular gap tool, so that a further increase in process reliability is achieved. In this case, the inner die of the annular gap tool, which is usually held via a mandrel tie rod, can be fastened to the mandrel shaft of the guide sleeve. To simplify the technical structure, the outer die of the annular gap tool can be connected to the guide sleeve.

Preferably, the annular gap inlet and the annular gap outlet also have inflow or outflow curves, which simplify the friction or also the threading of the hollow profile blank into the annular gap tool. In addition, the dies used or the bending mold or even the active surfaces of the dies or the bending mold and optionally the bending mandrel can be made, for example, from hard metal, hardened steel, metal ceramics or similar metals. These lead to a reduced wear of the dies and bending forms used.

Preferably, the introduction of the variable-position, longitudinally oriented formations in the hollow profile by a driven rotation of the outer die of the annular gap tool can be performed using a drive unit. In this case, the inner die is preferably freely rotatably mounted on a mandrel tie rod, so that it can follow the rotation of the outer die. In this case, the bending mold can be freely rotatably mounted to follow the formation, which has been introduced by the annular gap tool in the hollow profile blank. The bending mold can be arranged freely rotating or, alternatively, be rotatable about its longitudinal axis, for example by means of a motor drivable. This can have an advantageous effect on the control possibility, for example, on complex bending geometries, in particular on three-dimensional bending geometries or support their generation. When using a profile feed unit, this can hold the reshaped hollow section blank via a frictional connection and / or a form fit, preferably preferably for relief, the optionally provided guide sleeve with the outer die of the annular gap tool, for example, simultaneously and simultaneously rotates and, for example, axially adjustable. In order to maintain the dimension of the annular gap, it is advantageous that in an axial adjustment of the outer die and the inner die on the mandrel tie rod is adjusted in the same dimensions.

In addition, lunettes can be arranged downstream of the profile feed unit in order to support the hollow profile blank, in particular if it projects significantly beyond the guide sleeve at the beginning of the forming process.

In order to obtain a particularly great flexibility with respect to the radius of curvature of the curved hollow profile according to another embodiment of the method according to the invention, it is advantageous if the bending mold during the forming process, ie during the implementation of translational relative movement between the hollow profile blank and annular gap tool or bending mold, the Bending form and optionally the bending mandrel are freely adjustable in their angle to the axial axis of the hollow section blank. The bending mandrel, which is usually equipped with articulated segments, especially for small bending axes, can easily follow the set angle to the axial axis of the hollow profile blank. For larger bending radii also simple and conventional bending mandrels can be used.

According to a further advantageous embodiment of the method according to the invention, the hollow profile produced according to the invention is part of a vehicle body, an A-pillar with subsequent roof frame of a motor vehicle or a profile of a stairlift chair guide. Corresponding hollow profiles, which can be used for any application in which storable, longitudinally oriented formations play a decisive role, can be produced in a simple manner with the method according to the invention and are therefore correspondingly inexpensive to produce.

• ein Formgebungswerkzeug, welches am Eingang die Querschnittsform des Profil- oder Hohlprofilrohlings und am Ausgang die Querschnittsform des Profils oder Hohlprofils mit mindestens einer längsorientierten Ausformung aufweist,
• Mittel zur Durchführung einer Relativbewegung in Axialrichtung zwischen dem Formgebungswerkzeug und dem Profil- oder Hohlprofilrohling, bevorzugt eine Profilvorschubeinheit und umfassend
• Mittel zur Durchführung einer relativen Drehung um die Axialachse des Formgebungswerkzeugs gegenüber dem Profil- oder Hohlprofilrohling oder um die Axialachse des Profilrohlings, insbesondere Hohlprofilrohlings gegenüber dem Formgebungswerkzeugs.

According to the present invention, an apparatus is used for the simplified production of profiles, in particular hollow profiles with a positionally variable, longitudinally oriented formation comprising:

• a shaping tool which has at the entrance the cross-sectional shape of the profile or hollow profile blank and at the outlet the cross-sectional shape of the profile or hollow profile with at least one longitudinally oriented formation,
• Means for performing a relative movement in the axial direction between the forming tool and the profile or hollow profile blank, preferably a profile feed unit and comprising
• Means for performing a relative rotation about the axial axis of the forming tool relative to the profile or hollow profile blank or about the axial axis of the profile blank, in particular hollow profile blank relative to the forming tool.

The device according to the invention can be improved according to a first embodiment in that a bending mold with an optional bending mandrel is provided at the outlet of the forming tool. Curved profiles or hollow profiles with a longitudinally oriented, positionally variable shape can then also be produced with the device which is further configured according to the invention.

• ein Ringspaltwerkzeug mit einem inneren und einem äußeren Gesenk, welche einen Ringspalt, einen Ringspalteingang und einen Ringspaltausgang bilden, wobei der Ringspalt am Ringspalteingang die Querschnittsform des Hohlprofilrohlings und am Ringspaltausgang die Querschnittsform des Hohlprofils mit mindestens einer lageveränderlichen, längsorientierten Ausformung aufweist,
• eine Biegeform und optional einen Biegedorn, welche dem Ringspaltausgang des Ringspaltwerkzeugs nachgeordnet sind, wobei die Biegeform und optional der Biegedorn einen Ringspalt bilden und derart angeordnet sind, so dass eine Biegung des durch das Ringspaltwerkzeug umgeformten Hohlprofilrohlings erfolgt,
• Mittel zur Durchführung einer Relativbewegung in Axialrichtung zwischen dem Ringspalt des Ringspaltwerkzeugs, dem Ringspa.lt, welcher durch die Biegeform und optional den Biegedorn gebildet wird, und dem Hohlprofilrohling,
• Mittel zur Durchführung einer relativen Drehung um die Axialachse des Ringspaltwerkzeugs, der Biegeform und optional des Biegedorns gegenüber dem Hohlprofilrohling bzw. die Axialachse des Hohlprofilrohlings gegenüber dem Ringspaltwerkzeug und der Biegform und optional den Biegedorn.

According to a first embodiment of the device according to the invention, at least one longitudinally oriented, variable-profile shaping profiles or hollow profiles are made in a simplified manner from profile or hollow profile blanks produced by

• an annular gap tool with an inner and an outer die, which form an annular gap, an annular gap entrance and an annular gap exit, wherein the annular gap at the annular gap entrance has the cross-sectional shape of the hollow profile blank and at the annular gap exit the cross-sectional shape of the hollow profile with at least one positionally variable, longitudinally oriented formation,
• a bending mold and optionally a bending mandrel, which are arranged downstream of the annular gap outlet of the annular gap tool, wherein the bending mold and optionally the bending mandrel form an annular gap and are arranged such that a bending of the hollow profile blank formed by the annular gap tool takes place,
• Means for performing a relative movement in the axial direction between the annular gap of the annular gap tool, the Ringspa.lt, which is formed by the bending mold and optionally the bending mandrel, and the hollow profile blank,
• Means for performing a relative rotation about the axial axis of the annular gap tool, the bending shape and optionally the bending mandrel relative to the hollow profile blank or the axial axis of the hollow profile blank relative to the annular gap tool and the bending mold and optionally the bending mandrel.

With the device according to the invention it is possible to mold in one step in a hollow profile on the one hand a variable position, longitudinally oriented shape and at the same time bending the hollow profile. As a result, with the device according to the invention hollow profiles, for example, as they are provided for motor vehicles in the A-pillar or can also be used for the realization of chair guides a stairlift, are produced. As already stated, of course, for example, open profiles or partially closed profiles can be produced with a longitudinally oriented shape using this embodiment of the device according to the invention.

According to a further embodiment of the device according to the invention, the bending mold is arranged such that the angle between the axial axis of the bending mold and the axial axis of the annular gap tool for changing the radius of curvature of the profile or hollow profile before and / or during the forming is variably adjustable. This ensures that different radii of curvature can be realized in the profile or hollow profile to be produced.

As already stated above, a next embodiment of the device according to the invention ensures a particularly process-reliable and gentle forming process in that the annular gap of the annular gap tool is shaped such that during the introduction of the at least one formation in the hollow profile blank, the circumference of the hollow profile blank by a maximum of +/- 25 %, preferably by a maximum of +/- 15% changes. In particular, the forces necessary for the deformation can be minimized in this way. A simple positioning of the inner die of the annular gap tool is achieved in that a mandrel tie rod is provided.

For easy loading and unloading of the device according to the invention, it may be advantageous that the outer die of the annular gap tool is divided and can be opened. Preferably, in this case, the inner die of the annular gap tool has outer dimensions which are smaller than or equal to the inner dimensions of the hollow profile blank. Thus, the loading and unloading of the device can take place with a hollow profile blank from the side of the annular gap outlet, wherein the hollow profile blank is simply pushed over the inner die in the direction of the annular gap inlet with the outer die open until it is positioned in front of the annular gap inlet.

For example, the inner mandrel shaft may be formed integrally with the inner die of the annular gap tool. In particular, for easier loading and unloading partially preformed hollow profile blanks can be used.

If the outer die undivided, inner and outer die, for example using a mandrel tie rod, to be separated in the axial direction so that the hollow profile blank can be positioned via the inner die to the starting position in front of the annular gap entrance before the outer die again on the inner die is pushed to form the annular gap tool.

Furthermore, an adapted to the hollow profile blank printing or drawing piece may be provided which the hollow profile blank detected at one end of the end face and is able to push through the hollow section blank by the annular gap tool and possibly also by the bending mold or pull through. This ensures that the hollow profile blank is completely brought into the changed cross-sectional shape with at least one variable position, longitudinally oriented formation.

According to a next further developed embodiment of the device according to the invention a profile feed unit is provided with a profile feed carriage, so that the annular gap tool and / or the bending mold can be formed stationary at least in the axial direction. As a result, the structure of the device according to the invention is simplified. However, in order to facilitate the bending process, the bending mold can additionally be arranged in the axial direction, preferably movable via a drive.

Preferably, the outer and the inner die are axially adjustable in combination with the mandrel shaft and the guide sleeve. In order to produce particularly tight bending radii, it is advantageous to perform an axial adjustment of the above-mentioned component in the axial direction when deflecting the bending mold, for example by transverse adjustment and rotation.

Preferably, the profile shear unit can also be equipped with means for rotating the hollow profile blank, so that the relative axial rotation between the hollow profile blank and the annular gap tool for introducing the variable-position, longitudinally oriented formations in the hollow profile blank can be completely or partially provided by the profile feed unit.

Alternatively or cumulatively thereto, the device according to the invention can be configured advantageously in that the outer die of the annular gap tool and / or the bending die have a drive for axial rotation. Via a driven rotation of the outer die, it is possible to introduce a positionally variable, longitudinally oriented shaping into the hollow profile blank via a greater lever effect. The inner die of the annular gap tool can be freely rotatably mounted in this case, follow the rotation of the outer die without much effort. This also applies to the bending mold, which in the case of a motor drive additionally can achieve a defined deflection of the bending mold relative to the formations of the hollow profile blank with respect to the direction of curvature of the bending line, so that an evasion of the hollow profile from the set bending direction as a result of "oblique bending "is compensated.

According to a further embodiment of the device according to the invention, a guide sleeve and a mandrel shaft for guiding the hollow profile blank are arranged in front of the annular gap tool, wherein optionally the inner die of the annular gap tool is freely rotatably mounted on the mandrel shaft. As already stated above, the guide sleeve and the mandrel shank enable an improved guidance of the hollow profile blank and thus a higher process reliability during the forming. Instead of the mandrel tie rod, the inner die can be easily attached to the mandrel shaft. In order to follow the rotation of the outer die, the inner die is preferably rotatably attached to the inner mandrel shaft. It is also preferable that the bending mandrel is rotatable at the exit of the annular gap tool on the inner die is fixed so that it can follow the rotation of the formations of the hollow profile in the case of a rotatable outer die.

Additionally or alternatively, lunettes can also provide support for the hollow profile blank, which are preferably arranged between the profile feed unit and the annular gap tool.

According to a further embodiment of the device according to the invention, the active surfaces of the outer and inner die of the annular gap tool and optionally the active surfaces of the bending mold and / or optionally of the bending mandrel are made of e.g. hardened steel, carbide, cermet or similar metals to optimize the forming process and to minimize wear.

Finally, the device can be further configured in that the annular gap tool, the bending mold with optional bending mandrel, the means for carrying out the relative movement between the hollow profile blank and annular gap tool, the means for rotating the outer die of the annular gap tool and optionally a profile feed unit and a guide sleeve on a profile bending machine are. Profile benders usually have recordings for profile feed units and bending forms. In this respect, profile bending machines can be equipped with little effort for carrying out the method according to the invention and for providing a device according to the invention.

In a further embodiment, the inner die between the mandrel shaft and mandrel balls of a preferably used mandrel is articulated introduced. A drive adjusts the axial position of the inner die relative to the outer die via the mandrel connected to the mandrel shank of the mandrel to maintain the annular gap. In this configuration, the mandrel balls are inevitably adjusted together with the inner die.

In another embodiment, inner die and mandrel ball can be axially positioned independently of each other. This could be realized, for example, via a two-part mandrel rod, according to the tube-in-tube principle or else by an actuator in the mandrel shaft. This configuration has the advantage that both the inner die for the annular gap and the mandrel balls for an optional position for the inner support in the area of the bending mold can be positioned independently of each other.

In a further embodiment may be made in one piece to simplify the device of the mandrel shaft and the inner die. It is then advantageous that this unit is freely rotatably mounted to follow the rotation of the outer die.

Fig. 1

eine schematische Draufsicht auf den Ringspaltausgang eines Ausführungsbeispiels eines Ringspaltwerkzeugs,

Fig. 2

das Ringspaltwerkzeug aus Fig. 1 in einer perspektivischen Ansicht,

Fig. 3

in einer Schnittansicht ein Vergleich zwischen der Querschnittsform eines Hohlprofilrohlings gemäß eines weiteren Ausführungsbeispiels und des umgeformten Hohlprofilrohlings mit mindestens einer längsorientierten Ausformung,

Fig. 4

das Ausführungsbeispiel eines Ringspaltwerkzeugs aus Fig. 1 mit vorgelagerter Führungshülse und Dornschaft gemäß einem weiteren Ausführungsbeispiel des Ringspaltwerkzeugs in einer axialen, schematischen Schnittansicht,

Fig. 5

in einer perspektivischen, schematischen Ansicht das Ausführungsbeispiel aus Fig. 4 inklusive Biegeform und Biegedorn,

Fig. 6

eine schematische Draufsicht einer erfindungsgemäßen Profilbiegemaschine umfassend ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung,

Fig. 7a) bis

d) in einer perspektivischen, schematischen Darstellung ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens zu verschiedenen Zeitpunkten unter Verwendung der Vorrichtung aus Fig. 5,

Fig. 8

in einer perspektivischen, schematischen Darstellung ein hergestelltes, gebogenes Hohlprofil mit tordierter Ausformung,

Fig. 9

in einer schematischen, perspektivischen Darstellung ein Stuhlführungsprofil eines Treppenlifts in einem Treppenhaus und

Fig. 10

eine schematische Darstellung einer A-Säule eines Kraftfahrzeugs.

In addition, the invention will be explained in more detail using an exemplary embodiment in conjunction with the drawing. The drawing shows in

Fig. 1

FIG. 2 is a schematic plan view of the annular gap outlet of an embodiment of an annular gap tool, FIG.

Fig. 2

the annular gap tool Fig. 1 in a perspective view,

Fig. 3

3 is a cross-sectional view of a comparison between the cross-sectional shape of a hollow-section blank according to a further exemplary embodiment and the formed hollow profile blank with at least one longitudinally oriented formation,

Fig. 4

the embodiment of an annular gap tool Fig. 1 with upstream guide sleeve and mandrel shaft according to a further embodiment of the annular gap tool in an axial, schematic sectional view,

Fig. 5

in a perspective, schematic view of the embodiment Fig. 4 including bending form and bending mandrel,

Fig. 6

a schematic plan view of a profile bending machine according to the invention comprising an embodiment of a device according to the invention,

Fig. 7a) to

d) in a perspective, schematic representation of an embodiment of the inventive method at different times using the device from Fig. 5 .

Fig. 8

in a perspective, schematic representation of a manufactured, curved hollow profile with twisted shape,

Fig. 9

in a schematic, perspective view of a chair guide profile of a stair lift in a staircase and

Fig. 10

a schematic representation of an A-pillar of a motor vehicle.

Fig. 1 and Fig. 2 show in each case different views of an embodiment of a forming tool in the form of an annular gap tool 1, which consists of an outer die 2 and an inner die 3. Both dies 2, 3 form an annular gap 4, which changes from the annular gap entrance 5 to the annular gap exit 6 in its cross-sectional shape from the cross-sectional shape of the hollow profile blank, in this case a circular cross-sectional shape, to the cross-sectional shape of the hollow profile with longitudinally oriented recess. In Fig. 1 is clearly seen in comparison to the initial cross-sectional shape changed cross-sectional shape of the annular gap 4. The width of the annular gap 4 is greater than or equal to the wall thickness of the hollow profile blank to be formed. At the annular gap inlet 5 and at the annular gap outlet 6 inlet and outlet areas are provided which have inlet and outlet curves. This facilitates the threading of the hollow section blank For example, in the annular gap entrance 5 and the leakage of the deformed hollow section blank at the annular gap exit 6. A short area at the annular gap entrance 5 and at the annular gap exit 6 performs no change in shape of the hollow profile blank, so that these areas stabilizing effect for the forming process. The annular gap tool 1 can therefore be used both according to the first aspect of the present invention for the production of hollow profiles with variable position, longitudinally oriented formations as well as for the production of curved hollow profiles with variable position, longitudinally oriented formations.

Compared to the previously known prior art, in which a screw-shaped groove having inner die a variable position, in particular twisted shape is introduced into a hollow profile, as for example in the patent DE 38 07 002 C1 is disclosed, in the inventive introduction of a variable position, in particular twisted shaping only the outer die 2 is rotated relative to the hollow profile about its axial axis, so that on the one hand the inner die 3 follows the rotation of the outer die and the hollow profile blank of the initial shape, for example, here circular , Is brought to a final shape with variable-position, in particular longitudinally oriented formations, as here two opposite longitudinally oriented recesses relative to the circular shape.

In contrast to the known prior art, the illustrated embodiment of an annular gap tool is constructed much simpler and can softer shape transitions have, so that a transformation of a hollow section blank to a hollow profile with variable position, longitudinally oriented formations can be done in a simple manner and without large forming forces. In particular, it is possible with the method and apparatus according to the invention to actively control the pitch of the longitudinally oriented, variable-position formation ("turns") via the time-varying rotation of the outer die.

Preferably, during the deformation of the hollow profile blank with the annular gap tool 1, the circumference of the hollow profile blank does not change. It follows that the length of the neutral fiber, i. the center line of the sheet thickness of the hollow section blank does not change at all or only within narrow limits preferably +/- 25% or more preferably +/- 15%. The forming work taking place in the sheet metal plane is thereby minimized, so that the forming forces can be further reduced.

Fig. 3 shows in a schematic sectional view of the starting cross-sectional shape 7 of the hollow profile blank and the cross-sectional shape 8 of the hollow profile blank after leaving the annular gap tool. The circumferential length of the two cross-sectional shapes 7, 8 is identical, so that no work in the sheet thickness plane through the annular gap tool must be made.

Fig. 4 , now shows one opposite the Fig. 1 and 2 further improved variant of the annular gap tool 1 with upstream guide sleeve 9 and inner mandrel shaft 10 in an axial sectional view. Clearly visible at the annular gap tool 1 at the annular gap input 5 and on Ring gap output 6 input and output areas 5a, 6a, which no change in shape in the hollow section blank, which in Fig. 4 also not shown, cause. Because the hollow section blank, in Fig. 4 not shown, between the mandrel shaft 10 and guide sleeve 9 is performed, the forming process and the introduction of variable position, longitudinally oriented formations in the hollow section blank can be made even more process-reliable.

In the Fig. 4 Guide sleeve 9 shown here preferably rotates with to additionally support the introduction of the variable-position, longitudinally oriented formations through the annular gap tool. Either the guide sleeve 9 is freely rotatably mounted or can be actively rotated by means of a drive or alternatively be executed by means of a braking device fixed or controlled rotating. Alternatively, the guide sleeve 9 may also be formed non-rotatable.

In order to produce now a curved hollow profile with variable position, longitudinally oriented formations, which is in the Fig. 1 to 4 illustrated embodiment of an annular gap tool with guide sleeve 9 in addition to a bending mold 11 together with mandrel 12 supplements. As can be seen, this points in Fig. 5 illustrated embodiment of an inventive device for producing curved hollow profiles with variable position, longitudinally oriented formations an annular gap tool 1, which comprises an outer die 2 and an inner die 3, which form an annular gap 4, which in the initial cross-sectional shape of a hollow profile blank at least one longitudinally oriented formation, in this case two opposite . introduces longitudinal orientations. The downstream bending mold 11 and the bending mandrel 12, which is preferably constructed of articulated segments, also form an annular gap 13, which has the final shape of the formed hollow profile blank. The width of the annular gap 13 is also greater than or equal to the wall thickness of the hollow section blank. Preferably, the bending mold 11 with its axial axis at an angle to the axial axis of the annular gap tool 1 and the guide sleeve 9 occupy. In this case, the deformed hollow profile emerging from the annular gap tool 1 is bent over the bending mold. The bending mold 11 follows as well as the bending mandrel 12 of the introduced, variable-position formations of the hollow profile. It is also conceivable to actively drive the bending mold. If the angle of the axial axis of the bending mold 11 relative to the axial axis of the annular gap tool 1 is increased, the curvature of the hollow profile is increased and the bending radius of the hollow profile is reduced. In this respect, with the method according to the invention, any radii of curvature can be generated in the longitudinal direction of the hollow profile to be produced, despite the positionally variable, longitudinally oriented formations of the hollow profile.

Fig. 6 shows a schematic sectional view of a further embodiment of a device according to the invention with an annular gap tool 1, a bending mold 11, a bending mandrel 12 and means 14 for performing a relative movement in the axial direction between the annular gap of the annular gap tool 1, the annular gap 13, which through the bending mold 11 and the Bending mandrel 12 is formed and the hollow profile blank 16. The means 15 for performing a relative movement in the axial direction of the hollow section blank 16th are provided by a profile feed unit 15 in the illustrated embodiment.

As the arrow indicates, the profile feed unit 15 can perform a translatory movement in order to move or guide the hollow profile blank 16 as continuously as possible relative to and through the annular gap tool 1. In addition, the deformed hollow section blank 16 is moved further in the direction of the bending mold 11 and the bending mandrel 12 and bent with introduced, variable position, longitudinally oriented formation. Additionally shown in Fig. 6 the guide sleeve 9 and the inner mandrel shaft 10. The bending mold 11 is preferably arranged so that any angle α can be adjusted relative to the axial axis of the annular gap tool 1 and the hollow profile blank before bending.

The angle α can be adjusted in any direction perpendicular to the axial axis of the annular gap tool. As indicated by the arrows on the annular gap tool 1 and on the bending mold 11, the bending mold 11 rotates synchronously with the annular gap tool 1 so that the bending mold 11 can each follow the formations introduced into the hollow profile. In Fig. 6 the bending mandrel 12 is segmented. The individual segments are preferably connected to one another like an articulation, so that the latter can follow the bending angles which the bending form 11 assumes with respect to the axial axis of the annular gap tool. In addition, the bending mandrel 12 is preferably rotatably attached to the inner tool 3 of the annular gap tool 1.

The means for performing a relative rotation about the axial axis of the annular gap tool, the bending shape relative to the hollow profile blank are in Fig. 6 represented schematically by the reference numerals 17 and 18. Alternatively or in addition to the rotation of the profile feed unit 15, they can ensure a relative axial rotation between the annular gap tool 1 and the bending mold 11 and the hollow profile blank 16. In addition, a specifically designed pressure part 15a is indicated, which allows the hollow profile blank 16 can be completely transformed in its cross-sectional shape.

Preferably, the device just described is arranged on a profile bending machine 19, Fig. 6 , Profile bending machines 19 usually already have means for setting a bending angle and for carrying out translational movements, for example a profile feed unit 15. Profile bending machines 19 can therefore be equipped in a simple manner with the device according to the invention.

In addition to supporting the leadership of the hollow section blank 16 are in Fig. 6 Lunettes 20 shown, which support the hollow profile blank 16 from the outside. Other suitable proppant can be used. If the profile feed unit 15 moves in the direction of the annular gap tool 1, it presses the hollow profile blank 16 through the annular gap of the annular gap tool 1. Through the annular gap 4 of the annular gap tool 1 of the hollow section blank 16 is formed. If the outer die of the annular gap tool 1 rotates while the profile feed unit 15 moves the hollow profile blank 16 relative to the position of the annular gap tool 1, a positionally variable, longitudinally oriented formation 23 is rotated into the Hollow section blank 16 introduced. At the annular gap exit, the at least one formation exhibits hollow profile 21 and runs directly into the bending mold 11, which likewise follows the rotation of the annular gap tool via the means 17. The bending mold 11 bends the incoming hollow section 21 according to the set bending angle α to a bent hollow section 22, which has variable position, in particular longitudinally oriented formations 23.

The individual process steps are in Fig. 7 represented according to an embodiment. In the Fig. 7a ) to d) is a guide sleeve 9, the annular gap tool 1 and the bending mold 11 together with bending mandrel 12 shown in perspective. The introduced from the left side into the guide sleeve hollow section blank 16 has, as shown in the present embodiment, a circular output cross-section. In Fig. 7b ), the hollow profile blank 16 as far as through the guide sleeve 9, the annular gap tool 1 and the bending mold 11 is moved so that it emerges on the bending mold 11 with the introduced formations 23 as a deformed hollow section 22.

mit z(t): Profilvorschub in Axialrichtung.If the bending mold 11 is now changed in its angle α to the axial axis of the hollow profile blank 16 or the annular gap tool 1, this leads, as in Fig. 7c If the annular gap tool 1 is rotated about its axial axis, the bending mold 11 follows the introduced formations, so that again a changed bending angle is adjustable. In Fig. 7d ), the forming process is almost complete, only a small residual area of the hollow section blank has yet to be transformed. This is usually done by not having one profile feed unit 15 shown comprises a pressure piece 15a, which can press the hollow profile blank completely through the annular gap tool. This ensures that the hollow profile produced over its entire length has introduced via the annular gap tool moldings. It is clear in Fig. 7d ) to recognize that the protrusions 23 are twisted varying over the length of the hollow profile produced. As can be seen from the figures just described, the relative rotation of the annular gap tool ψ relative to the hollow profile blank is to be defined as a function of the profile advance and thus of the time to achieve almost any positional changes of the formations. The following applies: $$\mathrm{\psi }\mathrm{=}\mathrm{f}\left(\mathrm{z}\left(\mathrm{t}\right)\right)\mathrm{.}$$

with z (t): profile feed in the axial direction.

With this function, the relative rotation of the outer die can be controlled to obtain the desired course of the formations in the hollow profile.

A curved hollow profile with variable position, longitudinally oriented recesses 23 shows Fig. 8 in a schematic, perspective view. This in Fig. 8 shown, curved hollow profile with longitudinally oriented formations 23 may, for example, as a profile for chair guidance of a stair lift 24, as it is for example in Fig. 9 is shown used. Another use of the hollow section 22 shows Fig. 10 schematically in a side view of a vehicle body. The A-pillar 25, which also forms part of the roof frame, has Usually also variable-position, longitudinally oriented formations, on the one hand to meet the stability requirements of an A-pillar and the stability requirements of the roof frame. The use of a single hollow section 25 for an A-pillar including roof frame part simplifies the production of vehicle bodies.

Claims (15)

Method for producing profiles (22) having at least one positionally variable, longitudinally oriented formation (23) from a profile blank (16), comprising the following method steps: Providing a shaping tool which has the cross-sectional shape of a profile or hollow-section blank at the entrance and a modified cross-sectional shape with at least one shape at the exit, Positioning the profile or hollow profile blank (16) at the entrance of the forming tool, - Performing a relative movement in the axial direction between the forming tool and the profile or hollow profile blank while performing a relative rotation between the forming tool and the profile or hollow profile blank about an axial axis of the forming tool, the profile or hollow profile to a variable-position molding on the forming tool in the Profile or hollow profile blank to bring. Method according to claim 1,
characterized in that the forming tool exiting reshaped profile or hollow profile using a downstream Bending mold (11) with an optional bending mandrel (12) is bent. Method according to claim 1 or 2,
characterized in that the following method steps are included: - Providing a than annular gap tool (1) formed forming tool with an outer and an inner die (2,3), which form an annular gap (4), an annular gap entrance (5) and an annular gap outlet (6), wherein the annular gap (4) on Annular gap entrance (5) has the cross-sectional shape of a hollow profile blank (16) and at the annular gap outlet (6) has the cross-sectional shape of the hollow profile (22) with at least one longitudinally oriented, variable-position formation (23), wherein the width of the annular gap (4) is greater than or equal to the wall thickness of the hollow section blank (16), - Providing a bending mold (11) and optionally a bending mandrel (12), which are arranged downstream of the annular gap tool (1) and an annular gap (13) for bending the in the annular gap tool (1) formed hollow profile blank, wherein the width of the annular gap (13) is greater than or equal to the wall thickness of the hollow section blank (16), Positioning the hollow profile blank (16) at the annular gap entrance (5), - Performing a relative movement in the axial direction between the annular gap (4) of the annular gap tool (1), the annular gap (13), which is provided by the bending mold (11) and optionally the bending mandrel (12), and the hollow profile blank (16) with simultaneous relative axial rotation of the outer die (2) of the annular gap tool relative to the hollow profile blank (16), Bending the reshaped hollow profile (22) emerging at the annular gap outlet (6), using the bending mold (11) and the optional bending mandrel (12), which by a relative axial rotation during the bending operation of the position of the at least one formation (23) in the formed hollow section blank (16) follow. Method according to claim 3,
characterized in that the hollow profile blank (16) in an inlet region (5a) of the annular gap inlet (5) and / or in an outlet region (6a) at the annular gap outlet (6) is not changed in its shape during the relative movement. Method according to claims 1 to 4,
characterized in that the relative movement between profile or hollow profile blank (16) and the forming mold (1) and the bending mold (11) by advancing the profile or hollow profile blank (16) using a profile feed unit (15) is performed. Method according to claim 5,
characterized in that the profile or hollow profile blank (16) during the Profile feed, optionally using the profile feed unit (15) is rotated. Method according to one of claims 1 to 6,
characterized in that the profile or hollow profile blank (16) using a guide sleeve (9) and an inner mandrel shaft (10) during the relative movement of profile or hollow profile blank (16) and shaping tool (1) is guided. Method according to one of claims 1 to 7,
characterized in that the profile or hollow profile produced part of a vehicle body, an A-pillar (25) with adjoining roof frame of a motor vehicle or a profile or hollow profile of a stairlift chair guide (24). Device for the production of profiles or hollow profiles (22) with at least one positionally variable, longitudinally oriented formation of a profile or hollow profile blank (16), in particular for carrying out a method according to one of claims 1 to 8 comprising: a forming tool having at the entrance the cross-sectional shape of the profile or hollow profile blank and at the outlet the cross-sectional shape of the profile or hollow profile with at least one longitudinally oriented formation, - Means for performing a relative movement in the axial direction between the forming tool and the profile or hollow profile blank, preferably a profile feed unit and comprising - Means for performing a relative rotation between the forming tool and the profile or hollow profile blank about an axial axis of the forming tool, the profile or hollow profile. Device according to claim 9,
characterized in that at the output of the forming tool, a bending mold (11) with an optional bending mandrel (12) is provided. Device according to claim 9 or 10,
characterized in that the device comprises a forming tool designed as an annular gap tool (1), having an inner and an outer die (2, 3), which form an annular gap (4), an annular gap entrance (5) and an annular gap exit (6), the annular gap (4) on Annular gap inlet (5) the cross-sectional shape of the hollow profile blank (16) and at the annular gap outlet (6) has the cross-sectional shape of the hollow profile (22) with at least one longitudinally oriented, variable-position formation (23), - A bending mold (11) and optionally a bending mandrel (12), which are arranged downstream of the annular gap outlet (6) of the annular gap tool (1), wherein the bending mold (11) and optionally the bending mandrel (12) form an annular gap (13) and are arranged such that a bending of the hollow profile blank (16) formed by the annular gap tool takes place, - means (15) for performing a relative movement in the axial direction of the annular gap tool (1) between the annular gap (4) of the annular gap tool (1), the annular gap (13), which is formed by the bending mold (11) and optionally the bending mandrel (12) , and the hollow profile blank (16), - Means (17,18) for performing a relative rotation of the annular gap tool (1) and the bending mold (11) about the axial axis relative to the hollow profile blank (16). Device according to one of claims 10 or 11,
characterized in that the bending mold (11) is arranged such that the angle (α) between the axial axis of the bending mold (11) and the axial axis of the forming tool (1) for changing the radius of curvature of the profile or hollow profile before, after and / or during of the forming is variably adjustable. Device according to one of claims 9 to 12,
characterized in that the outer die (2) of the annular gap tool (1) and / or the bending mold (11) have a drive for axial rotation. Device according to one of claims 9 to 13,
characterized in that a guide sleeve (9) and a mandrel shaft (10) for guiding the hollow profile blank (16) in front of the forming tool (1) are arranged, wherein optionally the inner die (3) of the annular gap tool (1) freely rotatably on the mandrel shaft (10 ) is attached. Device according to one of claims 10 to 14,
characterized in that the forming tool (1), the bending mold (11) with optional bending mandrel (12), the means (15) for carrying out the relative movement between profile or hollow profile blank (16) and forming tool (1), the means (18) for rotation of the forming tool and optionally a profile feed unit (15) and a guide sleeve (9) on a profile bending machine (19) are arranged.

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