DE102018106978A1 - Device and method for bending wire for the production of machine elements of electrical machines, in particular for creating a jump bend - Google Patents

Abstract

A device (100) and a method for bending wire for the production of machine elements of electrical machines comprises a first clamping unit (21) and a second clamping unit (22), which are arranged side by side and aligned in a direction P parallel to one another. Therein a wire (1) is fixed. With a drive unit, the clamping units (21, 22) are moved parallel to each other to deform the wire (1) in a wire region (1a). The displacement occurs in a direction V obliquely to the direction P of the parallel alignment of the clamping units (21, 22).

Description

The invention relates to a device for bending wire for the production of machine elements of an electrical machine. Furthermore, the invention relates to a method for bending wire for the production of machine elements of an electrical machine. The apparatus and method are particularly suitable for providing a jump bend in the manufacture of hairpins for stators of electric motors.

Electrical machines are understood in particular as machines for converting electrical energy into kinetic energy and machines for converting kinetic energy into electrical energy. In particular, these include electric motors and generators.

For the manufacture of machine elements of such electrical machines, such as stators or rotors, in many cases it is necessary to form, connect, cut, or otherwise process electrically conductive wires. The wire may in particular also have a rectangular cross-section, be configured as a flat, square or profile wire, or for example as flat strip steel or the like.

In the production of electric motors for motor vehicles, production methods are mostly used which enable particularly economical production of powerful components for electric motors. This includes in particular the hairpin procedure. In this case, coil windings, in particular of the stator, formed from a plurality of pieces of wire whose ends are connected together. For example, describe the EP 2684283B1 , the EP 1554794B1 and the EP 1041696B1 Devices and methods for connecting wire ends of hairpins for forming stator windings of electrical machines in which the wire ends are welded together.

The manufacturing process of the electric motors is preceded by the manufacturing process of the individual hairpins. The individual, electrically conductive hairpins are then packed as closely as possible and welded to a continuous electrically conductive winding.

Starting material for the production of hairpins is usually a copper wire, which is usually provided with an insulating layer. This may in particular be a rectangular wire with rounded edges.

The geometry of the hairpins to be produced is not fixed but depends on the respective electric motor. In addition, various types of hairpins having different geometrical dimensions are needed in the manufacture of an electric motor.

The hairpins usually have a so-called roof shape. That is, the wire is bent so as to have two legs that are substantially parallel to each other and connected to each other on one side via a roof-shaped part of the wire.

An example of a hairpin is in 2 shown. This has several angles, from which the roof shape results, which is also referred to as a house roof shape. The angles and leg lengths can vary depending on the required shape. Furthermore, it is necessary, depending on the requirement, to produce hairpins with different wire cross sections or to process wires with different cross sections.

When manufacturing stators using hairpin technology, a variety of hairpins are put together. In order to keep the installation space as small as possible when plugging in a stator with hairpin technology and thereby obtain the required plug-in patterns, it is necessary to bend the wires so that they nest as closely as possible. This is achieved by a small offset in the roof shape of the wire or hairpin. This bend is called a jump or a jump bend.

So far, the bending of the offset or jump is accomplished, for example, by a hand device. The wire is firmly clamped on one side and bent upwards over a defined bending edge and the corresponding angle. Then an anvil is delivered and the bent leg is bent back over the anvil, which serves as a new bending edge. This creates a parallel offset in the wire.

It is the object of the invention to provide a device and a method for bending wire, which in a wire, in particular in the form of a hairpin or with a roof bend, an offset or jump can be formed as quickly as possible, with a high degree Flexibility is to be achieved.

To achieve this object, the invention provides a device for bending wire for the production of machine elements of electrical machines, comprising a first clamping unit and a second clamping unit, the side by side arranged and in one direction P aligned parallel to each other, for fixing a wire; a drive unit which shifts the second clamp unit with respect to the first clamp unit to deform the wire in a wire section located between the two clamp units; being the shift in one direction V diagonally to the direction P the parallel alignment of the clamping units takes place.

As a result, wires or hairpins can be provided in a fast and flexible manner with an offset or jump, so that the space of the component to be manufactured is kept low. In particular, with the device, the jump or offset can be generated in both directions, for example, up and down or front and back, and variable jump heights.

Advantageously, the two clamping units are arranged so that their mutual distance is reduced, while they are displaced to deform the wire while maintaining its parallel orientation.

For example, at least one of the two clamping units has a shaping surface for shaping the wire region located between the two clamping units.

In particular, the molding surface may be oriented obliquely to a plane in which the wire is fixable for bending.

For example, the forming surface may be arranged to press against the forming surface during displacement of the wire portion located between the two clamping units.

By way of example, when the clamping units are pushed together with an opposing mold surface, the mold surface forms a clamping plane which is oriented obliquely to the plane in which the wire can be fixed for bending.

In particular, the first clamping unit can be fixedly mounted and the second clamping unit can be mounted linearly movable on a guide.

Advantageously, the angle between the direction of displacement and the direction P the parallel orientation of the clamping units adjustable.

The displacement may, for example, have a movement component parallel and a movement component perpendicular to a plane in which the wire can be fixed in the clamping units.

In particular, the clamping units can be displaced relative to one another in two opposite directions in order to allow deformation of the wire in two directions.

In particular, the clamping units can be designed such that they fix the wire in a first position in a plane, and are offset in a second position relative to each other, so that the wire extends over two different planes.

For example, the clamping units are designed as grippers, each comprising two opposing gripping jaws for clamping the wire.

In particular, the clamping units each comprise two opposing, mutually parallel clamping surfaces for clamping the wire.

Advantageously, the device is configured such that the drive unit comprises a ball screw, and / or the drive unit comprises a servo drive, and / or a bending axis for bending the wire is adjustable to a predetermined value of the shortening of the wire during bending, and / or one or several arcuate slots are provided for adjusting the bending axis.

According to another aspect of the invention, there is provided an apparatus for bending wire for the manufacture of machine elements of electrical machines, comprising a first clamping unit and a second clamping unit arranged side by side to receive a wire in the opened state so as to pass through both Clamping units extends, wherein the two clamping units are shifted from each other in such a way that the wire is deformed by closing the two clamping units in a located between the two clamping units wire area.

In particular, at least one of the two clamping units can have a shaping surface for shaping the wire region located between the two clamping units when the clamping units are closed.

For example, the molding surface may be oriented obliquely to a plane that serves to receive the wire in the clamping units. It can also be arranged so that when closing the clamping units of the wire located between the two clamping units wire area is pressed against the mold surface. In particular, the mold surface when closing the clamping units with an opposite mold surface a clamping plane form, which is oriented obliquely to the plane in which the wire is fixable to bending.

Advantageously, the clamping units are designed such that in the closed state their terminal planes are offset relative to each other, so that the wire extends over two different levels. They may, for example, be configured as grippers, each of which comprises two opposing gripping jaws for clamping the wire. The clamping units may each comprise two opposing, mutually parallel clamping surfaces for clamping the wire, and / or in one direction P be aligned parallel to each other.

• - Fixieren des Drahts in zwei nebeneinander liegenden Klemmeinheiten, die in einer Richtung P parallel zueinander ausgerichtet sind;
• - gegenseitiges Verschieben der Klemmeinheiten, um den Draht in einem zwischen den beiden Klemmeinheiten gelegenen Drahtbereich zu verformen, wobei die Verschiebung in einer Richtung V erfolgt, die schräg zur Richtung P der parallel ausgerichteten Klemmeinheiten verläuft.

According to one aspect of the invention, there is provided a method for bending wire for the manufacture of machine elements of electrical machines, comprising the steps of:

• - Fixing the wire in two adjacent clamping units, in one direction P are aligned parallel to each other;
• - Mutual displacement of the clamping units to deform the wire in a located between the two clamping units wire area, wherein the displacement in one direction V done, which is oblique to the direction P the parallel aligned clamping units runs.

For example, the mutual distance of the clamping units is reduced while they are displaced relative to each other while maintaining their parallel alignment.

Advantageously, the wire region located between the two clamping units is shaped during bending by at least one molding surface.

Advantageously, the wire portion is formed in a plane which is oriented obliquely to a plane in which the wire is fixed for bending. It can also be pressed against a forming surface during displacement, and / or pressed in displacement from two opposite sides into a plane which is oriented obliquely to the plane in which the wire is fixed for bending.

Preferably, the second clamping unit is moved linearly while the first clamping unit is fixed.

In particular, the angle between the direction V the shift and the direction P is set to a predefined value. For example, the displacement takes place with a movement component in parallel and a movement component perpendicular to a plane in which the wire is fixed. For example, the displacement may be selected from one of two opposite directions. In particular, after the displacement, the wire may extend over two different, parallel planes.

• - Einlegen eines Drahts in zwei nebeneinander liegende, geöffnete Klemmeinheiten, so dass er sich durch beide Klemmeinheiten erstreckt, wobei die beiden Klemmeinheiten derart angeordnet sind, dass in ihrem geschlossenen Zustand ihre Klemmebenen gegeneinander verschoben sind,
• - Verformen des Drahts in einem zwischen den beiden Klemmeinheiten gelegenen Drahtbereich durch Schließen der Klemmeinheiten.

According to another aspect of the invention, there is provided a method of bending wire for the manufacture of machine elements of electrical machines, comprising the steps of:

• Inserting a wire into two adjacent, open clamping units so that it extends through both clamping units, wherein the two clamping units are arranged such that in their closed state their clamping planes are shifted from one another,
• - Deformation of the wire in a region of wire located between the two clamping units by closing the clamping units.

In particular, the wire region located between the two clamping units can be formed by at least one forming surface during forming, and / or formed in a plane which is oriented obliquely to a plane into which the wire is inserted for bending.

For example, when the clamping units are closed, the wire area is pressed against a forming surface, and / or when the clamping units are closed, pressed into a plane which is oriented obliquely to the plane in which the wire is fixed for bending.

In particular, after closing the clamping units, the wire extends over two different planes oriented parallel to one another.

Advantageously, the method is carried out with the device according to the invention.

According to yet another aspect of the invention, there is provided a computer program for controlling a wire bending apparatus comprising program steps for carrying out the method of the invention.

Advantages and details which are mentioned in connection with the device according to the invention and the exemplary embodiments described below also apply to the method according to the invention and vice versa.

• 1 eine schematische Darstellung einer erfindungsgemäßen Vorrichtung zum Biegen von Draht als Ansicht von vorne;
• 2 ein Beispiel eines Hairpins in seiner hausdachförmigen Grundform als schematische Darstellung;
• 3 eine schematische Darstellung der erfindungsgemäßen Vorrichtung mit einer Antriebseinheit;
• 4a und 4b eine vergrößerte, schematische Darstellung eines Teilbereichs der Klemmeinheiten der erfindungsgemäßen Vorrichtung, wobei sich die Klemmeinheiten in einer Ausgangsposition A (4a) und in einer Biegeposition B (4b) befinden;
• 5a und 5b eine schematische Darstellung der erfindungsgemäßen Vorrichtung, wobei sich die Klemmeinheiten in einer Ausgangsposition A (5a) und in einer Biegeposition B (5b) befinden;
• 6a und 6b eine schematische Darstellung eines einzelnen Hairpins ( 6a) und einer Paarung von Hairpins (6b) mit einer Sprungbiegung als Ansicht von oben, d.h. in Blickrichtung auf das Dach.

Embodiments will be explained in more detail with reference to the accompanying drawings. It shows:

• 1 a schematic representation of a device according to the invention for bending wire as a front view;
• 2 an example of a hairpin in its house-roof-shaped basic form as a schematic representation;
• 3 a schematic representation of the device according to the invention with a drive unit;
• 4a and 4b an enlarged, schematic representation of a portion of the clamping units of the device according to the invention, wherein the clamping units in an initial position A ( 4a) and in a bending position B ( 4b) are located;
• 5a and 5b a schematic representation of the device according to the invention, wherein the clamping units in an initial position A ( 5a) and in a bending position B ( 5b) are located;
• 6a and 6b a schematic representation of a single hairpin ( 6a) and a pairing of hairpins ( 6b) with a bend as a view from above, ie in the direction of the roof.

1 shows a device 100 for bending wire according to a preferred embodiment of the invention. The device 100 has a first clamping unit 21 and a second clamping unit 22 on, which are both configured as a gripper or parallel gripper. The two grippers or clamping units 21 . 22 are arranged side by side and in one direction P aligned parallel to each other. They serve a wire 1 to be bent, to clamp or clamp so that the wire 1 centric in the device 100 is positioned and fixed.

During one of the two grippers, in this example the first clamping unit 21 , firmly mounted on a base unit, is the second clamping unit 22 movably mounted and can against the fixed first clamping unit 21 be moved. By the shift is in the wire 1 forced a plastic deformation.

The displacement of the second clamping unit 22 opposite the first clamping unit 21 takes place in one direction V , which diagonally to the direction P runs, in which the two clamping units 21 . 22 are aligned parallel to each other. By this arrangement, the distance between the two juxtaposed clamping units is reduced 21 . 22 if a sliding movement in the direction V he follows. The parallel alignment of the two clamping units 21 . 22 remains with the relative displacement of the two grippers or clamping units.

In the in 1 Example shown is the position of the clamping units 21 . 22 shown in mutually shifted state. By the shift in the direction V has an offset in the wire 1 educated. The clamping surfaces of the clamping units 21 . 22 are at different levels.

The grippers or clamping units 21 . 22 each have two opposing gripping jaws 21a . 21b respectively. 22a . 22b for pinching the wire 1 on. For this purpose, form the gripping jaws 21a . 21b respectively. 22a . 22b Clamping surfaces facing each other in pairs and aligned parallel to each other.

For shifting the second clamping unit 22 relative to the first clamping unit 21 is a drive unit 30 provided in 3 is shown. The drive unit 30 is to the device 100 coupled, which is a bending station for the wire 1 represents. The drive unit 30 has a servo drive 32 and a ball screw 31 on. That is, the bending device 100 the two clamping units 21 . 22 and a linear axis via the ball screw 31 is displaceable.

While one of the two clamping units, here the first clamping unit 21 , is firmly bolted to the unit or a base support is the other clamping unit, here the clamping unit 22 , linearly movable on a guide 25 , which is designed as a ball rail guide, mounted. That is, the slidable gripper and the second clamping unit 22 is mounted on a guide system and is in operation by the ball screw 31 against the fixed gripper or the first clamping unit 21 shifted, thereby causing a plastic deformation in the wire 1 to force.

About arched slots 41 can the bending axis on a theoretically determined cut value of the wire 1 to be adjusted when bending. When commissioning the device, the fine adjustment of the desired jump geometry is done via nonien. By a corresponding jaw geometry, radius and spout, the offset of the jump in the wire can 1 to be influenced.

About the ball screw 31 and the ball rail guide 25 is the by the servo drive 32 driven feed on the sliding clamping unit 22 transfer. About an adjustment, the angle of the guide 25 or the angle between the guide 25 and the direction P the parallel aligned clamping units 21 . 22 be changed (see 1 ). This allows the jump to be steeper or flatter.

The two clamping units 21 . 22 are mutually displaceable in two opposite directions. This may cause a deformation of the wire 1 done in two directions. The angle between the direction of displacement V and the direction P the parallel alignment of the two clamping units 21 . 22 is adjustable.

To explain further details show the 4a and 4b schematically the two clamping units 21 . 22 with their pairs of opposite jaws 21a . 21b respectively. 22a . 22b as well as the wire 1 , The clamping units are located in 4a in a first position A in which they are not shifted against each other while 4b shows a state in which the two clamping units 21 . 22 are shifted against each other and a second position B taking.

In the first position A , in the 4a is shown, the wire extends 1 straight through the two clamping units 21 . 22 and is between the opposite gripping jaws 21a . 21b such as 22a . 22b clamped. The clamping surfaces of the two clamping units 21 . 22 lie in a plane E1 respectively. E2 at the same level. The wire 1 is in unbent state.

In the position B , in the 4b is shown, the two clamping units 21 . 22 shifted against each other. Through the oblique to the parallel orientation B directed shift movement in the direction V (please refer 1 ) has the distance between the two clamping units 21 . 22 opposite the starting position A reduced and in wire 1 an offset was formed. In this state are the terminal levels E1 . E2 the two clamping units 21 . 22 at different levels or offset from each other, which is the offset in the wire 1 enforces that now in the wire area 1a is trained.

Due to the special contour of the gripping jaws 21a . 21b respectively. 22a . 22b desired or required bending radii can be achieved.

The clamping units 21 . 22 have mold surfaces 38a . 38b on, on the jaws 21a . 22b are designed and are opposite each other. The form surfaces 38a . 38b serve to shape the between the two clamping units 21 . 22 located wire area 1a at the shift. Here are the molding surfaces 38a . 38b diagonally to the plane E1 . E2 aligned, in which the wire 1 is fixed to perform the bending operation, that is oblique to the plane of the clamping surfaces of the clamping units 21 . 22 ,

By this arrangement, in the displacement of the between the two clamping units 21 . 22 located wire area 1a against the mold surfaces 38a . 38b pressed (see 4b) , When moving forms the molding surface 38a with the opposite mold surface 38b a terminal level E3 that slope to the plane E1 . E2 is aligned, in which the wire 1 is fixed for bending.

By the movable gripper and the second clamping unit 22 on the lead 25 can the jump in the wire 1 be carried out both upwards and downwards, that is, in two opposite directions. In addition, by small closing strokes of the parallel gripper or clamping units 21 . 22 and by the dynamics of the ball screw 31 With the servo drive the jump can be made in a very short cycle time.

Based on 5a and 5b a first embodiment of the method according to the invention for bending wire for the production of machine elements of electrical machines will be described. This is the wire 1 Centric in the bending device 100 introduced (transport system). The wire 1 is in the two adjacent clamping units 21 . 22 that in the direction P are aligned parallel to each other, fixed. To do this, close the two clamping units 21 . 22 and pinch the wire 1 (please refer 5a) ,

Now, the mutual or relative displacement of the clamping units takes place 21 . 22 so the wire 1 in the wire area 1a that is between the two clamping units 21 . 22 lies, is deformed (see 5b) , The shift takes place in the direction V , which diagonally to the direction P the parallel aligned clamping units 21 . 22 runs (see 1 ).

When closing the two clamping units, the gripping force is chosen so large that the wire 1 not in the gripping jaws during the bending process 21a . 21b . 22a . 22b begins to wander.

When bending is the between the two clamping units 21 . 22 located wire area 1a through the molding surfaces 38a . 38b shaped. This is the wire area 1a into the plane E3 shaped, sloping to the plane E1 . E2 is aligned.

Depending on the demands made on the jump to be made in the wire 1 the angle of the guide is changed or adjusted, so as to make the jump steeper or flatter or bend (see 3 ).

Another preferred embodiment of the invention will also be described with reference to FIGS 1 but no relative displacement V the clamping units 21 . 22 is required. The first clamping unit 21 and the second clamping unit 22 are next to each other arranged to open the wire 1 so that it passes through the two clamping units 21 . 22 extends. The clamping units 21 . 22 are offset or arranged offset from one another, so that the wire after its inclusion in the mutually offset clamping units 21 . 22 only by closing the two clamping units 21 . 22 in the wire area located between the clamping units 1a is deformed.

In this simplified design eliminates a displaceable mounting of the second clamping element 22 , as well as a drive unit for moving the clamping unit 22 , The clamping units 21 and 22 are designed so that, despite their staggered arrangement of the wire 1 can be inserted. By closing the two clamping units 21 . 22 becomes the wire 1 shaped so that the through the arrangement of the clamping units 21 . 22 default offset in the wire 1 formed.

The remaining elements of the device 100 according to this embodiment have already been described above with reference to 1 which will be referred to at this point.

Hereinafter, another example of a method according to the invention will be described. To perform the bending process for making a jump bend, the wire becomes 1 inserted into the two adjacent, open clamping units, so that it passes through both clamping units 21 . 22 extends. In this case, the two clamping units are arranged such that in their closed state their terminal levels E1 . E2 are shifted against each other. By closing the clamping units 21 . 22 the deformation of the wire occurs 1 in one between the two clamping units 21 . 22 located wire area 1a ,

The details of the clamping and deforming operation in the different embodiments of the invention have already been described above, to which reference is made at this point. The 6a shows a wire 1 or Hairpin schematically as a top view, which has been bent with the device according to the invention and the method according to the invention. The two legs of the hairpin extend perpendicular to the plane of the drawing at both ends 1b . 1c of the wire 1 ,

The 6b shows a pairing of two hairpins according to the present invention each with a jump in the central wire area 1a are provided.

LIST OF REFERENCE NUMBERS

1

wire

1a

wire range

1b, 1c

Ends of the wire

21

first clamping unit or gripper

22

second clamping unit or gripper

21a, 21b

jaws

22a, 22b

jaws

25

guide

30

drive unit

31

Ball Screw

32

servo drive

41

slots

100

Device for bending

A

first position or starting position

B

second position or bending position

E1

Terminal level of the first clamping unit

E2

Terminal level of the second clamping unit

E3

Level of connection between E1 and E2

P

Direction of the parallel aligned clamping units

V

Direction of displacement of one clamping unit against the other

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2684283 B1 [0004]
• EP 1554794 B1 [0004]
• EP 1041696 B1 [0004]

Claims (21)

Device for bending wire for the production of machine elements of electrical machines, comprising a first clamping unit (21) and a second clamping unit (22) arranged side by side and aligned in a direction P parallel to each other for fixing a wire (1), a drive unit (30) which displaces the second clamping unit (22) relative to the first clamping unit (21) in order to deform the wire (1) in a wire area (1a) located between the two clamping units (21, 22), wherein the displacement in a direction V obliquely to the direction P of the parallel alignment of the clamping units (21, 22) takes place. Device after Claim 1 , characterized in that the two clamping units (21, 22) are arranged so as to reduce their mutual distance while being displaced to deform the wire (1) while maintaining their parallel orientation. Device after Claim 1 or 2 , characterized in that at least one of the two clamping units (21, 22) has a forming surface (38a, 38b) for shaping the wire region (1a) located between the two clamping units (21, 22). Device after Claim 3 , characterized in that 4.1. the forming surface (38a, 38b) is oriented obliquely to a plane (E1, E2) in which the wire (1) is fixable for bending, and / or 4.2. the shaping surface (38a, 38b) is arranged such that during the displacement of the wire region (1a) located between the two clamping units (21, 22) is pressed against the forming surface (38a, 38b), and / or 4.3. the mold surface (38a) upon compression of the clamping units (21, 22) with an opposite mold surface (38b) forms a clamping plane (E3) oriented obliquely to the plane (E1, E2) in which the wire (1) flexes can be fixed. Device according to one of the preceding claims, characterized in that the first clamping unit (21) is fixedly mounted and the second clamping unit (22) on a guide (25) is mounted linearly movable. Device according to one of the preceding claims, characterized in that 6.1. the angle between the direction V of displacement and the direction P of parallel alignment of the clamping units (21, 22) is adjustable, and / or 6.2. the displacement comprises a component of motion parallel and a component of motion perpendicular to a plane (E1) in which the wire (1) can be fixed in the clamping units (21, 22), and / or 6.3. the clamping units (21, 22) are mutually displaceable in two opposite directions to allow deformation of the wire (1) in two directions, and / or 6.4. the clamping units (21, 22) are configured such that in a first position (A) they fix the wire (1) in a plane (E1), and in a second position (B) are offset relative to one another, so that the Wire (1) over two different levels (E1, E2) extends, and / or 6.5. the clamping units (21, 22) are designed as grippers, each comprising two opposing gripping jaws (21a, 21b, 22a, 22b) for clamping the wire (1), and / or 6.6. the clamping units (21, 22) each comprise two opposite, mutually parallel clamping surfaces for clamping the wire (1). Device according to one of the preceding claims, characterized in that 7.1. the drive unit (30) comprises a ball screw drive (31), and / or 7.2. the drive unit (30) comprises a servo drive (32), and / or 7.3. a bending axis for bending the wire (1) to a predetermined value of the shortening of the wire (1) during bending is adjustable, and / or 7.4. one or more arcuate slots (41) are provided for adjusting the bending axis. Device for bending wire for the production of machine elements of electrical machines, in particular according to one of the preceding claims a first clamp unit (21) and a second clamp unit (22) arranged side by side to receive a wire (1) in the opened state so as to extend through both clamp units (21, 22); wherein the two clamping units (21, 22) are displaced relative to one another such that the wire (1) is deformed by closing the two clamping units (21, 22) in a wire region (1a) located between the two clamping units (21, 22). Device after Claim 8 , characterized in that at least one of the two clamping units (21, 22) has a forming surface (38a, 38b) for shaping the wire region (1a) located between the two clamping units (21, 22) during closing of the clamping units (21, 22). Device after Claim 9 , characterized in that 10.1. the forming surface (38a, 38b) is oriented obliquely to a plane (E1, E2) serving to receive the wire in the clamping units (21, 22), and / or 10.2. the forming surface (38a, 38b) is arranged such that upon closing of the clamping units (21, 22) the wire region (1a) located between the two clamping units (21, 22) is pressed against the forming surface (38a, 38b), and / or 10.3. the mold surface (38a) upon closure of the clamping units (21, 22) with an opposite mold surface (38b) forms a clamping plane (E3) oriented obliquely to the plane (E1, E2) in which the wire (1) flexes can be fixed. Device according to one of Claims 8 to 10 , characterized in that 11.1. the clamping units (21, 22) are designed such that in the closed state their terminal planes (E1, E2) are offset relative to one another, so that the wire (1) extends over two different planes (E1, E2), and / or 11.2 , the clamping units (21, 22) are designed as grippers, each comprising two opposing gripping jaws (21a, 21b, 22a, 22b) for clamping the wire (1), and / or 11.3. the clamping units (21, 22) each comprise two opposing, mutually parallel clamping surfaces for clamping the wire (1), and / or 11.4. the clamping units (21, 22) are aligned in a direction P parallel to each other. Method for bending wire for the production of machine elements of electrical machines, comprising the steps: - Fixing the wire (1) in two adjacent clamping units (21, 22) which are aligned in a direction P parallel to each other; - Mutual displacement of the clamping units (21, 22) to deform the wire (1) in a between the two clamping units (21, 22) located wire region (1 a) - The displacement takes place in a direction V, which is oblique to the direction P of the parallel aligned clamping units (21, 22). Method according to Claim 12 , characterized in that the mutual distance of the clamping units (21, 22) is reduced while they are displaced relative to each other while maintaining their parallel alignment. Method according to Claim 12 or 13 , characterized in that the wire region (1a) located between the two clamping units (21, 22) is formed during bending by at least one molding surface (38a, 38b). Method according to one of Claims 12 to 14 , characterized in that 15.1. the wire portion (1a) is formed in a plane (E3) oriented obliquely to a plane (E1, E2) in which the wire (1) is fixed for bending, and / or 15.2. the wire region (1a) is pressed against a forming surface (38a, 38b) during the displacement, and / or 15.3. the wire region (1a) is pressed in the displacement of two opposite sides in a plane (E3), which is oriented obliquely to the plane (E1, E2), in which the wire (1) is fixed for bending. Method according to one of Claims 12 to 15 , characterized in that the second clamping unit (22) is moved linearly while the first clamping unit (21) is fixed. Method according to one of Claims 12 to 16 , characterized in that 17.1. the angle between the direction V of displacement and the direction P is set to a predefined value, and / or 17.2. the displacement takes place with a component of motion parallel and a component of motion perpendicular to a plane (E1, E2) in which the wire (1) is fixed, and / or 17.3. the displacement is selected from one of two opposite directions, and / or 17.4. the wire (1) after the displacement over two different, parallel planes (E1, E2) extends. Method for bending wire for the production of machine elements of electrical machines, in particular according to one of Claims 12 to 17 comprising the steps of: - placing a wire (1) in two adjacent, open clamping units (21, 22) so that it extends through both clamping units (21, 22), - wherein the two clamping units (21, 22) arranged in such a way are that in their closed state their clamping planes (E1, E2) are shifted from one another, - deformation of the wire (1) in a wire region (1a) located between the two clamping units (21, 22) by closing the clamping units (21, 22) , Method according to Claim 18 , characterized in that 19.1 of the wire region (1a) located between the two clamping units (21, 22) is formed during deformation by at least one forming surface (38a, 38b), and / or 19.1. the wire region (1a) is formed in a plane (E3) which is oriented obliquely to a plane (E1, E2) into which the wire (1) is inserted for bending, and / or 19.2. the wire region (1a) is pressed against a forming surface (38a, 38b) during closing of the clamping units (21, 22), and / or 19.3. the wire region (1a) is pressed when closing the clamping units (21, 22) in a plane (E3), which is aligned obliquely to the plane (E1, E2), in which the wire (1) is fixed for bending, and / or 19.4. the wire (1) after closing the clamping units (21, 22) over two different, mutually parallel planes (E1, E2) extends. Method according to one of Claims 12 to 19 , characterized in that it is provided with a device according to one of Claims 1 to 8th or 9 to 12 is carried out. Program for controlling a device for bending wire, the program steps for carrying out the method according to one of Claims 12 to 20 includes.

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