DE102020100410B4 - Process and device for connecting plastic profile parts for window or door frames - Google Patents

Abstract

Process for connecting plastic profile parts (1, 2) for window or door frames, in which at least one profile part (1, 2) and a heating surface (3) of a heating element (4) are brought into contact with one another in order to connect the at least one profile part (1, 2) to melt in its joint area before joining with the other profile part (2, 1), with a bead (5) forming during the melting and/or during the joining of the profile parts (1, 2) at their joint area (8). two partial tools (6, 7) moving towards one another and holding the bead (5) between them is removed, characterized in that the bead (5) is gripped by the two partial tools (6, 7) and is directed away from the frame corner by a one Subtracting movement of the sub-tools (6, 7) is removed.

Description

The invention relates to a method for connecting plastic profile parts for window or door frames, wherein at least one profile part and a heating surface of a heating element are brought into contact with one another in order to melt the at least one profile part in its joint area before it is joined to the other profile part. The invention also relates to a device for connecting plastic profile parts, for carrying out the method.

Methods and devices of the type mentioned are used in particular for welding PVC profile rods to window frames or door frames. For this purpose, the profile bars are cut to the required length before welding and, if necessary, mitered in order to then connect the profile parts at the cut surfaces by welding.

The actual welding of the profile parts is carried out by melting and then joining the connecting surfaces on the ends of the profile bar. For this purpose, the profile parts to be welded are first placed in the device and positioned using stops and guides. The connecting surfaces for the so-called adjustment and heating process are then pressed in a joining device against the heating surface of the heating element, with material being melted on the connecting surface, i.e. in the welding area. After heating, rearranging and joining takes place, with the heating element being removed between the profile parts. The profile parts are then moved towards one another with the melted connecting surfaces and pressed against one another, with the still hot, thermoplastic material of the two profile bar ends connecting in such a way that a stable welded connection is created.

In order to prevent a weld bead standing up on the later visible surfaces of the profile parts, after the WO 2013/132406 A1 the connecting surfaces of the profile parts are profiled before welding. The end edges of the profile parts are machined mechanically using milling cutters, so that the connecting surfaces lying opposite one another are designed in steps. When connecting the profile parts, a chamber opens to the outside, into which the weld bead that occurs when the profile parts are upset or pressed against one another is displaced. In order to prevent a welding bead that is directed outwards beyond the chamber, a pressing device is used, which holds the material of the welding bead in the chamber and smoothes it out.

However, the profiling of the profile pieces on their subsequent joining surfaces weakens the connection, since the material displaced into the groove does not lead to a homogeneous, loadable connection between the profile bars. Since the grooves are formed on the outer areas of the profile pieces, in which large forces, particularly torsional forces, act under load, the joint connection between the profile pieces can break, which means that the known methods do not always appear to be useful.

From the DE 22 10 814 A discloses a device for removing the welding bead occurring at the butt joint between profiled rods made of weldable plastic that are welded to one another, with a pair of knives that can be moved together and are preferably arranged on all sides around the profiled rods and meet in the plane of the root of the welding bead. The knives hit the root of the welding bead, but it is not reliably ensured that the welding bead is also completely removed from this area, since the knives open again when moving away after meeting. The welding bead cut off at the root is not picked up between the knives and not removed from the welding point, but remains on the profile or the joint surface. Furthermore, there is no synchronization of the knives in this prior art, so one of the knives can first reach the root of the weld bead and move it a little, so that safe removal of the weld bead is made more difficult and disadvantages with regard to the visual appearance of the joint can arise.

Proceeding from this, the object of the invention is to provide an improved method and an improved device for connecting plastic profile parts, which is characterized by a high strength of the connection and a visually appealing appearance.

The object is achieved by a method having the features of claim 1 and by a device having the features of claim 15. Advantageous configurations of the invention are the subject matter of dependent claims.

In the method according to the invention, it is provided that a bulge that forms on the frame corner during the melting and/or during the assembly of the profile parts is removed by two sub-works moving toward one another and receiving the bulge between them witness is removed. At the end of the melting process, at the latest at the beginning of the upsetting process, the two partial tools are guided at the overlap of the window or door profile in such a way that the partial tools at the frame corner at least almost touch each other like pliers. The two part tools are then moved away from the profile or from the frame corner in the miter direction of the profile parts at high speed in the closed state, as a result of which the weld bead is removed. In the event that the welding bead is only cut, the welding bead or beads are literally torn out of the corner of the frame when the sub-tools move away. Almost no weld bead remains on the frame corner. In the case of inner corner processing, it has even been shown that any remaining weld bead residues are drawn into the inner corner area during the remaining upsetting process by the upsetting movement of the profile parts. The overall result is a visually appealing frame corner connection.

In the method according to the invention, a bulge is deliberately allowed to form, so that the welded connection is also retained in the area of the edges of the profile pieces and, in contrast to the prior art, in which the joining surfaces are also profiled in the edge area, there is no weakening of the welded connection in this area comes. This achieves increased strength of the corner joint with a visually appealing appearance without the need for rework.

A particular advantage of the method according to the invention is that it can be used both for processing inside corners and for processing outside corners of window and door frames.

Weld beads on the profile pieces often already occur when they melt during contact with the heating mirror. In the method according to the invention, these separate welding beads on the profile parts are supported against one another during cutting by means of the sub-tools and as a result cannot be deformed inwards towards the joining surface. When separating or cutting, they then form a counter bearing for the partial tool acting on the other weld bead, so that a clean separation of the separate weld beads and thus a visually appealing result can be achieved on the outside or inside corner of a frame.

According to a first particular embodiment of the invention, it is provided that the bead is at least partially cut or severed by the two partial tools moving toward one another. According to the invention, the bead does not have to be completely severed by the partial tools moving towards one another. It is already sufficient to cut the bead. By moving the partial tools back away from the profile at high speed, the bead is then torn out of the inside or outside corner of the profile bars.

According to one idea of the invention, it is provided that the severing or cutting of the bead by the sub-tools takes place at least partially while the profile parts are being upset against one another. In this phase, the plastic has a high degree of plasticization and can be easily cut or severed.

According to the invention, it is also possible for the bead to be removed during the upsetting process of the profiles against one another, but preferably before the end of the upsetting process. The material to be removed then has sufficient overall plasticity to be able to remove it completely and create a clean corner connection.

According to the invention, the bead is gripped by the two tool parts and removed at least by a pulling movement of the tool parts directed away from the frame corner. By moving the partial tools away from the profile, any adhesions of plastic material on the corner joint are also torn off, so that the quality of the corner joint can be further improved.

In order to achieve the shortest possible cycle time in the production of the corner connection, it is provided according to a further idea of the invention that after or when contacting the joint surfaces of the melted plastic profile parts, the partial tools are moved from an initial position to a working position in the direction of the frame corner, preferably synchronously . The synchronous movement of the sub-tools contributes to a high level of process reliability when cutting off the weld bead, since no sub-tool can lead or lag behind. In the working position, the partial tools are in the closed position, ie they form a pair of tongs to cut through the weld beads, or at least to cut them.

According to a further idea of the invention, the partial tools are arranged on assigned supports for the profile parts, which can be moved towards one another to join the profile parts, so that the partial tools can be moved together with the supports from a basic position to the starting position. This measure according to the invention can be based on additional drives for converting the partial tools the basic position to the starting position can be dispensed with. In the basic position, the partial tools with drives are pulled back so that there is exactly enough free space for inserting the heating mirror between the profile parts during the melting process.

According to another proposal of the invention, it is provided that the partial tools are advanced from their initial position in the direction of the associated profile part and, upon contact with the profile part, by means of an elastic force, which preferably acts perpendicularly to the longitudinal axis of the respective profile part, in the contact position on the profile part in the direction the frame corner. Prior to processing, there is no direct contact between the processing tools and the profile. Due to the elastic force on the dividing tools, there is no damage to the profile when moving from the starting position to the working position. Above all, this measure according to the invention ensures that the partial tools get behind the weld bead at the frame corner, ie at the root of the weld bead, so that the weld bead is cut cleanly or separated at its base on the profile part.

The partial tools can be arranged so that they can rotate in the support plane of the profile parts and/or can be tilted in a plane perpendicular thereto, so that shape, position and/or angle tolerances of the profile parts can be compensated for. The ability to rotate and/or tilt can take place against an elastic restoring force, so that the partial tools are always returned to their basic position.

According to the invention, the partial tools can each be held in the closed position by means of a pushing force, in particular when withdrawing away from the profile, so that a visually appealing corner connection is created. This also makes it possible to further improve the process reliability.

According to the invention, it is provided that the thrust force on the partial tools is canceled after the end of the retraction movement for removing the bead and the partial tools are returned to their starting position after the separated bead has been released, provided that the bead has not already been severed and fallen off so that they are prepared for the next work cycle.

In terms of the device, the object is achieved in that at least two sub-tools are provided for processing the bead that occurs when the profile parts are melted and/or joined together in their joining area, which act on opposite sides of the bead and are moved by means of actuators from an initial position to a working position to the Melting or cutting through the bead can be moved.

According to the invention, at least two actuators in each case act on the part tools, with different directions of action X and Y, the resultant R of which moves the part tools from the initial position in the direction of the frame corner, contacting the respective profile part. In the starting position, the partial tools are not in contact with the profile part to be machined. As a result, the profile cannot be damaged unintentionally when the partial tools begin to move.

According to the invention, one of the two actuators acting on the respective tool part is designed as a push device, preferably as a pull-push device, and the second actuator as an elastic element, e.g. spring element, which makes the design of the device simple and inexpensive due to proven components for the actuators .

The dividing tools are moved from the initial position to the corner of the frame. The associated spring element acts i. w. perpendicular to the longitudinal axis of the respective profile on the respective sub-tool, so that the resulting force displaces the sub-tool along the overlap of the profile part to the inside or outside corner of the frame. The sub-tools can be moved behind the welding bead and cut it off directly on the profile. Overall, this results in at least an almost complete separation of the welding bead, which corresponds to the aesthetic requirements for window and door frames.

It has proven to be particularly favorable in terms of design if, with the elastic spring element acting essentially perpendicularly to the longitudinal axis of the profile on the respective tool part, the direction of action of the associated push/pull devices has an angle of 90°>α<180° in relation to the direction of action of the associated elastic element , preferably from α = 112.5°. With this alignment of the pull/push device, they can be placed practically next to each other in a space-saving manner below the supports for the profile parts and/or arranged outside the effective range of the welding mirror.

The partial tools are preferably arranged on assigned supports for the profile parts, which can be moved towards one another to bring the profile parts together, the partial tools together with the supports being moved from a possibly retracted basic position to the starting position of the partial tools by means of drive devices for Frame corner out, in particular servo motors, are movable. In this way, the drives for the supports of the profile pieces can also be used for the movement of the sub-tools from the retracted basic position into the working position.

It is structurally particularly simple if one of the two actuators acting on the respective sub-tool is arranged at an angle, preferably by means of a holder, on the actuating element of the respective other actuator.

The holder of each of the partial tools is guided around a guide for the profile parts, preferably arranged on the supports, so that a precise and reproducible infeed of the partial tools is possible.

The tool parts can be detachably arranged on tool carriers so that the tool parts can be easily exchanged or sharpened.

According to the invention, a pusher element is provided that holds the respective partial tool in the closed position, as a result of which a high level of process reliability is ensured when removing the bead. Only when the bead or beads have been removed from the frame corner does the thrust or locking cylinder open in order to return the sub-tools to their starting position. The respective thrust or locking cylinder is preferably also guided in a support for the corresponding profile part, preferably in turn on the support.

The retraction movement of the partial tools away from the corner of the frame is taken over by the pull/push devices when they extend again, i.e. return to their starting position. Due to the fact that the direction of movement of the pull/push elements or the pull/push devices takes place at an angle of α=112.5°, the partial tools would open immediately during this retraction movement. So that this does not happen, the extended thrust cylinders or thrust elements keep the partial molds closed by compensating for the path of the opening movement due to the elastic restoring force of the thrust cylinders or thrust elements. When the thrust cylinders or thrust elements then open again, the severed weld bead is released.

To limit the movement of the tool parts relative to each other and to avoid damage to the tool parts during the infeed movement, stops which interact with one another and are preferably adjustable are arranged on the tool parts or tool carriers.

According to the invention, synchronization means are provided for a synchronous movement of the tool parts into the working position, which are disengaged from one another in the starting position of the tool parts and engage with one another when the tool carriers or tool parts move in the direction of their working position. This mechanical synchronization represents a simple and inexpensive means with enormous process reliability.

According to the invention, the synchronizing means can be designed as rods arranged on the tool parts or tool carriers, which come into contact with the respective other tool carrier when the tool parts are displaced from the initial position into the working position.

In order to achieve a secure interlocking of the synchronizing means, the invention provides that the systems for the bars of the synchronizing means are preceded by ramps or cams on the tool carriers, along which the bars can slide from the starting position to the working position and back.

In order to enable tolerance compensation, the partial tools can be mounted in the plane of the support for the profile parts, possibly against a restoring force, such that they can be rotated and/or tilted in a plane perpendicular to the receiving plane.

Further goals, advantages, features and application possibilities of the present invention result from the following description of an exemplary embodiment with reference to the drawing.

• 1 eine dreidimensionale Teilansicht einer möglichen Ausführungsform einer erfindungsgemäßen Vorrichtung zum Verschweißen von Kunststoffprofilteilen zu Fenster-Türrahmen,
• 2 eine Ansicht eines Details der Vorrichtung nach 1 mit eingelegten Profilteilen vor Einfahren des Heizspiegels,
• 3 die Ansicht ähnlich 2, jedoch mit in Arbeitsstellung befindlichen Teilwerkzeugen,
• 4 eine weitere Detailansicht der Vorrichtung gemäß 1,
• 5a bis 5c unterschiedliche Stellungen der Teilwerkzeuge und deren Synchronisiermittel in perspektivischer Darstellung und
• 6 bis 13 die zeitliche Abfolge der Arbeitspositionen der Vorrichtung mit Anschmelzen der Profilteile bis zum fertiggestellten Rahmeneck.

Show it:

• 1 a three-dimensional partial view of a possible embodiment of a device according to the invention for welding plastic profile parts to window-door frames,
• 2 a view of a detail of the device 1 with inserted profile parts before retracting the heating mirror,
• 3 the view similar 2 , but with partial tools in working position,
• 4 a further detailed view of the device according to FIG 1 ,
• 5a until 5c different positions of the sub-tools and their synchronizing means in a perspective view and
• 6 until 13 the chronological sequence of the working positions of the device Melting of the profile parts up to the finished frame corner.

1 shows a partial section of a device for connecting two plastic profiles to produce a frame corner of a window or door frame. The plastic profile parts are, for example 2 can be seen and attracted there by reference numerals 1 and 2. In the following, the plastic profile parts are referred to as profile parts 1, 2, which are made of PVC, for example.

The device has supports 34, 35 for the profile parts 1, 2 of a welding table (not shown) and stops 40, 41 against which the profile parts 1, 2 to be connected are placed. Additionally are off 1 Recordings 42, 43 can be seen for clamping elements, not shown, by means of which the profile parts 1, 2 are clamped onto the supports 34, 35 of the welding table.

Furthermore are off 1 Partial tools 6, 7 with cutting edges 15, 16 can be seen, by means of which the beads 5 resulting from the melting and/or welding of the profile pieces 1, 2 are removed. These beads are, for example, from the 6 until 11 to recognize.

The partial tools 6, 7, which are even clearer 2 can be seen are held on tool carriers 19, 20 in an interchangeable manner, so that an exchange or sharpening of the sub-tools 6, 7 or knives is possible.

How out 1 can be seen, the actuators or drive units for the actuation of the partial tools 6, 7 are below the supports 34, 35 and are operatively connected to them. As a result, when the supports 34, 35 are moved in the direction M, the actuators for the tool parts 6, 7 can be moved into a basic position by means of their feed drives 32, 33, without separate drives being required for this.

As far as the attachment of the actuators for the infeed movement of the tool parts 6, 7 on the respective profile part 1, 2 is concerned, 12 1, which shows the device from below looking at the supports 34,35. In the exemplary embodiment chosen here, the actuators for the partial tools 6, 7 consist of pull/push devices 13, 14, which are mounted on the underside of the supports 34, 35. The actuating element 36, 37 of the respective push/pull devices 13, 14 acts on an angular holder 38, 39, on which, as in particular 4 and, for example, FIG. 5b, a spring-elastic element, in particular a compression spring 22, 23, is arranged in each case, which acts perpendicular to the respective profile longitudinal axis.

According to 12 and 13 the angular holders 38, 39 are guided on guides 11, 12, which are arranged on the underside of the supports 34, 35 in the exemplary embodiment selected here.

The different effective directions X, Y of the push/pull device 13, 14 and the spring-elastic elements 22, 23 can be indicated by the double arrows in 12 remove. The directions of action X and Y of the two actuators acting on a tool part 6 or 7, i.e. the push/pull device 13, 14 and the spring element 22, 23 acting perpendicularly to the longitudinal axis of the respective profile part 1, 2, are selected in such a way that the resultant R, which off 8th and 9 it can be seen that the partial tools 6, 7 resting on the respective profile part 1, 2, in particular its rollover 10, moves in the direction of the frame corner 8, 9 in order to move with the cutting edges 16, 17 of the partial tools 6, 7 behind the or the beads 5 or the root of the beads 5 on the respective profile part 6, 7 and separate them, but at least cut them.

In the exemplary embodiment selected here, the angle α between the respective push/pull device 13, 14 and the effective direction Y of the respectively associated elastic element 22, 23 is approximately α=112.5°. This has proven to be particularly favorable in order to prevent the surface of the partial profile 1, 2 from being damaged when the partial tools 6, 7 are fed to the overlap 10 of the respective profile part 1, 2. Instead, the partial tools 6, 7 slide along the profile part 1, 2 or along the rollover 10 to the frame corner 8, 9 and grip behind the root of the bead or beads 5 in order to remove them by pulling back the closed tool parts 6, 7 to detach.

The two partial tools 6 , 7 forming a pair of pliers are held in the closed position by means of thrust elements, in particular thrust cylinders 24 , 25 , and are pulled away from the frame corner 8 , 9 so that the welding beads 5 are safely removed from the frame corner 8 , 9 . The thrust cylinders 24, 25 are in particular the 4 and 5 refer to. Out 1 the heating mirror or the heating element 4 with heating surfaces 3 formed on both sides can also be seen.

In order to achieve synchronization of the tool parts 6, 7, synchronizing means which interact with one another are provided on the tool parts 6, 7 or tool carriers 19, 20. 2 and 5 can be seen, have rods 26, 27 which, when the partial tools 6, 7 are displaced from the starting position, such as 5a , are out of engagement with each other. Only with the gradual delivery of the Sub-tools 6, 7, the rods 26, 27 come into contact with systems 44, 45, such as these, for example 2 can be found. In order to enable the rods 26, 27 to mesh as smoothly as possible, the systems 44, 45 are preceded by starting curves 28, 29, on which the rods 26, 27 slide from the starting position into the working position and slide back again when the pliers are opened.

The individual movements of the synchronizing with the interacting rods 26, 27 are the 5a until 5c to see where 5a the initial position of the partial tools 6, 7 and 5c shows the working position.

Below are the individual steps of the device based on the 6 until 13 explained.

So is in 6 the heating mirror or the heating element 4 is retracted into the work area between the two profile pieces 1, 2. The conditions 34, 35 are delivered to melt the profile parts 1, 2. The partial tools 6, 7, which are shown here for processing the profile parts 1, 2, are in their basic position.

When the profile parts 1, 2 melt, weld beads 5 form on the inside corners 8 of the profile pieces 1, 2, as shown in 6 is shown.

Then the table axes or the supports 34, 35 are opened by means of the servomotors 32, 33 and the welding mirror 4 is moved out, with the partial tools 6, 7 still being in their basic position.

According to 7 the table axes or supports 34, 35 are then moved towards one another in the direction L, M for joining the profile parts 1, 2, with the profile parts 1, 2 contacting one another with their melted-on profile surfaces. The profile support table or the two editions 34, 35 are.

Then the partial tools 6, 7 move over the in 11 and 12 to be seen guides 11, 12, which are arranged at an angle of α ≈ 22.5 ° to the joint surface and are located below the profile support 34, 35, by means of the pull / push device 13, 14 and the spring elements 22, 23 before, to they rest against the respective profile part 1, 2. This step is in 8th to see.

The push/pull devices 13, 14 then move the associated partial tools 6, 7 further until stops 30, 31 abut one another, as is shown in 9 is shown. During this travel, the tool parts 6, 7 move along the profile edge or along the rollover 10 of the profile parts 1, 2 in the direction of the inner frame corner 8, with the tool parts 6, 7 at least almost meeting. The weld bead 5 is squeezed and possibly even severed. The pushing element 24, 25 is then used to hold the partial tools 6, 7 with their cutting edges 15, 16 in the closed position in the manner of pliers.

How out 10 As can be seen, the tool parts 5, 6 still in the closed position are then moved away from the profile edge by means of the push/pull devices 13, 14, for example by 10 mm. The retraction movement of the sub-tools 6, 7 away from the corner of the frame is taken over by pull/push elements 13, 14 when they extend again, ie move back into their starting position. Due to the fact that the direction of movement of the pull/push elements 13, 14 takes place at an angle α=112°, the part tools 6, 7 would open immediately during the retraction movement. So that this does not happen, the extended thrust cylinders 24, 25 keep the partial tools closed by compensating for the path due to the elastic restoring forces of the thrust cylinders 24, 25.

Then the pushing elements 24, 25 open, the tongs open, the welding bead 5 is removed and the partial tools 6, 7 can be returned to their starting position ( 11 ) and, if necessary, by means of the servomotors 32, 34 into the retracted basic position.

Reference List

1

plastic profile part

2

plastic profile part

3

heating surface

4

heating element

5

bead

6

part tool

7

part tool

8th

inside frame corner

9

outside frame corner

10

rollover

11

guide

12

guide

13

pulling/pushing device

14

pulling/pushing device

15

cutting edge

16

cutting edge

18

miter

19

tool carrier

20

tool carrier

21

bisector

22

compression spring

23

compression spring

24

sliding element

25

sliding element

26

Rod

27

Rod

28

Starting slope/starting curve

29

Starting slope/starting curve

30

attack

31

attack

32

Feed drive/servo motor

33

Feed drive/servo motor

34

edition

35

edition

36

actuator

37

actuator

38

holder

39

holder

40

attack

41

attack

42

admission

43

admission

44

factory

45

factory

X

effective direction

Y

effective direction

R

resulting

L

effective direction

M

effective direction

a

angle

Claims (30)

Process for connecting plastic profile parts (1, 2) for window or door frames, in which at least one profile part (1, 2) and a heating surface (3) of a heating element (4) are brought into contact with one another in order to connect the at least one profile part (1, 2) to melt in its joining area before joining with the other profile part (2, 1), with a bead (5) forming during the melting and/or during the joining of the profile parts (1, 2) at their joining area (8). two partial tools (6, 7) moving towards one another and holding the bead (5) between them is removed, characterized in that the bead (5) is gripped by the two partial tools (6, 7) and is gripped by a one pointing away from the frame corner Subtracting movement of the sub-tools (6, 7) is removed. procedure after claim 1 , characterized in that the bead (5) is at least partially cut or severed by the two partial tools (6, 7) moving toward one another. procedure after claim 1 or 2 , characterized in that the severing or cutting of the bead (5) by the sub-tools (6, 7) takes place at least partially during an upsetting of the profile parts (1, 2) against one another. Method according to one of the preceding claims, characterized in that the bead (5) is removed during the process of upsetting the profiles (1, 2) against one another. procedure after claim 4 , characterized in that the bead (5) is removed before the end of the upsetting process. Method according to one of the preceding claims, characterized in that after or when the joining surfaces of the melted plastic profile parts (1, 2) come into contact, the sub-tools (6, 7) are moved from an initial position into a working position in the direction of the frame corner (8). procedure after claim 6 , characterized in that the partial tools (6, 7) are moved synchronously from the starting position to the working position in the direction of the frame corner (8). Method according to one of the preceding claims, characterized in that the partial tools (6, 7) are arranged on associated supports (34, 35) for the profile parts (1, 2) which can be moved towards one another to join the profile parts (1, 2). , wherein the partial tools (6, 7) can be moved together with the supports (34, 35) from a basic position to the starting position. Method according to one of the preceding claims, characterized in that the partial tools (6, 7) are advanced from their initial position in the direction of the associated profile part (1, 2) and, upon contact with the respective profile part (1, 2) by means of an elastic force, come into contact tion on the respective profile part (1, 2) in the direction of the frame corner. procedure after claim 9 , characterized in that the elastic force acts perpendicularly to the profile longitudinal axis of the respective profile part (1, 2). procedure after claim 9 or 10 , characterized in that the partial tools (6, 7) are each held in the closed position by means of a thrust force, in which the partial tools (6, 7) are pressed against one another for cutting or severing the bead (5). procedure after claim 11 , characterized in that the thrust acts elastically. Method according to one of the preceding claims, characterized in that the partial tools (6, 7) can be rotated in the receptacle of the profile parts (1, 2) and/or tilted in a plane perpendicular to the plane of the receptacle. procedure after claim 11 until 13 , characterized in that the pushing force on the sub-tools (6, 7) is canceled after completion of the retraction movement for removing the bead (5) and the sub-tools (6, 7) are returned to the starting position after the separated bead (5) has been released. Device for connecting plastic profile parts (1, 2) for carrying out the method according to one of the preceding claims, wherein at least one profile part (1, 2) and a heating surface (3) of a heating element (4) can be brought into contact with one another in order to heat the at least one The profile part (1, 2) is to be melted in its joining area before it is joined to another profile part (2, 1), with at least two partial tools (6, 7) for processing the profile part (1, 2) that is melted and/or joined together bead (5) produced at the joint area thereof, which act on opposite sides of the bead (5) and can be moved from a starting position to a working position by means of actuators, characterized in that at least two actuators each are mounted on the partial tools (6, 7). (13, 12; 22, 23) act with different effective directions X, Y, the resultant R of which causes the partial tools (6, 7) to rest on the respective profile part (1, 2nd ) moves in the direction of the frame corner (8, 9). device after claim 15 , characterized in that one of the two actuators acting on one of the partial tools (6, 7) is designed as a push/pull device (13, 14), and the second actuator is designed as a spring-elastic element (22, 23). Device according to one of Claims 15 or 16 , characterized in that one of the two actuators (13, 14) assigned to a partial tool (6, 7) acts with an actuating element (36, 37) at an angle on the respective other actuator (22, 23). device after Claim 17 , characterized in that one of the two actuators (13, 14) assigned to a partial tool (6, 7) acts on the respective other actuator (22, 23) by means of an angled holder (38, 39). device after Claim 16 until 18 , characterized in that the elastic element (22, 23) is designed to act perpendicularly to the longitudinal axis of the profile on the respective tool part (5, 6), the direction of action of the associated push/pull devices (13, 13) being at an angle of 90° >α<180° in relation to the effective direction of the elastic element (22, 23). Device according to one of the preceding Claims 15 until 18 , characterized in that the partial tools (6, 7) with the associated actuators (13, 14) are arranged on supports (34, 35) for the profile parts (1, 2), the supports (34, 35) for assembling the Profile parts (1, 2) can be moved relative to one another and the tool parts (6, 7) with actuators (13, 14) together with the supports (34, 35) from a basic position into the starting position of the tool parts (6, 7) by means of drive devices for the supports (34, 35) can be moved. device after claim 20 , characterized in that the driving devices are servomotors (32, 33). Device according to one of Claims 15 until 21 , characterized in that the partial tools (6, 7) are held in the closed position by means of a push element (24, 25). device after Claim 22 , characterized in that the thrust element (24, 25) is a thrust cylinder. Device according to one of claims 17 until 23 , characterized in that the holders (38, 39) are provided on the underside of the support (34, 35). Device according to one of Claims 15 until 24 , characterized in that the movement of the partial tools (6, 7) from the starting point in the working position is limited by alternating stops (30, 31). Device according to one of Claims 15 or 25 , characterized in that mutually interacting synchronizing means are provided on the part tools (6, 7) for a synchronous movement of the part tools (6, 7) into the working position, which means are disengaged from one another in the initial position of the part tools (6, 7). device after Claim 26 , characterized in that the synchronizing means are designed as rods (26, 27) arranged on the tool parts (6, 7) which, when the tool parts (6, 7) are displaced from the starting position into the working position, come into contact with systems (40, 45) reach the respective other tool carrier (19, 20), on which the rods (26, 27) slide along from the starting position to the working position and back. device after Claim 27 , characterized in that the systems (40, 45) are preceded by ramps or cams (28, 29). Device according to one of Claims 15 until 28 , characterized in that the part tools (6, 7) are held on tool carriers (19, 20) on which the actuators (12, 13; 22, 23) act, the part tools (6, 7) in the receiving plane of the profile parts (1, 2) are mounted on the tool carrier (20, 21) such that they can be rotated and/or tilted in a plane perpendicular to the receiving plane. Device according to one of Claims 15 until 29 , characterized in that the partial tools (6, 7) are arranged in such a way that they preferably engage with a cutting edge (15, 16) on or behind the bead (5).

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