EP3031547B1 - Method and device for creating a corner connection - Google Patents

Description

The invention relates to a method and an apparatus for producing the corner joint of metal frame for windows or doors, in which two hollow profile rods are joined together via a miter cut and interconnected by a arranged in the hollow profile bars corner angle according to the preamble of claim 1 (see, eg DE-A1-21 46 570 ). The invention further relates to an apparatus for carrying out this method according to the preamble of claim 5.

State of the art

From the DE 195 32 564 A1 is a Eckverbindungspresse for producing metal frame of the type mentioned above known. First, the profile bars to be machined are placed against each other at a miter interface. In the interface then a Eckwinkelstück is inserted. Subsequently, the two profile bars are pressed with the Eckwinkelstück. For this purpose, tongues are first sheared or punched out of the profile bars by pressing tools. The press tools then retract first, before they press in a further step, the sheared tongues in the Eckwinkelstücke. The second step should serve to allow the tongues cut out a material recovery that soothes the molecules of the material. The Eckwinkelstücke have recesses into which the tongues cut out of the profiled bars are pressed, each Eckwinkelstück has at its two ends depending on a tongue.

Furthermore, from the EP 0 638 377 A1 a similar prior art known. A punching head for corner connecting machines is provided for connecting hollow profile parts with corner angles arranged therein. The punching head has a first and a second displaceably arranged punching body each with a punching knife. Before the hollow sections are pressed, a basic adjustment of the machine takes place. First, the corner bracket is inserted into a receptacle of the machine. Subsequently, a punching body is positioned and then locked in such a way that the punching knife is correctly punched into the Eckwinkelnut the corner angle. The second punch body is adjusted according to the measured distance on the hollow profile and also locked. To Removal of the corner angle from the recording, the corresponding material wall thickness of the hollow profile can be set on the recording and inserted to be pressed hollow sections with the corner angles in the recording.

From the DE 26 48 055 A1 is a device for creating frame corner joints on door or window frames made of metal profiles known. Embossing tools punch out by means of pneumatic, hydraulic or mechanical force from the two corners close outer frame profile walls metal tongues, which are hineingeprägt in a corner angle, with a non-positive connection between two frame legs and the associated corner angle. The stamping and embossing tools are attached to located on both sides of the frame corner pivot pivotally arranged tool holders.

From the DE 27 39 731 A1 For example, there are known a corner bracket, method and apparatus for joining the corners of window and door frames made of metal hollow profile bars. The corner angle is used with its two legs in the open ends of the profile bars, wherein the side surfaces of the legs have transverse recesses into which parts of the profile wall are pressed by pressing tools. In this case, each leg of the corner angle associated pressing tools are driven synchronously.

A disadvantage of the known corner joint presses that manufacturing tolerances of the corner angle and the hollow profile lead to an inaccurate position of the corner angle to the tool. When pressing hollow profile and corner angle, it may therefore come to a loose connection in which the miter gaping. In addition, it can lead to visually undesirable damage to the profile wall and / or the anodization during pressing on the opposite side of the profile of the tongue when the embossing tool does not exactly engage in the notch of the corner connector.

Since an exact positioning of the tool and a production of corner joints without tolerances with reasonable effort are not possible, tolerances inevitably lead to loose or play corner joints and damage to the profile wall and / or the anodization.

task

The invention is therefore based on the object to provide a method and an apparatus for producing metal frames for windows or doors according to the preamble of claim 1 and of claim 5, in which a backlash-free, non-positive or positive corner connection is formed and visually undesirable damage be avoided at the profiles in the production of the metal frame.

Presentation of the invention

To solve the problem, a method with the features of claim 1 is proposed. According to the device, the object is achieved by the features of claim 5. Advantageous embodiments of the invention will become apparent from the respective dependent claims and the following description of the figures.

A method is provided for producing the corner connection of metal frames for windows or doors, in which two hollow profile bars, in particular aluminum profile bars and / or open sectional bars, are joined together via a miter cut and interconnected by a corner angle arranged in the hollow profile bars. The corner angle is provided with recesses, in particular notches or grooves, in which from the hollow profile bars by means of at least one tool previously cut tabs are pressed.

In a first step, a tab is cut by means of the at least one tool in the profile wall of the hollow profile bar. In a further step according to the invention, the tool is retracted after cutting the tab and moved by an offset in the recording parallel to the profile longitudinal axis in the direction of miter or parallel to the miter towards the frame outer corner. In a subsequent step, however, it may be preceded by further steps, is carried out by lowering the tool embossing of the tab in the recess, so that the free end of the tab along a slope of the recess or the notch of the corner angle pressed under deformation of the free end becomes and thereby one Force component is exerted on the corner angle in the direction opposite to the miter.

To generate the force component on the corner angle, the free end of the tab is pressed under deformation of the free end, for example, to form a bead, along the slope of the recess of the corner angle. As a result, the tab is wedged in the recess by the material of the tab is pressed against the slope of the recess. The tab, which is still in the region of the depression during the cutting process, is inserted into the depression during the actual embossing or pressing process, for example, forming the bead, where it is wedged. This creates a particularly strong connection of the hollow profiles with each other over the respective leg of the corner angle.

Possible manufacturing tolerances are compensated for by the plasticity of the tab material, by using the material of the tab as a kind of filler and displacing it in the direction of the bevel in the recess of the corner angle. When embossing or wedging the tab is used to move the corner angle in its final position and hold there. The cutting edge of the tab is pressed against the slope of the recess of the corner angle and pushes the corner connector in the end position. In this case, a force is exerted on the respective leg of the corner angle, so that the miter of the two profiles remains firmly closed.

According to a first preferred embodiment, it is provided that the offset is between 0.1 and 1.0 mm, preferably 0.5 mm. It has been found that the values for the profiles and materials which are usually to be machined are particularly favorable for bead formation, without there being any high forces and associated renewed damage to the hollow profiles during the production of the corner joint.

According to a further preferred embodiment it is provided that the at least one tool is moved perpendicular to the surface of the hollow profile or approximately parallel to the slope of the recess of the corner angle. In this way, different configurations of the tab, in particular the angle of intersection of the tab or the tab length and adaptation to different wall thicknesses of the hollow sections are possible.

According to a further preferred embodiment of the invention, it is provided that the two hollow profiles of the respective Rahmenecks are connected simultaneously with the corner angle by the each hollow profile associated tool when cutting the tabs, the rear hub, the process of the offset and lowering for embossing the tab is moved in the recess of the corner angle by a common drive. Due to the one common drive, a synchronous drive of the individual tools is possible by synchronously carrying out the individual work steps in the production of the frame corner. This reduces fault tolerances and increases the accuracy and strength of the connection. The assembly time is optimized by only one drive for multiple tools. In addition to lower cycle time, the manufacturing costs of the device can also be reduced.

According to an independent idea of the invention, a device is provided, in particular for carrying out the described method. The advantages achieved by the method apply in the same way for the sibling device claim.

According to a first preferred embodiment of the device according to the invention it is provided that the tool is formed as a punching tool with respect to the surface of the hollow profile rod to be machined edge and an obliquely extending free surface, which together form a cutting edge of the tool. This advantageous embodiment of the tool as a punching tool efficient production of the tab is possible because the surface of the hollow profile is easy to pierce. Because due to the formation of the cutting edge in the form of the vertical edge and the obliquely extending free surface initially acts only the tip of the cutting edge on the surface of the hollow profile and pierces it. Upon further application of force to the tool, the tab is formed. After a subsequent rearward stroke, the at least one tool is then moved from an initial position by an offset to an end position. Then, the formed tab is pressed according to the slope of the free surface in the recess and finally, for example, to form a bead, embossed. This creates the firm connection between the leg of the corner angle and the associated hollow profile.

According to a further advantageous embodiment of the invention it is provided that the free surface extends substantially parallel to the adjoining the slope portion of the recess. Of course, the section can also be designed just. Due to the design of the free surface is given a defined position of the tab in the recess, whereby the force component resulting on the legs of the corner angle this leg so moves into the respective hollow sections that the miter is closed and a particularly good hold of the hollow sections is given.

According to a preferred development of the device, each hollow profile of a frame corner is assigned at least one, preferably in each case two, tools. Through the use of multiple tools, the strength of the connection of the hollow profiles is increased with the respective legs of the corner angle. The tool can also be designed as a double tool, wherein each part tool has a cutting edge, which is formed of flank and free surface. Due to the design of the tools as a double tool an increased holding force of the corner joint is given.

In an alternative preferred embodiment, the at least one tool has an obliquely directed away from the miter of the hollow profile rod to be machined shank on. Due to the obliquely directed away shaft, the tool is moved obliquely to the surface of the hollow profile, so that the edge or the cutting edge of the tool during cutting as well as the embossing or wedging is moved approximately parallel to the slope of the recess of the corner angle. The distance between the cutting edge or edge of the tool and bevel remains approximately the same, which is deformed compared to the embodiment with vertical stroke of the tool on the tread surface more material of the tab and, for example, a larger bead formation is possible, allowing greater tolerance compensation. This results in a larger force component compared to the vertical stroke on the corner angle and thus a firmer corner joint.

In a preferred embodiment of the invention, it is provided that the tools provided for machining the two hollow profiles of a frame corner are arranged on a common tool holder which can be moved parallel to the miter of the frame corner on at least one guide. This ensures a synchronous movement of several tools. By a single drive the manufacturing cost of the machine are lower. In addition, there is a lower cycle time, which saves production costs.

According to a further advantageous embodiment, it is provided that the tool holder together with the guide at a perpendicular to a receiving plane is held for the frame corner movable traverse. As a result, a very compact construction of the device is possible, whereby mounting space capacities are optimized.

Other objects, advantages, preferred features and applications of the present invention will become apparent from the following description of an embodiment with reference to the drawings.

• Fig. 1 einen Teil einer bevorzugten Ausführungsform der erfindungsgemäßen Vorrichtung mit zwei Hohlprofilen vor dem Herstellen der Eckverbindung,
• Fig. 2 eine weitere Darstellung der erfindungsgemäßen Vorrichtung mit Werkzeugen, Werkzeughalter, Spanneinrichtung für die Hohlprofile und Aufnahme,
• Fig. 3 eine schematische Darstellung eines Rahmenecks in Draufsicht in Ausgangs- und Endstellung der Werkzeuge,
• Fig. 4 eine zeitliche Abfolge eines Werkzeuges bei der Herstellung eines Rahmenecks,
• Fig. 5 Detaildarstellungen der Bereiche A und B der Figuren 4c und 4f.
• Fig. 6 eine zeitliche Abfolge eines Werkzeuges bei der Herstellung eines Rahmenecks und
• Fig. 7 Detaildarstellungen der Bereiche C und D der Figuren 6c und 6f.

Show it:

• Fig. 1 a part of a preferred embodiment of the device according to the invention with two hollow sections before the corner connection is made,
• Fig. 2 a further illustration of the device according to the invention with tools, tool holder, clamping device for the hollow profiles and recording,
• Fig. 3 a schematic representation of a frame corner in plan view in the initial and final positions of the tools,
• Fig. 4 a time sequence of a tool in the production of a frame corner,
• Fig. 5 Detailed representations of areas A and B of FIGS. 4c and 4f ,
• Fig. 6 a time sequence of a tool in the production of a frame corner and
• Fig. 7 Detailed representations of the areas C and D of the FIGS. 6c and 6f ,

In FIG. 1 the device for producing a corner joint of metal frame of hollow profiles 1 for windows or doors is shown in an exploded view.

A frame corner 20 consists of two mitred 2 cut hollow sections 1, which are connected to each other by means of a corner angle 3. Each leg of the corner bracket 3 has at least one recess 4, which is formed in the embodiment selected here as a notch or throat.

The notch or throat has a bevel 12 and a section 13 adjoining the bevel 12. The two mitered 2 hollow sections 1 are each pushed onto a leg of the corner angle 3 together and inserted into the device for producing the corner joint and fixed with a clamping device 24.
The device in each case has a tool 5 assigned to a hollow profile 1 of the frame corner 20, which in the present case is designed as a double tool with a flank 15 and an open surface 16 which define a cutting edge 6.

Like from the FIGS. 1 and 2 It can be seen that each hollow section 1 of a frame corner 20 at least one, preferably two tools 5 assigned.

FIG. 2 shows the attachment of the tools 5 to a common tool holder 19, which is arranged parallel to the miter 2 of the frame corner 20 on at least one guide 21 in the machine movable. The tool holder 19 are held together with the guide 21 on a perpendicular to a receiving plane 22 for the frame corner 20 traversable traverse 23.

In FIG. 3 is an already assembled frame corner 20 with outer corner 18 in a view from above, from the direction of the tools 5 shown. In the manufacture of the corner joint, the tools 5 are moved by an offset d by being moved from a starting position to an end position.

In FIG. 4 is a temporal sequence of the steps for producing a corner joint of metal frame of hollow sections 1 for windows or doors shown in a schematic representation. For the production of metal frame two hollow profile bars 1 are joined together via a miter cut and by a in the Hollow section bars arranged corner angle 3 connected together. For the production of a finished frame, therefore, a total of four of these production steps are required.

In the subfigures 4a to 4f, a part of the hollow profile 1 with a hollow profile surface 14 and a corresponding part of the corner angle 3 is shown in each case. A detailed view of the area A or B of FIGS. 4c and 4f is in FIG. 5 shown. FIG. 4a shows a first step for producing a corner joint. In this case, two hollow sections 1 to be joined, in each of which one leg of the corner angle 3 is located, are positioned and fixed in a receiving plane 22 of the assembly table. This is done by the two previously cut miter 2 hollow sections 1, in which previously the legs of the corner angle 3 were inserted, placed on the receiving plane 22 and fixed by means of a clamping device 24.

To produce the connection of the two hollow sections 1 in the corner angle 3, the at least one tool 5 or the double tool is designed as embossing or punching tool.

According to the FIGS. 4a to 4f an embodiment with a tool 5 with a substantially perpendicular to the profile longitudinal axis 7 aligned shaft 17 of the tool 5 is shown. In an alternative embodiment, the tool 5 can also have a shank 17 directed obliquely away from the miter of the hollow profile rod 1 to be machined. This alternative embodiment is in the FIGS. 6 and 7 shown. The corresponding in FIG. 6 shown working steps those in FIG. 4 , In the FIGS. 7a and b are corresponding detailed representations

The tool 5 is moved obliquely to the surface 14 of the hollow profile 1, so that the edge 15 and the cutting edge 6 of the tool 5 during cutting as well as the embossing or wedging is moved approximately parallel to the slope 12 of the recess 4 of the corner 3 , The distance between the cutting edge 6 and edge 15 of the tool 5 and bevel 12 thus remains approximately the same. As a result, in comparison to the embodiment with vertical stroke of the tool 5 on the surface 14 of the hollow section 1 more material of the tab 9 is deformed and there is a larger bead 11, which allows a greater tolerance compensation, as in FIG. 7b shown detail view of the area D shows. This results in a larger force component compared to the vertical stroke on the corner 3 and thus a firmer corner joint.

The tool holder 19 with the associated tools 5 is movable parallel to the miter 2 according to the embodiment chosen here. A control or regulating device detects the region of the slope 12 of the recess 4 of the corner angle 3 and moves the tool 5 in the region of the slope 12th

FIG. 4b shows the positioning of the tool 5 with the flank 15 on the surface 14 of the hollow profile 1, preferably in the region of the transition of the flat surface of the corner angle 3 to the recess 4 of the corner 3. It should be noted at this point that the flank 15 does not have to be positioned exactly at the edge of the transition of the flat surface of the corner angle 3 to the recess 4.

In a further step, a tab 9 is cut by means of the tool 5 in the profile wall 8 of the hollow profile bar 1 by the tool with the flank 15 and the free surface 16, the surface 14 of the hollow profile 1 perpendicular to the profile longitudinal axis 7 penetrates, as in Figure 4c is shown. FIG. 5a shows an enlarged detail view of this step according to Figure 4c ,

In a further step, after cutting the tab 9, the tool 5 is withdrawn. Then, the tool 5 is moved parallel to the miter 2 from the initial position in the region of the slope 12 of the recess 4 in the end position or offset, as in FIG. 4d is shown. The tool 5 is thus opposite to the position of the tool 5 according to the FIGS. 4c respectively. FIG. 5a between 0.1 and 1.0 mm, preferably offset by about 0.5 mm.

After the tool 5 with offset d is positioned in the region of the slope 12, as shown in FIG Figure 4e is shown in a further step, an embossing of the tab 9 in the recess. 4

In the working stroke of the tool 5, the free end 10 of the tab 9 slides to form a bead 11 along the slope 12 of the recess 4 along, thereby adjusting a resulting from the stroke of the tool 5 force component on the corner 3. The force component is transmitted through the bead 11 of the tab 9 on the slope 12. The same happens of course with the second hollow section 1 for this frame corner. As a result, the miter 2 is firmly closed.

Due to the force component on the two legs of the corner angle 3, a resultant force on the hollow sections 1, so that the miter of the two hollow sections 1 is closed. This creates a backlash-free, non-positive or positive corner connection and visually undesirable damage to the profiles in the production of metal frames are avoided.

LIST OF REFERENCE NUMBERS

1

Hollow-section bar

2

Miter cut, miter

3

corner angle

4

recess

5

Tool

6

cutting edge

7

Profile longitudinal direction

8th

profile wall

9

flap

10

free end of the tab

11

bead

12

slope

13

section

14

Surface of the hollow profile

15

flank

16

open space

17

shaft

18

outside corner

19

toolholder

20

Rahmeneck

21

guide

22

receiving plane

23

traverse

24

tensioning device

d

offset

Claims (11)

1. Method for manufacturing the corner joint of metal frames for windows or doors, in which two hollow profile rods (1), in particular profile rods made of aluminum and/or open profile rods, are joined together through a miter cut and are connected to each other by means of a corner angle (3) that is arranged inside the hollow profile rods (1), wherein the corner angle (3) is provided with recesses (4), in particular notches, into which lugs (9) are pressed that have previously been cut out from the hollow profile rods (1) by means of at least one tool (5), wherein, in a first step, a lug (9) is cut into the profile wall (8) of the hollow profile rod (1) by means of the at least one tool (5), characterized in that in a further step the tool (5) is retracted and is displaced by an offset d in the area of the recesses (4) in parallel to the profile's longitudinal axis (7) in the direction of the miter (2) or in parallel to the miter (2) in the direction of the external frame corner (18) after the lug (9) has been cut, so that, in a subsequent step, the lug (9) is stamped on inside the recess (4) by lowering the tool (5), so that the free end (10) of the lug (9) is pressed along a chamfer (12) of the recess (4) of the corner angle (3) while a deformation of the free end (10) takes place, with a force component being exerted on the corner angle (3) in the direction that is opposite to the miter (2).
2. Method according to claim 1, characterized in that the offset d is between 0.1 and 1.0 mm, preferably 0.5 mm.
3. Method according to claim 1 or 2, characterized in that the at least one tool (5) is displaced perpendicularly to the surface (14) of the hollow profile (1) or approximately in parallel to the chamfer (12) of the recess (4) of the corner angle (3).
4. Method according to one of the preceding claims, characterized in that the two hollow profiles (1) of the respective frame corner (20) are connected to the corner angle (3) at the same time by moving the tools (5) assigned to each hollow profile (1) by means of a common drive during cutting of the lugs (6), during rear lifting, during displacement by the offset d, and during lowering for the purpose of stamping on the lug (9) inside the recess (4).
5. Device for manufacturing metal frames for windows or doors in which two hollow profile rods (1), in particular profile rods made of aluminum and/or open profile rods, are joined together through a miter cut (2) and can be connected to each other by means of the corner angle (3), wherein the corner angle (3) is provided with recesses (4), in particular notches, which respectively have one chamfer (12) into which lugs (9) are pressed that have previously been cut out from the hollow profile rods (1) by means of at least one tool (5), in particular for carrying out the method according to any of the claims 1 to 4, characterized in that a control or regulation device is provided for displacing the tool (5) by an offset d in the area of the recesses (4) in parallel to the profile's longitudinal axis (7) in the direction of the miter (2) or in parallel to the miter (2) in the direction of the external frame corner (18), with the control or regulation device detecting the area of a chamfer (12) of the recess (4) of the corner angle (3) and being configured for the purpose of displacing the tool (5) inside of or into the area of the chamfer (12) in a corresponding manner.
6. Device according to claim 5, characterized in that the tool (5) is embodied as a punching tool with a flank (15) that is perpendicular with respect to the surface (14) of the hollow profile rod (1) to be processed and with a free surface (16) that extends obliquely thereto, which together form a cutting edge (6) of the tool (5).
7. Device according to claim 6, characterized in that the free surface (16) extends substantially in parallel to the section (13) of the recess (4) that connects to the chamfer (12).
8. Device according to any of the claims 5 to 7, characterized in that at least one and preferably respectively two tools (5) are assigned to each hollow profile (1) of a frame corner (20).
9. Device according to any of the claims 5 to 8, characterized in that the at least one tool (5) has an oblique shaft (17) that is facing away from the miter (2) of the hollow profile rod (1) to be processed.
10. Device according to any of the claims 5 to 9, characterized in that the tools (5) that are provided for processing the two hollow profiles (1) of a frame corner (20) are arranged at a common tool holder (19) which can be displaced in parallel to the miter (2) of the frame corner (20) at at least one guide (21).
11. Device according to one of the preceding claims, characterized in that the tool holder (19) is supported together with the guide (21) at a crossbar (23) that is displaceable perpendicularly with respect to a reception plane (22) for the frame corner (20).

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