EP0121873A2 - Method and apparatus for bending spacekeeping profiles for thermopane glasses - Google Patents

Abstract

1. A method of bending hollow spacekeeping profiles filled with drying agent for thermopane glasses, the profile in question being grasped, in particular in front of and behind a centre of motion, and being bent about the centre of motion preferably by about 90 degrees, characterized in that during the bending process the outside (7) of the bend (6) being formed is milled, rolled, hammered and/or kneaded by means of a sliding member of the like and is thereby extended, stretched or elongated and that the drying agent located in the interior of the hollow profile (2) is displaced from the outside (7) of the bend (6) partly from the area of curvature during the bending process.

Description

The invention relates to a method for bending hollow, filled with desiccant spacer profiles for insulating glass panes, wherein the respective profile is detected in particular in front of and behind a pivot point and is bent about the pivot point - preferably by 90 °.

The invention further relates to a device for bending a hollow spacer profile for insulating glass panes filled with desiccant, with a tensioning device lying approximately in the feed direction of the profile and a; Device for grasping the leg to be bent and an abutment for fixing the inside of the curvature.

From US Pat. No. 4,261,145, it is already known to bend spacer profiles for insulating glass panes filled with desiccant in order to avoid the previously remaining connections of individual frame parts in their corner area. For a spacing inner frame for insulating glass panes, therefore, it is no longer necessary to miter and cut four individual profile pieces, and above all be carefully sealed, but then a single connection at the joint of the frame is sufficient, which does not have to lie in the corner, which is difficult to seal. Difficulties arise from the problem that on the one hand the tightest possible bend is desired so that the profile is later invisible in the window frame as far as possible in the corner areas, but on the other hand the outside of the profile tends to burst due to the filled in drying agent, especially with a narrow radius of curvature .

It has therefore already been described in DE-PS 30 47 338 a spacer profile for insulating glass panes, in which a volume area, preferably the area lying outside during the bend, remains free of desiccant, so that it can easily participate in the bending movement without tearing. Such a profile has proven itself, but with regard to the required good filling with desiccant, on the one hand, and the area remaining free thereof, on the other hand, causes a relatively expensive production.

Attempts have also already been made to facilitate the bending process and to avoid undesirable bursting that occurs, that punctures, notches and the like later on the inside. Similar weakenings were provided. However, since the desiccant is ground and crushed during the bending process, dust particles and desiccant particles can fall into the space between the insulating glass pane at these openings in the spacer profile for a long time, especially since the two panes kept apart from the profile, especially in the case of larger insulating glass panes Carry out relative movements to each other and can exert suction on the profile.

There is therefore the task, above all to provide a method, but also a device of the type mentioned, with which relatively inexpensive spacer profiles can be bent with a small radius of curvature despite filling with desiccant, without tearing the profile outside and without unsightly dents, folds or tears appear on the inside.

The solution to this problem is, above all, that during the bending process at least the outside of the bend or curvature that arises additionally mechanically. pressurized and thereby at least partially plastically deformed and elongated.

It is particularly expedient if the outside of the bend is rolled, rolled, hammered and / or kneaded by means of a slider or the like at least during the bending process.

Experiments have shown that such an additional deformation and stretching process on the one hand desirably displaces the desiccant from the bending area in a desired manner, so that the bending from the inside of the profile is no longer opposed to such a great extent and . the profile back can be given a larger radius of curvature, and in addition that the material on the outside of the profile itself is stretched, stretched, elongated and / or rolled out, so that tearing is avoided even with a narrow radius of curvature. Nevertheless, it is not necessary that the outer area of the profile remains free of dry media. A relatively inexpensive hollow profile with normal desiccant filling can therefore be used.

Advantageously, the desiccant located in the interior of the hollow profile can be partially displaced out of the region of curvature from the outside of the bend during the bending process and, at the same time, the profile outside - as already mentioned - can be elongated or stretched, preferably rolled out. It is also conceivable for the profile side walls to be at least partially elongated or rolled out, which at least close to the outside of the profile also undergo stretching during bending.

An embodiment of the method according to the invention of particular importance can consist in the fact that the bending area of the profile is deformed several times during the bending process, in particular with high frequency, alternately in one and the other direction of the profile course, in particular cold rolled. Such a back and forth movement of the rolling process displaces the desiccant particularly well and results in the desired rolling out of the profile material, so that the bending process itself can be carried out in a relatively short time.

It has proven to be expedient if a profile region of approximately 2 cm or less, preferably approximately one cm in length, of the profile is additionally deformed, preferably cold, in particular rolled at a high frequency. It is possible for at least 10 to 40, possibly about 30 hammering or rolling operations per second to be carried out on the bending area during the bending process. This is possible above all through the advantageous back and forth movement of the rolling, which can take place at a correspondingly high frequency.

Above all, the later apex area of the bie tion of the profile additionally processed, in particular rolled. In this context, it is particularly advantageous if the profile area is additionally deformed, which begins before the apex of the bend and extends approximately to the apex or just behind it. As a result, the additional molding process during the bend can force and roll some material into the particularly stressed apex region of the bend, so that the stretching of the material carried out there is well supported.

The above-mentioned device for bending a hollow spacer profile for insulating glass panes filled with desiccant, which has a tensioning device lying approximately in the feed direction of the profile and a device for detecting the leg to be bent, as well as an abutment for fixing the inside of the resulting curvature, can be the solution the task also mentioned above can be characterized by at least one tool acting on at least the outer region of the bend for mechanical plastic deformation, in particular elongation or extension of the outer region during the bending process. It is particularly advantageous and expedient if a pressure roller or the like lying with its axis of rotation parallel to the bending axis is provided as a tool for plastically deforming the outside of the profile during its bending, which, under contact pressure, relative to that of the bending mandrel or the like. Abutment facing away side of the profile can be moved back and forth and pushed forward or pressed transversely to this back and forth movement.

This results in a rolling tool, the drive of which on the one hand allows a rapid back and forth movement, but at the same time a good adaptation to the ever increasing curvature during the back and forth

Movement is enabled. In this way, the desired rolling of the profile material in the bending area is also carried out in the final phase of the bending.

A particularly expedient embodiment of the device according to the invention can consist in that the roller is arranged at the end of a pivoting lever which can be driven for the back-and-forth movement in the pivoting direction and that in addition an effective device in the direction of this lever is provided for pressing the roller. The use of swivel levers for the drive allows different ratios or reductions depending on the relation of the distances between the points of attack of the drive devices, the pressure roller and the swivel bearing, in order to be able to match corresponding forces, paths and / or speeds.

Refinements and modifications of the drive of the roller are the subject of claims 12 to 16.

A spike-shaped abutment can be provided, around which the profile can be bent, and this abutment can simultaneously form the inner end of a flap or the like which can be pivoted about its center and which lies against the inside of the leg to be bent during the bending process and together with it an outer bending tool or the like. Aligned and kept straight. This prevents the leg to be bent from experiencing uncontrolled curvatures at a distance from the abutment.

On the top of the mandrel, a stop or the like which overlaps the profile to be bent can be provided. During the bending process, the side surface is above all against buckling or buckling secured at the top.

Further refinements, in particular of the shaping tool, the clamping devices and possibly related ejectors or the like, are the subject of claims 19 to 23.

Especially when combining one or more of the features and measures described above, there is a method and also a device with which profiles are not only made of easily deformable metals such as aluminum alloys. can be bent with narrow radii of curvature, but which also allows analog processing of steel profiles. The rolling frequencies and / or the pressing force can be selected and set in order to take into account different profile thicknesses, materials or the like. Modifiable sizes on the profiles to be deformed.

It should also be mentioned that as a tool for lengthening or stretching the outside of the bend, an impact tool, preferably an impact tool that can be moved along the bend or a press-on slide, kneading tool or the like, can be provided. However, preference is given to a roller or roller that can carry out a constant and effective material displacement. B. has to overcome less resistance compared to a slider due to its rollability.

Overall, there is a method and also a device with which, despite the hard and practically incompressible desiccant, a hollow spacer profile with narrow radii can be bent, so that it is well suited as an inner frame for an insulating glass pane, which also shows a clean inside corner in the curvature area, but can be practically invisible from the side in the window frame.

The invention is described below with its details that are essential to it with reference to the drawing in an exemplary embodiment.

• Fig. 1 eine Ansicht einer Ausführungsform der Erfin- . dung, bei welcher an dem Antrieb einer Walze zum zusätzlichen Verformen der Außenseite eines Abstandhalter-Profiles zwei sich kreuzende Schwenkhebel vorgesehen sind, und
• Fig. 2 eine Ansicht einer abgewandelten Ausführungsform der Erfindung, bei welcher die Andrückvorrichtung für die Druckwalze unmittelbar in Längsrichtung an dem Schwenkhebel der Walze angreift.

It shows in a schematic representation:

• Fig. 1 is a view of an embodiment of the inven-. manure, in which two intersecting pivot levers are provided on the drive of a roller for additionally deforming the outside of a spacer profile, and
• Fig. 2 is a view of a modified embodiment of the invention, in which the pressing device for the pressure roller acts directly in the longitudinal direction on the pivot lever of the roller.

In both exemplary embodiments, a device designated as 1 for bending a hollow spacer profile 2 filled with desiccant has a tensioning device 3 lying in the feed direction of the profile 2 and a device 4 for detecting the leg 2 a of the profile 2 to be bent. Furthermore, the device 1 includes an abutment, in the exemplary embodiment an abutment mandrel 5, for fixing the inside of the curvature 6. In both drawings, the bending process in which the leg 2 a to be bent is bent by 90 ° with respect to the original profile 2 profile has just ended.

It is essential that at least the outside 7 of the resulting bend 6 is additionally rolled during the bending process. In this case, the desiccant located in the interior of the hollow profile 2 can be partially displaced from this area of curvature from the outside of the bend 6 during the bending process and at the same time the profile outside can be stretched, elongated and rolled out. Above all, the bending area 6 of the profile 2 can be rolled several times, in particular with a high frequency, alternately in one and the other direction of its course during the bending process. Above all, the - profile outside 7 is rolled out like a piece of cake and thus receives a correspondingly larger dimension, which is desired on the outside of the bend 6, so that the desiccant located inside, which can only be partially displaced, does not blow this outside of the profile through the bend .

One can now see in both exemplary embodiments a pressure roller 10 with its axis of rotation 8 parallel to the bending axis 9, which can be moved back and forth under contact pressure relative to the outside 7 of the profile 2 facing away from the bending mandrel 5 and thereby displaceable or transversely to this back and forth movement. can be pressed.

The pressure roller 10 is arranged for this purpose at the end of a pivot lever 11 which can be driven for the back and forth movement according to the double arrow Pf 1 in the pivoting direction, in addition an effective in the direction of this pivot lever 11, to be described in more detail below, for pressing the pressure roller 10 is provided. This pressing device enables a certain advance of the pressure roller 10 in the direction of the pivoting lever 11 carrying it, so that an adaptation to this retraction especially with the ever increasing curvature - of the workpiece to be machined while maintaining the required contact pressure is possible. For example, a profile area of approximately 2 cm in length or less, preferably approximately one cm in length, can be rolled. It can be seen in the figures that the profile area of the outside 7 of the curvature 6 is rolled, which begins in front of the actual apex 12 of the later finished bend 6 and extends approximately up to this apex 12 or preferably just behind it. As a result, material is repeatedly pushed and rolled into the area that should flow somewhat in the direction of profile 2 due to the bending movement according to arrow Pf 2.

In both exemplary embodiments, for the back and forth movement of the pivot lever 11 carrying the roller 10, a working cylinder 13 acts transversely to the lever 11 on the latter outside of its pivot point 14. Such pneumatic or hydraulic working cylinders are known, which can be reversed at the desired high frequency in order to allow the rapid reciprocating movement of e.g. B. 10 to 40 z. B. 30 rolling movements per second.

In the exemplary embodiment according to FIG. 1, a second pivot lever 15 acts on the pivot lever 11, the pivot direction of which is oriented essentially in the direction of the first pivot lever 11 carrying the roller 10, which shapes the pivot bearing 14 of this first pivot lever 11 and on which an adjusting element 16, preferably attacks another pressure cylinder or the like. The two pivot levers 11 and 15 thus intersect and can be pivoted towards one another at their crossing point, namely the pivot bearing 14. In the exemplary embodiment, the adjusting element 16 is a working and pressure cylinder and engages at one end of the second lever 15 while this second pivot lever 15 is in turn pivotally mounted about a point 17, which is opposite to the attack of this pressure cylinder 16 at the crossing point 14.

In the exemplary embodiment according to FIG. 2, the pressure cylinder 16 acts directly on the end of the pivot lever 11 opposite the roller 10, while the working cylinder 13 which generates the back and forth movement of the pivot lever 11 in turn pivots between the roller 10 and this pressure cylinder 16, for example approximately in the Middle attacks.

The distances between the pivot bearing 17 and the attack of the adjusting element 16 are selected in the exemplary embodiment according to FIG. 1 for a pressure ratio of approximately 2: 1 in the sense of a _' pressure intensification. 1, a pressure translation can be achieved, while in the exemplary embodiment according to FIG. 2, such a pressure translation option is dispensed with in the interest of the simplest possible design.

The mandrel-shaped abutment 5 has already been mentioned, around which the profile 2 can be bent. This abutment 5 can simultaneously form the inner end of a flap 18 which can be pivoted about its center 9 and which bears against the inside of the leg 2 a to be bent during the bending process and aligns and holds it together with the outer bending tool 4. On the upper side of the mandrel 5, a stop which overlaps the side surface of the profile 2 and which can prevent bulges in this area is provided in a manner not shown in detail. This stop can be moved at right angles to the side surface, after it has been bent to be able to release the process well.

In the direction of advance of the profile 2 in front of the bending point, the clamping device is provided, the movable clamping jaw 3 of which can be pressed from the outside against the side of the profile, the continuation of which forms the outside 7 of the bend 6 to be produced. A corresponding abutment 19 is provided on the inside. If necessary, the clamping jaw 3 can, in addition to its movement at right angles to the profile 2, perform a clamping movement against the base of the profile 2 and overlap the edge of the profile 2 in order to improve the fixation and alignment.

In particular for profiles 2 with inward flanges, an ejector 20 can be provided, the plunger 21 of which can engage the profile, preferably in the region of the inside of the curvature produced by the bending process, when the bending is complete and the rolling tool and the clamping jaw and bending tool are removed from the Profile area are sufficiently far away.

It should also be mentioned that the rolling frequency and / or the pressing force can be selected and adjusted so that different profile thicknesses, materials and. Like. Can be taken into account so that not only aluminum profiles, but also steel profiles can be bent in the manner according to the invention.

Instead of the exemplary embodiments described, in which an additional deformation takes place on the outside 7 of the bend 6 of a profile 2 to be bent with the aid of a roller 10, another additional plastic deformation and elongation in this area is also possible during the bending process. For example, the Outside 7 of the bend 6 are hammered at least during the bending process or kneaded or rolled by means of a sliding piece or mechanically placed under an appropriate pressure in some other way. Accordingly, a striking tool, preferably a striking tool displaceable along the bending 6, or a press-on slide, kneading tool or the like could be provided as a tool for lengthening the outside 7 of the bend 6. The outer side would therefore similarly to the embodiments described above on the one hand acted upon by this tool, which is on the other hand moved _'along the bend. 6 However, a rollable or rollable tool in accordance with the roller 10 described above is preferred because this results in a constant displacement of the material with at the same time the lowest possible resistance to the aforementioned feed movement.

Instead of the working cylinder 13, other adjusting elements on the pivot lever 11 can attack, for. B. an electric or pneumatic motor with a corresponding push or pull rod or a type of connecting rod. Furthermore, it is possible for an adjusting motor to engage the lever 11 directly at the pivot point 14 in order to move it in the manner described above.

All features and construction details shown in the description, the claims, the summary and the drawing can have significant meaning both individually and in any combination with one another.

Claims (24)

1. A method for bending hollow, desiccant-filled spacer profiles for insulating glass panes, the respective profile being detected in particular in front of and behind a fulcrum and preferably being bent about the fulcrum by about 90, characterized in that the outside (7 ) the resulting bend (6) is additionally subjected to mechanical pressure and is at least partially plastically deformed and elongated. 2. The method according to claim 1, characterized in that the outside (7) of the bend (6) is rolled, rolled, hammered and / or kneaded by means of a slider or the like at least during the bending process. 3. The method according to claim 1 or 2, characterized in that the desiccant located in the interior of the hollow profile (2) during the bending process from the outside (7) of the bend (6) partially displaced from the area of curvature and at the same time the profile outside (7) is stretched, stretched, elongated and / or rolled out. 4. The method according to claim 1 or 2, characterized in that the bending region (6) of the profile (2) is deformed several times during the bending process, in particular at high frequency alternately in one and the other direction of the profile profile, in particular cold rolled. 5. The method according to any one of claims 1 to 4, characterized in that a profile area of about 2 cm or less, preferably about one centimeter length of the profile is additionally deformed during the bending process, preferably cold rolled. 6. The method according to any one of claims 1 to 5, characterized in that at least 10 to 40, optionally about 30 hammering or rolling processes per second are carried out on the bending area during the bending process. 7. The method according to any one of claims 1 to 6, characterized in that the later apex region of the bending of the profile is additionally processed, in particular is rolled. 8. The method according to any one of claims 1 to 7, characterized in that the profile region is additionally deformed, in particular rolled, which begins before the apex of the bend and extends approximately to the apex or shortly after. 9.Device for bending a desiccant-filled hollow spacer profile (2) for insulating glass panes with a tensioning device lying approximately in the feed direction of the profile (2) and a device (4) for detecting the leg to be bent (2a) and an abutment (5 ) for fixing the inside of the resulting curvature (6), characterized by at least one tool acting on at least the outer region (7) of the bend (6) for mechanical plastic deformation, in particular elongation or extension of the outer region during the bending process. 10. The device according to claim 9, characterized by a with its axis of rotation (8) parallel to the bending axis (9) lying pressure roller (10) or the like. Which, under contact pressure relative to the mandrel (5) or the like. Abutment side (7) of the profile (2) can be moved back and forth and can be advanced or pressed transversely to this back and forth movement. 11. The device according to claim 9 or 10, characterized in that the roller (10) is arranged at the end of a pivoting lever (11) which is drivable for the reciprocating movement in the pivoting direction and in addition that in the direction of this lever (11) effective device for pressing the roller (10) is provided. 12. The device according to one of claims 9 to 11, characterized in that for the back and forth movement of the roller (10) carrying pivot lever (11) a working cylinder (13), electric or pneumatic motor with a push or pull rod or. Adjusting element transversely to the lever (11) on this outside of its pivot point (14) or an adjusting motor or the like. indirectly or directly on the pivot point (14). 13. Device according to one of claims 9 to 12, characterized in that a second pivot lever (15) engages on the pivot lever (11), the pivot direction of which is oriented essentially in the direction of the first pivot lever (11) carrying the roller (10), which carries the pivot bearing (14) of the first pivot lever (11) and on which an adjusting element (16), preferably a further pressure cylinder or the like, engages. 14. Device according to one of claims 9 to 13, characterized in that the two pivot levers intersect and are pivotable against one another at their crossing point (14) and that the adjusting element, in particular the working cylinder, engages at one end of the second lever (15) and in that the second pivot lever (15) in turn is pivotally mounted about a point (17) which is opposite the attack of the pressure cylinder (16) to the crossing point. 15. Device according to one of claims 9 to 14, characterized in that the pressure cylinder (16) acts directly on the roller (10) opposite end of the pivot lever (11) and the back and forth pivoting movement of the pivot lever (11) generating working cylinder (13) in turn pivots between the roller (10) and this pressure cylinder approximately in the middle. 16. The device according to one of claims 9 to 15, characterized in that the distances between the pivot bearing and attack of the adjusting element (16) are selected for a pressure ratio of about 2: 1 in the sense of a pressure boost. 17. Device according to one of claims 9 to 16, characterized in that a mandrel-shaped abutment (5) is provided, around which the profile (2) is bendable, and that this abutment (5) at the same time the inner end of one around its center ( 9) forms a pivotable flap (18) or the like, which bears against the inside of the leg to be bent (2 a) during the bending process and aligns and holds it together with an external bending tool or the like. 18. Device according to one of claims 9 to 17, characterized in that on the upper side of the mandrel a cross section or the like to be bent profile stop is provided. 19. The apparatus according to claim 18, characterized in that the one side surface of the profile in the region of the bend overlapping stop is movable perpendicular to this side surface. 20. Device according to one of claims 9 to 19, characterized in that a clamping device is provided in the feed direction of the profile (2) in front of the bending point, the movable clamping jaw (3) can be pressed from the outside against the side of the profile, the continuation of which Forms the outside (7) of the bend (6) to be produced. 21. Device according to one of claims 9 to 20, characterized in that at least one of the movable jaws (3) or the like. (4) in addition to their movement perpendicular to the profile (2), a clamping movement against the base of the profile (2nd ) and extends over the edge of the profile (2). 22. Device according to one of the preceding claims, characterized in that in particular for inwardly directed flanges or legs (29) having profiles ( ₂ ) an ejector (20) or the like. Provided, the plunger (21) preferably in the region of Attacks the inside of the curvature produced by the bending process. 23. Device according to one of claims 9 to 22, characterized in that the hammering or rolling frequency and / or the pressing force of the shaping tool (for example roller 10) can be selected and adjusted. 24. The device according to claim 9, characterized in that as a tool for lengthening the outside (7) of the bend (6), an impact tool, preferably a displaceable along the bend impact tool, or a press-on slide, kneading tool or the like is provided.

Images