EP0802001B1 - Device for bending the rim of a sheet - Google Patents

Description

The invention relates to a machine for bending one on one the first sheet metal part provided to a sheet metal edge with the first Sheet metal part to be connected with at least one second sheet metal part preferably driven form roller pair, the form rollers in Feed direction on opposite sides of the sheet edge roll on this along its longitudinal edge and its Roller gap inclined in the bending direction towards the second sheet metal part is, with one of the form rollers the sheet edge at the second Reaches under the sheet metal part facing, as well as with a cross effective support to the feed direction with at least one abut one of the sheet metal parts.

Such a machine is used as a folding machine for manufacturing known as Pittsburgh folds. The latter deals it is corner folds, such as those in cross-section rectangular air ducts made of sheet metal of and / or ventilation systems are provided. For saving Such transport ducts become parts of transport volumes delivered to the installation site. There is at least one Part of the canal wall forming a canal in the longitudinal direction extending pocket folded approximately S-shaped. One at the folded one Wall element abutting wall part is bent at right angles and is used to assemble the air duct in the described by one S-shaped pocket of the associated wall part inserted. The edge merging into the S-arm forming the pocket of the folded wall part projects beyond that on its longitudinal edge folded wall element. This protruding sheet edge is finally for the production of the fold connection by means of the usual Folding machine to the one under one at right angles to the wall part abutting the sheet metal edge and pressed against this. For this purpose the seaming machine at first approximately perpendicular to that abutting wall element extending sheet metal edge of the folded Wall part attached and in feed i.e. in the longitudinal direction of the Sheet metal edge along this. The one on the edge of the sheet Rolling form rollers of the pair of form rollers cause the inclination of their roller gap a bending of the Sheet metal edge towards the folded wall element. As a result of itself opposing forces developing to the applied bending forces the form rollers endeavors to achieve the desired one, in the feed direction and essentially perpendicular to the one in the starting position Movement plane running sheet edge to the free longitudinal edge of the To leave the sheet metal edge. To avoid such Directional deviation impairing the processing success is used on generic machines the support mentioned above with at least one abutment.

On the previously known seaming machine there is one as an abutment cylindrical support roller use attached to one of the machine base cantilever is attached. In the Working position is the previously known machine the corner area of the Comprehensive air duct braced across this. The machine is on one side of the channel corner over the Form rollers guided on the sheet metal edge to be bent and on the other Side of the channel corner on the support roller on the assigned Supported wall part of the air duct. So that the support role your Intended use according to a breakout of the seaming machine prevent the desired plane of movement is its axis of rotation at an acute angle to the assigned duct wall aligned. When the seaming machine moves in The support roller rolls accordingly with the in Circumferential direction of their base and tapering Edge formed jacket edge on the channel wall. It engages in a running in the longitudinal direction of the channel wall groove-like gap, which is in the folding of the concerned Wall part has resulted. Because of the intervention for Available gap is very narrow, the tapered Edge of the support roller should only be narrow. In addition, the Support roller to be adjustable to occur when bending the bag To be able to compensate for tolerances. Over the tapered The edge of the support roller becomes the clamping force by means of which the seaming machine is held in the corner area of the ventilation duct, introduced into the channel wall. As a result of the touch between the pointed edge of the support roller and the channel wall with simultaneous application of force to the support roller it becomes undesirable when using the previously known seaming machine Deformations and damage along the canal wall the trajectory of the support roller.

The object of the present invention is to remedy this disadvantage.

This object is achieved according to the invention in that one Machine of the type mentioned the abutment (s) Form roller pair is arranged lagging in the feed direction (are) and on the side facing the second sheet metal part supports the sheet metal edge. In the case of such Machine is the support to ensure the desired Movement path of the machine from the for deformation and damage susceptible to deformation and damage impaired in their function or in their appearance Areas of the sheet metal parts to be connected are moved out. The use of the according to the course of the role gap inclined sheet metal edge as an abutment opens up the possibility of a flat support of the machine without this in the Wall of one of the sheet metal parts to be joined together is a groove-like Intervention for the abutment or abutments should be provided. Unwanted deformations and damage to the sheet metal edge as a result of the support forces to be introduced due to the flat Power transmission prevented. In cases where there is nevertheless, deformations and / or damage occurs, is the functionality of the one to be connected with each other Sheet metal parts of the existing component are not impaired because the adjacent to the sheet metal edge used only as a connecting element Areas of the sheet metal parts definitely undamaged stay. In addition, there are deformations and, for example, superficial ones Any damage to that side of the Sheet metal edge, which after its bending on the assigned Sheet metal part comes to the plant and therefore after completion of the processing is hidden and not visible from the outside. The The advantages described arise, for example, from the invention Machines in the form of folding closing machines as well on machines according to the invention which are generally used for flanging a protruding sheet edge used to a second sheet metal part become.

Advantageously, according to a preferred variant of the invention, it is provided that as an abutment the support at least one that is supported on the sheet metal edge Sliding shoe is provided.

Damage and / or deformation in the area of the sheet metal edge preventive way of introducing supporting forces to be transmitted is in the case of a preferred variant of the invention thereby achieved that the (the) slide shoe (s) over a Support the sliding surface on the sheet metal edge (support).

Supplementary or alternative to one or more sliding shoes on a further preferred embodiment of the machine according to the invention as an abutment of the support at least one on the sheet metal edge abutment roller rolling in the feed direction is provided. The the feed of the machine opposite by its support Movement resistance is opposed when using support rollers Embodiments with sliding shoes reduced.

A preferred variant of the invention is characterized in that that as a counter role a role of a second pair of form rollers is provided, which is the first pair of form rollers in the feed direction is arranged lagging and its form rollers in this Direction on opposite sides of the sheet edge roll on this, the nip of the second pair of form rollers in the bending direction preferably stronger to the second Sheet metal part is inclined as the roller gap of the first pair of forming rollers. In this case, the second pair of form rollers can be used as a component the machine support can be used and thereby a Take on double function. Is his nip more inclined than the roller gap of the leading roller pair, it serves to that of the leading first pair of form rollers in a first Machining step bent towards the second sheet metal part To bring the edge of the sheet closer to the second sheet metal part; at the same time takes over the forming role of the sheet metal edge second form roller pair the task of a breakout of the machine counteracting abutment.

Multiple and therefore particularly effective support of the machine results in a preferred development of the invention when used of two pairs of form rollers arranged one behind the other in the feed direction in that the abutment of the support at least one arranged in the feed direction between the pairs of form rollers and / or at least one lagging the second pair of form rollers arranged slide shoe includes.

In principle, cylindrical machines can be used on machines according to the invention Form rollers are used, whose axes of rotation are then parallel to run the nip. However, it is preferred according to the invention an embodiment in which the form rolls of the first and / or the form rollers of the second pair of form rollers are conical are. The axes of rotation of the form rollers run in this Fall perpendicular to the feed direction.

Generic machines are known, which one on the second sheet metal part resting and with the machine in the feed direction have sliding guide plate. Such Machine is modified in accordance with a preferred embodiment of the invention in that as an abutment of the support at least one of the guide plate projecting to the sheet metal edge is provided.

With bending over to the second sheet metal part step on the Edge elastic restoring forces due to which the Sheet metal edge is striving towards its starting position spring back. These reset movements are due to use of abutments according to the invention, via which the to be initiated Support forces support the return movement in the sheet metal edge are introduced, reinforced. To such for the processing success disadvantageous reset movements avoid, it is provided according to a preferred embodiment that at least one the side of the sheet metal edge facing away from the abutment of the support arranged form roller on the mentioned side with a support approach outside the sheet metal edge on the one provided with the sheet metal edge first sheet metal part. The support approach acts as a movement the bent sheet metal edge in the direction of its starting position opposite.

In the case of a preferred variant of the machine according to the invention, in which at least one on the side of the sheet metal edge facing away from the abutment of the support arranged form roller is conical, serves as Support lug in the axial direction from the form roller (s) protruding support cylinder.

So that the machine is supported effectively even when changing Sheet thicknesses can be guaranteed, is in a preferred development Invention at least one abutment of the support perpendicular to the sheet metal edge adjustable.

Also the adaptation of the machine to changing sheet thicknesses it is used that in a further preferred variant of the invention, the form rollers at least one pair of form rollers, in particular also the Form rollers of the pair of form rollers serving as abutment of the support, for setting the width of the roller gap in the transverse direction the sheet metal edge are adjustable relative to each other. The mentioned feature also opens up the possibility of the machine to be placed anywhere on the edge of the sheet or at any point Remove the edge of the sheet metal from this. Here are the Form rollers preferably by means of an adjusting device relative adjustable to each other.

An automatic adjustment of the roller gap to changing ones Sheet thicknesses, for example also in the case of dimensional tolerances one and the same sheet metal part, is on one machine enables at least one form roller at least a pair of form rollers resilient in the transverse direction of the sheet metal edge is stored.

On generic machines, a pressing device Be used, which is used by means of the form rollers bent sheet metal edge of the first sheet metal part to complete the Press the machining process on the second sheet metal part. On known ones For this purpose, machines become one with the machine in Feed direction of moving slide block used. Such machines are further developed according to the invention in that as a pressing device one of the form rollers and the abutment (s) cylindrical roller lagging the support in the feed direction is provided, the axis of which is parallel to the plane of the second sheet metal part runs. The tendency of the machine to leave the desired trajectory when using a cylindrical roller as a pressing device is less than when using a Sliding blocks. The support of machines according to the invention on the This simplifies the edge of the sheet.

Fig. 1

eine schematische Darstellung der wesentlichen Komponenten einer Falzschließmaschine,

Fig. 2

einen offenen Pittsburgh-Falz,

Fig. 3

einen geschlossenen Pittsburgh-Falz,

Fig. 4

eine Falzschließmaschine des Standes der Technik,

Fig. 5

eine Schnittdarstellung der Falzschließmaschine nach Fig. 1 in der dort gezeigten Schnittebene V,

Fig. 6

eine Schnittdarstellung der Falzschließmaschine nach Fig. 1 in der dort gezeigten Schnittebene VI und

Fig. 7

eine Schnittdarstellung der Falzschließmaschine nach Fig. 1 in der dort gezeigten Schnittebene VII.

The invention is explained in more detail below on the basis of schematic representations of an exemplary embodiment. Show it:

Fig. 1

1 shows a schematic illustration of the essential components of a seaming machine,

Fig. 2

an open pittsburgh fold,

Fig. 3

a closed Pittsburgh fold,

Fig. 4

a prior art seaming machine,

Fig. 5

1 in the sectional plane V shown there,

Fig. 6

a sectional view of the folder closing machine of FIG. 1 in the section plane VI and shown there

Fig. 7

a sectional view of the folder closing machine of FIG. 1 in the section plane VII shown there.

According to FIG. 1, a folding closing machine 1 is used, the machine base of which 24 is indicated by dash-dotted lines, for production a ventilation duct with a rectangular cross section. It is between a first sheet metal part 2 and a second sheet metal part 3 make a fold connection.

In the example shown, the connection is made via a Pittsburgh fold, as he the Fign. 2 and 3 in its principal Training can be found.

As the fig. 2 and 3 show, the first sheet metal part 2 is below Formation of a running in the longitudinal direction of the ventilation duct Bag folded in an S-shape. The second sheet metal part 3 is rectangular is folded and is initially used to produce the seam connection with its beveled edge in the through an S-bow of the first Sheet metal part 2 formed pocket inserted. To secure the positive connection obtained in this way is compared with the second sheet metal part 3 protruding sheet metal edge 4 of the first Sheet metal part 2 in the direction of an arrow 5 to the second sheet metal part 3 bent over and pressed against the latter. Which after all resulting seam connection is shown in Fig. 3.

To produce the fold connection in the manner described and The prior art discloses a seaming machine 1a, as outlined in Fig. 4.

This known folding closing machine 1a is with a pair of drive rollers 6a, 7a equipped, the opposite of each other Sides lie against the sheet metal edge 4 under pressure. Means driven by an electric motor move the drive rollers 6a, 7a the seaming machine 1a in the feed direction, i.e. in Longitudinal direction of the sheet edge 4. The drive rollers 6a, 7a in The direction of advance lagging on the seaming machine 1a Provided pair of form rollers, not shown, whose roller gap compared to the starting position of the Sheet metal edge 4 is inclined towards the second sheet metal part 3 and with this includes an acute angle. In the feed direction behind the pair of form rollers is in turn one on the pair of form rollers facing end face with an inclined sliding block 8a provided.

The seaming machine is used to make the seam connection 1a in the position shown in FIG. 4 on the sheet metal edge 4 of the first Sheet metal part 2 attached. The drive rollers 6a, 7a pull the Folding closing machine 1a in the feed direction on the sheet metal edge 4 along. The one emerging from the nip of the drive rollers 6a, 7a Part of the sheet edge 4 runs in the roller gap of the pair of form rollers and is thereby according to the inclination this roller gap bent towards the second sheet metal part 3. Finally, the sliding block 8a lagging the pair of form rollers presses the after leaving the roller gap of the pair of form rollers inclined at an acute angle against the second sheet metal part 3 extending sheet metal edge 4 on the surface of the second sheet metal part 3 in the position shown in Fig. 3.

Reactive forces are associated with the applied bending forces, as a result of which the seaming machine 1a strives to be to move toward the upper end of the sheet edge 4 in FIG. 4. This unwanted tearing of the seaming machine 1a from it provided movement path acts a support 9a with a Support roller 10a counter. The latter rolls during the feed movement the folding closing machine 1a with a tapered edge 11a on the first sheet metal part 2 and thereby engages with the edge 11a into a groove-like longitudinal recess created during folding of the first sheet metal part 2. The support roller 10a forms accordingly an abutment for the seaming machine 1a, by means of of which the seaming machine 1a is leaving its intended Trajectory is prevented.

The in Fig. 1 and in details in Figs. 5 to 7 shown Folding closing machine 1 according to the invention makes for the production of Fold connection Use of a first driven pair of form rollers 12, consisting of conical form rollers 13, 14, one second pair of form rollers 15 with also driven and conical trained form rollers 16, 17 and a pressure roller 18th

By means of the driven form rollers 13, 14; 16, 17 is the Folding closing machine 1 in the feed direction 19 along the longitudinal edge the sheet metal edge 4 moves. The form rollers 13 roll 14; 16, 17 of the first pair of form rollers 12 and of the second pair of form rollers 15 each on opposite sides from the sheet metal edge 4. According to the feed direction 19 of the Folding closing machine 1 runs the one in the vertical starting position Sheet edge 4 first in a roller gap 20 of the first A pair of form rollers 12. The roller gap 20 closes with the plane of the second sheet metal part 3 an acute angle 21. In a corresponding position with respect to the second sheet metal part 3 Sheet metal edge 4 from its vertical starting position by means of the form rollers 13, 14 bent. The resulting orientation of the Sheet edge 4 is shown in Fig. 5.

After leaving the roller gap 20, it runs at an angle 21 sheet edge 4 in inclined against the plane of the second sheet metal part 3 a roller gap 22 between the form rollers 16, 17 of the second Pair of form rollers 15 a. The roller gap 22 is stronger than that Level of the second sheet metal part 3 inclined than that of the sheet metal edge 4 previously passed nip 20. As indicated in Fig. 6 is, the nip 22 closes with the plane of the second Sheet metal part 3 an acute angle 23, which is approximately half as much is as large as the acute angle 21 between the central axis of the Roller gap 20 and the level of the second sheet metal part 3rd

After leaving the roller gap 22, it is then at an angle 23 sheet edge 4 inclined towards the plane of the second sheet metal part 3 acted upon by the pressure roller 18 and onto the surface of the second sheet metal part 3 pressed into its final bending position, in which the fold connection is closed.

Which in the described forming process due to the applied Bending forces resulting reaction forces, due to which the seaming machine 1 strives to have its plane of movement parallel to leave the plane of the second sheet metal part 3 and yourself to move towards the free longitudinal edge of the sheet metal edge 4 on the side of the sheet metal edge facing the second sheet metal part 3 4 initiated in this. A support is used for this purpose for the seaming machine with several abutments. As an abutment projections 25, 26 are provided on one with connected to the base body 24 of the folding closing machine 1 and on the second sheet metal part 3 resting guide plate 27. The projections 25, 26 form sliding shoes, which the sheet metal edge 4 at Movement of the folding machine 1 in the feed direction 19 on the reach behind the second sheet metal part 3. As an abutment the support for the folding machine 1 continues to serve the form roller 17 of the second pair of form rollers 15, the the roll edge at its flared end to almost the area of the kinking of the sheet metal edge 4 compared to the rest reaches the first sheet metal part 2 and the sheet metal edge 4 accordingly far below.

When bending the sheet metal edge 4 towards the second sheet metal part 3 occur on the sheet metal edge 4 restoring forces, as a result of which Sheet metal edge 4 is striving towards its starting position spring back. The initiation of these restoring forces in the first Sheet metal part 2 serve cylindrical support lugs 28, 29 on the Form rollers 13, 16. About these support lugs 28, 29 is an outward pivoting movement of the sheet metal edge 4 from the in FIGS. 5 to 7 positions shown towards its starting position prevented.

To adapt the seaming machine to changing sheet thicknesses are the form rollers 13, 14; 16, 17 of the form roller pairs 12, 15 as 7 indicated by an arrow 30 in the transverse direction of the Sheet metal edge 4 adjustable relative to each other. One in this Effective resilient bearing direction of a form roller each two form roller pairs 12, 15 is used for automatic adjustment the width of the roll nips 20, 22 with changing sheet thickness.

Claims (15)

1. Machine for bending over a sheet metal edge (4) which is provided on a first sheet metal portion (2) relative to a second sheet metal portion (3) which is to be connected to the first sheet metal portion (2), having at least one preferably driven pair (12, 15) of shaping rollers, whose shaping rollers (13, 14, 16, 17) roll in the direction of feed (19) at mutually opposing sides of the sheet metal edge (4) on the sheet metal edge (4) along the longitudinal edge thereof and whose roller clearance (20, 22) is inclined in the bending direction towards the second sheet metal portion (3), one of the shaping rollers (14, 17) engaging under the sheet metal edge (4) at the side thereof that faces the second sheet metal portion (3), and having a support which acts transversely to the direction of feed (19) and which has at least one abutment which is supported on one of the sheet metal portions (2, 3), characterised in that the abutment(s) is/are arranged to run behind the pair (12) of shaping rollers in the direction of feed (19) and is/are supported on the side of the sheet metal edge (4) that faces the second sheet metal portion (3).
2. Machine according to claim 1, characterised in that at least one sliding block, which is supported on the sheet metal edge (4), is provided as the abutment of the support.
3. Machine according to either of the preceding claims, characterised in that the sliding block(s) is/are supported on the sheet metal edge (4) by means of a sliding face.
4. Machine according to any one of the preceding claims, characterised in that at least one abutment roller, which rolls on the sheet metal edge (4) in the direction of feed (19), is provided as the abutment of the support.
5. Machine according to any one of the preceding claims, characterised in that there is provided as the abutment roller a roller (17) of a second pair (15) of shaping rollers which is arranged to run behind the first pair of shaping rollers (12) in the direction of feed (19) and whose shaping rollers (16, 17) roll in that direction on the sheet metal edge (4) at mutually opposing sides of the sheet metal edge (4), the roller clearance (22) of the second pair (15) of shaping rollers preferably being more acutely inclined in the bending direction towards the second sheet metal portion (3) than the roller clearance (20) of the first pair of shaping rollers (12).
6. Machine according to any one of the preceding claims having two pairs (12, 15) of shaping rollers, which are arranged behind each other in the direction of feed (19), characterised in that the abutment of the support comprises at least one sliding block which is arranged between the pairs (12, 15) of shaping rollers in the direction of feed (19) and/or at least one sliding block which is arranged to run behind the second pair (15) of shaping rollers.
7. Machine according to any one of the preceding claims, characterised in that the shaping rollers (13, 14) of the first pair (12) and/or the shaping rollers (16, 17) of the second pair (15) of shaping rollers are of conical shape.
8. Machine according to any one of the preceding claims, wherein the machine has a guide plate (27) which is positioned on the second sheet metal portion (3) and which is displaceable with the machine in the direction of feed (19), characterised in that at least one projection (25, 26), which extends from the guide plate (27) to the sheet metal edge (4), is provided as the abutment of the support.
9. Machine according to any one of the preceding claims, characterised in that at least one shaping roller (13, 16), which is arranged at the side of the sheet metal edge (4) that is remote from the abutment of the support, abuts the first sheet metal portion (2), which is provided with the sheet metal edge (4), at said side with a supporting projection (28, 29) outside the sheet metal edge (4).
10. Machine according to any one of the preceding claims, wherein at least one shaping roller (13, 16), which is arranged at the side of the sheet metal edge (4) that is remote from the abutment of the support, is of conical shape, characterised in that a supporting cylinder, which projects in the axial direction from the shaping roller(s) (13, 16) is provided as the supporting projection (28, 29) on the conical shaping roller(s) (13, 16).
11. Machine according to any one of the preceding claims, characterised in that at least one abutment of the support is adjustable perpendicularly to the sheet metal edge (4).
12. Machine according to any one of the preceding claims, characterised in that the shaping rollers (13, 14; 16, 17) of at least one pair (12, 15) of shaping rollers are adjustable relative to each other in the transverse direction of the sheet metal edge (4).
13. Machine according to any one of the preceding claims, characterised in that the shaping rollers (13, 14; 16, 17) are adjustable relative to each other by means of an adjustment device.
14. Machine according to any one of the preceding claims, characterised in that at least one shaping roller (13, 14; 16, 17) of at least one pair (12, 15) of shaping rollers is arranged resiliently in the transverse direction of the sheet metal edge (4).
15. Machine according to any one of the preceding claims having a pressing apparatus for pressing the sheet metal edge (4) of the first sheet metal portion (2) against the second sheet metal portion (3), characterised in that a cylindrical roller (18), which runs behind the shaping rollers (13, 14; 16, 17) and the abutment(s) of the support in the direction of feed (19), is provided as the pressing apparatus and the axis thereof extends parallel with the plane of the second sheet metal portion (3).

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