DE4225108A1 - Pipe bending press for hollow profiles with varying bending radii and cross=sections - has automatically exchangeable clamp jaws and bending tools in revolving magazines and has tool change device - Google Patents

Abstract

The press has a machine body (1), a clamping head (13) for the workpiece (11) to be bent, and a holder to support a bending core tool (16) in working position on the machine body. A pivot arm (18) carries a clamp jaw (7) via a clamp head (2) and acts with the core tool to bend the workpiece. One or more magazines (3) carry further clamp jaws and bending core tools. A tool change device moves the clamp jaws and the core tools between the magazines and the working position. The magazines are formed by revolving discs, located on a circular track. These cross the working positions of clamp jaws and tools. ADVANTAGE - Lower manufacturing costs combined with shorter production times for hollow profiles, is without multi-stage bending tools.

Description

The present invention relates to a pipe bending machine, such as they z. B. from the companies Lang, DLM, Petrazzoli. In such tube bending machines, the forming process on the hollow profile accomplished in that the hollow profile to be bent in one Clamping station is clamped, through which a mandrel holding rod reaches through, which in the profile of the hollow profile to be bent engages and that at the machine end in one Mandrel holding station is held. The profile to be bent is in the area a bending tool reshaped, opposite to Bending tool one or more clamping jaws and to the bending tool are arranged to be deliverable, with the one or more jaws Press the bent hollow profile against the bending tool. Then it turns the bending arm with its center of rotation in the bending tool is arranged and on which the jaws are arranged to a certain bending angle of z. B. 90 ° to maximum (usually 180 °), whereby the hollow profile is shaped by this pivoting process the bending tool and receives the desired shape.

The task of the mandrel, which is connected to the mandrel rod and the engages in the profile of the hollow profile to be bent, the Stabilize bending point and a deformation of the bend  Avoid hollow profile. So it's a classic one Pipe bending machine.

In such tube bending machines there is the disadvantage that if one in the case of a hollow profile, a series of wants to apply different bending radii, here a considerable one Effort arises.

It is known to use a "multi-groove bending tool" which practically consists of a multiple bending tool, being in one and the same bending tool vertically one above the other in mutual Spacing a number of bending tools with even though mutually different bending radii are arranged.

The operation of such a pipe bending machine is now such that a first section of the hollow profile to be bent z. B. on the bottom Floor, d. H. that is, the lowest bending tool, then what the entire tool-side clamping must be opened, and the Clamping station for holding the hollow profile to be bent as well as the The mandrel holding station is then raised a certain, vertical dimension driven, causing the pipe to be bent to engage the vertical The next tool on the bending mold above the lowest level is coming. The clamping jaws are also designed with multiple grooves, So consist of several, arranged vertically one above the other and fixed stationed clamping tools.

When bending the pipe on the next floor of the bending tool and it is the next floor of the assigned clamping tool required, the clamping station and the mandrel holding station additionally still move in the horizontal plane to the new bend radius to be able to manufacture.  

The disadvantage of the known multi-stage pipe bending machine is that Necessity to move the clamping station and the mandrel holding station at least in two mutually perpendicular planes and others The disadvantage is that the bending tool and the clamping tool, which there are several individual tools lying vertically one above the other, are relatively expensive to manufacture.

Viewed in the longitudinal direction of the pipe to be bent, it was otherwise known, before the jaws and before the bending tool still so-called "Guide rails" to arrange the pipe from at least two sides clamped here to prevent an inadmissible kinking and breaking out of the Avoid tube before entering the bending tool.

Also such guide rails, which like hydraulic jaws can be delivered to each other, must then at the known multi-stage mandrel bending machine adjusted in the vertical direction be synchronized with this adjustment of the adjustment of the Clamping station and the mandrel holding station to follow.

It is also known, with these guide rails, which - as I said - can also be designed as hydraulic jaws, one additional thrust on the clamped pipe towards the Exercise bending tool to undue thinning of the Avoid bending cross-section at the bending point.

It is therefore when using an additional pushing motion required that these guide rails are not in the prior art are only vertically movable but also in the longitudinal direction of the can be moved to the bent pipe.

It is obvious that the well-known pipe bending machine with multi-stage bending tools and clamping jaws high manufacturing costs and have high maintenance and repair needs, and beyond  because of the need to move the mandrel holding station and the Clamping station for the hollow profile and possibly also the Guide rails in production output is insufficient.

The invention has for its object a pipe bending machine type mentioned in such a way that at lower Manufacturing costs a reduced production time for bending Hollow profiles can be achieved.

To achieve the object, the invention is by characterized technical features of claim 1.

A feature of the present invention is that it now has multiple stages trained bending tools and associated clamping jaws is dispensed with and that also on a vertical travel of the clamping station for the hollow profile to be bent, as well as the vertical travel of the Mandrel holding station is dispensed with.

It is essential here that the bending tools and the clamping jaws are designed to be interchangeable and in the form of tool magazines are storable and automatically to the attachment point of either Bending tool or the jaw can be fed and removed.

This is the first time with the technical teaching of the invention Advantage achieved that the aforementioned need for vertical The clamping station and the mandrel holding station cannot be moved, as well as the need to move the previously mentioned Guide rails, because in the present invention always in one and the same level is used, while in the prior art in was bent several vertically one above the other.

This has the advantage of being more cost-effective to produce  Machine, a faster production process and less expensive Bending tools and clamping jaws because these parts are no longer must be multi-level, but there will be a number of Individual tools as interchangeable tools in one or each several assigned magazines or cassettes saved and up to date to the required bending task then to the clamping location of the Bending tool and the clamping jaw fed and automatically clamped, and after completion of the one bending radius on the hollow profile again removed and replaced by another bending tool or clamping jaw.

The advantage of the present invention is that now none high-build, multi-stage bending tool and an assigned, Multi-stage jaw must be used once in the Manufacture are very expensive, which may result in damage must be removed completely, replaced with new tools and only a limited number of bending shapes on the to accommodate available space.

In the prior art, there are therefore only a maximum of three or four overlying bending tools and associated clamping jaws possible due to the height limitation, while at Invention any number of different Single bending tools and single clamping jaws in assigned magazines can be saved and automatically fed in and out.

Limitation of the prior art to a maximum of three or four vertically superimposed bending tools and associated With complex bending tasks, clamping jaws resulted in the fact that several, multi-stage bending tools and jaws would have to provide in the case of a hollow profile which is complicated to bend, one after the other to be able to exchange multi-stage tools. That was with the downside connected that when bending a relatively complicated hollow profile  this hollow profile only z. B. only be bent up to a half could, after which the replacement of the multi-stage bending tools and Clamping jaws would have to take place and then the hollow profile would only be bent to the end could be.

These disadvantages in the production process are eliminated according to the present Invention.

According to a further advantage of the invention, it is now possible for the first time conventional pipe bending machines, the z. B. not necessarily a have multi-stage bending tool and multi-stage jaws, but also single-stage bending tools and simple clamping jaws on one to upgrade multi-stage pipe bending machine according to the invention.

That is, according to the invention, the existing ones Bending tools - which do not necessarily have to be multi-stage - and the simple existing jaws that are not necessarily must be multi-level, interchangeable. It will be one Tool changing device created that allows the existing Bending tools and jaws can be exchanged and easily by other tools held in a magazine or storage replace.

This allows you to upgrade relatively simple pipe bending machines CNC controlled machines with which it is possible to use different Bending radii and cross sections to bend in a confined space, thereby more qualified bending products can be manufactured.

When realizing interchangeable bending tools and jaws, that are kept in different magazines, there are several Embodiments, all of the inventive concept of present invention.  

In a first embodiment it is provided that the magazine as Revolver disc is formed and on such Turret disk, the z. B. is rotatable in a horizontal axis and in a vertical axis, several bending tools are arranged, which can be automatically fed and removed and which - as required - be coupled with the pipe bending machine.

In another embodiment, it is provided for the Turret disk to use a vertical axis of rotation, the disk itself lies in a horizontal plane, and also on the circumference distributes a different number of different bending tools are coupled and uncoupled arranged on this disc.

The same arrangement of turret discs can also on the part of Clamping jaws are made, which are also interchangeable different circumferential locations of the respective turret disk and can also be coupled and uncoupled with this turret disk are connected.

Instead of the formation of vertical or horizontal turret discs with correspondingly detachable tools, it is also possible to use so-called "lifting magazines", in several, vertically different superposed cassette-like departments Bending tools are available, which then depend on the bending task can be taken from the respective subject and to the clamping location at the Machine. Such vertical lifting magazines are both possible on the side of the clamping jaws as well as on the side of the Bending tool.

Instead of such vertical lifting magazines it is of course also possible to arrange these lifting magazines horizontally movable.  

The bending tools (core bending tools) can be inserted or can be swiveled in to make it easy to replace To enable pipe bending machine.

This configuration ensures that the bending arm is still can make a maximum bending angle of 180 °. So that remains Get the entire work area of a known pipe bending machine without that here restrictions in the bending angle due to the invention existing machine tool must be accepted.

The subject matter of the present invention does not arise only from the subject of the individual claims, but also from the combination of the individual claims.

All in the documentation - including the summary - Disclosed information and features, especially those in the drawings Spatial training shown are essential to the invention claimed, insofar as they are individually or in combination with the stand of technology are new.

In the following the invention is based on only one Execution path illustrating drawings explained in more detail. Go here from the drawings and their description further essential to the invention Features and advantages of the invention.

Show it:

Fig. 1 front view of a pipe bending machine according to the invention;

Fig. 2 is a plan view of the machine of FIG. 1.

In Figs. 1 and 2, on a machine body 1 are respectively rotatably and pivotally in each case a magazine 3, 21 are arranged. To bend a workpiece 11 , for. B. a hollow profile, this is clamped in a clamping head 13 in a manner known per se, which can optionally be adjustable in the arrow directions 14 , 15 .

The workpiece 11 lies with its front end in the profile cross section of a bending core tool 16 and is supported from the opposite side by a clamping jaw 7 which is fed to the workpiece 11 by a clamping head 2 .

In this case, a mandrel 12 can be arranged in the interior of the workpiece 11 in order to support the bending zone in the workpiece in the region of the bending core tool 16 . It is now important that with the proposed expansion of the machine, the most varied of bending radii and shapes can now be attached to the tool 11 to be formed in a very rapid manner.

For this purpose, a first magazine 3 is provided, which is arranged in a rotary bearing 10 in a rotationally driven manner at the front free end of a pivot arm 4 , which in turn is arranged pivotably in the arrow directions 6 in the pivot bearing 5 on the machine body 1 .

On the magazine 3 , a number of jaws 7 , 7 a are arranged, it is important that if you want to make five different bends on a workpiece, you need five different jaws 7 , 7 a if these bends are very close together lie.

It is now important that on the magazine 3 more than five jaws 7 , 7 a place, z. B. ten different jaws, so that it is possible to bend workpieces 11 in a spatial manner for installation in a motor vehicle, such a workpiece being designed as a longitudinal axis for the left and right side of the vehicle exactly mirror image. Depending on the rotation of the magazine, the five clamping jaws for making the five bends for the left side member and then the five clamping jaws for bending the right side member can be engaged very quickly in succession. In a series production, of course, a large number of left side members are produced until the program for driving the magazine is switched to bring the other clamping heads into engagement with the workpiece, these clamping heads being arranged on the magazine in a mirror-image sequence and accordingly be brought into engagement with the workpiece to be bent.

The placement of the clamping jaws 7 , 7 a takes place in that a lifting device 8 is arranged on the magazine 3 , which, in the case of replacement, is moved exactly above the clamping jaw 7 that is currently engaged. For this purpose, the clamping head 2 is then retracted, as a result of which the clamping jaw 7 'is disengaged from the workpiece 11 . The lifting device 8 now conveys the jaws 7 'in an empty magazine, which is then advanced by a certain step to convey a new jaw 7 down in front of the chuck 2 . The clamping head 2 is then moved forward again with the piston-cylinder arrangement 10 driving it, so that the new clamping jaw 7 lies against the workpiece 11 .

In the meantime, the workpiece 11 has been moved forward by a certain step by driving the clamping head 13 in the direction of the arrow 15 .

This assumes that the same bending core tool 16 is still in use.

According to the invention, it is now provided that in addition to the one bending core tool 16 , a number of further bending core tools can now be brought into engagement, in which such bending core tools 16 , 16 a are in turn arranged on another magazine 21 . In an analogous manner, this magazine 21 is rotatably driven and arranged at the front free end of a swivel arm 20 , which in turn is pivotably driven in a swivel bearing 5 on the machine body 1 .

A lifting device 8 is again provided, which is driven in the arrow directions 9 in order to disengage the bending core tool 16 from the workpiece 11 in an analogous manner and to replace it with a new bending core tool.

The actual bending of the workpiece now takes place in that the workpiece is advanced by a certain amount via the bending core tool 16 , with the clamping head 2 pressing the clamping jaws 7 against the workpiece 11 in a form-fitting manner. The swivel arm 18 with its associated rotary drive 19 is then pivoted in the direction of arrow 23 , as a result of which the workpiece 11 is bent around the bending core tool 16 , a mandrel 12 in the interior of the workpiece 11 supporting the bending zone.

After the bend has been made, the bending core tool 16 can be replaced, but does not have to be replaced. This is only necessary if different bending radii are required.

However, if a three-dimensionally bent workpiece 11 is to be produced with the same bending radii, then it is generally sufficient to use only different clamping jaws 7 , 7 a with one and the same bending core tool. The. Magazine 21 will then only take action (rotation in the direction of arrow 22 ) if mirror-image workpieces 11 are to be bent, or if different bending radii are desired, or if different profiles are to be bent. So you can bend 21 different bending radii with a fully loaded magazine, different profiles and left / right profiles.

The clamping jaws 7 from the magazine 3 are then used accordingly.

Drawing legend

1 machine body
2 clamping head
3 magazine
4 swivel arm
5 swivel bearings
6 arrow directions
7 , 7 a, 7 ′ jaws
8 lifting device
9 arrow direction
10 swivel bearings
11 workpiece
12 thorn
13 clamping head
14 arrow direction
15 direction of arrow
16 , 16 a bending core tool
17 Piston-cylinder arrangement
18 swivel arm
19 rotary drive (for 18 )
20 swivel arm
21 magazine
22 arrow direction
23 direction of arrow

Claims (11)

1. Pipe bending machine for bending hollow profiles with different bending radii and cross sections, characterized in that the following are provided:

• - a machine body ( 1 ),
• a clamping head ( 13 ) which clamps the workpiece ( 11 ) to be bent,
• a holder which carries a bending core tool ( 16 ) in the working position on the machine body ( 1 ),
• - A swivel arm ( 18 ) which via a clamping head ( 2 ) carries a clamping jaw ( 7 , 7 a, 7 ') which cooperates with the bending core tool ( 16 ) to bend the workpiece ( 11 ) in the working position,
• - One or more magazines ( 3 , 21 ), the additional jaws ( 7 , 7 a, 7 ') and bending core tools ( 16 ) buffer, and
• - A tool changing device ( 8 ), the jaws ( 7 , 7 a, 7 ') and the bending core tools ( 16 ) between the working position and the magazines ( 3 , 21 ) exchanged.

2. Pipe bending machine according to claim 1, characterized in that the magazines ( 3 , 21 ) are turret disks which are arranged on a circular path, the clamping jaws ( 7 , 7 a, 7 ') and the bending core tools ( 16 ). 3. Pipe bending machine according to claim 2, characterized in that the circular paths cross the working position of the clamping jaws ( 7 , 7 a, 7 ') and the bending core tools ( 16 ). 4. Pipe bending machine according to claims 2 and 3, characterized in that the turret disks are connected to the machine body ( 1 ) via swivel arms ( 4 , 20 ), which are carried by swivel bearings ( 5 ) on the machine body ( 1 ). 5. Pipe bending machine according to claims 2 to 4, characterized characterized in that the turret discs in one common level. 6. Pipe bending machine according to claims 4 and 5, characterized in that the pivot bearings ( 5 ) which support the pivot arms ( 4 , 20 ) with the turret discs are perpendicular to the plane which forms the machine body ( 1 ), and that the turret discs extend parallel at a distance from the plane of the machine body ( 1 ). 7. Pipe bending machine according to claim 6, characterized in that the clamping jaws ( 7 , 7 a, 7 ') and the bending core tools ( 16 ) perpendicular to the plane of the machine body ( 1 ) from the temporarily stored position into the working position by means of the tool changing device ( 8 ) and are reversible. 8. Pipe bending machine according to claim 7, characterized in that the holders for the bending core tool ( 16 ) and the clamping tool ( 7 , 7 a, 7 ') are arranged in the working position and the clamping head ( 2 ) between the machine body ( 1 ) and the turret disks are. 9. Pipe bending machine according to claims 2 to 8, characterized in that the one turret disk, the bending core tools ( 16 ) and the other turret disk carries the clamping jaws ( 7 , 7 a, 7 '). 10. Pipe bending machine according to claims 6 to 9, characterized in that the workpiece ( 11 ) is fed parallel to the plane of the machine body ( 1 ). 11. Pipe bending machine according to claims 1 to 10, characterized in that a mandrel ( 12 ) can be inserted into the workpiece ( 11 ) in the region of the working position.