EP2163323A2 - Pipe bending machine - Google Patents

Abstract

The machine has a base plate (3) and a tool carrier (1) comprising two bending tools and two holders for the bending tools. The bending tools and/or two holders are arranged on the tool carrier such that the bending tools in operating positions are found in the swiveling positions, respectively. The tool carrier swivels around a swiveling axis (A), which lies in a level that stands in an angle larger than zero degree and less than 180 degree to a pipe axis of a linear pipe (30). The swiveling axis runs via the tool carrier.

Description

The invention relates to a pipe bending machine.

Tube bending machines are known for various tube bending methods. In so-called press bending, the bending tool with the incorporated bending radius is pressed manually or hydraulically against two counter rollers. This movement forces the tube inserted between the bending radius and the counter roll to bend around the radius. Since the pipes can not be supported from the inside, this method is usually suitable only for thick-walled pipes and large bending radii. Three-roll bending is used to make workpieces with large bending radii. The process is similar to press bending, but the work roll and the two stationary counter rolls rotate and thereby form the bow. During compression bending, the tube is clamped between a sliding carriage and a stationary bending roller. By rotating the slide around the bending roller, the tube is bent to the radius of the bending roller. Much more versatile and precise than the aforementioned methods is the Rotationszugbiegen. The workpiece is in this case fixed between the bending roller and the clamping piece and formed by rotation of both tools around the bending axis.

For pipe bending, it is increasingly important to develop tube bending machines that allow to bend each other following pipe sections of the pipe to be deformed in different ways. For example, it may be provided that a first pipe section with a first bending radius and a first rotation angle is to be bent, while a subsequent pipe section with a second bending radius is to be bent by a second rotation angle. Further Pipe bending orders are known in which a first pipe section "to the right" and the subsequent pipe section "to the left" to be bent.

Out DE 102 49 316 A1 a pipe bending machine is known in which an annular deformation tool is mounted adjustable by at least three waves with respect to a base body. The pipe to be bent is held in a guide member upstream of the deformation tool. By adjusting the relative position of the deformation tool relative to the guide part, it can be made possible that the tube can be deformed almost freely.

Against this background, the present invention seeks to propose a pipe bending machine, which allows simple means to allow the freeest possible bending of the tube.

This object is solved by the subject matter of claim 1. Advantageous embodiments are given in the subclaims.

The invention is based on the basic idea to provide the pipe bending machine with a pivotable tool carrier having at least two bending tools or at least at least two receptacles for bending tools. According to the invention, it is provided that the at least two bending tools or the at least two receptacles are arranged on the tool carrier in such a way that a first bending tool is in a working position in the first pivoting position and that a second bending tool is in the working position in the second pivoting position , The arrangement of the bending tools on a pivotable tool carrier allows a rapid change between two bending tools, so that the time required to bend two pipe sections of different bending geometry tool change can be performed quickly and easily. In the pipe bending machine according to the invention, it is provided that the tool carrier pivots about a pivot axis which lies in a plane which is at an angle greater than 0 ° and less than 180 ° to the pipe axis of the unbent pipe. Such an arrangement of a tool carrier simplifies the construction of the tube bending machine and allows a rapid change between two bending tools.

The basic body of a tube bending machine is understood to be any body on which a pivotable tool carrier can be fastened, even with the interposition of further movement means. Especially Favor is understood as the body of the part or a part of the part of the bending machine, which is not moved.

As a tool carrier is also understood a multi-part assembly, which is pivoted as a whole. For example, a tool carrier can be formed by a plurality of frame-like components. Depending on the design of the bending tool, the respective bending tool can be attached to a single component of the tool carrier or be formed by sub-tools, which are connected to different components of the tool carrier. When Rotationszugbiegen a bending tool is formed for example by a bending roller and a clamping piece and sometimes by other sub-tools, such as a Faltenglätter or a slide rail. According to a preferred embodiment, the tool carrier is formed by a rectangular frame construction, in the middle of which eyes for receiving a shaft are provided. Furthermore, a pivotable with the shaft arm can be provided. In such a tool carrier, the one tool of the bending tool, namely, for example, the bending roller, are supported by the shaft, while another part tool of the bending tool, for example, the clamping piece is connected to the pivot arm. The inventively provided second bending tool can then be provided on the same or other components of the tool carrier.

The tool carrier according to the invention is pivotable about a pivot axis which lies in a plane which is at an angle greater than 0 ° and less than 180 ° to the tube axis of the bent tube. In general, the pipe section of the pipe to be bent, which is to be bent, runs straight before bending. This is often necessary because this is to be bent pipe section (at least partially) by a usually rectilinear clamping piece (during Rotationszugbiegen) or against a mostly rectilinear counter bearing (press bending) is supported. As "tube axis of the unbent tube" is therefore understood in such embodiments in which at least the pipe section to be bent is rectilinear course of the tube axis, as it results when the pipe section to be bent has been introduced into the position, then in the next step the actual tube bending takes place with the bending tool. This is the Rotationszugbiegen example, the clamping of the pipe section to be bent between the clamping piece and the bending roller before the pivoting of the bending roller has begun. Although in a plurality of tube bending machines, the tube bending is carried out starting from a straight tube which is bent in sections. Thus, a first portion is often bent at the first end of the rectilinear pipe, then the pipe advanced so far, until the next pipe section to be bent can be detected by the bending tool to then bend it. So you work the entire straight pipe until you arrive at the other end of the straight pipe. However, the invention should not be limited to tube bending machines for such methods. Thus, it happens that the pipe bend to be performed by the pipe bending machine on a pipe already bent in some pipe sections should take place and the newly bent pipe section between already bent pipe sections. Although this requires a complicated support of the tube in the inlet to the tube bending tool. Since the inventive concept is also applicable to such tube bending machines, according to a preferred embodiment, the term "tube axis of the unbent tube" and thus the reference axis for the definition of the position of the plane in which the pivot axis of the tool carrier is located, understood that it It is about the tube axis of the pipe section to be bent, as it is when the pipe section to be bent has been introduced into the position in which then the actual tube bending takes place with the bending tool as the next step.

The position of the pivot axis of the tool carrier in a plane which is at an angle greater than 0 ° and less than 180 ° to the tube axis of the unbent tube, in particular allows the advantage of a compact construction of the pipe bending machine. Furthermore, in some preferred embodiments of the pipe bending machine according to the invention, connections or drives which are to be connected to the tool carrier can be brought closer to the tool carrier.

The achievements of the invention are achieved in particular by the orientation of the pivot axis of the tool carrier. Since a pipe bending machine without a bending tools attached to it is a viable good, for example, for customers who have change tools, reproduced in this description explanations of the construction of the pipe bending machine according to the invention or preferred embodiments of the pipe bending machine according to the invention - unless it is specific descriptions The bending tools themselves act - also on the recording (can also be composed of individual shots) for a bending tool.

In a particularly preferred embodiment, the pivot axis about which the tool carrier pivots, in a plane which is at an angle of 90 ° to the tube axis of the unbent tube. By this configuration, the pipe bending machine is designed to be particularly compact. Particularly preferably, the pivot axis is aligned horizontally.

There are embodiments of the pipe bending machine conceivable in which the tool carrier, for example, guided on a curved rail, is pivoted about a pivot axis which does not extend through the tool carrier. In a preferred embodiment, however, the pivot axis extends through the tool carrier. This makes it possible to achieve a particularly compact construction of the tube bending machine.

The advantages of the tube bending machine according to the invention can be achieved in tube bending machines which work after press bending or three-roll bending or compression bending or rotary draw bending. Particularly preferred is a tube bending machine, wherein at least one of the at least two bending tools is designed for the Rotationszugbiegen. Particularly preferably, the tube bending machine has a bending roller and a clamping piece, which are arranged on the tool carrier. The second bending tool of the inventively provided at least two bending tools on the tool carrier can be designed to perform a different bending process. However, the second bending tool for performing the Rotationszugbiegens is particularly preferably formed. In a preferred embodiment, therefore, the tube bending machine has a first bending roller and a first clamping piece as well as a second bending roller and a second clamping piece, which are arranged on the tool carrier. But it is also conceivable that the second bending tool is designed in the manner of a deformation tool, as it DE 102 49 316 A1 is known.

In a preferred embodiment, the tube bending machine further comprises a slide rail and / or a fold smoother, which are also arranged on the tool carrier. By using a slide rail and / or a Faltenglätters bending tasks can be performed after the Rotationszugbiegen easier.

In a preferred embodiment, the axis of rotation of a bending roller extends on the tool carrier at an angle of greater than 0 ° and less than 180 °, particularly preferably at an angle of 90 ° to the pivot axis of the tool carrier. This arrangement makes it possible to form the tube bending machine compact and at the same time robust.

In a preferred embodiment, the pivot angle by which the tool carrier is pivoted in order to move from the first pivot position into the second pivot position is greater than or equal to 90 ° and is particularly preferably 180 °. A larger swivel angle between the working positions simplifies the design measures for the arrangement of the bending tool on the tool carrier, since with increasing swivel angle less measures must be taken to ensure that a moving part tool of the bending tool or a moving part of the tool carrier or parts of the pipe to be bent not collide with parts of the second, not used bending tool. Therefore, in particular a pivot angle of 180 ° is preferred. On the other hand, with a larger swivel angle, the time required for the pivoting of the tool carrier in the course of operation increases from one working position to the other working position. Depending on the requirement, it may therefore be advantageous to also provide a smaller swivel angle.

In a preferred embodiment, the tube bending machine according to the invention comprises a first bending roller and a first clamping piece and a second bending roller and a second clamping piece, which are arranged on the tool carrier, that the first bending roller and the first clamping piece in the first pivot position in its working position and the second bending roller and the second clamping piece are in the second pivoting position in their working position. With such a construction of a pipe bending machine, a Rotationszugbiegen can be performed in both working positions.

In a preferred embodiment, the first and second bending rollers on the same axis of rotation. This allows to support both bending rollers on the same shaft. As a result, the drive necessary for bending can be simplified, since the same drive can be used for both bending tasks in the two working positions.

In a preferred embodiment, the first clamping piece is supported on a first pivot arm and the second clamping piece on a second pivot arm. Both the first pivot arm and the second pivot arm may be designed to be pivotable about the same axis of rotation and in particular preferably be carried by the same shaft.

In a preferred embodiment, the tool carrier is connected to the base body in such a way that it can be moved linearly in at least one direction relative to the base body. It is advantageous not only to make the tool carrier pivotable, but also to permit a linear adjustment of the position of the bending tools relative to the base body by means of a linear movement relative to the basic body. In a particularly preferred embodiment, the tool carrier is connected via a cross slide with the main body.

Fig.1

den Werkzeugträger und einen Teil des Grundkörpers einer erfindungsgemäßen Rohrbiegemaschine in einer schematischen, perspektivischen Ansicht;

Fig.2

den Werkzeugträger und den Teil des Grundkörpers gemäß Fig. 1 in einer schematischen Seitenansicht und

Fig. 3

den Werkzeugträger und den Teil des Grundkörpers gemäß Fig. 1 in einer schematischen Frontansicht.

The invention will be explained in more detail with reference to a drawing illustrating only embodiments. Show:

Fig.1

the tool carrier and a part of the main body of a pipe bending machine according to the invention in a schematic, perspective view;

Fig.2

the tool carrier and the part of the body according to Fig. 1 in a schematic side view and

Fig. 3

the tool carrier and the part of the body according to Fig. 1 in a schematic front view.

In Fig. 1 a tool carrier 1 of a pipe bending machine according to the invention is shown. The tool carrier 1 is connected via a cross slide 2 with a basic body 3 shown only schematically and partially.

The tool carrier 1 is connected by carriers 10, 11 with the cross slide 2. The carriers 10, 11 each have a bearing 12, in which a pivot pin of a frame-like constructed component group 13 of the tool carrier 1 is mounted.

The frame-like constructed component group 13 of the tool carrier 1 consists of two longitudinal elements 14, two transverse elements 15 and two cover elements sixteenth

On the shaft 18 sits a first bending roller 20 and a first pivot arm 22. On the shaft 19 is seated a second bending roller 21 and a second pivot arm 23rd

The cover elements 16 carry openings 17. The openings 17 are penetrated by the shafts 18, 19.

The tool carrier 1 has a first bending tool for rotational tensile bending. This bending tool is formed by the first bending roller 20, a clamping piece 24 arranged on the first pivoting arm 22, a slide rail 25 and a fold smoother 26. A second bending tool is formed by the bending roller 21, a arranged on the second pivot arm 23, not shown in detail clamping piece, the slide rail 27 and the Faltenglätter 28.

The tool carrier 1 is pivotally mounted on the pivot pin in the carriers 10, 11 and pivots about the pivot axis A. In the in the Fig. 1 . 2 . 3 shown operating situation, the tool carrier 1 is in a first working position, in which the bending takes place by means of the first bending tool. By pivoting the tool carrier about the pivot axis A by 180 °, the second bending tool (bending roller 21, clamping piece, slide rail 27, Faltenglätter 28) in a working position (second pivot position of the tool carrier 1) are brought.

In the in Fig. 1 shown operating situation, the rectilinear pipe 30 is clamped with its pipe section 31 to be bent between the clamping piece 24 and the bending roller 20. The pipe section 31 to be bent is still unbent. As soon as the bending roller 20 and the clamping piece 24 is pivoted about the axis of rotation B extending along the shaft 18, the pipe section 31 is bent according to the Rotationszugbiegeverfahren. Of the Fig. 1 is removable, that the pivot axis A of Tool carrier 1 is in a plane which is at an angle of 90 ° to the tube axis of the unbent tube (here: the unbent tube section 31).

The axis of rotation B of the bending roller 20 and the axis of rotation C of the bending roller 21 extend at an angle of 90 ° to the pivot axis A of the tool carrier.

In the figures not shown are drive means for pivoting the tool carrier 1 about the pivot axis A and drive means to pivot the pivot arm 22 about the rotation axis B and the pivot arm 23 about the rotation axis C and drive means to the clamping pieces of the bending tools in a to move the pipe section to be bent against the respective bending roller clamping position.

The cross slide 2 allows the carrier 10, 11 and thus the tool carrier 1 to move linearly relative to the base body 3, in the direction of the double arrow D and in the direction of the double arrow E.

Claims (10)

Pipe bending machine with a base body (3) and a relative to the base body (3) between a first pivot position and a second pivot position pivotable tool carrier (1), wherein the tool carrier (1) has at least two bending tools or at least two receptacles for bending tools, wherein the at least two bending tools, or at least two receptacles on the tool carrier (1) are arranged such that in the first pivot position, a first bending tool is in a working position and that in the second pivot position, a second bending tool is in a working position, characterized in that the tool carrier (1) pivots about a pivot axis (A) which lies in a plane which is at an angle of greater than 0 ° and less than 180 ° to the tube axis of the unbent tube (30). Pipe bending machine according to claim 1, characterized in that the tool carrier (1) pivots about a pivot axis (A) which lies in a plane which is at an angle of 90 ° to the pipe axis of the unbent pipe (30). Pipe bending machine according to claim 1 or 2, characterized in that the pivot axis (A) through the tool carrier (1). Pipe bending machine according to one of the preceding claims, characterized by a bending roller (20, 21) and a clamping piece (24), which are arranged on the tool carrier (1). Pipe bending machine according to claim 4, characterized in that the axis of rotation of the bending roller (20, 21) at an angle greater than 0 ° and less than 180 °, in particular at an angle of 90 ° to the pivot axis (A) of the tool carrier (1). Pipe bending machine according to one of the preceding claims, characterized in that the pivot angle by which the tool carrier (1) is pivoted to move from the first pivot position to the second pivot position is greater than or equal to 90 ° and in particular 180 °. Pipe bending machine according to one of claims 1 to 6, characterized in that a first bending roller (20) and a first clamping piece (24) and a second bending roller (21) and a second clamping piece in such a way on the tool carrier (1) are arranged such that the first bending roller (20) and the first Clamp (24) are in the first pivot position in its working position and the second bending roller (21) and the second clamping piece are in the second pivot position in its working position. Pipe bending machine according to claim 7, characterized in that the first and the second bending roller have the same axis of rotation. Pipe bending machine according to one of claims 1 to 8, characterized in that the tool carrier (1) is connected to the base body (3) in such a way that it can be moved linearly in at least one direction relative to the base body (3). Pipe bending machine according to claim 9, characterized in that the tool carrier (1) via a cross slide (2) with the main body (3) is connected.

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