EP1382402A2 - Device for the manufacture of tubes from metal plates - Google Patents

Abstract

The device consists of a pipe shaping press with a bending element (4) attached to an upper part (3), an upper shaping tool (8) mounted on its foot (7) and lower press part (2) with a lower shaping tool (5). The upper shaping tool is mounted via a joint arrangement. The upper shaping tool can be mounted by attaching it to the foot of the bending element by a rotary joint (10).

Description

Device for producing pipes from metal sheets

The invention relates to a device for producing pipes from metal sheets after the progressive molding process in a tube forming press with a attached to the press upper part bending rate, at the foot of an upper mold is arranged, and a press base with a lower mold.

Known methods for producing tubes from sheet metal plates are the UOE - Process, the three-roll bending process, the spiral and the tube molding process. In tube molding, a distinction is made according to the progressive Folding process and the progressive molding process.

For the production of a pipe or large pipe according to the progressive molding process several successive steps are required.
The metal sheet is pre-bent at the longitudinal edges in a first step. The pre-bend is usually done in a separate edge press. The pre-bending of the longitudinal edges takes place so that the tube radius is uniformly formed during deformation to the slot tube in the region of the later seam, where the longitudinal edges of the bent to the tube sheet metal plate abut.
The pre-bent metal sheet is now subjected to the actual bending process in the tube forming press.
The tube forming press consists of a movable upper and lower part. Connected to the upper part of the tube forming press is a vertically arranged bending bar, at the foot of which the upper forming tool is fastened.

The lower mold consists in a simple embodiment of two strips, which are arranged at a variable distance from each other in the longitudinal direction. These two strips form the lower abutments for the metal sheet to be deformed.
The pre-bent on the longitudinal side panel is inserted in a further step in the tube forming press and then applied by depressing the press upper part a bending force on the metal sheet, which sets under the action of the bending load value and carried by this, upper mold deformation of the metal sheet. This procedure is repeated several times until the metal sheet has been formed into a slotted pipe.
The time to make a slit pipe thus depends on the number of strokes of the tube forming press, and this in turn on the area that is formed at a stroke. This forming area is determined by the width of the molding tool.
The mold attached to the base of the bending load value has a width which is a multiple of the transverse section of the bending load value and has a forming radius which depends on the inner radius of the pipe to be produced. This stamp-like, rounded molding tool sets asymmetrically on the metal sheet in the vertical movement, since this is preformed asymmetrically. This creates a bending moment in the bending rate. So that the bending rate does not buckle under such an asymmetric load, it is designed with a cross-section taking into account this bending moment.

The invention is therefore based on the object, a device of the above described type such that a larger area to be deformed Metal sheet can be bent without the load of the bending load value too increase.

This object is achieved in that the mold hinged at the foot of the bending load value, there preferably by swivel joints is attached.

With the invention hinged attachment of the molding tool at the foot of the bending load value can be achieved that when placing the mold on the metal sheet pivoting about the horizontal longitudinal axis is made possible.
When lowering or lowering of the bending rate in the direction of the lower mold with the laid metal sheet takes place with the foot attached to the upper mold a first contact between the radius of the mold and the metal sheet on the side of the bending value, which faces away from the pre-bent metal sheet side. Due to the articulated mounting in the horizontal longitudinal axis, the upper mold can roll on the surface of the metal sheet and thus spread over a larger deformation range until the metal sheet rests on eg the two strips of the lower mold. From this point on, the disassembly of the metal sheet begins over the radius of the upper mold.

A further embodiment provides that in addition the bending rate hinged is attached to the press upper part. By this measure the zweigelenkigen Execution is achieved that arise during bending no moments in the sword, apart from caused by the friction in the joints very small Torques.

The coefficient of friction of the relative movement between the upper mold and the Biegeschwert or the bending rate and the upper part of the press can by the choice of lubrication and the choice of the sliding pairings are affected.

Figur 1

eine Rohrformpresse - in einer Ausführung als C-Presse - in vereinfachter perspektivischer Darstellung;

Figur 2

eine Seitenansicht eines Biegeschwertes gemäß einer ersten Ausführungsform; und

Figur 3

eine Seitenansicht eines Biegeschwertes nach einer zweiten Ausführungsform.

An embodiment of the invention will be described in more detail with reference to very schematic drawings. Show it:

FIG. 1

a tube forming press - in a version as a C-press - in a simplified perspective view;

FIG. 2

a side view of a bending load value according to a first embodiment; and

FIG. 3

a side view of a bending load value according to a second embodiment.

In Fig. 1, a tube forming press 1 is shown, which consists of a press base 2 and a press upper part 3. On press upper part 3 of the molding press 1 a bending rate 4 is preferably releasably attached. By lifting and lowering of a drive, not shown, press upper part 3, a corresponding vertical movement of the bending rate 4 occurs.
On the press base 2 is a lower mold 5, here consisting of two moldings 6 and 6 ', arranged, while the bending load is provided with an upper mold 8. This is interchangeably fixed in the tube production according to the progressive shape - method at the foot 7 of the bending value 4. The upper mold 8 is provided on its underside 9 with a radius which is matched to the inner diameter of the tube to be formed.
The upper mold 8 is not rigidly attached to the foot 7 of the bending load value 4, but is - as shown in a first embodiment in Fig. 2 - movably mounted via a joint or a plurality of joints arranged in series 10, the deflection of the upper mold 8 to the longitudinal axis 11 in the direction of arrow 12 or 12 'allow. The pivot point 13 of the joint 10 is to avoid bending moments in the vicinity of the surface 14 of a metal sheet to be deformed to a pipe 15. The exact location depends on the criteria to be considered such as surface pressure, bearing size, etc. from. In the unloaded state, the upper mold 7 is brought by both sides of the bending value 4 attached lower spring elements 16 and 16 'in a vertically neutral position.

Another embodiment is shown in Fig. 3. The articulated attachment of the upper mold 7 is extended here by the bending rate 4 am Head end 17 connected by a further joint 18 with the press upper part 3 is, so a kind of double joint - arrangement with a pivoting movement present at the top and bottom of the bending rate. By both sides attached upper Spring elements 19 and 19 'is also in this attachment an alignment of the bending value 4 in a vertically neutral position in the unloaded state.

Reference numeral Overview

1

Pipe forming press

2

Press lower part

3

Press top

4

bending rail

5

lower mold

6 6 '

moldings

7

foot

8th

upper mold

9

bottom

10

swivel

11

longitudinal axis

12 12 '

Arrow deviating direction

13

axis of rotation

14

surface

15

metal sheet

16

lower spring elements

17

head

18

swivel

19 19 '

upper spring elements

Claims (5)

1. Apparatus for producing pipes from pre-bent metal sheets (15), consisting of a tube forming press (1) with a bending rod (4) fixed to the press upper part (3), at the foot (7) of which an upper mold (8) is arranged, and a lower press part (2) with a lower mold (5),
   characterized in that the upper mold (8) is articulated.
2. Device according to claim 1,
   characterized in that the upper mold (8) at the foot (7) of the bending load value (4) by means of swivel joints (10) is fixed.
3. Apparatus according to claim 1 or 2,
   characterized in that the bending rate (4) at its head end (17) by joints (18) on the press upper part (3) is mounted.
4. Device according to one of claims 1 to 3,
   characterized in that the axis of rotation (13) of the upper mold (8) adjacent to the surface (4) of the metal sheet (15) is provided.
5. Device according to one of claims 1 to 4,
   characterized in that the upper mold (8) and / or the bending bar (4) in the region of their joints (10,18) are subjected to force.

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