DE102013100944A1 - Method for manufacturing shaping shoulder, involves forming groove with variable groove width and variable groove depth in surface of shoulder portion along three-dimensional shaping edge of form shoulder - Google Patents

Abstract

The method involves producing a shoulder portion with predesignated three-dimensional shape. The shoulder portion is prefabricated as flat metal sheet. The shoulder portion edge supports three-dimensional shaping edge (5) of a form shoulder. A groove (6) with variable groove widths (L1, L2) and variable groove depth is formed in the surface of the shoulder portion along the three-dimensional shaping edge of the form shoulder. An independent claim is also included for a form shoulder.

Description

The invention relates to a forming shoulder and a method for its production.

Out DE 203 20 160 U1 a forming shoulder is known for forming a film web into a tube having an outer shoulder surface over which the film web is guided to and through a conduit bounded by a deflecting edge into a tube, at least a portion of the deflecting edge being displaced by a distance entire form shoulder small insert is formed, whereby after normal wear of the deflection not the entire spatial form body, but only the insert must be replaced.

For the production of forming shoulders, as used for example in the manufacture of tubular bags, various methods are known. Such forming shoulders usually comprise a shoulder part and a prism part, which are connected to one another along a forming edge. One way to make such forming shoulders is to make each forming shoulder individually by hand by first making the required parts and then assembling. After assembly of the individual parts, the dimensional accuracy of the form shoulder and its behavior are tested in use and generally carried out in several steps a fine machining to eliminate deviations from the nominal dimensions and to achieve a wrinkle-free deformation. This procedure is very laborious and time consuming and good results are difficult to reproduce.

Newer manufacturing methods are based on modern calculation methods for determining the required forming surface of the shoulder part and the prism part and the shape of the forming edge, computer-aided design and precise production of the forming shoulder as a whole or the required individual parts and subsequent assembly of the forming shoulder from the individual parts. The production of the forming shoulder as a whole can be done for example by milling. As a result, the previously theoretically determined model can be realized very accurately, but this process is very complex in terms of material and technology. It is therefore used only for relatively small form shoulders (up to a tubular bag width of 50 mm).

More often, a method is used in which the theoretically determined items are machined and then assembled manually. For example, in a formed from sheet metal blanks shoulder first the flat unwinding of the items of shoulder and prism part and optionally a flange and support elements by laser cutting or milling are tailored precisely. Prism part and shoulder part are then largely rounded manually and manually positioned to each other and fixed by welding or soldering. The rounding accuracy of the prismatic part can be quite accurately produced and measured by rounding machines.

Prism parts for round tube cross sections are also made of tube material in practice, whereby the forming edge is milled very precisely on a CNC milling machine. However, this process is expensive. First, the tubes must be kept in stock for a variety of cylinder diameters, with only one very short piece per format required. Machining during the production of the forming edge and, if necessary, when removing the pipe is expensive machine work.

In order to produce the bending shape of the shoulder part from a sheet metal blank, various methods are known.

On the one hand, the final shape can be produced by step-by-step manual bending of the sheet metal blank with constant checking of the bending result with the help of specially prepared bending jaws. It is relatively easy and fast to pre-bend the shape of the shoulder plate, so initially relatively imprecise manufacture, for example, with a deviation of +/- 10 mm from the specified shape. However, an accuracy of at least +/- 0.2 mm is required. Therefore, this method requires a great experience of the worker and a lot of time.

On the other hand, the shaping of the shoulder part can take place simultaneously with the assembly of the shoulder part to the prepared prism part. This is faster but less accurate. If the spatial shape of the shoulder part does not agree with the theoretically determined shape, then the intrinsically exact contour of the forming edge on the prism part is also invalidated. For example, wrinkles can occur during tube forming.

For prism parts made of tubing, for example, a ledge or groove may be milled on the outside of the prism part to facilitate positioning of the shoulder part relative to the forming edge. During assembly of the forming shoulder, the shoulder part is pressed and fixed with its the forming edge of the prism portion facing inner edge of this paragraph or in this groove. In addition to the more accurate positioning of the shoulder part thereby a more accurate fine bending of a pre-bent shoulder part is possible. The manufacture of the paragraph, however, is very complex and requires the use of a multi-axis CNC milling machine.

Out DE 10 2007 050 697 B3 a method for producing a forming shoulder is known in which a prism part and a shoulder part are produced and then joined together along a Umformkante, wherein the prism part is prefabricated with the Umformkante, a prism is attached to the prism part, the shoulder part according to the predetermined by the form of teaching Form is arranged on the prismatic part, and then prism part and shoulder part are joined together. The shape gauge comprises at least one attachable to the prism portion of a forming shoulder first mold element with a contact edge, which defines by at least linear contact with the shoulder part, the shape of the shoulder part relative to the forming edge of the prism part. The proposed solution facilitates the exact formation of the shoulder part of the prism part, however, form shoulders, in which the prism part has a very complex cross-section, yet difficult to produce, because first the form of the form must be accurately formed on the prism part and attached thereto. Especially with these complex cross-sections, however, the exact positioning of the form is very difficult.

Such complex cross-sections occur, for example, in forming shoulders for stand-up pouches with stabilizing seams (e.g., Stabilopack, Quadroseal). Such complex cross sections can be produced economically only by forming flat sheet metal blanks. The use of a form of teaching the positioning of the shoulder part on the prismatic part brings in these cases for the reasons mentioned above, only very limited relief in the connection of the shoulder part and prism part.

Out DE 10 2010 036 229 A1 a method for producing a forming shoulder is known, in which a prism part and a shoulder part, each with a predetermined three-dimensional shape and then joined together along a common three-dimensional forming edge, wherein the prism part and the shoulder part are prefabricated as flat sheet metal blanks, on even flat sheet metal blank the prism part is produced by machining a contact edge, the sheet metal blanks of prismatic part and shoulder part are brought by forming in the predetermined three-dimensional shape, the shoulder part is arranged along the contact edge on the prismatic part, and then prism part and shoulder part are interconnected. The proposed solution facilitates the production of a prismatic part and shoulder part existing form shoulder by the mechanical processing in the flat state enormously. However, the economic expenditures for making the form shoulders are still large. Above all, the joining of the prism part and shoulder part requires an increased workload, since both prism part and shoulder part must be machined exactly prior to joining due to the three-dimensional shape.

It is therefore an object of the invention to provide a forming shoulder and a manufacturing method therefor which overcomes the above difficulties. Another object is to provide a forming shoulder that can be manufactured with simple, inexpensive and labor-saving means.

These objects are achieved by a method having the features of claim 1 and a forming shoulder having the features of claim 6. Advantageous embodiments are set forth in the dependent claims and the description below.

In the method of manufacturing a forming shoulder in which a shoulder member having a predetermined three-dimensional shape is produced, it is proposed to prefabricate the shoulder member as a flat sheet blank to bring the shoulder member into the predetermined three-dimensional shape so that a shoulder edge forms a three-dimensional forming edge of the forming shoulder , And in the surface of the shoulder portion along the forming edge extending groove is formed.

As a result, both the use of materials and the labor of producing a forming shoulder can be reduced. This is primarily due to the fact that the prism part and the shoulder part in the region of the Umformkante no longer have to be adapted to each other and connected to each other. On the prism part can even be dispensed with. It is also advantageous that due to the reduced use of material, the cleaning of the forming shoulder can be substantially facilitated.

For connecting the forming shoulder with a tubular bag machine, however, can still be provided, for example, a calibration ring, which is adapted to adjust the position of the forming shoulder for flow wrapper and whose inner contour defines the cross-sectional contour of the bag to be fabricated, i. calibrated the tube bag.

For this purpose, it is proposed in one embodiment of the method that a calibration ring and a form gauge are produced, a form gauge is attached to the calibrating ring, the shoulder portion is attached to the form gauge according to the shape prescribed by the form gauge, and the forming edge is arranged at a distance from the calibrating ring and is projectable onto the calibration ring.

The groove can, for example, directly by plastic deformation of the shoulder part in Be formed region of the Umformkante from the surface of the shoulder part, said plastic deformation, for example, successively, progressing along the Umformkante, by hand can be made. Along the forming edge at the inlet opening of the forming shoulder can thus be very flexible formed a groove and possibly also subsequently corrected. However, the groove can also be formed, for example, by machining the shoulder part, for example by milling or grinding a groove in the surface of the shoulder part.

In order to meet different inlet angles of a film web over the Umformkante in the inlet opening, i. To optimize the inlet to the effect that the film web creates as wrinkle-free as possible on the forming edge and the shaping of the tube so great stresses in the film web, which could possibly lead to tearing of the film web, it is useful with the groove along the Umformkante form variable fillet width and / or variable groove depth.

Since the plastic deformation of the shoulder part to form the groove is made with suitable tools, it can be provided that the forming edge is mechanically reworked after the formation of the groove. During the plastic deformation resulting burrs in the region of the forming edge can be removed thereby, so that the film web can not be injured.

The proposed forming shoulder for the production of tubular bags comprises a shoulder part with a predetermined three-dimensional shape. Here, the shoulder part is made by forming from a flat sheet metal blank, wherein a shoulder edge portion forms a three-dimensional forming edge of the forming shoulder and wherein in the surface of the shoulder portion along the forming edge extending groove is formed.

In one embodiment of the forming shoulder, the forming shoulder comprises a calibrating ring and a forming jig, wherein the forming jig is arranged on the calibrating ring and the shoulder portion is arranged on the forming jig in accordance with the shape prescribed by the forming jig so that the forming edge is arranged at a distance from the calibrating ring the calibration ring is projected.

It is expedient that the groove along the Umformkante with variable groove width and / or variable groove depth is formed.

Hereinafter, an embodiment of the described form shoulder and the method for their preparation will be explained in more detail with reference to drawings. Show

1 a detail of a deep groove on the forming edge,

2 a sectional view of a shoulder part in the region of a deep groove on the Umformkante,

3 a detail of a flat groove on the forming edge,

4 a sectional view of a shoulder part in the region of a flat groove on the Umformkante and

5 a form shoulder according to the invention.

5 shows an assembly drawing of a form shoulder according to the invention 1 comprising a shoulder part 2 , a calibration ring 3 and a form theory 4 , By means of the calibration ring 3 becomes the finished form shoulder 1 connected to a packaging machine, not shown, for the production of tubular bags. At the calibration ring 3 is the form theory 4 attached, on which in turn the shoulder part 2 is appropriate. The shoulder part 2 is before joining with the form gauge 4 by forming a flat sheet metal part in one of the form of teaching 4 corresponding three-dimensional shape brought. The shoulder part 2 becomes according to that of the form theory 4 predetermined form so in the form of teaching 4 attached, that a shoulder edge part one with a distance to the calibration ring 3 arranged and one on the calibration ring 3 projectable three-dimensional forming edge 5 forms. In the surface of the shoulder part 2 is one along the forming edge 5 running throat 6 educated.

During the joining of the shoulder part 2 and form theory 4 can make adjustments to the shape of the shoulder part 2 be made to fit a tight fit on the form gauge 4 to reach.

Depending on the inlet angle of a film web, not shown on the groove 6 and over the forming edge 5 in the inlet opening 7 is the forming edge 5 formed with different groove widths L1, L2, groove depths T1, T2 and corresponding Umformkantenwinkeln A1, A2. 2 shows a section through the shoulder part 2 along the in 5 illustrated section line B. 4 however, shows a section through the shoulder part 2 along the in 5 shown section line A. In the region of Umformkante 5 the cutting line A runs the film web at a different angle in the inlet opening 7 the form shoulder 1 than in the area of the forming edge 5 the section line B. From the zu 2 corresponding detail view of the forming edge 5 in 1 with the groove width L1 and the groove depth T1 and the zu 4 corresponding detail view of the forming edge 5 in 3 with the fillet width L2 and the groove depth T2 are the differences in the formation of the Umformkante 5 and the throat 6 clearly.

Advantageously, the groove widths L1, L2, the groove depths T1, T2 and the corresponding Umformkantenwinkel A1, A2 at the finished, ie assembled, form shoulder 1 formed and, if necessary, be changed, so that an adaptation to a material of the film web, not shown, is possible if this material is changed, for example, for the production of other tubular bag. In contrast to the prior art, the forming edge 5 also slightly changing conditions, such as material wear of the shoulder part 2 be adjusted.

LIST OF REFERENCE NUMBERS

L1

 first fillet width

T1

 first groove depth

A1

 first forming edge angle

L2

 second fillet width

T2

 second groove depth

A2

 second forming edge angle

1

 forming shoulder

2

 shoulder part

3

 calibrating

4

 morphology

5

 forming edge

6

 fillet

7

 inlet port

A

 intersection

B

 intersection

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 20320160 U1 [0002]
• DE 102007050697 B3 [0011]
• DE 102010036229 A1 [0013]

Claims (9)

Method for producing a forming shoulder ( 1 ), in which a shoulder part ( 2 ) is produced with a predetermined three-dimensional shape, wherein the shoulder part ( 2 ) is prefabricated as a flat sheet metal blank, the shoulder part ( 2 ) is brought into the predetermined three-dimensional shape, so that a shoulder edge part of a three-dimensional forming edge ( 5 ) of the form shoulder ( 1 ) and in the surface of the shoulder part along the Umformkante ( 5 ) running groove ( 6 ) is formed. Method according to claim 1, characterized in that the groove ( 6 ) by partial plastic deformation of the shoulder part ( 2 ) is formed. Method according to one of the preceding claims, characterized in that a calibration ring ( 3 ) and a theory of form ( 4 ), on the calibration ring ( 3 ) a form theory ( 4 ), the shoulder part ( 2 ) according to the theory of form ( 4 ) predetermined form so on the theory of form ( 4 ), that the forming edge ( 5 ) with a distance to the calibration ring ( 3 ) and placed on the calibration ring ( 3 ) is projectable. Method according to one of the preceding claims, characterized in that the groove ( 6 ) along the forming edge ( 5 ) is formed with variable groove width and / or variable groove depth. Method according to one of the preceding claims, characterized in that the forming edge ( 5 ) following the formation of the fillet ( 6 ) is mechanically reworked. Form shoulder ( 1 ) for the production of tubular bags, comprising a shoulder part ( 2 ) having a predetermined three-dimensional shape, wherein the shoulder part ( 2 ) is made by forming from a flat sheet metal blank, a shoulder edge part of a three-dimensional forming edge ( 5 ) of the form shoulder ( 1 ) and wherein in the surface of the shoulder part along the Umformkante ( 5 ) running groove ( 6 ) is trained. Form shoulder ( 1 ) according to claim 6, characterized in that the groove ( 6 ) by partial plastic deformation of the shoulder part ( 2 ) is formed. Form shoulder ( 1 ) according to claim 6 or 7, characterized in that the forming shoulder ( 1 ) a calibration ring ( 3 ) and a theory of form ( 4 ), whereby the theory of form ( 4 ) on the calibration ring ( 3 ) and the shoulder part ( 2 ) according to the theory of form ( 4 ) given shape so on the theory of form ( 4 ) is arranged, that the forming edge ( 5 ) with a distance to the calibration ring ( 3 ) and placed on the calibration ring ( 3 ) is projectable. Form shoulder ( 1 ) according to one of claims 6 to 8, characterized in that the groove ( 6 ) along the forming edge ( 5 ) is designed with variable groove width and / or variable groove depth.

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