CN105437604B

CN105437604B - Extrusion tool

Info

Publication number: CN105437604B
Application number: CN201510606004.9A
Authority: CN
Inventors: M.卡诺; D.格雷科; R.马莱克
Original assignee: Volkswagen AG
Current assignee: Volkswagen AG
Priority date: 2014-09-22
Filing date: 2015-09-22
Publication date: 2020-07-17
Anticipated expiration: 2035-09-22
Also published as: DE102014219021A1; CN105437604A; EP2998042A1; EP2998042B1

Abstract

The invention relates to an extrusion tool for producing a sheet metal profile, comprising: a first mold portion having a first topology for forming a sheet form from a sheet; and a second mould part having a second topology for forming a plate shaped part, wherein the first and second topologies are coordinated with each other so as to provide the plate shaped part with a desired shape under the co-action of the two topologies by bringing the two mould parts together, and wherein one of the first and second topologies carries a female mould and the other of the first and second topologies carries a male mould so as to press the plate into the female mould for manufacturing the plate shaped part upon bringing the two mould parts together. In order to be able to produce sharp contours, such as sharp smooth edges or design lines, at the sheet metal profile, the male tool has an elastic material, so that when the two tool parts are brought together, the sheet metal part is pressed into the female tool under elastic deformation of the elastic material for producing the sheet metal profile.

Description

Extrusion tool

Technical Field

The invention relates to a pressing tool (Presswerkzeug) for producing molded sheet metal parts (Blechumformteil).

Background

In this case, the topology (Topografie) of one mold part (Werkzeugteil) provided for forming the sheet metal part has projections (ereibung) in the form of ribs or nubs (Noppe) as male molds (posivvorm) and the topology of the other mold part provided for forming the sheet metal part has recesses (Ausnehmung) in the form of grooves or grooves opposite the projections (formnegativ) as female molds (negeform), in order to form a microstructure (feinstrtur) of a (Beulenf ö rmig) embossed section (einder ü ckung) with raised marks at the sheet metal part under the combined action of the projections and recesses when the two mold parts are brought together.

According to one embodiment of the known pressing tool, instead of the recess, an elastic filling (Einlage) can also be provided in the other tool part. In the molding process (umformprazess), the elastic filling is then pressed in by the pressure of the projections, so that the sheet material can be placed in these impressions in a convex manner in the elastic filling.

More recently, design elements in the form of sharp light edges (L ichtkante) or design lines (design lines), for example cyclone lines (Tornadolinie) on the outer side or visible side thereof, have been provided more at the outer skin part (sheet metal part) of the vehicle body if such an outer skin part is to be produced using a pressing tool as known from DE 19621942C 1, the radius of the convex edge formed on the outer side of the outer skin part is not small enough to form a sharp light edge or design line that meets the quality requirements.

This is based, inter alia, on the fact that, in the case of a configuration of the male die which is then required to have a sharp profile (which interacts with the elastic filling of the forming die), a strong tensile bending load (streckbieblebensolution) is generated in the forming region which leads to the plate material yielding in advance, as a result of the sharp profile of the male die, such as a sharp punch edge (Stempelkante) or a punch edge provided with a smaller outer radius, the material strength (material ä rke) of the plate material is weakened in the forming region and the sharp profile of the male die is insufficiently molded on the side of the plate facing away from the male die (outer side or visible side).

Disclosure of Invention

The object of the invention is to improve the pressing tool in such a way that sharp contours (e.g. sharp light edges or design lines) can be produced at the sheet metal profile.

This is achieved with the pressing tool according to the invention.

According to the invention, the pressing tool has a first mold part and a second mold part for producing the sheet metal molded part. The first mold portion has a first topology for forming a sheet form from a sheet form and the second mold portion has a second topology for forming a sheet form. The first and second topologies are coordinated with one another, i.e. are designed, for example, approximately or approximately complementary to one another, in order to provide the sheet metal molding with the desired shape by bringing the two mold parts together under the interaction of the two topologies. One of the first and second topologies has a female die and the other of the first and second topologies has a male die so that the plate member is pressed into the female die to produce the plate shaped member when the two die portions are brought together. The pressing tool according to the invention is characterized in that the male tool has an elastic material, so that when the two tool parts are brought together, the sheet metal part is pressed into the female tool under elastic deformation of the elastic material to produce the sheet metal part.

In the sense of the present invention, the first and second topographies are formed by the respective faces of the first and second mold parts (which participate in the shaping of the sheet-shaped part under the contact of the sheet metal parts) and have, for example, an outer radius, an inner radius, a projection or a bulge, a depression or an undercut and/or a flat section, etc., depending on the desired shape of the sheet-shaped part.

In the sense of the present invention, the projections or elevations in the respective topology are considered as positive molds and the recesses or undercuts opposite the positive molds are considered as negative molds for receiving the positive molds.

According to the invention, a flexible elastic material is provided on the male tool, so that the male tool can press the sheet metal part into the female tool under elastic deformation of the elastic material to produce the sheet metal part. By means of the elastic deformation of the elastic material, the male tool is pressed against the surface of the sheet-metal part in the molding region with an increased contact area, so that the sheet-metal part can be pressed into the female tool optimally under the effect of the high frictional forces between the elastic material and the sheet-metal part. In other words, according to the invention, only the female die defines the contour to be produced on the female die side at the sheet metal blank and the male die matches the female die during the forming process.

It is thus possible to produce sharper contours (e.g. sharp light edges or design lines) at the sheet metal profile while avoiding high tensile bending loads in the molding region and thus while avoiding premature yielding of the sheet material and a weakening of the material strength of the sheet material in the molding region.

According to one embodiment of the invention, the elastic material comprises a polymeric material. Preferably, the elastic material has an elastomeric material and in particular a rubber material, for example a hard rubber material.

According to a further embodiment of the invention, the elastic material is inserted as an insert (Einsatzteil) into the base material of the tool part provided with the male tool. This ensures a simple and robust construction of the pressing tool and a simple replaceability of, for example, a worn-out male die. Preferably, the first and second tool parts each have a metallic material, for example a steel material and/or a cast iron material, as a base material.

According to a further embodiment of the invention, the insert formed from an elastic material is configured in the form of a strip (L esitenf ö rmig) and is inserted into the base material of the mold part provided with the male mold such that the longitudinal edge section of the insert projects from the base material of the mold part by a predetermined amount, in particular 2mm to 10mm and preferably 2mm to 5 mm.

According to one embodiment of the invention, the female die has an inner radius to form a convex edge on the flat side (fiaechensite) of the sheet metal part, and the male die has an outer radius formed from an elastic material to press the sheet metal part into the inner radius of the female die when the two die parts are brought together, with the outer radius being elastically deformed to form the edge, in order to produce the sheet metal part.

According to a further embodiment of the invention, the pressing tool is set up for carrying out a deep-drawing process (Tiefziehvorgang) on the plate, wherein the first tool part is designed as a punch and has a male tool in its first topology and the second tool part is designed as a female tool in its second topology.

According to a further embodiment of the invention, the sheet metal profile is provided as a shell part of a vehicle body, wherein the female die and the male die are designed to form a design line or a smooth edge as a convex edge on the outer side of the sheet metal profile.

The features disclosed in the invention can be combined with one another as far as this is technically expedient.

Drawings

The invention is described below with reference to the preferred embodiments and with reference to the figures. Wherein:

fig. 1 shows a press tool according to an embodiment of the invention and a sheet metal part inserted into the press tool in a state separated from each other in a side sectional view.

Fig. 2 shows the press tool of fig. 1 and a sheet metal profile formed from sheet metal parts in a state brought together in a side sectional view.

Fig. 3 illustrates the problem of insufficient shaping of the male die with a sharp profile on the side of the sheet metal form facing away from the male die in an enlarged lateral sectional view.

List of reference numerals

1 extrusion tool

10 first mould part

11 first topology

12 male die

12'' male die

20 elastic material

30 second mould part

31 second topology

32 female die

B plate

B' plate forming part

B' contrast plate molding

K' edge

K' edge.

Detailed Description

Next, a pressing tool 1 according to an embodiment of the present invention will be described with reference to fig. 1 to 3.

The pressing tool 1 is set up to produce a sheet metal part B' of a blank form, for example of aluminum or steel, with a deep-drawing operation being carried out, with the desired shape. In the present embodiment, the sheet metal part B' is provided as a housing part (not shown in full) of the vehicle body and in particular as a housing part of a vehicle side door of the vehicle body.

The pressing tool 1 has a lower first die part 10 forming the punch of the pressing tool 1 and an upper second die part 30 forming the die of the pressing tool 1. Fig. 1 shows the two

tool parts

10,30 in a state separated from one another, wherein the already preformed sheet metal part B is inserted into the press tool 1 between the

tool parts

10, 30. While figure 2 shows the two

mould parts

10,30 in the brought-together state with the sheet-formed part B' brought into the desired shape between them.

The first die part (punch) 10 has a first topology 11 of a substantially convex or male design for forming the sheet metal part B'. The second mold part (matrix) 30 has a second topology 31 of a substantially concave or negative design for forming the sheet metal part B'. The first and

second topologies

11,31 are coordinated with one another, that is to say are configured approximately or approximately complementary to one another, in order to provide the desired shape to the sheet metal molding B' under the interaction of the two

topologies

11,31 by bringing the two

mold parts

10,30 together as shown in fig. 2.

In its second topology 31, second mold part 30 has a female mold 32 with a smaller inner radius, in order to form a convex edge K 'with a smaller outer radius, in particular a polygonal design line or light edge, such as a cyclone line, on the planar side (later outer or visible side) of sheet metal part B'. The first tool part 10 has in its first topology 11 a male tool 12 with an outer radius formed from the elastic material 20, in order to press the sheet metal part B into the inner radius of the female tool 32 for producing the sheet metal part B 'when the two

tool parts

10,30 are brought together, with elastic deformation of the outer radius formed from the elastic material 20 to form the edge K'.

As can be seen from fig. 1, the outer radius of the male tool 12 is greater than the inner radius of the female tool 32, in other words, according to the invention, the inner radius of the female tool 32 of the second tool part (female tool) 30 defines the profile of the edge K '(design line or light edge of a prism) or appears sharp on the outside or visible side of the sheet metal part B' (Pr ä gnanz).

The first and

second mould parts

10,30 are manufactured as a base material from a metallic material, such as a steel material and/or a cast iron material, respectively. The elastic material 20 is inserted as a strip-shaped insert into the base material of the first mold part 10 (the longitudinal direction of the strip-shaped elastic material 20 extends perpendicular to the plane of the drawing) such that a longitudinal edge section of the insert defining the outer radius of the male mold 12 projects from the base material of the first mold part 10 by a predetermined amount (for example 2mm to 10mm and preferably 2mm to 5 mm). According to the invention, the elastic material 20 is a polymeric material and in particular an elastomeric material. Preferably, the elastic material 20 is a rubber material, such as a hard rubber material in particular.

When the two

tool parts

10,30 are brought together in the state shown in fig. 2, the flexible outer radius (flexible punch edge) of the male tool part 12 of the first tool part 10 (punch) presses the sheet metal part B into the inner radius of the sharp or pointed profile of the defined edge K 'of the female tool part 32 of the second tool part (female tool) 30 under the action of the high friction forces between the elastomer material 20 and the sheet metal part B and the elastic deformation of the outer radius of the male tool 12 in order to produce the sheet metal part B'.

Fig. 3 shows for comparison the problem of an insufficient or excessively large outer diameter of the edge K "(design line or smooth edge of a prism) produced on the outer or visible side of the reference sheet metal part B", if the choking of the edge K "is effected as is conventional by a sharp contour, such as the smaller outer diameter of the punch 12" (sharp punch edge).

As can be seen from fig. 3, the sharp contour of the male die 12 ″ generates a strong tensile bending load in the forming region, which leads to the early onset of yielding of the sheet material (here, for example, aluminum). In contrast sheet metal molding B ", the material strength of the sheet material is thereby reduced by approximately one third in the molding region and the outer diameter of edge K", produced on the outer or visible side of contrast sheet metal molding B ", is greater than the outer diameter of the punch 12". As a result, the edge K ″ produced at the reference plate profile B ″ does not have a sufficiently short or sufficiently sharp contour in order to be able to comply with the quality requirements for sharp light edges or design lines.

Claims

1. An extrusion tool (1) for producing a sheet metal part (B') from a sheet metal part (B), having: a first mould part (10) having a first topology (11) for forming the sheet shaped part (B'); and a second mould part (30) having a second topology (31) for forming the sheet shaped part (B '), wherein the first and second topologies (11,31) are coordinated with each other in order to provide the sheet shaped part (B ') with a desired shape under the combined action of the two topologies (11,31) by bringing together the two mould parts (10,30), and wherein one (31) of the first and second topologies has a female mould (32) and the other (11) of the first and second topologies has a male mould (12) in order to press the sheet piece (B) into the female mould (32) for producing the sheet shaped part (B ') when bringing together the two mould parts (10,30), characterized in that the male mould (12) has an elastic material (20) in order to, when bringing together the two mould parts (10,30) pressing the sheet metal part (B) into a female die (32) under elastic deformation of the elastic material (20) when brought together for producing the sheet metal shaped part (B '), wherein the female die (32) has an inner radius in order to form a convex edge (K ') on the planar side of the sheet metal shaped part (B '), and wherein the male die (12) has an outer radius formed from the elastic material (20) in order to press the sheet metal part (B) into the inner radius of the female die (32) with the outer radius elastically deformed to form the edge (K ') when the two die parts (10,30) are brought together for producing the sheet metal shaped part (B '), and wherein the outer radius of the male die (12) is greater than the inner radius of the female die (32).

2. The pressing tool (1) according to claim 1, wherein the elastic material (20) is a polymeric material.

3. The pressing tool (1) according to claim 1 or 2, wherein the resilient material (20) is an elastomeric material.

4. The pressing tool (1) according to any one of claims 1-2, wherein the resilient material (20) is a rubber material.

5. The extrusion tool (1) according to any one of claims 1-2, wherein said elastic material (20) is inserted as an insert into a base material of a mould part (10) provided with said male mould (12).

6. The pressing tool (1) according to claim 5, wherein the first and second die parts (10,30) each have a metallic material as a base material.

7. The pressing tool (1) according to claim 5, wherein the insert formed in the elastic material (20) is configured in a strip shape and is inserted into a base material of a mould part (10) provided with the male mould (12) such that a longitudinal edge section of the insert projects a predetermined amount from the base material of the mould part (10).

8. The pressing tool (1) according to one of claims 1 to 2, wherein the pressing tool (1) is set up for carrying out a deep drawing process at the sheet (B), wherein the first die part (10) is configured as a punch and has the male die (12) in its first topology (11), and wherein the second die part (30) is configured as a female die and has the female die (32) in its second topology (31).

9. The extrusion tool (1) according to any one of claims 1-2, wherein the sheet shaped part (B ') is provided as a shell part of a vehicle body, and wherein the female die (32) and the male die (12) are configured to form a design line of a prism shape on an outer side of the sheet shaped part (B').