WO2010105826A1

WO2010105826A1 - Forming tool, in particular a kneading tool

Info

Publication number: WO2010105826A1
Application number: PCT/EP2010/001700
Authority: WO
Inventors: Fritz Binhack
Original assignee: Felss Gmbh
Priority date: 2009-03-18
Filing date: 2010-03-18
Publication date: 2010-09-23
Also published as: US20120060577A1; DK2408577T3; KR20120004453A; EP2408577A1; AU2010225136A1; EP2408577B1; PL2408577T3; CN102413959A; JP2012520772A; CN102413959B

Abstract

The invention relates to a forming tool, in particular a kneading tool, which has a base body (12'), in which at least one forming element (21) is disposed, inclined at a first angle of inclination (a1) to a central axis (M) of the deformation tool (12), which results in the determination of an inlet chamfer (S) of the forming element (12). According to the invention, it is provided that in the surface (21') of the forming element (21) running in an inclined manner below the first angle of inclination (a1) a recessed surface structure (22) is formed, which has at least one recess (23) with a trailing edge (23a), and that the trailing edge (23a) of said recess (23), related to the inlet chamfer (S) of the forming element (21) defined by the first angle of inclination (a1), has a second angle of inclination (a2), which is oriented towards the opposite direction with regard to the first angle of inclination (a1), and the absolute value thereof is larger than or equal to the absolute value of the first angle of inclination (a1).

Description

Forming tool, in particular kneading tool

description

The invention relates to a forming tool, in particular kneading tool, which has a base body, in which at least one forming element is arranged, which extends inclined at a first angle of inclination to a central axis of the forming tool, whereby an inlet slope of the forming element is fixed.

Such a forming tool is known from DE 103 28 052 B4 of the Applicant and is used for forming, in particular for rotary kneading, of workpieces in a forming machine. In such a case by means of the Forming known forming process occur in the so-called feed process as well as the so-called piercing - depending on the first inclination angle of the forming element of the forming tool, which acts on the workpiece in the radial direction - significant forces acting on the workpiece in the axial direction. These can disadvantageously lead to damage images on the workpiece, which are in the form of bulges or buckling. Moreover, the axial force produced by the forming tools adversely affects both the forming machine and the feed system for the workpiece and the clamping device holding the workpiece, since the axial forces produced during the forming process must be compensated for by these devices by the abovementioned devices , In order to counteract these axial forces, DE 103 28 052 B4 provides that a raised, relief-like and undulating surface structure is provided on the surface of the forming element of the forming tool, which has a plurality of elevations. By this raised surface structure on the surface of the forming element, a forming tool is provided, which is characterized in that the machined with this forming workpieces are characterized by a high surface quality of the machined area. However, it is desirable to further reduce the loads caused by the axial forces during the forming process.

It is an object of the present invention to develop a forming tool of the type mentioned that a reduction of the axial forces is achieved by the forming tool according to the invention.

This object is achieved in that a recessed surface structure is formed in the surface of the obliquely extending under the first tilting forming element, which has at least one recess with a sloping edge, and that the falling edge of this depression, based on the by the first Slope angle defined inlet an angle of the Umformelements, a second inclination angle, which is oriented opposite to the first inclination angle and its absolute value is greater than or equal to the absolute amount of the first inclination angle.

The inventive measures is achieved in an advantageous manner that in the surface of the Umformelements at least one, but preferably a plurality of depressions are arranged, the falling edge is more inclined than the forming element and opposite to its inclination is oriented. As a result, the falling flanks of the recesses receive an axial force component when radial deformation forces impinge upon the workpiece, so that the axial forces acting on the feed device of the forming machine and caused by the machining process are reduced.

An advantageous development of the invention provides that at least one depression, but preferably all depressions of the surface structure introduced into the surface of the deformation element, are arranged orthogonally or substantially orthogonal to its longitudinal extent. These measures have the advantage that such an arrangement of the depressions of the surface structure according to the invention causes only an extremely low torsional load to be applied to the workpiece, which arises because the running forming tool rotates in the circumferential direction around the stationary workpiece during the forming process , The orthogonal to the longitudinal extent and thus to the feed direction of the workpiece arranged recess cause therefore advantageously not only low axial forces, but also that the forming tool brings little or no torsional force into the workpiece.

A further advantageous development of the invention provides that at least two depressions of the surface structure of the forming element of the forming tool according to the invention are parallel or substantially parallel to one another - A -

run. Such a measure in turn has advantages in view of a low torsional load on the workpiece to be machined by the forming tool according to a further advantageous development of the invention, that at least two depressions of the surface structure of at least one Umformele- element essentially one have a straight course.

A further advantageous embodiment of the invention provides that at least two recesses of the surface structure of the forming tool according to the invention are arranged obliquely to the longitudinal extension of the forming element. As a result, a greater torsional load is exerted on the workpiece by the forming tool according to the invention than is the case with depressions arranged orthogonally to the longitudinal extension of the shaping element and thus to the feed direction of the workpiece. However, the oblique arrangement of the recesses of the surface structure has the advantage that in workpieces in which the torsional load occurring is not disturbing, thereby further reducing the force acting on the feed device and thus opposite to the feed direction of the forming axial forces is achieved.

Further advantageous developments of the invention are the subject of the dependent claims.

Further details and advantages of the invention can be taken from the exemplary embodiment, which will be described below with reference to the figures. It shows:

FIG. 1: a front view of the exemplary embodiment,

Figure 2: a longitudinal section through the forming tool of Figure 1 along the line M-Il 3 shows a schematic representation of the surface structure, and

FIG. 4 shows a schematic representation of a tool head of a rotary swaging machine with the forming tool of FIGS. 1 to 3.

Before describing in detail the embodiment illustrated in FIGS. 1 to 3 of a forming tool generally designated 12, the basic operations in a forming operation by means of such a forming tool will be described for ease of understanding: In FIG The round kneading head is a rotary kneading machine, that is to say a tool head of a forming machine, which, as is known, has a kneading shaft 2 with - in the case shown here - four radially displaceable kneading modules. Each kneading module has a kneading tappet 10, which has a discharge path 4 at its radially outer end, which are acted upon periodically by pressure rollers 6 mounted in a roller cage 5, by rotationally driving the kneading shaft 2 and / or the roller cage 5 via an outer ring 7 become. The pressure rollers 6 are based here on the outer ring 7. Apart from the kneading tappet 10, the kneading modules also have a compensating plate 11 and in each case the forming tool 12. Such a swaging head 1 is known per se and therefore does not need to be described in any more detail.

In order then to create a final product from a tubular or rod-shaped starting workpiece, which in a first region also has the non-reduced starting diameter of the starting workpiece, in a second region a region reduced from the starting diameter by the forming and between the first and second regions Transition region in which the outer diameter of the workpiece continuously increases from the reduced diameter to the initial diameter, that is, an axially extending transition region at the end workpiece is present, is known to proceed such that the Umformwerk- 2 - as shown in FIG. 2, a forming element 21 arranged in a base body 12 'of the forming tool 12 is arranged at a defined first angle of inclination α i to the center axis M of the forming tool 12 and thus to the feed direction of the workpiece. Also, such a trained forming tool 12 is known per se and therefore need not be described in detail. It should be made only for the sake of clarity that due to the radial forming force generated by the forming tool, due to the oblique arrangement of the forming elements 21 causes a force acting in the axial direction of the workpiece force which loads the workpiece and from a feed device (not shown) of the forming machine, through which the workpiece is advanced during the forming process, must be compensated.

In order to better compensate for these axial forces and thus further reduce axial load on the workpiece, which can lead to buckling and bulges, as well as the feed device, it is now provided in the described forming tool 12 that in the surface 21 'of the Umformelements 21 a relation to the Surface 21 recessed surface structure 22 is provided, which has at least one recess 23, but usually a plurality of recesses 23 (see Figure 2). The exact formation of the surface structure 22 will now be explained with reference to FIG. 3, in which an exemplary example thereof is illustrated. It must therefore be emphasized that the angles, radii and other dimensions given there as well as the exact course of the surface structure 22 are only of an exemplary nature and the following description does not affect the generality of the explanations:

FIG. 3 now shows a cross section through the surface structure 22 shown in FIG. 2. The surface 21 'of the forming element 21 of the forming tool 12 can be seen, and furthermore that the surface structure 22 does not touch the surface, as in the known forming tool explained in the introduction. che 21 'attached, so executed exalted. Rather, it is provided that the recesses 23 are introduced into the surface 21 'of the forming element 21. In the case described here, the inlet bevel S of the deformation element 21, ie the first inclination angle, αi = 10 °, relative to the central axis M of the tool. Each of the recesses 23 has a sloping edge 23a and a rising edge 23b, wherein - as also seen in Figure 4 - the falling edge 23a of a recess 23 with respect to the inlet slope S by a second inclination angle of (here :) α ₂ = 29 ° inclined runs. The inclination of the flanks 23a relative to the central axis M thus has the value O ₂ - O ₁ . The inclination of the trailing edges 23a of the recesses 23 is orienta- opposite advantage to the .alpha..sub.i determined by the first inclination angle oblique course of the deforming element 21 and the absolute value of the second inclination angle α ₂ is here therefore greater than that of the first inclination angle .alpha..sub.i of the forming tool 12. This opposite orientation of the inclination of the Umformelements 21 and the falling edges 23 of the recesses 23 causes axial forces caused by the kneading modules are partially absorbed by the forming tool 12 and therefore no longer act on the workpiece and / or the feed device of the forming machine since these axial forces are absorbed by the flanks 23a oriented opposite to the inclination of the deformation element 21. The sloping flanks 23a of the recesses 23 thus form a kind of abutment for these axial forces and divert them into the forming tool 12: By subjecting the workpiece 12 through the kneading modules 10, the material areas of the workpiece lying above the recesses 23 yield back, so that then the falling edges 23a of the recesses 23 act on the workpiece in the feed direction.

From the above description, it is clear to the person skilled in the art that the values of the first inclination angle of αi = 10 ° and of the second inclination angle α ₂ = 29 ° selected here by way of example only have an exemplary character. Essentially, only that the flanks 23a are so opposite the inlet slope S off that the absolute value of the second inclination angle Ü2 is equal to the absolute value of the first inclination angle αi.

It should also be noted at this point that the wavy course of the surface structure 22 shown in FIG. 3 is not mandatory. It is Z. B. also possible to form the recesses 23 sawtooth, in which case the rectilinear sloping edge 23a of such a sawtooth partially absorbs the axial forces.

As can now be seen from FIG. 2, the surface structure 22 has at least one, but in practice a multiplicity of depressions 23 which are preferably parallel or substantially parallel to one another and - again preferably substantially orthogonal to the longitudinal direction of the forming tool 12 and thus are arranged to the feed direction V of the workpiece. But it is also possible that at least one of the recesses 23 is not - as shown in the figures Ren - orthogonal to the longitudinal direction of the forming tool 12 is arranged to extend, but extends obliquely thereto at a defined angle.

In summary, it should be noted that by the described embodiment of the forming tool 12 with a recessed surface structure 22 in conjunction with the described configuration of the recesses 23 and in particular those of the sloping flanks 23a, a forming tool 12 is provided, which is characterized in that a significant reduction of on the workpiece and / or the feed device of the forming machine acting axial forces can be achieved.

Claims

claims

1. forming tool, in particular kneading tool, which has a base body (12 ') in which at least one forming element (21) is arranged, which at a first inclination angle (α-i) to a central axis (M) of the forming tool (12) is inclined , creating an inlet slope

(S) of the Umformelements (12) is fixed, characterized in that in the surface (21 ') of the first inclination angle (CH) obliquely forming element (21) a recessed formed surface structure (22) is formed, the at least one recess (23) with a falling edge (23a) has, and that the falling edge (23a) of this recess (23), based on the by the first inclination angle (α-i) defined inlet slope (S) of the forming element (21), a second inclination angle (α ₂ ) which is opposite to the first inclination angle (α-i) and whose absolute value is greater than or equal to the absolute value of the first inclination angle (α-i).

2. Forming tool according to claim 1, characterized in that the surface structure (22) is wave-shaped.

3. Forming tool according to claim 1, characterized in that at least one recess (23) is formed like a sawtooth.

4. Forming tool according to one of the preceding claims, characterized in that at least two recesses (23) of the surface structure (22) of at least one forming tool (22) of the forming tool (22) are arranged substantially parallel to each other.

5. Forming tool according to one of the preceding claims, characterized in that at least one recess (23) of the surface structure (22) of at least one forming element (21) of the forming tool (12) in is arranged substantially orthogonal to the longitudinal direction of the forming tool (12).

6. Forming tool according to one of the preceding claims, characterized in that at least one recess (23) of the surface structure (22) of at least one forming element (21) of the forming tool (12) in a direction orthogonal to the feed direction (V) of the workpiece is substantially rectilinear ,

7. Forming tool according to one of the preceding claims, character- ized in that at least one recess (23) of the surface structure

(22) of at least one forming element (21) of the forming tool (12) is curved or wave-shaped.

8. Forming tool according to one of the preceding claims, character- ized in that at least one recess (23) of the surface structure

(22) at least one forming element (21) of the forming tool (12) is arranged obliquely to the longitudinal direction of the forming tool (12).

9. forming machine, in particular rotary swaging machine, which has a Umformwerk- tool (12) for the radial loading of a workpiece, characterized by at least one forming tool (12) according to one of the preceding claims.