Method for Transverse Rolling

Abstract

The present invention relates to a cross rolling method having the step of shaping a component blank rotating about a main axis of rotation by means of at least two cross rolling tools located substantially opposite each other with respect to the component blank for the production of a component (1, 2) that is at least partly non-rotationally symmetrical and non-cyclically symmetrical with respect to the main axis of rotation, by moving the cross rolling tools along their main direction of movement. The invention also relates to a cross rolling tool for producing an at least partly non-rotationally symmetrical and non-cyclically symmetrical component (1, 2). Likewise, the present invention relates to an apparatus for carrying out the method according to the invention and a component (1, 2) produced in accordance with the method according to the invention.

Claims

1. Cross rolling method having the step of shaping a component blank rotating about a main axis of rotation by means of at least two cross rolling tools located substantially opposite each other with respect to the component blank for the production of a component (1, 2) that is at least partly non-rotationally symmetrical and non-cyclically symmetrical with respect to the main axis of rotation, by moving the cross rolling tools along their main direction of movement.

2. Cross rolling method according to claim 1, wherein the main direction of movement is a rotational or translational main direction of movement.

3. Cross rolling method according to claim 1, wherein the cross rolling method is a round cross rolling method or a flat die cross rolling method.

4. Cross rolling method according to claim 1, wherein the component blank is shaped by the tool geometry of the cross rolling tools.

5. Cross rolling method according to claim 1, wherein the cross rolling tools are two tool rolls preferably rotating in the same direction with a rotational main direction of movement about their axis of rotation, or two tool plates running translationally with respect to each other with their translational main direction of movement in the plane of their extent.

6. Cross rolling method according to claim 5, wherein the axes of rotation of the tool rolls and the translational main directions of movement of the tool plates are oriented parallel to one another.

7. Cross rolling method according to claim 1, wherein, at least in the areas in which the component (1, 2) is intended to be formed non-rotationally symmetrically and non-cyclically symmetrically, the cross rolling tools have a surface contour which is complex and preferably resulting from the application of material flow FEM (finite element methods).

8. Cross rolling method according to claim 1, wherein, viewed over their circumference, at least in the areas viewed in the axial direction with respect to their axis of rotation in which the component (1, 2) is to be formed non-rotationally symmetrically and non-cyclically symmetrically, the surfaces of the cross rolling tools have a non-constant spacing from the axis of rotation.

9. Cross rolling method according to claim 1, wherein, viewed along the plane of their extent, at least in the areas along the translational main direction of movement in which the component (1, 2) is intended to be non-rotationally symmetrically and non-cyclically symmetrically formed, the surfaces of the cross rolling tools have a non-constant spacing from the plane of extent.

10. Cross rolling method according to claim 1, wherein the surface areas of a cross rolling tool that are effective for the shaping are always located accurately opposite the same surface areas of the component blank that are to be shaped.

11. Cross rolling method according to claim 1, wherein the rolling operations between component blank and cross rolling tools are coordinated with one another in such a way that, as viewed over the circumference of the component blank, the same areas of the cross rolling tools are always assigned to the same areas of the component blank.

12. Cross rolling method according to claim 1, wherein, at least in the surface areas in which the component (1, 2) is intended to be formed non-rotationally symmetrically and non-cyclically symmetrically, as viewed along its surface in the main direction of movement, one of the cross rolling tools has at least one subarea with a contour through which material is forced at right angles to the main axis of rotation of the component blank, preferably radially, wherein the opposite cross rolling tool has a corresponding contour assigned to the subarea of the one cross rolling tool and preferably located opposite in a subarea, in order to accommodate the material forced at right angles to the main axis of rotation of the component blank in the corresponding contour.

13. Cross rolling method according to claim 1, wherein, at least in the surface areas in which the component (1, 2) is to be formed non-rotationally symmetrically and non-cyclically symmetrically, one of the cross rolling tools, as viewed along its surface in the main direction of movement, has at least one subarea with a contour in order to force material at right angles to the main axis of rotation of the component blank, preferably radially, wherein the opposite cross rolling tool has a contour assigned to the subarea of the one cross rolling tool and preferably located opposite in a subarea, in order in the same way to force material at right angles to the main axis of rotation of the component blank, preferably radially.

14. Cross rolling method according to claim 12, wherein the contour has elevations and/or cavities as geometry or geometries in the tool surface, wherein in particular the contour form elevations and/or cavities with respect to the central surface spacing of the cross rolling tools with respect to the main axis of rotation of the component blank.

15. Cross rolling method according to claim 12, wherein the contour has periodically repeating geometries over the rolling length of the cross rolling tool.

16-25 (canceled)

Description

[0037] In the figures described below, two possible component geometries which can be produced by the novel cross rolling method are illustrated by way of example. In the figures:

[0038] FIG. 1 shows, schematically, a component produced by a conventional cross rolling method in a simplified illustration, only one (upper) side with respect to the axis of rotation of the rotationally symmetrical component being illustrated,

[0039] FIG. 2 shows, schematically, a component according to the invention according to a first exemplary embodiment of the invention, and

[0040] FIG. 3 shows, schematically, a component according to the invention according to a second exemplary embodiment of the invention in two illustrations which are not true to scale in relation to each other.

[0041] The component 10 illustrated in FIG. 1 represents a component 10 produced by means of a conventional cross rolling method, which is formed rotationally symmetrically with respect to its axis of rotation R.sub.10 (only one (upper) side with respect to the axis of rotation R.sub.10 of the component 10 is illustrated).

[0042] In FIG. 2, in simplified form, a component 1 according to the invention according to a first exemplary embodiment of the invention is illustrated. In the areas A and C illustrated with respect to the longitudinal or main axis of rotation R.sub.1 of the component 1, the component 1 has been shaped in a conventional way and, in these areas A, C, is formed rotationally symmetrically. However, in the central area B, the component 1 according to the invention has been shaped correspondingly in such a way that this area B is formed non-rotationally symmetrically and non-cyclically symmetrically with respect to the main axis of rotation R.sub.1 of the component 1. In particular, in the area B the axis (of symmetry) R.sub.B of this region B has been moved away or offset out of the main axis of rotation R.sub.1 of the component 1, and thus the mass center of gravity in the area B is arranged to be displaced downward from the main axis of rotation R.sub.1 in FIG. 2. The configuration according to FIG. 2 may be used, for example, in the area of crankshafts.

[0043] The component 1 illustrated in FIG. 2 has been produced by a method according to the invention with tools according to the invention, as described above; for example, by providing mutually opposite cavities (tool at the bottom) and elevations (tool at the top), so that, with appropriately oppositely acting tools, the material is forced and flows into the lower area of the component 1 shown in FIG. 2.

[0044] FIG. 3 shows a further component 2 according to the invention according to a second exemplary embodiment of the present invention. As illustrated in FIG. 3a, this component 2 also has areas A, C which are symmetrical with respect to its longitudinal or main axis of rotation R.sub.2, which are formed rotationally symmetrically in particular with respect to the main axis of rotation R.sub.2. Likewise, the component 2 according to FIG. 3 also has an area B which is non-rotationally symmetrical and non-cyclically symmetrical with respect to the main axis of rotation R.sub.2. In this area B, not only is the mass center of gravity displaced with respect to the main axis of rotation R.sub.2 (upward here). In addition, the geometry of the component 2 in this area B is non-round (egg-shaped here, for example), as is illustrated in FIG. 3b, which shows a section—not true to scale—through the component 2 in FIG. 3a. Such a configuration can be used, for example, in the area of camshafts.

[0045] The component 2 illustrated in FIG. 3 has also been produced by a method according to the invention with tools according to the invention, as described above. Here, the areas O, U bulged upward and downward in FIG. 3b of the “egg-shaped” cross-sectional geometry have been produced, for example, by providing mutually opposite cavity (tool at the top) and elevation (tool at the bottom) in the appropriate revolving partial sections of the tools or tool surfaces, so that, with appropriately oppositely acting tools, the material is forced and flows into the upper area O of the component 1 shown in FIG. 3b. The left and right areas L, R of the “egg-shaped” cross-sectional geometry in FIG. 3b have been produced, for example, by providing mutually opposite elevations in the corresponding revolving partial sections of the tools or tools surfaces, so that, with appropriately oppositely acting tools, the material is forced and flows towards each other in the lateral areas L, R of the component 1 shown in FIG. 3b.

[0046] It should be noted that the exemplary configurations illustrated in FIGS. 2 and 3 of components 1, 2 according to the invention are of course not restrictive, and any combination of any desired configurations of corresponding components which have at least one at least partly non-rotationally symmetrical and non-cyclically symmetrical geometry with respect to the main axis of rotation R.sub.1, R.sub.2 is conceivable.

[0047] The invention is consequently not restricted to the present exemplary embodiments if it is supported by the subject matter of the following claims.