Roll body for a hydrostatic rolling tool and hydrostatic rolling tool with the roll body

Patent metadata

Field	Value
Publication number	US-11207720-B2
Application number	US-201916973310-A
Country	US
Kind code	B2
Filing date	May 9, 2019
Priority date	Jun 19, 2018
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

A roll body for a hydrostatic rolling tool includes a center, an axis of rotation running through the center, and a machining zone for rolling a workpiece. The roll body is rotatable about the axis of rotation and the machining zone has a working profile line formed in a cross-section of the roll body. The working profile line has a first working arc extending around a first machining center and a second working arc extending around a second machining center. The first machining center is arranged offset to the center, and the second machining center is arranged offset to the center and offset to the first machining center. In an example embodiment, the roll body has a parallel to the axis of rotation, the first machining center lies in the cross-section on the parallel, and the second machining center lies in the cross-section on the parallel.

First claim

The invention claimed is:

1. A roll body for a hydrostatic rolling tool, comprising:
a center;
an axis of rotation running through the center;
a machining zone for rolling a workpiece, wherein:
the roll body is rotatable about the axis of rotation;
the machining zone comprises a working profile line formed in a cross-section of the roll body;
the working profile line comprises:
a first working arc extending around a first machining center; and
a second working arc extending around a second machining center;

the first machining center is arranged offset to the center; and
the second machining center is arranged offset to the center and offset to the first machining center.

2. The roll body of claim 1 , further comprising a parallel to the axis of rotation, wherein:
the first machining center lies on the parallel in the cross-section; and
the second machining center lies on the parallel in the cross-section.

3. The roll body of claim 1 , further comprising a central axis running through the center and perpendicular to the axis of rotation, wherein the central axis forms an axis of symmetry for the first working arc and the second working arc.

4. The roll body of claim 1 , wherein the first working arc and the second working arc intersect in the cross-section to form a tip.

5. The roll body of claim 1 , wherein:
the working profile line comprises a line section comprising a first end and a second end;
the first working arc opens into the first end; and
the second working arc opens into the second end.

6. The roll body of claim 1 further comprising a retaining area for holding the roll body on the hydrostatic rolling tool, the retaining area comprising:
a first retaining center lying on the axis of rotation;
a first retaining profile line comprising a first retaining circular arc extending around the first retaining center in the cross-section;
a second retaining center lying on the axis of rotation; and
a second retaining profile line comprising a second retaining circular arc extending around the second retaining center in the cross-section.

7. The roll body of claim 1 further comprising a retaining area for holding the roll body on the hydrostatic rolling tool, the retaining area comprising:
a first retaining profile line comprising:
a first retaining circle arc or a first oval curve, the first retaining circle arc or the first oval curve comprising a first support center offset relative to the axis of rotation; and
a second retaining circle arc or a second oval curve, the second retaining circle arc or the second oval curve comprising a second support center offset relative to the axis of rotation and to the first support center; and

a second retaining profile line comprising:
a third retaining circle arc or a third oval curve, the third retaining circle arc or the third oval curve comprising a third support center offset relative to the axis of rotation; and
a fourth retaining circle arc or a fourth oval curve, the fourth retaining circle arc or the fourth oval curve comprising a fourth support center offset relative to the axis of rotation and to the third support center.

8. A hydrostatic rolling tool comprising the roll body of claim 1 arranged for rolling the workpiece.

9. The hydrostatic rolling tool of claim 8 further comprising a tool head, wherein:
the tool head comprises a receptacle; and
the roll body is at least partially disposed in the receptacle.

10. The hydrostatic rolling tool of claim 9 , further comprising a plurality of tool heads arranged with respective roll bodies, the plurality of tool heads arranged about a circumference of the hydrostatic rolling tool or along an axis of the hydrostatic rolling tool such that passive forces from rolling a workpiece are canceled out.

Assignees

• Schaeffler Technologies Ag

Inventors

• Geschwindner Peter

Classifications

• B24B39/003

  the working tool being composed of a plurality of working rolls or balls · CPC title

• B21D13/045

  the corrugations being parallel to the feeding movement · CPC title

• B23P19/025

  For detaching only · CPC title

• B23P9/02

  Treating or finishing by applying pressure, e.g. knurling (B23P9/04 takes precedence) · CPC title

• B21H7/185 Primary

  Filet rolling, e.g. of crankshafts · CPC title