Method for producing rotationally symmetrical, undercut contours

Abstract

The invention relates to a method for producing essentially rotationally symmetrical, undercut contours on workpieces (13) that can for example be produced by forging or casting, said workpieces having at least one sub-section (14) to be machined with an essentially symmetrical initial contour. The workpiece (13) is braced by the end that is not to be machined in a recess (11) and when in said recess (11) the sub-section (14) of the workpiece that is to be machined is placed against a tool (12). The tool (12) rotates with a constant or variable speed in relation to the sub-section (14) of the workpiece (13) that is to be machined. An undercut contour is thus produced on the sub-section (14) of the workpiece (13) by machining under an axial pressure.

Description

technical field [0001] The present invention relates to a method for chipless, non-cutting production of a substantially rotationally symmetrical undercut contour on a workpiece, and to workpieces produced by the method. Such undercut contours can be formed in particular on segments of workpieces produced by forging, casting or cutting. Background technique [0002] The methods known in the prior art so far all manufacture rotationally symmetric undercut profiles by cutting, such as cooling channels on a piston of a diesel engine of a commercial vehicle. That is, an initial workpiece manufactured, for example, by forging or casting, is machined by a material removal method such as turning, grinding, or cutting to produce an undercut profile. [0003] The disadvantage of these known methods is, on the one hand, the high level of chipping, especially in the case of the internal contours of mass-produced items such as pistons, which require integral machining, and, on the othe...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of these known methods is on the one hand the high level of chipping, especially in the case of internal contours of mass-produced items such as pistons, which have to be machined in one piece, and on the other hand the concomitant occurrence in conventionally manufactured products Particle interruption of

This interruption results in a structurally weak workpiece, which adversely affects wear resistance, service life, and cost of the final product

Images