Method and device for non-circular grinding of cam shapes with concave flanks
AssigneeErwin Junker Maschinenfabrik GmbH
InventorGeorge Himmelsbach
Life of this patent
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Abstract
A method and an apparatus are proposed for grinding cams having concave flanks on a camshaft, using a grinding wheel of relatively small diameter, which is used at least for finish-grinding. The axis of the grinding wheel runs at an angle to the camshaft longitudinal axis, and the grinding wheel is aligned at the same angle. In order to achieve a satisfactory running surface, the grinding wheel is tracked along an advance axis running perpendicular to the infeed axis, specifically as a function of the rotational position of the camshaft and of the positioning on the infeed axis.
Claims19
A method of grinding a cam having a concave flank on a camshaft, comprising:
- providing a grinding wheel with a grinding zone for finish-grinding of the cam;
- supporting said grinding wheel by a grinding spindle aligned along a spindle axis;
- aligning said spindle axis at a predetermined angle of about 10° to 30° relative to a longitudinal axis of the camshaft, said grinding zone of said grinding wheel being defined by a conical outer surface of said grinding wheel which has been dressed relative to said spindle angle at a grinding zone angle which is substantially equivalent to said predetermined angle;
- and
- carrying out grinding operations on the camshaft by tracking the grinding spindle, along with the grinding wheel, in the direction of a vertical advance axis running perpendicular to an infeed axis and a longitudinal positioning axis of the grinding spindle, such that the grinding zone of the grinding wheel is maintained at a same position on a generatrix of the grinding wheel.
An apparatus for grinding a cam having concave flanks on a camshaft, the apparatus comprising:
- a mechanism for rotatably supporting the camshaft for rotation about a rotational axis of the camshaft;
- a grinding wheel with a grinding zone for finish-grinding of the cam;
- a grinding spindle aligned along a spindle axis for supporting the grinding wheel, said spindle axis being arranged at a predetermined angle of about 10° to 30° relative to the rotational axis of the camshaft, said grinding zone of said grinding wheel being defined by a conical outer surface of said grinding wheel which has been dressed relative to said spindle angle at a grinding zone angle which is substantially equivalent to said predetermined angle;
- and
- a mechanism for producing coordinated movement of the grinding wheel along an infeed axis and an advance axis running perpendicular thereto in relation to the axis rotation of the camshaft, the grinding wheel being tracked such that the grinding zone is maintained at a same position on a generatrix of the grinding wheel.
Dependencies are inferred from the claim text.