Abrading – Abrading process – Cam
Patent
1997-01-23
1999-05-04
Morgan, Eileen P.
Abrading
Abrading process
Cam
451242, 451246, 451251, B24B 100
Patent
active
058997970
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method and an apparatus for grinding cams of a camshaft, which cams comprise concave sides.
A method for grinding cams is described in DE 41 37 924 C1. In this method, a cam is initially rough-ground in a first step from an untreated configuration to an intermediate configuration with a first, large grinding disc. Subsequently, in a plunge-cut grinding method, a modified intermediate configuration, corresponding to the concave sides, is produced by a second grinding disc of smaller diameter. The cam is then finish-ground with the same grinding disc and thereby brought to its final configuration. The use of a small grinding disc, which is wider than the cam, to produce the modified intermediate configuration means that optimum cooling cannot occur because the grinding disc is engaged in the whole three-dimensional region of the concave side and, hence, in the grinding zone.
SUMMARY OF THE INVENTION
The basic object of the invention is to develop further a method and an apparatus of the type presumed to be known, so that an optimum grinding operation with respect to grinding disc loading and cooling is possible, and so that a modified intermediate configuration with as uniform a dimension as possible for the finish-grinding of the hollow side or respectively of the surface of the cam can be produced.
Briefly stated, the present invention provides a method for grinding a cam of a camshaft, wherein the cam has a concave side defined by a concavity radius and a cam width. The method comprises the following steps. Providing a first grinding disc having a first diameter for rough grinding, a second grinding disc having a second diameter for finish-grinding the cam, and a third grinding disc having a third diameter smaller than the first diameter, greater than the second diameter and equal to substantially twice the concavity radius, the third grinding disc having a width narrower than the cam width. Rough grinding a cam body of the cam from an untreated configuration using the first grinding disc to an intermediate configuration which substantially lacks a concavity conforming to the concave side of the cam. Rough grinding the cam body to a modified intermediate configuration using the third grinding disc, wherein the modified intermediate configuration defines the concave side of the cam, by advancing the third grinding disc relative to the cam body in a longitudinal direction corresponding to a shaft axis of the cam body with the third grinding disc set at a depth substantially corresponding to a depth of the concavity. And finish grinding the cam body using the second grinding disc.
In accordance with the above and other objects of the invention, there is provided a grinding machine for grinding a cam on a camshaft wherein the cam has a concave side defined by a concavity radius and a cam width. The grinding machine comprises a bed, structure for supporting the camshaft on the bed, a carriage displaceably mounted on the bed to permit movement relative to the camshaft in a radial direction of the camshaft, and first and second grinding spindles respectively having a rough-grinding disc and a finish-grinding disc. A headstock has the first and second grinding spindles mounted therein and the first and second grinding spindles respectively have first and second spindle axes aligned in one of a first manner in which the first and second spindle axes intersect each other at an angle and a second manner in which the first and second spindle axes extend parallel to each other. The headstock is mounted on the carriage pivotable about a headstock axis displaced from and extending transversely relative to a camshaft axis of the camshaft. The second grinding spindle has a third grinding disc disposed adjacent the finish-grinding disc. The rough-grinding disc has a first diameter for rough grinding, the finish-grinding disc has a second diameter for finish-grinding the cam, and the third grinding disc has a third diameter smaller than the first diameter, greater t
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patent: 2209538 (1940-07-01), Rabe
patent: 5355633 (1994-10-01), Ishikawa et al.
patent: 5392566 (1995-02-01), Wedeniwski
patent: 5655952 (1997-08-01), Schunn et al.
patent: 5697831 (1997-12-01), Reichel
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