US 4,356,669 AGranted

Cam control grinding machine

OwnerNils Hoglundinventor

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Abstract

A grinding apparatus for forming and grinding complex curved surfaces such as the peritrochordal bore of rotary a combustion engine, e.g. Wankel engine, having a cam member with a surface corresponding to the surface of the workpiece to be ground, a grinding wheel, a turntable for fixing the workpiece for rotational movement with the cam member, drive elements for rotating the turntable and workpiece against the grinding wheel, a cam follower connected to a device for supporting and moving the grinding wheel in response to cam follower movement as it traces the cam member contour, and a normalty control device for pivoting the grinding wheel support about the axis of rotation of the cam follower to maintain perpendicularity of a plane passing through the axis of the grinding wheel, the cam follower axis, the contact point between the grinding wheel and the work surface, and the contact point between the cam follower and cam member normal to the tangent line of the work surface contour at the contact point between grinding wheel and work surface. The normalty control device in combination with grinder moving device automatically compensates for grinding wheel wear.

A grinding apparatus for grinding a surface on a workpiece comprising:

a cam member having a surface with a changing radius of curvature corresponding to the contour of the surface to be ground on the workpiece;
a means for supporting said cam member;
a turntable on which the workpiece and said means for supporting said cam member are connected;
a means for rotating said turntable;
a stationary base for supporting said turntable and said means for rotating said turntable;
a grinding means whose axis of rotation is parallel to the axis of rotation of said turntable;
a cam follower whose axis of rotation is parallel to the axis of rotation of said turntable;
a cam follower support means for supporting said cam follower;
said cam follower support means linearly movable in response to movement of said cam follower;
a grinder support means for supporting said grinding means;
said grinder support means connected to said cam follower support means;
said grinder means rotatable about the axis of said cam follower;
said grinding means linearly movable in relation to said grinder support means into and away from the axis of said cam follower;
said grinding means linearly movable in relation to said grinder support means parallel to the axis of said cam follower;
a means for biasing said grinder support means such that said cam follower remains in contact with said cam and said grinding means is maintained in machinable contact with the work surface;
a means for rotating said grinder support means about said cam follower axis to continuously maintain a normalty relationship between the tangent to the work surface contour at the point said grinding means contacts the work surface and a plane passing through the axes of said cam follower and said grinding means, said plane also passing through the contact points between said grinding means and the work surface and between said cam member and said cam follower;
a means for linearly moving said grinding means into and away from the axis of said cam follower;
and
a means for linearly moving said grinding means parallel to the axis of said cam follower.

16 more elements

Abstract

Claims15