Device for adjusting the working position of a machine for producing a chamfer

Device for adjusting the working position and orientation of the axis of rotation of a machine producing a chamfer (10) on a rotationally symmetrical part of a hollow workpiece (5), said machine comprising a body (50) provided with adjustable fastening means (51) defining the axis of rotation (12) of the machine, and comprising a part (54) mounted for rotational movability about the axis (12) on the body (50) and carrying the chamfer machining tool, composed of an assembly of annular shape whose inside diameter is greater than the outside diameter of the part of the workpiece to be machined, and which comprises:

• (a) a first ring (15), called the support ring, comprising means (18, 19) for fastening on the hollow workpiece (5) around the part to be machined, and screw adjustment means (25) bearing against the hollow workpiece (5) for the adjustment of the position of the support ring (15) in at least two directions at right angles to the axis of revolution of the part to be machined, as well as at least three adjustable support assemblies (20) regularly distributed on the circumference of the support ring (15),
• (b) a second ring (16), or orientation ring, having a plane face and carried by the support ring (15) with the aid of support assemblies (20) of adjustable length enabling the position of the orientation ring (16) to be adjusted in the direction of the axis of revolution of the part to be machined and enabling its orientation to be adjusted in relation to the cross-sectional planes of the part to be machined which are perpendicular to the axis of revolution, and
• (c) a third ring (17), or adjustment ring, carried by the orientation ring (16) and provided with means (40) for its displacement in at least two directions of the plane of the orientation ring, and with means (42) for its fastening on the orientation ring (16), the adjustment ring (17) additionally comprising, on at least a part (17a) of its plane face opposite the plane of the orientation ring (16) and on at least a part (17b) of its side surface, zones machined to constitute two reference surfaces of the adjustment of the chamfering machine.