Process and Device for Producing Parts, Notably Elongated Revolving Parts, by Machining a Bar Held Fixed in Rotation

A process for producing elongated revolving parts of variable section in a longitudinal direction, comprising machining a bar held fixed in rotation, moving a chassis relatively in relation to said bar, or along a main direction corresponding to a longitudinal direction of the bar, and machining the bar, according to a required longitudinal and circumferential profile, by rotating tools carried by a main plate driven in rotation on the chassis, the tools being connected to the plate by tool supports radially mobile on the plate and, according to the required profile, controlling radial movement of the tool supports according to the axial position of the bar in relation to the chassis and according to the circumferential position of the tools in relation to the bar, and

• driving a secondary plate in rotation coaxially to the main plate to control said radial movement, the secondary plate including means for actuating the tool supports, arranged so that the positions of the tool supports depend on the relative angular position between the main plate and the secondary plate and, to permanently adjust the radial positioning of the tools during the rotation of the main plate, modifying said relative angular position.

A device for producing elongated revolving parts of variable section in the longitudinal direction, by machining of a bar held fixed in rotation, including means for translation movement of a chassis in relation to the bar, or in a main direction corresponding to a longitudinal direction of the bar, a rotating assembly driven in rotation in relation to the chassis around a main axis, the rotating assembly including a main plate and at least two rotating tools supported by mobile supports guided in relation to the main plate in a plane orthogonal to the main axis, and positional control means for the supports to adjust radial positioning of the tools in relation to the main axis, said positional control means of the supports including a secondary plate including means for actuating the tool supports, arranged so that the positions of the tool supports depend on the relative angular position between the main plate and the secondary plate and

• means for controlling said relative angular position arranged so that said relative angular position can be varied during the rotation of the plates.