A tool holder damped against vibrations having a wide range of frequencies comprises a tool support member provided with tool mounting means. The support member has a recess containing a segmental vibration damping member. The latter includes a plurality of nesting pieces. The meeting faces of the pieces are in frictional contact with each other. At least come of the pieces are spaced from the recess sidewall. Resilient means bear against the pieces, maintaining them wedged together in normally centered position. Displacement of the tool holder, such as occurs during operation of a cutting or other tool mounted thereon, results in a compensating damping movement of one or more of the pieces comprising the segmental damping member. The individual pieces are contoured and dimensioned to make individual ones more easily displaced than others, thereby compensating for vibrations occurring over a wide range of frequencies. This prevents the rhythmic chatter-causing vibration of the assembly.
A damped boring bar assembly for damping the vibrations encountered during the high-speed boring of titanium, zirconium, and their alloys and the like, as well as steel and other metals, especially when the overhang, or ratio of the diameter to depth of the bored hole, is very small. The boring bar assembly has a weighted damper body contained within a hollow elongated case, the tool-holding end of which is closed and incorporates a shaped inner face with a frictional sliding surface. The damper body also has a frictionally slidable element which, with the damper body, holds a resilient element in compression in an internal cavity. The frictionally slidable element has a shaped face having a frictional surface thereon which engages the frictional surface of the inner face of the elongated case during vibration. The damping mechanism can be adjusted to handle different machining conditions.
Disclosed is a boring tool resistant to vibration. There is a boring bar having a central bore at one end and a boring bar head for attachment to the boring bar at the one end. Inserted in the bore is a tuned absorber package for eliminating vibrations in the boring tool. The tuned absorber package is self-contained and is transferable between boring bars. Also disclosed is a method of reducing vibrations in the boring tool.
A tunable toolholder with a dynamic vibration absorber is disclosed wherein an absorber mass is compressed between two elastomer supports utilizing at least one longitudinally movable pressure plate to dynamically tune the toolholder.
The invention relates to the field of toolings for high-accuracy finishing through-holes and non-through-holes, such as for example for calibration, lapping operations. More precisely the invention refers to a tool-holding system for high-accuracy calibration of the type comprising a driving shaft (2) and a driven shaft (3) mutually connected by two cardan joints (5) and that provides an external cylindrical body (6) supported through bearings (8) by said driving shaft (2). The cylindrical body or liner (6) is closed on its bottom side by a driving bush oscillating in a plane perpendicular to the driven shaft rotation axis; said oscillations being compensated by elastic means. Axial compensation means for driven shaft movements are also provided. The liner (6) forms a chamber (7) that is kept full of oil.
