US 7,028,997 B2Granted

Vibration damping tool

AssigneeMitsubishi Materials Corporation

InventorsHidebumi Takahashi, Yoichi Ishikawa

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Abstract

A vibration damping tool having the following structure is provided. In the vibration damping tool, a hollow portion is formed in the interior of the distal end portion of a tool body and one end of a weight member is connected to the inner wall surface of the distal end side of this hollow portion. A gap created between the outer peripheral surface of the weight member and the inner wall surface of the hollow portion is filled with a visco-elastic body. The one end of the weight member is formed as a narrow diameter shaft portion. The tool body can be divided into two and freely removed from and reattached at a dividing surface located on the base end side of the hollow portion. A hole portion is formed inside the other end of the weight member by hollowing out the interior thereof. Chatter vibration is thus absorbed using a simple structure without there being any effects from heat generated during cutting processing.

Claims13

Dependent claims

A vibration damping tool comprising:

a tool body provided at a distal end portion thereof with processing means for processing a material to be cut, said tool body having a hollow portion formed inside and defined by an inner wall surface, said tool body and said hollow portion extending along a longitudinal axis;
a base plate connected to the tool body at the distal end thereof at a first base plate surface to cover the hollow portion;
a longitudinally-extending weight member comprising a shaft portion integrally connected to and projecting from the first base plate surface of the base plate into the hollow portion, and a weight member portion having a larger diameter than that of the shaft portion and integrally connected to the shaft portion to extend toward yet disposed apart from the inner wall surface on a base end side of said tool body opposite said base plate, with a first gap formed at a radial distance from the longitudinal axis between said inner wall surface of the hollow portion and said weight member portion of said weight member and with a second gap formed at a rectilinear distance along the longitudinal axis between a distal end of the weight member portion and the base end side of said tool body;
and
a visco-elastic body filled only into a portion or all of said first gap,
whereby said weight member and said visco-elastic body constitute a dynamic vibration absorber that damps and absorbs vibration of the tool body and
wherein the visco-elastic body is fabricated from a solid yet elastic material having a Young's modulus of not more than 1000 kPa, a hardness penetration of 20 to 300 based on 1/10 mm, a tensile strength of 1 to 4000 kPa and an elongation of 50 to 800% and
wherein said hollow portion is formed so as to extend from said distal end portion along the longitudinal axis in an axial direction of the tool body with the processing means connected directly to a second base plate surface of the base plate, the second base plate surface being disposed opposite to the first base plate surface.

5 more elements

A vibration damping tool comprising:

a tool body extending along a longitudinal axis and having a longitudinally extending hollow portion formed therein and defined by an inner wall surface;
a base plate provided at a distal end of said tool body and having a first surface and an opposite second surface, the base plate connected directly to the tool body at the first surface for covering the hollow portion;
a processing means that processes a material to be cut, connected directly to the second surface of the base plate;
a longitudinally-extending weight member comprising a shaft portion connected directly to the first surface of the base plate and extending into the hollow portion, and a weight member portion connected directly to said shaft portion to extend along the longitudinal axis toward yet disposed apart from the inner wall surface on a base end side of said tool body opposite said base plate and at a radial distance from the longitudinal axis to form a first gap with the inner wall surface and at a rectilinear distance along the longitudinal axis to form a second gap with the base end side of said tool body;
and
a visco-elastic body disposed partially or entirely in only the first gap and forming an annulus between and in contact with said weight member portion of the weight member and the inner wall surface, the visco-elastic body fabricated from a solid yet elastic material.

3 more elements

Dependencies are inferred from the claim text.