Tool clamping insert and tool clamping device
AssigneeESA Eppinger GmbH
InventorManfred Neumeier
Life of this patent
Estimating the term…
Abstract
A tool clamping insert has a tool holder for receiving a tool shank. The tool holder hole is nominally smaller than the tool shank to be therein but upon heating of the insert expands to a size permitting insertion of the tool shank and, upon cooling, shrink fitting therein. The insert has an external clamping surface and is positioned in a clamping unit. The clamping surface and the tool holder hole are each configured with diameters, external and internal respectively, that change along the progression of their axial lengths.
Claims16
A tool clamping insert for stationary or rotating tools for use in a tool carrier having a clamping-insert receiving recess (2) with an internal clamping surface (3) encircling an axis and tapering inwardly toward said axis in a direction from a tool entry front side (17) toward a rear side,
- said insert comprising a clamping insert body (8) with a co-axial centering pivoting (9) provided thereon and adapted to be inserted into said clamping-insert receiving recess (2), said centering pivot (9) having an external clamping surface (10) with nominal dimensions of specified tolerances to engage said internal clamping surface in a close fit between said two surfaces when said centering pivot is received in said clamping-insert receiving recess,
- said clamping insert body further comprising a tool holder hole (16) which is coaxial to the centering pivot and extends from said front side into the centering pivot over at least a portion of the axial length of the centering pivot over at least a portion of the axial length of the centering pivot, said tool holder hole being configured to receive a tool shank (18) for clamping said tool shank in a shrink fit,
- wherein, in the absence of a tool shank shrink-fitted into the tool holder hole of the clamping insert body, said external clamping surface (10), at least in an area of the clamping pivot, has outer dimensions that are smaller than said nominal dimensions, and the external clamping surface (10) and said tool holder hole (16) are configured with external and internal diameters, respectively, that change along the progression of their axial length, the course of said change of said diameters across the axial length being dimensioned in such a manner that a dimensional deformation of the external clamping surface occurring upon the tool shank being shrink-fitted into the tool holder hole, will be compensated, thereby bringing the dimensions of the external surface of the centering pivot with said tool shank shrink-fitted into the tool holder hole, to said nominal dimensions (27), within said specified tolerances.
A tool clamping device for a stationary or rotating tool (19) that is shrink-fitted into a tool clamping insert (7), comprising a tool clamping insert (7) and a tool clamping-insert receiving recess (2) on a tool carrier (1) in which said tool clamping insert (7) comprises a clamping insert body (8) upon which a centering pivot (9) is provided and which contains a tool holder hole (16) which is coaxial to the centering pivot and extends from a tool entry front side (17) of the clamping insert body and extends into the centering pivot over at least a portion of its axial length and into which the shank (18) of a tool (19) can be clamped in a shrink fit;
- said tool carrier (1) having an internal clamping surface (3), disposed on the clamping-insert receiving recess (2) and said centering pivot (9) of the tool clamping insert (7) having an external clamping surface (10) shaped to correspond to the internal clamping surface, the two clamping surfaces (3, 10) closely fitting one another to mutually clamp one another when the centering pivot has been inserted into the clamping insert receiving recess, and
- wherein, in the absence of a tool shank shrink-fitted into the tool holder hole of the clamping insert body, said external clamping surface (10), at least in an area of the clamping pivot, has outer dimensions that are smaller than nominal dimensions, specified following said tool shank being shrink-fitted into said tool holder hole and the external clamping surface and said tool holder hole (16) are configured with external and internal diameters, respectively, that change along the progression of their axial length, the course of said change of said diameters across the axial length being dimensioned in such a manner that a dimensional deformation of the external clamping surface occurring upon the tool shank being shrink-fitted into the tool holder hole, will be compensated, thereby bringing the dimensions of the external surface of the centering pivot with said tool shank shrunk into the tool holder hole, to said nominal dimensions (27), within specified tolerances.
Dependencies are inferred from the claim text.