Boring bar actuatable by a centrifugal force
AssigneeSandvik Intellectual Property AB
InventorsVincent Lemoine, Philippe Andre, Jacques Gasthuys, Joly Damien, David Bonhoure
Life of this patent
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Abstract
An actuatable boring bar is configured to place a cutting insert cartridge received onto the boring bar in a cutting position when the centrifugal force generated by the rotation of the boring bar about the rotation axis reaches a centrifugal force threshold and in a non-cutting position when the centrifugal force generated by the rotation of the boring bar about the rotation axis is below the centrifugal force threshold. The boring bar is further configured so that the cutting insert cartridge can be set-up onto the boring bar in the cutting position.
Claims14
A boring bar actuatable by a centrifugal force generated by rotation of the boring bar about a rotation axis, the boring bar comprising:
- a coupling portion arranged to couple the boring bar to a spindle for rotating the boring bar about the rotation axis, the coupling portion including a supply inlet arranged to connect the boring bar to a fluid supplying circuit;
- at least two receiving portions arranged to receive a plurality of cutting insert cartridges distributed on the boring bar about the rotation axis in a cutting position or a non-cutting position;
- an actuating device configured to place the cutting insert cartridges received in the at least two receiving portions either in the cutting position or in the non-cutting position, the actuating device having an actuating inlet and a non-actuating inlet, the actuating device being configured to place the cutting insert cartridges in the non-cutting position when the actuating inlet is supplied with a fluid, and in the cutting position when the non-actuating inlet is supplied with a fluid or when neither the actuating or the non-actuating inlet is supplied with a fluid;
- a lubrication orifice formed in each of the at least two receiving portions, the non-actuating inlet being in fluid connection with each lubrication orifice to discharge the fluid on a cutting insert mounted on each cutting insert cartridge received in the receiving portions;
- and
- a fluid connecting circuit for fluid connection between the supply inlet and either the actuating inlet or the non-actuating inlet, the fluid connecting circuit including a control element movable between a first control position wherein the supply inlet is in fluid connection with the actuating inlet, and a second control position in which the supply inlet is in fluid connection with the non-actuating inlet, wherein the control element is configured to be moved from the first control position to the second control position when the centrifugal force generated by the rotation of the boring bar about the rotation axis reaches a centrifugal force threshold, the control element being configured to be moved from the second control position to the first control position when the centrifugal force generated by the rotation of the boring bar about the rotation axis is below the centrifugal force threshold, wherein the cutting insert cartridges are selectively and automatically placeable in either the non-cutting position or the cutting position depending on the rotation of the boring bar.
Dependencies are inferred from the claim text.