Honing tool holder with a feed system powered by through-the-spindle coolant pressure and actuated by spindle rotation
View Patent ↗A honing tool holder utilizes pressure of a through-the-spindle coolant delivery system for automatically feeding the honing elements or stones of an attached honing tool when in the bore of a work piece, and for automatically stopping the feeding when a particular condition such as a bore size, is reached, so as to enable use of an in-process adjustable feed honing tool in a machine tool, machining center, or the like, lacking a feed mechanism or system but including a coolant delivery system. The holder can also include apparatus to automatically prevent feed past a limit. Both the feed force and feed limit can be adjustable, at least the latter by simple movements of the tool holder by the machine tool.
1. A honing tool holder, comprising
a body having a mounting element for cooperatively mounting the tool holder on a spindle of a machine tool for rotation therewith about a rotational axis therethrough and for receiving a flow of pressurized fluid from the spindle, and a tool holding element opposite the mounting element configured and operable for cooperatively holding a honing tool for rotation about the rotational axis; and
a feed system carried on the body, configured to connect to a feed element of the honing tool held by the tool holding element, the feed system including a biasing element configured and operable to receive the pressurized fluid from the spindle and, in a first state to use the pressurized fluid to hold the feed element in a retracted position, then upon occurrence of a predetermined condition, to use the fluid to automatically direct a feed force against the feed element to urge honing elements of the tool radially outwardly relative to the tool, and apparatus configured and operable to automatically prevent radial movement of the feed element of the honing tool past a limit, the feed system including a release mechanism having a release element disposed within a radial passage within the body and biased by a spring toward a first position eccentrically adjacent to an axial center of the body, and movable in opposition to the spring by a centrifugal force generated by the rotation of the tool holder about the axial center, to a second position radially outwardly of the first position to connect the biasing element to a port for receiving the pressurized fluid.
2. The honing tool holder of claim 1 , further comprising a signal device automatically operable to output a signal when the feed element is at the limit.
3. The honing tool holder of claim 1 , wherein the feed system further comprises an element configured and operable for adjusting the limit.
4. The honing tool holder of claim 3 , wherein the element configured and operable for adjusting the limit comprises an external element on the body movable relative thereto.
5. The honing tool holder of claim 4 , wherein the external element is configured to be moved by movement of the tool holder relative to, and in contact with, a fixed object.
6. The honing tool holder of claim 5 , wherein the movement of the tool holder relative to the fixed object comprises rotation of the tool holder.
7. A honing tool holder, comprising
a body having a mounting element for cooperatively mounting the tool holder on a spindle of a machine tool for rotation therewith about a rotational axis therethrough and for receiving a flow of a pressurized fluid from the spindle, and a tool holding element opposite the mounting element configured and operable for cooperatively holding a honing tool for rotation about the rotational axis; and
a feed system carried on the body, configured to connect to a feed element of the honing tool held by the tool holding element, the feed system including a piston assembly configured and operable for receiving the pressurized fluid and responsive to a predetermined condition indicative of the honing tool being located in a bore of a work piece, to exert a feed force against the feed element to urge honing elements of the tool radially outwardly relative to the tool, and apparatus configured and operable to automatically prevent operation of the piston assembly past a limit, the predetermined condition comprising rotation of the tool holder and the feed system comprising a release mechanism including a release element disposed within a radial passage within the body and biased toward a first position eccentrically adjacent to an axial center of the body, and movable in opposition to the biasing element by a centrifugal force generated by the rotation of the tool holder, to a second position radially outwardly of the first position to connect a cylinder containing the piston assembly with a port for receiving the pressurized fluid.
8. The honing tool holder of claim 7 , wherein the feed system further comprises a release mechanism configured and operable to automatically engage an element of the feed system to prevent the operation of the piston assembly until the predetermined condition is present.
9. The honing tool holder of claim 7 , further comprising an element configured and operable for adjusting the limit.
10. The honing tool holder of claim 9 , wherein the element configured and operable for adjusting the limit comprises an external element on the body movable relative thereto.
11. The honing tool holder of claim 7 , further comprising a signal device automatically operable to output a signal when the feed element is at the limit.