Dead center for machine tools
OwnerRandall Andronicainventor
Life of this patent
Estimating the term…
Abstract
A dead center work support for a machine tool comprises a plurality, preferably at least three concentrically rounded raised radial projections defining the bearing surface of the dead center. The radial projections may be disposed either on the external or internal surfaces, which can be cylindrical, conical, or spherical. Between bearing surfaces a cut out section can be provided so that a cutting tool can run into the void to perform facing and turning of a center supported workpiece. Preferred embodiments comprise provisions for supplying lubricating oil through the tool to achieve continuous lubrication of the interface between the work and the center. The bearing surfaces may comprise hard, high-temperature resistant material, such as tungsten carbide, or ceramic.
Claims18
In a machine tool, a dead center support for engaging a rotary workpiece to be machined in which the engaged dead center support and workpiece have complementary male and female circular surfaces and at least the engaged surface of the workpiece is substantially conical and concentric with the axis of rotation thereof, the invention comprising:
- a plurality of at least three circumferentially spaced elongated radially converging, bearing ribs, the bearing surfaces of which are concentric with the axis of rotation and adapted to engage the complementary contoured circular surface of the workpiece, and
- wherein the bearing surfaces of the ribs are transversely rounded to match the curvature of the conical surface of the workpiece.
In a machine tool, a dead center support for engaging a rotary workpiece to be machined in which the engaged dead center support and workpiece have complementary male and female circular surfaces and at least the engaged surface of the workpiece is substantially conical and concentric with the axis of rotation thereof, the invention comprising:
- a plurality of at least three circumferentially spaced elongated radially converging, bearing ribs, the bearing surfaces of which are concentric with the axis of rotation and adapted to engage the complementary contoured circular surface of the workpiece, and
- wherein the bearing surfaces of the ribs are transversely rounded to match the curvature of the conical surface of the workpiece, and
- wherein the bearing ribs are cylindrical rolling ribs rotatably journalled in the dead center.
In a machine tool, a dead center support for engaging a rotary workpiece to be machined in which the engaged dead center support and workpiece have complementary male and female circular surfaces and at least the engaged surface of the workpiece is substantially conical and concentric with the axis of rotation thereof, the invention comprising:
- a plurality of at least three circumferentially spaced elongated radially converging, bearing ribs, the bearing surfaces of which are concentric with the axis of rotation and adapted to engage the complementary contoured circular surface of the workpiece, and
- wherein the bearing surfaces of the ribs movably contact the conical surface of the rotating workpiece.
Dependencies are inferred from the claim text.