Abstract:
A tool for drilling spherical inner surfaces consists of a basic body (4) which rotates about its longitudinal axis during the rough-drilling operation. A swivelling housing (7) is mounted in the basic body (4) on a swivel pin (8) on which it swivels about an axis at right angles to the longitudinal axis. The swivelling movement is produced by means of rods (11, 15) in the tool. A cutting tool holder (35) can be displaced longitudinally in the swivelling housing (7) perpendicular to the swivel pin (8) and has shoulder surfaces which abut on a wedge-shaped surface of the swivel pin and a shaft which passes through the swivel pin (8). The swivel pin (8) can be pushed longitudinally by means of a pressure spring (44) and an adjusting screw toward the cutting tool holder (46) to adjust the radial distance of the cutting tool from the swivel pin (8).
Abstract:
A lathe for machining spherical and non-spherical surfaces without using a combination of several translational movements of the tool holder assembly is disclosed. The lathe mainly comprises three controlled axes of movement. A tool holder assembly (2) is rotatably mounted under the horizontal spindle axis (HB) about a vertical axis (V) that is perpendicular to and intersects the spindle axis (HB). The spindle (10) may be slidably mounted along its axis (HB). The tool holder carriage (4) is also horizontally slidable on the rotary plate (3) in a direction (T) that intersects the vertical axis (V). The lathe is useful for all turning operations.
Abstract:
The invention concerns a method of producing concave, self-contained bearing surfaces, which are at least part of universal ball joints extending over the ball equator, by machining depressions pre-formed in workpieces by means of a tool having a cutting edge rotating about a rotational axis of said tool, the trajectory having a diameter which is equal to the length of a chord extending to the lowest point of the bearing surface. The cutting movement is composed of the rotary movement of the tool cutting edge and a rotating relative movement between the workpiece and tool about a vertical axis through the centre point of the ball. The feed movement is a relative movement of the tool to the workpiece along the axis of rotation of the tool inclined at the same angle of inclination relative to the vertical axis as the chord to the ball equator. In order to decrease production times and increase the dimensional accuracy of the bearing surface, the invention proposes that the chord (S) originates from the ball equator (A) and the depressed areas on both sides of the ball equator (A) be machined with two separate feed movements. The invention further concerns a bearing surface as a product of this method.