| 摘要 |
1,226,101. Lathes, swashplate motors. NATIONAL RESEARCH DEVELOPMENT CORP. 15 March, 1968 [28 March, 1967], No. 14110/67. Headings B3B and B3T. A machine tool comprises a rotary work chuck 47, mounted on a spindle 45, carried in a carriage 33, transversely movable across the diameter of a cylinder 13 which is rotatable in a housing 5, axially slidable in a casing 1. Housing 5 is movable in the casing by double-acting pistons 9, and its position and velocity is monitored by a linear transducer scanned by a pick-up head. Cylinder 13 is rotated by a motor 15, which drives a spur gear 19, meshing with a gear ring 21 on the housing 5. The angular orientation and rate of movement of housing 5 is monitored by an optical grating 23, which co-operates with a reading head 25. Carriage 33 is adapted to be moved across the diameter of cylinder 13 on a slideway 65, by double-acting pistons 37, and its position is monitored by an optical grating 67 which co-operates with a reading head 69. Spindle 45 is rotatable by a swash plate motor 57, or multilobe ball motor 60. The position and velocity of spindle 45 is monitored by a rotary transducer and reading head. Six tool holders 70 are disposed at different angular orientations around the axis of cylinder 13, four of which are turning tools, one is a milling attachment, and one is a drilling attachment. In operation, motor 15 rotates cylinder 13 to align the diametrical axis of the cylinder with the tool to be used, as indicated by head 25. Cylinders 7 displace housing 5 axially and motor 57 or motor 60 is used to rotate the workpiece 71. Cylinders 37 are actuated so as to move the workpiece radially towards the selected tool. By controlling carriage 33 and housing 5 in a continuous manner, the workpiece centre can be constrained to describe chordal movement. During chordal traversing a further axis has to be brought into operation to offset the induced rotational movement of the workpiece, and this is achieved by controlling the ball motor incorporated in the headstock drive. The three control movements may be used in a numerical or continuous path control. The linear and rotary transducer may be replaced by transducers of the Inductosyn or Helixyn (Registered Trade Marks) mode of operation. |
