B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
82/27
B23B 31/00 (2006.01) B23B 3/26 (2006.01) B23B 3/30 (2006.01) B23B 29/034 (2006.01) B23Q 39/02 (2006.01) G05B 19/18 (2006.01)
Patent
CA 1046807
APPLICATION FOR CANADIAN PATENT SPECIFICATION ABSTRACT OF THE DISCLOSURE Two rotary toolheads are mounted on diametrically opposed sides of an index table which is rotatable about a vertical Y axis and which supports a fixture carrying a stationary work- piece. Both toolheads are slidably mounted on the bed of the machine for movement along a horizontal Z axis perpendicular to the Y axis. Both toolheads are journalled for rotation about the Z axis and can be simultaneously rotated about the Z axis and moved axially therealong. Two tool slides are slidably mounted on the face of each toolhead for cross-feed movement along an X axis and a U axis, respectively, both of which are perpendicular to the Z axis. The tool slides are moved by DC motors mounted on the corresponding toolhead and mechanically coupled to the tool slides through ball screw mechanisms. The motors rotate with the toolheads and are electrically coupled to the NC controller through slip rings. To machine a cylin- drical surface on the workpiece coaxial with the Z axis, the corresponding toolhead is rotated and simultaneously moved a- long the Z axis while the cutting tool slide remains stationary. To machine a flat surface on the workpiece perpendicular to the - 1 - Z axis, the corresponding toolhead is rotated without movement along the Z axis and the cutting tool slide is moved along its cross-feed axis. If a constant cutting surface speed is de- sired, the rotary speed of the toolhead can be automatically varied by the NC controller in inverse proportion to the vari- ation of the radius of the circular path followed by the cut- ting tool point so as to maintain a constant cutting surface speed in spite of the cross-feed movement. If a constant chip thickness is desired, the cross-feed rate can be varied auto- matically by the NC controller in direct proportion to the vari- ation in the rotary speed of the toolhead to maintain a constant chip thickness in spite of the speed variation of the rotary toolhead. To machine an axially curved surface on the workpiece, the corresponding toolhead is simultaneously rotated and moved along the Z axis, while the cutting tool slide is moved along its cross-feed axis at a feed rate which produces the desired axial curve in conjunction with the Z axis feed rate. An unin- terrupted transition can be made from cutting a flat surface perpendicular to the Z axis to cutting an axially curved sur- face which is tangent to the flat surface. - 2 -
285037
Kielma Ervin J.
Merkel Kenneth J.
Schalk Frank J.
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