| 摘要 |
PROBLEM TO BE SOLVED: To provide a numerical control device with improved precision of a screw cutting starting position when override is added to main shaft rotation speed. SOLUTION: Speed change quantityΔS is determined as difference between a program command value Sc for main shaft speed and main shaft rotation speed Sov after override is added to main shaft rotation (A2). Follow-up error change quantityΔZ for a feed shaft with the speed change quantityΔS is computed based on the speed change quantityΔS, a pitch command value in screw cutting, and response sensitivity of a servo system (A3). The follow-up error change quantityΔZ is converted into delay time Td for starting move of the feed shaft based on the screw pitch command value in screw cutting (A4). Move of the feed shaft is started with delay for the delay time Td by conversion (A5). Since move starting timing of the feed shaft for screw cutting is thus controlled based on time, not based on a detector signal, correct move starting timing is provided without being affected by resolution of a detector or the like, thereby screw cutting precision is improved. COPYRIGHT: (C)2006,JPO&NCIPI
|
