Abstract

A real time error compensation system was developed to improve the quasistatic volumetric accuracy of a machining center by using sensing, metrology, modeling, and computer control techniques. Including thermal errors, 32 error components are formulated in the time-space domain. Fifteen thermal sensors are used to characterize the temperature field of the machine. A compensation controller based on the IBM/PC has been linked with a CNC controller to compensate for machine errors in real time. The maximum linear displacement error in 4 body diagonals were reduced from 140 ${\mu}m$ to 34.5${\mu}m$ with this compensation system, and the spindle thermal drift in space was reduced from 147.3 ${\mu}m$ to 16.8 ${\mu}m$.

Keywords

• quasistatic volumetric error;
• real time compensation;
• machine accuracy;
• linear displacement error;
• spindle thermal drift

• 준정적체적오차;
• 실시간보정;
• 기계의정확도;
• 선형변위오차;
• 스핀들열변형;