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Study on the Cooling Performance with Various Coolants of a Ball Screw
Z. Z. Xu,김수상(S. S. Kim),윤기백(G. B. Yun),이인범(Y. B. Lee),류성기(S. K. Lyu) 한국정밀공학회 2012 한국정밀공학회 학술발표대회 논문집 Vol.2012 No.5월
The demand for higher productivity and tight part tolerances requires machine tools to have faster and more accurate feed drive system. As tried and tested technology, ball screw drive systems are still used in majority of machine tools due to their low cost and high stiffness. A high speed ball screw system generates more heat naturally and resultant more thermal expansion, which adversely affects the accuracy of positioning. Therefore, a center hole cooling system was set in ball screw shaft in this paper to dominate the thermal error and achieve temperature equilibrium faster. With the aim to achieve temperature equilibrium faster on the ball screw system to improve the positioning error, a simple structure and low-cost air cooling system was set in the ball screw shaft. The main idea of the air cooling method is that through ball screw center hole air injection to obtain more convection heat loss, so the heat gain-loss balance will be achieve faster which produces a position error directly. In this paper, a liquid/air-cooling system was set in a bulk production center hole ball screw drive system to achieve cooling effect. Circulation and forced cooling methods were employed to perform ball screw shaft cooling to guarantee the positioning error.