Development of Bearings with Low Temperature （轴承温度较低的发展）.pdfVIP

TECHNICAL REPORT Development of Bearings with Low Temperature-rise and High-speed Performance for Machine Tool Main Spindles K. SUZUKI S. MATSUE K. ICHIKAWA We have developed an angular contact ball bearing and a cylindrical roller bearing which are superior in low temperature-rise and high-speed performance for machine tool main spindles. By optimizing the internal design, temperature rise of both bearings has been reduced to approximately half compared with normal types. These bearings can reduce power consumption for cooling machine tools, which is effective for energy saving. And also, the developed bearings are expected to improve machining accuracy by reducing thermal expansion and improve machining effi ciency by increasing high-speed performance of spindles. Key Words: machine tool, rolling bearing, temperature rise, high-speed capability 1. Foreword 2. Development Target In recent exhibitions, best represented by The Japan The main cause of temperature rise in machine tool International Machine Tool Fair (JIMTOF), many main spindles is the heat generated from rolling bearings machine tools are put out on display which, in addition and the motor. The main spindle undergoes thermal to high accuracy, high speed, high rigidity and high expansion in the axial direction when it heats up which reliability, are also focused on being energy-saving, impacts upon the accuracy of machined workpieces. As environmentally-orientated and user-friendly, with a such, jacket cooling is generally performed to control particular emphasis on being easy for anyone to use. main spindle temperature. Moreover, regarding the moving parts of machine tools Figure 1 shows the percentage that v