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This paper attempts to detect and predict the preload loss and life time of the ball screw demands in the machine tool industry. Loss of preload leads to a lower natural frequency and the onset of the nonlinear spring characteristics of the ball screw. Such problems result in rapid downtime in the manufacturing process and gradually undetermined positioning errors. In this paper the preload features...
The current light-emitting diodes (LED) flip chip has the advantage of high speed electricity, small volume, good heat dissipation and high I/O density for modern display technology. Thermosonic bonding system for LED seeking to feature with lower temperature and lower pressure for industrial application is overwhelming. Development of such potential precision, fine pitch and with shorten ultrasonic...
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