Papers by Author: De Yuan Zhang

Abstract: Based on ultrasonic elliptical vibration cutting (UEVC) model, kinematical formulas of elliptical vibration cutting(EVC) is established, the paper presented relationship of vibration parameters effecting on surface roughness, machining accuracy and machining efficiency, revealed UEVC characteristics of high frequency and small amplitude are more conducive to improve surface roughness, advance EVC machining efficiency. Experiences of cutting the weak rigidity workpiece by the designed adjusting frequency elliptical transducer is proved that compared conventional turning, increasing vibration frequency and decreasing amplitude are result in improve surface roughness, and compared low frequency EVC, decrease amplitude are result in reduce the height of vibration ripples in cutting direction, and advance machining efficiency. So high frequency and small amplitude EVC is more conducive to precision machining and ultra-precision machining.

Abstract: The biomimetic highly-efficient drag reduction surface can be directly replicated by shark skin as biological template, and the pre cured micro-embossing technology is put forward aiming at the thermosetting materials. In the process of bio-replicated forming, the replication precision is one of the most important factors in evaluating the forming effect, and the convincing and reliable assessing method has become an urgent problem to be solved. In this paper, the new evaluating way on the basis of statistical method is put into application, which provide the new idea and method to study the forming quality and effect, and the replication-precision of single scale and regional scales is in comprehensive and deep analysis. In addition, the factors causing forming errors are also illustrated and discussed, which lay the foundation for further research.