The analysis of drill cutting angles is important for the design of high-performance drill geometry. The cutting angles along the cutting edge of a drill are determined by the combination of its flute and flank surfaces. This paper examines the analysis of both flute and flank surface models and the evaluation of drill cutting angles. A new mathematical model for an arbitrary drill flute face is developed by sweeping the polynomial representation of the flute cross-sectional curve along the drill axis, with a helical movement. On the basis of the quadratic flank face, a relationship between the grinding and the geometrical design parameters of the flank face is also established. The vector analysis method is employed for the analysis of the cutting angles for various drill geometries. A comparison of the analytical results with the actual measured cutting angles of an example drill has shown that the average error is less than 5%.
Single-phase AC/DC switching power replaces the low frequency transformer of traditional power source with high frequency transformer, so it has such advantages as light weight, small size, and high power density etc. At the same time, the switching power has higher 8 www.intechopen.com Matlab-Modelling, Programming and Simulations 152
Uses the traditional circuit of Buck to the process of super electric capacity charge, the efficiency is lowly. To solve this problem, this paper makes the improvement base on the Buck circuit, proposes the topological structure of charge base on the synchronized DC/DC technology, uses double closed-loop control current and voltage base on the DSP, realizes charge many super electric capacities through the auto-adapted algorithm. The result indicated the topological structure of charge raises the efficiency; simultaneously the digitization and the intellectualized level are high.
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