PCB using carbide drill holes machining tool with spiral groove is a complex shape

PCB

Through the stress controlled cyclic triaxial tests of Zhanjiang steel sea beach, sea product muddy soil in plain area of earthquake subsidence characteristics, fully considering the influence of soil confining pressure and consolidation ratio and cyclic stress ratio of the size of residual strain in, get the residual strain of soft clay with vibration frequency, confining pressure and consolidation ratio and cyclic stress ratio and change the rules.

Results found coupling effects of different factors, the development of residual strain mainly for the attenuation curve and failure type curve can be respectively with logarithmic curve model and index curve model to predict, the regional earthquake construction provides a valuable reference.
PCB using carbide drill holes machining tool with spiral groove is a complex shape, from the traditional Hemp flowers derived from drilling. The structural parameters of the micro drilling are closely related to the cutting performance of the cutting edge, and the interaction and mutual influence of these parameters are interrelated.

The by defining the rotation matrix established global coordinates of micro drill flank mathematical model, the mathematical expression of the vector deduced the corresponding chisel edge angle and cutting edge, quantitative analysis of the structural parameters affect the cutting performance, draw relevant conclusions, which for the micro drilling engineering to provide a theoretical basis for design.
In recent years, the study on the disaster of the theory and methods of anthropology has become more and more important. Anthropology as three factors: the social science will be a disaster in the intersection of the environmental, biological and social culture into the category of thinking, and the formation of ‘Archaeology and history’ and ‘political ecology, social culture and behavior’ and ‘application and practice of’ several paradigms in the study.

These paradigms are related to each other, and have drawn the experience of disaster research in other disciplines, and have made a unique contribution to the disaster research in the view of the whole field of Anthropology and the method of the micro ethnographic fieldwork.

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