Aiming at machining deeply small holes in TC4 alloy,a series of experiments were carried out on a self-developed multi-axis micro electrical discharge machining(micro-EDM)machine tool.To improve machining efficiency a...Aiming at machining deeply small holes in TC4 alloy,a series of experiments were carried out on a self-developed multi-axis micro electrical discharge machining(micro-EDM)machine tool.To improve machining efficiency and decrease relative wear of electrode in machining deeply small hole in TC4 alloy,many factors in micro-EDM,such as polarity,electrical parameters and supplying ways of working fluid were studied.Experimental results show that positive polarity machining is far superior to negative polarity machining;it is more optimal when open-circuit voltage,pulse width and pulse interval are 130 V,5μs and 15μs respectively on the self developed multi-axis micro-EDM machine tool;when flushing method is applied in micro-EDM,the machining efficiency is higher and relative wear of electrode is smaller.展开更多
企业与金字塔底层(Bottom of the Pyramid,BOP)群体经济关系的建立是开展包容性创新的重要前提。从BOP群体与企业的关系视角出发,认为二者之间存在"结构洞"现象,即政策制度和配套设施短缺导致的"市场洞",融资困难...企业与金字塔底层(Bottom of the Pyramid,BOP)群体经济关系的建立是开展包容性创新的重要前提。从BOP群体与企业的关系视角出发,认为二者之间存在"结构洞"现象,即政策制度和配套设施短缺导致的"市场洞",融资困难、知识和技能不足导致的"资源洞",信息获取、传播和扩散困难导致的"信息洞"。引入小微企业作为第三方,搭建大企业与BOP群体之间的连接桥。提出在包容性创新情境下,利用小微企业的定位优势、资源优势以及协调优势来实现"结构洞"的跨越,并在从企业能力提升和外部环境两方面提出建议。展开更多
基金Project(2006AA04Z323)supported by High-tech Research and Development Program of China。
文摘Aiming at machining deeply small holes in TC4 alloy,a series of experiments were carried out on a self-developed multi-axis micro electrical discharge machining(micro-EDM)machine tool.To improve machining efficiency and decrease relative wear of electrode in machining deeply small hole in TC4 alloy,many factors in micro-EDM,such as polarity,electrical parameters and supplying ways of working fluid were studied.Experimental results show that positive polarity machining is far superior to negative polarity machining;it is more optimal when open-circuit voltage,pulse width and pulse interval are 130 V,5μs and 15μs respectively on the self developed multi-axis micro-EDM machine tool;when flushing method is applied in micro-EDM,the machining efficiency is higher and relative wear of electrode is smaller.
文摘企业与金字塔底层(Bottom of the Pyramid,BOP)群体经济关系的建立是开展包容性创新的重要前提。从BOP群体与企业的关系视角出发,认为二者之间存在"结构洞"现象,即政策制度和配套设施短缺导致的"市场洞",融资困难、知识和技能不足导致的"资源洞",信息获取、传播和扩散困难导致的"信息洞"。引入小微企业作为第三方,搭建大企业与BOP群体之间的连接桥。提出在包容性创新情境下,利用小微企业的定位优势、资源优势以及协调优势来实现"结构洞"的跨越,并在从企业能力提升和外部环境两方面提出建议。
