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单工步与三工步无飞边冲孔工艺的对比研究
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作者 李建华 范为福 詹晋浩 《锻压技术》 CAS CSCD 北大核心 2002年第4期29-30,64,共3页
研究了一种单工步无飞边冲孔工艺 ,对该工艺与三工步无飞边冲孔工艺进行了对比研究 ,其模具结构简单 ,操作方便 ,制造精度及费用低 ,孔剪切口光洁剪切带长度达到材料厚度的80 % ,提高了孔的尺寸及形位精度 ,在工程生产中具有很高的实际... 研究了一种单工步无飞边冲孔工艺 ,对该工艺与三工步无飞边冲孔工艺进行了对比研究 ,其模具结构简单 ,操作方便 ,制造精度及费用低 ,孔剪切口光洁剪切带长度达到材料厚度的80 % ,提高了孔的尺寸及形位精度 ,在工程生产中具有很高的实际应用价值。 展开更多
关键词 三工步 飞边 冲孔
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Scientific and technological progress and innovation of Three Gorges Project
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作者 Zhang Chaoran Sun Zhiyu 《Engineering Sciences》 EI 2011年第3期37-41,共5页
In the design,construction and operation periods of the Three Gorges Project (TGP),great challenges have been met in different fields such as water resources and hydropower project construction,electromechanical equip... In the design,construction and operation periods of the Three Gorges Project (TGP),great challenges have been met in different fields such as water resources and hydropower project construction,electromechanical equipment manufacture and ecological environment protection.In view of the key techniques and difficulties in the construction period,scientific and technological breakthroughs have been made by the experts and scholars of various fields and a series of innovative achievements are gained,which make the scientific and technological levels in relevant fields improved.Some major innovative achievements in the construction and operation of TGP are enumerated,which are significant for the hydropower project construction and clean energy development in the future in China. 展开更多
关键词 Three Gorges Project scientific and technological innovation ecological environment protection
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