Worm grinding has been applied to manufacture gears to pursue high accuracy and fine surface finish.When the worm used to grind face gears is manufactured with multi-axis computer numerical control(CNC)machining,the m...Worm grinding has been applied to manufacture gears to pursue high accuracy and fine surface finish.When the worm used to grind face gears is manufactured with multi-axis computer numerical control(CNC)machining,the machining accuracy is usually improved by increasing the number of tool paths with more time cost.Differently,this work proposes a generated method to improve the efficiency by dressing the worm surface with only one path,and a closed-loop manufacturing process is applied to ensure the machining accuracy.According to an advanced geometric analysis,the worm surface is practically approximated as a swept surface generated by a planar curve.Meanwhile,this curve is applied as the profile of a dressing wheel,which is used to dress the worm surface.The practical machining is carried out in a CNC machine tool,which was originally used to grind helical gears.Finally,a closed-loop manufacturing process including machining,measurement,and modification is proposed to compensate the machining errors.The proposed method is validated with simulations and practical experiments.展开更多
请先观察以下两对句子:1)a.Fish abound in this stream.b.This stream abounds in fish.这条小溪有大量的鱼。2)a.A curtain hung over the window.b.The window hung with a curtain.窗户上挂着窗帘。上述每对句子中,上下两句句意相同...请先观察以下两对句子:1)a.Fish abound in this stream.b.This stream abounds in fish.这条小溪有大量的鱼。2)a.A curtain hung over the window.b.The window hung with a curtain.窗户上挂着窗帘。上述每对句子中,上下两句句意相同,相映成趣。它们都可归纳为同一句型结构,即“主语+动词+介词+介词宾语”。在此结构中,主语和介词宾语的位置可以互换,但动词不变,且句意基本相同。Otto展开更多
基金Project(2019 YFB 2004700)supported by the National Key R&D Project of ChinaProject(HTL-O-19 K 02)supported by National Key Laboratory of Science and Technology on Helicopter Transmission,Nanjing University of Aeronautics and Astronautics,China。
文摘Worm grinding has been applied to manufacture gears to pursue high accuracy and fine surface finish.When the worm used to grind face gears is manufactured with multi-axis computer numerical control(CNC)machining,the machining accuracy is usually improved by increasing the number of tool paths with more time cost.Differently,this work proposes a generated method to improve the efficiency by dressing the worm surface with only one path,and a closed-loop manufacturing process is applied to ensure the machining accuracy.According to an advanced geometric analysis,the worm surface is practically approximated as a swept surface generated by a planar curve.Meanwhile,this curve is applied as the profile of a dressing wheel,which is used to dress the worm surface.The practical machining is carried out in a CNC machine tool,which was originally used to grind helical gears.Finally,a closed-loop manufacturing process including machining,measurement,and modification is proposed to compensate the machining errors.The proposed method is validated with simulations and practical experiments.
文摘请先观察以下两对句子:1)a.Fish abound in this stream.b.This stream abounds in fish.这条小溪有大量的鱼。2)a.A curtain hung over the window.b.The window hung with a curtain.窗户上挂着窗帘。上述每对句子中,上下两句句意相同,相映成趣。它们都可归纳为同一句型结构,即“主语+动词+介词+介词宾语”。在此结构中,主语和介词宾语的位置可以互换,但动词不变,且句意基本相同。Otto
