外翅片管 meaning in English

externally finned tubes

Various successive partial plastic forming methods for processing groove , including thread rolling , cross rolling and skew rolling , splitting , rolling of spline shaft , split rolling , open - die extrusion of spline shaft / gear , extrusion of internal screwed tooth socket parts with large helical pitch , integral cold forging for slot commutator , extrusion - ploughing for outside fin tube , drawing of tube with spiral internal / external ribs etc . have been introduced briefly
摘要介绍了用于加工槽的各种连续局部塑性成形方法，包括螺纹轧制、横轧与斜轧、分劈、花键轴滚轧、劈分轧制、花键轴齿轮开模挤压、花键套挤压、槽型换向器整体冷锻、外翅片管挤压一犁削、内外螺纹管拉拔等。