關(guān)于錐形輥穿孔機(jī)軋輥轉(zhuǎn)速對(duì)毛管分層缺陷影響的討論

Discussion of Inflaence by Cone Type Piercer Roll Speed on Shell Lamination Defect

摘要: 指出了錐形輥穿孔機(jī)也要和桶形輥穿孔機(jī)一樣,要重視對(duì)穿孔機(jī)軋輥轉(zhuǎn)速的控制。難變形鋼和合金管坯在錐形輥穿孔機(jī)上穿孔,毛管的主要質(zhì)量問(wèn)題也是分層缺陷;降低軋輥轉(zhuǎn)速是消除毛管分層缺陷的關(guān)鍵;只依靠大輾軋角,不能消除某些合金毛管分層缺陷;通常所說(shuō)的斜軋穿孔金屬扭轉(zhuǎn)變形這種“連續(xù)”的不均勻變形,不是毛管分層缺陷產(chǎn)生的原因。

Abstract: It is pointed out that like the barrel type piercer process,the control of the cone type piercer roll speed is also very important.The major quality defect as occurring in the cone type piercer process with highdeforming steel and alloy steel is the lamination.The critical measure as taken to eliminate the said defect is to reduce the roll speed.It is emphasized that the lamination defect of certain alloy steel shells can not be eliminated just by "big toe angle",and that the common explanation for the development of the shell lamination is not true that the "continuous" uneven metal deformation,i.e.,the rotary piercing-caused torsional deformation of the metal is responsible for the said defect.