草莓视频在线下载

    天津無縫鋼管：隧道鋼花管(guan)(guan)(guan)按(an)生產(chan)方法不(bu)同可(ke)分為(wei)熱軋(ya)(ya)管(guan)(guan)(guan)、冷(leng)軋(ya)(ya)管(guan)(guan)(guan)、冷(leng)拔管(guan)(guan)(guan)、擠壓管(guan)(guan)(guan)等，熱軋(ya)(ya)無縫管(guan)(guan)(guan)一(yi)般(ban)在(zai)自動軋(ya)(ya)管(guan)(guan)(guan)機(ji)組上(shang)(shang)生產(chan)。實心管(guan)(guan)(guan)坯(pi)經檢查并清除表面缺陷截成(cheng)所需長度，在(zai)管(guan)(guan)(guan)坯(pi)穿(chuan)孔端端面上(shang)(shang)定(ding)心然后送(song)往加(jia)(jia)熱爐加(jia)(jia)熱在(zai)穿(chuan)孔機(ji)上(shang)(shang)穿(chuan)孔在(zai)穿(chuan)孔同時不(bu)斷旋(xuan)轉和前進(jin)，在(zai)軋(ya)(ya)輥(gun)和頂頭的(de)作用(yong)下，管(guan)(guan)(guan)坯(pi)內部逐漸形成(cheng)空腔稱(cheng)毛管(guan)(guan)(guan)，再(zai)送(song)至自動軋(ya)(ya)管(guan)(guan)(guan)機(ji)上(shang)(shang)繼續(xu)軋(ya)(ya)制**后經均(jun)整(zheng)(zheng)機(ji)均(jun)整(zheng)(zheng)壁厚，經定(ding)徑(減徑）機(ji)定(ding)徑，達到規格要求。