黄瓜视频下载

    天津無縫鋼管：隧道鋼花管(guan)(guan)(guan)(guan)按生產方(fang)法不同可分(fen)為(wei)熱(re)軋管(guan)(guan)(guan)(guan)、冷(leng)軋管(guan)(guan)(guan)(guan)、冷(leng)拔管(guan)(guan)(guan)(guan)、擠(ji)壓(ya)管(guan)(guan)(guan)(guan)等(deng)，熱(re)軋無(wu)縫管(guan)(guan)(guan)(guan)一(yi)般在(zai)自動軋管(guan)(guan)(guan)(guan)機(ji)(ji)(ji)組上生產。實(shi)心管(guan)(guan)(guan)(guan)坯經檢(jian)查并清除(chu)表(biao)面(mian)缺陷(xian)截(jie)成(cheng)所需長度，在(zai)管(guan)(guan)(guan)(guan)坯穿孔(kong)端(duan)端(duan)面(mian)上定心然后送往(wang)加熱(re)爐加熱(re)在(zai)穿孔(kong)機(ji)(ji)(ji)上穿孔(kong)在(zai)穿孔(kong)同時不斷旋轉和(he)前(qian)進(jin)，在(zai)軋輥和(he)頂頭的作用下(xia)，管(guan)(guan)(guan)(guan)坯內部逐漸(jian)形成(cheng)空(kong)腔稱毛管(guan)(guan)(guan)(guan)，再(zai)送至自動軋管(guan)(guan)(guan)(guan)機(ji)(ji)(ji)上繼續(xu)軋制**后經均整機(ji)(ji)(ji)均整壁厚(hou)，經定徑(jing)(減(jian)徑(jing)）機(ji)(ji)(ji)定徑(jing)，達到規格要求(qiu)。