黄色三级片视频

大(da)(da)口(kou)徑(jing)(jing)(jing)厚(hou)壁(bi)(bi)無(wu)縫鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)是(shi)(shi)用鋼(gang)(gang)(gang)(gang)(gang)錠或實心管(guan)(guan)(guan)(guan)(guan)坯(pi)經(jing)(jing)(jing)穿(chuan)(chuan)孔(kong)制(zhi)(zhi)成毛管(guan)(guan)(guan)(guan)(guan)，然(ran)后(hou)(hou)(hou)(hou)(hou)(hou)經(jing)(jing)(jing)熱軋(ya)制(zhi)(zhi)成。大(da)(da)口(kou)徑(jing)(jing)(jing)厚(hou)壁(bi)(bi)無(wu)縫鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)在(zai)我國(guo)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)業中(zhong)具有(you)重要(yao)(yao)(yao)的地位。據不完全統計，我國(guo)現有(you)無(wu)縫管(guan)(guan)(guan)(guan)(guan)生產(chan)企業約240多家(jia)，大(da)(da)口(kou)徑(jing)(jing)(jing)厚(hou)壁(bi)(bi)無(wu)縫鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)機(ji)組約250多套，大(da)(da)口(kou)徑(jing)(jing)(jing)的厚(hou)壁(bi)(bi)無(wu)縫鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)主要(yao)(yao)(yao)是(shi)(shi)以它的鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)的外部(bu)口(kou)徑(jing)(jing)(jing)來(lai)說的，一(yi)般外徑(jing)(jing)(jing)在(zai)325毫(hao)米以上(shang)的我們都(dou)稱為大(da)(da)口(kou)徑(jing)(jing)(jing)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)，厚(hou)壁(bi)(bi)呢，一(yi)般壁(bi)(bi)厚(hou)在(zai)20毫(hao)米以上(shang)的就(jiu)可以了， 以下(xia)是(shi)(shi)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)的制(zhi)(zhi)造過(guo)(guo)(guo)程：鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)的原(yuan)料(liao)(liao)是(shi)(shi)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)坯(pi)料(liao)(liao)，管(guan)(guan)(guan)(guan)(guan)坯(pi)要(yao)(yao)(yao)經(jing)(jing)(jing)過(guo)(guo)(guo)切割(ge)(ge)機(ji)的切割(ge)(ge)加(jia)(jia)工成長度約為1米的坯(pi)料(liao)(liao)，并經(jing)(jing)(jing)傳送帶(dai)送到熔爐內(nei)加(jia)(jia)熱。鋼(gang)(gang)(gang)(gang)(gang)坯(pi)被(bei)送入(ru)熔爐內(nei)加(jia)(jia)熱，溫度大(da)(da)約為1200℃。燃料(liao)(liao)為氫氣(qi)或乙炔(gui)。爐內(nei)溫度控(kong)制(zhi)(zhi)是(shi)(shi)關鍵性(xing)的問(wen)題·圓管(guan)(guan)(guan)(guan)(guan)坯(pi)出(chu)爐后(hou)(hou)(hou)(hou)(hou)(hou)要(yao)(yao)(yao)經(jing)(jing)(jing)過(guo)(guo)(guo)壓(ya)(ya)(ya)力(li)穿(chuan)(chuan)孔(kong)機(ji)進行穿(chuan)(chuan)空(kong)。一(yi)般較常(chang)見(jian)的穿(chuan)(chuan)孔(kong)機(ji)是(shi)(shi)錐形輥穿(chuan)(chuan)孔(kong)機(ji)，這種(zhong)穿(chuan)(chuan)孔(kong)機(ji)生產(chan)效率高，產(chan)品質量(liang)好(hao)，穿(chuan)(chuan)孔(kong)擴(kuo)徑(jing)(jing)(jing)量(liang)大(da)(da)，可穿(chuan)(chuan)多種(zhong)鋼(gang)(gang)(gang)(gang)(gang)種(zhong)。穿(chuan)(chuan)孔(kong)后(hou)(hou)(hou)(hou)(hou)(hou)，圓管(guan)(guan)(guan)(guan)(guan)坯(pi)就(jiu)先(xian)后(hou)(hou)(hou)(hou)(hou)(hou)被(bei)三輥斜軋(ya)、連軋(ya)或擠壓(ya)(ya)(ya)。擠壓(ya)(ya)(ya)后(hou)(hou)(hou)(hou)(hou)(hou)要(yao)(yao)(yao)脫管(guan)(guan)(guan)(guan)(guan)定(ding)徑(jing)(jing)(jing)。定(ding)徑(jing)(jing)(jing)機(ji)通過(guo)(guo)(guo)錐形鉆(zhan)頭高速旋轉入(ru)鋼(gang)(gang)(gang)(gang)(gang)胚打孔(kong)，形成鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)。鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)內(nei)徑(jing)(jing)(jing)由定(ding)徑(jing)(jing)(jing)機(ji)鉆(zhan)頭的外徑(jing)(jing)(jing)長度來(lai)確定(ding)。鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)經(jing)(jing)(jing)定(ding)徑(jing)(jing)(jing)后(hou)(hou)(hou)(hou)(hou)(hou)，進入(ru)冷(leng)(leng)卻(que)塔中(zhong)，通過(guo)(guo)(guo)噴(pen)水冷(leng)(leng)卻(que)，鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)經(jing)(jing)(jing)冷(leng)(leng)卻(que)后(hou)(hou)(hou)(hou)(hou)(hou)，就(jiu)要(yao)(yao)(yao)被(bei)矯(jiao)直（其實現在(zai)很多的廠家(jia)已經(jing)(jing)(jing)不用再矯(jiao)直機(ji)矯(jiao)直了，而是(shi)(shi)在(zai)鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)通過(guo)(guo)(guo)軋(ya)機(ji)就(jiu)直接(jie)達到了它的鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)本身的直度了）。鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)經(jing)(jing)(jing)矯(jiao)直后(hou)(hou)(hou)(hou)(hou)(hou)由傳送帶(dai)送至金屬探(tan)傷機(ji)（或水壓(ya)(ya)(ya)實驗）進行內(nei)部(bu)探(tan)傷。若鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)內(nei)部(bu)有(you)裂紋(wen)，氣(qi)泡等問(wen)題，將被(bei)探(tan)測(ce)出(chu)。鋼(gang)(gang)(gang)(gang)(gang)管(guan)(guan)(guan)(guan)(guan)質檢(jian)后(hou)(hou)(hou)(hou)(hou)(hou)還要(yao)(yao)(yao)通過(guo)(guo)(guo)嚴(yan)格(ge)的手工挑(tiao)選（現在(zai)都(dou)有(you)激光(guang)探(tan)測(ce)檢(jian)驗）。