當前位置：
四川(chuan)熱鍍鋅方管均勻變(bian)(bian)(bian)形(xing)(xing)(xing)是物體(ti)變(bian)(bian)(bian)形(xing)(xing)(xing)的(de)簡單情況(kuang)，其特點是：平(ping)面與敘線(xian)在變(bian)(bian)(bian)形(xing)(xing)(xing)后仍為平(ping)面與直(zhi)線(xian).平(ping)行(xing)線(xian)與平(ping)行(xing)平(ping)面在變(bian)(bian)(bian)形(xing)(xing)(xing)后仍保持平(ping)行(xing)，與應(ying)變(bian)(bian)(bian)主軸方向相垂直(zhi)的(de)立方體(ti).在均勻變(bian)(bian)(bian)形(xing)(xing)(xing)后僅(jin)有線(xian)性尺(chi)于的(de)改變(bian)(bian)(bian)而無剪變(bian)(bian)(bian)形(xing)(xing)(xing)產(chan)生，變(bian)(bian)(bian)形(xing)(xing)(xing)體(ti)若(ruo)為球(qiu)面.變(bian)(bian)(bian)形(xing)(xing)(xing)后則為橢球(qiu)面。
由此(ci)可見，均(jun)勻變(bian)(bian)形的特征表現(xian)為物體各(ge)點的位移是原(yuan)始坐標的線性函數，均(jun)勻變(bian)(bian)形只有三個主(zhu)應(ying)(ying)變(bian)(bian)而無剪切應(ying)(ying)變(bian)(bian)。
四川熱鍍鋅方管在金屬壓(ya)力(li)加工理(li)論(lun)中.特別(bie)是在軋管理(li)論(lun)中.廣(guang)泛采用對數應(ying)變(bian)來表(biao)示均(jun)勻變(bian)形。對數應(ying)變(bian)較相對變(bian)形系性能更(geng)精(jing)確(que)地表(biao)示物體的變(bian)形程度。
熱(re)鍍鋅(xin)方管(guan)(guan)(guan)(guan)(guan)(guan)也稱焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)，是(shi)用(yong)鋼(gang)板或鋼(gang)帶經(jing)過卷曲(qu)成型后焊(han)(han)(han)(han)接(jie)(jie)制成的(de)(de)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)。焊(han)(han)(han)(han)接(jie)(jie)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)生(sheng)(sheng)產(chan)工藝(yi)簡單(dan)，生(sheng)(sheng)產(chan)效率高(gao)，品(pin)種(zhong)規(gui)格(ge)多(duo)，設(she)備投(tou)資少(shao)，但一般強度(du)低(di)(di)于(yu)無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)。 20 世(shi)紀 30 年代以來，隨著優質熱(re)鍍鋅(xin)方管(guan)(guan)(guan)(guan)(guan)(guan)軋(ya)生(sheng)(sheng)產(chan)的(de)(de)迅速發展以及焊(han)(han)(han)(han)接(jie)(jie)和(he)檢驗技術的(de)(de)進步，焊(han)(han)(han)(han)縫(feng)質量(liang)不斷提高(gao)，焊(han)(han)(han)(han)接(jie)(jie)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)品(pin)種(zhong)規(gui)格(ge)日益增多(duo)，并在(zai)越(yue)來越(yue)多(duo)的(de)(de)領(ling)域代替了(le)無(wu)縫(feng)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)。焊(han)(han)(han)(han)接(jie)(jie)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)按焊(han)(han)(han)(han)縫(feng)的(de)(de)形式分為直(zhi)縫(feng)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)和(he)螺旋(xuan)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)。直(zhi)縫(feng)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)生(sheng)(sheng)產(chan)工藝(yi)簡單(dan)，生(sheng)(sheng)產(chan)效率高(gao)，成本低(di)(di)，發展較(jiao)快。螺旋(xuan)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)強度(du)一般比(bi)直(zhi)縫(feng)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)高(gao)，能(neng)用(yong)較(jiao)窄的(de)(de)坯(pi)料(liao)生(sheng)(sheng)產(chan)管(guan)(guan)(guan)(guan)(guan)(guan)徑較(jiao)大(da)的(de)(de)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)，還可以用(yong)同樣寬度(du)的(de)(de)坯(pi)料(liao)生(sheng)(sheng)產(chan)管(guan)(guan)(guan)(guan)(guan)(guan)徑不同的(de)(de)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)。但是(shi)與相(xiang)同長度(du)的(de)(de)直(zhi)縫(feng)管(guan)(guan)(guan)(guan)(guan)(guan)相(xiang)比(bi)，焊(han)(han)(han)(han)縫(feng)長度(du)增加(jia) 30~100% ，而且(qie)生(sheng)(sheng)產(chan)速度(du)較(jiao)低(di)(di)。因此，較(jiao)小口徑的(de)(de)焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)大(da)都采用(yong)直(zhi)縫(feng)焊(han)(han)(han)(han)，大(da)口徑焊(han)(han)(han)(han)管(guan)(guan)(guan)(guan)(guan)(guan)則大(da)多(duo)采用(yong)螺旋(xuan)焊(han)(han)(han)(han)。
低壓(ya)流(liu)體(ti)(ti)(ti)輸(shu)送(song)(song)用(yong)熱鍍鋅方管(guan)(guan)(guan) 也稱(cheng)(cheng)一般焊(han)(han)管(guan)(guan)(guan)，俗稱(cheng)(cheng)黑管(guan)(guan)(guan)。是用(yong)于輸(shu)送(song)(song)水(shui)、煤氣、空氣、油和(he)取暖蒸汽等一般較低壓(ya)力流(liu)體(ti)(ti)(ti)和(he)其他(ta)用(yong)途的(de)焊(han)(han)接(jie)(jie)鋼(gang)管(guan)(guan)(guan)。鋼(gang)管(guan)(guan)(guan)接(jie)(jie)壁厚分為普通鋼(gang)管(guan)(guan)(guan)和(he)加(jia)厚鋼(gang)管(guan)(guan)(guan);接(jie)(jie)管(guan)(guan)(guan)端形式分為不(bu)帶(dai)(dai)螺(luo)紋鋼(gang)管(guan)(guan)(guan)和(he)帶(dai)(dai)螺(luo)紋鋼(gang)管(guan)(guan)(guan)。鋼(gang)管(guan)(guan)(guan)的(de)規格用(yong)公稱(cheng)(cheng)口徑(jing)表(biao)示(shi)，公稱(cheng)(cheng)口徑(jing)是內徑(jing)的(de)近似值。習慣上常用(yong)英寸表(biao)示(shi)，如 11/2 等。低壓(ya)流(liu)體(ti)(ti)(ti)輸(shu)送(song)(song)用(yong)焊(han)(han)接(jie)(jie)鋼(gang)管(guan)(guan)(guan)除直接(jie)(jie)用(yong)于輸(shu)送(song)(song)流(liu)體(ti)(ti)(ti)外(wai)，還大量用(yong)作低壓(ya)流(liu)體(ti)(ti)(ti)輸(shu)送(song)(song)用(yong)鍍鋅焊(han)(han)接(jie)(jie)鋼(gang)管(guan)(guan)(guan)的(de)原管(guan)(guan)(guan)。
