冷拔无缝钢管是钢管的一种,即其按生产工艺的差异分类的一种,有别于热扎(扩)管。在毛管料或原料管扩径的过程中根据多道次的冷拔制作而成,通常在0.5~100T的单链式或双链式冷拔机中进行。冷扎(拨)钢管除分一般钢管、低中压锅炉钢管、高压锅炉钢管、合金钢管、不锈钢管、石油裂化管、机械加工管、厚壁管、口径加内模冷拔管其他钢管外,还包括炭素薄壁钢管、合金薄壁钢管、不锈薄壁钢管、异型钢管。冷拔无缝钢管其直径可以去6mm,厚度可到0.25mm,薄壁管外径可到5mm厚度低于0.25mm规格,精度及其表层质量均明显优于热扎(扩)管,但受工艺牵制,其规格及其长度均遭受一定限定。
冷拔无缝钢管是用于机械系统、液压机械的尺寸精度高和表面光滑度好的精密冷拔无缝管。
冷(leng)拔无缝(feng)钢管(guan)异形冷(leng)拔管(guan)广泛用于各种零部件、工具和机械零部件。和圆(yuan)管(guan)相比(bi),冷(leng)拔无缝(feng)钢管(guan)一般都有(you)(you)较(jiao)大(da)的惯(guan)性矩和截(jie)面(mian)模数,有(you)(you)较(jiao)大(da)的抗(kang)弯抗(kang)扭能(neng)力,能(neng)够大(da)大(da)减轻构(gou)造(zao)净重,节省钢材。
冷拔无缝(feng)钢管一(yi)(yi)般是依据断截面(mian)来划分(fen)的,按材料而言可以分(fen)为无缝(feng)管冷拔无缝(feng)钢管,铝合金冷拔无缝(feng)钢管,塑胶冷拔无缝(feng)钢管。下(xia)面(mian)主(zhu)要介绍一(yi)(yi)下(xia)钢管冷拔无缝(feng)钢管。
钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)冷(leng)拔无缝(feng)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)可(ke)分为椭圆(yuan)型(xing)(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、三角(jiao)形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、六角(jiao)形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、棱(leng)形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、八角(jiao)形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、半(ban)圆(yuan)型(xing)(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)圆(yuan),不(bu)等边六角(jiao)形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、五瓣(ban)梅花(hua)形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、双凸形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、双凹形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、瓜子形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、锥形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)、波(bo)纹形(xing)(xing)异(yi)(yi)型(xing)(xing)(xing)钢(gang)(gang)管(guan)(guan)(guan)(guan)(guan)。
冷(leng)(leng)扎(zha)与冷(leng)(leng)拔比(bi),其(qi)优点在于加工(gong)道次少,尺寸精度高(gao),表(biao)层质(zhi)量好,不(bu)浪费材料。冷(leng)(leng)拔的优势设(she)备简(jian)易(yi),模具(ju)简(jian)易(yi),冷(leng)(leng)作硬化效(xiao)果好,力学性(xing)能比(bi)冷(leng)(leng)扎(zha)更佳。
此(ci)外(wai)冷(leng)扎和冷(leng)拔(ba)的工艺不(bu)同。冷(leng)扎与冷(leng)拔(ba)比,其(qi)优点在于加(jia)工道次少(shao),尺寸精度高,表层质量(liang)好,不(bu)浪(lang)费材料。冷(leng)拔(ba)的优势(shi)设(she)备简易,模具(ju)简易,冷(leng)作硬化效果好,力学性(xing)能比冷(leng)扎更佳。