規格尺寸:DN15-1200(NPS:1/2-36 inches)
壁厚:1-18mm(Sch5s to Sch80s)
材質:TA1/TA2/GR1/GR2/TA10/GR12
執行標準(zhun):GB/T12459 GB/T13401 HG/T3651 ASME B16.9
異(yi)徑(jing)(jing)(jing)(jing)管(guan)(大(da)(da)小頭(tou))是用(yong)于管(guan)道變徑(jing)(jing)(jing)(jing)處(chu)的(de)(de)(de)(de)一種管(guan)件。通常(chang)采(cai)用(yong)的(de)(de)(de)(de)成(cheng)(cheng)形(xing)(xing)工(gong)藝為縮(suo)(suo)徑(jing)(jing)(jing)(jing)壓(ya)(ya)制、擴徑(jing)(jing)(jing)(jing)壓(ya)(ya)制或(huo)縮(suo)(suo)徑(jing)(jing)(jing)(jing)加擴徑(jing)(jing)(jing)(jing)壓(ya)(ya)制,對某些規格(ge)的(de)(de)(de)(de)異(yi)徑(jing)(jing)(jing)(jing)管(guan)也可采(cai)用(yong)沖壓(ya)(ya)成(cheng)(cheng)形(xing)(xing)。 異(yi)徑(jing)(jing)(jing)(jing)管(guan)的(de)(de)(de)(de)縮(suo)(suo)徑(jing)(jing)(jing)(jing)成(cheng)(cheng)形(xing)(xing)工(gong)藝是將與異(yi)徑(jing)(jing)(jing)(jing)管(guan)大(da)(da)端(duan)直徑(jing)(jing)(jing)(jing)相等的(de)(de)(de)(de)管(guan)坯放入成(cheng)(cheng)形(xing)(xing)模(mo)中,通過沿管(guan)坯軸向方向的(de)(de)(de)(de)壓(ya)(ya)制,使金屬(shu)沿模(mo)腔運動并收縮(suo)(suo)成(cheng)(cheng)形(xing)(xing)。根據異(yi)徑(jing)(jing)(jing)(jing)管(guan)變徑(jing)(jing)(jing)(jing)的(de)(de)(de)(de)大(da)(da)小,分為一次壓(ya)(ya)制成(cheng)(cheng)形(xing)(xing)或(huo)多(duo)次壓(ya)(ya)制成(cheng)(cheng)形(xing)(xing)。
擴徑工藝主要解決(jue)變徑偏大的異徑管(guan)不易通過縮(suo)徑成形(xing)的情(qing)況(kuang),有時根據材料和產(chan)品(pin)成形(xing)需要,將擴徑與縮(suo)徑的方法合并使用。
在縮徑(jing)或(huo)擴(kuo)徑(jing)變(bian)形(xing)(xing)壓(ya)制過程中,根據不同材料(liao)(liao)和變(bian)徑(jing)情(qing)(qing)況,確定采(cai)用(yong)(yong)冷壓(ya)或(huo)熱(re)(re)壓(ya)。通常情(qing)(qing)況下(xia),盡(jin)量采(cai)用(yong)(yong)冷壓(ya),但對(dui)多次(ci)變(bian)徑(jing)而引(yin)起嚴重的(de)(de)(de)(de)加工硬化的(de)(de)(de)(de)情(qing)(qing)況、壁(bi)厚(hou)偏厚(hou)的(de)(de)(de)(de)情(qing)(qing)況或(huo)合金鋼的(de)(de)(de)(de)材料(liao)(liao)宜(yi)采(cai)用(yong)(yong)熱(re)(re)壓(ya)。 除使用(yong)(yong)鋼管(guan)(guan)為原(yuan)料(liao)(liao)生(sheng)產異(yi)徑(jing)管(guan)(guan)外,對(dui)部(bu)分規格(ge)的(de)(de)(de)(de)異(yi)徑(jing)管(guan)(guan)還可用(yong)(yong)鋼板采(cai)用(yong)(yong)沖(chong)壓(ya)成(cheng)形(xing)(xing)工藝進行(xing)生(sheng)產。拉(la)伸所使用(yong)(yong)的(de)(de)(de)(de)沖(chong)模形(xing)(xing)狀參照(zhao)異(yi)徑(jing)管(guan)(guan)內表面(mian)尺(chi)寸設計(ji),用(yong)(yong)沖(chong)模將下(xia)料(liao)(liao)后的(de)(de)(de)(de)鋼板沖(chong)壓(ya)拉(la)伸成(cheng)形(xing)(xing)
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