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鍛造比(bi)大小(xiao)對鍛件(jian)鍛造效(xiao)果的影響
文章來源:sjzwx 更新時間:2014-12-29 09:37:08
鍛(duan)(duan)件是機械產(chan)品的重(zhong)要(yao)組成部(bu)分。大(da)型(xing)鍛(duan)(duan)件是各(ge)種大(da)型(xing)設備及(ji)裝置中的主要(yao)基礎零(ling)部(bu)件,中小型(xing)鍛(duan)(duan)件毛坯優先采用(yong)滿足內部(bu)質量(liang)要(yao)求的鍛(duan)(duan)材或(huo)軋材作為原材料鍛(duan)(duan)造(zao)(zao)成形。大(da)型(xing)鍛(duan)(duan)件毛坯采用(yong)大(da)型(xing)鋼(gang)(gang)錠(ding)(ding)作為原材料經過一系列(lie)鍛(duan)(duan)造(zao)(zao)工(gong)序(xu)鍛(duan)(duan)造(zao)(zao)成形。大(da)型(xing)鋼(gang)(gang)質鍛(duan)(duan)件毛坯生產(chan)冶(ye)金(jin)(jin)工(gong)藝流程是:煉鋼(gang)(gang)一鑄(zhu)錠(ding)(ding)一鍛(duan)(duan)造(zao)(zao)。其冶(ye)金(jin)(jin)質量(liang)好(hao)壞直(zhi)接(jie)影(ying)響到(dao)熱處理工(gong)序(xu)的工(gong)藝性(xing)能、鍛(duan)(duan)件的使(shi)用(yong)性(xing)能和經濟效益,其中鍛(duan)(duan)造(zao)(zao)為較重(zhong)要(yao)的環節。
鍛(duan)(duan)造(zao)(zao)效(xiao)果一是(shi)指成(cheng)形(xing),即將原(yuan)材料(liao)(liao)經濟地(di)鍛(duan)(duan)制到接近零(ling)件(jian)(jian)的(de)形(xing)狀(zhuang);二是(shi)改善鍛(duan)(duan)件(jian)(jian)內部質量(liang),即破碎鑄態組(zu)織(zhi),細化晶粒和(he)均勻組(zu)織(zhi);鍛(duan)(duan)合疏松和(he)氣(qi)孔等缺陷。原(yuan)材料(liao)(liao)經過鍛(duan)(duan)造(zao)(zao)變(bian)形(xing)使金屬組(zu)織(zhi)發生了變(bian)化,必然會(hui)引起鍛(duan)(duan)坯力學性能(neng)的(de)改變(bian)。鍛(duan)(duan)件(jian)(jian)理想的(de)鍛(duan)(duan)造(zao)(zao)效(xiao)果為(wei)內部質量(liang)高且形(xing)狀(zhuang)尺寸(cun)精。鍛(duan)(duan)造(zao)(zao)中原(yuan)材料(liao)(liao)的(de)塑性變(bian)形(xing)是(shi)成(cheng)形(xing)的(de)必要前提及(ji)改善鍛(duan)(duan)件(jian)(jian)內部質量(liang)的(de)必要條件(jian)(jian)。實際生產中鍛(duan)(duan)件(jian)(jian)毛坯采用(yong)鍛(duan)(duan)造(zao)(zao)比(bi)來規定和(he)衡量(liang)塑性變(bian)形(xing)程(cheng)度(du)的(de)大小。鍛(duan)(duan)造(zao)(zao)比(bi)大小對鍛(duan)(duan)件(jian)(jian)鍛(duan)(duan)造(zao)(zao)效(xiao)果及(ji)力學性能(neng)有著重要影響。