不(bu)銹鋼封(feng)頭(tou)在加熱和冷(leng)(leng)(leng)卻過(guo)程中,不(bu)銹鋼封(feng)頭(tou)由(you)于(yu)表(biao)層和心(xin)(xin)部(bu)(bu)的(de)(de)冷(leng)(leng)(leng)卻速(su)度(du)和時間的(de)(de)不(bu)一(yi)致,形(xing)成(cheng)(cheng)溫差，就(jiu)會導致體積(ji)膨脹和收(shou)縮(suo)不(bu)均而產(chan)生應(ying)力(li)(li),即(ji)熱應(ying)力(li)(li)。在熱應(ying)力(li)(li)的(de)(de)作用下(xia)(xia),由(you)于(yu)表(biao)層開(kai)始溫度(du)低于(yu)心(xin)(xin)部(bu)(bu),收(shou)縮(suo)也大(da)(da)于(yu)心(xin)(xin)部(bu)(bu)而使心(xin)(xin)部(bu)(bu)受(shou)(shou)(shou)拉,當冷(leng)(leng)(leng)卻結束時，由(you)于(yu)心(xin)(xin)部(bu)(bu)冷(leng)(leng)(leng)卻體積(ji)收(shou)縮(suo)不(bu)能自由(you)進行(xing)而使表(biao)層受(shou)(shou)(shou)壓心(xin)(xin)部(bu)(bu)受(shou)(shou)(shou)拉。即(ji)在熱應(ying)力(li)(li)的(de)(de)作用下(xia)(xia)使工件表(biao)層受(shou)(shou)(shou)壓而心(xin)(xin)部(bu)(bu)受(shou)(shou)(shou)拉。這種現象受(shou)(shou)(shou)到冷(leng)(leng)(leng)卻速(su)度(du),材料成(cheng)(cheng)分和熱處(chu)理工藝等因素的(de)(de)影響。當冷(leng)(leng)(leng)卻速(su)度(du)愈快(kuai),含碳量和合(he)金成(cheng)(cheng)分愈高,冷(leng)(leng)(leng)卻過(guo)程中在熱應(ying)力(li)(li)作用下(xia)(xia)產(chan)生的(de)(de)不(bu)均勻塑性變(bian)形(xing)愈大(da)(da),形(xing)成(cheng)(cheng)的(de)(de)殘余應(ying)力(li)(li)就(jiu)愈大(da)(da)。
另一方面鋼(gang)在(zai)(zai)熱(re)(re)處理過(guo)程中(zhong)由于組(zu)(zu)織(zhi)的(de)(de)(de)(de)(de)(de)變(bian)(bian)(bian)化即奧氏體(ti)向(xiang)(xiang)馬氏體(ti)轉(zhuan)變(bian)(bian)(bian)時(shi)(shi)(shi),因(yin)(yin)比(bi)容的(de)(de)(de)(de)(de)(de)增大會伴隨(sui)工(gong)(gong)件體(ti)積的(de)(de)(de)(de)(de)(de)膨(peng)脹(zhang),工(gong)(gong)件各部(bu)(bu)位(wei)先后相(xiang)(xiang)變(bian)(bian)(bian)，造(zao)成(cheng)封頭體(ti)積長大不一致而產生(sheng)組(zu)(zu)織(zhi)應(ying)(ying)(ying)力(li)。不銹鋼(gang)封頭組(zu)(zu)織(zhi)應(ying)(ying)(ying)力(li)變(bian)(bian)(bian)化的(de)(de)(de)(de)(de)(de)結(jie)果是(shi)(shi)(shi)表(biao)層受(shou)(shou)拉(la)應(ying)(ying)(ying)力(li),心(xin)部(bu)(bu)受(shou)(shou)壓(ya)應(ying)(ying)(ying)力(li),恰好(hao)與(yu)熱(re)(re)應(ying)(ying)(ying)力(li)相(xiang)(xiang)反。組(zu)(zu)織(zhi)應(ying)(ying)(ying)力(li)的(de)(de)(de)(de)(de)(de)大小與(yu)工(gong)(gong)件在(zai)(zai)馬氏體(ti)相(xiang)(xiang)變(bian)(bian)(bian)區的(de)(de)(de)(de)(de)(de)冷(leng)卻速度(du),形狀，材料(liao)的(de)(de)(de)(de)(de)(de)化學(xue)成(cheng)分等(deng)因(yin)(yin)素(su)有關。只不過(guo)熱(re)(re)應(ying)(ying)(ying)力(li)在(zai)(zai)組(zu)(zu)織(zhi)轉(zhuan)變(bian)(bian)(bian)以(yi)前(qian)就(jiu)已經產生(sheng)了不銹鋼(gang)封頭，而組(zu)(zu)織(zhi)應(ying)(ying)(ying)力(li)則是(shi)(shi)(shi)在(zai)(zai)組(zu)(zu)織(zhi)轉(zhuan)變(bian)(bian)(bian)過(guo)程中(zhong)產生(sheng)的(de)(de)(de)(de)(de)(de),在(zai)(zai)整個(ge)冷(leng)卻過(guo)程中(zhong),熱(re)(re)應(ying)(ying)(ying)力(li)與(yu)組(zu)(zu)織(zhi)應(ying)(ying)(ying)力(li)綜合作用(yong)的(de)(de)(de)(de)(de)(de)結(jie)果,就(jiu)是(shi)(shi)(shi)封頭工(gong)(gong)件中(zhong)實際存在(zai)(zai)的(de)(de)(de)(de)(de)(de)應(ying)(ying)(ying)力(li)。這兩(liang)種應(ying)(ying)(ying)力(li)綜合作用(yong)的(de)(de)(de)(de)(de)(de)結(jie)果是(shi)(shi)(shi)十分復(fu)雜的(de)(de)(de)(de)(de)(de),受(shou)(shou)著許(xu)多因(yin)(yin)素(su)的(de)(de)(de)(de)(de)(de)影響,如成(cheng)分、形狀、熱(re)(re)處理工(gong)(gong)藝等(deng)。就(jiu)其發展(zhan)過(guo)程來說只有兩(liang)種類型,即熱(re)(re)應(ying)(ying)(ying)力(li)和(he)組(zu)(zu)織(zhi)應(ying)(ying)(ying)力(li),作用(yong)方向(xiang)(xiang)相(xiang)(xiang)反時(shi)(shi)(shi)二者抵消,作用(yong)方向(xiang)(xiang)相(xiang)(xiang)同(tong)時(shi)(shi)(shi)二者相(xiang)(xiang)互迭加(jia)。不管是(shi)(shi)(shi)相(xiang)(xiang)互抵消還是(shi)(shi)(shi)相(xiang)(xiang)互迭加(jia),兩(liang)個(ge)應(ying)(ying)(ying)力(li)應(ying)(ying)(ying)有一個(ge)占主(zhu)導因(yin)(yin)素(su),熱(re)(re)應(ying)(ying)(ying)力(li)占主(zhu)導地位(wei)時(shi)(shi)(shi)的(de)(de)(de)(de)(de)(de)作用(yong)結(jie)果是(shi)(shi)(shi)工(gong)(gong)件心(xin)部(bu)(bu)受(shou)(shou)拉(la),表(biao)面受(shou)(shou)壓(ya)。組(zu)(zu)織(zhi)應(ying)(ying)(ying)力(li)占主(zhu)導地位(wei)時(shi)(shi)(shi)的(de)(de)(de)(de)(de)(de)作用(yong)結(jie)果是(shi)(shi)(shi)工(gong)(gong)件心(xin)部(bu)(bu)受(shou)(shou)壓(ya)表(biao)面受(shou)(shou)拉(la)。
新(xin)鄉(xiang)封(feng)頭(tou)廠(chang)質(zhi)量管理嚴格、工藝文(wen)件完備，按(an)照壓(ya)力(li)容(rong)(rong)(rong)器(qi)用(yong)(yong)封(feng)頭(tou)的(de)制造(zao)要求，能夠(gou)對壓(ya)力(li)容(rong)(rong)(rong)器(qi)用(yong)(yong)封(feng)頭(tou)制造(zao)過(guo)(guo)程(cheng)**控制，使(shi)壓(ya)力(li)容(rong)(rong)(rong)器(qi)用(yong)(yong)封(feng)頭(tou)全(quan)部生(sheng)產(chan)過(guo)(guo)程(cheng)得到有效控制，確保(bao)出廠(chang)產(chan)品達到國(guo)際標準(zhun)及用(yong)(yong)戶要求。買封(feng)頭(tou)就到新(xin)鄉(xiang)封(feng)頭(tou)廠(chang)，新(xin)鄉(xiang)封(feng)頭(tou)廠(chang)生(sheng)產(chan)封(feng)頭(tou)質(zhi)量上(shang)乘，價格便宜，新(xin)鄉(xiang)封(feng)頭(tou)廠(chang)歡迎(ying)您。
