(1)使用(yong)合理(li)的夾緊方(fang)法和固定裝置
目的(de)均勻(yun)(yun)加(jia)熱(re)和(he)冷卻(que)工件以減(jian)少(shao)(shao)不均勻(yun)(yun)的(de)熱(re)應力和(he)不均勻(yun)(yun)的(de)組織應力以減(jian)少(shao)(shao)變(bian)形(xing)。夾緊(jin)方法可以改(gai)變(bian)。圓盤部(bu)(bu)件垂(chui)直于油面,軸部(bu)(bu)件垂(chui)直安裝。使用補(bu)償墊(dian)圈和(he)支撐墊(dian)圈。 ,花鍵孔(kong)部(bu)(bu)件可使用滲碳芯軸,疊加(jia)墊(dian)圈等。
(2)加工
當熱(re)(re)(re)(re)處(chu)(chu)(chu)理(li)(li)(li)是工(gong)(gong)件(jian)(jian)加(jia)工(gong)(gong)過程的(de)(de)最(zui)后(hou)(hou)一(yi)步(bu)時(shi),熱(re)(re)(re)(re)處(chu)(chu)(chu)理(li)(li)(li)變(bian)(bian)形的(de)(de)允許值應(ying)(ying)滿足圖紙上指定(ding)的(de)(de)工(gong)(gong)件(jian)(jian)尺寸(cun),變(bian)(bian)形變(bian)(bian)量(liang)(liang)應(ying)(ying)根(gen)據(ju)前一(yi)加(jia)工(gong)(gong)的(de)(de)尺寸(cun)確定(ding)。因(yin)(yin)此(ci),根(gen)據(ju)工(gong)(gong)件(jian)(jian)的(de)(de)變(bian)(bian)形,應(ying)(ying)在(zai)熱(re)(re)(re)(re)處(chu)(chu)(chu)理(li)(li)(li)之前進(jin)行(xing)尺寸(cun)的(de)(de)預校正(zheng),以使(shi)熱(re)(re)(re)(re)處(chu)(chu)(chu)理(li)(li)(li)變(bian)(bian)形在(zai)合格范圍內(nei)。當熱(re)(re)(re)(re)處(chu)(chu)(chu)理(li)(li)(li)是中(zhong)間(jian)過程時(shi),應(ying)(ying)將(jiang)熱(re)(re)(re)(re)處(chu)(chu)(chu)理(li)(li)(li)前的(de)(de)加(jia)工(gong)(gong)余量(liang)(liang)視為加(jia)工(gong)(gong)余量(liang)(liang)和熱(re)(re)(re)(re)處(chu)(chu)(chu)理(li)(li)(li)變(bian)(bian)形的(de)(de)總(zong)和。通常,加(jia)工(gong)(gong)余量(liang)(liang)容(rong)易確定(ding),并且由(you)于許多影響(xiang)因(yin)(yin)素而使(shi)熱(re)(re)(re)(re)處(chu)(chu)(chu)理(li)(li)(li)更加(jia)復雜,因(yin)(yin)此(ci)留有足夠(gou)的(de)(de)加(jia)工(gong)(gong)余量(liang)(liang)用(yong)(yong)于加(jia)工(gong)(gong),其余的(de)(de)可以用(yong)(yong)作熱(re)(re)(re)(re)處(chu)(chu)(chu)理(li)(li)(li)容(rong)許變(bian)(bian)形變(bian)(bian)量(liang)(liang)。熱(re)(re)(re)(re)處(chu)(chu)(chu)理(li)(li)(li)后(hou)(hou)的(de)(de)加(jia)工(gong)(gong)后(hou)(hou),根(gen)據(ju)工(gong)(gong)件(jian)(jian)的(de)(de)變(bian)(bian)形規律,采用(yong)(yong)抗變(bian)(bian)形和收(shou)縮端預擴孔(kong),以提高淬火后(hou)(hou)的(de)(de)變(bian)(bian)形合格率。
(3)使用適當(dang)的媒體
鋼熱處理廠家在確保相(xiang)同的硬度(du)(du)要求的前提下,嘗試使用(yong)油(you)性(xing)(xing)介質(zhi)(zhi)(zhi)(zhi)。實(shi)驗和(he)實(shi)踐證明(ming),在沒有其他條(tiao)(tiao)件的前提下,油(you)性(xing)(xing)介質(zhi)(zhi)(zhi)(zhi)的冷(leng)卻速度(du)(du)較慢,而(er)水(shui)性(xing)(xing)介質(zhi)(zhi)(zhi)(zhi)的冷(leng)卻速度(du)(du)則(ze)相(xiang)對較快(kuai)。而(er)且,與(yu)油(you)性(xing)(xing)介質(zhi)(zhi)(zhi)(zhi)相(xiang)比(bi),水(shui)溫變化對水(shui)性(xing)(xing)介質(zhi)(zhi)(zhi)(zhi)的冷(leng)卻特性(xing)(xing)影響(xiang)更大。在相(xiang)同的熱處理條(tiao)(tiao)件下,與(yu)水(shui)性(xing)(xing)介質(zhi)(zhi)(zhi)(zhi)相(xiang)比(bi),淬(cui)火后油(you)性(xing)(xing)介質(zhi)(zhi)(zhi)(zhi)的變形量相(xiang)對較小。
鋼熱處理廠家可以改善(shan)工件的(de)(de)機(ji)械性(xing)能(neng),并提(ti)高(gao)工件的(de)(de)強度和(he)硬度,但不可避免地產生變形效果。現階段,我們(men)必(bi)須(xu)重(zhong)視中(zhong)國(guo)熱(re)(re)處(chu)理技術和(he)設備的(de)(de)改進,不斷學習國(guo)外先進技術,提(ti)高(gao)熱(re)(re)處(chu)理工件的(de)(de)質量和(he)合格率,為中(zhong)國(guo)熱(re)(re)處(chu)理行業(ye)做出貢獻。