SMC汽缸變形較大或漏汽嚴(yán)重的結(jié)合面，采用研刮結(jié)合面的方法
如果上缸結(jié)合面變形在0.05mm范圍內(nèi)，以上缸結(jié)合面為基準(zhǔn)面，在下缸結(jié)合面涂紅丹或是壓印藍(lán)紙，根據(jù)痕跡研刮下缸。如果上缸的結(jié)合面變形量大，在上缸涂紅丹，用大平尺研出痕跡，把上缸研平?；蚴遣扇C(jī)械加工的方法把上缸結(jié)合面找平，再以上缸為基準(zhǔn)研刮下缸結(jié)合面。汽缸結(jié)合面的研刮一般有兩種方法：
⑴是不緊結(jié)合面的螺栓，用千斤頂微微推動(dòng)上缸前后移動(dòng)，根據(jù)下缸結(jié)合面紅丹情況來研刮。這種方法適合結(jié)構(gòu)剛性強(qiáng)的高壓缸。
⑵是緊結(jié)合面的螺栓，根據(jù)塞尺的檢查結(jié)合面的嚴(yán)密性，測出數(shù)值及壓出的痕跡，修刮結(jié)合面，這種方法可以排除汽缸垂弧對間隙的影響。
⒉采用適當(dāng)?shù)?strong>汽缸密封材料
因汽輪機(jī)汽缸密封劑還沒有統(tǒng)一的國家標(biāo)準(zhǔn)和行業(yè)標(biāo)準(zhǔn)，制作原料和配方也各不相同，產(chǎn)品質(zhì)量參差不齊；在選擇汽輪機(jī)汽缸密封劑時(shí)，就要選在行業(yè)內(nèi)有口碑，產(chǎn)品質(zhì)量有保證的正規(guī)生產(chǎn)廠家，以保證檢修處理后汽缸的嚴(yán)密性。
局部補(bǔ)焊的方法
由于汽缸結(jié)合面被蒸汽沖刷或腐蝕出溝痕，選用適當(dāng)?shù)暮笚l把溝痕添平，用平板或平尺研出痕跡，研刮焊道和結(jié)合面在同一平面內(nèi)。汽缸結(jié)合面變形較大或是漏汽嚴(yán)重時(shí)，在下缸的結(jié)合面補(bǔ)焊一條或兩條10—20mm寬的密消除間隙封帶，然后用平尺或是扣上缸測量，并涂紅丹研刮，直到消除間隙。此操作的工藝也很簡單，焊前預(yù)熱汽缸至150℃，然后在室溫下進(jìn)行分段退焊或跳焊。選用奧氏體焊條，如A407、A412，焊后用石棉布覆蓋保溫緩冷。待冷卻室溫后進(jìn)行打磨修刮。

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