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1、上海交通大學碩士學位論文柴油機氣缸蓋螺栓擰緊工藝的制訂姓名：李彩萍申請學位級別：碩士專業(yè)：機械工程指導教師：吳振華;楊鈞強20060111計算對氣缸蓋螺栓聯(lián)接進行計算分析擰緊時安裝預緊力的分散度缸蓋螺栓預緊力設計實例分析得出計算結果并以缸蓋螺栓聯(lián)接為研究對象建立缸蓋螺栓聯(lián)接體的幾何模型有限元模型進行有限元計算的前處理建立有限元分析ANALSYS通過有限元的研究手法運行求解將得出的缸蓋剛度結果與理論計算結果以及試驗計算結果相比較第五通過試驗驗證柴油機缸蓋螺栓的各項性能指標制訂新的擰緊工藝方案結論本工藝方案將螺栓擰緊至屈服可以充分發(fā)揮螺栓性能降低預緊力散差柴油機工作時螺栓
2、所受的附加載荷小聯(lián)接可靠關鍵詞氣缸蓋螺栓預緊力聯(lián)接分析IITHEDESIGNOFTHETIGHTENINGPROCESSFORTHECA6DLENGINECYLINDERHEADBOLTSABSTRACTThetighteningprocessoftheboltsofthecylinderheadisdesigned,whichisusedinthelargescaleproductionoftheCA6DLEnginesintheFAWDE.Thecylinderhead,boltsandcylinderblockcouplingisanalyzed,calcula
3、tedandtested.Theboltpre-loadingforceiscontrolledatareasonablevaluetoimprovetheperformanceoftheengines.Intheconditionsofthereliabilityofthecoupling,thematerialisusedinthemaximumefficiencytodecreasethedimensionoftheparts,cutthecostandearnthehighestprofitFirstly,thenewtighteningprocessisco
4、mparedwiththeoldone,theadvantageandshortageareanalyzed,theshortageoftheoldprocessisthattheboltpre-loadingforceisinfluencedbythefrictionscatter,whiletheadvantageofthenewoneisthattheboltistighteneduntiltheyieldpointisreached,althoughthetorquecoefficientisscatted,thestablepre-loadingforcei
5、sreached,sothestrengthoftheboltisutilizedatmaximumefficiency.Thebigaxialpre-loadingforceisreached,thediameteroftheboltsarecutdownefficiently,sotheweightoftheengineisdecreasedatthesametime.Theboltatyieldpointcanstandlowervariableforce,thehigherfatiguestrengthandthegoodperformanceofanti-l
6、oose.Secondly,thescatteranalysisoftheaxialpre-loadingandtheinitialtorqueisdetermined.Thescatterofthepre-loadingforceisdeterminedbythescatteroftorquecoefficient.ThebetterfrictionperformanceoftheboltsnotonlycandecreasetheaveragevalueofthetorquecoefficientbutalsocanIIIdecreasethecoefficien
7、tofthetorque.Tominimumtheinfluenceofinitialtorquetheontheendtighteningforce,theinitialtorqueshouldnottoobig.Thirdly,thetheoryofthebasicjointoftheboltisanalyzed,thecorrelationbetweenthetorqueandtheaxialforce,thetighteningtorqueandpre-loadingforce.Fourthly,underthehelpofthe“theti
