淬火中残余应力的预测和机加工对残余应力的减少-------外文翻译(原文+译文).rar
淬火中残余应力的预测和机加工对残余应力的减少-------外文翻译(原文+译文),摘要 铝合金淬火后,开发残余应力会导致后续机加工中失真。结果会是,机加工零件可能会失去忍受性和不得不冷加工或是重新加工。残余应力的测量实验是漫长的、乏味的、和非常昂贵的,例如中子x射线衍射技术的最新发展。所以,在这项研究中,al7050锻造块淬火以后,使用数量方法区预测残余应力,而且比较预测结果和实验结果。结果表明了预...
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原文档由会员 wanli1988go 发布
摘 要
铝合金淬火后,开发残余应力会导致后续机加工中失真。结果会是,机加工零件可能会失去忍受性和不得不冷加工或是重新加工。残余应力的测量实验是漫长的、乏味的、和非常昂贵的,例如中子X射线衍射技术的最新发展。所以,在这项研究中,Al7050锻造块淬火以后,使用数量方法区预测残余应力,而且比较预测结果和实验结果。结果表明了预测值与实验结果有很好的一致性,最坏的情况下,偏差也只有10-15%。两种不同的冷加工(压缩和拉伸)方法常常被用来减少残余应力。结果比较好显示了,压缩和拉伸工艺减少的残余应力有90%之多。可是单击压缩铝合金方法减少残余应力比其别低水平的方法更加有效和经济。也研究了弹性模的影响效果。模具偏转被发现对减少残余应力的量从90%降到70%左右。
Residualstressesdevelopedafterquenchingofaluminumalloyscausedistortionduringsubsequentmachining.Asaresult,machinedparts
maybeoutoftoleranceandhavetobecoldworkedorre-machined.Experimentalmeasurementofresidualstressesislengthy,tediousandvery
expensiveevenwiththelatestdevelopmentsinneutronX-raydiffractiontechniques,forinstance.Therefore,inthisstudy,numericaltechniques
areusedtopredictresidualstressesafterquenchingofAl7050forgedblock,andthepredictionswerecomparedwithexperimentalmeasurements.
Theresultsindicatedthatthepredictedvaluesareinverygoodagreementwiththeexperimentalmeasurementswitharound10¨C15%deviationin
theworstcase.Twodifferentmethodsofcoldworking(compressionandstretching)areusedtoreducetheresidualstresses.Thecomparisonof
resultsshowedthatbothcompressionandstretchingprocessesreducedtheresidualstressesmorethan90%.However,single-strikecompression
ofaluminumblocksisfoundtobemoreefcientandcost-effectiveforreducingtheresidualstressestoverylowlevels.Theeffectsofelasticdie
werealsoinvestigated.Diedeectionwasfoundtoaffecttheresidualstressreductioncapabilitynegativelybydecreasingthemagnitudeofstress
reductionfrom90%toabout70%.
铝合金淬火后,开发残余应力会导致后续机加工中失真。结果会是,机加工零件可能会失去忍受性和不得不冷加工或是重新加工。残余应力的测量实验是漫长的、乏味的、和非常昂贵的,例如中子X射线衍射技术的最新发展。所以,在这项研究中,Al7050锻造块淬火以后,使用数量方法区预测残余应力,而且比较预测结果和实验结果。结果表明了预测值与实验结果有很好的一致性,最坏的情况下,偏差也只有10-15%。两种不同的冷加工(压缩和拉伸)方法常常被用来减少残余应力。结果比较好显示了,压缩和拉伸工艺减少的残余应力有90%之多。可是单击压缩铝合金方法减少残余应力比其别低水平的方法更加有效和经济。也研究了弹性模的影响效果。模具偏转被发现对减少残余应力的量从90%降到70%左右。
Residualstressesdevelopedafterquenchingofaluminumalloyscausedistortionduringsubsequentmachining.Asaresult,machinedparts
maybeoutoftoleranceandhavetobecoldworkedorre-machined.Experimentalmeasurementofresidualstressesislengthy,tediousandvery
expensiveevenwiththelatestdevelopmentsinneutronX-raydiffractiontechniques,forinstance.Therefore,inthisstudy,numericaltechniques
areusedtopredictresidualstressesafterquenchingofAl7050forgedblock,andthepredictionswerecomparedwithexperimentalmeasurements.
Theresultsindicatedthatthepredictedvaluesareinverygoodagreementwiththeexperimentalmeasurementswitharound10¨C15%deviationin
theworstcase.Twodifferentmethodsofcoldworking(compressionandstretching)areusedtoreducetheresidualstresses.Thecomparisonof
resultsshowedthatbothcompressionandstretchingprocessesreducedtheresidualstressesmorethan90%.However,single-strikecompression
ofaluminumblocksisfoundtobemoreefcientandcost-effectiveforreducingtheresidualstressestoverylowlevels.Theeffectsofelasticdie
werealsoinvestigated.Diedeectionwasfoundtoaffecttheresidualstressreductioncapabilitynegativelybydecreasingthemagnitudeofstress
reductionfrom90%toabout70%.