中频感应局部加热弯管工艺及设备参数优化

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1、摘要摘要中频感应局部加热弯管是小弯曲半径管材弯曲加工中先进的工艺方法之⋯。本文根据塑性理论和结构静力条件，对中频感应局部加热弯管过程的变形及受力状态进行了系统的理沦分析，建立了力学模型，计算得到了在不同相对弯曲半径条件下弯管过程中弯曲中性层偏移角．塑性变形区的轴向推力和剪力，弯管外侧壁厚减薄率和内侧壁厚增厚率等结果，揭示了各参数对弯管质量的影响，并把该理论模型用于中频感应局部加热弯管工艺及设备参数的优化，为中频弯管加工理论的完善和工艺优化的实现做出了一定的贡献。优化的设备参数是后滚轮与前滚轮之间的距离；前滚轮与塑性变形区中线之间

2、的距离；滚轮中间窄径：滚轮的倾角：相对弯曲半径。优化程序用MATI。AB语言编成。本文还对中频感应局部加热弯管加反向弯矩时的受力状态进行了分析，计算得到了加反向弯矩时弯曲中性层偏移角．塑性变形区的无量纲轴向推力和剪力，弯管外侧壁厚减薄率和内侧壁厚增厚率等结果，分析了反向弯矩对弯管变形过程及成形参数的影响。为小弯曲半径中频弯管工艺的改进提供了理论依据。计算结果表明：在转臂上施加一定的反向弯矩．能有效减小弯管的壁厚减薄率。关谴词中频感应加热：弯管理论模型：小弯曲半径弯管；优化；反向弯矩AbstIactTheoptimumofpipe

3、bendingbyusinginductionheatingprocessesandequipmentparametersAbstractPipebendingusinginductionheatingiSoneofthemostadvancedprocessestoproducebendingpipewithsmallradiUSandlargediameter．‘[hi8paperanalyzedsystematicallYthestressstateanddeformationofpipebendingduringbend

4、ingprocessing．Atheoreticalmodelhasbeenpresented．Theresultsofthethinningandthickeningratioofpipewallthickness，bendingforceonthecrosssectionofplastiCdeformationzonehavebeenobtained．Andthetheoreticalmodelwasappliedtotheoptimumofpipebendingbyusinginductionheatingprocesse

5、sandequipmentparameters．Theoptimalparametersarethedistancebetweenfore—gyrowheelandrear—gyrowheel：thedistancebetweenfore—gyrowheelandtheneutrallayeronthecrosssectionofplastiCdefermation：middlediameterofgyrowheel：slantingangleofgyrowheel：relatirebendirigradius．Programm

6、ing1anguagetoimplementtheoptimizationiSMATLAB．Thispaperhasalsosystematicallyanalyzedthedeformationofpipebendingbyusinginductionheatingapplledacountertorqueduringbendingprocess．Theresultsofthethinningandthickeningratioofpipewallthickness，bendingforceonthecrosssectiono

7、fplastiCdeformatiOnzonehavebeenobtained．Thepaperanalyzedtheprocessofdeformationandeffectoftheformingparametersofpipebendingbyusinginductionheatingappliedacountertorqueduringbendingprocess．ItprowldedtheorybasiSofpipebendingbyUSinginduetionheatingwithsmallradius．Ttshow

8、sthatpipebendingbyUSinginductionheatingappliedacountertnrquecaneffiClentlYreducethethinningratioofpipewallthickness．Keyword：inducti