发动机罩烘烤变形机理研究及预测模型

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中图分类号：TQ639；U466 文献标志码：B DOI：10.19710/J.cnki.1003-8817.20250221

Research on Deformation Mechanism and Prediction Modelof Engine Hoods during Baking

Jiang Chaofu，Sun Yake，Xie Feng， Zheng Qingshu，Li Huichun，Li Jizheng （Chongqing Chang'an Automobile Co.，Ltd.， Chongqing 400000）

Abstract：To effectively predict and control the deformation of automobileengine hoods during the coating baking process，a combined approachof theoretical analysisand simulation modeling isemployed to investigate the mechanismsandfailuremodesof enginehood baking deformation.Mechanical modelsbased on2typesof failure modes—instantaneous instabilityand energyrebalancing—under thermo-mechanical coupling efectsareestablished， and a deformation predictionmethod is proposed.Theresultsindicate that therelative displacementcaused by the diffrence in thermal expansion between theinnerandouter panels，which islocked byadhesive curing，is themain cause of deformation.Thedeveloped simulation modelachievesa prediction accuracy of86.9% in critical areas of the engine hood，enablingquantitative evaluationand optimizationguidance fortheengine hood’sresistance to baking deformation during the design phase.

Keywords：Hood，BakedDeformation，PredictionModel

1前言

发动机罩烘烤变形是汽车制造过程中长期存在的技术难题，该问题会导致发动机罩外板型面凹陷、发动机罩与周边零部件的匹配间隙与面差不均等，严重影响整车外观品质1]。（剩余5911字）