【摘要】：針對熔融擠出成形大型薄壁件時易出現(xiàn)變形、開裂的問題,提出采用激光束對成形區(qū)進(jìn)行輔助加熱以提高成形質(zhì)量和精度。采用計算流體動力學(xué)方法建立熔融擠出成形過程數(shù)值計算模型,對熔融擠出成形特征區(qū)域溫度歷程及三維形貌特征進(jìn)行分析與實驗驗證。研究了成形速度、激光功率、激光輔助加熱方式對成形區(qū)聚合物熔體表面溫度及粘度的影響。研究結(jié)果表明采用側(cè)向激光輔助加熱方式比前后置激光輔助加熱方式對粘接區(qū)域表面溫度提升更高;采用激光輔助加熱顯著提高了薄壁件抗拉強(qiáng)度,其最大提高幅度可達(dá)195%;采用激光輔助加熱后,成形件表面粗糙度有所降低,層間粘接寬度比先前提高近24%。
[Abstract]:In order to solve the problem of deformation and cracking of large thin-walled parts formed by melt extrusion, the laser beam is used to heat the forming zone to improve the forming quality and precision. A numerical model of melt extrusion forming process was established by using computational fluid dynamics (CFD) method. The temperature history and 3D morphology of melt extrusion forming were analyzed and verified by experiments. The effects of forming speed, laser power and laser assisted heating on the surface temperature and viscosity of polymer melt were studied. The results show that the surface temperature of bonding area is raised higher by laser assisted heating than that by laser assisted heating, and the tensile strength of thin wall parts is improved by laser assisted heating, and the maximum increase is up to 195. After laser assisted heating, the surface roughness is decreased, and the bonding width is increased by 24%.
【作者單位】： 西安交通大學(xué)機(jī)械制造系統(tǒng)工程國家重點實驗室;
【基金】：陜西省自然科學(xué)基金項目(2014JQ7238)
【分類號】：TH16

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