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Study on geometrical and dimensional changes in isothermal precision forging with complex shape during air cooling process

机译:空冷过程中复杂形状等温精密锻件几何尺寸变化的研究

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摘要

A series of experiments were made to analyse geometrical and dimensional changes of annaluminium alloy ring seat during the air cooling process. Geometrical and dimensional changesnwere measured by a structured light scanner. The corresponding microstructure evolution ofn7A09 aluminium alloy was characterised using thermal simulating experiment, X-ray diffractionnand transmission electron microscopy. Experimental results indicate that geometrical andndimensional changes are closely correlated with the shape of isothermal precision forging duringnthe air cooling process. The main reasons for distortions are non-uniform thermal field in thenworkpiece and inhomogeneity of the coefficient of thermal expansion caused by thenmicrostructure evolution.
机译:进行了一系列实验,以分析空气冷却过程中铝合金环座的几何和尺寸变化。几何和尺寸变化是由结构化的光扫描仪测量的。利用热模拟实验,X射线衍射和透射电镜对n7A09铝合金的组织演变进行了表征。实验结果表明,在空冷过程中,几何尺寸和尺寸变化与等温精密锻造的形状密切相关。变形的主要原因是工件中的热场不均匀以及由微观组织演变引起的热膨胀系数的不均匀性。

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