大尺寸支承板钛合金铸件铸造工艺研究

Research on the Casting Process of Large-scale Support Plate Titanium Alloy Casting

某大型钛合金铸件,工件为大尺寸支承板。板上有大量凸台,板下有许多纵横交错的筋板,属于典型的超大型薄壁复杂平板框架结构件。因尺寸巨大,无法通过常规的热等静压等手段保证铸件内部质量,只能通过对其铸造工艺进行分析和优化来保证。对该大尺寸钛合金支承板铸件结构进行分析后,设计了不同的铸造工艺。采用华铸CAE铸造工艺分析软件,对该结构件在不同浇注工艺下进行石墨型铸造模拟,对其成型过程进行工艺分析和质量预测。铸造模拟结果表明,不同的浇注工艺显著影响铸件内部的缺陷大小及位置分布。根据CAE模拟结果,对铸件的铸造工艺进行了优化。采用优化的铸造工艺浇注铸件,并对铸件进行X射线检测。结果表明,铸件成型完整、无明显表面缺陷,X射线检测结果显示其内部缺陷分布与铸造模拟结果基本吻合。

A large-scale titanium alloy supporting plate,with many bosses on it and many ribbed panels of length and breadth,is a large thin-wall complex plate frame structure.Owing to its large scale,the interior quality cannot be assured by conventional means such as hot isostatic pressing,which can be guaranteed only by analysing and optimizing the casting process.After the structure was analysed,different casting processes were designed.Graphite mould casting was simulated with different pouring processes on the basis of Huazhu CAE software.The forming process of the casting was then analysed and predicted.The simulation results indicate that the distribution of defects in the casting is significantly affected by different pouring processes.On the basis of the CAE simulation results,the casting was poured via the optimized casting process and then inspected via X-ray.The results show that the casting is completely formed without obvious surface defects.Moreover,the X-ray inspection results reveal that the distribution of interior defects in the casting is basically consistent with the casting simulation results.