应用激光, 2015, 35 (4): 428, 网络出版: 2015-12-18
分区扫描对激光沉积制造钛合金温度场的影响
In fluence of Separate Area Scanning on the Temperature Field of Laser Deposition Manufacturing of Titanium Alloy
分区扫描 薄壁件 温度场 变形 激光沉积制造 separate area scanning thin-wall temperature field distortion laser deposition manufacturing
摘要
为降低激光沉积制造BT20钛合金薄壁零件中的应力与变形, 研究了激光沉积方式对薄壁零件温度场及基体变形的影响。通过建立薄壁零件三维温度场的有限元模型, 对比分析了连续扫描和分区扫描两种扫描方式下温度场、节点热循环、温度梯度的分布规律。模拟和实验结果表明, 采用连续扫描沉积方式下, 薄壁零件热量累积较大, 温度梯度分布不均匀, 引起基体两端产生较大的挠曲变形; 采用分区扫描沉积方式下, 薄壁零件热量累积显著降低, 温度梯度分布相对均匀, 基体挠曲变形较小。
Abstract
In order to decrease the stress and distortion of the BT20 titanium alloy thin-wall structures in the laser deposition manufacturing, the effect of scanning methods on temperature field and substrates distortion of thin-wall structures is investigated by numerically and experimentally. The distribution of temperature field, the node temperature gradient and the performance of node thermal cycle are analyzed comparatively under separate area scanning and sequential area scanning methods by establishing the three-dimensional mathematical model for temperature field. The results indicated that the thermal accumulation in sequential area scanning is higher than separate area scanning, the temperature gradient distribution is not uniform in sequential area scanning, which leads to bending deflection in both sides of thin-wall structures. However, in separate area scanning method, the thermal accumulation significantly reduce, the temperature gradient distribution is relatively uniform, and the substrates distortion is lower.
杨光, 周佳平, 钦兰云, 王维, 卞宏友, 丁林林. 分区扫描对激光沉积制造钛合金温度场的影响[J]. 应用激光, 2015, 35(4): 428. Yang Guang, Zhou Jiaping, Qin Lanyun, Wang Wei, Bian Hongyou, Ding Linlin. In fluence of Separate Area Scanning on the Temperature Field of Laser Deposition Manufacturing of Titanium Alloy[J]. APPLIED LASER, 2015, 35(4): 428.