Thermal sensing and heat input control for thin-walled structure building based on numerical simulation for wire and arc additive manufacturing
Thermal sensing and heat input control for thin-walled structure building based on numerical simulation for wire and arc additive manufacturing
复制标题
DOI：
10.1016/j.addma.2020.101357
复制
发表时间：
2020-10-01
影响因子：
11
通讯作者：
Sasahara, Hiroyuki
中科院分区：
文献类型：
--
作者：
Abe, Takeyuki;Kaneko, Jun'ichi;Sasahara, Hiroyuki
在线和弧增材制造工艺中，由重复沉积工艺引起的累积温度升高降低了构建结构的尺寸精度。当构建结构的温度增加时，沉积的金属宽度增加，而高度减小。在这种情况下，使用较低热输入条件是有效的，因为熔池附近的温度可以局部地较低并且熔池尺寸可以减小。因此，可以增加构建结构的高度，并且可以改善沉积金属宽度的均匀性。本文提出了一种供热工况控制系统。该系统根据建筑结构的温度控制从焊接电源施加的电压-热输入条件。在沉积过程中，使用辐射温度计测量该结构的温度。为了确定最佳电压值，通过数值模拟来估计构建结构温度与沉积金属形状之间的关系。根据不同预热温度和热输入条件的模拟结果推导出最佳热输入条件。通过使用数值模拟，实验的数量可以最小化。为了评估所提出的方法，薄壁结构，并测量其轮廓。通过使用所提出的方法，成功地提高了构建的准确性。
In the wire and arc additive manufacturing process, the cumulative temperature increase caused by the repeated deposition process reduces the dimensional accuracy of the build structure. When the temperature of the build structure increases, the deposited metal width increases, while the height decreases. In this case, using a lower heat-input condition is effective because the temperature near the molten pool can be locally lower and the molten pool size can decrease. Thus, the height of the build structure can increase, and the uniformity of the deposited metal width can be improved. In this paper, a heat-input condition control system is proposed. This system controls the voltage-a heat input condition-which is applied from the welding power source according to the temperature of the build structure. The temperature of this structure is measured using a radiation thermometer during the deposition process. To determine the optimal voltage value, the relationship between the build structure temperature and the deposited metal shape is estimated by a numerical simulation. The optimal heat input condition is derived based on simulation results with varying preheat temperatures and heat input conditions. By using numerical simulations, the number of experiments can be minimized. To evaluate the proposed method, a thin-walled structure was built, and its profile was measured. The accuracy of the build was successfully improved by using the proposed method.