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运用6轴机器人及光内送粉技术进行弧形悬垂实体结构成形,提出了空间变姿态径向搭接方法:熔覆头沿圆弧切线方向连续变姿态,径向多道搭接。探讨了熔覆喷头堆高自适应区间,推导了离焦量在-5.5~-1.5 mm时,单道熔层生长量随离焦量变化的量化关系式,并加以实验验证。对成形悬垂实体件检测结果表明:成形件表面平整,过渡平缓无阶梯效应;不同倾角下成形件厚度长度均匀,各尺寸精度均接近建模要求;电镜组织分析表明不同倾角下各处显微组织均匀致密无明显差别。对成形件作硬度检测,其硬度分布与电镜组织保持相同变化规律。
A 6-axis robot and light powder feeding technology are used to shape the arc-shaped overhanging solid structure. A radial overlap method of the space-changing attitude is proposed. The cladding head changes continuously along the tangential direction of the circular arc and overlaps radially. The adaptive range of the heap height of the cladding nozzle was discussed. The quantitative relation between the growth of the single pass layer and the defocus amount was deduced when the defocus amount was between -5.5 and -1.5 mm, and the experiment was verified. The test results of the formed drape entity show that the surface of the formed part is smooth and the transition is smooth without step effect. The thickness of the formed part is uniform and the precision of each dimension is close to the modeling requirements under different inclinations. The microstructure of the microstructure shows that the microstructure Evenly dense no significant difference. For the hardness of the molded parts testing, the hardness distribution and electron microscopy organizations to maintain the same changes.