摘要
电弧增材制造技术是制备点阵结构的有效方法。研究了点阵结构电弧增材制造装备、铝基药芯焊丝设计与制备技术、激光约束电弧工艺和点阵杆件直径、角度控制方法,制备了典型点阵结构示范件。点阵结构电弧增材制造装备由增材制造单元、激光单元与监测单元组成。设计自生Al_(2)O_(3)相铝合金药芯丝材Al-Cu-NiO合金体系,制备出直径1.2 mm的药芯丝材,堆积杆件具有较低的热导率。激光激发大量中性粒子电离,使电弧中的带电粒子大幅度增加,对电弧存在约束和稳定作用,提高成形精度。控制电弧增材制造熔滴体积与个数,可制备直径为2.5~7.0 mm的点阵单元杆件。控制电弧增材制造电弧枪纵向与横向运动量,可制备角度为15°~90°的点阵单元杆件。利用点阵结构电弧增材制造技术实现了平面点阵结构、圆柱面点阵结构和曲母线面点阵结构的高精度成形,点阵结构的平均压缩强度为58.53 MPa,具有较高的承载性能。在点阵测试件的上表面施加均匀热源,热源温度为500℃,时间600 s,测试件下表面温度约93℃,具有较高的隔热性能。
Wire arc additive manufacturing(WAAM)is an effective method for fabricating lattice structure.The WAAM equipment of lattice structure,the design and fabrication technology of Al-based flux-cored wire,the laser constrained arc process and the diameter and angle control method of lattice rod were studied.Typical lattice structure application parts were manufactured.The WAAM equipment of lattice structure is composed of additive manufacturing unit,laser unit and monitoring unit.The Al-Cu-NiO alloy system of in-situ Al_(2)O_(3)phase Al alloy core wire was designed.The core wire with a diameter of 1.2 mm was prepared,and the deposition rod had low thermal conductivity.Laser excites a large number of neutral particles to ionize,so that the charged particles in the arc greatly increase the arc,which has a restraining and stabilizing effect on the arc and improves the forming accuracy.By controlling the volume and number of droplets in WAAM,lattice unit rods with different diameters of 2.5~7.0 mm can be manufactured.By controlling the lift and offset between the layers of the welding torch during WAAM process,lattice unit rods with different angles of 15°~90°can be prepared.The high-precision forming of planar lattice,cylindrical lattice and curved busbar lattice structures is fabricated by using the lattice structure WAAM technology.The average compressive strength of the lattice structure is 58.53 MPa.The uniform heat source is applied to the upper surface of the lattice test piece.The heat source temperature is 500℃.When the heat source is applied for 600 s,the lower surface temperature of the test piece is about 93℃,which has high bearing performance and thermal insulation performance.
作者
郑博
余圣甫
禹润缜
李勇杰
唐论
ZHENG Bo;YU Shengfu;YU Runzhen;LI Yongjie;TANG Lun(School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《电焊机》
2023年第2期87-96,共10页
Electric Welding Machine
基金
“HY行动”项目(62402200601)
国家自然科学基金重大项目(51790174)。
关键词
金属点阵结构
电弧增材制造
铝合金
装备
药芯丝材
metal lattice structures
wire arc additive manufacturing
aluminum alloy
equipment
powder core wire
