摘要
针对金属熔融涂覆成形过程中出口流量难以控制、沉积层尺寸误差较大等问题,对2024铝合金熔体在涂覆喷头内的流场与压力场进行数值分析。涂覆喷头内熔体的速度与压力云图表明,流场突变主要集中在出口狭窄流道内。由于涂覆喷头出口颈缩部位起耗能泄压的作用,在相同条件下当出口直径从0.3 mm增大到0.5 mm时,金属熔体最大速度增加。为保证出口流量的稳定,坩埚内金属熔体上方的气压补偿值应等于液面下降引起的压降。
Aiming at the problems that the outlet flow is difficult to control,and the deposition layer size error is large during metal fused coating process,the flow field and pressure field of 2024 aluminum alloy melt in the coating nozzle were numerically analyzed.The velocity and pressure cloud diagrams show that sudden changes of flow field are mainly concentrated in the narrow channel of the outlet.Since the necked part of the nozzle can consume energy and relieve pressure,the maximum velocity increases when the outlet diameter increases from 0.3 mm to 0.5 mm under the same conditions.In order to ensure the stability of outlet flow,the pressure compensation value of the molten metal in the crucible should be equal to the pressure loss caused by liquid level drop.
作者
赵光喜
杨先海
谭帅
刘焕宝
ZHAO Guangxi;YANG Xianhai;TAN Shuai;LIU Huanbao(School of Mechanical Engineering,Shandong University of Technology,Zibo 255000,China;Shengli Oilfield Highland Petroleum Equipment Company,Dongying 257091,China)
出处
《热加工工艺》
北大核心
2023年第24期95-98,共4页
Hot Working Technology
关键词
熔融涂覆
增材制造
流场
压力场
fused coating
additive manufacturing
flow field
pressure field
