CAJ | 학술논문

基于中空激光光内同轴送粉的激光快速成形工艺，对光粉耦合原理进行了分析。光内同轴送粉成形过程中，粉流稳定易控，光粉耦合性好，且金属粉末的有效利用率远高于传统光外送粉工艺。通过改变占空比和离焦量，得出两者分别对能量分布密度的影响，为工艺试验参数的选择提供依据。运用ANSYS有限元分析软件，对环形中空激光熔池三维流场和温度场进行了分析，环形中空光内熔池具有两对四环对流特点。随着熔覆层高度的增加，基板和熔池的温度会越来越高；激光束在基板和熔覆层表面经过的距离越长，温度场也发生明显变化，时间越长，温度越高。
기우중공격광광내동축송분적격광쾌속성형공예，대광분우합원리진행료분석。광내동축송분성형과정중，분류은정역공，광분우합성호，차금속분말적유효이용솔원고우전통광외송분공예。통과개변점공비화리초량，득출량자분별대능량분포밀도적영향，위공예시험삼수적선택제공의거。운용ANSYS유한원분석연건，대배형중공격광용지삼유류장화온도장진행료분석，배형중공광내용지구유량대사배대류특점。수착용복층고도적증가，기판화용지적온도회월래월고；격광속재기판화용복층표면경과적거리월장，온도장야발생명현변화，시간월장，온도월고。
The coupling principle of laser beam and powder is analyzed based on laser rapid prototyping technology of the hollow coaxial powder feeding. In the forming process of inside-laser coaxial powder feeding, the powder flow is stable and easy to control, and the coupling of laser beam and powder is good. Besides, the effective utilization of the metal powder is much higher than conventional powder feeding cladding process. By changing the duty cycle and the defocus amount, their influence on the energy distribution density was obtained respectively, and it provided a basis to the choice of test parameters in the process. The article also made simulation of flow field and temperature field of the molten pool using the finite element analysis software ANSYS. The molten pool of ring hollow laser beam has the feature of two pairs of tetracyclic convection. As the height of laser cladding layers increases, the temperature of the substrate and the molten pool becomes higher and higher. As the distance of the laser beam running along the substrate and the cladding layers becomes longer and longer, the temperature field of the pool changes significantly. And as time goes, the temperature becomes much higher.