电加工与模具
電加工與模具
전가공여모구
ELECTROMACHINING & MOULD
2014年
4期
46-53
,共8页
激光熔覆%激光功率%衰减%熔池%熔覆带横截面轮廓
激光鎔覆%激光功率%衰減%鎔池%鎔覆帶橫截麵輪廓
격광용복%격광공솔%쇠감%용지%용복대횡절면륜곽
laser cladding%laser power%attenuation%molten%cross section outline of cladding zone
通过理论和试验研究了激光熔覆过程中粉末流对激光功率的衰减、激光熔覆所需的激光功率及形成熔池的宽度、形貌、熔覆带横截面轮廓等。试验结果发现：在激光熔覆过程中，粉末对激光功率的衰减程度取决于送粉率、气流速度、激光束、粉末流的发散角、腰斑的位置与直径、粉末颗粒直径和激光束穿过粉末流的深度；激光功率下限值与光斑直径、扫描速度及材料熔点等热物理特性有关；在一定的简化条件下，激光单道熔覆形成的熔池宽度是工艺参数和材料特性的函数，较低功率的激光在基板上熔覆时，熔覆带横截面轮廓上各点的高度由粉末浓度分布及熔池内相应点处于液态的时间决定。
通過理論和試驗研究瞭激光鎔覆過程中粉末流對激光功率的衰減、激光鎔覆所需的激光功率及形成鎔池的寬度、形貌、鎔覆帶橫截麵輪廓等。試驗結果髮現：在激光鎔覆過程中，粉末對激光功率的衰減程度取決于送粉率、氣流速度、激光束、粉末流的髮散角、腰斑的位置與直徑、粉末顆粒直徑和激光束穿過粉末流的深度；激光功率下限值與光斑直徑、掃描速度及材料鎔點等熱物理特性有關；在一定的簡化條件下，激光單道鎔覆形成的鎔池寬度是工藝參數和材料特性的函數，較低功率的激光在基闆上鎔覆時，鎔覆帶橫截麵輪廓上各點的高度由粉末濃度分佈及鎔池內相應點處于液態的時間決定。
통과이론화시험연구료격광용복과정중분말류대격광공솔적쇠감、격광용복소수적격광공솔급형성용지적관도、형모、용복대횡절면륜곽등。시험결과발현：재격광용복과정중，분말대격광공솔적쇠감정도취결우송분솔、기류속도、격광속、분말류적발산각、요반적위치여직경、분말과립직경화격광속천과분말류적심도；격광공솔하한치여광반직경、소묘속도급재료용점등열물리특성유관；재일정적간화조건하，격광단도용복형성적용지관도시공예삼수화재료특성적함수，교저공솔적격광재기판상용복시，용복대횡절면륜곽상각점적고도유분말농도분포급용지내상응점처우액태적시간결정。
Attenuation of powder flow on laser power,laser power and width,appearance,cross section outline of cladding zone required by laser cladding are studied in the theory and experiment. The experimental results show that in the caurse of laser cladding ,degree of powder attenuation on laser power depend on the powder feeding efficiency,air flow rate,scattered angle of laser beam and powder flow,position and diameter of waist spot,powder diameter,depth of laser beam shot into powder flow. The lower limit volue of laser power relate to rot physical natures ,such as the spot diameter ,the scanning rate and the melting point of material. Under the certain simplified condition ,molten width by laser single way cladding is function of the process parameter and the material characteristics. Cladding by lower laser power,height of each points on cross section outline of cladding zone depend on the distribution of powder consistency and time placed in liquid state on corresponding points of molten.
