中文摘要：

采用JK1002型Nd：YAG激光器、同步送粉系统，在塑胶模具钢HPM75基体上，熔覆316L不锈钢粉末，直接成形微流道模具。研究送粉量对熔覆道几何尺寸的影响，研究稳定送粉状态下送粉量与激光功率组合对熔覆质量的影响。结果表明，送粉量1．5～2．5g／min，获得满足微流道模具几何尺寸要求的微细熔覆道；激光功率400W和送粉量2．0g／min组合，获得具有较好熔覆质量的微细熔覆道。采用CAD-Mastercam软件，规划特定形状微流道模具的激光扫描成形路径，采用优化的参数组合进行多层熔覆成形实验，成形出致密、硬度580HV的微细熔覆道，经后续磨、铣削及少量抛光，制作出高0．1mm，宽0．3mm的熔覆道，满足工作技术要求的微流道模具样件，制作1件模具总耗时60～75min。

英文摘要：

Laser cladding on JK1002 Nd： YAG laser and the synchronous powder feeder are performed to fabricate micro-fluidic channels mold. Substrate material is HPM75 steel and clad powder is 316L stainless steel. Influences of the powder feed rate on clad layer geometrical dimensions and the combination of laser power and powder feed rate with stable state of powder feeding on clad quality are investigated. Results show that the range of 1.5-2.5 g/min of powder feed rate obtains micro clad layers which meet geometrical dimensions＇ requirement of micro-fluidic channel mold and combination parameters of laser power of 400 W and powder feed rate of 2.0 g/min make micro clad layer with good clad quality. Scanning paths of micro-fluidic channel mold with specific shape are planned by CAD- Mastercam software. Using optimum parameters combination, multilayer laser cladding experiment is carried out and a sample of micro-fluidic channels mold is fabricated with dense structure and hardness of 580 HV. A little milling and polishing makes the sample meet the requirement of mold. Sizes of the final sample are 0.1 mm in height and 0.3 mm in width. The mold fabricating time is 60-75 min totally.