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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1.5~2.5 g/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400 W和送粉量2.0 g/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580 HV的微细熔覆道,经后续磨、铣削及少量抛光,制作出高0.1 mm,宽0.3 mm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60~75 min。
Using JK1002 type Nd: YAG laser, simultaneous delivery powder system, the plastic mold steel HPM75 matrix, clad 316L stainless steel powder, direct forming microchannel mold. The influence of powder feeding on the geometry of clad road was studied. The influence of the combination of powder feeding and laser power on the quality of cladding was investigated. The results show that the fine cladding lanes that meet the requirements of the geometry of the microchannels are obtained with the feeding capacity of 1.5-2.5 g / min. When the laser power is 400 W and the feeding amount of powder is 2.0 g / min, the cladding layer with good cladding quality Fine cladding road. The CAD-Mastercam software is used to plan the laser scanning and forming path of the microchannel mold with specific shape. Multi-layer cladding forming experiment is carried out with the optimized combination of parameters to form a compact and finely-welded tunnel with a hardness of 580 HV. After subsequent grinding and milling And a small amount of polishing, to produce a 0.1 mm high, 0.3 mm wide cladding road to meet the technical requirements of the micro-channel mold samples, the total time required to produce a mold 60 ~ 75 min.