锻压技术

复杂热冲压模具型面的激光熔覆强化及摩擦磨损控制技术

英文标题：Laser cladding strengthening of complex hot stamping die surface and friction and wear control technology

分类号：TN249；TH117.1

出版年,卷(期):页码：2024,49(3):186-193

摘要：

由于服役条件恶劣，热冲压模具的工作型面容易产生磨损与裂纹，而传统强化方式在减小模具磨损的同时存在诸多限制。为了实现复杂模具型面的熔覆，通过机械手和变位机变姿实现了激光熔覆路径优化，并采用差温往复式摩擦磨损实验装置模拟了热冲压工况，分析了激光熔覆层的摩擦磨损性能。研究结果表明，铁基粉末与钴基粉末两种熔覆层均能有效减小摩擦因数与模面磨损量，其中Stellite 12钴基粉末的激光熔覆层的摩擦因数与磨损量最小。扫描电子显微镜观测发现，Fe901铁基粉末与Stellite 12钴基粉末的激光熔覆层表面出现的氧化层与化合物起到了润滑减磨作用，实现了模面磨损控制。

ue to the bad service condition, the working surface of hot stamping die is easy to be worn and cracked, and the traditional strengthening methods have many limitations while reducing the die wear. Therefore, in order to achieve the cladding of complex die surface, the laser cladding path was optimized by changing the posture of manipulator and positioner, and the hot stamping condition was simulated by the differential temperature reciprocating friction and wear experimental device to analyze the friction and wear properties of laser cladding layer. The research results indicate that both cladding layers of Fe-based powder and Co-based powder effectively reduce the friction factors and the wear amount of die surface, and the laser cladding layer of Stellite 12 Co-based powder has the smallest friction factor and wear amount. Scanning electron microscopy observation reveals that the oxide layer and compound on the surfaces of laser cladding layers for Fe901 Fe-based powder and Stellite 12 Co-based powder play a role in lubricating and reducing wear, achieving the wear control of die surface.

基金项目：

2022年度无锡市“太湖之光”科技攻关（产业化关键技术攻关）项目（WX0304B010301220019PD）

作者简介：陈炜（1965-），男，博士，教授，E-mail：chen_wei@ujs.edu.cn

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