奥贝球铁凸轮表面激光强化的工艺研究与应用

Study and application of technology of hardening surface of austenite-bainite nodular-iron camshaft using laser

阐述用奥贝球铁代替 2 0Cr制造内燃机车凸轮轴的激光表面强化的工艺过程 ,其中包括奥贝球铁的选择、激光工艺参数的确定、螺旋激光扫描带、四联动微机控制装置的设计等。研究表明 ,用奥贝球铁代替 2 0Cr制造凸轮轴 ,经激光表面强化后 ,能获得更均匀的硬度分布和更高的硬度值。在与常用的GCr15挺杆滚子配合使用时 ,具有更好的材料匹配性 。

Technology of laser hardening surface of diesel locomotive camshaft using austenite-bainite nodular-iron instead of 20Cr has been systematically elaborated on,which includes a series of measurements such as mechanism of choosing austenite-bainite nodular-iron and it's pretreatment,ascertaining laser technological parameter,spiry laser scanning strip,designing four-motor control devise using microcomputer and so on. Findings indicate that obtains more satisfacctory hardening distribution and value after hardening surface using laser.In the meantime,it has better matchability when working with the typicical GCr15 tappet-roller,which effectively decreases or avoids the phenomena of pit corrosion and mar.