最近,由于越来越多地使用带有硬质杂质的低级船用燃料,引起了活塞环和环槽异常磨损的广泛性问题。为应付这一情况,Yanmar公司于3年前开始研究和发展激光淬硬装置,并成功地发展了一种活塞环槽二氧化碳激光淬硬技术。这种工艺技术已于去年用于批量生产的中等和大型发动机,包括Yanmar M200型中速6缸柴油机(功率450～670kW,转速720～1000r/min),见图1。 Recently, due to the increasing use of low-grade marine fuel with hard impurities, there has been a widespread problem of abnormal wear of piston rings and ring grooves. To cope with this situation, Yanmar started researching and developing laser hardening equipment three years ago and has successfully developed a piston ring groove carbon dioxide laser hardening technology. This process technology was used in medium and large engines for mass production last year, including the Yanmar M200 mid-speed 6-cylinder diesel engine (450-670 kW at 720-1000 r / min).