近来,在船用柴油机中增多了对劣质柴油的使用,由于这种油内含有硬的杂质,导致了活塞环和活塞环槽不正常的磨损问题。为了解决这个问题洋马柴油机厂已经成功地开发出一种二氧化碳激光束环槽淬火技术。这种处理方法已于去年应用到中速机和大型机的大量生产中,包括在洋马 M200型柴油机生产上应用。洋马 M200型机是六缸机,在转数为720至1,000转/分时,功率输出为450至670千瓦。此型机的活塞是由球墨铸铁制成,活塞环槽宽度只有4.5毫米,相当狭小。因此,使用 Recently, there has been an increase in the use of inferior diesel oil in marine diesel engines, which has caused abnormal wear of the piston ring and the piston ring groove due to the hard impurities contained in this oil. In order to solve this problem Yanmar Diesel Engine Factory has successfully developed a carbon dioxide laser beam groove quenching technology. This approach was applied last year to the mass production of medium speed machines and mainframes, including the Yanmar M200 diesel engine. The Yanmar M200 is a six-cylinder machine with a power output of 450 to 670 kW at 720 to 1,000 rpm. This type of machine piston is made of ductile iron, piston ring groove width of only 4.5 mm, quite small. Therefore, use