犁铲是农机的基础件,量大面广,它在田间作业时与土壤和砂石产生摩擦而迅速磨损。据农垦部1966年以前的统计,我国一年中仅犁铲一项约需消耗优质钢6～7万吨,平均一块犁铲只能翻两千亩地就将磨损得不能再修复而报废。由于犁铲磨损 Plow shovel is the basic part of agricultural machinery, a large amount of wide area, it works in the field with the soil and gravel friction and rapid wear and tear. According to the statistics of the Ministry of Land Reclamation before 1966, only one plow shovel in China needs to consume about 60,000 to 70,000 tons of high-quality steel, and the average one-piece shovel can only be rented out for two thousand mu. As plowshare worn