问题的提出建筑机械的工作环境十分恶劣，机件较容易磨损，维修时经常要更换不少失效零件。这些零件大多数是局部损坏或表面丧失某些技术性能，只需经过恰当的修理工艺就能修复。这与制造或新购零件相比，其修旧成本费用相对较低，尤其对价格昂贵、形状复杂的大型零部件经济效? Problems raised The construction machinery work environment is very bad, the parts are easy to wear, often need to replace a lot of failed parts. Most of these parts are partially damaged or the surface loses certain technical properties and can be repaired only by proper repair processes. Compared with manufacturing or newly purchased parts, the cost of repairing and repairing is relatively low, especially for the economic efficiency of large parts with high prices and complex shapes.