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联合收割机的键箱曲拐轴,用木瓦轴承,摩擦系数大,润滑条件恶劣,因此轴颈磨损严重(轴颈磨有凸台,椭圆度在2毫米以上)。如果将轴颈车圆,配缩小内孔的木瓦,强度会大大降低;如采用焊修,曲拐轴变形很大,且无法加工。修复键箱曲拐轴曾一度成了难题。后来根据尼龙轴承对钢铁有良好的耐磨性和自润性的特点,将尼龙直接压注在曲拐轴轴颈上,并适当改变了木瓦结构。实践证明这种修复工艺既简单又耐用。我们曾在九根需修复的CK—3键箱曲拐轴上作试验,经麦收、秋收脱谷作业,压注有尼龙耐磨层的轴颈磨损轻微,效果好。现将修复方法介绍如下:
Combine harvester key crankcase crankshaft, with shingles bearing, the friction coefficient, poor lubrication conditions, so serious wear on the journal (journals with boss, ellipticity of 2 mm or more). If the journal car round, with shrinkage small hole shingles, the strength will be greatly reduced; such as the use of welding repair, crankshaft deformation is large, and can not be processed. Repair button box crank axle once became a problem. Later, according to the nylon bearing on the steel has good wear resistance and self-lubrication characteristics, the direct injection of nylon in the crankshaft shaft journal, and the appropriate change shingles structure. Practice has proved that this repair process is simple and durable. We have to be repaired in the nine CK-3 key box crankshaft for testing, the wheat harvest, autumn harvest threshing operation, pressure injection with nylon wear-resistant layer of journal wear a slight, effective. Now repair methods are described below: