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在值得修复的零件中,那些决定内燃机寿命的零件(如活塞销)占有特殊的地位。柴油机活塞销是用低碳铬镍钢或铬钢制造的,其外表面经渗碳淬火。修复活塞销的方法有镀铁、镀铬、等离子堆焊等多种。在一些汽车厂中,广泛应用着一种简单而新颍的修复汽车柴油机活塞销的方法,称为“水一热扩径法”。它主要包括扩大外径和表面渗碳层的淬火两道工序。如,将已磨损的外表面渗碳的12 CrNi 3A 钢活塞销,
Among the repairable parts, those that determine the life of the engine (such as piston pins) occupy a special place. Diesel piston pin is made of low carbon chromium nickel steel or chrome steel, the outer surface of the carburized quenching. Piston pin repair methods are plated iron, chrome, plasma surfacing and other. In some automotive plants, a simple and new method of repairing a piston pin for a motor vehicle diesel engine is widely used, known as the “water-heating expansion method.” It mainly includes two steps of enlarging outer diameter and surface carburized layer. For example, the wear of the outer surface of the carburized 12 CrNi 3A steel piston pin,