1 前言 Federal Mogul公司Friedberg工厂专门研制直径145～640mm活塞环,为四冲程中速柴油机、气体和双燃料发动机提供配套。活塞环基本的制造工艺是采用底注式技术生产片状石墨铸铁、灰铸铁、球墨铸铁活塞环铸坯,初级机加工(主要是磨削)、涂覆和热处理,以及为达到所要求的活塞环形状的精磨。活塞环开发的主要侧重点是改进外形、优化外 1 Introduction Federal Mogul’s Friedberg plant specializes in piston rings 145 to 640 mm in diameter and is available for four-stroke medium-speed diesel, gas and dual-fuel engines. The basic manufacturing process for piston rings is the production of flake graphite cast iron, gray cast iron, nodular cast iron piston ring billets, primary machining (mainly grinding), coating and heat treatment, and the use of bottom-in-pin technology to achieve the required piston Ring-shaped grinding. The main focus of piston ring development is to improve the appearance, optimization of the outside