Diesel engine piston manufacturing (manufacture of diesel locomotive diesel engine piston manufacturing process is diesel piston). The piston is transmitted to the crankshaft through a connecting rod functions generated in the combustion process of fuel used to play the role of connecting the output from a diesel engine, in the engine. The other piston also together form with the other components combustion chamber, and to ensure a dynamic seal between the combustion chamber and crankcase.
    Diesel locomotive diesel engine piston type forged-aluminum pistons, piston integrally cast ductile iron piston, steel top iron skirt combination.
    The forged-aluminum pistons First forged aluminum cover and aluminum body hair Pooh guarantee the fibrous tissue of the sets of aluminum and aluminum body. After finishing rough machining, heat treatment, aluminum cover and aluminum body suit diameter to ensure interference requirements of the two sets of aluminum package aluminum body process through a special "package" to form a complete piston. Combustion chamber profile machining, the peripheral line CNC machining, machining and other finishing eccentric ellipse. Forged-aluminum piston of the combustion chamber surface in order to improve the service life of the piston, the low-temperature anodic oxidation treatment (oxide film having a thickness of 0.01mm ~ 0.02mm), the pin hole roller strike strengthening, the piston skirt surface coating of MoS2.
    Integrally cast ductile iron piston, the key is the casting quality and the quality of the sand cleaning.
    Continue to strengthen with the diesel engine, forged aluminum pistons, and the whole cast ductile iron piston has failed to meet the requirements, replaced by steel top skirt of aluminum and steel top iron skirt combination piston. Its structure is the top of the piston skirt of the piston by a bolt (stud), the washer (elastic sleeve) are connected together. Piston top quality alloy steel 42CrMo, blanks made by forging molding process. Density, expansion coefficient, high dimensional stability, high thermal conductivity and wear resistance of the eutectic silicon aluminum alloy aluminum piston skirt molding blanks, forging, ductile iron piston skirt made of high strength ductile iron casting into hair embryo. Composition the steel of the piston top is now primarily to the two structures, one head with four to avoid the valve pit, the other is not avoidance valve pit shallow W-shaped combustion chamber, which the stress is significantly lower than the former. Part of the aluminum skirt skirt type line becomes oval, convex and processed by a special three-dimensional copying lathe. Type line of and iron Qunqun Ministry is a simple oval and the outer surface of the tin-plated. Combination piston connecting pieces - bolt (studs), chosen 18Cr2Ni4V (or 40CrNiMo) alloy steel after electroslag re-melting the vacuum degassing strict processing. The thread rolling after the heat treatment system, thereby improving the fatigue strength.
    The geometry of the piston, the piston top, piston skirts, Bolt, correctness, precision machining, surface roughness, line and position tolerances, assembly process has strict requirements, which is the important measures to ensure the reliable operation of the piston.