| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the fatigue failure of the circumference of the flange of a cylinder liner in the cast iron cylinder liner, by forming the sliding part of the cylinder liner from a perlite texture, and forming a non-sliding part from a bentonite texture. SOLUTION: A cylinder liner comprises a cylinder 2 and a flange 3, and a abrasion relief groove 4 is arranged under the flange 3. The flange 3 is tightened between a cylinder head and a cylinder block. Therefore, rupture occurs easily by action of tightening force and action of repeating stress per process of an engine. Hereupon, the flange 3, the abrasion relief groove 4 and their circumferential part 8-1 are heat treated so as to be a bentonite texture. When this heat treatment is executed, while a cylinder liner inner circumferential surface 5 is cooled by cooling water from a cooling pipe 10, current is applied to a high frequency coil 9, and a part 8 is heated by induction heating, thus, this part 8 is made to be an austenite texture. Next, air is sprayed to a heated part so as to be air-cooled, thus the heated part is made to be a bentonite texture.</p> |
