| 摘要 |
PURPOSE: A heat treatment method of a board for a clutch is provided to enhance durability and productivity by saving heat treatment time and to save costs by reducing the use amount of electricity, propane, ammonia and methanol. CONSTITUTION: A board for a clutch is preheated at 910 to 930 deg C for 10 minutes(11). The board is carbonitride-treated for 30 to 50 minutes while keeping the temperature. The board is carbonitride-treated at 860 to 890°C for 5 to 20 minutes(12). After passing through a carbonitride treatment process, the board is rapidly cooled(13). Then, the board is tempered at 180 to 220°C for 60 minutes and cooled at a room temperature(14).
|
