kaksinkertainen keskikarkaisu

Dual-medium sammutus: The workpiece heated to the quenching temperature is first cooled to the Ms point in a quenching medium with strong cooling capacity, and then transferred to a slow-cooling quenching medium to cool to room temperature to achieve different quenching cooling temperature ranges, and there are The ideal quenching cooling rate. It is used for complex shapes or large workpieces made of high carbon steel and alloy steel, and carbon tool steel is also mostly used in this method. Commonly used cooling media are water-oil, water-nitrate, water-air, oil-air. Generally, water is used as a quick-cooling quenching medium, oil or air is used as a slow-cooling quenching medium, and air is less used.