Quenching can improve the quality of plastic molds and is a heat treatment technology often used in processing. Quenching mainly involves heating the metal material to a temperature sufficient for phase change and then keeping it warm, then rapidly cooling it at a rate greater than the critical cooling rate to obtain a martensitic structure, and then tempering it at different temperatures to obtain the required mechanical properties.

The quenching temperature should take into account the shape, size and original structure of the mold. In order to ensure that the martensitic structure can be obtained after quenching, it is necessary to obtain uniform and fine austenite crystals as the basic principle, and the heating temperature is determined according to the critical point of the mold steel.

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The quenching time generally calculates the workpiece's growth and insulation together. There are many factors that can affect the quenching heating time, including the main components and characteristics of the mold, the shape and size of the heated workpiece, and the heating medium.

The cooling rate of quenching normally needs to be greater than the critical cooling rate, but too high a speed will increase the stress in the workpiece, causing it to deform or crack. Therefore, it is necessary to select a suitable quenching medium, commonly used aqueous solutions and mineral oils. The mold can also be quenched in the air.

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