The quenching process of ball screws usually includes preheating, quenching, tempering and cooling. 

1. Ball screw preheating process: Preheating is a key step before quenching, aiming to heat the ball screw to above the quenching temperature, so that its structure and chemical composition are evenly distributed and internal stress is eliminated. The preheating temperature is generally determined according to the type and specification of the specific material, usually around 850℃, and the preheating time is generally 2-4 hours.

2. Ball screw quenching process: Quenching is a key step in the heat treatment of ball screws, and a hardened layer is formed on the surface of the screw through rapid cooling. The selection of quenching medium is crucial, and water, oil, brine and other media with sufficient heat dissipation capacity are generally selected. The temperature and time must be strictly controlled during the quenching process to avoid cracks and deformation.

3. Ball screw tempering process: Tempering is a necessary process after quenching, aiming to eliminate quenching stress and improve the toughness and strength of the ball screw. The tempering temperature is generally 350-500℃, and the time is 1-2 hours. Through tempering, the organizational structure of the screw can be further adjusted to achieve the desired performance.

4. Ball screw cooling process: Cooling is the last step of the quenching process, which aims to prevent the surface oxidation and discoloration of the screw, while ensuring that its surface hardness and organization reach the best state. The cooling medium is generally air or water cooling.