Medium frequency induction heating and quenching heat treatment process for gear hob

The gear hob is an important gear cutting tool. From its name, we can see that it is mainly a cutting tool, and it needs to bear huge friction during the working process. In order to meet the needs of their work, many gear hob manufacturers use intermediate frequency induction heating machines to perform some heat treatment on them. Today, I will tell you about the intermediate frequency heat treatment process of the gear hob.

Gear hobs are generally made of general-purpose high-speed steel, with a hardness requirement of 64-66.5HRC, and there are also requirements for carbide unevenness, preferably ≤3 grades. The gear hob made of M2 steel is under the heat treatment process.

(1) Preheating. Select a special quenching fixture, and use a medium frequency induction heating machine for preheating heat treatment. The preheating time is twice the heating time, and the heating temperature is 850-870°C.

(2) Heating. The gear hob is heated and heat-treated by a medium-frequency induction heating machine. The heating temperature is 122-1235°C, and the heating time is shown in Table 2-103. The crystallinity is controlled at 9.5-10 grades, and 1-2 grades of overheating are allowed.

Gear hob heat treatment process parameters

Dimensions (modulus) m/mm 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5

Heating time/S 200 220 230 250 260 270 280 300 330 350

(3) cooling. After heating at high temperature, pre-cool in air for a few seconds before quenching. For gear hobs with modulus <5, medium frequency induction heating machine is used for quenching heat treatment, and the temperature is 580-620°C and 450°C for two classifications.

(4) Tempering. Its tempering heat treatment can also be carried out on a medium frequency induction heating machine, 550 ℃ x lh x 4 times of tempering, and austempering requires 4 times of tempering.

As a kind of gear cutting tool, the gear hob is widely used in daily life. Zhengzhou Gou's has been engaged in the production and sales of medium frequency induction heating machines for more than 15 years, and has rich experience in the heat treatment of workpieces. If you want to know more detailed questions, please contact us.