Of rollers used in high frequency induction hardening is a process. High-frequency induction hardening of rollers heat treatment process, not only able to extend the service life of rolling wheel, but also greatly shorten the heat treatment process, and improve labor productivity, in line with the requirements of energy saving and environmental protection. This method have more advantages than the salt bath and box-type furnace heating has been used in many factories.
（1） rolling round of the advantages of high-frequency induction
High frequency induction heating effect of current thread roller surface is rapidly heated, the heat is highly concentrated in the surface of the gear hobbing. High frequency induction heating process specifications due to the strong radiation of the heat conduction to the cold heart of the Ministry of heating temperature and time control, and power input sizing the heating process.
（2）Induction loop specifications
Of rollers at the same time heating/min speed of rotation in order to prevent the induction loop in the center of the rolling wheel offset centerline, 200-350 turn, when heated to quenching temperature, quenching immediately removed from the sensor . The sensor design of rollers hardened layer depth, distribution, deformation and heating efficiency has a direct impact on the rolling wheel diameter size suitable sensor can make heating uniform heating and expansion.
(3) the heating temperature
Heating temperature is relatively process and along rolling round cross-section temperature distribution, also affect the size of the after quenching deformation.
(4) the cooling medium
The cooling medium using the 300-320 ° C the nitrate bath temperature and 10min after bath air-cooled, small deformation.
5 of rollers bore high-frequency induction hardening and tempering
Spiral bore quenching sensor, with intermittent way to power about 0.5mm depth of heating to about 1050 ℃, the air cooling of the inner hole, and then 480-500 ℃ X2h tempering heat treatment hardness ≥ 45HRC, within the hole. narrow 0.03-0.05mm, after grinding to achieve the pattern size requirements. Bore quenching and tempering arrangement before the thread roller cone quenching.
Quenching roll silk round the tempering
After high frequency induction hardening of rollers, than the ordinary tempering at lower temperature (120-140 ° C) tempering, it can guarantee a high hardness after quenching, they would not affect the toughness.
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