Thread rolling wheel processing and heat treatment quenching process

Thread rolling wheel used in high frequency induction hardening is a new technological process. Thread rolling wheel method of using high frequency induction hardening heat treatment process, and can not only prolong the service life of screw rolling wheel, but also can greatly shorten the heat treatment process, and improve labor productivity, in line with the requirements of energy conservation and environmental protection. This method has more than salt bath and box-type furnace heating superiority, has been adapted for use by many factories. 1. Thread rolling wheel high frequency induction heating effect of the advantages of high frequency induction current, fast thread rolling wheel surface heating, heat concentration in the roll teeth surface. Due to the intensity of the heat radiation and the conduction of cold heart, so the high frequency induction heating process specification is to control the heating temperature and heating time, and adjust the heating process according to the size of input power. 2. Specifications of induction coil, the influence of screw rolling wheel with the method of heating at the same time, in order to prevent the thread rolling round the center of the induction coil, the center of the migration should be 200 - Rotate at a speed of 350 r/min, when heated to a temperature of quenching temperature, immediately remove quenching from the sensor. Sensor design of screw rolling wheel, deformation distribution of the hardening layer depth, and the heating efficiency has a direct impact, suitable sensors can make thread rolling wheel diameter size in heating uniformly heated and expansion. 3. Heating temperature heating temperature affects the relative process and the influence of the temperature distribution of the section, screw rolling wheel at the same time also affect the quenching deformation of the size. 4. Using 300 - cooling medium cooling medium 320 ℃ nitrate bath, isothermal air cooling after 10 min tub, little deformation. 5. Thread rolling wheel inner hole of high frequency induction hardening and tempering adopting spiral inner hole quenching inductor, with intermittent to electricity make the inner hole is about 0. 5 mm deep heated to 1050 ℃ or so, air cooling, and then 480 - After 500 ℃ X2h tempering, heat treatment hardness or 45 HRC, inner hole shrink 0. 03 - 0. 5 mm, to fulfill the requirements of pattern size after grinding. Inner hole quenching tempering arrangement before the thread rolling wheel roller quenching. 6. Thread rolling wheel quenching tempering after high frequency induction quenching of screw rolling wheel, than ordinary tempered with lower temperature ( 120 - 140℃） Tempering, so we can assure the high hardness after quenching, without impact toughness.