Although carburizing get hardening layer in the uniform distribution and quenching the stability and reliability of the quality has incomparable advantage, but in actual production process is long production period, heat treatment deformation big, and machining difficulty, clean sex differences, energy dissipation shortcomings. And carburizing of these defects, it is the induction heating the advantages of quenching technology. Therefore, how to reasonable use induction heating quenching technology, is an urgent subject.
Along with the computer technology intervention carburizing process, carburizing quench furnace atmosphere have an accurate in carbon control, thus make the carburizing hardened hardening layer uniformity, the depth of hardening layer, quenching the stability of quality and reliability can be guaranteed. Together with the domestic, especially heavy manufacturing industry introduced nc forming large-scale gear grinding machines, the gear surface strengthening way more and more tend to use carburizing quenching heat treatment method. And before the common induction heat treatment way, quenching the strengthening effect for unstable, quenching cracking tendency is bigger, is difficult to get along the tooth profile distribution of hardening layer, tooth root the strengthening effect poor; The frequency of the power supply heating medium frequency and power adjustable bad, it is hard to be realized induction heating the real-time adjustment quenching parameters. So in recent years in the application of the gear is becoming less and less.
For this purpose, China gear professional association gear heat treatment working committee in September 2006 in taiyuan held the gear induction heating quenching technology workshops, the author to participate in the festival. The delegates each summarizes recent induction heating quenching technology in the gear surface strengthening the application of the achievements and successful experience, we see induction heating quenching in gear aggrandizement application prospect.
The author as for many years in the professional gear manufacturer engaged in the work of the induction heat treatment technology personnel, in this, combined with the industry's actual situations, the talk about induction heating and quenching technology gear aggrandizement on the technology in some comments.
Although carburizing get hardening layer in the uniform distribution and quenching the stability and reliability of the quality has incomparable advantage, but in actual production process is long production period, heat treatment deformation big, and machining difficulty, clean sex differences, energy dissipation shortcomings. Take my group company production of all kinds of GaXian main transmission equipment of the device Lord reducer, gear in the base large module (m > 25 above) gear, gear shaft products it, and because it has the permeability of carbon protection, although the process of carburizing to the carburized parts adopt the seepage prevention with coating protection, but no significant effect, make gear, gear shaft grinding of pure car before half, fine car process problems, adding tools consumption, cause we had to go after carburizing increase a permeability parts of the processes of carburizing layer, virtually increased production cycle. More important, or heat treatment deformation, in actual processing by the tooth of uneven distribution of hardening layer, the size of the poor, after grinding of gears precision is reduced, affect the normal use of requirements. If take leave of the amount increased measures to solve, first to be increasing carburizing layer depth, so will extend carburizing cycle, also cause carburizing layer increases the brittleness, affect the use of the products quality. Carburizing of these defects, it is the induction heating the advantages of quenching technology. Therefore, how to reasonable use induction heating quenching technology, is an urgent subject. According to the years that the work practice of the induction heat treatment, the induction heating along the tooth ditch quenching process, could guarantee the normal use of the gear parts under the above completely solve the problem, the premise is to solve the tooth ditch quenching process of the existing in the following problems:
(1) along the tooth ditch quenching sensor design and manufacturing.
(2) to have hardened the protection that is, how to prevent the gear tooth surface "tempering".
(3) the reasonable selection of quenching cooling way.
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