はすば歯車の焼入れ変形に対する焼入れ性の影響 : 第1報,低合金鋼製歯車のずぶ焼入れ

概要

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Some helical gears, which were made of three low alloyed steels and had different numbers of teeth, were through-hardened to investigate how hardenability affects gear distortions caused by hardening. From the experimental results, the hardenability of gear material influences changes of the tip cylinder diameter. Also, the helix angle is apt to decrease through the heat treatment, and the extent of its change is related to the hardenability and helix angle. Furthermore, because the face width of the test gears had an effect on gear distortions, the Jominy test was carried out and the equation of the temperature in the quenching process of solid cylinders, which were substituted for the test gears, was induced theoretically. And it is shown from the relation between the maximum cooling rate and the volume fraction of martensite that the difference of the region occupied with martensite is related with the hardenability of the material, and that the thickness of the hardened layer gives different gear distortions.
社団法人日本機械学会の論文
1986-08-25