Surface Durability of Ni-Mo Pre-Alloyed Sintered Steel Case-Carburizing Gears with Different Densities and Contact Stress Analysis Using FEM Model Considering Voids

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  • 密度の異なるNi-Moプレアロイ合金焼結浸炭焼入れ歯車の面圧疲労強度と空孔を考慮したFEMによる接触応力解析
  • ミツド ノ コトナル Ni-Mo プレアロイ ゴウキン ショウケツ シンタン ヤキイレ ハグルマ ノ メンアツ ヒロウ キョウド ト クウコウ オ コウリョ シタ FEM ニ ヨル セッショク オウリョク カイセキ

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<p>The contact fatigue tests were first carried out using Ni-Mo pre-alloyed sintered steel (46F4H) spur gears with different densities in the range of 7.30~7.54 Mg/m3. The sintered gear specimens were machined from sintered steel packs made from the single-press single-sinter route and some were surface-rolled using CNC form rolling machine. All test gears were case-carburized. The experimental results showed that the surface-rolled sintered gears with a density of 7.40 Mg/m3 or more had sufficiently high contact fatigue strength to replace gears made of typical Cr-Mo case-carburized wrought steel. These experimental results were then analytially investigated by examining the contact stress distributions around the operating pitch point of P/M pinion using a simplified two-dimensional finite element model considering voids. The peak of the maximum shear stress τmax increased with the decrease of density of the as-sintered gears and decreased as the amount of fully densified depth δ increased. There was only a slight difference in the distribution profile of τmax for every P/M pinion when δ reached to a specified depth of approximately 0.3 mm. These simulation results appear to explain the gear-running test results well and reveal the appropriate surface densification level.</p>

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