目次へ 許容歯元曲げ応力σ0[N/mm2] 片振り引張疲れ限度を応力集中係数1.4で割った値。 |
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●高周波焼入れ[参考:KHKカタログ] |
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材料[参考] |
高周波焼入前の熱処理条件 |
心部硬さ |
歯面硬さ |
σ0 |
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HB |
Hv |
Hv |
N/mm2 |
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歯底まで完全に焼入れた場合 |
構造用炭素鋼 |
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S43C |
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焼ならし |
160 |
167 |
550以上 |
206 |
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S48C |
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180 |
189 |
〃 |
206 |
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220 |
231 |
〃 |
211 |
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240 |
252 |
〃 |
216 |
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S43C |
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焼入れ焼もどし |
200 |
210 |
550以上 |
225 |
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S48C |
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210 |
221 |
〃 |
230 |
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220 |
231 |
〃 |
235 |
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230 |
242 |
〃 |
240 |
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240 |
252 |
〃 |
245 |
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250 |
263 |
〃 |
245 |
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構造用合金鋼 |
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焼入れ焼もどし |
230 |
242 |
550以上 |
265 |
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SMn443 |
SCM440 |
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240 |
252 |
〃 |
274 |
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250 |
263 |
〃 |
284 |
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260 |
273 |
〃 |
294 |
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SCM435 SNC836 |
SNCM439 |
270 |
284 |
〃 |
304 |
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280 |
295 |
〃 |
314 |
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290 |
305 |
〃 |
323 |
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300 |
316 |
〃 |
333 |
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310 |
327 |
〃 |
343 |
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320 |
337 |
〃 |
358 |
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歯底には焼きが入っていない場合 |
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上記の値の75% |
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