| 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。 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  | ●高周波焼入れ[参考:KHKカタログ] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  | HB | Hv | Hv | N/mm2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  | 歯底まで完全に焼入れた場合 | 構造用炭素鋼 |  |  | S43C |  | 焼ならし | 160 | 167 | 550以上 | 206 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  | S48C |  | 180 | 189 | 〃 | 206 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  | 220 | 231 | 〃 | 211 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  |  | 240 | 252 | 〃 | 216 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  | S43C |  | 焼入れ焼もどし | 200 | 210 | 550以上 | 225 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  | S48C |  | 210 | 221 | 〃 | 230 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  | 220 | 231 | 〃 | 235 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  | 230 | 242 | 〃 | 240 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  | 240 | 252 | 〃 | 245 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  | 250 | 263 | 〃 | 245 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  | 構造用合金鋼 |  |  |  |  | 焼入れ焼もどし | 230 | 242 | 550以上 | 265 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  | SMn443 | SCM440 |  |  | 240 | 252 | 〃 | 274 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  | 250 | 263 | 〃 | 284 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  | 260 | 273 | 〃 | 294 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  | SCM435 SNC836 | SNCM439 | 270 | 284 | 〃 | 304 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  | 280 | 295 | 〃 | 314 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  | 290 | 305 | 〃 | 323 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  | 300 | 316 | 〃 | 333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  | 310 | 327 | 〃 | 343 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  |  |  |  | 320 | 337 | 〃 | 358 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
  | 歯底には焼きが入っていない場合 |  |  |  |  |  |  |  |  |  | 上記の値の75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 
 
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