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有限要素法による油井管用プレミアムジョイント“FOX”の特性解析

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川崎製鉄技報

KAWASAKI STEEL GIHO Vol.21 (1989) No.3

有限要素法による油井管用プレミアムジョイント“FOX”の特性解析

Stress Analysis of Premium Threaded Connection "FOX" by Finite Element Method 山 本 健 一(Ken-ichi Yamamoto) 小 林 邦 彦 (Kunihiko Kobayashi) 間 口 龍 郎 (Tatsuro Maguchi) 上野 雄夫(Katsuo Ueno)

要旨 : 油井管用プレミアムジョイント“FOX”の最大の特長は,ピッチチェンジ法という新しい 概念を導入しているところにある。こらは,ネジピッチを途中で変更することにより歯に かかる接触面圧分布を均一化させ,継手性能の向上を図ることを目的としている。FOX の 開発において有効な手段となった有限要素法による応力解析は,締め付け時および軸力負 荷時の継手の状態を精度よくシュミレートしている。解析結果から,耐ゴーリング性,耐 リーク性,強度などの性能はピッチチェンジにより改善されることが明らかになった。ま た,ピッチチェンジ量をFOX の最適値から変化させた場合の性能についても示した。 Synopsis :

The principal feature of the premium threaded connection "FOX" is the introduction of pitch change concept to the thread design. The thread pitch of a connection is changed at two locations, hence the maximum contact pressure at the load flank of the tooth is reduced, and the uniform contact pressure distribution along the threads is obtained in the made-up and/or tensile loaded state compared with conventional premium threaded connections. The FOX design was developed mainly by the finite element analysis (FEA) which sufficiently simulated the actual behaviors of the made-up and/or tensile loaded connection. Results of FEA prove that joint characteristics such as anti-galling, leak tightness, and joint strength are greatly improved through the uniform contact pressure distribution along the threads. Furthermore, changes in joint characteristics with the amount of pitch changes are also analyzed and discussed.

(c)JFE Steel Corporation, 2003

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