特殊螺紋接頭加工橢圓度影響理論研究

Theoretic Study on Influence by Machining Ovality of Premium Connections

摘要: 利用“面積法”和“應(yīng)力積分法”，研究特殊螺紋接頭加工橢圓度對接頭上扣扭矩的影響，計算得到橢圓度面積影響因子k_S 和橢圓度應(yīng)力積分影響因子k_F，并用實例進行驗證。分析認為：“應(yīng)力積分法”更適合定量表征特殊螺紋接頭加工橢圓度對接頭上扣過盈配合的影響；建議氣密封特殊螺紋接頭的橢圓度極差值取API Spec 5B—2017 標準給出的一半。

Abstract: Studied here in the article is the influence by the machining ovality of the premium connection on the make-up torque thereof by means of the Area Method and the Stress Integration Method. As a result the two related impact factors,i.e.,the ovality area impact factor k_S and the ovality stress integration impact factor k_F are worked out via computation,and then verified by living examples. It is regarded via the analysis that comparatively the Stress Integration Method is more suitable for measuring the influence by the premium connection superficial characteristic machining ovality on the connection make-up tight fit. And accordingly it is suggested that the ovality range of the air-tight premium connection be determined as half of that as specified under API Spec 5B—2017.