为了分析研究油套管螺纹脂摩擦因数对特殊扣螺纹上扣曲线的影响规律,对螺纹脂的摩擦因数试验和特殊扣油套管上卸扣试验的结果进行了对比分析。结果表明,摩擦因数在0.900至0.935之间时,台肩扭矩值较低,说明可能存在一个“最优摩擦区间”...为了分析研究油套管螺纹脂摩擦因数对特殊扣螺纹上扣曲线的影响规律,对螺纹脂的摩擦因数试验和特殊扣油套管上卸扣试验的结果进行了对比分析。结果表明,摩擦因数在0.900至0.935之间时,台肩扭矩值较低,说明可能存在一个“最优摩擦区间”,在此区间内特殊扣螺纹接头的过盈配合和密封结构的完整性最高。另外通过对API RP 5A3标准的分析,指出将该标准中的摩擦因数测试方法直接应用于油套管螺纹脂在实际应用中具有局限性,应开发和验证适合评价油套管螺纹脂摩擦学性能的试验方法,以确定不同摩擦学性能的螺纹脂对特殊扣油套管上扣曲线的影响规律。展开更多
This paper proposes the assumption that the flow with viscous friction is the stretch of part of the sheet that lies along the walls of a die during the process of superplastic bulging according to superplastic flow e...This paper proposes the assumption that the flow with viscous friction is the stretch of part of the sheet that lies along the walls of a die during the process of superplastic bulging according to superplastic flow equation and geometrical model of bulging of a sheet into a long trapezoid groove or truncated cone, by introducing the friction-factor P which describes the friction effect on the process. Also, the paper proposes the method of controlling thickness nonuniformity and develops the equipment which for uniform thickness of bulging, is automatically controlled with a computerl it also analyzes the important innuence of lubrication on thickness distribution of bulging materials. By the assumption, the relationship between bulging pressure and time is obtained in bulging of a sheet into the groove and cone, and p-t curve of multi-mould-cavity complicated bulging is discussed based on the analysis of single-mould-cavity bulging characteristics.展开更多
文摘为了分析研究油套管螺纹脂摩擦因数对特殊扣螺纹上扣曲线的影响规律,对螺纹脂的摩擦因数试验和特殊扣油套管上卸扣试验的结果进行了对比分析。结果表明,摩擦因数在0.900至0.935之间时,台肩扭矩值较低,说明可能存在一个“最优摩擦区间”,在此区间内特殊扣螺纹接头的过盈配合和密封结构的完整性最高。另外通过对API RP 5A3标准的分析,指出将该标准中的摩擦因数测试方法直接应用于油套管螺纹脂在实际应用中具有局限性,应开发和验证适合评价油套管螺纹脂摩擦学性能的试验方法,以确定不同摩擦学性能的螺纹脂对特殊扣油套管上扣曲线的影响规律。
文摘This paper proposes the assumption that the flow with viscous friction is the stretch of part of the sheet that lies along the walls of a die during the process of superplastic bulging according to superplastic flow equation and geometrical model of bulging of a sheet into a long trapezoid groove or truncated cone, by introducing the friction-factor P which describes the friction effect on the process. Also, the paper proposes the method of controlling thickness nonuniformity and develops the equipment which for uniform thickness of bulging, is automatically controlled with a computerl it also analyzes the important innuence of lubrication on thickness distribution of bulging materials. By the assumption, the relationship between bulging pressure and time is obtained in bulging of a sheet into the groove and cone, and p-t curve of multi-mould-cavity complicated bulging is discussed based on the analysis of single-mould-cavity bulging characteristics.
