基于贝壳表面仿生螺纹研究

发布时间：2018-04-27 21:53

本文选题：油管螺纹 + 粘扣　；参考：《长春理工大学》2015年硕士论文

【摘要】：粘扣是油管螺纹的主要失效形式之一,而石油生产全过程中所应用的各类管件(油管、套管、输油管等)均采用螺纹联接,因此,解决油管的粘扣问题,一直是石油管件生产中的热门话题。本文从油管螺纹粘扣的机理入手将贝壳表面沟槽状仿生非光滑结构的耐磨特点应用在油管螺纹上以达到抗粘扣的目的。利用有限元仿真的方法对普通油管螺纹、仿生非光滑沟槽结构油管螺纹在拧紧力矩作用下与轴向力作用下的齿面载荷分布进行模拟。结果表明,仿生油管螺纹表面接触应力全面低于普通螺纹,有效地减小了螺纹表面应力集中现象。为了得到理想的仿生抗粘扣螺纹,采用激光加工的手段,运用合理地工艺方法将贝壳表面的沟槽结构加工在油管螺纹表面。通过对未加工仿生结构的普通螺纹试件、“0.5mm×0.4mm仿生沟槽结构单元”油管螺纹试件、“0.5mm×0.8mm仿生沟槽结构单元”油管螺纹试件在实际工况下进行拧接试验。结果表明,在相同条件下,“0.5mm×0.4mm仿生沟槽结构单元”油管螺纹试件所需拧紧扭矩相较于普通螺纹降低5.15%,拧接次数增加2次,“0.5mm×0.8mm仿生结构单元”油管螺纹试件所需拧紧扭矩相较于普通螺纹降低9.06%,拧接次数多3次,仿生沟槽结构显著提高了油管螺纹抗粘扣性能。面积大的仿生沟槽结构油管螺纹相较于面积小的仿生沟槽结构油管螺纹拧紧力矩减小4.03%,拧接次数多1次,抗粘扣性能更佳。
[Abstract]:Adhesive buckling is one of the main failure forms of tubing thread, and all kinds of pipe fittings (tubing, casing, oil pipeline, etc.) used in the whole process of oil production are threaded, so the problem of tubing sticking is solved. It has always been a hot topic in the production of oil pipe fittings. In this paper, based on the mechanism of tubing thread adhesion, the wear resistance characteristics of the grooved non-smooth structure on the shell surface are applied to the tubing thread in order to achieve the purpose of anti-adhesive buckling. The finite element simulation method is used to simulate the tooth surface load distribution of the common tubing thread and the bionic non-smooth groove structure tubing thread under the action of tightening torque and axial force. The results show that the contact stress on the thread surface of the bionic tubing is lower than that of the common thread, which effectively reduces the stress concentration on the thread surface. In order to obtain ideal biomimetic anti-adhesion thread, the groove structure of shell surface is processed on the surface of tubing thread by means of laser processing and reasonable processing method. 0.5mm 脳 0.4mm bionic groove structure unit "tubing thread specimen" and "0.5mm 脳 0.8mm bionic groove structure unit" tube-threaded specimen were tested under actual working conditions by means of unmachined normal threaded specimens with biomimetic structure, "0.5mm 脳 0.4mm bionic groove structure unit" and "0.5mm 脳 0.8mm bionic groove structure unit". The results show that, under the same conditions, the tightening torque of the "0.5mm 脳 0.4mm bionic groove structure unit" tubing thread specimen is 5.15 less than that of the common thread, and the twisting times increase by 2 times. The tightening torque of "0.5mm 脳 0.8mm Bionic structural Unit" tubing thread specimen is 9.06 lower than that of ordinary thread, and the number of twisting is more than 3 times. The bionic groove structure obviously improves the anti-sticking and buckling performance of tubing thread. Compared with the small area bionic grooves, the screw thread of bionic grooves with large area decreases 4.03 points of tightening torque, the number of twisting times is more than one time, and the performance of anti-adhesion buckle is better than that of bionic grooves with small area.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2

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