Adaptive Two-Phase Compulsive Circumfluence Inner Surface Finishing Technical Research For The Pipeline

The research is based on the national science fund project (Project Number:50675149), which is to study the liquid-solid two-phase compulsive circumfluence finishing process. The process uses the high pressure liquid which will flow through the circulation generator to carry the grinding particles finishing the hole. Because of the liquid-solid two-phase compulsive circumfluence finishing process uses the high pressure liquid as power source which need special equipment to generate the high pressure and need special line to introduce the high pressure liquid to the circulation generator, it will be very difficult to implement. This article is the improvement of the above finishing process. The liquid is replaced by the high pressure gas at the same time the circulation generator is dragged by the automatic feeding device which can move steady in the hole so as to achieve the purpose of continuous processing.This article put forward a kind of hole finishing device which is adaptability to the different hole size. The device is used to improve the quality of the inner hole, such as the oil and gas pipelines, water supply and drainage pipelines, ventilation pipelines, etc. This device is constituted of two main parts, the feed part and the finishing part. The feed is realized by the screw type automatic feeding machine, and the finishing part is used by gas-solid two-phase compulsive circumfluence finishing machine. The feed part has certain adaptability, which can move steady in the bend or unsmooth hole, and also can control its speed or direction by changing the motor’s rotation. Finishing part which is driven by the feed part can also move stably in the hole. At the same time, the continuously poured high pressure gas will carry the grinding particles finishing the hole.Firstly, the article carries on the calculation and analysis of the movement and the force of the grinding particles which move speedily in the ring working area. Determine the type of the automatically feed component and analysis of the traction of the automatic feeding part. Obtain the relationship between the spring pre-compression and the traction while the pipe geometry size is fixed.Carried on the united simulation of SolidWorks and ADAMS, the article reaches the relationships between the kinetic characteristics by changing the spring pre-compression and the load. The simulations show when the single drive and support spring pre-compression are250N and90N, the traction can reach140N, and the needed motor torque is less than2N·m.Then, it simulates the gas movement in the working area by using the FLUENT software. Reach the flow velocity distribution, turbulence structure, and the influence of different parameters on the gas movement by analyzing the different parameters, such as the outflow diameter, the angle, the outflow velocity and the outflow number. The article also analyzes the track of single grinding particle, due to the complex combination of the forces, the particle track is full of randomness. This just meet the requirement of finishing process which requires the relative movement between the particle and work is as complex as possible.Finally, through the experiments in the Φ151mm hole, get the results of processing conditions of different abrasive materials and different loading degrees. Based on the two kinds of materials in the lab, the processing effect of Al2O3is much better than SiC. Comparing the different loading degrees, it is concluded that we can reach the better efficiency while the loading degree is between1.53%to2.30%.