The Design And Research Of Adaptive Honing Device For The Inner Surface Finishing Of The Pipeline

Many quality problems occur frequently during service period for pipeline,such as: rust, clogging, corrosion, leakage and even fracture caused by internal cracks. These are related to the quality of inner surface in addition to its own material, size and intensity. Therefore, the inner surface of the pipe must meet certain quality requirements. Used as an end processing step, the surface finishing is of great significance for improving the surface quality and the performance of parts.The existing problems of the pipeline are studied in this paper, and one adaptive honing device is designed for inner surface finishing of Φ106mm pipe basing on the actual situation of distortion, dimension change etc. This device is composed by processing section and supporting section, driven by external motor which can make a rotary movement and axial movement. Processing section is designed by combining traditional honing and adaptive mechanism.The oilstones embedded in grooves which can make a friction with the pipe wall,the finishing is achieved by friction. The supporting section is mainly used for preventing the deviation caused by gravity of push rod. The adaptive mechanism is also used in this section to ensure the centering of device. Therefore, this whole device is capable of adaptability. The main contents are as follows:1. Each section of the device is described and analyzed theoretically. The working principle of processing section is introduced, and the adaptive mechanism is analyzed theoretically. The force between the pipe wall and the oilstones is deduced. The self-locking of slider and the crossed texture formed during finishing are analyzed respectively. Meanwhile, the working principle of supporting section is introduced, and the force between the pipe wall and the wheels is deduced.2. This device is simulated based on ADAMS virtual prototyping technology. The simulation results verify the correctness of theoretical analysis,and show that the major factor affecting the size of force between the pipe wall and oilstones is spring preload, the major factor affecting the changing frequency of force between the pipe wall and oilstones is spindle speed, the major factor affecting the volatility of force between the pipe wall and oilstones is the gravity of section. The supporting section is simulated under different posture angles of 0°, 30°, 60° and 90°. The results show the best posture angle is0°.3. The components of device are designed and analyzed by Finite Element Analysis. The bracket, slider, the main supporting base, deputy supporting base,cover and the transmission shaft are designed respectively. The spring, bearing and coupling are selected. On this basis, the whole assembly of the device iscompleted. The intensity satisfy the requirements based on the results of simulation which are made by Solid Works Simulation.4. Prototype making and experiments. The Physical prototype of the processing section is made. The vertical and horizontal experimental platform are built basing on the existing laboratory conditions. The feasibility of this device is verified by experiments, and experiments are made by changing processing methods, spring preload, oilstone mesh etc, in order to provide guidance for production.