Soft Abrasive Flow Machining Simulation and Experiment of the Large Curvature Bend Based on RNG k-ε Model
Author(s): SHEN Ming, DAI Yong, CHU Cong, YE Jian-ling, GE Man, YUAN Qiao-ling
Pages: 39-44
Year: 2016 Issue: 5
Journal: Hydraulics Pneumatics & Seals
Keyword: small size; large curvature; structured surface; soft abrasive flow; RNG k-e turbulence model; precision processing without tools;
Abstract: In view of the problems of surface of small size and large curvature bend structural is difficult to use tools to make the contact skin pass processing. This project presents a method to use soft abrasive flow to process this type of the inner surface of elbow pipe. In order to verify the theoretical analysis is correct, to do simulation experiment in the whole inside of flow passage during the process of processing based on RNG k-e turbulence model. Also, the experimental platform is built to do processing experiment In order to verify the reliability of the simulation experiment. The results of simulation show that the wear particles are doing irregular movement in the elbow pipe, and there are obviously velocity and pressure differences in the inner and outer wall of the elbow pipe. And with the inlet pressure increased from 2.0MPa to 3.0MPa, the internal pressure and speed will also increase. In processing experiment,each point of internal surface of the work-piece is relatively large before processing, so average roughness is correspondingly larger, about 1.072μm. After the workpiece is processed for a period of time, the light of internal surface becomes better, and with the increase of the entry pressure, the effect of processing gets bet-ter, the average level of surface roughness is increased and the light is gradually improved, up to 0.450μm. The results of processing experi-ment show that the cutting marks in the near wall region of the wear debris is indeed doing the irregular movement, which is fit with the re-sults of the numerical simulation in early stage. Based on the theoretical analysis that simulation experiments and processing tests provides a theoretical and practical evidences for soft abrasive to achieve a small size and precision machining without tool of large curvature bend.
Pages: 39-44
Year: 2016 Issue: 5
Journal: Hydraulics Pneumatics & Seals
Keyword: small size; large curvature; structured surface; soft abrasive flow; RNG k-e turbulence model; precision processing without tools;
Abstract: In view of the problems of surface of small size and large curvature bend structural is difficult to use tools to make the contact skin pass processing. This project presents a method to use soft abrasive flow to process this type of the inner surface of elbow pipe. In order to verify the theoretical analysis is correct, to do simulation experiment in the whole inside of flow passage during the process of processing based on RNG k-e turbulence model. Also, the experimental platform is built to do processing experiment In order to verify the reliability of the simulation experiment. The results of simulation show that the wear particles are doing irregular movement in the elbow pipe, and there are obviously velocity and pressure differences in the inner and outer wall of the elbow pipe. And with the inlet pressure increased from 2.0MPa to 3.0MPa, the internal pressure and speed will also increase. In processing experiment,each point of internal surface of the work-piece is relatively large before processing, so average roughness is correspondingly larger, about 1.072μm. After the workpiece is processed for a period of time, the light of internal surface becomes better, and with the increase of the entry pressure, the effect of processing gets bet-ter, the average level of surface roughness is increased and the light is gradually improved, up to 0.450μm. The results of processing experi-ment show that the cutting marks in the near wall region of the wear debris is indeed doing the irregular movement, which is fit with the re-sults of the numerical simulation in early stage. Based on the theoretical analysis that simulation experiments and processing tests provides a theoretical and practical evidences for soft abrasive to achieve a small size and precision machining without tool of large curvature bend.
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