| DENG Qian-fa,WANG Yang-xiao,LYU Bing-hai,LI Gan,CHENG Jun,YUAN Ju-long.Numerical Analysis and Experimental Verification on Self-excited Pulse Characteristics Abrasive Water Jet Submersion Polishing[J],51(1):161-173 |
| Numerical Analysis and Experimental Verification on Self-excited Pulse Characteristics Abrasive Water Jet Submersion Polishing |
| Received:March 27, 2021 Revised:July 03, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.01.017 |
| KeyWord:self-excited oscillation abrasive jet submerged machining ceramics polishing numerical simulation |
| Author | Institution |
| DENG Qian-fa |
Ultra-precsion Machining Center,Key laboratory of Special Purpose Equipment and Advanced Manufacturing Technology, Zhejiang University of Technology, Hangzhou , China |
| WANG Yang-xiao |
Ultra-precsion Machining Center,Key laboratory of Special Purpose Equipment and Advanced Manufacturing Technology, Zhejiang University of Technology, Hangzhou , China |
| LYU Bing-hai |
Ultra-precsion Machining Center,Key laboratory of Special Purpose Equipment and Advanced Manufacturing Technology, Zhejiang University of Technology, Hangzhou , China |
| LI Gan |
Ultra-precsion Machining Center,Key laboratory of Special Purpose Equipment and Advanced Manufacturing Technology, Zhejiang University of Technology, Hangzhou , China |
| CHENG Jun |
Ultra-precsion Machining Center,Key laboratory of Special Purpose Equipment and Advanced Manufacturing Technology, Zhejiang University of Technology, Hangzhou , China |
| YUAN Ju-long |
Ultra-precsion Machining Center,Key laboratory of Special Purpose Equipment and Advanced Manufacturing Technology, Zhejiang University of Technology, Hangzhou , China |
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| Abstract: |
| To improve its processing ability in a submerged environment, the influence of fluid self-excited pulse characteristics on abrasive water jet polishing is studied. In this paper, a Submerged Self-excited Oscillation Water Jet Polishing (SSEO-AWJP) was proposed, which made use of a specific boundary condition of the chamber to obtain self-excited pulsation characteristics of abrasive water jet, so that it could obtain better machining performance in water. First, numerical simulation was used to analyze the fluid state of the self-excited pulsed jet in a submerged environment. After that, the influence of the axial distance and incident angle between the nozzle and the workpiece on the force of the surface was studied. Finally, a processing experimental platform of SSEO-AWJP was built to conduct a comparison experiment of silicon nitride polishing to verify the effectiveness of the fluid self-excited pulse characteristics in improving the polishing ability of abrasive water jets in a submerged environment. The simulation results showed that the jet beam of SSEO-AWJP existed in the form of pulses in the liquid and had better retention. When the jet beam impacted the workpiece, its pulse characteristics made it destroy the stability of the stagnant layer on the surface of the workpiece, resulted in the Pfm moves back and forth on the surface of the workpiece, and obtained a higher peak wall shear force to achieve efficient material removal. And the surface polishing experiments of silicon nitride showed that under the same conditions, fixed-point processing for 25 min, the maximum removal depth of the processing area of submerged abrasive water jet was 6.86 μm, and the maximum depth of the processing area of SSEO-AWJP was 17.30 μm; the surface roughness Ra of the workpiece reached 35.7 nm after 14 times of processing by submerged abrasive water jet polishing, and that Ra of the workpiece reached 48.8 nm after 5 times of processing by SSEO-AWJP. The surface roughness decreased rate of workpiece processed by SSEO-AWJP was always greater than S-AWJP. However, influenced by the kinetic energy of abrasive particles, the surface roughness of SSEO-AWJP would be higher under the same conditions. The used of finer abrasives could make the surface quality after the two methods more similar. The effectiveness of SSEO-AWJP is verified by numerical simulation and experimental analysis, and the abrasive water jet can achieve the purpose of efficient machining in the submerged environment by using the self-excited pulse characteristic. |
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