Abstract
Abrasive flow machining (AFM) technology can achieve precision machining finish for processing special curved pipe parts. In order to study the processing effect of abrasive flow machining for special curved pipe parts, polygonal spiral curved pipe is taken as the research object. The large eddy simulation (LES) method is used to simulate and numerically analyze the processing of polygonal spiral curved pipe. The static pressure cloud diagram, turbulence kinetic energy cloud diagram and turbulence intensity cloud diagram under different inlet pressures are obtained to analyze the influence of inlet pressure on the workpiece processed by abrasive flow. The fluid trace diagrams are obtained at the inlet and outlet of the workpiece, and the vortex changes of the fluid inside the workpiece are analyzed. The mechanism of vortex variation is revealed, which provides theoretical support for practical processing in the future.
Highlights
Abrasive flow machining (AFM) is a kind of processing technology that can mix abrasive with certain concentration and flow through the workpiece surface under certain inlet pressure to finish deburring, fillet and stress relief which are difficult or impossible for other processes [1, 2]
This paper studies the abrasive flow machining performance under different inlet pressure conditions, so the inlet boundary condition is set as the pressure inlet boundary condition
The static pressure cloud diagram, turbulence kinetic energy cloud diagram and turbulence intensity cloud diagram of polygonal spiral curved pipe machined by solid-liquid two-phase abrasive flow are studied by large eddy simulation method under the inlet pressure of 3 MPa, 4 MPa, 5 MPa and 6 MPa
Summary
Abrasive flow machining (AFM) is a kind of processing technology that can mix abrasive with certain concentration and flow through the workpiece surface under certain inlet pressure to finish deburring, fillet and stress relief which are difficult or impossible for other processes [1, 2]. It is important to study the processing accuracy and quality of polygonal spiral curved pipes. Ranjan P. et al conducted a molecular dynamics simulation to investigate the material removal phenomenon of chemo-mechanical magneto-rheological finishing (CMMRF) process. Effects of process parameters like abrasive particles, depth of penetration and initial surface condition on finishing force, potential energy and material removal at atomic scale were investigated. It was observed that the type of abrasive particle was one of the important parameters to produce atomically smooth surface [3]. NUMERICAL SIMULATION OF POLYGONAL SPIRAL CURVED PIPE WITH ABRASIVE FLOW MACHINING BASED ON LARGE EDDY SIMULATION. Li et al used molecular dynamics methods to simulate the micro-cutting of iron-carbon alloys with silicon carbide particles to explore the evolution mechanism of the subsurface defect structure of iron-carbon alloy workpieces in the abrasive flow machining process. The distribution and evolution of defect structure during micro-cutting were analyzed, and the removal mechanism of workpiece material during micro-cutting was revealed [6]
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