Abstract
In order to solve the problem that the aperture of the small hole part is too small and the irregular shape of the surface is difficult to be processed. A solid - liquid two - phase abrasive grain polishing method is proposed. Based on the standard model and SIMPLEC algorithm, the numerical simulation of the surface of the micro – holes were carried out under different inlet speed conditions. The change of the turbulence kinetic energy, dynamic pressure and turbulence intensity of the micro – holes flow channel with the inlet velocity is discussed. The quality control law of the inlet velocity on the sol-id-liquid two-phase abrasive flow polishing. In order to verify the accuracy of the numerical analysis, the necessary solid-liquid two-phase flow polishing test was carried out with the micro-hole parts. The surface roughness of the inner surface of the micro-holes before and after polishing was tested. The results show that the surface roughness is reduced from 1.702 before polishing to 0.303 after polishing. The solid - liquid two - phase abrasive flow machining can effectively improve the surface quality of micro – holes.
Highlights
With the increasing development of science and technology, micro-hole parts in the aerospace, automobile manufacturing, mold manufacturing, textile machinery and other fields have a wide range of applications as: the car engine nozzle, textile machinery on the precision parts spinneret, extrusion molds and medical equipment [1]
Due to the small pore size of small holes and irregular shape, the traditional polishing technology is difficult to effectively polish its inner surface, especially for the surface quality requirements of small hole parts, its ultra-precision machining is even more difficult, the abrasive flow processing technology can be used for the finishing of the inner surface of micro-hole parts because of its good fluidity and consistency [2,3,4,5,6]
The micro – holes were polished by solid-liquid two-phase abrasive flow polishing method and the numerical simulation was carried out
Summary
With the increasing development of science and technology, micro-hole parts in the aerospace, automobile manufacturing, mold manufacturing, textile machinery and other fields have a wide range of applications as: the car engine nozzle, textile machinery on the precision parts spinneret, extrusion molds and medical equipment [1]. Due to the small pore size of small holes and irregular shape, the traditional polishing technology is difficult to effectively polish its inner surface, especially for the surface quality requirements of small hole parts, its ultra-precision machining is even more difficult, the abrasive flow processing technology can be used for the finishing of the inner surface of micro-hole parts because of its good fluidity and consistency [2,3,4,5,6]. The micro – holes were polished by solid-liquid two-phase abrasive flow polishing method and the numerical simulation was carried out. The surface analysis of the parts is carried out to verify the accuracy of the numerical simulation results, which can provide technical support for the future use of abrasive flow technology to polish tiny holes [7,8,9,10]
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