本文選題：流體拋光 + 氣-液-固三相磨粒流拋光��； 參考：《光學(xué)精密工程》2016年04期

【摘要】：考慮用流體拋光法加工大尺度工件存在效率低下問題,本文提出了一種氣-液-固三相磨粒流拋光方法。該方法在約束流場中引入微納米氣泡,利用氣泡在潰滅時(shí)釋放的能量加速驅(qū)動磨粒運(yùn)動,從而有效提升拋光效率。實(shí)驗(yàn)顯示:在加工過程中,離心泵的發(fā)熱會導(dǎo)致流體黏度下降,進(jìn)而影響工件近壁面的湍動能和動壓力的大小及分布,而加工工件近壁面的湍動能和動壓力會對表面紋理的均勻性和材料的去除效率有重要影響。針對上述實(shí)驗(yàn)結(jié)果,文中基于對磨粒流拋光機(jī)理的研究,提出一種通過改變?nèi)肟诹魉賮硌a(bǔ)償溫升帶來的湍動能和動壓力變化的方法,實(shí)驗(yàn)求得了拋光流體溫度從20℃到60℃之間的9個(gè)均等點(diǎn)對應(yīng)的最優(yōu)入口流速值。實(shí)驗(yàn)表明,相對未加入氣泡時(shí),該拋光方法的加工效率得到提高,而調(diào)速補(bǔ)償明顯提升了工件表面加工質(zhì)量。
[Abstract]:Considering the low efficiency of machining large-scale workpieces by fluid polishing, a gas-liquid-solid three-phase abrasive flow polishing method is proposed in this paper. In this method, micro and nano bubbles are introduced into the confined flow field, and the energy released by the bubbles is used to accelerate the movement of the abrasive particles, thus effectively improving the polishing efficiency. The experimental results show that the heat of centrifugal pump will lead to the decrease of fluid viscosity, which will affect the turbulent kinetic energy and the size and distribution of the dynamic pressure near the wall of the workpiece. The turbulent kinetic energy and dynamic pressure near the wall of the workpiece will have an important effect on the uniformity of the surface texture and the removal efficiency of the material. Based on the above experimental results, a method is proposed to compensate for the change of turbulent kinetic energy and dynamic pressure caused by temperature rise by changing the inlet velocity based on the study of the polishing mechanism of abrasive particle flow. The optimal inlet velocity values corresponding to 9 equal points of polishing fluid temperature from 20 鈩，

本文編號：1988867