發(fā)布時間：2018-07-07 15:09

  本文選題：軟性磨粒流 + 光整加工　； 參考：《機(jī)械工程學(xué)報(bào)》2016年21期

【摘要】：為了提高軟性磨粒流加工過程中的湍流強(qiáng)度分布均勻性與材料去除率,提出一種基于超聲波激振湍流強(qiáng)化的軟性磨粒流光整加工方法。在磨粒流約束流道內(nèi)引入超聲激勵,利用超聲波的空化效應(yīng)控制流道內(nèi)的流體流態(tài)。建立考慮液固及聲場耦合的磨粒流加工動力學(xué)模型,對其加工過程中的流場特性進(jìn)行了模擬研究,并搭建超聲強(qiáng)化磨粒流加工試驗(yàn)平臺進(jìn)行驗(yàn)證。數(shù)值仿真結(jié)果表明,非定常流場可獲得更為均勻的速度矢量和湍動能分布,超聲波激振引起空化效應(yīng)能夠有效地增強(qiáng)軟性磨粒流的湍流強(qiáng)度和避免加工死角的出現(xiàn),同時揭示湍流增強(qiáng)導(dǎo)致磨粒流動軌跡復(fù)雜多變是加載超聲波激振抑制磨粒流的過加工和粗糙度值翹尾現(xiàn)象形成的原因。加工試驗(yàn)表明,該方法可減小加工時間約6 h,能夠得到更為均勻的表面質(zhì)量。
[Abstract]:In order to improve the uniformity of turbulent intensity distribution and the material removal rate in soft abrasive flow machining, a new method of soft abrasive flow finishing based on ultrasonic induced turbulence enhancement was proposed. The ultrasonic excitation is introduced into the abrasive flow confined channel and the flow state in the channel is controlled by the cavitation effect of ultrasonic wave. A dynamic model of abrasive flow machining considering the coupling of liquid solid and sound field was established. The flow field characteristics in the process were simulated and the ultrasonic enhanced abrasive flow machining test platform was built to verify the model. The numerical simulation results show that the unsteady flow field can obtain more uniform velocity vector and turbulent kinetic energy distribution, and the cavitation effect caused by ultrasonic excitation can effectively enhance the turbulent intensity of soft abrasive flow and avoid the appearance of machining dead angle. At the same time, it is revealed that the complex and variable flow path of abrasive particles caused by turbulence enhancement is the reason that the ultrasonic induced vibration inhibits the over-machining of abrasive flow and the phenomenon of roughness warping. The processing test shows that the method can reduce the processing time about 6 hours and obtain more uniform surface quality.
【作者單位】： 浙江工業(yè)大學(xué)特種裝備制造與先進(jìn)加工技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室;杭州師范大學(xué)信息科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金(51375446,51575494) 浙江省自然科學(xué)基金重點(diǎn)(LZ14E050001) 浙江省資助項(xiàng)目
【分類號】：O357.5;TG664

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本文編號：2105340