發(fā)布時間：2018-05-04 17:01

  本文選題：超聲 + 壓鑄��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：摘要：晶粒尺寸是決定金屬材料性能的主要因素,晶粒細(xì)化方法有很多,本文中用到的是超聲處理法。超聲處理細(xì)化晶粒主要是依靠超聲空化作用局部的瞬時高溫高壓以及強(qiáng)烈沖擊波,打碎枝晶生長,并配合超聲聲流效應(yīng)、熱效應(yīng)等,提高形核率,細(xì)化晶粒。本文重點(diǎn)對超聲探頭以及超聲波處理儀進(jìn)行介紹,超聲探頭設(shè)計(jì)主要包括超聲探頭的結(jié)構(gòu)設(shè)計(jì)、工藝參數(shù)設(shè)計(jì)以及殼體安裝設(shè)計(jì),超聲波處理儀主要介紹其工作所處特殊壓鑄條件及其功能與工作流程。另外本文還對實(shí)驗(yàn)數(shù)據(jù)進(jìn)行分析,并對現(xiàn)有超聲處理系統(tǒng)存在的問題進(jìn)行總結(jié)。 本文還對實(shí)驗(yàn)樣品的金相和力學(xué)性能做觀察分析,實(shí)驗(yàn)數(shù)據(jù)并不能很好吻合超聲處理與金屬晶粒細(xì)化之間的關(guān)系。其主要原因有以下兩點(diǎn)：一是超聲探頭工作頻率發(fā)生偏移,進(jìn)而影響超聲功率輸出,而超聲頻率和功率是影響金屬晶粒細(xì)化效果的主要參數(shù)；二是由于超聲探頭位于壓鑄腔內(nèi),造成處理時間過短,僅為幾十毫秒,超聲作用不明顯。針對以上兩點(diǎn)原因提出對策：第一,增設(shè)頻率自動跟蹤裝置,使得超聲波處理儀自動跟蹤超聲探頭的負(fù)載,并調(diào)節(jié)至最佳頻率；第二,改變超聲探頭安裝位置,增加超聲處理時間。
[Abstract]:Abstract: grain size is the main factor to determine the properties of metal materials. There are many methods for grain refinement. Ultrasonic treatment is used in this paper. Ultrasonic treatment mainly depends on local instantaneous high temperature and high pressure and strong shock wave of ultrasonic cavitation to break dendrite growth and cooperate with ultrasonic acoustic flow effect and thermal effect to increase nucleation rate and refine grain. This paper mainly introduces the ultrasonic probe and the ultrasonic processing instrument. The ultrasonic probe design mainly includes the structure design, the process parameter design and the shell installation design of the ultrasonic probe. The special die-casting condition, function and working flow of ultrasonic instrument are introduced. In addition, the experimental data are analyzed, and the existing problems of ultrasonic processing system are summarized. The metallographic and mechanical properties of the experimental samples are also observed and analyzed. The experimental data do not agree well with the relationship between ultrasonic treatment and grain refinement. The main reasons are as follows: first, the frequency of ultrasonic probe is offset, which affects the output of ultrasonic power, and the frequency and power of ultrasonic are the main parameters that affect the effect of grain refinement of metal, and the second is that the ultrasonic probe is located in the die casting cavity. The treatment time is too short, only tens of milliseconds, ultrasonic action is not obvious. In view of the above two reasons, the following countermeasures are put forward: first, the frequency automatic tracking device is added to make the ultrasonic processor automatically track the load of the ultrasonic probe and adjust to the optimum frequency; second, the installation position of the ultrasonic probe is changed. Increase ultrasonic treatment time.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TG249.2;TB552

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