【摘要】：隨著對新型棒材質量及性能的要求越來越高,棒材的控冷工藝也相應的更加精確。通過控制棒材水冷過程的溫度變化,可顯著改善棒材內部組織,得到更好的晶粒,提高棒材的強度和韌性。因此,研究棒材水冷過程的溫度變化有著重要的意義。本文利用有限元軟件建立了棒材水冷過程的數值模型,在改變入水水壓及入水角度的條件下,系統(tǒng)研究棒材冷卻時溫度變化的影響規(guī)律;通過對比分析并結合現場生產工藝,獲取了較優(yōu)的控冷參數;以理論研究為基礎,設計了一套棒材穿水冷卻實驗平臺;通過現場實驗對模擬得到的結果進行驗證。主要研究內容如下:首先,建立冷卻管和棒材的計算流體學模型。借助流體模擬軟件FLUENT,研究棒材水冷過程中,流體流動狀態(tài)及棒材的溫度變化。通過模擬可知,流體在經過冷卻管的收縮區(qū)和擴張區(qū)時,因速度差的原因會發(fā)生紊流,由于局部的紊流會打破冷卻水和棒材產生的蒸汽膜,使得棒材表面與冷卻水充分接觸,提高冷卻效果。同時,對棒材溫度場分析可知,棒材在冷卻水沖擊過程中,表面的溫度會急劇下降,當下降到一定溫度時,棒材的溫度將趨于一定值。其次,在改變水壓及入水角度的條件下,模擬棒材冷卻過程中溫度的變化。相同時間里,入水水壓對棒材的溫降影響很大,而角度影響較小,但角度設置過高反而會對棒材的降溫有一定的阻礙。通過模擬得到的數據,選擇合適的入水水壓及角度,為下文建立棒材穿水冷卻實驗平臺奠定基礎。然后,設計了包括加熱、輸送、冷卻棒材的實驗平臺。設計確定了電磁感應加熱器的加熱頻率、電源功率及線圈匝數;并計算選擇了輸送輥道及其電機。最后,通過棒材穿水冷卻的現場實驗驗證了棒材穿水冷卻模擬的結果有較高的可信度。
[Abstract]:With the higher quality and properties of the new bar, the cooling control process of the bar is more accurate. By controlling the temperature change of the bar during the water-cooling process, the internal structure of the bar can be significantly improved, better grain can be obtained, and the strength and toughness of the bar can be improved. Therefore, it is of great significance to study the temperature change in the process of bar water cooling. In this paper, the numerical model of bar water cooling process is established by using finite element software. Under the condition of changing the water pressure and angle of entry water, the influence law of bar cooling temperature is studied systematically. Through comparative analysis and combined with the field production process, the better controlled cooling parameters are obtained. Based on the theoretical research, a set of experimental platform for bar penetrating water cooling is designed, and the simulation results are verified by field experiments. The main contents are as follows: firstly, the computational fluid model of cooling tube and bar is established. The fluid flow state and the temperature change of the bar during the process of water cooling are studied by means of the fluid simulation software FLUENT,. The simulation results show that when the fluid passes through the cooling tube's contraction and expansion zone, turbulence will occur due to the difference in velocity, and the local turbulence will break the steam film produced by the cooling water and bar, so that the surface of the rod is in full contact with the cooling water. Improve cooling effect. At the same time, the analysis of the bar temperature field shows that the surface temperature of the bar will drop sharply during the impact of cooling water, and when the bar temperature drops to a certain temperature, the bar temperature will tend to a certain value. Secondly, under the condition of changing water pressure and water entry angle, the temperature change during bar cooling is simulated. At the same time, the water pressure has a great influence on the temperature drop of the bar, but the influence of the angle is small, but if the angle is too high, there will be some obstacles to the cooling of the bar. Through the data obtained by simulation, the suitable water pressure and angle are selected, which lays the foundation for the establishment of the experimental platform of bar penetrating water cooling below. Then, the experimental platform including heating, conveying and cooling bar is designed. The heating frequency, power supply and coil turns of the electromagnetic induction heater are determined, and the conveying roller table and its motor are calculated and selected. At last, the field experiment of bar penetrating water cooling proves that the simulation results of bar cross water cooling have high reliability.
【學位授予單位】：安徽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG335.62

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