本文選題：充液拉深 + 數(shù)值模擬　； 參考：《長春工業(yè)大學》2015年碩士論文

【摘要】：隨著汽車工業(yè)的快速發(fā)展,汽車覆蓋件的形狀越來越多樣化,精密成形使得企業(yè)對汽車覆蓋件的成形精度要求越來越高,傳統(tǒng)的沖壓工藝已經(jīng)難以滿足市場需求,急需一種先進的板料成形工藝來適應多樣化的生產(chǎn)。充液拉深作為一種軟膜成形技術(shù),成形工序精簡,制件質(zhì)量成形精度高,模具研發(fā)成本低,研發(fā)周期短,對于復雜零件和拉深比較大的零件具有獨特的優(yōu)勢。然而由于各種客觀條件的影響,汽車覆蓋件領(lǐng)域的充液成形技術(shù)在我國并未得到充分的應用與發(fā)展,文章以油箱底殼為主要研究對象探究其充液成形過程中關(guān)鍵工藝參數(shù)對成形的影響。針對油箱底殼的形狀特點利用數(shù)值模擬軟件Dynaform對三維軟件建立的數(shù)模進行工藝補充面和壓料面設(shè)計,建立合理的模具模型。利用普通沖壓拉深成形的方法確定成形過程中合理的拉延筋布置方法。在普通拉深確定的工藝參數(shù)基礎(chǔ)上,采用定間隙的壓邊方式確定合適的液室壓力加載路徑,分析不同的液室壓力加載對油箱底殼成形質(zhì)量的影響,確定最合理的液室壓力加載方式。利用壓邊力壓邊的方法,探討液室壓力加載路徑與壓邊力加載之間的匹配關(guān)系。為了得出壓邊間隙的作用,在充液拉深條件下,選取不同的壓邊間隙進行進一步分析。以零件的厚度分布圖、減薄率、成形極限圖等評價指標對分段等效拉延筋的普通拉深、在液室壓力加載曲線四下壓邊間隙為1.32mm的充液拉深、在液室壓力加載曲線四下變壓邊力模擬的充液拉深進行對比研究,最終得出在合理的液室壓力加載條件下定間隙的充液拉深工藝具有特有的優(yōu)勢,零件的成性缺陷得到有效的消除,可以有效的減小零件的減薄和提升零件的均勻性,得出高精度的制件。最后對拉延筋的布置進行進一步研究,利用普通拉深確定的工藝參數(shù)設(shè)置真實拉延筋進行模擬,提升模擬的真實性。
[Abstract]:With the rapid development of automobile industry, the shape of automobile panels is becoming more and more diversified. Precision forming makes the precision of automobile panels more and more high. The traditional stamping technology has been difficult to meet the needs of the market. An advanced sheet metal forming process is urgently needed to adapt to diversified production. As a kind of soft film forming technology, liquid-filled drawing has advantages of simple forming procedure, high forming precision, low cost of die research and development, short R & D cycle, and has unique advantages for complex parts and parts with large drawing depth. However, due to the influence of various objective conditions, the liquid-filled forming technology in the field of automobile panels has not been fully applied and developed in China. In this paper, the main research object is the bottom shell of oil tank. According to the shape characteristics of the bottom shell of the oil tank, the numerical simulation software Dynaform is used to design the process supplement surface and the pressing surface of the digital model established by the three-dimensional software, and a reasonable die model is established. The reasonable arrangement method of drawing bars in forming process is determined by the common drawing forming method. On the basis of the process parameters determined by ordinary drawing, the proper pressure loading path of the tank is determined by the blank holder with fixed clearance, and the influence of different pressure loading on the forming quality of the bottom shell of the oil tank is analyzed. Determine the most reasonable pressure loading method for the chamber. The matching relationship between the pressure loading path of liquid chamber and the load of blank holder force is discussed by using the method of edge holder force. In order to obtain the effect of blank holder clearance, different blank holder clearance is selected for further analysis under the condition of liquid-filled drawing. Based on the thickness distribution diagram, thinning rate, forming limit diagram and other evaluation indexes, the ordinary drawing of the segment equivalent drawing bar is made, and the blank blanking clearance is 1.32mm 's liquid filled drawing under the pressure loading curve of the liquid chamber. Under the pressure loading curve of the liquid chamber, the liquid filling drawing simulated by the variable blank holding force is compared and studied. Finally, it is concluded that under the reasonable pressure loading condition of the liquid chamber, the liquid filling drawing process with fixed gap has its own advantages. The effective elimination of the forming defects of the parts can effectively reduce the thinning of the parts and enhance the uniformity of the parts, and get the high precision parts. Finally, the layout of drawing tendons is further studied, and the real drawing bars are set up with the process parameters determined by ordinary drawing to improve the authenticity of the simulation.
【學位授予單位】：長春工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG386;U466

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