發(fā)布時間：2018-04-25 03:41

  本文選題：汽車圍板 + 拼焊板��； 參考：《沈陽理工大學(xué)》2015年碩士論文

【摘要】：汽車輕量化是最近幾年的研究熱點。傳統(tǒng)的汽車覆蓋件的成形方法分為分離成形法和整體成形法。前者的特點為模具較多,工藝復(fù)雜,后者的工藝簡單但增加了車身的重量。拼焊板避免了兩者的缺點,同時達到輕量化的目的。拼焊板是將不同厚度和力學(xué)性能的兩塊或以上板材通過焊接的方法得到所需要的板材,但拼焊板增大了成形時的難度。大量研究表明焊縫對拼焊板成形能力有較大影響。本文從工藝補充造型、壓邊力大小、焊縫位置、拉延筋這幾個方面進行分析,控制焊縫的移動,防止成形缺陷的發(fā)生,從而得到合格的拉延零件。本文應(yīng)用AUTOFORM軟件進行汽車圍板拉延成形的數(shù)值模擬分析。對圍板三維模型進行工藝補充時,首先選取無沖壓負角的沖壓方向,而后進行內(nèi)工藝補充和外工藝補充。最終選定用拉延阻力最大的特征截面線來生成工藝補充面。制作完工藝補充后,在AUTOFORM中對拉延工藝參數(shù)進行模擬。首先利用一步法反計算毛坯的大小,對材料為DC04,厚度為0.8mm的板材拉延成形進行模擬分析,得出合理的壓邊力大小,為拼焊板做基礎(chǔ)。選定材料為DC04/B280vk,厚度為0.8/1.2mm的拼焊板的拉延過程進行模擬分析,主要從焊縫位置和壓邊力大小兩方面做了研究。當(dāng)焊縫處于中心位置時正好位于變形最劇烈的位置,成形性不理想。將焊縫位置移動20mm后,選定壓邊力為450KN時,模擬結(jié)果表明成形效果較理想。根據(jù)模擬所得到的虛擬拉延筋參數(shù)可得到真實拉延筋參數(shù),用UG軟件設(shè)計真實拉延筋,重新模擬,得到更加接近實際的結(jié)果。用UG制作汽車圍板的拉延成形模具三維模型,加工拉延模具,根據(jù)模擬得出的工藝參數(shù),進行實驗驗證。試沖結(jié)果較理想,實驗結(jié)果和模擬結(jié)果相一致,驗證了模擬結(jié)果的正確性。拉延完成后,經(jīng)過沖孔、側(cè)沖孔、切邊、修邊、翻邊、整形后得到最終成品零件。
[Abstract]:Automobile lightweight is a hot research topic in recent years. The traditional forming method of automobile panel is divided into separate forming method and integral forming method. The former is characterized by more molds and complex processes, while the latter is simple but increases the weight of the body. The TWBS avoids the disadvantages of both and achieves the goal of lightweight at the same time. Two or more plates with different thickness and mechanical properties are used to obtain the required plates by welding method, but the TWBs increase the difficulty of forming. A large number of studies show that the weld has a great effect on the forming ability of TWF. In this paper, the process supplementary modeling, the size of the blank holder force, the position of the weld seam and the drawing bar are analyzed to control the movement of the weld seam and prevent the forming defects, so as to obtain the qualified drawing parts. In this paper, AUTOFORM software is used to simulate and analyze the drawing forming of automobile coaming plate. In the process supplement of 3D model of coaming plate, the stamping direction without negative angle of stamping is first selected, and then the internal process supplement and external process supplement are carried out. Finally, the feature cross section line with the largest drawing resistance is selected to generate the process supplementary surface. After finishing the process supplement, the drawing process parameters are simulated in AUTOFORM. First, the blank size is calculated by one step method, and the sheet metal drawing forming with DC04 material and 0.8mm thickness is simulated and analyzed, and the reasonable blank holder force is obtained, which is the foundation of the TWBS. The drawing process of TWB with thickness of 0.8/1.2mm is simulated and analyzed by using DC04 / B280vkk material, which is mainly studied from two aspects: the position of weld seam and the size of blank holder force. When the weld is in the center position, it is in the most deformed position, and the formability is not ideal. The simulation results show that the forming effect is satisfactory when the position of weld is moved to 20mm and the blank holder force is chosen as 450KN. According to the virtual drawing bar parameters obtained by simulation, the real drawing bar parameters can be obtained, and the real drawing bars are designed by UG software. The simulation results are closer to the actual results. The 3D model of drawing forming die of automobile coaming plate was made by UG, and the drawing die was processed, and the experiment was carried out according to the process parameters obtained by simulation. The experimental results are in good agreement with the simulation results, and the correctness of the simulation results is verified. After drawing, through punching, side punching, cutting, trimming, flanging, shaping to get the final parts.
【學(xué)位授予單位】：沈陽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U466;TG379

【參考文獻】

相關(guān)期刊論文 前4條

1 李福祿,田福祥;汽車覆蓋件沖壓工藝及其仿真軟件的現(xiàn)狀與發(fā)展[J];汽車工藝與材料;2005年07期

2 陳中奎,施法中;板料沖壓成形過程有限元分析中的接觸搜索算法[J];塑性工程學(xué)報;2000年02期

3 鄭金橋 ,黃勇 ,王義林 ,李志剛;汽車覆蓋件沖壓工藝設(shè)計現(xiàn)狀及發(fā)展趨勢[J];塑性工程學(xué)報;2003年06期

4 鄭瑩，吳勇國，李尚健，李志剛，，肖景容;板料成形數(shù)值模擬進展[J];塑性工程學(xué)報;1996年04期

本文編號：1799621