本文選題：沖裁　切入點：沖裁力　出處：《濟南大學》2017年碩士論文　論文類型：學位論文

【摘要】：沖裁是指利用安裝在壓力機機身上的模具使得板料沿一定的沖裁輪廓線產生相互分離的工序,一般包含沖孔和落料。由于沖裁工藝方便、高效,在實際生產中,得到了廣泛的應用。沖裁力是用來選取設備型號,設計模具以及校核沖頭強度的重要依據。隨著沖壓技術的快速發(fā)展,各種沖裁工藝(如厚板沖裁、高強度鋼板沖裁)對沖裁力的精準確定,沖裁力的發(fā)展過程提出了更高的要求。所以,沖裁力的研究對于擴展沖裁基礎理論具有一定的理論價值,對于高強板沖壓、厚板沖裁等工藝具有工程應用意義。本文以沖裁工藝為研究對象,開展了沖裁力理論分析、實驗研究以及數值模擬。主要研究內容及結果如下:(1)以沖裁工藝為研究對象,開展了沖裁力的理論分析,建立了較為精確的沖裁力理論計算公式,為豐富沖裁理論提供了支撐。通過運用滑移線場理論,分析板料的受力狀態(tài),建立力學分析模型,推導獲得了最大沖裁力理論計算公式;通過運用上限法,建立力學分析模型,推導獲得了沖裁過程作用力的理論計算公式,分析了沖裁力隨沖頭行程的變化規(guī)律,獲得了板料厚度、沖裁間隙等工藝參數對沖裁力的影響規(guī)律。(2)在室溫條件下,開展了沖裁力的實驗研究,設計了實驗方案和實驗裝置,驗證了理論公式的準確性,闡明了沖裁力的影響因素及規(guī)律。通過分析實驗獲得的沖裁力行程曲線以及最大沖裁力,總結了不同工藝參數如板料厚度、沖裁間隙以及沖裁速度對沖裁力的影響規(guī)律;通過對比實驗與理論計算的結果,驗證了推導出的沖裁力理論計算公式的正確性。(3)運用有限元分析軟件ANSYS/LS-DYNA,開展了沖裁過程的數值模擬。建立沖裁過程有限元分析模型,獲得了沖裁力的仿真曲線以及最大沖裁力。綜合分析了數值模擬、實驗研究以及理論計算的沖裁力結果。綜上所述,本文基于滑移線法與上限法獲得了沖裁力理論計算公式,通過開展沖裁力實驗研究,驗證了理論公式的準確性;通過理論分析、實驗研究和數值模擬,闡明了沖裁間隙、板料厚度等工藝參數對沖裁力的影響規(guī)律。
[Abstract]:Blanking refers to the use of the die installed on the body of the press to make the sheet metal separate from each other along a certain blanking profile, generally including punching and blanking. Due to the convenience and efficiency of the blanking process, the blanking process is used in actual production. Blanking force is an important basis for selecting equipment type, designing die and checking punch strength. With the rapid development of stamping technology, various blanking processes (such as thick plate blanking, etc.). Therefore, the research of blanking force has certain theoretical value for expanding the basic theory of blanking, and is of certain theoretical value for high strength sheet stamping. The blanking technology of thick plate has engineering application significance. In this paper, the theoretical analysis, experimental study and numerical simulation of blanking force are carried out. The main research contents and results are as follows: (1) the blanking process is taken as the research object. The theoretical analysis of blanking force is carried out, and a more accurate formula for calculating punching force is established, which provides the support for enriching blanking theory. By using the theory of slip line field, the mechanical analysis model is established by analyzing the stress state of sheet metal. The theoretical formula for calculating the maximum blanking force is derived, the mechanical analysis model is established by using the upper bound method, the theoretical calculation formula of the force in the blanking process is derived, and the variation law of the blanking force with the stroke of the punching head is analyzed. The experimental research of blanking force was carried out at room temperature. The experimental scheme and experimental device were designed to verify the accuracy of the theoretical formula. By analyzing the stroke curve of blanking force and the maximum blanking force obtained by experiments, the influence laws of different technological parameters such as sheet thickness, blanking clearance and blanking speed are summarized. By comparing the results of experiment and theoretical calculation, the correctness of the theoretical formula of blanking force is verified. The numerical simulation of blanking process is carried out by using the finite element analysis software ANSYS / LS-DYNA.The finite element analysis model of blanking process is established. The simulation curve of blanking force and the maximum blanking force are obtained. The results of numerical simulation, experimental study and theoretical calculation of blanking force are synthetically analyzed. In summary, based on the slip line method and upper bound method, the theoretical calculation formula of blanking force is obtained. The accuracy of the theoretical formula is verified by the experimental study of blanking force, and the influence of blanking clearance and sheet thickness on the blanking force is clarified by theoretical analysis, experimental study and numerical simulation.
【學位授予單位】：濟南大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG386.2

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