本文選題：沖壓成形 + 離散壓邊��； 參考：《吉林大學(xué)》2016年碩士論文

【摘要】：沖壓成形作為板料成形領(lǐng)域應(yīng)用最廣的一類生產(chǎn)工藝,具有制件美觀、尺寸穩(wěn)定、生產(chǎn)率高等一系列優(yōu)點(diǎn)。對(duì)于市場(chǎng)上大多數(shù)沖壓件,拉深過程中通常需要設(shè)置壓邊裝置配合模具完成零件的成形,壓邊形式以及壓邊力設(shè)置合理與否顯著影響其成形性能。整體壓邊工藝可以保證形狀簡(jiǎn)單的零件的成形性能,而由于形狀復(fù)雜的零件材料流動(dòng)復(fù)雜,變形程度不一致,易導(dǎo)致起皺、破裂等缺陷產(chǎn)生。隨著復(fù)雜曲面零件和各種高強(qiáng)度材料的面世,整體壓邊工藝已難以保證其成形性能。在壓邊裝置設(shè)計(jì)中融入多點(diǎn)成形中的離散化思想,可以將傳統(tǒng)沖壓工藝中的整體壓邊圈離散化,使用相互獨(dú)立的壓邊塊進(jìn)行有序組合,作為通用的離散壓邊裝置。通過對(duì)不同變形區(qū)域壓邊力大小的合理調(diào)整,可有效改善起皺、破裂等缺陷,提高成形性能。本文主要研究?jī)?nèi)容和結(jié)論如下:1、建立有限元數(shù)值模擬模型建立了盒形件在整體壓邊和離散壓邊兩種壓邊工藝時(shí)的有限元模型和復(fù)雜曲面件離散壓邊有限元模型,對(duì)邊界條件、接觸設(shè)置及網(wǎng)格劃分等對(duì)計(jì)算結(jié)果有顯著影響的設(shè)置進(jìn)行了詳細(xì)討論。2、盒形件整體壓邊和離散壓邊成形性能對(duì)比分析從厚度分布和成形深度等角度對(duì)兩種壓邊工藝成形性能進(jìn)行了對(duì)比分析。同等成形深度下,兩種工藝成形后的零件厚度分布差異較小;最大成形深度方面,離散壓邊成形深度達(dá)到80mm,與整體壓邊相比提高了一倍,證明離散壓邊工藝通過調(diào)整壓邊力分布可以有效提高成形性能。3、工藝參數(shù)對(duì)深拉深盒形件離散壓邊成形性能的影響分析探究離散壓邊工藝成形深度為70mm的盒形件時(shí),坯料尺寸和形狀、坯料和柔性壓邊圈間摩擦系數(shù)以及柔性壓邊圈厚度對(duì)成形性能的影響。成形深度較大時(shí),坯料尺寸和形狀、坯料和柔性壓邊圈間摩擦系數(shù)對(duì)盒形件成形性能的影響較為顯著,柔性壓邊圈厚度對(duì)盒形件成形性能的影響較小。4、復(fù)雜曲面件離散壓邊沖壓成形性能研究利用數(shù)值模擬方法探究復(fù)雜曲面件采用離散壓邊工藝時(shí)的成形性能。通過綜合考量各因素成形結(jié)果,經(jīng)過不斷調(diào)整參數(shù),得到了采用離散壓邊工藝的優(yōu)化數(shù)值模擬成形結(jié)果,并對(duì)該成形結(jié)果進(jìn)行了數(shù)值模擬結(jié)果驗(yàn)證,證明離散壓邊工藝可有效提高復(fù)雜曲面件的成形性能。
[Abstract]:As the most widely used production technology in sheet metal forming, stamping forming has a series of advantages, such as beautiful parts, stable size, high productivity and so on. For the majority of stamping parts in the market, it is usually necessary to set the blank holder device to complete the forming of the part with the die during the drawing process, and the shape of the blank holder and the setting of the blank holder force have a significant effect on the forming performance of the blank holder. The integral blank pressing process can guarantee the formability of the parts with simple shape, but because the material flow of the parts with complicated shape is complicated and the degree of deformation is not consistent, the defects such as wrinkling and cracking are easy to occur. With the appearance of complex curved surface parts and various high strength materials, it is difficult to guarantee the formability of the whole blank holder technology. The idea of discretization in multi-point forming can be incorporated into the design of the blank holder, and the integral blank holder can be discretized in the traditional stamping process, and the mutually independent blank holder can be combined in an orderly manner, which can be used as a general discrete blank holder. Through the reasonable adjustment of the blank holder force in different deformation regions, the wrinkling and cracking defects can be effectively improved and the formability can be improved. The main contents and conclusions of this paper are as follows: 1. The numerical simulation model of finite element is established. The finite element model of the box-shaped parts in the whole and discrete blank holder processes and the discrete blank holder finite element model of complex curved parts are established, and the boundary conditions are also discussed. This paper discusses in detail the setting of contact setting and mesh generation, which have a significant influence on the calculation results. The comparison and analysis of the overall and discrete blank holder formability of box-shaped parts from the angle of thickness distribution and forming depth are carried out to analyze the two kinds of blank holder workpieces from the point of view of thickness distribution and forming depth. The formability was compared and analyzed. At the same forming depth, the difference of the thickness distribution between the two processes is small. In the maximum forming depth, the discrete blank holder depth is 80 mm, which is twice as high as that of the whole blank holder. It is proved that the discrete blank holder process can effectively improve the formability by adjusting the distribution of the blank holder force, and the influence of the process parameters on the forming performance of the discrete blank holder of deep drawing box parts is analyzed. When the forming depth of the discrete blank holder process is 70mm, it is found that the forming depth of the discrete blank holder is 70mm. The influence of the size and shape of the blank, the friction coefficient between the blank and the flexible blank holder ring and the thickness of the flexible blank holder ring on the formability. When the forming depth is high, the size and shape of the blank and the friction coefficient between the blank and the flexible blank holder ring have a significant effect on the forming properties of the box parts. The influence of the thickness of the flexible blank holder on the formability of box parts is small. 4. The research on the forming performance of complex curved parts with discrete blank holder using numerical simulation method is carried out to explore the formability of complex curved parts with discrete blank holder. After considering the forming results of various factors and adjusting the parameters continuously, the optimized numerical simulation results using discrete blank holder process are obtained, and the results are verified by the numerical simulation results. It is proved that the discrete blank holder process can effectively improve the formability of complex curved surface parts.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG386

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 Liu Nan;Yang He;Li Heng;Yan Siliang;;Plastic wrinkling prediction in thin-walled part forming process: A review[J];Chinese Journal of Aeronautics;2016年01期

2 Sheng-Hua Wu;Nan-Nan Song;Francisco M.Andrade Pires;Abel D.Santos;;Prediction of Forming Limit Diagrams for Materials with HCP Structure[J];Acta Metallurgica Sinica(English Letters);2015年12期

3 Shi-Hong Zhang;Shuai-Feng Chen;Yan Ma;Hong-Wu Song;Ming Cheng;;Developments of New Sheet Metal Forming Technology and Theory in China[J];Acta Metallurgica Sinica(English Letters);2015年12期

4 Haoyuan GUO;Liyuan ZHANG;Yajun YIN;Yongxin GAO;;Relations between cubic equation, stress tensor decomposition, and von Mises yield criterion[J];Applied Mathematics and Mechanics(English Edition);2015年10期

5 王衛(wèi)衛(wèi);李穎;賈彬彬;;鞍面力-位移分控多點(diǎn)成形起皺的數(shù)值模擬研究[J];鍛壓技術(shù);2015年05期

6 李二玲;鄧沛然;楊尚磊;曹陽(yáng)根;王殊尋;;薄板拉深過程中壓邊力與破裂關(guān)系的研究[J];鍛壓技術(shù);2014年06期

7 JIA Zhenyuan;WANG Fuji;WANG Yongqing;GUO Dongming;;Explicit Correlation Model of Multi-source Constraints for Re-design Parts with Complex Curved Surface[J];Chinese Journal of Mechanical Engineering;2014年02期

8 Jie Wu;Zengsheng Ma;Yichun Zhou;Chunsheng Lu;;Prediction of Failure Modes during Deep Drawing of Metal Sheets with Nickel Coating[J];Journal of Materials Science & Technology;2013年11期

9 Song Feifei;Yang He;Li Heng;Zhan Mei;Li Guangjun;;Springback prediction of thick-walled high-strength titanium tube bending[J];Chinese Journal of Aeronautics;2013年05期

10 王進(jìn);姜虎森;陶龍;王寶平;;板料漸進(jìn)成形極限圖測(cè)試方法研究[J];鍛壓技術(shù);2013年02期

，

本文編號(hào)：1964627