【摘要】：目前,對于數(shù)控漸進(jìn)成形質(zhì)量影響因素的研究大都是從進(jìn)給參數(shù)、層間距、成形工具尺寸等方面進(jìn)行分析。并且,評價指標(biāo)也都是從厚度或者表面粗糙度單方面進(jìn)行考慮的,還沒有從成形方式、成形支撐模完整性以及成形軌跡等方面來綜合考慮數(shù)控漸進(jìn)成形制件的輪廓精度、表面質(zhì)量等成形質(zhì)量指標(biāo)。本文所研究的數(shù)控漸進(jìn)成形質(zhì)量影響因素針對成形方式、支撐模完整性和成形軌跡方面,研究了具體的成形方案設(shè)計和軌跡規(guī)劃,通過有限元分析和實際成形實驗,探討了各個因素對板材成形質(zhì)量的具體影響,給出各因素參數(shù)的最優(yōu)選擇,為漸進(jìn)成形技術(shù)的各參數(shù)設(shè)定與優(yōu)化提供有力依據(jù),為此技術(shù)的研究與實際應(yīng)用推廣提供技術(shù)基礎(chǔ)。首先,針對異形板材件的成形,進(jìn)行了成形方式的創(chuàng)新。對于雙凸板材件的成形,提出了基于雙面擠壓的雙凸板材件數(shù)控漸進(jìn)反向成形方法,研究了雙凸板材件的成形工藝方案;對于單一正向或反向漸進(jìn)成形不能成形的板材件,提出一種正向成形與反向成形復(fù)合的成形方法,研究出了該成形方法中三種成形順序:反向-正向成形、正向-反向成形、正向/反向并行成形的確定與規(guī)劃。其次,為解決數(shù)控漸進(jìn)成形時是否采用支撐以及采用何種類型支撐的問題,探討了支撐模的完整性對成形質(zhì)量的影響。以典型板材件為研究對象,分別采用整體支撐模、部分支撐模和無底支撐模三種支撐類型進(jìn)行成形質(zhì)量分析。再次,通過對比分析數(shù)控漸進(jìn)成形件和數(shù)控銑削件的表面殘留高度,研究了數(shù)控銑削加工模式中殘留高度計算方法在數(shù)控漸進(jìn)成形中的可應(yīng)用性,以及等殘留高度軌跡在數(shù)控漸進(jìn)成形中的適用性。第四,為提高數(shù)控漸進(jìn)成形中成形件輪廓的尺寸精度和表面質(zhì)量,提出了一種通過二次擠壓加工來修正由于反彈變形引起的尺寸誤差和消除殘留痕跡的成形工藝,并給出了通過識別殘留痕跡波峰來生成一個能夠使擠壓工具準(zhǔn)確擠壓殘留痕跡波峰的二次擠壓成形軌跡規(guī)劃和生成方法。最后,應(yīng)用ANSYS/LS-DYNA有限元分析軟件分別對以上所提方法的成形過程進(jìn)行漸進(jìn)成形數(shù)值模擬,對成形輪廓精度進(jìn)行了分析。同時,分別進(jìn)行了成形實驗,更進(jìn)一步對所提出的理論方法進(jìn)行了驗證。
[Abstract]:At present, the research on the influence factors of NC progressive forming quality is mainly from the aspects of feed parameters, layer spacing, forming tool size and so on. Moreover, the evaluation indexes are considered unilaterally from thickness or surface roughness, and the contour accuracy of NC incremental forming parts is not considered synthetically from the aspects of forming mode, forming support die integrity and forming track, etc. Surface quality and other forming quality indicators. In this paper, the influencing factors of NC incremental forming quality are studied, including the forming mode, the integrity of supporting die and the forming track. The specific forming scheme design and trajectory planning are studied. The finite element analysis and the actual forming experiment are carried out. The influence of various factors on the forming quality of sheet metal is discussed, and the optimal selection of each factor parameter is given, which provides a powerful basis for setting and optimizing the parameters of incremental forming technology, and provides the technical basis for the research and practical application of the technology. Firstly, the forming method of special-shaped sheet metal is innovated. For the forming of double convex sheet metal, the NC incremental reverse forming method based on double face extrusion is put forward, and the forming process scheme of double convex sheet metal is studied. For sheet metal which can not be formed by single forward or reverse progressive forming, a compound forming method of forward forming and reverse forming is put forward, and three kinds of forming sequences in this forming method are studied: reverse forward forming, forward reverse forming. The determination and planning of forward / reverse parallel forming. Secondly, in order to solve the problem of whether and what type of brace is used in NC progressive forming, the influence of the integrity of bracing die on forming quality is discussed. Taking the typical sheet metal as the research object, the forming quality analysis was carried out by adopting three kinds of supporting die, I. e., integral supporting die, partial supporting die and unsupported die. Thirdly, by comparing and analyzing the surface residual height of NC incremental forming parts and NC milling parts, the applicability of residual height calculation method in NC progressive forming is studied. And the applicability of equal residual height locus in NC incremental forming. Fourthly, in order to improve the dimension accuracy and surface quality of the profile in NC progressive forming, a new forming process is proposed to correct the dimension error caused by rebound deformation and eliminate the residual trace by secondary extrusion processing. In addition, a method to generate the residual trace wave peak by identifying the residual trace wave peak is presented, which can make the extrusion tool accurately extrude the residual trace wave peak, and the planning and generation method of the secondary extrusion forming trajectory are also given. Finally, the ANSYS/LS-DYNA finite element analysis software is used to simulate the forming process of the above method, and the precision of the profile is analyzed. At the same time, the forming experiments were carried out respectively, and the theoretical method was further verified.
【學(xué)位授予單位】：沈陽航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG306

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本文編號：2349156