基于虛擬樣機的高速精密壓力機設(shè)計技術(shù)研究
發(fā)布時間：2018-01-15 20:29
本文關(guān)鍵詞：基于虛擬樣機的高速精密壓力機設(shè)計技術(shù)研究 出處：《南京理工大學(xué)》2015年碩士論文 論文類型：學(xué)位論文
更多相關(guān)文章： 高速壓力機 虛擬樣機 振動 間隙 剛?cè)狁詈?/b> 下死點精度 田口法
【摘要】：高速壓力機是航空、航天、國防軍工、機械、電子、冶金等重要工業(yè)領(lǐng)域不可缺少的基礎(chǔ)制造裝備。隨著高速壓力機的高速化、精密化和自動化發(fā)展,振動及其帶來的精度問題成為制約高速精密壓力機發(fā)展的關(guān)鍵問題之一。本文以閉式高速精密壓力機為對象,以減小振動、提高下死點精度為目的,進行了高速壓力機結(jié)構(gòu)靜力學(xué)分析、模態(tài)分析、間隙多體動力學(xué)建模、動平衡設(shè)計、下死點精度分析。主要內(nèi)容包括：(1)首先運用ANSYS Workbench建立高速壓力機主傳動機構(gòu)和機身的有限元模型。對高速壓力機主傳動機構(gòu)進行靜力學(xué)分析,分析得出主連桿受力最大但強度滿足要求；主連桿的變形較大,對高速壓力機精度影響較大,故在后文研究中需考慮主連桿的柔性；對高速壓力機機身進行靜力學(xué)分析,得出機身強度滿足要求,床身有輕微變形,需加以改善。在ANSYS Workbench建立模態(tài)分析中的高速壓力機有限元模型,通過模態(tài)分析獲得固有頻率和固有振型,分析表明發(fā)生共振的可能性很小。(2)運用ADAMS建立高速壓力機剛體模型,建立動平衡機構(gòu)慣性力公式,分析并確定減小高速精密壓力機不平衡慣性力的方法,再在ADAMS中以主滑塊質(zhì)量為設(shè)計變量進行慣性力優(yōu)化,使不平衡慣性力最小,以獲得較好的動平衡效果,從而減小振動。(3)運用接觸碰撞法建立運動副間隙模型,采用L-N非線性彈簧阻尼模型確定間隙運動副的法向接觸碰撞力和C-H修正庫倫摩擦力模型確定間隙運動副的切向摩擦力,再在高速壓力機剛體模型中施加法向接觸碰撞力和切向摩擦力建立高速精密壓力機間隙剛體模型。運用ANSYS軟件生成主連桿的MNF文件,導(dǎo)入ADAMS中建立柔性主連桿并替代剛性主連桿,完成高速精密壓力機間隙剛?cè)狁詈夏Ｐ偷慕ⅰ７治龃_定下死點精度的主要影響因素,對主要因素進行單因素仿真分析得出其影響規(guī)律,再運用田口實驗法進行多因素仿真分析得出最優(yōu)的下死點精度結(jié)構(gòu)參數(shù)組合,為實際提高下死點精度提供參考。
[Abstract]:High speed press is an indispensable basic manufacturing equipment in aviation, aerospace, national defense military industry, machinery, electronics, metallurgy and other important industrial fields. With the development of high speed, precision and automation of high speed press. Vibration and its precision problems have become one of the key problems restricting the development of high speed precision press. This paper takes the closed high speed precision press as the object to reduce vibration and improve the precision of the lower dead point. Static analysis, modal analysis, multi-body dynamics modeling and dynamic balance design of high-speed press are carried out. Analysis of the accuracy of the lower dead point. The main contents include: 1). Firstly, the finite element model of main transmission mechanism and fuselage of high-speed press is established by ANSYS Workbench, and the statics analysis of main transmission mechanism of high-speed press is carried out. It is concluded that the force of the main connecting rod is the largest but the strength meets the requirements. The deformation of the main connecting rod is large and the precision of the high speed press is greatly affected, so the flexibility of the main connecting rod should be considered in the later research. The static analysis of the fuselage of the high-speed press shows that the strength of the fuselage meets the requirements and the bed has slight deformation. The finite element model of high-speed press in modal analysis is established in ANSYS Workbench, and the natural frequency and natural mode are obtained by modal analysis. The analysis shows that the possibility of resonance is very small. (2) the rigid body model of high speed press is established by ADAMS, and the inertia force formula of dynamic balancing mechanism is established. The method of reducing the unbalanced inertia force of high speed precision press is analyzed and determined. Then the inertia force is optimized with the main slider mass as the design variable in ADAMS to minimize the unbalanced inertial force. In order to obtain better dynamic balance effect and reduce vibration, the contact collision method is used to establish the clearance model of the motion pair. L-N nonlinear spring damping model is used to determine the normal contact impact force of the clearance pair and C-H modified Coulomb friction model is used to determine the tangential friction force of the clearance pair. Then the rigid body model of high speed precision press is established by applying normal contact collision force and tangential friction force to the rigid body model of high speed press. The MNF file of main connecting rod is generated by ANSYS software. The rigid and flexible coupling model of clearance of high speed precision press is established by introducing flexible main link into ADAMS and replacing rigid main connecting rod. The main influencing factors of dead point precision are analyzed and determined. The main factors are analyzed by single factor simulation and the influence law is obtained, and the optimal structure parameter combination of the lower dead point precision is obtained by using the Taguchi experiment method to carry out the multi-factor simulation analysis. It provides a reference for improving the precision of the lower dead point in practice.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG305
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