發(fā)布時(shí)間：2018-03-13 13:07

  本文選題：錐面夾具　切入點(diǎn)：薄壁零件　出處：《合肥工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：薄壁零件的加工精度要求往往較高,但由于其剛度低,易受夾緊力影響產(chǎn)生較大夾持變形而影響其加工精度。本文在分析薄壁零件定位和夾持特性的基礎(chǔ)之上,以減小薄壁零件的夾持變形提高其加工精度為目的,設(shè)計(jì)用于自動(dòng)車床上夾持薄壁零件的外抱式錐面彈性?shī)A具(以下簡(jiǎn)稱錐面彈性?shī)A具)。本文采用理論推導(dǎo)、有限元模擬計(jì)算以及回歸分析等方法,分析計(jì)算了錐面彈性?shī)A具的夾緊力和薄壁零件的夾持變形。具體研究?jī)?nèi)容如下:首先,根據(jù)薄壁零件定位和夾持特性,初步確立薄壁零件的夾持方案;并根據(jù)零件的加工要求設(shè)計(jì)了無(wú)軸向定位的錐面彈性?shī)A具和軸向定位的錐面彈性?shī)A具。其次,根據(jù)力學(xué)理論知識(shí)推導(dǎo)出某特定錐面彈性?shī)A具的夾緊力的理論計(jì)算公式;同時(shí)利用有限元軟件對(duì)該錐面彈性?shī)A具進(jìn)行了模擬計(jì)算,得到該錐面彈性?shī)A具的夾緊力;將有限元模擬計(jì)算求得的結(jié)果與理論計(jì)算公式求得的結(jié)果進(jìn)行對(duì)比,相對(duì)誤差15%,由此驗(yàn)證本文有限元模擬計(jì)算方法的正確性。最后,運(yùn)用正交試驗(yàn)表安排計(jì)算參數(shù)(夾具的錐面半錐角、關(guān)鍵結(jié)構(gòu)尺寸;軸向拉緊力;零件的外徑、被夾持長(zhǎng)度和壁厚等),對(duì)本文的外抱式錐面彈性?shī)A具夾持薄壁零件進(jìn)行有限元模擬計(jì)算,得到錐面彈性?shī)A具夾持薄壁零件的夾緊力和薄壁零件的夾持變形;根據(jù)有限元模擬計(jì)算結(jié)果,利用回歸分析方法建立錐面彈性?shī)A具的夾緊力和薄壁零件的夾持變形的數(shù)學(xué)模型,為錐面彈性?shī)A具的參數(shù)設(shè)計(jì)以及薄壁零件的夾持變形預(yù)測(cè)提供參考。
[Abstract]:The machining precision of thin-wall parts requirements are often higher, but because of its low stiffness, easy clamping force influence and affect the machining accuracy of large clamping deformation. Based on the analysis of the positioning and clamping characteristics of thin-walled parts, in order to reduce the clamping deformation of thin-walled parts to improve the machining precision for the purpose of design for automatic lathe clamping thin-walled parts holding type cone elastic fixture (hereinafter referred to as the cone elastic fixture). This paper uses theoretical analysis, finite element simulation and regression analysis method, analysis and calculation of the cone elastic fixture clamping force and the clamping deformation of thin-walled parts. The specific contents are as follows: firstly, according to the thin wall the parts and clamping characteristics, the initial establishment of a program to clamp the thin-walled parts; and the design of cone cone elastic elastic fixture and axial positioning without axial positioning clamp according to the processing requirements of parts Out. Secondly, according to the calculation formula of mechanics theory knowledge derived from a particular elastic clamping force of the clamp cone theory; the cone elastic fixture was simulated using finite element software, get the clamping force of the conical elastic fixture; finite element simulation results obtained with the results obtained by theoretical calculation formula contrast, the relative error of 15%, which verify the correctness of the finite element simulation method. Finally, using the orthogonal test table arrangement parameters (half cone angle of the conical fixture, key structural dimensions; axial tension; parts of the outer diameter of the clamped length and wall thickness), the holding type cone elastic clamping thin-walled parts of finite element simulation to deformation of clamp force cone elastic clamp of thin-walled parts and thin-walled parts; based on the finite element analysis results by regression The mathematical model of clamping force and clamping deformation of thin-walled elastic fixture is established based on the analysis method, which provides reference for parameter design of cone elastic fixture and prediction of clamping deformation of thin-walled parts.

【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG751.1

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