本文關(guān)鍵詞： 復(fù)雜尺寸鏈 公差建模 敏感度 貢獻(xiàn)度 CETOL6σ　出處：《安徽農(nóng)業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：課題研究內(nèi)容是選取三個典型機(jī)構(gòu),分別對其建立復(fù)雜尺寸鏈,運(yùn)用基于CATIA的公差分析軟件CETOL6σ,在三維實(shí)體模型的基礎(chǔ)上建立三維公差模型并分析計算得到結(jié)果,將尺寸鏈理論算法與軟件的計算結(jié)果進(jìn)行對比,根據(jù)評估結(jié)果進(jìn)行優(yōu)化,此外還利用軟件的計算結(jié)果分析了各個尺寸鏈中組成環(huán)的貢獻(xiàn)度和敏感度。主要內(nèi)容如下:1)主要是以犁刀變速齒輪箱為例,對箱體安裝平面的四個安裝孔的位置精度提出了三種不同的標(biāo)注方法,并利用基于CATIA的公差分析軟件CETOL6σ建立三維公差模型,對三種標(biāo)注方法分別進(jìn)行分析,利用尺寸精度控制成組孔的位置精度會造成累計誤差,利用位置度并實(shí)行最大實(shí)體要求控制成組孔的位置精度能夠保證零件的互換性,擴(kuò)大位置度公差,提高合格率,降低成本,為產(chǎn)品的設(shè)計提供了一定的指導(dǎo)。2)對一曲柄滑塊機(jī)構(gòu)進(jìn)行運(yùn)動學(xué)及動力學(xué)的理論分析,建立了裝配尺寸鏈并結(jié)合公差分析軟件CETOL,對曲柄滑塊機(jī)構(gòu)的滑塊的裝配偏差進(jìn)行分析,并對分析結(jié)果的敏感度和貢獻(xiàn)度進(jìn)行討論�？芍�,按照極值法和統(tǒng)計法分析滑塊A面與支架的B面之間的距離都在設(shè)計范圍內(nèi),也表示理論計算值在CETOL的結(jié)果分布范圍內(nèi),并且得出在理想狀態(tài)下,該曲柄滑塊機(jī)構(gòu)的運(yùn)動軌跡偏差大小為+0.285mm~-0.295mm的結(jié)論。3)將PF4-CFT三維模型進(jìn)行簡化后,分別從T方向和Z方向兩個方面分析了超導(dǎo)母線安裝過程中可能會出現(xiàn)的誤差,建立T方向和Z方向的尺寸鏈并利用公差分析軟件建立公差模型,在Z方向槽的位置變化導(dǎo)致隔板的變化角度大于間隙造成的變化量,隔板在Z軸方向的平移的最大距離可達(dá)到4.1mm,因?yàn)槌瑢?dǎo)母線是安裝在支撐板上,如果要保證其安裝,則必須將超導(dǎo)母線與支撐這就只有采取在支撐板上加點(diǎn)墊片來保證安裝。而在T方向由于安裝孔的位置變化會直接關(guān)系到超導(dǎo)母線的安裝,而安裝孔的位置與槽底面的距離會發(fā)生變化,所以以孔1和孔21為例,利用CETOL分析得到在孔1及孔21位置的安裝誤差可能達(dá)到2.741mm和2.73mm,必須通過修正裝夾的裝置來彌補(bǔ)誤差。
[Abstract]:In this paper, three typical mechanisms are selected to establish the complex dimension chain, and the tolerance analysis software CETOL6 蟽 based on CATIA is used. The three-dimensional tolerance model is established based on the three-dimensional solid model and the results are analyzed and calculated. The size chain theory algorithm is compared with the calculation results of the software and optimized according to the evaluation results. In addition, the contribution and sensitivity of the ring in each dimension chain are analyzed by using the calculation results of the software. The main contents are as follows: 1) the main example is the variable speed gearbox of the plow cutter. This paper presents three different marking methods for the position accuracy of four mounting holes in the mounting plane of the box, and establishes a three-dimensional tolerance model by using the tolerance analysis software CETOL6 蟽 based on CATIA. The three labeling methods are analyzed, and the accumulative error will be caused by controlling the position accuracy of the group holes by using the dimension accuracy. Using the position degree and implementing the maximum entity requirement to control the position accuracy of the group holes can guarantee the interchangeability of the parts, enlarge the tolerance of the position degree, increase the qualified rate and reduce the cost. The kinematics and dynamics of a crank slider mechanism are analyzed theoretically, and the assembly dimension chain is established and combined with the tolerance analysis software CETOL. The assembly deviation of the slider of the crank slider mechanism is analyzed, and the sensitivity and contribution of the analysis result are discussed. According to extreme value method and statistical method, the distance between A plane of slide block and B plane of bracket is in the design range, which also indicates that the theoretical calculation value is in the distribution range of CETOL result, and the result is obtained in ideal state. The conclusion that the track deviation of the crank slider mechanism is 0.285 mm -0.295 mm) simplifies the three-dimensional model of PF4-CFT. The possible errors in superconducting busbar installation are analyzed from T direction and Z direction respectively. The dimension chain in T direction and Z direction is established and tolerance model is established by using tolerance analysis software. The angle of the diaphragm is larger than that of the gap, and the maximum distance of the partition in the Z axis can reach 4.1 mm, because the superconducting bus is installed on the supporting plate. If it is to be installed, the superconducting busbar and brace must be added to the supporting plate to ensure the installation. However, due to the location change of the mounting hole in the T direction, the superconducting busbar is directly related to the installation of the superconducting busbar. The distance between the location of the mounting hole and the bottom surface of the groove will change, so take holes 1 and 21 as examples. By using CETOL analysis, the installation errors in hole 1 and hole 21 may reach 2.741 mm and 2.73 mm, which must be compensated by modifying the clamping device.
【學(xué)位授予單位】：安徽農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG801;TP391.7

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