本文選題：精度設(shè)計(jì)　切入點(diǎn)：公差建模　出處：《安徽農(nóng)業(yè)大學(xué)》2013年碩士論文

【摘要】：饋線系統(tǒng)主要完成向ITER（International Thermonuclear Experimental Reactor）中主要磁體系統(tǒng)進(jìn)行供電、冷卻、測量控制診斷等任務(wù)，由線圈終端盒、內(nèi)部饋線和過渡饋線等部件組成。本文結(jié)合饋線系統(tǒng)線圈終端盒的檢測要求，利用CATIA下的公差分析軟件CETOL6σ對終端盒結(jié)構(gòu)進(jìn)行了精度設(shè)計(jì)和分析，用極值法和統(tǒng)計(jì)法對尺寸鏈進(jìn)行了計(jì)算，對分析結(jié)果進(jìn)行了優(yōu)化，使結(jié)構(gòu)中各個(gè)被檢測部件的位置度能夠達(dá)到檢測要求。 本論文的研究內(nèi)容主要分為四個(gè)部分： 一是建立了饋線系統(tǒng)終端盒三維實(shí)體模型。在三維建模軟件CATIA平臺下建立了終端盒三維實(shí)體模型，得到了初步研究對象，根據(jù)實(shí)際裝配情況完成模型的裝配和簡化，移除了與分析尺寸不相關(guān)的零部件，合并了對分析結(jié)果不產(chǎn)生影響的組件。對簡化后的模型進(jìn)行了重新裝配。 二是建立了饋線系統(tǒng)終端盒公差模型。在簡化的三維實(shí)體模型基礎(chǔ)上建立公差模型。利用模型中的特征，確定了模型的基準(zhǔn)，，設(shè)計(jì)尺寸公差、幾何公差等精度要求，完成了以終端盒箱體精度要求為目標(biāo)進(jìn)行的精度分析。 三是建立了饋線系統(tǒng)終端盒內(nèi)部結(jié)構(gòu)公差模型。在CETOL6σ平臺下確定了終端盒內(nèi)部結(jié)構(gòu)裝配基準(zhǔn)，根據(jù)基準(zhǔn)按照裝配順序設(shè)定了零部件自由度，建立了無過約束和欠約束的裝配公差模型。定義了零部件特征和尺寸精度要求。通過分析結(jié)果中夾持管道的板面安裝精度，利用極值法計(jì)算出了冷卻管道位置最大變化范圍在6.5mm內(nèi)，超導(dǎo)母線位置變化范圍超出了2.5mm。 四是根據(jù)分析結(jié)果進(jìn)行優(yōu)化設(shè)計(jì)。在獲得的各個(gè)分析對象結(jié)果基礎(chǔ)上，根據(jù)對裝配質(zhì)量產(chǎn)生影響的組成環(huán)的敏感度和貢獻(xiàn)度數(shù)據(jù)查找出關(guān)鍵尺寸，便于在生產(chǎn)中保證這些尺寸和精度要求。以滿足檢測要求和降低產(chǎn)品制造成本為前提，對尺寸鏈中零部件精度進(jìn)行了優(yōu)化設(shè)計(jì)至合理。
[Abstract]:The feeder system mainly completes the tasks of supplying power, cooling, measuring, controlling and diagnosing to the main magnet system in ITER(International Thermonuclear Experimental Reactor. According to the detection requirements of the coil terminal box of the feeder system, the tolerance analysis software CETOL6 蟽 under CATIA is used to design and analyze the precision of the terminal box structure. The dimension chain is calculated by extreme value method and statistical method, and the analysis results are optimized, so that the position degree of each detected part in the structure can meet the detection requirements. The research content of this thesis is divided into four parts:. First, the 3D entity model of the terminal box of the feeder system is established. The 3D entity model of the terminal box is established on the platform of CATIA, and the preliminary research object is obtained. The assembly and simplification of the model are completed according to the actual assembly conditions. The components which are not related to the size of the analysis are removed and the components which have no effect on the analysis results are combined. The simplified model is reassembled. Secondly, the tolerance model of the terminal box of the feeder system is established. The tolerance model is established on the basis of the simplified three-dimensional solid model. By using the characteristics of the model, the accuracy requirements of the model, such as the standard of the model, the design dimension tolerance and the geometric tolerance, are determined. The precision analysis of the terminal box is completed. Thirdly, the tolerance model of the inner structure of the terminal box of the feeder system is established. The assembly datum of the inner structure of the terminal box is determined under the CETOL6 蟽 platform, and the degree of freedom of the parts is set according to the assembly order of the datum. An assembly tolerance model without over-constraint and under-constraint is established. The characteristics and dimensional accuracy requirements of the parts are defined. The plate mounting accuracy of the clamped pipe is analyzed. By using the extreme value method, the maximum variation range of the cooling pipe position is calculated in 6.5mm, and the superconducting bus position range exceeds 2.5 mm. The fourth is to optimize the design according to the analysis results. On the basis of the results of each analysis object, the key dimensions are found according to the sensitivity and contribution data of the constituent ring which has an impact on assembly quality. In order to meet the inspection requirements and reduce the manufacturing cost, the precision of the parts in the dimension chain is optimized to be reasonable.
【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】：2013
【分類號】：TH164;TH122

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