【正文】 尺寸精度要求較高，但輪廓面精度要求不是很高，所以如圖可選用平口虎鉗，以底面和兩側(cè)面定位，零件先要加工上表面，因此以下平面為裝夾面，加工完所需要素后，翻轉(zhuǎn)夾持外輪廓，將夾持面銑掉。 工件的裝夾工件裝夾情況的好壞，不僅直接影響工件加工精度，還關(guān)系到產(chǎn)品質(zhì)量問(wèn)題，而且工件裝夾的快慢還直接影響到生產(chǎn)效率以及工件成本。5 零 件加工定位基準(zhǔn)的選擇正確選擇定位基準(zhǔn)對(duì)保證加工表面的尺寸精度和相互位置精度，確定各表面加工順序和夾具結(jié)構(gòu)的設(shè)計(jì)都有很大影響。根據(jù)減少定位、裝夾和多次換刀帶來(lái)的影響，結(jié)合我院實(shí)際情況采用加工中心（KVC650）進(jìn)行加工，便可達(dá)到零件的各項(xiàng)精度。 分析毛坯的裝夾 主要考慮毛坯在加工時(shí)定位和夾緊的可靠性與方便性，以便在一次安裝中完成所以的加工表面。3 毛 坯 的選擇所謂毛坯的加工余量，就是指使加工表面達(dá)到所需的精度和表面的質(zhì)量而應(yīng)切除的多余金屬層的厚度。該零件的加工輪廓由平面、外輪廓、型腔等構(gòu)成。 分析變形情況由于該零件菱形凹槽深 10mm，在加工過(guò)程中如果進(jìn)給速度過(guò)快容易變形，所以應(yīng)采用合理的加工方式。 零件圖紙上的尺寸標(biāo)注（1）按加工順序標(biāo)注尺寸，盡量減少尺寸換算，并能方便準(zhǔn)確地進(jìn)行測(cè)量。例如銑菱形凹槽時(shí)，應(yīng)該把粗精加工安排在一起，這樣就減少了換刀次數(shù)，在加工時(shí)，要保證零件的尺寸精度和表面粗糙度。要保證圓弧凸臺(tái)部分的尺寸 5mm 以及上表面的高度差 12mm。凹槽側(cè)面的粗糙度為、深度為 10mm 和深度為 5mm 處的平面粗糙度均為 。 （2） 零件中部菱形凹槽加工。圖 平面輪廓零件圖3 / 50 圖 示 零件的三維模型 加工內(nèi)容以及相關(guān)要求（1）上表面加工，保證零件的高度為 30mm，粗糙度一般為 。根據(jù)我院數(shù)控基地現(xiàn)有的的設(shè)備，故本次畢業(yè)設(shè)計(jì)的所有內(nèi)容都選擇在數(shù)控加工中心上加工。這將所學(xué)到的理論知識(shí)充分運(yùn)用到了實(shí)際加工中，切實(shí)做到了理論與實(shí)踐的有機(jī)結(jié)合。本課題來(lái)源于生產(chǎn)，是對(duì)所學(xué)知識(shí)的應(yīng)用，它包括了五年所學(xué)的全部知識(shí)，在數(shù)控專業(yè)上具有代表性，而且提高了綜合運(yùn)用各方面知識(shí)的能力。通過(guò)對(duì)各種定位夾緊裝置的分析比較，選擇并組合了一套既能夠滿足加工要求的，又比較簡(jiǎn)潔的裝置，并對(duì)各工步進(jìn)行數(shù)控編程。由于大量的加工操作需要裝夾，夾具設(shè)計(jì)在制造系統(tǒng)中就變得非常重要，它直接影響加工質(zhì)量，生產(chǎn)率和制造成本。須根據(jù)六點(diǎn)定位對(duì)產(chǎn)品進(jìn)行合理的定位，欠定位、完全定位還是過(guò)定位都須根據(jù)實(shí)際的生產(chǎn)過(guò)程決定。本課題對(duì)異性體、復(fù)雜的曲線、多工藝復(fù)合化加工進(jìn)行探索，設(shè)計(jì)出三種切實(shí)可行的工藝流程及工藝裝備。I / 50XX畢業(yè)設(shè)計(jì)題目：平面輪廓零件的數(shù)控加工及工藝分析系 部 專 業(yè) 名 稱 班 級(jí) 姓 名 學(xué) 號(hào) 指 導(dǎo) 教 師 II / 50摘 要高效率、高精度加工是數(shù)控機(jī)床加工最主要特點(diǎn)之一。利用數(shù)控機(jī)床加工，其產(chǎn)品加工的質(zhì)量一致性好，加工精度和效率均比普通機(jī)床高出很多，尤其在輪廓不規(guī)則、復(fù)雜的曲線或曲面、多工藝復(fù)合化加工和高精度要求的產(chǎn)品加工時(shí)，其優(yōu)點(diǎn)是傳統(tǒng)機(jī)床所無(wú)法比擬的。在產(chǎn)品的加工過(guò)程中，工件在夾具內(nèi)的定位和夾緊顯得特別重要。夾具是涵蓋了從加工到組裝的幾乎所有操作過(guò)程的一種裝夾設(shè)備。本文通過(guò)分析結(jié)構(gòu)特點(diǎn)和加工要求，制定了一套較合理的夾具設(shè)計(jì)，從而為保證該零件的加工精度將提供一種經(jīng)濟(jì)實(shí)用的工藝裝備，具有一定的實(shí)用價(jià)值。關(guān)鍵詞：數(shù)控加工，工藝流程，工藝裝備，夾具設(shè)計(jì)III / 50ABSTRACTThe high efficiency, the precision work are one of numerical control engine bed processing most main characteristics. Using the numerical control engine bed processing, its product processing quality uniformity is good, the processing precision and the efficiency outdo pared to the ordinary engine bed very much, especially when outline not rule, plex curve or curved surface, multicraft rebine processing and high accuracy request product processing, its merit is the traditional engine bed is unable to pare. This topic to the opposite sex body, the plex curve, the multicraft rebine processing carries on the exploration, designs three practical and feasible technical processes and the craft equipment. In the product processing process, the work piece appears in jig localization and the clamp specially importantly. Must act according to six localizations to carry on the reasonable localization to the product, owes the localization, locates pletely crosses the localization all to have to act according to the actual production process decision. The jig covered from has processed clamps the equipment to the assembly nearly all operating process one kind of attire. Because the massive processing operation needs to install clamps, the jig design changes can it be that the constant weight in the manufacture system to want, it affects the processing quality directly, the productivity and the production cost. This article through the analysis support ponents, the air pressor snifting valve lid as well as the supporting the unique feature and the processing request which wraps, has formulated a set of reasonable jig design, thus for guaranteed this ponents the processing precision will provide one economical practical craft equipment, will have certain practical value. Through to each kind of localization clamp analysis parison, chose and bines a set both to be able to satisfy the processing request, and the quite succinct installment, and carried on the numerical control programming to each step working procedure.Key word: numerical control processing, technical process, craft equipment, jig designIV / 50目 錄1 緒論 .....................................................................................................................................................................12 零件分析 ............................................................................................................................................................2 零件的結(jié)構(gòu)特點(diǎn) .....................................................................................................................................2 零件圖紙的工藝分析 ....................................................................................................................2 加工內(nèi)容以及相關(guān)要求 ...............................................................................................................3 加工要點(diǎn)分析 ..................................................................................................................................3 零件圖紙上的尺寸標(biāo)注 ...............................................................................................................3 分析變形情況 ..................................................................................................................................3 零件的精度要求 ..............................................................................................................................43 毛坯的選擇 .......................................................................................................................................................4 分析毛坯的加工余量 ............................................................................................................................4 零件毛坯形狀及余量的確定 .............................................................................................................44 機(jī)床的選擇 ........................................................................................................................................