freepeople性欧美熟妇, 色戒完整版无删减158分钟hd, 无码精品国产vα在线观看DVD, 丰满少妇伦精品无码专区在线观看,艾栗栗与纹身男宾馆3p50分钟,国产AV片在线观看,黑人与美女高潮,18岁女RAPPERDISSSUBS,国产手机在机看影片

正文內(nèi)容

汽車發(fā)動(dòng)機(jī)右支架加工工藝畢業(yè)設(shè)計(jì)(已修改)

2025-06-29 19:02 本頁(yè)面
 

【正文】 摘 要近年來(lái),我國(guó)的汽車發(fā)動(dòng)機(jī)水平有著顯著的提高,但是,大多數(shù)發(fā)動(dòng)機(jī)關(guān)鍵零部件技術(shù)還掌握在跨國(guó)公司手中,我們的發(fā)動(dòng)機(jī)技術(shù)水平與世界新進(jìn)水平相比還有不小的差距,同時(shí),國(guó)內(nèi)數(shù)控技術(shù)得到很大發(fā)展,尤其是汽車零部件的設(shè)計(jì)、制造與生產(chǎn)更是競(jìng)爭(zhēng)白熱化的階段。發(fā)動(dòng)機(jī)右支架是汽車發(fā)動(dòng)機(jī)上的主要零部件,制造精度要求高,零件形狀較為復(fù)雜。本設(shè)計(jì)針對(duì)汽車發(fā)動(dòng)機(jī)右支架加工工藝和鉆底孔專用夾具進(jìn)行了研究。在加工工藝方面,采用了工序集中與工序分散相結(jié)合的加工方法,使用加工中心等數(shù)控機(jī)床對(duì)部分工序采取集中加工。在實(shí)際生產(chǎn)中,這套工藝可以保證機(jī)器零件的加工質(zhì)量,提高生產(chǎn)率;降低制造成本;減輕工人的勞動(dòng)強(qiáng)度,保證生產(chǎn)安全。在零件加工過(guò)程中,幾乎每道工序都采用專用夾具與特殊加工工藝相結(jié)合,保證零件在加工和裝配過(guò)程中尺寸的高精度要求,減少零件在加工中的變形、保障整體部件裝配尺寸精良、配合準(zhǔn)確。在加工中心孔系加工工序的專用夾具設(shè)計(jì)過(guò)程中,考慮到零件形狀較為復(fù)雜,可選擇的定位面較少,現(xiàn)以右支架底面作為精基準(zhǔn),用兩個(gè)定位銷和三個(gè)支承板對(duì)其進(jìn)行六點(diǎn)完全定位,采用液壓夾緊方式并用兩個(gè)帶螺旋槽的鉤頭壓板夾緊工件。結(jié)果表明,此加工工藝能使工件加工精度符合各項(xiàng)尺寸要求,并且提高了生產(chǎn)率。專用夾具的使用保證了工件定位的準(zhǔn)確和穩(wěn)定,提高了工作效率。關(guān)鍵詞: 汽車發(fā)動(dòng)機(jī)右支架;工藝;夾具AbstractIn recent years, with the external technical beening massively introduced, the domestic automobile profession has been rapidly obtained right support is the main parts on the “engine”——the automobile heart. The manufacture precision and the plex ponent requests shape bring a lot of inconvenient during the process.This design researches systematically on the engine right support processing craft and the jig.In the processing craft aspect the processing method that the working procedure centralism and the dispersed phase are bined is used, and the numerical control engine beds is used to process centrally the partial working procedures, then, not only the processing quality is guaranteed, but also the production efficiency is greatly enhanced .At the same time, the former hole surface processing is innovated in the processing working procedure successively the order which causes the localization to be more accurate, thus also enable the ponents the processing precision to obtain a better the jig design aspect, in each working procedure the unit clamp is used to carry on the clamp nearly to the work piece, and in partial working procedures, the elastic localization is used to overe the work piece distortion during clamps produces and the the prefolk prescription law is used to solve the middle axle distortion during bracket processing.While the special clamp is design, the plex ponent shape and the few choice location are taken into account, the right support bottom surface is taken as the fine datum, and two positioning pins and four supporting tablet couplet are used to locate pletely, the hydraulic pressure clamp method is selected and two belt spiral groove hooks are used to clamp work piece, which not only ensure the processing precision and the production efficiency, but also enhanced the production security and the working conditions.The findings indicate that process precision of the motor engine right support are fit for each size requirement and this technology enhances the productivity, which advanced the create a secure production special clamping make sure that the work piece is located correctly ,and the working strength is reduced in the mobile clamping way,at the same time the work efficiency is improved.Keywords:Right support of automobile engine ;Technology ;Jig 引 言發(fā)動(dòng)機(jī)是汽車的心臟.汽車的發(fā)展與發(fā)動(dòng)機(jī)的進(jìn)步有著直接的聯(lián)系.18世紀(jì)中葉,瓦特發(fā)明了蒸氣機(jī),(),是世界上第一輛蒸汽機(jī)車.1858年,定居在法國(guó)巴黎的里諾發(fā)明了煤氣發(fā)動(dòng)機(jī)[煤氣發(fā)動(dòng)機(jī)如下 圖2],使用電池和感應(yīng)線圈產(chǎn)生電火花,活塞,連桿,因?yàn)槊簹獍l(fā)動(dòng)機(jī)的壓縮比為零.1867年,德國(guó)人奧托(Nicolaus August Otto)受里諾研制煤氣發(fā)動(dòng)機(jī)的啟發(fā),對(duì)煤氣發(fā)動(dòng)機(jī)進(jìn)行了大量的研究,制作了一臺(tái)臥式氣壓煤氣發(fā)動(dòng)機(jī),后經(jīng)過(guò)改進(jìn),奧托提出了內(nèi)燃機(jī)的四沖程理論,本茨根據(jù)奧托發(fā)動(dòng)機(jī)的原理,各自研制出具有現(xiàn)代意義的汽油發(fā)動(dòng)機(jī),為汽車的發(fā)展鋪平了道路.1892年,德國(guó)工程師狄塞爾根據(jù)定壓熱功循環(huán)原理,研制出壓燃式柴油機(jī),并取得了制造這種發(fā)動(dòng)機(jī)的專利權(quán).1957年,德國(guó)人汪克爾發(fā)明了轉(zhuǎn)子活塞發(fā)動(dòng)機(jī),無(wú)曲軸連桿和配氣機(jī)構(gòu),%,質(zhì)量輕,體積小,轉(zhuǎn)速高,轉(zhuǎn)速為5500轉(zhuǎn)/,(馬自達(dá)公司)買下了轉(zhuǎn)子發(fā)動(dòng)機(jī)的樣機(jī),并把轉(zhuǎn)子發(fā)動(dòng)機(jī)裝在汽車上,可以說(shuō),轉(zhuǎn)子發(fā)動(dòng)機(jī)生在德國(guó),長(zhǎng)在日本.汽車的外貌——車身造型在早期的汽車設(shè)計(jì)和制造當(dāng)中,人們把主要精力都花費(fèi)在汽車的機(jī)械工程學(xué)方面,到了20世紀(jì)20年代后汽車設(shè)計(jì)者們開始著手從汽車的外部造型上進(jìn)行改進(jìn)并相繼引進(jìn)了空氣動(dòng)力學(xué),流體力學(xué),人體工程學(xué)以及工業(yè)造型設(shè)計(jì)(工業(yè)美學(xué)),主要經(jīng)歷了以下幾個(gè)階段:馬車型汽車,箱型汽車,甲殼蟲型汽車,船型汽車,魚型汽車,楔型汽車。其中甲殼蟲型轎車可以說(shuō)是一個(gè)劃時(shí)代的產(chǎn)品.從30年代到40年代末的20年間,可以說(shuō)是流線型汽車的黃金時(shí)代,并超過(guò)了數(shù)百萬(wàn)輛.在汽車史上有一個(gè)特別的例子,一種汽車式樣的存在和它的生產(chǎn)設(shè)備都取
點(diǎn)擊復(fù)制文檔內(nèi)容
法律信息相關(guān)推薦
文庫(kù)吧 www.dybbs8.com
公安備案圖鄂ICP備17016276號(hào)-1