【正文】
加工表面的精度要求??蓪⒓庸るA段分為粗加工,半精加工與精加工三個(gè)階段。 粗基準(zhǔn):需要平整,無飛邊,毛刺或其他表面欠缺的加工面,本加工方案選擇偏心套外圓柱面與右端面為粗基準(zhǔn)。因?yàn)槿缧枰獙S脢A具的側(cè)槽和上平面,下平面以及孔加工都要以它們?yōu)榛鶞?zhǔn)。 表(2)項(xiàng)目(mm)機(jī)械加工余量(mm)尺寸公差(mm)長(zhǎng)度182端面R29繪制毛坯零件圖。綜合以上,可查表確定該零件毛坯的尺寸公差與加工余量。外圓:粗車外圓,直徑為52mm,零件長(zhǎng)度180mm。對(duì)零件圖進(jìn)行分析計(jì)算,可以大致確定鍛件外廓包容體的尺寸。2 機(jī)械加工工藝規(guī)程設(shè)計(jì),繪制毛坯簡(jiǎn)圖 選擇毛坯該零件因其一般只用于輕載,沖擊小或無沖擊的場(chǎng)合。30mm內(nèi)孔較長(zhǎng),需以多步驟加工實(shí)現(xiàn)。30mm內(nèi)孔對(duì)精度要求較高,由于端面為平面,可防止鉆頭鉆偏以保證加工精度。分析零件圖可知,該偏心套的左,右端面精度要求并不太高,可用銑削加工。 技術(shù)要求: 將該零件的技術(shù)要求列入表(1)中 表(1)加工表面 尺寸及偏差(mm)公差及精度等級(jí)表面粗糙度Ra(m)形位公差(mm)左,右端面 IT13 圓柱面 IT1330mm內(nèi)孔IT7上平面IT13下平面IT13上平面方形孔IT12下平面方形孔IT12左端面?zhèn)炔跧T12方形側(cè)孔IT12E面孔H11 3mm圓孔IT13 M36H螺紋孔M3—6H 加工熱處理方面,要求調(diào)質(zhì)處理硬度230250HB。查閱資料表明,該工件一般承受較小的負(fù)載。我可以將壓縮包送給你。關(guān)鍵詞:偏心套 零件 加工過程ABSTRACTNowadays,the petition of world countries has shift to the petition of new science and technology pletely,In this age , level of development for the machine industry has bee the most important criteria in the judgement in a country’s level of Nuclear industry to dead stock,ALL the establishment and facilities,hat our country need and consume, depend on our machine industry .The histroy of mankind is the histroy of the machine buildingConsider chinese industry construction,Many argumentations has been bring forward in the globality enjoy our achievement in some new in these serious earthquake in WENCHUAN,we discovered our weakness: dimensions, asperous technics,core technology depend on other notwithstanding these is the age of advanced krowlage,we must improve our wellrounded technologies.These instruction book is for machine hardware eccentric bushing’s processing cycle . The eccentric bushing with their proprietary position acmodate inside diameter ,use the screw to realize the acmodate of inner ring’s bacause their clearance fit position, they apply to non or light are a type of frequentlyused machine hardware.Key word : eccentric bushing , machine hardware, processing cycle謝謝朋友對(duì)我文章的賞識(shí),充值后就可以下載說明書,我這里還有一個(gè)壓縮包,里面有相應(yīng)的word說明書和CAD圖紙(毛坯圖、零件圖、夾具零件圖、夾具裝配圖)及工序卡片。但因?yàn)閮?nèi)圈內(nèi)孔是間隙配合,一般只用于輕載、無沖擊的場(chǎng)合。本說明書是為加工機(jī)械零件偏心套的加工過程而編寫。包括規(guī)模較小,工藝粗糙,關(guān)鍵技術(shù)仍依賴國(guó)外等等??梢哉f人類文明史就是機(jī)械制造的歷史。遼寧工程技術(shù)大學(xué)課 程 設(shè) 計(jì)題 目:偏心套的機(jī)械加工工藝規(guī)程及工藝裝備設(shè)計(jì) 班 級(jí): 姓 名: 指導(dǎo)教師: 完成日期: