【正文】 題 目 F125曲軸左部零件的機(jī)加工藝及銑夾具設(shè)計(jì) 英文并列題目 F125 crankshaft left parts machining and milling fixture design 摘 要軸類零件是機(jī)器中經(jīng)常遇到的典型零件之一。它主要用來支承傳動(dòng)零部件，傳遞扭矩和承受載荷。軸類零件是旋轉(zhuǎn)體零件，其長度大于直徑，一般由同心軸的外圓柱面、圓錐面、內(nèi)孔和螺紋及相應(yīng)的端面所組成。根據(jù)結(jié)構(gòu)形狀的不同，軸類零件可分為光軸、階梯軸、空心軸和曲軸等。軸的長徑比小于5mm的稱為短軸，大于20mm的稱為細(xì)長軸，大多數(shù)軸介于兩者之間。軸用軸承支承，與軸承配合的軸段稱為軸頸。軸頸是軸的裝配基準(zhǔn)，它們的精度和表面質(zhì)量一般要求較高，其技術(shù)要求一般根據(jù)軸的主要功用和工作條件制定，通常有以下幾項(xiàng)：軸類零件中工藝規(guī)程的制訂，直接關(guān)系到工件質(zhì)量、勞動(dòng)生產(chǎn)率和經(jīng)濟(jì)效益。一零件可以有幾種不同的加工方法，但只有某一種較合理，在制訂機(jī)械加工工藝規(guī)程中，須注意以下幾點(diǎn)。，需理解零件結(jié)構(gòu)特點(diǎn)、精度、材質(zhì)、熱處理等技術(shù)要求，且要研究產(chǎn)品裝配圖，部件裝配圖及驗(yàn)收標(biāo)準(zhǔn)。：有非加工表面，應(yīng)選非加工表面作為粗基準(zhǔn)。對(duì)所有表面都需加工的鑄件軸，根據(jù)加工余量最小表面找正。且選擇平整光滑表面，讓開澆口處。選牢固可靠表面為粗基準(zhǔn)，同時(shí)，粗基準(zhǔn)不可重復(fù)使用。：要符合基準(zhǔn)重合原則，盡可能選設(shè)計(jì)基準(zhǔn)或裝配基準(zhǔn)作為定位基準(zhǔn)。符合基準(zhǔn)統(tǒng)一原則。盡可能在多數(shù)工序中用同一個(gè)定位基準(zhǔn)。盡可能使定位基準(zhǔn)與測(cè)量基準(zhǔn)重合。選擇精度高、安裝穩(wěn)定可靠表面為精基準(zhǔn)。關(guān)鍵詞：？？軸類零件、機(jī)械加工工藝分析、銑工夾具30 / 36ABSTRACTThe axis class ponents are one which of typical ponents in the machine meets frequently. It mainly uses for the supporting transmission spare part, the transmission torque and the absorbing load. The axis class ponents are the solid of revolution ponents, its length is bigger than the diameter, generally by with spindle39。s outer annulus cylinder, the circular conical surface, in the hole and the thread and the corresponding end surface is posed. According to the structure shape39。s difference, the axis class ponents may divide into the optical axis, the steps and ladders axis, the canon and the crank and so on. the axis39。s length to diameter ratio is smaller than 5mm is called the minor axis, is bigger than 20mm is called the thin major axis, mostly the number axis is situated between both. the axis with the bearing supporting, is called the journal with the bearing coordination39。s axis section. The journal is the axis assembly datum, their precision and the surface quality general request are high, its specification acts according to the axis generally the main function and the working condition formulation, usually has the following several items: (1) Size precision Plays the supporting role the journal for the true dead axle39。s position, usually is high to its size accuracy requirement (IT5~IT7). The assembly passes on the moving parts the journal size precision general request to be low (IT6~IT9). (2) Geometrical shape precision The axis class ponents39。 geometrical shape precision is mainly refers to the journal, the male cone, the Morse awl hole and so on roundness, the cylindricity and so on, generally should limit its mon difference in the size tolerance interval. To the accuracy requirement high in outer annulus surface, should label its allowable deviation on the blueprint. (3) Mutual position precision The axis class ponents39。 position accuracy requirement is mainly decides by the axis in machinery position and the function. Usually should guarantee that the assembly passes on the moving parts the journal to supporting journal39。s proper alignment request, will otherwise affect will pass on the moving parts (gear and so on) the transmission precision, and will have the noise. General precision39。s axis, its coordinate axis section to supporting journal39。s radial direction beat is generally ~, the high accuracy axis (for example main axle) usually is ~.(4) Surface roughness Generally with passes on the axle diameter surface roughness which the moving parts coordinate for ~, coordinates the supporting axle diameter39。s surface roughness with the bearing for ~. In axis class ponents technological process making, direct relation work piece quality, labor productivity and economic efficiency. Components may have several different processing methods, but only then one kind reasonable, in the making machinefinishing technological process, must pay attention to the following several spots. 1. Detail drawing process study, must understand ponents specifications and so on unique feature, precision, material quality, heat treatment, and must study the product assembly drawing, part assembly drawing and inspection standard