【正文】 變速齒輪撥叉加工工藝的制定及銷孔鉆床夾具設(shè)計 I 摘 要 本課題是 “ 拖拉機(jī)變速箱內(nèi)用于Ⅱ Ⅲ擋變速齒輪撥叉零件 ” 的機(jī)械加工工藝規(guī)程的編制。撥叉零件在變速箱內(nèi)是個必不可少的部件， 設(shè)計時用到了銷孔轉(zhuǎn)床的設(shè)計和撥叉夾具體的設(shè)計，其定位零件是以變φ 25H7 孔套在軸上，并用銷釘經(jīng)φ 6H12 孔與軸定位，撥叉腳卡在雙聯(lián)齒輪的槽中， 變速操縱機(jī)構(gòu)通過撥叉頭部的操縱槽帶動撥叉與軸一起在變速箱中滑動，撥叉腳撥動雙聯(lián)齒輪在花鍵軸上滑移，就可實現(xiàn)變速箱的變速功能，從而實現(xiàn)拖拉機(jī)的變速。所以在加工時，零件的配合部分需進(jìn)行精加工，保證其配合準(zhǔn)確。由于被加工零件在工作時要承受一定的 力，因此要求有一定的強(qiáng)度、剛度和韌性。 關(guān)鍵詞 齒輪撥叉，銷孔鉆床，變速箱，夾具體（關(guān)鍵詞 35個） 沈陽工程學(xué)院畢業(yè)設(shè)計（論文） II Abstract This topic is “the tractor gear boxes uses inⅡ Ⅲ Keeps off thechange speed gear dials the fork ponents” machinefinishing technological process establishment. Dials the fork ponents in the gear box is an essential part, the speed change control mechanism through dials the fork forehead the operation troughed belt to move dials the fork and the axis skids together in the gear box, dials the fork foot to move the twin gear to slip on the spline shaft, may realize gear box39。s speed change function, thus realizes tractor39。s speed change. Therefore in processing time, the ponents coordinate part must carry on the precision work, guaranteed that its coordination is accurate. Because is processed the ponents in the work time must withstand certain strength, therefore the request has certain intensity, the rigidity and toughness. key word , the gear dials the fork, the ponents, the gear box。 Key Words electric power system, speed change box,the fork. 變速齒輪撥叉加工工藝的制定及銷孔鉆床夾具設(shè)計 目 錄 摘 要 .................................................................................................................................. I Abstract ............................................................................................................................... II 言 ............................................................................................................................. 1 零件的工藝分析 ................................................................................................... 2 零件的功用、結(jié)構(gòu)及特點 .......................................................................... 2 加工表面及其主要要求 .............................................................................. 2 毛坯的選擇 ......................................................................................................... 2 確定毛坯的類型、制造方法和尺寸及其公差 .......................................... 2 確定毛坯的技術(shù)要求 .................................................................................. 3 繪制毛坯圖 .................................................................................................. 3 基準(zhǔn)的選擇 ............................................................................................................ 4 擬訂機(jī)械加工工藝路線 ....................................................................................... 4 確定各表面的加工方 法 .............................................................................. 4 擬定加工工藝路線 ...................................................................................... 5 工藝路線方案的分析與比較 ...................................................................... 6 確定機(jī)械加工余量、工序尺寸及公差 ............................................................... 6 選擇機(jī)床及工藝設(shè)備 ........................................................................................... 7 選擇機(jī)床 ...................................................................................................... 7 選擇刀具 ...................................................................................................... 7 選擇夾具 ...................................................................................................... 8 選擇量具 ...................................................................................................... 8 確定切削用量及基本工時 ................................................................................... 9 工序 10........................................................................................................ 9 工序 60.......................................................................................................11 2 鉆床夾具設(shè)計 ............................................................................................................... 12 零件的工藝分析 ................................................................................................. 12 定位方案及元件的選擇 ..................................................................................... 12 定位方案的選擇 ....................................................................................... 12 定位元件的選擇 ........................................................................................ 13 定位誤差的計算 ........................................................................................ 13 導(dǎo)向方案及導(dǎo)向元件的選擇和設(shè)計 .................................................................. 13 導(dǎo)向方案選擇 ............................................................................................ 13 導(dǎo)向元件設(shè)計 ............................................................................................ 13 導(dǎo)向誤差計算 ............................................................................................ 14 夾具裝置的設(shè)置 .................................................................................................. 14 設(shè)置夾具體、繪制夾具草圖 .............................................................................. 14 繪制夾具裝配圖 .................................................................................................. 14 繪制夾具零件圖 .................................................................................................. 14 結(jié) 論 ............................................................................................................................... 15 參考文獻(xiàn) ........................................................................................................................... 17 沈陽工程學(xué)院畢業(yè)設(shè)計（論文） 2 附 錄 ..................................................................