【正文】 摘 要 CA6140 車(chē)床撥叉它位于車(chē)床變速機(jī)構(gòu)中主要起換檔作用，和其他零件配合，在改變轉(zhuǎn)速的時(shí)候承受輕微的載荷，所以加工時(shí)應(yīng)該保證本零件的重要工作表面符合技術(shù)要求。 本次所設(shè)計(jì)的 鉆床 夾具是用于加工 M22 螺紋孔， 確定了“兩孔一面”的定位方案和相應(yīng)的定位機(jī)構(gòu)及夾緊機(jī)構(gòu)、對(duì)刀裝置，并進(jìn)行了定位誤差分析和夾緊力的計(jì)算。在設(shè)計(jì)中定位裝置心軸限制 4 個(gè)自由度、側(cè)板限制 1 個(gè)和 浮動(dòng)支承板限制 1 個(gè)；螺母和心軸配合用來(lái)夾緊零件；用鉆套引導(dǎo)刀具進(jìn)行加工；夾具體用于連接夾具各元件及裝置，并與機(jī)床有關(guān)部位連接，以確定夾具相對(duì)于機(jī)床的位置。s form, select the appropriate benchmark crude and refined, determine the surface of processing methods and routes, choice of machine tools and cutting tools, fixtures, tools, and other technical equipment, and allowance, dimensions and tolerances, cutting, time quotas, the calculation and determination. This drill with fixtures designed is used for processing M22, threaded hole, identified the two holes in the side of positioning schemes and appropriate positioning and clamping, knives, and positioning error analysis and calculation of the clamping force. It mainly includes: positioning device, clamps, boot device, specific, and so on。 nut and the pin used to clamp the part。 clip specific ponents used to connect to the fixture and equipment, and machine tool for parts of the connection, to determine the location of the fixture relative machine. Key words: fork。 location Datum。 fixture design 目 錄 III 目 錄 摘 要 ......................................................................................................................................... I Abstract....................................................................................................................................... II 目 錄 .......................................................................................................................................III 第一章 緒論 ............................................................................................................................ 1 課題背景 .................................................................................................................... 1 夾具的發(fā)展史 ............................................................................................................ 1 小結(jié) ............................................................................................................................ 2 第二章 零件的分析 ................................................................................................................ 3 零件的工藝分析 ........................................................................................................ 3 零件的技術(shù)要求 ........................................................................................................ 4 零件的工藝性 ............................................................................................................ 4 確定撥叉的生產(chǎn)類(lèi)型 ................................................................................................ 5 第三章 毛坯的設(shè)計(jì) ................................................................................................................ 6 確定毛坯的制造形式 ................................................................................................ 6 確定毛坯的尺寸公差和機(jī)械加工余量 .................................................................... 6 毛坯圖 ........................................................................................................................ 7 第四章 擬定零件工藝路線 .................................................................................................. 8 定位基面的選擇 ........................................................................................................ 8 粗基準(zhǔn)的選擇 .................................................................................................... 8 精基準(zhǔn)的選擇 .................................................................................................... 8 表面加工方法的確定 ................................................................................................ 9 加工階段的劃分 ........................................................................................................ 9 工序的集中與分散 .................................................................................................... 9 工序順序的安排 ...................................................................................................... 10 機(jī)械加工工序的安排 ...................................................................................... 10 輔助工序 .......................................................................................................... 10 工藝路線的確定 ...................................................................................................... 10 工藝路線方案一 .............................................................................................. 10 工藝路線方案二 .............................................................................................. 11 工藝方案的比較與分析 .................................................................................. 11 機(jī)床及工藝裝備的選擇 .......................................................................................... 12 選擇機(jī)床 .......................................................................................................... 12 選擇夾具 .......................................................................................................... 13 選擇刀具 .......................................................................................................... 14 選擇量具 .......................................................................................................... 14 第五章 機(jī)械加工余量、工序尺寸及公差的確定 .............................................................. 16 外圓表面 （ Φ42） ……………………………………………………………… ...16 Φ25孔上下端面 ...................................................................................................... 16 撥叉叉軸孔（ Φ25） ...................................................................................