【正文】 指導(dǎo)老師 XXXXXXXXXXXXXX 2022 年 4 月 22 日9機械制造工藝學(xué)課程設(shè)計任務(wù)書題目：設(shè)計“撥叉 831007”零件的機械加工工藝規(guī)程及工藝裝備（年產(chǎn)量 5000 件）內(nèi)容： 1 張 1 張 1 張 1 張 1 份10目錄序言 ....................................................................................................................................................2零 件 的 分 析 ..........................................................................................................................3 零件的作用 ............................................................................................................................3 零件的工藝分析 ....................................................................................................................3 位置要求： ............................................................................................................................3工 藝 規(guī) 程 設(shè) 計 ....................................................................................................................3 確定毛坯的制造形式 .............................................................................................................3 基面的選擇 ............................................................................................................................4 粗基準的選擇： ............................................................................................................4 精基準的選擇： ............................................................................................................4 制定工藝路線 ........................................................................................................................4 工藝路線方案一： ........................................................................................................4 工藝路線方案二 ............................................................................................................5 工藝方案的比較與分析 ................................................................................................5 機械加工余量、工序尺寸及公差的確定: ..........................................................................6 確定切削用量及基本工時 ........................................................................................................7工序Ⅰ 以毛坯底邊為基準，鉆 Ф20MM 孔, 擴孔至 .................................................7 ................................................................................................................................7 ........................................................................................................................8工序Ⅱ 以底端面為基準，銑 Ф40MM 上端面，保證其尺寸要求及粗糙度 ...........................8 ................................................................................................................................8 ........................................................................................................................9工序Ⅲ 以 Ф40 為精基準，鏜 Ф55+ 0MM，鏜 Ф73+ 0MM 保證其尺寸和粗糙度 ...9 ................................................................................................................................9 ......................................................................................................................103. 計算基本工時 ....................................................................................................................10工序Ⅳ 粗鏜、半精鏜、精鏜 Ф55MM 孔至圖樣尺寸 .............................................................10 ..............................................................................................................................11 ......................................................................................................................11工序Ⅳ 以孔 Φ40 為精基準，鉆孔至 Φ