【正文】 ............................................... 14 加工余量及工序尺寸的確定 .............................................................. 14 機(jī)床和工藝裝備的選擇 ...................................................................... 17 IV 確定切削用量及 基本工時(shí) .................................................................. 18 時(shí)間定額計(jì)算及生產(chǎn)安排 ......................................................................... 32 粗、精銑底面 ....................................................................................... 32 鏜側(cè)面三杠孔 ....................................................................................... 32 鉆頂面四孔 ........................................................................................... 33 第 3 章 專用夾具設(shè)計(jì) .......................................................................................... 35 銑平面夾具設(shè)計(jì) ......................................................................................... 35 研究原始資料 ....................................................................................... 35 定位基準(zhǔn)的選擇 ................................................................................... 35 切削力及夾緊分析計(jì)算 ...................................................................... 35 誤差分析與計(jì)算 ................................................................................... 37 夾具設(shè)計(jì)及操作的簡(jiǎn)要說明 ................................................................ 37 鏜孔夾具設(shè)計(jì) ............................................................................................. 38 研究原始資料 ....................................................................................... 38 定位基準(zhǔn)的選擇 ................................................................................... 38 切削力及夾緊力的計(jì)算 ...................................................................... 38 誤差分析與計(jì)算 ................................................................................... 40 結(jié) 論 ...................................................................................................................... 41 致 謝 ...................................................................................................................... 42 參考文獻(xiàn) .................................................................................................................. 43 V CONTENTS Abstract ..................................................................................................................... II Chapter 1 Introduction............................................................................................ 1 Machining process planning ......................................................................... 1 The principle of technicolgical regulations formulation ............................. 1 The original data when formulation technicolgical regulations ................. 2 The steps of technicolgical regulations formulation ................................... 2 Process file format......................................................................................... 3 Machining technology process card....................................................... 3 Machining process card .......................................................................... 3 Machining procedure card ...................................................................... 3 Basic requests of tongs design ...................................................................... 5 Chaper 2 CA6140 machining process planning of machine bracket ............. 5 Process analysis and the choice of rough of CA6140 machine after the bracket ........................................................................................................... 5 Structure of the process for CA6140 machine bracket ......................... 5 Technical requirements for CA6140 machine bracket ......................... 5 Choice of rough for CA6140 machine bracket ..................................... 6 Machining process design ............................................................................. 6 The position of the process ............................................................. 6 The choice of locating datum ................................................................. 7 Division of processing stages ................................................................. 8 Definition of processing program .......................................................... 9 Centralization and decentralization for process .................................. 11 The camparation of processing line program ...................................... 11 The process design of the processing ......................................................... 13 Process requirements of rough structure ............................................. 13 Definition of allowances and the process sizes ................................... 14 The choice of machine tools and process equipment.......................... 17 VI Determining the cutting parameters and basic working hours ........... 18 Time fixed terms and production arrangements ........................................ 31 Underside of roughing and finishing ................................................... 32 Three holes in the boring side .............................................................. 32 Four holes of drill the top surface ........................................................ 33 Chapter 3 three dedicated fixture design............................................................ 35 Milling fixture design.................................................................................. 35 The study of the original material ........................................................ 35 Options of positioning benchmark ....................................................... 35 The cutting