【正文】 工序安排是先以支承孔系定位加工出頂平面，再以端面平面與支承孔系定位加工出工藝孔。并將孔與平面的加工明確劃分成粗加工和精加工階段以保證孔系加工精度。一般來說，保證平面的加工精度要比保證孔系的加工精度容易。 1 四川大學(xué)錦城學(xué)院 本科生畢業(yè)設(shè)計 題 目 支架加工工藝及夾具設(shè)計 系 別 專 業(yè) 學(xué)生姓名 學(xué) 號 年級 指導(dǎo)教師 二Ο一五 年 月 日 2 支架加工工藝及夾具設(shè)計 專業(yè)：機(jī)械設(shè)計制造及其自動化 學(xué) 生： 指導(dǎo)老師： 摘 要 本設(shè)計是基于支架零件的加工工藝規(guī)程及一些工序的專用夾具設(shè)計。支架零件的主要加工表面是平面及孔系。因此，本設(shè)計遵循先面后孔的原則?；鶞?zhǔn)選擇以支架的支承孔作為粗基準(zhǔn) ，以端面與兩個工藝孔作為精基準(zhǔn)。在后續(xù)工序中除個別工序外均用頂平面和工藝孔定位加工其他孔系與平面。整個加工過程均選用組合機(jī)床。 關(guān)鍵詞： 支架類零件；工藝；夾具； 3 Process and Fixture Design of Bracket Major: mechanical design manufacturing and automation Student: Tang Guojin The instructor: Huang Weiju Abstract The design is based on the body parts of the processing order of the processes and some special fixture design. Body parts of the main plane of the surface and pore system. In general, the plane guarantee processing precision than that of holes machining precision easy. Therefore, this design follows the surface after the first hole principle. Plane with holes and the processing clearly divided into roughing and finishing stages of holes to ensure machining accuracy. Datum selection box input shaft and the output shaft of the supporting hole as a rough benchmark, with top with two holes as a precision technology reference. Main processes arrangements to support holes for positioning and processing the top plane, and then the top plane and the supporting hole location hole processing technology. In addition to the followup processes individual processes are made of the top plane and technological hole location hole and plane processing. Supported hole processing using the method of coordinate boring. The whole process of processing machine binations were selected. Selection of special fixture fixture, clamping means more choice of pneumatic clamping, clamping reliable, institutions can not be locked, so the production efficiency is high, suitable for large batch, line processing, can meet the design requirements. Key words: box type parts process。 4 目 錄 第 1 章 緒論 .................................................................................................................... 5 機(jī)械加工工藝概述 .............................................................................................. 5 機(jī)械加工工藝流程 ............................................................................................... 5 夾具概述 ............................................................................................................. 6 機(jī)床夾具的功能 ................................................................................................... 6 機(jī)床夾具的發(fā)展趨勢 ............................................................................................ 6 機(jī)床夾具的現(xiàn)狀 ......................................................................................... 6 現(xiàn)代機(jī)床夾具的發(fā)展方向 ........................................................................... 7 第 2 章 零件的分析 .......................................................................................................... 9 零件的作用 ......................................................................................................... 9 零件的工藝分析 .................................................................................................. 9 孔和平面的加工順序 ............................................................................... 10 孔系加工方案選擇 ................................................................................... 10 支架加工定位基準(zhǔn)的選擇 .................................................................................. 10 粗基準(zhǔn)的選擇 .......................................................................................... 10 精基準(zhǔn)的選擇 .......................................................................................... 10 支架加工主要工序安排 ......................................................................................11 機(jī)械加工余量、工序尺寸及毛坯尺寸的確定 ................................................... 12 確定切削用量及基本工時 .............................................................................. 12 第 3 章 銑尺寸 120的右端面夾具設(shè)計 ............................................................................ 24 設(shè)計要求 ........................................................................................................... 24 夾具設(shè)計 ........................................................................................................... 24 定位基準(zhǔn)的選擇 ..................................................................................... 24 切削力及夾緊力的計算 .......................................................................... 24 夾具的夾緊裝置和定位裝置 [1] [2]............................................................................... 25 定位誤差的分析 ................................................................................................. 27 夾具設(shè)計及操作的簡要說明 ............................................................................... 27 第 4 章 鉆 2248。 20 夾具設(shè)計 .................................................. 錯誤 !未定義書簽。 夾具設(shè)計 ................................................................................. 錯誤 !未定義書簽。 切削力及夾緊力的計算 ................................................ 錯誤 !未定義書簽。 鉆套、襯套、鉆模板設(shè)計與選用 ............................................. 錯誤 !未定義書簽。 總 結(jié) ...................................................