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1 目 錄 目 錄 ...................................................................................................................................................................1 緒 論 .................................................................................................................................................................3 1 連桿加工工藝 ...............................................................................................................................................4 1.1 連桿的結構特點 ................................................................................................................................4 1.2 連桿的主要技術要求 ..............................................................................................................................4 1.2.1 大、小頭孔的尺寸精度、形狀精度 ...............................................................................................5 1.2.2 大、小頭孔軸心線在兩個互相垂直方向的平行度 .......................................................................5 1.2.3 大、小頭孔中心距 ...........................................................................................................................5 1.2.4 連桿大頭孔兩端面對大頭孔中心線的垂直度 ...............................................................................5 1.2.5 大、小頭孔兩端面的技術要求 .......................................................................................................6 1.2.6 2-15 螺栓孔的技術要求 ............................................................................................................6 1.2.7 有關 2-15 螺栓孔兩端面的技術要求 .........................................................................................6 1.3 連桿的材料和毛坯 ................................................................................................................................6 1.4 連桿的機械加工工藝過程 ................................................................................................................8 1.5 連桿的機械加工工藝過程分析 ..............................................................................................................9 1.5.1 工藝過程的安排 ...............................................................................................................................9 1.5.2 定位基準的選擇 .............................................................................................................................10 1.5.3 確定合理的夾緊方法 .....................................................................................................................10 1.5.4 連桿兩端面的加工 .........................................................................................................................11 1.5.5 連桿大、小頭孔的加工 .................................................................................................................11 1.5.6 連桿 2-15 螺栓孔的加工 ...........................................................................................................11 1.6 確定各工序的加工余量、計算工序尺寸及公差 ................................................................................11 1.7 工時定額的計算 ....................................................................................................................................13 1.7.1粗銑連桿大小頭上端面 ..................................................................................................................13 1.7.2粗銑連桿大小頭下端面 ................................................................................................................14 1.7.3粗鏜、半精鏜 70H7 孔、46H7 孔 .........................................................................................14 1.7.4 精銑連桿大頭 70H7 孔兩端面 ....................................................................................................15 1.7.5、粗銑、精銑 2-15 螺栓孔兩端面 .............................................................................................16 1.7.6 銑寬 60兩側面 ................................................................................................................................17 1.7.7 銑寬 64兩側面 ................................................................................................................................17 1.7.8 鉆、擴、鉸 2-15H8 螺栓孔并倒角 C1、C1.5 ...........................................................................18 1.7.9 鉆 2-7 孔 ......................................................................................................................................19 1.7.10 鉆 2-5 孔(頭部 10,角度 90) ......................................................................................19 1.7.11精鏜 70H7 孔、46H7 孔 .......................................................................................................20 1.7.12半精鏜、精鏜 40H7 銅套孔 ....................................................................................................20 1.8 連桿的檢驗 ............................................................................................................................................21 1.8.1 觀察外表缺陷及目測表面粗糙度 .................................................................................................21 1.8.2 連桿大頭孔圓柱度的檢驗 .............................................................................................................21 1.8.3 連桿體、連桿上蓋對大頭孔中心線的對稱度的檢驗 .................................................................21 1.8.4 連桿大小頭孔平行度的檢驗 .........................................................................................................22 2 2 夾具設計 .......................................................................................................................................................23 2.1 問題的指出 .........................................................................................................................................23 2.2 夾具設計 ............................................................................................................................................23 1) 定位基準的選擇 .................................................................................................................................23 2) 夾緊方案 .............................................................................................................................................23 3) 夾具體設計 .........................................................................................................................................23 4) 切削力及夾緊力的計算 .....................................................................................................................23 5) 定位誤差分析 .....................................................................................................................................24 結 論 .........................................................................................................................................................25 致 謝 .........................................................................................................................................................26 參考文獻 ...................................................................................................................................................27
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