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CA6140車床的型號831002撥叉零件的機械加工工藝規程及夾具設計

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更新時間：2014-09-04
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序言
機械制造工藝學課程設計是在我們學完了大學的全部基礎課、技術基礎課以及大部分專業課之后進行的.這是我們在進行畢業設計之前對所學的各種課程的一次深入而綜合的總復習,也是一次理論聯系實際的訓練.因此,它在我們四年的大學生活中占有重要的地位。
就我個人而言，我希望能通過這次課程設計,能夠綜合地系統化地掌握所學過的知識并加以應用,對自己未來將從事的工作進行一次適應性訓練，同時從中鍛煉自己分析問題、解決問題的能力，以便于以后更好地投入工作，為未來做好打算。
一.撥叉的工藝分析及生產類型的確定
1.撥叉的用途
該撥叉應用在CA6140型車床變速箱傳動軸上的換檔機構中.該撥叉頭以Φ25mm孔套在變速叉軸上,并用螺釘經螺紋孔M22mm與變速叉軸聯結,撥叉腳則夾在兩齒輪之間.當需要變速時,操縱變速手柄,變速操縱機構就通過撥叉壁部的操縱槽帶動撥叉與變速叉軸一起在變速箱中滑移,撥叉腳撥動三聯滑移變速齒輪在花鍵軸上滑動以改變檔位,從而改變車床主軸的旋轉速度.
該撥叉是在停車時用于換檔的,承受的彎曲應力和沖擊載荷較小,因此零件應具有的強度和韌性均不高.該零件的主要工作表面為撥叉腳兩端面、叉軸也(H7)、鎖銷螺紋孔M22×1.5mm、撥叉長槽,在設計工藝規程時應予以保證.

目錄
序言······························································2
CA6140車床的型號831002撥叉工藝規程設計
一.撥叉的工藝分析及生產類型的確定·································2
1.撥叉的用途···················································3
2.撥叉的技術要求···············································3
3.審查撥叉的工藝性·············································4
4.確定撥叉的生產類型···········································4
二. 確定毛坯,繪制毛坯簡圖·········································4
1.選擇毛坯······················································4
2.確定毛坯的尺寸公差和機械加工余量······························5
三.擬定撥叉工藝路線···············································5
1. 基面的選擇···················································5
2.表面加工方法的確定表面加工方法的確定··························6
3.加工階段的劃分················································6
4.工序的集中與分散···············································6
5.確定撥叉的生產類型············································6
6.工藝路線的確定················································7
四．機械加工余量、工序尺寸及公差的確定·······························8
五. 撥叉φ60孔切削用量、時間定額的計算·······························9
1.切削用量計算····················································10
2.時間定額的計算·················································10
六．機床夾具設計·····················································12
1.設計應考慮的問題················································12
2.定位方案設計····················································13
3. 工件誤差分析計算···············································13
4. 導向元件設計···················································14
5.夾緊裝置設計····················································14
6夾緊力與切削力的計算·············································16
7.夾具體的設計·····················································16

參考文獻·······························································18 ...

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