CA6140車床的型號(hào)831002撥叉零件的機(jī)械加工工藝規(guī)程及夾具設(shè)計(jì)
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- 序 言
機(jī)械制造工藝學(xué)課程設(shè)計(jì)是在我們學(xué)完了大學(xué)的全部基礎(chǔ)課、技術(shù)基礎(chǔ)課以及大部分專業(yè)課之后進(jìn)行的.這是我們?cè)谶M(jìn)行畢業(yè)設(shè)計(jì)之前對(duì)所學(xué)的各種課程的一次深入而綜合的總復(fù)習(xí),也是一次理論聯(lián)系實(shí)際的訓(xùn)練.因此,它在我們四年的大學(xué)生活中占有重要的地位。
就我個(gè)人而言，我希望能通過(guò)這次課程設(shè)計(jì),能夠綜合地系統(tǒng)化地掌握所學(xué)過(guò)的知識(shí)并加以應(yīng)用,對(duì)自己未來(lái)將從事的工作進(jìn)行一次適應(yīng)性訓(xùn)練，同時(shí)從中鍛煉自己分析問(wèn)題、解決問(wèn)題的能力，以便于以后更好地投入工作，為未來(lái)做好打算。
一.撥叉的工藝分析及生產(chǎn)類型的確定
1.撥叉的用途
該撥叉應(yīng)用在CA6140型車床變速箱傳動(dòng)軸上的換檔機(jī)構(gòu)中.該撥叉頭以Φ25mm孔套在變速叉軸上,并用螺釘經(jīng)螺紋孔M22mm與變速叉軸聯(lián)結(jié),撥叉腳則夾在兩齒輪之間.當(dāng)需要變速時(shí),操縱變速手柄,變速操縱機(jī)構(gòu)就通過(guò)撥叉壁部的操縱槽帶動(dòng)撥叉與變速叉軸一起在變速箱中滑移,撥叉腳撥動(dòng)三聯(lián)滑移變速齒輪在花鍵軸上滑動(dòng)以改變檔位,從而改變車床主軸的旋轉(zhuǎn)速度.
該撥叉是在停車時(shí)用于換檔的,承受的彎曲應(yīng)力和沖擊載荷較小,因此零件應(yīng)具有的強(qiáng)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(zhǎng)槽,在設(shè)計(jì)工藝規(guī)程時(shí)應(yīng)予以保證.
目 錄
序言······························································2
CA6140車床的型號(hào)831002撥叉工藝規(guī)程設(shè)計(jì)
一.撥叉的工藝分析及生產(chǎn)類型的確定·································2
1.撥叉的用途···················································3
2.撥叉的技術(shù)要求···············································3
3.審查撥叉的工藝性·············································4
4.確定撥叉的生產(chǎn)類型···········································4
二. 確定毛坯,繪制毛坯簡(jiǎn)圖·········································4
1.選擇毛坯······················································4
2.確定毛坯的尺寸公差和機(jī)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(chǎn)類型············································6
6.工藝路線的確定················································7
四．機(jī)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(shí)間定額的計(jì)算·······························9
1.切削用量計(jì)算····················································10
2.時(shí)間定額的計(jì)算·················································10
六．機(jī)床夾具設(shè)計(jì)·····················································12
1.設(shè)計(jì)應(yīng)考慮的問(wèn)題················································12
2.定位方案設(shè)計(jì)····················································13
3. 工件誤差分析計(jì)算···············································13
4. 導(dǎo)向元件設(shè)計(jì)···················································14
5.夾緊裝置設(shè)計(jì)····················································14
6夾緊力與切削力的計(jì)算·············································16
7.夾具體的設(shè)計(jì)·····················································16
參考文獻(xiàn)·······························································18 ...
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