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摘 要
本次畢業(yè)設(shè)計的的題目是連桿的工藝工裝及夾具設(shè)計。連桿是柴油機的主要傳動件之一，連桿是汽車發(fā)動機中的主要傳動部件之一，它在柴油機中，把作用于活塞頂面的膨脹的壓力傳遞給曲軸，又受曲軸的驅(qū)動而帶動活塞壓縮氣缸中的氣體。本文主要論述了連桿的加工工藝及其夾具設(shè)計。連桿的尺寸精度、形狀精度以及位置精度的要求都很高，而連桿的剛性比較差，容易產(chǎn)生變形，因此在安排工藝過程時，就需要把各主要表面的粗精加工工序分開。逐步減少加工余量、切削力及內(nèi)應(yīng)力的作用，并修正加工后的變形，就能最后達(dá)到零件的技術(shù)要求。
關(guān)鍵詞: 連桿；變形；加工工藝；夾具設(shè)計
Abstract
The connecting rod is one of the main driving medium of diesel engine, this text expounds mainly the machining technology and the design of clamping device of the connecting rod. The precision of size, the precision of profile and the precision of position , of the connecting rod is demanded highly , and the rigidity of the connecting rod is not enough, easy to deform, so arranging the craft course, need to separate the each main and superficial thick finish machining process. Reduce the function of processing the surplus , cutting force and internal stress progressively , revise the deformation after processing, can reach the specification requirement for the part finally .
Keyword: Connecting rod；Deformination；Processing technology；Design of clamping device
目 錄
摘要···········································································································································Ⅰ
Abstract························································································································Ⅱ
緒論·············································································································································1
1 連桿加工工藝························································································································2
1.1 連桿的結(jié)構(gòu)特點··············································································································2
1.2 連桿的主要技術(shù)要求······································································································2
1.2.1 大、小頭孔的尺寸精度、形狀精度···········································································3
1.2.2 大、小頭孔軸心線在兩個互相垂直方向的平行度···················································3
1.2.3 大、小頭孔中心距·······································································································3
1.2.4 連桿大頭孔兩端面對大頭孔中心線的垂直度···························································3
1.2.5 大、小頭孔兩端面的技術(shù)要求···················································································4
1.2.6 2-Φ15螺栓孔的技術(shù)要求··························································································4
1.2.7 有關(guān)2-Φ15孔兩端面的技術(shù)要求··············································································4
1.3 連桿的材料和毛坯········································································································4
1.4 連桿的機械加工工藝過程····························································································6
1.5 連桿的機械加工工藝過程分析······················································································8
1.5.1 工藝過程的安排···········································································································8
1.5.2 定位基準(zhǔn)的選擇···········································································································8
1.5.3 確定合理的夾緊方法 ·································································································9
1.5.4 連桿兩端面的加工 ·····································································································9
1.5.5 連桿大、小頭孔的加工·······························································································9
1.5.6 連桿2-Φ15螺栓孔的加工· ······················································································10
1.6 確定各工序的加工余量、計算工序尺寸及公差·························································10
1.7 工時定額的計算 ··········································································································12
1.7.1粗銑連桿大小頭上端面·······························································································12
1.7.2粗銑連桿大小頭下端面·······························································································12
1.7.3精銑連桿大頭Φ70H7孔兩端面·················································································13
1.7.4銑結(jié)合面·······················································································································13
1.7.5銑連桿蓋寬60兩側(cè)面······························································································14
1.7.6銑連桿體寬64兩側(cè)面······························································································14
1.7.7粗銑、精銑2-Φ15螺紋孔兩端面···········································································15
1.7.8鉆、擴、鉸2-Φ15H8螺栓孔并倒角C1、C1.5······················································16
1.7.9锪連桿蓋Φ15深8孔································································································17
1.7.10锪、鉸連桿體Φ8H11深6孔··················································································18
1.7.11鉆2-Φ7孔················································································································20
1.7.12鉆2-Φ5孔（頭部Φ10，角度90）····································································20
1.7.13粗鏜、半精鏜Φ70H7孔、Φ46H7孔······································································21
1.7.14精鏜Φ70H7孔、Φ46H7孔并倒角C1····································································22
1.7.15半精鏜、精鏜Φ40H7銅套孔··················································································23
1.8 連桿的檢驗··················································································································24
1.8.1 觀察外表缺陷及目測表面粗糙度···········································································24
1.8.2 連桿大頭孔圓柱度的檢驗·······················································································24
1.8.3 連桿體、連桿上蓋對大頭孔中心線的對稱度的檢驗···········································24
1.8.4 連桿大小頭孔平行度的檢驗···················································································24
1.8.5 連桿螺栓孔與其兩端面垂直度的檢驗···································································25
2 夾具設(shè)計······························································································································26
2.1問題的提出···················································································································26
2.2 定位基準(zhǔn)的選擇··········································································································26
2.3 切削力和夾緊力計算··································································································26
2.4 定位誤差分析··············································································································28
2.5 定位鍵和對刀裝置的設(shè)計··························································································28
2.6 夾具工作原理··············································································································31
結(jié)論·········································································································································33
致謝·········································································································································34
參考文獻(xiàn)·································································································································35
VII