【正文】 西南科技大學(xué)本科生畢業(yè)論文 I 工程機(jī)柴油機(jī)連桿工藝及其夾具設(shè)計(jì) 摘要 ： 連桿是柴油機(jī)的主要傳動(dòng)構(gòu)件之一，其作用是把活塞和曲軸聯(lián)接起來，使活塞的往復(fù)直線運(yùn)動(dòng)變?yōu)榍S的回轉(zhuǎn)運(yùn)動(dòng)，以輸出動(dòng)力。因此，連桿工作的穩(wěn)定性、可靠性對(duì)柴油機(jī)的整機(jī)質(zhì)量至關(guān)重要，質(zhì)量輕、精度高的連桿，有助于降低柴油機(jī)的能耗和噪聲。 柴油機(jī)連桿的加工工藝是影響柴油機(jī)連桿機(jī)械性能的重要因素，本文重要對(duì)柴油機(jī)連桿的加工工藝和夾具進(jìn)行設(shè)計(jì)。 關(guān)鍵詞 ：連桿； 加工工藝； 定位基準(zhǔn)； 夾具設(shè)計(jì) 西南科技大學(xué)本科生畢業(yè)論文 II Engineering Machine Diesel Engine connecting rod and fixture design process Abstract: The diesel engine connecting rod is one of the main drive ponents, its role is to link up the piston and the crankshaft, the piston of the reciprocating linear motion into rotary crankshaft motion, to output power. Therefore, the linkage of work stability, reliability is critical to the quality of the diesel engine machine, light weight, high precision, connecting rod, help reduce energy consumption and engine noise. Diesel engine connecting rod of diesel processing technology is an important factor in the mechanical properties of connecting rod, this important process of diesel engine connecting rod and fixture design. Key words: rod。 processing technology。 positioning reference。 fixture design. 西南科技大學(xué)本科生畢業(yè)論文 III 目 錄 第一章 緒 論 ................................................................................ 1 概述 ................................................................................................................. 1 國(guó)內(nèi)外研究現(xiàn)狀和發(fā)展趨勢(shì) ......................................................................... 1 國(guó)內(nèi)柴油機(jī)連桿市場(chǎng)狀況 ............................................................................. 2 連桿的結(jié)構(gòu)特點(diǎn) ............................................................................................. 2 第二章 連桿的主要技術(shù)要求 ............................................................ 4 材料選擇 ........................................................................................................ 4 表面質(zhì)量 ........................................................................................................ 4 熱處理 ............................................................................................................. 5 加工精度 ........................................................................................................ 6 重量 ................................................................................................................ 6 第三章 連桿毛坯的選擇 ................................................................... 7 第四章 連桿加工工藝過程 ............................................................... 9 柴油機(jī)連桿加工工藝過程 ............................................................................. 9 柴油機(jī)連桿主要表面技術(shù)要求 ................................................................... 14 第五章 連桿機(jī)械加工工藝過程分析 ................................................15 工藝過程安排 .............................................................................................. 15 定位基準(zhǔn)的選擇 ........................................................................................... 15 定位基準(zhǔn)選擇得原則 ......................................................................... 15 粗基準(zhǔn)的選擇 ..................................................................................... 16 精基準(zhǔn)的選擇 ..................................................................................... 17 加緊力的方向和位置 ................................................................................... 19 夾緊力的方向 ..................................................................................... 20 夾緊力位置 ......................................................................................... 20 各主要表面的加工方法及工藝 ................................................................... 21 主要表面的加工方法 ........................................................................ 21 工藝過程 ............................................................................................ 22 加工工序 ....................................................................................................... 23 其他輔助工序 ............................................................................................... 25 熱處理工序 ......................................................................................... 25 檢查工序 ............................................................................................. 26 清洗工序 ............................................................................................. 27 去毛刺工序 ......................................................................................... 27 第六章 連桿加工中工序余量和尺寸分析 ........................................28 加工余量的確定 .......................................................................................... 28 連桿加工余量 計(jì)算 ....................................................................................... 30 連桿大下頭孔兩平面加工余量 ......................................................... 30 連桿工時(shí)定額計(jì)算 ....................................................................................... 30 西南科技大學(xué)本科生畢業(yè)論文 IV 粗銑連桿大小頭平面 ......................................................................... 30 精銑連桿大小頭面 ............................................................................. 30 粗磨連桿大小頭平面 ......................................................................... 30 精磨連桿大小頭平面 ......................................................................... 31 粗銑連桿兩側(cè)面 ................................................................................. 31 精銑連桿大頭孔兩側(cè)面 ..................................................................... 31 鉆小頭孔 ............................................................................................. 31 擴(kuò)小頭孔 ............................................................................................. 32 半精鏜小頭孔 .......................................................