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目 錄 1 緒論 ............................................................................................................................1 2 數(shù)控加工工藝概述 ....................................................................................................1 2.1 數(shù)控加工工藝分析的一般步驟與方法 .............................................................1 2.2 機(jī)床的合理選用 .................................................................................................1 2.3 數(shù)控加工零件工藝性分析 .................................................................................2 2.3.1 零件圖樣上尺寸數(shù)據(jù)的給出應(yīng)符合編程方便的原則 ..............................2 2.3.2 零件各加工部位的結(jié)構(gòu)工藝性應(yīng)符合數(shù)控加工的特點(diǎn) ..........................2 2.4 加工方法的選擇與加工方案的確定 .................................................................2 2.4.1 加工方法的選擇 ..........................................................................................2 2.4.2 加工方案確定的原則 ..................................................................................3 2.5 工序與工步的劃分及加工順序安排 .................................................................3 2.5.1 工序的劃分 ...................................................................................................3 2.5.2 工步的劃分 ..................................................................................................3 2.5.3 加工順序安排 ..............................................................................................4 2.6 零件的安裝與夾具的選擇 .................................................................................4 2.6.1 定位安裝的基本原則 ..................................................................................4 2.6.2 選擇夾具的基本原則 ..................................................................................4 2.7 刀具的選擇與切削用量的確定 .........................................................................4 2.7.1 刀具的選擇 ..................................................................................................4 2.7.2 切削用量的確定 ..........................................................................................5 2.8 對(duì)刀點(diǎn)與換刀點(diǎn)的確定 .....................................................................................5 2.9 加工路線的確定 .................................................................................................5 3 撥叉零件數(shù)控加工工藝分析 ....................................................................................6 3.1 撥叉零件的作用 .................................................................................................6 3.2 撥叉零件的工藝分析 .........................................................................................7 3.3 確定撥叉零件生產(chǎn)類型 .....................................................................................7 3.4 確定撥叉零件毛坯類型 .....................................................................................7 3.4.1 確定毛坯種類 ..............................................................................................7 3.4.2 確定鑄件加工余量及形狀 ..........................................................................7 3.4.3 繪制鑄件零件圖 ..........................................................................................8 3.5 撥叉零件數(shù)控加工工藝規(guī)程設(shè)計(jì) .....................................................................8 3.5.1 選擇定位基準(zhǔn) ..............................................................................................8 3.5.2 制定數(shù)控加工工藝路線 ..............................................................................8 3.6 機(jī)械加工余量、工序尺寸及公差的確定 ..........................................................9 3.6.1 圓柱表面工序尺寸 ......................................................................................9 3.6.2 平面工序尺寸 ............................................................................................10 3.6.3 確定切削用量及時(shí)間定額 ........................................................................10 4 夾具設(shè)計(jì) ..................................................................................................................19 4.1 問(wèn)題的提出 .......................................................................................................19 4.2 夾具設(shè)計(jì) ...........................................................................................................19 4.2.1 定位基準(zhǔn)選擇 ............................................................................................19 4.2.2 切削力及夾緊力計(jì)算 .................................................................................20 4.3 定位誤差分析 ....................................................................................................20 4.3.1 定位元件尺寸及公差的確定 .....................................................................20 4.3.2 計(jì)算鉆套中心線與工作臺(tái)的垂直度誤差 .................................................20 4.3.3 計(jì)算定位銷軸與工作臺(tái)的平行度誤差 .....................................................21 4.4 夾具設(shè)計(jì)及操作的簡(jiǎn)要說(shuō)明 ............................................................................21 5 結(jié)束語(yǔ) .......................................................................................................................23 致謝 ..............................................................................................................................24 參考文獻(xiàn) ......................................................................................................................25