設(shè)計(jì)“變速器換擋叉”零件的機(jī)械加工工藝規(guī)程及機(jī)床夾具-免費(fèi)閱讀
【正文】 夾具的結(jié)構(gòu)設(shè)計(jì)詳見裝配圖。23工序六12 工序額的確定（1）Td=Tj+Tf+Tb+Tx+Tz/N = Tj1～19+ Tf+Tb+Tx = (Tj1Tj19)+18% (Tj1Tj19)+5%( Tj+Tf)+3% ( Tj+Tf) = (Tj1Tj19)+18% (Tj1Tj19)+5%（(Tj1Tj19)+18% (Tj1Tj19)）+3% （(Tj1Tj19)+18% (Tj1Tj19)）Tj=+……+=Td=+18%+5%(+18%)+3%(+18%) = =192s(2)工序二的時(shí)間定額：Td=Tj+Tf+Tb+Tx+Tz/N =Tj1+Tj2+Tj3+Tf+Tb+Tx =(Tj1+……+Tj5)+ 18% (Tj1+……Tj5)+ 5%(Tj+Tf)+ 3% (Tj+Tf) =(Tj1+……+Tj5) + 18% (Tj1+……Tj5)+ 5%((Tj1+……+Tj5)+ 18% (Tj1+……Tj5))+3%((Tj1+……+Tj5)+ 18% (Tj1+……Tj5))Tj=++++=Td=+18%+5%(+18%)+3%(+18%) = =(3)工序三的時(shí)間定額：Td=Tj+Tf+Tb+Tx+Tz/N =Tj1+Tj2+Tj3+Tf+Tb+Tx =Tj1+18% Tj1+5%(Tj+Tf) + 3% (Tj+Tf) = Tj1+18% Tj1+5%( Tj1+18% Tj1)+ 3%( Tj1+18% Tj1) =+18%+5%(+18%)+3%(+18%) = =（4）工序四的時(shí)間定額：Td=Tj+Tf+Tb+Tx+Tz/N =Tj1+Tj2+Tj3+Tf+Tb+Tx =Tj1+18% Tj1+5%(Tj+Tf) + 3% (Tj+Tf) = Tj1+18% Tj1+5%( Tj1+18% Tj1)+ 3%( Tj1+18% Tj1) =+18%+5%(+18%)+3%(+18%) =（5）工序五德時(shí)間定額：Td=Tj+Tf+Tb+Tx+Tz/N =Tj1+Tj2+Tj3+Tf+Tb+Tx =Tj1+18% Tj1+5%(Tj+Tf) + 3% (Tj+Tf) = Tj1+18% Tj1+5%( Tj1+18% Tj1)+ 3%( Tj1+18% Tj1) =+18%+5%(+18%)+3%(+18%) =（6）工序六的時(shí)間定額：Td=Tj+Tf+Tb+Tx+Tz/N =Tj1+Tj2+Tj3+Tf+Tb+Tx =Tj1+18% Tj1+5%(Tj+Tf) + 3% (Tj+Tf) = Tj1+18% Tj1+5%( Tj1+18% Tj1)+ 3%( Tj1+18% Tj1) =+18%+5%(+18%)+3%(+18%) =第七章：夾具的設(shè)計(jì)為了提高勞動(dòng)生產(chǎn)率，保證加工質(zhì)量，降低勞動(dòng)強(qiáng)度，需要設(shè)計(jì)專業(yè)夾具。Tj與Ｔf和稱為作業(yè)時(shí)間 Tb是指布置工作時(shí)間，一般按作業(yè)時(shí)間的（２７）％估算 Tx是指休息及生理需要時(shí)間，一般按作業(yè)時(shí)間的（２４）％估算 Tz是指準(zhǔn)備與終結(jié)時(shí)間，大量生產(chǎn)時(shí)，準(zhǔn)備與終結(jié)時(shí)間忽略不計(jì) ?。问侵敢慌慵膫€(gè)數(shù)下表是各個(gè)工步基本時(shí)間的計(jì)算公式及其結(jié)果工序工步計(jì)算公式計(jì)算結(jié)果（min）工序一1鉆：Tj=(l+l1+l2)/(fn)l=16l1=D/2cotKa+(12) l2:(14)Ka=90176。查表取每齒進(jìn)給量，查表取af=背吃刀量取4mm查表得：V=64m/min Pm=計(jì)算實(shí)際主軸轉(zhuǎn)速主軸轉(zhuǎn)速n=100064/（20）= r/min ,查表得n=1000 r/min ，計(jì)算Vc=100020/1000= m/min功率校核PM= kwP經(jīng)檢查所有要求符合要求 工步二：精銑叉口上端面選擇鑲齒套式面銑刀，齒數(shù)z=10，材料YG6，fz=。50 工序是銑削撥槽的下端面和鉆孔加工M10*1的螺紋孔，可以選用臥式銑床完成55 ，采用萬能無心磨床來保證精度。，先用Φ14的麻花鉆鉆孔，再用選用Φ15的擴(kuò)孔鉆擴(kuò)孔，可選用立式搖臂鉆床完成。的倒角。的倒角工序六：(1)，（2），用Φ10的絲錐攻絲，加工M10的螺紋孔。、粗基準(zhǔn)的選擇粗
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