機(jī)械制造課程設(shè)計(jì)說明書范本(更新版)
【正文】 要求。（3）求鑄件尺寸公差公差帶相對(duì)于基本尺寸對(duì)稱分布。、粗基準(zhǔn)的選擇粗基準(zhǔn)的選擇影響影響各加工面的余量分配及不需加工表面與加工表面之間的位置精度。的倒角工序六：(1)，（2），用Φ10的絲錐攻絲，加工M10的螺紋孔。的倒角。，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。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。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=。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。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)本夾具是用立式銑床加工換擋叉的叉口下表面專用夾具。夾具的結(jié)構(gòu)設(shè)計(jì)詳見裝配
環(huán)評(píng)公示相關(guān)推薦
鄂ICP備17016276號(hào)-1