上海交通大学：《现代机械工程图学》教学资源_教学课件_Lec13_metal

Processing Metals ME 250:Design Manufacturing I School of Mechanical Engineering Shanghai Jiao Tong University 1

Shanghai Jiao Tong University 1 Processing Metals ME 250: Design & Manufacturing I School of Mechanical Engineering

Outline ■Introduction ■Processing Metals Product Design Considerations ■ Summary Shanghai Jiao Tong University 2

Shanghai Jiao Tong University 2 Outline n Introduction n Processing Metals n Product Design Considerations n Summary

Introduction Processing technology Raw materials-products processing Shanghai Jiao Tong University 3

Shanghai Jiao Tong University 3 Introduction n Processing technology n Raw materials products processing

Processing Metals ■Casting(铸造 ) o b Bulk Deformation(压力加工) ■ Sheet Metal Forming(钣金加工) ■Material Removal Processes(切削加工) ■Joining Processes(连接技术) ■Advanced Processes Shanghai Jiao Tong University 4

Shanghai Jiao Tong University 4 Processing Metals n Casting （铸造） n Bulk Deformation （压力加工） n Sheet Metal Forming（钣金加工） n Material Removal Processes（切削加工） n Joining Processes （连接技术） n Advanced Processes

Casting Processes ■Introduction o S Sand Casting(砂型铸造) ■Permanent Mold Casting(金属模铸造) Die Casting(压力铸造) ■Investment Casting(熔模铸造) ■Centrifugal Casting(离心浇铸) ■ Shell Molding Shanghai Jiao Tong University 5

Shanghai Jiao Tong University 5 Casting Processes n Introduction n Sand Casting（砂型铸造） n Permanent Mold Casting（金属模铸造） n Die Casting（压力铸造） n Investment Casting（熔模铸造） n Centrifugal Casting（离心浇铸） n Shell Molding

Introduction Metal casting processes Molten metal poured into a mold to form a net shape Shanghai Jiao Tong University 6

Shanghai Jiao Tong University 6 Introduction n Metal casting processes n Molten metal poured into a mold to form a net shape

Sand Casting Most widely used casting process Most sand casting operations use silica sand (Silicon Dioxide)mixed with some clay and water.It is inexpensive and suitable as a mold material. ■ Can work with nearly any metals;esp.the ones with high melting temp.(steel,nickel,titanium). Low tolerance/surface finish:need subsequent machining Shanghai Jiao Tong University 7

Shanghai Jiao Tong University 7 Sand Casting n Most widely used casting process n Most sand casting operations use silica sand (Silicon Dioxide) mixed with some clay and water. It is inexpensive and suitable as a mold material. n Can work with nearly any metals;esp. the ones with high melting temp.(steel,nickel,titanium). n Low tolerance/surface finish: need subsequent machining

Sand Casting Sand cast products Sand Casting Shanghai Jiao Tong University 8

Shanghai Jiao Tong University 8 Sand Casting n Sand cast products

Sand Casting Sand casting consists of: Sand Casting 1.Placing a pattern(模样) Spruo Ricer Cope having the desired shape of Drag the casting in sand to make Dreg Wood pattern of casting The top halt is filed an imprint. Steol contairors (cope)wth sand and The casting pattern for tha sand. metal flow pathe are 2.Incorporating the gating is surrounded with sand. put in (sprue,gates.risers). system(浇铸系统) 3.Removing the pattern and The pattern is filling the cavity with molten removed and the casting is metal. poured. 4.Allowing the metal to cool Sorues,gates.and riaers are removed and solidify 5.Breaking away the sand mold to remove the casting 6.Removing the sprue(注入 口)and the riser(冒口). Shanghai Jiao Tong University 9

Shanghai Jiao Tong University 9 Sand Casting Sand casting consists of: 1. Placing a pattern（模样） having the desired shape of the casting in sand to make an imprint. 2. Incorporating the gating system（浇铸系统） 3. Removing the pattern and filling the cavity with molten metal. 4. Allowing the metal to cool and solidify 5. Breaking away the sand mold to remove the casting 6. Removing the sprue（注入 口） and the riser（冒口）

Sand Casting ■Mold(造型) Pouring Cup Riser Core Cope Sprue Drag Gating System Core Print Mold Cavity Shanghai Jiao Tong University 10

Shanghai Jiao Tong University 10 Sand Casting n Mold（造型）