4.20 Week12 Note

This week is about Molding and Casting.

molding

types

• injection (sprue浇口, runner流道, gate, vent通气孔, parting line分模线, flashing)

  

  

• insert

• vacuum

  

• blow (make bottles)

  

• rototional

  

• flexible, soft

materials

• low-temp wax

  

• machineable wax -- main material

  

• rigid foam (make large mold)

  

• gesso, hot air

• alginate gel (make face/hand mask)

  

• urethane rubber, plastic (very strong)

  

• silicone

  

• PDMS (polydimethylsiloxane)

• latex (paint)
• thermoplastic, thermoset polymers

• calcium sulfate 硫酸钙

  • desicant干燥剂, coagulant凝结剂, plaster石膏, gypsum石膏, drywall
  • DryStone

• Portland cement

  • calcium silicate, aluminum/iron oxide, calcium sulfate
  • Hydro-Stone
• metal casting
  • Cerrotru, Zamak, aluminum
  • clay sand
• glass
• ceramic
• food

additives

• fibers (tension, compression, composites)
• fillers: density, conductivity, flexibility, color, ...

processing

• testing
• mixing (not draw air in)
• pouring (thin beam)
  • starting
  • filling (till to an angle)
  • vent location
• bubbles
  • vibration, vacuum, pressure
• curing固化
  • polymerization聚合
  • cross-linking交联
  • hydration水合作用
  • endothermic吸热, exothermic放热
• demolding
  • taper
  • release agents
    • dilute dish soap, vaseline, talc, ...
  • deformation
• storage
• shelf life

safety

• warnings
• MSDS: SDS search
• ventilation通风
• protection: glues, mask
• disposal

machining

• rough, finish cuts
• cut depth, shank, collet

software

• ShopBot VCarvePro

• fab modules

  • image, mold

    

  • stl, toolpath, mold

    calculating path in fabmodules

more material

• Plastic Injection Molding
• Molding and Casting, or, Confessions of a Cat Lady