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Anglicky v odborných předmětech "Support of teaching technical subjects in English “

Anglicky v odborných předmětech "Support of teaching technical subjects in English “. Tutorial : Engineering technology Topic : Casting to temporary forms Prepared by: Ing. Elena Nová. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002

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Anglicky v odborných předmětech "Support of teaching technical subjects in English “

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  1. Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“ Tutorial: Engineering technology Topic: Casting to temporaryforms Prepared by: Ing. Elena Nová Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

  2. Casting to temporary forms With permanent pattern With lost pattern Hand forming Machine forming Vakuum forming Monocoque forming Precision casting Investment casting

  3. Forming with permanent model • 1. Manual forming. This method is used for large castings. For castings, needed only in small quantities. In this picture we see the casting form produced by manually shaping under the crane to frame 1000x1000 mm.

  4. Forming with permanent model • Procedure: • Model is made in accordance to drawing • Half of model is laid on modeling desk • Suitable frame is superimposed and model is sand-rammed • After ramming excessive sand is raked away by a ruler • Frame is turned by 180 deg. and second half of model is superimposed • Gating system, exhaust and second frame is rammed Frame is put together and weighted • Cooled raw casting is removed • Exhaust system and gating is removed

  5. Models on plates for hand forming Model’s colored. is chosen according to cast iron type: Red is for grey iron.

  6. Forming with permanent model • On “FOROMAT” (shaking with pressing)to frames of max. dimension 600x650 mm small to ’medium’ series production • 2.Machine forming

  7. Forming with permanent model • Procedure for machine forming is the same as with hand forming except ‘ramming and raw casting separation is done by machines. • Machined forms and resulting casts are more accurate with smoother surface.

  8. Forming with permanent model • 3.Vacuum forming • Here is form’s cohesiveness kept under pressure . • After cooling down of casting the sub-atmospheric pressure is zeroed and casting is removed. • Casting sand can be used again.

  9. Forming with permanent model • 4. Shell forming • In this type a shell forms (only few milimetres thick) are used made from silicon sand and resin. • Casting have surface of very high quality (Ra 6,3) and exact dimensions.

  10. Slovníček • Formování s trvalým modelem • Modely na deskách pro ruční formování malosériová a sériová výroba Ruční formování Strojní formování Vakuové formování Skořepinové formování

  11. Cvičení • Vyjmenuj způsoby formování s trvalým modelem: • 1. • 2. • 3. • 4. • Najdi na internetu příklady použití,které výrobky se daným způsobem odlévají. • 1.Které způsoby formování používáme pro maloseriovou výrobu : • 2.Které způsoby formování používáme pro velkoseriovou výrobu:

  12. Used literature • Moderní strojírenství pro školu i praxi. • Josef Dillinger a kol.Europa-Sobotáles cz., Praha 2007

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