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Anglicky v odbornch pedmtech"Support of teaching technical subjects in EnglishTutorial: Engineering technology

Topic: Precision investment casting

Prepared by: Ing. Elena Nov

Projekt Anglicky v odbornch pedmtech, CZ.1.07/1.3.09/04.0002je spolufinancovn Evropskm socilnm fondem a sttnm rozpotem esk republiky.

Precision investment casting

Moulds for investment casting are made from easy melt-able materials like is wax or plastics. Thanks to high temperature used during forming difficult moulds with small diameters and smooth surfaces can be made. Moulds are accurate with smooth surface. Precision investment casting

Precision investment casting1) Manufacturing of forms for moulds. 2) Manufacturing of wax moulds.

3) Cluster casting of moulds.

4a) Manufacturing of shell moulds soaking of moulds into casting slip.

4b) Manufacturing of shell moulds powdering of wax moulds with refractory material

5) Extraction of wax moulds.

6) Shell firing

7) Melting and Casting

8) Ceramic disposal

9) Parting of moulds from gating system- cutting 10) Disposal of gating from moulds grinding

11) Completion work sand blasting, grinding, polishing 12) Monitoring Precision investment casting

For wax mould manufacturing is used few wax mixtures differentiating according to final use and physical quality. Wax for moulds clean (non filled)- filled - emulsified Waxes for gating systems Re-cultivated waxes Special waxes adhesiv - soaking - reparative - wax cores - soluble waxes Precision investment casting

http://u12133.fsid.cvut.cz/podklady/MPL/presne%20liti%20na%20vytavitelny%20model.pdf

http://u12133.fsid.cvut.cz/?udaj=predmet&id=C36010

Used Literature