Transcription of Section two Risering System Design - Sorelmetal
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Section two Risering System Design - Sorelmetal
19 Section twoRisering System DesignPlease note: Risering must be done before gating System can be shaped (Heine) risers are now the riser of choice in themajority of Risering System Objectives: castings without shrinkage defects economic production maximize casting Essential Components Riser always blind (closed top).Riser contact generally as short as dimensions always measured at thenotch. Gate thin and wide for fast freezing (see p. 28). Vents to assist fast mould The Following are Suggested by Research andSupported by Industrial Experience Volume change patterns of cooling and solidifyinggraphitic irons result in net volume increase of ironin the mould. The net volume increase can produce liquid pres-sure in the mould of several hundred (2 MPa). This pressure always exceeds the elastic limit ofthe mould, except for very rigid moulds, leading tomould enlargement and swollen castings, oftencontaining shrinkage defects.
2.0 RISERING SYSTEM DESIGN 2.1 Objectives: • castings without shrinkage defects • economic production – maximize casting yield 2.2 Essential Components
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