Lecture 6 Sept 6

Cleaning department of materials science and

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Unformatted text preview: ern making 2.  Core making 3.  Molding 4.  Melting and Pouring 5.  Cleaning Department of Materials Science and Engineering 6 NC State University Sand Casting Example Department of Materials Science and Engineering 7 NC State University Sand Casting Example Department of Materials Science and Engineering 8 NC State University Functions of a Pattern / Pattern Materials Functions of a pattern 1.  Prepares a mold cavity 2.  May contain core projections, runners, gates, sprues… 3.  Finished and smooth surfaces 4.  Minimized overall cost Pattern Materials 1.  Easily worked, shaped and joined 2.  Lightweight 3.  Strong, hard and durable 4.  Resistant to wear and corrosion 5.  Dimensionally stable 6.  Low cost Department of Materials Science and Engineering 9 NC State University Shrinkage Allowances Most cast metals shrink or contract volumetrically on cooling - Liquid Shrinkage: change from liquid to solid state Solution: Use of risers - Solid Shrinkage: when metal loses temperature in the solid state Solution: Shrinkage Allowance Department of Materials Science and Engineering 10 NC State University Shrink Rule Contraction of Various Metals Department of Materials Science and Engineering 11 NC State University Draft or Taper Allowance No Draft or Vertica...
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