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Note for Production Design and Production Tooling - PDPT By Asha Dash

  • Production Design and Production Tooling - PDPT
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Asha Dash
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Risers and Riser Design • General design rules for riser necks used in iron castings; a. general riser b. side riser for plates c. top round riser Mech 423 #2 1

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Gating System Design Figure 5.10 (a) Castings with blind feeders, F2 is correctly vented but has mixed results on sections S3 and S4. Feeder F3 is not vented and therefore does not feed at all. The unfavourable pressure gradient draws liquid from a fortuitous skin puncture in section S8. The text contains more details of the effects. (b) The plastic coffee cup analogue: the water is held up in the upturned cup and cannot be released until air is admitted via a puncture. The liquid it contains is then immediately released. Mech 423 #2 2

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Gating System Design A - gates B - runner C - Sprue exit (Choke) • System is often designed to follow ratio of (CSA) 1:2:2, or 1:4:4 WRT: • • Un-pressurized system reduces metal velocity and turbulence • Sprue exit CSA C : total runner CSA B: total gate CSA A • Gating system is un-pressurized Pressurized systems usually if area is increasing (e.g. 1:4:4) reduce size and weight of gating or pressurized if there is a system (pressure at constriction constriction (4:8:3). (gate) causes metal to completely fill runner more quickly) Mech 423 #2 3

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MECH 423 Casting, Welding, Heat Treating and NDT Time: _ _ W _ F 14:45 - 16:00 Credits: 3.5 Session: Fall Expendable Mould Casting Lecture 3 Lecture 3 4

Lecture Notes