Gating & Riser Design 101


"Been to several classes outside of AFS, though this class was only two days long, it gave me more useful information than the week-long classes elsewhere."


Gating design directly impacts casting quality and yield. This course guides participants through the basic functions of gating and risers to provide clean, sound, and functional castings. An introduction to fluid flow and solidification will serve to guide participants through key design concepts of the various functional elements of good gating and riser design.

Emphasis will be placed on hands-on activities, animations, and simulations to enhance understanding of the filling and solidification processes in a foundry. The focus will be on practical examples in iron, steel, aluminum, and copper castings. The goal is to introduce to the participants the basics of gating and riser design, common industry norms and troubleshooting.

Learning outcomes

Class participants will learn to:

  • Identify how casting quality requirements impact gating and risers.
  • Describe the function of risers.
  • Identify the effects of different alloys on riser size and location.
  • Identify the effects of production process parameters on riser size and location.
  • Determine riser locations.
  • Calculate the size of riser and connections.
  • Demonstrate the basic applications of chills.
  • List unique riser considerations for iron castings.
  • Describe the function and features of a gating system.
  • Identify the effects of different alloys on a gating system.
  • Identify the effects of process parameters on gating system design.
  • Determine gate sizes and locations.
  • Describe the basics of fluid dynamic principles.

Course Length

2.0 days

CEU Units

1.20 CEU

Course outline

Module 1: Introduction
Module 2: The Gating and Risering System

•    The Rigging System
•    Customer Requirements
•    Function of the Gating and Riser System

Module 3: Riser Considerations

•    Riser Types and Functions
•    Solidification
•    Alloy Considerations

Module 4: Riser Placement

•    Casting Geometry Considerations
•    Process Considerations

Module 5: Cast Iron Castings

•    Cast Iron Specific Considerations
•    Tools for Placing and Sizing Risers

Module 6: Gating Design

•    Fluid Flow Principles
•    Layout
•    Calculating Gate Size

Module 7: Part Design Influence

•    Casting Geometry
•    Alloy Considerations

Module 8: Process Parameters

•    Pouring Practices
•    Defects and Troubleshooting

Module 9: Conclusion