Dimensional Repeatability of the Die Casting Process
 
This text presents analyses of several of the more significant variables that cause dimensional variation between castings. Some of the variations discussed include linear dimensions, dimensions across the parting line and casting warpage. Variables discussed include shrinkage during quench, die temperature, casting ejection temperature, shot speed, die locking forces and gating. New for this edition is a valuable discussion of measurement system variation in casting plants, as well as methods to calculate measurement system variation. This information is based on a study conducted by the Pennsylvania State University.
 
Item #E-211, 53 pages, 1998.
 

Dimensional Repeatability of the Die Casting Process

TABLE OF CONTENTS

Preface

Introduction

Chapter 1:  Dimensional Variation

Chapter 2:  Linear Dimensions
Original Die Size
Die Size at Operating Temperature
Internal Casting Stresses
Casting Shrinkage During Quench
Summary

Chapter 3:  Dimensions Across Parting Line
Material Between the Die Halves
Gross Thermal Gradient of Die
Variation in Average Die Temperature
Die Locking Forces
Variation in Tie Bar Temperature
Temperature Variation Between Cover & Ejector
Variation in Injection Velocity

Chapter 4:  Dimensions Subject to Shift/Match
Die Temperature Variation and Nominal Size
Number of Cavities
Die Alignment System

Chapter 5:  Casting Warpage
Interaction With Other Dimensional Variations
Ejection Temperature
Die Temperature
Casting Section Thickness
Gating Systems

Chapter 6:  Measurement System Variation
Nature of Measurement System Variation
Calculating Measurement System Variation
Interpreting Measurement System Variation
Factors Affecting Measurement System Variation
Measurement System Variation in the Die Casting Plant

Chapter 7:  Summary

Appendix
References