Understanding the Relationship Between Filling Pattern and Part Quality in Die Casting

Brevick, Jerald ; Miller, R. Allen

The Ohio State University (United States)

关键词: Alloys;    Cavities;    Air;    Geometry;    36 Materials Science;   

DOI  :  10.2172/822408
RP-ID  :  DOE/ID/13842
RP-ID  :  FC07-00ID13842
RP-ID  :  822408

美国|英语

来源: UNT Digital Library

【 摘 要 】

The overall objective of this research project was to investigate phenomena involved in the filling of die cavities with molten alloy in the cold chamber die-casting process. It has long been recognized that the filling pattern of molten metal entering a die cavity influences the quality of die-cast parts. Filling pattern may be described as the progression of molten metal filling the die cavity geometry as a function of time. The location, size and geometric configuration of points of metal entry (gates), as well as the geometry of the casting cavity itself, have great influence on filling patterns. Knowledge of the anticipated filling patterns in die-castings is important for designers. Locating gates to avoid undesirable flow patterns that may entrap air in the casting is critical to casting quality - as locating vents to allow air to escape from the cavity (last places to fill). Casting quality attributes that are commonly flow related are non-fills, poor surface finish, internal porosity due to trapped air, cold shuts, cold laps, flow lines, casting skin delamination (flaking), and blistering during thermal treatment.