Amination zinc alloy pressure die castings defects are also called peeling, blistering, spalling, etc., which is another manifestation of cold shut. These are zinc alloy die castings with common defects. These lamination exist on the outer surface; inside of parts; circular arcs;near sharp corners.lamination is melton metal not completely fused with the casting blank; some of lamination is not obvious , it is the accumulation of multiple thin layers. Carefully check the casting blank, you can see the 2-7mm bright flake surface, but no peeling defects, obvious peeling or delamination defects will appear under shot peening or high temperature.
Root Cause for Lamination in zinc pressure die casting defects.
Uneven/Slow Filling
Lamination is caused by uneven filling or slow flow. When the local temperature of the mold is low, the metal entering the cavity first solidifies on the inner surface of the mold, and will not be completely fused with subsequent metal solidification, and the bonding strength with the matrix is low and weak. Under the action of external force, the surface layer is easy to peel off, causing the defect of peeling off of zinc alloy die castings.
Die Casting Die
The instantaneous impact force during die-casting is too large, or the mold is not rigid enough to cause flexural deformation. At this time, the molten aluminum will break out of the shell and form a thin layer between the product and the mold surface.
Manual Operation
The five reasons for the Lamination of zinc alloy die castings defects analyzed above are based on normal production conditions. We have a professional team and experienced operators. and fluent experience to solve these kinds of problems, or prevent these kinds of problems from coming out. contact our engineering team today and start your project.
Product Structure Limitation
Causing the local temperature of the mold to be too high. After the zinc alloy die casting is opened, there will be a “sweating” phenomenon, that is, the unsolidified Zinc melten flows out from the surface of the product. influences. Skin defects appear after external force (If the product requires air tightness, it may cause the product to leak from here)
Air-Tightness Testing
because the product requires air-tightness testing, the local area is a high-risk leakage location, so local extrusion is designed to prevent leakage, combined with the actual use of the production site, if the local extrusion design and improper use are likely to cause the product to be shot blasted peeling.
The five reasons for the Lamination of zinc alloy die castings defects analyzed above are based on normal production conditions.