The beginning of the 21st century was a turning point for vacuum impregnation equipment safety, and in less than two decades there have been significant improvements in that technology, a process that had been essentially unchanged for 70 years.
The beginning of the 21st century was a turning point for vacuum impregnation equipment safety, and in less than two decades there have been significant improvements in that technology, a process that had been essentially unchanged for 70 years.
A previous blog What Size of Porosity Can Vacuum Impregnation Seal? discussed that porosity occurs naturally and that the purpose vacuum impregnation is to seal leak paths created by interconnected pores. This follow up blog discusses how to define what leak paths should be sealed.
A commonly asked question is "What size of porosity can vacuum impregnation seal?" What seems like a simple, straightforward question is actually a complicated one. This blog will address the topic by describing the basics of die casting porosity, and what vacuum impregnation will seal.
When 3D printing was first developed in the 1980’s, it was primarily used for a product’s proof of concept or initial prototypes. The limits of the technology and material did not allow one to use the process for field testing, or production. The past decade has seen a surge in 3D printing use. The rapid developments in 3D printing technology and materials has accelerated areas like product development, offer customized product, and eliminate design restrictions.
A global automotive part manufacturing company produces aluminum engine blocks, cylinder heads, and transmission cases. The company is a Tier 1 supplier to automotive OEMs, and has facilities through the world. As such it was actively looking for opportunities to increase its efficiency and output.
The term porosity is used extensively when talking about any void in a casting, but it does not describe the actual problem. It can take many different shapes and forms, but it is often described just as “porosity”. When analyzing a casting’s porosity, it is important to describe specifics like size, shape, location, and frequency. Since porosity is within the casting’s walls, the best way to analyze it is through Nondestructive Testing.
Vacuum impregnation is a process that seals porosity in metal castings. If left untreated, then the porosity creates a path for fluids and gasses to leak from the part. When performed properly, vacuum impregnation seals the porosity, but it is undetectable on the surface or in the machined features of the casting.
In order to properly seal casting porosity, parts must be clean and dry. The porosity must be free of any contaminants that might preclude the sealant from penetrating. If any residual contaminants are present, then the following problems may occur.
One of the largest aluminum casting facilities in United States produces engine blocks and transmission cases for an automotive OEM. This facility supplies the vast majority of powertrain castings in support of the OEM’s assembly operation throughout North America.
