Pressure Die Casting Aluminum Military Parts vs Sand Casting. The military is an important part of any nation. State of the art technology gives a country a heads up against other possibly invading or threatening army. And with the invention …
Tag Archives: Porosity
What is Die Casting Porosity? (Die Casting Porosity) In order for you to know what die casting porosity is, you need to know the die casting basics. The most common form of Die Casting Porosity is a kind of factory defect in which die cast parts contain small pockets of void space and air within the metal, causing it to become porous.
Porosity in Die Casting is the air trapped by the metal inside the die casting parts. To know more, a basic knowledge of the die casting process is necessary. Die casting is a process wherein a particular amount of molten metal is put inside a shot cylinder, then it is applied (plunged) with great force with a piston so as to force the metal into a die cast mold or die cast die. During this “plunging process”, air inside the cylinder is forced along with the metal into the die casting mold. It is a very fluid turbulent process. The air forced into the mold with the metal and the metal already inside the mold is forced out of the mold through a series of gates, vents and overflows.
After this, the metal is left to cool down and harden or freeze inside the mold. The metal is then removed as a die cast part. The same process is repeated over again.
Die casting companies use metals which are non-ferrous, or do not contain Iron, as this is the highest factor for oxidation and rusting. Several examples of non-ferrous metals include zinc, aluminum, lead, Magnesium Die Casting, tin and copper. Kinetic Die Casting only uses aluminum die casting and zinc die casting.
In the worst case, die casting parts porosity, weakens die casting parts, if the voids or pockets are very large. Porosity typically matters most in pressure tight die casting parts. When the air escapes through a die casting part, it is typically caused by porosity.
The many forms of Die Casting Porosity are caused by many variables:
- Metal and Mold Temperatures
- Material Cleanliness
- Die Cast Mold Design
- Die Cast Part Design
- Die Casting Machine Pressures
- Die Casting Machine Shot Speed
- Die Casting Spray or Mold Release
- Other forms of porosity can be from “shrinkage” or wall thickness.
Employees of Kinetic Die Casting are POROSITY EXPERTS in die casting parts that need to be free of porosity.
Contact Kinetic Die Casting today if you need “solid” die casting parts.
Kinetic Die Casting, Inc.
6918 Beck Avenue
North Hollywood, California USA 91605
Sources of Porosity in Die Castings. The formation of bubbles in the castings results to die casting porosity. Porosity in die castings in defects caused by bubbles, often resulting from machine inefficiency, temperature variances, etc.
The following enumerates the most common sources of porosity in die castings.
Once air is trapped in the castings upon pouring of metallic substance into the die and the same air was not able to escape during solidification, a metal casting defect is expected to result from it. Both the temperature and the pressure directly affect the formation of such die casting porosity.
When from a core, gas bubbles are blown into the liquefied metal, causing holes when solidified. This is also known as blisters.
Some defects in die casting are caused by oxides. Oxide formation causes defects on the surface or in the subsurface of the die cast parts. In steel castings for example, the removal of inclusion material by blasting causes associated porosity. These are the grassy areas in steel castings.
Pinholes are characterized by the formation of tiny bubbles caused by less soluble gases. During solidification, soluble gases must dissolve upon combination with liquefied metal. Once insoluble gasses remain, defects such as pinholes will appear on the castings.
Shrinkage normally occurs during solidification of liquid metal. An allowable degree of shrinkages is considered by die casting manufacturing companies. However when shrinkages goes beyond the allowable level forming a defective casting, this is considered a manufacturing cost. Die casting products are often deformed due to shrinkages in various forms.
This is the blog on the Kinetic Die Casting Company web site. KDC also writes about Porosity in Die Casting. Look at this website page for more details: www.kineticdiecasting.com/porosity.html. Contact Kinetic Die Casting Company at 818-982-9200 or email us at email@example.com. Use this webpage to request “die casting part prices” www.kineticdiecasting.com/replyform.html