armoloy treatment of die casting die surfaces to retard heat checking - disadvantages of die casting

by:Hanway     2019-08-31
armoloy treatment of die casting die surfaces to retard heat checking  -  disadvantages of die casting
Through the Armoloy process, the life of the aluminum-magnesium die casting mold can be greatly extended.
This has been demonstrated using the Armoloy coating on the mold, especially those that are affected by the heating inspection.
When Armoloy treatment is applied early in the life of the mold, the number of castings manufactured by the mold can be increased and more profits can be generated.
Hot inspection is a common cause of failure in steel die casting molds (I. e. : H-13)
This is usually caused by the thermal fatigue overstress of the steel used.
This thermal fatigue is caused by alternating heating and cooling of the steel mold surface and by continuous thermal shock caused during the introduction of molten die casting materials.
Pretreatment of the mold with Armoly process increases the strength of the steel and helps to overcome the damage that has been caused.
This process does not completely eliminate the heat check, but it does reduce the severity of the existing damage and keep it in the check, so further heat checks will continue at a lower rate.
A successful die casting process requires the removal of the heat generated from the molten metal to produce a solidified casting.
Therefore, the heat energy must be transferred to the die steel.
In order to enter the mold, the Heat must pass through the surface of the steel and heat it very quickly.
Then the surface is cold.
When this sequence is repeated continuously and quickly, the Heat Check begins very quickly.
These checks may not be visible to the naked eye for a few hours or even days, but they have already started on the die steel and can usually be found near the point where the molten metal enters the mold cavity.
As they grow longer and deeper into the steel surface, the inspection will increase the number of cross-connected cracks formed, many times perpendicular to the original Streamline.
The mold and the casting produced are getting worse and worse until the mold has to be reworked with the casting.
Both operations are expensive and time consuming.
All thermal checks are accompanied by cracks or air erosion on the surface of the mold into the steel.
Another obvious feature is that these cavities are usually first discovered near the source of the metal flow and in the same direction along the metal flow.
The fast-moving flow cuts a groove on the hard rock in the direction of the flow.
It is logical to assume that the molten metal will have a similar effect on the die steel.
The most logical solution may be to fill these cracks with solid materials that are not easily washed away.
This "crack filling" can and is being done with an Armoloy coating.
The processing time of die casting mold is the best.
The most logical time is that the cracks are deep enough and need to be filled, but not deep enough to be fully filled.
The Armoloy process is a process for rapid application, which is most successfully applied to new cavities after the prototype sample runs.
For older molds, however, the standard Armoloy procedure for treatment is as follows.
When the mold is removed from the machine, the mold is taken out and cleaned because all aluminum/magnesium particles pollute the surface of the mold.
This pollution is not good for Armoloy process materials.
Excess lubricants must be removed and the cavity must be completely removed.
In the event of proper planning and coordination with Armoloy, the Armoloy treatment facility is typically lost less than two days.
Your experience and knowledge will tell you how many guns you have to run before amoloy withdraws.
By keeping the marked castings from each day of production to a visual reference, a good guide for use is provided. (
In order to help you make Armoloy re-treatment decisions, the following points should be considered. )
After the Armoloy coating, the casting finish is better because the cracks have been filled by creating a smoother finish and appearance for the casting.
Threads, cracks, and tool marks are all smooth and the mold surface can now produce castings with a finish of up to 8rM. S. when required.
After Armoloy treatment, the Heat Check was greatly reduced but not completely removed.
However, it is worth noting that the usual quick heat check almost stopped for a period of time after the Armoloy coating.
After Armoloy treatment, the thermal inspection can still be seen on the casting and may not be completely eliminated.
Later, when checking the progress, its speed was greatly reduced.
Before additional Armoloy re-treatment, especially in areas of severe examination, mold prints should always be made of stone and/or polished.
Since the existing Armoloy chromium coating can't throw stones completely from the surface of the mold, this behavior may seem silly.
However, the edge of the thermal inspection crack will be smoothed to give a more uniform surface, or at least one surface that is smoother than before Armoloy retreated.
This approach will help to ensure good re-treatment of the Armoloy coating over and over again.
In many cases, the flow of materials will be enhanced after applying the Armoloy coating.
72 Rc Armoloy surface is resistant to adhesion and material build-up, ready for a cleaner mold environment.
Please keep this in mind when you consider Armoloy.
In addition, this 72 Rc Hardness will enhance the parting line edge, helping to reduce or eliminate flicker.
Since the Armoloy coating does not peel off, crack or chip, the surface integrity of the Armoloy coating on the mold surface is absolute.
When it is required to reapply Armoloy, it is absolutely important that you prepare, clean, Weld and repair the die steel to the best condition to ensure that the Armoloy coating performs its many advantages
Needless to say, profits can be increased by reducing the cost of recycled castings and increasing the life of the mold.
It should be taken into account that they need more individual treatment when producing hot-spot castings.
The cost of Armoloy treatment is very reasonable and is a good choice for all mold casters to consider when reducing these operations.
Please contact us at Armoloy to work with you to help extend die life and produce die casting products with better quality.
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