The image above represents rated static head (in bottom gating). To calculate, two essential parameters are needed and these parameters are Height of the Sprue from its Top to the Point of Metal Entry into the Mould Cavity (H) and Height of the Casting (C).
The formula for calculating rated static head (in bottom gating)
Hs = H – C / 2
Where:
Hs = Rated Static Head (in Bottom Gating)
H = Height of the Sprue from its Top to the Point of Metal Entry into the Mould Cavity
C = Height of Casting
Let’s solve an example;
Find the rated static head (in bottom gating) when the height of the sprue from its top to the point of metal entry into the mould cavity is 11 and the height of casting is 8.
This implies that;
H = Height of the Sprue from its Top to the Point of Metal Entry into the Mould Cavity = 11
C = Height of Casting = 8
Hs = H – C / 2
So, Hs = 11 – 8 / 2
Hs = 11 – 4
Hs = 7
Therefore, the rated static head (in bottom gating) is 7 m.
Read more:Â How to Calculate and Solve for Rated Static Head (in Top Gating) | Design of Gating System
Calculating the Height of the Sprue from its Top to the Point of Metal Entry into the Mould Cavity when the Rated Static Head and the Height of Casting are Given
H = Hs +Â CÂ /Â 2
Where;
H = Height of the Sprue from its Top to the Point of Metal Entry into the Mould Cavity
Hs = Rated Static Head (in Bottom Gating)
C = Height of Casting
Let’s solve an example;
Find the height of the sprue from its top to the point of metal entry into the mould cavity when the rated static head is 22 and the height of casting is 8.
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This implies that;
Hs = 22
C = Height of Casting = 8
H = Hs +Â CÂ /Â 2
That is, H = 22 + 8Â /Â 2
H = 22 +Â 4
H = 26
Therefore, the height of the sprue from its top to the point of metal entry into the mould cavity is 26 m.
Read more:Â How to Calculate and Solve for Rated Static Head (for Gating at Mould Parting) | Design of Gating System
Calculating the Height of Casting when the Rated Static Head and the Height of the Sprue from its Top to the Point of Metal Entry into the Mould Cavity are Given
c = – (Hs – H) 2
Where;
C = Height of Casting
Hs = Rated Static Head (in Bottom Gating)
H = Height of the Sprue from its Top to the Point of Metal Entry into the Mould Cavity
Let’s solve an example;
Find the height of casting when the rated static head is 40 and the height of the sprue from its top of the point of metal entry into the mould cavity is 24.
This implies that;
Hs = 40
H = 24
c = – (Hs – H) 2
Then, c = – (40 – 24) 2
c = – (16) 2
c = – 32
Therefore, the height of casting is – 32 m.
How to Calculate Rated Static Head in Bottom Gating Using Nickzom Calculator
Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the rated static head (in bottom gating).
To get the answer and workings using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.
You can get this app via any of these means:
Web – https://www.nickzom.org/calculator-plus
To get access to the professional version via web, you need to register and subscribe for NGN 1,500 per annum to have utter access to all functionalities.
You can also try the demo version via https://www.nickzom.org/calculator
Android (Paid) – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator
Android (Free) – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator
Apple (Paid) – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Materials & Metallurgical under Engineering.
Now, Click on Foundry Technology under Material & Metallurgical
Then, Click on Design of Gating System under Foundry Technology
Now, Click on Rated Static Head (in bottom gating) under Design of Gating System
The screenshot below displays the page or activity to enter your values, to get the answer according to the respective parameters which are the Height of the Sprue from its Top to the Point of Metal Entry into the Mould Cavity (H) and Height of the Casting (C).
Now, enter the values appropriately and accordingly for the parameters as required by the Height of the Sprue from its Top to the Point of Metal Entry into the Mould Cavity (H) is 11Â and Height of the Casting (C) is 8.
Finally, Click on Calculate
As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the rated static head (in bottom gating) and presents the formula, workings and steps too.
Understanding these calculations is crucial for optimizing the gating system design and ensuring efficient metal flow during casting processes. Properly calculated rated static head helps maintain quality and consistency in the final castings.
Further Considerations
Furthermore, considering factors such as alloy properties and casting temperature can refine these calculations for specific casting scenarios. Advanced simulation software can also assist in predicting metal flow dynamics and optimizing gating designs. Incorporating these modern tools and techniques enhances the efficiency and accuracy of casting processes. Continuous improvement in gating system design contributes to reducing defects and enhancing overall casting quality. This iterative approach empowers foundries to achieve higher productivity and cost-effectiveness in metal casting operations.
