As a die casting dies designer; Always need to Calculate the Clamping Force. as you know, when they Run DFM report to customer. they need to know the tonnage of the die casting machine; and the size of the die casting machine. Gate and Plunger size. also know the injection time. However, how they exactly calculate the machine tonnage for die casting parts? how they know the high pressure die casting machine tonnage through analyse the parts size? in this article, we will explain how to calculate the clamping force for die casting parts.
What is the Clamping force?
Clamping force is the force which applied to the mold by die casting machine. which is overcome the Separating force of the molten in the cavity during casting. When the Molten metal is injected into the mold cavity with high pressure and speed, so die casting machine clamping unit need provide sufficient “clamping force”to keep the mold from being opened.
Casting Pressure specific
The Casting pressure applied by plunger to push the molten metal into the die. different requirement of parts use different casting pressure. see below.
- Standard die casting parts: 600 kg/cm2
- Higher Standard die Casting parts: 600~800 kg/cm2
- Pressure-resistant die casting parts: 800 kg/cm2
Projection area
This refers to the area surrounded by the outer contour line of the shadow of the die-cast product.
Die casting Projection area include below.
- die casting parts max projection area
- Gate+ Runner Projection area
- Overflow + Slug Projection area.
Normally, (Gate+Runner+Slider+overflow+slug) projection area= 2 times die casting pats projection area.
Clamping force Formula
Till now, we already understand the casting pressure and projection area, then, we will easy to get the die casting machine tonnage by below formula.
F= Casting Pressure* Projection area
Example
Here below lets run a example to run the formula to calculate die casting machine tonnage.
Product Basic Info
Part Dimension: 100*120*32mm Material : ADC12
Wall Thickness: 5mm Shrinkage: 1.005
hence, we can get below info.
Part projection area= 100*120/100=120 cm2
Casting Pressure: 800 kg/cm2
Clamping force=800*120*2/1000=192 ton
Above all, we can know we need around 192 ton clamping force to produce this parts. means we can use 200 ton die casting machine.
Conclusion
that is not too difficult, right? will be easier if you know the principle; here it is. we are professional die casting supplier, Main offer aluminium, zinc and magnesium alloy die casting, also multi-slider die casting. please contact us if you have die casting project need to develop.