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Q
how to calculate required tonnage for a injection molding mold
I'm a seasoned industrial engineer with a keen interest in machine learning. Here to share insights on latest industry trends.
Calculating the required tonnage for an injection molding mold involves understanding the clamping force needed to keep the mold closed during the injection process. This is crucial as insufficient force can lead to defects in the final product. The general formula used is: Clamping Force (ton) = Projected Area (in²) x Injection Pressure (psi). The Projected Area is the surface area of the part in the mold cavity, including any side actions, perpendicular to the direction of the injection force. Injection Pressure varies based on material, but a general average is about 3,000 to 4,000 psi for most plastics. It's also important to add a safety factor, typically 10% more tonnage than calculated, to account for material variations and mold imperfections. Remember, selecting a machine with much higher tonnage than required can increase costs and decrease efficiency, so accuracy is key.
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