Q. How to calculate injection mold size?
A.The process of mold size calculation begins with the part's projected shut off area measurement. A machinist needs to find the surface that sits at right angles to machine platens. The next step includes multiplying this measurement by the mold's cavity count. After these calculations, the general practice requires 2-5 tons of clamp force per square inch of projected surface. Parts of standard thickness need 3 tons per square inch but thin components demand 5 tons. The shot size stands as another factor since it shapes part quality through material breakdown from barrel residence duration. Basic formulas help determine theoretical shot amounts: The formula for theoretical injection volume reads: Diameter of screw² x 0.785 x Stroke of injection = Volume in cubic centimeters. For injection weight calculation: Volume x Material density x 0.95 (injection constant) = Weight in grams
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