How to Calculate Clamping Force for Injection Molding
Clamping Force Calculation for Injection Molding
Clamping force in injection molding refers to the pressure needed to hold the mold closed during the manufacturing process. Molten plastic is injected into a metal mold under pressure. The pressure is required to make sure the molten plastic reaches every part of the mold evenly. A clamp is used to keep the mold closed. The clamping force must be greater than the pressure being exerted by the molten plastic as it is injected into the mold. Clamping force calculation is a critical part of the injection molding process.
Clamping force is also known as clamping tonnage since the pressure rating is stated in tons. A 200-ton machine is capable of producing a maximum clamping force equivalent to a total of 200 tons of pressure. The calculated clamping force can be used to select a capable machine that will prevent part defects, excessive flash, burn, and short shots.
How Much Clamping Force is Required?
The required clamping force can be calculated from the cavity pressure inside the mold and the shot projected area. Certain variables must also be taken into account. These variables include material type, part surface area, and part depth.
Visit the Clamp Tonnage page of our website to learn more about clamping force calculation and how they will effect project outcomes and cost.