Home
Back
Clamping Force Formula:
| From: | To: |
Clamping force is the force required to keep the mold closed during the injection process. It prevents the mold from opening due to the high pressure of the injected material, ensuring proper part formation and quality.
The calculator uses the clamping force formula:
Where:
Explanation: The formula calculates the minimum clamping force needed to counteract the injection pressure acting on the projected area of the mold cavity.
Details: Proper clamping force calculation is essential for preventing flash (material leakage), ensuring part dimensional accuracy, and maintaining mold integrity. Insufficient force can lead to defective parts, while excessive force may damage the mold or machine.
Tips: Enter projected area in cm² and maximum pressure in bar. Both values must be positive numbers. The result will be displayed in tons.
Q1: What is projected area in injection molding?
A: Projected area is the total surface area of the part (including runners) as seen from the direction of mold opening, measured in the parting plane.
Q2: How do I determine the maximum injection pressure?
A: Maximum injection pressure depends on material properties, part design, and machine capabilities. Typical values range from 500-1500 bar for most thermoplastics.
Q3: What is a safe clamping force margin?
A: It's recommended to use a safety factor of 1.2-1.5 times the calculated force to account for material variations and process fluctuations.
Q4: Can this calculator be used for all materials?
A: While the basic formula applies to all materials, different materials may require different pressure settings due to varying viscosity and flow characteristics.
Q5: How does part thickness affect clamping force?
A: Thicker parts generally require longer injection times and may need higher clamping forces to prevent flash, especially with high-flow materials.