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Five transparent calculations connect geometry, force, heat and productivity. Every result keeps its units, assumptions and source basis close.
Clamp-force estimate
Pressure acting over projected area produces a separating force. Use the projected area of all cavities and runners relevant to the parting plane. The pressure is an assumed mean cavity pressure, not the machine's hydraulic or screw-tip pressure.
Shot mass and volume
This is a mass balance followed by the definition of density. A 56 g shot at 1.04 g/cm³ occupies 53.846 cm³. Solid density gives solid volume; melt volume requires density at melt conditions.
Idealised flat-wall cooling
First-term Fourier estimate for cooling the centre of an ideal plate. BASF distinguishes this maximum-temperature form, using 4/π, from the mean-temperature form, using 8/π². Doubling thickness gives four times the estimate.
Good-parts throughput
Ideal cycles per hour become scheduled-hour output after applying uptime and quality yield. With a 30 s running cycle and four cavities, ideal output is 480 parts/h; the example produces an expected 399.84 good parts per scheduled hour.
Water-side heat removal
A steady-flow energy balance connects measured flow and temperature rise to heat carried by the water. At the stated approximations, 20 L/min and 5 °C rise carry about 6.977 kW.
Useful estimates start with good definitions.
Cavity pressure differs from hydraulic pressure. Melt density differs from solid density. A cooling-time estimate differs from the full cycle time. Treat these labs as a way to understand relationships, then validate inputs and results against the material, tooling and machine in use.
Put the calculations back into the cell