Plastic Mold Design Formula Calculator-Topworks Plastic Molding

Plastic Mold Design Formula Calculator

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Mold Cavity/Core Dimensions

Part Nominal Dimension (Lp):

Plastic Shrinkage Rate (k, e.g., 0.005 for 0.5%):

Part Dimension Tolerance (Δ):

Mold Manufacturing Tolerance (δ):

Cavity Radial Dimension (Lm): —

Cavity Depth Dimension (Hm): —

Core Radial Dimension (Lc): —

Clamping Force

Mold Cavity Projected Area (Am in cm²):

Filling Pressure (Pv in kg/cm², typically 150-350):

Clamping Force (F in TON): —

Injection Pressure

Pump Pressure (P in kg/cm²):

Injection Oil Cylinder Effective Area (A in cm²):

Screw Diameter (D in cm):

Injection Pressure (Pi in kg/cm²): —

Injection Volume/Weight

Screw Diameter (D in cm):

Injection Stroke (ST in cm):

Material Specific Gravity (η):

Mechanical Efficiency (δ, typically 0.95):

Theoretical Injection Volume (V in cm³): —

Injection Weight (Vw in g): —

Cooling Time (Simplified)

This is a simplified estimation. Precise calculation involves complex thermal properties.

Part Wall Thickness (s):

Melt Temperature (Tm):

Mold Wall Temperature (Tw):

Ejection Temperature (Te):

Thermal Diffusivity (α, m²/s):

Cooling Time (tc in seconds): —

Runner Diameter (Empirical)

Part Weight (W in g):

Runner Length (L in mm):

Empirical Constant (C):

Runner Diameter (D in mm): —

Mold Plate Thickness

Based on simplified deflection model for uniformly loaded plates.

Filling Pressure (Pv in MPa or N/mm²):

Shortest Span (a in mm):

Elastic Modulus (E in MPa, Steel ~200000):

Max Deflection (δmax in mm):

Deflection Factor (k):

Required Plate Thickness (h in mm): —

Note: Typical ‘k’ values for a square plate with four simply supported edges are around 0.0443.

Plastic Mold Design Calculator