Draw Down Ratio Calculator

The Draw Down Ratio (DDR) is a critical metric used in extrusion processes to determine the relationship between the die and product dimensions. It is calculated using the following formula:

Draw Down Ratio Formula

\[ DDR = \frac{(DD/PD)}{(DT/CD)} \]

Where:

• DDR is the Draw Down Ratio.
• DD is the diameter of the extrusion die.
• PD is the diameter of the product.
• DT is the outside diameter of the tip.
• CD is the core diameter.

Example Calculation

If the die diameter is 20 mm, the product diameter is 15 mm, the tip diameter is 10 mm, and the core diameter is 5 mm, the Draw Down Ratio would be calculated as:

\[ DDR = \frac{(20/15)}{(10/5)} = \frac{1.3333}{2} = 0.6667 \]

Understanding the Draw Down Ratio helps optimize extrusion processes by ensuring that the material flow and pressure are properly controlled, leading to higher-quality products.