Shenzhen Alu Rapid Prototype Precision Co., Ltd.

In injection molding, the number of cavities refers to the number of individual molds (or "pockets") within a single tool that can produce parts simultaneously in one cycle. A single-cavity mold produces one part per cycle, while a multi-cavity mold (e.g., 4, 8, or 16 cavities) produces multiple identical parts. Determining the optimal number balances production volume requirements, economic factors (like cost per part), and technical constraints (like machine capacity). There is no single universal formula, but the process typically involves calculating based on demand and then validating against costs and feasibility.

Below, I'll outline the primary methods, starting with the production volume-based calculation (the most common starting point), followed by economic optimization and constraints.

Step 1: Calculate Based on Production Volume (Demand-Driven Method)

Step 2: Optimize Economically (Cost-Driven Method)

How to Arrive at the Solution:

1.Estimate (K): Quote from mold makers (scales with (N); 

2.Determine (L): Based on material (aluminum:

3.Calculate for different (N) values using the formula.

4. Use production rate from Step 1 to divide fixed costs.

5.Select (N) where meets your target with diminishing returns (e.g., beyond 16 cavities, gains are minimal but risks rise).

6.Iterate: Quote multiple options and compare.

Step 3: Validate Against Technical Constraints

1.Machine Fit

2.Clamping Force

3.Runner Balance