The Complete Engineering Guide: Injection Molding Parts Design

Learn all you need to know about injection molding in just 20 minutes or less. Whether you are an engineer or a purchasing specialist, this guide is the ideal choice for you.​

Part 1

Concepts and Draft Angles

What is injection molding? What is injection molding draft angle?
In Part 1, I will answer these questions, introduce the fundamental concepts of injection molding, and explain how engineers handle draft angles at LVMA CNC .

Part 2

Snap-fit and Part Wall Thickness

In just 7 minutes, you can master the key principles of snap-fit ​​and wall thickness design for injection-molded parts.
In Part 2, I will walk you through recommended wall thicknesses for various materials and the key considerations for reserving clearance in snap-fit designs.

Part 3

Avoid Acute Angles

Acute angles in a mold can impede the flow of molten plastic, resulting in incomplete filling. Furthermore, acute angles constitute weak points within the mold structure.
In this part, you will learn about the detrimental effects associated with the design of acute angles in molds. We will also present design recommendations for addressing these acute angles.

Part 4

Structural Strength

The structural integrity of injection-molded parts is enhanced by optimizing cross-sectional profiles and incorporating reinforcing ribs. A lack of strength optimization may render these parts susceptible to cracking or breakage.

Part 5

Reduce Cosmetic Defects

Eliminate surface defects in injection-molded parts, ensuring your products look aesthetically pleasing and neat.
In this part, you will learn how to minimize part sink marks and design gate locations. A blemish-free appearance will make your parts more competitive.

Part 6

Reduce Cost

Learn more about what affects the costs in Injection Molding. Optimize the cost structure—particularly regarding tolerances, mold design, and part design—to minimize the cost of small components, thereby ensuring the project is adequately budgeted.