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Lesson 15: Dimensional Challenges, Part 3

Producing defect-free high-quality parts that meet visual and dimensional requirements is essential in the injection molding industry. Many common molded parts such as syringes, gears, and cups are round by design. Others have round design features such as bosses, through-holes, and seal grooves. This lesson focuses on achieving dimensional requirements when designing and molding round parts and round features.

Topics covered in this lesson include: the key factors for achieving dimensional roundness of a molded part; how wall thickness and gating can affect volumetric shrinkages, resulting in roundness and dimensional differences; and the importance of polymers and gating on fiber orientations and resulting dimensions.

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Dimensional Challenges

Learn about the causes of common molding defects and how to prevent them. Continue to build your own Circle of Knowledge lesson by lesson. 

Goals of Molding Defects (Level 2): 

  • Learn about the various molding defects that can occur during the injection molding process
  • Gain an understanding of how part design, mold design, and process impact molding defects

Section Description: 

Molding defects in injection-molded parts range from minor surface defects to major structural issues that significantly impact overall part quality. This section shows you common molding defects, how and why the occur, and ways to minimize or prevent them.

NEW FOR LEVEL 2 MOLDING DEFECTS LESSONS: Each lesson has multiple samples of the molding defect using interactive 3D parts. The examples allow the user to manipulate the simulated part to gain a clear and concise understanding of how each molding defect would appear on a real-life injection molded part.

Video explanations, interactive 3D molding defect examples, simulations, and cause and effect analyses are covered in this section.

Recommended For: Mid-Level Personnel, All Personnel

Length: Lessons are approximately 15-20 minutes long each
