Keep the parting line on a flat plane whenever possible to reduce tooling costs.
Imagine trying to bake a cake and remove it from a pan with perfectly vertical, 90-degree sides. It will likely stick and tear. The same logic applies to injection molding. Why It Matters
While our focus is on part design, understanding the mold is helpful. The is where the A-side and B-side of the mold meet. Placing this line along the natural, flattest edge of your part makes the mold simpler and cheaper. Complex, steppes parting lines increase cost and the risk of flash. injection molding part design for dummiespdf exclusive
Space multiple parallel ribs at a distance of at least 2 times the main wall thickness to ensure the metal mold walls are thick enough to transfer heat away efficiently.
Redesign features to eliminate undercuts. For instance, use a through-hole or a slot in an adjacent wall to create a latch feature instead of a protruding side tab. Keep the parting line on a flat plane
Plastic flows like a liquid, and liquids don't like to go around sharp corners. A square corner in a mold creates a stress concentration , a weak point where cracks are likely to start. Additionally, sharp corners can disrupt the plastic flow, leading to cosmetic defects.
By following these fundamental guidelines, you will create parts that look professional, perform flawlessly under pressure, and pass design-for-manufacturability (DFM) reviews with flying colors. The same logic applies to injection molding
Even experienced designers can make mistakes when designing parts for injection molding. Here are some common mistakes to avoid:
Mixing Madhubani art, block prints, brass diyas, and low seating with IKEA furniture.