Angle Lifter Design Guidelines

Angle Lifter Design (Angle Lifter)

An angle lifter is a mechanism used to handle internal undercuts in molded parts. Types of angle lifters include:

1. Integral type

2. Two-piece type

3. Cavity-side angle lifter

Angle Lifter Design Guidelines:

1. Determine the angle lifter angle based on the actual stroke (H). The angle is typically between 3° and 12°, and should be as small as possible. The angle lifter's core-pulling distance should generally be 3mm greater than the product's core-pulling distance. Ensure coordination between the angle lifter's strength, its angle, and the ejection distance.

2. Determine the angle lifter width based on the width of the product's undercut feature.

3. Determine the angle lifter thickness based on its width and its location within the product (considering potential interferences and the height difference of the molded surfaces on the lifter). Thickness should generally be no less than 6.0mm.

4. Determine the design of the guide slot based on the angle lifter's size, difficulty, thickness, and total length. Guide slots are typically made from 40Cr material.

5. Design the guide block according to the angle lifter dimensions. Common materials for guide blocks include 40Cr and bronze.

6. Angle lifters must be made from H13 steel and undergo nitriding treatment.

7. Oil grooves must be machined onto the angle lifter (except on the top and bottom surfaces).

8. Pay attention to the product's orientation to avoid it hanging on the angle lifter. Add an accelerated ejector pin if necessary.

9. When drafting, the angle lifter must be represented using three views.

10. The top surface of the angle lifter should be 0.05mm below the product surface to prevent surface scuffing.

11. Consider whether the product might stick to the angle lifter and ensure there is a mechanism (e.g., a locating pin) to retain the product.

12. Check if the head of the angle lifter has reverse draft (which could cause material scraping during ejection). Always verify that the angle lifter will not interfere with other components (such as other angle lifters, ejector pins, or ribs).

13. When the product is deep and has an angle lifter on the side, add a step for positioning on the angle lifter. Another scenario requiring a positioning step is when the angle lifter is located on the side of a product (which has a certain depth) and one side of the angle lifter faces a relatively deep rib.