Provide flat ejector pinstep ejector pin series

Provide flat ejector pinstep ejector pin series

1. Flat ejector pin
Purpose: Used for ejecting deep and narrow ribs, ribs and other narrow areas, or in situations where a round ejector pin cannot be used due to space limitations.

Features:

The cross section is flat (commonly rectangular or D-shaped), with high bending strength, but weak lateral strength.

Anti-rotation design (such as machining planes or keyways) is usually required to prevent rotation during ejection.

Design points:

It needs to be matched with a flat ejector pin hole or a special-shaped hole processed by wire cutting.

The ejection contact area is small, and care must be taken to avoid whitening or breaking the product.

2. Step Ejector Pin
Purpose: Used in situations where there is a step on the back of the ejector position or the ejector strength needs to be enhanced (such as large-angle ejection).

Features:

The ejector is divided into multiple diameters (such as large diameter of the head and small diameter of the rod) and positioned by steps.

It can reduce the matching length between the ejector and the mold core and reduce the difficulty of processing.

Design points:

The step part needs to match the mold core to prevent plastic from flowing in.

The fillet (R angle) at the step transition needs to be marked to avoid stress concentration.

3. Support Pin/Return Pin
Purpose:

Assist the ejector plate to reset and ensure the ejection system returns to its correct position.

Support the ejector plate in large molds to prevent it from bending and deforming.

Features:

Usually cylindrical with hardened surface.

Need to be used with return spring or return rod.

Design points:

The length should be slightly longer than the ejector pin (usually 0.1~0.2mm longer) to ensure that the ejector pin resets first.

The layout should be uniform to avoid uneven force on the ejector plate.

General design considerations
Material and heat treatment:

Ejectors are commonly made of materials such as SKD61 and SUJ2, with a hardness of HRC50~55.

Flat ejectors need to pay special attention to wear resistance (titanium plating or nitriding treatment is possible).

Fitting tolerance:

The single-sided clearance between the ejector and the hole is usually 0.01~0.02mm (to prevent overflow and to slide smoothly).

Lubrication:

The ejector hole needs to be designed with an oil groove or lubricated regularly (especially for flat ejectors).

Fool-proof design:

Flat ejectors need to be marked with directions, and step ejectors need to be marked with installation depths.

Typical application examples
Flat ejectors: Narrow rib ejectors inside mobile phone housings.

Step ejectors: Ejectors in deep cavity areas of automotive parts.

Support pins: Support for ejector plates in large home appliance molds.

If more specific dimensional standards or processing details are required, further requirements can be explained (such as mold type, product materials, etc.).