Here we will mainly refer to the application of ejectors in automotive and in particular mold accessories acting as the ejector or stabilizing element. Automobile molding design ejector must follow all kinds of reasonable principles and requirements to ensure the mold is working properly and the quality of the product.

The role of ejectors in automotive molds

"Automotive molds use ejector pins to eject plastic parts so that the product can be smoothly demolded from the mold. Its functions include:

• Ejection function: In injection molding, the ejector applies pressure to the molded plastic part to eject it from the mold which ensures the finished product is complete and surface quality.

Stabilization function: In some cases, the ejector also plays the role of stabilizing the internal structure of the mold to ensure that the mold does not deform or damage under high pressure.

Design principles of ejectors

The function of the ejector arrangement is to make the ejector force as balanced as possible: The ejection force required by the complex structural parts is large, and the number of ejectors should be increased accordingly, and the force should be uniform.

At the same time, it is important to add ejectors in effective positions: such as bone positions, column positions, steps, metal inserts, local thick rubber and other complex structural locations, to provide sufficient support and demoulding force.

Do not set ejectors over steps or inclined surfaces: the surface of the ejector is used as flat as possible, avoid setting ejectors at structural locations with poor force 2

Use of flat ejectors: in case rubber parts with deeper bone positions or it is not easy to arrange round ejector, should be used flat ejector, and need to try for inserts, so as to facilitate processing.

Avoid slashing steel and thin steel: the top surface of the ejector must not contact with the surface of the front mold, so as not to damage the mold.

To use a exhaust (place the ejector where vacuum can easily be formed, demoulding smooth).

Appearance requirements: It is not allowed to arrange ejector pins on the appearance surface for rubber parts with appearance requirements, and other ejection methods must be used.

Transparent rubber parts: In the case of transparent rubber parts, the ejectors cannot be arranged in any areas that need to be transparent.

These guidelines ensure that the use of ejector pins in automotive molds is effective, leading to improved production efficiency and product quality.