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The Introduction Of Ejector Pin
Ejector pin are the “bouncers” of the injection molding world. they apply a force to eject a part from the mold, and in some cases can leave marks. … Once the mold is opened, the Ejector pin extend into the mold cavity, push the part out, and then retract, allowing the mold to close and be refilled.
The ejection of a plastic product is the last step in the plastic
injection molding process. The quality of the ejection determines
the quality of the plastic product. when the mold opens, the
plastic product must be retained on the mold half (usually the
core) with the ejector mechanism that is used to release the
plastic product.
1. The ejector pin layout should make the ejection force as
balanced as possible
The demolding force for complex structures is relatively large, so
the number of ejectors should be increased accordingly.
2. The ejector pin should be set in effective places
The effective places include the rib, column, step, metal insert
and other complex structures. The ejector pin on both sides of the
rib and column should be arranged symmetrically as much as
possible. In addition, try to ensure the ejector pin on both sides
of the column position.
3. Avoid arranging ejector pinon the inclined surface or
overstepping
The top surface should be as smooth as possible, and we should
arrange it in the structural part of the rubber with better force.
4. Flat ejector pin should be chosen in some cases
In the deep rib (depth ≥20mm) or it is difficult to arrange the
dome ejector pin, we should adopt flat ejector pins. When we use
it, try the insert form to facilitate processing.
5.Avoid sharp and thin steel
When layout the ejector pin, we should avoid those sharp and thin
steel. And the top surface of the ejector pin should not touch the
cavity side.
6.Consider the distance between the ejector pin and the waterway
Avoid affecting the processing and water leakage of the waterway.
7.Consider the exhaust function of the ejector pin
In order to exhaust during ejection, it should be arranged in the
part which is easy to form a vacuum. For example, in the larger
plane of the cavity, although the packing force of the rubber part
is small, it is easy to form a vacuum, which leads to an increase
in the demolding force.
8.The ejector pins cannot be placed in some places
For plastic parts with appearance requirements, it can not be in
the appearance surface, and we should adopt other ejection methods.
For transparent plastic parts, it can not be arranged in the part
that needs to transmit light.
About Us:
SENLAN Mold Part Co.,Ltd is specialized in manufacturing mold accessories which located in Guangdong, China.
Specification Of Ejector Pin:
Our Advantages:
1. Delivery On Time As Promised
2. Best Quality Material & Various Sizes.
3. Skilled Engineers & Advanced Technology
4. Prefect Quality Control System
5. Competitive Price
6. OEM, ODM And Non Standard Service
7. 24 Hours Instant Communication For The Service
FAQ:
Q1: Do You Provide Samples ? Is It Free Or Extra ?
A: Yes, we can offer you samples or raw material for your quality
inspection, but you need to bear the cost of freight. For some
products, you also need to pay for the samples.
Q2: How Can You Guarantee Quality?
A: Advanced Machine Equipment+ Mature Technology+ Skilled Workers
ensure the quality of our products. Also our QC Department will
check each piece before every shipment.
Q3: After-Sale Service
A: Contact us if you have any question after receiving the samples
or products, we'll try our best to solve the problem until you are
satisfied!
Q4: Standards
A: JIS, AISI, DIN, ISO, DME, MISUMI, PUNCH, FIBRO, HASCO, DAYTON, etc.