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Posts Tagged ‘Process’

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Question by Gonzalo: What is the function of the ejector pins in the injection moulding process?
It is for Design and Technology! help! im almost failing!

Best answer:

Answer by Tim C
The pins push the finished part out of the opened mold.

What do you think? Answer below!

Question by Gonzalo: What is the function of the ejector pins in the injection moulding process?
It is for Design and Technology! help! im almost failing!

Best answer:

Answer by Tim C
The pins push the finished part out of the opened mold.

Give your answer to this question below!

Question by Opj: What are the environmental effects of the Injection Moulding Process?
Its the process used to make plastic products.They can be negative or positive effects

Best answer:

Answer by Richard
There are very few if any Environmental effect due directly to the injection molding process. Injection molding is a manufacturing process for producing parts from both thermoplastic and thermosetting plastic materials. Material is fed into a heated barrel, mixed, and forced into a mold cavity where it cools and hardens to the configuration of the mold cavity. After a product is designed, usually by an industrial designer or an engineer, molds are made by a moldmaker (or toolmaker) from metal, usually either steel or aluminum, and precision-machined to form the features of the desired part. Injection molding is widely used for manufacturing a variety of parts, from the smallest component to entire body panels of cars.

http://en.wikipedia.org/wiki/Injection_molding

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Question by Janet M: What are some example products of the injection moulding process?
Need some examples of products made by injection moulding.

Best answer:

Answer by Jason
STEROIDS!!!!

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Question by Zed: How to limit or reduce residual stress in injection moulding process?
Just try to limit the birefringence of polycarbonate that occured during the moulding process.

The main cause is the residual stress in the course of moulding, So how do I reduce this? Any idea?

Best answer:

Answer by a.gash
Thixomolded parts are said to exhibit mechanical properties equivalent to or better than die casting , with half the porosity , and tighter part tolerances leading to reduced shrinkage , reduced residual stress and less component distortion. No foundry is required , there is no molten metal handling with its associated losses from flux , sludge or dross , and the process eliminates the use of sulphur hexafluoride , a suspected greenhouse gas which is used in magnesium foundries .
http://www.polymer-age.co.uk/archive2.htm

These residual stresses are mainly frozen in thermal stresses due to inhomogeneous cooling , when surface layers stiffen sooner than the core region as in free quenching. Additional factors in injection molding are the effects of melt pressure history and mechanical restraints of the mold .
http://www.mmpc.mcgill.ca/page4.html

What do you think? Answer below!

Question by Will: What is the typical time for a mold to open/close in an injection molding process?
The mold is relatively small. It is only a 3 or 4 inch cube. Even a rough estimate will be fine. I’m looking for the time it takes the mold to open. And the time it would take to eject a simple part would be great too. I’m assuming it’s only a couple seconds but any help would be much appreciated. Thanks!
I don’t have the machine. This is for a school project.
I don’t have an injection molding machine. This is for a school project.

Best answer:

Answer by Sexy Homer is back!
Why not just power it up and time it for yourself?

The specifications sheet that came with the device should tell you.

Know better? Leave your own answer in the comments!

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Reaction Injection Molded Polyurethane process as preformed at Armstrong Mold in East Syracuse, NY www.armstrongmold.com

This program shows participants how to quickly and effectively establish an injection molding process. Important safety issues associated with process set-up are stressed throughout the course. This program will also help molders reduce set-up and cycle times. Material preparation, drying and mixing Screw and barrel cleaning Guidelines for setting each processing parameter Procedures for proper injection velocity profile set-up Proper clamp and part removal settings

4 Elite Injection Mouders currently for sale. E25, E50 (x2) and E110. Phone Ross at Applied Machinery for more information on 03 9706 8066, or visit www.appliedmachinery.com.au
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