×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Aluminum mold for small HDPE prototype part

Aluminum mold for small HDPE prototype part

Aluminum mold for small HDPE prototype part

(OP)
I am new to the world of polymer prototyping and mold making, so any assistance to the following is much appreciated.

I am tasked with making a small number of HDPE components for an end-use of corrosion protection to a small steel structural component.

I have machined an aluminum mold (2 piece mold) and I have a polymer injection machine and HDPE to make the components. The part is relatively small and is an annular disc of 2" dia, 1/8" thick, with 5/8" dia central hole, as follows:



The 6061 alum mold I made is 3" diameter, and each half is 3/8" in thickness, with a machined recess of 1/16" to each half to create the 1/8" component thickness, complete with injection port, and also internal alignment holes/pins.

So my questions are:

1. Do I need to use a release agent applied to the alum mold, and if so, are there any preferred/recommended types?

2. Should I plan on pre-heating the mold or possibly using a mold band heater?

Thanks in advance.

RE: Aluminum mold for small HDPE prototype part

Why not buy a sheet of HDPE from e.g. C S Hyde (online and their products are on Amazon) and stamp out the rings? It would be a lot cheaper for a small number of parts.

Dr. Chris DeArmitt
President

Expert plastic materials help
www.phantomplastics.com

RE: Aluminum mold for small HDPE prototype part

The answer to your questions are both no, but the advice given above will be worth heeding...

Can't quite see why both tool halves are machined? A toolmaker would have put a 1/8 deep impression in the moving half and kept the fixed half flat. Alignment becomes much less critical then. (This also ensures part stays on the moving half when tool opens).

Personally, I would get them water jet cut rather than stamping as it will give better edges, and will not require any tooling. Machining sounds promising, but I have no experience of how HDPE machines.

H

www.tynevalleyplastics.co.uk

It's ok to soar like an eagle, but weasels don't get sucked into jet engines.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources

White Paper - Effects of AIA Quick Guide to UL 489 or UL 1077
The function of a circuit breaker is to provide overload (thermal) and short-circuit (magnetic) protection to a circuit and its downstream components. A circuit breaker functions like an airbag in a car, protecting circuit components and people by tripping the circuit to interrupt the current flow if it detects a fault condition in the control system. Download Now
White Paper - Guide to Integrate Large-Format Additive
As with any new technology, getting into large-format 3D printing begins with investigation. The first question may be a simple one: what does “large-format” mean? For 3D printers, “large” is a relative term. Many extrusion-based (FFF) 3D printers are referred to as desktop machines, because they fit on table space. Some of these have very respectable build volumes – but when it comes to “large-format,” the machines will need their own dedicated floor space. Large-format 3D printers have significant build volumes and are most often found in professional settings, like manufacturing facilities and R&D centers. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close