Robert Beard, P.E., Honored Fellow SPE

Know Your Mold-Building Terminology

By: Robert Beard, P.E., Honored Fellow SPE 12. August 2013 21:53

For many years I held a seminar called Purchasing & Quoting of Plastic Parts aimed at OEM purchasing and molding personnel.  Attendance has waned during the recession, but the need for knowledge is still there, especially where conformal-cooled molds are concerned. 

I have seen many purchase orders over the years worded only  “Build a 4-cavity mold to produce ABC,” and nothing else. So it continues with conformal-cooled molds:  “Build a 4 cavity conformal cooled mold to produce ABC”.  People who purchase conformal-cooled molds need to understand the technology so that they know how to specify a conformal-mold in a P.O.

So what questions should OEMS or injection molders be asking their moldmaker? My list:

1. Who is designing the mold?  

2. What analyses will be done?  (You’re paying for these; put it in the P.O.)

3. How much experience do they have with each of the software packages?

4. Who is building the conformal inserts and what are they responsible for?

5. Who has the responsibility for the whole mold?

You have to have an understanding of the technology in order to write a good P.O., whether you are an OEM or a molder.

About the Author

Robert A. Beard is president of Robert A. Beard & Associates, Inc. which was formed in 1984. He has more than 40 years of experience in plastics. He presents seminars nationally and internationally entitled: Purchasing & Quoting of Plastic Parts, and Virtual Workshop On Trouble Shooting The Injection Molding Process. He has been elected to the prestigious grade of Fellow and is a Honored Service Member in the Society of Plastics Engineers, and has served as the Chairman of the Fellows Selection Committee. Contact: (262) 658-1778; email: rabeard@plastic-solvers.com; website: plastic-solvers.com

Busting the Conformal Cooling Myths

By: Robert Beard, P.E., Honored Fellow SPE 8. August 2013 16:43

Conformal cooling is opening up new ways of doing things with new tools to solve problems. As cooling lines get smaller and closer to the core and cavity wall, and take a torturous path through the mold, the hydraulic resistance is increasing for each channel. There is a myth, at the floor level, that if the main water inlet to the mold is connected to say a 12-port manifold, that the manifold splits the water into 12 equal parts. This is not true. Hydraulic resistance determines that. The higher the hydraulic resistance is in each channel, the less water that goes into the channel.

In a conformal mold, it is important to measure the flow rate of each cooling line and calculate the Reynolds number to see that it is above 5000 for turbulent flow. This can be done by installing a flow meter with a metering valve on each cooling line on the return manifold so that each cooling line can be manually balanced.

If we continue to do what we have always done, we deserve to get what we’ve always gotten.

For more on the myths of conformal cooling, check out an upcoming new FastTrack training program on September 4th and 5th, near Toledo, OH, sponsored by Plastic Technologies, Inc. (PTI), which will feature two modules— Conformal Cooling for Injection Molding (September 4th) and Medical Plastics Design and Processing (September 5th).

Conformal Cooling Seminar Outline


1.) Understanding heat management

2.) How resin selection affects heat management.
How resins can be modified to cycle faster.

3.) Choosing the right mold metal.

4.) Understanding how Fluid Dynamics impacts Dynamic Heat Transfer.

5.) Alternative cooling technologies to be used with conformal cooling.

6.) Conforming Cooling Technologies, including a European technology
presentation not seen in North America.

7.) Examples why Moldflow and Computational Fluid Dynamics (CFD) are important,
if not necessary, tools for designing conformal cooling channels

 

_______________________________________________________________________________________

About the Author

 

Robert A. Beard is president of Robert A. Beard & Associates, Inc. which was formed in 1984.  He has more than 40 years of experience in plastics. He has been president of the Chicago and Philadelphia sections of the Society of Plastics Engineers, and has served as National Councilman for the Chicago Section.  He presents seminars nationally and internationally entitled: Purchasing & Quoting of Plastic Parts, and Virtual Workshop On Trouble Shooting The Injection Molding Process.  He has been elected to the prestigious grade of Fellow and is a Honored Service Member in the Society of Plastics Engineers, and has served as the Chairman of the Fellows Selection Committee. Contact: (262) 658-1778; email: rabeard@plastic-solvers.com; website: plastic-solvers.com




« Prev | | Next »

RSS RSS  |  Atom Atom



twitter

All rights reserved. Copyright © Gardner Business Media, Inc. 2014 Cincinnati, Ohio 45244