×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

*
*
*
*

Thanks. We have received your request and will respond promptly.

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!
*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

Injection molding Cavity sorting

thread277-109095

Injection molding Cavity sorting

Injection molding Cavity sorting

(OP)
hello,
I currently have a project which deals with an injection molding process at work.  We are molding pairs of brackets in a 4 cavity mold.  2 of the cavities are the RH bracket and the other 2 cavities are the LH.  

Currently we have a robotic arm with 2 grippers which comes down in from the top of the mold and grabs onto the sprue to remove it place it in a regrind hopper.  The 4 parts then fall from the mold into a bin which is removed for sorting when full.  

Does anyone have any ideas on what could be adapted to the end of the gripper arm to possibly allow two of the parts to fall and the other two to be picked up by the arm and moved to a different bin?  

I am not very familiar with robotics so I am not sure what can be done.  

Thanks,
Chad

RE: Injection molding Cavity sorting

Without knowing any more about your system, I have to guess that the robot's end effector is a simple sprue gripper of some sort.  It moves into position and the position is programmable.

Possible solutions:
(1) mount suction cups with long stroke cups to the end effector, move the end effector into position to pick the parts, then do sprue picking.  Program the arm to put parts where desired.
(2) similar to (1), but mount suction cups on pneumatic slides to provide sufficient stroke to get to the part location from the sprue pick location.

TygerDawg

RE: Injection molding Cavity sorting

If this is a simple sprue picking robot, I would just use a vacuum generator and 2 vacuum cup/stem assemblies to pick 2 of the 4 parts. Let the other 2 parts fall along with the runner and seperate the runners. It should be easier to seperate the runners from the parts then it would be to seperate the lefts from the rights. Total investment would be around $100-$150. Well worth the money not only to reduce sorting time, but reduce the chance that lefts and rights will get mixed in the same box.

www.nicoletplastics.com

RE: Injection molding Cavity sorting

This is commonly done however it may depend on the safistication of your robot. I used to work with pressflow robots.  With the older models it was a little more difficult to do being that they had SLC150 running them. If you can not do the programming yourself the supplier of the robot should be able to help you. The molding machine set-up will also have to be changed to cut the spru then eject it and the brackets on to the end-of-arm.
Without knowing your specific equipment it is hard to advise you of the best approch to take.

RE: Injection molding Cavity sorting

Sounds like an easy task.
I think it'd be easier to switch things around so that the arm picks the parts out and lets the sprue fall. Then you could stage the arm to drop the LH parts in one box, and the RH in the other.

BTW, Tweeker, I worked with Nicolet a few years ago when working for Mold Engineering in Indianapolis. Were you there then? My name's David Sloop

RE: Injection molding Cavity sorting

If the parts are opposite of each other just put a diverter on the spru picker that sends two part one direction the other two the opposite. Build a separator under the molding area that send two of the parts to a different location.

Its a simple and cheap solution.

Family molds #*^&$%*%&~!

RE: Injection molding Cavity sorting

Look at some RoboHand, Festo, Parker, and other manufacturers grippers.  This might give you some ideas.  If we could see a picture of the parts in the mold, we can flood you with some ideas.

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! Already a Member? Login

Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now