MMT Blog

Runner sizing is a very important decision for a moldmaker, according to VISI by Vero Software. In hot runners, the moldmaker may seek to minimize the runner diameters in order to reduce melt residence time, reduce color change cycles or allow tighter pitch for drops. In cold runner molds, smaller runners mean lower material wastage. However, smaller runners in hot and cold runner molds may lead to excessive pressure drop. Very thick cold runners also may lead to an undesirable increase in cooling time.

Pressure drop of a tool depends on many factors such as runner geometry, plastic material, melt temperature, injection velocity, part geometry, etc. Once the runners are machined, it may prove to be very expensive and sometimes impossible to change these factors to reduce the pressure drop. In hot runner molds it is often required to select the product line. If the wrong product line is selected, the consequences could be catastrophic and may require manufacturing a brand-new expensive hot runner system.

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By: Christina M. Fuges 20. September 2017

Learn Additive

The Additive Manufacturing Conference (AMC) 2017, presented by Additive Manufacturing Magazine, is a three-day event in Knoxville, Tennessee, October 10-12, offering attendees unique ways to connect with leading suppliers, end-users and researchers of industrial applications of additive manufacturing technologies. 

The AMC program includes technical sessions examining design, material, machinery and applications technology used in metal additive manufacturing. Specific topics include robotic 3D printing, process control, hybrid CNC machines, laser deposition technology, large format printing, and much more.

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By: Karen Cornelissen 19. September 2017

Technology Tuesday: Products Featured at Fakuma 2017

What: Fakuma 2017

Where: Friedrichshafen Exhibition Centre, Neue Messe 1, 88046 Friedrichshafen, Germany

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There is always an opportunity to learn and see and share when attending events like the Makino Die/Mold Expo in Auburn Hills, Michigan. I asked a few moldmakers I met there to share their personal takeaways from the event and here’s what they told me:

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mmt-090117-openmind-fiveaxismoldfinishing

Injection molds are known for tight tolerances, intricate features and complex geometries including a large number of planes and connecting faces such as fillets. At the same time, requirements on surface quality are extremely high. According to Peter Brambs, Principal Engineer of Innovation at CAD/CAM company Open Mind, conventional milling strategies using ball nose cutters or bullnose end mills produce excellent surface finishes, but are not very efficient. In contrast, using face mills is highly productive, but does not lead to the desired surface quality. In my interview he explains how Open Mind’s five-axis tangent plane machining strategy can achieve time savings of up to 90 percent.

Open Mind has spent a lot of time on developing a highly-efficient method for finishing planes. Why?

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