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Computed Tomography (CT) data-analysis software analyses additively manufactured molds

By Leslie Langnau | August 13, 2019

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Volume Graphics, a provider of industrial CT software, announced its involvement with the Kunststoff-Institut in a second joint project on “Rapid Tooling” with companies from a range of industries.

“Working on this project with Kunststoff-Institut and partners is important to us,” explains Christof Reinhart, CEO of Volume Graphics, “because we are convinced that industrial computed tomography can advance the future of rapid tooling. We have been following the topic of additive manufacturing in general and rapid tooling in particular for some time now and are working on solutions to increase prototype volumes, speed of design and overall part-and-process quality.”

Additive manufacturing’s growing role in rapid tooling
In tool and mold making, additive manufacturing (AM, aka 3D printing) is playing an increasingly important role in the quality and economics of high-efficiency metal production tooling with conformal cooling channels, and rapid prototyping of sample parts and plastic mold inserts. Mold inserts are a focus of the Consortium’s second project because of their critical importance in strengthening parts and encapsulating fabricated components.

The development phase of creating injection molded parts and inserts often requires the production of small-quantity prototypes. Two common approaches are the modeling of sample “presentation” components using a low-end rapid process and using an aluminum molding tool, where the final part in the prototype production process is completed with an injection molding machine.

However, a new “rapid” method offers improved time and cost savings over aluminum: plastic molds—produced through industrial AM—that are used for prototyping traditional plastic components with inserts. While the sample output is lower in plastic molds than in aluminum, plastic is proving more than sufficient for prototypes and is less expensive than metal.

CT data-analysis software: a deeper dive into inspection and correction
Industrial CT has been an indispensable technology in tool and mold inspection for years, allowing non-destructive testing of manufactured components. Volume Graphics’ software provides a deeper look into CT results revealing flaws that may be invisible to the naked eye, comparing as-manufactured parts to their original designs and simulating the performance of part geometries to guide design and manufacturing corrections. Comparisons between CT and CAD datasets reduce molding-tool corrections for defects and warpage to a minimum.

Comparison of manufactured mold-insert part with nominal geometry in Volume Graphics’ software.

 

Manufacturing geometry correction module from Volume Graphics adjusts design of mold-insert surfaces to compensate for warpage in the additively manufactured mold prototype.

The latest versions of Volume Graphics’ CT analysis software packages VGSTUDIO MAX and VGMETROLOGY provide a Manufacturing Geometry Correction module, which has been specifically developed for tool and mold making and additive manufacturing. Part shrinkage, distortion or other dimensional deviations detected in the CT data set can be transferred to the CAD model of the tool to analyze and redesign the relevant contour so that it 3D-prints correctly.

Volume Graphics
www.volumegraphics.com

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