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    Thermwood Adds Thermographic Imaging to its Additive Manufacturing Machines

    Image courtesy of Thermwood

     

    Dale, IN – November 29 2016: — Thermwood has added thermographic imaging as a standard feature on its LSAM (Large Scale Additive Manufacturing) systems. This addition makes it easier to adjust and control the printing process, resulting in the best possible printed structures.

    In order to print high quality, void free large scale 3D printed structures, the previous layer must be cool enough to support the new layer without distorting, but must also be warm enough to fuse completely with the new layer as it is applied. To accomplish this you must first know and then be able to control the temperature of the print surface throughout the printing process. There is a narrow range of temperatures for each material where 3D printing is optimal. The goal is to continuously operate within that range.

    Photo courtesy of Thermwood Corporation
    Photo courtesy of Thermwood Corporation

    Thermwood’s new thermographic imaging system shows the operator a full color thermal image of the part as it is being printed. With Thermwood’s system, a green color, is assigned to the ideal range of temperatures for the material being printed. The thermal image is displayed on the control screen in a movable, resizable window. The goal is to continuously print on green.

    Once print temperatures are known and the ideal print temperature can be identified, Thermwood’s print head control makes it easy to adjust printing parameters to achieve the ideal print surface temperature. If the part becomes too hot, fan cooling can be increased or print speed can be reduced, to allow more cooling time between layers. If the part temperature becomes too cool, print speed can be increased or cooling reduced.

    Photo courtesy of Thermwood Corporation
    Photo courtesy of Thermwood Corporation

    Thermwood’s high output print heads are also important to quality printing of large parts. In the past, trying to print large parts with low output print heads presented a different thermal problem. Slow print speeds prevented the print head from returning to a point before it became too cool to achieve a proper layer to layer bond. With Thermwood’s high output print heads (the largest prints up to 500 lbs/hr) this is no longer a problem. Really good quality large thermoplastic composite parts can be made. The new thermographic imaging system provides temperature guidance which helps the operator to consistently achieve optimum results.

    The thermographic camera can be mounted in three different locations. The first is a fixed position on a stand, inside the machine, looking at the part. The second mounting position is on the print gantry. This works well for parts that are too large to view as a single image. The camera can also be mounted to the print head itself, for special applications. Image output from the camera is integrated with Thermwood’s print gantry CNC control and the full color temperature image is displayed on a resizable window right on the control display itself. A touch screen allows the operator to touch any point on the image and read the exact temperature of that point.

    Photo courtesy of Thermwood Corporation
    Photo courtesy of Thermwood Corporation

    Using this technology, Thermwood has been able to produce large tools that are solid and void free enough to maintain vacuum without sealing or surface coating. This simplifies production of the tool, allowing accurate machining of the surface without having to deal with distortions that might be caused by variations in the thickness of a coating.

    Thermwood offers a line of dual gantry additive manufacturing machines which both print and trim parts on the same machine. These machines can be up to 100 feet long with print head output rates from 150 to 500 pounds per hour.

    For additional information:
    Thermwood Corporation
    904 Buffaloville Rd.
    Dale, IN  47523
    800-533-6901
    [email protected]
    www.thermwood.com

    Source: Thermwood

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    Filed Under: News Tagged With: large-scale additive manufacturing, LSAM, Thermwood

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