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  • 1980-1984  (2)
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  • 1
    facet.materialart.
    Unknown
    Precision heat forming of tetrafluoroethylene tubing (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An invention that provides a method of altering the size of tetrafluoroethylene tubing which is only available in limited combination of wall thicknesses and diameter are discussed. The method includes the steps of sliding the tetrafluoroethylene tubing onto an aluminum mandrel and clamping the ends of the tubing to the mandrel by means of clamps. The tetrafluorethylene tubing and mandrel are then placed in a supporting coil which with the mandrel and tetrafluorethylene tubing are then positioned in a insulated steel pipe which is normally covered with a fiber glass insulator to smooth out temperature distribution therein. The entire structure is then placed in an event which heats the tetrafluorethylene tubing which is then shrunk by the heat to the outer dimension of the aluminum mandrel. After cooling the aluminum mandrel is removed from the newly sized tetrafluorethylene tubing by a conventional chemical milling process.
    Keywords: MECHANICAL ENGINEERING
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Shrinking plastic tubing and nonstandard diameters (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Process allows larger-than-normal postshrink diameters without splitting. Tetrafluoroethylene tubing on mandrel is supported within hot steel pipe by several small diameter coil sections. Rising temperature of mandrel is measured via thermocouple so assembly can be removed without overshrinking (and splitting) of tubing.
    Keywords: FABRICATION TECHNOLOGY
    Type: MSC-18430 , NASA Tech Briefs (ISSN 0145-319X); 5; 2; P. 237
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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