METHODS OF ULTRASONIC DRILLING FOR FORMING PERFORATIONS IN COMPOSITE MATERIALS
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United States of America Patent
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Issued Date -
Aug 26, 2021
app pub date -
Feb 20, 2020
filing date -
Feb 20, 2020
priority date (Note) -
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Abstract
Methods of ultrasonic drilling may be used to form perforated sheets by forming holes through a workpiece using a needle or needle array operatively coupled to an ultrasonic actuator. The needle is brought to repeatedly contact the surface of the workpiece at an ultrasonic operating frequency, thereby forming the hole through the workpiece. Such steps are repeated to form a plurality of holes in the workpiece, thereby forming a perforated sheet which may be used in an acoustic liner for noise attenuation. The workpiece may be heated while the holes are formed, via a remote heating unit that locally heats a portion of the workpiece.
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