Piercing processing method and laser processing machine
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United States of America Patent
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Jun 25, 2019
Grant Date -
Oct 19, 2017
app pub date -
Sep 9, 2015
filing date -
Oct 10, 2014
priority date (Note) -
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Abstract
A piercing processing method and a laser processing machine capable of carrying out a piercing processing on a thick plate in short time are provided. It is a processing method for carrying out a piercing processing on a metallic material by laser beams with wavelengths in 1 μm band, where the piercing processing is carried out by maintaining a range of 8≤Zr/d≤12 when a condensed beam diameter of the laser beams is set to be d and a Rayleigh length of the laser beams is set to be Zr. At that time, a focal position of the laser beams is set to be on a surface of a workpiece or an external of the workpiece. Then, a beam profile of the laser beams is such that the laser beams of a single mode are converted into a bowler hat shape by a beam quality tunable device.
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