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Laser drilling method and drilling assembly for producing shaped holes

A laser drilling and hole technology, applied in laser welding equipment, turbines, manufacturing tools, etc., can solve time-consuming problems

Active Publication Date: 2016-06-08
IPG PHOTONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like percussion drilling, this method is time consuming, which is especially undesirable when thousands of cooling holes are placed in the surface of components such as aircraft turbines, combustors, airfoils, etc.

Method used

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  • Laser drilling method and drilling assembly for producing shaped holes
  • Laser drilling method and drilling assembly for producing shaped holes
  • Laser drilling method and drilling assembly for producing shaped holes

Examples

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Comparison scheme
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Embodiment Construction

[0026] The following detailed description of the present disclosure is exemplary in nature and is not intended to limit the disclosed subject matter or the application and uses of the disclosed subject matter.

[0027] refer to figure 1 The drilling assembly 10 includes a high power fiber laser system 12 that generates an output signal light that is coupled into a passive optical fiber 14 that guides the signal light along a path toward a collimator 16 . The collimated beams are further directed through spaced mirrors 18 , 20 and 22 , respectively, to be incident on focusing lens 24 . The focusing lens 24 causes the light beam to be incident on the surface 28 of the workpiece 26 at an angle relative to the plane in which the surface 28 lies, with a focal point F located within the volume of the workpiece.

[0028] Laser system 12 may have a variety of configurations, including, for example, a master oscillator / power amplifier ("MOPA") with one or more amplification stages (ty...

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PUM

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Abstract

A laser drilling system and process for creating shaped holes in a workpiece including: a high power fiber laser assembly including a passive optical fiber having a non-circular core region and configured to emit a plurality of lights each having a Gaussian electromagnetic distribution pulse. Each pulse is emitted at a wavelength, repetition rate, and pulse duration such that when the beam penetrates the workpiece, the near-field region of the Gaussian beam forms the diffuser portion of the shaped hole, and the far-field portion of the beam forms the metering hole portion. The diffuser portion extends between the incident surface and the waist of the Gaussian beam and has an orifice on the incident surface having a profile that substantially repeats the non-circular shape of the core region. Holes can be produced at a high repetition rate of up to 100 holes per second in a pulse shot ranging between approximately 5 milliseconds and 15 milliseconds.

Description

technical field [0001] The present disclosure relates to processes and systems for the mass production of shaped holes in workpieces, and more particularly, to an improved method of forming shaped cooling holes by fiber laser machining of metal components. Background technique [0002] Proper design of cooling components with shaped holes, when properly implemented, results in more efficient and cost-effective airfoils, turbine engines, etc. components. Reasons for particular interest in laser processing are its speed relative to competing methods and its ability to form holes in components with thermal barrier coatings (TBC). As a result, drilling to form cooling holes has become standard practice in the manufacture of components such as modern jet engines. [0003] The shaped hole is configured with a diffuser and a metering section. The diffuser (the downstream portion of the hole along the path of the gaseous medium) is the non-circular portion that contains the "shape...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/382B23K26/064
CPCB23K26/389B23K26/046B23K26/0648B23K2101/001B23K26/0622B23K26/38
Inventor 威廉·什叶纳史蒂文·梅纳德
Owner IPG PHOTONICS CORP