Numerical simulation method for selective laser repair process

A technology of laser repair and numerical simulation, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of high laser power, uneven stress distribution, fast cooling rate, etc., and achieve low analysis cost and accuracy High, labor-saving effect

Inactive Publication Date: 2018-05-15
XIAN BRIGHT ADDTIVE TECH CO LTD
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AI Technical Summary

Problems solved by technology

Although its processing efficiency and quality have been greatly improved compared with traditional welding, due to the high laser power and fast cooling rate in the repair process, it is inevitable to cause stress distribution caused by heat input concentration when repairing more precise parts Unbalanced, which will lead to the deformation of the repaired parts, and even the secondary crack source

Method used

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  • Numerical simulation method for selective laser repair process
  • Numerical simulation method for selective laser repair process
  • Numerical simulation method for selective laser repair process

Examples

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Embodiment

[0051]Step 1: Establish a 3D model of the repaired part of the first-class turbine blade and the groove of the repaired zone in 3D software; carry out mesh division of different mesh types and different sizes of cells for the entire area of ​​the repaired model; laser repair and close-up The repair area (repair heat-affected zone) is divided into fine grids and analyzed with full hexahedron elements (the smallest mesh unit is 0.1mm), which not only improves the calculation accuracy compared with tetrahedron, but also reflects the regularity of additive manufacturing; the repair area In the rest of the transition area with the original model, the mesh size increases with the distance from the repaired area, and the hybrid mesh of tetrahedron and hexahedron is used for division (that is, the division is based on the hexahedron overall module algorithm, and the grid gap is added. Tetrahedral grid, the triangular vertices of the tetrahedral grid are docked with the nearest hexahedr...

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Abstract

The invention discloses a numerical simulation method for a selective laser repair process. The method includes the steps of establishing a three-dimensional geometric model of repaired parts and an area to be repaired and performing finite element mesh division; determining repair route process parameters, wherein floor height number of repair paths, laser optimal power parameters and current pulse width parameters which are required for the repaired area are determined by the morphology of the repaired area; preprocessing parameters of powder materials of the repaired area and establishing heat source loading conditions; defining heat source parameters and using a life-death strain method to obtain a final temperature field; calculating a residual stress field; determining whether or notthe maximum equivalent stress of the repaired area meets the allowable stress of the powder materials according to a calculation result of stress distribution. The numerical simulation method can optimize the repair process parameters, increase the one-time repair rate of the parts, and reduce deformation generated due to thermal stress.

Description

technical field [0001] The invention belongs to the technical field of laser printing, and in particular relates to a numerical simulation method of a selective laser repair process. Background technique [0002] Laser powder feeding repair equipment is composed of 400W-YAG laser, three-coordinate CNC workbench, powder delivery control system, etc. Laser powder feeding repair is a new type of rapid repair process, as a new technology in the additive manufacturing industry, its processing principle It conforms to the principle of discrete-accumulation molding. The repair principle is to use the laser transmitter as the processing energy, use the computer to control the laser beam to the processing material (metal powder) cladding path, adjust the appropriate laser energy parameters according to the predetermined speed, and according to the two-dimensional profile of the repair area section profile The data information is laser sintered and accumulated layer by layer. After t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 李晓敏赵晓明王佳骏曹通薛蕾
Owner XIAN BRIGHT ADDTIVE TECH CO LTD
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