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Method for adjusting/reducing internal stress of laser additive manufacturing part

A laser additive and additive manufacturing technology, which is applied in the direction of additive manufacturing, additive processing, and improvement of process efficiency, can solve problems such as difficult control of internal stress

Inactive Publication Date: 2017-10-03
KUSN BAOJIN LASER TAILOR WELDED
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for regulating / reducing the internal stress of laser additive manufacturing parts, so as to solve the problem of difficult control of internal stress in the process of laser additive manufacturing, and realize laser thermal composite additive manufacturing with controllable internal stress

Method used

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  • Method for adjusting/reducing internal stress of laser additive manufacturing part
  • Method for adjusting/reducing internal stress of laser additive manufacturing part
  • Method for adjusting/reducing internal stress of laser additive manufacturing part

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Embodiment 1

[0028] Embodiment one: see figure 1 and figure 2 As shown, a method for regulating / reducing the internal stress of laser additive manufacturing parts comprises the following steps:

[0029] (1) Use a computer to establish a thin-walled part model, and process the model layered through software to obtain the contour level information of the part.

[0030] (2) The numerical control system is called to move the workbench 1 under the cladding head 2, and the cladding head 2 is provided with a laser beam by the fiber laser 5 to carry out coaxial powder feeding single-layer laser cladding to form the cladding layer 4 . In this embodiment, the experimental powder is 316L stainless steel, the particle size is 45 μm to 74 μm, the base material is 304 stainless steel, and the geometric size is 100 mm×100 mm×8 mm. Adopt laser power P=630W, powder feeding amount Mp=8g / min, scanning speed V=6mm / s, laser defocus amount is Z l =-3mm, and the process parameters of cladding length 30mm are...

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Abstract

The invention discloses a method for adjusting / reducing the internal stress of a laser additive manufacturing part. The method is used for laser coaxial powder feeding additive manufacturing, and comprises the following steps that (1) a three-dimensional additive manufacturing part model is established, and contour level information of the part is obtained; (2) a workbench is moved to a fusion covering station, and coaxial powder feeding laser additive manufacturing is conducted through a fusion covering head, and after processing of a fusion covering layer is completed, the workbench is descended by the height of one layer; (3) the workbench is moved to an impacting station, bulk heating is conducted on the fusion covering layer, after the fusion covering layer reaches the set temperature, laser impacting and strengthening are conducted on the fusion covering layer through an impacting head, and the set temperature is higher than the recrystallization temperature of a material and lower than the melting point of the material; and (4) the steps (2) and (3) are conducted repeatedly till the three-dimensional part is manufactured. According to the method, the residual compressive stress introduced by the laser impacting and strengthening technology is utilized to adjust and counteract the pulling stress in the hot melting process, and the laser thermal composite additive manufacturing method controllable in internal stress is achieved.

Description

technical field [0001] The invention relates to a method for laser additive manufacturing, in particular to a method for reducing internal stress of parts during laser additive manufacturing. Background technique [0002] Laser additive manufacturing technology is an advanced manufacturing technology developed on the basis of laser cladding and combined with rapid prototyping technology. Based on the "discrete-stack" forming principle, first establish the 3D CAD model of the processed parts, then divide the 3D model into a series of 2D planes, plan a reasonable laser scanning path according to the 2D plane outline, and then transform it into CNC work The operation instructions of the platform can finally realize the direct forming of metal parts. Compared with general rapid prototyping technology, laser additive manufacturing technology can quickly manufacture complex metal parts that are difficult to manufacture by traditional methods; realize the manufacture of functional...

Claims

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Application Information

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IPC IPC(8): B22F3/105C21D10/00B33Y10/00
CPCC21D10/005B33Y10/00B22F10/00B22F12/90B22F10/36B22F10/38B22F10/25B22F12/41B22F10/50Y02P10/25
Inventor 朱刚贤王丽芳傅戈雁石世宏
Owner KUSN BAOJIN LASER TAILOR WELDED
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