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Method for heating metal material in additive manufacturing

A metal material and additive manufacturing technology, applied in the field of additive manufacturing, can solve problems such as the inability to flexibly change the temperature curve of metal materials, and achieve the effect of improving the structure and mechanical properties of materials

Inactive Publication Date: 2016-10-05
CHINA WEAPON EQUIP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a method for changing the temperature change curve of metal materials in the process of additive manufacturing by changing the power density distribution on the cross section of the laser beam, and solves the technology that cannot flexibly change the temperature change curve of metal materials in the process of additive manufacturing in the prior art question

Method used

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  • Method for heating metal material in additive manufacturing
  • Method for heating metal material in additive manufacturing
  • Method for heating metal material in additive manufacturing

Examples

Experimental program
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Effect test

Embodiment 1

[0032] figure 2 A schematic diagram of laser additive manufacturing of metal materials is given in Embodiment 1, wherein the laser 1 is a fiber laser 7, the laser beam 2 is a single-mode laser beam 8, and the beam shaping element 3 is a deformable mirror 31. The specific steps of the metal material heating method are as follows:

[0033] Step 1, the single-mode laser beam 8 produced by the fiber laser 7 is irradiated on the deformable mirror 31 as the beam shaping element, the phase is adjusted by the deformable mirror 31, and then reflected to the workpiece substrate 5 to form a spot; by controlling the mirror surface of the deformable mirror 31 Topography can flexibly control the power density of each spot, for example, the power density of the spot can be controlled as image 3 The distribution described in .

[0034] In step 2, the spot moves on the workpiece substrate 5 according to a preset track, and the nozzle 6 sprays the metal material to the front edge of the spot...

Embodiment 2

[0036] Figure 5 A schematic diagram of laser additive manufacturing of metal materials in Embodiment 2 is given, wherein the laser 1 selects a solid-state laser 9, the laser beam 2 adopts a multimode laser beam 10, the beam shaping element 3 includes a micromirror array 11 and a lens group 12, and the metal material heating method Specific steps are as follows:

[0037] Step 1, the multi-mode laser beam 10 generated by the solid-state laser 9 is irradiated onto the micromirror array 11, the amplitude is modulated by the micromirror array, and then focused onto the workpiece substrate 5 through the lens group 12 to form a spot. By controlling the reflection direction of each mirror surface on the micromirror array 11, light and dark changes can be flexibly produced around the spot, thereby controlling the power density of the spot, Figure 6 A spot power density distribution curve is given.

[0038] Step 2: The light spot moves on the workpiece substrate 5 according to a pre...

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Abstract

The invention relates to a method for heating a metal material in additive manufacturing. Power density distribution on a cross section of a laser beam emitted by a laser is controlled by a light beam shaping technology, thereby flexibly controlling a temperature variation curve of the heated metal material; and an extra design degree of freedom is provided for a material process design of additive manufacturing, thereby improving an organization form and mechanical properties of an obtained material or realizing the organization form and the mechanical properties with special requirements.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a method for heating metal materials in additive manufacturing. Background technique [0002] Laser near-net shaping technology, referred to as LENS, generally uses laser beams to heat metal materials to melt and accumulate along a set trajectory, thereby realizing additive manufacturing. In the manufacturing process, the temperature change curve of the material has a considerable impact on the material structure and mechanical properties of the final workpiece, and is an important part of the material process. [0003] The power density distribution of the laser beam used in the current laser near-net shaping technology on the cross section is either a Gaussian distribution (corresponding to a laser with a fundamental mode output), or a flat-top distribution (corresponding to a laser with a multimode output), which cannot be changed. , so the temperature change...

Claims

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Application Information

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IPC IPC(8): B23K26/00
Inventor 王琦刘嘉巍郭学佳杨超杨宁黄声野冯晓波
Owner CHINA WEAPON EQUIP RES INST
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