Method for manufacturing metal laser melting additive

A technology of laser melting additive and manufacturing method, which is applied in the field of additive manufacturing to achieve the effects of low comprehensive production cost, high dense structure and high part qualification rate

Inactive Publication Date: 2018-04-06
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, complex metal parts without pores and cracks can be prepared

Method used

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  • Method for manufacturing metal laser melting additive
  • Method for manufacturing metal laser melting additive
  • Method for manufacturing metal laser melting additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) For the forming of high-performance 316L stainless steel alloy parts, the three-dimensional CAD model of the part is designed by using three-dimensional modeling software ( figure 1 ), and then processed by the slicing software and saved as an STL file ( figure 2 ), the data information of the STL file is sent to the laser additive manufacturing rapid prototyping equipment; the current slice layer is processed by the selective laser melting method, and the powder feeding mechanism spreads a layer on the metal substrate with a thickness of about 0.02mm and a particle size of 10μm 316L stainless steel powder, fiber laser power 160W; image 3 Laser scan the trajectory for the current layer to be printed.

[0032] (2) After processing the current slice layer, use an ultrasonic probe to scan the laser melting area line by line. Record the position of the defect feature, and set the rounded rectangle containing the defect ( Figure 4 ). After the flaw detection is co...

Embodiment 2

[0036] (1) For the forming of high-performance cobalt-based Co-27Cr-5Mo-0.5Ti alloy parts, use 3D modeling software to design the 3D CAD model of the part, and then save it as an STL file after being processed by the slicing software, and the data information of the STL file Delivered to laser additive manufacturing rapid prototyping equipment; the current slice layer is processed by laser near-net forming technology, so that 500W YAG laser, 50g / min cobalt-based alloy powder, and Ar gas are input to the substrate at the same time, with a layer thickness of 0.1mm;

[0037] (2) After processing the current slice layer, use an ultrasonic probe to scan the laser melting area line by line. Record the location of the defect feature, and set the enclosing rounded rectangle. After the flaw detection is completed, replace the ultrasonic probe with a milling cutter, and cut off the rounded rectangular area with a cutting thickness of 0.1mm;

[0038] (3) Re-use the laser near-net shapin...

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Abstract

The invention provides a method for manufacturing metal laser melting additive. After each layer of laser additive is manufactured and machined, a single-layer laser solidification area is traversed and scanned by adopting a nondestructive inspection method, the defect feature is recognized and positioned, the containing region is simplified, the defect area is removed by adopting a machining method, and finally the cutting area is repaired through the additive remanufacturing method. Each layer of additive manufacturing is subjected to laser melting, scanning flaw detection, mechanical removal and additive remanufacturing, so that the multi-layer machining is carried out in a reciprocating manner, and the complex metal parts without pores and cracks are manufactured.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, in particular to a metal laser melting additive manufacturing method. Background technique [0002] Laser melting additive manufacturing technology, also known as laser melting 3D printing, is an advanced manufacturing technology that has developed rapidly in recent years. The laser melting additive manufacturing technology of metal parts melts metal powder layer by layer through high-energy laser beams, and then realizes the manufacture of arbitrary complex metal parts, but cracks and pores are still important defects of laser additive manufacturing parts, together with residual stress, surface Roughness and other factors have become the bottleneck of forming laser additive manufacturing technology, which affects the application and promotion of laser additive manufacturing to high-performance metal parts. Contents of the invention [0003] Aiming at metallurgical defects such as cracks ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/38B22F10/32B22F10/25B22F12/90B22F10/28B22F10/50Y02P10/25
Inventor 王元刚吴蒙华王珍李晓鹏李淑娴
Owner DALIAN UNIV
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