Online monitoring method for laser additive manufacturing

A laser additive and laser power technology, which is applied in the field of additive manufacturing, can solve the problems that the quality requirements of laser additive manufacturing are difficult to meet, and achieve the effect of avoiding difficult operation

Active Publication Date: 2018-11-20
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the object of the present invention is to provide an online monitoring method for laser additive manufact

Method used

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  • Online monitoring method for laser additive manufacturing
  • Online monitoring method for laser additive manufacturing
  • Online monitoring method for laser additive manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0073] Example one:

[0074] An online monitoring method for laser additive manufacturing containing ceramic reinforced phase coating, including the following steps:

[0075] S1: Install each device; specifically, multi-wavelength pyrometer, CCD high-speed infrared camera, laser processing head, laser power detector (with feedback and detection functions, used for power measurement and feedback, and power automatic adjustment), CCD high-speed camera and protective gas pipeline shall be installed and set as required;

[0076] S2: The test sample is placed at the designated position; Fe-based stainless steel powder is selected here, and the Fe-based stainless steel 316L is used for additive manufacturing. The strengthening phase is WC, and the proportion of strengthening phase WC is 2.5%, 5% and 10%. The powder feeding method is adopted. The WC and Fe-based powders are uniformly mixed by a ball mill.

[0077] S3: Fixed laser scanning speed (V=10mm.s -1 ) And laser powder feeding rate ...

Example Embodiment

[0086] Embodiment two:

[0087] In this embodiment, the powder used is Ni-based alloy In625, the experimental substrate is 316 stainless steel, and the strengthening phase is TiC powder. The content of TiC in the period is 10%, 20%, and 30%. The difference from Example 1 is

[0088] In the acquisition phase of T1 parameters, the laser scanning speed is fixed (V=10mm.s -1 ) And laser powder feeding rate (Mp=10g / min, laser spot D=4mm and laser defocusing amount F=0, keep the existing parameters of the equipment unchanged during the whole processing, the same as below), change different laser power (P=2000~500W) Perform experiments, use a temperature recorder to record the temperature at the center of the molten pool and use a CCD camera to record the diameter of the molten pool, and obtain the data of the temperature center and the diameter of the molten pool under different laser powers; determine according to the criterion Effective relational expression T1, the effective range of...

Example Embodiment

[0092] Example three:

[0093] The difference between this embodiment and the first embodiment is that:

[0094] Laser additive manufacturing is carried out by powder feeding. The powder used is Co-based alloy Stellite6, the experimental substrate is 316 stainless steel, and the strengthening phase is TiN powder.

[0095] In the acquisition phase of T1 parameters, the laser scanning speed is fixed (V=10mm.s -1 ) And laser powder feeding rate (Mp=10g / min, laser spot D=4mm and laser defocusing amount F=0, keep the existing parameters of the equipment unchanged during the whole processing, the same as below), change different laser power (P=2000~500W) Perform experiments, use a temperature recorder to record the temperature at the center of the molten pool and use a CCD camera to record the shape of the molten pool, and obtain data on the center of the molten pool temperature and the diameter of the molten pool under different laser powers; according to the criterion Determine the effe...

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Abstract

The invention discloses an online monitoring method for laser additive manufacturing. The method includes the following steps that the center temperature of a molten pool and the diameter of the molten pool are collected in real time; and when the collected center temperature of the molten pool or the collected diameter of the molten pool does not conform to the pre-stored relationship of the laser power P, the center temperature of the molten pool and the diameter of the molten pool, the laser power P is adjusted according to the relationship so that the collected center temperature of the molten pool and the diameter of the molten pool conform to the pre-stored relationship of the laser power P, the center temperature of the molten pool and the diameter of the molten pool. By the application of the online monitoring method for laser additive manufacturing, online monitoring and control purposes are achieved, afterward detection is changed into intervening in the process, and the beneficial effects of good controllability and high machining efficiency are achieved. The online monitoring method can be better applied to large-size and large-area online monitoring in the field of ships, rail traffic and the like, the online monitoring method can better adapt to a flexible manufacturing environment, and more far-reaching practical significance is achieved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, and more specifically, to an online monitoring method for laser additive manufacturing. Background technique [0002] The process of laser additive manufacturing is different from that of traditional materials. After casting, forging, and processing, traditional materials use X-ray, ultrasonic and other testing methods to determine whether the materials are qualified. Unqualified products are scrapped or welded. method to remedy. However, because laser additive manufacturing is produced by layer-by-layer stacking, it is significantly different from traditional manufacturing methods in terms of quality monitoring and monitoring. [0003] For additive manufacturing, typically, each laser scan melts and resolidifies several layers of powder, typically 20 μm to several mm thick. After each laser shot, additional powder is scraped from the work area (powder spreading) or fresh powder ...

Claims

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Application Information

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IPC IPC(8): B22F3/105B33Y10/00B33Y30/00B33Y50/02
CPCB22F3/003B33Y10/00B33Y30/00B33Y50/02B22F10/00B22F10/368B22F10/25B22F12/90Y02P10/25
Inventor 张敏陈长军
Owner SUZHOU UNIV
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