Additive manufacturing online detection device and method based on transmission-type laser ultrasound

A laser ultrasonic and additive manufacturing technology, applied in measuring devices, material analysis using sonic/ultrasonic/infrasonic waves, solids analysis using sonic/ultrasonic/infrasonic waves, etc. It can solve the problem of signal instability, low ultrasonic energy, and buried defect detection. Insufficient capacity and other problems to avoid interference, avoid insufficient detection capacity, and solve insufficient ultrasonic coverage

Pending Publication Date: 2022-08-05
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, this application provides an additive manufacturing online detection device and method based on transmission laser ultrasound, which can effectively solve the problems of low ultrasonic energy, unstable signal and insufficient detection capability of buried defects in the existing laser ultrasonic online detection device. question

Method used

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  • Additive manufacturing online detection device and method based on transmission-type laser ultrasound
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  • Additive manufacturing online detection device and method based on transmission-type laser ultrasound

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Experimental program
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Embodiment 1

[0041] refer to figure 1 and figure 2 , this embodiment provides an online detection device for additive manufacturing based on transmissive laser ultrasound, including: an ultrasonic excitation module, a laser ultrasonic receiving module, a data acquisition and imaging module; the above-mentioned ultrasonic excitation module includes a piezoelectric sensor 130 and a pulse transmitter 120 The above-mentioned laser ultrasonic receiving module includes a laser vibrometer 150 , an optical head and a scanning galvanometer 160 ; the above-mentioned data acquisition and imaging module includes a motion control card and a data acquisition card 140 .

[0042]The above-mentioned piezoelectric sensor 130 is placed on the back of the substrate 200 to excite the ultrasonic signal, and the above-mentioned pulse transmitter 120 is used to connect the piezoelectric sensor 130 to transmit a pulse signal; the above-mentioned laser vibrometer 150 is used to connect the optical head to emit a d...

Embodiment 2

[0046] refer to Figure 3-7 , select the 316L stainless steel sample printed by laser cladding, and set through hole defects of different sizes inside, and the defect sizes are The depth is 15mm.

[0047] This embodiment provides an on-line detection method for additive manufacturing based on transmissive laser ultrasound, which is implemented by the on-line detection device for additive manufacturing based on transmissive laser ultrasound provided in Embodiment 1. The method includes the following steps:

[0048] S1. Array probe excitation and data collection received by array scanning: Five piezoelectric sensors 130 are set on the back of the substrate 200, and the ultrasonic waves are excited in sequence directly under each defect; the center of the array corresponding to the surface of the printed part on the opposite side is set as At the center of the array scanning and receiving, the spot of the detection laser is scanned and received by N*N in the horizontal direct...

Embodiment 3

[0053] refer to Figure 8-12 , select the 316L stainless steel sample printed by laser cladding, and set through hole defects of different depths inside, and the defect size is The defect depths are: 5mm, 10mm, 15mm, 20mm, 25mm.

[0054] It is realized by adopting the online detection device for additive manufacturing based on transmission type laser ultrasound provided in Example 1, and the above method includes the following steps:

[0055] S1. Array probe excitation and data collection received by array scanning: Five piezoelectric sensors 130 are set on the back of the substrate 200, and the ultrasonic waves are excited in sequence directly under each defect; the center of the array corresponding to the surface of the printed part on the opposite side is set as At the center of the array scanning and receiving, the spot of the detection laser is scanned and received by N*N in the horizontal direction, and the scanning distance is 0.4mm, so that each piezoelectric sensor ...

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Abstract

The invention discloses an additive manufacturing online detection device and method based on transmission-type laser ultrasound. In the technical scheme, a pulse transmitter is connected with a piezoelectric sensor and located at the bottom of a substrate to excite an ultrasonic signal, and a laser vibration meter is used for being connected with an optical head to transmit detection laser with a certain wavelength; the detection laser vertically enters the surface of the printed piece through the scanning galvanometer to scan and collect an ultrasonic signal; the ultrasonic signal is carried by reflected light of the receiving laser on the surface of the printed piece and returns to the laser vibration meter through the scanning galvanometer. And setting an imaging area according to the ultrasonic coverage range of a single ultrasonic sensor, carrying out sonic path distance calculation on each point in the imaging area according to the propagation law of diffraction transverse waves, extracting the amplitude of each scanning point when an A scanning signal corresponds to sound, carrying out delay superposition, and carrying out three-dimensional imaging on the defect. The problems that an existing laser ultrasonic online monitoring device is low in ultrasonic energy, unstable in signal and insufficient in buried defect detection capacity can be solved, and three-dimensional visualization of buried defects is achieved.

Description

technical field [0001] The present application relates to the technical field of on-line non-destructive testing of intelligent manufacturing quality, in particular to an on-line testing device and method for additive manufacturing based on transmission laser ultrasound. Background technique [0002] Metal additive manufacturing technology is a new type of manufacturing technology that uses metal powder or wire as raw material and high-energy heat source as a tool to prepare high-performance metal components. However, due to the process characteristics of melting and reciprocating accumulation of materials, defects such as pores, slag inclusions, and cracks are easily generated during the manufacturing process. The size and distribution of these defects are random, and will be delayed by residual stress, which ultimately affects the quality and service life of the product. [0003] For online inspection technology, it has the technical requirements that the printing surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/24
CPCG01N29/04G01N29/2437G01N2291/01G01N2291/0234G01N2291/106Y02P10/25
Inventor 张俊江林钊杨兵陈飏代洪伟
Owner WUHAN UNIV
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