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Ultrasonic wave A scanning and recognizing method for internal defect in forged piece

A technology of internal defects and identification methods, which is applied in the direction of analyzing solids using sound waves/ultrasonic waves/infrasonic waves, can solve problems such as inaccurate judgments, and achieve the effects of strong operability, clear classification, and accurate description of waveform characteristics

Inactive Publication Date: 2015-07-15
NANJING DEV ADVANCED MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a simple and convenient ultrasonic A-scan identification method for internal defects of forgings, aiming at the inaccurate determination of forging defect types by ultrasonic A-scan in the prior art

Method used

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  • Ultrasonic wave A scanning and recognizing method for internal defect in forged piece
  • Ultrasonic wave A scanning and recognizing method for internal defect in forged piece
  • Ultrasonic wave A scanning and recognizing method for internal defect in forged piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The ultrasonic A-scan waveform includes a single sharp pulse, tree-like features, and the peak of the reflected wave is clear and sharp, but it disappears with a slight movement of the probe. The defect is a single-peak defect, and a single-peak defect is a point-like defect. Please refer to figure 2 shown.

Embodiment 2

[0053] The ultrasonic A-scan waveform includes multiple sharp pulses, forest-like features, and the peak of the reflected wave is clear and sharp, but it disappears when the probe is moved slightly. The defect is a multi-peak defect, and the multi-peak defect includes multiple point-like defects. image 3 shown.

Embodiment 3

[0055]The ultrasonic A-scan waveform includes multiple spikes and the position of the spikes switches when the probe moves slightly, the height of the trough is greater than 0, the defect is a continuous peak defect, and the continuous peak defect is a multi-point dense defect, please refer to Figure 4 shown.

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Abstract

The invention discloses an ultrasonic wave A scanning and recognizing method for an internal defect in a forged piece. An ultrasonic wave A scanning detector is used for detecting the forged piece, and ultrasonic wave A scanning waveforms are obtained. Operability is high, a static moving probe and a dynamic moving probe are adopted in a description method, and the morphological characteristics of waves and peaks can be observed. Waveform characteristic description is more accurate, a detection result is visual and reliable, the classification of defect type characteristics is clear, and therefore favorable judging criteria are provided for the final judgment of quantifying, nature determining and positioning of the defect. According to the ultrasonic wave A scanning function, the ultrasonic wave defect characteristic waveforms of the forged piece can be obtained, the specific position and the shape characteristics of the defect are obtained, and accurate prediction criteria are provided for safety assessment, service life estimation, FFT frequency spectrum calculation and the like of the forged piece.

Description

technical field [0001] The invention relates to the field of ultrasonic A-scanning, in particular to an ultrasonic A-scanning identification method for internal defects of forgings. Background technique [0002] Forgings are formed by forging and pressing of hot steel ingots. The forging process includes heating, deformation and cooling. The methods of forging are roughly divided into upsetting, drawing and rolling. Upsetting is when pressure is applied to both ends of the blank during forging, and deformation occurs on the cross section. Elongation is the pressure applied to the outer circle of the billet during forging, and the deformation occurs in the length direction. Rolling is to upset the blank first, then punch the hole and then insert the mandrel and apply pressure on the outer circle. Rolling has both longitudinal deformation and transverse deformation. Among them, upsetting is mainly used for cake forgings, and elongation is mainly used for shaft forgings, ...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 张利陈昌华
Owner NANJING DEV ADVANCED MFG