Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Rapid elimination method for shaft forging flaw detection phantom wave

An ultrasonic and phantom technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, process detection response signals, instruments, etc., can solve the problems of increasing losses, misjudgments, etc., to reduce losses, improve misjudgments, and improve flaw detection accuracy degree of effect

Inactive Publication Date: 2017-08-18
HANGZHOU STEAM TURBINE CASTING & FORGING
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the misjudgment that is easy to occur in the ultrasonic flaw detection of shaft forgings by conventional methods and increase unnecessary losses, it is necessary to propose a fast elimination method for phantom waves in ultrasonic flaw detection of shaft forgings

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rapid elimination method for shaft forging flaw detection phantom wave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] When using a 2-2.5M probe to radially detect shaft forgings, phantom waves may appear on the oscilloscope of the ultrasonic flaw detector. It is enough to detect the displayed parts. If the wave F on the oscilloscope disappears, the wave F is a fantasy wave; otherwise, the wave F is a defect wave, indicating that the shaft forging has defects and should be replaced or repaired in time.

Embodiment 2

[0032] In general flaw detection, adjust the sound path of the primary bottom wave B1 to the eighth grid of the oscilloscope. When the wave F is found to be displayed before the primary bottom wave B1, adjust the sound path knob of the ultrasonic flaw detector to increase the sound path to 1680mm. If the wave F on the oscilloscope disappears, the wave F is a fantasy wave; otherwise, the wave F is a defect wave, indicating that the shaft forging is defective and should be replaced or repaired in time.

[0033] The invention discloses a method for rapidly eliminating phantom waves in ultrasonic flaw detection of shaft forgings. When there is a signal wave F that is not sure whether it is a phantom wave or a defect wave, it adopts the method of adjusting the repetition frequency of the flaw detection instrument, changing the frequency of the probe and increasing the detection sound path. Any one of the three detection methods can detect whether the wave F is a defect wave. These t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention belongs to the technical field of shaft forging flaw detection, and discloses a rapid elimination method for a shaft forging flaw detection phantom wave. The rapid elimination method is based on phantom wave production factor analysis, is obtained through practice summarization, and comprises the following three operation parts: adjusting the repetition frequency of a flaw detection instrument, changing the frequency of a probe, and increasing a detection sound path, wherein ultrasonic wave flaw detection is performed again through one of the three operation parts, it is determined that the wave F is a phantom wave if the wave F disappears, and it is determined that the wave F is a defect wave if the wave F still exists. According to the present invention, the detection can be performed by using any one of the three detection methods if the appearing signal wave F being the phantom wave or the defect wave cannot be determined, such that the problem of the easy misjudgment of the conventional method is improved, the unnecessary loss is reduced, and the flaw detection accuracy of the shaft forging is improved.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of flaw detection of shaft forgings, in particular to a method for quickly eliminating phantom waves in ultrasonic flaw detection of shaft forgings. [0003] 【Background technique】 [0004] Shaft forgings, such as engine main shafts, rotor shafts of steam turbines and generators, and diesel engine crankshafts, etc., operate at high speeds and bear medium and high loads. In order to ensure the normal operation of shaft forgings, their defects must be detected. The defects of shaft forgings can be divided into external defects and internal defects. Ultrasonic flaw detection is the most suitable method for internal defects so far. At present, for the flaw detection of shaft forgings, the longitudinal wave straight probe contact method is usually used for flaw detection. Generally, flaw detection is carried out according to JB1581 in China and ASTM SA-388 in foreign countries. On the workpiece body, u...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N29/44G01N29/04
CPCG01N29/04G01N29/44G01N2291/023G01N2291/0289
Inventor 鲍俊乐周黎明
Owner HANGZHOU STEAM TURBINE CASTING & FORGING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com