Automatic ultrasonic detecting method and device of defects inside old crank of engine

An automatic detection and internal defect technology, which is applied in measuring devices, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, and using sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., can solve problems such as low detection efficiency, easy missed detection and false detection. , to achieve the effect of fast detection speed and high detection accuracy

Inactive Publication Date: 2011-02-16
ACADEMY OF ARMORED FORCES ENG PLA
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Problems solved by technology

[0004] The purpose of the present invention is to provide an automatic ultrasonic detection method and detection device for the internal defects of the old crankshaft of the engine, so as to solve the problems that the conventional ultrasonic detection method of the crankshaft has low detection efficiency and is easy to miss and misdetect

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  • Automatic ultrasonic detecting method and device of defects inside old crank of engine
  • Automatic ultrasonic detecting method and device of defects inside old crank of engine
  • Automatic ultrasonic detecting method and device of defects inside old crank of engine

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Embodiment Construction

[0018] The present invention is described in detail below in conjunction with embodiment: embodiment implements on the premise of technical scheme of the present invention, has provided detailed implementation, but protection scope of the present invention is not limited to following embodiment.

[0019] A 45# steel normalized waste crankshaft of Steyr engine was selected for ultrasonic testing. The whole crankshaft has 7 main journals and 6 connecting rod journals. First, select a curved single-crystal double-slope probe with a probe frequency of 2.5MHz, a chip size of 9mm×9mm, a forward tilt angle of γ of 45°, and a side tilt angle of φ of 10°. The size of the probe is 38mm×18mm×30mm, and the curvature of the lower surface of the probe The same curvature as the crankshaft main journal, the diameter of the main journal is 100mm. Select the material of the calibration test block as 45# steel, and follow the figure 1 and figure 2 The shapes shown are produced by finishing wi...

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Abstract

The invention relates to an automatic ultrasonic detecting method and device of defects inside an old crank of an engine, belonging to the field of automatic ultrasonic detection. The method comprise the steps of: firstly, calibrating a single crystal angle probe by adopting a crank probe calibration test block, determining detection parameters of a real front rake angle beta and a real side rake angle beta' of the probe, a probe zero point, material sound velocity of the crank, and the like; and then detecting the crank by adopting a crank automatic ultrasonic detection device, wherein the detection device comprises a crank clamp and an ultrasonic probe clamp, the crank clamp is used for clamping the crank and enabling the crank to rotate at constant speed, the ultrasonic probe clamp is used for clamping the probe, and after the crank rotates for one circle, the probe can check a shaft neck for one circle. Internal defects of the shaft neck and an R angle can be automatically detected by adopting one probe, thus the reliability and the detection efficiency are furthest improved. The method can be used for detecting the defects of cracks, impurities, air holes and the like with equivalent size of above 1mm inside the shaft neck and at the R angle.

Description

Technical field: [0001] The invention relates to an automatic ultrasonic detection method and a detection device for internal defects of an old crankshaft of an engine. Background technique: [0002] In the 21st century, protecting the global environment and maintaining the sustainable development of society has become a topic of common concern in the world. Using advanced remanufacturing engineering technology to repair fatigued mechanical parts, so that its quality and performance can reach or exceed new products, is an effective way to upgrade waste equipment, in line with sustainable development strategies, building a conservation-oriented society and developing "low carbon" "The demands of the economy. Engine remanufacturing is the most typical application example in remanufacturing engineering. The crankshaft is the main moving part of the engine, which is subjected to complex alternating loads and impacts. After a period of use, it is easy to produce fatigue cracks. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/30G01N29/04
Inventor 董世运徐滨士石常亮刘彬
Owner ACADEMY OF ARMORED FORCES ENG PLA
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