Remanufactured crankshaft bending fatigue crack monitoring method, and apparatus and system thereof
A bending fatigue and monitoring device technology, applied in the field of remanufacturing, can solve the problem that cracks along the depth direction cannot be evaluated in real time, and achieve the effect of real-time monitoring and accurate evaluation.
Inactive Publication Date: 2016-01-13
ACADEMY OF ARMORED FORCES ENG PLA
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Problems solved by technology
[0005] In view of the above problems, the present invention proposes a method, device and system for monitoring bending fatigue cracks of remanufactured crankshafts, which can monitor the initiation and expansion signals of cracks at the front of the crankshaft, so as to solve the problem that the signals in the depth direction of cracks cannot be evaluated in real time in the prior art. question
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[0064] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0065] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof.
[0066] Those sk...
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The invention provides a remanufactured crankshaft bending fatigue crack monitoring method, and an apparatus and a system thereof. The method comprises the following steps: acquiring the sound emission signal of the transition fillet position of a crankshaft to be monitored in real time; carrying out parameter analysis on characteristic parameters of the sound emission signal and determining the generation phase corresponding to the bending fatigue crack of the crankshaft to be monitored according to the above obtained parameter analysis result; and acquiring the image data of the R angle surface of the crankshaft to be monitored, and correcting the generation phase corresponding to the bending fatigue crack of the crankshaft to be monitored according to the image data. The method, the apparatus and the system realize monitoring of the initiation and propagation signal of the front edge crack of the crankshaft, solve the problem of unable real-time assessment of cracks along a depth direction in the prior art, and can accurately evaluate crankshaft remanufacturing.
Description
technical field [0001] The invention relates to the technical field of remanufacturing, in particular to a method, device and system for monitoring bending fatigue cracks of a remanufactured crankshaft. Background technique [0002] The crankshaft is a key component of the engine. Its structure is complex, its manufacturing cost is high, and it has high added value. It is an important object for remanufacturing of auto parts. The traditional crankshaft fatigue strength design adopts the infinite life method, leaving a high safety margin in the design stage (for example, the new domestic crankshaft is usually 1.8 times the safety factor), which makes the material strength have a large redundancy. This creates conditions for the crankshaft to be remanufactured. [0003] The remanufacturing project must first answer the evaluation question of "whether the waste parts can be remanufactured". The failure forms of the crankshaft mainly include fatigue and wear. The scratches and...
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IPC IPC(8): G01N29/14G01N29/48
Inventor 王海斗董丽虹郭伟邢志国
Owner ACADEMY OF ARMORED FORCES ENG PLA