【摘要】：材料內(nèi)部有缺陷(夾渣、氣孔、裂紋等)在制成軸承或者齒輪后,在受到交變載荷的作用時,缺陷會產(chǎn)生應(yīng)力集中而迅速增大,從而割裂材料,造成零件破壞,甚至造成重大事故,因此要對鋼廠生產(chǎn)出的材料進(jìn)行檢測。在目前常用的五種無損檢測方法當(dāng)中,渦流、磁粉和滲透檢測法主要用于檢測表面及近表面的缺陷,因此,不考慮采用這三種方法。射線檢測,檢測靈敏度較高,且對零件的結(jié)構(gòu)也沒有特殊要求,但不適合檢測鍛造類缺陷,容易造成漏檢�；谝陨峡紤],只有采用超聲波進(jìn)行檢測。本試驗選用三種航空軸承齒輪材料做成的試塊作為研究對象,在試塊底部有一個直徑Φ0.4mm,孔深1.0mm的平底孔,根據(jù)基礎(chǔ)理論知識設(shè)計出與不同厚度試塊相匹配的探頭,然后使用數(shù)字式超聲波探傷儀進(jìn)行探傷實驗,根據(jù)實際探傷后的結(jié)果進(jìn)行分析討論,逐漸優(yōu)化探頭的設(shè)計,以達(dá)到對三種航空軸承齒輪材料進(jìn)行精密探傷的目的。最終通過對人工缺陷進(jìn)行大量的檢測試驗,對檢測方法和檢測結(jié)果進(jìn)行驗證,得出:采用特殊的探頭,使用高靈敏度的水浸超聲聚焦檢測技術(shù),可以有效地檢測出三種航空軸承齒輪材料20mm厚試塊內(nèi)的缺陷,對于三種材料40mm厚試塊內(nèi)部同樣大小的缺陷則無法檢測出來。
[Abstract]:There are defects in the material (including slag, air holes, cracks, etc.) after they are made into bearings or gears, when they are subjected to the action of alternating load, the defects will produce stress concentration and increase rapidly, thus breaking the material and causing damage to the parts. Even caused major accidents, so the steel plant to produce materials for testing. Among the five commonly used nondestructive testing methods, eddy current, magnetic particle and permeation methods are mainly used to detect surface and near-surface defects. Therefore, these three methods are not considered. The sensitivity of radiographic detection is high and the structure of parts is not required, but it is not suitable to detect forging defects, which can easily lead to missed detection. Based on the above considerations, only ultrasonic testing. In this experiment, three kinds of aeronautical bearing gear materials were selected as the research object. There is a flat bottom hole with diameter 桅 0.4mm and hole depth 1.0mm at the bottom of the test piece. According to the basic theoretical knowledge, the probe matching with different thickness test blocks is designed. Then the digital ultrasonic flaw detector is used to carry on the flaw detection experiment, according to the actual inspection result carries on the analysis discussion, gradually optimizes the probe design, in order to achieve three kinds of aviation bearing gear material to carry on the precision flaw detection goal. Finally, through a large number of testing experiments on artificial defects, the testing methods and results are verified. It is concluded that the special probe is used, and the high sensitivity ultrasonic focused water immersion detection technology is used. The defects in 20mm thick test blocks of three kinds of aeronautical bearing gear materials can be effectively detected, but the same size defects in 40mm thick test blocks of three kinds of materials can not be detected.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：V267;TB559

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相關(guān)期刊論文 前10條

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本文編號：2275976