Application of Audio Frequency Method in Vermicular Graphite Cast Iron Inspection
Author of the article:ZHOU Fei
Author's Workplace：Anhui Highly Precision Casting Co., Ltd., Ma'anshan 238101,China
Key Words：vermicular graphite cast iron vermicular graphite rate audio frequency value
Abstract：
The traditional method to determine vermicular rate of vermicular cast iron was to sample and test the metallography of the same batch of castings. The disadvantage was that when the casting quality was unstable, it can not meet the requirement of 100% inspection of all casting products. Combined with the principle of audio detection, H company and the equipment manufacturer developed a set of vermicular graphite cast iron flywheel audio equipment, and carried out a comparative test between the flywheel metallography(different vermicular rates) and audio. The results show that the audio-frequency detection method is reliable, and the creep rate of flywheel is linear with the audio-frequency, and the audio-frequency detection range is determined. In addition, the audio method can also indirectly detect whether there is a defect at the percussion.
