Monitoring of rolling wear using the alternating current potential drop method

点击翻译按钮获取中文摘要

A surface damage evaluation system was developed. The alternating current potential drop (ACPD) method was used in this system. This system consists of a personal computer, a frequency generator, a power current amplifier, two DC amplifiers and two high speed A/D converters and has a compensating technique for inductive pick-up of AC voltage. The inductive pick-up is the most important cause of measurement error at ACPD method. Middle carbon steel and bearing steel were used for rolling wear specimens, and reciprocating rolling wear tests were carried out. Signals of ACPD from surface which damaged with rolling wear and applied alternating current were measured. These signals were analyzed by computer program and the phase difference between these signals was detected. Then the inductive pick-up was compensated.The conclusions which were obtained in this research are summarized in the following.(1) Using the compensation technique, the true value of ACPD could be estimated successfully.(2) Reciprocating rolling wear proceeds with producing small flaky wear particles.(3) From the change in estimated ACPD values against the number of cycles, it can be seen to the tendency of decreasing before about 10^5 cycles and increasing after about 10^5 cycles. The reason seems to change in the electrical properties of materials and current path caused from wear of lower specimens.