By Helen Zhang, M. Han, X. J. Zhao
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Extra info for Advanced Research on Industry, Information System and Material Engineering IV
This section uses the relay to switch from coarse grinding to fine grinding mode or vice versa, sharing a 12V power . LED Display Circuit. The display circuit consists of two parts: one is the speed setting display circuit with 3-bit LED; the other part is the remaining amount of polishing liquid display circuit with 4-bit LED. Speed controlling is achieved by way of delay. Delay parameter setting range is 0-999 seconds. Liquid remaining amount is counted by drop-wise descending countdown mode.
State and Alarm Circuit. This part circuit is used to display the current State, mode and alarm. Keyboard Circuit. This part circuit is used to set system parameters, mode switching, limiting, counting and resetting etc, using an interface of switch or key. Data Storage Circuit. The part circuit is used to store current parameters and the remaining liquid value. circuit was designed based on non-volatile memory chip (Figure 3) to avoid data loss after the shutdown. MCU Core Control Circuit. This section include the AVR microcontroller, the clock circuit, reset circuit and ISP download circuit.
Aluminum oxide and chromium oxide is used as the polishing powder for steel and cast iron, fine grained magnesium oxide can be used as polishing powder for non-ferrous metals and other soft materials. Polishing can be classified as rough polishing and fine polishing. When polishing, pressure should not be too large. Polishing time depends on the quality of the polished surface of the sample, generally about 5 to 15 minutes. After polishing, rinse polished surface with water first, and then wash with absolute alcohol, finally dry with a hair dryer[9,10].