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The measuring system for monitoring the microarc heating process during surface hardening of steel products
https://doi.org/10.32446/0368-1025it.2021-3-33-39
Abstract
The accelerated heat treatment during steel products hardening technology has been investigated. The possibility of measuring the temperature of steel products by thermoelectric platinum-platinum-rhodium thermocouple under microarc heating conditions is analyzed. During the experiments, working junctions of two S-type thermocouples: working and standard, were coined into the sample surface at the same level. The free thermocouples ends were connected to a digital multimeter and a personal computer. It was determined that 5 factors affect the measurement results: the electric current strength in the circuit, carbon powder, calibration, number of repeated measurement cycles, and a thermocouple copy. When planning the experiment, the concept of conducting a step-by-step nested experiment was used. Variance analysis method was used to process the experimental results. The measurement method precision parameters were calculated: repeatability and reproducibility. A linear mathematical model linking the measurement method reproducibility index with the measured temperature value has been obtained. A linear mathematical model is obtained that relates the reproducibility index of the measurement method to the measured temperature value. A measuring system for the experimental determination of the temperature of a steel sample is proposed and its application is justified for different electric current densities on the sample surface and varying duration of microarc heating. The possibilities of selecting and controlling the microarc heating modes depending on the required temperature of the heat treatment of the steel product are determined.
About the Authors
M. S. Stepanov
Don State Technical University
Makar S. Stepanov
Rostov-on-Don
I. G. Koshlyakova
Don State Technical University
Russian Federation
Russian Federation
Irina G. Koshlyakova
Rostov-on-Don
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Review
For citations:
Stepanov M.S., Koshlyakova I.G. The measuring system for monitoring the microarc heating process during surface hardening of steel products. Izmeritel`naya Tekhnika. 2021;(3):33-39. (In Russ.) https://doi.org/10.32446/0368-1025it.2021-3-33-39
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