Актуальные проблемы в машиностроении. Том 10. № 1-2. 2023 Технологическое оборудование, оснастка и инструменты ____________________________________________________________________ 35 29. Борисов М.А., Мишин В.А. Влияние продолжительности импульсов тока на интенсивность электрохимического шлифования // Актуальные проблемы в машиностроении. – 2019. – Т. 6, № 1-4. – С. 48–52. DEVICE FOR AUTOMATIC CHANGE OF CURRENT POLARITY WHEN SHARPENING BAR CUTTERS Borisov M.A.1, Ph.D. (Engineering), Associate Professor, e-mail: borisovmgou@mail.ru Zvorygin A.S.2, Advanced manufacturing engineer, e-mail: zvor95@yandex.ru 1I.N. Ulianov Chuvash State University, 15 Moskovsky Prospekt, Cheboksary, 428015, Russian Federation 2All-Russian Research Institute of Experimental Physics FSUE RFNC-VNIIEF, 37 Mira Ave., Sarov, 607188, Russian Federatio Abstract In the construction industry, when laying urban communications, as well as other earthworks, drilling machines and trenchers are used, whose main working tool is, for example, a cutter of the RP-3 brand with a hard-alloy insert soldered onto a steel holder. With long-term work without bar cutters sharpening, catastrophic wear of the carbide cutting insert occurs. Thus, the cutter requires to be replaced with a new one. Regrinding of cutters by known methods is not rational, since it is necessary to process different materials: a steel holder and a carbide insert. This requires the use of different grinding wheels, for example, diamond wheels for processing a carbide insert and electrocorundum wheels for processing a steel holder, which increases the labor intensity and cost of cutters sharpening used in trenchers. This shortcoming can be eliminated by applying the combined method of electrochemical grinding with a diamond tool and changing the polarity of the current during the transition from hard alloy machining to steel machining. When processing a hard-alloy insert, it will be an anode, which will allow its softening. When processing a steel holder, the anode will be a diamond conductive wheel, which will prevent its clogging and allow its electrochemical dressing. The purpose of the work is to develop a programmable device for automatic change of current polarity when sharpening bar cutters. A device for electroabrasive sharpening of bar cutters with electrochemical dressing of an abrasive conductive tool was chosen as the object of research. The research methodology provides for the development of a device for selfacting changing the polarity of the current when sharpening bar cutters. Evaluation of the working capacity of the developed device consists in the possibility of automatic control of the current polarity reversal according to a given program during the transition from hard alloy processing to steel processing. The tests carried out confirmed that the developed programmable device automatically controls the current polarity reversal in accordance with the operation of the CNC machine. Keywords Preparation of production, production system, modeling, automation, multicriteria analysis, comparison.
RkJQdWJsaXNoZXIy MTk0ODM1