Determination of Temperature of Maximum Working Capacity of Tool Hard Alloys

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Introduction. Nowadays cutting modes for metal processing are specified according to reference data or according to recommendations of tool manufacturers. Often this information does not provide optimal cutting modes. The situation is aggravated in the case of modern automated metal-working equipment, where a premature failure of the tool entails high economic losses due to damage of the workpiece surface, i.e. manufacturing issue. Studying the changes in performance of metalworking tools under the influence of temperatures arising during processing will prevent its premature failure. The subject of the study is replaceable cutting inserts made of tool hard alloys. The object of the study is to determine (by means of a shortcut method) a temperature of maximum working capacity of the replaceable cutting inserts according to relations of electrical conductivity of tool hard alloys relevant to WC-TiC-Co group in all temperature ranges of metal cutting. Research technique. The paper contains an analysis of existing methods of determination of maximum working capacity temperatures of replaceable cutting inserts made of THA (tool hard alloys). Existing plants for tests performance are analyzed. A new plant for accelerated determination of temperature of maximum working capacity of the replaceable cutting inserts made of THA are developed as a result of the analysis. This new plant excludes the discovered deficiencies. The paper contains a description of the developed method for accelerated determination of temperature of maximum working capacity for changing the electrical conductivity of replaceable cutting inserts made of instrumental hard alloys relevant to WC-TiC-Co group. Results and discussions. The results of the study of electrical conductivity as a function of the test temperature of the WC-TiC-Co group alloys are obtained. On the basis of the data obtained, the temperatures of maximum working capacity of alloys 5%TiC+85%WC+10%Co 730-780°С, 15%TiC+79%WC+6%Co 860-970°С are determined. The applicability of the developed method on alloys of the WC-TiC-Co group is proved. On the basis of the evidence, it can be stated with reliable accuracy that the resulting temperature intervals, where the values of electrical conductivity have minimal values, correspond to the optimum cutting temperature at which there is minimal surface wear on the back surface, and correspond to the temperatures of the maximum operability of the THA in the author's interpretation.

About the authors

E. V. Artamonov

Email: evgart2014@mail.ru
D.Sc. (Engineering), Professor; Tyumen Industrial University, 38 Volodarskogo st., Tyumen, 625000, Russian Federation; evgart2014@mail.ru

A. M. Tveryakov

Email: tveryakov@mail.ru
Ph.D. (Engineering), Associate Professor; Tyumen Industrial University, 38 Volodarskogo st., Tyumen, 625000, Russian Federation; tveryakov@mail.ru

A. S. Shtin

Email: shtin92@mail.ru
Tyumen Industrial University, 38 Volodarskogo st., Tyumen, 625000, Russian Federation; shtin92@mail.ru

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