Recommendations for the Selection of Changeable Indexable Inserts for Straight Turning Tools

Purpose of research. The main technological problem of tooling backup of machining operations by turning the surfaces of parts of various structural complexities is the choice of the rational design of a changeable indexable insert for equipping straight-turning tool. Known technical solutions are associated with the selection of the shape of the changeable insert and the rational geometric parameters of its cutting element to the closest possible desired option. However, in the current engineering industry it is impossible, and it is economically unprofitable to have a large number of standard cutting inserts with step-by-step gradation of geometric parameters.  It should be noted that the operation of turning structurally complex surfaces of parts of the class 71-Body of rotation is characterized by the multivariance of tooling backup, concerning both the selection of the optimal tool design and the rational grade of its cutting part. The most time-consuming part of the task is related to the fulfillment of the multiple requirements for the grade of tool material, namely: maintaining the necessary resistance in the conditions of interrupted cutting, within the boundaries of a given batch of parts, while ensuring the productivity, accuracy and roughness of the machined surfaces of complex profiles established by the production task.

Methods. To solve this problem, methods of system analysis were used, which made it possible to establish a functional relationship between the structural complexity of surfaces machined by cutting of complex profile and the design of changeable indexable insert of straight turning tool.

Results. It has been shown that the composite10 is potentially the best grade of tool material, for clean turning of structurally complex surfaces. The characteristics of tool materials are presented that allow, by alternative choice of a rational grade of changeable indexable insert, to confirm the adequacy of the decisions made.

Conclusion Recommendations have been developed on choosing the structural form and grade of tool material of changeable indexable inserts for clean turning operations on surfaces of complex profiles of parts of the class 71-Body of rotation. It is shown that the use of a rational shape of the cutting element is capable, under intermittent cutting, to provide predetermined performance indicators, accuracy and processing quality. 

1. Kudryashov E.A., Nikonov A.M., Stetsurin A.V. General Approach to Composite Tools. Russian Engineering Research, 2008, vol. 28, no. 6, pp. 611-613.

2. Kudryashov E.A., Stetsurin A.V. More Efficient Repair Method. Russian Engineering Research, 2008, vol. 28, no. 9, pp. 924-925.

3. Kudryashov E.A., Nikonov A.M. Machining parts made from diverse materials. Russian Engineering Research, 2008, vol. 29, no. 3, pp. 313-315.

4. Kudryashov E.A., Nikonov A.M., Rogovskii V.S., Stetsurin A.V. Using superhard tools in discontinuous cutting. Russian Engineering Research, 2009, vol. 29, no. 2, pp. 210-213.

5. Kudryashov E.A., Lunin D.Yu., Pavlov E.V. Preimushchestva lezviinoi tekhnologii obrabotki detalei instrumentom iz kompozita [Advantages of blade technology for machining parts with a composite tool]. Fundamental'nye i prikladnye problemy tekhniki i tekhnologii = Fundamental and applied problems of engineering and technology, 2011, no.5, pp. 77-80 (In Russ.).

6. Kudryashov E.A., Pavlov E.V., Yatsun E.I. at al. Obespechenie tochnosti otverstii pri remonte detalei mashin [Ensuring the accuracy of STI holes in the repair of machine parts]. Remont. Vosstanovlenie. Modernizatsiya = Repair. Recovery. Modernization, 2010, no.10, pp. 37-38 (In Russ.).

7. Carou D., Rubio E.M., Davim J.P. Discontinuous cutting: failure machanisms, tool materials and temperature studya review. Reviews on Advanced Materials Science, 2014, vol. 38, no. 2, pp. 110-124.

8. Kudryashov E.A., Pavlov E.V., Yatsun E.I. et al. Sposoby dostizheniya nadezhnosti raboty gidrotsilindrov vysokogo davleniya burovykh ustanovok [Ways of achieving reliability of operation of high-pressure hydraulic cylinders of drilling rigs]. Izvestiya Samarskogo nauchnogo tsentra Rossiiskoi akademii nauk = Proceedings of the Samara Scientific Center of the Russian Academy of Sciences, 2010, vol. 12, no.1-2, pp.401-403 (In Russ.).

9. Stahl J.E. Metal cutting - Theories and models. Lund, Lund University, 2012. 580 p.

10. Zhao D. et al. The application of SIT on the lunar rock drill. AEMT, 2015, pp. 789-793.

11. Kudryashov E.A., Altukhov A.Yu., Lunin D.Yu. et al. Kolichestvennaya otsenka protsessov v obrabotannom kompozitom poverkhnostnom sloe detalei mashin [Quantitative assessment of processes in the composite-treated surface layer of machine parts]. Izvestiya Volgogradskogo gosudarstvennogo tekhnicheskogo universiteta = Proceedings of Volgograd State Technical University. 2010, vol. 6, no. 12 (72), pp. 10-15 (In Russ.).

12. Kudryashov E.A., Altukhov A.Yu., Lunin D.Yu. et al. Tekhnologicheskie preimushchestva instrumental'nogo materiala kompozit pri obrabotke konstruktivno slozhnykh poverkhnostei [Technological advantages of the instrumental material composite when processing constructively complex surfaces]. Izvestiya VolGTU = Izvestia VolSTU, 2010, no.12, pp. 15-20 (In Russ.).

13. Kudryashov E.A., Smirnov I.M. Effektivnaya rabota instrumenta iz kompozita pri skorostnom frezerovanii rez'by [Efficient operation of a composite tool for high-speed thread milling]. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal processing (technology, equipment, tools), 2013, no. 2 (59), pp. 25-32 (In Russ.).

14. Kudryashov E.A., Altukhov A.Yu., Yatsun E.I. Effektivnaya rabota instrumenta iz kompozita v usloviyakh preryvistogo rezaniya [Effective operation of a composite tool under intermittent cutting conditions]. Fundamental'nye i prikladnye problemy tekhniki i tekhnologii = Fundamental and applied problems of engineering and technology, 2011, no. 6, p. 79 (In Russ.).