CALCULATION OF SHEAR ANGLE WHEN CUTTING WITH A TOOL OF A NEGATIVE RAKE ANGLE

Authors

DOI:

https://doi.org/10.20998/2078-7405.2022.97.05

Keywords:

cutting process, rake angle, chip shrinkage, iron-carbon alloys, relative plastic characteristics, shear angle

Abstract

The article considers the results of the study of the cutting process in order to obtain the calculated dependences of the shear angle oF the physical and mechanical properties of hard-worked iron-carbon steels and alloys in thermobaric conditions of the cutting process and the value of the negative rake angle which is a typical tool for processing with polycrystalline superhard materials (PSHM) cutting tools. When cutting, the formation of chips occurs in the plastic flow of metal in the area of cutting or fracture with the formation and subsequent development of cracks and the subsequent separation of elemental or stepped chips. A well-known chip shaping scheme with one plane shift and the value of the contact area of the front surfaces of the cutting elements with the allowable material to be removed are used to describe the contact phenomena in the chip forming zone and calculate the shear angle in this plane. It is established that the inverse relationship between the shear angle and the negative rake angle of the cutting element indicates that the increase in the negative value of the rake angle leads to a decrease in the shear angle. The specific elongation and shortening of the processed material at the cutting temperature are defined by the authors as the characteristics of shear plasticity and selected for use in the calculation of the values of shear angles during blade processing. As a result of this work, the calculated dependences of the shear angle values on the physical and mechanical properties of heavy-duty ferro-carbon steels and alloys in thermobaric conditions of the cutting process and the value of the negative rake angle, which is characteristic of machining with tools of PSHM equipped.

Author Biographies

Manovytskyi Oleksandr, V. Bakul Institute for Superhard Materials of NAS of Ukraine, Kyiv

Candidate of sciences (Ph.D), Senior Researcher, V. Bakul Institute for Superhard Materials of NAS of Ukraine, Kyiv, Ukraine

Dr. Klymenko Sergiy, V. N. Bakul Institute for Superhard Materials of the NAS of Ukraine 2, Avtozavodska Str., Кyiv, 04074

Deputy Director of Science, Corresponding Member of NAS of Ukraine, Dr. in Technical Science, Professor. V. N. Bakul Institute for Superhard Materials of the NAS of Ukraine 2, Avtozavodska Str., Кyiv, 04074

Burykin Vitalyi, V. N. Bakul Institute for Superhard Materials of the NAS of Ukraine 2, Avtozavodska Str., Кyiv, 04074

Candidate of sciences (Ph.D), researcher, V. N. Bakul Institute for Superhard Materials of the NAS of Ukraine, 2, Avtozavodska Str., Кyiv, 04074

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Published

2022-11-04

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Section

Mechanical processing of materials, the theory of cutting materials, mathematical and computer simulation of machining p