CALCULATION OF SHEAR ANGLE WHEN CUTTING WITH A TOOL OF A NEGATIVE RAKE ANGLE
Keywords:cutting process, rake angle, chip shrinkage, iron-carbon alloys, relative plastic characteristics, shear angle
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.
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