The influence of deformation conditions on the structure and hardening of cast iron surface layer in machining with combined carbide broaches

Studenets, S. F.; Eryomin, P. M.; Chernyavs’kyi, O. V.

doi:10.3103/s1063457615040085

Cited by 5 publications

(2 citation statements)

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“…At the same time, the machining of holes from low-plasticity materials, for example, cast irons, is difficult due to the lack of data on the ultimate plasticity of the machined material. Studenets with colleagues showed the presence of all-around compression conditions in the contact zone between a deforming element and a cast-iron workpiece [11]. This indicates the fundamental possibility and potentiality of cast iron product machining using the DBR method.…”

Section: Methods For the Determination Of Plasticity Marginmentioning

confidence: 93%

“…The stress-strain state in the contact zone of the deforming element with the cast iron workpiece, which is close to full compression conditions, prevents the brittle fracture of the machined material and ensures an increase in its plasticity [1,4,5]. Examples of cast iron parts successfully machined using the DBR method for a specific production task are known [11]. The analysis of methods for determining the plasticity margin showed that to assess the quality of the parts machined using DBR, the characteristic that determines the defectiveness of the surface layer is the plasticity margin [4] should be used.…”

Section: Methods For the Determination Of Plasticity Marginmentioning

confidence: 99%

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Plasticity Resource of Cast Iron at Deforming Broaching

Nemyrovskyi

Shepelenko

Storchak

2023

Metals

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The contact interaction mechanics of deformation broaching in low-plasticity materials is studied. Particular attention is paid to the study of the stress–strain state parameters and the plasticity margin in the deformation zone during the machining of gray cast iron EN-GJL-200. The stress–strain state was analyzed using a finite-element model of the deforming broaching process for each area of the deformation zone. The model parameters of the machined material were determined experimentally by compressing specimens of gray cast iron EN-GJL-200. The changes in the parameters of accumulated strain, stress tensor components, stress triaxiality ratio, hydrostatic stress, and plasticity margin at different deformation zones along the machined specimen depth are analyzed. It is shown that there is a zone of local plastic deformation in conditions of critical contact stresses. This leads to the appearance of tensile stresses that reduce the plasticity margin in the surface layer. The impact of tool geometry on the stress–strain state of the surface layer is also discussed, and recommendations for the optimal working angle of the deforming element are provided based on plasticity margin minimization.

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Section: Methods For the Determination Of Plasticity Marginmentioning

confidence: 93%