Improving the Performance of Hard-Alloy Deforming Broaches Using Modified Technological Lubricants

Sheykin, S. Ye.; Rostotskyi, Igor; Protsyshyn, V. T.; Мельниченко, В. В.; Studenets, S. F.; Efrosinin, D. V.; Melnichenko, Ya. V.

doi:10.3103/s1063457620040085

Cited by 4 publications

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“…The low strain limit of cast iron indicates the necessity to carefully study the processes occurring in the deformation zone. It is known that the deformation zone in the DBR process consists of a contact zone with non-contact zones adjacent to it [2,3,8]. These zones can be a place of damage accumulation and reduction in plasticity margin.…”

Section: Methods For the Determination Of Plasticity Marginmentioning

confidence: 99%

“…Due to the tightness a i on each deforming element and the total tightness of the entire broach Σa i , the workpiece dimensions and the physical and mechanical characteristics of the machined surface are changed. Machining processes using DBR are successfully used to improve the geometric characteristics of the subsurface layer [2] and the friction surface quality of machine parts [3]. During machining in the contact area of the deformation zone, the stress-strain state (SSS) of the machined material is close to full compression [1].…”

Section: Introductionmentioning

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: 99%

Section: Introductionmentioning

confidence: 99%