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Designing and researching of the equipment for cutting by breaking of rolled stock

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Abstract

The aim of the work is designing of the new schemes of cut-to-length workpieces of rolled stock and equipment for their implementation. A special construction of the equipment for cutting by breaking of rolled stock has been designed. The energy accumulated into hydro press at the expense of elastic deformation of the machine frame and the drive is used for effective work, namely, application of stress concentrator for cutting by breaking the next workpiece. Mathematical model for indentation of the wedge tool with different form has been designed. Dependences for calculation of energy-power parameters of the process of stress concentrator application have been found. Experimental studies of indentation of the wedge-shaped tool with different forms into the sample confirmed the adequacy of the proposed mathematical models. Calculating errors within 5–10% is related to the need for a more correct choice of the value of sliding friction coefficients. Calculations for steel C 20 (0.2% of the carbon) with triangular stress concentrator show that the amount of accumulated energy of elastic deformation of the machine frame and the drive of hydraulic press will be enough for application of the effective stress concentrator for cutting by breaking the next workpiece (taking into account the bluntness of the cutting edges of the wedge knife).

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Abbreviations

x 0 :

Traverse stroke of the hydraulic press

H :

Cutting stroke (indentation depth)

l 1 :

Load application shoulder during breaking of the rolling according to the console scheme

l :

Length of the cut workpiece

xi, yi :

Coordinates of the corresponding singular points: A, B, C, D, E, N, K

A ENK :

Triangle area defining the volume of the displaced metal

L ij :

Lengths of the respective segments: NA, NB, BA, CB, CA, DA

α :

Half-angle of the top of a double-sided wedge knife

ϕ :

Angle at the top of the centered mesh

γ :

Angle of approach of the DA characteristics to the contact surface of the deforming tool

Θ:

Angle of approach of the leg LDE to the horizon

K :

Shear yield strength

τ :

Tangential contact stresses

k :

Number of the next cycle of solution iterative procedure

A L :

Changing step of the segment length

:

Sign function corresponding to the sign of the calculated geometric coordinate of the point E

σ АDЕ :

Mean stress in the ADE region

σ АО :

Pressure along the contact line AО

σxE, σyE :

Normal stresses

F i :

Indentation force of the tool

μ :

Coefficient of plastic friction

R :

Radius of the workpiece

L i :

Half-width of the area indentation

σ T :

Yield strength

σ В :

Tensile strength

НВ :

Brinell’s hardness

δ%:

Elongation

γ%:

Relative narrowing

h :

Height of the wedge, cone and pyramid

B, L :

Width and length of the wedge base

D :

Diameter of the cone base

S :

Side of the pyramid base

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Authors and Affiliations

  1. Basics of Designing a Machine, Donbass State Engineering Academy, Akademichna Str., 72, Kramatorsk, 84313, Ukraine

    Sergii G. Karnaukh

  2. Computerized Design and Modeling of Processes and Machines, Donbass State Engineering Academy, Akademichna Str., 72, Kramatorsk, 84313, Ukraine

    Oleg E. Markov & Leila I. Aliieva

  3. Metal Forming Department, Pryazovskyi State Technical University, Universytetska str., 7, Mariupol, 87555, Ukraine

    Volodymyr V. Kukhar

Authors
  1. Sergii G. Karnaukh
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  2. Oleg E. Markov
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  3. Leila I. Aliieva
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  4. Volodymyr V. Kukhar
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Correspondence to Oleg E. Markov.

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Karnaukh, S.G., Markov, O.E., Aliieva, L.I. et al. Designing and researching of the equipment for cutting by breaking of rolled stock. Int J Adv Manuf Technol 109, 2457–2464 (2020). https://doi.org/10.1007/s00170-020-05824-7

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  • DOI: https://doi.org/10.1007/s00170-020-05824-7

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