Autor: Skoczyński, W. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Finite Element Modelling of burr formation in metal cutting
Autorzy:: Pres, P.
Skoczyński, W.
Stembalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/99655.pdf
Data publikacji:: 2014
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: orthogonal cutting
burr
FEM simulation
Opis:: The paper presents a two-dimensional FEM model of burr formation in metal cutting. Abaqus/Explicit software was used for the build of the model. The workpiece geometry, the tool and the cutting parameters were modelled. Physical properties and the method of deformation and fracture of the workpiece material is described using Johnson Cook's constitutive law and the ductile damage criterion. The simulation of the edge formation process during orthogonal cutting was carried out for different depths of cut and cutting speeds. The results of these simulations allowed the verification of the FEM model. The components of the resultant cutting force measured during the actual cutting process with the values of these forces determined based on FEM simulation of this process were compared. The geometry of burrs formed during the actual and simulated the edge forming process was assessed. The analysis showed that the FEM model built enabled a correct prediction of the shape of the workpiece edge and the estimation of geometric features of the edge.
Źródło:: Journal of Machine Engineering; 2014, 14, 2; 27-37
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modelled phenomenon of burr formation during machining
Autorzy:: Preś, P.
Skoczyński, W.
Powiązania:: https://bibliotekanauki.pl/articles/248036.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: burr formation
cutting
finite element simulation
2D numerical model
Opis:: A model of burr formation on the edge of the workpiece in the course of machining is presented. The material being machined, the cutting tool and the machining parameters were modelled. Material properties and type of its deformations have been modelled with the use of a constitutive Johnson - Cook model. Material damage initiation criteria and associated damage evolution have been modelled with the use of the ductile damage and the Johnson- Cook damage initiation criterion. Simulations of the machining process for different depths of cut were carried out. The real burr formation presented by Hashimura was compared with the modelled one. The influence of the cutting parameters on the form and size of burr has been analysed. Calculations have been realised utilising finite element method with the use of nonlinear analysis in ABAQUS/Explicit environment. Based on simulation results, the assessment of the form and size of burr has been made. Burr height was used to evaluate its size, which was derived according to ISO 13715 standard. The goal was to obtain a model that reliably reflects the behaviour of material during machining, with particular emphasis on supporting the creation of cutting phenomenon of burr formation. The results of simulation and computational analysis confirmed that the model reflects the real behaviour of the material.
Źródło:: Journal of KONES; 2012, 19, 1; 333-338
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Modelling of a glass gatherer robot arm with a frictional damper
Autorzy:: Stembalski, M.
Pres, P.
Skoczynski, W.
Turek, P.
Powiązania:: https://bibliotekanauki.pl/articles/99808.pdf
Data publikacji:: 2018
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: numerical model
damping vibration
glass gatherer
robot
Opis:: A numerical model of a friction damper used for damping vibration in glass gatherer robots was described. The damper with a lance was modelled using finite elements. Primary natural frequency of the system was determined. Numerical calculations were performed to determine the best operating parameters of the damper for excitations using a impulse of a force. Results of the damping decrement calculations for the friction damper model with a constant coefficient of friction and for the model, in which the coefficient of friction varied depending on the sliding velocity and the normal pressure occurring at the contact surfaces of the damper’s friction rings, were presented. Based on numerical simulations, the values of relative displacements between the damper’s friction rings were also determined.
Źródło:: Journal of Machine Engineering; 2018, 18, 4; 127-140
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical model of fricional damper for glas – making robot lance
Autorzy:: Stembalski, M.
Skoczyński, W.
Roszkowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/247991.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: robot
vibration damping
friction damper
numerical model
damping decrement
Opis:: The need to design a friction damper for glass-making robots arose because of the excessive vibrations, which occur in the course of their work. The robots are commonly used in the manufacture of glassware. The vibrations adversely affect the work of ball gatherers, which results in a large number of defects in the finished glass products. As a result of the vibrations molten glass may become unevenly distributed on the ball's surface and as the material flows down the ball into the mould the thermal conditions of its solidification may change. It is proposed to damp the vibrations by means of a prototype friction damper mounted directly on the ball gatherer lance. The glass-making robot lance with the friction damper was modelled. The vibrations of the glass-making robot lance tip under static load and impact excitation were measured during simulations. Also the relative displacements of the damper rings in the course of the excitations were measured. Moreover, the dependence between the preload force and the system's damping decrement was determined. The main aim was to select proper operating parameters for the proposed structure in order to obtain maximum system damping.
Źródło:: Journal of KONES; 2012, 19, 1; 391-398
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Comparison of Methods for Adjusting and Controlling the Preload of Angular-Contact Bearings
Autorzy:: Turek, P.
Skoczyński, W.
Stembalski, M.
Powiązania:: https://bibliotekanauki.pl/articles/99739.pdf
Data publikacji:: 2016
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: preload
angular-contact bearings
machine tool
Opis:: The effect of preload on the operating conditions of angular-contact bearings is described. The interdependences occurring during mutual displacements of bearing rings at different bearing contact angles are discussed. The criteria of the classification into low-speed and high-speed angular-contact bearings are presented. Selected methods of preloading angular-contact bearings are compared and discussed. Their advantages and disadvantages with regard to the active control and adjustment of the bearing system during its operation are presented. The structure of a developed test stand with a spindle assembly is described. Preliminary measurements of the behaviour of the spindle assembly during operation are reported. Conclusions are drawn and the direction for further research is indicated.
Źródło:: Journal of Machine Engineering; 2016, 16, 2; 71-85
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Sterowanie układem zasilania i pomiar właściwości układu wrzecionowego z łożyskami skośnymi przy użyciu środowiska LabVIEW
Control supply system and measurement properties of spindle with angular contact bearings using LabVIEW
Autorzy:: Turek, P.
Skoczyński, W.
Powiązania:: https://bibliotekanauki.pl/articles/134728.pdf
Data publikacji:: 2016
Wydawca:: ADVSEO
Tematy:: preload
angular bearings
machine tool
LabVIEW environment
monitoring of spindle
speed control
Opis:: The paper presents a research position with the spindle-speed. It is used in the PhD thesis, the aim of which is to develop an active bearing case. This case is intended to provide the opportunity to actively change the preload of the spindle of ball angular contact bearings. The article describes the construction of the test and the parameters of both spindle and measurement systems. It shows the hardware configuration used for the initial measurements. These measurements will allow to determine the operating parameters of the spindle so that setting a real relationship changes the preload of the spindle for changing working conditions. For data acquisition and control software environment LabVIEW was used, its general philosophy is presented in the work. The authors also present the application created in this program which allows for simultaneous control of spindle speed and monitoring of selected parameters of its work.
Źródło:: Technical Issues; 2016, 3; 120-125
2392-3954
Pojawia się w:: Technical Issues
Dostawca treści:: Biblioteka Nauki

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