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1
Content available remote Możliwość regulacji temperatury na stanowisku testowym do badania właściwości elastomerów
Stembalski M., Skoczyński W., Sandecki J., Roszkowski A., Preś P.
Mechanik
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2018
|
R. 91, nr 12
1116--1119
PL
Przedstawiono system kontroli i utrzymania temperatury w zbiorniku wykorzystywanym do testów zmęczeniowych elementów. Zaprojektowany system umożliwia osiąganie i utrzymanie stałej temperatury w zakresie od 17 do 45ºC z odchyłką ±0,5ºC. System kontroli temperatury został skonstruowany z zastosowaniem ogniw Peltiera oraz układu sterowania Arduino Uno.
EN
The system of control and maintenance of temperature in the tank used for fatigue tests of the elements is presented. The designed system enables reaching and maintaining a constant temperature in the range from 17 to 45ºC with a slope of ±0.5ºC. The temperature control system was implemented using the Peltier cells and the Arduino Uno control system.
2
Content available Modelling of a glass gatherer robot arm with a frictional damper
Stembalski M., Pres P., Skoczynski W., Turek P.
Journal of Machine Engineering
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2018
|
Vol. 18, No. 4
127--140
EN
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.
3
Content available remote Testing the vibration damping of a glass gatherer robot arm using a friction damper
Stembalski M., Skoczyński W., Roszkowski A., Preś P.
Archives of Civil and Mechanical Engineering
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2017
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Vol. 17, no. 2
240--248
EN
This paper describes a test stand along with a model of a lance used in glass works. A prototype friction damper was used for vibration damping of the lance. Experimental tests were conducted, whose aim was to determine operating conditions under which the damper will be the most effective. Damping was evaluated based on the damping decrement determined using the resonance curve for the first form of vibration of the lance. It was found that a friction damper has optimal values of preload force from the point of view of damping of the lance's resonant vibration.
4
Content available remote Zastosowanie czujnika optycznego ConoProbe MK 3.0 HD do pomiaru profilu powierzchni obrobionej
Preś P., Stembalski M., Turek P., Skoczyński W., Jankowski T.
Mechanik
|
2016
|
R. 89, nr 11
1688--1689
PL
Przedstawiono zastosowanie czujnika optycznego ConoProbe 3.0HD do szybkiego skanowania profilu 2D powierzchni wału po obróbce skrawaniem. Do przemieszczania głowicy pomiarowej wykorzystano napęd obrabiarki CNC. Zmierzony profil wykorzystano do oceny różnicy średnic tego wału oraz jego chropowatości. Zmierzone wartości odniesiono do wyników uzyskanych przy pomocy profilografometru firmy Taylor Hobson. W zależności od częstotliwości próbkowania sygnału badania wykazały rozbieżności rzędu 0,02 mm dla pomiaru średnicy wału oraz rozbieżności od 1 do 10 μm w ocenie chropowatości.
EN
Application of an optical sensor ConoProbe 3.0HD to quickly scan a 2D profile of the shaft after machining was described. The drive of CNC machine tool was employed to move the measuring head. The measured profile was used to assess the difference in diameters of the shaft and its roughness. The measured values were referred to the results obtained using profilographometer Taylor Hobson. Studies have shown differences in the shaft diameter assessment of the order of 0.02 mm, and in the assessment of roughness of 1 to 10 μm, depending on the sampling frequency.
5
Content available remote Stanowisko pomiarowe do wyznaczania charakterystyk zespołu śruba–nakrętka toczna podczas jego obciążania
Stembalski M., Skoczyński W., Roszkowski A., Turek P., Malicki M.
Mechanik
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2016
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R. 89, nr 11
1682--1683
PL
W celu pomiaru wielkości charakteryzujących warunki pracy mechanizmu zespołu śruba nakrętka toczna wykonano stanowisko dydaktyczne. Umożliwia ono wprowadzenie i pomiar napięcia wstępnego nakrętek, zadawanie obciążenia zewnętrznego, a także pomiar przemieszczeń nakrętek względem śruby i oporów ruchu. Umożliwa ono również określenie wartości maksymalnego obciążenia zewnętrznego, powyżej którego nastąpi otwarcie obciążanej nakrętki.
EN
In order to measure quantities characterizing the operating conditions of the mechanism an educational test stand was developed. It allows the introducing and measuring the preload of ball nuts, application of the external load, and measuring displacements of the nuts with respect to the screw and the resistance to motion. It allows also specify the maximum external load above which will open the nut.
6
Content available remote Sensory we współczesnych obrabiarkach sterowanych numerycznie
Skoczyński W., Stembalski M., Roszkowski A., Jankowski T., Turek P., Piórkowski P.
Mechanik
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2016
|
R. 89, nr 11
1740--1747
PL
Celem pracy jest przedstawienie postępów w dziedzinie zastosowań różnych sensorów w obrabiarkach sterowanych numerycznie. Omówiono współczesne napędy obrabiarek i układy pomiaru położenia. Wskazano na przyczyny monitorowania nowoczesnych systemów wytwórczych i opisano stosowane układy diagnostyki i nadzoru. Przedstawiono wybrane inteligentne rozwiązania mechatroniczne w dziedzinie obrabiarek, których celem jest ograniczenie różnego rodzaju błędów obróbki.
EN
The aim of the study was to present the progress in the application of a variety of sensors and mechatronic systems in numerically controlled machine tools. Modern machine tools drives and position measurement systems were discussed. The reasons for modern manufacturing systems monitoring were indicated and diagnostic and supervision systems employed in machine tools were described. Some selected intelligent mechatronic solutions in the field of machine tools whose aim is to reduce various types of machining errors were presented.
7
Content available Comparison of Methods for Adjusting and Controlling the Preload of Angular-Contact Bearings
Turek P., Skoczyński W., Stembalski M.
Journal of Machine Engineering
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2016
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Vol. 16, No. 2
71--85
EN
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.
8
Content available Finite Element Modelling of burr formation in metal cutting
Pres P., Skoczyński W., Stembalski M.
Journal of Machine Engineering
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2014
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Vol. 14, No. 2
27--37
EN
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.
9
Content available remote Determination of the friction coefficient as a function of sliding speed and normal pressure for steel C45 and steel 40HM
Stembalski M., Preś P., Skoczyński W.
Archives of Civil and Mechanical Engineering
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2013
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Vol. 13, no. 4
444--448
EN
This paper presents a method of determining the coefficient of friction as a function of sliding speed and normal pressure for different friction pairs of materials used in friction dampers. A schematic of the experimental setup is shown and the course of the experiment is described. An analytical relation describing the influence of sliding speed and normal pressure on the friction coefficient for C45 and 40HM steel was derived. Then on the basis of the analytical relation 3D numerical models were created. Computations using the Abaqus/Standard software package were performed.
10
Content available remote Badania eksperymentalne i modelowanie numeryczne mechanizmu odkształcenia materiału na krawędzi przedmiotu obrabianego
Preś P, Skoczyński W, Stembalski M
Mechanik
|
2012
|
R. 85, nr 8-9CD (SOS)
242--248
11
Content available Numerical model of fricional damper for glas – making robot lance
Stembalski M., Skoczyński W., Roszkowski A.
Journal of KONES
|
2012
|
Vol. 19, No. 1
391-398
EN
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.
12
Content available Sposoby ograniczenia zużycia energii przez obrabiarki skrawające do metali
Stembalski M.
Inżynieria i Aparatura Chemiczna
|
2010
|
Nr 5
107-108
PL
W artykule przedstawiono potrzebę oszczędności energii w przemyśle, ze względu na koszty i ochronę środowiska. Wyznaczono obszary występowania strat energii w obrabiarkach i systemach wytwórczych. Ponadto omówiono możliwości wpływania na redukcję zużycia energii. Opisano sposoby zmiany struktury obrabiarek, redukcję ruchomych mas w obrabiarkach oraz tzw. „dematerializację".
EN
Necessity of energy consumption reduction in the industry is presentee this paper. An area of machine tools' and production systems' energy we is determined and opportunities for its reduction are discussed. Methods machine tool structural change, movable mass reduction and so called materialisation are described.
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