Robert Tomkowski

Robert Tomkowski
KTH Royal Institute of Technology | KTH · Department of Production Engineering (IIP)

PhD

About

36
Publications
12,358
Reads
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262
Citations
Citations since 2017
8 Research Items
204 Citations
2017201820192020202120222023010203040
2017201820192020202120222023010203040
2017201820192020202120222023010203040
2017201820192020202120222023010203040
Additional affiliations
May 2018 - present
KTH Royal Institute of Technology
Position
  • Senior Researcher
May 2015 - April 2018
KTH Royal Institute of Technology
Position
  • PostDoc Position
Description
  • The main goal of my research work is to discover relation between manufacturing processes parameters, surface parameters and microstructure of the material on to signal strength of the Barkhausen noise.
May 2015 - present
Scania
Position
  • Consultant
Description
  • NDT, metrology, surface evaluation
Education
October 2005 - December 2013
Koszalin University of Technology
Field of study
  • Metrology
October 2000 - October 2005
Koszalin University of Technology
Field of study
  • Mechanical Engineering

Publications

Publications (36)
Article
Full-text available
High-power impulse magnetron-sputtering thick metal/carbon–nitride-doped metal-matrix multilayer nano-composite coating can be applied to cutting-tool holder components to improve cutting insert’s life. One of the challenges of such an add-on solution is the poor adhesion between the thick coating and the hard alloy substrate, such as WC-Co shim. T...
Article
Full-text available
Friction control is a vital technology for reaching sustainable development goals, and surface texturing is one of the most effective and efficient techniques for friction reduction. This study investigated the performance of a micro-dimpled texture under varying texture densities and experimental conditions. Reciprocating sliding tests were perfor...
Preprint
Full-text available
Friction control is a vital green technology for reaching sustainable development goals, and surface texturing is effective and efficient at reducing friction. In this study, a novel preparation scheme involving dimpled groove texture is proposed. A pulsed laser marking system is used to make the dimpled grooves. Due to the unique design and proces...
Article
Hardness measurement is a vital step for quality assurance in manufacturing of a wide range of products. Today, the standard hardness measurement tests, such as Vickers, are based on microscope image-based evaluation methods. Since these methods are limited to the geometry of the indentation in 2D images, their precision are highly dependent on the...
Article
Full-text available
Controlling friction and wear are essential for reducing energy loss and lengthening the life span of friction pairs in sliding contacts. Surface texturing is an effective and efficient way to reduce friction and wear, especially under lubricated conditions. Dimple texture on friction pair surfaces has been verified to enhance the lubrication condi...
Article
Full-text available
Barkhausen noise testing (BNT) is a nondestructive method for investigating many properties of ferromagnetic materials. The most common application is the monitoring of grinding burns caused by introducing locally high temperatures while grinding. Other features, such as microstructure, residual stress changes, hardening depth, and so forth, can be...
Article
Full-text available
The use of artificial neural networks for modelling and inference about surface parameters is a more and more often undertaken research topic. Based on the analysis of the ranges of suitability of surface topography parameters, a variety of different parameters can be observed to identify surfaces with different features and different conditions of...
Conference Paper
Full-text available
Non-destructive testing of layer properties in machine part loading, has greatly improved over the last 20 years. One of those NDT methods is Barkhausen Noise Analysis (BNA). The BNA-method is utilized to assess changes in the surface layer of ferromagnetic materials, especially for monitoring changes in hardness and residual stresses. The BNA-meth...
Article
Polymer composites are composed of different materials that have been found to affect the different functional properties of the obtained products. One of the most interesting example in this field is wood-polymer composites (WPC), where the solid phase is composed of different origins and wood flour. Regardless of the dimensions of wood particles,...
Article
Full-text available
Background Termination of fixed orthodontic treatment is associated with bracket debonding and residual adhesive removal. These procedures increase enamel roughness to a degree that should depend on the tool used. Enamel roughening may be associated with bacterial retention and staining. However, a very limited data exists on the alteration of 3D e...
Research
Full-text available
prezentacja - problemy oceny i klasyfikacji topografii powierzchni
Article
Full-text available
After orthodontic treatment, brackets are debonded and residual adhesive is removed, causing iatrogenic enamel damage. The aim of this study was to review the methods of orthodontic adhesive removal, find clear evidence, and provide a rationale for this procedure. A literature search was performed in PubMed, Dentistry and Oral Sciences, Scopus, Coc...
Article
Full-text available
The article presents the scientific problems and development trends of abrasive micromachining. The research problems were characterized and the results of the analysis of research directions based on programs of implemented projects in the world's scientific centers were presented. The most important features of the abrasive micromachining were de...
Article
Full-text available
The article presents a comprehensive system to modeling and evaluation of technical surfaces topography allowing for cheap and full assessment of the geometric structure of the surface. The system consists of a large number (over 200) scripts, functions and applications, also with the graphical user interface (GUI). The system was developed using M...
Article
Full-text available
In the paper a methodology of neural modelling of grinding process using process simulation data was presented. Grinding process simulation parameters were chosen based on the results of the experiment. The experiment consisted of an analysis of the influence of processing parameters (allowance ae, table feed speed vft and table axial feed fa) on t...
Conference Paper
Full-text available
Accuracy of measurement data registration considerably influences on values of surface topography parameters. Obtaining high precision and therefore correct mapping of the evaluated surface is of great importance not only in case of determining surface roughness parameters but also its features, essential because of service reasons. The hereby work...
Article
Grinding is one of the basic precise material removal methods. Abrasive and shape wear, as well as smearing of the tools' active surface handicap the processing results. The loss of cutting capacity in abrasive tools or alteration of their shape influences the surface quality and precision of the workpiece dimensions and its shape. Evaluation of th...
Article
Full-text available
Residual stresses influence, among other parameters, on the performance characteristics of the machine, such as deformation, static and dynamic strength, material usage, or the strength of the contact. Extensional stresses as a result of abrasive machining reduce the fatigue strength for the dynamically loaded machine parts. It is preferred when th...
Article
Full-text available
One of the most important procedures in modern surface metrology is digital filtering. It is realized by many filters which are complicated mathematical tools for analysis of a wide variety of surface characteristics. In practice, filters are used among others for denoising, correcting the data obtained from measuring tools and displaying important...
Article
Full-text available
Nowadays, plastics have become one of the most demanded materials, replacing the traditional ones such as metals. Therefore, many companies are concerned with the production of plastics, with their distribution and innovation development. Plastics have found utility in a wide range of applications, we use them every day. Measurement of surface roug...
Chapter
Full-text available
Szlifowanie jest jednym z najczęściej stosowanych procesów obróbki dokładnej. Proces usuwania materiału następuje w wyniku oddziaływań wielu ziaren ściernych o zróżnicowanym rozmiarze i kształcie. Parametry kinematyczne oraz cechy geometryczne kontaktu ziarna i materiału obrabianego wpływają na efektywność oraz cechy energetyczne procesu [10]. W ty...
Article
Full-text available
Analysis of the geometric features and determination of the condition of the surfaces machined during an abrasive process is of crucial importance for evaluation of their wear properties. Numerous parameters can be used for assessing topography of technical surfaces. Many of them contain information that is general or poorly correlated with the wea...
Article
Grinding is one of the basic precise machining methods. Evaluation of the abrasive tool surface is the basic criterion of forecasting the tools' durability and the process results. The applied method of laser scanning made determination of the surface coordinates and subsequently of its geometric features with micrometric accuracy possible. Using t...
Article
Full-text available
This paper presents and discusses the proposed use of the Talysurf CLI 2000 system for performing high-accuracy measurements of the surface topography of abrasive tools. Specifically, the paper presents a brief description of the Talysurf CLI 2000 system (Fig. 1), as well as one of its modes of use, involving the chromatic aberration phenomenon. Th...
Article
Full-text available
In modern industry it is often required to improve the cleanliness and finish quality of surfaces of precise manufacturing parts. For this purpose, producers apply microfinishing [1], which permits to obtain the better quality than that obtained by different conventional finishing processes. This influences significantly the maintenance of proper o...
Article
Full-text available
In modern metrology of geometric quantities there are often used methods originally developed for other applications and used in separate fields of modern science and technology. For several years there has been increasing interest in methods of confocal microscopy related up to now to the medical and biological sciences. One of the modern variant...
Article
Full-text available
The increase in requirements for accuracy and properties of elements, minimisation of the wear of materials, mass and dimensions of elements, the increase in load capacity and endurance, and also the development of manufacturing technology, lead to the development of many measurement methods and equipment to carry them out as well as to increase th...
Article
Full-text available
The paper presents the method based on white light interferometry - SBI (Scanning Broadband Interferometry). SBI uses a correlation algorithm to find the coherence peak and phase position of an interference pattern produced by a selectable bandwidth light source. It provides both high resolution and excellent sensitivity of the returning light. Thi...
Article
Full-text available
The application of the theory of fuzzy sets lets on the qualitative evaluation of the surface on the basis of parameters of the geometrical structure of surface. Enlarges this the communicability of the evaluation of the structure of the geometrical surface which is not described exclusively by the series often confounding of many parameters. This...

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Projects

Projects (5)
Project
The goal is to have "control" over the coefficient of friction, thanks to the special surface preparation. Introducing a specific structure of indentations on a surface with different shapes and distribution affects inter alia: - Lower friction and lower surface wear, therefore longer component life - Wear particle trapping into dimples (reduce 3rd body abrasion) - Hydrodynamic lift, - Supplying additional lubricant inside the contact - Decreasing contact areas and increasing pressure - Enhanced adhesion (for coatings) - Improved stress isolation and no micro-cracking, - Lower self-vibration effect caused by starving lubrication, etc.
Project
Celem projektu było opracowanie innowacyjnych, hybrydowych narzędzi ściernych o budowie mikroagregatowej i podwyższonej porowatości, zapewniających zmniejszenie energii właściwej szlifowania, zwłaszcza w obróbce stopów metali lekkich, eliminację zjawiska zapychania przestrzeni między ziarnami warstwami obrabianego materiału oraz zapewniających możliwość wytwarzania ściernic o charakterystykach precyzyjniej dostosowanych do zadań technologicznych. Cel osiągnięto poprzez zastosowanie w budowie narzędzi kompozycji mikroagregatów ziaren o różnym składzie, mających jednocześnie zdolność wydajnej obróbki stopów metali lekkich i pozwalających na uzyskanie korzystnych cech stereometrycznych powierzchni oraz dobrych właściwości warstwy wierzchniej. Wynikiem tego projektu jest zarówno nowa technologia, jak i nowy produkt w postaci narzędzi ściernych.