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1

Use of the theory of similarity in the study of cutting tool wear

Bezyazychny V. F., Szczerek M., Nepomiluev V. V., Kiselev Z. W.

Tribologia

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2018

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nr 1

7--10

EN

The paper highlights the methods to define wear intensity of cutting tools using the theory of similarity. The dimensionless numbers of the cutting procedures, which are necessary in calculating cutting tool wear intensity, are defined with regard to the cutting conditions, cutting tool geometry, and the physico-mechanical properties of the work stock and the tool materials.

PL

W artykule przedstawiono metody określania intensywności zużywania narzędzi skrawających z wykorzystaniem teorii podobieństwa. Bezwymiarowe liczby dotyczące procesu skrawania, które są konieczne do obliczenia intensywności zużycia narzędzia tnącego, są wyznaczane w odniesieniu do warunków skrawania, geometrii narzędzia skrawającego i właściwości fizykomechanicznych materiałów obrabianych oraz materiału narzędzia.

2

Analysis of decrease machinability possible causes for claimed alloy

Náprstková N., Kuśmierczak S.

Advances in Science and Technology. Research Journal

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2016

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Vol. 10, nr 31

94--101

EN

The Faculty of Production Technology and Management is often asked by companies with a request to solve a specific technical task. One of these tasks was the analysis of aluminum alloy worsened machinability when the rods from this alloy exhibited against assumption significantly worse (longer) chips during machining. The alloy was complaint and, of course, it created economic damage. Obviously, the company was interested in the causes of this alloy behavior change that could possibly generate future complaints procedures to defend itself better, or to avoid mistakes in the production of the material. At the faculty analysis that could contribute to identifying the cause of the worsened machinability were done.

3

Traverse Grinding of X6CrNiMoTi Steel and its Final Surface Quality for Giving Cutting Conditions

Naprstkova N., Novak M., Hricova J.

Production Engineering Archives

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2015

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Vol. 7, No. 2

49--52

EN

Machining of stainless steels is often an important used technology. Products made from these materials are often used in mechanical engineering and the quality of workpiece surface roughness after machining respective grinding is one of the important parameters that illustrates the quality of the machining process. This paper deals with the influence of cutting conditions when grinding steel X6CrNiMoTi (EN ISO) on the machined quality surface (roughness, circularity). Grinding of samples was carried out by feed grinding and the measured values were analyzed. On the machined samples parameters were all monitored and measured in the laboratory of precision measurements at the Faculty of Production Technology and Management of Jan Evangelista Purkyně University in Ústí nad Labem and the devices Hommel tester T1000 and Hommel tester Form 1000 were used. Measuring was done according to ČSN EN ISO 4287.

4

Investigation of the cusp height when ball-end milling from shaped surfaces

Stahovec J., Beňo J., Vrabel' M.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

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2013

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z. 85[288], nr 2

187--196

EN

This paper presents a model for cusp height in the ball-end milling process. In many milling operations, the cutting tool performs step over and makes adjacent cuts to complete machining of any feature. As a result, a small cusp of material, called a cusp height, will remain between these cuts on the surrounding walls or on the machined surface if a ball-end mill is used. This procedure presents application of software to evaluate cusp height in milling process. The height of cusp is examined in surfaces having different curvature ratio and different orientation. The model for the mathematical prediction of the cusp height has been developed in terms of axial and radial depth of cut, surface curvature and tool diameter. The application of the DOE technique by Taguchi gives the process parameter values that lead to the minimum machining time and achievement of the desired surface texture.

PL

W pracy przedstawiono model wysokości śladu obróbkowego w procesie obróbki frezem palcowym o zarysie kulistym. W wielu operacjach frezowania narzędzie wykonuje stopniowe ruchy, tworząc przylegające do siebie ślady obróbkowe. W rezultacie, jeżeli obróbka odbywa się frezem palcowym o zarysie kulistym, po obróbce pozostają małe występy materiału na krawędziach sąsiednich śladów obróbkowych. Procedura ta przedstawia zastosowanie oprogramowania do oceny wysokości zarysu śladu obróbkowego w procesie frezowania. Wysokość występów jest badana na powierzchniach mających różny wskaźnik krzywizny i różną orientację. Opracowano matematyczny model do przewidywania występów obróbkowych w odniesieniu do osiowych i promieniowych głębokości skrawania, krzywizny powierzchni i średnicy narzędzia. Zastosowana technika DOE Taguchiego wyznacza wartości parametrów procesu, które prowadzą do najkrótszego czasu obróbki i osiągnięcia pożądanej tekstury powierzchni.

5

Definition of abrasive water jet cutting capacity taking into account abrasive grain properties

Buchacz A., Stepanov Y., Barsukov G., Mikheyev A.

Selected Engineering Problems

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2013

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nr 4

158--162

EN

The authors of the paper obtained dependences for the definition of abrasive water jet cutting capacity taking into account abrasive grain properties permitting choosing optimal cutting conditions.

6

Engineering support of performance characteristics of high-reliability products parts

Bezyazychny V. F., Kozhina T. D.

Scientific Problems of Machines Operation and Maintenance

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2012

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Vol. 47, nr 2

13--23

EN

The paper deal with the methods used to assign cutting technological conditions providing the set-up parameters of surface layer quality in the cutting operation and used in the calculation estimation of the indices of product performance characteristics based on certain parameters of surface layer quality and cutting conditions. There is the necessity for critical machine parts to provide the required performance characteristics determined both through the part precision parameters and through their surface layer quality (roughness, degree and depth of cold working, and the value and sign of residual stresses). In such cases, it is necessary to provide the complex parameters that characterize the surface layer along with the specified machining accuracy. For this propose, the methods and appropriate software have been developed that enables one to define the correlation between the machining conditions and the surface layer quality parameters, including cutting accuracy, properties of the cutter and work stock materials, technological system rigidity, the part`s dimensions.

7

Optimization software optimad for determinatioin of machining parameters and modeling of cutting process

Gecevska V., Kuzinovski M.

Systems : journal of transdisciplinary systems science

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2004

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Vol. 9, No. sp. I

16--21

EN

This paper proposes a methodology for optimization and analyzing machining conditions by optimal determination of the cutting parameters in multipass NC machining operation. The proposed approach for selecting optimal cutting parameters, where the formulation involves the use of empirical relations, is considered. A new optimization approach is proposed which uses a possibility formulation of the classical optimization problem and optimizes the resulting mathematical model using a classic (deterministic) and heuristic (genetic algorithm) method.

8

The need for catalogue machining data adjustment to the local operating features.

Przybylski L., Słodki B.

Postępy Technologii Maszyn i Urządzeń

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1999

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Vol. 23, nr 4

91-97

EN

The paper presents the local operating conditions influence on tool life in turning. The set of factors called by the authors "local operating conditions" causes the significant difference between the calculated and actual tool life. Some illustrated examples od research work in light roughing and finishing turning have been presented. The authors pointed out a method of dealing with the described problem.

PL

W pracy przedstawiono problem wpływu lokalnego środowiska obróbki na okres trwałości ostrza do toczenia. Wpływ zespołu czynników nazwanych przez autorów warunkami lokalnymi powoduje, że rzeczywisty okres trwałości ostrza często znacząco się różni od wartości oczekiwanej przy zadanych na podstawie rekomendacji katalogowych parametrach obróbki. Przedstawiono przykładowe wyniki badań w zakresie obróbki średnio dokładnej i wykańczającej zilustrowane histogramami i zdjęciami płytek skrawających. Wskazano metodę doboru parametrów obróbki uwzględniającą wpływ warunków lokalnych.