Technological Heredity of the Turning Process

The paper presents studies aimed at analyzing the influence of the change in feed rate and the cutting speed of the longitudinal turning process on the parameters of roughness, roundness and cylindricity of the machined surface. For selected surfaces, a comprehensive 3D surface topography study was carried out Form Talysurf 1200 PGI contact profilometer by Taylor Hobson. Five different materials were used for the studies: general purpose carbon steel C45, alloy steel S355, cold working tool steel NC6, brass MO58 and aluminum alloy AW-2017A. In addition, Pearson\u27s linear correlation coefficients were calculated in order to quantify the relationship between the analyzed parameters. Based on the results obtained, the analysis of technological heredity of the longitudinal turning process was carried out. It has shown that the technological parameters of the longitudinal turning process have a significant influence on the roughness parameters of the machined surface

Influence of bearing raceway surface topography on the level of generated vibration as an example of operational heredity

356-364In this paper, an influence of surface topography of ball rolling bearing raceways of the vibration values has been examined. Experiments have been preferment using series of bearing types 6304. Surface topography of bearing raceways has been measured using a stylus profilometer Talysurf PGI 1230. The 2D and 3D roughness and waviness parameters have been analyzed. The vibration measurements of ball rolling bearings have been carried out using a measuring device “Anderonmeter”. The concept of technological heredity and operational (exploitation) heredity in the aspect of production and operation of rolling bearings has been presented. Based on experimental study, an operation heredity analysis of ball bearings has been carried out. It has shown that the condition of surface texture of rolling bearing raceways directly affects the values of vibration generated by bearing units

Influence of bearing raceway surface topography on the level of generated vibration as an example of operational heredity

In this paper, an influence of surface topography of ball rolling bearing raceways of the vibration values has been examined. Experiments have been preferment using series of bearing types 6304. Surface topography of bearing raceways has been measured using a stylus profilometer Talysurf PGI 1230. The 2D and 3D roughness and waviness parameters have been analyzed. The vibration measurements of ball rolling bearings have been carried out using a measuring device ―Anderonmeter‖. The concept of technological heredity and operational (exploitation) heredity in the aspect of production and operation of rolling bearings has been presented. Based on experimental study, an operation heredity analysis of ball bearings has been carried out. It has shown that the condition of surface texture of rolling bearing raceways directly affects the values of vibration generated by bearing units

Dimensional and Shape Accuracy of Foundry Patterns Fabricated Through Photo-Curing

This paper deals with the potential use of the PolyJet Matrix (PJM) technology and digital materials to fabricate foundry patterns. The primary purpose of the study was to assess the dimensional and shape accuracy of additively manufactured objects by determining the draft angle as well as the roundness, waviness and roughness parameters. The experiments were conducted for cylindrical samples printed using VeroWhite liquid polymer resin. The analysis focused on the relationship between the build direction and the geometry and surface finish of prints. Three different orientations, i.e. 0º, 45º and 90º, were considered. The surface texture analysis involved comparing the statistical, graphical and numerical data, including calculation results obtained with the wavelet transform method. The findings confirm that the build direction has a significant effect on the dimensional and shape accuracy of prints and that the PJM technology can be used to fabricate precise foundry patterns, especially in investment (lost-wax) casting

Quality of surface texture and mechanical properties of PLA and PA-based material reinforced with carbon fibers manufactured by FDM and CFF 3D printing technologies.

The paper presents the results of mechanical tests of models manufactured with two 3D printing technologies, FDM and CFF. Both technologies use PLA or PA-based materials reinforced with carbon fibers. The work includes both uniaxial tensile tests of the tested materials and metrological measurements of surfaces produced with two 3D printing technologies. The test results showed a significant influence of the type of technology on the strength of the models built and on the quality of the technological surface layer. After the analysis of the parameters of the primary profile, roughness and waviness, it can be clearly stated that the quality of the technological surface layer is much better for the models made with the CFF technology compared to the FDM technology. Furthermore, the tensile strength of the models manufactured of carbon fiber-enriched material is much higher for samples made with CFF technology compared to FDM

Tribological Properties of Medical Material (MED610) Used in 3D Printing PJM Technology

The development of modern manufacturing technologies related to the ongoing industrial revolution Industry 4.0, is largely related to the dynamic development of materials chemistry. This means that currently 3D printing technologies allow the production of physical models using newer materials with better properties and application in new industrial sectors. The article presents the results of tribological tests of the bio-medical material under the trade name MED610, which shows biocompatibility for medical and dental purposes. The paper presents the results of measurements of tribological models of samples designed and manufactured in the shape of rings. Using the variable friction parameters, the wear process was described in the pressure-rotational speed (P-V) system. Moreover, the friction coefficient and wear measured by using the linear method were analyzed. The paper also presents a metrological analysis carried out with the application of an optical profilometer on the surface of the samples after pressing at the contact point of the surface during the test. The preliminary review of the test results showed that the MED610 material exhibited relatively good abrasion resistance. However, it cannot be employed for heavily loaded friction nodes, and in the PV diagram even at a relatively small value, the sample models were destroyed

Quality of surface texture and mechanical properties of PLA and PA-based material reinforced with carbon fibers manufactured by FDM and CFF 3D printing technologies

The paper presents the results of mechanical tests of models manufactured with two 3D printing technologies, FDM and CFF. Both technologies use PLA or PA-based materials reinforced with carbon fibers. The work includes both uniaxial tensile tests of the tested materials and metrological measurements of surfaces produced with two 3D printing technologies. The test results showed a significant influence of the type of technology on the strength of the models built and on the quality of the technological surface layer. After the analysis of the parameters of the primary profile, roughness and waviness, it can be clearly stated that the quality of the technological surface layer is much better for the models made with the CFF technology compared to the FDM technology. Furthermore, the tensile strength of the models manufactured of carbon fiber-enriched material is much higher for samples made with CFF technology compared to FDM.Web of Science1311art. no. 167

Konferencja uzgodnieniowa: problemy żywieniowe w polskiej onkologii

Polskie Towarzystwo Onkologiczne i Polskie TowarzystwoOnkologii Klinicznej podjęły inicjatywę wprowadzeniasystematycznych badań i opracowania polskichzaleceń dotyczących odżywiania i leczenia żywieniowegow profilaktyce i leczeniu nowotworów złośliwych

Konferencja Uzgodnieniowa: Problemy żywieniowe w polskiej onkologii

Z inicjatywy Polskiego Towarzystwa Onkologicznego i Polskiego Towarzystwa Onkologii Klinicznej powołano Grupę Roboczą, której zadaniem jest dokonanie oceny obecnego stanu poradnictwa i leczenia żywieniowego w polskiej onkologii, wskazanie kierunków działania i stworzenie podstaw organizacyjnych dla wprowadzenia tematyki żywieniowej do szkolenia onkologów i praktyki leczenia przeciwnowotworowego w Polsce. Podczas pierwszego spotkania Grupy Roboczej dokonano oceny obecnego stanu poradnictwa i leczenia żywieniowego w polskich ośrodkach onkologicznych, a następnie określono zagadnienia wymagające podjęcia działań oraz sposoby ich wdrażania. Niniejszy dokument stanowi podsumowanie ustaleń Grupy Roboczej

Multi-Dimensional Mathematical Wear Models of Vibration Generated by Rolling Ball Bearings Made of AISI 52100 Bearing Steel

The paper features the development of multi-dimensional mathematical models used for evaluating the impact of selected factors on the vibration generated by 6304ZZ type rolling ball bearings from three manufacturers in the aspect of the wear process. The bearings were manufactured of AISI 52100 bearing steel. The analyzed factors included the inner and outer raceways’ roundness and waviness deviations, radial clearance and the total curvature ratio. The models were developed for vibration recorded in three frequency ranges: 50–300 Hz, 300–1800 Hz and 1800–10,000 Hz. The paper includes a specification of the principles of operation of innovative measuring systems intended for testing bearing vibration, raceway geometries and radial clearance. Furthermore, it features a specification of particular stages of the multi-dimensional mathematical models’ development and verification. Testing with the purpose of statistical evaluation of the analyzed factors is also presented. The test results and mathematical models indicate that the inner raceway’s waviness deviation had a dominant impact on the vibration examined in all frequencies. The roundness and waviness deviation of bearing raceways made of AISI 52100 steel propagates the bearing wear process