Wyniki wyszukiwania - Biblioteka Nauki

1

Application of selected balancing methods for analysis and evaluation of the working efficiency of the assembly line on the example of a selected product

100%

Antosz K. , Kluz R.

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tom nr 1

23--29

EN

Economic development requires from production companies to use more and more effective production methods. The growing demand for goods requires from them to reduce the lead time and to produce products of the best quality and competitive price. One of the problems of production lines is their proper balance. Balancing the production line consists in finding the optimal order of performed operations and assigning operations to individual operations in such a way, that work on positions is comparable. In this way, it is strive to minimize machine downtime and to distribute the work evenly between them. In the work, the performance analysis of the assembly line was made on the example of a selected product using three methods of balancing: the experimental method, the RPW (Ranked Positional Weight) heuristic method and SPT (Shortest Processing Time) method. The obtained results were analyzed and solutions were proposed to improve the work of the line.

PL

Rozwój gospodarczy wymaga od przedsiębiorstw produkcyjnych stosowania coraz to bardziej efektywnych metod produkcyjnych. Rosnący popyt na towary wymaga od nich zmniejszenia czasu potrzebnego na produkcję wyrobów o jak najlepszej, jakości i konkurencyjnej cenie. Jednym z problemów linii produkcyjnych jest ich prawidłowe zbalansowanie. Balansowanie linii produkcyjnej polega na znalezieniu optymalnej kolejności wykonywanych operacji oraz przypisaniu czynności poszczególnym operacjom w taki sposób, aby praca na stanowiskach była porównywalna. Dąży się w ten sposób do zminimalizowania czasów przestoju maszyn oraz do jak najbardziej równomiernego rozłożenia pracy pomiędzy nimi. W pracy wykonano analizę wydajności pracy linii montażowej na przykładzie wybranego wyrobu z wykorzystanie trzech metod balansowania: metody doświadczalnej, metody heurystycznej RPW (ang. Ranked Positional Weight) oraz metody SPT (ang. Shortest Processing Time). Dokonano analizy uzyskanych wyników i zaproponowano rozwiązania pozwalające na usprawnienie pracy linii.

2

Analysis of the Possibilities of Improving the Selected Properties Surface Layer of Butt Joints Made Using the FSW Method

80%

Bucior M. , Kluz R. , Kubit A. , Ochał K.

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tom Vol. 14, no 1

1--9

EN

The paper presents the results pertaining to an analysis on the influence of technological parameters of pneumatic shot peening technology on the selected properties of a surface layer of butt joints made with Friction stir weld‑ ing (FSW) method. Butt joints made of two 2024‑T3 aluminum alloy sheets with the thickness of 1 mm were shot peened with glass beads. The experiments were carried out according to the statistical 3‑level completed plan PS/DC 32 . The technological parameters were changed in the range: pressure p = 0.4–0.6 MPa and peening time t = 1–3 min. As a result of the conducted research, adequate equations describing the effect of the analyzed parameters on the surface roughness were obtained. Shot peening with glass beads significantly reduced the sur‑ face roughness from Ra = 5.2 µm to Ra = 1.42 µm. This treatment provides high compressive residual stresses and the increase of the surface layer hardness. The results show that shot peening is a highly efficient and cost‑effective mechanical treatment used for improving the mechanical properties of the butt joints made with the FSW method.

3

Effect of Nanofillers on the Mechanical Properties of Vinyl Ester Resin Used as a Carbon Fiber Reinforced Polymer Matrix

71%

Kubit A. , Bucior M. , Kluz R. , Ochałek K. , Burnat K.

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tom Vol. 16, no 4

10--21

EN

This article presents the results of research aimed at determining the influence of selected nanofillers of vinyl ester resin on the mechanical properties of the cured resin. The influence of the resin with nanofillers as a matrix on the properties of the unidirectional CFRP composite was also investigated. Graphite, silicon oxide and titanium dioxide nanopowders were used as resin nanofillers. Each of the fillers was considered in two different contents, i.e. 1 wt.% and 2 wt.%. The variants with such nanofillers content were compared with the unfilled reference variant. The uniaxial tensile strength tests of the resin samples were carried out, showing the possibility of increasing the strength by 19.35% for the variant 1 wt.% of silica nanopowder content. For CFRP composites, the possibility of increasing the strength in the three-point bending test by 25.57% due to the use of a matrix reinforced with graphite nanopowder with a content of 1 wt.% was demonstrated. Based on the analysis of fracture surfaces performed using SEM microscopy, it was shown that the fillers used lead to a significant improvement in the adhesion of the matrix to the composite fibers.