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Testing of beveled crimp connections made on a prototype stand

Wróbel N., Rejek M., Królczyk B.

Archives of Mechanical Technology and Materials

2018

Vol. 38

15--22

The purpose of this study is to form and test inseparable tight joints, commonly used in the construction of heat exchangers, by crimping operation on designed prototype stand. Crimped joints are made by tools in form of cones with two types of shapes, each of the designed tools have got identical forming angle. This study uses two types of connecting blocks and plates, differing in diameters of hole and flange. Elaboration contains a case study of joints being made by the stand, which in addition to the crimping operations for some cases were glued or brazed. The article presents the features of the formed joints, by examining them by destructive testing: Micrography, tensile strength test, and non-destructive testing: Leakage test. The examined elements have been made of aluminum 6060, which is well suited to indirect or direct operations of forming joints for all kinds of coolers or condensers. Elaborated tests and studies in this study allowed to state, that joining the connection block to plate with the small diameter, was more energy-consuming than in sample sets with bigger diameter, use of glue increasing the strength of the joints by 20%, significant strength increase can be obtained after mechanical clinching with brazing operation or modification of geometrical shape of the jaws.

Palety jako istotny element łańcucha logistycznego

Wróbel N.

Logistyka

2014

nr 4

3793--3800

Od wielu lat jednostki ładunkowe stanowią podstawowy element każdego łańcucha logistycznego. Są one bowiem niezwykle istotne zarówno podczas przewozu, jak i czynności związanych z magazynowaniem. Rodzaj takiej jednostki może być dobierany w zależności od cech przemieszczanego towaru lub środka transportu którym jest on wieziony. Powyższy artykuł porusza temat palet ładunkowych. Główna uwaga została zwrócona na palety drewniane typu EUR, z uwzględnieniem podziału, a także systemów zarządzania ich obiegiem. Poruszana problematyka jest aktualnie głównym źródłem dyskusji i sporów pomiędzy użytkownikami wspomnianych nośników.

For many years load units are an essential element of each of the logistics chain. They are also very important both during transport, as well as activities related to storage. Type of the unit can be selected depending on the characteristics of the moving goods or transport. This article describes the subject of cargo pallets. The main attention was paid to the type of EUR wood pallets, including their classification, and systems to manage their workflow. Raised issues are currently the main source of discussions and disputes between the users of pallets.