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Geometrical parameters and strength of clinching joint formed with the use of an additional rivet

Mucha Jacek, Boda Łukasz, Witkowski Waldemar

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 2

art. no. e114, 2023

EN

In the publication, the results of an experimental analysis of joint formation by pressing of DX51D steel sheets with thickness of 1.5 (mm) with the use of a rigid punch and an additional deformable rivet of various shapes were presented. The influence of the use of a steel rivet with a diameter d = 5 (mm), similar to the dimensions of the forming punch in the case of the classic clinching variety on the interlock parameters was investigated. The used die was with a four movable segments-dedicated to connections made in the clinch-riveting technology by TOXR PRESSOTECHNIK. In additional, experimental tests were made for joining sheets with a rivet of various shapes, i.e. with a through hole. Joints were formed and the correctness of the upper blockage in the lower sheet was observed on the joints cross-sections. The interlock parameters were measured for each joints samples. In order to compare the influence of using an additional rivet on interlock parameters and joints strength the traditional clinching joints were also made. The minimal thickness of the traditional clinching joint embossment for 2 sheets of 1.5 (mm) thickness for each was X = 0.75 (mm).

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Single point incremental forming of Cu-Al composite sheets: A comprehensive study on deformation behaviors

Liu Zhaobing, Li Guohao

Archives of Civil and Mechanical Engineering

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2019

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Vol. 19, no. 2

484--502

EN

Compared with monolithic metal sheet, Single Point Incremental Forming (SPIF) of bimetal composite sheet has attracted increasing attention, as it takes advantages of materials with different superior properties, such as high strength, low density, and good corrosion resistance. However, deformation behaviors of bimetal composite sheet in SPIF may differ from the single-layer sheet, which depends on the layer arrangements and mechanical properties of each layer. In this regard, a comprehensive study was conducted to investigate the deformation behaviors of roll-bonded Cu-Al composite sheets in SPIF through predictive modeling, including analytical, empirical as well as numerical approaches, and extensive experimental work taking into consideration effects of key process parameters. It was demonstrated that overall, the formability, surface roughness, thickness variation and forming force in different layer arrangements, in terms of various process parameters, follow the similar trends to single-layer sheets. However, it was further revealed that deformation mode of layer-up sheet tends to a compression state and that of layer-down sheet tends to a stretching state. This leads to higher formability and larger forming force in Al/Cu layer arrangement compared to Cu/Al layer arrangement, as the exterior thinner but stronger Cu layer could endure more stretching deformation.

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Wpływ warunków przechowywania na siłę formowania jednostkowych opakowań tekturowych o różnych gramaturach

Mikołajczak A.

Przegląd Papierniczy

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2017

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R. 73, nr 8

535--538

PL

Trend prowadzący do obniżania gramatur tekturowych materiałów opakowaniowych, a tym samym do redukcji ilości generowanych odpadów, jest m.in. wyrazem troski o środowisko. Dodatkową korzyścią płynącą z tych działań są niewątpliwie oszczędności. Materiały o obniżonych gramaturach charakteryzują się jednak większą podatnością na zmiany właściwości zachodzących podczas ich przechowywania. W artykule przedstawiono badania porównujące zmiany sił formowania jednostkowych opakowań tekturowych wyprodukowanych z tektury o różnej gramaturze.

EN

In the interest of the environment and the aim of reducing the amount of generated waste, there is a trend towards lowering the grammages of packaging materials. The additional benefit of these activities is certainly the savings. Packaging materials with reduced weights are more susceptible to changes in properties during storage. The article presents comparative changes in the forming force of cardboard packages made of cardboard of different grammages during storage.