Wyniki wyszukiwania - BazTech

1

Nitowanie bezotworowe blach miedzianych – wybrane aspekty

Cacko R., Goliński J., Czyżewski P.

Przegląd Spawalnictwa

|

2018

|

R. 90, nr 2

45--49

PL

Metoda bezotworowego nitowania blach swój rozwój zawdzięcza głównie zmieniającym się wymaganiom w przemyśle motoryzacyjnym ze względu na zastosowanie nowych materiałów, zwłaszcza na elementy karoserii, i konieczności ich efektywnego łączenia. Obserwowane tendencje do stosowania w konstrukcjach elementów lekkich, a przy tym wytrzymałych, wykonanych ze stopów aluminium, kompozytów, tworzyw sztucznych itd., są tego przykładem. W referacie zaprezentowano wybrane aspekty prób zastosowania procesu nitowania bezotworowego do łączenia blach miedzianych. Zastosowano opracowaną wcześniej procedurę modelowania numerycznego procesu tworzenia połączenia i jego obciążania. Analizy numeryczne zostały zweryfikowane eksperymentalnie przy wykorzystaniu przemysłowego stanowiska badawczego wykorzystującego specjalny przyrząd wyposażony w zaprojektowany tor pomiarowy. Do symulacji wykorzystano komercyjne oprogramowanie ogólnego przeznaczenia MSC.Marc, służące m.in. do modelowania zjawisk o charakterze nieliniowym. Zaprezentowane wyniki mają charakter jakościowy i stanowią początek działań podejmowanych w ramach współpracy z firmą produkcyjną, mającej na celu optymalizację oraz opracowanie wewnętrznych wytycznych do projektowania połączeń blach miedzianych.

EN

The self-piercing riveting – SPR – for sheet metal joining owes its development mainly to the changing requirements of the automotive industry due to the use of new materials, especially for the body parts, and the need for their efficient joining. The observed trends to use for the structural components lightweight, yet durable, aluminum alloys, composites, plastics, etc., are examples of this tendency. The paper presents selected aspects of the attempts to use the SPR method for joining copper sheets. A numerical modeling of the process of joint formation and its loading was introduced. These analysis were verified experimentally using an industrial set-up consisting of a mobile unit for riveting equipped with a specially designed components for a measuring track settting. Simulation were carried out with commercial software based on the finite element method MSC.Marc, dedicated for the nonlinear analysis. The presented results are of a qualitative nature and are the beginning of activities undertaken in cooperation with the production company, aimed at optimizing and developing internal guidelines for the design of copper sheet joints.

2

Joining by upset bulging – tooling design and new concepts for online process control using servo presses and local heating

Sviridov A., Grützner P., Rusch M., Bambach M.

Journal of Machine Engineering

|

2017

|

Vol. 17, No. 1

78--87

EN

Conventional fusion-welding techniques pose limitations in modern multi-material assemblies due to the heat input. The negative influence of the heat-affected zone on the material properties must be avoided particularly in high-strength steels. During mechanical joining processes, which may also be used for joining of different materials e.g. steel and aluminium, high-performance joints can be produced without degradation of the material properties. Joining by upset bulging is an innovative joining method based on plastic buckling of tubes under axial compression. In previous investigations of joining by upset bulging the process parameters were determined and joints of tubes with sheet metal were tested under static and dynamic loads. The results of these studies have shown that the process of upset bulging has a large potential for the production of joints of tubes with sheets and plates. The present paper focuses on the tooling concepts for an efficient use of the technology and describes methods to control the forming and joining process. Two aspects are covered: (i) the application of servo-presses for joining by upset bulging and their possibilities for on-line process control, (ii) a moderate, process-integrated local heating of the forming area to avoid the formation of cracks and to further increase the strength of the joints.

3

Experimental Study on the Riveted Joints in Glass Fibre Reinforced Plastics (GFRP)

Bielawski R., Kowalik M., Suprynowicz K., Rządkowski W., Pyrzanowski P.

Archive of Mechanical Engineering

|

2017

|

Vol. LXIV, nr 3

301--313

EN

The aim of the paper is to validate the use of measurement methods in the study of GFRP joints. A number of tests were carried out by means of a tensile machine. The studies were concerned with rivet connection of composite materials. One performed two series of tests for two different forces and two fibre orientations. Using Finite Element Method (FEM) and Digital Image Correlation (DIC), strain maps in the test samples were defined. The results obtained with both methods were analysed and compared. The destructive force was analysed and, with the use of a strain gauge, the clamping force in a plane parallel to the annihilated sample was estimated. Destruction processes were evaluated and models of destruction were made for this type of materials taking into account their connections, such as riveting.

4

Nitowanie bezotworowe. Alternatywna metoda łączenia blach

Cacko R.

Stal, Metale & Nowe Technologie

|

2015

|

nr 5-6

137--140

PL

W artykule przedstawiono jedną z technik łączenia mechanicznego, zwaną nitowaniem bezotworowym (self – piercing riveting – SPR), stosowaną do łączenia blach. Wspomniano o pierwszych zastosowaniach, czynnikach wpływających na rozwój metody, porównano wybrane własności połączeń nitowanych z uzyskiwanymi na drodze innych metod łączenia. Nakreślone zostały cechy uzyskiwanych połączeń, wady i zalety metody analizy własności połączeń wynikające z różnorodności elementów układu nit – blachy – matryca.

EN

In the article one of the mechanical joininig techniques applied mainly for sheets – self-piercing riveting – is presented. Brief history of development, first applications and patents, factors affecting evolution of the method are recalled. Signal comparison between specified properties of the SPR and other joining techniques most commonly used in the industry, especially automotive, are introduced. The methods of the SPR joint formation analysis and quality assessment are described. The main components of the joint stack-up: rivet – sheets – die are examined.

5

The structure of the strength of riveted joints determined in the lap joint tensile shear test

Mucha J., Witkowski W.

Acta Mechanica et Automatica

|

2015

|

Vol. 9, no. 1

44--49

EN

The article presents the analysis of the structure of the load capacity of riveted joints. For the four joining systems the lap joint specimens were made and tested in the shearing test. The joints were prepared for the three combinations of the DC01 steel and EN AW- 5754 aluminium alloy sheets with the thickness of 2mm. On the basis of the obtained load-elongation diagram tensile shear test curves, the basic parameters defined in the ISO/DIS 12996 standard were determined. In the case of the conventional riveted joints the maximum load capacity of the joint is determined by the strength of the fastener. For the joints with aluminium-steel blind rivet , the load capacity of the joint was on the strength limit of the rivet tubular part and on the strength limit of the sheet material. The strength of the SSPR joint is determined by the mechanical properties of the material of the joined sheets. From all sheets and rivet specimens arrangements the highest load capacity of the joint was obtained for the DC01 sheet material joints, and the lowest load capacity of the joint was obtained for the EN AW-5754 sheet material joints.

6

Overview on the state of development and the application potential of dieless mechanical joining processes

Neugebauer R., Todtermuschke M., Mauermann R., Riedel F.

Archives of Civil and Mechanical Engineering

|

2008

|

Vol. 8, no 4

51-60

EN

In the course of ongoing development of mechanical joining technologies, different technologies were developed in the last years, where often the necessary die as contrary die was substituted by a flat anvil. Using the example of dieless clinching, the full potential of such process alternatives is visible. If the tools, as the punch or the blank-holder are modified and the necessary die is substituted by a fiat anvil, then several advantages for the process alternative - the dieless clinching - emerges. For example, it is possible to produce a one-sided flat connection, which is not producible with any other joining technology. Additionally it is possible to enlarge the application potential of mechanical joining technologies as for example semi-finished parts made of magnesium can be partially heated and directly joined without an increase in process time or a reduction in the process stability. The tool's costs, the necessary tolerances and the tool wear are significantly reduced. The publication includes an overview over the state of the development and the application potential with practical examples of differcnt process alternatives.

PL

Publikacja zawiera przegląd rozwoju i potencjalnego zastosowania mechanicznego łączenia z praktycznymi przykładami. Obecnie intensywnie rozwijane są różne technologie mechanicznego łączenia, gdzie matryca jako przeciwstempel (wypychacz) została zastąpiona przez płaskie kowadło. Używając bezmatrycowego klinczowania, pojawia się kilka korzyści dla alternatywnych procesów, na przykład możliwe jest wyprodukowanie jednostronnych płaskich połączeń. Dodatkowo zastosowanie technologii mechanicznych połączeń może zostać rozszerzone na elementy z magnezu, które mogą zostać częściowo podgrzane i bezpośrednio połączone. Koszty narzędzi i ich zużycie jest znacząco mniejsze niż w innych metodach łączenia.