Wyniki wyszukiwania - Biblioteka Nauki

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Analityczny model procesu kształtowania cieczą rury warstwowej w matrycy

100%

Sadłowska H.

Hutnik, Wiadomości Hutnicze

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2021

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tom Vol. 88, nr 5-6

12--16

PL

W referacie przedstawiono metodę wytwarzania rur warstwowych, wykonanych z dwóch metalowych rur łączonych ze sobą przy użyciu cieczy pod wysokim ciśnieniem. Głównym celem tego opracowania było zaprezentowanie modelu matematycznego umożliwiającego określenie możliwości uzyskania łącza między rurami przy zastosowaniu parametrów wejściowych procesu. W celu weryfikacji zaprezentowanego modelu wybrane dane obliczeniowe modelu zostały zestawione z rezultatami z prób doświadczalnych przeprowadzonych na stanowisku badawczym TH do hydrostatycznego kształtowania cieczą. Porównanie to wskazuje na dużą przydatność opracowanego modelu w projektowaniu procesu kształtowania rury warstwowej przy użyciu cieczy pod ciśnieniem.

EN

This paper presents the method of manufacturing double layer tubes made of two metal tubes connected together by hydroforming. The main purpose of this paper was to present a mathematical model that allows to determine the possibility of obtaining a permanent linkage between tubes using input process parameters. As a verification of the presented analysis the selected model computational data were compiled with the results of the experimental tests carried out on the TH hydrostatic testing machine. The good agreement indicates the usefulness of the developed model in the design of the double layered tube process using hydroforming.

2

A Casting Mould for Rapid Tube Hydroforming Prototyping

63%

Kochański A. , Sadłowska H.

Journal of Casting & Materials Engineering

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2020

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tom Vol. 4, no. 2

29--33

EN

In recent years, hydroforming has clearly expanded its range of industrial applications due to the growing interest in products which combine high strength with low weight. A current limitation of this technology was its economically justified production volume since the costs of producing tools eliminates the possibility of using hydroforming technology in prototype and single part production. The paper presents a freshly patented solution that allows for single part hydroforming. The new technology combines traditional hydroforming machines with a new approach to tool production. The new rapid die is made quickly and cheaply. The use of materials known from the production of foundry moulds causes the die to deform during hydroforming, but it is a controlled deformation. Thanks to the use of numerical modelling, the deformation of the mould cavity is predicted and taken into account at the design stage. The article presents important issues that need to be considered in the design of this innovative process.

3

Application of the design of experiments and statistical hypothesis to reduce defects in the flange of the steel plate process

63%

Sadłowska H. , Wójcik P.

Computer Methods in Materials Science

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2022

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tom Vol. 22, No. 3

149--156

EN

The paper presents a discussion on the occurrence of defects in the circumferential flange of steel plate. The numerous flange face defects have been analysed. The types of defects have been selected and categorized using an experimental planning procedure involving 600 samples for 24 different process variants, considering variables such as material, hole diameter, tool size and tool position. The analysis of experimental results enabled to determine of the optimal values of process parameters to minimize the occurrence of defects. Furthermore, the influence of individual parameters on the quality of the flange surface has been carried out to obtain the process parameters’ impact using statistical hypotheses. As a result, it was possible to develop rules which will be helpful in the design process, especially important when changing the material to be processed.

4

Soft modelling of the shaping of metal profiles in rapid tube hydroforming technology

63%

Sadłowska H. , Kochański A.

Computer Methods in Materials Science

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2022

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tom Vol. 22, No. 4

201--210

EN

The paper presents an approach to the impact of process parameters in innovative RTH (Rapid Tube Hydroforming) technology for shaping closed metal profiles in flexible and deformable dies. In order to implement the assumed deformation of the deformed profile, the RTH technology requires the monitoring and control of numerous technological parameters, including geometric, material, and technological variables. The paper proposes a two-stage research procedure considering hard modelling (constitutive) and soft modelling (data-driven). Due to the complexity of the technological process, it was required to develop a numerical finite element method FEM model focused on obtaining the adequate profile deformation measured by the ellipsoidality of the cylindrical profile. Based on the results of the numerical experiments, a preliminary soft mathematical model using ANN was developed. Analysing the soft model results, several statistical hypotheses were made and verified to investigate the significance of selected process parameters. Thanks to this, it was possible to select the most important process parameters, i.e., the properties of moulding sands used for RTH dies: the angle of internal friction and cohesion.