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1

Hydroforming process of thin-walled tubular components with multiple local bulges

Cui Xiao-Lei, Guo Ju, Zhao Yuanyang, Lin Peng

Archives of Civil and Mechanical Engineering

|

2023

|

Vol. 23, no. 3

art. no. e169, 2023

EN

In the hydroforming process of a thin-walled tubular component with multiple local bulges, the bulge in the middle position is almost impossible to be formed with a conventional one-step hydroforming process because of the difficult axial feeding. To solve this problem, a novel method is proposed by preforming wrinkles using selective induction heating at different positions of tube blank to aggregate materials in advance for the subsequent hydroforming of tubular component with multiple local bulges. In this paper, the wrinkling behavior of 5052 aluminum alloy tube blank under different conditions and the deformation behavior of the wrinkled tube blank in subsequent hydroforming process of tubular component with three bulges are analyzed. It is shown that the existence of wrinkles is beneficial to increase the ultimate expansion ratio of the tube blank. Moreover, the instability behavior of multiple wrinkles on 5052 aluminum alloy tube blanks under different conditions was investigated by experiments. The process parameters for prefabricating two or three wrinkles, including temperature, spacing between wrinkles, and internal pressure, were determined through a detailed experimental investigation. Finally, the defects including splitting and undercut that occur in the hydroforming of tubular component with three bulges are analyzed, and the thin-walled tubular component with three bulges was hydroformed successfully using a wrinkled tube blank obtained under the process parameters of 250 °C, 4 mm, 5.5 MPa/350 °C, 10 mm, 2 MPa/400 °C, 6 mm, 1.33 MPa. These results provide insights for the manufacturing of tubular component with multiple local bulges from hard-to-form materials.

2

Analityczny model procesu kształtowania cieczą rury warstwowej w matrycy

Sadłowska Hanna

Hutnik, Wiadomości Hutnicze

|

2021

|

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.

3

Analysis of thickness variation and stress state in hydroforming of complex T-shaped tubular part of nickel-based superalloy

Cui Xiao-Lei, Yuan Shijian

Archives of Civil and Mechanical Engineering

|

2021

|

Vol. 21, no. 3

458--471

EN

Stress states on a multi-branch tubular part are the most complicated change in all types of hydroforming process, which result in severe variation of thickness. In this paper, an experimental and numerical research was conducted on a multi-step hydroforming process including intermediate annealing treatment to obtain effect of stress state on the thickness variation of a superalloy GH4169 complex T-shaped tubular part with expanded diameter, which corresponds to a real product used in aerospace industry. The material flow behavior at typical points on hydroformed tube blank was first analyzed. Then, the thickness variation on the hydroformed GH4169 tube blanks was discussed in every step. It is shown that the materials have different flow directions to form the side branch, where the thickness is always thinned during the four-step hydroforming process. Large axial feeding induces a continuous thickening between transition areas and tube ends. The thickness invariant dividing line in the side branch zone moves toward the tube ends with forming going on. However, in the hemisphere zone, it moves slightly towards the center of the side branch. Moreover, the stress states at three typical positions, as well as their effect on the thickness variation, were analyzed based on a sequential correspondence law between stress and strain components. On this basis, the mechanism of thickening in the left transition area, thinning at the top of side branch and thickness variation at the hemispheric pole was revealed. These results are very important for obtaining the thickness distribution of a complex T-shaped tubular part in multi-step hydroforming, and revealing the thickness variation mechanism by using engineering plasticity theory.

4

A Casting Mould for Rapid Tube Hydroforming Prototyping

Kochański Andrzej, Sadłowska Hanna

Journal of Casting & Materials Engineering

|

2020

|

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.

5

Rozwój innowacyjnych sposobów kształtowania materiałów metalicznych metodami tłoczenia cieczą

Hyrcza-Michalska Monika

Hutnik, Wiadomości Hutnicze

|

2020

|

Vol. 87, nr 1-2

25--28

PL

W pracy przedstawiono przykłady wprowadzania ulepszeń i zastosowania innowacyjnych rozwiązań w zakresie metod kształtowania hydromechanicznego blach i rur. Przedstawiono metodę flexforming – kształtowania cieczą wyrobów tłoczonych przez wyginanie i obciąganie blach na wzornikach za pośrednictwem membrany elastomerowej. Metodę flexforming porównano z klasycznym kształtowaniem cieczą – hydroforming. Ponadto przedstawiono przykłady aplikacyjne kształtowania cieczą wytłoczek z materiałów wysokowytrzymałych. Wykazano, że dobrą praktyką przemysłową jest wykorzystanie wspomagania komputerowego i symulacji numerycznej w projektowaniu wyrobów tłoczonych, operacji tłoczenia oraz wzorników i narzędzi do realizacji hydromechanicznego kształtowania. Tym samym możliwe staje się projektowanie produkcji w tłocznictwie z wykorzystaniem innowacyjnych rozwiązań.

EN

The paper presents examples of introducing improvements and the use of innovative solutions in the field of sheet metal and tubes hydromechanical forming. The flexforming method was presented - liquid forming of products pressed by bending and dressing sheets on templates using an elastomeric membrane. The flexforming method was compared with classic liquid forming - hydroforming. In addition, application examples of liquid forming drawpieces made of high-strength materials are presented. It has been shown that good industrial practice is the use of computer-aided and numerical simulation in the design of stamped products, stamping operations as well as templates and tools for the implementation of hydromechanical forming. Thus, it becomes possible to design production in the press industry using innovative solutions.

6

Strain Measurements in Free Tube Hydroforming Process

Sadłowska H., Morawiński Ł., Jasiński C.

Archives of Metallurgy and Materials

|

2020

|

Vol. 65, iss. 1

257--263

EN

The paper presents a method of measuring deformations of cylindrical samples on the testing machine for free tube hydroforming experiments. During experiments a sample made of a thin-walled metal tube is expanded by the internal pressure of the working liquid and additionally subjected to axial compression. This results in a considerable circumferential deformation of the tube and its shortening. Analysis of the load cases and their impact on the deformations can be helpful in determining e.g. tube material properties or general limiting conditions in the tube hydroforming process. In connection with the above, the value of deformations and knowledge of their course during experiment has become one of the most important problems related to the issue described above.

7

Physical and Numerical Modeling of the Manufacturing Process of a Complex Shape Pressed Element from a Nickel Superalloy

Hyrcza-Michalska M.

Archives of Metallurgy and Materials

|

2020

|

Vol. 65, iss. 1

215--218

EN

Products of complex geometry, aerodynamic shape and high quality surface finishes are among the most difficult to produce by using stamping methods. When additionally materials with special properties are intended, the task of determining their technological character becomes difficult to solve without the use of physical and numerical methods of process modeling. The paper presents the results of modeling the process of producing a single tube of the jet engine tubular diffuser subassembly. This is a product representative of such a complex geometry one. The charge material for this element requires resistance to operating conditions at elevated temperature and high durability. Therefore, an Inconel type nickel superalloy was proposed for the charge material. In the solution of designing the method of producing a single diffuser tube task, the capabilities of the AutoGrid automatic strain analyzer and the FEM simulation software Eta/Dynaform 5.9 were combined. Numerical simulations of different variants of the manufacturing process of the diffuser tube were made using the Eta/Dynaform 5.9 software. The results of forming simulations became the basis for the alternative technological cycle design of this drawpiece.

8

The Analysis of Microhardness Variations of Hydroformed P265TR1 Steel Axisymmetric Elements from Tubes

Miłek T.

Archives of Foundry Engineering

|

2020

|

Vol. 20, iss. 3

74--78

EN

The paper discusses the effect of upsetting ratio on distribution of the microhardness in longitudinal sections of hydroformed axisymmetric elements made from P265TR1 steel. The experimental research of hydroforming was carried out at a special stand which included a press with tooling and a hydraulic feeding system of oil. The measurements of microhardness were taken with a MATSUZAWA MMT-X3 Vickers hardness tester at a load of 100 g. The samples used in the tests were prepared from tube segments with a thin-wall ratio of 0.045. In the experiment, steel components were formed at upsetting coefficients of 0.07 and 0.09. For an established course of pressure and upsetting force, a series of steel components with exact representation of the die-cavity was formed. The paper provides a comparison of the microhardness distributions in three zones of longitudinal sections of axisymmetric elements at different degrees of material deformation. The greatest values of microhardness occurred in the area of cap for components at an upsetting coefficient 0.09.

9

Exhaust system piping made by hydroforming: relations between stresses, microstructure, mechanical properties and surface

Kucharska Barbara, Moraczyński Oskar

Archives of Civil and Mechanical Engineering

|

2020

|

Vol. 20, no. 4

648--658

EN

The subject of research is car exhaust system piping made of chromium–nickel steel of grade AISI304L with a unique, complex shape that was obtained by hydroforming technology. The purpose of the research was to determine the relation between the microstructure features, surface condition, hardness and the stresses on the external surface as determined by the sin2ψ X-ray method. We found that the stresses were tensile and correlated with the steel hardness, i.e. they were greater where the hardness was higher. Moreover, longitudinal stresses showed a relationship with pipe wall thickness, while circumferential stresses did so only partially. According to our data, the greatest value of stress determined in the pipe amounted to 290 MPa, and was close to the yield point of the strain hardened 304L steel. As depicted via XRD and SEM examination, the pipe stress level and hardness were influenced by the transition γ→α’. Furthermore, in the region of higher stress and hardness, the amount of martensite was 10 vol.%. We also noted that the pipe’s outer surface when subjected to friction against the die shows lesser roughness compared to its inner surface upon exposure to water under pressure.

10

Identification of surface stress in the exhaust system pipe made by hydroforming technology based on diffractometric measurements

Kucharska Barbara

Eksploatacja i Niezawodność

|

2019

|

Vol. 21, no. 4

562--566

EN

In the work identificaton of surface stresses in the exhaust pipe made of Cr-Ni steel shaped with hydroforming technology. Stresses were determined by the non-destructive x-ray method sin2ψ. A complex state of tensile stresses with values in the range of 69÷240 MPa for circumferential stresses and 26÷290 MPa for longitudinal stresses was found on the surface of the pipe. The distribution of stresses on the circumference and length of the pipe was analyzed on the basis of coefficients of variation and wall thickness. A relationship was found between the value of surface stress and the wall thickness of the pipe. The highest stresses occurred in the areas of the pipe where the thickness of the wall was reduced the most. In the central part of the pipe, where the wall thickness reduction was the smallest, the stresses were also the smallest, but they were characterized by the highest dispersion of value. The distribution of surface stresses determined by diffractometric method was compared with the model of deformation of the pipe generated numerically.

PL

W pracy dokonano identyfikacji naprężeń powierzchniowych w rurze wydechowej ze stali Cr-Ni kształtowanej technologią hydroformowania. Naprężenia wyznaczono nieniszczącą rentgenowską metodą sin2ψ. Na powierzchni rury stwierdzono złożony stan naprężeń rozciągających o wartościach z zakresu 69÷240 MPa dla naprężeń obwodowych i 26÷290 MPa dla naprężeń wzdłużnych. Rozłożenie naprężeń na obwodzie i długości rury analizowano na podstawie współczynników zmienności i grubości ścianki. Stwierdzono zależność pomiędzy wartością naprężeń powierzchniowych a grubością ścianki rury. Największe naprężenia występowały w obszarach rury gdzie grubość ścianki była najsilniej zredukowana. W centralnej części rury gdzie redukcja grubości ścianki była najmniejsza naprężenia również były najmniejsze, ale cechowały się największym rozproszeniem wartości. Rozłożenie naprężeń powierzchniowych wyznaczonych metodą dyfraktometryczną porównano z modelem odkształceń w rurze wygenerowanym numerycznie.

11

Effects of superimposed hydrostatic pressure on bulging deformation and fracture of tubes in double-sided hydroforming

Cui Xiao-Lei, Yuan Shi-Jian

Archives of Civil and Mechanical Engineering

|

2019

|

Vol. 19, no. 2

569--583

EN

Finite element analysis and scanning electron microscope were conducted to investigate the bulging deformation and fracture of tubes in double-sided hydroforming. The effect of the external pressure imposed on the tube, which determines the magnitude of superimposed hydrostatic pressure, on the stress state, yield locus, fracture surface formation, and fracture strain was evaluated. The simulation results revealed that sufficiently high external pressure can change the stress state of the tube in double-sided hydroforming from an in-plane biaxial tensile stress state to a three-dimensional stress state, and it can increase its hydrostatic pressure in a superimposed manner. Moreover, double-sided free bulging and corner filling experiments were conducted on 5A02 aluminum alloy and 2A12 aluminum alloy tubes. It was found that the external pressure has a significant impact on the fracture behavior of these tubes. The increasing external pressure could change the type, number, size, and proportion of the dimples on the fractured surface, and transform the fracture mode from a void accumulation fracture to a pure shear fracture, which significantly improves the fracture limit of the tubes. These results are significant for the consolidation of the theoretical and numerical simulation prediction of the superimposed hydrostatic pressure effect in the hydroforming process.

12

Analityczny model procesu kształtowania cieczą rury warstwowej w matrycy

Sadłowska H.

Przegląd Mechaniczny

|

2018

|

nr 4

25--29

PL

W artykule 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 z zastosowaniem 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.

13

The effect of laser welding on properties of stainless steel and prediction its formability by numerical simulation

Evin E., Tomas M.

Hutnik, Wiadomości Hutnicze

|

2018

|

Vol. 85, nr 10

341--343

EN

The paper deals with laser welding and its influence on the strength and plastic properties of stainless steel AISI 304 and AISI 430. The microstructure of samples laser welded by solid state fiber laser YLS-5000, made of stainless steel sheets with thickness 0,7 mm were researched. The effect of laser power and welding speed on the mechanical properties were measured by tensile test on specimens with weld in longitudinal direction. Microstructure of laser weld, heat affected zone and base material was analysed on perpendicular direction to laser weld by light microscopy. As it has been found, only the minor effect of laser welding on the mechanical properties of the stainless steel AISI 304 was found. Otherwise, the major effect of laser welding on the mechanical properties of the stainless steel AISI 430has been recorded. Applied formability of stainless steels was researched by numerical simulation of hydroforming of fuel tank.

PL

Artykuł dotyczy spawania laserowego i jego wpływu na wytrzymałość i właściwości plastyczne stali nierdzewnej AISI 304 i AISI 430. Dokonano analizy mikrostruktury próbek zgrzewanych laserem włókna stałego YLS-5000 wykonanego z blach ze stali nierdzewnej o grubości 0,7 mm. Wpływ mocy lasera i szybkości spawania na właściwości mechaniczne mierzono w próbach rozciągania na próbkach ze spoiną w kierunku wzdłużnym. Mikrostrukturę połączenia laserowego, strefy wpływu ciepła i materiału podstawowy analizowano w kierunku prostopadłym do spawania za pomocą mikroskopu świetlnego. Stwierdzono jedynie niewielki wpływ spawania laserowego na właściwości mechaniczne stali nierdzewnej AISI 304. Natomiast odnotowano znaczący wpływ spawania laserowego na właściwości mechaniczne stali AISI 430. Odkształcalność stali nierdzewnej zbadano za pomocą numerycznej symulacji hydroformowania.

14

Technologie wytwarzania półfabrykatów wałków rozrządu do silników okrętowych

Panasiuk K.

Zeszyty Naukowe Akademii Morskiej w Gdyni

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2017

|

nr 100

152--163

PL

W artykule podjęto kwestię wytwarzania półfabrykatów wałków rozrządu do silników okrętowych. Wyjaśniono pojęcia oraz przekazano istotę technologii kucia. Scharakteryzowano kucie swobodne i matrycowe oraz maszyny i narzędzia stosowane w tym procesie technologicznym. Opisano też sposoby odlewania wałków rozrządu i wytwarzania półfabrykatów, ich modelowania za pomocą właściwych obrabiarek i nowych technologii – hydroforming.

EN

The paper presents the production of semi-finished camshafts for marine engines. It explains the concept and shows the essence of forging technology. Hammer forging and stamping as well as machines and tools used in this process are characterized. The article also describes methods of casting camshafts and production of semi-finished products, their modeling using appropriate slicers and new technology – hydroforming.

15

Research on Liquid Forming Process of Nickel Superalloys Thin Sheet Metals

Hyrcza-Michalska M.

Archives of Metallurgy and Materials

|

2017

|

Vol. 62, iss. 4

2355--2358

EN

The paper presents the study of drawability of thin sheet metals made of a nickel superalloy Inconel type. The manufacturing process of axisymmetric cup – cone and a closed section profile in the form of a circular tube were designed and analyzed. In both cases, working fluid-oil was used in place of the rigid tools. The process of forming liquid is currently the only alternative method for obtaining complex shapes, coatings, and especially if we do it with high-strength materials. In the case of nickel superalloys the search for efficient methods to manufacture of the shaped shell is one of the most considerable problems in aircraft industry [1-5]. However, the automotive industries have the same problem with so-called advanced high-strength steels (AHSS). Due to this, both industrial problems have been examined and the emphasis have been put on the process of liquid forming (hydroforming). The study includes physical tests and the corresponding numerical simulations performed, using the software Eta/Dynaform 5.9. Numerical analysis of the qualitative and quantitative forecasting enables the formability of materials with complex and unusual characteristics of the mechanical properties and forming technology. It has been found that only the computer aided design based on physical and numerical modeling, makes efficient plastic processing possible using a method of hydroforming. Drawability evaluation based on the determination of the mechanical properties of complex characteristics is an indispensable element of this design in the best practice of industrial manufacturing products made of thin sheet metals.

16

A Simplified Approach for the Hydro-forming Process of Bi-metallic Composite Pipe

Zheng M., Gao H., Teng H., Hu J., Tian Z., Zhao Y.

Archives of Metallurgy and Materials

|

2017

|

Vol. 62, iss. 2A

879--883

EN

In this article, it aims to propose effective approaches for hydro-forming process of bi-metallic composite pipe by assuming plane strain and elastic-perfectly plastic material model. It derives expressions for predicting hydro-forming pressure and residual stress of the forming process of bi-metallic composite pipe. Test data from available experiments is employed to check the model and formulas. It shows the reliability of the proposed model and formulas impersonally.

17

Research on inner surface of hydroformed tubes

Ceclan V. A., Grozav S. D., Kuric I.

Advances in Science and Technology. Research Journal

|

2017

|

Vol. 11, no 4

311--317

EN

In this paper a reserch regarding the surfece of hydroforming tubs, made by aluminium and cooper is presented. Tube hydroforming is very important production method considering that metal tubes are widely used in a great variety of engineering products, such as automobile, aircraft, air conditioner, air compressor, exhaust systems, fluid lines. The results show that the surface of tubes it is influence of the hydroforming process. the material of the tube in research of surface is also very important.

18

Hydroformowanie wysokowytrzymałych blach stalowych dla motoryzacji

Grajcar A.

Stal, Metale & Nowe Technologie

|

2015

|

nr 3-4

28--31

PL

Ograniczenie emisji produkowanych przez samochody spalin do otoczenia wiąże się ściśle z ograniczeniem masy karoserii samochodów. Nowoczesne koncepcje nadwozi i podwozi wytwarzane ze stali wysokowytrzymałych z grupy AHSS wymagają zastosowania nowoczesnych technik kształtowania plastycznego, np. hydroformowania blach i elementów rurowych, które pozwalają na uzyskanie elementów karoserii o skomplikowanym kształcie. Zastosowanie hydroformowania eliminuje m.in. konieczność wykorzystywania dodatkowych wzmocnień, co zmniejsza masę elementu i ogranicza potrzebę stosowania technik spawalniczych.

EN

The reduction of the emission of exhaust gases produced by cars is strictly related to the decrease of the weight of their body-in-white structures. Modern concepts of the bodies and chassis manufactured of high-strength steels of the AHSS group require to use advanced forming techniques. These methods include sheet hydroforming and tube hydroforming, which enable to obtain body-in-white elements of a complicated shape. The use of hydroforming eliminates the need to apply additional reinforcement parts. It decreases the weight of elements and reduces the need to apply joining methods.

19

Prediction Accuracy of Failure Criteria in FE-analyses of Hydroforming Processes

Hartl C., Radetzky M.

Machine Dynamics Research

|

2014

|

Vol. 38, No. 4

69-77

EN

Simulations of tube hydroforming processes require a reliable prediction of the occurrence of plastic instabilities, which are limiting the maximum feasible expansion of the formed tube. To determine the onset of necking, as one of the important instabilities in hydroforming, the use of forming limit diagrams is a well-established practice. This method was initially developed for sheet metal forming processes and is commonly applied also for hydroforming, in spite of the fact that the prediction accuracy depends on the strain path at the analysed position of the formed component. To establish according forming limit diagrams, experimental as well as theoretical techniques exist. Ductile fracture criteria, based on the calculation of forming-history-dependent damage values and considering the development of continuum variables such as stress and strain, are alternative methods of failure prognostication and appealing because of their simplicity. Against the background to obtain an information about the quality in failure prediction of theoretically determined forming limit diagrams and damage-value-based methods for hydroforming component design, an evaluation of , selected examples, of these methods was conducted using simulations with the finite element method. To enable a reliable comparison with experiments, published results of aluminium tube hydroforming were taken where load paths for the forming operation were applied which resulted in a predominantly constant strain ratio at the point of maximum expansion. It was found that the investigated criteria resulted in different prognostication for the onset of plastic instability.

20

The wall thickness distributions in longitudinal sections hydromechanically bulged axisymmetric components made from copper and steel tubes

Miłek T.

Journal of Achievements in Materials and Manufacturing Engineering

|

2014

|

Vol. 65, nr 1

20--25

EN

Purpose: The paper presents experimental results that concern hydromechanical bulging of copper and P265TR1 steel axisymmetric component whose relative wall thickness was s0/D=0.04 (where s0 is the wall thickness and D is outer diameter of tube segments). Design/methodology/approach: The basic parameters of the hydromechanical process of bulge forming are: liquid pressure and axial loading. The process is employed while manufacturing pipe connections, including axisymmetric components. Copper pipe connections are used in hydraulic, heating, gas and waste water systems. The technology involves placing a tube segment in a die-cavity, pouring some liquid over it, and sealing the faces. Findings: The experimental investigations, described in the paper, on hydromechanical bulge forming of copper and P265TR1 steel axisymmetric component with the ratio h/d1=0.67 (where h is height and d1 is diameter of spherical cup) aimed to compare the wall thickness distribution in longitudinal sections of axisymmetric components. Besides it, the aim of experimental inwestigations was to compare patterns of pressure changes and force at relative displacement up to ∆l/l0=0.06. Research limitations/implications: The results obtained in the experiment might be used as guidelines to develop a technological process for manufacturing such type of connections with the method of hydromechanical bulge forming. They also could be helpful while applying the method to industrial practice. Originality/value: The experimental investigations, described in the paper aimed to determine the possibility of hydromechanical bulge forming of axisymmetric components made from copper and steel tubes, compare force waveforms at the constant upsetting ratio, compare distribution of wall thickness.