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This study investigates the problem of material fracture in cross wedge rolling (CWR). It was found that this problem could be analysed by means of well-known phenomenological criteria of fracture that are implemented in commercial FEM (Finite Element Method) simulation programs for forming processes. The accuracy of predicting material fracture depends on the critical damage value that is determined by calibration tests in which the modelled and real stresses must be in good agreement. To improve this accuracy, a new calibration test is proposed. The test is based on the CWR process. Owing to the shape of the tools and test piece used in CWR, the forming conditions in this process deteriorate with the distance from the centre of the test piece, which at a certain moment leads to fracture initiation. Knowing the location of axial crack initiation in the specimen, it is possible to determine the critical value of material damage via numerical simulation. The new calibration test is used to determine the critical damage of 42CrMo4 steel subjected to forming in the temperature range of 900–1100 °C. In addition, 12 criteria of ductile fracture are employed in the study. The results show that the critical damage significantly increases with the temperature.
Zbigniew Pater; Andrzej Gontarz; Janusz Tomczak; Tomasz Bulzak; Łukasz Wójcik. Determination of the Critical Value of Material Damage in a Cross Wedge Rolling Test. Materials 2021, 14, 1586 .
AMA StyleZbigniew Pater, Andrzej Gontarz, Janusz Tomczak, Tomasz Bulzak, Łukasz Wójcik. Determination of the Critical Value of Material Damage in a Cross Wedge Rolling Test. Materials. 2021; 14 (7):1586.
Chicago/Turabian StyleZbigniew Pater; Andrzej Gontarz; Janusz Tomczak; Tomasz Bulzak; Łukasz Wójcik. 2021. "Determination of the Critical Value of Material Damage in a Cross Wedge Rolling Test." Materials 14, no. 7: 1586.
Magnesium alloys are highly strain rate sensitive and exhibit good workability in a narrow forging temperature range. Consequently, parts made of these materials are usually forged with low-speed hydraulic presses, using specially designed tool heating systems in order to ensure near-isothermal conditions. This study investigates whether popular magnesium alloys such as Mg-Al-Zn can be forged in forging machines equipped with high-speed forming tools. Experimental upset forging tests on AZ31B, AZ61A and AZ80A specimens were conducted, using a screw press with a ram speed of 0.5 m/s and a die forging hammer with a ram speed at stroke of about 5 m/s. Test specimens were preheated to 350 °C, 410 °C and 450 °C. After the upset forging process, they were air- or water-cooled and then examined for their workability, hardness and grain size. To validate the results, a forging process for a producing handle was designed and modelled by the finite element method. Distributions of strain, temperature and fracture criterion were analysed, and energy and force parameters of the forging process were calculated. After that, experimental tests were performed on AZ31B and AZ61A specimens in order to determine mechanical properties of forged parts and examine their micro- and macrostructure. Results have demonstrated that AZ80A is not suitable for forging with either the screw press or the die forging hammer, that AZ61A can be press- and hammer-forged but to a limited extent, and that AZ31B can be subjected to forging in both forging machines analysed in the study.
Andrzej Gontarz; Krzysztof Drozdowski; Jacek Michalczyk; Sylwia Wiewiórowska; Zbigniew Pater; Janusz Tomczak; Grzegorz Samołyk; Grzegorz Winiarski; Piotr Surdacki. Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer. Materials 2020, 14, 32 .
AMA StyleAndrzej Gontarz, Krzysztof Drozdowski, Jacek Michalczyk, Sylwia Wiewiórowska, Zbigniew Pater, Janusz Tomczak, Grzegorz Samołyk, Grzegorz Winiarski, Piotr Surdacki. Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer. Materials. 2020; 14 (1):32.
Chicago/Turabian StyleAndrzej Gontarz; Krzysztof Drozdowski; Jacek Michalczyk; Sylwia Wiewiórowska; Zbigniew Pater; Janusz Tomczak; Grzegorz Samołyk; Grzegorz Winiarski; Piotr Surdacki. 2020. "Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer." Materials 14, no. 1: 32.
In the work, the results of the research concerned with the TRIP (Transformation Induced Plasticity) steel wire drawing process in experimental and theoretical ways are shown. The wire drawing process tests on the experimental way were conducted in both laboratories as well as industrial conditions, with the use of two drawing speeds (1.6 and 6 m/s) and two drawing schemes (low and high single reductions). The mechanical properties of wires drawn with high drawing speed equal to 6 m/s showed higher values of mechanical properties for wires drawn with low single reductions than for wires drawn with high single reductions. Such a phenomenon contradicts the theory of drawing wires from steel with a ferritic-pearlitic structure and must be related to TRIP structure and the presence of retained austenite in it, which is transformed into martensite during the deformation process. In order to explain this phenomenon, the theoretical wire drawing process analysis was conducted with the use of the Drawing 2D program based on the finite element method. On the base of the simulation, a large increase in temperature was found on the surface for wires drawn with high drawing speed and low single reductions, which can cause the blocking of transformation retained austenite into martensite and thus a decrease in Rm. To confirm this thesis, further studies will include tests of the amount of retained austenite in wires obtained during experimental tests.
Monika Kucharska; Sylwia Wiewiórowska; Jacek Michalczyk; Andrzej Gontarz. The Influence of the Drawing Process on the Mechanical Properties of TRIP Steel Wires with 0.4% C Content. Materials 2020, 13, 5769 .
AMA StyleMonika Kucharska, Sylwia Wiewiórowska, Jacek Michalczyk, Andrzej Gontarz. The Influence of the Drawing Process on the Mechanical Properties of TRIP Steel Wires with 0.4% C Content. Materials. 2020; 13 (24):5769.
Chicago/Turabian StyleMonika Kucharska; Sylwia Wiewiórowska; Jacek Michalczyk; Andrzej Gontarz. 2020. "The Influence of the Drawing Process on the Mechanical Properties of TRIP Steel Wires with 0.4% C Content." Materials 13, no. 24: 5769.
The paper presented a new method for forming flanges on hollow parts by incremental radial extrusion. In the classic process of radial extrusion, additional rings were used to limit the free flow of material in the radial direction. The flange was formed progressively, using rings of increasing diameters. The proposed method was verified by numerical analysis and experimental tests. The numerical calculations were performed by the finite element method using the Deform-3D software package. Tubes made of aluminum alloy EN AW 6060 were used as billets. Laboratory tests were carried out using the Instron 1000 HDX testing machine. The objective of the study was to determine the validity of the proposed flange extrusion method. Results demonstrated that the new method made it possible to produce flanges with a relatively large diameter and uniform thickness, confirming the effectiveness of the proposed forming technique.
Grzegorz Winiarski; Andrzej Gontarz; Grzegorz Samołyk. Theoretical and Experimental Analysis of a New Process for Forming Flanges on Hollow Parts. Materials 2020, 13, 4088 .
AMA StyleGrzegorz Winiarski, Andrzej Gontarz, Grzegorz Samołyk. Theoretical and Experimental Analysis of a New Process for Forming Flanges on Hollow Parts. Materials. 2020; 13 (18):4088.
Chicago/Turabian StyleGrzegorz Winiarski; Andrzej Gontarz; Grzegorz Samołyk. 2020. "Theoretical and Experimental Analysis of a New Process for Forming Flanges on Hollow Parts." Materials 13, no. 18: 4088.
This paper investigates a cold forging process for producing hollow balls made of an aluminium alloy. The forging with an outside diameter of 30 mm is formed from a tube section with a 2-mm wall thickness. Preliminary tests have shown that in traditional die forging, the use of a billet with such a small relative thickness not only limits the range of applicable geometric parameters but also causes buckling. The authors propose to solve this problem by using an additional tool that has an active effect on the inner surface of the workpiece, and thus makes it possible to control the forging process conditions. The tool is a plastic insert, i.e., an additional flexible core made of a low-melting alloy. Theoretical and experimental results presented in this paper provide a considerable insight into the cold forging process for thin-walled hollow balls. The effects of the plastic insert geometry and dimensions on the forging process are also examined. A solution is proposed to ensure that the forged part meets all requirements.
Grzegorz Samołyk; Grzegorz Winiarski; Andrzej Gontarz. A cold forging process for producing thin-walled hollow balls from tube using a plastic insert. The International Journal of Advanced Manufacturing Technology 2020, 108, 1429 -1446.
AMA StyleGrzegorz Samołyk, Grzegorz Winiarski, Andrzej Gontarz. A cold forging process for producing thin-walled hollow balls from tube using a plastic insert. The International Journal of Advanced Manufacturing Technology. 2020; 108 (5-6):1429-1446.
Chicago/Turabian StyleGrzegorz Samołyk; Grzegorz Winiarski; Andrzej Gontarz. 2020. "A cold forging process for producing thin-walled hollow balls from tube using a plastic insert." The International Journal of Advanced Manufacturing Technology 108, no. 5-6: 1429-1446.
This paper begins with a brief overview of the methods for producing balls. It then discusses the rolling processes for producing balls in helical passes. Next, a method for designing tools for helical rolling (HR) is described. Six different cases of rolling using tools with helical passes of different lengths are modeled by the finite element method (FEM). The simulations are performed with the use of Simufact Forming version 13.3. Based on the 3D simulations, the distributions of effective strain, damage criterion, and temperature, as well as the variations in loads and torques, are determined. This study also predicts the rate and manner of wear of the helical tools, depending on the tool design. As a result, it has been found that an increased length of the helical forming passes is advantageous in terms of tool service life. It has also been found that excessive elongation of the forming zone is not cost-effective.
Andrzej Gontarz; Janusz Tomczak; Zbigniew Pater; Tomasz Bulzak. Effect of the Forming Zone Length on Helical Rolling Processes for Manufacturing Steel Balls. Materials 2019, 12, 2917 .
AMA StyleAndrzej Gontarz, Janusz Tomczak, Zbigniew Pater, Tomasz Bulzak. Effect of the Forming Zone Length on Helical Rolling Processes for Manufacturing Steel Balls. Materials. 2019; 12 (18):2917.
Chicago/Turabian StyleAndrzej Gontarz; Janusz Tomczak; Zbigniew Pater; Tomasz Bulzak. 2019. "Effect of the Forming Zone Length on Helical Rolling Processes for Manufacturing Steel Balls." Materials 12, no. 18: 2917.
Ring rolling is a hot forming process for producing rings that have large diameters when compared to their cross sections. This process is very dynamic and involves considerable variations in ring shape and size. One of the failure modes in ring rolling processes is slip that occurs when a thickness reduction, exceeds the limit value. The thickness reduction depends on the tool speed and dimensions as well as ring size, and varies over time. This paper reports results of a study investigating the thickness reduction with respect to slip occurrence. In terms of wall thickness reduction, the process can be divided into three distinct stages (excluding the sizing stage): (i) initial stage corresponding to the first revolution of the roll, (ii) main stage, when the proper ring rolling takes place, (iii) final stage, when the main roll does not move in an axial direction but the ring is being formed during one revolution of the tool. It has been found that the most slip-prone moment is the end of the second and the beginning of the third stage of the ring rolling process, when the wall thickness reduction is the highest. Based on a comparison of the calculated thickness reduction and its limit values, it could be predicted whether slip would occur, and if so – in what stage of the rolling process. Numerical results and experimental findings are in good agreement.
Andrzej Gontarz; Piotr Surdacki; Piotr Surdack. Investigation of Slip Occurrence in the Ring Rolling Process. MATEC Web of Conferences 2019, 291, 02006 .
AMA StyleAndrzej Gontarz, Piotr Surdacki, Piotr Surdack. Investigation of Slip Occurrence in the Ring Rolling Process. MATEC Web of Conferences. 2019; 291 ():02006.
Chicago/Turabian StyleAndrzej Gontarz; Piotr Surdacki; Piotr Surdack. 2019. "Investigation of Slip Occurrence in the Ring Rolling Process." MATEC Web of Conferences 291, no. : 02006.
The paper presents the results of tube flange forming by radial extrusion. The process was carried out according to two variants: with and without the use of a limit ring. The objective of the study reported in this paper was to determine the effect of the die corner radius and the gap height on the course of the radial extrusion process, determine the limit diameter of the flange and effect of limit ring dimensions on the radial extrusion process performed with the use of this ring. The research was performed in cold working conditions with the use of tubular billet made of 6060 aluminium alloy. The analyses were based on experimental tests using a testing machine and numerical calculations based on FEM. Obtained results demonstrate that the use of a limit ring has a positive effect on the state of stress in the extruded flange, which – in turn – allows to produce flanges with relatively big diameters. Such flanges are also characterised by lower thickening than those produced by radial extrusion process without ring.
Grzegorz Winiarski; Andrzej Gontarz; Grzegorz Samołyk. Flange formation in aluminium alloy EN AW 6060 tubes by radial extrusion with the use of a limit ring. Archives of Civil and Mechanical Engineering 2019, 19, 1020 -1028.
AMA StyleGrzegorz Winiarski, Andrzej Gontarz, Grzegorz Samołyk. Flange formation in aluminium alloy EN AW 6060 tubes by radial extrusion with the use of a limit ring. Archives of Civil and Mechanical Engineering. 2019; 19 (4):1020-1028.
Chicago/Turabian StyleGrzegorz Winiarski; Andrzej Gontarz; Grzegorz Samołyk. 2019. "Flange formation in aluminium alloy EN AW 6060 tubes by radial extrusion with the use of a limit ring." Archives of Civil and Mechanical Engineering 19, no. 4: 1020-1028.
The paper proposes a new method for determining critical damage values in hot forming processes. The method first involves performing tensile tests of axisymmetric samples and then simulating these tests numerically. Simulations are performed by the finite element method in a three-dimensional state of strain, including thermal phenomena occurring in the forming zone. The elaborated method is universal and can be used for different materials. The study is performed for two steel grades, i.e., R200 railway steel and 100Cr6 bearing steel. The results demonstrate that critical damage values strongly depend on the forming temperature.
Zbigniew Pater; Andrzej Gontarz. Critical Damage Values of R200 and 100Cr6 Steels Obtained by Hot Tensile Testing. Materials 2019, 12, 1011 .
AMA StyleZbigniew Pater, Andrzej Gontarz. Critical Damage Values of R200 and 100Cr6 Steels Obtained by Hot Tensile Testing. Materials. 2019; 12 (7):1011.
Chicago/Turabian StyleZbigniew Pater; Andrzej Gontarz. 2019. "Critical Damage Values of R200 and 100Cr6 Steels Obtained by Hot Tensile Testing." Materials 12, no. 7: 1011.
The paper presents the results of research on two new forging processes for producing bicycle hub forgings in a three-slide forging press. The first process is related to producing a forging with an axial cavity by flashless forging. The other one concerns the production of a forging from a tube billet. The potential benefits offered by these two new forging processes compared to the conventional hammer forging method for producing hubs are discussed. The designed processes are verified theoretically via numerical simulations. The first of the proposed processes is also subjected to experimental verification. The results demonstrate that the new technologies allow obtaining good quality products. A comparison is made between material and energy consumption in the two analyzed processes and in conventional hammer forging. It is found that the application of the forging process in a three-slide forging press leads to a considerable decrease in manufacturing costs.
Andrzej Gontarz; Anna Dziubiñska; Grzegorz Winiarski; Arkadiusz Tofil. New Technologies for Producing Bicycle Hub Forging. MATEC Web of Conferences 2018, 220, 02003 .
AMA StyleAndrzej Gontarz, Anna Dziubiñska, Grzegorz Winiarski, Arkadiusz Tofil. New Technologies for Producing Bicycle Hub Forging. MATEC Web of Conferences. 2018; 220 ():02003.
Chicago/Turabian StyleAndrzej Gontarz; Anna Dziubiñska; Grzegorz Winiarski; Arkadiusz Tofil. 2018. "New Technologies for Producing Bicycle Hub Forging." MATEC Web of Conferences 220, no. : 02003.
Purpose The purpose of this study is to report results of the qualitative assessment of AZ31 aircraft brackets with a triangular rib produced by a new forging method with respect to their structure and mechanical properties. Design/methodology/approach The paper reports the results of qualitative tests for AZ31 magnesium alloy aircraft brackets with a triangular rib produced by a new forging method. These ribbed parts were formed on a forging press equipped with three moving tools. The produced aircraft brackets were subjected to qualitative tests. Their cross-sectional microstructure was examined using the light-field technique. The mechanical properties of ribbed parts were determined in a static tensile test and by hardness measurements on the surface of the part. The following variables were determined: tensile strength Rm, yield strength R0.2, elongation A5 and hardness. Findings The results of qualitative tests provide significant information about produced aircraft brackets with a triangular rib, i.e. microstructure in three key regions of brackets and their mechanical properties. Practical implications The method will enable producing magnesium alloy aircraft brackets with a triangular rib. The application of the method for aircraft brackets developed by the authors of this paper will result in higher product quality and reduced production costs. The paper demonstrates the practical application of this technique by presenting a finished aircraft bracket and the results of complete qualitative tests. Originality/value The originality of this paper lies in the presentation of a new, innovative method for manufacturing aircraft brackets with a triangular rib. This method is unique on a global scale, and its assumptions have been granted patent protection.
Anna Dziubinska; Andrzej Gontarz; Ireneusz Zagórski. Qualitative research on AZ31 magnesium alloy aircraft brackets with a triangular rib produced by a new forging method. Aircraft Engineering and Aerospace Technology 2018, 90, 482 -488.
AMA StyleAnna Dziubinska, Andrzej Gontarz, Ireneusz Zagórski. Qualitative research on AZ31 magnesium alloy aircraft brackets with a triangular rib produced by a new forging method. Aircraft Engineering and Aerospace Technology. 2018; 90 (3):482-488.
Chicago/Turabian StyleAnna Dziubinska; Andrzej Gontarz; Ireneusz Zagórski. 2018. "Qualitative research on AZ31 magnesium alloy aircraft brackets with a triangular rib produced by a new forging method." Aircraft Engineering and Aerospace Technology 90, no. 3: 482-488.
Purpose The aim of this study is to develop a die forging process for producing aircraft components made of magnesium alloy AZ61A using a screw press. Design/methodology/approach The proposed forging technique has been developed based on the results of a numerical and experimental research. The required forging temperature has been determined by upsetting cylindrical specimens on a screw press to examine both plasticity of the alloy and the quality of its microstructure. The next stage involved performing numerical simulations of the designed forging processes for producing forgings of a door handle and a bracket, both made of magnesium alloy AZ61A. The finite element method based on simulation programme, Deform 3D has been used for numerical modelling. The numerical results revealed that the forgings are free from material overheating and shape defects. In addition to this, the results have also helped determine the regions that are the most prone to cracking. The final stage of the research involved performing forging tests on a screw press under industrial conditions. The forgings of door handles and brackets were made, and then these were tested for their mechanical and structural properties. The results served as a basis for assessing both the viability of the designed technique and the quality of the produced parts. Findings The experimental results demonstrate that aircraft components made of magnesium alloy AZ61A can be produced by die forging on screw presses. The results have been used to determine the fundamental parameters of the process such as the optimum forging temperature, the method of tool heating, the way of cooling parts after the forging process, and the method of thermal treatment. The results of the mechanical and structural tests confirm that the products meet the required quality standards. Practical implications The developed forging technique for alloy AZ61A has been implemented by the forging plant ZOP Co. Ltd in Swidnik (Poland), which specializes in the manufacturing of aircraft components made of non-ferrous metal alloys. Originality/value Currently, the global tendency is to forge magnesium alloys (including alloy AZ61A) on free hydraulic presses using expensive die-heating systems. For this reason, the production efficiency of such forging processes is low, while the manufacturing costs are high. The proposed forging technique for alloy AZ61A is an innovative method for producing forgings using relatively fast and efficient machines (screw presses). The proposed forging method can be implemented by forging plants equipped with standard stocks of tools, which increases the range of potential manufacturers of magnesium alloy products. In addition, this technology is highly efficient and ensures reduced manufacturing costs.
Andrzej Gontarz; Krzysztof Drozdowski; Anna Dziubinska; Grzegorz Winiarski. A study of a new screw press forging process for producing aircraft drop forgings made of magnesium alloy AZ61A. Aircraft Engineering and Aerospace Technology 2018, 90, 559 -565.
AMA StyleAndrzej Gontarz, Krzysztof Drozdowski, Anna Dziubinska, Grzegorz Winiarski. A study of a new screw press forging process for producing aircraft drop forgings made of magnesium alloy AZ61A. Aircraft Engineering and Aerospace Technology. 2018; 90 (3):559-565.
Chicago/Turabian StyleAndrzej Gontarz; Krzysztof Drozdowski; Anna Dziubinska; Grzegorz Winiarski. 2018. "A study of a new screw press forging process for producing aircraft drop forgings made of magnesium alloy AZ61A." Aircraft Engineering and Aerospace Technology 90, no. 3: 559-565.
Sebastian Mróz; Andrzej Gontarz; Krzysztof Drozdowski; Henryk Bala; Piotr Szota. Forging of Mg/Al bimetallic handle using explosive welded feedstock. Archives of Civil and Mechanical Engineering 2018, 18, 401 -412.
AMA StyleSebastian Mróz, Andrzej Gontarz, Krzysztof Drozdowski, Henryk Bala, Piotr Szota. Forging of Mg/Al bimetallic handle using explosive welded feedstock. Archives of Civil and Mechanical Engineering. 2018; 18 (2):401-412.
Chicago/Turabian StyleSebastian Mróz; Andrzej Gontarz; Krzysztof Drozdowski; Henryk Bala; Piotr Szota. 2018. "Forging of Mg/Al bimetallic handle using explosive welded feedstock." Archives of Civil and Mechanical Engineering 18, no. 2: 401-412.
The work presents an analysis of selected magnesium alloys as structural materials to be used in production of aircraft parts as well as their technological parameters in some manufacturing processes. Upsetting test, backward extrusion and Kobo extrusion of complex cross-sectional profiles and forging process were realized using magnesium alloys AZ31, AZ61, AZ80, WE 43 and Mg alloy with Li for production of thin - walled aircraft profiles and forged aviation parts. The range of temperatures and extrusion rate for the manufacturing these profiles were determined. Tests also covered the analysis of microstructure of Mg alloys in the initial state as well as after the extrusion process. It has been proved that the proper choice of parameters in the case of a specific profile extruded from magnesium alloys allows the manufacturing of products of complex cross-sections and the quality required in aerospace industry. This has been demonstrated on the examples of complex cross-sectional profiles using elements of varied wall thickness and examples of forged aviation parts: aircraft wheel hub and helicopter lever for control system.
R.E. Śliwa; T. Balawender; E. Hadasik; D. Kuc; A. Gontarz; A. Korbel; W. Bochniak. Metal Forming of Lightweight Magnesium Alloys for Aviation Applications. Archives of Metallurgy and Materials 2017, 62, 1559 -1566.
AMA StyleR.E. Śliwa, T. Balawender, E. Hadasik, D. Kuc, A. Gontarz, A. Korbel, W. Bochniak. Metal Forming of Lightweight Magnesium Alloys for Aviation Applications. Archives of Metallurgy and Materials. 2017; 62 (3):1559-1566.
Chicago/Turabian StyleR.E. Śliwa; T. Balawender; E. Hadasik; D. Kuc; A. Gontarz; A. Korbel; W. Bochniak. 2017. "Metal Forming of Lightweight Magnesium Alloys for Aviation Applications." Archives of Metallurgy and Materials 62, no. 3: 1559-1566.
Grzegorz Winiarski; Andrzej Gontarz; Anna Dziubinska. The influence of tool geometry on the course of flanges radial extrusion in hollow parts. Archives of Civil and Mechanical Engineering 2017, 17, 986 -996.
AMA StyleGrzegorz Winiarski, Andrzej Gontarz, Anna Dziubinska. The influence of tool geometry on the course of flanges radial extrusion in hollow parts. Archives of Civil and Mechanical Engineering. 2017; 17 (4):986-996.
Chicago/Turabian StyleGrzegorz Winiarski; Andrzej Gontarz; Anna Dziubinska. 2017. "The influence of tool geometry on the course of flanges radial extrusion in hollow parts." Archives of Civil and Mechanical Engineering 17, no. 4: 986-996.
The paper presents a new metal forming process for producing two-step external flanges on hollow parts. With this method, the flange is extruded by a movable sleeve, which moves in the opposite direction to the punch. This reduces the phenomenon of buckling of the tube wall, which allows extruding flanges with relatively large volumes. The new method was applied to produce a two-step flange on the end of a tubular billet made of 6060 aluminum alloy. This cold metal forming process was designed based on numerical simulations and experimental tests. The effect of the basic technological parameters on metal flow was investigated and limitations of the process were identified. The experimental results confirmed the possibility of forming a two-step flange with a diameter that is approximately twice as big as the external diameter of the tubular billet.
G. Winiarski; Andrzej Gontarz. Numerical and Experimental Study of Producing Two-Step Flanges by Extrusion with a Movable Sleeve. Archives of Metallurgy and Materials 2017, 62, 495 -499.
AMA StyleG. Winiarski, Andrzej Gontarz. Numerical and Experimental Study of Producing Two-Step Flanges by Extrusion with a Movable Sleeve. Archives of Metallurgy and Materials. 2017; 62 (2):495-499.
Chicago/Turabian StyleG. Winiarski; Andrzej Gontarz. 2017. "Numerical and Experimental Study of Producing Two-Step Flanges by Extrusion with a Movable Sleeve." Archives of Metallurgy and Materials 62, no. 2: 495-499.
The paper reports a selection of numerical and experimental results of a new closed-die forging method for producing AZ31 magnesium alloy aircraft brackets with one rib. The numerical modelling of the new forming process was performed by the finite element method.The distributions of stresses, strains, temperature and forces were examined. The numerical results confirmed that the forgings produced by the new forming method are correct. For this reason, the new forming process was verified experimentally. The experimental results showed good agreement with the numerical results. The produced forgings of AZ31 magnesium alloy aircraft brackets with one rib were then subjected to qualitative tests.
A. Dziubińska; A. Gontarz; K. Dziedzic. Qualitative Research of AZ31 Magnesium Alloy Aircraft Brackets Produced by a New Forging Method. Archives of Metallurgy and Materials 2016, 61, 1003 -1008.
AMA StyleA. Dziubińska, A. Gontarz, K. Dziedzic. Qualitative Research of AZ31 Magnesium Alloy Aircraft Brackets Produced by a New Forging Method. Archives of Metallurgy and Materials. 2016; 61 (2):1003-1008.
Chicago/Turabian StyleA. Dziubińska; A. Gontarz; K. Dziedzic. 2016. "Qualitative Research of AZ31 Magnesium Alloy Aircraft Brackets Produced by a New Forging Method." Archives of Metallurgy and Materials 61, no. 2: 1003-1008.
This paper aims at working out an innovative technology of aircraft brackets with a rib of a triangular outline manufacturing from magnesium alloy AZ31 based on forging process. Theoretical analysis of the assumed forming process of brackets with a rib of a triangular outline was made on the basis of computer simulations in software Deform 3D, basing on finite-element method. Research works were conducted for a magnesium plate from magnesium AZ31 alloy. Considering calculations, the scope of technological parameters guaranteeing the process proper course and good quality of the product was determined. Theoretical results were verified using a three-slide forging press. The experiment’s results confirmed the effectiveness of the worked-out technology and the rightness of its application at manufacturing of brackets from non-ferrous metals used in the aircraft industry. The main aim of the worked-out method is manufacturing of aircraft brackets from light metals alloys, e.g. magnesium alloys. This technology can be applied for plastic forming of flat parts with ribs of a triangular outline. Manufacturing of aircraft brackets, basing on that worked out by the author’s technology, will allow for the improvement of products’ quality and reduction of their manufacturing costs. The originality of this paper is based on the presentation of a new, innovative manufacturing technology of brackets with a rib of a triangular outline. The presented method is a unique one at a national (Poland) and global scale, and its assumptions underwent patent protection.
Anna Dziubinska; Andrzej Gontarz. A new technology for producing AZ31 magnesium alloy aircraft brackets with a triangular outline. Aircraft Engineering and Aerospace Technology 2016, 88, 452 -457.
AMA StyleAnna Dziubinska, Andrzej Gontarz. A new technology for producing AZ31 magnesium alloy aircraft brackets with a triangular outline. Aircraft Engineering and Aerospace Technology. 2016; 88 (3):452-457.
Chicago/Turabian StyleAnna Dziubinska; Andrzej Gontarz. 2016. "A new technology for producing AZ31 magnesium alloy aircraft brackets with a triangular outline." Aircraft Engineering and Aerospace Technology 88, no. 3: 452-457.
The paper presents the theoretical and technological aspects of forming magnesium alloy parts for aircraft and automotive applications. The main applications of magnesium alloys in the aircraft and automotive industries are discussed. In addition, the forging technology for magnesium alloys is...
Anna Dziubińska; Andrzej Gontarz; Mieczysław Dziubiński; Marcin Barszcz. THE FORMING OF MAGNESIUM ALLOY FORGINGS FOR AIRCRAFT AND AUTOMOTIVE APPLICATIONS. Advances in Science and Technology Research Journal 2016, 10, 158 -168.
AMA StyleAnna Dziubińska, Andrzej Gontarz, Mieczysław Dziubiński, Marcin Barszcz. THE FORMING OF MAGNESIUM ALLOY FORGINGS FOR AIRCRAFT AND AUTOMOTIVE APPLICATIONS. Advances in Science and Technology Research Journal. 2016; 10 (31):158-168.
Chicago/Turabian StyleAnna Dziubińska; Andrzej Gontarz; Mieczysław Dziubiński; Marcin Barszcz. 2016. "THE FORMING OF MAGNESIUM ALLOY FORGINGS FOR AIRCRAFT AND AUTOMOTIVE APPLICATIONS." Advances in Science and Technology Research Journal 10, no. 31: 158-168.
The paper presents the numerical and experimental results of a new method for producing flanges on hollow parts. With this new method, the flange is extruded by a movable sleeve. This innovative technique is modelled numerically by the finite element method. The effect of workpiece and finished product geometries on the forming process is investigated and failure modes are identfied. The numerical reults are then verified in experiments. The tests are conducted using a three-slide forging press equipped with a special device. The numerical and experimental results show a good agreement, which proves that the developed method is correct.
A. Gontarz; G. Winiarski. Numerical and Experimental Study of Producing Flanges on Hollow Parts by Extrusion with a Movable Sleeve / Badania Teoretyczno-Doświadczalne Procesu Wyciskania Z Zastosowaniem Ruchomej Tulei Kołnierza We Wsadach Drążonych. Archives of Metallurgy and Materials 2015, 60, 2733 -2738.
AMA StyleA. Gontarz, G. Winiarski. Numerical and Experimental Study of Producing Flanges on Hollow Parts by Extrusion with a Movable Sleeve / Badania Teoretyczno-Doświadczalne Procesu Wyciskania Z Zastosowaniem Ruchomej Tulei Kołnierza We Wsadach Drążonych. Archives of Metallurgy and Materials. 2015; 60 (4):2733-2738.
Chicago/Turabian StyleA. Gontarz; G. Winiarski. 2015. "Numerical and Experimental Study of Producing Flanges on Hollow Parts by Extrusion with a Movable Sleeve / Badania Teoretyczno-Doświadczalne Procesu Wyciskania Z Zastosowaniem Ruchomej Tulei Kołnierza We Wsadach Drążonych." Archives of Metallurgy and Materials 60, no. 4: 2733-2738.