Precision forging process with axially driven container

Osakada, Kozo; Wang, X.; Hanami, Shinji

doi:10.1016/s0924-0136(97)00155-6

Cited by 19 publications

(7 citation statements)

References 1 publication

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“…As for the case of significant irregularities of the technological process, such as an excessive volume of the input material or an insufficiently high temperature, there is a great probability of a rapid increase of the forming forces and stresses, which can lead to a press shut-down or a tool fracture. That is why elimination of flaws at this stage of forging is the basic condition for the production of a proper forging in respect of the quality as well as the size and shape [4][5][6][7][8].…”

Section: Input Materials Preparationmentioning

confidence: 99%

Solution Examples of Selected Issues Related to Die Forging / Przykłady Rozwiązań Wybranych Zagadnień Związanych Z Kuciem Matrycowym

Gronostajski¹,

Hawryluk²,

Jakubik³

et al. 2015

Archives of Metallurgy and Materials

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SolutIon exampleS of Selected ISSueS related to dIe forgIngPrzykłady rozwiązań wybranych zagadnień związanych z kuciem matrycowym W artykule przedstawiono wybrane przykłady rozwiązań i ich zastosowań w przemysłowych procesach kucia matrycowego. Opisano zagadnienia i problemy, z którymi autorzy zetknęli się w trakcie wieloletniej współpracy z przemysłem kuzienniczym oraz metody ich analizy. Jak wykazano w licznych artykułach i opracowaniach parametry wpływające na procesy kucia matrycowego podlegają złożonym i wzajemnie powiązanym relacjom, które w znacznym stopniu komplikują analizę procesów kucia. Jest to powodem coraz częstszego sięgania po szereg narzędzi informatycznych: CAD/CAM/CAE, symulacje numeryczne oparte o MES, skanowanie powierzchni matryc i stempli, a także zaawansowane badania mikrostrukturalne, modelowanie fizyczne, czy też zastosowanie specjalnych systemów pomiarowo-kontrolnych do praktycznej weryfikacji zastosowanych rozwiązań. Przeprowadzone w pracy badania obejmowały głównie: analizę przygotowania wstępniaków, wpływu ich geometrii na jakość odkuwki, sposobu nagrzewania materiału i narzędzi, analizę warunków tribologicznych, a także optymalizację wybranych procesów ze względu na parametry siłowe, rozkłady odkształceń i temperatur oraz zminimalizowanie masy materiału wsadowego. Zagadnienia opisane przez autorów w artykule mają na celu przybliżyć problematykę współczesnych procesów kucia matrycowego i metody ich rozwiązywania oraz wskazać możliwe kierunki rozwoju tej technologii.

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Section: Input Materials Preparationmentioning

confidence: 99%

Solution Examples of Selected Issues Related to Die Forging / Przykłady Rozwiązań Wybranych Zagadnień Związanych Z Kuciem Matrycowym

Gronostajski¹,

Hawryluk²,

Jakubik³

et al. 2015

Archives of Metallurgy and Materials

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“…Die forging is one of the few metal forming processes that enables the manufacture of parts of complex shapes [1][2][3], and when using precision forging, also eliminates additional machining [4][5][6]. Die forging processes can be used for forging products both of steel [7,8], as well as of non-ferrous metals, chiefly aluminium, titanium and copper alloys, and in recent years, also of magnesium and nickel [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Szota,

Mróz,

Gontarz

et al. 2019

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The present paper reports the results of theoretical and experimental studies of the process of die forging a bimetallic door handle intended for the production of a helicopter. The aim of the studies was to develop and implement a technology for die forging of a product with a specific mass similar to that of magnesium alloys which will have, however higher corrosion resistance. Numerical modelling and industrial tests were carried out based on the previously forging processes for an AZ31 alloy door handle. The material for the tests was a bimetallic bar produced by the explosive welding method, in which the core was of alloy AZ31, and the cladding layer was made of 1050A grade aluminium. The studies were conducted for two variants: Variant I -the forging process was mapped by numerical modelling and industrial tests for the die shape and parameters used in the forging of the AZ31 alloy door handle, Variant II -the tool shape was optimized and process parameters were selected so as to obtain a finished product characterized by a continuous Al layer.From the theoretical studies and experimental tests carried out it has been found that the application of the Variant I does not assure that a finished door handle characterized by a continuous cladding layer will be produced. Within this study, a novel method of bimetallic door handle die forging (Variant II) has been developed, which limits the amount of the flash formed and assures the integrity of the cladding layer.

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“…Thus, control of the material flow is extremely important for reducing the pressure at the final stage of the forward/backward extrusion process in order to take advantage of the combined processes [4]. In general, in forward and backward can extrusion, the cavity for a smaller extrusion ratio is filled first, and then the forming pressure increases sharply because the simultaneous forward/backward extrusion becomes a single extrusion [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on the Extruded Volume and Length Ratios of Backward Tube to Forward Rod in Combined Extrusion Processes

Ham

Seo

et al. 2006

MSF

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This paper is concerned with forward rod extrusion combined simultaneously with backward tube extrusion process in both steady and transient states. The analysis has been conducted in numerical manner by employing a rigid-plastic finite element method. AA 2024 aluminum alloy was selected as a model material for analysis. Among many process parameters, major design factors chosen for analysis include frictional condition, thickness of tube in backward direction, punch corner radius, and die corner radius. The main goal of this study is to investigate the material flow characteristics in combined extrusion process, i.e. forward rod extrusion combined simultaneously with backward tube extrusion process. Simulation results have been summarized in term of relationships between process parameters and extruded length and volume ratios, and between process parameters and force requirements, respectively. The extruded length ratio is defined as the ratio of tube length extruded in backward direction to rod length extruded in forward direction, and the volume ratio as that of extruded volume in backward direction to that in forward direction, respectively. It has been revealed from the simulation results that material flow into both backward and forward directions are mostly influenced by the backward tube thickness, and other process parameters such as die corner radius etc. have little influence on the volume ratio particularly in steady state of combined extrusion process. The pressure distributions along the tool-workpiece interface have been also analyzed such that the pressure exerted on die is not so significant in this particular process such as combined operation process. Comparisons between multi-stage forming process in sequence operation and one stage combined operation have been also made in terms of forming load and pressure exerted on die. The simulation results shows that the combined extrusion process has the greatest advantage of lower forming load comparing to that in sequence operation.

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Precision forging process with axially driven container

Cited by 19 publications

References 1 publication

Solution Examples of Selected Issues Related to Die Forging / Przykłady Rozwiązań Wybranych Zagadnień Związanych Z Kuciem Matrycowym

Solution Examples of Selected Issues Related to Die Forging / Przykłady Rozwiązań Wybranych Zagadnień Związanych Z Kuciem Matrycowym

Archives of Metallurgy and Materials

Numerical Analysis on the Extruded Volume and Length Ratios of Backward Tube to Forward Rod in Combined Extrusion Processes

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