Theoretical and experimental investigation of cold hobbing processes in cases of cone-like punch manufacturing

Milutinović, Mladomir; Movrin, Dejan; Pepelnjak, Tomaž

doi:10.1007/s00170-011-3457-5

Cited by 13 publications

(6 citation statements)

References 26 publications

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“…Material properties, the features of its machinability as well as numerical analysis of the structure made of the considered material belong to the most important information about both material and structure. In this sense, it is also recommended to get an insight into some investigations not only made by the authors of this work but also by other authors [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. The possibility of the use of the finite element method in the shear stress analysis of the structure made of any of the mentioned materials is presented in [ 24 ].…”

Section: Introductionmentioning

confidence: 94%

Mechanical Properties, Short Time Creep, and Fatigue of an Austenitic Steel

et al. 2016

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The correct choice of a material in the process of structural design is the most important task. This study deals with determining and analyzing the mechanical properties of the material, and the material resistance to short-time creep and fatigue. The material under consideration in this investigation is austenitic stainless steel X6CrNiTi18-10. The results presenting ultimate tensile strength and 0.2 offset yield strength at room and elevated temperatures are displayed in the form of engineering stress-strain diagrams. Besides, the creep behavior of the steel is presented in the form of creep curves. The material is consequently considered to be creep resistant at temperatures of 400 °C and 500 °C when subjected to a stress which is less than 0.9 of the yield strength at the mentioned temperatures. Even when the applied stress at a temperature of 600 °C is less than 0.5 of the yield strength, the steel may be considered as resistant to creep. Cyclic tensile fatigue tests were carried out at stress ratio R = 0.25 using a servo-pulser machine and the results were recorded. The analysis shows that the stress level of 434.33 MPa can be adopted as a fatigue limit. The impact energy was also determined and the fracture toughness assessed.

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Section: Introductionmentioning

confidence: 94%

Mechanical Properties, Short Time Creep, and Fatigue of an Austenitic Steel

et al. 2016

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“…In this case, the current stress is estimated approximately on the basis of the upsetting test and the yield stress of the material or, as in the case of a correction factor, is determined by the empirically obtained values from [24], shown in Table 2. Deformation resistance in Table 2 is defined as a product of a forging factor, K k , and flow stress, k f1 , for the specimen material [2].…”

Section: Empirical Model Of Coining Forcementioning

confidence: 99%

“…Many papers are concerned with the study of the size effects in micro-forming, [7] and [11] to [13], and their influence on the various microforming processes, such as micro-indentation [14], micro-imprinting [15], micro-extrusion, [16] and [17], and the bulk forming processes of sheet metal, [18] and [19]. However, relatively few works deal with the coining process and the real problems of production, such as residual stress, elastic deformation and incomplete die filling, [1] to [3], [10] and [20] to [22], lubricant residues and surface damage [23], and tool development and manufacturing, [24] and [25]. That is why this process is still not well-researched and wellknown, especially from the micro-forming point of view.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of Model Force Prediction in Closed Die Coining Process

2018

SV-JME

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“…Several articles have examined the impact of size effects on various micro‐forming processes [7, 11–19]. However, there is limited number of researches dealing with real problems in coining regarding elastic deformations, residual stress, and half‐filled die cavities, the traces of lubricants and surface imperfections, and development, manufacturing and analysis of tools [1–3, 10, 20–25]. By determining the influence of size effects caused by different crystal grain sizes, the forging force, filling of the die cavity and elastic spring back can be estimated, by which the properties of the final product can be controlled and customized.…”

Section: Introductionmentioning

confidence: 99%

Strain behaviour of aluminum 99.5 in micro‐forming conditions of the coining process

Mihaljević

Piljek

Keran

et al. 2021

Materialwissenschaft Werkst

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The coining process can be identified as a shallow die forging. By using this process, it is possible to produce very fine surface geometries. This leads to dimension scaling into micro dimensions and causes the specific material behavior. In the micro area, continuum laws are not strictly followed anymore. The leading role in determining the deformation and strain level is taken by the fine surface geometry dimension and the size of the crystalline grain of the workpiece material. This is known as the size effect and defines all micro‐forming processes. In order to provide monitoring of the filling of the smallest die dimensions, additional supporting procedures should be used. In this case, radiography testing procedures for observing the specific points of the workpiece geometry are applied, characterized with very small dimensions (less than 0.5 mm). Testing aluminum samples are formed using two techniques – open and closed die coining, with identical surface geometry. Their crystalline structures are in two‐grain sizes of 34 μm and 80 μm. Scanning results show different material behaviour and different surface deformation for the same level of forming force in all four testing cases.

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Theoretical and experimental investigation of cold hobbing processes in cases of cone-like punch manufacturing

Cited by 13 publications

References 26 publications

Mechanical Properties, Short Time Creep, and Fatigue of an Austenitic Steel

Mechanical Properties, Short Time Creep, and Fatigue of an Austenitic Steel

Accuracy of Model Force Prediction in Closed Die Coining Process

Strain behaviour of aluminum 99.5 in micro‐forming conditions of the coining process

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