Superplastic forming of shells from sheet blanks with thermally unstable coatings

Анищенко, Александр Сергеевич; Kukhar, Volodymyr; Artiukh, Viktor; Arkhipova, Olga

doi:10.1051/matecconf/201823906006

Cited by 29 publications

(9 citation statements)

References 22 publications

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“…Based on the following assumptions [4][5][6]: a) we consider a sufficiently thin shell, which allows us to consider the distribution of stresses throughout the thickness to be uniform; b) the shell material is incompressible; c) shear stresses are small [7]; d) the mass of the shell does not change during deformation [8,9].…”

Section: Methods Of Researchmentioning

confidence: 99%

Application of intelligently controlled technologies in designing of technological processes for explosive forming of shell parts

Shlyk

2021

TAPR

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The object of research is the processes of pulse metalworking (hydroexplosive, magnetic pulse, electrohydraulic, gas detonation forming, etc.). Among these methods of forming for the production of aircrafts engines parts from cylindrical and conical blanks, the most efficient in terms of its energy capabilities and overall dimensions is explosive. The modern level of theory and practice of metal forming processes allows, on the basis of a systematic approach and control theory, to determine the optimal parameters of plastic forming processes, select the best technical solutions, and create a precondition for the transition to complex automation. The most difficult task of metals forming methods optimizing is to find the best solution among many potentially possible ones, considering the introduced restrictions and efficiency criteria, environmental, economic, technical, ergonomic, and other requirements. The most problematic is that it is impossible to optimize the process of forming post-factum (finishing works, elimination of defects in shape and size, welding of cracks, etc. are required), therefore, when solving optimization problems, the implementation of the feedback principle is required - comparison of the value of the controlled variable, determined by the control program, with the desired value. In general, the processes of metal forming by pressure are characterized by a variety of problems of the theory of optimal control, the solution of which is carried out by methods of mathematical programming. And, although the equipment for pulse processing can have a different design, it necessarily includes structural elements that make it possible to convert the energy of the source and with its help (through the action of a solid body, transmitting medium, or field) to deform the metal of the workpiece. Due to this, in this work, it is proposed to control the quality of the obtained parts by varying the degree of deformation of the workpiece in the process of forming. The result of the work is the development of an integrated intelligent system, with the help of which it is possible to carry out the computer-aided design of almost all pulse-action processes based on the intelligent selection of suitable forming parameters.

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Section: Methods Of Researchmentioning

confidence: 99%

Application of intelligently controlled technologies in designing of technological processes for explosive forming of shell parts

Shlyk

2021

TAPR

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“…It is known that metal behaviour at hot deformation and, correspondingly, the stability of the process can be influenced by the following factors: manufacturing method and the quality of primary workpiece [6], presswork method [7], temperature and presswork velocity [8][9][10], strain degree [11], type of lubricants [12], presence of macro-structure defects in a cast blank [13,14], etc.…”

Section: Statement Of Problemmentioning

confidence: 99%

Evaluating Plasticity of Alloy AD31 on Ingot Height

Smyrnov¹,

Sklyar²,

Parpiev³

2021

SSP

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The authors present the results of evaluating the distribution of plastic properties on the height of a log ingot with the diameter of 145 mm, obtained by means of semi-continuous casting, from the aluminum alloy AD31. The authors study semi-continuous alloys of three manufacturers. One part of ingots was obtained with the use of only primary aluminum, secondary raw materials and secondary raw materials with the addition of primary aluminum. With the purpose of stabilizing the process of presswork the authors define the values of yield stress in the ingot lower and upper parts and study its microstructure. The research was conducted for the ingots without thermal treatment after accelerated homogenization. It is shown that the ingots, produced with the use of primary aluminum only, have less scattered plastic properties in terms of the height. That is why, for the case of press-working the items with thin components, it is reasonable to use the ingots from primary aluminum.

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“…The study of the influence of loading conditions in contact in the presence of lubricants has been considered in a number of scientific papers. By using the pendulum method, described in works [4,8], it was established that under conditions of viscous friction, oscillation attenuation curve on the elastic layer of molecules has a linear law. However, the oscillation attenuation curve on an unordered layer of lubricant is characterized by the logarithmic law of damping.…”

Section: Literature Reviewmentioning

confidence: 99%

Contact-deformation mechanism of boundary friction

2020

Self Cite

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Research was conducted to determine the effect of lubricants on stress and strain in the contact of metal surfaces. Experiments were carried out on the introduction of a fixed and moving indenter in contact with a dry and lubricated surface.The steel spherical specimen was pressed into a lubricated and dry metal surface. The microstructures of the structure of the surface layer are studied under various conditions of deformation. The diagrams of the relative deformation of the surface layers are constructed. The mechanism of the formation and distribution of internal stresses for dry and greased contact is described. Experimental studies of the introduction of a moving steel indenter into a lubricated surface have been carried out. The relationship of the deformation mechanisms of lubricated surfaces with their wear resistance is determined. The results obtained are recommended for predicting the durability of lubricated friction units according to the criterion of contact strength.

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Superplastic forming of shells from sheet blanks with thermally unstable coatings

Cited by 29 publications

References 22 publications

Application of intelligently controlled technologies in designing of technological processes for explosive forming of shell parts

Application of intelligently controlled technologies in designing of technological processes for explosive forming of shell parts

Evaluating Plasticity of Alloy AD31 on Ingot Height

Contact-deformation mechanism of boundary friction

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