Physico-technological basics of aircraft long parts hardening in the devices with rotating magnetic field

Machine-building Engineering and Machine Science

Mechanical engineering technology


DOI: 10.34759/vst-2020-1-201-216

Аuthors

Kochubei A. A.1*, Vernigorov Y. M.2**, Demin G. V.2***

1. ,
2. Don State Technical University, DSTU, 1, Gagarin square, Rostov-on-Don, 344003, Russia

*e-mail: watchbox@mail.ru
**e-mail: jvernigorov@donstu.ru
***e-mail: georgijdstu@yandex.ru

Abstract

The article gives an account of the studies of hardening treatment of long thin-walled parts employing imposition of magneto-dynamic effect. It presents characteristics of movement of the ferromagnetic indenters moving freely in rotating magnetic field (REMF) and thermodynamic model, which determines energy characteristics of ferromagnetic indenters moving freely in REMF. The article describes characteristics of its impulse function on the processed surface, as well as the degree of their effective loading. It presents analytical dependencies, allowing objectively ensure prediction of the surface layer parameters of quality while its forming, and productivity of magneto-dynamic hardening treatment. A technique for technological process developing of parts treatment operation with magnetodunamic effect imposition. Recommendations on the design of devices with REMF, as well as technological outfit means, allowing enhancing efficiency of their employing in the parts hardening treatment technology, are given.

The purpose of the study consists in developing a hardening treatment technology by surface plastic deformation of long thin-walled parts with magneto­dynamic effect imposition and practical recommendations on its application.

The following conclusions were made by the results of the conducted study:

1.   The rotating electromagnetic field application as an energy source of the freely moving ferromagnetic indenters is the basis for developing and improving of a new method for parts hardening treatment, called magneto-dynamic processing.

2.   Magnetohydrodynamic treatment enhances technological capabilities of hardening treatment by freely moving indenters, and ensures efficiency increasing of finishing-strengthening treatment of the inner cavities of long thin parts.

3.   Technological effect of the magneto-dynamic processing is stipulated by the motion of a large number of ferromagnetic freely moving indenters, placed into the REMF, forming in gross amount a magneto-liquefied moving layer. This layer interacts with the surface layer of the processed parts, being the result of the effect on each ferromagnetic freely moving indenter of the whole row of forces and moments.

4.   It was proved that for stable magneto­liquefaction process of the rotating layer both input and dissipated energies should be set equal in such a way that the magneto-liquefied moving layer would transfer from liquefied phase to a hard one under condition when the REMF induction would be less than 0.08 Tl.

5.   Based on the energy balance modelling the dependency for energy characteristics evaluation of ferromagnetic indenters freely moving in the REMF was obtained. It allows substantiate the force conditions of the shock-pulse impact, which ensure plastic deformation in contact zone of indenter with the processed surface and, as a consequence, the hardening effect development.

6.   The nature of the energy-force action of indenters on the processed surface layer depends on the degree of their constricted state in the MRF layer. It was confirmed experimentally that the loading quantity of freely moving ferromagnetic indenters, which formed the MRF layer, into the processing chamber of the device should not exceed three concentrically arranged layers, commensurable with the indenter length.

7.   Based on theoretical and probabilistic representations, the dependence allowing predicting duration of the magneto-dynamic hardening treatment and correspondingly evaluate the process productivity was obtained.

8.   The presented analytical dependencies for determining quality parameters of the surface hardened while magneto-dynamic method processing determine with adequate fidelity the effect of energy condition and size of ferromagnetic indenters, the initial state of the surface geometry, as well as mechanical properties of the material, subjected to the treatment, on their formation. The results of the studies demonstrate that the presented analytical dependencies can be employed while developing magneto-dynamic parts hardening treatment technology with with an accuracy to 10-15%.

9.   An algorithm, determining technological conditions of treatment was developed. Recommendations are given on embodiment of the devices with REFM , on which basis formalization of operations for hardening procession by magneto­dynamic method are possible. It contributes to effectiveness enhancing of the production planning process employing CAD TP

10. Application of feed-through type installations, realizing magneto-dynamic processing method compared to the existing hardening technology with UPD-2.5 allows significantly decrease both energy and materials consumption of the equipment, reduce technological processing time, decrease auxiliary time on parts setting and, thus, increase the productivity of hardening process, ensuring herewith quality parameters of the surface layer, regulated by technical requirements.

Keywords:

magneto-dynamic treatment, hardening, surface quality parameters, surface plastic deformation (SPD), rotating electromagnetic field (REMF), ferromagnetic indenter, magnetically fluidized rotating (MFR) layer

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