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Gubin TimurFaculty: MechanicalSpeciality: «Technology of machine-building» |
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The reliability and longevity of the machines and machinery
depend on the quality of the detail’s surfaced layers. It’s necessary to use that methods of the treatment to
improve the fatigue strength and endurance, which in parallel with the improvement of detail’s surface
microgeometry change the structure in the necessary direction, change physics-mechanical characteristics and
strained condition of the surface layer.
That’s why the questions about combination tool’s application,
development and upgrading are still remains actual in modern machine building branch, because that treatment
ensure the essential reduction of the labour-intensiveness due to combining the operations and the high
quality of the detail’s surfaced layer.
The object of the work — is the improvement of the surfaced
layer’s quality and productivity of the detail’s treatment with the application of the combined treated
sharpening and surface-plastic deformation by development of the methodology of the optimal parameter’s
identification and combination tool’s constructions upgrading.
The scientific newness consists in development of the methodology of
the optimal parameter’s of the combined treated thin sharpening and diamond pressing. Also in the work
solving the problem of choice of the optimal constructions tools for combined treated sharpening and for
surface-plastic deformation, which are provides the best quality of the surfaced layer after treatment and
the universality of the application.
In combined treatment rational parameters the thin sharpening and
diamond pressing the level of roughness Racomb calculates, considering that initial parameter for diamonds
pressing is level of roughness, which taken by thin sharpening of the same surface with the same cutting
speed and submission.
The dependence graphs of the level of roughness Rа from the submission
S on the thin sharpening Rаsh, pressing Rаpr (with the constant value of the initial roughness Rаini = const)
and combined treatment Rаcomb presented on the fig. 1.
Figure 1 - The dependence graphs of the level of roughness Rа from the submission S on the thin sharpening Rаsh, pressing Rаpr (the initial roughness Rаini = const) and combined treatment Rаcomb |
On the combined treatment the initial value of the roughness taken
after the thin sharpening, that is initial roughness is changeable and reduce with the reducing of submission.
Therefore, the level of roughness, formed as a result of the combined treatment is lower, than on the usual
finishing-strength treatment by pressing, on conditions that Rаsh< Rаini. As a result, on the combined
treatment for the same submissions the lesser roughness of the surfaced layer could be reached, than on the
usual finishing-strength treatment. In that case, when Rаsh>Rаini, the parameter of roughness Rаcomb on the
combined treatment is getting larger, than on the usual pressing, what should take to the point, when the
treatment’s parameters are chose.
The graphs of the two-parameter dependences of the roughness Rа
from cutting speed V and submission S, which are presented in the fig. 2, let us to estimate the changing of the
roughness in changing of the cutting’s modes on the combined treatment sharpening and pressing. By the lines
of the level, on which values Rа are shown as the numbers, the correlation of the cutting speed and submission,
which are meet the given values of the roughness, could be also set.
Figure 2 – The graphs of the two-parameter dependences of the roughness Rа from cutting speed V and submission S in combined treatment |
The most quantity of the combined tool’s constructions have been
developed for combined treatment be cutting and surface-plastic deformation of the external cylindrical
surfaces [9].
The most simple scheme of such tool for combined treatment — is
combination of usual cutter with ball or roller deforming element. Here the deforming element could be
connected with cutting element strongly or elastic. The combined tool with the diamond presser, presented on
the fig. 3, is most simple construction of such type [13].
In the holder 1 due to screws in rectangular slot the cutter 2
is fasten, and in holder’s threaded hole screwing the thread bushing 3 with the fixed diamond presser 5
inside of the bushing. The tightness of the deforming element created by screwing or unscrewing the bushing
with diamond presser on the necessary size relative to the top of the cutter. There is the screw 4 for the
fixation of the presser in the required condition.
Figure 4 – The scheme of the combined tool’s work with the diamond presser |
In the working process there was based the suitability of the
application of the combined treatment thin sharpening and diamond pressing for tempered steel 45 by the
identifications of the treatment’s optimal parameters, which provides the necessary level of the roughness of
surfaced layer and burst performance. As a result there was a proof, that combined treatment provides the
lesser level of roughness of the surface, than on the usual finishing-strength treatment. There is presented
one of combined tool’s construction with the diamond presser in the work.
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http://masters.donntu.ru/2007/mech/petryaeva/diss/index.htm
Автореферат магистерской работы
Петряевой И.А. на тему: «Повышение качества обработки деталей машин с использованием комбинированных методов
обработки» - Донецк, ДонНТУ, 2007.
http://masters.donntu.ru/2007/mech/kuznetsova/diss/index.htm
Автореферат магистерской работы
Кузнецовой А.В. на тему: «Повышение эффективности обработки деталей машин с использованием современных
инструментальных материалов» - Донецк, ДонНТУ, 2007.
http://masters.donntu.ru/2005/mech/dubodelova/diss/index.htm
Автореферат магистерской работы
Дубоделовой О.С. на тему: «Повышение качества обработки деталей машин с использованием методов
поверхностно-пластического деформирования» - Донецк, ДонНТУ, 2005.
During the process of writing, the master’s work hasn’t completed yet. Final completion: December, 2009. The full text of work and materials on the theme could be received from the author or him scientific adviser after the indicated date. |
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