ROUGHNESS OF PROCESSED SURFACES UNDER ABRASIVE POLISHING
The obtained analytical dependences for determining the basic parameters of the surface roughness during abrasive polishing are presented with modeling the cutting grains in the form of a sphere and considering the ordered arrangement of grains. It is shown that with a decrease in the thickness o...
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| Format: | Article |
| Language: | English |
| Published: |
Academica Brancusi
2017-12-01
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| Series: | Fiabilitate şi Durabilitate |
| Subjects: | |
| Online Access: | http://www.utgjiu.ro/rev_mec/mecanica/pdf/2017-02/22_VALENTIN%20SHKURUPY%20-%20ROUGHNESS%20OF%20PROCESSED%20SURFACES%20UNDER%20ABRASIVE%20POLISHING.pdf |
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| Summary: | The obtained analytical dependences for determining the basic parameters of the
surface roughness during abrasive polishing are presented with modeling the cutting grains in the
form of a sphere and considering the ordered arrangement of grains. It is shown that with a
decrease in the thickness of the cut, the ratio of the altitude parameters of the surface roughness
max Ra R /
increases, reaching values of 20 ... 30 and more. This is consistent with the
experimental data obtained by abrasive polishing. Consequently, the modeling of abrasive grains
in the form of a sphere is more in line with the actual conditions for the formation of surface
roughness in both abrasive polishing and grinding. Calculations established that the process of
abrasive polishing proceeds under conditions corresponding to the transition from the cutting
process to the process of friction of the grain with the material being processed. It is also shown
that with the reduction of the ratio
max Ra R /
to 4 ... 6 (corresponding to the grinding conditions),
the process of metal removal and the formation of surface roughness occurs in a stable cutting
process. This establishes a close relationship of the relationship
max Ra R /
with the ratio of the
thickness of the cut and the radius of rounding of the cutting edge of the abrasive grain. It has
been experimentally established that when the ball is smoothed out, the ratio
max Ra R /
= 14.2, and
Ra
= 0.1 mkm. At fine turning with a diamond tool
max Ra R /
= 21.2, and
Ra
= 0.1 micron. When
abrasive polishing
max Ra R /
= 30, and
Ra
= 0.1 micron. The obtained results of theoretical and
experimental studies indicate the possibility of a significant decrease in the surface roughness in
abrasive polishing, which opens up new technological possibilities for its practical use. |
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| ISSN: | 1844-640X 1844-640X |