Freesimise mõju materjali pinnale AISI 316L näitel
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Kuupäev
2017
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Käesoleva magistritöö eesmärgiks oli uurida freesimise mõju materjali pinnale AISI316L
näitel. Selleks töötati välja katsemetoodika lõikeparameetrite ning materjali
pinnakvaliteedi näitajate vahelisi seoseid hindamiseks. Töös mõõdeti kolme pinna
kvaliteeti kirjeldavat omadust: jääkpinged, pinnakaredus ja lõikejõud. Uurimustöös
hinnati kahe tehtud katse peale kokku 42 katsekeha. Saadud andmete analüüsiks kasutati
programmi Modde Pro, kus võrreldi eelnevalt koostatud mudeli abil ennustatud tulemusi
leitud väärtustega. Katsetulemused näitasid, et enamasti mõjutas freesimisel
pinnaomadusi ettenihke, seejärel lõikesügavuse muutmine. Kõige vähem avaldas mõju
lõikekiirus. Lisaks uuriti jääkpingete analüüsis jääkpingete profiili, millega sooviti näidata
töötluse käigus materjalis tekkinud plastseid deformatsioone ja nende ulatust. Tehtud
analüüsist selgus, et jääkpinged esinevad ainult materjali pindmises kihis, kus
lõiketöötluse tagajärel on toimunud materjali deformeerimine. Kuigi uurimustöös kasutati
materjali AISI 316L, siis saadud järeldused kehtivad kõigi rootevaba teraste töötlemisel
freesimise teel.
The aim of the Master’s thesis was to investigate the effect of milling upon material surface integrity based on AISI 316L. The method of the experiment was developed to explain various relations between cutting parameters and material surface integrity. Residual stresses, surface roughness and cutting forces were measured to describe surface integrity. A total of 42 test pieces were processed and analysed. Data analysis was made with Modde Pro program where predicted results were compared with received values. Given results showed that mainly cutting feed effect surface integrity in milling. The other parameter that influenced surface integrity was cutting depth. The least impact gave cutting speed value. In addition the residual stress depth profile was measured to assess a value of the deformation and how deep in the material residual stresses was found. As a result there were discovered that residual stresses are mainly found in materials surface layer. Also material surface was slightly deformed causing residual stresses to lock into material. Though the used material in the study was AISI 316L all findings are valid in different types of stainless steel.
The aim of the Master’s thesis was to investigate the effect of milling upon material surface integrity based on AISI 316L. The method of the experiment was developed to explain various relations between cutting parameters and material surface integrity. Residual stresses, surface roughness and cutting forces were measured to describe surface integrity. A total of 42 test pieces were processed and analysed. Data analysis was made with Modde Pro program where predicted results were compared with received values. Given results showed that mainly cutting feed effect surface integrity in milling. The other parameter that influenced surface integrity was cutting depth. The least impact gave cutting speed value. In addition the residual stress depth profile was measured to assess a value of the deformation and how deep in the material residual stresses was found. As a result there were discovered that residual stresses are mainly found in materials surface layer. Also material surface was slightly deformed causing residual stresses to lock into material. Though the used material in the study was AISI 316L all findings are valid in different types of stainless steel.
Kirjeldus
Magistritöö
Tootmistehnika õppekaval
Märksõnad
magistritööd, roostevaba teras, freesimine, jääkpinge