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Ocena obdelovalnosti in stroškov odrezavanja pri konvencionalnem in kriogenem frezanju jekla za poboljšanje 42CrMo4
Sraka, Rok (Author), Pušavec, Franci (Mentor) More about this mentor... This link opens in a new window

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Abstract
Pri kriogenem odrezavanju, ki se je izkazalo za trajnostno alternativo konvencionalni obdelavi, se namesto škodljivih emulzij na bazi olj uporabljajo kriogeni mediji, ki so dovedeni v rezalno cono v kapljevitem stanju. Kljub temu, da kriogeno odrezavanje ponuja številne prednosti pred konvencionalno obdelavo, še vedno ni povsem raziskan vpliv kriogenih medijev na obdelovalnost številnih materialov, ki se zelo pogosto uporabljajo v različnih industrijskih panogah. Zato diplomsko delo obsega analizo in oceno obdelovalnosti jekla za poboljšanje 42CrMo4 pri kriogenem frezanju ob asistenci sočasnega enokanalnega dovoda kapljevitega ogljikovega dioksida – LCO2 (ang. Liquid Carbon Dioxide – LCO2) in oljne megle – MQL (ang. Minimum Quantity Lubrication – MQL). Količino LCO2 in MQL se je med eksperimenti frezanja spreminjalo s ciljem ugotovitve najbolj primerne hladilne in mazalne sposobnosti LCO2 + MQL za dosego najdaljše obstojnosti orodja – frezala. Rezultati obstojnosti orodja pri kriogenem frezanju so bili primerjani z referenčnim konvencionalnim odrezavanjem z uporabo emulzij na bazi olj. Pri tem so bili vsi eksperimenti izvedeni z enakimi rezalnimi parametri, ter enako obdelovalno strategijo. Ugotovljeno je bilo, da je kriogeno frezanje obetaven alternativni postopek, ki je stroškovno primerljiv konvencionalnemu frezanju, podaljša obstojnost orodja, omogoča večji nadzor nad procesom in je čistejši za okolje, ter tako primeren za vpeljavo v industrijo.

Language:Slovenian
Keywords:odrezavanje, kriogeno frezanje, kapljeviti ogljikov dioksid – LCO2, sočasni enokanalni dovod LCO2 in MQL, obstojnost orodja, obdelovalnost materiala, jeklo za poboljšanje 42CrMo4
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Year:2019
Publisher:[R. Sraka]
Number of pages:XXII, 50 str.
UDC:621.941:669.14(043.2)
COBISS.SI-ID:16575003 Link is opened in a new window
Views:225
Downloads:106
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Secondary language

Language:English
Title:Estimation of machinability and machining costs for conventional and cryogenic milling of heat-treated steel 42CrMo4
Abstract:
In cryogenic machining, as a sustainable alternative to the conventional flood lubrication, harmful oil-based emulsions are replaced by cryogenic media, which are usually supplied into the cutting zone in the liquid state. Despite numerous advantages of the cryogenic machining in comparison with conventional flood lubrication, the best use of cryogenic media and their effect on various materials in different industrial branches remain open to research. Therefore, this diploma thesis is comprised of the analysis and evaluation of heat-treated steel 42CrMo4 in cryogenic milling assisted by a simultaneous single-channel supply of Liquid Carbon Dioxide (LCO2) and oil mist – MQL (Minimum Quantity lubrication – MQL). The aim of the experimental work was to determine the best possible cooling and lubricating effect of the LCO2 + MQL, which is necessary to achieve the longest tool life. Furthermore, the tool life in cryogenic machining was compared with an equivalent in conventional machining where oil-based emulsions were used. All experiments were conducted under the same machining parameters and with the same processing strategies. It has been established that cryogenic milling represents a promising alternative machining process which is also cost-comparable to conventional milling under flood lubrication conditions. In addition, it lengthens the tool life, enables greater processing control, is more environmentally friendly, and therefore suitable for the use in industry.

Keywords:machining, cryogenic milling, liquid carbon dioxide – LCO2, simultaneous single-channel supply of LCO2 and MQL, tool life, material machinability, heat-treated steel 42CrMo4

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