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    Improvement of Chip Breaking in Machining Low Carbon Steel by Cryogenically Precooling the Workpiece

    Source: Journal of Manufacturing Science and Engineering:;1998:;volume( 120 ):;issue: 001::page 76
    Author:
    Y. Ding
    ,
    S. Y. Hong
    DOI: 10.1115/1.2830113
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Ductile materials such as AISI1008 low carbon steel characteristically exhibit poor chip breaking in conventional machining practices. This paper presents an environmentally clean cryogenic machining process which improves the breakability of AISI1008 chips by lowering the chip temperature to its embrittlement temperature. In this study, the brittle-ductile transition temperature of AISI1008 was experimentally determined to be between −60°C and −120°C. The discussion is focused on whether the chip can reach the embrittlement temperature before it hits an obstacle. A finite element simulation predicted the chip temperatures under various cutting conditions. Liquid nitrogen (LN2) was used to prechill the workpiece cryogenically. The results from the cutting tests indicate a significant improvement in chip breakability for different feeds and speeds by using this cooling technique. However, the effectiveness of cryogenetically prechilling the workpiece was found to be heavily dependent on cutting speed.
    keyword(s): Machining , Carbon steel , Temperature , Cutting , Embrittlement , Nitrogen , Cooling , Brittleness , Simulation , Phase transition temperature AND Finite element analysis ,
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      Improvement of Chip Breaking in Machining Low Carbon Steel by Cryogenically Precooling the Workpiece

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    http://yetl.yabesh.ir/yetl1/handle/yetl/120803
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    contributor authorY. Ding
    contributor authorS. Y. Hong
    date accessioned2017-05-08T23:57:18Z
    date available2017-05-08T23:57:18Z
    date copyrightFebruary, 1998
    date issued1998
    identifier issn1087-1357
    identifier otherJMSEFK-27316#76_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/120803
    description abstractDuctile materials such as AISI1008 low carbon steel characteristically exhibit poor chip breaking in conventional machining practices. This paper presents an environmentally clean cryogenic machining process which improves the breakability of AISI1008 chips by lowering the chip temperature to its embrittlement temperature. In this study, the brittle-ductile transition temperature of AISI1008 was experimentally determined to be between −60°C and −120°C. The discussion is focused on whether the chip can reach the embrittlement temperature before it hits an obstacle. A finite element simulation predicted the chip temperatures under various cutting conditions. Liquid nitrogen (LN2) was used to prechill the workpiece cryogenically. The results from the cutting tests indicate a significant improvement in chip breakability for different feeds and speeds by using this cooling technique. However, the effectiveness of cryogenetically prechilling the workpiece was found to be heavily dependent on cutting speed.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleImprovement of Chip Breaking in Machining Low Carbon Steel by Cryogenically Precooling the Workpiece
    typeJournal Paper
    journal volume120
    journal issue1
    journal titleJournal of Manufacturing Science and Engineering
    identifier doi10.1115/1.2830113
    journal fristpage76
    journal lastpage83
    identifier eissn1528-8935
    keywordsMachining
    keywordsCarbon steel
    keywordsTemperature
    keywordsCutting
    keywordsEmbrittlement
    keywordsNitrogen
    keywordsCooling
    keywordsBrittleness
    keywordsSimulation
    keywordsPhase transition temperature AND Finite element analysis
    treeJournal of Manufacturing Science and Engineering:;1998:;volume( 120 ):;issue: 001
    contenttypeFulltext
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