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    Tools Wear & Tools Life "Keausan Pahat": Sutopo Pendidikan Teknik Mesin Ft-Universitas Negeri Yogyakarta MARET 2012

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    M Nur Fuady
    This document discusses tool wear and tool life in machining. It defines tool wear modes like crater wear and flank wear. It shows graphs of how tool wear increases with cutting time and decreases with higher cutting speeds. The Taylor tool life equation relating tool life, cutting speed, and material properties is presented. Causes of tool damage like abrasion, chemical reactions, adhesion, diffusion, oxidation, plastic deformation, and cracking are listed. Finally, common tool life criteria based on flank wear or crater wear ratio are introduced.

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    Tools Wear & Tools Life "Keausan Pahat": Sutopo Pendidikan Teknik Mesin Ft-Universitas Negeri Yogyakarta MARET 2012

    Uploaded by

    M Nur Fuady
    26 views17 pages
    This document discusses tool wear and tool life in machining. It defines tool wear modes like crater wear and flank wear. It shows graphs of how tool wear increases with cutting time and decreases with higher cutting speeds. The Taylor tool life equation relating tool life, cutting speed, and material properties is presented. Causes of tool damage like abrasion, chemical reactions, adhesion, diffusion, oxidation, plastic deformation, and cracking are listed. Finally, common tool life criteria based on flank wear or crater wear ratio are introduced.

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    This document discusses tool wear and tool life in machining. It defines tool wear modes like crater wear and flank wear. It shows graphs of how tool wear increases with cutting time and decreases with higher cutting speeds. The Taylor tool life equation relating tool life, cutting speed, and material properties is presented. Causes of tool damage like abrasion, chemical reactions, adhesion, diffusion, oxidation, plastic deformation, and cracking are listed. Finally, common tool life criteria based on flank wear or crater wear ratio are introduced.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    26 views17 pages

    Tools Wear & Tools Life "Keausan Pahat": Sutopo Pendidikan Teknik Mesin Ft-Universitas Negeri Yogyakarta MARET 2012

    Uploaded by

    M Nur Fuady
    This document discusses tool wear and tool life in machining. It defines tool wear modes like crater wear and flank wear. It shows graphs of how tool wear increases with cutting time and decreases with higher cutting speeds. The Taylor tool life equation relating tool life, cutting speed, and material properties is presented. Causes of tool damage like abrasion, chemical reactions, adhesion, diffusion, oxidation, plastic deformation, and cracking are listed. Finally, common tool life criteria based on flank wear or crater wear ratio are introduced.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 17

    TOOLS WEAR & TOOLS LIFE

    “KEAUSAN PAHAT”

    SUTOPO
    PENDIDIKAN TEKNIK MESIN
    FT-UNIVERSITAS NEGERI YOGYAKARTA
    MARET 2012

    1
    Nomenclature of Turning tool
    (DIN 6581)

    2
    Tool
    wear

    Crater wear Flank wear

    3
    Tool Wear vs. Time

    Tool wear as a function of cutting time. Flank wear


    (FW) is used here as the measure of tool wear.
    4
    Pengaruh Cutting Speed

    Effect of cutting speed on tool flank wear (FW) for three cutting
    speeds, using a tool life criterion of 0.50 mm flank wear.
    5
    Tool Life vs. Cutting Speed

    Natural log-log plot of cutting speed vs tool life.

    6
    Taylor Tool Life Equation

    vT n
    C
    where v = cutting speed; T = tool life; and n
    and C are parameters that depend on feed,
    depth of cut, work material, tooling material,
    and the tool life criterion used
     n is the slope of the plot
     C is the intercept on the speed axis at one
    minute tool life
    7
    Penyebab kerusakan pahat

    Keausan yg tumbuh membesar

    Retak yg menjalar hingga muncul patahan


    pada mata potong

    Deformasi plastik yg mengubah


    bentu/geometri 8
    Tool wear modes 9
    Tool life of coated and uncoated tools in micro
    milling of hardened tool steels
    10
    Mekanisme kerusakan dan
    keausan pahat
    • Proses abrasif
    • Proses kimiawi
    • Proses adhesi
    • Proses difusi
    • Proses oksidasi
    • Proses deformasi plastik
    • Proses keretakan dan kelelahan
    11
    Contoh grafik pengujian keausan pahat

    12
    Tool Life/ Umur Pahat
    • Batas waktu kemampuan pahat untuk dapat
    melakukan pemotongan secara efektif
    • Seiring tumbuh dan berkembangnya
    keausan sejalan dengan waktu pemotongan,
    maka batas waktu penggunaan pahat secara
    efektif telah habos

    13
    Kriteria umur pahat
    • Semakin besar keausan/kerusakan, kondisi
    pahat akan semakin kritis
    • Apa yang terjadi jika pahat tetap
    difungsikan?
    – Gaya pemotongan akan sangat tinggi dan
    dapat menyebabkan kerusakan tool secara
    keseluruhan, benda kerja, mesin dan
    membahayakan keselamatan operator
    14
    Pengaruh keausan pahat
    • increased cutting forces....
    • increased cutting temperatures
    • poor surface finish
    • decreased accuracy of finished part

    15
    Perlu kriteria umur pahat
    Berdasarkan:
    • Keausan flank (VB= 0,3 mm)
    • Atau rasio keausan kawah
    (K= KT/KM)

    16
    Kriteria umur pahat

    17

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