Caracterização da Rugosidade de Superfície - ucs.br .• Rugosidade • Tolerâncias dimensionais

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  • Microscopia 3D (WLI) Caracterizao da Rugosidade de Superfcie

  • 04/07/2018 2 Bruker Confidential

    Pastilha de freio

    aumento de 5x.

  • Representao em escala de cores

    04/07/2018 3 Bruker Confidential

  • Desgaste

    04.07.2018 4

    perda de massa da superfcie de um material slido por interao mecnica com outro corpo em contato

    Desgaste = Textura de Superfcie + Movimento + Presso/Calor

  • Acabamento de superfcies

    04.07.2018 5

    Processos mecnicos com remoo de material Processos qumicos e eletroqumicos

    Recobrimentos

    Esttica

    Liberao ou introduo de esforos mecnicos

    Nvel de limpeza e esterilidade

    Propriedades mecnicas de superfcie

    Proteo contra a corroso

    Rugosidade

    Tolerncias dimensionais de alta preciso

  • Textura da superfcie

    04.07.2018 6

    Forma Ondulao Rugosidade

  • Por que Microscpios pticos 3D?

    MEMS

    Eletronica

    Orthopedics

    Metrologia de

    texturas

    Microscpios pticos 3D

    proporcionam

    Metrologia rpida e precisa

    No-contato, no-destrutiva

    Mais de 1000 anlises

    Estvel

    Dados independentes de operador

  • 04.07.2018 8

    Aplicaes

    Pesquisa e Desenvolvimento

    Quantificar texturas

    Quantificar desgaste

    Desenvolvimento de Processos

    Definir processos de fabricao

    Design para alto desempenho

    Produo

    Garantir qualidade de produto

    Monitorar processos de fabricao

    Anlise de Qualidade

    Investigao de falhas

    Design para maior vida til

    Setor Automotivo

    Engrenagens

    Rolamentos e vedaes

    Eixos de comando de vlvulas

    Setor Mdico

    Implantes

    Femorais

    Coluna

    Quadril

    Endoprteses aorticas

    Setor Aerospacial

    Lminas de turbinas

    Engrenagens

    Rolamentos e vedaes

  • 3D Microscopy - Two Modes Address Rough and Smooth Samples

    7/4/2018 9

    Phase Shifting

    Interferometry PSI

    - Green LED

    White Light Interferometry WLI

    - White HBLED

  • 3D Microscopy - Two Modes Address Rough and Smooth Samples

    Vertical resolution ~3 nm

    Steps or surface variations up to 10 mm

    Surfaces with rough/steep surfaces

    Vertical resolution

  • 11

    Testando Superfcies Planas

    O espelho de referncia realmente plano?

    Franjas

    - Visualmente aparenta ser perfeitamente

    plano.

    Mapa Fase

    - Revela que as frentes de onda no so perfeitamente planas.

    Aqui a rugosidade pico-vale est

    na ordem de poucos nm.

  • 12

    Principles of PSI Operation

    The fringes are shifted by fringe/4

    Resultant arrays of intensity solved for Phase.

    Phase is converted to surface height.

  • 13

    Is my sample smooth? Is the rms less than 30nm?

    Visual assessment Is my sample shiny?

    Does my sample have steps? Are they less than 140nm?

    Can my sample be measured with PSI mode?

    No problem measuring even 1nm steps

    http://www.google.com/url?sa=i&source=images&cd=&cad=rja&docid=WGH7OqeSMV40lM&tbnid=PziujF5h4PYuIM:&ved=0CAgQjRwwAA&url=http://vjones9.blogspot.com/2010/10/public-art.html&ei=UPPHUa-XL_Ho0wGKxYDgAQ&psig=AFQjCNH66xVudmRmWOt55O4xWufkcAkQaw&ust=1372144848815033

  • VSI

    Varredura ptica 3D Medio de um degrau

    Amostra com um degrau

    7/4/2018 Bruker Confidential 14

  • WLIM 3D Optical Microscope Key Point Sharp Coherence Signal, Sharp at All Magnifications

    7/4/2018 15 Bruker Confidential

    Practical Implication: Highest accuracy data on areas

    of interest obtained fastest at lowest magnifications

    Great where a large area with good resolution is

    required, speed is critical

  • 7/4/2018 16

    Distncia Transversal

    Distncia de Avaliao

    Distncia de Amostragem

    Perfil de Rugosidade Aps Remoo Forma &

    Ondulao

    Tradicionalmente obtida via perfilmetro de contato

    Porque Ra?...Padro ......Limites da tecnologia de 1930...

    Metrologia 2D de Superfcie Rugosidade Ra ainda padro

  • 7/4/2018 17

    Peaks/Valleys .. Rp,Rv, Rt, Rz, Pc.... (e.g. Stylus X Rp)

    Rp

    Rv

    Rp = Highest Point From Mean Line

    Rv=Lowest Point from Mean Line

    Rt = Rp - Rv = Peak to Valley

    Rpi = Highest Peak from mean line in ith sampling length

    Rti = Highest - Lowest points from mean line in ith Sampling length Peak to Valley

    Rpm= Average of all Rpi

    Rmax = Maximum Rti over evaluation length

    Metrologia 2D de Superfcie Parmetros de Amplitude

  • Metrologia 2D de Superfcie Parmetros Estatsticos

    7/4/2018 18

    Clculo dos momentos da distribuio:

    Rq = RMS, =

    Rsk = Skew , Skewness =

    Rku = Kurtosis =

    LdxxZ

    LqR

    0

    )(1 2

    dxL

    xZLRq

    skR

    0

    )(33

    1

    dxL

    xZLRq

    kuR

    0

    )(44

    1

    Parmetros muito teis e conhecidos

    Porm no informam sobre a estrutura espacial

  • 04.07.2018 19

    Pastilhas de freio Controle de Qualidade

    Processo similar resultou em texturas diferentes

    Uso de parmetros 3D proporciona oportunidade de aprimorar o controle de rudo e vibrao

    Ra dentro da espec. Resultado: ruidoso

    Ra dentro da espec. Resultado: silencioso

    Dois discos possuam Ra dentro das especificaes, mas um apresentava rudo, enquanto outro no.

  • 2D and 3D Surface Texture Analyses Standardization for Best Correlation

    7/4/2018 20

    2D amplitude and statistical parameters are great metrology tools, but do not provide structure/spatial information

    3D areal (S-parameters) have been developed to take advantage of computational power and describe structure

    Structural information has been shown to relate to functional surface performance (shafts, friction plates, seals, etc.)

    The analyses include some math (e.g., filtering) which warrants a brief introduction before describing the 3D parameters in detail

  • 7/4/2018 21

    3D Surface Texture Metrology Brief Overview/History

    1930s First 2D instruments for texture analogue, charts etc.

    1960s Digital Computers parameter development 3D machines

    1968 The Properties and Metrology of Engineering Surfaces U. of Oxford.

    1979 1st of Triennial International Conferences

    1990s Workshops indicating a need to standardize 3D parameters

    2000s SurfStand, AutoSurf, CalStandNew ISO standard WG16ISO/DIS 25178-2

    How can we get spatial

    information in addition to

    2D like information?

  • 7/4/2018 22

    Roughness 2D and 3D Descriptions: Well DefinedBut No Spatial Information

    X

    Y Z Surface Roughness, Ra (Sa) is the average of the absolute

    value of profile heights over a given length (area).

    dxdyyxZA

    S

    LxLy

    a 00

    ),(1

    L

    dxxZL

    R

    L

    a 0

    )(1

    2D

    3D

    Surface Texture (Surface Roughness, Waviness and Lay)

    ANSI/ASME B46.1, 2009, American Society of Mechanical Engineers, NY, New York 10017.

  • 7/4/2018 23 Bruker Confidential

    Ao Carbono 1060

    Amostra Cupom padro estudos de corroso

  • Amostra rea corroda aumento de 2,8X

    7/4/2018 24 Bruker Confidential

  • Amostra rea no corroda aumento de 2,8X

    7/4/2018 25 Bruker Confidential

  • Amostra comparao aumento de 2,8X

    7/4/2018 26 Bruker Confidential

    regio

    sem corroso

    regio

    com corroso

    Parmetros de rugosidade 3D

    so uma ordem de magnitude

    maiores na rea corroda

    Mesma escala vertical:

    7/4/2018 26 Bruker Confidential

  • 7/4/2018 27

    Texture and Roughness: Surfaces Have Different Characteristics

    These two surfaces have identical Ra (Sa)

    Surfaces are different functionally

    3D areal parameters (S-parameters) have been developed to

    capture the differences in a quantifiable way

  • 7/4/2018 28

    3D Surface Texture Parameters Height Parameters (Sa, Sq)

    Sa: Surface Average Roughness

    Sq: Surface RMS Roughness

    Both A and B have:

    Sa = 16.03nm and Sq= 25.4nm

  • 7/4/2018 29

    Clutch Separator/Friction Plate Example Sa, Sbi, Sci, Svi Metrics

    Sa = 1.2 um

    Sbi=0.70

    Sci=1.31

    Svi =0.12

    Sa = 4.2um

    Sbi=1.43

    Sci=0.46

    Svi =0.23

    Separator Plate Friction Plate

  • 7/4/2018 30

    Wear of Cylinder Bore Worn Doesnt Mean Broken!

    Sbi 0.69

    Sci 1.29

    Svi 0.15

    Sm 2.5 x 10-5

    Sc 8.0 x 10-4

    Sv 1.1 x 10-4

    Unworn Bore Worn Bore

    Sbi 0.70

    Sci 1.32

    Svi 0.11

    Sm 8.3 x 10-6

    Sc 1.5 x 10-4

    Sv 1.8 x 10-5

    1 mm

    Note similar functional surface parameters for both cases

  • 7/4/2018 31

    Shaft- Unworn Sa 368nm

    Sds 1130 /mm2

    Ssc 49 mm-1 (radii 20mm)

    Sa 769 nm

    Sds 247 /mm2

    Ssc 6 mm-1 (radii 166 mm)

    Shaft- worn

    600 mm

    Sealing Surface Example Sds/Ssc monitored for failure (leak) prediction

  • Superfcie de alumnio Imagem individual - aumento de 5X

    7/4/2018 32 Bruker Confidential

  • Superfcie de alumnio Imagem individual