Analysis of the parts' roughness parameters of high-speed printing equipment by optical profilometry

Studying the Impact of the Roughness of the Tool Surface Formed by Ultrasonic Exposure on the Roughness of the Holes being Machined

Materials Science Forum ◽

10.4028/www.scientific.net/msf.973.166 ◽

2019 ◽

Vol 973 ◽

pp. 166-169

Author(s):

Sergey I. Agapov ◽

Yuriy I. Sidyakin ◽

Oleg F. Korpelyanskiy

Keyword(s):

High Speed ◽

Roughness Parameters ◽

Tool Surface ◽

Ultrasonic Techniques ◽

The Impact

This article investigates the impact that the rake and rear faces of the drill made from high-speed steels of grade P6M5 and grinded by ultrasonic techniques imposes on the roughness of the holes being machined. The experiment showed that microgeometry of the tool sharpened by transmitting ultrasonic impulses into the zone of regrinding featured lower roughness; moreover, roughness parameters of the drilled holes were also improved.

Download Full-text

Surface Quality Assessment after Milling AZ91D Magnesium Alloy Using PCD Tool

Materials ◽

10.3390/ma13030617 ◽

2020 ◽

Vol 13 (3) ◽

pp. 617 ◽

Cited By ~ 3

Author(s):

Ireneusz Zagórski ◽

Jarosław Korpysa

Keyword(s):

Surface Roughness ◽

Magnesium Alloy ◽

High Speed ◽

Cutting Speed ◽

Cutting Parameters ◽

Depth Of Cut ◽

Machining Parameters ◽

Roughness Parameters ◽

Operational Parameters

Surface roughness is among the key indicators describing the quality of machined surfaces. Although it is an aggregate of several factors, the condition of the surface is largely determined by the type of tool and the operational parameters of machining. This study sought to examine the effect that particular machining parameters have on the quality of the surface. The investigated operation was the high-speed dry milling of a magnesium alloy with a polycrystalline diamond (PCD) cutting tool dedicated for light metal applications. Magnesium alloys have low density, and thus are commonly used in the aerospace or automotive industries. The state of the Mg surfaces was assessed using the 2D surface roughness parameters, measured on the lateral and the end face of the specimens, and the end-face 3D area roughness parameters. The description of the surfaces was complemented with the surface topography maps and the Abbott–Firestone curves of the specimens. Most 2D roughness parameters were to a limited extent affected by the changes in the cutting speed and the axial depth of cut, therefore, the results from the measurements were subjected to statistical analysis. From the data comparison, it emerged that PCD-tipped tools are resilient to changes in the cutting parameters and produce a high-quality surface finish.

Download Full-text

Numerical analysis of high-speed wheel/rail adhesion under interfacial liquid contamination using an elastic-plastic asperity contact model

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/1350650116645025 ◽

2016 ◽

Vol 231 (1) ◽

pp. 63-74

Author(s):

Bing Wu ◽

Tao Wu ◽

Zefeng Wen ◽

Xuesong Jin

Keyword(s):

Surface Roughness ◽

High Speed ◽

Present Model ◽

Temperature Fields ◽

Elastic Model ◽

Asperity Contact ◽

Roughness Parameters ◽

Slip Ratio ◽

Elastic Plastic ◽

Train Speed

The objective of this paper is to investigate the high-speed wheel/rail adhesion under interfacial liquids contamination using a numerical model. This model considers the rheological property of interfacial liquids, elastic-plastic deformation of microasperities contact and the temperature across the film thickness. The pressure and the temperature fields can be obtained. The effects of train speed, surface roughness parameters, characteristic shear stress, and the slip ratio are investigated. Furthermore, the present model is compared with the elastic model and the elastic-plastic model without considering the thermal effect. The numerical results show that the train speed and temperature affects the wheel/rail adhesion significantly.

Download Full-text

Determination of Surface Roughness Parameters by Optical Profilometry and Sand Patch Test

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.259.15 ◽

2017 ◽

Vol 259 ◽

pp. 15-20 ◽

Cited By ~ 2

Author(s):

Đorđe Čairović ◽

Martin Zlámal ◽

Petr Štěpánek ◽

Tomáš Trčka ◽

Pavel Škarvada ◽

...

Keyword(s):

Surface Roughness ◽

Surface Treatment ◽

Surface Topography ◽

Patch Test ◽

Shear Resistance ◽

Optical Profilometry ◽

Roughness Parameters ◽

Sand Patch ◽

Non Destructive

In cases when two concrete parts are cast against in different times are not connected by dowels, main contributors to the resistance are cohesion and friction. Shear resistance of the interface is highly dependent on surface treatment and its roughness. In this paper, besides the review of available methods of surface roughness determination, the optical profilometry will be introduced and described. Optical profilometry represents non-contact and non-destructive method for characterizing surface topography. Furthermore, results obtained by abovementioned method will be compared with Sand Patch Test, in order to determine its usability and limitations.

Download Full-text

Enamel and Dentin Surface Finishing Influence on the Roughness and Microshear Bond Strength of a Lithium Silicate Glass-Ceramic for Laminate Veneers

International Scholarly Research Notices ◽

10.1155/2015/243615 ◽

2015 ◽

Vol 2015 ◽

pp. 1-7

Author(s):

Carla Castiglia Gonzaga ◽

Ruth Peggy Bravo ◽

Thiago Vinícius Pavelski ◽

Paula Pontes Garcia ◽

Gisele Maria Correr ◽

...

Keyword(s):

Bond Strength ◽

Silicate Glass ◽

Glass Ceramic ◽

High Speed ◽

Surface Finishing ◽

Lithium Silicate ◽

Cavity Surface ◽

Roughness Parameters ◽

Microshear Bond Strength ◽

Lithium Silicate Glass

Objectives. This study evaluated the influence of cavity surface finishing with diamond burs of different grit mounted on high-speed turbine and ultrasound on the roughness and microshear bond strength (MBS) of a lithium silicate glass-ceramic to enamel and dentin. Methods. Enamel and dentin specimens were divided into seven groups, according to the type of surface finishing: 1200-grit sandpaper (control), two different brands of medium-grit and fine-grit diamond burs in a high-speed turbine; medium-grit and fine-grit CVD (chemical vapor deposition) tips in an ultrasonic device. Roughness parameters (n=5) and MSBS to a glass-ceramic (n=10) were determined. Data were analyzed using ANOVA and Tukey’s test (α = 5%). Results. Control group showed lower mean roughness readings and groups that used medium-grit diamond burs showed the highest mean roughness values. Regarding MSBS, there was no statistical difference when comparing the groups gritted with the same brand of medium- and fine-grit burs and tips. Conclusions. Cavity surface finishing influenced the roughness parameters and MSBS of a glass-ceramic to enamel and dentin. Medium-grit diamond burs in high-speed turbine showed the highest mean roughness values. Fine-grit CVD tips in ultrasound presented the highest MSBS values for both enamel and dentin.

Download Full-text

Surface Characteristics and Color Stability of Gingiva-Colored Resin Composites

Materials ◽

10.3390/ma13112540 ◽

2020 ◽

Vol 13 (11) ◽

pp. 2540

Author(s):

Aikaterini Petropoulou ◽

Maria Dimitriadi ◽

Spiros Zinelis ◽

Aspasia Sarafianou ◽

George Eliades

Keyword(s):

Red Wine ◽

Roughness Parameter ◽

Color Stability ◽

Surface Characteristics ◽

Color Difference ◽

Storage Conditions ◽

Resin Matrix ◽

Resin Composites ◽

Optical Profilometry ◽

Roughness Parameters

The purpose of this study was to investigate the surface characteristics and color stability of gingiva-colored composite restorative materials (Anaxgum—ANG, Ceramage—CMG and Gradia Gum—GRG). The microstructure, composition, degree of conversion (DC %) and 3D roughness (Sa, Sz, Sdr, Sc) were examined by LV-SEM/EDS, ATR-FTIR and optical profilometry, respectively. For the color stability (CIE L*, a*, b* system) and hardness (HV), measurements were performed at baseline and after 30 days storage in distilled water, coffee and red wine. The ANG and GRG contain prepolymerized particles in aromatic and aliphatic resin matrices, respectively, whereas CMG contains inorganic zirconia silicate/silica particles, in an aromatic resin matrix, with a smaller particle size and a higher surface area fraction. Urethane monomers were mainly identified in CMG and GRG. The DC% showed statistically insignificant differences between the materials. The same applied for the roughness parameters, except for the greatest Sdr in CMG. ANG showed a color difference (ΔE) of > 3.3 after immersion in all media, CMG in coffee and wine and GRG only in coffee. Sc was the only roughness parameter demonstrating correlations with the ΔL*, Δb* and ΔE*. The HV values showed insignificant differences between the storage conditions per material. There are important differences in the color stability of the materials tested, which were mostly affected by the roughness parameters due to variations in their microstructure.

Download Full-text

ELECTROPOLISHING OF ADDITIVELY MANUFACTURED HIGH CARBON GRADE 316 STAINLESS STEEL

10.31224/osf.io/5dn49 ◽

2018 ◽

Author(s):

Pawan Tyagi ◽

Tobias Goulet ◽

Christopher Riso ◽

Kate Klein ◽

Francisco Garcia-Moreno

Keyword(s):

Stainless Steel ◽

Surface Finishing ◽

Optical Profilometry ◽

Roughness Parameters ◽

High Carbon ◽

Water Contact ◽

316 Stainless Steel ◽

Surface Optical ◽

Surface Improvement

Improving surface finishing is the critical step in the application of an additively manufactured (AM) component. This paper provides insights into the electropolishing route for the surface improvement of the AM component made up of 316 stainless steel with >6% carbon. We have discussed the Taguchi design of experiment-based process optimization to understand the role of various process parameters. Profilometry and scanning electron microscopy were performed to study the electropolished and unpolished areas of the AM components. Optical profilometry provided an estimate of the amount of material to be removed to achieve shining and smooth AM surface. Optical profilometry also provided analysis of several roughness parameters on the electropolished surface. Electropolishing was effective in reducing the surface roughness below ~0.1 µm RMS. This sub µm RMS roughness makes an AM component suitable for major engineering applications. SEM showed distinctively different microstructure on the electropolished surface. We also conducted water contact angle study and spectroscopic reflectance study on electropolished and unpolished AM component surface. Our study revealed that electropolishing is a highly promising route for improving the surface finishing of AM components.

Download Full-text

Reactivity and Bond Strength of Universal Dental Adhesives with Co-Cr Alloy and Zirconia

Dentistry Journal ◽

10.3390/dj7030078 ◽

2019 ◽

Vol 7 (3) ◽

pp. 78

Author(s):

Dimitris Papadogiannis ◽

Maria Dimitriadi ◽

Maria Zafiropoulou ◽

Maria-Dimitra Gaintantzopoulou ◽

George Eliades

Keyword(s):

Bond Strength ◽

Shear Bond Strength ◽

Resin Composite ◽

Optical Profilometry ◽

Roughness Parameters ◽

Infrared Microscopy ◽

Weibull Statistics ◽

Dental Adhesives ◽

Cobalt Chrome

The aim of this study was to evaluate (a) the reactivity of six universal dental adhesives with polished cobalt-chrome (Co-Cr) alloy and zirconia (3Y-TZP) surfaces; and (b) to assess the shear bond strength (SBS) of a resin composite with polished and alumina-blasted surfaces as mediated by these adhesives. The products tested were Adhese Universal (AD), All-Bond Universal (AB), Clearfill Universal Bond (CB), G-Premio Bond (GP), Prelude One (PO) and Scotchbond Universal (SB). The reactivity on polished substrates was evaluated by reflection infrared microscopy (RFTIRM). The roughness parameters of polished and 50 μm alumina grit-blasted surfaces were assessed by optical profilometry. The SBS of the composite bonded to the substrates treated with each adhesive (n = 10/product) was evaluated after 1 week of storage (H2O/37 °C) by Weibull statistics. Evidence of phosphate interaction with polished substrates was obtained by FTIRM, with higher peaks on the alloy. Alumina-blasting increased all roughness parameters with higher values on the alloy. AD, CB were the strongest (σ0) treatments on alloy surfaces and AD, CB, AB, SB on zirconia. GP was the weakest on both substrates and the least reliable (β) on alloy. On polished alloy GP, PO performed better (σ0), whereas on zirconia there were no significant differences. All adhesives showed more prominent reaction with the Co-Cr alloy than with 3Y-TZP.

Download Full-text