Investigation of CO2 laser beam modulation by rotating polygon

Luo, Xiaobing; Wang, Ying; Chen, Peifeng; Zhou, Le

doi:10.1016/j.optlaseng.2010.08.006

Cited by 16 publications

(4 citation statements)

References 10 publications

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“…In comparison with an infrared laser, the solid-state pulsed UV laser is less expensive, faster and can reduce surrounding surface overheating. Research by Luo et al [52] has improved the efficiency and quality of CO2 LST by using beam moderating system based on rotating polygon and able to achieve a nearly circular shape of a micro dimple. Ezhilmaran et al [30] uses narrow pulsed width LST at 5-6 nanosecond using Q switched, pulsed Nd3+: YAG laser which is opposed to usual LST method that is using pulse width ranging around few hundred nanoseconds.…”

Section: Laser Surface Texturingmentioning

confidence: 99%

A Review of Surface Texturing in Internal Combustion Engine Piston Assembly

Azmi¹,

Mahmood²,

Ghani³

et al. 2020

IJIE

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This paper presents a brief review of surface texturing with a focus on piston assembly application. The paper begins with a general discussion on surface texturing and the manufacturing process of micro dimples. Further, it discusses the theory of hydrodynamic lift generation and the effect of parameters of micro dimples texture on the surface-to-surface friction. Finally, the effect of surface texturing on heat transfer is briefly discussed. In pursuits to improve internal combustion engine (ICE) efficiency, tribological improvement of moving surfaces by means of micro surface texturing seems to be one of the way. However, texturing parameters have to be carefully designed as it can cause detrimental effect if the designs are wrong. Studies has shown micro surface texturing at piston ring could reduce friction around 20%-50% compare with un-textured piston ring and also reduce fuel consumption at 4%. Micro Surface texturing could also improve heat transfer between the surfaces to reduce piston slap and lubrication oil temperature. As reports on the surface texturing on friction reduction and heat transfer improvement in piston assembly are relatively scarce, it is suggested that optimization of micro dimple parameters for piston skirt application and its effect on engine tribology and heat transfer characteristics to be further investigated.

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Section: Laser Surface Texturingmentioning

confidence: 99%

A Review of Surface Texturing in Internal Combustion Engine Piston Assembly

Azmi¹,

Mahmood²,

Ghani³

et al. 2020

IJIE

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“…In this optical subsystem, these imaging part rays can be characterized by their second-order intensity moments [18,19], and the width of the slit image on primary plane is obtained as the following:…”

Section: B Measuring Principle and Analysismentioning

confidence: 99%

Three-dimensional measuring technique for surface topography using a light-sectioning microscope

et al. 2012

Self Cite

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Three-dimensional (3D) surface topographic analysis, measurement, and assessment techniques have raised great interest not only among researchers but also among industrial users. Many industrial processes and applications are directly influenced by the small-scale roughness of surface finishes. This paper describes the development and implementation of a noncontact, three-dimensional, microtopography measuring system. The instrument is formed by combining a modified light-sectioning microscope subsystem with a computer subsystem. In particular, optical system characteristics of the light-sectioning microscope are investigated, and a textured steel sheet is measured to demonstrate good practical outcomes. Details of measuring processes and image processing algorithms are provided, such as procedures for measurement, image edge extraction, and 3D topography reconstruction. After the 3D topography of the measured surface has been reconstructed, the topography field description parameters are calculated. A standard roughness block was used for calibration of the surface microtopography measuring system. Results obtained showed the measurement method output has good agreement with the actual asperity (unevenness or roughness) of the surface. The computer subsystem is used to process and control asperity measurements and image generation, and for image acquisition and presentation.

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“…Laser coating-texturing was used to machine the micro dimples [9]. The surface structures were fabricated on the roll in CO2 laser beam modulation with a rotating polygon [10]. The focused UV laser beam was also applied to surface structuring on the hard TiCN coatings [4].…”

Section: Introductionmentioning

confidence: 99%

Surface Texturing in Cutting with Micro-Scale Structured Tools

Uchiyama

Uchiyama²,

Kusumoto

et al. 2022

DDF

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Functional surfaces have been widely used for control of physical and/or chemical properties of substances on the surface. In the manufacturing industries, some of micro fabrication approaches such as laser processing have been applied to form textured surfaces, which control the surface functions with topographies. This study presents the surface texturing in cutting with micro-scale structured end mills. Micro-scale nicks are fabricated on the cutting edges of PCD (Poly-Crystalline Diamond) end mills in laser finishing. The cutting operation is conducted to form the chips on each nick with the cutter axis inclination in the feed direction. An analytical model is applied to control the surface structure for the spindle speed, the feed rate, the nick geometry and the inclination angle of the cutter axis. Then, the surface structures were fabricated in the actual cutting process. The machining operation in this study is available in fabrication of the micro-scale structures at high production rates and the structures shape can be controlled in the surface simulation.

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Investigation of CO2 laser beam modulation by rotating polygon

Cited by 16 publications

References 10 publications

A Review of Surface Texturing in Internal Combustion Engine Piston Assembly

A Review of Surface Texturing in Internal Combustion Engine Piston Assembly

Three-dimensional measuring technique for surface topography using a light-sectioning microscope

Surface Texturing in Cutting with Micro-Scale Structured Tools

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