Surface quality, microstructure, mechanical properties and tribological results of the SKD 61 tool steel with prior heat treatment affected by the deposited energy of continuous wave laser micro-polishing

Chang, Chang Shuo; Chung, Chen-Kuei; Lin, Jen Fin

doi:10.1016/j.jmatprotec.2016.03.024

Cited by 15 publications

(8 citation statements)

References 27 publications

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“…The CNC programs were prepared manually, and the offsets of the path were not taken into consideration. The parameters of the EDM machines were chosen following the recommendations of the manual [103, 104, 105, 106, 107, 108, 109]. The parameters for the first group of experiments are presented in Table 3.…”

Section: Methodsmentioning

confidence: 99%

Electrical discharge machining of ceramic nanocomposites: sublimation phenomena and adaptive control

Grigoriev

Kozochkin

Porvatov

et al. 2019

Heliyon

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The productivity of electrical discharge machining (EDM) is relatively low owing to the natural laws of electrical erosion. Precise EDM demands uninterrupted control of the discharge gap and adjustment of process parameters. It is particularly critical for processing large workpieces with complex linear surfaces and for materials with threshold conductivities such as the new advanced ceramic nanocomposites Al2O3+TiC and Al2O3+SiCw+TiC(30–40%). In these cases, adequate flushing of erosion products is hampered by the geometry of the working space or by the small value of the required discharge gap, which does not exceed 2.2–2.5 μm. The methods of adaptive control in modern computer numerical control systems of EDM equipment based on measuring the electrical parameters in the working zone have been shown to be ineffective in the cases described above. This study aims to investigate the natural phenomena of material sublimation under discharge pulses for conductive ceramics and nanocomposites. The measured conductivities of the samples are higher than the percolation threshold. However, the question of machinability remains open owing to detected processing interruptions and poor quality of machined surfaces. New knowledge on EDM of conductive ceramics and nanocomposites can improve the final quality of the machined surfaces and productivity of the method by the introduction of advanced monitoring and control methods based on acoustic emissions. The manuscript presents an up-to-date overview and current state of the research on the subject area. The obtained morphology of the samples and discussion of the findings complete the experimental part of the study. The scientific basis for a new type of adaptive control system is provided. This can improve the effectiveness of parameter control for machining conductive ceramics and nanocomposites and contribute to an increase in the EDM performance for the most critical cases.

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Section: Methodsmentioning

confidence: 99%

Electrical discharge machining of ceramic nanocomposites: sublimation phenomena and adaptive control

Grigoriev

Kozochkin

Porvatov

et al. 2019

Heliyon

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“…It is shown experimentally that varying FOD gives better control over the surface smoothness [50]. As a follow up, Chang et al [51] have given a much clearer idea about the effect of FOD on surface quality of steel components. As per his spatial frequency analysis, it is found that a drop in FOD decreases the highest peaks on the steel surface.…”

Section: Focal Offset Distancementioning

confidence: 93%

“…The need for polishing has been rocketed in the past ten years due to the increasing needs for the fast-developing society as shown in Table 3 [8,31,51,[62][63][64][65][66]. There is a magical rise in the need for highly precise components in each and every sector including medical and industrial.…”

Section: Advantages Of Laser Polishingmentioning

confidence: 99%

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Review on mechanism and process of surface polishing using lasers

2019

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Laser polishing is a technology of smoothening the surface of various materials with highly intense laser beams. When these beams impact on the material surface to be polished, the surface starts to be melted due to the high temperature. The melted material is then relocated from the ‘peaks to valleys’ under the multidirectional action of surface tension. By varying the process parameters such as beam intensity, energy density, spot diameter, and feed rate, different rates of surface roughness can be achieved. High precision polishing of surfaces can be done using laser process. Currently, laser polishing has extended its applications from photonics to molds as well as bio-medical sectors. Conventional polishing techniques have many drawbacks such as less capability of polishing freeform surfaces, environmental pollution, long processing time, and health hazards for the operators. Laser polishing on the other hand eliminates all the mentioned drawbacks and comes as a promising technology that can be relied for smoothening of initial topography of the surfaces irrespective of the complexity of the surface. Majority of the researchers performed laser polishing on materials such as steel, titanium, and its alloys because of its low cost and reliability. This article gives a detailed overview of the laser polishing mechanism by explaining various process parameters briefly to get a better understanding about the entire polishing process. The advantages and applications are also explained clearly to have a good knowledge about the importance of laser polishing in the future.

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“…Its efficiency is eight times bigger than that of the traditional polishing and 30 times bigger than that of the manual polishing of skilled workers under the same prerequisite [4][5][6]. As the heat is accumulated on the metallic surface to a certain amount a micro peak on the material surface will first reach the melting point and start melting, and the melted material flows from the peak to the valley due to the tension [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Verification of Laser-Polishing Free Surface of S136D Die Steel

Zhou

Zhao

et al. 2021

Metals

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As a novel polishing technology, polishing by laser beam radiation can be used to improve the sample surface finish without causing material losses. In order to study the effect of laser polishing on the surface morphology of S136D die steel, an L16(44) orthogonal experiment was designed to describe the variation trend of surface roughness with energy density. The two-dimensional transient model of laser polishing was established to simulate the evolution process of material surface morphology during laser polishing by combining numerical simulation with the experiment. The model uses a moving laser heat source to study the effects of capillary pressure and thermocapillary pressure in the laser polishing process. The experimental results show that the minimum roughness can be reduced to 0.764 μm, and the error between the actual molten pool depth and the simulated molten pool depth is 5.3%.

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Surface quality, microstructure, mechanical properties and tribological results of the SKD 61 tool steel with prior heat treatment affected by the deposited energy of continuous wave laser micro-polishing

Cited by 15 publications

References 27 publications

Electrical discharge machining of ceramic nanocomposites: sublimation phenomena and adaptive control

Electrical discharge machining of ceramic nanocomposites: sublimation phenomena and adaptive control

Review on mechanism and process of surface polishing using lasers

Numerical Simulation and Verification of Laser-Polishing Free Surface of S136D Die Steel

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