Evaluation of DPI Change Impact on Laser Machined Surface Quality

2014 ◽  
Vol 474 ◽  
pp. 369-374
Author(s):  
Jana Knedlova ◽  
Libuše Sýkorová ◽  
Vladimír Pata ◽  
Martina Malachová
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Laser Micromachining ◽  
Technological Parameters ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
Machined Surface Roughness ◽  
Change Impact

The article focuses on the field of PMMA laser micromachining at change of the technological parameters. The aim was to evaluate machined surface roughness at different setting of DPI definition (number of dots paths on square inch). Commercial CO2laser Mercury L-30 by firm LaserPro, USA was used for experimental machining. Ray of laser could be focused on mark diameter d=185 mm.

Application of Theory of Hypothesis Testing in Process of Laser Micromachining

2014 ◽  
Vol 693 ◽  
pp. 247-255 ◽  
Author(s):  
Vladimír Pata ◽  
Libuše Sýkorová ◽  
Jana Knedlova ◽  
Martin Řezníček
Keyword(s):  
Surface Roughness ◽  
Hypothesis Testing ◽  
Laser Micromachining ◽  
Technological Parameters ◽  
Machined Surface ◽  
Final Surface ◽  
Machined Surface Roughness

The article focuses on the field of PMMA laser micromachining at change of the technological parameters. The aim was to evaluate machined surface roughness at different setting of DPI definition (number of dots – paths on square inch). The aim is application of the Theory of Hypothesis testing for evaluation changing of final surface during imputing variable technological parameters.

scholarly journals Surface Roughness Analysis of H13 Steel during Electrical Discharge Machining Process Using Cu–TiC Sintered Electrode

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5943
Author(s):  
Arminder Singh Walia ◽  
Vineet Srivastava ◽  
Mayank Garg ◽  
Nalin Somani ◽  
Nitin Kumar Gupta ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Electrical Discharge ◽  
Pulse Current ◽  
Electrical Discharge Machining ◽  
Machining Process ◽  
H13 Steel ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
Semi Empirical

In electrical discharge machining (EDM), the machined surface quality can be affected by the excessive temperature generation during the machining process. To achieve a longer life of the finished part, the machined surface quality plays a key role in maintaining its overall integrity. Surface roughness is an important quality evaluation of a material’s surface that has considerable influence on mechanical performance of the material. Herein, a sintered cermet tooltip with 75% copper and 25% titanium carbide was used as tool electrode for processing H13 steel. The experiments have been performed to investigate the effects of EDM parameters on the machined surface roughness. The findings show that, as the pulse current, pulse length, and pulse interval are increased, the surface roughness tends to rise. The most significant determinant for surface roughness was found to be pulse current. A semi-empirical surface roughness model was created using the characteristics of the EDM technique. Buckingham’s theorem was used to develop a semi-empirical surface roughness prediction model. The semi-empirical model’s predictions were in good agreement with the experimental studies, and the built empirical model based on physical features of the cermet tooltip was tested using dimensional analysis.

scholarly journals Experimental Optimization of Annular Polishing Parameters for Silicon Carbide

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Yuan Liu ◽  
La Han ◽  
Haiying Liu ◽  
Yikai Shi ◽  
Junjie Zhang
Keyword(s):  
Surface Roughness ◽  
Silicon Carbide ◽  
Surface Quality ◽  
Material Removal ◽  
Polished Surface ◽  
Strong Impact ◽  
Machined Surface ◽  
Experimental Optimization ◽  
Machined Surface Quality ◽  
Influential Parameters

Machined surface quality has a strong impact on the functionality of silicon carbide-based components and devices. In the present work, we first analytically investigate the complex coupling of motions in annular polishing based on the Preston equation, which derives the influential parameters for material removal. Subsequently, we conduct systematic annular polishing experiments of reaction-bonded silicon carbide to investigate the influence of derived parameters on polished surface quality, which yield optimized polishing parameters for achieving ultralow surface roughness of reaction-bonded silicon carbide.

Influence of Fiber Orientation on Machined Surface Quality in Milling of Unidirectional CFRP Laminates

2016 ◽  
Vol 1136 ◽  
pp. 137-142 ◽  
Author(s):  
Chang Ying Wang ◽  
Liang Wen ◽  
Cheng Dong Wang ◽  
Hong Zhou Zhang ◽  
Qing Long An ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Morphology ◽  
Surface Quality ◽  
Fiber Orientation ◽  
Orientation Angle ◽  
Machined Surface ◽  
Cfrp Laminates ◽  
Pull Out ◽  
Machined Surface Quality ◽  
Fiber Orientation Angle

Machined surface quality is the deciding factor when evaluating the machinability of CFRP. This present work concerns the influence of fiber orientation on the machined surface quality of the machined surface in terms of surface morphology and surface roughness during milling of unidirectional T800/X850 CFRP laminates. Four group milling tests are conducted under the fiber orientation angle of 0°, 45°, 90° and 135°, respectively. For the fiber orientation angle of 0°, the machined defects are mainly fiber pull-out and fiber brittle fracture owing to interfacial debonding between the fibers and matrix resin. For the fiber orientation angle of 45°, the machined defects are mainly resin cavities and the surface morphology is rough and presents wavy fractures. For the fiber orientation angle of 90°, smooth or neat surface is observed except for the surface as the cutting tool cutting in the workpiece on which severe cracks are observed. For the fiber orientation angle of 135°, the surface is smooth with less fibers pull-out. Evaluation profile and surface roughness of the machined surfaces were measured as well. Dramatically fluctuate of the evaluation profile is observed for the fiber orientation angle of 45° with a high surface roughness Ra. Verification tests were also conducted on the multidirectional CFRP (cross-ply) laminates. It is indicated that the presence of the fiber orientation angle of 45° is the main factor leading to the decline of the machined surface quality.

Study on Surface Roughness Simulation to Lathe Machining

2012 ◽  
Vol 538-541 ◽  
pp. 1373-1376
Author(s):  
Dong Xie ◽  
Min Wang
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Tool Material ◽  
Cutting Parameters ◽  
Simulation System ◽  
Cnc Machining ◽  
Machined Surface ◽  
Cutting Surface ◽  
Machined Surface Quality ◽  
The Mathematical Model

This paper presents a simulation system for the cutting surface roughness based on the feed rate, spindle speed and tool material, shape and other parameters. The reasons affecting the surface quality in machining is explained. Using classic formula and empirical data, the mathematical model of the surface roughness is built to predict surface quality of parts. The paper proposes a method of the simulation system design for the machined surface quality. The simulation results could give a guide to the choice of cutting parameters in CNC machining.

Study on Surface Roughness in High-Speed Milling for ALMn1Cu

2012 ◽  
Vol 157-158 ◽  
pp. 636-640 ◽  
Author(s):  
Zhen Hua Wang ◽  
Jun Tang Yuan ◽  
Jun Huang
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Analysis Of Variance ◽  
High Speed ◽  
Cutting Parameters ◽  
Factorial Experiments ◽  
Machined Surface ◽  
High Speed Milling ◽  
Machined Surface Quality ◽  
Cutting Experiments

Anti-rust aluminum is widely used in aviation, aerospace, communications, as well as weapons with non-corrosion, light, and other fine characteristic. In this study, in order to improve the machined surface quality and reduce the surface roughness and find the influence of the cutting parameters on the surface roughness, a series of cutting experiments for AlMn1Cu are conducted to obtain surface roughness values in high-speed milling. According to the analysis of variance (ANOVA) of factorial experiments, the cutting parameters significantly influencing on the surface roughness were presented.

scholarly journals Experimental Research on the Surface Quality of Milling Contour Bevel Gears

2021 ◽  
Author(s):  
Mingyang Wu ◽  
Jianyu Zhang ◽  
Chunjie Ma ◽  
Yali Zhang ◽  
Yaonan Cheng
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Surface Defects ◽  
Low Noise ◽  
Tooth Surface ◽  
Machining Accuracy ◽  
Machined Surface ◽  
Bevel Gears ◽  
Machined Surface Roughness

Abstract Contour bevel gears have the advantages of high coincidence, low noise and large bearing capacity, which are widely used in automobile manufacturing, shipbuilding and construction machinery. However, the quality of the tooth surface has a significant impact on the transmission accuracy of the gear, so it is of great significance to optimize the surface quality of the contour bevel gear. This paper firstly analyzes the formation process of machined surface roughness of contour bevel gears on the basis of generating machining method, and dry milling experiments of contour bevel gears are conducted to analyze the effects of cutting speed and feed rate on the machined surface roughness and surface topography of the workpiece. Then, the surface defects on the machined surface of the workpiece are studied by SEM, and the causes of the surface defects are analyzed by EDS. After that, XRD is used to compare the microscopic grains of the machined surface and the substrate material for diffraction peak analysis, and the effect of cutting parameters on the microhardness of the workpiece machined surface is investigated by work hardening experiment. The research results are of great significant for improving the machining accuracy of contour bevel gears, reducing friction losses and improving transmission efficiency.

scholarly journals Molecular Dynamics Investigation of Residual Stress and Surface Roughness of Cerium under Diamond Cutting

Micromachines ◽  
2018 ◽  
Vol 9 (8) ◽  
pp. 386 ◽  
Author(s):  
Yao Li ◽  
Maobing Shuai ◽  
Junjie Zhang ◽  
Haibing Zheng ◽  
Tao Sun ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Residual Stress ◽  
Surface Roughness ◽  
Surface Quality ◽  
Depth Of Cut ◽  
Formation Mechanisms ◽  
Machining Parameters ◽  
Diamond Cutting ◽  
Machined Surface ◽  
Machined Surface Quality

Machined surface quality in terms of residual stress and surface roughness has an important influence on the performance of devices and components. In the present work, we elucidate the formation mechanisms of residual stress and surface roughness of single crystalline cerium under ultraprecision diamond cutting by means of molecular dynamics simulations. Influences of machining parameters, such as the rake angle of a cutting tool, depth of cut, and crystal orientation of the workpiece on the machined surface quality were also investigated. Simulation results revealed that dislocation activity and lattice distortion are the two parallel factors that govern the formation of both residual stress and surface roughness. It was found that both distributions of residual stress and surface roughness of machined surface are significantly affected by machining parameters. The optimum machining parameters for achieving high machined surface quality of cerium by diamond cutting are revealed.

Machined Surface Quality of Pre-Sintered Hardenable PM Steel

2015 ◽  
Vol 659 ◽  
pp. 335-339 ◽  
Author(s):  
Thawatchai Khantisitthiporn ◽  
Monnapas Morakotjinda ◽  
Bhanu Vetayanugul ◽  
Ruangdaj Tongsri
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Surface Texture ◽  
Depth Of Cut ◽  
Hydraulic Pressure ◽  
Average Surface Roughness ◽  
Machined Surface ◽  
Average Surface ◽  
Machined Surface Quality

The benefit of pre-sintered machining is to avoid machining difficulty of sintered parts especially hardenable PM steels. Pre-sintering treatments of green PM part at temperatures lower than the normal sintering temperature of 1120 °C result in green strength improvement high enough for machining. In this study, the influences of various pre-sintering temperatures and several machining conditions on machined surface quality of pre-sintered PM samples were investigated. The pre-sintered samples were machined by a turning process using a carbide cutting insert with varied cutting speeds at a fixed feed rate and depth of cut without cutting lubricant. Chromium alloyed PM steel (Astaloy® CrM) powder samples with (0.5 wt. %C) and without graphite (0 wt. % C) additions mixed with 1 wt. % of zinc stearate were prepared as green parts by cold compaction in a cylindrical die with diameter of 30 mm. Green density was about 7.00 g/cm3 and height of each sample was controlled by hydraulic pressure and powder weight of 80 g/sample. The green samples were treated by pre-sintering treatment before machining testing. Surface quality of each machined sample was evaluated by average surface roughness and surface texture by SEM analysis and the appearance of outlet edge breakout. The experimental results revealed that the pre-sintered samples with graphite addition showed better surface quality in terms of surface roughness and surface texture and small outlet edge breakout appearance. Moreover, at high pre-sintering temperatures of 900 and 1,000°C, the samples showed similar average surface roughness under the same turning conditions. The obtained surface textures were better than those of the samples pre-sintered at 700 and 800°C. The outlet edge breakout could not be found in the graphite-added samples pre-sintering at 1,000°C.

scholarly journals Evaluation of surface roughness after milling with a tool with modified vibration damper

Mechanik ◽  
2018 ◽  
Vol 91 (8-9) ◽  
pp. 720-723
Author(s):  
Piotr Löschner ◽  
Piotr Niesłony ◽  
Roman Chudy ◽  
Paweł Biłous ◽  
Marek Lipowczyk
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Experimental Research ◽  
Roughness Parameters ◽  
Vibration Damper ◽  
Machined Surface ◽  
Research Results ◽  
Surface Roughness Parameters ◽  
Machined Surface Quality ◽  
Positive Effect

This article presents the research results regarding chosen surface roughness parameters after milling with a standard holder and a holder equipped with a special modified vibration damper. The experimental research was conducted on a novel research stand. Obtained results have confirmed a positive effect of the modified vibration damper on machined surface quality.

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