Effect of Abrasive Waterjet Parameters on Volume Removal Trends in Turning

1995 ◽  
Vol 117 (4) ◽  
pp. 475-484 ◽  
Author(s):  
A. I. Ansari ◽  
M. Hashish
Keyword(s):  
Experimental Investigation ◽  
Particle Size ◽  
Flow Rate ◽  
Removal Rate ◽  
Abrasive Particle ◽  
Sweep Rate ◽  
Abrasive Waterjet ◽  
Orifice Diameter ◽  
Abrasive Waterjets ◽  
Rate Limit

An experimental investigation was conducted to investigate the influence of abrasive waterjet parameters on the volume removal rate in abrasive waterjet turning. Abrasive mass flow rate, abrasive particle size, waterjet pressure, and orifice diameter were the principal variables that were investigated. Limited tests were also conducted with abrasive mixtures. The results show that the volume removal trends in abrasive waterjet turning are similar to those in linear cutting with abrasive waterjets. Increasing waterjet pressure, orifice diameter, and abrasive flow rate generally resulted in an increase in volume removal rate. However, the volume removal rate levels off either due to volume sweep rate limit or due to the abrasive waterjet limit. The results also suggest a potential for optimizing the abrasive flow rate and abrasive composition. The volume removal rate showed only a weak dependence on the abrasive particle size.

scholarly journals Hydrodynamic Cavitation-Assisted Synthesis of Nanocalcite

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Shirish H. Sonawane ◽  
Sarang P. Gumfekar ◽  
Kunal H. Kate ◽  
Satish P. Meshram ◽  
Kshitij J. Kunte ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Particle Size ◽  
Systematic Study ◽  
Energy Efficient ◽  
Reaction Rate ◽  
Hydrodynamic Cavitation ◽  
Orifice Diameter ◽  
Particle Size Reduction ◽  
Carbonation Process ◽  
Reactor Geometry

A systematic study was made on the synthesis of nanocalcite using a hydrodynamic cavitation reactor. The effects of various parameters such as diameter and geometry of orifice,CO2flow rate, andCa(OH)2concentration were investigated. It was observed that the orifice diameter and its geometry had significant effect on the carbonation process. The reaction rate was significantly faster than that observed in a conventional carbonation process. The particle size was significantly affected by the reactor geometry. The results showed that an orifice with 5 holes of 1 mm size resulted in the particle size reduction to 37 nm. The experimental investigation reveals that hydrodynamic cavitation may be more energy efficient.

Effect of Abrasive Particle Size on Lapping of Sapphire Wafer by Fixed Abrasive Pad

2018 ◽  
Vol 764 ◽  
pp. 106-114
Author(s):  
Jian Bin Wang ◽  
Zhen Li ◽  
Yong Wei Zhu ◽  
Ben Chi Jiang ◽  
Pei Cheng Shi
Keyword(s):  
Particle Size ◽  
Penetration Depth ◽  
Material Removal ◽  
Removal Rate ◽  
Abrasive Particle ◽  
Work Piece ◽  
Average Surface Roughness ◽  
Sapphire Wafer ◽  
Fixed Abrasive Pad ◽  
Fixed Abrasive

The choice of abrasive particle size is crucial to improve the lapping efficiency and surface quality in lapping of sapphire wafer by fixed abrasive (FA) pad. A model for the penetration depth of a single abrasive is developed with fixed abrasive pad. A serious of lapping tests were carried out using FA pads embedded with different size of diamond particles to verify the validity of the developed model. Results show that the penetration depth of abrasive is related not only to the particle size, but to the hardness ratio of the work-piece to the pad as well. The material removal rate of sapphire is proportional to the square of abrasive particle size, while the average surface roughness is proportional to the abrasive particle size.

Experimental Investigation of Abrasive Waterjet Machining of Titanium Graphite Laminates

2016 ◽  
Vol 10 (3) ◽  
pp. 392-400 ◽  
Author(s):  
M. Ramulu ◽  
◽  
Vara Isvilanonda ◽  
Rishi Pahuja ◽  
Mohamed Hashish ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Titanium Alloy ◽  
High Temperature ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Machining Process ◽  
Abrasive Waterjet ◽  
Material System ◽  
Operating Variables

High temperature Fiber Metal Laminate – Titanium/Graphite (Ti/Gr) is an advanced material system, developed to meet the high temperature requirements in aerospace applications. High specific strength and stiffness of composite core along with its protection from aggressive environment by tough titanium alloy sheets qualify FMLs for a promising alternative material where metallic and composites overcome each other's limitations. However, industrial employability of this three phase system is often limited by the machining challenges posed by the difference in material removal mechanisms of Titanium alloy, PIXA thermoplastic polyimide resin and graphite fibers. An experimental investigation was conducted to evaluate the machinability of 1 mm thick Ti/Gr laminate sheets through Abrasive Waterjet (AWJ) machining process in terms of kerf characteristics and material removal rate. The parametric influence of AWJ operating variables on machining performance was studied by systematically measuring operating variables (traverse speed and Abrasive flow rate) using fully crossed Design of experiment (DOE) scheme, and statistically analyzing using ANOVA (Analysis of variance) technique. Empirical models were developed to quantify these effects and predict the influence of process parameters on material removal rate, kerf taper, entry damage width and overcut in straight cutting of Ti/Gr sheets.

Low Defect Ceria for ILD CMP

2007 ◽  
Vol 991 ◽  
Author(s):  
Jai Kasthurirangan ◽  
John Parker ◽  
Tiffany Bettis ◽  
Charles Dowell
Keyword(s):  
Particle Size ◽  
Removal Rate ◽  
Abrasive Particle ◽  
Commercial Development ◽  
Particle Properties ◽  
Particle Characteristics ◽  
Particle Population ◽  
Surface Balance ◽  
Simple Surface ◽  
Inverse Proportionality

ABSTRACTThe reduction of wafer scratching is a key goal driving the commercial development of CMP slurries. To better understand the underlying abrasive particle properties critical to the scratch performance of ILD CMP slurries, the scratching behavior of ceria slurries prepared with a range of particle size characteristics are characterized. Scratch results are presented and two effects are proposed to account for the findings. The Removal Rate Effect relies solely on the observed inverse proportionality between scratching and removal rate. This interpretation is consistent with a simple surface balance of scratches but suggests that removal rate differences dominate scratch performance. The Managed Tail Effect considers the effect of particle characteristics on both the creation and the removal of scratches. For a given particle population, the larger particles are assumed to dominate scratch creation. However, larger particles are also seen to drive removal rate which affects the removal of scratches during polishing. This interpretation implies that optimal scratch performance for a ceria ILD CMP slurry will be obtained when the width of the ceria particle's size distribution is optimized relative to its mean.

Preparation and Processing Performance of Viscoelastic Abrasive Flow

2013 ◽  
Vol 546 ◽  
pp. 55-59
Author(s):  
Lu Yang ◽  
Ke Hua Zhang ◽  
Guang Zhen Zheng ◽  
Hang Guo
Keyword(s):  
Surface Roughness ◽  
Silicon Carbide ◽  
Particle Size ◽  
Silicone Oil ◽  
Removal Rate ◽  
Abrasive Particle ◽  
Viscosity Coefficient ◽  
Advanced Technology ◽  
Dielectric Characteristics ◽  
Workpiece Surface

Abstract. Abrasive flow machining (AFM) is an advanced technology which can improve the uniform consistency of profiled surface. First, the dielectric characteristics of the abrasive flow (the medium features include medium types, medium viscosity coefficient, the concentration of medium and abrasive, abrasive type, abrasive size) is studied, abrasive flow including different medium is deployed by mixing and mix well of the polymer silicone fluid, silicone oil, wax, and other fats, and adding silicon carbide with different particle size and mixed for processing experiment. Within the limits of the workpiece polishing, the change direction of the surface roughness and the removal rate of workpiece surface are substantially same and approaching the linear relationship, the lowest surface roughness Ra of SiC (abrasive particle size is 200#) reduced from 3.5μm to 0.5μm. The hardness and durability of the silicon carbide abrasive in this study is quite good, and the price is low, the processing characteristics are quite consistent with the economic costs on the demand.

Effects of Nano-scale Colloidal Abrasive Particle Size on SiO2 by Chemical Mechanical Polishing

2001 ◽  
Vol 671 ◽  
Author(s):  
Chunhong Zhou ◽  
Lei Shan ◽  
S.H. Ng ◽  
Robert Hight ◽  
Andrew. J. Paszkowski ◽  
...  
Keyword(s):  
Particle Size ◽  
Material Removal Rate ◽  
Surface Finish ◽  
Material Removal ◽  
Removal Rate ◽  
Abrasive Particle ◽  
Single Crystal Silicon ◽  
Weight Percent ◽  
Crystal Silicon ◽  
P Type

ABSTRACTThis paper reports on the effect of colloidal abrasive particle size in the polishing of thermally grown silicon dioxide on 100mm diameter, P-type, (100), single crystal silicon wafers. The abrasive particle sizes were varied in six (6) slurries with pH values of 10.97 ± 0.08. The abrasive sizes were 10, 20, 50, 80, 110 and 140nm in diameter, and the slurry contained 30 weight percent abrasives. The experimental results indicate that the material removal rate (MRR) varies with the volume of the particle size. Results also confirm that there exists an optimum abrasive particle size with respect to material removal rate and surface finish. For a pad surface roughness of 5.2μm (Ra), the slurry containing 80nm particles resulted in the highest material removal rate and best surface finish. A nano-film model based on the pad roughness is used to explain the results.

Micro Ultrasonic Machining Using Oil Based Abrasive Slurry

2008 ◽  
Author(s):  
Murali M. Sundaram ◽  
Sreenidhi Cherku ◽  
K. P. Rajurkar
Keyword(s):  
Particle Size ◽  
Material Removal Rate ◽  
Surface Finish ◽  
Material Removal ◽  
Removal Rate ◽  
Abrasive Particle ◽  
High Wear Resistance ◽  
Ultrasonic Machining ◽  
Influence Of Process Parameters ◽  
Slurry Concentration

Advanced engineering materials posses excellent properties such as high wear resistance, and inertness to corrosion and chemical reactions. Since these materials are usually hard, brittle, chemically inert, and electrically nonconductive, they pose serious machinability challenges. Micro ultrasonic machining (Micro USM) is an emerging method for the micromachining of hard and brittle materials without any thermal damage. This paper presents the results of micro ultrasonic machining using oil based abrasive slurry. Details of the in-house built experimental setup used to conduct the experiments are explained. The influence of process parameters such as slurry medium, slurry concentration, and abrasive particle size on the performance of micro USM are reported. It was noticed that the evidence of three body material removal mechanism is predominant for micro USM using oil based slurry. In general, the material removal rate increases with the increase in the abrasive particle size for both aqueous abrasive slurry and oil based abrasive slurry. Further, material removal rate is consistently higher for experiments conducted with aqueous abrasive slurry medium. On the other hand, it is noticed that the oil based slurry medium provides better surface finish. It is also noticed that the smaller abrasive grains provide better surface finish for both aqueous, and oil based abrasive slurry mediums. Role of slurry concentration is ambiguous, as no clear trend of its effect of on process performance is evident in the available experimental results.

scholarly journals Investigation of the Effects of Machining Parameters on Material Removal Rate in Abrasive Waterjet Turning

2014 ◽  
Vol 6 ◽  
pp. 624203 ◽  
Author(s):  
Iman Zohourkari ◽  
Mehdi Zohoor ◽  
Massimiliano Annoni
Keyword(s):  
Flow Rate ◽  
Material Removal Rate ◽  
Rotational Speed ◽  
Material Removal ◽  
Removal Rate ◽  
Traverse Speed ◽  
Abrasive Waterjet ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Cutting Head

The effects of the main operational machining parameters on the material removal rate (MRR) in abrasive waterjet turning (AWJT) are presented in this paper using a statistical approach. The five most common machining parameters such as water pressure, abrasive mass flow rate, cutting head traverse speed, workpiece rotational speed, and depth of cut have been put into a five-level central composite rotatable experimental design (CCRD). The main effects of parameters and the interaction among them were analyzed by means of the analysis of variance (ANOVA) and the response surfaces for MRR were obtained fitting a second-order polynomial function. It has been found that depth of cut and cutting head traverse speed are the most influential parameters, whereas the rotational speed is insignificant. In addition, the investigations show that interactions between traverse speed and pressure, abrasive mass flow rate and depth of cut, and pressure and depth of cut are significant on MRR. This result advances the AWJT state of the art. A complete model discussion has been reported drawing interesting considerations on the AWJT process characterising phenomena, where parameters interactions play a fundamental role.

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