Abrasive Water Jet Machining – The Review
Abrasive water jet machining (AWJM) is a relatively new machining technique. Abrasive Water Jet Machining is extensively used in many industrial applications. AWJM is a nonconventional machining process where material is removed by impact erosion of high pressure high velocity of water and entrained high velocity of grit abrasives on a work piece. There are so many process parameter affect quality of machined surface cut by AWJM. Important process parameters which mainly affect the quality of cutting are traverse speed, hydraulic pressure, stand of distance, abrasive flow rate and types of abrasive. Important quality parameters in AWJM are Material Removal Rate (MRR), Surface Roughness (SR), kerf width, tapering of kerf. This paper reviews the research work carried out so far in the area AWJM.
Numerical optimization for cutting process in glass fiber reinforced plastic using conventional and non-conventional methods
Doctor of Philosophy in Mechanical Engineering. Thesis (Ph.D.)--Eastern Mediterranean University, Faculty of Engineering, Dept. of Mechanical Engineering, 2013. Supervisor: Prof. Dr. Majid Hashemipour.
Abrasive Waterjet Machining of Polymer Matrix Composites – Cutting Performance, Erosive Process and Predictive Models
An investigation of the cutting performance and erosive process in abrasive waterjet (AWJ) machining of polymer matrix composites is presented. It shows that AWJ cutting can produce good quality kerf at high production rates if the cutting parameters are properly selected. Plausible trends of the cutting performance are discussed, as assessed by the various kerf geometry and quality measures, with respect to process parameters. The traverse speed, water pressure and abrasive flowrate are found to have a profound effect on the total depth of cut and kerf taper angle, while the first two variables also have a large effect on the kerf width. The study shows that the optimum jet forward impact angle in the cutting plane is about 80° which increases the total depth of cut only marginally, and has little effect on the other kerf characteristics. It is found that good quality kerf without delamination can be achieved if through cut is attained. A scanning electron microscopy (SEM) analysis of the cut surfaces reveals that the erosive process for the matrix material (resin) involves shearing and ploughing as well as intergranular cracking. Shearing or cutting is found to be the dominant process for cutting the fibres in the upper cutting region, but the fibres are mostly pulled out in the lower region. Mathematical models for the total depth of cut are finally developed and verified, together with empirical models for the other kerf geometrical features.