International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 Advance Manufacturing Processes Review Part II: Water Jet Machining (WJM) Swapnil Umredkar1, Vallabh Bhoyar2 1,2UG Student, Mechanical Engineering Department, G. H. Raisoni College of Engineering, Maharashtra, India -------------------------------------------------------------------------***------------------------------------------------------------------------ Abstract – Water jet has been in existence and practised cutting tool material. For such conditions, inspite of for over twenty years, but it is yet to reach its full potential recent developments, traditional methods of machining in the construction and manufacturing industry. The are uneconomical, time consuming and degree of paper presents aspects regarding an innovative accuracy and surface finish and poor. The newer nonconventional technology. Many research works have machine processes, so developed are often called been done in the field of Water Jet Machining; however, ‘Modern Machining Methods’ or non–traditional these is always a scope for research in any particular field. machining processes or unconventional machining Many research works have been put forward on the basis processes. These are unconventional in the sense that of changing the process parameter also many have been conventional tool is not utilize for cutting the material. It put forward by the use of optimization techniques, etc employs some form energy like mechanical, chemical, thermal, electro-chemical etc. for cutting the material. Keywords — water jet, abrasive, nonconventional, Also, the absence of tool workpiece contact or relative technological, construction, innovative, industry motion, makes the processes a non-traditional one. 1. INTRODUCTION 1.1Definition of non-traditional machining process Machining process removes certain parts of the work It is defined as a group of processes that removes excess piece to change them to final product. The traditional material by various techniques involving mechanical, processes of machining are turning, milling, drilling, thermal, electrical or chemical energy or combination of grinding, broaching, etc. Traditional, also termed as these energies without use of sharp cutting tools which conventional, machining requires the presence of a tool are required in traditional machining processes. that is harder than the work piece to be machined. This tool should be penetrate in the work piece to be certain 1.2Advantages of non-traditional machining over depth. Moreover, a relative motion between the tool and conventional machining processes workpiece is responsible for forming or generating the required shape. The end of second world war brought a 1. Applicable to all materials: these methods are new revolution in the engineering industry. Many new not affected by hardness, toughness and brittleness of materials were developed to fulfil the need of aircraft work materials. industry, missile technology, space research equipment 2. Intricate shape machining: it can produce and nuclear industry. These materials like carbide, complex-intricate shape on any workpiece material. tungsten, ceramics, tantalum, beryllium, uranium, nitro- 3. Extreme hard material machining: hard to alloy etc. Are extremely hard and sometimes machine materials like tungsten, uranium, tantalum can unmachinable by traditional machining processes. The be machined. traditional process is not suitable for the machining in 4. No mechanical contact: material is removed following cases: without mechanical contact with the workpiece and tool. 5. Easy compatible: it can be combined with CNC 1. Workpiece materials of greater hardness and minicomputer controls for automation. 2. New materials with high strength, heat resistance 6. High accuracy: high accuracy to close tolerance such as titanium alloys, mnemonic alloys, etc. is easily obtained in these methods. 3. Complex and intricate shapes with high accuracy. 7. 1.3Classification of non-traditional machining Also, these materials mentioned above, possess high processes strength to weight ratio, hardness and heat resisting qualities making it sometimes impossible for machining. 1. Type of energy used to shape materials. When conventional methods are tried, it is difficult, time 2. The basic mechanism of material removal. consuming and economical to machine the workpiece 3. The source of energy for material removal. material. This adds to the fact that during conventional 4. Medium of transfer of these energies. machining processes an increase in hardness of workpiece material results in decrease in economic cutting speed. This needed the development of improved © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 2028 International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 1.4Machining processes WJM is suitable for cutting plastics, foods, rubber insulation, automotive carpeting and headliners, and 1. Mechanical Processes most textiles. a) Abrasive Jet Machining (AJM) b) Ultrasonic Machining (USM) 2. LITERATURE REVIEW: c) Water Jet Machining (WJM) d) Abrasive Machining (AWJM) Abhishek Dixit, Vikas Dave, M.R. Baid reviewed the water 2. Chemical Processes: jet machining it states that use of water jet has been in a) Chemical Milling (CHM) existence for over twenty years, but it is yet to reach its b) Photochemical Milling (PCM) full potential in the construction industry. This study 3. Electrochemical Processes: examines the role of water jet in heavy construction in a) Electrochemical Machining (ECM) general and particularly how it affects the regional b) Electrochemical Grinding (ECG) contractors in the northeast. A survey was conducted c) Electro Jet Drilling (EJD) among 215 civil contractors of the Northeast region of 4. Thermal/Electrothermal Processes: the United States and the results were documented in a) Electro Discharge Machining (EDM) various categories. The paper presents aspects regarding b) Laser Beam (LBM) an innovative nonconventional technology, abrasive c) Plasma Arc (PAM) water jet machining. The study also presents results d) Electron-Beam (EBM) regarding other technological operations possible to be e) Ion-Beam (IBM) performed with abrasive water jet. It appeared after studying the advantages and disadvantages of the Dr. Norman Franz is regarded as the father of the water waterjet, that this is a tool that the construction industry jet. He was the first person to study the use of high- should find very useful. Unfortunately, this does not pressure water as a cutting tool. If we want to clean the seem to be the case. Many of the regional companies do area outside the home/office/school we throw water not seem to have any significant knowledge of the with high pressure so that the dirt gets washed away. A waterjet, thus remaining unwilling to employ this stream of water generated through a pipe that flows with technology. The responses that we have received have high pressure washes away the mud. Similarly, a jet of left us with the inability to comment on the cost water may be used to cut a sheet of metal. If the jet of effectiveness of the water jet in the construction water is directed on the metal sheet is such a way that on industry. The majority of companies that we contacted striking on the surface, the high velocity flow is virtually do not employ the water jet in their companies, nor do flow is virtually stopped, then most of the kinetic energy most of them have any knowledge of the abrasive water of the water is converted into pressure energy that jet. These companies seem to be conservative to new induces high stresses in the material. The water jet is technology and unwilling to take risks. This may also be nothing but passing the water in small diameter nozzle due to the fact that many companies are unwilling to to increase its velocity. The high velocity water jet with invest in a new technology that is not widely used. The the velocity upto the twice speed of the sound when contractors that do employ the abrasive water jet strikes on the workpiece removes material easily. technology did not provide us with the percentage of cost benefit to their company [1]. The key element in water jet machining (WJM) is a water jet, which travels at velocities as high as 900 m/s. When Jiazhong Xu, Bo You, Xiangbing Kong carried out the the stream strikes a workpiece surface, the erosive force Design and Experiment Research on Abrasive Water-jet of water removes the material rapidly. The water, in this Cutting Machine Based on Phased Intensifier states that case, acts like a saw and cuts a narrow groove in the to solve the problem of water pressure fluctuation workpiece material. Water jet cutting can reduce the caused by the traditional double-acting intensifier, the costs and speed up the processes by eliminating or paper has designed abrasive water-jet cutting machine reducing expensive secondary machining process. Since based on phased intensifier as well as open numerical no heat is applied on the materials, cut edges are clean control system. The structure of cutting machine as well with minimal burr. Problems such as cracked edge as the hardware structure and working principle of defects, crystallisation, hardening, reduced weldability phased intensifier are introduced. The phased intensifier and machinability are reduced in this process.