... used to transport abrasives from a hopper to the nozzle abrasive chamber via a suction hose. A typical abrasive material ...

The objective of this project was to develop the functional requirements and conceptual design for the next generation abrasive waterjet machining center. This system will elevate the machining capabilities of the abrasive waterjet process to those of con...

Waterjets are coherent streams of high-velocity water that can be used to cut soft materials. Abrasive waterjets have fine abrasive particles entrained in the waterjet and serve as a unique tool for machining very hard tough, or brittle materials. The obj...

According to the Waterjet Web Reference, "abrasive waterjets are the fastest growing segment of the machine tool industry." This is not surprising when considering how quickly and precisely a tool can be made by using the technology. The site offers a thorough introduction to waterjets, ...

An experimental investigation was conducted to determine the feasibility of machining isogrid structures with abrasive-waterjets (AWJs). The main objective was to mill isogrid patterns in surfaces with accurate depth control using an AWJ. Three different ...

The purpose of this investigation was to simulate a machining front from an abrasive waterjet and its movements in a ceramic material. Wear factors affecting the abrasive waterjet nozzle were also to be established. Therefore, a low inclination angle (9[degree]) was used between the nozzle and ...

An in-depth discussion of waterjet operation and applications is available here from the Research Center for Advanced Manufacturing (RCAM) at Southern Methodist University. Waterjets are often cited as being much more precise than traditional machining techniques. Be sure not to miss the Next Page button at the bottom; this site is ...

High velocity fluid jets (especially non-abrasive waterjets) may be ideally suited for the size reduction of excess high explosives that are to be recycled or destroyed. The fundamental interaction mechanisms between a waterjet and its target are investig...

This Phase 1 SBIR project addressed the feasibility of using abrasive-waterjet (AWJ) machining technology for the repair of jet engine components fabricated from composites. AWJ milling techniques were adapted to remove precise amounts of the composite ma...

High velocity fluid jets (especially non-abrasive waterjets) may be ideally suited for the size reduction of excess high explosives that are to be recycled or destroyed. The fundamental interaction mechanisms between a waterjet and its target are investigated for the purpose of assessing the safety of waterjet ...

The usefulness of high-pressure waterjets in cutting hard materials such as concrete, rock, and minerals was significantly improved by entraining selective abrasives into the waterjet. In fact, good entrainment of abrasives into the waterjet was found to ...

The use of abrasive waterjet (AWJ) cutting systems in the industrial sector has been limited to applications that are difficult to machine using conventional methods. A major factor for this limited use is the high cost of the garnet abrasive currently us...

This book describes a machining technique called Waterjet cutting, also referred to as hydrodynamic machining. It is an advanced technology cutting tool that uses a stream of ultrahigh-pressure water forced through a sapphire nozzle. The waterjet removes workpiece material and produces a narrow kerf by the cutting ...

... Table 2. Abrasives Used in Abrasive Waterjet Cutting. Adapted from reference 13. 500 - I Abrasive I Knoop Hardness 1 ...

... Testing performed by Alliant Techsystems with abrasives aspirated into the fluid stream, known as abrasive waterjets, have cut almost 200,000 ...

... performed into the mechanisms of spark formation, explosive initiation, and waterjet cutting process has shown that these sparks are benign when ...

... Most nonmetals can be cut rapidly and efficiently with a waterjet. Cutting applications include paper, cloth, wood, plastics, fiberglass, and rocks of ...

This paper addresses an experimental investigation on the feasibility of using abrasive-waterjets (AWJs) for the precision drilling of small-diameter holes in advanced aircraft engine components. These components are sprayed with ceramic thermal barrier coating (TBC), and the required holes are typically 0.025 inch in diameter, with a drilling angle of 25 deg. The parameters ...

... Title : Monitoring of Thermal Energy Distribution in Abrasive Waterjet Cutting Using Infrared Thermography. Descriptive Note : Journal article,. ...

A new technique to fabricate ultra-lightweight glass mirrors using high-velocity abrasive-waterjets (AWJs) is proposed for the milling of pockets in glass ...

Basic machining processes are introduced on this site that is devoted to engineering fundamentals. Descriptions and illustrations of drilling, turning, grinding, and other common processes are provided for people with little to no prior machining knowledge. A waterjet is a non-traditional machining technology that ...

Different cuts and constraints associated with abrasive waterjet machining of metal-matrix components are discussed, as well as cutting parameters for aluminum and titanium fiber composites. Three types of metal-matrix composite machining are identified: test-coupon machining involving axial ...

The U.S. Bureau of Mines undertook a basic investigation of collimated abrasive water-jet behavior because a more complete understanding of the fundamental process may lead to further technical advances. Laboratory experiments used 2-mm water-jet nozzles ...

Advances in cutting, grinding, and machining technology are examined in reviews and reports. Topics examined include water-jet and hydrodynamic cutting and machining, electrochemical techniques, lasers in machining, abrasive jet and flow machining, and ultrasonic ...

Basic machining processes are introduced on a Web site that is devoted to engineering fundamentals (1). Descriptions and illustrations of drilling, turning, grinding, and other common processes are provided for people with little to no prior machining knowledge. A waterjet is a non-traditional machining technology ...

Sparks have been frequently noted in the process of abrasive waterjet cutting of explosive ordnance. These sparks have not, however, caused an ignition event in the nearly 200,000 items cut to date. Research performed into the mechanisms of spark formatio...

This report presents an overview of the use of water-abrasive jets for cutting. Specific references to industrial uses are given.

This project addresses a new jet cutting technique termed abrasive suspension jet. An abrasive suspension is formed by mixing abrasives and water in addition to suspension stabilizing additives. The abrasive suspension is then pumped through a nozzle to f...

The use of abrasive waterjet (AWJ) cutting systems in the industrial sector has been limited to applications that are difficult to machine using conventional methods. A major factor for this limited use is the high cost of the garnet abrasive currently used. Initial studies indicated that glass can be processed to ...

Four magnesium/boron carbide metal matrix composite (MMC) tensile specimens fabricated using the waterjet machining method were evaluated in order to determine the effects of the waterjet material removal process on the composite material surface structur...

The optimisation of a manufacturing process involves, among other factors, the correct selection of the technologies for being applied in the process development. Nowadays, contour/profile milling is commonly used as a previous stage for pre-forming airship structural elements before being plastically deformed. Up to the time, contour milling processes is usually performed by High Speed ...

This paper reviews the history of development of waterjet drilling and cutting technology and its applications to both coal and hardrock mining situations. It discusses the performance and design of various waterjet drills and the required water pressure used to drill a hole. The majority of the paper describes the development of ...

Results are presented of an investigation of the effect on cutting of certain abrasive-jet parameters. Two cutting modes that may be obtained during abrasive-jet cutting are identified. The first, cutting wear, is a micromachining process that contributes...

An experimental investigation was conducted to determine the feasibility of machining isogrid structures with abrasive-waterjets (AWJs). The main objective was to mill isogrid patterns in surfaces with accurate depth control using an AWJ. Three different approaches using AWJs were tested: linear cutting of isogrid patterns for diffusion bonding, milling ...

... fibers. Center hole notches were machined into specimens using conventional machining, laser drilling, or waterjet cutting. ...

... Honing is a centerless machining operation, where the abrasive stones (honing ... centerless machining is permitted by coupling the abrasives to the ...

This set of tutorials and practice problems on manufacturing engineering is part of a larger collection of materials in the Engineer on a Disk series. Topics in the Manufacturing section include: 2. BASIC MANUFACTURING 3. MANUFACTURING COST ESTIMATING 4. BASIC CUTTING TOOLS 5. CUTTING THEORY 6. SAWS 7. DRILLING 8. LATHES 9. MILLING 10. GRINDING 11. SURFACES 35. METROLOGY 36. ASSEMBLY 42. ...

... and spade drills, diamond plated twist and core drills, and the abrasive waterjet hole cutting process were evaluated for drilling aluminum metal ...

... zirconia abrasive. Surface-active materials such as barium, phosphate and sulfate ions were used in the coatings. The ...

... ADD451914. Title : EFFECT OF MICROSTRUCTURE ON ABRASIVE MACHINING OF ADVANCED CERAMICS. Corporate Author : ...

... Accession Number : AD0682112. Title : ABRASIVE WEAR RESISTANCE OF CONSTRUCTIONAL MATERIALS AND MACHINE PARTS,. ...

... steel from the point of view of cutter life due to increased abrasive ... temperature and the abrasive capacity of the metal being machined ...

... Accession Number : ADD000263. Title : Abrasion Test Machine. Descriptive Note : Patent,. Corporate Author : DEPARTMENT ...

CNC water-jet machining was investigated to determine the potential applications and cost-effectiveness that would result by establishing this capability in the engineering shops of Allied-Signal Inc., Kansas City Division (KCD). Both conductive and nonco...

... 3. Abrasives are not affected by variations of surface quality whereas cutting tools need extra ... 4. Interrupted cuts do not affect abrasive machining. ...

The U.S. Bureau of Mines has patented and transferred to industry an abrasive-enhanced water-jet rock drill. The drill incorporates three novel components: a collimator, jet deflectors for cutting clearance, and an unpressurized swivel, which rotates at 1...

In laboratory testing, a prototype low-pressure abrasive water-jet system proved more effective in cutting concrete and asphalt than the high-pressure systems tested before. Projected operating costs for the hand-carried unit - a fraction of those of conventional concrete saws and carbide cutting wheels - could mean savings between $15,000 and $20,000 per ...

Since the 80's the water jet scalpel is an established tool in some surgical fields. It is used in particular in visceral surgery for preparation of parenchymatous organs. By the addition of biocompatible abrasives, this technique is able to effectively machine hard biological tissues. Free defined cutting geometries can be realised in a non contact ...

An apparatus for reducing clogs in a pneumatic material feed line, such as employed in abrasive waterjet machining systems, by providing an evenflow feed of material therethrough. The apparatus preferably includes a hollow housing defining a housing volume and having an inlet capable of connecting to an upstream portion of the ...

This report represents all testing and analysis of abrasive waterjet cutting technology performed by Flow Industries Inc. under EPRI research contract RP7860-1. Prior work, described in Volume 1, emphasized pure waterjet technology for purposes of cutting roadgrade substrates. Because of inadequate cutting, ...

Cutting edge waterjet innovations are the subject of this February 2003 feature from Forming & Fabricating, a publication of the Society of Manufacturing Engineers. Extremely high pressure nozzles are being developed to improve cutting speed and lowering costs, and enhanced software for controlling machine movements is also a focus of study.

The effects of dry-grid blasting of AWJ-machined dog-bone specimens of aircraft aluminum with aluminum oxide abrasives were investigated in terms of enhancement in fatigue performance and mitigating concerns of abrasive contamination. Results obtained from fatigue tests have indicated that the surface roughness, Ra, of AWJ-induced ...

This paper addresses an experimental investigation on the feasibility of using abrasive-waterjets (AWJs) for the precision drilling of small-diameter holes in advanced aircraft engine components. These components are sprayed with ceramic thermal barrier coating (TBC), and the required holes are typically 0.025 in. in diameter with a drilling angle of 25 deg. The parameters of ...

This paper seeks to identify such a standard procedure with an explanation with the reasons for choice with the different stages undertaken. As an example case the design of a system for optimizing the cutting of granite is described. The paper discussed the results in light of the way in which the waterjets penetrate the granite. Improvements in performance of the system with ...

Many developments have contributed to the increased productivity of grinding in the past few years. The one that has attracted the most attention is 'abrasive machining'. The term 'abrasive machining' has been expressed in many ways. It is generally used ...

A high-pressure, abrasive water-jet system that removes road-grade pavement offers utilities a financially attractive way of reducing the installation costs of underground cables. This system, mounted on a vehicular power supply and street tested, demonstrated that it can economically and quietly achieve cutting depths of up to 8 in.

... Accession Number : ADD877716. Title : ABRASIVE JET MACHINING UNIT TRIMS VOLTAGE REGULATOR MODULES. Corporate Author : ...

Sandia National Laboratories developed a process to identify and remove the hazardous sub-components from dismantled weapons components utilizing real-time radiography and abrasive water-jet cutting. The components were then crushed, granulated, screened,...

Polycrystalline diamond (PCD) tipped twist and spade drills, diamond plated twist and core drills, and the abrasive waterjet hole cutting process were evaluated for drilling aluminum metal matrix composites reinforced with SiC fibers or particulates. The ...

... A more efficient lubricooling effect can be achieved by the use of a high-pressure water jet directed into the tool/chip interface. ...

... SHAFTS(MACHINE ELEMENTS), SEALIFT OPERATIONS, FLOW, MARINE TRANSPORTATION, DISPLACEMENT, SCALE MODELS. ...

A new mining machine is constructed for use in room and pillar mining operations. This machine uses the action of computer controlled, centrally located high pressure cutting lances to cut deep slots in a coal face. These slots stress relieve the coal ahe...

This citation summarizes a one-page announcement of technology available for utilization. An assessment of abrasive machining in the fabrication of gun tubes has shown that crush-form abrasive grinding is faster and more economical than conventional turni...

...control device to keep the blade taut. (g) Abrasive wheels and machinery. (1) Abrasive wheels shall be used only on machines...of the wheel in case of breakage. (8) Abrasive wheels with operational defects shall...

An experimental study of abrasive waterjet (AWJ) cutting of beef, pork and lamb meat with and without bone is presented. Salt particles were used as the abrasives. It has been found that an AWJ could significantly increase the depth of cut with much improved cut quality in cutting pure meat as compared to plain (or pure) ...

... Diamond abrasive machining is necessarily and extensively used in the ceramics industry, but there are many limitations to its use. ...

... Accession Number : AD0257686. Title : METHODS OF FINISHING MACHINE PARTS USING ABRASIVE TOOLS (SELECTED PART). ...

... Title : Lasers Machine Hybrid Laminates. ... technologies in these materials are lasers and abrasive ... as widely used in industry as laser cutting, which ...

In the process of selecting a failed equipment cut-up tool for the Process Facility Modifications (PFM) Project, a system using an Abrasive Water Jet (AWJ) was developed and tested for remote disassembly of failed equipment by the Westinghouse Hanford Company, PFM Mechanical Development Unit.

...Abrasive Jet Machining, Electric Discharge Machining, Electrochemical Machining, Electron Beam Machining, Laser Beam Machining, Plasma Arc Machining, Ultrasonic Machining, Sintering, Laminating, Hot Dip Coating, Sputtering, Vapor ...

...Flame Spraying, Sand Blasting, Other Abrasive Jet Machining, Electric Discharge Machining, Electrochemical Machining, Electron Beam Machining, Laser Beam Machining, Plasma Arc Machining, Ultrasonic Machining, Sintering, ...

CNC water-jet machining was investigated to determine the potential applications and cost-effectiveness that would result by establishing this capability in the engineering shops of Allied-Signal Inc., Kansas City Division (KCD). Both conductive and nonconductive samples were machined at KCD on conventional ...

Computer Numerical Control (CNC) water-jet machining was investigated to determine the potential applications and cost-effectiveness that would result by establishing this capability in the engineering shops of Allied-Signal Inc., Kansas City Division (KCD). Both conductive and nonconductive samples were machined at KCD on conventional ...

Abrasive machining includes grit blasting, free abrasive machining, single point grinding and other processes, as well as multipoint grinding. The principal approach is to apply the techniques and theory of indentation fracture mechanics which have been d...

The book deals with theoretical and applied problems of the wear resistance of materials and machine parts. Main attention is devoted to abrasive wear which shortens the service life of agricultural, mining, construction, and other machines and industrial...

Construction of a second theater underground at the Gateway Arch in St. Louis required a quiet, non-intrusive means of rock removal, capable of cutting the vertical walls of the theater down to a depth of 4.5 meters, within a vertical accuracy of 2.5 cm. A low pressure (35 MPa) abrasive laden waterjet was developed for this; and, also modified as an ...

Water-assisted mining machinery is beginning to be considered in the US, although it has been in use in Europe for some time. A waterjet roof bolter is currently under test and should greatly increase drilling rate with longer bit life and no dust. Water-assisted roadheaders and longwall winning machines under development in Europe and the US are ...

The objective of the paper is to present some considerations concerning the phenomena which develop at the impact of the abrasive particles with the workpiece material, during the surface abrasive jet machining. The effects of impact depend on many factors. By taking into consideration the particles surfaces which act on the workpiece ...

This paper serves to report on a continuing investigation of the parameters controlling DIAjet cutting, with particular emphasis on the drilling and cutting of rock. DIAJET EQUIPMENT The equipment to be used in this work is a conventional commercially available direct injection of abrasive batch unit which is normally operated at jet pressures of up to 35 MPa. Water to the ...

Two workmen suffered avoidable fatal injuries from broken parts of abrasive wheels during inexpert handling of these machine tools. The high kinetic energy of these broken machine parts can exercise an effect like bullets. PMID:2568079

., "Abrasive Flow Machining", American Society of Mechanical Engineers, Production Engineering Division, New and is not suited for mass production of manifolds. The objectives of this research are to improve the functional network model is used to capture the nonlinear relationship between the AFM media and the specified

... Abstract : The forms and character of wear of hydraulic turbines, axial and centrifugal pumps due to abrasion by suspended accretions and ...

... to the hardness and abrasion of the ceramic reinforcement materials, for machining ... there occurs a different shape of tool wear when drilling fiber or ...

... EROSION, FRICTION, CHEMICAL INDUSTRY, INDUSTRIAL EQUIPMENT, ABRASION, MACHINE TOOL INDUSTRY, PAPER INDUSTRY. ...

A new mining machine is constructed for use in room and pillar mining operations. This machine uses the action of computer controlled, centrally located high pressure cutting lances to cut deep slots in a coal face. These slots stress relieve the coal ahead of the machine and outline blocks of coal. The movement forward of the ...

A new mining machine is constructed for use in room and pillar mining operations. This machine uses the action of computer controlled, centrally located high pressure cutting lances to cut deep slots in a coal face. These slots stress relieve the coal ahead of the machine and outline blocks of coal. The movement forward of the ...

The objective of this project was to create a system that delivered the appropriate information to the machine tool user just when needed and in the most appropriate form. The expertise of FM&T in the areas of instructional system design and multimedia cr...

The author reviews developments in face-end machinery in the UK, West Germany and US. Automatic control systems such as MIDAS and MINOS are considered, as well as water-jet assisted cutting and machine health monitoring.

... Title : Machining boron-epoxy composites. ... Diamond abrasive tools are required for cutting boron-epoxy and multilayer boron-epoxy/ titanium. ...

... to grind a small, one piece gas turbine rotor out of ... to drive abrasive slurries in accomplishing the machining. ... of fair quality were machined using the ...

The presence of hard abrasive particles in the impact zone between parts of machines is the reason for their intensiveabrasive-impact wear. No attempt to analytically account for the features of the interaction of hard abrasive particles with the wear surface during impact has been made, even though such information is needed to ...

Sandia National Laboratories developed a process to identify and remove the hazardous sub-components from dismantled weapons components utilizing real-time radiography and abrasive water-jet cutting. The components were then crushed, granulated, screened, and separated into an aluminium and a precious-and-base-metals fraction using air-tables. Plastics ...

Two concrete-cutting technologies utilizing high-pressure waterjets have been investigated to assess their feasibility in achieving rapid cutting rates (30 sq ft/min) to facilitate bomb damage repair to runways. The current cutting rate of abrasive waterj...

An engineering prototype multipurpose construction and maintenance vehicle (MCMV) was developed for gas utilities to service distribution systems buried under pavement. The vehicle incorporates an abrasive waterjet to cut pavement, a vacuum bell to lift i...

The fracture behavior of 0 DEG/90 DEG sub 3s cross-plied ceramic-matrix composites is evaluated using compact tension specimens. The influence of notch preparation (abrasive water-jet or diamond saw cut) and fatigue precracking is investigated. The extent...

Waterjet-assisted cutting is discussed as a method of bringing improvements in bit life, productivity, and health and safety to mining machines. The cutter closest to commercial production, called the JB2-H Jetbolter, is examined and its on-site modifications are described. The system is designed for water to do 85% of the work. The Jetbolter is designed ...

El Paso Natural Gas Co. (EPNG) has recently employed high-pressure waterjet technology to remove pipeline corrosion and coatings as part of its ongoing maintenance program. New technology. The use of high pressure waterjets is an improvement on the older use of brushes and scrapers to clean pipe.. In some cases, the coating was removed by hand with hammers ...

A systematic study of abrasive wear resistance of Fe/Cr/Mn based alloys has been carried out using a two body pin-on-disc wear machine. Abrasives used were silicon carbide, alumina and quartz. The objective of this study was to evaluate the abrasive wear ...

A method for fabricating a tool used in cutting, grinding and machining operations, is provided. The method is used to deposit a mixture comprising an abrasive material and a bonding material on a tool surface. The materials are propelled toward the receiving surface of the tool substrate using a thermal spray process. The thermal spray process melts the ...

Material removal rate, surface finish, and subsurface damage are largely governed by fracture mechanics and plastic deformation, when ceramics are machined using abrasive methods. A great deal of work was published on the fracture mechanics of ceramics in the late 1970s and early 1980s, although this work has never resulted in a comprehensive model of the ...

Free abrasive machining (FAM) is widely used for stock removal and surface finishing of ceramics. In FAM, material removal results from mechanical action between the abrasive slurry, which is trapped between the workpiece and a rotating lapping block, and the workpiece. Microscopic observations of the machined ...

The two main objectives of this work is (1) to develop a mathematical model to efficiently capture the fracture behavior of materials undergoing thermal shock and (2) to design and develop a mechanics based hybrid laser/waterjet manufacturing process that will be able to machine hard and brittle materials at higher speeds and with better cut quality. The ...

The last 25 years has seen a dramatic growth in the use of high pressure waterjets for cleaning purposes. Throughout recorded history and no doubt for a long time before that, the dual role of water as both a solvent and a lubricant has been one of the major ways of washing surfaces down regardless of what the surface was. Also, the power built into a ...

This book contains 12 papers. Some of the titles are: Abrasive flow machining - A process for surface finishing and deburring of workpieces with a complicated shape by means of and abrasive laden medium; Material removal rate in abrasive jet machining: An elastro-plastic model; ...

A water jet process has been developed to reduce hemispherical explosive shells to a form that can be recycled. A funnel shaped wet box was modified to hold the shells in place and contain all the explosive chips and slurry generated by the waterjet process. Size reduction was accomplished by cutting in spiral patterns starting at the center of the shell and moving outward. ...

...rays, hot metal, or sparks from welding or cutting. (d) Abrasive blasting and spray painting. Longshoring operations shall not be carried on in the immediate vicinity of abrasive blasting or spray painting operations. (e) Machine...

Abrasive wear is the most common type of wear that causes failure of machine elements. Examinations of abraded surfaces revealed presence of embedded particles and grooves elongated along the sliding direction. This indicates that, there are two sequential stages of an abrasion process. In the first stage, asperities on the hard ...

The response to thermal cycling of a set of W-1% ThO{sub 2} reinforced Fe-25Cr-8Al-.50Y superalloy matrix composites was studied. During this research, unique composite materials were produced by powder-metallurgical processing. These materials were three aligned composites of differing reinforcement aspect ratio, and a hierarchic composite that included fine-diameter Al{sub 2}O{sub 3} fibers. ...

The durability of screw and cylinder of thermoplastic machines processing glass reinforced resins such as polyamides at temperatures of the order of 300C is studied. The behavior of protective coatings including metallic coatings such as treated superallo...

Conventional mining of coal on longwall faces, is largely by use of the shearer-loader cutting system. In this type of mining, closely allied in concept to the continuous miner of room and pillar mining, the coal is, virtually exclusively, extracted by the impact of mechanical cutting bits. Each unit volume of the coal is extracted in the same manner, and thus a relatively constant specific energy ...

... in the form of scratch-free surfaces was not obtained in the case of MgO, which was polished using talc, rock salt, calcite, and fluorite as abrasives. ...

... Descriptive Note : Conference paper,. Corporate Author : Personal Author(s) : Corsini, AM ; Indige, JH. Report Date : 1990. ...

by machining a step in the bottom of the photodetector housing. This step was used to locate the circuit board which held the GaAs solar cells. Black anodized ...

... Descriptors : *Ordnance steel, *Forging, *Guns, Machinability, crucibles, Chemical composition, Abrasives, Toughness, Hot working, Fine grained ...

Low-cost, portable machine cuts ducts made from heat-treated alloys. An abrasive wheel, powered by a

abrasive polishing, chemical assisted polishing, or grinding. ... To compare the capability of the grinding machine equipped with each of the two spindles, ...

... 304 STAINLESS STEEL AT MODERATE TO HIGH RATES OF STOCK REMOVAL USING A BUFFERED TRI-POTASSIUM PHOSPHATE SOLUTION ...

... CBN coated grinding worms, and abrasive polishing worms. ... with CNC-grinding machine and special geometrical corrections on the grinding worm. ...

... from federally funded research, testing and training ... and wear on a test machine which is ... Tanks (tracked vehicles), Wear, Abrasion resistance, Field ...

... For drilling difficult-to-machine materials, abrasive water jet (AWJ) drilling provides several ... is used to study the material removal mechanisms ...

... machine. Dacron tape (Coftnecti~ut Hard Rubber Co., New Haven, Connecticut, Temp R- Tape) sandwiched be tween ...

Measurements on 5:1 Scale Abrasive Water Jet Cutting Head Models P.S. Coray1 , B. Jurisevic2 , M. Junkar2 and K.C. Heiniger1 1 Swiss Competence Centre of Water Jet Technology, Laboratory for Thermal There is a vast potential market for high precision parts manufactured by abrasive water jet (AWJ) machining

The technology to cut objects in the ocean's depths with abrasive water jets was examined for possible application in view of the greater water depths and sophistication involved in work on the ocean floor today. A test model was developed to study this technology's safety and practicability. The test model was designed for use at great water depths and has functions and a ...

Abrasive waterjet (AWJ) peening is a new mechanical surface treatment process envisioned for use on metal orthopedic implants. The process utilizes an abrasive waterjet to simultaneously texture and work harden the surface of a metal substrate through controlled hydrodynamic erosion. In this study, a titanium alloy ...

Water-jet cutting techniques have been used in industrial applications for many different materials. Recently these techniques have been developed into a revolutionary cutting tool for soft tissues in visceral surgery. The present study investigates the usage of this cutting technology for the revision surgery of endoprostheses. In the first part of the study, samples of ...

A technique used for improving the performance and durability of aircraft turbine engines by flowing abrasive media through critical components is described. The process is abrasive only where the flow is restricted: the extrusion area (the process is also known as extrusion honing). Process parameters including extrusion pressure and the volume of flow ...

The authors describe work that was carried out to determine the possibility of using cutting tools with abrasion-resistant coatings of titanium nitride for processing the components of oil-well pumps. For the tests, 40 tetra- and pentahedral nonsharpenable blades with abrasion-resistant titanium nitride coating were produced. Pentahedral blades were used ...

... used to pummel the blue jeans inside large washing machines. Pumice is a porous, light-weight volcanic rock. ... jeans are subject to the normal abrasion of machine washing, the weakened threads break and...

This article deals with the selection of materials for forming wear resistant layers within agricultural machine parts wear. We can achieve required hardness, wear resistance and life extension of agricultural machine parts and tools by the selection of a suitable material and surfacing technology.

Material removal rate, surface finish, and subsurface damage are largely governed by fracture mechanics and plastic deformation, when ceramics are machined using abrasive methods. A great deal of work was published on the fracture mechanics of ceramics in...

As a result of the increase in the use of difficult-to-machine materials more and more machining tasks are falling within the sphere of grinding. Since the requirements that must be met by the working accuracy under conditions of high productivity of the ...

Machining and surface preparation of advanced ceramic materials was assessed. Abrasive processes, including the commercially used process of traditional diamond grinding, are reviewed. Mechanisms of material removal are described to familiarize the reader...

and a moving part of the machine, burned by hot surfaces or exposed to electric shock Full-revolution clutchMachine Safeguarding Terms Department: Chemical and General Safety Program: Machine Safeguarding Owner: Program Manager, Linda Knudsen Authority: ES&H Manual, Chapter 39, Machine Safeguarding ...

Unidirectional graphite/epoxy composite material has been machined by water jet and abrasive water jet cutting processes. Topography and morphology of the machined surfaces were evaluated with surface profilometry and scanning electron microscopy. The surface characteristics in terms of roughness and the micromechanisms of material ...

A project was established to reduce current stock removal costs and eliminate finish turning operations of tubes by combining rough stock removal and finish grinding. The first phase was designated for engineering and investigation into the feasibility and application of abrasive belt grinding technology. This information was then used to generate a specification establishing ...

An analytical description is presented for the process of the bulk-abrasive finish machining of screw-shaped parts whereby a rotating part is brought into contact with a bulk abrasive that is centrifugally densified in a rotating container. The analytical description makes it possible to determine the effect of generalized process ...

The authors examine the relationships between the ultrasonic machining, grain size, and wear resistance of boron and silicon carbides, candidate tool materials for cutting nitride ceramics. On the basis of mechanical tests and microscopic and fractographic analysis they recommend grain sizes of 60-100 micrometers for boron carbide and 80-100 micrometers for silicon carbide for ...

Federally-sponsored research on the design, performance, wear, and maintenance of diamond tools is cited. Material removal processes such as surface finishing, drilling, and precision machining are examined. The abrasiveness of diamond tools is compared with the abrasiveness of other hard materials. Processing of ceramics, laser ...

An abrasive slurry particularly suited for use in drilling or machining boron carbide consists essentially of a suspension of boron carbide and/or silicon carbide grit in a carrier solution consisting essentially of a dilute solution of alkylaryl polyether alcohol in octyl alcohol. The alkylaryl polyether alcohol functions as a wetting agent which improves ...

An abrasive slurry particularly suited for use in drilling or machining boron carbide consists essentially of a suspension of boron carbide and/or silicon carbide grit in a carrier solution consisting essentially of a dilute solution of alkylaryl polyether alcohol in octyl alcohol. The alkylaryl polyether alcohol functions as a wetting agent which improves ...

An abrasive slurry particularly suited for use in drilling or machining boron carbide consists essentially of a suspension of boron carbide and/or silicon carbide grit in a carrier solution consisting essentially of a dilute solution of alkylaryl polyether alcohol in octyl alcohol. The alkylaryl polyether alcohol functions as a wetting agent which improves ...

The content of abrasion products from the moving parts of an Amsler machine, labeled with Co/sup 60/, was determined in the machine oil from the radioactivity using a scintillation counter. The efficiency of the apparatus is 11% at a gamma -quantum energy of >1 Mev. (Referativnyy Zhurnal, Khimiya, No. 22, 1982)

Hardness and toughness are often used to analyze the abrasive machining behavior of ceramic materials. However, toughness values of silicon nitride ceramics with microstructures containing elongated grains increase with microstructures containing elongated grains increase with crack extension. The present study investigates the effect of toughness on the ...