., "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

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

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 ...

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 ...

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

... 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 ...

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

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 ...

... Title : Development of an Abrasive Water Jet Optimum Abrasive Flow Rate Model for Titanium Alloy Cutting (Preprint). Descriptive ...

... Title : The Effect of Flow Rate and Abrasion on the Efficiency of Anodic Protection of Stainless Steel in Concentrated Sulphuric Acid,. ...

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 ...

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

On-site observation of the operation of hydraulic machines and the long experience of operating and pumping stations show that abrasive and cavitation-abrasive wear play the main role in the failure of parts of hydraulic turbines and pumps operating on streams with a high turbidity. The effect of wear as a result of cavitation and the ...

At the All-Union Scientific-Research and Design Institute for Chemical and Petroleum Apparatus Building Technology, Volgograd, a special machine has been designed and built and investigations have been made to provide tool working surfaces with high quality. Finds that the increase in surface quality of the rolling tools as a result of abrasive grinding ...

A hot cylinder for a cryogenic refrigerator having two plasma spray deposited rider rings of a corrosion and abrasion resistant material provided in the rider ring grooves, wherein the rider rings are machined to the desired diameter and width after deposition. The rider rings have gas flow flats machined on their ...

Results are reported supporting the feasibility of manufacturing high precision machined triangular pitch Zircaloy-4 fuel rod support grids for application in water cooled nuclear power reactors. The manufacturing processes investigated included wire elec...

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...

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...

... 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 ...

...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, ...

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 ...

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...

... Title : The Theory of Discontinuous Machining. A Plastic Flow Problem Arising in the Theory of Discontinuous Machining,. ...

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 ...

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

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 ...

... 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. ...

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 ...

Optical polishing with magnetic media has evolved extensively over the past decade. Of the approaches conceived during this time, the newest process is called magnetorheological finishing (MRF). In MRF, all of the process parameters are controlled by utilizing the state of hydrodynamic flow of a magnetically stiffened magnetorheological abrasive fluid ...

Results show that increased deformation in Duralumin during age hardening and after annealing increases the wear resistance to flowing abrasive particles. (R.V.J.)

... Accession Number : ADA172494. Title : Abrasion-Erosion Evaluation of Concrete Mixtures for Repair of Low-Flow Channel, Los Angeles, River. ...

... 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 ...

As the abrasive water jet (AWJ) is used in industry extensively, optimization of the process parameters that determine efficiency, economy and quality of the process is becoming more and more important for its successful application. However, being a comp...

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 test sample, simulating a moving ...

The quality of bone cuts is assessed by the accuracy and biological potency of the cut surfaces. Conventional tools (such as saws and milling machines) can cause thermal damage to bone tissue. Water jet cutting is nonthermal; that is, it does not generate heat. This study investigates whether the abrasive jet cutting quality in cancellous bone with a ...

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 ...

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...

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 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...

...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...

We have determined experimentally the rate of abrasive wear of rock on rock for a range of rock types as a function of normal stress and shear displacement. Unlike abrasive wear in fault zones, where wear products accumulate as a thickening gouge zone, in our experiments wear particles were removed by flowing water. The experiments ...

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 ...

... 1899/07-123.1 More microbial activity, not abrasive flow or shredder abundance, accelerates breakdown of labile ... associated ...

... CLEANING, *SPRAYERS, AIR FLOW, AIRCRAFT ... AIRCRAFT ENGINES, CLEANING COMPOUNDS ... ABRASIVES PUMPS, FILTERS, PIPES, TUBING ...

... Descriptors : *COMPRESSOR BLADES, *COMPRESSOR COMPONENTS, *ABRASION, *AXIAL FLOW COMPRESSORS, *FIBER METALLURGY ...

... a flow of gas under conditions ... Descriptors : *BLAST FURNACES, CORROSION INHIBITION ... ELECTROCHEMISTRY, CORROSIVE GASES, WEAR ...

Discrete Model is based on the description of the physical state (velocity, position, temperature, magnetic moment, electric potential ..) of a large number of discrete elements that form the media to be studied. It is not based on a continuous description of the media. Then, it is particularly well adapted to describe media evolution driven by discontinuous phenomena: multi fracturation problems ...

The electrical submersible pump (ESP) is a high-speed rotating device. Its operational life in oil wells can depend on the type and quantities of abrasives present in the produced fluid. This paper reports on a set of experiments performed in a specialized abrasive test loop. In the test, the size and quantity of abrasives were varied ...

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...

... 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 form measurement and gauge repeatability and reproducibility (R&R) of a micro-hole using a coordinate measurement machine (CMM) with a combination of optical and contact sensors were conducted in this study. The micro-holes, about 160 �m in diameter and 0.9 mm in depth, were fabricated using the electrical discharge machining process for diesel ...

Results are reported supporting the feasibility of manufacturing high precision machined triangular pitch Zircaloy-4 fuel rod support grids for application in water cooled nuclear power reactors. The manufacturing processes investigated included wire electrical discharge machining of the fuel rod and guide tube cells in Zircaloy plate stock to provide the ...

A ball valve assembly is disclosed for controlling the flow of abrasive particulates including an enlarged section at the bore inlet and an enlarged section at the bore outlet. A refractory ceramic annular deflector is positioned in each of the enlarged sections, substantially extending the useful life of the valve.

A ball valve assembly for controlling the flow of abrasive particulates including an enlarged section at the bore inlet and an enlarged section at the bore outlet. A refractory ceramic annular deflector is positioned in each of the enlarged sections, substantially extending the useful life of the valve.

The invention is a flow and pressure-sealing valve for use with abrasive solids. The valve embodies special features which provide for long, reliable operating lifetimes in solids-handling service. The valve includes upper and lower transversely slidable ...

The Bureau of Reclamation's Water Resources Research Laboratory conducted a 1:50-scale model study of the Folsom Dam service spillway and stilling basin. The purpose of the study was to evaluate flow conditions contributing to abrasion damage in the still...

Contents: Peculiarities of a micro-impact load in cavitation-abrasive action; Cavitation and cavitation-abrasive wear in the flow around a rectangular projection by a hydroabrasive current; Structure and properties of cavitation-resistant steel 30Kh10G10;...

The study of the application of free filamentary composites in ''pile''-like structures and linings is aimed at cost effective alternatives to the life limiting abrasive and galling wear experienced in solid member flow systems and system elements. The ba...

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 ...

A dry abrasive decontamination method was developed for removing radioactive corrosion products from surfaces of coolant pipe systems in decommissioning of a nuclear power plant. Erosion behavior of inside surfaces of stainless and carbon steel pipes by a swirling air flow containing alumina or cast-iron grit abrasive was studied. ...

... 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 ...

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, describing how they work and what they can do. Comparisons are made to ...

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 actually three separate pages of topics. ...

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)

... Abstract : This paper presents a discussion of the application of data-flow machine concepts to the design and implementation of database ...

The results of a study are reported here on the effects of surface preparation on the shape of GTA welds on JBK-75, an austenitic precipitation hardenable stainless steel similar to A286. Minor changes in surface (weld groove) preparation produced substantial changes in the penetration characteristics and welding behavior of this alloy. Increased and more consistent weld penetration (higher d/w ...

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 ...

We consider the problem of scheduling jobs on multiple machines with preemption with the goal of minimizing the total flow time and the maximum flow time. For minimizing total flow time...

Recent technoligical advancement demands new robust micro-components made out of engineering materials. The prevalent methods of manufacturing at micro-nano level are established mostly for silicon structures. Therefore, there is interest to develop technologies for micro-fabrication of non silicon materials. This research studies microend-milling of 316L stainless steel. ...

This manual was developed to guide machine trades instructors and vocational supervisors in sequencing laboratory instruction and controlling the flow of work for a 2-year machine trades training program. The first part of the guide provides information on program management (program description, safety concerns, academic issues, ...

A slurry recycle process for use in free-abrasive machining operations such as for wire saws used in wafer slicing of ingots, where the used slurry is separated into kerf-rich and abrasive-rich components, and the abrasive-rich component is reconstituted into a makeup slurry. During the process, the average ...

Contacting components frequently fail by abrasion caused by solid contaminants in the lubricant. This process can be classified as a closed three-body abrasive wear process. The mechanisms by which trapped particles cause material removal are not fully understood. This paper describes tests using model elastohydrodynamic contacts to study these mechanisms. ...

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 resistance and to investigate the relationships between ...

The properties of composite resin for dental fillings were improved by development, but its weakness continues to be its wear strength. Several tests have been proposed to evaluate wear in composite resin materials. The aim of this study was to verify how polishing and the type of abrasive can influence the wear rate of composite resin. The test was carried out on two groups. ...

A method is provided for making microwave-sintered, free flowing alpha alumina-based ceramic abrasive grain, under conditions effective to couple microwaves with calcined alpha alumina-based abrasive gain precursor and sinter it at a temperature of at least about 1150.degree. C.

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 uses high pressure ...

... from federally funded research, testing and training ... for Research Development Test and Evaluation ... Evidence of abrasion and localized plastic flow ...

Sand pumps for pumping abrasive water mixtures are made of Kh3ON2 wear-resistant alloy, a metal of high hardness. The electrocontact machining method was selected as the machining of this metal of high hardness as normal methods were very complex. The machining conditions, parts, and processes are specified. ...