... IN A RUBBER-WHEEL ABRASION TEST (RWAT) AND ... IN A GRINDING WHEEL TEST (GWAT ... WEAR TESTING ON THE WHITE IRONS HAS BEEN ...
DTIC Science & Technology
... to raise the degree of finish in grinding nonmetallic materials ... Descriptors : (*DIAMOND WHEELS, ABRASIVES), DIAMONDS, POWDERS, BINDERS ...
Date: 03.26.1998. Title: ABRASIVE GRINDING WHEELS. Description: ABRASIVE GRINDING WHEELS. ID: C-1998-00645. Credit: NASA Glenn Research Center (NASA-GRC) ...
NASA Website
A grinding wheel with fine abrasives is conventionally applied for precision grinding. In particular the precision grinding of brittle materials in the region of ductile mode chip removal is based on the fine abrasive with grain size of a few micron to sub-micron. This ...
NASA Astrophysics Data System (ADS)
... for corrosive flux; aluminum oxide ranks just under the diamond in hardness and is regularly used as an abrasive in grinding wheels and sandpaper ...
This report provides information about U.S. industry establishments primarily engaged in manufacturing abrasive grinding wheels of natural or synthetic materials, abrasive-coated products, and other abrasive products.
National Technical Information Service (NTIS)
This paper deals with the grinding characteristics of newly developed ultrafine-crystalline cBN (cBN-U) abrasive grains in creep feed profile grinding of high-speed steels. Experiments for producing a V-shaped groove on a flat surface in one pass by creep feed grinding have been carried out using new ...
A model of heat transfer in grinding has been developed that considers heat removed from the grinding zone by the workpiece, abrasive grains, and grinding fluid. This model eliminates the need to specify the fraction of the total grinding power that enters the workpiece, or the convection ...
Energy Citations Database
This paper describes the development of a high-performance vitrified bonded cBN grinding wheel using a new type of ultrafine-crystalline cBN (cBN-U) abrasive grain. Surface plunge grinding experiments using a vitrified wheel made of the cBN-U grains with a mesh size of #80/100 were carried out, ...
The thesis of this paper is that shear mode grinding of glass (1) occurs with abrasive particle sizes less than 1/mu/m, (2) that it is the mechanical limit of the the more common mechanical-chemical glass polishing, and (3) that the debris is insufficient in size to perform the function of eroding the binder in the grinding ...
... grinding-scratches (boron carbide as an abrasive on a cast iron wheel), turned out to be extremely time consuming ... 48 Page 52. ...
... operation, and they can partially replace grinding by turning or ... BORON NITRIDES, DRAWING(FORMING), DIAMOND WHEELS, EAST GERMANY. ...
... Abstract : Metal-bonded diamond grinding wheels are improved by the inclusion of from about 15% to about 60% by volume of granular boron ...
Boron nitride grinding tools can be used to advantage for the grinding of high speed steel (HSS) with a high vanadium content. the abrasives available to date are of limited value because the HSS materials contain very hard carbides, grinding of which, and of vanadium carbide in particular, results in very rapid ...
Wheel and belt recommendations, coolant requirements, and operational techniques for the surface, cylindrical, snagging, and cutoff grinding of Zr using SiC and AlO abrasives are presented. (Rev. Metal Lit., 19: No. 6, 1962)
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 ...
The grinding techniques and electro-deposited wheels suitable for a 13% Cr-Ni dental casting alloy were determined. The lever-type grinding test machine modified in the previous study was used to investigate the grinding performance of experimental wheels of CBN- and diamond-particles. ...
PubMed
A series of alloy white irons and Co-base superalloys are being tested for low-stress abrasion resistance in a rubber-wheel abrasion test (RWAT) and for gouging wear resistance in a grinding wheel test (GWAT). The objective of the tests is to establish ge...
Standard procedures have been developed for low-stress abrasion testing, based on a rubber wheel test system, and for gouging abrasion testing, based on a grinding wheel test system. AISI 1020 and 4340 steels have been evaluated as test standards for both...
Grinding forces and energy play an important role in all abrasive machining operations. While specific grinding energy may be obtained from workpiece dynamometer values or by measuring spindle power, care must be exercised in converting dynamometer reading into power consumed. This is particularly true for operations involving a large ...
Grinding forces and energy plan an important role in all abrasive machining operations. While specific grinding energy may be obtained from workpiece dynamometer values or by measuring spindle power, care must be exercised in converting dynamometer reading into power consumed. This is particularly true for operations involving a large ...
Attempts to use diamond or CBN grinding wheels for full cut or deep cutting processes in the machining of hard materials, were initially limited to grinding wheels coated by electrodeposition. The tool body was provided with the required profile and the diamond or CBN coating was electrodeposited in accordance with ...
Optics fabrication process for precision space optical parts includes bound abrasive grinding, loose abrasive lapping and polishing. The traditional bound abrasive grinding with bronze bond cupped diamond wheel leaves the machine marks of about 20 ?m rms in height and the ...
Correlation of the microstructural features of alloy cast irons and Co-base alloys to their wear resistance under room temperature low-stress and high-stress (gouging) abrasion is discussed. Low-stress abrasion resistance is determined on a dry-sand rubber wheel device, whereas high-stress abrasion resistance is ...
A method for precision cylindrical grinding of hard brittle materials, such as ceramics or glass and composites comprising ceramics or glass, provides material removal rates as high as 19--380 cm{sup 3}/min/cm. The abrasive tools used in the method comprise a strong, light weight wheel core bonded to a continuous rim of ...
A method for precision cylindrical grinding of hard brittle materials, such as ceramics or glass and composites comprising ceramics or glass, provides material removal rates as high as 19-380 cm.sup.3 /min/cm. The abrasive tools used in the method comprise a strong, light weight wheel core bonded to a continuous rim of ...
DOE Information Bridge
This paper reports on the feasibility of using Acoustic Emission (AE) for sensing the proximity of a grinding wheel to a glass workpiece, both prior to contact and in the early stages of contact. Our measured AE signals indicate that we can track the posi...
Abrasive particles and their preparation are discussed. The particles consist essentially of a matrix of titanium carbide and zirconium carbide, at least partially in solid solution form, and grains of crystalline titanium diboride dispersed throughout the carbide matrix. These abrasive particles are particularly useful as components of ...
This paper investigates both experimentally and theoretically the subsurface damage in alumina by ductile-mode grinding. It was found that the distribution of the fractured area on a ground mirror surface, with the Rms roughness in the range from 30 nm to 90 nm, depends on not only the grinding conditions but also the pores in the bulk material. Surface ...
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 working cycle are becoming ever more stringent, high-capacity grinding tools are essential. The ...
Aerostatic spindles are used in precision grinding applications requiring high stiffness and very low error motions (5 to 25 nm). Forces generated during precision grinding are small and present challenges for accurate and reliable process monitoring. These challenges are met by incorporating non-contact displacement sensors into an aerostatic spindle that ...
... Abstract : Coated abrasives grind at much lower ... How this affects grinding plate glass, marble ... both silicon carbide and diamond coated abrasive ...
This graphic dubbed by engineers as the 'Grinding Wheel Profile' is the detective's tool used by the
NASA Technical Reports Server (NTRS)
... Title : KEEPING GRINDING COSTS IN LINE. ... WITH THE RIGHT WHEELS, GRINDING SMOOTHS WELDS OR REMOVES BUILDUPS. ...
... Pagination or Media Count : 4. Descriptors : *Grinding wheels, *Cutting tools, Sintering, Grinding, Alloys, Grain size, Diamond wheels. ...
... Title : Abrasive Polishing (Grinding) of the Titanium Carbide Based Hard Metals and Sialon Ceramic (Silicon Nitride),. Descriptive ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... IN THE CF ON THE ABRASION OF GRINDING ...
... Descriptors : (*ABRASIVES), (*CERAMIC MATERIALS), BORON COMPOUNDS, CARBIDES, CORUNDUM, CRYSTAL STRUCTURE, GRINDERS ...
... Title : EXPERIMENTAL STUDY OF GRINDING FLUIDS FOR ABRASIVE ... Abstract : An optimum oil-based grinding fluid was sought for corrosion ...
Grinding Wheel Profile This graphic dubbed by engineers as the "Grinding Wheel Profile" is the detective's tool used by the Opportunity team to help them ...
... Title : Investigations on Laser Dressing of Grinding Wheels - Part II: Grinding Performance of a Laser Dressed Aluminum Oxide Wheel. ...
... Continue on roe.rso side It neceemary and Identify by block number) Kigh-Speed Abrasive Belt G'rinding; Coated Abrasives, Contact Weel , . 20. ...
This bibliography contains citations of selected patents concerning materials of cubic boron nitride (CBN) for machine tools and superhard abrasives. Included are methods of producing CBN compacts and abrasive structures for cutting tools, tool inserts, grinding wheels, wire drawing dies, gears, and drill bits. ...
The bibliography contains citations of selected patents concerning materials of cubic boron nitride (CBN) for machine tools and superhard abrasives. Included are methods of producing CBN compacts and abrasive structures for cutting tools, tool inserts, grinding wheels, wire drawing dies, gears, and drill bits. ...
... Accession Number : ADD810692. Title : Play it Safe at the Wheel: A Primer on Grinding Wheel Safety. Descriptive Note : Journal article,. ...
This paper reports on the feasibility of using Acoustic Emission (AE) for sensing the proximity of a grinding wheel to a glass workpiece, both prior to contact and in the early stages of contact. Our measured AE signals indicate that we can track the position of the grinding wheel as it approaches the workpiece ...
Shows how to mount a bushing on a mandrel, dress the side of the grinding wheel, set a dial snap gage for the production grinding of bushings, and rough- and finish-grind a bushing. Stresses rhythm in grinding.
This paper introduces the development of a high-speed grinding device for cylindrical grinding of microcomponents made of hard and brittle materials. The study made use of an ultraprecision diamond turning machine tool as a basic platform. The novelty of the device is based on the high-speed air bearing spindle with a thin grinding ...
The overall objective of this project is to develop sensor-integrated 'intelligent' diamond wheels for grinding of ceramics. Such wheels will be 'smart' enough to monitor and supervise both the wheel preparation and grinding processes without the need to ...
... Accession Number : ADD815175. Title : Which Diamond Grinding Wheel. Descriptive Note : Journal article,. Corporate Author : ...
... THE GRINDING TESTS WERE PERFORMED WITH TWO DIFFERENT DIAMOND WHEELS ON MG-PSZ AND WITH THREE DIFFERENT WHEELS ...
... Accession Number : ADD320669. Title : THE EVALUATION OF NDT TECHNIQUES FOR ABRASIVE WHEELS. Corporate Author : ...
This research concerns experimental and modeling results for the grinding of titanium aluminides. These intermetallic compounds have unique characteristics such as high strength-to-weight ratio and high corrosion resistance. The research has involved grinding at various conditions with an abrasive diamond wheel, ...
... CBN coated grinding worms, and abrasive polishing worms. ... with CNC-grinding machine and special geometrical corrections on the grinding worm. ...
... The machine can grind open outside and inside surfaces by the ... grinding wheels are dressed at the start of grinding by diamonds mounted near ...
Aug 6, 2011 ... The Mars Pathfinder Rover Wheel Abrasion Experiment was designed to study the abrasive wear of the martian soil on various types of metals ...
... AD0175434. Title : THE ELECTROLYTIC DRESSING OF DIAMOND WHEELS FOR USE IN STEEL GRINDING. Corporate Author : ...
This report summarizes research performed on abrasion of metallic alloys. The work was designed to improve our understanding of the factors affecting abrasion rates in two-phase alloys containing large, hard second-phase particles (SPPs) such as carbides, since this class of alloys generally has very high abrasion resistance owing to ...
Apr 16, 1996 ... NASA Lewis Research Center's Wheel Abrasion Experiment (WAE) will measure the amount of wear on wheel surfaces of the Mars Pathfinder rover. ...
This report describes Electrolytic In-process Dressing (ELID) as applied to the efficient, high-precision grinding of structural ceramics, and describes work performed jointly by Dr. B.P. Bandyopadhyay, University of North Dakota, and Dr. R. Ohmori, of the Institute of Physical and Chemical Research (RINEN), Tokyo, Japan, from June through August, 1994. Dr. Ohmori pioneered ...
... from federally funded research, testing and training ... standard rubber wheel abrasion test apparatus was ... for low stress abrasion tests; the abrasive ...
...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...
Code of Federal Regulations, 2010
The effects of dressing and grinding conditions on the change of microgeometry of the wheel surface are investigated. The impact on the macrogeometry of the wheel surface in plunge grinding is also determined. A wear model is described which makes it poss...
Metal manufacturing industries have a growing interest in finding economical ways to improve grinding productivity, part quality, and production cost. Our study extensively investigated the effects of the types of grinding wheels, grinding fluids, and the...
... Developed from federally funded research, testing and training programs; updated annually. ... Title : High Speed Abrasive Belt Grinding. ...
A brief summary of the basic principles of free abrasive grinding is presented, and the practice at the LLL Optics Fabrication Shop is described. Data correlations used in the process are presented. (GHT)
This program shows how to true the grinding wheel, load and operate the magnetic chunk, rough-grind the discs, finish-grind the discs to precision measurements, and check for accuracy and parallelism.
The program shows how to true the grinding wheel, load and operate the magnetic chuck, rough-grind the discs, finish-grind the discs to precision measurements, and check for accuracy and parallelism.
... Abstract : Understanding grinding technology using a diamond grinding wheel is very ... Because Si3N4 is very difficult to grind, its grindability, which ...
... Abstract : A lubricating and cooling fluid for the abrasive working of metals ... Descriptors : *GRINDING, *CUTTING FLUIDS, USSR, CORROSION ...
Laboratory grinding apparatus is described and it is concluded that coke is likely to be contaminated by iron from the abrasive action of coke on rubbing surfaces.
Gamma-TiAl is an ordered intermetallic compound characterized by high strength to density ratio, good oxidation resistance, and good creep properties at elevated temperatures. However, it is intrinsically brittle at room temperature. This thesis investigates the potential for the use of grinding to process TiAl into useful shapes. Grinding is far from ...
Grinding is the final process of machining a rail. Conventionally, the rail�s surfaces are ground by a single-wheel grinder. The vibrations caused by the grinding process can greatly influence the final surface roughness and dimensional accuracy of the rail. This research investigates performance achieved by using two ...
In this study, a new technique of in-process evaluation of a grinding wheel surface is proposed. Some specific wheel surfaces are prepared as references by the appropriate truing and/or dressing procedure, and grinding sounds generated by these wheels are discriminated by analyzing the dynamic ...
The relationship between two significantly different surface grinding conditions and the reciprocating ball-on-flat friction and wear behavior of a high-quality, structural silicon nitride material (GS-44) was investigated. The slider materials were silicon nitride NBD 200 and 440C stainless steel. Two machining conditions were selected based on extensive machining and ...
A survey of abrasion resistant materials is presented. Sections are included on abrasion-resistant cast steels, abrasion-resistant wrought steels, alloy white irons, composite abrasion-resistant castings, grinding media, and development prospects. (JRD)
With the aid of the electron microscope, a model system of pure hot pressed alumina was used to study the effect of temperature on the transverse strength and type of fracture in polycrystalline material. The type of fracture depends upon the relationship of crystalline to intercrystalline bond strengths, in particular, and it was found that these strengths were equal in hot pressed ...
wheel) as the wheel rolls over the surface of Mars. .... wheel is shown in figure 5. A recent picture of the microrover during assembly ...
... Regarding the surface finishing project, a unified mathematical theory for the process of material removal by abrasion (grinding and polishing) was ...
Deterministic microgrinding (DMG) of optical glasses and ceramics is the commercial manufacturing process of choice to shape glass surfaces prior to final finishing. This process employs rigid bound matrix diamond tooling resulting in surface roughness values of 3-5?m peak to valley and 100-400nm rms, as well as mid-spatial frequency tool marks that require subsequent removal in secondary ...
Attempts to use diamond or CBN grinding wheels for full cut or deep cutting processes in the machining of hard materials, were initially limited to grinding wheels coated by electrodeposition. The tool body was provided with the required profile and the d...
A grinding wheel system includes a grinding wheel with at least one embedded sensor. The system also includes an adapter disk containing electronics that process signals produced by each embedded sensor and that transmits sensor information to a data processing platform for further processing of the transmitted ...
DOEpatents
We are collaborating with the Center for Optics Manufacturing (Rochester NY) to develop fine diamond grinding wheels for spherical grinding of glass optics. A standardized method for evaluating wheel performance includes in-process acoustic emission (AE)....
Aim of this research program is to establish the effect of mill size and batch or continuous operation on the role of corrosive and abrasive wear during mineral grinding operations. Grinding ball wear tests are being conducted on the laboratory, pilot pla...
Combined with the grinding principle, it is put forward that friction coefficient changes with the change of grinding parameter; and the grinding force model of single abrasive grain is developed based on friction coefficients of different grinding conditions. Following the theory of variable ...
... high efficiency and quality has been expected by the employment of tough metal bonded superabrasive wheels and rigid grinding machines. ...
... The techniques developed combine the inherent dimensional accuracy of diamond wheel vertical grinding with numerical control techniques ...
Apr 15, 1998 ... Sojourner rover showing Lewis' wheel abrasion experiment. ... These tests created wear conditions more severe than simple rolling. ...
Mechanical grinding of artificial diamond grinding wheel was traditional wheel dressing process. The rotate speed and infeed depth of tool wheel were main technics parameters. The suitable technics parameters of metals-bonded diamond grinding wheel and ...
... ADD815247. Title : In-Process Detection of Grinding Wheel Truing and Dressing Conditions Using a Flapper Nozzle Arrangement. ...
... Abstract : The application of high peripheral speeds with diamond and CBN wheels is unleashing new grinding performance potentials. ...
... Accession Number : ADD324856. Title : GRINDING WHEEL CRACK DETECTOR AND METHOD - PATENT 4,674,235. Corporate Author : ...
... Accession Number : ADD255288. Title : Efficient Grinding of Ce-TZP With SiC Wheels. Descriptive Note : Journal article,. ...
... Accession Number : ADD811653. Title : Diamond Wheels Grind Diamond Tools. Descriptive Note : Journal article,. Corporate Author : ...
... Accession Number : ADD122698. Title : Comparison of Wheel Types used in Snag Grinding of Stainless Steels,. Corporate Author : ...
Title: IMAGING OF GRINDING WHEELS. Description: IMAGING OF GRINDING WHEELS. ID: C-1997-01574. Credit: NASA Glenn Research Center (NASA-GRC) ...
The overall objective of this project is to develop sensor-integrated ``intelligent`` diamond wheels for grinding of ceramics. Such wheels will be ``smart`` enough to monitor and supervise both the wheel preparation and grinding processes without the need to instrument the machine tool. ...
Demonstrates the rough grinding of spherical surfaces by the curvature generator process. Illustrates the theory, function, and operation of the curve generating diamond-grinding wheel.
Shows how to mount and dress wheels on the 2-spindle grinder, prepare the diaphragm chuck, plunge-grind the bore and adjust for taper, and grind the shoulder and flange parallel and at right angles to the bore.
This study investigates the mechanics of creep feed grinding of structural ceramics with particular emphasis on the integrity of the finished surface. A fractional factorial experiment of 2{sup 5} conditions was used to determine the effects of grinding wheel bond (resinoid and vitreous), grit size (80 and 180), grit concentration (50 ...
The hardened alpha-case (alpha-case) layer inevitably forms on the surface of titanium castings when prepared by investment casting. Because the hardness of the alpha-case is incomparable to that of the interior structure, the perception exists that the alpha-case is difficult to remove during cutting, grinding and polishing. Grindability (ease of ...
A technological basis for efficient ceramic machining requires a fundamental understanding of the prevailing grinding mechanisms. Most past research on grinding mechanisms for ceramics has followed either the "indentation fracture mechanics" approach or the "machining" approach. The indentation fracture mechanics approach likens ...
Abrasive grains such as boron carbide, silicon carbide, alumina, diamond, cubic boron nitride, and mullite are combined with a cement primarily comprised of zinc oxide and a reactive liquid setting agent and solidified into abrasive grinding tools. Such grinding tools are particularly suitable for ...
This bibliography contains citations of selected patents concerning Sol-Gel processes and Sol-Gel derived materials and products. Selected patents include Sol-Gel compositions, ceramic and refractory materials, fabrication of silica glass, cataylsts and catalyst supports, nuclear fuels preparation, abrasives for grinding wheels, ...
...2010-07-01 2010-07-01 false Abrasive wheels. 1915.134 Section 1915...Related Equipment § 1915.134 Abrasive wheels. This section shall apply... (a) Floor stand and bench mounted abrasive wheels used for external...
The Wheel Abrasion Experiment (WAE) will assess wheel wear (D. Ferguson and J. ... the test wheel alone is spun and allowed to dig into the martian surface. ...
A series of alloy white irons and Co-base superalloys are being tested for low-stress abrasion resistance in a rubber-wheel abrasion test (RWAT) and for gouging wear resistance in a grinding wheel test (GWAT). The objective of the tests is to establish general relations for the improvement of ...
Standard procedures have been developed for low-stress abrasion testing, based on a rubber wheel test system, and for gouging abrasion testing, based on a grinding wheel test system. AISI 1020 and 4340 steels have been evaluated as test standards for both systems, and the 1020 has been found to ...
The fact that the grinding wheel produces a unique image on the workpiece is utilized in a very simple way to obtain reproducible results and information regarding the grinding wheel topography and therefore the grinding action. This method makes it possible to monitor changes that occur in the ...
The present paper presents the analysis of surface topography of gear teeth as the result of final machining processes. Teeth of multiple cylindrical gears shaped by grinding were smoothed in abrasive mass, honed or shot peened. The measurement of gears were made using coordinate measuring machine and 3D surface topography stylus instrument. The following ...
An automatic polisher and techniques for producing scratch-free polished surfuces on pyrolytic graphite specimens in about 15 min after mounting are described. The polisher consists of a two-part polishing well and a stationary cross frame holding bearings. The frame is posltioned so that the weighted mounted specimens are polished by simultaneous rotation against the bearings and ...
The overall objective of this project is to develop sensor-integrated 'intelligent' diamond wheels for grinding ceramics. Such wheels will be 'smart' enough to monitor and supervise both the wheel preparation and grinding processes without the need to ins...
... MACHINING, *MANUFACTURING, GRINDING, SILICON NITRIDES, SINTERING, POLYCRYSTALLINE, DIAMOND WHEELS, END MILLING ...
...Eye protection when operating grinding wheels. 57.15014 Section 57.15014...Eye protection when operating grinding wheels. Face shields or goggles in good...shall be worn when operating a grinding wheel. [53 FR 32533, Aug. 25,...
...Eye protection when operating grinding wheels. 56.15014 Section 56.15014...Eye protection when operating grinding wheels. Face shields or goggles in good...shall be worn when operating a grinding wheel. [53 FR 32526, Aug. 25,...
Diamond-spark erosion grinding on metallic bond is a highly productive process used in working difficult materials. It is of considerable interest to investigate the efficiency of diamond wheels in the grinding of hard alloys while supplying impulse energ...
Electrochemical form grinding cutting tests were performed on 25 17-4 PH stainless steel bars by a copper resin aluminum oxide wheel formed from a diamond form block. Tests investigated methods of dressing a form into a grinding wheel, nozzle design, opti...
The effect of a driven rotary steel dressing device on the subsequent performance of a resin bonded diamond grinding wheel, used to grind silicon nitride ceramics, is described. The influence of increasing dressing parameters such as speed ratio and dress...
... WORDS (Continue on reverse side It necesary and Identify by block number) High Speed Abrasive Belt Grinding Coated Abrasives Contact Aheel ...
... Accession Number : ADD139091. Title : Alternating-Current Electrochemically Assisted Abrasive Grinding of Niobium Alloy Nbts,. ...
abrasive polishing, chemical assisted polishing, or grinding. ... To compare the capability of the grinding machine equipped with each of the two spindles, ...
... 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 ...
NASA Lewis Research Center's Wheel Abrasion Experiment (WAE) will measure the amount of wear on wheel surfaces of the Mars Pathfinder rover. WAE uses thin films of Al, Ni, and Pt (ranging in thickness from 200 to 1000 angstroms) deposited on black, anodiz...
Micro aspherical glass lenses are required for electronic devices, optical devices and advanced optical fiber transmission equipments. The glass lenses are manufactured by glass molding method by using micro ceramics dies such as tungsten carbide or silicon carbide (1). Therefore molding dies are most important and they were ground by ultra-precision grinding method with ...
A demonstration was performed for decontaminating a radioactivity contaminated concrete pad with a portable abrasive blasting system. The system utilizes a rotating blast wheel that scours the concrete surface with metal abrasive. The metal abrasive, pulv...
The relative contributions of abrasion and corrosion and the effect of scale-up on the wear rates of three different grind materials in molybdenite and taconite ore milling under three mill atmospheres was investigated. A standardized marked ball wear tes...
A brief summary of the basic principles of free abrasive grinding is presented along with a description of the practice at the LLL optics fabrication shop. Complete data on the process are almost nonexistent. The data correlations used at LLL are presente...
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...
We have developed an empirical correlation between rock abrasion tool (RAT) grind energy and compressive strength. This correlation can be used to infer the physical properties of rocks ground by the MER rovers on Mars.
A cost analysis of the use of Borazon for grinding steel and sintered carbides is given. The hardness of this abrasive lies between that of diamond and boron carbide and, as a result of its chemical behavior in regard to elements with a carbon affinity, i...
The volume theory of ball wear ascribes ball consumption in grinding mills only to impactive wear, whereas the surface theory ascribes it only to abrasive wear, and ball-wear data are often in good agreement with either or both of these theories. In this ...
The machines described are a grinding machine, model W-014, especially designed for grinding hard materials, such as glass, sapphire, ceramic or silicon parts clamped in packs, with diamond wheels, and a copy grinding machine, model W-018, for facetting o...
It is the thesis of this paper that shear mode grinding (SMG), (ductile grinding, nanogrinding, fractureless grinding) is just a particular form of polishing. It may be unique in that it can involve a hard wheel of very precise dimensions compared to the ...
Four different strategies for robotic grinding are presented and experimentally verified. The strategies are based on measurements of the contract force between the grinding wheel and the workpiece, in order to control the grinding process. In light of gr...
Techniques used in grinding UO/sub 2/ are described, and results of experiments which indicate the importance of grinding wheel selection and maintenance are given. Design of a plant for grinding is included. (J.R.D.)
... Stationary grinding machines; protective devices... Stationary grinding machines; protective devices. (a) Stationary grinding machines other than special bit...wheel. (2) Adjustable tool rests set as close as...
...false Stationary grinding machines. 57.14115 Section...14115 Stationary grinding machines. Stationary grinding machines, other than special bit grinders...wheel; (b) Adjustable tool rests set so that the...
...false Stationary grinding machines. 56.14115 Section...14115 Stationary grinding machines. Stationary grinding machines, other than special bit grinders...wheel; (b) Adjustable tool rests set so that the...
We are collaborating with the Center for Optics Manufacturing (Rochester NY) to develop fine diamond grinding wheels for spherical grinding of glass optics. A standardized method for evaluating wheel performance includes in-process acoustic emission (AE). This paper includes recent AE measurements taken during the ...
... SLURRIES, *GRINDING, ABRASIVES, HIGH RATE, SURFACES, AREA COVERAGE, HYDRODYNAMICS, BONDED JOINTS, ANGLE OF ATTACK ...
... METAL POWDERS BY BALL MILLING WITH GRINDING AIDS. ... Descriptors : *BALL MILLS, *POWDER METALS, ABRASIVES, CHLORIDES ...
... rms by ITT Industries. Loose- abrasive grinding and polishing were performed by the Mirror Lab. We polished the mirror ...
This is the third semi-annual report for the project. The overall objective of this project is to develop sensor-integrated intelligent diamond wheels for grinding of ceramics. Such wheels will be smart enough to monitor and supervise both the wheel preparation and grinding processes without ...
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 ...
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...
The relationship between grinding forces and the material`s resistance to microfracture is investigated in abrasive machining of silicon nitride ceramics. Surface grinding is performed on two forms of silicon nitride with different microstructures, and the grinding forces are measured. In addition, single-point ...
The effects of slurry rheological properties on the erosive wear of grinding media and grinding efficiency (percent minus 325 mesh) have been studied in a laboratory ball mill using minus 10 mesh quartzite. A laboratory procedure was also utilized to eval...
The grinding of high-alumina ceramics involves specific problems as the effectiveness of the grinding is affected by the rate of material removal to ensure high productivity, the surface roughness, and the wear of the diamond tool. This study of the cutting processes in cylindrical and internal grinding was done to determine the ...
... the taber abrasion test, CS- 10F abrasion test wheels were ... Sand used for sand blast testing was silica ... Two samples were tested at the same time. ...
The effect of various surface treatments on the roomtemperature modulus of rupture and impact strength of a nickel-bonded titanium carbide cermet was investigated. The average strengths for the treatments varied from about 200,000 to 80,000 lb/in/sup 2/ in modulus of rupture, and about 3.5 to 1 in.-lb in impact resistance. The strengths of lapped, grit-blasted, diamond-ground, or vapor- ...
This work sought to improve the communication between users and makers of fine diamond grinding wheels. A promising avenue for this is to formulate a voluntary product standard that comprises performance indicators that bridge the gap between specific user requirements and the details of wheel formulations. We propose a set of ...
... diamond grinds was significantly weaker than that ground with "fine" diamonds grains. "Coarse" diamond grains in the grinding wheel resulted in ...
... in achieving the full potential of CNC automation for thread grinding is the ability of the diamond roll to contour-dress wheel forms, accurately and ...
... of these applications were developed through the efforts of Kapp, a manufacturer of CBN-plated wheels and CNC profile grinding machines up ...
The wheels on grinding machines used for cylindri- cal (outer and inner) surface , centerless, and tool and cutter grinding must be dressed repeatedly to ...
selection and use of diamond stones for cutting and dressing grinding wheels. This manual is a compilation of empirical data and incorporates an original ...
The wheels on grinding machines used for cylindrical outer and inner surfaces, and tool and cutter grinding, must be dressed repeatedly to ...
... Abstract : Machining ceramics with diamond grinding wheels has been slow and costly and not very flexible, requiring a lot of process ingenuity. ...
... Accession Number : ADD801153. Title : High Performance Grinding With CBN (Cubic Boron Nitride) Wheels. Descriptive Note : Conference paper,. ...
In a grinding disc reinforcement fibres of high strength are used and such fibres or normal glass fibres are covered with a protective coating including fine grain.
US Patent & Trademark Office Database
The program shows how to mount and true a grinding wheel, position the diamond tool, operate a magnetic chuck, and use a grinder.
Shows how to mount and true a grinding wheel, position the diamond tool, operate a magnetic chuck, and use a grinder.
Manual of industrial diamonds plus dressing and grinding criteria for ... and use of diamond hide. stones for cutting and dressing grinding wheels. ...
... form grinding cutting tests were performed on 25 17-4 PH stainless steel bars by a copper resin aluminum oxide wheel formed from a diamond form ...
... high overall removal rates while at the same time providing high strength in final ground product. Grinding wheels with different diamond grit sizes ...
of the grinding wheel is accomplished by a diamond coated rotary disk mounted on the spindle. This rotary dressing tool/spindle assembly is attached ...
In this paper, we describe the formation mechanism of a finished surface in ultrahigh-speed grinding under a peripheral wheel speed higher than 200m/s. Grinding experiments using a grinding machine tool equipped with an active magnetic bearing spindle have been conducted over a range of ...
Each of the twin 2003 Mars Exploration Rovers will be equipped with a Rock Abrasion Tool (RAT) designed and tested by Honeybee Robotics. The RAT is a robotic grinding tool and science instrument about the size of a soda can and weighing less than 690 grams that is carried by the robotic arm or Instrument Deployment Device (IDD) of the rover. The primary ...
...wooden mallet for heavier wheels. If they sound cracked (dead), they shall not be used...applying the ring test, otherwise the sound will be deadened. It should also be noted...the wheel 45° and repeat the test. A sound and undamaged wheel will give a clear...
Code of Federal Regulations, 2011
A grinding method which uses specific metallic bond fine grit wheels and electrolytic in- process dressing (ELID) is proposed for the effectual mirror surface grinding of brittle materials. Significant results such as high ground surface quality and ultraprecision grinding have been achieved through the use of this ...
To clarify the wheel wear characteristics in grinding process using vitrified cBN wheels, we have investigated the change in wheel wear behavior when the load on the grain cutting edge is increased by increasing work speed. Wheel wear behavior in the grinding process may be ...
The overall objective of this project is to develop sensor-integrated `intelligent` diamond wheels for grinding ceramics. Such wheels will be `smart` enough to monitor and supervise both the wheel preparation and grinding processes without the need to instrument the machine tool. Intelligent ...
Cylindrical wire EDM profile truing of the metal bond diamond wheel for precision form grinding of ceramics is presented in this report. First a corrosion-resistant, precise spindle with the high-electrical current capability for wire EDM truing of grinding wheel was fabricated. An arc profile was adopted in order ...
We introduce the method of precisely grinding of axis-symmetric aspherical glass-molding dies by using a diamond wheel. Those show how to select vertical-grinding or slant-grinding, how to grind molds with high accuracy and actual grinding results.
Milling Cutter. Grinding Wheels. Wheels. Rock Sample. Gears. FIGURE 1. FIGURE 2. There is a need in geological sampling for an ap- ...
... secured within a metallic matrix onto the outer rim of a grinding wheel. More specifically, hard particles such as particles of diamonds and cubic ...
... Accession Number : ADD808586. Title : Influence of Wheel Speed on Surface Finish and Chip Geometry in Precision Contour Grinding. ...
... wheels, known as Electrolytic In-Process Dressing (ELID) has ... wheel that is electrolytically dressed, during the ... paper as will its application for rough ...
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
Sojourner rover showing Lewis' wheel abrasion experiment. The Mars Pathfinder spacecraft soft-landed on Mars on July 4, 1997. Among the many experiments on its small Sojourner rover are three technology experiments from the NASA Lewis Research Center, inc...
The Wheel Abrasion Experiment (WAE) gathered soil abrasion information by observing a special rover wheel wear. ... Tests and calculations confirmed the possiblity that the rover would accumulate a large static charge during its surface ...
16 Commercial Practices 2 2009-01-01 2009-01-01 false Reflectorized Bicycle Wheel Rim Abrasion Test...
electrolysis test, the surface of the wheel was chemically etched with a three part solution of distilled water typically, as the diamonds wear out, the grinding process becomes progressively less efficient. Worn- ing grinding wheel efficiency by removing bond material and exposing new, sharp diamonds. Dressing
E-print Network
This work sought to improve the communication between users and makers of fine diamond grinding wheels. A promising avenue for this is to formulate a voluntary product standard that comprises performance indicators that bridge the gap between specific use...
Among various types of engineering ceramics, silicon nitride excels in mechanical strength under high temperature. However, this material is too hard and too brittle to grind with a conventional diamond wheel. In order to overcome this difficulty, Toshiba...
Wheel-work contact is a concept central to the study of grindability of materials and thermal damage in grinding. A new experimental method, based on the use of a split workpiece carrying an electric potential but separated by a thin layer (less than 80 m...
Boron nitride grinding tools can be used to advantage for the grinding of high speed steel (HSS) with a high vanadium content. the abrasives available to date are of limited value because the HSS materials contain very hard carbides, grinding of which, an...
A remotely operable grinding apparatus particularly adapted for abrasively removing a portion of a structure underwater is described comprising a baseplate, a motor means having an output shaft, a grinding head operatively connected to the output shaft, a housing for isolating the motor means from ambient water, guide means slidably ...
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... the spiders from abrasion by center ...
... LEAKAGE BEFORE MECHANICAL TREATMENT, ABRASIVE-WHEEL TREATMENT TO SURFACE FINISH, HELIUM LEAK-TEST CHECK FOR ...
... Accession Number : ADD258347. Title : Application of Silicon Carbide Fibers for Increasing the Service Parameters of Abrasive Cutting Wheels. ...
... Title : A High-Alumina Ramming Mixture With Partial Replacement of Electrofused Corundum With Crushed Grinding Wheels. ...
