Vitrified bond

Layers of diamond particles in a resin, metal or vitrified bonded tool... 

Multilayered superabrasives can also use the sintering approach or use resinoid and vitrified bonds also (Marinescu et al. 2012). 

Dressing of diamond wheels with diamond dressing tools is stiU limited. A more common method is the use of vitrified bonded silicon carbide rollers either on brake-controlled truing devices or on driven truing spindles (Wegener et al. 2011). During this dressing procedure,... 

A superfinishing abrasive stone is generally vitrified bonded and has a hardness range of HRH20-70. White aluminum oxide, silicon carbide, cubic boron nitride, or diamond abrasive is used. Abrasive sizes in the JIS 300- 500 range are used for coarse finishing, while JIS 600- 1500 abrasives are used for a fine finish (Matsui and Nakasato 1965, Onchi et al. 1995, Varghese et al. 1998). 

The essential function of the bonding system is to hold the abrasive grains on the grinding tool as long as they are sharp, and to release them when they are blunt. The major bond systems are metal-, resin-, and vitrified bonding (Konig and Klocke 2005). 

Date of expiry Organic bonds such as B and BF are subject to deterioration. The date of expiry shall be, at the longest, within 3 years of the date of manufacture. It is expressed as month and year, e.g. 06/2012. This does not apply to vitrified bonds which are not subject to deterioration. 

ELID grinding is more stable than conventional grinding from the removal rate value viewpoint. Material removal rates of 250 mm /min up to 8000 mm /min were reported. The chip thickness is of an order of 1-10 nm. Stock removal rate increases with the increase in the number of passes, stiffness of machine tool, and larger grit sizes of the wheels. Cast-iron-bonded wheels have a larger stock removal rate yet a lower grinding force as compared to a vitrified bonded grinding wheel. 

Factorial experiments of DSG of alumina ceramics with diamond were carried out in the experimental conditions listed in Table 12.1. Before each experiment, the wheels were dressed to a completely restored cutting ability according to the bond type the vitrified bond wheel was dressed mechanically with silicon carbide superfine dressing sticks, whereas the metal bond wheel was predressed using an electrolytic in-process dressing (ELID) technique. 

Homogeneous glasses can be made by admixing the other Components intimately with colloidal silica (749). The chemical reactivity of colloidal silica plays a role in colored or conductive coatings on glass or refractory materials in which a vitrified bond is developed without damaging the substrate (558, 750). 

Because of its fine particle size and high flux content, this clay fuses at a comparatively low temperature to form a greenish-brown glaze suitable for use on stoneware it is also used as a vitrifying bonding material. 

Wheel Grinding. Selection of wheel, wheel speed, and fluid is important. For hard wheel grinding, vitrified bonded wheels are the most effective. Aluminum oxide (AI2O3) wheels give good results when limited to grinding speeds of 10 m/s (2000 sfin) or less. Silicon carbide (SiC) wheels can be used at 20 to 30 m/s (4000 to... 

Modem civilization would not be possible without bonded abrasive products. By the year 1825 sand, emeiy, and even diamond were being bonded together with shellac for use in abrasive sticks and wheels. Rubber bonded wheels were introduced in 1857, the sodium silicate and the vitrified bond just after the Civil War, and the phenolic resin bond in 1923. The metal bond was introduced for diamond wheels in 1940. 

Vitrified bonds are very widely used in the metalworking industry, especially for machinery manufacture. The basis for this glass type bond is a fusible clay, feldspar. Refractory materials and fluxing agents are added to produce the desired composition. The dried clay and other bond ingredients are pulverized, screened, and blended to form the dry bond. This is added to the water wetted abrasive in a mixer to coat each abrasive particle with the bonding medium. The resulting mix is pressed cold in compression molds to form the basic wheel shape. 

The original vitrified bonds tended to have a limited range of firing conditions under which satisfactory product could be made. The current trend is to make bonds from glasses which have a broader firing range and which result in greater uniformity in the product. 

Such adhesives are frequently room temperature curing, not only for simplicity of use but also because the adherends may be of very dissimilar materials such as vitrified bonded abrasive and steel. The product may be used in a wet environment or be exposed to high tem-... 

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