Abrasive cutting-off wheels

Abrasive wet cutting, using metal or bakelite abrasive cut-off wheels impregnated with alumina, boron nitride, silicon carbide, or diamond, is most appropriate and gives rise to minimum deformation of the cut surface. Wheels may be distinguished as hard or soft depending on their ability to retain or discard the abrasive particles. In general, the harder (more difficult to cut) materials require softer wheels because these provide a continuous supply of new abrasive particles to the surface (but at the same time wear away more quickly). 

Hood and enclosure design, (i) (A) It is the dual function of grinding and abrasive cutting-off wheel hoods to protect the operator from the hazards of bursting wheels as well as to provide a means for the removal of dust and dirt generated. All hoods shall be not less in structural strength than specified in the American National Standard Safety Code for the Use, Care, and Protection of Abrasive Wheels, B7.1-1970. 

Grinding wheel or abrasive cut off operation. Dust abrasive. 

Wet sectioning usually involves the use of machines and diamond cut-off wheels operating by the plunge cutting method. The abrasive layer is found along the circumference of the disk (see Fig. 1). The feed motion proceeds in a radial direction. A sufficient quantity of cutting fluid must be supplied to the proper location during... 

In addition to the specifications pertaining to the abrasive layer, the diameter and thickness of the wheels are also critically important to the sectioning operation. The rotational speed, which affects cutting performance, is determined by the wheel diameter and the arbor speed of the machine. For purposes of reliability and directional stability, one third of the cut-off wheel diameter should be enclosed by the flange. The width of the kerf and the cutting loss are determined by the thickness of the cut-off wheel. 

When selecting the sectioning blades, it is important to consider the specifications pertaining to the abrasive layer and the dimensions of the cut-off wheel. The type of... 

This is the last station where a flying cut-off saw is installed. The saw action can be synchronized with the puller movement so that sections of required lengths are cut automatically. The saw usually consists of an abrasive or a continuous rim diamond wheel. A coolant spray is sometimes employed to cool the cut-off wheel as well as to minimize dust. 

Rubber. Both natural and synthetic rubber are used as bonding agents for abrasive wheels. Rubber-bond wheels are ideal for thin cut-off and slicing wheels and centerless grinding feed wheels. They are more flexible and more water-resistant than resinoid wheels. 

Dicing Blades Dicing blades with a thickness between 10 pm and 1 mm are used for precision cut-off grinding. Dicing blades consist of abrasive grains of sizes from 1 pm to 46 pm, a metal bond (sintered or electroplated), and have a wheel diameter of 50-60 mm (Lee et al. 2005). 

A reactor was prepared for maintenance and washed out. No welding needed to be done, and no entry was required, so it was decided not to slip-plate off the reactor but to rely on valve isolations. Some flammable vapor leaked through the closed valves into the reactor and was ignited by a high-speed abrasive wheel, which was being used to cut through one of the pipelines attached to the vessel. The reactor head was blown off and killed two men. It was estimated that 7 kg of hydrocarbon vapor could have caused the explosion. 

Powered abrasive grinding, cutting, polishing, and wire buffing wheels create special safety problems because they may throw off flying fragments. 

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