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Payment details. Payment methods. Special financing available. Select PayPal Credit at checkout to have the option to pay over time. Thread Grinding Wheels. Toolroom Grinding Wheels. Surface Grinding Wheels. Segmented Grinding Wheels. Cylindrical Grinding Wheels. Centerless Grinding Wheels. Creepfeed Grinding Wheels. See the full Thread Grinding Wheels range. The molded in depressions can be of any size or shape but should be at least about 0.
While solid lugs protruding from the mating surface of the driving plate are preferred, the lugs may take the form of tabs, two to a lug, which will match the depressions in the wheel. However, the invention wheel need not be made up of two sections or zones as above described. Rather it may be uniform in composition throughout its thickness. Useable abrasive particles with a Mohs hardness of at least 8 bonded with the same material, vitrified or organic polymer based, may be used throughout the thickness of the wheel so that the aforementioned molded-in nuts and depressions are surrounded by relatively coarse grit useable abrasive grain.
The obvious disadvantage to this embodiment of the invention, is the wasting of premium priced abrasive in the non-useable upper side section of the wheel, in which the nuts and depressions are located. Any abrasive grain can be employed in the lower or grinding section or the entire thickness of the wheel in the case where the composition of the wheel is uniform throughout so long as it has a Mohs hardness of at least 8, as pointed out above. However, the preferred abrasive is one selected from the group consisting of silicon carbide, fused alumina, cofused alumina-zirconia, sintered alumina such as that described in U.
The abrasive grain can have a particle size of from to microns. The bond for the abrasive grain may be any vitrified bond or any organic polymer based bond such as phenol-formaldehyde, polyester, epoxy, urethane, polybenzimidazole and the like. The bonds may also include any of the fillers and grinding aids known in the art that are amendable with the two types of bonds. The upper section, if there is one, can be made up of any of a large number of particulate materials so long as they are less abrasive or finer in particle size than the abrasive grain in the lower section of the grinding wheel, including glass fibers, organic fibers, crushed nut shells, hard wood chips, and mixtures of these materials where the bond therefor is an organic polymer bond.
Also suitable are metal powders such as steel, iron, copper, aluminum and mixtures thereof. When the bond is of the vitrified type the preferred particulate material for the upper section is kyanite, wollastonite, mullite, garnet, quartz, fluorite, mica, nephaline syenite, barium sulfate, calcium carbonate, and of course any mixture or combination of these materials as well as finely particulate abrasive grain.
Obviously, these particulate materials may be utilized with organic polymer based bonds as well. The average particle of this material in the upper section 12 may be from 44 to microns. The lower section 4 was composed of abrasive grain having an average particle size of microns, barium sulfate filler, quick lime, furfuraldehyde plasticizer and a cured phenol formaldehyde resin.
The upper section 6 was made up of the same materials as the lower section 4 except that the abrasive grain in the lower section 4 was replaced by micron kyanite and 80 micron wollastonite particles. The details of composition of both upper and lower sections are given below. Still referring to FIGS. Such a wheel 2 required the specially designed driving means 14 with a driving or mounting plate 18 attached to a spindle 20 which in turn was attached to a grinding machine which is not shown.
Through holes in the driving plate 18 passed bolts 16 which were screwed into threaded nuts 12 located in the upper section 6 of the wheel 2. The driving plate 18 included on its under surface, lugs or bosses which were essentially the same configuration as the indentations or depressions 22 in the upper section 6 of the wheel 2 which mated when the driving plate 18 was bolted to the upper section 6 of the wheel 2.
A railroad track grinding wheel, according to the most preferred embodiment of the invention, having an outside diameter of The mix, on a weight percent basis, was made up of The resulting approximately 7. The special top mold plate was special in two respects. Proper steps in mounting a grinding wheel are as follows: Handle and store grinding wheels in a careful manner. Handle and store all grinding wheels as if they were made of glass! Select the proper grinding wheel and machine for the job.
Lock out and tag all machines before working on them. Disconnect portable machines from their power source before changing the grinding wheel. Visually inspect all grinding wheels.
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