Abstract:
A tool, for dressing both the inside and outside working surfaces of cup-shaped abrasive wheels used for grinding gears, is disclosed along with methods and apparatus for using the tool. The working portion of the dressing tool has a cylindrical shape with an outside surface parallel to its axis of rotation and a top surface extending radially, to the axis of rotation. The apparatus orients the tool relative to the grinding wheel so that only the outer cylindrical surface of the tool is used to dress the inside working surface of the grinding wheel, while only the top surface of the tool is used to dress the outside working surface of the wheel. Formulas are provided for calculating the optimum radius of the cylindrical surface of the tool for providing substantially equal effective relative curvatures between the tool and each of the respective sides of the grinding wheel, thereby resulting in similar grinding characteristics being dressed into both the inside and outside working surfaces of the grinding wheel.
Abstract:
An intricate profile is formed on the peripheral face of the grinding wheel of a surface grinder by moving two rotatable and differently shaped dressing wheels axially and sequentially across the face of the grinding wheel while shifting the grinding wheel vertically in timed relation with such movement to control the depth of cut of the dressing wheels into the grinding wheel. The dressing wheels are movable with the crossfeed carriage of the grinder while vertical movement of the grinding wheel during the dressing operation is effected by way of the wheelhead of the grinder. Both motions are controlled during the dressing operation by a computerized numerical control.
Abstract:
A dresser for roughening the surface of an abrasive wheel has a cutter means for rotation in contact with the abrasive wheel. The cutter means includes a plurality of cutter teeth mounted on a cutter shaft. Ball bearings at each end of the cutter shaft permit the cutter means to rotate freely when held against an abrasive wheel as the wheel is rotated. A pair of hexagonal bearing supports each define a bearing receiving recess for receiving the ball bearings mounted at each end of the cutter shaft. Each of the bearing supports also defines a threaded, bolt receiving opening. A dresser body defines a cavity receiving the cutter unit and slots on opposite sides of the cavity receiving the bearing supports. The dresser body has bolt holes extending from the exterior of the body into the cavity through each of the slots. The dresser body includes a dresser handle which permits the dresser to be manipulated manually. Cutter supporting bolts extend from the exterior of the dresser body through the bolt holes into the cavity and engage the threaded bolt receiving openings in the bearing supports. A pair of locating ridges on the exterior of the body extend parallel to the cutter shaft, permitting accurate location of the dresser on an abrasive wheel tool rest with respect to the abrasive wheel. In an alternative embodiment, a dresser mounting plate is pivotally attached to the dresser body and, further, pivotally attached to the abrasive wheel tool rest, such that the dresser may be quickly pivoted into position for dressing the abrasive wheel.
Abstract:
A dressing apparatus for simultaneously dressing two peripheral portions of a grinding wheel includes two cup shaped dressing wheels, each having the end face thereof embedded with diamond particles for respectively dressing each of the peripheral portions of the grinding wheel through movement in a direction parallel to a tangent of the grinding wheel. One end portion of one of the cup shaped dressing wheels is arranged to extend into the bore of the other cup shaped dressing wheel.