Method for the profiling of grinding wheels and apparatus therefor

A method for the profiling of grinding wheels containing at least one of the abrasives diamond and cubic crystalline boron nitride interspersed in a metallic brittle bond which has a graphite content of from 5 to 50 volume per cent, said method comprising the steps of:

• (a) truing a grinding wheel by rolling a profile into the contour surface of said grinding wheel with partial breaking out of the material particles thereof;
• (b) simultaneously strengthening the profile of the contour surfaces by pressing material particles into graphite pockets thereby to produce a precisely defined profile on a surface which is loaded to a considerable degree;
• and
• (c) dressing this profiled contour surface immediately subsequent to the profiling step by means of an abrasive block that continously adapts its shape to the profile whereby particles of material are broken out from the graphite pockets and the resultant profile surface is brought into a condition suitable for further profiling and grinding.

An apparatus for the profiling of grinding wheels which include at least one of the abrasives diamond and cubic crystalline boron nitride interspersed in a metallic brittle bond, said apparatus comprising a stand (8), bearing means (9) disposed in said stand (8), a shaft (4) rotatably mounted in said bearing means (9), a grinding wheel (2) mounted on said shaft (4), guide means (13) extending vertically to said bearing means (9) in stand (8), further bearing means (14) movably disposed in said guide means (13) in the direction toward said bearing means (9), a further shaft (3) in said bearing means (14), pressure means (16) connected with said further bearing means (14) for moving said further bearing means in the direction toward said bearing means (9), further guide means (19) provided at said stand (8) at an angle with respect to said guide means (13) and mainly vertically to said bearing means (9), a carrier arm (20) for supporting an abrasive block (22) in said further guide means (19), further pressure means (21) in said stand (8) and connected with said carrier arm (20) for moving said carrier arm in a direction towards said bearing means (9), a motor a motor (11) for driving one of said shaft (4) and said further shaft (3), and a profiled roller (1) formed of a material which includes steel and tungsten-carbide mounted on said further shaft (3), said abrasive block (22) being mounted on said carrier arm (20), with one of said grinding wheel (2) and said profiled roller (1) which is mounted on said one of said shaft (4) and said further shaft (3) which is driven by said motor (11) being fixedly connected thereto, the other of said grinding wheel (2) and said profiled roller (1) being freely rotatably mounted on the other of said shaft (4) and said further shaft (3).

Apparatus for profiling wheels which include at least one of the abrasives diamond and cubic crystalline boron nitride interspersed in a metallic brittle bond, said apparatus comprising a stand, first bearing means disposed in said stand, a first shaft rotatably mounted in said first bearing means, a grinding wheel mounted on said first shaft, first guide means extending generally perpendicularly to said first bearing means in said, second bearing means movably disposed in said first guide means in a direction toward said first bearing means, a second shaft in said second bearing means, first pressure means connected with said second bearing means for moving said second bearing means in a direction toward said first bearing means, second guide means provided on said stand, carrier arm means operatively associated with said second guide means for supporting an abrasive block, an abrasive block mounted on said carrier arm means, second pressure means on said stand connected with said carrier arm means for moving said carrier arm means in a direction toward said first bearing means, a motor for driving one of said first and said second shafts, and a profiled roller formed of a material suitable for rolling a profile into a contour surface of said grinding wheel, said profiled roller being mounted on said second shaft, with one of said grinding wheel and said profiled roller which is mounted on said one of said first and said second shaft driven by said motor being fixedly connected thereto, the other of said grinding wheel and said profiled roller being freely rotatably mounted on the other of said first and said second shaft, said second guide means comprising a rocking lever rotatably arranged on said stand, said carrier arm means for said abrasive block being attached to a free end of said rocking lever which is pivotable essentially radially with respect to said first bearing means and which is actuated by said second pressure means, with release means being associated with said second pressure means for lifting said abrasive block off said grinding wheel.