GB1250637A - - Google Patents

Abstract

1,250,637. Dressing grinding wheels. LANDIS TOOL CO. 23 Dec., 1968 [26 Dec., 1967], No. 60938/68. Heading B3D. A method of dressing a grinding wheel 27, Fig. 4, comprises the steps of traversing a rotating dressing roller 18 across the peripheral face of the wheel in one direction, stopping the rotation of the roller, and traversing the now stationary roller across the peripheral face in the return direction to perform a finish dressing operation. In a machine described for carrying out the method the roller 18 is mounted on a carriage member 30 for movement across the wheel 27 and the member 30 is carried by a dresser slide 45 for movement of the roller. 18 towards and away from the wheel. The movements are controlled by piston and cylinder devices 32, 33 and 47, 46 respectively and by contact of a follower 50 with a profile bar 51 to move the roller 18 across the wheel and around the comers R1, R2 thereof, Fig. 3. The roller 18 may be driven by a motor or held non-rotatable by a brake acting on the motor shaft. A solenoid SOL 30, Fig. 4, controls actuation of the motor brake, and solenoids SOL 33 and SOL 34 control the flow of a pressure fluid to cylinder 33. In operation of the machine the roller 18 is stationary in a position A, Fig. 3. After a predetermined number of rotations of the wheel 27 have been counted, a contact in a control circuit is closed which causes the solenoid SOL 30 to be energized to release the motor brake and causes the solenoid SOL 33 to be energized to cause movement of the roller 18 from A to B. At B a time relay in the control circuit causes the motor to be energized so that the roller 18 is rotated as it passes across the face of the wheel from B to G, and subsequently around the comer R2 of the wheel to C. When position C is reached a limit switch 30 LS is operated by an abutment member 60 on slide 45 to stop the motor and operate the brake. The roller 18 is then returned to position G with the roller held non-rotatable, and the solenoid SOL 34 is then energized to move the roller 18 across the face of the wheel 27 to position B. At B a limit switch 29 is operated by an abutment 56 carried by the member 30 to cause the brake to be released and the motor to be driven as the roller passes around corner R from B to H. At H the motor is stopped and the brake applied. The roller is then returned to position A. Coolant fluid may be fed between the roller and wheel during dressing. The motor brake may be omitted.