Patent GB-1124212-A (GB)
Title: Roll grinding apparatus and alignment method
IPC: B24B49/00
Filed: 1965-09-03
Abstract: 1,124,212. Grinding. FARREL CORP. 3 Sept., 1965 [17 Nov., 1964], No. 37746/65. Heading B3D. A method of aligning the axis of a mill roll on a grinding machine with the path of travel of the grinding wheel carriage comprises supporting the roll on spaced apart journal rests, aligning one side of the roll face with the path of travel, gauging the diameter at one end and then the other of the roll, noting the difference, and moving one  end of the roll a distance proportional to the noted difference. In apparatus for carrying out the method, a carriage 14, Fig. 1, carrying the grinding wheel 27 and gauging means is movable along ways 12, 13 parallel to ways 19, 20 for supports 17, 18 for the neck portions 16 of the mill roll K. The roll is chucked to a headstock 23, and the support 18 is adjustable transversely of the axis of the roll by a motor MN which through gearing and levers rocks an arm 85, Fig. 6, having a bearing block 88 about a pivot 86 on a part 84 having a second bearing block 87. The grinding wheel carriage 14 is movable along the ways 12, 13 by a motor-driven worm engaging a rack on the bed of the machine, and a slide is movable on the carriage transversely of the axis of the roll by a nut and lead screw mechanism. The slide has a pivot about which the grinding head is movable during crowning of the roll by mechanism as described in Specification 1,001,842. A roll measuring and gauging means is mounted on the carriage and consists of a structure 100, Fig. 11, having a track 101 along which a pair of members 104 are movable by lead screws 109, 110 driven from motors 113, 114. The lead screws are coupled to encoders 115, 116 which emit signals proportional to the distances of the members from a centre position 117. Each member carries an arm 102, 103, and each arm has, at its end, a gauging head 118 consisting of a linear variable differential transformer and a proximity detector which consists of a coil and is used for positioning the gauge at a determined distance from the ends of the roll. When the arms are moved towards the roll to a position determined by the output from the transformers, the output from the encoders 115, 116 is fed to an adder which indicates the diameter of the roll. In order to align the roll, the grinding wheel may be moved to grind the roll so that it has a surface adjacent the guideways which is parallel thereto. The gauging member is then positioned adjacent one end of the roll and a reading taken and compared with a reading at the other end of the roll, the difference in readings at the comparator being used to control the motor for the support 18, so that the roll is moved until its axis is parallel to the movement of the carriage. The output from the comparator may be supplied during movement of the carriage to a pen recorder which is driven in proportion to the movement of the carriage so as to produce a plot on the recorder corresponding to the contour of the roll. An electric circuit is described which controls the machine so that the gauging of the ends of the roll and the adjustment of the roll so that it is parallel with the travel of the grinding wheel are effected automatically.