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    • 25. 发明授权
    • Abrasive wheel
    • 砂轮
    • US4977709A
    • 1990-12-18
    • US354414
    • 1989-05-19
    • Jan Siden
    • Jan Siden
    • B24B3/33B24B19/26B24D5/02B24D7/18
    • B24D5/02B24B19/26B24B3/33B24D7/18
    • An abrasive wheel for grinding the cutting pins of a button-type drilling bit in a grinding machine of the kind provided with a rotatable holder for fixating the pins of the bit in a grinding position and for rotating thus fixated pins. The machine also includes a spindle on which the abrasive wheel can be mounted in a given position. The spindle/holder is linearly movable in a plane which extends through and is contained by the respective rotational axes of the holder and the spindle and in a direction parallel with the rotational axis of the spindle. The abrasive wheel includes circular flange parts which embrace a profiled groove therebetween. To enable cutting pins to be ground to an obtuse tip-profiled shape with the aid of such an abrasive wheel, the profiled groove, when seen in cross-section, is formed symmetrically around a line which intersects the rotational axis of the abrasive wheel at an angle whose complementary angle is equal to the angle of inclination of the spindle. The inward part of the profiled groove is widened symmetrically in relation to a predetermined transverse measurement and presents at least the same widening along the whole of it cross-section, upto the location of an outer limiting line, where the groove has a width or a breadth which is greater than the diameter of the pin for which the abrasive wheel is intended.
    • 26. 发明授权
    • Method of contouring the recording surface of a magnetic head transducer
    • 对磁头换能器的记录表面进行轮廓化的方法
    • US4279623A
    • 1981-07-21
    • US045351
    • 1979-06-04
    • John Bealle
    • John Bealle
    • B24B19/26G11B5/187B24B1/00B24B13/00
    • B24B19/26G11B5/1871Y10T29/49998
    • A method of contouring a recording and/or playback surface of a magnetic head transducer to form a precisely contoured surface having a one inch radius of curvature along its major axis is described. The head is secured to a flat surface of a cone-shaped holder and the holder and head are placed within a hemispherical transfer block having a concave surface with a one inch radius of curvature so that the recording surface is in abutting relationship with the concave surface. The holder and head are then placed in a rotatable hemispherical grinding apparatus having a concave grinding surface with a one inch radius of curvature so that the recording surface of the head is disposed in abutting relationship with the concave surface of the grinding tool and is ground to the desired one inch radius of curvature. To further refine the contour of the recording surface, the holder and head are then transferred to a hemispherical polishing apparatus with a concave polishing surface having a one inch radius of curvature and the head is polished to remove irregularities on the recording surface. This method of shaping the recording surface of a head transducer yields uniformly contoured surfaces for large quantities of magnetic head transducers and provides high performance heads which are suitable for high density digital and video recording systems wherein close tolerances are desired.
    • 描述了一种使磁头换能器的记录和/或播放表面成像的方法,以形成具有沿其长轴具有一英寸半径的精确轮廓的表面。 头部被固定到锥形保持器的平坦表面上,并且保持器和头部被放置在具有一个英寸半径曲率的凹面的半球形传送块内,使得记录表面与凹面 。 然后将保持器和头部放置在具有凹形研磨表面的可旋转半球磨削装置中,该研磨表面具有一英寸半径的曲率,使得头部的记录表面与研磨工具的凹表面邻接地设置,并被研磨成 所需的一英寸曲率半径。 为了进一步改善记录表面的轮廓,保持器和头部然后转移到具有一英寸曲率半径的凹面抛光表面的半球形抛光装置,并且头部被抛光以去除记录表面上的凹凸。 这种对头部换能器的记录表面进行成形的方法为大量磁头换能器产生均匀的轮廓表面,并且提供适用于需要紧密公差的高密度数字和视频记录系统的高性能磁头。