GB582595A - Improvements in or relating to methods of and apparatus for grinding articles of irregular form - Google Patents

Abstract

582,595. Grinding-apparatus. CARTNER, J., and DAVIES, R. July 3, 1944, No. 12656. [Class 60] In the grinding of articles, for example, dies, of irregular form, the article is fixed in relation to a cam having a profile parallel to that required in the article, the cam being gyrated whilst maintained in contact with an abutment having its cam contacting face adjustable in relation to the axis of the grinding-wheel, the cam being gyrated in a plane at right angles to the grinding-wheel axis. For the grinding of an external or internal workpiece by the use of an internal cam, a cam plate 10, Figs. 1 and 3, is employed with parallel internal and external cam contours 11, 12, the plate resting freely on the worktable 13 and the grinding-wheel 14 being mounted on an axis at right angles to the table. The contour 11 is engaged by a follower roller 15 having a conical bore 16 in which is the conical head 17 of a spindle 18 coaxial with the wheel 14, and the cam is driven by a friction roller 22 engaging the external surface of the cam ; by axial adjustment of the spindle 18, the roller 15 and the cam 10 are displaced horizontally, the roller 22 moving correspondingly so that the work-piece is moved to or from the grinding-wheel. The roller 22 is carried by an axle 23 mounted in one end of a lever 25 pivoted to the table 13 at 26 and the axle 23 is driven by chain gearing 30-32; a hole 34 in the lever receives a spring or weighted cable to press the roller 22 against the cam 10. On the cam are pillars 35 carrying a plate 36 provided with tapped holes 37 to receive bolts 38 for securing the work-piece 39, spaced by collars 42, to the plate 36. In operation, the cam 10 is gyrated by the rotation of the roller 22, the work-piece 39 thus being moved correspondingly past the grinding-wheel 14, cut being applied by adjustment of the spindle 18, which is screwed to engage an internally threaded sleeve 44 secured to the table 13 and rotated by a graduated hand-wheel 43. An external profile also may be ground, using the external cam 12. In a modification the axis of the grinding- wheel is horizontal, the wheel being mounted on a slide 77, Fig. 5, adjustable by rack gearing 81-83, and the cam 10 being secured by bolts 35 to a face-plate 60 mounted on a spindle 61 ; the work-piece 39 is secured by bolts &c. 42 to a second face-plate 64 also mounted on the spindle 61. The spindle is carried at one end of a balanced lever 62 pivoted on a carriage movable on rails at right-angles to the axis of the grinding-wheel, and the cam is rotated by a friction roller 22 driven by a motor 75 and carried by one end of a pivoted arm 71. The follower roller 15 is adjusted by the coned end of the spindle 18 which engages a nut 44a and is provided with a hand-wheel 43a. The master cam and work may be mounted on a fixed bearing and the grinding-wheel head and adjusting spindle with the follower rigidly connected to move as a unit.