| 摘要 |
<p>1,026,299. Gear-cutters; grinding wheel. FELLOWS GEAR SHAPER CO. Nov. 30, 1964 [July 30, 1964], No. 48641/64. Headings B3D, B3K and B3L. A method of forming a gear shaper cutter comprises rolling the cutter past a rotating tool to generate an active involute portion and a modified portion on each tooth, relatively reciprocating the tool along the teeth, and relatively feeding the tool depthwise of the teeth along a predetermined curved path so that, when the cutter is subsequently sharpened, the relative positions of the portions of the teeth remain unaltered. The cutter 1, Fig. 4 (not shown), to be ground is fed along a path P-P against the face of a grinding wheel having a plane surface 3 to generate the involute and a conical face L-L to generate the modified cutter-tooth root which, in use, produces a gear with teeth having involute-chamfered tips. The wheel is fed in along a path E-E, Fig. 3 (not shown), the path being concave when the cutter is for external, and convex for internal, gears. The wheel is set at an angle to obtain side clearance for the teeth, the angle being increased when helical cutters are to be ground.</p> |
