GB393173A - Improvements in chamfering mechanism and method of chamfering gears - Google Patents

Abstract

393,173. Chamfering gear teeth. GLEASON WORKS, 1000, University Avenue, Rochester, New York, U.S.A.- (Assignees of Hill, M. H.; 1000, University Avenue, Rochester, New York, U.S.A.) Oct. 26, 1932, No. 29997. Convention date, Dec. 31, 1931. Addition to 375,247. [Class 83 (iii).] The attachment for chamfering gear teeth, described in the parent Specification, is modified by the provision of a pair of shaping tools T, T<1> which are moved to chamfer simultaneously the sharp corners at the inner end of a convex tooth flank 126 and at the outer end of the opposite concave tooth flank 128. In the application to a bevel gear cutting machine having a rotary face mill for cutting a blank G, a bracket 20 carries an adjustable bearing block 21, Fig. 7, which is guided in the bracket by a tongue 27. A hub portion 30 having an inclined axis 31 carries an arm 35 on which the tool T is mounted. A second bearing block 40 secured to the block 21 has a hub portion 43, the axis 44 of which is slightly inclined to the axis 31, and this hub portion supports the arm 50 carrying the tool T<1>. Each chamfering tool, Fig. 6, consists of a shank 55 with a portion 54 of trapezoidal section terminating in a cutting edge 56. The tool T is adjusted in its arm by means of a screw 64, and is locked by a set screw 60. The tool T<1> is secured in a block 70 by a recessed locking stud and the block is adjustably mounted on a wedge 74 which is in turn adjustable in a guide 76 in the arm 50. Fine adjustment of the block 70 is provided by a screw 82 and the block and wedge are locked by a bolt 77. The tool arms are connected by links 92, 100 to a member 85, which may be rocked either manually, in setting up, by a handle 140, or by mechanism working in unison with the machine so that each tooth is chamfered immediately after it is cut. In the form shown the member 85 is rocked by mechanism including a solenoid the core bar of which is connected to an arm 105. A spring normally holds the arms 35, 50 in inoperative position but when the solenoid is energized, the arm 105 is rocked to move the tools inwards to effect the chamfering. The solenoid is energized each time the cutter is removed from the blank. The outer end of the bracket 20 may be braced by a member 120. If sufficient clearance may be obtained between the arm 35 and the gear tooth milling-cutter, the axes 31, 44 may coincide. The axes 31, 44 are approximately perpendicular to a plane tangential to the root surface of the tooth space located at the point of operation and the tools are rotatably adjusted in their sockets in accordance with the pressure angle of the gear teeth.