SU1252084A1 - Single-thread hob - Google Patents

Description

The invention relates to mechanical engineering and can be used when cutting cylindrical and bevel gears.

The aim of the invention is to expand technological capabilities by cutting a range of gears with one tool.

FIG. 1 shows a single-screw milling cutter; in fig. 2 is a view A of FIG. one; in fig. 3 is a scan of the initial contour and the helix arrangement of the teeth; in fig. 4 is a section BB in FIG. 3; in fig. 5 - installation of the cutter when cutting the teeth of various modules.

Worm screw single screw cutter 1 containing teeth 2, the profile of which is identical to the tooth profile of a flat tool rail of reduced thickness with the angle of the initial contour. The side cutting edges of the teeth 2 are located on the helical surfaces 3 and 4, as well as 5 and 6.

Screw surfaces 3 and 4, as well as 5 n 6, are made with angles c (, and (2 lifts, respectively, the top of which is less than the helix angle of the helix of the original contour 7. Opposite side cutting edges 8-11 of the cutter teeth are located on the helical surface, Corresponding to the initial contour. Up to the middle tooth of the cutter, the angle of elevation of the screw surface on the side of the cutting edges coinciding with the sides of the teeth of the original contour is greater than the angle of elevation of the screw surface on the side of the cutting edges that do not coincide with the sides of the teeth of the original rail The cutter can cut the teeth of the wheels of the range of modules from t - to - n "ai

The opposite side cutting edges 8 and 9 of the extreme teeth of the cutter coincide with the sides of the teeth of the drive rail of the original contour 7, the opposite side cutting edges

252084.

edges 10 and 11 form extreme

teeth 12 and 13 are cutters of reduced thickness with an angle of the initial contour and a height V equal to the height of the tooth of the rebar of the initial contour of the larger module. The location of the cutting edges 10 and 11 relative to the tooth of the recirculation rod of the initial contour 7 is chosen from the ratio of the modules O max and min which determine

step range P,

cut5

my teeth teeth wheels. In the middle of the coil, the opposite cutting edges 14 and 15 form the middle tooth of the cutter with the profile of a cutting rod 16 of a smaller modulus f, and the tooth height C The opposite edges of the cutter teeth located between the middle and extreme teeth are located on the helical surfaces x 3 and 4 with an angle o1, a lift and 5 and 6 with an angle olj of lift, which is less than the angle oL. When cutting teeth of wheels of a smaller module tn, the axis of rotation of the cutter relative to the workpiece to be welded should be set at an angle / 3,. Then the cutter teeth located along the screw line OA will cut the tooth into the workpiece with a step P, f,. When installing

0 axis of rotation at an angle p of raising the helix of the original contour 7 of the cutter teeth cutting trajectory coincides with the helical line OU, but since the turn OA of the cutter is smaller than the turn of the cutter OB of the original contour, the cutter processes the tooth on the workpiece with step P,. In order to cut the teeth on the workpiece in increments of gpah, the axis of rotation of the milling cutter must be set at an angle p greater than the angle p. When cutting conical wheels, the cutter must be continuously tilted from the angle p, to the angle f, when the cutter moves along the tooth from the center of the wheel. At installation of a mill it is necessary to consider height of the cut tooth.

Yu

Fig 2

6-6

FIG.

BUT

Fi9.3

Compiled by A.Gadatelev Editor I.Shulla Tehred F1.Bonkloh

Order 4568/14

Circulation 1001 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

FIG. five

Proofreader T. Kolb

Claims (2)

1. WORM SINGLE ROTARY MILL, containing teeth, the profile of which is identical to the tooth profile of a straight-line tool rail of reduced thickness with a helical source contour, and the side cutting edges are located on a helical surface, characterized in that, in order to expand technological capabilities, the helical surface is made with an angle of elevation less than the angle of elevation of the helix of the original contour, and the opposite side cutting edges of the extreme teeth of the cutter are located on the helical surface corresponding to the original at the circuit. 2. The mill on π. 1, characterized in that up to the middle cutter tooth, the angle of elevation of the helical surface from the cutting edges that coincide with the sides of the teeth of the original contour is greater than the angle of elevation of the helical surface from the sides of the cutting edges that do not coincide with the sides of the teeth of the original contour. SU „., 1252084