SU1542714A1 - Method of cutting toothed articles - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to the manufacture of gears and screws. The purpose of the invention is the expansion of technological capabilities by cutting gear articles with a given radius of curvature of the initial circle in axial section. When cutting several sizes of gear products (wheels or screws with different pitch diameters), it is possible to use a bit of one size, and the longitudinal feed does not coincide with the axis of the bit or piece. The angle between the feed direction and the tool axis is determined according to the dependency shown in the description of the invention. Since the initial surface of the generating wheel is an oblique cylinder, the axis of which is with the axis of rotation of the tool angle δ, and the initial circle of radius R _o is located in a section perpendicular to the axis of rotation of the tool, the radius of curvature of the initial surface of the product ρ affects how radius R _o and angle δ, which makes it possible to use the restricted nomenclature of standard tools, and to obtain a given value ρ by choosing the feed direction determined by the angle δ. 1 il.

Description

The invention relates to mechanical engineering, in particular to the manufacture of gears and screws.

The purpose of the invention is the expansion of technological capabilities due to the cutting of gear products with a given radius of curvature of the initial surface in axial section.

The drawing shows a diagram of the cutting of teeth of the worm dolby.

When cutting the teeth of the worm 1 Dolby 2, according to the assembly conditions, the relation u must be observed, where r0 is the radius of the initial circle of the cavity, r is the radius of the initial circumference of the workpiece; p is the radius of curvature of the initial surface in the axial section of the workpiece.

However, it is not always possible to select such a dolby.

When cutting several sizes of gear products (wheels or screws with different pitch diameters), it is possible to use a bit of one size, and the longitudinal feed does not coincide with the axis of the bit or piece. The angle between the feed direction and the tool axis (b) is determined by the dependence

sd

4 S 1

t S is-isis Ј - Ј2§Ј ± l slE ± Ј ° .Ј ° s llIlIeLsisiЈ г -sin2 / 3 - cos p

About -

where g is the radius of the initial circumference of the cut product;

the radius of curvature of the initial surface in the axial section of the cut product;

radius of the dividing circle of the socket;

P - the angle of inclination of the teeth or turns

Worm of the processed product,

while the characters "± correspond to two

possible feed directions, one of

which is chosen taking into account the kinematic

- Schemes of a specific machine.

Since the initial surface of the generating wheel is an oblique cylinder whose axis is an angle b with the axis of rotation of the tool, and the initial circle of radius r is located in a section perpendicular to the axis of rotation of the tool, and the radius of curvature of the initial surface of the cut product is em both the radius r ,, and the angle 6, which makes it possible to use the limited nomenclature of standard tools, and to obtain the specified value p by choosing the feed direction determined by the angle ft

The proposed method can be implemented, for example, on a gear milling machine with a tangential caliper.

The workpiece 1 is fixed by the ti spindle, and the tool 2 (front hole k) is installed in the centers of the machine table. In so doing, the product to be processed is informed of the movement of the feed along the vector V in the direction constituting an angle 6 with the axis of rotation of the groove. On a gear milling machine with a tangential caliper, two feed movements are used at the same time to get the product moving in the specified direction:

(r + §) sin $ -cosf + y (r + r0 cos2JJ) -r- r0-sin2Ј

r-sin20 - y cos2f

where 6 is the directional angle of the longitudinal feed relative to the axis of rotation of the slot;

g is the radius of the initial circumference of the cut product;

p is the radius of curvature of the initial surface in the axial section of the cut product

V growth (along the axis of the product and at a speed Y 2 along the axis of the tool.

At the same time, the feed speeds are interconnected directly through angle 6 by the condition that is used when setting up the kinematic scheme of the machine, i.e.

V

sinft

sm (6 + p)

Ut

YU

The angular velocities of the product and the tool are determined by the formula

oh oh

V

(01 f tg $

L Z0

0

five

0

five

where 7 |, Z0 - respectively, the number of teeth of the product and tool.

With this adjustment of the machine, the feed motion is carried out in the direction of the velocity vector V, so that it is possible to vary the geometrical parameters of the wheels (screws), for example, reduce the reduced curvature, which depends not only on the radius of the tool pitch circle, but also on the feed direction.

Claims (1)

Invention Formula The method of cutting gear products with a dollet installed at an angle to the product axis under conditions of point contact with a coordinated rotation of each element of the tool – work piece and a longitudinal feed, characterized in that, in order to expand technological capabilities by cutting gear products with a given the radius of curvature of the initial surface in the axial section, the longitudinal feed is carried out under the fragile to the axis of rotation of the slot, which is determined by the dependence r0 is the radius of the dividing circle of the ditch; P is the angle of inclination of the teeth or turns of the workpiece (± signs correspond to two possible directions of supply, one of which is chosen taking into account the kinematic scheme of a particular machine). BUT