SU59129A1 - A method of manufacturing bevel gears with teeth of involute outline in the longitudinal direction - Google Patents

Description

Conic wheels with involute teeth in the longitudinal direction are used in many machines. Typically, in the manufacture of such wheels, the product rotates around a fixed axis, and the cutting tool — a conic screw-type worm — in addition to rotating around its own axis, also receives a portable circular motion. The proposed method differs from the known methods in that the product is conveyed by the movement of the feed in an involute relative to a rotating around a fixed axis of a screw mill.

In order to explain the essence of the method according to the invention, FIG. 1 is a schematic diagram of the arrangement of the product and the milling cutter; in fig. 2-kinematic machine diagram for implementing the method; in fig. 3 is a diagram of an involute cam profile to the machine in FIG. 2; in fig. 4 - changing part of the machine diagram of FIG. 2

In order to obtain teeth of an involute shape in the longitudinal direction on conical wheels, in the proposed machine, the product must receive two movements — a rotational pitch and a portable involute, and a conic worm cutter — a rotation around its own axis.

The product axis A is rigidly connected to the shaft M of an imaginary circle L, which rolls without sliding along the straight O-O, and its center moves progressively parallel to this straight line (Fig. 1). The product, on the other hand, receives this translational motion, moreover, is transferred around the shaft M. Imaginary circle L lies in a plane tangential to the initial cone of the cut gear. The H axis of the milling cutter is parallel to this plane. The combination of the translational and figurative movements of the product while simultaneously conjugating the rotation of the product and the worm milling cutter around its axes will give an involute combination of teeth in the longitudinal direction of the cut conical wheel.

The rotation of the product around its axis A and the rotation of the cutter are connected by a dividing chain (Fig. 2), including the H axis of the hopper, scissors, d, e, g, tuning guitar Y,

Worm gear to N, wheels g, o, t -k axis A of the product.

The balance equation for the operation of this circuit is as follows:

one revolution of the cutter

with . with . k 1 o p

d g J JT o T z

where n. - the number of visits mills,

Z is the number of teeth of the wheel being cut.

From this equation, determine the gear ratio of the replacement wheels of the guitar tuning K

Rotation of the cutter and movement of the product is connected by a chain of feeds, including the axis of the cutter H, wheels c, d, e, g, guitar tuning Y, guitars of replaceable wheels x and feeds “worm gear / g -J, cam Q, which acts on the rocker I, the last one, tells the pusher to move along its guides. The pusher, in turn, is associated with the shaft M, which will move according to the same law as the pusher p. During the forward movement of the shaft M, the center of the drum B, which is rigidly mounted on the shaft M, will move along with it. At the same time, the drum will rotate around its axis, rolling along a certain plane with which it is associated with steel strips C. Consequently The shaft M will not only move progressively, but also rotate around its own axis. Both of these movements will also be received by the product, namely: if moving progressively, it will rotate around the shaft M. In relation to the cutter, the product will thus receive movement along the involute. The cam Q should have a profile in which an uneven translational movement would be communicated to the shaft M, ensuring uniform movement of the product relative to the cutting turns of the cutter. The cam rotational speed will determine the feed rate per revolution of the cutter (or product).

The cam profile Q is determined from the following conclusions. The circle I, along with the plane P rigidly connected with it, rolls without sliding along a fixed straight line B-O (Fig. 3), and the point a of this line describes an involute on the moving plane. Involute length:

,

where y- is the angle of rotation. If / is the center path, then from the proportion

r.D 2 have

0. - ./,

then

D 4

about

Di

from where

l YS-D.

This equation determines the law of displacement of the center of the circle, and hence the translational movement of the shaft M.

Will take

D DQ k with DQ - const.

At a constant feed, const 5 should vary uniformly.

If “o is the number of revolutions of the cutter in minutes t — time, then

about - fin

or

I yno- t k if

l fD then / / 1.

In the proposed involute machine, the outline of the tooth is determined by the diameter D of the drum B, therefore

the k-7 coefficient determines the evol-0

The vent shape of the cut tooth, and S and "O" determine the milling mode.

The value for this work is constant, hence the cam Q can be constant with a profile corresponding to the equation

l, VD, .t.

According to this work, the value of 1 / Lo-8-A is determined by the ratio of the shoulders backstage P

one/

So, the translational motion of the shaft M will occur according to the law

If we replace guitar X with the speed box and guitar with the feed box, then only one tuning guitar Y will remain in the machine, the calculation formula for which will be:

y-jl z.p

where p is a constant of the division chain.

Drum B is replaceable; its diameter is equal to the diameter of the main circle of the involute, along which the tooth is outlined.

When the shaft M is rotated, gear O, rolling around gear i, reports an additional rotation to the product, which violates the previously established balance of operation of the dividing chain. To compensate for this violation, a gear is used, in which the wheel /, which is rigidly mounted on the shaft of the UNIVERSITY, engages with the U rail. In this case, the screw to works as a rack and gear, together with additional rotation of the wheel L /, and thus the workpiece. This movement must be opposite to the additional movement arising from the rolls of the jaws O and i. By size

they will be equal when the initial diameters of the wheels / and N are equal.

Instead of the drum B, the following system can be applied (Fig. 4). Here:

R - serrated rake 1 - guitar tuning D-diameter of the main circumference of the involute of the longitudinal outline of the prong p - constant of the chain. The balance equation of the circuit:

- -r-b 1 about. shaft M,

, - p V - 5-.

In this case, the following calculated displacements serve as the initial value of the chain adjustment. With the longitudinal movement of the rail R by the value of -K-D, the shaft M must make one revolution.

subject matter of the invention.

A method of manufacturing conical gears with involute teeth in the longitudinal direction of a conical screw-cutter according to the rolling-in method, indicated by the fact that the product is conveyed by an involute movement relative to a rotating mill-axis rotating around a fixed axis.

Fig /. Fig2. -9J and d JX figz. Figl. -777 I1. .J