SU1306658A2 - Method of cutting gear wheels with gear-shaping cutter - Google Patents

Abstract

The invention relates to the field of metalworking, in particular to the cutting of gears with double barrel shape, which are used in gears with low precision assembly. The purpose of the invention is the expansion of technological capabilities due to the formation of double-barrel teeth. To ensure that a tooth is cut barrel-shaped across the width of the crown and the thickness of the tooth, the junction is set offset by the angle perpendicular to the grid perpendicular to the angle determined by the dependence of arcsin (e: f), where f and e is a pair, double-barrel width meters the ring gear and the thickness of the tooth, respectively. 3 il. h 14)

Description

The invention relates to metal working, in particular to the cutting of gears with double barrel shape. Double barreled gears are used in gears with increased assembly accuracy, with reduced noise levels, as well as in large gears, where it is difficult to observe the absence of misalignment and misalignment. The use of double barrel gears makes it possible to compensate for errors in the manufacture and assembly of gears and to increase their efficiency.

The purpose of the invention is the expansion of technological capabilities due to the formation of double-barrel teeth.

Figure 1 shows the mutual arrangement of the bit and the workpiece, the movements required to carry out the proposed method, and the parameters necessary to determine the desired displacement angle S to obtain a given barrel shape across the width of the rim and thickness and tooth; Fig. 2 shows the profile of the tooth along the width of the crown in Fig. 3, view A in Fig. 2, the shape of the tooth.

The wheel 1 receives a rotation around the axis B-B with a frequency with a determined cutting speed V, a also rotation with a circular feed S p about the vertical axis. Dolb 2 gets a rolling running consistent with the wheel and a radial displacement to a depth of S. To ensure the cutting of a barrel-shaped tooth across the width of the ring and the thickness of the tooth, the dolbe is set offset from the axial perpendicular. Offset to one side allows the barrel-shaped surface to be machined on one side of the teeth. To process the other side of the teeth, it is necessary either to move the die to the other side, or to reinstall the workpiece.

The calculation of the required angular displacement is performed as follows.

At the point B of contact of the dividing circles of the workpiece and the depth of the absolute angular velocity is u) the frequency of rotation of the workpiece, and its vector W is directed parallel to the axis B-B of rotation of the workpiece. We decompose the vector U) into two: along the normal and tangentially. Then the relative movement of the workpiece and the tool can

Imagine as the sum of the rotation of the workpiece relative to the axes 0-0 and. The rotation of the workpiece relative to the axis determines the flank formation of the tooth across the width of the crown, rotation relative to O-0. - barrel formation through the thickness of the tooth.

From the geometric relationships, you can determine the radii of curvature of the tooth flanks by the width of the rim Rg and

tooth thickness rr

AT

 R cos

(figure 1), S;

R

R - - - -

Z. cgY

When (fig.Z) we obtain that

R r

and R, i.e., during processing, the tooth becomes barrel-shaped only in width. When s 77/2 Rg O and R2 O, however, in practice this case will be limited by the thickness of the tooth along the pitch circle.

To determine the magnitude of the required angular displacement, consider Figure 2, from which it follows:

b 2

-2- iTWb - f}

b - the width of the crown;

RO is the radius of curvature of the barrel across the width of the crown, the barrel-shaped boom across the width of the crown. , 7. due to the smallness of f r-i -f Rbg and

(-one)

8R-COS S

In f

logical in the other direction ime

B

SR

ъ

 8 rz ratios

and (1)

- tg S. (2) (2) should:

S arc sin - t

Where

e - boom barrel

the thickness of the tooth.

Example. Handle wheel: m 2.5; b 40; z 80; material - art. 40X. The tool is hollow to standard, material R6M5, cutting speed V 30 m / min. Workpiece rotation speed

 Thats

Suo-30,

 50 rpm

Know the magnitude of barrel shape on the width of the crown, for example, f 0.2 mm, and

the thickness of the tooth, for example, e 0.1 mm, we get

Claims (1)

S arc sin - | 30. The claims The method of cutting gears dolby on avt., St. 1034857, о t - is characterized by the fact that, in order to expand technological capabilities by forming teeth with a double barrel, dolb k set with an offset from the center axis perpendicular to the angle determined by the dependence 1 / arcsin --- where f and e are the parameters of the double barrel with the width of the ring gear and the thickness of the tooth, respectively. X figure 1 FIG. g viewA Compiled by I.Kuznetsova Editor E.Sligan Tehred N.Glushchenko. Proofreader T. Kolb Order 1483/9 Circulation 976 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 fi.3