SU1393554A1 - Method of producing a set of tooth-cutting tool for generating a pair of bevel wheels with circular teeth - Google Patents

Abstract

The invention relates to the field of mechanical engineering, in particular, to the technology of manufacturing a cutting tool. The purpose of the invention is to improve the manufacturability of the production of a set of heads designed for machining a pair of conical wheels with circular teeth. The angles of inclination J of the profiling straight cutting edges and tools for machining the adjacent sides of the circular teeth of the bevel gears and gears are assumed to be the same in size. This makes it possible to use tool cases with the same angles of inclination of their grooves, as well as to avoid additional sharpening, which reduces the laboriousness of manufacturing and operating the tool. In order to maintain the congruency along the profile of the teeth of the wheel and gear that are machined, which is disturbed when the profiling edge is tilted, the radii of the tool for machining the gears are corrected and calculated from certain ratios. These radii are reproduced in the instrument with the help of linings, which are provided by its design. 4 il. with S (L 00 (X) 00 ate 4

Description

The invention relates to the field of mechanical engineering, in particular, the technology for manufacturing a cutting tool.

The purpose of the invention is to improve the manufacturability of the production of a set of heads designed to treat a pair of conical wheels with circular teeth.

Figure 1 shows the installation of cutters in a gear-cutting head for machining a wheel; FIG. 2 is a schematic of the set of 1 and a cutter in a gear-cutting head for machining the convex side of a gear tooth; in FIG. 3, the same for processing the concave side of a gear tooth; Fig. 4 is a general diagram of the formation of a hyperbolloid generating surface during rotation of a straight, inclined cutting edge.

The method is carried out as follows.

Toothed tooth, the head for machining the wheel is made with a set of cutters w, the main edges 1 of which are inclined at an angle J. Gear-cutting heads for machining gears are made with profiling cutting edges 2, which have the same angle of inclination y, and the generating radii are determined from the ratios

R;

R,

 R

 R:

(. |,

"2 SoYe-g Sozir,

81, de Rj — generating radius of a gear cutting head for machining the convex side of a gear tooth;

Rg, is the generating radius of the gear-cutting head for machining the concave side of the gear tooth;

R; - producing the radius of the gear-cutting head for machining the convex side of the wheel tooth;

Rg - production of the radius of the gear-cutting head for processing the concave side of the wheel tooth;

ot i) is the angle of the cutter profile of the gear-cutting head for machining the convex side of the shestersh tooth;

Y

e

01; e-i-angle profile of the cutter of the gear-cutting head for machining the concave side of the gear tooth;

the angle of the cutter profile of the gear cutting head for machining the tough side of the wheel tooth;

the angle of the cutter profile of the gear head for machining the concave side of the wheel tooth.

These ratios are derived on the basis of known principles of providing gear couplings of gears. In order for the gears to be mated, it is necessary that the producing surface be uniform when machining both the wheel and the gears. The unity of the producing surface is maintained when the main curvatures (longitudinal and profile) of the producing surface for machining the wheel are equal to the main curvatures of the producing surface for machining the gear. However, in order to obtain in the mesh a certain length of the zone of contact, the longitudinal curvatures are deliberately chosen different. Consequently, to obtain matching wheels along a profile, it is necessary that the profile curvatures be equal to:

one

one

R, R, From R, Ra.

In addition, straight cutting main edges of the incisors, not lying due to their inclination D in the axial plane of the tool, describe during rotation the hyperbolloid generating surfaces, the radius of curvature R of the axial section of which at the calculated point P is determined by the dependence

R -

where r is the tool producing radius;

J - the angle of the main

edges -, about - a corner a profile of the tool.

Therefore r, r V, sEiglj

cos oi cos

Taking into account that the angles of inclination of the main cutting edges in this case are equal to J, - -1, we get

R,

cos-oi,

Cos oi ,,

Since the convex side of the gear tooth contacts with the concave side of the wheel tooth, and the concave side contacts with the convex side,

3554

planes, characterized in that, in order to improve the manufacturability of the toolkit, the angles of inclination of the main cutting edges of each head are the same, and the generating radii of the two heads intended for machining the gears

R r

. its fable

R

ei

 Ri

cos

,

The radii-producing radii determined from these ratios are reproduced in the gear-cutting heads with the help of the lining 3 and provide a match for the wheel teeth profile without undoing the tool bodies or sharpening the front surface of the cutters. A change in the tool producing radii leads to an increase in the length of the touch zone by an average of 15–20% compared with the touch zone obtained by an instrument whose main cutting edges are not inclined. This increase can be accounted for in advance when assigning the length of the touch zone.

Claims (1)

Invention Formula A method for manufacturing a set of a gear-cutting tool for machining a pair of conical wheels with circular teeth, comprising a double-sided head, designed to handle wheels and two one-sided heads, designed to handle gears, while the longitudinal curvatures of the hyperboloid producing surfaces of each head correspond to generating radii, the values of which are determined from the condition of obtaining the size of the zone of contact between the profiles of the teeth of a conical pair, and the profiling straight cutting edges each Doy heads are inclined relative to their axial nor, determined from the ratios ten 15 20 25 thirty  b 35 40  R, where is R; R; er oi ;, oSr. (X-1, e C05 b ,,  R. .; ,, producing a radius of a gear-cutting head for machining the spin side of a gear tooth; producing a radius of a gear cutting head for machining the concave side of a gear tooth; radius of the gear-cutting head for machining the convex side of the tooth of the wheel; producing a radius of a gear cutting head for machining the concave side of the wheel tooth; the angle of the cutter profile of the gear head for machining the convex side of the gear tooth; the angle of the cutter profile of the gear cutting head for machining the concave side of the gear tooth; the angle of the cutter profile of the gear head for machining the convex side of the wheel tooth; the angle of the cutter profile of the gear head for machining the concave side of the wheel tooth. figure 1 Fi7.3 FIG. 2