SU1348099A1 - Cylindrical spiral miller - Google Patents

Abstract

The invention relates to mechanical engineering and can be used when cutting flat wheels of cylindrical spiroid wheels. The aim of the invention is to increase the durability of spiroid gears by cutting the wheels with a worm mill designed on the basis of a worm machine with a dividing surface having a globoid shape and forming a circular arc in the form of an arc. The cylindrical spiroid cutter has cutting teeth 1, the opposite side surfaces 2 and 3 of which are profiled on the basis of a worm generator with a globoid separating surface. The opposite side surfaces 2 and 3 of the teeth 1 are made on the producing surfaces formed on the basis of the dividing surfaces of globoid worms that have a common throat; circumference and different radii of curvature Rpi and Rjj, the ratio of which is K 1,5 - - 1,4 К K 1,3-1,2, respectively, with oi equal to 8-12 and 13-18. The milling cutter can be made with either straight or curved cutting edges. 1 hp f-ly, 2 ill. i (L with 4 00 about; p about

Description

The invention relates to gear processing and can be used when cutting flat wheels of cylindrical spiroid gears.

The purpose of the invention is to increase the durability of spiroid gears by cutting the wheels with a cylindrical screw mill, shaped on the basis of a worm generator, with a dividing surface having a globoid shape and forming a circular arc in the form of an arc.

Figure 1 shows the screwdriver of figure 2 - the cavity of the tooth of the mill.

A cylindrical spiroid cutter for cutting spiroid wheels, having cutting teeth 1, side surfaces 2 and 3 of which are profiled on the basis of a producing worm with a globoid separating surface. The opposite side surfaces 2 and 3 of the teeth 1 are made on the producing surfaces formed on the basis of the dividing surfaces of globoid screws with a common throat circumference and different radii of curvature

R, R

OR OL

The ratio of the radii of the Cree K is chosen equal to

° oi

1.4 at the angle of the profile of the right x cutting edges, equal to i K 1.3 - 1.2 with Dtp 13

Radius value K,

dependencies

Where

may be

04

found from

(4S - b) 88,), where b is the width of the crown of the cut-out wheel proposed by the cutter, measured in a plane parallel to the axis of the wheel and spaced from it at a distance equal to the center wheel distance and the cutter; S; - the amount of removal of the forming arc of a circle of radius R from a straight line in contact with it, parallel to the mill axis, is set at a distance of 0.5b from the point of contact of the indicated arc and straight and is equal to 0.25 - 0.16 and 0.15 - 0, 1 mm with a pitch angle ot, j profile of the right side cutting edge of the mill tooth, equal to 8–12 and –13–18 °, respectively.

The diameter of the total throat circumference of the cutter surfaces of the cutter is equal to the diameter of the splitter cylinder of a known cylindrical spiroid cutter used to cut spiroid wheels with teeth that do not have a longitudinal modification of the side surfaces. Lateral producing surfaces of turns realized. The proposed mill of the generating screw is formed as a result of the addition of the screw and the pitch radial movements of the forming curves proportional to it.

The cutter can be made either with a near-linear profile of the side cutting edges of the teeth, or with a curved profile of the edges. In both cases, the angles ct, the profiles of the right and left lateral cutting edges of the cutter teeth, each of which has the same value at all points of intersection of these edges with the corresponding pitch surface of the cutter, are equal to the corresponding pitch corners of the profile of the spyroid screw, which engages with the wheel cut by this mill

The structure of the chip grooves of the proposed cutter is fully consistent with the structure of the chip grooves of a known cylindrical spiroid cutter.

Cutting flat spiroid wheels with the proposed cutter, as well as the known one, is carried out on a hobbing machine in a manner in which the cutter feeds in the direction of

along the axis of the machined wheel. At the same time, the milling cutter is installed relative to the wheel in such a way that its axis is removed from its axis by a distance equal to the center axis.

the distance in the engagement of these cutters and wheels, and the total throat circumference of the cutter surfaces of the cutter is located near the point of intersection of the axis of the latter with the middle cylinder

wheels.

Claims (2)

1. A cylindrical spiroid cutter for cutting flat spiroid wheels containing teeth with a longitudinal modification of the side surfaces, shaped on the basis of a spiroid producing screw with a dividing surface, having a globoid shape and as a forming arc of a circle that differs that, in order to increase the durability of the spiroid wheels, the opposite side surfaces of the teeth are made on the producing surfaces formed on the basis of the corresponding dividing surfaces of globoid screws, and eyuschih total throat circumference and different radii of the circles forming the arcs, 2. The milling cutter pop.1, about Hlichayu- m and with the fact that the ratio of the radii of a yun respectively 8 - 12 ° and 13 -18 The RO and RQJ of the forming arcs of the circumference of opposite right and left separating surfaces are chosen to be SJJL- RO " ny K, where K - coefficient, rav1, 5 - 1.4 and 1.3 - 1.2 with a dividing angle of the profile "6 and right) side cutting edge of the tooth of the mill, equal to Mr. 8 - 12 ° and 13 -18, respectively RO- and RQJ forming arcs of circles of opposite sides of the right and left dividing surfaces are chosen to be SJJL- RO " ny K, where K - coefficient, rav1, 5 - 1.4 and 1.3 - 1.2 with a dividing angle of the profile "6 and right) side cutting edge of the tooth of the mill, equal to Fi € .2