RU2230635C2 - Disc shaver - Google Patents

Abstract

FIELD: metal working, tools for working cylindrical gear wheels.

SUBSTANCE: shaver has cutting edges on lateral evolute helical surfaces of teeth and it is made with shift of initial contour of rack. Cutting edges are formed by crossing of helical surfaces of teeth of shaver Z with helical surfaces of cuttings grooves. Zc = Z +-1, where Zc -number of chip grooves.

EFFECT: enhanced efficiency and accuracy of working.

2 dwg

Description

The invention relates to metalworking, in particular to a metal-cutting tool for processing cylindrical gears.

Known disk shaver, equipped with two cutting edges formed by a groove in the form of a dovetail, dissecting the teeth of the shaver so that the axis of symmetry of this groove lies in a plane perpendicular to the axis of the shaver, or in the form of an oblique groove located at an angle to a plane perpendicular to the axis of the shaver [1]. Processing is carried out with free rotation of the shaver in tight engagement with the machined wheel with the feed of the shaver along the axis of the wheel.

The annular arrangement of the cutting edges necessitates the feed along the axis of the wheel and as a result of this reduction in productivity and machining accuracy.

Known shaver for machining gears [2], the teeth of which are cut into annular grooves with a depth exceeding the height of the involute part and forming the front surface of the cutting elements, and the grooves are made symmetrically with an angle between the sides of 160 ... 170 ° and a width less than the distance between adjacent the front surfaces of the cutting elements, and the width of the involute sections is equal to 0.005 ... 0.05 module.

The disadvantage of the design is the need for reciprocating movements that adversely affect the quality of processing.

Known disk shaver, the teeth of which are cut into annular grooves with a depth exceeding the height of the involute part of the teeth, in which one side is straight and the other stepped [3].

This design has the disadvantages of the previous design.

Known disk shaver with cutting edges on the sides of the teeth with different angles on the opposite sides, and the process of shewing throughout the cycle is carried out without reverse [4].

This design is highly labor intensive.

The objective of the invention is to create a technologically advanced tool design with high productivity and precision machining.

This problem is achieved by the fact that the helical side surfaces of the teeth are cut with standard gear cutting tools with one, for example, the right direction of the helical surface, and the chip grooves with the same tool, but with the opposite (in this case, the left) direction of the helical surface. The intersection of the helical surfaces of the teeth and the chip grooves form cutting edges.

The number of chip grooves should be one greater or less than the number of shaver teeth. Then the cutting edges will be located on the helical surface with the progress of the helix:

,

,

where S _oc is the stroke of the helical surface;

d is the diameter of the pitch circle;

β is the angle of elevation of the helical surface;

Z _c is the number of chip grooves;

Z is the number of teeth of the shaver,

will have an offset from tooth to tooth by

,

,

as a result, axial movement is not required to process the entire lateral surface of the workpiece.

The relative sliding of the teeth of the shaver along the teeth of the wheel is ensured by performing their gearing out of the pole, and the shaver for this is made with the offset of the original contour of the rail. Processing is carried out by the free rolling method with parallel axes with reverse rotation.

In FIG. 1 shows a simplified drawing of a disk shaver, in FIG. 2 - scan of the dividing cylinder.

For practical implementation of the proposed design, a disk shaver with a 3 mm module was manufactured, the number of shaver teeth was 35, the number of chip grooves was 34, the elevation angle of the helical line of the teeth and the chip groove was β ₃ and β _c = 18 °, the direction of the helix of the teeth was right, and chip flutes - left.

The proposed design of the shaver allows on average to reduce the complexity of its manufacture by 70% compared to shavers of the standard design, to improve the geometric parameters of the cutting part of the teeth.

Sources of information

1. V.I. Golikov. The technology for manufacturing precision cylindrical gears. M.: Mechanical Engineering, 1968, 160 p.

2. A.I. Korablev, D.N. Reshetov. Improving the bearing capacity and durability of gears. M.: Mechanical Engineering, 1968, 288 p.

3. Yu.N. Sukhorukov, R.I. Evstigneev. Sheving with parallel axes. M .: GOSINTI, 1963, 32 p.

4. A.S. USSR No. 174505, B 23 f 19/06, 1965.

Claims (1)

A disk shaver having cutting edges on the involute lateral helical surfaces of the teeth and made with an offset of the initial contour of the rack, characterized in that the cutting edges are formed by the intersection of the helical surfaces of the teeth of the shaver Z with the helical surfaces of the chip grooves, with Z _c = Z ± 1, where Z _c is the number of chip grooves.

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