SU1371874A1 - Method of sharpening end gear milling cutters - Google Patents

Abstract

The invention relates to a machine tool industry, the manufacture of metal cutting tools and can be used: -10- when sharpening end strands of modular cutters. The purpose of the image |) eteni; is an increase in the amount of sharpening of modular round cutters providing a stable rear angle along the sharpened neck edge. The abrasive wheel 1 is reported to rotate, and its axis 2 is equal to. Dimensional translational movement along the tangent to the trajectory of point A, lying on the axis 3 of the milling cutter 4 so that the specified trajectory coincides with the main circle section 9 of the imaginary gear wheel, which is cut by the mill 4. Continuous contact of the grinding head with the abrasive wheel 1 is ensured by the turning point of the smallpox 3 milling cutters 4 knobs Ovn: 1Ja1tseys center voob) () 1 oz) - cw wheel, cut into sharpened milling cutter 4. / sl1 nav ivayut equal 1. Korostiv I riocT ii; ruM, - 2-axis motion of the abrasive 4 yl. yu (L CZ

Description

FIG. one

i

WITH

oo

four

The invention relates to a machine tool industry, relates to the manufacture of metal cutting tools and can be used for sharpening end spindle modular cutters.

The aim of the invention is to improve the quality of sharpening modular round cutters by providing a stable back angle along the sharpening cutting edge.

FIG. 1 shows the sharpening scheme of the proposed method using a cylindrical abrasive wheel; on fi | -. 2 section A-A in FIG. one; in fig. 3- sharpening scheme proposed by the method when using a toroidal abrasive wheel; in fig. 4 is a section BB in FIG. 3

When using an abrasive wheel 1 of cylindrical shape, its axis 2 is set at an acute angle of 4 to the plane of rotation of the axis 3 of the milling cutter 4. The angle r | .- is equal to

 - -tgy-).

where p is the back angle that is needed

get when sharpened.

The diameter of the abrasive wheel 1 should be no more than

(/ 2m vO, 25Z3sirraj + Zf-f I - - (i. Z, -f Z isinrx J sinij l.

where d dir.metr abrasive wheel 1;

i module of an imaginary gear cut by sharpening the cutter 4;

Z NUM; 1O teeth of an imaginary gear wheel, cut with a sharpened cutter 4;

Zi is the number of teeth of the wheel, coupled with an imaginary gear cut by a zagazhivaemym cutter 4; a is the angle of engagement (usually).

 the cylindrical abrasive wheel 1, the diameter of which satisfies condition (2), cannot be selected, then a toroidal abrasive wheel I is used, having a radius in axial section

11rof ||. 1b.

When using a toroidal abra-; A circle G is set so that its axis 2 is parallel and at a distance D from the plane of rotation of the axis of the 3 milling cutter. The distance D is defined as

4 quiet rt

,

where dmax is the peripheral diameter of the toroidal abrasive wheel G. The radius of the profile of the toroidal abrasive wheel T should be no more than

 vO ,, + 1 - 0.5 (Z + Z) sinaj cospl.

(four)

5 where r is the radius of the profile of the toroidal abrasive wheel G.

The axis 3 of the milling cutter 4 is rotated around point O, which is the center of an imaginary gear wheel (not

Q is denoted), cut by a sharpened cutter 4. Point O, around which axis 3 of cutter 4 rotates, is on axis 3 of cutter 4 and is removed from the end part of cutter 4 (point C) at a distance of radius D around the pits of an imaginary gear wheel,

t5 cut with a sharpened cutter 4. The radius /, the circumference of the cavities of an imaginary gear, cut with a sharpened cutter 4, is determined from the dependence

/, f (Z-2.5).

20 After installing the abrasive wheel 1 or 1, the rotation is reported last and the rotation of the cutter 4 until the front surface 5 of her tooth 6, the cutting edge 7 of which will be sharpened, does not coincide with

2, the axis of rotation of axis 3 of the milling cutter 4. Then axis 2 of the abrasive disc 1 or G imparts a uniform translational motion tangential 8 to the trajectory 9 of point A of axis 3 of the milling cutter 4, which is in shape a portion of the main circle of the imaginary gear of the wheel cut by the milling cutter 4. At the same time, the axis 3 of the cutter 4 simultaneously rotates uniformly, ensuring the linear speed of the point A of the axis 3 of the cutter 4 on the main circle 9 equal to the speed V of the translational movement of the axis 2 of the abrasive wheel 1 or Г

,

(five)

where V is the speed of translational motion of the axis 2 of the abrasive wheel I or G; with - angular speed of rotation of the axis 3 of the cutter 4;

/.) is the radius of the main circle 9 of an imaginary gear wheel, cut by a sharpened cutter 4. When the shape of the cutting edge, dd caused by a change in the module and the number of teeth of the wheels cut by the sharpened cutter, is changed, it is enough to change the turn radius of the cutter axis. There is no need to correct the abrasive wheel, it is enough that in the plane of rotation of the mill axis, the radius of curvature of the 50 abra; the primary circle is smaller than the radius of curvature of the cutting edge

55

 V0. j + ZT + T-

- 0.5 (Zc + Z) sino (,

where Pcr is the radius of curvature of the abrasive wheel in the plane of rotation of the mill axis.

The proposed method makes it possible to shorten the preparation time of end spur modular cutters for sharpening, to obtain a constant back angle along the cutting edge and to eliminate the need for precise editing of the abrasive wheel.

Claims (1)

The invention of the method of sharpening modular end mills with an abrasive wheel, which ensures a constant contact of the surface to be sharpened with an abrasive wheel by turning the axis of the cutter, informs the abrasive wheel rotation and relative movement supply, characterized in that, in order to improve the quality of sharpening modular milling cutters by providing a stable back angle along the sharpened cutting edge, the movement of the abrasive wheel is carried out by telling it to evenly move along the tangent to the path described by the cutter and coinciding with the axis The total circumference of an imaginary gear cut by a sharpened cutter, while the linear speed of the cutter is set equal to the speed of the forward movement of the abrasive th circle. g / g one 3 one sz 2 FIG.  ice LJJoc / (oc / 77 (J Sjoff-oci / (