SU1562108A1 - Method of orienting teeth of hob cutters - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in machine tools for sharpening worm cutters. The aim of the invention is to increase productivity by automating the process of orientation of the worm milling cutter. A worm milling cutter 1 is mounted on the mandrel 2, with the base end 3 of which the origin of coordinates is associated. Measurement tool 4 is installed in the plane of the CCP so that its measuring plane passes through the axis of the milling cutter 1 and, with the orientation of the milling cutter 1, begins to move along its axis. At the moment of intersection of the front surface of the milling cutter 1 with the plane of location of the measuring device 4, the coordinates of the measuring device and the angular coordinate of the milling machine relative to the coordinate system are fixed. 1 il.

Description

The invention relates to mechanical engineering and can be used in machines for sharpening worm mills.

The aim of the method is to increase productivity by automating the orientation of the worm cutter.

The drawing shows a diagram of the orientation of the worm cutter.

According to the orientation method, the worm cutter 1 is mounted on the mandrel 2, with the base end 3 of which the origin is connected. The measuring means 4 is installed in the YOZ plane so that its measuring plane passes through the axis of the mill 1 and when the orientation of the mill 1 begins to move along its axis. This movement is consistent with the rotation of the mill 1 around its axis in such a way that

ΔΧ_yatr

And ’where ΔΛ' — displacement of the measuring instrument along the X \ / 1 axis - the angle of rotation of the mill around its axis during the movement by ΔΧ;

then - axial module of the cutter;

and - the angle depending on the required accuracy and orientation performance.

The angle a should not be equal to 2π, because, otherwise, the helix along which the measuring means 4 are moved has an axial pitch equal to t = nmo and the measuring means 4, in the case of its initial location between the teeth of the mill cutter 1, never the cutter tooth 1 will not register. At an angle α> 4π, the measuring tool 4 will work guaranteed before it moves by one axial tooth pitch, which will provide more operations of the measuring tool 4 and higher accuracy, but this will lead to loss of productivity. Therefore, for short and multi-entry mills, the value of a is assigned more, and for long and single-entry mills less. After receiving the signal of the measuring means 4 when interacting with the tooth surface of the cutter 1, the rotation of the latter and the movement of the measuring means 4 are carried out in such a way that the ratio

Ax__m _o k

And ~~ 2 ’where k is the number of cutter hits.

In this case, the rotation angles of the mill 1 are recorded, at which the signal from the measuring means 4 is received when the latter interacts with the front surface of the teeth of the mill 1. If the angle of rotation of the mill 1 after the next signal is greater than the value

A <= AA <_ ί -f-δι + 62, where A is the angle of rotation of the cutter after the last signal of the measuring instrument;

ΔΑ_ι is the angle of rotation of the cutter between the last and penultimate signals of the measuring instrument;

δι is the angle equal to the tolerance on the difference of adjacent circumferential steps of the chip channels of the worm cutter;

$ 2 - an angle equal to the tolerance on the error in receiving the signals of the measuring instrument.

Orientation movements stop because this means that the measuring tool 4 has gone beyond the borders of the mill 1. Using the rotation angles between the sensor responses, the position of the teeth of the mill 1 in the coordinate system of the machine, the steps of the chip grooves, and the circumferential steps of the chip grooves are determined by the formulas p Σ Pzk _τ ΣΤ ki .

• 'M-VW.-A _u );

r ^ yJ-AM - +1).

where 7% is the pitch of the chip groove forming the front surface of the tooth;

T _to - the angle between the k-th and fe-J-1st tooth; Pc - the number of signals on the k-th tooth; Lk., Is the angular coordinate at which the ith signal is recorded on the kth tooth.

Claims (1)

Claim A method of orienting the teeth of worm mills when sharpening, in which they make a coordinated rotation of the milling cutter around its axis and moving the measuring instrument associated with the coordinate system of the machine, characterized in that, in order to increase productivity by automating the orientation process, the measuring instrument is moved along the longitudinal the axis of the mill and at the moment of crossing the front surface of the mill with the plane of the measuring instrument fix the coordinates of the measuring instrument and the angular coordinate of the mill from relative to the coordinate system of the machine, taking into account the specified coordinates, correct the dependence of the agreed rotation of the cutter and the movement of the measuring instrument, and according to this dependence, the coordinated movements of the cutter and measuring instruments with repeated recording of signals, while the coordinated movement of the cutter and measuring instruments continue until the angle of rotation of the cutter after the last signal exceeds the value A, = ΔΑ, -1 + 6, - + 62, where A, is the angle of rotation of the cutter after the last signal of the measuring instrument; ΔΑ, · _ι is the angle of rotation between the last and penultimate signals of the measuring instrument; δι is the angle equal to the tolerance on the difference of adjacent circumferential steps of the chip grooves of the sharpened worm mill; 62 is an angle equal to the tolerance on the accuracy of obtaining the measuring instrument.