SU1425001A1 - Method of controlling the gear-milling with hob cutter - Google Patents

Abstract

The invention relates to a machine tool industry and can be used in the manufacture of gears. The purpose of the invention is to increase the accuracy of milling by eliminating information about the torsional vibrations of the milling cutter. The angles Y and T of the turns respectively of the milling cutter 1 and the workpiece 2 are measured periodically and synchronously with a frequency equal for the cutter 1 to the frequency of the profiling of the teeth of the workpiece 2 by the combs 3 of the cutter 1J and for the workpiece 2 - equal to the frequency of the profile or more than an integral number of times. Converts the measured values of the angles r and f of turns into electrical signals. Electrical signal angle / rotation of the workpiece-. ki 2 is proportional to the number of teeth of the workpiece 2. The electrical signal of the rotation angle of the milling cutter 1 is corrected with respect to the moment of measuring the angle 7 of rotation of the workpiece 2, then proportional to the number of times the milling cutter 1 is compared. The given electrical signals are compared and output their difference to the input of the 4 rotation drive billet 2. 3 Il. (L tc sp

Description

The invention relates to machine tool construction and three manufacturing gear wheels can be used.

The purpose of the invention is to increase the precision of the milling by acquiring information on the torsional gears of the cutter, the frequency of which is equal to the frequency of the profiling, eliminating the disturbance of the drive of the rotation of the insert, reducing the angle of jBopoTa of the workpiece.

FIG. Figure 1 shows a control scheme for gear milling with a worm mill; in fig. 2 is a graph of the angle of the worm mill in time for a continuous measurement; in FIG. 3, when periodically measured, rynchronously with the frequency of profiling.

1 The method is carried out as follows.

I In the process of rotation, the angles of the flares y and P, respectively, the screw-cutting cuts 1 and the workpiece 2 are measured periodically and synchronously with the frequency, with the straightening for the cutter 1 of the curvature of the teeth of the workpiece.

2 dies 3 mills I, and for a workpiece / - equal to the profiling frequency f or more than an integral number of times. Profiling (point A) of the teeth of the workpiece 2 combs 3 cutters

1 occurs at the moment when the front surface of the comb B 3 mills 1 to

a plane perpendicular to the axis of rotation of the workpiece 2, parallel for cutting the spur gears or tilting at the angle of inclination of the teeth for cutting the helical gears. Frequency of periodic measurement of the angle of rotation

Items 2 are set in the following way.

If the frequency of the profiling is fj ,. is within the passband of the drive 4 of the rotation of the workpiece 2, then the frequency of the periodic measurement of the angle of rotation of the workpiece 2 is set: greater by an integer D times the frequency of the profiling. In addition, the number D is chosen such that the obtained frequency of measuring the angle of rotation of the workpiece 2 is outside the frequency band of the drive 4 of the rotation of the workpiece 2.

If the profiling frequency f is outside the frequency band of the drive 4 of the rotation of the workpiece 2, then the frequency of the periodic measurement of the angle of rotation H of the workpiece 2 is set equal to the frequency of the profiling

fh With the help of measuring units 5 and 6, the angles of rotation of the milling cutter 1 and the workpiece 2 are periodically measured and the measured values of the angles of rotation are converted into electrical signals. As a result, electrical signals are obtained from the angle of rotation of the milling cutter -T and the workpiece, where) .. i is the profiling number and j is the number of the measurement of the angle of rotation / workpiece 2 between two successive profiles, and j are assigned numbers, 2, 3, ..., D-1, D, and the number is assigned when measuring at the time of profiling.

Then, the electric signal of the rotation angle n of the milling cutter 1 is sequentially differentiated in blocks 7 and 8 and electric signals of the angular velocity and angular acceleration of the milling cutter 1 are obtained when profiling in accordance with the expressions

yi- (.) () and

(I) (2)

Q

five

0

,

where f is the angular velocity of the cutter 1

with the 1st number of profiled ... and ™;

 - angular acceleration of the milling cutter 1

with i-M profiling number.

After differentiation, the electric signal converted from the angle of rotation of the milling cutter 1 is corrected in block 9 with respect to the moment of measuring the angle of rotation U of the workpiece 2 in accordance with the expression

, ((3)

where: f; - corrected urol of rotation of the milling cutter 1 with i-M profiling and J - M measuring the angle of rotation of the workpiece 2 between two successive profiles. Then the electrical signals of the turning angles pi; The milling cutters 1 and ji j of the workpiece 2, respectively, in blocks 10 and P are converted into proportional electrical signals, for a milling cutter 1 proportional to its number of entries K and for the workpiece 2 proportional to its number of teeth Z.

After proportional electrical signals, the last

3 U25001

they compare with each other in block 12 and in the process of turning; yeni angles turn to the input of drive A of rotation, the tone, respectively, of the worm

billet 2, the difference between the electric cutters and the billet measure the period of the signals in accordance with the expression (synchronously and synchronously with the frequency equal to

KtP- -Z P-fil cutter frequency profiling f

 - - Hz teeth teeth blanks

Also at the inputs of the drive 4 rotation of the cutter, and for the workpiece - more than

blanks 2 from blocks 7 and 8 through the frequency of profiling Hz in

unit 13 gives electrical signals times, where D-3, set at angular speed, j, and angular acceleration, from the fact that the measurement frequency

Renee vpij Lresa I. the angle of rotation of the workpiece must be on rij and receive in block 13 in co-going outside the frequency band, skipping according to the expressions 0 to 42 Hz of the rotational drive. . .15 goods, i.e. Hz

711 I IK p (5) As a result of measurement and conversion

If you receive an electrical signal ijr 7p (6) of the angle of rotation of the cutter pj and the perforation milling error with the profiler 1, which occurs between 0 and - the number of the measurement of the angle by consecutive profile-P ° of the workpiece between the two is cut off during the last Pro-Profiling Profiles and j

filing of two consecutive. assign numbers:, 2,3, and

The number L is assigned when measured. Consequently. biased error - “.- f i„, „, scientific research institute at the time of profiling. Then

zerovani screwworm 1

.electric angle signal

only at the moment of profiling., fi,,.

tch Lreza consistently differentiation Therefore, the periodic measurement, yi - m h F m

 - ipiruyut, receive electrical signals

synchronous with the frequency profile- j t,

“. “. The angular velocity v-i and the angular angle gi of the rotation angle Φ of the wormhole; Lree; .

. i 1/30 roots of 1p in the course of profiling

Text 1, having a schedule of 14 in timeJT- - rt - j. .in accordance with the expressions t, reveals information about the values

angle of rotation f ...... cher-vf (v. i 20;

in the milling cutter 1, having; schedule 15T-f /. vJ - i 7p

(Fig. 3) in time t, in moments.)

jAj profiling; And j ..., 35 where these expressions are obtained, and excludes information about the values of the substitutions, respectively, in the expressions

noBopOTa angle of the worm cutter 1, not (He (2) Hz.

associated with profiling. After differentiation, electrical example. The control of the bite-cutter signal, converted from the cobble of a worm cutter while turning the cutter, corrects

cutting the front wheel gear relative to the moment of angle measurement

module with the number of teeth. Turn, -; blanks in accordance

For cutting, a worm is used to express the cutter with the number of visits and the number

combs. The rotation of the billet wasp-15 v. ili +0.5 tf- /. (iГ),

There is a complete thyristor 3 20 3 20

The electric drive with a frequency band of the extended expression was obtained by adjusting to 0-42 Hz. The rotation speed was changed to (3) Hz and.

Phew milling cutters set rav-then electric signals of angles

Noah 120 rev / min from the experience of zuboobrabot-50 p. f .. p, .. preparation of juices ". Respectively, the electric signals are proportional to the magnitude of the profiling frequency, for a cutter with combs of the cutter teeth of the workpiece is proportional to its number of visits K

at the frequency of the passage of my combs, the workpieces are proportional

profiling point (points A) and equal to 55 d are reduced to proportional electrical

 and g, g 1 signals last compare between

and 6D I-J with themselves and lead to the drive input of the driver 514250П1

billet the difference of electrical signals in accordance with the expression

bylj-49 ifi ;,

 This expression was obtained by substituting |) in (4) and.

Also, to the inputs of the drive of rotation of the workpiece, electric sig- gage speed tj and angular y are introduced: the root of the cutter

I ft N C-ii;

j /

that are obtained by substitution in (5) and (6) and Hz ..

claim 20

The method of controlling the gear milling of a screw mill, in which the measurement of the angles of rotation of the cutter and the workpiece, is carried out, and the measurements of the angle of rotation of the workpiece are converted.

15 of the workpiece is measured synchronously with the frequency of the profile of the teeth of the workpiece with combs of a tooth equal to the cutter, and for a workpiece equal to or more than an hour of profiling, and the electric signal converted from the angle of turn of the mill before relate to the moment

Reni rotation angle of the workpiece.

The measured values of the angles of rotation into electrical signals, the electrical signals are reduced in proportions, respectively, to the number of freyah visits and the number of teeth of the workpiece, the reduced electrical signals are compared and, by a signal equal to the difference of the indicated values, In order to improve the precision of the milling and control of the control devices, the angles of rotation of the cutter and the workpiece are measured synchronously with a frequency equal to the frequency of profiling of the teeth for the workpiece, equal to or greater than the profiling frequency an integer number of times, and the electrical signal converted from the angle of rotation of the cutter is adjusted relative to the moment of measurement

1

4f; I

H

AL

-

/

L - 7.

:

l

; l

i / ij

Claims (1)

The method of controlling a worm cutter, measures the angle of rotation of the cutter and the workpiece, converts the measured values of the angle of rotation into electrical signals, converts the electrical signals into values proportional to the number of cutters and the number of teeth of the workpiece, and compares the reduced electrical signals with a signal equal to the difference these values, control the drive rotation of the workpiece, characterized in that, in order to improve the accuracy of gear hobbing and simplify control devices, the rotation angles cutters and workpieces are measured synchronously with a frequency equal to the frequency of profiling of the teeth of the workpiece for the mill by the comb of the cutter, and for the workpiece, equal to the frequency of profiling or greater than it by an integer number of times, and the electric signal converted from the angle of rotation of the cutter before bringing it into a proportional number cutter approaches are adjusted relative to the moment of measuring the angle of rotation of the workpiece.