SU666016A1 - Nc gear-milling machine - Google Patents

Description

The invention relates to the field of mechanical engineering and is intended for use in gear processing machines that require high precision synchronization of movements of the executive elements of the machine moving one relative to another at different speeds. A gear milling machine is known using an electronic guitar tuning, pulsed transducers PI and a system for correcting inaccuracies of mechanical transmissions, which use a signal proportional to the phase shift AND installed on the separating screw and instrument spindle to control the next table drive. these IP, pulses IP tool spindle is divided by the number of teeth cut, multiplied by the number of visits mills 1. For the implementation of the division operation With hardware without accumulating the error, the number of pulses of the instrument tool spindle per revolution must be equal to the product of the pulse number per revolution of the differential generator per multiplied by the gear ratio of the separation pair. These requirements impose restrictions on the maximum gear ratio of the dividing pair, which contributes to a decrease in the accuracy of the machine. In addition, the tool spindle sensor must have high resolution and correspondingly high cost. In the specified machine, installing the CID on the separating screw, rather than on the machine table, does not allow to eliminate the errors of the separator pair. In addition, it is not possible to cut helical gears. For cutting helical droplets in the machine, additional PIs are installed, mounted on the vertical feed spindle, and a control loop. which significantly complicates the machine system. The disadvantage of the machine is also low accuracy of an electromechanical correction device containing mechanical gears limited by a limited number of stepper motor pulses per revolution, as well as static and dynamic errors of hydraulic torque amplifiers.

The aim of the invention is to improve the accuracy of machined Wheels (helical, spur, hub teeth) without using MPs of increased accuracy and resolution of the ability for correction circuits and the following drives:

The goal is achieved by the fact that the machine is equipped with an F in series in the correction circuit by the processor unit for adjusting the ratio of the cutter and table speeds, phase discriminator, impulse o-channel, transducer and cyr-tf ipyioiiy-iM us-i; The tuning processor is connected to the output of the sensor — a spindle, one of the inputs to the Phase Discriminator is about to exit; naT4ii; a stop, and one of the inputs ycpnii those,:; - with the output of the block prazlan track.

The f-fa drawing shows a diagram of the control system for the BS cframe of the c-raM system;

For the drive and the manual case 1, use: -: engine 2, pack c) avil em Tirkstorn -1m conversion 3 To drive the table 4 slolz; engine 5, fll f ivii-jr; -; - rice TopHDJM converted; 3 ovatalem, TV i i / pi- tii; - yes the milling carriage used by the gs engine 7 with the transistor I-- by reference 8 ..

:: toit ;; Isolation transducers from the rudimentary spindle 9 and stele 10, processor 11-phase D1 speed: 1.2 gors, and Analogue-analog :: p :: obtsovateU1 13 and summing up - j yCi-jiHTel 1 4,

Control g: l-aodam; -1 MHCTDyivie H talnO spindle, crrrrrrrrrrrrrrrrrrrrrrrrrrr; By the connection of the module, implemented by the PI, low power consumption, for example, BT (not shown). The drive is also controlled from the CNC device. npjj when there is no correction, U signal; pu-gen signal uq; yiipabjiji-ouuifl irrzodom -gog-

The signal PI of the instrumental spin 10 div is fed to the input of the processor 11 configured on. the calculated ratio of the speeds of the cutter and the table, for helical gear:., worm or spur wheels.

As a result of the conversion of the input signal processor's block, the frequency of the signal on its output is equal to the frequency of the table's IP signal. The matching of the phase signals is performed by the phase discriminator, and the phase shift of two sequences of pulses of the same frequency applied to the PD input corresponds to

tic misalignment of the tool section and the machine table. With increasing mismatch, the pulse ratio at the output of the phase discriminator decreases. The output voltage of the pulse analog-to-analog converter 13 (correction signal and "), proportional to the average value of the signal at its input, is fed to the input of summing amplifier 14 and is added to the path signal

privo, gta table Ug.

The use of a processor unit that allows the calculated ratio between the speeds of the milling cutter

and cToJ-ia for both helical and liGpasr-ifibix and sprocket wheels, as well as the PI for the final links of the machine kinematic chains in the described system, the section allows you to significantly increase the accuracy of the wheels being processed for c-iT reaching precise synchronization of the milling cutter and the table of the machine with static and dynamic modes of machining. At the same time, no vyss-sie-requirements for permissive

the ability and accuracy to the PI, the implementation .B.nn.-Cii-KJ-- travel with the CNC, and, traces of the CNC, to the speed of the CNC device,

the invention

CNC gear milling machine, contains, -; a1tsny slykgronnuyu guitar dividing chain on the basis of an interpolator, sweet tooth, dy cutters, milling carriage and stl.a, block. Correction inaccurate mechanical transmission, including pulse measuring The pseudo-aerators installed on the milling spindle and the machine table, the travel control unit cTOJja, is based on the fact that, in order to improve the accuracy of machining of hard wheels, the machine is equipped with the cooT tuning processor included in the correction circuit; i ; e iHH cutter and stoker speeds, phase separator, pulse-analog converter and summing amplifier, the input of the tuning processor unit is connected to the output:. {spindle sensor, one of the phase discriminator inputs - with the output of the table sensor, and oh, from the amplifier inputs . - with the output of the track control unit,

Sources of information taken into account in the examination

1 Levitsky M, I. Corrective devices. Kiev, Technique, 1969.