SU954196A1

SU954196A1 - Apparatus for limiting vibration in metal cutting machine

Info

Publication number: SU954196A1
Application number: SU802939618A
Authority: SU
Inventors: Николай Александрович Стрельцов; Андрей Вячеславович Софрышев; Николай Николаевич Попов; Владимир Игоревич Беляков
Original assignee: Предприятие П/Я А-1450
Priority date: 1980-06-09
Filing date: 1980-06-09
Publication date: 1982-08-30

Description

1one

Изобретение относитс к металлообработке , в частности к устройствам дл ограничени вибраци(7, возникающих при резании.The invention relates to metal working, in particular, to devices for limiting vibration (7 arising from cutting.

Известно устройство, в котором ограничение вибраций в системе станок-приспособление-инструмент-деталь при резании осуществл етс за.счет уменьшени в процессе резани величины подачи или (и) скорости резани .A device is known in which the limitation of vibrations in a machine-tool-tool-part system during cutting is accomplished by reducing the feed rate and / or the cutting speed during the cutting process.

Наиболее близким по технической сущности к предлагаемому устройству вл етс устройство, содержащее усилитель с управл емой зоной нечувствительности , вход которого подключен к датчику вибраций,его управл ющий вход - к задатчику допусти мого уровн вибраций, а его выход к системе управлени приводом подачи.The closest in technical essence to the proposed device is a device containing an amplifier with a controlled dead band, the input of which is connected to the vibration sensor, its control input to the setter of the permissible vibration level, and its output to the feed drive control system.

Устройство непрерывно анализирует уровень вибраций и как только этот уровенв превысит некоторое пороговое значение , определ емое сигнаЛОМ с выхода задатчика допустимого уровн вибраций, вырабатывает на выходе усилител с управл емой зоной нечувствительности.сигнал, который воздейству на вход системы управлени приводом подачи, уменьшает подачу до тех пор, пока уровень вибраций не уменьшитс ниже допустимогоМ .The device continuously analyzes the level of vibrations and, as soon as this level exceeds a certain threshold value determined by the signal from the output of the setpoint permissible vibration level, it produces an amplifier with a controlled dead zone. The signal that affects the input of the feed drive control system reduces the feed to those until the level of vibrations decreases below acceptable.

Недостатками устройств вл ютс The drawbacks of the devices are

10 ограниченна область применени , так как ограничение вибраций за счет уменьшени подачи возможно лишь при скорост х вращени шпиндел меньше некоторого критического значени , 10 limited scope, since the limitation of vibrations by reducing the feed is only possible at spindle speeds less than a certain critical value,

15 а при скорост х превышающих это значение , уменьшение подачи может не только не снизить уровень вибраций, а наоборот повысить его и снижение производительности обработки за счет 15 and at speeds exceeding this value, reducing the feed rate can not only reduce the level of vibrations, but, on the contrary, increase it and decrease the processing performance due to

20 уменьшени подачи.20 feed reduction.

Claims

The purpose of the invention is to expand the field of application of the device and improve processing performance. The goal is achieved by the fact that a device for limiting vibration on metal cutting machines, containing a vibration sensor and a vibration tolerance level adjuster, connected by outputs to the corresponding amplifier inputs with a controlled deadband and a feed drive, a comparison unit, an inverter and a switch in series, are inserted. Also, the spindle rotation speed sensor and the critical speed controller of the spindle (puppy spindles, outputs connected to the corresponding inputs of the comparison unit, the output of which is It is connected to the second input of the switch connected to the feed drive and the third input to the input of the inverter and to the output of the amplifier with a controlled deadband. The drawing shows the circuit diagram of the device.The device contains a vibration sensor 1, an amplifier 2 with a controlled deadband, setpoint 3 of permissible vibration level, inverter 4, switch 5, feed drive 6, setpoint 7 of the critical spindle rotational speed, comparison unit 8, spindle rotational speed sensor 9 kinematically connected with the spindle. 10. Device work melts follows. If the level of vibrations, and, consequently, the signal from the output of sensor 1 is less than the value of the dead zone of amplifier 2, the signal at the output of amplifier 2 is zero. Therefore, the signals at the output of the inverter t and at the output of the switch are equal to zero; 5- At the same time, the drive 6 provides a constant feed value (for example, with a frame). If the rotational speed of the spindle is more critical, and the vibration level has exceeded the critical value, the signal produced by the sensor 9 by its connected spindle 10, fed to one input of block 8, is greater than the signal sent to its other input C of the setting device 7, resulting in a signal at the output of the unit 8 such that switch 5 switches to a mode when, at its output, the signal arriving at its first input passes without changing. When the output signal amplifies l 2 when the permissible vibration level is exceeded, it passes through the inverter l and switch 5 and enters the input of the feed drive 6, which increases the feed until the vibration level drops below the permissible level. Simultaneously with the limitation of vibrations, with an increase in feed, the processing performance is also increased. The application of the proposed device allows to effectively limit vibrations and increase the productivity of processing on metal-cutting machines. Apparatus of the invention for limiting vibrations on metal-cutting machine tools, comprising a vibration sensor and a setter of permissible vibration level, connected by outputs to the corresponding inputs of an amplifier with a controlled deadband, and a feed drive, characterized in that, in order to expand the field of application of the device, a comparator unit, an inverter and a switch in series, as well as a spindle rotation speed sensor and a spindle critical speed master, outputs connected to to the corresponding inputs of the coping unit, the output of which is connected to the BTopbiM input of the switch connected to the output drive and the third input to the input of the inverter and to the output of the amplifier with a controlled deadband. Sources of information, taken into account in the examination 1. USSR author's certificate number 662319, cl. 23 Q 15/00, 1979.

2. Patent of Germany No., cl. 49 m 15/00, published 1971 (prototype).