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Cojinetes de deslizamiento de alto rendimiento y precisión y gran velocidad rotacional

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TOCZ20151215001
Publicado:
14/01/2016
Caducidad:
14/01/2017
Resumen:
Una universidad checa ha desarrollado cojinetes de deslizamiento activamente controlados que pueden utilizarse directamente en máquinas. Su sistema de control se conecta al sistema de control de la máquina para cumplir las funciones que no pueden realizarse con un cojinete estándar. El algoritmo de control y diseño mecánico del cojinete con piezoactuadores integrados están protegidos por patente. El sistema puede aplicarse en diferentes tipos de máquinas, como máquinas-herramientas, máquinas para cortar metal, maquinaria textil y otros equipos que utilizan rotores de alta velocidad. La universidad busca socios industriales con el fin de establecer acuerdos de cooperación técnica y fabricación.

Details

Tittle:
Actively controlled sliding bearings with high performance, precision and high rotational speed
Summary:
A Czech university developed an actively controlled journal bearing. Actively controlled sliding bearing can be used directly in the machines and its control system will be connected to the control system of the machine to fulfill the functions that are impossible in a standard bearing. The university is looking for partners from industrial sector for further technical cooperation and offers technical cooperation agreement and/or manufacturing agreement.
Description:
The system of actively controlled sliding bearing is the first known functional prototype in the world and was developed by the university from the Czech Republic. It works with a cylindrical bushing which does not require special precision of production and assembly. The control algorithm and mechanical design of the journal bearing with integrated piezoactuators are protected by patents.
Bearing bushing is in the casing supported by rubber "O" rings, but other elastic element can be used as well. Bearing bushing excitation is achieved by means of simple piezoactuators without casing, which provide compressive force. Force in opposite direction is provided by steel spring with stiffness similar to that of piezoactuator. Motion of the bearing bushing is controlled by the electronic controller, which responds to the change in position of the bearing journal sensed by a pair of capacitive sensors (accuracy less than 1 micrometer). In sophisticated systems the force acting on the bushing can be measured e.g. by strain-gage load cell.
The system can be applied in all different types of machines such as machine tools, metal cutting machines, textile machines, and many other machines that use high-speed rotors.
The university is looking for industrial partners for further development, testing, manufacturing and application of the system into the machines. The university offers technical cooperation and/or manufacturing agreement and is ready to share the knowledge and experience with system with possible partners.
Advantages and Innovations:
The disadvantage of the conventional hydrodynamic journal bearings is the excitation of vibration as the whirling motion of the journal and consequently instability after crossing a certain threshold rotational speed due to the oil film. A passive method of increasing region of stable operation consists in selecting suitable bearing geometry, such as lemon or elliptical bore, a pressure dam or tilting pads.
Operating speed range can be increased by use of active vibration control. The principle of active vibration control consists in using piezoelectric actuators to move the bearing housing in two directions.
The active vibration control extends the operating speed range from 2,000 rpm to 12,000 rpm. The system enables not only to damp vibrations, but also makes it possible to maintain the desired bearing journal position with the accuracy of micrometers. Dissipated power at 7000 rpm for a pair of the journal bearings is 66 W in an unstable state and power loss is only 48 W when active vibration control is switched on. Active vibration control reduces the friction losses of sliding bearings by 27%.
Stage of Development:
Prototype available for demonstration
IPs:
Patent(s) applied for but not yet granted,Patents granted
CommeR Statunts Regarding IPR Status:
One patent for the Czech Republic has been granted and two patents (EU) have been applied for.

Partner sought

Type and Role of Partner Sought:
The sought partner should be from industial sector such as metal cutting industry, textile industry or any other industry that use high-speed rotors in their machines. The partner should be ready for further development of the system, testing, and application of the system into the machines. There is also possible manufacturing of the systém.
The university offers technical cooperation and/or manufacturing agreement and is ready to share the knowledge and experience with system with possible partners.

Client

Type and Size of Client:
University
Already Engaged in Trans-National Cooperation:
Si
Languages Spoken:
Czech
English

Keywords

Technology Keywords:
01001001 Automation, Robotics Control Systems
05003001 Ingeniería acústica y vibracional
02002009 Machine Tools
02002010 Mecanizado (torneado, perforado, moldeado, fresado, cepillado, cortado)