CN101920470A

CN101920470A - Integrated monitoring ring device of machine tool spindle

Info

Publication number: CN101920470A
Application number: CN 201010244711
Authority: CN
Inventors: 朱永生; 洪军; 张优云; 寸花英; 孙薇; 张征凯; 张其东
Original assignee: Shenji Group Kunming Machine Tool Co Ltd; Xian Jiaotong University
Current assignee: Shenji Group Kunming Machine Tool Co Ltd; Xian Jiaotong University
Priority date: 2010-08-02
Filing date: 2010-08-02
Publication date: 2010-12-22
Anticipated expiration: 2030-08-02
Also published as: CN101920470B

Abstract

The invention discloses an integrated monitoring ring device of a machine tool spindle, comprising an angular contact bearing of a support principal axis. The angular contact bearing is provided with an inner ring spacer bush and an outer ring spacer bush, wherein the radial direction of the outer ring spacer bush is provided with three eddy current displacement sensors near the inner ring spacer bush along the peripheral direction; the axial direction is provided with one eddy current displacement sensor; the outer edge of the outer ring spacer bush is provided with an acceleration transducer and a temperature sensor; the inner ring spacer bush of the angular contact bearing rotates along with the principal axis in the operation process of the principal axis of the machine tool; four eddy current displacement sensors respectively monitor the axial and radial vibration displacement of the principal axis; the acceleration transducer monitors the vibration acceleration of the angular contact bearing; the temperature sensor monitors the temperature of the angular contact bearing; and finally, comprehensive analysis is carried out to judge the operation state of the principal axis and realize real-time on-lime monitoring of the operation state of the principal axis.

Description

A kind of integrated monitoring ring device of machine tool spindle

Technical field

The invention belongs to the machine tool chief axis monitoring technical field, be specifically related to a kind of a kind of integrated monitoring ring device of machine tool spindle of monitoring the radial displacement of lathe spindle vibration, axial displacement, bear vibration acceleration, bearing temperature and spindle rotation accuracy.

Background technology

High-accuracy lathe is used more and more widely in field of machining owing to high rotating speed, high accuracy, high efficiency and high flexibility, has increased powerful motivation to modern manufacturing industry, is the important foundation equipment of national economy.High-accuracy Machinery Tool Automation degree height costs an arm and a leg, and complex structure will be in case owing to fault or component failure stop, will cause the tremendous economic loss.Axis system is the parts of lathe most critical, and it participates in the machining of lathe directly by cutter, and the quality of its dynamic property all has very big influence to cutting vibration resistance, machining accuracy and the surface roughness of lathe.Therefore be necessary to consider the rational main shaft monitoring system of reliable design, realize monitoring the main shaft duty.

The main shaft of nowadays nearly all high speed rotation all press standard configuration sensor, in order to measure the temperature of bearing portion, the part lathe has also disposed axial and radial displacement sensor on main tapping, assembled vibrating sensor at bearing portion.The up-to-date electric main shaft of Switzerland DIXI company is concentrated and has been equipped with a plurality of sensors, degree of will speed up sensor and temperature sensor are installed in the circumferential slot of leaving on the rack sleeve, can near acceleration and the real-time cold oil temperature of monitoring main shaft bearing of close-in measurement main shaft bearing.The ISPI intelligence main axle unit project of the BMBF of German federal scientific research department has been installed many sensors and actuator on two test main shafts, so that gather the critical excitation of main shaft with sensing mode.But these sensors are to disperse to install mostly, and integration is not high, therefore may influence the reliability of monitoring result.The online main shaft health monitoring systems of the open framework of University of Massachusetts's development is arranged in sensor at the shell place of main shaft, though realize easily, but make sensor away from signal source, can make temperature, vibration signal in being delivered to the process of sensor, decaying, disturb and distort inevitably.Domestic Shanghai Communications University provides Digit Control Machine Tool acceleration and thermometric solution, but its mounting means is still for beat the method for a plurality of fabrication holes or magnetic absorption at the main shaft shell, in the further raising that awaits aspect integrated level and the reliability.Zhejiang University adopts intelligent temperature sensor and high-precision laser displacement transducer to measure the temperature of main shaft of numerical control machine tool relevant portion and the thermal deformation of main shaft respectively, its sensor dispersed placement is on front and back bearings of main shaft end cap and main shaft shell flange, the installation site is subjected to the restriction of machine tool type and might interferes with processing work, influences the working ability of lathe.The diagnosing faults of numerical control machine of Central South University and forecast system are arranged vibrating sensor respectively, are arranged temperature sensor, test the main shaft operating condition at main-axis end layout velocity sensor near the gear place at main-axis end and main shaft above main shaft bearing, the integrated DeGrain of this layout, reliability is not high.

All in all, the real-time measurement for machine tool chief axis both at home and abroad all takes much count of, and has designed multiple measurement scheme according to actual conditions, and still, mainly there is following problem in the machine tool chief axis monitoring system at present:

1, dispersed placement sensor, need be on main shaft perforate or groove, can influence main shaft sound rigidity;

2, sensing station is far away from the signal source distance, and decay and distortion take place vibration signal easily, cause measurement data can not reflect the actual motion state of main shaft effectively.

3, sensor is installed on the main shaft outside, and the installation site is restricted.

Summary of the invention

In order to overcome the defective of above-mentioned prior art, the object of the present invention is to provide a kind of integrated monitoring ring device of machine tool spindle, existing machine tool chief axis monitoring system dispersed placement sensor be can overcome and the far away and problems such as the vibration signal decay that causes and distortion in main shaft sound rigidity or sensing station distance signal source, the real time on-line monitoring of realization machine tool chief axis running status influences.

In order to reach above purpose, the present invention takes following technical scheme to be achieved:

A kind of integrated monitoring ring device of machine tool spindle, the angular contact bearing 2 that comprises supports main shaft 1, be provided with inner ring spacer 3 and outer ring spacer 4 in the angular contact bearing 2, it is characterized in that, outer ring spacer 4 is radially gone up along circumferencial direction and is furnished with three eddy current displacement sensors 5 near inner ring spacer 3 places, outer ring spacer 4 axially is provided with an eddy current displacement sensor 5, and the outer of outer ring spacer 4 is provided with acceleration transducer 6 and temperature sensor 7.

Described inner ring spacer 3 and outer ring spacer 4 profiles are the sleeve that an end has the shaft shoulder.

Inner ring spacer 3 in the angular contact bearing 2 with main shaft 1 rotation, therefore can be used as the test benchmark of main shaft diameter to vibration displacement in machine tool chief axis 1 running; Change inner ring spacer 3 into sleeve that an end has the shaft shoulder by original single form of sleeve, with shaft shoulder end face as the axial float test benchmark; Right bearing outer ring in the angular contact bearing 2 is as the test benchmark of the temperature of the vibration acceleration of angular contact bearing 2 and angular contact bearing 2.

The present invention compares with existing machine tool chief axis monitoring device, has the following advantages:

1, by integrated layout testing sensor on outer ring spacer 4, need not perforate or grooving on main shaft, can not influence main shaft sound rigidity.

2, testing sensor position distance test object main shaft 1 and angular contact bearing 2 positions are very near, and test signal decay and distortion level reduce greatly, and test result can more effectively reflect the actual motion state of main shaft.

3, the integrated monitoring ring centralized arrangement main shaft diameter to vibration displacement sensor, main shaft diameter to vibration displacement sensor, bear vibration acceleration transducer, main shaft temperature sensor, can monitor a plurality of state parameters of main shaft operation simultaneously, significantly improve the integrated level of main shaft monitoring.

Description of drawings

Fig. 1 is a structural representation of the present invention,

Fig. 2 is that the A-A of Fig. 1 is to cutaway view.

Fig. 3 is the schematic diagram of inner ring spacer 3 and outer ring spacer 4.

The specific embodiment

Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are described in detail.

With reference to Fig. 1, a kind of integrated monitoring ring device of machine tool spindle, comprise the angular contact bearing 2 of supports main shaft 1, be provided with inner ring spacer 3 and outer ring spacer 4 in the angular contact bearing 2.

With reference to Fig. 1, Fig. 2, outer ring spacer 4 is radially gone up along circumferencial direction and is furnished with three eddy current displacement sensors 5 near inner ring spacer 3 places, the radial vibration displacement of monitoring main shaft 1; Outer ring spacer 4 is furnished with an eddy current displacement sensor 5 on axially, and the axial vibration displacement of test inner ring spacer 3 is as the axial float of main shaft; Outer ring spacer 4 is installed a high-precision micro three-dimensional acceleration transducer 6, the vibration acceleration of 2 three directions of test angles contact bearing near place, the left bearing outer ring in the angular contact bearing 2 fluting; Outer ring spacer 4 is installed a miniature high-precision platinum resistance sensor 7 near place, the left bearing outer ring in the angular contact bearing 2 fluting, is used for the temperature of test angles contact bearing 2.

With reference to Fig. 3, described inner ring spacer 3 and outer ring spacer 4 profiles are the sleeve that an end has the shaft shoulder.The shaft shoulder of inner ring spacer 3 is as the test benchmark of axial vibration displacement, and the shaft shoulder of outer ring spacer 4 is in order to increase the space of placement sensor.

Operation principle of the present invention is: the inner ring spacer 3 in the angular contact bearing 2 rotates with main shaft 1 in machine tool chief axis 1 running, the radial vibration displacement and the axial vibration displacement of four eddy current displacement sensor 5 monitoring main shafts 1, the vibration acceleration of acceleration transducer 6 monitoring angle contact bearings 2, and the vibration acceleration signal by diametrical connection contact bearing 2 carries out follow-up signal and handles the state that reflects angular contact bearing; Temperature sensor 7 monitoring angle contact bearing temperature, thereby reflection main shaft running status.By spindle vibration displacement signal, bear vibration acceleration signal and the bearing temperature signal that integrated monitoring ring obtains, differentiate the main shaft running status thereby carry out analysis-by-synthesis.

Claims

1. integrated monitoring ring device of machine tool spindle, the angular contact bearing (2) that comprises supports main shaft (1), be provided with inner ring spacer (3) and outer ring spacer (4) in the angular contact bearing (2), it is characterized in that, radially go up along circumferencial direction at outer ring spacer (4) and to locate to be furnished with three eddy current displacement sensors (5) near inner ring spacer (3), outer ring spacer (4) axially is provided with an eddy current displacement sensor (5), and the outer of outer ring spacer (4) is provided with acceleration transducer (6) and temperature sensor (7).

2. a kind of integrated monitoring ring device of machine tool spindle according to claim 1 is characterized in that, described inner ring spacer (3) and outer ring spacer (4) profile are the sleeve that an end has the shaft shoulder.