SU1013806A1 - Method of diagnostics of ball-bearing by moment characteristics thereof - Google Patents

Description

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The invention relates to the bearing industry and can be advantageously used for the diagnosis of ball bearings according to torque characteristics.

A known method for diagnosing ball bearings according to moment characteristics is that they register the moment of resistance to the rotation of the ball bearing Gt.

However, the known method does not allow to determine the nature and size of the bearing defects.

The aim of the invention is to improve the quality of diagnostics by determining the nature, size and location of rolling surface defects.

This goal is achieved due to the fact that according to the moment characteristics of the ball bearing diagnostics method, which records the moment of resistance of the ball bearing during forward and reverse rotation, the instantaneous values of the centered moment are measured during the registration of the moment as a function of the angle of rotation exceeding the threshold values , allocate parts of the curve that coincide in shape during forward and reverse rotation, the r. measure the angular step of repeating the like components, their amplitude, angle Their length, their shape is determined, and the location of the defect is determined by the angular repetition step, the shape of the character is determined, and the parameters of the defect are in amplitude and angular length.

FIG. 1 is a block diagram of an apparatus for carrying out the method; in fig. 2 - change of the moment of resistance to the rotation of the ball bearing in case of a defect - a protrusion on the channel of the test ball bearing; in fig. 3 - in case of defect - trough.

An apparatus for carrying out the method comprises a drive mechanism mounted on the base 1 consisting of the engine 7. with pinion gear 3 and the attachment device k and rotation 5 of the test bearing 6, as well as the loading mechanism, made in the form of a spring 7. connected by a torso 8 through a sleeve 9 with a bearing inner ring 6. A compensating type torque meter 10 consisting of a series-connected sensor

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11, the amplifier 12, the scale resistor 13 and the 1st torque sensor are connected by a driver 15 and plug 1b to the inner ring of the bearing 6 being tested. The device also includes a rotation angle bearing 6 sensor 17 connected to the gear 5 rotation device 18, the recorder 19, the first input which is connected to the output of the sensor

10 7 of the angle of rotation, and the second input through a series-connected high-pass filter 20 and a noise suppressor 21 with a scale resistor 13, and a control unit 22, the output of which is connected to the motor. 2 drive mechanism, and the input to the output of the angle sensor 17.

The method is carried out as follows.

The test bearing 6 is installed in the seat of the attachment device k and is loaded with an axial load transmitted through the sleeve 9 and the torSION B from the spring 7 of the loading mechanism. The outer ring of the bearing is rotated at low frequency by motor 2 through drive gear 3 and rotation device 5. Using the control unit 22, together with the angle sensor 17, an automatic cycle is provided, consisting of rotating the bearing 6 in one direction at a given angle of rotation, reversing, rotating in the opposite direction, at the same angle and stopping.

The moment of enthusiasm transmitted by the plug 16 and the leader 15 to the torque meter 10 is compensated by an electric spring. The current flowing through the scale resistor 13 is proportional to the measured torque of the rotational resistance (9 bearings 6. With the help of a high-pass filter, the significantly shifted instantaneous values of the moment are centered and, the passage of the squelch 21, enters the recorder only those values that specify certain threshold values, on which the suppressor of 21 noise is configured.

On the recorder 19, a centered impedance moment is recorded. Ball bearing bearing 6 as a function of the angle of rotation in forward and reverse rotation. When registering the moment on the same segment with forward and reverse rotation, the oscillations of the moment caused by rubbing or

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the frictional nature of the friction will not be the same, but due to the conservative nature will completely coincide. Selected portions of the curve that coincide in shape during forward and reverse rotation. The angular pitch of the repetition of like components, their amplitude A and angular extension are measured, their shape is determined, which depends on the nature of the defect. The angular pitch of the repetition e determines the location of the defect.

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according to the form, the character, and according to the amplitude A and the angular extent of the c.x, the parameters of the defect are determined — height (depth) and width.

The proposed method allows improving the quality of diagnostics of ball bearings, eliminating the subjectivity of assessing the quality of bearings and, O ultimately, improving the quality and reliability of the products to be completed with bearings.

-MBC -

FIG. 3. Forward to me. Reverse. Hanfla ff, reversal of FIG. 2

Claims (1)

, METHOD FOR DIAGNOSTIC BALL. OF BEARINGS BY TORQUE CHARACTERISTICS, which consists in the fact that they record the moment of resistance to rotation of the ball bearing in reverse rotation, with the direct and; To determine the quality of diagnostics by determining the nature, magnitude and location of defects of the rolling surfaces, when recording the moment, the instantaneous values of the centered moment as a function of the angle of rotation of the bearing, exceeding the threshold values, are measured, sections of the curve matching in shape during forward and reverse rotation are measured, and the angular the step of repetition of the components of the same name, their amplitude, angular extent, determine their shape 'and determine the location of the defect by the angular step of repetition, by: shape - character, and in amplitude and angular extent - parameters