SU996903A1 - Rolling-contact bearing assembly quality control method - Google Patents

Description

(54) QUALITY CONTROL METHOD FOR ASSEMBLING ROLL BEARINGS

one

The invention relates to the bearing industry and can be advantageously used to control the quality of the assembly of rolling bearings.

There is a known method for controlling the quality of rolling bearing assemblies, which includes creating damped oscillatory movements of the controlled bearing relative to its axis of rotation, accompanied by the appearance of acoustic emission signals in it, measuring the number of acoustic emission pulses, determining the average pulse intensity using them, comparing this intensity with reference bearing intensity 1.

However, the known method does not provide a defectoscopy of the bearings after the assembly of the track after rolling.

The aim of the invention is to improve the quality control by ensuring the inspection of bearings after assembly in the wake of rolling.

The goal is achieved by the fact that according to the method of controlling the quality of assembly of rolling bearings, including the creation of damped oscillatory movements

controlled bearing relative to its axis of rotation, accompanied by the appearance of acoustic emission signals in it, measuring the number of acoustic emission pulses, determining the average value of the intensity of the pulses and evaluating the quality of bearings by comparing it with the intensity of the reference bearing; For example, Q is exhausted for each half-period of damped oscillatory movement of the support.

FIG. 1 shows a diagram of an apparatus for carrying out the method; in fig. 2 is a graph of the change in the number of pulses of acoustic emission of CF for each half period T / 2 of the damped oscillation of the assembled substrates with the very clean and defect-free surface of the rolling elements; in fig. 3 - the same, bearings with the presence of small defects in the form of mechanical damage to the surface and contamination on the rolling track.

Claims (2)

A device that implements the method contains a 1 ,. fitted with a fastening unit on the rotor of the product 2, consisting of a sleeve 3 and a cap nut 4 of the collet chuck, a series-connected broadband converter 5, a piezoelectric amplifier 6 of electrical acoustic emission signals, a band-pass filter 7, a threshold device 8 and a recorder that includes a unit 9 for counting the total the number of pulses during the damping period and the recorder 10 recording the number of acoustic emission pulses for each half-period of damped oscillations of the sub-carriers. The method is carried out as follows. The chuck 1 is fastened with a collet chuck to the rotor of the test item. 2. Fastening is performed by tightening the cap nut 4 on the sleeve 3 attached to the pilot. 1. The barrel 1 is deflected from a vertical position at a certain angle and released to allow free oscillatory movement. When the reciprocating oscillatory movement of the tiller and movable elements of the controlled subgroup of the node occurs, energy is lost due to friction of the rolling bodies, on the processes of collisions of defects and microroughness of the surfaces of the rolling bodies and treadmills of the rings, etc., and hence the reciprocating oscillatory motion decreases. When the reciprocating motion of the moving elements of the subunit assembly of the product 2 is realized, acoustic emission signals are produced, which, via the sound conductor - the product rotor, arrive at the converter 5, which converts them into electrical signals being processed in a sequential chain of equipment 5, 7 and 8 and arriving in the form of pulses on the pulse counting unit 9 and the recorder 10. The recorder 10 records the decay curve of the number of pulses for each half-period of oscillation. The measured number of acoustic emission pulses for each half-period of damped oscillations of bearings and graphs establish the stability of the nature of the decay curve of the number of pulses for each half-period, according to which the quality of the surface of rolling bodies in the assembled bearings of the tested product is evaluated. With a smooth change in the ordinates of the recorded curve, which are equal to the number of acoustic emission pulses in each half-period of the damped oscillation, corresponding to the nature of the theoretical oscillation damping curve, the absence of defects in the rolling surfaces of the rolling track is determined. With a jump-like change in the ordinates of the recorded curve, which violates the character of the theoretical oscillation decay curve, the presence of defects on the surfaces of the rolling bodies of the assembled bearing is evaluated. Depending on the values of the deviation of the ordinates of the actual decay curve and the periodicity of the jump-like change of the ordinates, the degree of defectiveness of the controlled section of the working surfaces of the sub-bodies assembled in the product is determined. The positive effect of introducing the method is that the range of parameters for controlling the quality of the assembly is expanded to make it possible to detect the predominant type of defects in the surface of rolling elements of bearings directly in the finished product housings with a simple implementation scheme and using high-frequency acoustic waves of voltages as estimates, coming from bearing units and various low-frequency interferences emanating from the background. This increases the quality of control of the assembly of ball bearings, which is a prerequisite for increasing the reliability and durability of various rotary systems during their operation. Claims The method of controlling the quality of assembly of rolling bearings, includes creating damped oscillatory movements of a controlled bearing relative to its axis of rotation, accompanied by the appearance of acoustic emission signals in it, measuring the number of acoustic emission pulses, determining the average value of the pulse intensity and evaluating the bearing quality by comparing this intensity with the intensity of the reference subspace, characterized in that, in order to improve the quality of control by ensuring flaw detection on the rolling track; in the process of monitoring, the measurement of the number of acoustic emission pulses is carried out for each half-period of damped oscillatory movement of the subshell. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2917864 / 25-27, cl. G 01 M 13/04, 1980. (prototype). UH / Uffn fff liiiiiiiiii 11 tyCfH 2030 Fig.d