Method of testing roll bearing races

FIELD: testing engineering.

SUBSTANCE: method comprises rotating one of the races of a lubricated bearing with the operational speed, circulation radial loading of the race to be tested with operation speed, and loading the untested race locally.

EFFECT: enhanced reliability.

4 dwg

 

The invention relates to the field of measurement technology and can be advantageously used for quality control of the raceways of the bearings installed in the node, when performing mechanical work in the process of manufacture and repair of machines and mechanisms.

Known methods of quality control of the bearing, namely, that load lubricated bearing, rotate one of his rings and measure the parameters of fluctuating conductivity of the bearing, the values which evaluate its quality, in particular the quality of the raceways of the rings. In the known method [1] measured values of capacity fluctuations of the electric current flowing through the bearing connecting rings to a source of electrical voltage, in two equal width frequency ranges with different initial frequencies, and the quality of the bearing is judged by the difference of the measured values of capacity. In the known method [2] for quality control measure the average value of the normalized integral time (NIV) electrical contact in the bearing.

A disadvantage of known methods is that they provide only averaged a comprehensive assessment of the quality of the bearing as a whole, but do not allow selection of information about the state of its individual parts.

The closest in technical the second entity to the claimed method of the same purpose is the way, namely, that rotating one of the rings lubricated bearing with an operating frequency, create a radial circulation controlled loading ring with an operating frequency and local loading uncontrolled rings, measure the rotational speed of the separator and the RMS value of the harmonic components of the diagnostic parameter at frequencies Fand=Fc·Z+Fto·M·L, where Ftothe rotational speed of the ring; Fcthe rotational speed of the separator; Z is the number of rolling elements in the bearing; M is a numerical factor, which is chosen equal to 2 when assessing the ovality and equal to 3, 4,... in assessing the cut of the corresponding order; L is the numerical factor [3].

In the known method as a diagnostic parameter use the normalized integral time (NIV) electrical contact in the bearing (K), the RMS value of the harmonic components of the diagnostic parameter (KF) measured values of the coefficient of L equal to 1 or 2, depending on the desired range of the estimated deviations from roundness, are also measured the mean value of the variable component of the diagnostic parameter (Kabout), and on deviations from roundness raceway controlled ring represented by the relation . This method is adopted for the prototype.

For reasons that impede the achievement of specified following technical result when using known, taken as a prototype of the method is the following. The normalized integral time electrical contact is an effective diagnostic option only when bearing in mixed conditions (plugincontrol) lubrication. Regardless of the condition of the bearing during its work in the conditions of a liquid lubricant (typical for high-quality high-speed bearings) is NEVE becomes zero, and in conditions of boundary lubrication (typical for low-speed bearings) NIV becomes equal to the unit. In both cases, the control method unusable. Thus, the use, taken as a prototype of the known control method and its reliability when carrying out Assembly works limited.

The present invention solves the problem of extending the scope and improving the reliability of quality control rings mounted in the bearing when carrying out Assembly works. The technical result - estimate formed during Assembly of the bearing unit regular deviations from roundness of the raceways of the bearing rings operating at any lubrication regime.

This result DOS is ikaetsya fact, in a known method of controlling the quality of the raceways of the bearing rings swing, which consists in the fact that rotating one of the rings lubricated bearing with an operating frequency, create a radial circulation controlled loading ring with an operating frequency and local loading uncontrolled rings, measure the rotational speed of the separator and the RMS value of the harmonic components of the diagnostic parameter at frequencies Fand=Fc·Z+Fto·M·L, where Ftothe rotational speed of the ring; Fcthe rotational speed of the separator; Z is the number of rolling elements in the bearing; M is a numerical factor, which is chosen equal to 2 when assessing the ovality and equal to 3, 4,... in assessing the cut of the corresponding order; L is a numeric coefficient, according to the invention as a diagnostic parameter, use the electric resistance of the bearing (R), the RMS value of the harmonic components of the diagnostic parameter (Randmeasure at frequencies Fandwhen the numeric value of the coefficient L, is equal to three, additionally measure the RMS value of the harmonic component of the diagnostic parameter (Rn) at the frequency Fn=Fc·Z, and on deviations from roundness raceway controlled ring judge otnosheniy .

The invention is illustrated by drawings. Figure 1 presents a diagram of the device for implementing the method; figure 2 - example of embodiment of the loading device; figure 3 is obtained dependencefrom the value of ovality raceway controlled outer ring of the bearing type 306 illustrating an example implementation of the method; figure 4 - dependenceandfrom the value of ovality raceway controlled outer ring of the bearing type 306, illustrating the highest sensitivity of the proposed method in comparison with the prototype.

The inner ring of the monitored bearing 1, the loaded radial force using the loading device 2 mounted on the shaft 3 Assembly, the outer ring in the housing 4. The device includes a source 5 of an electrical voltage, one pole of which is through the transducer 6 resistance in the voltage and the current collector 7, the shaft 3 is connected to the inner bearing ring 1, and the other pole connected to the outer ring of the bearing 1. The output of the Converter 6, the resistance in the voltage connected to the amplifier 8, the output of which through narrow-band filters 9 and 10 is connected with the inputs of the quadratic detectors 11 and 12. The outputs of the detectors 11 and 12 are connected to input the am Converter 13 relations, the output signal of which is fed to the input device 14 of the display. Primary transducer gauge of frequency of rotation 15 is located in the immediate vicinity of the cage of the bearing 1. The loading device 2 may be performed, for example, in a device of the imbalance, which represents the load 16 fixed to the disc 17, which, in turn, installed by a coupling 18 to the shaft 3.

The method is as follows. With the shaft 3 rotate the inner ring of the test bearing 1 with an operating frequency Ftoand the loading device 2 creates a radial circulation controlled loading ring with an operating frequency and local loading uncontrolled rings. When controlling the rotating inner ring of the clutch 18 can be disconnected and the device of imbalance that are not in engagement with the shaft 3, creates a constant in magnitude and direction of the radial force. In this case, the controlled inner ring feels circulation loading with frequency Ftoand uncontrolled external - local. When you control a stationary outer ring enabling coupling 18 provide engagement of the drive device 17 imbalance with the shaft 3. The disk 17 rotates together with the load 16, creates a circulation controlled loading of the outer ring with an operating frequency Ftoand local is agrogene uncontrolled inner ring of the test bearing 1.

The gauge of frequency of rotation 15 measure the rotational speed of the separator Fcthe bearing. Depending on the type of estimate deviations from roundness raceway controlled ring select values of a numeric factor M: M=2 when assessing the ovality; M=3, 4,... in assessing the cut of the corresponding order. Then determine the required values of frequency Fandand Fnfrom the expressions: Fand=Fc·Z+Fto·M·L; Fn=Fc·Z, taking L=3. Configure narrowband filter 9 at the frequency Fnand a narrow-band filter 10 frequency Fandand measured by the measuring circuit, consisting of blocks 5-12, the RMS value of the harmonic components of the electric resistance of the bearing Rnand Randat frequencies of, respectively, Fnand Fand. About as raceways controlled ring represented by the relationdetermined by the Converter relations 13 and display unit 14 of the display.

Consider the process of measuring RMS values of the harmonic components of the electric resistance of the bearing Rnand Randand relationships. When the rotating ring of the bearing, the raceway which is the deviation from roundness, electric with the opposition between the rings of the bearing is continuously changing. When this function changes the electrical resistance of the bearing in time contains harmonics, whose frequencies are determined by the period of the deviation from roundness raceway controlled ring. Converter 6 resistance voltage generates an electrical signal proportional to the electrical resistance of the bearing 1, which is scaled in the amplifier 8 in accordance with the ranges of input signals subsequent blocks. The output signal of the amplifier 8 is supplied through a configured frequency Fnnarrowband filter 9 to the input of a quadratic detector 11, the output of which is proportional to the square of the RMS value of the harmonic component of frequency Fnan electrical signal generated by the amplifier 8, and, accordingly, proportional to the square of the RMS value of the harmonic component of the electrical resistancebearing 1. The output signal from the amplifier 8 is supplied through tuned to the frequency Fandnarrowband filter 10 to the input of a quadratic detector 12, the output of which is proportional to the square of the RMS value of the harmonic component of frequency Fandan electrical signal generated by the amplifier 8, and, for the NGOs, proportional to the square of the RMS value of the harmonic component of the electrical resistancebearing 1.

The output signals of two detectors 11 and 12 are received at the inputs of the Converter 13 that generates an electrical signal proportional toThe output signal of the inverter 13 relationship to the input device 14 display, which displays in a form readable by the operator.

When creating a circulation radial loading controlled ring and local uncontrolled loading ring in the loading zone when bearing fall in different parts of the raceway controlled ring and the same plot raceway uncontrolled rings. The presence of regular deviations from roundness real raceways controlled ring leads to the fact that the nature of the interaction of roller bearings with rings constantly changing. The result is a periodic change of film thickness in areas of friction and, accordingly, a function of the change in the electrical resistance of the bearing in time and its numerical characteristics, allowing to estimate the type and the quantitative value of deviations from roundness real raceways con is controlled ring.

The function of the electrical resistance of the bearing over time is complex. However, as the research showed, in the absence of regular macroorganisms of raceways this function contains practically only one significant harmonic component with frequency Fn=Fc·Z. depending on the form of deviations from roundness raceway controlled ring in functions of resistance arise characteristic harmonic components at frequencies Fanddetermined by the formula above. The weight of the characteristic harmonic components in the total spectrum function electric resistance of the bearing is increased deviations from roundness increases significantly (several times). This allows by the corresponding frequency Fandand definitions according to the invention the values ofto establish the presence and estimate the value of specific deviations from roundness raceway controlled ring mounted in the bearing set.

Example. Monitored the outer ring of the rolling bearing type 306 (GOST 8338-75), greased grease lithol-24 (GOST 21125-87). With the help of the device constructed according to the principle described in [4], simulated deviations from roundness track kachani the outer ring in the form of ovality different values. Rotate the inner ring with a frequency of 900 rpm-1that corresponds to Fto=15 Hz. Due to the imbalance of the shaft created radial circulation loading of 3000 N controlled outer ring and the local uncontrolled loading of the inner ring. Measured rotational speed of the separator Fc=5.7 Hz. To assess the ovality in a wide range with regard to Z=8 chose the values of the numerical coefficients M=2, L=3 and calculated values of frequency Fand=135,6 Hz, Fn=45,6 Hz. Then simulated for different values of the ovality of the outer ring, for each value of the measured RMS value of the harmonic components of the electric resistance of the bearing at frequencies Fn=45,6 Hz and Fand=135,6 Hz and determined the value of the ratio, which was judged on ovality raceway controlled ring.

The obtained graph(the K-factornfrom the ovality of the outer ring of the monitored bearing confirms the feasibility and efficacy evaluation of deviations from roundness of the raceways of the rings installed in the bearing by the proposed method. For comparison, the graphs of dependency relations(obtained by the proposed method) and relations (obtained by the method prototype for L=1 and L=2) from the value of ovality raceway controlled outer ring of the bearing, illustrating the greater sensitivity of the proposed method in comparison with the prototype.

The proposed method thus provides regular assessment of deviations from roundness real raceways of the bearing at high sensitivity. However, in contrast to diagnostic parameter NIV, the electrical resistance does not lose sensitivity to the values of the deviations from roundness raceway controlled ring with liquid and boundary lubricants in the bearing, which broadens the scope and increases the reliability of the quality control rings mounted in the bearing rolling elements when carrying out Assembly work in process manufacturing and repair of machines.

Sources of information

1. USSR author's certificate No. 1176197, MKI G 01 M 13/04 was investigated. The method of controlling the quality of the bearings [Text] / Isidovsky and others, 1984.

2. Korndorf SF ABOUT the possibility of flaw detection in non-separable bearings electrical method [Text] / Svornost, Cowpasture // Defectoscopy, 1985. - N5. - P.88-90.

3. Patent 2154264 RF, MKI G 01 M 13/04 was investigated. The method of controlling the quality of rolling bearings rings [Text] / Cowpastures, VII. - Publ. 10.08.200, BIPM No. 22. the prototype.

4. Apprentices C.V. Electroflocculation methods of the complex diagnostics of linear guides [Text]. - M.: mechanical engineering 1, 2001. - S.

Method of quality control rings of the rolling bearing, which consists in the fact that rotating one of the rings lubricated bearing with an operating frequency, create a radial circulation controlled loading ring with an operating frequency and local loading uncontrolled rings, measure the rotational speed of the separator and the RMS value of the harmonic components of the diagnostic parameter at frequencies Fand=Fc·Z+Fto·M·L, where Ftothe rotational speed of the ring; Fcthe rotational speed of the separator; Z is the number of rolling elements in the bearing; M is a numerical factor, which is chosen equal to 2 when assessing the ovality and equal to 3, 4,... - when assessing the cut of the corresponding order; L is a numeric coefficient, characterized in that as a diagnostic parameter, use the electric resistance of the bearing (R), while the RMS value of the harmonic components of the diagnostic parameter (Randmeasure at frequencies Fandwhen the numeric value of the coefficient L, is equal to three, additionally measure the RMS value of the harmonic component of the diagnosis is practical parameter (R and) at the frequency Fn=Fwith·Z, and on deviations from roundness raceway controlled ring represented by the relation.



 

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