JP2008032681A - Rolling device part inspection method and rolling device part inspection device - Google Patents

Abstract

A rolling device component capable of accurately inspecting whether or not a defect such as a ground exists in the rolling device component without being affected by foreign matter adhering to the surface of the rolling device component. Provide inspection methods.
When an electromagnetic induction sensor 11 inspects whether or not a defect such as a ground exists inside a rolling device part, a foreign matter removing member 17 is lightly pressed against the surface of the rolling device part to cause rolling. The presence or absence of a defect is inspected while removing the foreign matter 19 adhering to the surface of the device component before the electromagnetic induction sensor 11 by the foreign matter removing member 17.
[Selection] Figure 3

Description

  The present invention relates to a method and an apparatus for inspecting parts of a rolling device such as a rolling bearing, a ball screw, and a linear motion guide bearing device.

In general, steel bars used as rolling element materials or bearing ring materials for roller bearings are produced by rolling a steel material. For this reason, defects such as earth are often present inside the steel bar. Therefore, when steel bars are used as the rolling element material or the bearing ring material of a roller bearing, defects such as earth are often found inside the steel bar. It is necessary to check whether or not it exists.
When inspecting whether or not a defect such as ground exists in the steel bar, it is conceivable to inspect the presence or absence of the defect by electromagnetic induction while rotating the steel bar around the axis. Moreover, it is applicable also to the member which gave the grinding process which shape | molded these raw materials into forging etc., and the pre-processing before super-finishing process. Furthermore, it can be applied to parts after grinding or superfinishing.

However, when the presence or absence of defects is inspected by electromagnetic induction while rotating the steel bar around its axis, it is difficult to accurately detect the defects present inside the steel bar if foreign matter adheres to the surface of the steel bar. There is a problem of becoming.
In addition, as a method for inspecting whether or not a defect such as ground exists in the rolling device part, there is an inspection method using ultrasonic flaw detection (see, for example, Patent Document 1). However, this inspection method requires an ultrasonic transmission medium such as oil or water to be interposed between the ultrasonic flaw detection probe and the surface to be inspected. There are problems such as incurring a rise.
JP 11-337537 A

  The present invention has been made paying attention to the above-mentioned problems, and the purpose of the present invention is to prevent defects such as ground from appearing inside the rolling device part without being affected by foreign matter adhering to the surface of the rolling device part. An object of the present invention is to provide a rolling device component inspection method and a rolling device component inspection device capable of accurately inspecting whether or not they exist.

  In order to achieve the above object, an inspection method for a rolling device part according to the first aspect of the present invention is applied to an excitation coil for applying an alternating magnetic field to the rolling device part, and from this excitation coil to the rolling device part. An electromagnetic induction sensor having an induction coil for detecting a change in magnetic flux density of an alternating magnetic field is used, and on the surface or inside of the rolling device component while relatively moving the rolling device component and the electromagnetic induction sensor. A method for inspecting a rolling device part for inspecting any of existing defects, surface hardness, quenching depth, metallographic change, and mixing of different materials, and the rolling device part when inspecting the rolling device part The tip of the foreign material removing member is lightly brought into contact with the surface of the rolling device, and the rolling device component is inspected while the foreign material adhering to the surface of the rolling device component is removed by the foreign material removing member before the electromagnetic induction sensor. The features.

A rolling device part inspection method according to a second aspect of the present invention is the rolling device part inspection method according to the first aspect, wherein the foreign matter removing member is an elastic body.
A method for inspecting a rolling device part according to a third aspect of the present invention is the method for inspecting a rolling device part according to the second aspect, wherein the elastic body is any one of a brush, urethane, rubber, and plastic. And

  According to a fourth aspect of the present invention, there is provided a rolling device component inspection method comprising: an exciting coil that applies an alternating magnetic field to the rolling device component; and a change in magnetic flux density of an alternating magnetic field applied from the exciting coil to the rolling device component. A defect present on the surface or inside of the rolling device component, surface hardness, while relatively moving the rolling device component and the electromagnetic induction sensor, using an electromagnetic induction sensor having an induction coil for detecting A rolling device component inspection method for inspecting any of quenching depth, metallographic change, and mixing of different materials, wherein the tip surface of the electromagnetic induction sensor has a shape that matches the surface shape of the rolling device component It is characterized by.

According to a fifth aspect of the present invention, there is provided a method for inspecting a rolling device part according to the fourth aspect, wherein the electromagnetic induction sensor and the rolling device component have a magnetic field line of an alternating magnetic field in the rolling direction. Each shape is defined so as to be 90 degrees with respect to the device parts.
The rolling device part inspection method according to claim 6 is the rolling device component inspection method according to any one of claims 1 to 5, wherein the material of the rolling device part is a steel bar. It is characterized by.

The inspection method for a rolling device part according to the invention of claim 7 is the rolling device component inspection method according to any one of claims 1 to 5, wherein the member to be detected is forged by a member as a material. It is a member formed as a rolling device part.
The rolling device part inspection method according to claim 8 is the rolling device component inspection method according to any one of claims 1 to 5, wherein the detected member is ground or processed as the rolling device part. It is a superfinished member.

  According to a ninth aspect of the present invention, there is provided a rolling device component inspection method comprising: an exciting coil for applying an alternating magnetic field to the rolling device component; and a change in magnetic flux density of an alternating magnetic field applied from the exciting coil to the rolling device component. A defect present on the surface of or inside the rolling device component while moving the rolling device component and the electromagnetic induction sensor relative to each other, surface hardness, A method for inspecting a rolling device part for inspecting any of quenching depth, metallographic change, and mixing of different materials, and when inspecting the rolling device part, a tip of a foreign matter removing member on the surface of the rolling device part And inspecting the rolling device component while removing foreign matter adhering to the surface of the rolling device component before the electromagnetic induction sensor by the foreign material removing member, and the electromagnetic induction sensor Characterized in that the distal end surface and to perform testing in accordance with the surface shape of the rolling device parts.

  A rolling device part inspection method according to a tenth aspect of the present invention is the rolling device component inspection device used in the inspection method according to the first aspect, wherein the exciting coil applies an alternating magnetic field to the rolling device component. And an induction coil for detecting a change in magnetic flux density of an alternating magnetic field applied to the rolling device component from the excitation coil, and the amplitude and phase of the induced electromotive force generated in the induction coil A data processing unit that measures at least one of the change amounts, and a determination unit that compares the output of the data processing unit with a threshold and determines pass / fail are provided.

  A rolling device part inspection method according to an eleventh aspect of the present invention is the rolling device component inspection device used in the inspection method according to claim 4, wherein the exciting coil applies an alternating magnetic field to the rolling device component. And an induction coil for detecting a change in magnetic flux density of an alternating magnetic field applied to the rolling device component from the excitation coil, and the amplitude and phase of the induced electromotive force generated in the induction coil A data processing unit that measures at least one of the change amounts, and a determination unit that compares the output of the data processing unit with a threshold and determines pass / fail are provided.

  A rolling device part inspection method according to a twelfth aspect of the present invention is the rolling device component inspection device used in the inspection method according to claim 9, wherein the exciting coil applies an alternating magnetic field to the rolling device component. And an induction coil for detecting a change in magnetic flux density of an alternating magnetic field applied to the rolling device component from the excitation coil, and the amplitude and phase of the induced electromotive force generated in the induction coil A data processing unit that measures at least one of the change amounts, and a determination unit that compares the output of the data processing unit with a threshold and determines pass / fail are provided.

  According to the present invention, since the foreign matter adhering to the surface of the rolling device part is removed by the foreign matter removing member before the electromagnetic induction sensor, the inspection accuracy is reduced by the foreign matter attached to the surface of the rolling device component. Can be prevented. In addition, it is not necessary to use ultrasonic flaw detection when inspecting whether defects such as ground exist inside the rolling device parts, and it is not necessary to clean the rolling device parts after the inspection. Thus, it is possible to accurately inspect the rolling device parts without increasing the inspection cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration of a rolling device part inspection device according to a first embodiment of the present invention. The rolling device component inspection device shown in FIG. 1 includes an exciting coil 2 that applies an alternating magnetic field to an object to be measured 1 such as a rolling device component, and an impedance change detection circuit that detects an impedance change amount of the exciting coil 2. (Data processing unit) 3 and a determination device (determination unit) 4 that determines the presence or absence of a defect or the like by comparing the impedance change amount of the exciting coil 2 detected by the impedance change detection circuit 3 with a preset threshold value. And a display device 5 for displaying the determination result of the determination device 4. The determination device 4 is a rolling device component when the impedance change amount of the exciting coil 2 detected by the impedance change detection circuit 3 is larger than a threshold value. It is configured to determine that there is a defect such as ground in the inside of the.

Further, the rolling device part inspection device according to the first embodiment includes a recording device 6, and the determination result of the determination device 4 is recorded on a recording medium such as recording paper by the recording device 6. Yes. In FIG. 1, reference numeral 7 denotes an AC power source for supplying an AC current to the exciting coil 2.
When inspecting whether or not there is a defect such as a ground in the rolling device part using the rolling device part inspection apparatus configured as described above, first, the surface of the rolling device part is excited. When the coil 2 is brought close and an alternating current is supplied from the alternating current power source 7 to the exciting coil 2 in this state, the exciting coil 2 enters an excited state, whereby an alternating magnetic field is applied from the exciting coil 2 to the rolling device components. At this time, the magnetic flux density of the alternating magnetic field applied to the rolling device component changes according to the size of the defect existing inside the rolling device component, and the impedance of the exciting coil 2 depends on the magnetic flux density of the alternating magnetic field. Change.

  Therefore, by measuring the impedance change amount of the exciting coil 2 with the impedance change detection circuit 3 and comparing the measured value with a preset threshold value, is there a defect such as ground in the rolling device component? It is possible to accurately inspect whether or not. Therefore, there is no need to interpose an ultrasonic transmission medium such as oil or water between the ultrasonic inspection probe and the surface to be inspected, as in the case of using ultrasonic inspection as a method for detecting defects such as ground. Since the cleaning process after the inspection becomes unnecessary, the increase in the inspection cost can be suppressed.

  Next, FIG. 2 shows a schematic configuration of a rolling device part inspection device according to a second embodiment of the present invention. The inspection apparatus for rolling device parts shown in the figure is an excitation coil 11a for applying an AC magnetic field to the object to be measured 1 such as a steel bar, and the magnetic flux density of the AC magnetic field applied to the object to be measured 1 from the excitation coil 11a. An induction coil 11b for detecting a change is provided, and both the coils 11a and 11b are housed in one housing to constitute the electromagnetic induction sensor 11.

  In addition, the rolling device component inspection apparatus according to the second embodiment has an inductance change detection circuit (data processing unit) 12 that detects an inductance change of the induction coil 11b (the magnitude of the induced electromotive force generated in the induction coil 11b). And a determination device 13 as a determination unit that determines the presence or absence of a defect by comparing the inductance change of the induction coil 11b detected by the inductance change detection circuit 12 with a preset threshold value, and the determination result of the determination device 13 In the determination device 13, if the amplitude change amount or phase change amount of the induced electromotive force generated in the induction coil 11 b is larger than the threshold value, a defect exists in the DUT 1. It is configured to determine.

Furthermore, the rolling device part inspection device according to the second embodiment includes a recording device 15, and the determination result of the determination device 13 is recorded on a recording medium such as a recording sheet by the recording device 15. Yes.
FIG. 3 is a diagram for explaining a method for inspecting whether or not there is a defect in a steel bar used as a rolling element material or a bearing ring material of a cylindrical roller bearing by an electromagnetic induction sensor. The inspection method according to the present invention will be described with reference to the drawings.

  When inspecting whether or not there is a defect inside the steel bar, as shown in FIG. 3, a foreign matter removing member 17 made of an elastic material such as a brush or urethane, rubber, plastic, etc. is lightly pressed against the surface of the steel bar 16. . Next, after the electromagnetic induction sensor 11 is brought close to the surface of the steel bar 16 in this state, the steel bar 16 is rotated in the arrow direction in the figure. When an alternating current is supplied to the exciting coil 11a of the electromagnetic induction sensor 11 and an alternating magnetic field is applied from the exciting coil 11a to the steel bar 16, an induced electromotive force is generated in the induction coil 11b of the electromagnetic induction sensor 11. At this time, the induced electromotive force generated in the induction coil 11 b of the electromagnetic induction sensor 11 changes according to the magnetic flux density of the AC magnetic field applied to the steel bar 16, and the magnetic flux density of the AC magnetic field exists in the steel bar 16. It changes according to the size of the defect.

  Therefore, the amplitude change amount or phase change amount of the induced electromotive force generated in the induction coil 11b of the electromagnetic induction sensor 11 is detected by the inductance change detection circuit 12, and the amplitude change amount of the induced electromotive force detected by the inductance change detection circuit 12 is detected. Alternatively, by comparing the phase change amount with a preset threshold value, it is possible to accurately inspect whether or not a defect such as ground exists in the steel bar 16. As a result, it is necessary to interpose an ultrasonic transmission medium such as oil or water between the ultrasonic flaw detection probe and the surface to be inspected, as in the case where ultrasonic flaw detection is used as a method for flaw detection such as ground. In addition, since a cleaning process after the inspection is unnecessary, an increase in the inspection cost can be suppressed.

  Further, when the electromagnetic induction sensor 11 inspects whether or not a defect such as ground exists in the steel bar 16, the foreign matter removing member 17 made of a brush or an elastic body is lightly pressed against the surface of the steel bar 16. The foreign matter 19 (see FIG. 3) adhering to the surface of the steel bar 16 is removed by the foreign matter removing member 17 before the electromagnetic induction sensor 11. Therefore, it is possible to prevent the inspection accuracy from being lowered by the foreign matter 19 attached to the surface of the steel bar 16.

In 2nd Embodiment mentioned above, although steel bar was illustrated as a test object, this invention is applicable also to things other than steel bar. Moreover, although the case where the presence or absence of the defect which exists in the inside of a steel bar was inspected was illustrated, for example, the present invention is also applied to the case where the surface hardness, the quenching depth, the metal structure change, the presence or absence of foreign materials, etc. are detected. be able to.
Next, a third embodiment of the present invention will be described with reference to FIGS.

FIG. 4 is a diagram showing a schematic configuration of a rolling device part inspection device according to the third embodiment of the present invention. The rolling device component inspection device shown in FIG. A turntable 21 for mounting, an electromagnetic induction sensor 11 provided above the turntable 21, a support shaft 22 for supporting the electromagnetic induction sensor 11 perpendicularly to the upper surface of the turntable 21, and the support a sensor oscillation mechanism 23 via a shaft 22 to swing drives the electromagnetic induction sensor 11 in the X-axis (in the arrow theta _X direction), in the drawing the electromagnetic induction sensor 11 through the sensor oscillation mechanism 23 Z A sensor elevating mechanism 24 that moves up and down in the axial direction, a sensor positioning mechanism 25 that positions the electromagnetic induction sensor 11 by moving the electromagnetic induction sensor 11 in the X-axis direction and the Y-axis direction in the figure, and a turntable 21 in the figure X It is moved in the direction and a positioning mechanism 26 for positioning the cages 20.

  A schematic configuration of the electromagnetic induction sensor 11 is shown in FIG. As shown in the figure, the electromagnetic induction sensor 11 detects an excitation coil 11a for applying an AC magnetic field to the object to be inspected, and a change in magnetic flux density of the AC magnetic field applied to the object to be inspected from the excitation coil 11a. The excitation coil 11a and the induction coil 11b are accommodated in one casing. In FIG. 4, 27 indicates an outer ring of the cylindrical roller bearing, and 28 indicates a roller of the cylindrical roller bearing.

  When inspecting whether a defect such as a nest exists in the inside of the punching holder 20 using the rolling device part inspection apparatus having such a configuration, the punching holder 20 is placed on the turntable 21. After that, the foreign matter removing member 17 made of an elastic body such as a brush or urethane, rubber, or plastic is lightly pressed against the end surface of the machined cage 20. Next, the sensor swing mechanism 23, the sensor elevating mechanism 24, the sensor positioning mechanism 25, and the positioning mechanism 26 are driven to bring the electromagnetic induction sensor 11 closer to the end surface of the machined holder 20, and the turntable 21 is counterclockwise in the figure. Rotate in the direction. In this state, even if an alternating current is supplied to the exciting coil 11a of the electromagnetic induction sensor 11, if an alternating magnetic field 18 (see FIG. 6) is applied to the punch holder 20, an induced electromotive force is applied to the induction coil 11b of the electromagnetic induction sensor 11. Will occur. At this time, the magnitude of the induced electromotive force generated in the induction coil 11 b changes according to the magnetic flux density of the AC magnetic field 18 applied to the machined cage 20, and the magnetic flux density of the AC magnetic field 18 is that of the machined cage 20. It changes according to the size of the defect existing inside.

Accordingly, by measuring the amplitude change amount or phase change amount of the induced electromotive force generated in the induction coil 11b of the electromagnetic induction sensor 11, and comparing the measured value with a preset threshold value, defects such as nests are removed. Whether or not it exists inside the cage 20 can be accurately inspected.
Further, when the electromagnetic induction sensor 11 inspects whether a defect such as a nest exists in the inside of the punching cage 20, the foreign matter removing member 17 made of an elastic body such as a brush or urethane, rubber, or plastic is included. When lightly pressed against the end surface of the punching cage 20, the foreign matter adhering to the end surface of the punching cage 20 is removed by the foreign matter removing member 17 before the electromagnetic induction sensor 11. Therefore, it is possible to prevent the inspection accuracy from being lowered due to the foreign matter adhering to the end face of the machined cage 20.

  In FIG. 7, schematic structure of the inspection apparatus for rolling device components which concerns on the 4th Embodiment of this invention is shown. The rolling device component inspection apparatus shown in FIG. 1 includes a turntable 21 for placing a machined cage 20, an electromagnetic induction sensor 11 provided above the turntable 21, and the electromagnetic induction sensor. 11 is provided with a support shaft 29 that supports the turntable 21 horizontally with respect to the upper surface of the turntable 21. The electromagnetic induction sensor 11 includes two foreign matter removing members 17 made of an elastic body such as a brush or urethane, rubber, or plastic. , 17 are provided in contact with the inner peripheral surface of the machined cage 20.

The fourth embodiment rolling device parts for inspection apparatus according to the embodiment, the sensor swing mechanism 30 for swinging driving the electromagnetic induction sensor 11 around the Z axis (in the arrow theta _Z-direction) through a support shaft 29 And a sensor elevating mechanism 24 that drives the electromagnetic induction sensor 11 to move up and down in the Z-axis direction in the figure via the sensor swinging mechanism 30 and electromagnetic induction by moving the electromagnetic induction sensor 11 in the X-axis direction and the Y-axis direction in the figure. A sensor positioning mechanism 25 for positioning the sensor 11 is provided, and the turntable 21 is movable in the X-axis direction in the figure by a positioning mechanism 26 for positioning an inspection object.

As shown in FIG. 3, the electromagnetic induction sensor 11 detects an excitation coil 11a that applies an AC magnetic field to the inspection object, and changes in the magnetic flux density of the AC magnetic field that is applied from the excitation coil 11a to the inspection object. And an induction coil 11b.
When inspecting whether a defect such as a nest exists in the inside of the punching cage 20 using the rolling device part inspection apparatus having such a configuration, first, the punching cage 20 is turned on the turntable. 21. Next, the sensor swing mechanism 30, the sensor elevating mechanism 24, the sensor positioning mechanism 25, and the positioning mechanism 26 are driven to bring the tip of the electromagnetic induction sensor 11 close to the inner peripheral surface of the machined holder 20, and then the turntable 21. Is rotated counterclockwise in the figure. If an alternating magnetic field is applied to the punching cage 20 even if an alternating current is supplied to the exciting coil 11 a of the electromagnetic induction sensor 11 in this state, an induced electromotive force is generated in the induction coil 11 b of the electromagnetic induction sensor 11. At this time, the magnitude of the induced electromotive force generated in the induction coil 11b changes according to the magnetic flux density of the AC magnetic field applied to the machined cage 20, and the magnetic flux density of the AC magnetic field is inside the machined cage 20. It changes according to the size of the generated defect.

Accordingly, by measuring the amplitude change amount or phase change amount of the induced electromotive force generated in the induction coil 11b of the electromagnetic induction sensor 11, and comparing the measured value with a preset threshold value, defects such as nests are removed. It is possible to accurately inspect whether or not the cage 20 exists.
When the tip of the electromagnetic induction sensor 11 is brought close to the inner peripheral surface of the machined cage 20, the two foreign matter removing members 17, 17 provided on the electromagnetic induction sensor 11 come into contact with the inner peripheral surface of the machined cage 20. To do. When the foreign matter removing members 17, 17 come into contact with the inner peripheral surface of the machined cage 20, the foreign matter attached to the inner peripheral surface of the machined cage 20 is brought before the electromagnetic induction sensor 11 by the foreign material removed members 17, 17. Removed. Therefore, it is possible to prevent the inspection accuracy from being lowered by the foreign matter adhering to the inner peripheral surface of the machined cage 20.

  In FIG. 8, schematic structure of the inspection apparatus for rolling device components which concerns on the 5th Embodiment of this invention is shown. The rolling device component inspection apparatus shown in FIG. 1 includes a turntable 21 for placing a machined cage 20, an electromagnetic induction sensor 11 provided above the turntable 21, and the electromagnetic induction sensor. 11 is supported horizontally with respect to the upper surface of the turntable 21, a sensor swing mechanism 30 that swings the electromagnetic induction sensor 11 around the Z axis via the support shaft 29, and the sensor swing. A sensor elevating mechanism 24 that drives the electromagnetic induction sensor 11 to move up and down in the Z-axis direction in the figure via the mechanism 30, and a sensor that positions the electromagnetic induction sensor 11 by moving the electromagnetic induction sensor 11 in the X-axis direction and the Y-axis direction in the figure. Positioning mechanism 25. As shown in FIG. 3, the electromagnetic induction sensor 11 detects an excitation coil 11a that applies an AC magnetic field to the object to be inspected, and changes in the magnetic flux density of the AC magnetic field that is applied from the excitation coil 11a to the object to be inspected. And an induction coil 11b.

  FIG. 9 is a view showing the tip of the electromagnetic induction sensor 11. As shown in FIG. 9, the inner diameter of the machined cage 20 is 2R, the inner peripheral surface 20 a of the machined cage 20 and the electromagnetic induction sensor 11. When the gap between the front end surface 11c and ΔR is ΔR, the front end surface 11c of the electromagnetic induction sensor 11 is formed into a curved surface with a radius of curvature of R−ΔR and is convex with respect to the inner peripheral surface 20a of the machined cage 20. Is curved.

  When inspecting whether a defect such as a nest exists in the inside of the punching cage 20 using the rolling device part inspection apparatus having such a configuration, first, the punching cage 20 is turned on the turntable. After being placed on 21, the sensor swing mechanism 30, the sensor elevating mechanism 24 and the sensor positioning mechanism 25 are driven to bring the tip of the electromagnetic induction sensor 11 closer to the inner peripheral surface of the machined holder 20. If an alternating magnetic field is applied to the punching cage 20 even if an alternating current is supplied to the exciting coil 11 a of the electromagnetic induction sensor 11 in this state, an induced electromotive force is generated in the induction coil 11 b of the electromagnetic induction sensor 11. At this time, the magnitude of the induced electromotive force generated in the induction coil 11b changes according to the magnetic flux density of the AC magnetic field applied to the machined cage 20, and the magnetic flux density of the AC magnetic field is inside the machined cage 20. It changes according to the size of the generated defect.

Accordingly, by measuring the amplitude change amount or phase change amount of the induced electromotive force generated in the induction coil 11b of the electromagnetic induction sensor 11, and comparing the measured value with a preset threshold value, defects such as nests are removed. It is possible to accurately inspect whether or not the cage 20 exists.
In addition, since the tip surface 11c of the electromagnetic induction sensor 11 is shaped to match the inner peripheral surface of the machined cage 20, changes in induced electromotive force can be captured with high sensitivity.

  In FIG. 10, schematic structure of the inspection apparatus for rolling device components which concerns on the 6th Embodiment of this invention is shown. The rolling device component inspection apparatus shown in FIG. 1 includes a turntable 21 on which an outer ring 27 of a cylindrical roller bearing is placed, an electromagnetic induction sensor 11 provided above the turntable 21, and the electromagnetic induction. A support shaft 29 that supports the sensor 11 horizontally with respect to the upper surface of the turntable 21, a sensor swing mechanism 30 that swings the electromagnetic induction sensor 11 about the Z axis via the support shaft 29, and the sensor swing A sensor raising / lowering mechanism 24 that drives the electromagnetic induction sensor 11 to move up and down in the Z-axis direction in the figure via the moving mechanism 30, and moves the electromagnetic induction sensor 11 in the X-axis direction and the Y-axis direction in the figure to position the electromagnetic induction sensor 11. As shown in FIG. 5, the electromagnetic induction sensor 11 includes an excitation coil 11a for applying an alternating magnetic field to the object to be measured, and the excitation coil 11a. And is configured to change in the magnetic flux density of the AC magnetic field is applied to the workpiece from the induction coil 11b to detect. The front end surface of the electromagnetic induction sensor 11 has a concave shape that matches the outer ring outer diameter surface of the cylindrical roller bearing so that changes in induced electromotive force can be detected with high sensitivity.

  When inspecting whether or not a defect such as ground exists in the outer ring 27 using the rolling device part inspection apparatus having such a configuration, after the outer ring 27 is placed on the turntable 21. The foreign matter removing member 17 made of an elastic body such as a brush or urethane, rubber, or plastic is lightly pressed against the outer peripheral surface of the outer ring 27. Next, the sensor swing mechanism 30, the sensor lifting mechanism 24, and the sensor positioning mechanism 25 are driven to bring the electromagnetic induction sensor 11 closer to the outer peripheral surface of the outer ring 27, and the turntable 21 is rotated clockwise in the figure. In this state, when an alternating current is supplied to the excitation coil 11 a of the electromagnetic induction sensor 11 and an alternating magnetic field is applied to the outer ring 27, an induced electromotive force is generated in the induction coil 11 b of the electromagnetic induction sensor 11. At this time, the magnitude of the induced electromotive force generated in the induction coil 11 b changes according to the magnetic flux density of the AC magnetic field applied to the outer ring 27, and the magnetic flux density of the AC magnetic field is the magnitude of the defect generated inside the outer ring 27. It changes according to.

Therefore, the amplitude change amount or the phase change amount of the induced electromotive force generated in the induction coil 11b of the electromagnetic induction sensor 11 is measured, and the measured value is compared with a preset threshold value. 27 can be inspected with high accuracy.
Further, when the electromagnetic induction sensor 11 inspects whether or not a defect such as ground exists in the outer ring 27, the foreign matter removing member 17 made of an elastic body such as a brush or urethane, rubber, or plastic is attached to the outer ring 27. , The foreign matter adhering to the outer peripheral surface of the outer ring 27 is removed by the foreign matter removing member 17 before the electromagnetic induction sensor 11. Therefore, it is possible to prevent the inspection accuracy from being lowered due to the foreign matter adhering to the outer peripheral surface of the outer ring 27.

It is a figure which shows schematic structure of the inspection apparatus for rolling device components which concerns on the 1st Embodiment of this invention. It is a figure which shows schematic structure of the inspection apparatus for rolling device components which concerns on the 2nd Embodiment of this invention. It is a figure for demonstrating the method when test | inspecting with a magnetic induction sensor whether a defect exists in the inside of a steel bar. It is a figure which shows the inspection apparatus for rolling device components which concerns on the 3rd Embodiment of this invention. It is a figure which shows schematic structure of an electromagnetic induction sensor. It is a figure for demonstrating the alternating current magnetic field provided to rolling device components from the exciting coil of an electromagnetic induction sensor. It is a figure which shows the inspection apparatus for rolling device components which concerns on the 4th Embodiment of this invention. It is a figure which shows the inspection apparatus for rolling device components which concerns on the 5th Embodiment of this invention. It is a figure which shows the front-end | tip part of an electromagnetic induction sensor. It is a figure which shows the inspection apparatus for rolling device components which concerns on the 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Excitation coil 3 Impedance change detection circuit 4,13 Judgment device 5,14 Display apparatus 6,15 Recording apparatus 11 Electromagnetic induction sensor 11a Excitation coil 11b Induction coil 12 Inductance change detection circuit 16 Bar steel 17 Foreign material removal member 18 AC magnetic field 20 Cage 21 Turntable 22, 29 Support shaft 23, 30 Sensor swing mechanism 24 Sensor lifting mechanism 25 Sensor positioning mechanism 27 Outer ring 28 Roller

Claims (12)

Using an electromagnetic induction sensor having an exciting coil for applying an alternating magnetic field to the rolling device component and an induction coil for detecting a change in magnetic flux density of the alternating magnetic field applied to the rolling device component from the exciting coil; and A roller that inspects any of defects, surface hardness, quenching depth, metal structure change, and foreign material contamination existing on or inside the rolling device component while relatively moving the rolling device component and the electromagnetic induction sensor. A method for inspecting moving device parts,
When inspecting the rolling device component, the tip of the foreign material removing member is brought into contact with the surface of the rolling device component, and the foreign material adhering to the surface of the rolling device component is brought before the electromagnetic induction sensor by the foreign material removing member. A method for inspecting a rolling device part, wherein the rolling device part is inspected while being removed at a step.   2. The method for inspecting a rolling device part according to claim 1, wherein the foreign matter removing member is an elastic body.   3. The method for inspecting a rolling device part according to claim 2, wherein the elastic body is any one of a brush, urethane, rubber, and plastic. Using an electromagnetic induction sensor having an exciting coil for applying an alternating magnetic field to the rolling device component and an induction coil for detecting a change in magnetic flux density of the alternating magnetic field applied to the rolling device component from the exciting coil; and A roller that inspects any of defects, surface hardness, quenching depth, metal structure change, and foreign material contamination existing on or inside the rolling device component while relatively moving the rolling device component and the electromagnetic induction sensor. A method for inspecting moving device parts,
A method for inspecting a rolling device component, wherein the tip surface of the electromagnetic induction sensor is shaped to match the surface shape of the rolling device component facing the sensor.   5. The method of inspecting a rolling device part according to claim 4, wherein the electromagnetic induction sensor and the rolling device part are defined in shape so that the magnetic field lines of an alternating magnetic field are 90 degrees with respect to the rolling device part. A method for inspecting rolling device parts, characterized in that:   6. The method for inspecting a rolling device part according to claim 1, wherein a material of the rolling device component is a steel bar.   6. The rolling device part inspection method according to claim 1, wherein the member to be detected is a member obtained by casting a member as a material as a rolling device part by forging. Inspection method for moving parts.   6. The method of inspecting a rolling device part according to claim 1, wherein the member to be detected is a member subjected to grinding or superfinishing as the rolling device part. Inspection method. Using an electromagnetic induction sensor having an exciting coil for applying an alternating magnetic field to the rolling device component and an induction coil for detecting a change in magnetic flux density of the alternating magnetic field applied to the rolling device component from the exciting coil; and A roller that inspects any of defects, surface hardness, quenching depth, metal structure change, and foreign material contamination existing on or inside the rolling device component while relatively moving the rolling device component and the electromagnetic induction sensor. A method for inspecting moving device parts,
When inspecting the rolling device component, the tip of the foreign material removing member is brought into contact with the surface of the rolling device component, and the foreign material adhering to the surface of the rolling device component is brought before the electromagnetic induction sensor by the foreign material removing member. The rolling device part is inspected while being removed at the same time, and the tip surface of the electromagnetic induction sensor is inspected according to the surface shape of the rolling device part. Inspection method for parts.   An inspection device for a rolling device part used in the inspection method according to claim 1, wherein the exciting coil applies an alternating magnetic field to the rolling device component and the magnetic flux of the alternating magnetic field applied from the exciting coil to the rolling device component. An electromagnetic induction sensor having an induction coil for detecting a change in density; a data processing unit for detecting a change amount of at least one of amplitude and phase of an induced electromotive force generated in the induction coil; and the data processing unit A rolling device parts inspection device, comprising: a determination unit that compares the output of the output with a threshold value to determine whether or not to pass or fail.   5. An inspection device for a rolling device part used in the inspection method according to claim 4, wherein an exciting coil for applying an alternating magnetic field to the rolling device component and a magnetic flux of an alternating magnetic field applied from the exciting coil to the rolling device component. An electromagnetic induction sensor having an induction coil for detecting a change in density, a data processing unit for measuring a change amount of at least one of an amplitude and a phase of an induced electromotive force generated in the induction coil, and the data processing unit A rolling device parts inspection device, comprising: a determination unit that compares the output of the output with a threshold value to determine whether or not to pass or fail.   An inspection device for a rolling device part used in the inspection method according to claim 9, wherein the exciting coil applies an alternating magnetic field to the rolling device component, and the magnetic flux of the alternating magnetic field is applied from the exciting coil to the rolling device component. An electromagnetic induction sensor having an induction coil for detecting a change in density, a data processing unit for measuring a change amount of at least one of an amplitude and a phase of an induced electromotive force generated in the induction coil, and the data processing unit A rolling device parts inspection device, comprising: a determination unit that compares the output of the output with a threshold value to determine whether or not to pass or fail.

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