JPH07256542A - Polishing device for workpiece having circular section - Google Patents

Abstract

PURPOSE:To automatically detect the surface flaw with high precision by installing a control means which carries out the eddy current testing for detecting the surface flaw and corrects the polishing quantity. CONSTITUTION:A eddy current testing head 33 is brought into contact with the outer peripheral surface of a roll 1 for rolling by the instruction of a controller 5, and the eddy current testing is carried out by the outputs of the eddy current testing coils arranged between a plurality of contact rollers installed on the eddy current testing head 33. During the revolution drive of the roll 1 for rolling, the eddy current testing head 33 is relatively shifted in the axis line direction of the roll 1 for rolling. Accordingly, the surface flaw is detected in the wide range on the surface of the roll 1 for rolling, and the polishing quantity is corrected, and the surface flaw is removed. In this case, the relative shift of the eddy current testing head 33 in the axis line direction of the roll 1 for rolling is easily realized by installing the eddy current testing head 33 on a wheel spindle stock 18 on which a grinding wheel 19 is placed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically and accurately grinding a circular cross-section workpiece having a circular cross section perpendicular to the axis, such as a rolling roll.

[0002]

2. Description of the Related Art Conventionally, for polishing a work having a circular cross section, in particular, various elongated rolling rolls, conveyor rolls, various shafts and cylinder rods, for example, Japanese Patent Publication No. 62-5.
It is performed using a cylindrical grinding machine disclosed in Japanese Patent No. 7515 and Japanese Patent Laid-Open No. 3-92267.

Among workpieces having a circular cross section, the rolling roll has a high frequency of polishing. When the surface of the rolling roll is flawed, the surface of the metal strip to be rolled using the roll is flawed, resulting in a defective product. Among the rolling rolls,
Sendzimir type rolling mill which is a cluster type mill,
Similarly, a work roll such as an ultra-thin mill and a first-stage roll have a diameter of about 40 mm to 150 mm and a comparatively small diameter, and therefore high precision polishing is required.
Also, the diameter of the grindstone used for polishing is measured in advance when the grindstone is brought into contact with the outer peripheral surface of the circular cross-section workpiece to perform grinding.
Further, highly accurate polishing cannot be performed unless the amount of abrasion during polishing is taken into consideration.

Japanese Patent Publication No. 62-57515 discloses a prior art relating to polishing by adjusting the pushing amount of a vibration isolator for supporting a workpiece from the side facing the grinding stone. Japanese Unexamined Patent Publication No. 3-92267 discloses a prior art in which the feed amount of a grinding wheel head and the pushing amount of a vibration isolator are adjusted so that a diameter error is within a reference value while moving and measuring the diameter of a circular cross-section workpiece. Is disclosed.

[0005]

According to the above prior arts, automatic grinding can be performed by setting a rolling roll or the like on a cylindrical grinder and setting polishing conditions such as the grinding amount. . However, when there is a flaw on the surface of the roll to be ground, the flaw is automatically detected and removed,
In consideration of wear of the grindstone due to grinding, it is not possible to correct the feed amount of the grindstone according to the diameter of the grindstone during grinding.

An object of the present invention is to correct the amount of polishing so as to remove surface defects that detect surface defects of a circular cross-section workpiece, or to measure the diameter of a grindstone so that the substantial amount of polishing becomes constant. Thus, it is an object of the present invention to provide a polishing apparatus for a workpiece having a circular cross section, which can correct the feed amount of a grindstone.

[0007]

SUMMARY OF THE INVENTION The present invention is an apparatus for polishing an outer peripheral surface of a circular workpiece having a circular cross section, which is rotatably supported on a central axis, by a grindstone that relatively moves in the axial direction while rotating, and a tip portion is a cross section. An abutting means capable of switching between a state in which the circular workpiece is in contact with the outer peripheral surface and a state in which the circular workpiece is separated from the outer peripheral surface, and the distal end portion of the abutting means is provided with a space in the circumferential direction of the circular workpiece. With the plurality of contact rollers, the eddy current flaw detection coil arranged between the contact rollers, and the contact means in contact with the outer peripheral surface of the circular cross-section workpiece, the circular cross-section workpiece is rotated while being driven. A circular section having a control means for controlling relative movement of the contact means in the axial direction, performing eddy current flaw detection for detecting a surface flaw by the output from the eddy current flaw detection coil, and correcting the polishing amount. It is a work piece polishing machine.

Further, the abutting means of the present invention is characterized in that the abutting means moves together with the grindstone in the axial direction of the workpiece having a circular cross section.

Further, the abutting means of the present invention is provided with display means for displaying the detected position of the surface flaw on the outer peripheral surface of the circular cross-section workpiece in response to the flaw detection output from the eddy current flaw detection coil. Characterize.

Further, the present invention is an apparatus for polishing an outer peripheral surface of a circular workpiece having a circular cross section, which is rotatably supported on a central axis, by a grindstone position which relatively moves in the axial direction while rotating.
Diameter measuring means for measuring the diameter of the circular cross-section workpiece, feed means for moving the grindstone in the direction perpendicular to the axis of the circular cross-section workpiece, and the diameter of the grindstone has a predetermined reference value Distance setting means for setting the distance between the axes of the circular work piece and the grindstone in contact with the outer peripheral surface of the work piece, and contact detection means for detecting the contact state between the grindstone and the circular work piece in cross section , After the grindstone is moved perpendicularly to the axis by the feed means in response to the detection output from the contact detection means so that there is a distance between the axes from the circular cross-section workpiece by the distance set by the distance setting means. , A calculation control means for bringing the grindstone closer to the circular cross-section workpiece at a speed lower than this moving speed, calculating the diameter of the grindstone from the distance between the axes when the grindstone contacts the circular cross-section workpiece, and correcting the polishing amount. Circular cross-section work characterized by including Which is a polishing machine.

Further, the contact detecting means of the present invention is characterized in that the contact state is detected from an increase in load current of a motor for driving the feeding means.

Further, the present invention is an apparatus for polishing an outer peripheral surface of a circular cross-section workpiece which is rotatably supported on a central axis by a grindstone which relatively moves in the axial direction while rotating, and is provided at a predetermined position and has a reference position. Interval measuring means for measuring the distance to the outer peripheral surface of the rotating grindstone, feeding means for moving the grindstone in the radial direction, the distance measuring means when the diameter of the grindstone has a predetermined reference value, and the axis of the grindstone In response to the detection output from the distance setting means for setting the distance between the distance setting means and the distance detecting means, so that there is a distance between the distance measuring means and the axis of the grindstone by the distance set in the distance setting means,
After moving the grindstone by the feeding means, the grindstone is moved closer to the distance measuring means at a lower speed than this moving speed, and the distance between the axis line of the grindstone and the distance measuring means, which is the reference output for which the detection output is predetermined, of the grindstone. A polishing device for a circular workpiece having a circular cross section, which includes a calculation control means for calculating a diameter and correcting a polishing amount.

The interval detecting means of the present invention ejects air from the nozzle toward the outer peripheral surface of the rotating grindstone,
It is characterized in that the distance from the nozzle to the outer peripheral surface of the grindstone is detected by the pressure of the jetted air.

Further, the distance setting means of the present invention is characterized in that a distance corresponding to the diameter of the grindstone calculated in the previous measurement is set.

Further, according to the present invention, in an apparatus for polishing an outer peripheral surface of a circular work piece having a circular cross section which is rotatably supported on a central axis by a grindstone that relatively moves in an axial direction while rotating, the outer peripheral surface of the circular work piece having a circular cross section is abutted. While touching, eddy current flaw detection means for detecting surface flaws on a circular cross-section workpiece by eddy current flaw detection, diameter measurement means for measuring the diameter of the grindstone, and surface flaws responding to the output from the eddy current flaw detection means and the diameter measurement means. When detected, the polishing amount corresponding to the depth of the detected surface flaw is set, and the control means for controlling the cutting amount of the grinding stone according to the measured value of the diameter of the grinding stone so as to correspond to the set polishing amount. It is a polishing device for a circular cross-section workpiece.

[0016]

According to the present invention, the tip portion of the abutting means is brought into contact with the outer peripheral surface of the circular cross-section workpiece, and the output from the eddy current flaw detection coil disposed between the plurality of abutment rollers provided at the tip portion is used. Perform eddy current flaw detection. Since the abutting means for rotationally driving the circular cross-section workpiece is relatively moved in the axial direction of the circular cross-section workpiece, the surface flaw can be detected in a wide range of the surface of the circular workpiece. The relative movement in the axial direction can be easily realized by providing an abutting means on the grindstone base on which the grindstone is mounted.

According to the invention, the abutting means is provided with a display means for displaying the position of the surface flaw detected by the eddy current flaw detection coil on the outer peripheral surface of the circular cross-section workpiece. Since the position where the display flaw exists is displayed on the outer peripheral surface, the inspector can easily confirm the position where the surface flaw is detected after polishing. Further, even when a plurality of surface flaws are detected, the position of each individual surface flaw can be easily confirmed.

Further in accordance with the invention, the diameter of the circular cross-section workpiece is measured by diameter measuring means. By moving the grindstone in a direction perpendicular to the axis of the circular cross section workpiece by the feeding means, the grindstone subtracts the measured value of the circular cross section workpiece from the distance between the circular cross section of the circular cross section workpiece and the axis of the grindstone. The diameter of the grindstone can be calculated. Since the movement of the grindstone by the feed means moves to a predetermined axial distance and then moves at a low speed until it abuts, it is possible to detect the abutting position in a highly accurate state in which elastic deformation or the like is small.

Further, according to the invention, the contact state is detected from the increase of the load current of the motor for driving the feeding means. The load on the motor is small when the grindstone is not in contact with the outer peripheral surface of the circular cross-section workpiece, and the load increases after contact. This change in load can be easily detected as an increase in load current.

Further, according to the present invention, the axis of the grindstone when the grindstone is brought close to the distance measuring means provided at the predetermined position by the feeding means and the distance between the feeding means and the outer peripheral surface of the grindstone is at the predetermined position. The radius of the grindstone is calculated by the distance between the distance measuring means and the distance measuring means. Since the position of the axis line of the grindstone moved by the feeding means with respect to the set position of the interval detecting means can be easily and highly accurately obtained as the original function of the polishing apparatus, the diameter of the grindstone can also be easily and highly accurately calculated.

Further, according to the present invention, the interval detecting means ejects air from the nozzle toward the outer peripheral surface of the rotating grindstone, and detects the interval from the nozzle to the outer peripheral surface of the grindstone by the pressure of the ejected air. Since the so-called air micrometer principle is used, the distance to the grindstone outer peripheral surface can be detected with high accuracy.

According to the invention, the distance setting means includes:
The distance corresponding to the diameter of the grindstone calculated during the previous measurement is set. Since the grindstone wears due to continued polishing, it is smaller than the diameter calculated in the previous measurement by the wear amount. Even when the grindstone is moved to the position corresponding to the previous diameter by the feeding means, the grindstone does not come into contact with the circular cross-section work piece or the interval detecting means. Since the low-speed movement from the set position by the feeding means needs to be performed by an amount corresponding to the amount of wear, the diameter can be measured quickly.

Further, according to the present invention, the surface flaw of the circular cross-section workpiece is detected by the eddy current flaw detection means, and the diameter of the grindstone is measured by the diameter measuring means. When the surface flaw is detected, the accurate diameter of the grindstone is determined. Based on this, it is possible to set the cutting amount of the grindstone corresponding to the polishing amount required to remove the surface flaw. Since only the polishing required to remove surface flaws is performed, surface flaws can be reliably removed, preventing the increase in polishing time due to extra polishing and the shortening of the usable life of circular cross-section workpieces. You can

[0024]

1 is a plan view of a polishing apparatus for a circular cross-section workpiece according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a schematic electrical configuration of the embodiment of FIG. Further, FIG. 3 is a side view showing a configuration for detecting a surface flaw in the embodiment of FIG. 1, and FIGS. 4 and 5 are side views and a front view showing a part of a device for detecting a surface flaw, which is cut away. 6 and 7 show a plan view and a side view, respectively, with the marking device attached. FIG. 8 shows a front view of the marking device. FIG. 9 is a graph showing an eddy current flaw detection signal for surface flaw detection. FIG. 10 is a side view of the configuration of the diameter measuring device, and FIG. 11 is a side view of the diameter measuring device.

Furthermore, FIG. 12 is a side view showing a structure for measuring a diameter of a grindstone according to another embodiment of the present invention.
FIG. 13 is a side view showing the configuration of still another embodiment of the present invention, and FIGS. 14 and 15 are a side view and a plan view showing its operating state, respectively. 16 and 17 are a side view and a plan view showing the configuration of the wiper device, respectively.

In the present specification, as an example of a circular cross-section work piece, a rolling roll, particularly a work roll such as a Sendzimir type rolling mill or an ultrathin mill, or a small-diameter rolling roll used as a first stage roll is used. The case of polishing will be described. The rolling roll may have a cylindrical shape with a uniform thickness as a whole, but in some cases, a small-diameter shaft portion is formed at both ends and a large-diameter body portion is formed in the center. Further, the magnetic part may be solid or hollow. In either case, the outer peripheral surface is the object of polishing. Note that "polishing" is used as a concept including both "grinding" for changing the diameter of a circular cross-section workpiece to some extent and "polishing" for polishing the surface of a circular cross-section workpiece. Other examples of circular cross-section workpieces are rolls for transportation used in conveyors, various types of rotary shafts such as propeller shafts of ships, especially parts supported by radial bearings, or rods inserted into cylinders. Is included as a target.

As shown in FIG. 1, a roll 1 having a circular cross section is mounted on a roll grinder 2 which is a polishing device and is polished. The roll 1 is carried in from the roll attaching / detaching device 3 by the roll conveying device 4. The controller 5 controls the operation of each part of the roll grinder 2. At one end of the roll 1, a kelet 6 that is a mechanism for transmitting a rotational driving force is mounted. The kelet 6 is attached and detached by a kelet attachment / detachment device 7 provided adjacent to the roll attachment / detachment device 3. The roll attaching / detaching device 3 is also provided with an anti-seizure agent applying device 8,
An anti-seizure agent is applied to the shaft cores on both ends of the roll 1. The roll 1 has, for example, a body portion having a diameter of 20 to 160 mm and a maximum length of about 4 m, and is made of die steel (SKD) or high speed steel (SK).
H).

The roll 1 comprises a spindle 12a of a spindle stock 12 provided on a processing table 11 and a spindle shaft 1 of a tailstock 13.
It is centered and rotatably supported with respect to 3a. The processing table 11 has a spindle 12a on the work bed 14.
It is slidable and displaceable in the axial direction that connects the centering shaft 13a with the core pushing shaft 13a. The sliding displacement of the processing table 11 is performed by rotationally driving the ball screw 15 by the processing table motor 16. The ball screw 15 is screwed into a nut member 17 fixed to the processing table 11, the rotational movement is converted into a linear movement, and fine adjustment is possible in units of 1 μm.

To grind the roll 1, a grindstone 19 is provided on the grindstone base 18. The grindstone 19 is rotationally driven by a grindstone motor 20. The grindstone base 18 is a grindstone bed 21.
The upper part can be slidably displaced in a direction perpendicular to the axis connecting the main shaft 12a and the tailstock shaft 13a. This sliding displacement is performed by rotating and driving the ball screw 22 by the wheel head motor 23. A nut member 24 screwed onto the ball screw 22 is fixed to the grindstone base 18, the rotary motion is converted into a linear motion, and the feed of the grindstone mount 18 can be finely adjusted in units of 0.01 μm.

The polishing of the outer peripheral surface of the roll 1 by the grindstone 19 causes the grindstone base 18 to approach the roll 1 while sliding the working table 11 to the right in FIG. Is performed while contacting the outer peripheral surface of the. The axis of the roll 1 is centered so as to coincide with the axis connecting the main shaft 12a and the centering shaft 13a, and the movement position in the axial direction is detected by the encoder 25.
The roll 1 has a relatively small diameter and is long and slender, and is easily bent by its own weight or the pressing force of the grindstone 19. When the roll 1 bends, the intermediate portion becomes eccentric, and accurate polishing cannot be performed. For this reason,
A plurality of anti-vibration devices 26 are provided at intervals in the axial direction. The roll 1 is rotationally driven in the opposite direction to the roll 1 from the spindle motor 27 via the keray 6. The diameter of the roll 1 is the diameter measuring device 30 provided on the grindstone base 18.
Can be measured by The surface flaw of roll 1 is
The eddy current flaw detection head 33 is brought into contact with the surface of the roll 1 for detection. The eddy current flaw detection head 33 includes an arm 34 that is swingably displaced.
It is attached to the tip of the roll 1 and can be switched between a state of contacting the outer peripheral surface of the roll 1 and a state of separating from the outer peripheral surface of the roll 1.

As shown in FIG. 2, the control device 5 has the configuration shown in FIG.
Signals from the encoder 25 and the diameter measuring device 30 shown in are input. Further, the control device 5 uses the wheel head motor 2
3, the grindstone motor 20, the processing table motor 16, the spindle motor 27, the vibration isolator 26, the roll transport device 4, the kelet attachment / detachment device 7 and the anti-seizure agent application device 8 are controlled. Further, the control device 5 can be given an input from the input device 41 for instructing the operation of the roll grinder 2. Further, a memory 42 for storing data required during the operation of the roll grinder 2 and various set positions is also provided. A signal from the eddy current flaw detection coil 43 provided in the eddy current flaw detection head 33 is also input. In order to perform the eddy current flaw detection, it is necessary to operate the flaw detection cylinder 44 to swing and displace the arm 34 and bring the eddy current flaw detection head 33 into contact with the outer peripheral surface of the roll 1. Further, when the surface flaw is detected, the marking device 45 can be operated to simultaneously display the position of the surface flaw. The display can be performed after the detection position is stored in the memory and the surface flaws are removed by polishing.
In this case, it becomes easy to confirm whether or not the surface flaw is removed. A change in the load current when the grindstone motor 23 is rotationally driven to press the grindstone 19 against the surface of the roll 1 is detected by the current detection circuit 46 and input to the control device 5.

As shown in FIG. 3, as a mechanism for bringing the eddy current flaw detection head 33 into contact with the outer peripheral surface of the roll 1, a drive unit 47 for oscillating and displacing the arm 34 and a bearing for oscillating and displacing the arm 34. A section 48 is provided. Bearing part 48
Allows not only the swinging displacement of the arm 34 in a plane perpendicular to the axis of the roll 1 but also the angular displacement around the vertical axis. A cover 49 is provided above the grindstone 19 to prevent grinding debris from scattering around.

As shown in FIGS. 4 and 5, in the eddy current flaw detection head 33, an eddy current flaw detection coil 43 is attached to a mount 50. The mounting base 50 is pivotally supported by the pin 51 at the tip of the arm mounting member 52. Eddy current flaw detection coil 43
A flaw detection roller 53 is attached to the tip of the, and a guide roller 54 is provided on the attachment base 50 around the eddy current flaw detection coil 43. When the eddy current flaw detection head 33 is in contact with the outer peripheral surface of the roll 1, the guide roller 54 and the flaw detection roller 53 are in contact with each other. A spring 55 is provided between the mount 50 and the eddy current flaw detection coil 43, and biases the flaw detection roller 53 so as to surely contact the outer circumferential surface of the roll 1 according to the curved surface of the outer circumferential surface of the roll 1. There is. As a result, the distance from the outer peripheral surface to the eddy current flaw detection coil 43 is kept constant, and the accuracy of detection of surface flaws and irregularities due to eddy current flaw detection is improved. The arm 34 is connected to the arm attachment member 52 from the right side of FIG.

As shown in FIGS. 6 and 7, a marking device 45 is provided at the tip of the arm attachment member 52 adjacent to the eddy current flaw detection head 33. The output from the eddy current flaw detection head 33 is taken out by the signal cable 56. The compressed air for operating the marking device 45 is erased via the air hose 57.

As shown in FIG. 8, the marking device 45
Includes a main body 58, an air cylinder 59, a chuck 60, a choke 61, an electromagnetic valve 62, etc., and a control signal is supplied via a signal cable 63. This signal switches the solenoid valve 62 and causes the chuck 60 attached to the tip of the rod of the air cylinder 59 to move in and out. A chuck 61 for marking is held on the chuck 60. Instead of the chalk 61, a pen tip of a felt pen or the like may be used to supply the liquid ink.

As shown in FIG. 9, the detection output from the eddy current flaw detection coil 43 is frequency discriminated using a spectrum analyzer to prevent erroneous detection. That is, an A region in which various defects are obtained in the state of the highest S / N value, a B region in which points are set only for cracks that are important defects, and a C region that is a pass band that causes the largest malfunction. Is set, and the surface flaw is detected by comparing the signals in the respective areas and performing mutual calculation. Basically, the cause of the malfunction is removed based on the result of comparing the B area and the C area with the A area as the center. The flaw depth is calculated based on the inspection value of a sample artificially created by electrical discharge machining or the like.

As shown in FIG. 10, a diameter measuring device 30
Measures the diameter by sandwiching the outer peripheral portion of the roll 1 from the vertical direction of the roll 1. The diameter measuring device 30 is used for the whetstone base 18.
The upper part can be slidably displaced in a direction perpendicular to the axis of the roll 1. The work bed 14 is supported by the frame 65. The grindstone base 18 is arranged on a grindstone bed 21 provided adjacent to the frame 65.

As shown in FIG. 11, the diameter measuring device 30 is provided with an upper contact 71 and a lower contact 72 on the measuring unit main body 70. Upper contact 71 and lower contact 7
The outer peripheral portion of the roll 1 is sandwiched between the roll 2 and the roll 2 from above and below, and the diameter is measured. Roll 1 whose diameter was measured in this way
The diameter of the grindstone 19 can be detected by bringing the grindstone 19 into contact with the outer periphery of the grindstone. That is, the processing table 11
By displacing the whetstone in the axial direction of the roll 1 so that the grindstone 19 comes into contact with the portion whose diameter has been measured, the radius of the grindstone 19 is calculated from the position of the whetstone 19 at the time of contact, and the diameter of the grindstone 19 can be obtained. it can. The position of the axis of the grindstone 19 is the grindstone 1
It can be easily obtained from the number of revolutions of the wheel head motor 23 required for the displacement from the reference position of No. 8 and the like. The position of the axis of the roll 1 is basically a constant reference value for the roll grinder 2 as the position of the axis connecting the main shaft 12a and the centering shaft 13a. When the grindstone 19 and the roll 1 are in contact with each other, the distance between the two axes is calculated from these position data. Since the distance between the axes is the sum of the radius of the roll 1 and the radius of the grindstone 19, if the diameter of the roll 1 is measured, the radius of the grindstone 19 can be easily calculated.
The diameter of the grindstone 19 can be easily calculated as twice the radius.

The contact state between the roll 1 and the grindstone 19 can be easily detected from the change in the load current with respect to the feed of the grinding wheel head motor 23. When the grindstone 19 is not in contact with the surface of the roll 1, the load on the feed of the grindstone motor 23 is light and the load current is small. When the contact is started, the load of the feed increases and the load current increases. By detecting the increase in the load current, it is possible to detect that the grindstone 19 is in contact with the outer peripheral surface of the roll 1. In order to improve the detection accuracy, it is necessary to feed the grindstone base at a low speed, but it is faster to feed the grindstone 19 as soon as possible until just before the grindstone 19 contacts the outer peripheral surface of the roll 1. In terms of Therefore, the diameter of the grindstone 19 is set to a value slightly larger than a value estimated as the actual diameter of the grindstone in advance, and the grindstone base 18 is rapidly moved to a position determined based on the set value. When approaching after passing the set position, it is sufficient to send at a speed as low as possible. When the polishing by the grindstone 19 is repeated, the previously measured value may be stored in advance and the grindstone base 18 may be rapidly fed to a position based on the stored measured value.

As shown in FIG. 12, the diameter of the grindstone 19 is
It is also possible to directly measure the diameter of the roll 1 without measuring it. FIG. 12 (1) shows a configuration for measuring the diameter of the grindstone 19 using the photoelectric switch 80. The photoelectric switch 80 includes an output unit 81 that emits light such as infrared rays and visible light.
And an input section 82 for receiving the reflected light is provided. The emitted light and the incident light are focused at a distance d1 that is, for example, 10 mm apart. When the grindstone 19 is brought closer to reach the position where the surface thereof is separated from the optical sensor 80 by 10 mm, the intensity of the detection signal in the input section 82 is increased, and it is detected that the grindstone 19 is approaching. FIG. 12 (2) shows a configuration in which the approach of the grindstone 19 is detected by using the air sensor 90. The air sensor 90 is also provided with an output section 91 and an input section 92, and air is ejected from the output section 91 to cause the input section 9
At 2, a change in pressure is detected. For example, when the outer peripheral surface of the grindstone 19 is separated from the surface of the air sensor 90 by 4 to 6 mm, the distance d2 between the grindstone 19 and the air sensor 90 is measured as a change in the detected pressure in the input unit 90.

When the distance between each of the sensors 80 and 90 in FIG. 12 and the grindstone 19 is measured, the axial position of the grindstone 19 can be easily calculated according to the function basically provided in the roll grinder 2. Therefore, the radius of the grindstone 19 is calculated,
The diameter can be easily calculated.

Roll grinder 1 according to another embodiment of the present invention
02 is shown in FIG. In this embodiment, parts corresponding to those in the embodiment of FIG. 1 are designated by the same reference numerals. It should be noted in this embodiment that an abrasive agent nozzle 103 for discharging an abrasive agent is provided around the grindstone 19, and the arm 104 equipped with the eddy current flaw detection head 33 is not the grindstone 19 but the arm 104.
Is provided on the side opposite to. In the state shown in FIG. 13, the eddy current flaw detection head 33 is separated from the surface of the roll 1.

As shown in FIG. 14, when the eddy current flaw detection head 33 is brought into contact with the surface of the roll 1, the surface flaw of the roll 1 can be detected by the eddy current flaw detection method as in the embodiment shown in FIG. In this embodiment, the diameter measuring device 30 is also provided on the side facing the grindstone 19 with the roll 1 interposed therebetween.
The arm 104 is L-shaped, and the eddy current flaw detection head 33 is provided at the tip on the short side. The tip of the long side of the arm 104 is pivotally supported by a bearing 105 so as to be swingable. The diameter measuring device 30 is connected to the measuring frame 107 via a cable bear 106. When the measuring cylinder 40 of FIG. 2 is actuated, the diameter measuring device 30 advances from the retracted position shown in FIG. 14 to the axial side of the roll 1, and the diameter of the roll 1 can be measured as in the embodiment of FIG. . When the diameter measuring device 30 is arranged on the side facing the grindstone 19 in this manner, the axial position for measuring the diameter of the roll 1 should be aligned with the position where the grindstone 19 grinds the roll 1, as shown in FIG. You can

As shown in FIGS. 16 and 17, FIG.
Roll the abrasive agent discharged from the abrasive agent nozzle 103 of
A wiper device 110 is provided for removal from the surface of the. The wiper device 110 can press the blade 112 provided at the tip of the air cylinder 111 against the outer peripheral surface of the roll 1 to remove the abrasive. The blade 112 is formed of an elastic body such as rubber, and an air nozzle 113 is provided in the vicinity thereof.

In each of the above embodiments, the grindstone 19 is the grindstone base 1
Relative movement is achieved by being mounted on 8 and moving only in a direction perpendicular to the axial direction of the roll 1 and by sliding displacement of the roll 1 in the axial direction. However, the roll 1 may be fixed and the grindstone 19 may also move in the axial direction of the roll 1 to realize relative movement between the two.

[0046]

As described above, according to the present invention, a plurality of rollers are provided at the tip of the abutting means, the circular cross-section work piece is driven to rotate, and the eddy current flaw detection coil is moved relative to the axial direction of the circular cross-section work piece. While moving, it is possible to perform eddy current flaw detection of surface flaws on the outer peripheral surface of the circular cross-section workpiece. Since the circular cross-section work piece is supported on the center axis with high precision and the relative movement in the axial direction is also performed with the high precision that the polishing device has, surface flaws can be detected automatically and with high precision. The amount of polishing required for the removal can be corrected with high accuracy.

Further, according to the present invention, the abutting means provided with the eddy current flaw detection coil can be installed on the grindstone base or the like, and can be relatively moved in the axial direction of the circular workpiece having the circular cross section like the grindstone.

Further, according to the present invention, it is possible to display the position where the surface flaw is detected by the eddy current flaw detection. This allows the inspector to easily confirm the position of the surface flaw that is automatically detected. Further, even when a plurality of surface flaws are detected, it is possible to easily confirm the position of each individual surface flaw, and for example, it is possible to facilitate the investigation of the cause of the surface flaw.

Further, according to the present invention, the diameter of the grindstone can be calculated by using the diameter measuring means of the workpiece having a circular cross section. As a result, even if the grindstone wears,
The amount of polishing can be corrected with high accuracy.

Further, according to the present invention, for measuring the diameter of the grindstone, the position where the grindstone contacts the circular cross-section workpiece is detected from the increase in the load current of the motor for driving the feeding means. Even in a polishing apparatus which does not have a dedicated means, the grinding wheel diameter measuring function can be easily realized.

Further, according to the present invention, the diameter of the grindstone is calculated based on the distance between the grindstone and the interval detecting means. Since the diameter of the grindstone can be calculated directly, accurate and quick measurement can be performed.

Further, according to the present invention, the gap detecting means detects the gap between the grindstone and the outer peripheral surface by utilizing the pressure change of the air jetted from the nozzle. By the principle of the air micrometer, the distance can be detected easily and with high accuracy.

Further, according to the present invention, when the grindstone is continuously used, the calculated value of the previous diameter can be effectively utilized to shorten the low-speed feeding time by the feeding means.

Further, according to the present invention, the surface flaw of the outer peripheral surface of the circular cross section workpiece is detected by the eddy current flaw detection means, and the cutting amount of the grindstone is corrected based on the diameter of the grindstone measured by the diameter measuring means, Polishing can be performed to remove surface flaws. This ensures removal of surface defects and avoids excessive polishing.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the embodiment shown in FIG.

FIG. 3 is a simplified side view showing a configuration for surface scratch detection of the embodiment of FIG.

4 is a side view showing a part of an eddy current flaw detection head 33 in cross section. FIG.

FIG. 5 is a front view showing a part of an eddy current flaw detection head 33 in cross section.

FIG. 6 is a plan view showing a state in which a marking device 45 is added to the eddy current flaw detection head 33.

FIG. 7 is a side view showing a state in which a marking device 45 is added to the eddy current flaw detection head 33.

8 is a front view of the marking device 45. FIG.

FIG. 9 is a graph showing frequency characteristics upon eddy current flaw detection.

FIG. 10 is a simplified side view showing a configuration for measuring a roll diameter.

11 is a side view showing the configuration of the diameter measuring device 30. FIG.

FIG. 12 is a simplified side view showing a configuration for measuring the diameter of a grindstone 19.

FIG. 13 is a side view showing a simplified configuration of another embodiment of the present invention.

FIG. 14 is a simplified side view showing a configuration for surface flaw detection and roll diameter measurement according to the embodiment of FIG.

FIG. 15 is a simplified plan view showing a configuration for surface flaw detection and roll diameter measurement in the embodiment of FIG.

16 is a partial side view of the wiper device 110 in the embodiment of FIG.

17 is a plan view of the tip of the wiper device 110 in the embodiment of FIG.

[Explanation of symbols]

 1 roll 2 roll grinder 3 roll attaching / detaching device 5 control device 6 keray 11 processing table 12a main spindle 13a core push shaft 16 processing table motor 18 grindstone head 19 grindstone 20 grindstone motor 23 grindstone motor 25 encoder 26 vibration isolation device 27 spindle motor 30 Diameter measuring device 33 Eddy current flaw detection head 42 Memory 43 Eddy current flaw detection coil 45 Marking device 46 Current detection circuit 50 Mounting base 53 Inspection roller 54 Guide roller 55 Spring 61 Choke 71 Upper contact 72 Lower contact 80 Photoelectric switch 90 Air sensor 110 Wiper device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B24B 49/16

Claims (9)

[Claims] 1. A device for polishing an outer peripheral surface of a circular cross-section workpiece which is rotatably supported on a central axis by a grindstone that relatively moves in the axial direction while rotating, and a tip portion contacts the outer peripheral surface of the circular cross-section workpiece. An abutting means capable of switching between a contacting state and a state of separating from the outer peripheral surface; a plurality of abutting rollers provided at the tip of the abutting means at intervals in the circumferential direction of the circular cross-section workpiece; With the eddy current flaw detection coil placed between the contact rollers and the contact means in contact with the outer peripheral surface of the circular cross-section workpiece, the circular cross-section workpiece is rotationally driven while the contact means is moved in the axial direction. And a control means for correcting the polishing amount by performing eddy current flaw detection for detecting surface flaws by the output from the eddy current flaw detection coil and controlling the polishing amount. 2. The polishing apparatus for a circular cross-section workpiece according to claim 1, wherein the abutting means moves together with the grindstone in the axial direction of the circular cross-section workpiece. 3. The contact means is provided with a display means for displaying the detected position of the surface flaw on the outer peripheral surface of the circular cross-section workpiece in response to the flaw detection output from the eddy current flaw detection coil. The polishing apparatus for a circular workpiece having a circular cross section according to claim 1 or 2. 4. A diameter measuring device for measuring the diameter of a circular cross-section workpiece in an apparatus for polishing an outer peripheral surface of a circular cross-section workpiece rotatably supported on a central axis by a grindstone position which relatively moves in the axial direction while rotating. Means, a feeding means for moving the grindstone in a direction perpendicular to the axis of the circular cross-section workpiece, and a cross section when the grindstone has a predetermined reference value and the grindstone contacts the outer peripheral surface of the circular cross-section workpiece. Distance setting means for setting the distance between the axes of the circular workpiece and the grindstone, contact detection means for detecting the contact state between the grindstone and the circular workpiece in cross section, and response to the detection output from the contact detection means Then, after the grindstone is moved perpendicularly to the axis by the feeding means so that there is a gap between the axes from the circular work piece with the distance set by the distance setting means, the grindstone is cut at a speed lower than this moving speed. Approach a circular workpiece Polisher circular cross section workpiece to calculate the diameter distance from the grindstone of between the axes, characterized in that it comprises an arithmetic control means for correcting the polishing amount when the grinding wheel is brought into contact with a circular cross-section workpiece. 5. The polishing apparatus for a circular cross-section workpiece according to claim 4, wherein the contact detecting means detects the contact state from an increase in load current of a motor driving the feeding means. 6. An apparatus for polishing an outer peripheral surface of a circular-section circular workpiece, which is rotatably supported on a central axis, by a grindstone that relatively moves in the axial direction while rotating, and is provided at a predetermined position, and is rotated at a reference position. Distance measuring means for measuring the distance to the outer peripheral surface of the grindstone, feeding means for moving the grindstone in the radial direction, distance between the distance measuring means and the axis of the grindstone when the diameter of the grindstone has a predetermined reference value In response to the detection output from the distance setting means and the distance detection means, the feed means moves the grindstone so that the distance between the distance measuring means and the axis of the grindstone is equal to the distance set by the distance setting means. After that, the grindstone is moved closer to the distance measuring means at a speed lower than this moving speed, and the diameter of the grindstone is calculated from the distance between the axis of the grindstone and the distance measuring means, the detection output of which is a predetermined reference output. And,
A polishing apparatus for a circular cross-section workpiece, comprising: arithmetic control means for correcting the polishing amount. 7. The interval detecting means ejects air from the nozzle toward the outer peripheral surface of the rotating grindstone, and detects the interval from the nozzle to the outer peripheral surface of the grindstone by the pressure of the ejected air. The polishing device for a circular cross-section workpiece according to claim 6. 8. The cross-section circular work according to claim 4, wherein the distance setting means is set with a distance corresponding to the diameter of the grindstone calculated in the previous measurement. Equipment for polishing objects. 9. An apparatus for polishing an outer peripheral surface of a circular-section circular workpiece, which is rotatably supported on a central axis, by a grindstone that relatively moves in the axial direction while rotating, while abutting the outer peripheral surface of the circular-section circular workpiece. In response to the output from the eddy current flaw detection means and the diameter measurement means, the eddy current flaw detection means for detecting the surface flaw of the circular cross section workpiece by the eddy current flaw detection, the diameter measurement means for measuring the diameter of the grindstone,
When a surface flaw is detected, a control means for setting a polishing amount corresponding to the depth of the detected surface flaw and controlling the cutting amount of the grinding stone according to the measured diameter of the grinding stone so as to correspond to the set polishing amount. A polishing device for a circular workpiece having a circular cross section.