JP2019089154A - Truing device and truing method for screwed grinding wheel - Google Patents

Abstract

To obtain a screwed grinding wheel which suppresses a truing amount and has a high lifetime, and to provide a truing device and a truing method for a screwed grinding wheel capable of shortening working time in truing.SOLUTION: In a truing device 50 for a screwed grinding wheel, a controller 54 comprises a tooth groove approach processing part 55C that makes a truer 52 approach the space in a tooth groove 27c, a contact processing part 55D that relatively moves the truer having approached the tooth groove in a first axial direction to make a contact with a tooth face 27a2, a contact position storage part 55E that stores a contact position Po at a point of time where a truing signal S1 is output, a start position set processing part 55F that set a truing starting position when starting truing with the truer on the basis of the contact position, and a truing processing part 55G that performs truing after moving the truer to the truing start position.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a truing device and a truing method of a threaded grinding wheel.

  Heretofore, in a gear grinding machine for processing various gears using a screw-like grindstone, the tooth surface of the screw-like grindstone is corrected by truing (or dressing) in order to improve the processing accuracy (for example, patent documents 1-3) reference). The truing (dressing) is performed, for example, using a disc-like thrur. Usually, when such truing (dressing) is performed, the operator brings the tip of the tular into contact with the tooth surface of the screw-like grindstone in a state where the screw-like grindstone is stopped, and truings the position where the control device contacts. It memorizes as the starting point of (dressing). Then, the control device moves to the start point where the turua is stored, cuts from the start point in the depth direction (thickness direction) of the tooth surface by a predetermined depth set in advance, and truing (dressing) of the tooth surface Do.

JP, 2016-78186, A Patent No. 4099258 Patent No. 4721544

  However, the tooth surface of the screw-like grindstone may have undulations (vibrations) in the circumferential direction and the radial direction. For this reason, when the worker brings the tip of the tsurua into contact with the tooth surface of the screw-like grindstone which has stopped, the contacting portion may be the bottom of the undulation of the tooth surface. In this case, the starting point of truing (dressing) is at the bottom, and when truing (dressing) is performed, it starts from the bottom of the tooth surface. Therefore, when the tsurua is cut in by a predetermined amount, it may be cut by a depth more than necessary in the depth direction of the tooth surface, which may shorten the life of the threaded grinding stone. In addition, it takes too much time for a worker to detect the start position by bringing the tip of the tsurua into contact with the tooth surface of the screw-like grindstone with his / her hand.

  An object of the present invention is to provide a truing device of a screw-like grindstone capable of reducing a truing amount and obtaining a long-lived screw-like grindstone and shortening a working time in truing, and a truing method using the truing device. .

(1. First embodiment of the truing device)
A truing device for a screw-like grindstone according to a first aspect rotatably supports a screw-like grindstone having a helical tooth line formed with a predetermined twist angle on the outer periphery of a cylinder, around a first axis. An outer circumferential surface or a circumferential surface of the tooth line of the thread-like grindstone which is rotatably supported around the first axis of rotation and the second axis, moves relative to the second axis and the direction perpendicular to the second axis, and rotates. A contact detection unit that performs truing on a tooth surface, a contact detection unit that outputs a contact detection signal when the contact is moved to come close to the tooth line and contact the outer circumferential surface or the tooth surface; And a controller configured to move at least one of the threaded grinding wheels to a desired position and control rotation to implement the truing.

  And while the said control apparatus rotates the said thread-like grindstone continuously more than predetermined rotation speed, the space in the tooth gap between the said tooth lines of the said thread-like grindstone which adjoins the said wheel in the said 1st axial direction In a tooth groove entry processing unit for entering the tooth groove, and in a state in which the screw-like grinding stone is continuously rotated at the predetermined rotational speed or more, And a contact processing unit that causes the contact detection unit to output the contact detection signal by causing the contact detection unit to contact with the tooth surface, and the time when the tsurua contacts the tooth surface and the contact detection signal is output. When the truing is started by the wheel based on the contact position storage unit storing the contact position which is the position of the tsurua at the position of the contact and the contact position stored in the contact position storage unit A start position setting processing unit for setting a truing start position, at the time of execution of the truing, and a truing unit for executing said truing After moving the truer on the truing start position.

  As described above, in the contact processing unit, in a state where the threaded grinding wheel is continuously rotated at a predetermined rotational speed or more, the wheel is brought close to and brought into contact with the tooth surface. At this time, by making the rotational speed of the screw-like grinding wheel equal to or higher than a predetermined rotational speed, the slope is closer to the top of the undulation than the bottom, not the bottom of the undulation of the tooth surface when the turua contacts the tooth surface. It is possible to contact the turua at any position of After that, the truing processing section can start truing from the position (truing start position) of the tooth surface with which the ture contacts, thereby reducing the truing amount on the tooth surface as compared with the case where truing is started from the bottom. As a result, the life of the thread-like grinding wheel is increased. Further, since the truing start position on the tooth surface of the threaded grinding wheel is automatically detected by the control of the control device, the time required for the truing work can be shortened.

(2. Second aspect of the truing device)
In the truing device for a screw-like grindstone according to the second aspect, a screw-like grindstone having a helical tooth line formed with a predetermined twist angle on the outer periphery of a cylinder is rotatable about a first axis. The outer circumference of the tooth line of the thread-like grinding wheel, which is rotatably supported around the first axis of rotation and the second axis, moves relative to the second axis and the direction perpendicular to the second axis, and rotates A contact detection unit which performs truing with respect to a surface or a tooth surface, a contact detection unit which outputs a contact detection signal when the contact is moved to come close to the tooth and contact the outer circumferential surface or the tooth surface; And a control device for moving at least one of the threaded grinding wheels to a desired position and controlling rotation to implement the truing.

  The control device further includes a tooth groove entry processing unit for causing the torus to enter a space in a tooth groove between the teeth of the thread-like grindstone adjacent in the first axial direction, and the thread-like grindstone Continuously rotating at the rotational speed of the tooth space and setting the clearance which has entered the space in the tooth space to a predetermined clearance greater than 0 between the tooth surface and the tooth space, And the contact detecting unit to output the contact detection signal by the contact detecting unit while relatively moving the tsurua in the first axial direction so as to move in synchronization with the rotation of the gear, and The process of moving in the first axial direction to have the predetermined gap exceeding 0 between the truer and the tooth surface is within the predetermined phase range in the direction of the tooth surface of the tooth surface. A touch detection signal is output And a contact position storage unit for storing the contact position which is the position of the tsurua at the time when the contact detection signal is finally output in the contact processing unit, and the contact position storage unit. A start position setting processing unit that sets a truing start position when the truing is started by the toru based on the contact position, and after the toru is moved to the truing start position when the truing is performed And a truing processing unit that executes the truing.

  As described above, in the contact processing unit, the screw-like grindstone is continuously rotated at a predetermined rotation speed, and the above-mentioned turr that has entered the space in the tooth groove is a predetermined gap exceeding 0 with the tooth surface. In the state of having it, while relatively moving the truer in the first axial direction so that the truer moves in synchronization with the rotation of the tooth surface, the contact detection portion is brought into contact with the contact portion of the tooth surface and the contact detection signal is The output is made to move the tsurua in the first axial direction so that the predetermined clearance exceeding 0 is provided between the tsurua and the tooth surface. Then, such processing is repeated each time a contact detection signal is output within a predetermined phase range in the direction of the tooth surface of the tooth surface, and the highest position among the undulations of the tooth surface in the predetermined phase range is determined. Explore. After that, the truing processing unit sets one of the positions of the tooth surfaces in contact with the true as the truing start position, and the truing is started from the truing start position, compared with the case where the truing is started from the bottom. The amount of truing on the surface can be reduced. As a result, the life of the thread-like grinding wheel is increased. Further, since the truing start position on the tooth surface of the threaded grinding stone can be automatically detected by the control of the control device, the time required for the truing operation can be shortened.

(3. First aspect of the truing method)
A first aspect of the truing method is the truing method of a screw-like grindstone using the truing device according to the first aspect, wherein the screw-like grindstone is continuously rotated at a speed higher than the predetermined rotational speed. A step of advancing a tooth groove into the space in the tooth space between the teeth of the threaded wheel adjacent in the first axial direction, and a step of advancing the threaded wheel at the predetermined rotational speed or more In the state of being continuously rotated, the contact is moved relative to at least one of the first axial direction with respect to the tooth groove to make contact with the tooth surface, and the contact detection unit makes the contact A contact process for outputting a detection signal and storing a contact position, which is the position of the tsurua at the time when the contact detection signal is output, in the contact position storage unit; A start position setting step of setting a truing start position when the truing starts the truing based on the contact position stored in the storage unit; and moving the trure to the truing start position at the time of performing the truing And a truing step of performing the truing after the step. Thereby, the same effect as the effect obtained in the first aspect of the truing device can be obtained.

(4. Second aspect of the truing method)
A second aspect of the truing method is the truing method of a screw-like grindstone using the truing device according to the second aspect, wherein the turua is adjacent to the first axial direction of the screw-like grindstone. A step of advancing the tooth space into the space between the teeth and the space between the teeth, and continuously rotating the screw-shaped grinding wheel at the predetermined rotational speed, and moving the wheel into the space within the tooth space After the predetermined clearance above 0 is provided between the tooth surfaces, the tsurua is relatively moved in the first axial direction so that the tsurua moves in synchronization with the rotation of the tooth surfaces. While making contact with the contact portion of the tooth surface and causing the contact detection unit to output the contact detection signal, moving the tsurua in the first axial direction to exceed 0 between the tsurua and the tooth surface Said predetermined gap The processing for setting the state having the above is repeatedly performed each time the contact detection signal is output in the predetermined phase range in the direction of the tooth surface of the tooth surface, and the time when the contact detection signal is output last A truing start position when the truing is started by the turu based on the contact step of storing the contact position which is the position of the tsurua in the contact position storage unit and the contact position stored in the contact position storage unit A start position setting process step of setting the truing process, and a truing process step of performing the truing after moving the truer to the truing start position when the truing is performed. Thereby, the same effect as the effect obtained in the second aspect of the truing device can be obtained.

It is a front view of the schematic of the gear grinding machine which is embodiment of this invention. It is a side view of the gear grinding machine of FIG. It is the front view which showed the state at the time of performing truing in the gear grinding machine of FIG. In FIG. 3, it is an enlarged view of the state which accumulated the puller 52 and the thread-like grindstone. It is a block diagram of the truing apparatus which concerns on 1st embodiment. It is a figure explaining an outer diameter detection process. It is a figure explaining a tooth space position detection process. It is a figure explaining a tooth space approach process. It is a 1st figure explaining a contact treatment process. It is a 2nd figure explaining a contact treatment process. It is the figure which showed the movement state of the tsurua in the contact treatment process by the graph of the axial direction position of a turua, and a phase. It is the flowchart 1 of the whole process of truing. It is the flowchart 2 of an outer diameter detection process. It is flowchart 3 of a tooth-groove position detection process. It is flowchart 4 of a tooth-groove approach process, a contact process, a start position setting process, and a truing process. It is a block diagram of the truing apparatus which concerns on 2nd embodiment. It is a 1st figure explaining the contact process concerning 2nd embodiment. It is a 2nd figure explaining the contact process concerning 2nd embodiment. It is a 3rd figure explaining the contact process which concerns on 2nd embodiment. It is the flowchart 5 of a contact process etc. which are parts which differ from 1st embodiment in 2nd embodiment.

<1. First embodiment>
(1-1. Configuration of gear grinding machine 10)
An example of a gear grinding machine 10 provided with a truing device 50 according to a first embodiment of the present invention will be described based on the drawings. The gear grinding machine 10 includes a bed 11, a movable table 12, a ball shaft 13, a ball nut 14, a motor 15, a headstock 16, a tailstock 17, a truing device 50, and a control device 90. Equipped with

  As shown in the front view of FIG. 1, the movable table 12 is horizontally movably mounted on the bed 11. The ball nut 14 is fixed to the lower surface of the movable table 12. The ball nut 14 is screwed into the ball shaft 13 inserted into the bed 11.

  The controller 90 controls the rotation of the motor 15 attached to one end of the bed 11 to rotate the ball shaft 13 forward and reverse. As a result, the movable table 12 moves forward and backward along the ball nut 14 in the lateral direction (X direction) in the drawing along with the ball nut 14. The movable table 12 is mounted on the movable table 12 so that the headstock 16 and the tailstock 17 are opposed to each other and movable on the movable table 12 in the horizontal direction in the drawing.

  As shown in the side view of FIG. 2, a column 23 is provided upright on the rear side (right side in the drawing) of the movable table 12. A rotary table 18 is rotatably supported by a horizontal shaft 44 on the front surface of the column 23. A grinding wheel stand 19 is supported on the front surface of the rotating table 18. On the back surface of the rotating table 18, a shaft 20 which is rotated about its axis by a motor 45 fixed to the column 23 is provided in the vertical direction in FIG.

  A worm 21 that rotates integrally with the shaft 20 is fixed to the shaft 20. The worm 21 meshes with a worm wheel 22 provided on the outer periphery of the horizontal shaft 44. As a result, when the motor 45 is operated to rotate the worm 21 forward and reverse, the rotating base 18 rotates around the horizontal shaft 44.

  Further, a ball shaft 47 rotated by a motor 46 fixed to the bed 11 and a ball nut 48 fixed to the column 23 and screwed with the ball shaft 47 are provided at the lower part of the column 23. With such a configuration, when the control device 90 operates the motor 46, the ball shaft 47 rotates and the column 23 moves back and forth in the front-rear direction parallel to the horizontal axis 44 (horizontal direction in FIG. 2).

  A control device 90 controls the rotation of a motor 41 fixed to the rotation table 18 on the rotation table 18, and a ball shaft 42 rotates in forward and reverse directions, and a ball nut fixed to the grinding wheel table 19 and screwed with the ball shaft 42 43 are provided. With such a configuration, when the ball shaft 42 is rotated by the control of the control device 90, the grindstone table 19 moves in the vertical direction (Y direction).

  When the grinding process is performed by the gear grinding machine 10 having the above configuration, first, as shown in FIG. 1, an object to be ground 30 (a workpiece (workpiece) between the chuck 28 of the headstock 16 and the tailstock 17 Support the axis of) horizontally. Then, the control device 90 controls the motor 15, the motor 41 and the motor 46 to relatively move the screw-like grindstone 27 and the object to be ground 30, and uses the screw-like grindstone 27 mounted on the spindle 26 of the grindstone table 19. The grinding process of the object to be ground 30 is performed.

  At this time, in the case where the object 30 to be ground is a worm gear, the first axis 51 a of the screw-like grindstone 27 is directed in the vertical direction. Then, the worm gear is ground by rotating the screw-like grindstone 27 and the worm gear (the object to be ground 30) so as to have the same relationship as the relationship between the worm gear and the other gear engaged with the worm gear. In addition, as shown in FIG. 4, the thread-like grindstone 27 in this embodiment is provided with a helical tooth line 27a formed with a predetermined twist angle γ ° on the outer periphery of the cylinder.

  In the above, each motor is provided with an encoder, and detects the absolute position of the movable table 12, the column 23, the rotary table 18, the grinding wheel head 19, the screw-shaped grinding wheel 27 and the like controlled by each motor. Each absolute position and absolute phase (angle) to be detected are transmitted to the control device 90 and stored in the storage device 56 in association with each time.

(1-2. Truing device 50)
The truing device 50 will be described mainly based on the schematic view shown in FIG. The truing device 50 is a device for truing an outer peripheral surface 27a1 (tooth tip) and a tooth surface 27a2 of a tooth line 27a of the screw-like grindstone 27 (see FIG. 5).

  As shown in FIG. 5, the truing device 50 includes a first rotation shaft 51, a follower 52, an AE sensor 53 (corresponding to a contact detection unit), a control device 54, and a rotation drive device. The controller 54 is a part of the controller 90. Further, the control device 54 includes a processing device 55 that controls each drive circuit, a storage device 56, a display device (not shown), an input device, and the like.

  The storage device 56 stores a grinding program of the object 30 to be ground, a truing program of the screw-like grindstone 27, and the like. The storage device 56 is connected to each processing unit, the AE sensor 53, etc., though not shown. Further, various data are input to the storage device 56 by an input device (not shown). The input device is provided with a keyboard for inputting data and the like, and a display device such as a CRT for displaying data.

  The rotational drive device includes a drive circuit and motors 511 and 57. The first rotation shaft 51 and the follower 52 are rotationally driven around respective axes by rotating the motors 511 and 57. The rotational drive device is controlled by each processing unit of the processing device 55. Further, the motor 511 includes an encoder 512, and detects an absolute angle of the first rotation shaft 51 controlled by the motor 511. Each absolute position and absolute phase (angle) to be detected are transmitted to the storage device 56, and are stored in the storage device 56 in association with each time.

  In the present embodiment, the first rotation shaft 51 is the spindle 26 of the grinding wheel 19 described above. The first rotation shaft 51 (spindle 26) is rotationally driven by a motor 511 fixed to the upper surface of the grinding wheel head 19. Further, the first rotation shaft 51 rotatably supports the screw-like grindstone 27 around a first axis 51 a which is an axis of the first rotation shaft 51. And in FIG. 1, the 1st rotating shaft 51 is arrange | positioned facing the perpendicular direction.

  However, when the truing device 50 is operated and the tooth surface 27a2 of the screw-like grinding stone 27 is truled by the trulier 52, the motor 45 (see FIG. 2) is operated by the control of the processing device 55, the worm 21 and The rotating base 18 rotates about the horizontal shaft 44 via the worm wheel 22. Thereby, as shown in FIG. 3, the first rotation axis 51 is disposed in a state where the first axis 51 a has an inclination angle γ ° with respect to the vertical direction.

  The puller 52 is rotatably supported by an elongated support member 521 vertically provided on the upper surface of the rear portion of the movable table 12. Specifically, the puller 52 is rotatably supported by a second rotation shaft 522 which is provided so as to protrude from the upper end of the support member 521 and is rotatably provided. The second rotation shaft 522 is disposed such that a second axis 522 a which is an axis is directed in the vertical direction. Then, the motor 57 incorporated in the support member 521 is connected to the second rotation shaft 522, and the rotation of the motor 57 causes the wheel 52 to rotate. The motor 57 is connected to the processing unit 55 via a drive circuit, and is controlled to rotate by the processing unit 55.

  From the above, at the time of truing, the second rotation shaft 522 is inclined relative to the first axis 51a by γ ° which is an angle equal to the predetermined twist angle γ ° of the tooth ridge 27a of the screw-like grindstone 27 ( See Figure 3). As a result, the second axis 522a of the second rotation shaft 522 and the tooth line 27a of the screw-like grindstone 27 are substantially orthogonal to each other at the point where the contact 52 and the screw-like grindstone 27 contact (see FIG. 4). However, the relative inclination angle of the second axis 522 a with respect to the first axis 51 a is not limited to the above embodiment, and may not be equal to the twist angle γ ° of the tooth bar 27 a. The relative inclination angle may optionally be set as γ ° ± α ° centering on the twist angle γ °. Also, the value may be set to any value regardless of the twist angle γ °.

  Further, the truer 52 is a disk-like member. The puller 52 is rotatably supported on a second rotation shaft 522 having a second axis 522a so as to rotate in a horizontal plane around the second axis 522a. The rotation axis of the pulley 52 and the second axis 522 a are coaxially arranged.

  As shown in FIG. 4, the cross-sectional shape of the tips 523 of the disk-shaped through holes 52 has an acute angle, and contact portions 524 in contact with the tooth surfaces 27a2 of the screw-like grindstone 27 are formed on the upper and lower surfaces. . Diamond fine particles are uniformly attached to the entire surface of the tip 523 and the contact portion 524. Then, when the truer truings the outer circumferential surface 27a1 (tooth tips) or tooth surface 27a2 of the tooth line 27a of the screw-like grindstone 27, the truer 52 carries out the second axial line 522a direction and A truing is performed on the tooth surface 27a2 of the screw-like grindstone 27 while having a component in a direction orthogonal to the second axis 522a and moving relatively.

  Actually, in the present embodiment, the screw-like grindstone 27 moves in the left-right direction (front-rear direction (Z direction)) and up-down direction (Y direction) in FIG. Direction) is movable. As a result, the pulley 52 and the screw-like grindstone 27 move relative to each other on a line parallel to the first axis 51 a and the Z direction, and the crane 52 performs desired truing on the tooth surface 27 a 2 of the screw-like grindstone 27.

  As shown in FIG. 1, the AE sensor 53 (contact detection unit) is fixed to a part of the support member 521 of the pulley 52. The AE sensor 53 detects a contact when the puller 52 moves relative to the screw-like grindstone 27 and contacts the outer peripheral surface 27a1 or the tooth surface 27a2 of the tooth line 27a of the screw-like grindstone 27. And AE sensor 53 outputs contact detection signal S1, and transmits to processing unit 55 (control unit 54). The AE sensor 53 may be fixed to the threaded grinding wheel 27 side.

  The AE sensor 53 is a known sensor that detects an elastic wave (acoustic emission (AE)) such as a breaking sound wave of the thread-like grindstone 27 generated when the contact 52 and the thread-like grindstone 27 contact. As it is known, further detailed description will be omitted.

  As described above, the control device 54 includes the processing device 55 and the storage device 56 (contact position storage unit 55E). Then, the processing device 55 includes an outer diameter detection processing unit 55A, a tooth groove position detection processing unit 55B, a tooth groove entry processing unit 55C, a contact processing unit 55D, a start position setting processing unit 55F, and a truing processing unit 55G. And. In the present embodiment, the truing start position on the tooth surface 27a2 of the screw-like grindstone 27 at the start of truing mainly by the processing of the tooth groove approach processing unit 55C, the contact processing unit 55D, and the start position setting processing unit 55F. Setting.

  The outer diameter detection processing unit 55A is a processing unit that automatically detects the maximum diameter φDmax among the outer diameters of the outer peripheral surface 27a1 of the screw-like grindstone 27. Although the details will be described later, the outer diameter detection processing unit 55A rotates the screw-like grindstone 27 around the first axis 51a at a predetermined rotational speed, and moves in the front-rear direction (Z direction) toward the pulley 52. Move it. Then, the tip 523 or the contact portion 524 of the truer 52 is brought into contact with the outer peripheral surface 27a1 of the screw-like grindstone 27 on a line parallel to the first axis 51a and the Z direction, and the maximum diameter φDmax of the outer peripheral surface 27a1 is detected. At this time, the predetermined rotational speed is set based on the speed at which the pulley 52 relatively moves in the Z direction toward the outer peripheral surface 27a1. That is, the predetermined rotational speed is a rotational speed that allows the largest outer diameter portion (including the vicinity) of the outer peripheral surface 27a1 to first contact with the tsurua 52 when the outer peripheral surface 27a1 approaches the pulley 52. Set to

  The tooth groove position detection processing unit 55 </ b> B is a processing unit that roughly detects the position of the tooth groove 27 c of the screw-like grindstone 27. The tooth groove 27c referred to here is a space between two tooth lines 27a of the screw-like grindstone 27 adjacent in the direction of the first axis 51a. Accordingly, the two tooth surfaces 27a2 (first tooth surface) and 27a2 (second tooth surface) are disposed opposite to each other on both sides of the tooth groove 27c in the direction of the first axis 51a, and the bottom portion is provided with the tooth bottom. 27a3 is provided. The first tooth flank 27a2 and the second tooth flank 27a2 will be used in the following description of the operation.

  In the present embodiment, it is assumed that the tooth streaks 27 a of the thread-like grindstone 27 are formed by a single line of tooth streaks. In FIG. 3, it is assumed that it is formed by the three rows of tooth muscles 27aA, 27aB, 27aC. In order to roughly determine the position of the tooth groove 27c with respect to the thread-like grindstone 27 formed in this manner, there is a method shown below as a known method. In that method, as shown in FIG. 7 in which the screw-like grindstone 27 is viewed from the axial direction, with respect to the screw-like grindstone 27 not rotating continuously, with respect to three rotational phases D, E, F in the rotational direction B. And the puller 52 is made to approach the tooth space 27c from the same reference position. Then, the position of the contact 52 which is in contact with each phase is stored, and the phase where the contact timing (time to contact) from the reference position is the slowest, that is, the position of the phase where the contact 52 is deeply entered It is

  At this time, in each of the three rotational phases D, E and F, the angle between the rotational phase D and the rotational phase E in the rotational direction B and the angle between the rotational phase E and the rotational phase F If there are three lines, each should be at least 40 degrees calculated by at least 360 degrees / number of lines / 3. That is, in the case of three teeth, if the angle between the phases is 40 °, the rough position of the tooth space can be determined. Also, in the case of a single line of teeth, if the angle between each phase is 120 °, a rough position of the tooth space can be obtained. For example, in FIG. 7, the contact timing of the puller 52 is delayed most in the rotational phase F. Therefore, it is assumed that the center of the tooth groove 27c is at the position of the rotational phase F, and the subsequent processing is advanced.

  In addition to the above embodiment, when it is desired to obtain the center of the tooth groove 27c more accurately, the following method may be used. That is, in the rotational phase F of the thread-like grindstone 27 measured above, the thread-like grindstone 27 is made to approach the puller 52 and the puller 52 is advanced into the tooth groove 27 c of the thread-like grindstone 27. Thereafter, the screw-like grindstone 27 is rotated in the forward direction about the first axis 51a, and the rotation angle θ1 (not shown) when the contact 52 is in contact with one of the tooth surfaces 27a2 (first tooth surface) is stored. .

  Then, the screw-like grindstone 27 is rotated in the opposite direction about the first axis 51a, and the rotation angle θ2 (not shown) when the contact 52 is in contact with the other tooth surface 27a2 (second tooth surface) is stored. . The average value θm (θm = (θ1 + θ2) / 2) of the rotation angle θ1 and the rotation angle θ2 may be determined, and may be set as the center position of the tooth groove 27c in the thread-like grindstone 27. Thus, the position of the tooth groove 27c can be determined with high accuracy. Therefore, in the tooth groove entry processing unit 55C described below, when the tire 52 is made to enter the space in the tooth groove 27c, the tooth 52 is a tooth of the tooth groove 27c. There is no risk of collision with the surface 27a2 and subsequent processing being impossible.

  The tooth groove entry processing unit 55C is a processing unit for causing the pulley 52 to relatively enter the space in the tooth groove 27c while continuously rotating the screw-like grindstone 27 at a rotational speed Vθ1 which is a speed equal to or higher than a predetermined rotational speed. . At this time, the position of the tooth groove 27c is based on position data (rotational phase F) that is assumed to be at the center of the tooth groove 27c in the tooth groove position detection processing unit 55B. In addition, the depth to be made to enter into the tooth groove 27c in the radial direction is set until the tip 523 of the wheel 52 reaches the PCD (reference pitch circle diameter) position of the thread-like grindstone 27 (see FIG. 8A, two-dot chain line) . The PCD is determined based on the maximum diameter φDmax detected by the outer diameter detection processing unit 55A. However, this is merely an example, and the depth to which the clearance 52 is advanced into the tooth space 27c may be set arbitrarily. Moreover, since PCD is publicly known, detailed description is omitted.

  In the state where the screw-shaped grinding stone 27 is continuously rotated at the rotational speed Vθ1, the contact processing unit 55D moves the pulley 52, which has entered into the tooth groove 27c, relative to the tooth groove 27c in at least one direction of the first axis 51a. It is a processing part which makes it contact tooth flank 27a2, and makes AE detection sensor 53 (contact detection part) contact detection signal S1 (refer to figure 8B). In this embodiment, as shown in FIG. 8B and FIG. 8C, by relatively moving the truer 52 and the screw-like grindstone 27 in the Y direction, the relative move to both sides in the direction of the first axis 51a. I will explain.

  When the rotational speed Vθ1 of the screw-like grinding stone 27 is determined, the “predetermined rotational speed” as a reference is set based on the speed at which the wheel 52 moves relative to the tooth surface 27a2. In other words, the predetermined rotational speed causes the undulation of the tooth surface 27a2 when the puller 52 approaches the tooth surface 27a2 relatively (refer to the vertex a, the intermediate position b, and the bottom c shown in FIGS. 8B and 8C). The rotation speed that enables the top a (including the vicinity) of the first to contact the tsurua 52 first and not at least the bottom c of the undulation.

  Further, in the above, in order to move the puller 52 relative to the tooth groove 27c in the direction of the first axis 51a, "the relative feed speed Vy of the puller to the screw-like grindstone 27 / the rotational speed Vθ of the screw-like grindstone 27" Control may be performed so as to slightly increase or decrease the state in which the pulley 52 and the tooth groove 27c move in synchronization with each other. As a result, as shown in the graph of FIG. 9, the truer 52 moves relative to the tooth groove 27c in the direction of the first axis 51a and eventually contacts the tooth surface 27a2 (see points j and k).

  In addition, the graph of FIG. 9 is the schematic diagram which expand | deployed the tooth space 27c and each tooth surface 27a2. In the graph of FIG. 9, the horizontal axis represents the phase of the tooth groove 27 c, and the vertical axis represents the position of the puller 52 in the first axial direction. As shown in part M of FIG. 9 having a positive inclination, when Vy / Vθ is increased, the puller 52 approaches the tooth surface 27a2 of the tooth groove 27c shown above, and contacts the point 27 at point j. When Vy / Vθ is reduced after contact at point j as shown in part N having a negative inclination, the truer 52 approaches the tooth surface 27a2 shown below and contacts at point k. The broken line in the graph shows the state in which the pulley 52 and the tooth groove 27c move in synchronization with each other.

  The contact position storage unit 55E rotates the screw-shaped grindstone 27 at the time the contact detection signal S1 is output when the contactor 52 moves relative to the screw-shaped grindstone 27 in the direction of the first axis 51a and contacts the tooth surface 27a2. The storage unit stores the phase θ, the position in the first axis 51 a direction (Y direction) of the thread-like grindstone 27, and the position in the front-rear direction (Z direction) as the contact position Po of the wheel 52.

The start position setting processing unit 55F is a processing unit that sets the truing start position P1 when the truer 52 starts truing based on the contact position Po stored in the contact position storage unit 55E. That is, the truing start position P1 is a position corresponding to the position of the vertex a (including the vicinity) of the waviness of the tooth surface 27a2.
The truing processing unit 55G is a processing unit that executes the truing after moving the truer 52 to the truing start position P1. Details will be described in the description of the operation (method).

(1-3. Method of truing)
Next, the truing method will be described mainly based on flowcharts 1 to 4 in FIGS. In order to perform truing, first, as shown in FIG. 3, the rotary table 18 is rotated, and the first axis 51a of the screw-like grindstone 27 is made to include the second axis 522a of the tumbler 52 disposed in the vertical direction. The twist angle γ of the tooth line 27 a of the screw-like grinding wheel 27 is inclined with respect to a plane (in the present embodiment, a plane perpendicular to the paper surface). By inclining the first axis 51a of the screw-like grindstone 27 in this manner, the tooth lines 27a of the screw-like grindstone 27 become parallel to the horizontal surface in a linear shape parallel to the first axis 51a.

  In this state, the movable table 12 is moved to the right in the X direction in FIG. 2, and the screw-like grindstone 27 is moved forward, and stopped immediately before the wheel 52 hits the tooth groove 27 c of the screw-like grindstone 27. A state in which the positional relationship between the screw-like grindstone 27 and the pulley 52 at this time is viewed from the front is shown in FIG. As shown in FIG. 4, the first axis 51 a of the screw-like grindstone 27 is inclined by a twist angle γ of the tooth line 27 a of the screw-like grindstone 27 with respect to the second axis 522 a of the truer 52.

  In such a state, start truing. As an entire truing process, as shown in the flowchart 1 of FIG. 10, an outer diameter detection step S10, a tooth groove position detection step S20, a tooth groove approach step S30, a contact step S40, and a start position setting step S50. And truing process S60.

(1-3-1. Outer diameter detection step S10)
First, the outer diameter detection step S10 processed by the outer diameter detection processing unit 55A will be described based on the flowchart 2 of FIG. The outer diameter detection step S10 is a step of automatically detecting the maximum diameter φDmax out of the outer diameter of the outer peripheral surface 27a1 of the threaded grinding stone 27 as described above. The outer diameter detection step S10 includes steps S101 to S107.

  In step S101, the screw-like grindstone 27 is rotated around the first axis 51a at a predetermined rotation speed Vθ2. At this time, the predetermined rotational speed Vθ2 is such that the largest outer diameter portion (including the vicinity) of the outer peripheral surface 27a1 (tooth tip) first comes in contact with the tsurua 52 when the turbine 52 approaches the outer peripheral surface 27a1. The rotational speed that makes it possible.

  In step S102, the column 23, that is, the screw-like grindstone 27 is advanced in the direction of the wheel 52 (forward direction in the front-rear direction (Z direction)) at a predetermined speed set in advance. That is, the puller 52 moves relative to and approaches the threaded grinding wheel 27 at a predetermined advancing speed (see FIG. 6). At this time, the predetermined advancing speed is a speed corresponding to the predetermined rotational speed Vθ2 of the screw-shaped grinding wheel 27, and a speed at which the outer circumferential surface 27a1 (tooth tips) can initially contact the largest outer diameter portion (including the vicinity). It is. In order to contact the maximum outer diameter portion, the rotational speed Vθ is increased and the forward speed is decreased.

  Next, in step S103, it is determined whether the contactor 52 contacts the largest outer diameter portion of the outer peripheral surface 27a1 (tooth tip) and the AE sensor 53 outputs the contact detection signal S1. If the touch detection signal S1 is output and transmitted to the processing device 55 (control device 54), the process moves to step S104. If the contact detection signal S1 is not output, the processing of step S102 and step S103 is repeatedly executed until the output of the contact detection signal S1 is confirmed in step S103.

  In step S104, the absolute position of the screw-like grindstone 27 displayed on the display device (not shown) is input using the input device (not shown) and stored in the storage device 56. In step S105 (outside diameter detection step S10), the outer peripheral surface 27a1 (when the contact detection signal S1 is detected based on the absolute position of the screw-like grindstone 27 and the diameter (radius) data of the tu The outer diameter (maximum diameter φDmax) of the tip is calculated.

In step S106, the threaded grinding wheel 27 moves (retracts) to the right in FIG. 2 to a position where it is completely separated from the wheel 52.
Thereafter, in step S107 (outside diameter detection step S10), the rotation of the screw-like grinding wheel 27 is stopped.

(1-3-2. Tooth groove position detection step S20)
Next, a tooth groove position detection step S20 processed by the tooth groove position detection processing unit 55B will be described. The tooth groove position detecting step S20 is a step of roughly detecting the position of the phase of the tooth groove 27c of the screw-like grindstone 27. The contents are as described above. Tooth groove position detection process S20 is provided with process S201-process S216.

In step S201, the screw-like grindstone 27 is rotated about the first axis 51a and positioned at a position where the rotational phase is D (see FIG. 7).
In step S202, the threaded grinding wheel 27 is advanced in the direction of the pulley 52.

  In step S203, it is determined whether the AE sensor 53 has output the contact detection signal S1 by the contact of the truer 52 with any part in the tooth space 27c. When the touch detection signal S1 is output and transmitted to the processing device 55 (control device 54), the process moves to step S204. If the touch detection signal S1 is not output, the processes of step S202 and step S203 are repeatedly executed until the output of the touch detection signal S1 is confirmed in step S203.

In step S204, the absolute position Za of the screw-like grinding stone 27 displayed on the display device (not shown) is input to the storage device 56 and stored at the time when the contact detection signal S1 is output. At this time, the absolute position Za is a value that increases as the moving distance of the screw-like grinding stone 27 from the reference position increases. That is, it is a value that increases as the clearance 52 deeply enters the tooth groove 27c. The same applies to absolute positions Zb and Zc described below.
In step S205, the threaded grinding wheel 27 retracts and moves rearward to separate the wheel 52 from the tooth groove 27c.

  Next, the process of step S206 to step S210 (tooth groove position detection step S20) is performed. Steps S206 to S210 correspond to the order of steps S201 to S205, respectively, and perform the same processing. The screw-like grindstone 27 is positioned at the rotational phase D in step S201, but the screw-like grindstone 27 is positioned at the rotational phase E in step S206. Further, in step S204, the absolute position Za of the screw-like grindstone 27 is input to and stored in the storage device 56. However, in step S209 corresponding to step S204, the absolute position Zb of the screw-like grindstone 27 in the rotational phase E is The data is input to and stored in the storage device 56.

  Furthermore, next, the process of process S211-process S215 is performed. Steps S211 to S215 correspond to the steps S201 to S205 and S206 to S210, respectively, in the order of alignment, and perform the same processing.

  In steps S201 and S206, the screw-shaped grindstone 27 is positioned at the rotational phases D and E. However, in the step S211, the screw-shaped grindstone 27 is positioned at the rotational phase F. Further, in steps S204 and S209, the absolute positions Za and Zb of the screw-like grindstone 27 are input to and stored in the storage device 56. However, in step S214 corresponding to steps S204 and S209, the screw-like grindstone in the rotational phase F is The 27 absolute positions Zc are input to the storage device 56 and stored.

  In step S216, the largest value among the absolute positions Za, Zb, and Zc stored in the storage device 56 is selected and stored in the storage device 56. In the present embodiment, the absolute position Zc in the rotational phase F is selected. In other words, it is assumed that the tooth groove 27c has the tooth base 27a3 or the tooth surface 27a2 near the tooth base 27a3 at the position of the rotational phase F.

(1-3-3. Tooth groove approach step S30)
Next, based on the flowchart 4 of FIG. 13, the tooth groove approach step S30, the contact step S40, the start position setting step S50, and the truing step S60 will be described. In the tooth groove approach step S30 processed by the tooth groove approach processing unit 55C, as described above, in the step of relatively moving the puller 52 with respect to the screw-like grindstone 27, the puller 52 is made to enter the space in the tooth groove 27c. is there. In detail, this is a step in which the tooth tips 523 of the tsuru 52 are advanced into the tooth groove 27c so as to be positioned on the pitch circle of the pitch circle diameter (PCD) R1 of the screw-like grindstone 27. Tooth gap approach process S30 is provided with process S301 and process S302.

  In step S301 (tooth groove approach step S30), the screw-shaped grindstone 27 is continuously rotated at a rotational speed Vθ1. Then, the screw-like grindstone 27 is moved in the vertical direction at the moving speed Vy1, and is advanced at the predetermined moving speed Vz1. Thereby, the puller 52 is made to enter the space in the tooth space 27c between the tooth lines 27a of the screw-like grindstone 27 adjacent in the direction of the first axis 51a (see FIG. 8A). At this time, the position of the tooth groove 27c to which the pulley 52 is made to enter is the position of the rotational phase F at which the center of the tooth groove 27c is located in the tooth groove position detection processing unit 55B.

  In step S302 (tooth groove approach step S30), the moving speed Vz1 of the threaded grinding wheel 27 forward (leftward in FIG. 2) is set to 0 at the position where the tip 523 of the wheel 52 reaches the PCD. As a result, the tip 523 of the truer 52 is located on the PCD in the tooth space 27c.

(1-3-4. Contact process S40)
In the contact step S40 processed by the contact processing unit 55D, the tooth tip is made to enter the tooth groove 27c in a state where the screw-shaped grinding stone 27 is continuously rotated at a rotational speed Vθ1 which is a rotational speed equal to or higher than a predetermined rotational speed. This is a step in which the contactor 52 is moved relative to the tooth groove 27c in at least one of the directions of the first axis 51a to contact the tooth surface 27a2, and the AE sensor 53 (contact detection unit) outputs a contact detection signal. The contacting step S40 includes steps S401 to S407.

  In step S401, while keeping the moving speed Vy1 of the screw-like grindstone 27 in the vertical direction constant, the rotational speed Vθ1 of the screw-like grindstone 27 is decelerated to a rotational speed Vθ2 (Vθ2 <Vθ1) smaller than the rotational speed Vθ1. As a result, as described above, the truer 52 moves relative to the tooth groove 27c in the direction of the first axis 51a and eventually contacts the tooth surface 27a2 (see point j in FIG. 9). At this time, under the conditions of the rotational speed Vθ1 and the moving speed Vy1 of the screw-like grindstone 27, the first clutch 52 is synchronized with the tooth groove 27c in the direction of the first axis 51a at the beginning of entering into the tooth groove 27c. It shall be.

  That is, at the beginning of entering into the tooth groove 27c, the truer 52 does not contact the opposing tooth surface 27a2 (first tooth surface) and the tooth surface 27a2 (second tooth surface) in the tooth groove 27c which has entered. It moves relatively in the direction of the axis 51a. Then, by decelerating rotational speed Vθ1 to rotational speed Vθ2 (Vθ2 <Vθ1) smaller than rotational speed Vθ1, wheel 52 in tooth groove 27c is directed to one side in the direction of first axis 51a with respect to tooth groove 27c. Move relative to each other. However, the present invention is not limited to this mode, and it is not necessary to synchronize from the beginning when the tooth approaches the tooth groove 27c.

  In step S402 (contact step S40), it is determined whether the truer 52 contacts the tooth surface 27a2 (first tooth surface) and the AE sensor 53 outputs the contact detection signal S1. When the touch detection signal S1 is output and transmitted to the processing device 55 (control device 54), the process moves to step S402. If the touch detection signal S1 is not output, the processes of step S401 and step S402 are repeatedly executed until the output of the touch detection signal S1 is confirmed in step S402.

  In step S403 (contact step S40), the contact position Po, which is the position of the screw-like grindstone 27 at the time when the contact sensor 52 contacts the one tooth surface 27a2 and the contact detection signal S1 is output, It stores in the device 56). As the contact position Po, there are two contact positions in the tooth height direction and in the tooth thickness direction.

  In step S404 (contact step S40), the rotational speed Vθ2 of the screw-like grinding wheel 27 is increased to a rotational speed Vθ3 (Vθ2 <Vθ1 <Vθ3) larger than the rotational speed Vθ1 while the moving speed Vy1 in the vertical direction is constant. Do. Thereby, the puller 52 in the tooth groove 27c starts relative movement toward the other side in the direction of the first axis 51a with respect to the tooth groove 27c (see FIG. 8C). Then, the truer 52 comes in contact with the other tooth surface 27a2 (see point k in FIG. 9).

  In step S405 (contacting step S40), it is determined whether the truer 52 is in contact with the tooth surface 27a2 (second tooth surface) and the AE sensor 53 outputs the contact detection signal S1. If the touch detection signal S1 is output and transmitted to the processing device 55 (control device 54), the process moves to step S406. If the touch detection signal S1 is not output, the processes of step S404 and step S405 are repeatedly executed until the output of the touch detection signal S1 is confirmed in step S405.

  In step S406 (contact step S40), the contact position Po, which is the position of the screw-like grindstone 27 at the time when the contact sensor 52 contacts the other tooth surface 27a2 and the contact detection signal S1 is output, is stored in the contact position memory 55E. Do. As the contact position Po, there are two contact positions in the tooth height direction and in the tooth thickness direction.

  In step S407 (contact step S40), the rotational speed V.theta.3 of the screw-like grindstone 27 is set to a rotational speed smaller than V.theta.3 again, and after the puller 52 is relatively separated from the tooth surface 27a2 (second tooth surface), the screw shape is formed. The grindstone 27 is retracted to relatively separate the pulley 52 from the tooth groove 27c.

(1-3-5. Start position setting step S50)
In the start position setting step S50 (start position setting processing unit 55F), theoretical cross-sectional shape data of the tooth surface 27a2 (a pair of a plurality of positions in the height direction and a position in the thickness direction) ), The truing start position opposite to the truing start position when the truing 52 is started based on the contact position Po of one tooth surface 27a2 and the contact position Po of the other tooth surface 27a2 stored in the contact position storage unit 55E. It sets with respect to the two tooth flanks 27a2 and 27a2 (the 1st and 2nd tooth flank). When the contact position in the tooth thickness direction of the contact position Po is on the tooth groove side compared with the position in the tooth thickness direction of the theoretical cross-sectional shape data, the theoretical cross-sectional shape data of the tooth surface 27a2 is a screw-shaped grinding wheel When it is set on the outer diameter side of 27 and on the opposite side to the tooth groove, it is set on the inner diameter side of the screw-like grindstone 27.

(1-3-6. Truing process S60)
Then, in the truing step S60, truing is sequentially performed after relatively moving the screw-like grindstone 27 and the puller 52 to the truing start position with respect to the two opposing tooth surfaces 27a2 and 27a2 (first and second tooth surfaces). . The truing is repeated by changing the position in the tooth height direction. When truing by changing the position in the tooth height direction, theoretical cross-sectional shape data of the tooth surface 27a2 set in the radial direction according to the contact position Po is used. At this time, at the truing start position, the position of the tooth flank 27a2 on which the tooth top 523 of the truer 52 is in contact is any position different from the bottom in the waviness of the tooth flank 27a2. For this reason, compared with the case where the truing is started from the bottom of the undulation with respect to the tooth surface 27a2, the removal amount by the truing in the tooth surface 27a2 can be suppressed. Further, in the present embodiment, since the truing start position for truing the tooth surface 27a2 of the screw-like grindstone 27 is automatically set by the control of the control device 54, the time required for the truing operation can be shortened.

  In the above embodiment, in the contacting step S40 to the truing step S60, the truer 52 applies to both tooth surfaces 27a2 of the tooth surface 27a2 (first tooth surface) and the opposing tooth surface 27a2 (second tooth surface). The invention is applied to carry out truing. However, it is not limited to this aspect. In the contact step S40 to the truing step S60, the invention may be applied only to the tooth surface 27a2 of at least one of the tooth surface 27a2 (first tooth surface) and the opposing tooth surface 27a2 (second tooth surface). . At this time, with respect to the truing to the other tooth surface 27a2, the level of the undulation depth of the tooth surface 27a2 is predicted based on the data of one tooth surface 27a2 to which the invention is applied, and the vertex position of the forecasted undulation is trued. It may be set as the start position and truing may be performed. At this time, theoretical cross-sectional shape data of the tooth surface 27a2 (represented by a pair of a plurality of positions in the height direction and a position in the thickness direction) is used.

<2. Second embodiment>
(2-1. Configuration of gear grinding machine 110)
Next, an example of the gear grinding machine 110 provided with the truing apparatus 150 (refer FIGS. 1-3) which concerns on 2nd embodiment is demonstrated based on figures. However, the gear grinding machine 110 differs from the gear grinding machine 10 of the first embodiment only in the control device 154 of the truing device 150. Therefore, only different parts will be described in detail, and the description of the same parts will be omitted.

  As shown in FIG. 14, the control unit 154 of the truing unit 150 includes a processing unit 155 and a storage unit 156 (contact position storage unit 155E). Then, the processing device 155 includes an outer diameter detection processing unit 55A, a tooth groove position detection processing unit 55B, a tooth groove entry processing unit 55C, a contact processing unit 155D, a start position setting processing unit 155F, and a truing processing unit 55G. And. In the present embodiment, the truing start position on the tooth surface 27a2 of the screw-like grindstone 27 is set at the start of truing by the processing of the tooth groove approach processing unit 55C, the contact processing unit 155D, and the start position setting processing unit 155F. Do.

  In the processing unit 155, the contact processing unit 155D rotates the threaded grinding wheel 27 continuously at a predetermined rotation speed, and the clearance 52 which has entered the space in the tooth groove 27c is greater than 0 between the tooth surface 27a2 and the tooth surface 27a2. With a gap d1 (described later). Then, in this state, the contact sensor of the tooth surface 27a2 is brought into contact with the AE sensor 53 (contact while the stylus 52 is relatively moved in the direction of the first axis 51a so that the crane 52 moves in synchronization with the rotation of the tooth surface 27a2 The processing of causing the contact detection signal S1 to be output by the detection unit) and moving the puller 52 in the direction of the first axis 51a to make the puller 52 have a predetermined gap d1 with the tooth surface 27a2 is a tooth surface 27a2 In the predetermined phase range in the direction of the tooth line, the process is repeated each time the contact detection signal S1 is output.

  In detail, the contact processing unit 155D includes a first contact processing unit D1, a second contact processing unit D2, a third contact processing unit D3, and a fourth contact processing unit D4. As shown in FIG. 15A, the first contact processing portion D1 moves the puller 52, which has entered the space in the tooth groove 27c, relative to the tooth groove 27c in at least one of the directions of the first axis 51a. A process of causing the AE sensor 53 (contact detection unit) to make contact with the to-be-contacted portion Q1 and outputting the contact detection signal S1 is performed.

  The second contact processing portion D2 is configured such that the first contact processing portion D1 causes the contact 52 to have a predetermined gap d1 exceeding 0 with the contact portion Q1 after the contact 52 contacts the contact portion Q1. A process of relatively moving in the direction of the first axis 51a separated from the contacted portion Q1 is performed (see FIG. 15B).

  The third contact processing unit D3 is relative to the first axial line 51a so that the third contact processing unit D3 moves in synchronization with the rotation of the tooth surface 27a2 in a state in which the tsurua 52 has a predetermined gap d1 with the contacted part Q1. The toothed portion is moved (see FIG. 15C), and if there is a to-be-contacted portion Q2 (not shown) having a tooth thickness more than the to-be-contacted portion Q1 within a predetermined phase range in the tooth surface 27a2 A process of causing the contact sensor Q (contact detection unit) to contact the contact portion Q2 and causing the contact detection signal S1 to be output is performed.

  In the third contact processing unit D3, the fourth contact processing unit D4 determines the processing in the second contact processing unit D2 and the processing in the third contact processing unit D3 when there is a to-be-contacted portion Q2 with a tooth thickness. The processing unit repeatedly executes within the phase range of The following description will be made using the flowchart of FIG. The outer diameter detecting step S10, the tooth groove position detecting step S20, and the tooth groove entering step S30 are the same as steps S301 and S302 of flowcharts 2, 3 and 4 in FIGS. 11, 12 and 13, respectively. The description is omitted.

(2-2. Truing method)
The operation of the truing method from the state where the puller 52 has entered into the tooth space 27c will be described based on the flowchart 5. In step S141A (corresponding to step S401 of the flowchart 4) in the first contact step S141 (contact step S140) processed by the first contact processing unit D1, the rotational speed Vθ1 of the screw-shaped grinding stone 27 is smaller than the rotational speed Vθ1. It decelerates to Vθ2 (Vθ2 <Vθ1).

  In step S141B (corresponding to step S402 in flowchart 4) in the first contact step S141 (contact step S140), the puller 52 contacts the contacted portion Q1 of the tooth surface 27a2 (first tooth surface) (see FIG. 15A) It is determined whether the AE sensor 53 has output the touch detection signal S1. When the contact detection signal S1 is output and transmitted to the processing device 155 (control device 154), the process proceeds to step S141C (corresponding to step S403 in the flowchart 4). If the contact detection signal S1 is not output, the processes of step S141A and step S141B are repeatedly executed until the output of the contact detection signal S1 is confirmed in step S141B (corresponding to step S402 of the flowchart 4).

  In step S141C (corresponding to step S403 in the flowchart 4) in the first contact step S141 (contact step S140), the contact position Po which is the position of the screw-like grindstone 27 at the time when the contact detection signal S1 is output Store in 155E.

  In the second contact step S142 (contact step S140) processed by the second contact processing unit D2, the rotational speed Vθ2 of the screw-shaped grindstone 27 is set in a state in which the moving speed Vy1 of the screw-shaped grindstone 27 in the vertical direction is constant. The rotational speed is increased to a rotational speed Vθ3 larger than the rotational speed Vθ1. Thereby, the puller 52 in the tooth groove 27c is moved relative to the tooth groove 27c toward the other side in the direction of the first axis 51a until there is a gap d1 with the tooth surface 27a2 (see FIG. 15B) . Although the predetermined gap d1 can be set arbitrarily, it is preferably about several microns.

  In step S143A in the third contact step S143 (contact step S140) processed by the third contact processing unit D3, the screw-shaped grindstone 27 is formed with a predetermined gap d1 between the contact 52 and the tooth surface 27a2. The rotational speed Vθ3 is decelerated again. At this time, the rotational speed to be decelerated is a rotational speed at which the pulley 52 and the tooth groove 27c (that is, the tooth surface 27a2) can move in synchronization.

  In step S143B in the third contact step S143 (contact step S140), the tumbler 52 contacts the tooth surface 27a2 (first tooth surface) within a predetermined phase range in the direction of the tooth surface 27a2 of the tooth surface 27a2, and the AE sensor A determination is made as to whether 53 has output a touch detection signal S1. When the contact detection signal S1 is output and transmitted to the processing device 155 (control device 154), the process moves to step S143C, and each time, the contact position Po which is the position of the wheel 52 at the time when the contact detection signal S1 is output. Are stored in the contact position storage unit 155E. As the contact position Po, there are two contact positions in the tooth height direction and in the tooth thickness direction.

  In step S143D, it is determined whether the phase of the truer 52 is within a predetermined phase range. If it is within the predetermined phase range, the process returns to step S142, and the process is repeated until it is determined that the predetermined phase range is not within the predetermined phase range in step S143D. If it is determined in step S143D that the position is not within the predetermined phase range, then in step S143E, the contact position Po stored last among the contact positions Po stored so far in the contact position storage unit 155E is selected. .

  At this time, the processing steps from step S142 to step S143D are referred to as a fourth contact step S144 (contact step S140). In step S143D, if there is no puller 52 within the predetermined phase range, the process moves to the start position setting step S150. Note that the above process is performed on the two opposing tooth flanks 27a2 and 27a2 (first and second tooth flanks).

  In the start position setting step S150 (start position setting processing unit 155F), theoretical cross-sectional shape data of the tooth surface 27a2 (represented by a pair of a plurality of positions in the height direction and a position in the thickness direction) Based on the contact position Po of one tooth surface 27a2 lastly stored in the position storage unit 155E and the contact position Po of the other tooth surface 27a2, the truing start position when starting the truing by the puller 52 is two opposing It sets up to tooth flank 27a2, 27a2 (the 1st and 2nd tooth flank). When the contact position in the tooth thickness direction of the contact position Po is on the tooth groove side compared to the position in the tooth thickness direction of the theoretical cross-sectional shape data of the tooth surface 27a2, the theoretical sectional shape data of the tooth surface 27a2 is When it is set on the outer diameter side of the screw-like grindstone 27 and on the opposite side to the tooth groove, theoretical shape data of the tooth surface 27 a 2 is set on the inner diameter side of the screw-like grindstone 27.

  Then, in the truing step S160, truing is sequentially performed after relatively moving the screw-like grindstone 27 and the puller 52 to the truing start position with respect to the two opposing tooth surfaces 27a 2 27a 2 (first and second tooth surfaces). . The truing is repeated by changing the position in the tooth height direction. When truing by changing the position in the tooth height direction, theoretical cross-sectional shape data of the tooth surface 27a2 set in the radial direction according to the contact position Po is used. Thereby, the same effect as that of the above embodiment can be obtained.

  According to the above embodiment, in the contact steps S40 and S140, the wheel 52 is brought into contact with both of the two tooth surfaces 27a2 and 27a2 (first and second tooth surfaces) opposed to each other. There is no limit. In the contact steps S40 and S140, the truer 52 is brought into contact with only one tooth surface 27a2 to obtain the shape, and the shape of the other tooth surface 27a2 opposed is based on the shape of the tooth surface 27a2 obtained by the contact. It may be calculated by calculation. At this time, theoretical cross-sectional shape data of the tooth surface 27a2 (represented by a pair of a plurality of positions in the height direction and a position in the thickness direction) is used.

(3. Effects of the embodiment)
In the truing device 50 for a screw-like grindstone according to the above-described embodiment, the control device 54 continuously rotates the screw-like grindstone 27 at a predetermined rotational speed or more, and the screw-like grindstone 27 adjacent to the puller 52 in the direction of the first axis 51a. In a state in which the tooth groove entry processing portion 55C for entering the space in the tooth groove 27c between the tooth streaks 27a and the screw-like grindstone 27 is continuously rotated at a predetermined rotational speed or more, the tooth groove 27c The contact processing unit 55D which makes the contactor 52 moved into the inside relatively move in at least one direction of the first axis 51a and make contact with the tooth surface and causes the AE sensor 53 (contact detection unit) to output the contact detection signal S1; And a contact position storage unit 55E for storing a contact position Po which is a position of the puller 52 at the time when the contact 52 is brought into contact with the tooth surface 27a2 and the contact detection signal S1 is output. Based on the contact position Po stored in the contact position storage unit 55E, the start position setting processing unit 55F for setting the truing start position when starting the truing by the truer 52, and the truing start position for the truing 52 at the time of truing execution. And a truing processing unit 55G that executes truing after being moved to.

  As described above, in the contact processing unit 55D, in a state in which the screw-like grindstone 27 is continuously rotated at a predetermined rotation speed or more, the puller 52 approaches the tooth surface 27a2 and eventually contacts. At this time, by making the rotational speed Vθ of the screw-like grindstone 27 equal to or higher than a predetermined rotational speed, when the wheel 52 contacts the tooth surface 27a2, not the bottom but the bottom of the undulations of the tooth surface 27a2 Can be brought into contact with any position of the slope close to the top of the. Thereafter, the truing processing unit 55G starts the truing from the position (truing start position) of the tooth surface 27a2 with which the truer 52 contacts, thereby reducing the truing amount at the tooth surface 27a2 as compared with the case where the truing is started from the bottom. I can do it. As a result, the life of the threaded grinding wheel 27 is increased. Further, since the truing start position on the tooth surface 27a2 of the screw-like grinding stone 27 is automatically detected by the control of the control device 54, the time required for the truing operation can be shortened.

  Further, according to the above-described embodiment, the contact processing unit 55D moves the puller 52, which has entered the space in the tooth groove 27c, relative to the tooth groove 27c in the direction of the first axis 51a, and forms the tooth surface 27a2. After contacting the first tooth surface, the truer 52 is moved relative to the other in the direction of the first axis 51a, and is brought into contact with the second tooth surface which is the tooth surface opposite to the first tooth surface in the tooth groove 27c. As described above, since the truing start position is obtained for both of the facing tooth flanks 27a2, a higher effect can be expected than in the case where the truing start position is found for only one tooth flank 27a2.

  Further, in the truing device 150 for the screw-like grindstone according to the above-described embodiment, the control device 154 sets the clearance 52 in a space in the tooth groove 27c between the tooth lines 27a of the screw-like grindstone 27 adjacent in the direction of the first axis 51a. The tooth groove entry processing portion 55C for entering and the screw-like grindstone 27 are continuously rotated at a predetermined rotation speed, and the tire 52 entering the space in the tooth groove 27c is a predetermined value exceeding 0 between the tooth surface 27a2 and While making the clearance 52 move in synchronization with the rotation of the tooth surface 27a2 after having the clearance d1, the contactor Q1 of the tooth surface 27a2 contacts with the contact portion Q1 while relatively moving the clearance 52 in the direction of the first axis 51a. The contact detection signal S1 is output by the AE sensor 53 (contact detection unit), and the puller 52 is moved in the direction of the first axis 51a to exceed 0 between the puller 52 and the tooth surface 27a2. A contact processing unit 155D that repeatedly performs a process of setting a fixed gap d1 each time the contact detection signal S1 is output within a predetermined phase range in the direction of the tooth surface 27a2 of the tooth surface 27a2, and a contact processing unit In 155D, the contact position storage unit 155E stores the contact position Po, which is the position of the puller 52 at the time when the contact detection signal S1 is last output, and the contact position Po stored in the contact position storage unit 155E. 52. A start position setting processing unit 155F for setting the truing start position when starting truing by 52, and a truing processing unit 55G for moving the truer 52 to the truing start position and then performing truing at the time of truing execution. Prepare.

  As described above, since the higher contact portion Q is searched for in the tooth surface 27a2 and the last contact position Po detected is set as the truing start position, among the undulations of the tooth surface 27a2, a position close to the vertex is accurately made. It can be detected. As a result, the amount of truing at the tooth surface 27a2 can be further reduced as compared with the case where truing is started from the bottom of the swell. As a result, the life of the screw-like grindstone 27 is further enhanced.

  In addition, the contact processing unit 155D of the control device 154 provided in the truing device 150 according to the above embodiment causes the puller 52 that has entered the space in the tooth groove 27c to at least one of the tooth groove 27c in the first axis 51a direction. The first contact processing unit D1 causes the AE sensor 53 (contact detection unit) to output a contact detection signal S1 by causing the AE sensor 53 (contact detection unit) to move relative to the tooth surface 27a2 and the contactor 52 by the first contact processing unit D1. A second contact processing portion D2 relatively moving the contactor 52 in a direction away from the contacted portion so as to have a predetermined gap d1 exceeding 0 after contacting the contacted portion Q1; The pulley 52 is relatively moved in the direction of the first axis 51 a so as to move in synchronization with the rotation of the tooth surface 27 a 2 in a state where the crane 52 has a predetermined gap d 1 with the contacted portion Q 1. The AE sensor 53 is brought into contact with the tooth-contacted portion Q2 when the tooth-contacted portion Q2 has a tooth thickness greater than the tooth-contacted portion Q1 within a predetermined phase range in the direction of the tooth surface 27a2 of the tooth surface 27a2. In the third contact processing unit D3 that causes the contact detection signal S1 to be output by (contact detection unit) and the third contact processing unit D3, if there is a contact portion Q2 with a tooth thickness, processing in the second contact processing unit D2 And a fourth contact processing unit D4 that repeatedly performs the processing in the third contact processing unit D3 within a predetermined phase range. As described above, since the higher contact portion Q2 is searched after contacting the contact portion Q1, the contact portion Q1 can be obtained at the minimum and is efficient.

  In the above embodiment, the contact detection unit includes an AE sensor, and the AE sensor detects a contact between the puller 52 and the screw-like grindstone 27 and outputs a contact detection signal S1. As a result, the contact between the pulley 52 and the screw-shaped grinding wheel 27 can be detected at low cost and with high accuracy.

  In the truing method of the truing device 50 according to the above-described embodiment, the thread-like grindstone 27 is continuously rotated at a predetermined rotational speed or more, and the teeth 52a of the thread-like grindstone 27 adjacent in the direction of the first axis 51a. The tooth groove approach step S30 for entering into the space in the tooth groove 27c between them, and the toothed wheel 27c is made to enter the tooth groove 27c in a state where the screw-like grindstone 27 is continuously rotated at a predetermined rotational speed or more. At the time when the contact detection signal S1 is output by causing the AE sensor 53 (contact detection unit) to output the touch detection signal S1, the contactor 52 is relatively moved in at least one direction of the first axis 51a to be in contact with the tooth surface 27a2. A contact step S40 for storing in the contact position storage unit 55E the contact position Po which is the position of the tsurua, and the contact position storage unit 55E A starting position setting step S50 for setting the truing start position when the truing is started by the truer based on the touch position Po, and a truing for performing the truing after moving the truer 52 to the truing start position at the time of executing the truing And step S60. Thus, truing can be performed that has the same effect as the effect obtained by truing by the truing device 50.

  Further, in the truing method of the truing device 150 according to the above-described embodiment, the tooth groove advancing step of causing the trulier 52 to enter the space in the tooth groove 27c between the tooth streaks 27a of the screw shaped grindstone 27 adjacent in the first axis 51a direction. S30, while continuously rotating the screw-like grindstone 27 at a predetermined rotation speed, and having a predetermined clearance d1 exceeding 0 between the tooth surface 27a2 and the puller 52 which has entered the space in the tooth groove 27c Then, while relatively moving the puller 52 in the direction of the first axis 51a so that the tsurua moves in synchronization with the rotation of the tooth surface 27a2, the AE sensor 53 (contact detection unit) is brought into contact with the contact portion Q1 of the tooth surface 27a2. To output the contact detection signal S1 and move the puller 52 in the direction of the first axis 51a, thereby providing a predetermined gap d1 exceeding 0 between the puller 52 and the tooth surface 27a2. The processing described above is repeatedly performed each time the touch detection signal S1 is output within a predetermined phase range in the direction of the tooth surface 27a of the tooth surface 27a2, and the position of the wheel 52 at the time when the touch detection signal S1 is last output. Start of setting the truing start position when the truer 52 starts the truing based on the contact step S40 of storing the contact position Po which is in the contact position storage unit 155E and the contact position Po stored in the contact position storage unit 155E A position setting step S150, and a truing step S160 for moving the truer 52 to the truing start position and then performing truing at the time of truing execution are provided. Thus, truing can be performed with the same effect as the effect obtained by truing by the truing device 150.

  In the present embodiment, although the AE sensor 53 is used as the contact detection means, the present invention is not limited to this. For example, changes in rotational torque, rotational speed, etc. of the wheel 52 and the screw-like grindstone 27 The contact with the tooth surface 27a2 of the truer 52 may be detected by detecting the “”, and the same operation and effect as described above can also be achieved by this.

  10, 110; gear grinding machine, 27: thread-like grindstone, 27a; tooth line, 27a1; outer peripheral surface, 27a2; tooth surface (first tooth surface, second tooth surface), 27a3; tooth bottom, 27c; tooth groove, 50, 150; truing device, 51; first rotating shaft (spindle 26), 51a; first axis, 52; tsurua, 53; AE sensor (contact detection unit), 54, 154; control device, 55A; Processing unit, 55B; Tooth groove position detection processing unit, 55C; Tooth groove entry processing unit, 55D, 155D; Contact processing unit, 55E, 155E; Contact position storage unit, 55F, 155F; Start position setting processing unit, 55G; Truing Processing unit, 56, 156; storage device, 522: second rotation axis, 522a; second axis, d1: clearance, P1; truing start position, Po: contact position.

Claims (7)

A first rotation shaft rotatably supporting a screw-like grindstone provided with helical teeth formed with a predetermined twist angle on the outer periphery of the cylinder, around a first axis;
A truing is carried out with respect to the outer peripheral surface or the tooth surface of the tooth line of the screw-like grindstone which is rotatably supported around the second axis, moves relative to the second axis and the direction orthogonal to the second axis, and rotates. Tsurua to do
A contact detection unit that outputs a contact detection signal when the tsurua moves to approach the teeth and contact the outer circumferential surface or the tooth surface;
A control device for moving at least one of the tsurua and the threaded grinding wheel to a desired position and controlling rotation to perform the truing;
A threaded grinding wheel truing device comprising:
The controller is
Tooth groove entry processing for continuously rotating the screw-shaped grinding wheel at a predetermined rotational speed or more and causing the torus to enter the space in the tooth space between the teeth of the screw-shaped grinding wheel adjacent in the first axial direction Department,
In a state in which the screw-like grindstone is continuously rotated at the predetermined rotation speed or more, the teeth which have been moved into the tooth groove with respect to the tooth groove are relatively moved in at least one of the first axial direction to move the tooth A touch processing unit that causes a surface to be in contact and causes the contact detection unit to output the contact detection signal;
A touch position storage unit that stores a touch position, which is a position of the tsurua at the time when the tsurua contacts the tooth surface and the touch detection signal is output;
A start position setting processing unit that sets a truing start position when the truing starts the truing based on the contact position stored in the contact position storage unit;
A truing processing unit that moves the tsurua to the truing start position and then executes the truing during the truing execution;
A truing device for a threaded grinding wheel, comprising: The contact processing unit is
After making the said torua which was made to enter into the space in the tooth space move relative to the tooth space in one of the first axial direction and make contact with the first tooth surface which is the tooth surface,
The screw shape according to claim 1, wherein the tsurua is relatively moved in the other of the first axial direction, and is brought into contact with the second tooth surface which is the tooth surface opposite to the first tooth surface in the tooth space. Wheel truing device. A first rotation shaft rotatably supporting a screw-like grindstone provided with helical teeth formed with a predetermined twist angle on the outer periphery of the cylinder, around a first axis;
A truing is carried out with respect to the outer peripheral surface or the tooth surface of the tooth line of the screw-like grindstone which is rotatably supported around the second axis, moves relative to the second axis and the direction orthogonal to the second axis, and rotates. Tsurua to do
A contact detection unit that outputs a contact detection signal when the tsurua moves to approach the teeth and contact the outer circumferential surface or the tooth surface;
A control device for moving at least one of the tsurua and the threaded grinding wheel to a desired position and controlling rotation to perform the truing;
A threaded grinding wheel truing device comprising:
The controller is
A tooth groove entry processing unit for entering the space in the tooth space between the teeth of the threaded grinding wheel adjacent to each other in the first axial direction;
While continuously rotating the screw-like grindstone at a predetermined rotational speed, and making the turl-a which has entered the space in the tooth groove have a predetermined gap of more than 0 with the tooth surface, The contact detection unit outputs the contact detection signal by making contact with the contact portion of the tooth surface while relatively moving the tsurua in the first axial direction so that the tsurua moves in synchronization with the rotation of the tooth surface. A process of moving the tsurua in the first axial direction so as to have the predetermined gap exceeding 0 between the tsurua and the tooth surface in a predetermined direction in the tooth line direction of the tooth surface A touch processing unit that repeatedly performs each time the touch detection signal is output within a phase range;
A contact position storage unit that stores, in the contact processing unit, a contact position which is a position of the tsurua at the time when the contact detection signal is finally output;
A start position setting processing unit that sets a truing start position when the truing starts the truing based on the contact position stored in the contact position storage unit;
A truing processing unit that moves the tsurua to the truing start position and then executes the truing during the truing execution;
A truing device for a threaded grinding wheel, comprising: The contact processing unit is
The torua which has entered the space in the tooth space is moved relative to the tooth space in at least one of the first axial direction to contact with the contact portion of the tooth surface and the contact detecting portion makes the contact A first contact processor for outputting a detection signal;
A direction in which the torus is separated from the to-be-contacted portion so as to have the predetermined gap exceeding 0 with the to-be-contacted portion after the torus comes into contact with the to-be-contacted portion by the first contact processing portion A second contact processor to move relative to the
The tsurua is relatively moved in the first axial direction so as to move in synchronization with the rotation of the tooth surface in a state where the tsurua has the predetermined gap between the contact part and the contact part, the tooth surface When there is a to-be-contacted portion having a tooth thickness greater than the to-be-contacted portion within the predetermined phase range in the direction of the tooth streak, the to-be-contacted portion of the tooth thickness is brought into contact and the contact detection signal A third contact processing unit for outputting
In the third contact processing unit, when there is a contact portion with the tooth thickness, the processing in the second contact processing unit and the processing in the third contact processing unit are repeated within the predetermined phase range. The fourth contact processing unit to be implemented;
The truing device for a screw-like grindstone according to claim 3, comprising:   The screw according to any one of claims 1 to 4, wherein the contact detection unit includes an AE sensor, and the AE sensor detects a contact between the tsurua and the screw-like grindstone and outputs the contact detection signal. Truing device for grinding stone. A truing method of a thread-like grinding wheel using the truing device according to claim 1, wherein
A tooth groove for continuously rotating the screw-like grindstone at a predetermined rotational speed or more, and entering the space in the tooth space between the teeth of the screw-like grindstone adjacent in the first axial direction to the tulle An entry process,
In a state in which the screw-like grindstone is continuously rotated at the predetermined rotation speed or more, the teeth which have been moved into the tooth groove with respect to the tooth groove are relatively moved in at least one of the first axial direction to move the tooth Contacting the surface, causing the contact detection unit to output the contact detection signal, and storing the contact position, which is the position of the tsurua at the time when the contact detection signal is output, in the contact position storage unit;
A start position setting step of setting the truing start position when the truing starts the truing based on the contact position stored in the contact position storage unit;
A truing step of performing the truing after moving the truer to the truing start position at the time of the truing execution;
A method of truing a threaded grinding wheel, comprising: A truing method of a screw-like grinding stone using a truing device according to claim 3, which is:
A tooth-groove entering step of causing the tsurua to enter a space in the tooth groove between the teeth of the threaded grinding wheel adjacent in the first axial direction;
The screw-shaped grinding wheel is continuously rotated at the predetermined rotational speed, and the clearance which has entered the space in the tooth groove is set to have the predetermined gap exceeding 0 with the tooth surface. And the contact detection unit makes contact with the contact portion of the tooth surface while relatively moving the tsurua in the first axial direction so that the tsurua moves in synchronization with the rotation of the tooth surface, the contact detection signal by the contact detection unit Is output, and the processing is performed in the direction of the tooth line of the tooth surface so as to move the tsurua in the first axial direction so as to have the predetermined gap exceeding 0 between the tsurua and the tooth surface. Within the predetermined phase range, the process is repeated each time the touch detection signal is output, and the touch position which is the position of the tsurua at the time when the touch detection signal is output last is the touch position A contacting step of storing in the storage unit,
A start position setting step of setting the truing start position when the truing starts the truing based on the contact position stored in the contact position storage unit;
A truing step of performing the truing after moving the truer to the truing start position at the time of the truing execution;
A method of truing a threaded grinding wheel, comprising:

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