JP2010029950A - Gear grinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gear grinder capable of improving maintainability and miniaturization. <P>SOLUTION: The gear grinder grinds a workpiece W by rotating a threaded grindstone 17 and the workpiece W while they are engaged with each other. A disk dresser 66 which rotates to drive for dressing the grindstone 17 is turned around a C2 axis parallel to a C1 axis serving as a workpiece rotation axis of the workpiece W and orthogonal to a feeding direction of the grindstone 17 to the workpiece W between a dressing position P2 where the threaded grindstone 17 can be dressed and a retreat position P1 where it retreats from the dressing position P2 during the grinding. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gear grinder that grinds a workpiece gear with a grindstone, and more particularly to a gear grinder having a dressing function for dressing a grindstone.

  2. Description of the Related Art Conventionally, a gear grinder has been provided as one that grinds a workpiece, which is a gear to be processed after heat treatment, using a grindstone, which is a grinding tool, and efficiently finishes the tooth surface of the workpiece. In such a gear grinding machine, the grinding wheel wears and the sharpness decreases when grinding is performed, so after grinding a predetermined number of workpieces, dressing is applied to the worn grinding stone and a sharp blade surface is obtained. It is necessary to make it play.

  Thereby, the conventional gear grinding machine is provided with a dressing function for dressing a worn grindstone with a dresser. Such a gear grinding machine having a dressing function is disclosed in Patent Document 1, for example.

JP-A-2005-111600

  In the conventional gear grinding machine described above, a swiveling ring is supported on the outer periphery of a counter column that is erected opposite to the grindstone, and a pair of grippers capable of gripping a workpiece are provided on the swiveling ring. A dresser disposed between the pair of grippers is provided. And, by turning the gripper against the rotary table that can hold the workpiece, the workpiece can be carried in and out, while dressing is possible by turning the dresser against the grindstone. It is said.

  However, in such a conventional configuration, since both the gripper and the dresser are provided on the swivel ring, when either grinding or dressing is being processed, the other maintenance cannot be performed. . Further, since the dresser is usually provided with dresser driving means for rotating the dresser, the dresser often becomes a heavy object. In order to support such a heavy dresser, the swivel ring must also be enlarged. Furthermore, if the swivel ring is enlarged, a large driving force for swiveling the swivel ring is required, and the swivel ring driving means for swiveling the swivel ring also becomes large. As a result, the gear grinding machine may be increased in size.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide a gear grinding machine capable of improving maintainability and reducing the size.

A gear grinding machine according to the first invention for solving the above-mentioned problems is as follows.
A gear grinder that rotates in a state where the grindstone and the gear to be processed are meshed and performs grinding on the gear to be processed,
A dresser that performs rotational driving to dress the grindstone;
The dresser is fed between the dressing position where the grindstone can be dressed and the retracted position retracted from the dressing position during grinding, and is parallel to the workpiece rotation axis of the gear to be processed and the grindstone is fed to the gear to be processed. Dresser turning means for turning around a turning axis perpendicular to the direction is provided.

A gear grinding machine according to a second invention for solving the above-mentioned problems is as follows.
In the gear grinding machine according to the first invention,
The dresser turning means includes:
A rotary unit that rotatably supports the dresser and rotates about the pivot axis;
A fixed portion that rotatably supports the rotating portion;
Positioning means for positioning the rotation of the rotating part with respect to the fixed part;
A positioning release means provided in the fixing portion and releasing the positioning by the positioning means by the action of a lever;
And rotating means for allowing the rotating part to rotate when the positioning release means is actuated.

A gear grinding machine according to a third invention for solving the above-described problems is as follows.
In the gear grinding machine according to the second invention,
The positioning release means includes
A cylinder portion formed in the fixed portion;
A piston member slidably accommodated in the direction of the pivot axis in the cylinder part;
An annular groove formed in the rotating part;
A lever lever whose base end is swingably supported by the fixed portion and whose tip is held by the piston member;
A roller that fits in the groove and is rotatably supported by the lever lever;
Pressure supply / exhaust means for supplying and discharging pressure to the cylinder portion and enabling the piston member to slide.

A gear grinding machine according to a fourth invention for solving the above-mentioned problems is as follows.
In the gear grinding machine according to the third invention,
In the through hole formed in the lever lever, the groove is disposed,
The roller is rotatably supported on the inner peripheral surface of the through hole.

A gear grinding machine according to a fifth invention for solving the above-mentioned problems is as follows.
In the gear grinding machine according to the third invention,
A holding pin is supported between the tip portions of the lever lever formed in a bifurcated shape,
A holding groove for holding the holding pin is formed in the piston member.

  Therefore, according to the gear grinding machine of the present invention, the gear to be machined between the dressing position where the grindstone can be dressed by rotating the grindstone between the dress position where the grindstone can be dressed and the retracted position where the dressing position is retracted during grinding. The maintenance performance can be improved and the size of the workpiece can be reduced by turning around a turning axis that is parallel to the workpiece rotation axis and orthogonal to the feed direction of the grindstone to the workpiece gear.

  Hereinafter, a gear grinding machine according to the present invention will be described in detail with reference to the drawings. 1 is a perspective view of a gear grinding machine according to an embodiment of the present invention, FIG. 2 is a perspective view of a dresser turning device, FIG. 3 is a plan view of the dresser turning device, and FIG. 4 is a cross-sectional view taken along line AA in FIG. FIG. 5 and FIG. 5 are sectional views taken along the line BB in FIG.

  As shown in FIG. 1, a column 12 is supported on a bed 11 of a gear grinding machine 1 so as to be movable in the horizontal X-axis direction (feed direction). A saddle 13 is supported on the column 12 so as to be able to move up and down in the vertical Z-axis direction, and a swing head 14 is supported on the saddle 13 so as to be rotatable around a horizontal A axis. A slide head 15 is supported on the revolving head 14 so as to be movable in the horizontal Y-axis direction. The slide head 15 is provided with a grindstone head 16. A barrel-shaped threaded grindstone 17 is detachably attached to the grindstone head 16 and is supported so as to be rotatable around a vertical B axis. The threaded grindstone 17 is built in the grindstone head 16. It is driven to rotate by a grindstone drive motor (not shown).

  In addition, on the front surface of the column 12 on the bed 11, a rotary table 18 is provided to be rotatable around a vertical C1 axis (workpiece rotation axis). A cylindrical attachment jig 19 is attached to the upper surface of the rotary table 18, and a work (workpiece gear) W that is an internal gear material can be attached to and detached from the upper inner peripheral surface of the attachment jig 19. It is attached. A dresser slewing device (dresser slewing means) 20 is provided on the side of the rotary table 18. The dresser slewing device 20, which will be described in detail later, is a disk dresser 66 for dressing the threaded grindstone 17. Is supported so as to be pivotable about the C2 axis (swivel axis).

  As shown in FIGS. 1 and 2, the dresser turning device 20 includes a base portion 31 and a turning portion 32 provided on the upper portion of the base portion 31. The base portion 31 is provided on the bed 11, and the turning portion 32 is supported at the center of the upper surface of the base portion 31 so as to be turnable about the C2 axis.

  As shown in FIGS. 3 to 5, the base portion 31 includes a fixed portion 41 and a rotating portion 42. The fixed portion 41 is fixed on the bed 11, and the rotating portion 42 is rotatably supported at the central portion of the fixed portion 41.

  The rotating part 42 is arranged coaxially with the C2 axis, and has a circular rotating plate 42a and an axial shaft part 42b. A gear coupling (positioning means) 43 is interposed between the rotating plate 42a and the fixed portion 41 of the rotating portion 42, and an upper gear portion 43a of the gear coupling 43 is provided on the lower surface of the rotating plate 42a. On the other hand, a lower gear portion 43 b of the gear coupling 43 is provided on the upper surface of the fixed portion 41. Further, a key 44 is provided at an axially intermediate portion of the shaft portion 42b, and a cylindrical flange member 45 is fitted at the lower end of the shaft portion 42b. The lower end of the shaft portion 42b, the outer peripheral surface of the flange member 45, and the flange portion 45a form an annular groove 46 that is recessed from the outer peripheral surface of the shaft portion 42b.

  A horizontal turning drive motor (rotating means) 47 is provided at the side of the fixed portion 41, and a drive gear 48, an intermediate gear 49, and a driven gear are provided at the intermediate portion in the height direction in the fixed portion 41. 50 is rotatably supported. The drive gear 48 and the intermediate gear 49 are engaged with each other, the intermediate gear 49 and the driven gear 50 are engaged with each other, the drive gear 48 is fitted to the output shaft of the horizontal turning drive motor 47, and the driven gear 50 is a rotating part. 42 is disposed outside the shaft portion 42b. A key groove 50a is formed on the inner peripheral surface of the driven gear 50, and the key 44 of the shaft portion 42b is supported in the key groove 50a so as to be slidable in the C2 axis direction.

  A lever 51 is housed in the lower portion of the fixed portion 41. The lever 51 has a base end portion 51a having a narrow width and a bifurcated tip end portion 51b. The base end portion 51a is swingably supported in the fixed portion 41 via a swing pin 52. On the other hand, the front end 51b supports the holding pin 53 therebetween. Further, the lever 51 is formed with a through hole 51c, and the flange member 45 of the shaft portion 42b is passed through the through hole 51c. A roller 54 is rotatably supported on the inner peripheral surface of the through hole 51 c, and the roller 54 is fitted in the groove 46.

  Further, a cylinder portion 55 is formed between the front end portions 51b of the lever lever 51, and a piston member 56 is accommodated in the cylinder portion 55 so as to be slidable in the C2 axis direction. A holding groove 56a that is concave in the width direction is formed on the side wall of the piston member 56 on the lever lever 51 side, and the holding pin 53 of the tip 51b is held in the holding groove 56a. Further, hydraulic passages 57 a and 57 b communicate with the upper and lower portions of the cylinder portion 55, and the hydraulic passages 57 a and 57 b are connected to a hydraulic supply / discharge device (pressure supply / discharge means) 58. That is, the hydraulic pressure supply / discharge device 58 supplies and discharges hydraulic pressure into the cylinder portion 55 via the hydraulic passages 57a and 57b.

  The groove portion 46, the lever lever 51, the roller 54, the cylinder portion 55, the piston member 56, the hydraulic supply / discharge device 58, and the like constitute positioning release means.

  On the other hand, as shown in FIGS. 2 and 3, the turning portion 32 includes a main body portion 61 and a motor storage portion 62. The base portion of the main body 61 is fixed on the rotating plate 42 a of the base portion 31, and the motor storage portion 62 is formed in a cylindrical shape and provided at the front end of the main body portion 61.

  A vertical turning drive motor 63 is built in the motor housing 62. The output shaft of the vertical turning drive motor 63 is driven to rotate about the horizontal B2 axis, and is connected to the rotating plate 64 and the outside of the motor housing portion 62. The rotary plate 64 is provided with a dresser rotation driving motor 65. The output shaft of the dresser rotation driving motor 65 is driven to rotate about the C3 axis, and a disc-shaped disk dresser 66 is detachably mounted.

  That is, by supplying hydraulic pressure from the hydraulic supply / discharge device 58 to the lower portion of the cylinder portion 55 through the hydraulic passage 57b, the piston member 56 slides upward. As a result, the tip 51b of the lever 51 swings upward together with the piston member 56 around the swing pin 52, and the roller 54 presses the upper surface of the groove 46 along with this. As a result, the rotating portion 42 is lifted upward (position indicated by a two-dot chain line in FIG. 4) with respect to the fixed portion 41, and the gear coupling 43 is engaged between the fixed portion 41 and the rotating portion 42. Canceled. That is, the positioning of the rotating part 42 with respect to the fixed part 41 is released.

  On the other hand, the piston member 56 slides downward by supplying hydraulic pressure from the hydraulic supply / discharge device 58 to the upper portion of the cylinder portion 55 through the hydraulic passage 57a in a state where the rotating portion 42 is lifted in this way. To do. As a result, the tip 51b of the lever 51 swings downward together with the piston member 56 around the swing pin 52, and the roller 54 presses the lower surface of the groove 46 along with this. As a result, the rotating part 42 is lowered to the lowest position in the fixing part 41 (position indicated by the solid line in FIG. 4), and the gear coupling 43 between the fixing part 41 and the rotating part 42 is engaged. . That is, the rotating part 42 is positioned with respect to the fixed part 41.

  Further, by driving the horizontal turning drive motor 47 in a state where the rotating portion 42 is lifted, the driving force is transmitted in order to the drive gear 48, the intermediate gear 49, and the driven gear 50, and the rotating portion 42 is connected to the C2 axis. Rotate around. At this time, since the groove portion 46 slides smoothly by the rotation of the roller 54, the lifted rotating portion 42 rotates smoothly. As a result, the disk dresser 66 of the swivel unit 32 turns around the C2 axis, and the disk dresser 66 turns between a retracted position P1 and a dress position P2 (described later). 3).

  Then, by driving the vertical turning drive motor 63 in a state where the disk dresser 66 is positioned at the gear coupling 43 at the dress position P2, the disk dresser 66 is turned around the B2 axis and at the same time is used for driving the dresser rotation. By driving the motor 65, the disk dresser 66 is rotationally driven around the C3 axis. Thus, the threaded grindstone 17 facing the disk dresser 66 is dressed.

  Therefore, when grinding the workpiece W using the gear grinding machine 1, first, the workpiece W is mounted on the mounting jig 19. Next, the column 12, the saddle 13, the turning head 14, and the slide head 15 are driven to move the threaded grindstone 17 in the X, Y, and Z axis directions, and around the A axis according to the torsion angle of the workpiece W. Turn and place inside the workpiece W. Then, the grindstone head 16 is driven to rotate the screw-shaped grindstone 17 about the B axis, and the rotary table 18 is driven to rotate the workpiece W about the C1 axis. 12 is driven to move the threaded grindstone 17 in the X-axis direction (left side direction in FIG. 1) to engage with the workpiece W. Next, the column 12 and the saddle 13 are further driven to swing the threaded grindstone 17 in the Z-axis direction while moving in the X-axis direction. As a result, the threaded grindstone 17 is cut into the workpiece W, and the tooth surface of the workpiece W is ground by the blade surface of the threaded grindstone 17.

  Here, when a predetermined number of workpieces W are ground using the threaded grindstone 17, the blade surface is worn and the sharpness is lowered. Therefore, the disk dresser 66 is periodically rotated to dress the threaded grindstone 17. Do.

  Therefore, when dressing the threaded grindstone 17 by the disk dresser 66, first, hydraulic pressure is supplied from the hydraulic supply / discharge device 58 to the lower portion of the cylinder portion 55 via the hydraulic passage 57b, and the piston member 56 is slid upward. Let Thereby, in the base portion 31, the lever portion 51 lifts the rotating portion 42 with respect to the fixed portion 41, and the gear coupling 43 is disengaged (position indicated by a two-dot chain line in FIG. 4). . That is, the turning part 32 is lifted upward, and the positioning of the disk dresser 66 at the retracted position P1 is released. Next, the horizontal turning drive motor 47 is driven to rotate the rotating portion 42 of the base portion 31, thereby turning the turning portion 32 at a predetermined angle. As a result, as shown in FIGS. 2 and 3, the disk dresser 66 is turned from the retracted position P1 to the dress position P2. In this embodiment, the disk dresser 66 is turned 90 °.

  Then, hydraulic pressure is supplied from the hydraulic supply / discharge device 58 to the upper portion of the cylinder portion 55 via the hydraulic passage 57a, and the piston member 56 is slid downward. Thereby, in the base part 31, the lever part 51 of the lever 51 lowers the rotating part 42 to the lowest position in the fixed part 41, and the gear coupling 43 is engaged (position shown by the solid line in FIG. 4). That is, the turning portion 32 is pushed downward, and the disk dresser 66 at the dress position P2 is positioned. Next, the vertical turning drive motor 63 is driven to turn the disc dresser 66 around the B2 axis in accordance with the twist angle of the threaded grinding wheel 17.

  On the other hand, the column 12, the saddle 13 and the slide head 15 are driven to move the threaded grindstone 17 in the X, Y and Z axis directions so as to face the disk dresser 66 disposed at the dress position P2. During the movement of the threaded grindstone 17 described above, the threaded grindstone 17 is swiveled by the drive of the swivel head 14 so that its axis is arranged in the vertical direction (turning angle 0 °).

  Then, the dresser rotation driving motor 65 is driven to rotate the disk dresser 66 around the C3 axis, and in this state, the slide head 15 is driven to move the threaded grindstone 17 in the Y-axis direction. Then, it meshes with the disk dresser 66 arranged at the dress position P2. Next, the saddle 13 and the slide head 15 are further driven to swing the threaded grindstone 17 in the Z-axis direction while moving in the Y-axis direction. As a result, the threaded grinding wheel 17 is cut into the disk dresser 66, and the blade surface of the threaded grinding wheel 17 is dressed by the blade surface of the disk dresser 66. This dressing operation is performed for the number of blade grooves of the threaded grindstone 17.

  As described above, when the dressing operation is completed, the disk dresser 66 is turned from the dressing position P2 to the retracted position P1 to be in a standby state, and a predetermined number of workpieces W are ground by the dressed screw-shaped grindstone 17. Such a series of operations is repeated.

  In this embodiment, the gear grinding machine according to the present invention is applied to an internal gear grinding machine that grinds a workpiece made of an internal gear material, but is applied to an external gear grinding machine that grinds a work made of an external gear material. It doesn't matter.

  Therefore, according to the gear grinding machine of the present invention, the disk dresser 66 is disposed between the retracted position P1 and the dressing position P2 in parallel to the C1 axis that is the rotation axis of the workpiece W and By turning around the C2 axis orthogonal to the feed direction to the workpiece W (X-axis direction), the dresser turning device 20 is more than the column 12 supporting the threaded grindstone 17 and the rotary table 18 to which the workpiece W is attached. It can arrange | position to the width direction (Y-axis direction) outer side. As a result, the disk dresser 66 arranged at the retracted position P1 does not interfere with the grinding process or the work replacement work, and the disk dresser 66 can be easily approached from the outside of the machine. The maintainability can be improved. In addition, since the disk dresser 66 is configured to be swiveled, the disk dresser 66 can be moved back and forth with respect to the threaded grindstone 17 in a space-saving manner, so that the gear grinding machine 1 can be reduced in size.

  Further, by positioning the disk dresser 66 by the gear coupling 43 at the retracted position P1 and the dress position P2, the disk dresser 66 at the retracted position P1 and the dress position P2 can be always arranged at the same position, and is high. It can be supported with rigidity. Thereby, the reproducibility of the disk dresser 66 arranged at the dress position P2 is improved, so that not only the dressing accuracy is improved, but also a certain quality can be maintained.

  Further, by utilizing the lever action of the lever lever 51, the gear coupling 43 is engaged and released, that is, the rotating portion 42 is moved up and down with respect to the fixed portion 41. Positioning release operation can be performed. Thereby, the cylinder part 55, the piston member 56 accommodated in this, and the hydraulic supply / discharge device 58 can be made small. As a result, since the height of the fixing portion 41 can be suppressed, the dresser turning device 20 can be downsized.

  The present invention can be applied to a gear grinding machine that speeds up the dressing operation during non-grinding.

It is a perspective view of the gear grinding machine which concerns on one Example of this invention. It is a perspective view of a dresser turning device. It is a top view of a dresser turning apparatus. It is AA arrow sectional drawing of FIG. It is a BB arrow sectional view of Drawing 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gear grinding machine 11 Bed 12 Column 13 Saddle 14 Turning head 15 Slide head 16 Grinding wheel head 17 Threaded grinding wheel 18 Rotating table 19 Mounting jig 20 Dresser turning device 31 Base part 32 Turning part 41 Fixing part 42 Rotating part 43 Gear coupling 46 Groove portion 47 Horizontal turning drive motor 51 Lever lever 52 Swing pin 53 Holding pin 54 Roller 55 Cylinder portion 56 Piston member 57 Hydraulic passage 58 Hydraulic supply / discharge device 63 Vertical turning drive motor 65 Dresser rotation drive motor 66 Disc dresser W Work P1 Retraction position P2 Dress position

Claims (5)

A gear grinder that rotates in a state where the grindstone and the gear to be processed are meshed and performs grinding on the gear to be processed,
A dresser that performs rotational driving to dress the grindstone;
The dresser is fed between the dressing position where the grindstone can be dressed and the retracted position retracted from the dressing position during grinding, and is parallel to the workpiece rotation axis of the gear to be processed and the grindstone is fed to the gear to be processed. A gear grinding machine comprising dresser turning means for turning about a turning axis orthogonal to the direction. In the gear grinding machine according to claim 1,
The dresser turning means includes:
A rotary unit that rotatably supports the dresser and rotates about the pivot axis;
A fixed portion that rotatably supports the rotating portion;
Positioning means for positioning the rotation of the rotating part with respect to the fixed part;
A positioning release means provided in the fixing portion and releasing the positioning by the positioning means by the action of a lever;
A gear grinding machine, comprising: a rotating unit that allows the rotating unit to rotate when the positioning release unit is actuated. The gear grinding machine according to claim 2,
The positioning release means includes
A cylinder portion formed in the fixed portion;
A piston member slidably accommodated in the direction of the pivot axis in the cylinder part;
An annular groove formed in the rotating part;
A lever lever whose base end is swingably supported by the fixed portion and whose tip is held by the piston member;
A roller that fits in the groove and is rotatably supported by the lever lever;
A gear grinding machine comprising pressure supply / discharge means for supplying and discharging pressure to and from the cylinder portion so that the piston member can slide. In the gear grinding machine according to claim 3,
In the through hole formed in the lever lever, the groove is disposed,
The gear grinding machine, wherein the roller is rotatably supported on the inner peripheral surface of the through hole. In the gear grinding machine according to claim 3,
A holding pin is supported between the tip portions of the lever lever formed in a bifurcated shape,
A gear grinding machine, wherein a holding groove for holding the holding pin is formed in the piston member.

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