JPH06344223A - Gear grinding device - Google Patents

Abstract

PURPOSE:To provide a gear grinding device which can automatically carry in/out a work, position the work in the rotational direction, and execute the grinding. CONSTITUTION:An arbor 4 to lock and hold a work 5 where a number of teeth are formed on the outer circumference, a work table 1 where a rotating part 2 having a chuck to hold this arbor 4 in an attachable/detachable manner is provided, and a grinding wheel driving part to drive a grinding wheel to grind the teeth of the work 5 are provided. A work carrying robot 31 which is provided with a positioning part 34 to be engaged with an engaging part 6 mounted on the outer circumference of the arbor 4 and carries in/out the arbor 4 together with the work 5 onto the shaft center of the rotating part 2 with the prescribed action pattern, an engaged body driving part 15 where a locking body 19 engaged with the tooth adjacent to the work 5 carried into the rotating part 2 together with the arbor 4 is driven in an advancing/receding manner in the radial direction of the work 5, and a moving means 16 to move this locking body driving part 15 in the radial direction of the work 5 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear grinding device for grinding teeth formed on the outer periphery of a work such as gears and splines.

[0002]

2. Description of the Related Art Conventionally, in the process of rotating a work having a large number of teeth formed on its outer circumference, a gear formed by grinding the teeth of the work by bringing a groove formed on the outer circumference of a rotating grindstone into contact with the teeth of the work. There is a grinding device. Here, for example, when grinding a gear, the gear is carried into the rotary shaft of the gear grinding device, and the clutch between the rotary shaft and the motor is disengaged.
While rotating the grindstone by hand, contact the gear, and by rotating the gear following the rotational movement of this grindstone, adjust the position of the teeth of the gear with respect to the grindstone, and then rotate the gear and the grindstone by power. We are doing grinding work.

[0003]

As described above, every time one work is ground, the position of the work must be manually adjusted with respect to the grindstone, and the work is attached and detached manually. Since it has to be performed, when a large number of workpieces of the same size are ground, the production amount per unit time becomes extremely low. In addition, workers must be attached during that time, which causes a problem of increasing labor costs.

[0004]

The invention according to claim 1 is
An arbor for holding the center of a workpiece with a large number of teeth formed on its outer periphery and holding it, a work table provided with a rotary drive unit having a chuck for detachably holding this arbor, and an outer periphery of the workpiece. The arbor together with the workpiece has a grindstone driving unit that drives a grindstone in which grooves corresponding to the teeth are formed, and a positioning unit that engages with an engaging portion provided on the outer periphery of the arbor, with a predetermined action pattern. A work transfer robot that carries in and out on the axis of the rotation drive unit, and a locking body that engages between the adjacent teeth of the work carried in the rotation drive unit together with the arbor and has a radius of the work. It is configured by a locking body driving section that is driven to move back and forth in the direction, and a moving means that moves the locking body driving section in the radial direction of the work.

According to a second aspect of the invention, in the first aspect of the invention, the locking body is connected to the locking body drive portion via a compression spring.

According to a third aspect of the present invention, in the first or second aspect of the invention, a protrusion is formed on the outer periphery of the arbor, and the protrusion of the arbor is rotated by inertia immediately after the rotation drive unit is stopped. A stopper protruding into the locus is provided so that it can move back and forth.

According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, the rotating means is provided for rotatably supporting the moving means with an axis parallel to the axis of the rotary drive section. .

[0008]

According to the first aspect of the present invention, the relative positional relationship between the arbor and the work transfer robot becomes constant due to the engagement between the engagement part of the arbor and the positioning part of the work transfer robot.
Moreover, since the action pattern of the work transfer robot is constant, the arbor and the work can be carried into a substantially fixed position on the axis of the rotation drive unit, and the work transfer robot is moved from the axis of the rotation drive unit to the outside. After retracting to one side, the locking body drive unit is driven to engage the locking body between the teeth of the work, so that the arbor is chucked in the rotation drive unit while the position in the rotation direction of the work is set. Can be held at. Accordingly, even when the locking body is retracted to the outside of the work by the locking body drive unit, the rotational position of the arbor and the work can be stabilized by the resistance of the rotation drive unit in the rotation direction. By rotating the rotary drive unit and the grindstone drive unit synchronously to bring the grindstone into contact with the work, the grinding work can be performed without manually adjusting the position of the work. Further, by moving the locking body drive portion itself in the radial direction of the work by the moving means,
Work pieces having different outer diameters can be positioned by the locking body.

According to a second aspect of the present invention, when the center of the locking body is slightly deviated from the center between the adjacent teeth of the work, the resistance given to the locking body drive portion by the elasticity of the compression spring. It is possible to smoothly adjust the positions of the teeth of the work to the center of the locking body.

According to the third aspect of the present invention, after grinding, the work rotates at low speed due to inertia even if the rotary drive unit is stopped. However, during this time, the stopper is advanced toward the center of the arbor to project the stopper. Since the arbor is in contact with the work part, the engaging part can be stopped in a state of being aligned with the positioning part of the work robot, as in the case where the arbor is loaded onto the work table by the work transfer robot. The completed work and arbor can be easily carried out by the work transfer robot.

According to a fourth aspect of the present invention, the direction of the locking body drive portion can be adjusted by the rotating means.
Even if there is a manufacturing error in the device, the locking body can always be advanced toward the axis of the work, thus avoiding a state in which a rotational force acts on the work before the arbor is held by the chuck. This makes it possible to align the workpiece in the rotational direction more accurately.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view, and in the figure, 1 is a work table. The work table 1 has a center shaft (not shown) and a collet chuck (not shown) as a chuck therein, and is driven by a motor (not shown). A center shaft 3 located above the rotary drive unit 2 is provided. Reference numeral 4 is an arbor that holds the gear 5 as a work in a non-rotatable manner and holds it in a detachable manner. On the outer periphery of the arbor 4, pin-shaped engaging portions 6 projecting from both sides with an interval of 180 ° and protruding portions 7 located below between the engaging portions 6 are provided upright. . Further, the work table 1 is provided with a stopper 9 that is connected to a drive unit 8 such as a rotary solenoid and abuts on the protrusion 7.

Further, a work positioning device 10 is provided on the side of the work table 1. The workpiece positioning device 10 is driven by a swivel actuator 11 to rotate about a swivel arm 12 which rotates about a swivel center parallel to the axis of the rotary drive unit 2, and a rotary arm 2 of the swivel arm 12 via a bearing 13. A moving means 16 for moving a base 14 as a rotating means for rotating with a rotating axis parallel to the axis and a cylinder 15 as a locking body driving portion mounted on the base 14 in the radial direction of the work 5. And cylinder 1
It is composed of a locking body 19 connected to the piston 17 of No. 5 via a compression spring 18. The swivel arm 12 has a clamp 20 that fixes the base 14. The moving means 16 is rotatably held on the upper part of the base 14 and is screwed into the main body of the cylinder 15, the feed screw 21, the handle 22 fixed to the end of the feed screw 21, and the main body of the cylinder 15. And a clamp 23 (see FIGS. 2 and 3) for fixing the.

FIG. 2 is a plan view of the work table 1 and the work positioning device 10, and FIG. 3 is a side view of the work positioning device 10. As shown in FIG. 2, the locking body 19 has a guide piece 25 slidably held by a plurality of guide rollers 24, and its tip is engaged between teeth 26 formed on the outer periphery of the work 5. It is something. 27 is a grindstone drive unit (not shown)
The whetstone is connected to the whetstone 27.
A spiral groove 28 corresponding to each tooth 26 is formed.
The grindstone drive unit rotates the grindstone 27 and
It has drive means for displacing the grindstone 27 in the axial direction and the direction orthogonal to the axial direction.

FIG. 4 is a plan view conceptually showing the structure for supplying the work 5 to the work table 1. In the figure, 30 is a chain conveyor that conveys a plurality of carriers 29 through an annular path, on which the work 5 is placed together with the arbor 4. Reference numeral 31 is a work transfer robot. The work transfer robot 31 includes an arm 33 that is extended and retracted by a drive unit 32, and a drive unit (not shown) that drives the drive unit 32 to rotate and move in the vertical direction. The tip of the arm 33 has a U-shape so as to surround the arbor 4, and on both sides thereof, as shown in FIG. 5, concave positioning portions with which engaging portions 6 projecting from both sides of the arbor 4 are engaged. 34 is formed. The carrier 29 is a chain conveyor 30.
Has wheels 36 rolling on the bottom surface 35 of the. Further, since the arbor 4 has the key 4a fitted into the key groove 5a formed in the work 5, the work 5 is prevented from being rotated by the arbor 4 and is detachably held.

In such a structure, the work 5 is placed on each carrier 29 of the chain conveyor 30 together with the arbor 4 in a state where the direction of the engaging portion 6 is constant.
When the carrier 29 reaches a certain position, a work transfer robot 31 is driven by a detection signal of a detector (not shown) that detects the movement of the carrier 29. That is, the arm 33 extends below the work 5 until the positioning portion 34 is located directly below the engaging portion 6 of the arbor 4, and the drive portion 32 is raised together with the arm 33, so that the work 5 and the arm 33 are brought together. Lifted by. Next, the workpiece 5 is rotated together with the arbor 4 by the rotation movement of the work transfer robot 31 and the extension movement of the arm 33.
Is conveyed until it coincides with the axis of
The arbor 4 is carried into the rotation drive unit 2 by the descending operation of 1.

The loading operation of the arbor 4 is detected by a sensor (not shown), and the upper center shaft 3 is lowered by the detection signal, and the center hole of the arbor 4 (not shown).
Engage with. After that, the work transfer robot 31 retreats from the work table 1 by the operation opposite to the above-described operation, and subsequently, the revolving arm 12 which has been standing by at the position apart from the work 5 until then, the revolving actuator 11 moves. Is driven by 90 ° to the work 5 side. Then, by extending the piston 17 of the cylinder 15, the locking body 19 is engaged between the adjacent teeth 26 of the work 5. That is, the work 5 is positioned in the rotational direction, and then the collet chuck holds the arbor 4. In this case, when the center of the locking body 19 is slightly deviated from the center between the adjacent teeth 26 of the work 5, the elasticity of the compression spring 18 reduces the resistance given to the cylinder 15 to reduce the locking body. The positions of the teeth 26 of the work 5 can be smoothly adjusted to the center of 19.

At the start of the first grinding, the clamp 2
By loosening 3 and operating the handle 22 to rotate the feed screw 21 in either direction, the cylinder 15 itself advances and retracts with respect to the work 5. That is, the position of the cylinder 15 can be adjusted according to the diameter of the work 5.
Further, by loosening the clamp 20 and rotating the base 14 around the bearing 13, the orientation of the cylinder 15 can be adjusted. Therefore, even if there is a manufacturing error in the device itself, the locking body 19 is always kept. It is possible to avoid the state in which the force in the rotation direction acts on the work 5 before the arbor 4 is held by the collet chuck, by advancing toward the axis of the work 5, and thereby the position of the work 5 in the rotation direction is avoided. The alignment can be performed more accurately.

After the arbor 4 is held by the collet chuck, the revolving actuator 11 revolves around the revolving arm 12.
Is retracted in a direction away from the work 5, the rotation drive unit 2 is driven to rotate the work 5 together with the arbor 4, and the tooth 26 is ground by the rotating grindstone 27. After grinding, even if the grindstone 27 is separated from the work 5 and the rotation drive unit 2 is stopped, the work 5 rotates at low speed due to inertia, but during this time, the drive unit 8 rotates the stopper 9 toward the center of the arbor 4. As a result, the stopper 9 and the projection 7 come into contact with each other, so that the arbor 4 is aligned with the positioning portion 34 of the work robot 31 in the same manner as when the work transfer robot 31 carries the work table 1. Will be stopped. As a result, the work 5 and the arbor 4 that have been ground can be easily carried out by the work transfer robot 31.
The work 5 carried out is carried out together with the arbor 4 onto the carrier 29 of the chain conveyor 30. The same purpose can be achieved by making the position of the stopper 9 correspond to the engaging portion 6 and bringing the engaging portion 6 into contact with the stopper 9 as a projection to stop the arbor 4. In this case, the stopper 9 may be retracted from the engaging portion 6 immediately before the work transfer robot 31 is carried out.

In the second and subsequent grinding operations, as described above, the work 5 and the arbor 4 on the chain conveyor 30 are carried onto the rotary drive unit 2 by the work transfer robot 31, and the revolving arm 12 is moved to the work 5 side. The position of the work 5 in the rotational direction is determined by rotating the work body 5 by rotating the locking body 19 by the cylinder 15, but the position of the cylinder 15 itself is already determined by the feed screw 21 prior to the first grinding operation, and the base 14 Since the orientation of the cylinder 15 is adjusted by adjusting the position in the rotation direction of the above, these adjustment operations are unnecessary. Therefore, when grinding the same work 5, the work 5 can be automatically loaded and unloaded, the work 5 can be aligned in the rotational direction, and the grinding can be performed without manpower.

When arranging the work transfer robot 31 and the work positioning apparatus 10 so that the movement path of the work transfer robot 31 and the movement path of the work positioning device 10 do not interfere with each other, the swivel arm that retracts the cylinder 15 from the movement path of the work transfer robot 31. 12 is unnecessary. Further, instead of the cylinder 15, a solenoid or the like can be used as the locking body drive section.

Further, in the above embodiment, the work 5 has an involute tooth profile, but in order to accurately determine the position of the work 5 in the rotation direction, the locking member 19 is used.
Must be brought into contact with the tooth surface without contacting the root between the adjacent teeth 26, and therefore the tip of the locking body 19 is preferably spherical. In particular, when a gear having a cycloidal tooth profile, such as an external gear (curved plate) of an internally meshing planetary gear, is machined as the workpiece 5, a spherical surface having a radius larger than the radius of the base of the locking body 19 is used. Is preferably formed at the tip of the locking body 19.

[0023]

The invention according to claim 1 is as described above.
A work transfer that has an engaging part on the outer periphery of the arbor that holds the work, has a positioning part that engages with the engaging part, and carries the arbor into and out of the axis of the rotation drive part together with the work with a predetermined action pattern. A robot is provided, and a locking body drive unit that drives a locking body that engages between adjacent teeth of the work loaded into the rotation driving unit together with the arbor so as to move back and forth in the radial direction of the work is provided. Since the moving unit for moving the drive unit in the radial direction of the work is provided, the relative positional relationship between the arbor and the work transfer robot becomes constant due to the engagement between the engagement unit of the arbor and the positioning unit of the work transfer robot, and Since the action pattern of the work transfer robot is constant, the arbor and the work can be carried into a substantially fixed position on the axis of the rotation drive unit, and the work transfer robot can be rotated. A state in which the position in the rotational direction of the work is determined by retracting the moving part from the axial center to the outside and then driving the locking body drive part to engage the locking body between the teeth of the work. Thus, the arbor can be held by the chuck of the rotation drive unit, and thus, even when the engagement body is retracted to the outside of the work by the engagement body drive unit, the rotation direction resistance of the rotation drive unit causes the arbor and the arbor to move. It is possible to stabilize the position of the workpiece in the rotation direction. Therefore, by rotating the rotary drive unit and the grindstone drive unit synchronously to bring the grindstone into contact with the work, the grinding work can be performed without manually adjusting the position of the work. Further, by moving the locking body drive portion itself in the radial direction of the work by the moving means, it is possible to position the works having different outer diameters by the locking body.

According to a second aspect of the present invention, in the first aspect of the present invention, the locking body is connected to the locking body drive portion via a compression spring, so that the center of the tooth between adjacent teeth of the work is compared. When the center of the locking body is slightly deviated, it is possible to reduce the resistance given to the locking body drive portion by the elasticity of the compression spring, and the position of the tooth of the work can be smoothly aligned with the center of the locking body.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a protrusion is formed on the outer periphery of the arbor, and the protrusion of the arbor is rotated by inertia immediately after the rotation drive unit is stopped. Since the stopper that protrudes into the locus is provided so that it can move back and forth, the work rotates at low speed due to inertia even if the rotation drive unit is stopped after grinding, but by advancing the stopper toward the center of the arbor during this, Since the stopper and the protrusion come into contact with each other, the engaging part can be stopped in a state of being aligned with the positioning part of the work robot, as when the arbor is loaded onto the work table by the work transfer robot. It is possible to easily carry out the work and the arbor, which have been ground, by the work transfer robot.

According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, the rotating means is provided for rotatably supporting the moving means with an axis parallel to the axis of the rotary drive section. Therefore, the direction of the locking body drive portion can be adjusted by the rotating means, and thus, even if a manufacturing error occurs in the device, the locking body can always be advanced toward the axial center of the work. It is possible to avoid a state in which a force in the rotational direction acts on the work before the arbor is held by the chuck, and thus, the work can be more accurately aligned in the rotational direction.

[Brief description of drawings]

FIG. 1 is a front view of a work table and a work positioning device according to an embodiment of the present invention.

FIG. 2 is a plan view of a work table and a work positioning device.

FIG. 3 is a side view of the work positioning device.

FIG. 4 is a plan view conceptually showing a structure for supplying a work to a work table.

FIG. 5 is a vertical cross-sectional side view showing a support structure for a workpiece on standby.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work table 2 Rotation drive part 4 Arbor 5 Work piece 6 Engagement part 7 Projection part 9 Stopper 14 Rotating means 15 Locking body drive part 16 Moving means 18 Compression spring 19 Locking body 26 Teeth 27 Grindstone 28 Groove 31 Work transfer robot

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Toshiaki Hidaka, Toshiaki Hidaka, 2993, Osato, Gohara, Annaka City, Gunma Prefecture Okamoto Machine Tool Manufacturing Co., Ltd., Annaka Plant (72) Inventor, Kazuhiro Miyamae Asahi Town, Obu City, Aichi Prefecture 6-1-1 Sumitomo Heavy Industries, Ltd. Nagoya Works (72) Inventor Hiroshi Yamamoto 6-1-1, Asahi-cho, Obu City, Aichi Prefecture Sumitomo Heavy Industries, Ltd. Nagoya Works

Claims (4)

[Claims] 1. A work table provided with an arbor for holding and holding the center of a work having a large number of teeth formed on its outer periphery, and a rotary drive unit having a chuck for detachably holding the arbor, A grindstone driving unit that drives a grindstone in which grooves corresponding to the teeth of the work are formed on the outer periphery, and a positioning unit that engages with an engaging unit provided on the outer periphery of the arbor, and have a predetermined action pattern. A work transfer robot for loading and unloading the arbor with the work onto and from the axis of the rotary drive unit, and a locking body that engages between adjacent teeth of the work loaded into the rotary drive unit together with the arbor. A gear grinding, comprising: a locking body drive part for driving the workpiece in a radial direction of the work, and a moving means for moving the locking body drive part in the radial direction of the work. apparatus. 2. The gear grinding apparatus according to claim 1, wherein the locking body is connected to the locking body drive section via a compression spring. 3. A protrusion is formed on the outer periphery of the arbor, and a stopper is provided so as to be capable of advancing and retracting so as to project into a rotation locus of the protrusion of the arbor that rotates due to inertia immediately after the rotation drive unit is stopped. The gear grinding device according to claim 1 or 2. 4. The gear grinding apparatus according to claim 1, further comprising a rotating means for rotatably supporting the moving means with an axis parallel to the axis of the rotary drive unit.