JP2003300115A - Machining center capable of machining gear and machining method for gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To subsequently carry cut chamfering and other processing by a machining center. <P>SOLUTION: A chamfering tool 10a is attached to a main shaft of a machining center. A gear 14 is held by a turnable jig 15. The main shaft is moved with a linear shaft circular interpolation between an original position P1 and a retreated position P2 by a chamfering tool movement control device. In synchronous to the main shaft moving from the original position to the retreated position P2, turning dividing of the jig 14 is carried out and a corner 32 of the divided tooth is chamfered by the movement from the retreated position P2 to the original position P1 of the main shaft. Such a processing is repeated to complete the chamfering processing. The chamfering tool 10a of the main shaft is exchanged with other gear processing tool by an ATC and other gear processing is subsequently carried out. Since the main shaft is moved at a linear shaft circular interpolation, vibration caused by the movement of the main shaft is inhibited, and durability of the machining center is enhanced. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining center capable of machining a gear and a gear machining method, and more particularly,
The present invention relates to a machining center and a gear machining method capable of continuously performing a machining different from the chamfering with the same machining apparatus.

[0002]

2. Description of the Related Art Conventionally, in the processing of gears that have been gear-cut, generally, after chamfering with a dedicated chamfering machine, processing of oil holes and the like has been performed with another processing machine. As a chamfering machine for chamfering the tooth ends of conventional gears.
The one disclosed in No. 21 is known. This is a tool that has a blade at the tip for chamfering a gear (chamfering tool), a tool shaft head that supports the tool to rotate, and a drive that makes the center axis of the tool an arbitrary angle with respect to the center axis of the gear. It comprises a means, a driving means for moving the tool left and right, up and down, front and back with respect to the gear, and a control device for synchronizing the rotation of the gear for chamfering the feed of the tool. At the time of chamfering, the tool shaft head is fed left and right, up and down, and back and forth with respect to the gear, and it is turned at an arbitrary angle with respect to the center axis of the gear, and the position of the tooth tip is set as the chamfering start position. Next, in synchronism with the rotation of the gear, the tool is chamfered by moving from the tip of the tooth toward the bottom of the tooth along the end of the tooth profile, and the rotation of the gear is reversed and the rotation of the gear is synchronized. The chamfering process is performed by repeating the operation of moving the tool from the tooth bottom to the tip of the tooth, returning the tool to perform cutting for one tooth, and turning the gear to index the next tooth. Further, the one disclosed in the prior art of Japanese Patent Application Laid-Open No. 2-292121 is known, and a jig supporting a gear rotates one tooth by one rotation of a spindle equipped with a tool at its tip. When the blade of the rotating tool chamfers the gear, the next tooth is indexed while the blade moves in a position where it does not interfere with the teeth of the gear. It was supposed to be chamfered.

Further, the one disclosed in Japanese Patent Laid-Open No. 2-76623 is known. This is because the tool is attached to the main shaft so that it can be replaced.
It is possible to move back and forth, and the spindle of the tool can be displaced from a position perpendicular to the axial direction of the gear to a position parallel to it.Instead of the chamfering tool, another machining tool can be attached to the spindle. It was possible to perform processing other than chamfering. When chamfering a gear, the movement of the chamfering tool in the direction of the gear axis and the rotation of the gear are synchronized. Although the gear is not chamfered, it is formed by gear cutting by a machining center, and the gear is exchanged with the gear cutting tool mounted on the main spindle and other machining tools by ATC. Then, those which subsequently perform punching and the like are disclosed in JP-A-2000-190127 and JP-A-2000-141129.

[0004]

What is described in the above-mentioned prior art is a dedicated gear chamfering machine, which cannot perform processing other than chamfering, and after chamfering, processing other than chamfering. In doing so, the gear had to be machined with another machine tool. Also ,,,
Since it is a dedicated chamfering machine, it is expensive. In ,, the rotation of the gear and the mechanism that moves the tool and gear relatively to the left, right, up and down, front and back, and the rotation axis of the tool with respect to the axis of the gear Since it is equipped with a mechanism, the dedicated machine tool has a complicated structure and is more expensive. In addition, although the chamfering processing is performed in synchronization with the rotation of the gear to be processed and the movement of the tool, there is no description about the control of the movement of the tool, and when the tool simply reciprocates with respect to the teeth of the gear, If a short distance for chamfering is moved at high speed, vibration may occur due to the inertia of the reciprocating movement and the like, and the durability may be significantly reduced. In addition, in the case of one, since the chamfering of one tooth and the indexing of the next tooth are performed in synchronization with one rotation of the tool, the cutting speed of the tool cannot be made high, and
When chamfering, if the chamfering amount of one tooth is increased, the tool will be caught in the chamfered part of the tooth and hinder rotation.
The amount of chamfering of the teeth could not be increased.

Further, similarly to the above, there is no description about the control of the forward / backward movement of the tool, and there is a similar problem. Furthermore, in addition to chamfering, machining such as drilling can be performed on the gear, but when changing the angle between the axis of the tool and the axis of the gear, loosen the bolts and change the tool. In this case, since an automatic tool changer (ATC) is not provided, it is considered that the operator will make a setup change, which is troublesome and takes a long time for the changing work.

Since and are special chamfering machines, when they are incorporated into a transfer line, it is impossible to machine workpieces other than gears, and when the machining process of the transfer line is changed, the chamfering machine is arranged. Change
Alternatively, when the chamfering process is not necessary, it is necessary to replace the chamfering machine with a machining center or the like, which makes it impossible to flexibly rearrange the transfer line.

[0007] In addition, in the above, gear cutting is performed by a machining center to form a gear, and subsequently, other drilling is performed, so that the gear is formed, and then the gear is transferred to the next process or the setup is changed. It does not require multiple devices for gear cutting and other machining processes, but does not describe chamfering. Therefore, even if chamfering is to be performed in combination with or, if the gear is swung and the gear and tool are relatively moved forward and backward as described above, vibration of the column or table will occur due to the influence of inertia, etc. However, there is a problem that the durability of the machining center is deteriorated. An object of the present application is to provide a machining center which has high durability, can be chamfered at a low cost with a large amount of cutting, can accurately perform chamfering of gears, and can continuously perform other machining after chamfering.

[0008]

In order to solve the above problems, in the present invention, a jig for holding a gear so that it can be swivelly indexed in the circumferential direction of the gear, an axial direction parallel to the axis of the gear, and the axis thereof. A tool accommodating a rotatable main spindle that is capable of relative movement with respect to a gear in two orthogonal axis directions and that allows a tool to be interchangeably mounted, a chamfering tool for gears, and other gear machining tools. Equipped with a magazine and an automatic tool changer for exchanging tools between the tool magazine and the spindle, the original position of the spindle is set as the chamfering end position where the tip of the chamfering tool enters from the tooth end face to the inside of the gear axial direction, and the spindle is A chamfering tool movement control device that reciprocates by linear axis circular interpolation in a direction parallel to the axis of the gear between its original position and the retracted position where the chamfering tool separates from the tooth end surface, and the chamfering tool moves from the original position to the retracted position. In synchronism with movement, and a indexing control device for one tooth turning indexing the jig by repeating the reciprocating movement and the jig of the turning indexing operation of the chamfering tool 1
After the chamfering of the toothed gear is completed, the chamfering tool and the other gear machining tools are exchanged, and another machining is subsequently performed on the gear (claim 1).

When chamfering the corner of the tooth end surface, the angle of the blade of the tip of the chamfering tool and the corner angle of the tooth end surface can be substantially matched (claim 2). .

Further, the jig holds the gear so as to be pivotally indexable in the circumferential direction of the gear, and is relatively movable in an axial direction parallel to the axis of the gear and two axial directions orthogonal to the axis. A chamfering tool that mounts a gear chamfering tool from a tool magazine using an automatic tool changer to a rotatably supported spindle that chamfers the original position of the spindle from the tooth end surface to the inside of the gear axial direction. At the end position, while the spindle is moving from its original position to the retracted position where the chamfering tool separates from the tooth end face in the direction parallel to the axis of the gear by linear axis circular interpolation, the jig is swiveled for one tooth and retracted. Move the chamfering tool that has moved to the original position to the original position in the direction parallel to the axis of the gear by linear axis circular interpolation to perform the chamfering of the gear by repeating the operation of machining the corner of the tooth end face. After the chamfering of the corners of the tooth end surface is completed, the tool of the spindle is exchanged, a chamfering tool and a gear machining tool different from the chamfering tool are mounted on the spindle, and subsequently the gear is subjected to machining other than chamfering (claim) Item 3).

As described above, when the chamfering process is performed, the main shaft and the gear are reciprocally moved in the gear axis direction in a linear axis circular interpolation between the original position and the retracted position. The speed increases and reaches the maximum speed at the intermediate position between the original position and the retracted position, the speed gradually decreases from that intermediate position toward the retracted position, the moving direction reverses at the retracted position, and the retracted position moves to the original position. In contrast to the above, the object moves toward and decelerating toward and away from, so that the vibration due to the influence of inertia due to the relative movement of the tool and the gear is suppressed, and the durability of the machining center is improved. At this time, since the chamfering process is performed from the middle of the movement from the retracted position to the original position until the original position is reached, even if the spindle is moved relative to the jig by linear axis circular interpolation,
Since the spindle is accurately detected and stopped at the original position, unnecessary chamfering is not performed and chamfering can be performed accurately. In addition, after the chamfering of the gear is completed, the spindle tool is replaced and the machining other than the chamfering is continued. Therefore, a dedicated chamfering machine and a machine tool for the two gears of the machine tool that performs the machining other than the chamfer are prepared. There is no need, and there is no need to transfer the chamfering machine to the next machine tool. Further, since the machining center is configured as described above so that chamfering processing and other processing can be performed, even if a work other than a gear is transferred, it is a tool for gear processing when it is incorporated in the transfer line. A tool magazine other than the above can be installed in the tool magazine, and the work other than gears can be machined by exchanging it with the automatic tool exchanging device as appropriate, and even if the machining process on the transfer line is changed, the machining center can be used for other machining as it is. Can be used as a device,
Can flexibly change transfer lines. Also,
The chamfering is performed by rotating the tool at a high speed by the spindle, so that the cutting amount can be increased and the machining can be sufficiently performed even if the chamfering amount of one tooth is large.

[0012]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, in a machining center 1, a column 3 is provided on a bed 2 thereof so as to be movable in the left-right direction (X-axis direction) and the front-back direction (Y-axis direction), and the column 3 is vertically moved. A spindle head 4 is provided so as to be movable in the (Z-axis direction). The column 3 is moved by ball screws (not shown) driven by the X-axis motor 5 and the Y-axis motor 6, respectively. The spindle head 4 is moved up and down by a ball screw (not shown) driven by a Z-axis motor 7. A spindle 9 driven by a spindle motor 8 is rotatably supported by the spindle head 4 in a downward direction, and a tool 10 is attached to the tip of the spindle 9. Further, on the side surface of the column 3, there is a patent No. 2865195.
The automatic tool changer 11 is substantially the same as the automatic tool changer (ATC) disclosed in the above publication. The automatic tool changer 11 is composed of a change arm 12 and a tool magazine 13. The exchange arm 12 is provided in the vicinity of the main shaft 9, and moves the tool 10 between the main shaft 9 and the tool magazine 13 by moving up and down in the Z-axis direction and rotating 180 degrees. The tool magazine 13 is provided on the side surface of the column 3, and accommodates a plurality of chamfering tools 10a for the gears 14 and other gear machining tools 10b that can be indexed.
In addition, the gear 1 is provided in the processing space in front of the column 3 on the bed 2.
A jig 15 for holding 4 is arranged. The jig 15 is
The gear 14 is provided with an A-axis motor 16 that enables an A-axis rotation about an axis parallel to the X-axis and a B-axis motor 17 that enables a B-axis rotation about an axis parallel to the Z-axis. Hold so that the axis and the A-axis are coaxial.

The motors 5, 6, 7, 16, 17 described above
Is a servo motor, and these are controlled by a control device 18 provided in the machining center 1 (FIG. 2). Further, the motors 5, 6, 7, 16 and 17 are encoders 19, 20, 21 and 2 for detecting their own rotation amounts, respectively.
2, 23, and each encoder 19, 20, 2
The signals from 1, 22, 23 are transmitted to the control device 18 as position information indicating the relative positional relationship between the tool 10 and the gear 14. The control device 18 controls the drive and stop of the spindle motor 8, the swing control for driving the A-axis motor 16 and the B-axis motor 17 to swing the jig 15, the X-axis motor 5, the Y-axis motor 6, and the Z-axis. The shaft motor 7 is controlled to move the column 3 and the spindle head 4 to perform the machining of the gear 14, and the tool exchange between the spindle 9 and the tool magazine 13 according to the machining of the gear 14 is controlled.

Further, the control device 18 is provided with a chamfering tool movement control device 24 and an indexing control device 25 as shown in FIG. The chamfering tool movement control device 24 drives and controls the X-axis motor 6 at the time of chamfering the gear 14, and reciprocates the spindle 9 from the original position P1 to the retracted position P2 by linear axis circular interpolation. The original position P1 of the spindle 9 is shown in FIG.
As shown in (a) of FIG. 4, it is a chamfering finishing position that enters from the tooth end face 31 to the inside of the gear 14 in the axial direction (A-axis direction), and the standby position P2 is (c) of FIGS. As shown in, the chamfering tool 10a is located away from the tooth end surface 31. The chamfering tool movement control device 24 moves the main shaft 9 in the gear axis direction, so that the chamfering tool 10a moves.
On the return trip from the retracted position P2 to the original position P1,
One of the corners 32 of the tooth end surface 31 is cut from the tip of the ridgeline toward the inner side in the axial direction of the gear 14. The indexing control device 25 synchronizes with the movement of the spindle 9 from the original position P1 toward the retracted position P2, and the spindle 9 moves from the original position P1 to the retracted position P2.
During the forward movement toward 2, the jig is indexed by turning one tooth in a direction in which the other corner 33 of the tooth end surface 31 escapes from the cutter 29 of the chamfering tool 10a.

The linear axis circular interpolation is a function provided in the control device 18 of the machining center 1 and is orthogonal to two.
In circular interpolation movement in which one feed axis is controlled simultaneously and the main axis revolves at a constant speed relative to the workpiece, the speed of one feed axis is set to 0 and the feed speed of the other feed axis is accelerated and decelerated. Then, the spindle and the work are relatively linearly moved. Here, the speed is 0 in the Y-axis direction, and the acceleration / deceleration is in the X-axis direction. When the spindle 9 is moved by circular interpolation, the spindle 9 makes a uniform circular motion on the circle C1 as shown in FIG. 5A, but at this time, the velocity component Vx in the X-axis direction and the velocity component in the Y-axis direction. Are accelerating and decelerating while drawing a sine curve respectively, so if the velocity component in the Y-axis direction is set to 0 by linear-axis circular interpolation, the spindle 9 moves in the X-axis direction drawing the sine curve shown in FIG. 5B. It reciprocates in the X-axis direction by accelerating and decelerating the velocity component Vx.

As shown in FIG. 6, a chamfering tool 10a mounted on the tip of the spindle 9 during chamfering has a plurality of throwaway square tips 29 attached to the tip of a tool holder 28. The blade protrudes in a direction orthogonal to the spindle axis direction, and the axis of the gear 14 (A axis axis) and the spindle axis (Z axis axis) are orthogonal to each other from one tooth end surface 31 to the blade of the chamfering tool 10a. Tooth tip is tooth groove 30
The corner 32 of the tooth end surface 31 can be chamfered by entering the inside and rotating the main shaft 9. In addition, 26 represents a tooth bottom and 27 represents a tooth tip.

Next, chamfering of the gear 14 will be described. As shown in FIG. 6, a chamfering tool 10 is attached to the tip of the spindle 9.
a is attached, and the gear (internal gear) 14 is held by the jig 15 so that the axis of the gear 14 and the A axis are coaxial.
First, by the control device 18, the jig 15 is rotated and the main shaft 9 is moved so that the inclination of the blade of the tip 29 of the chamfering tool 10a and the chamfering of the tooth end face 31 of the gear 14 are chamfered as shown in FIG. The inclination of the corner 32 is made substantially parallel. That is, the angle α between the xy plane and the chip 29 and the angle β between the xy plane and the chamfered corner 32 are set to α≈β.

Next, the chamfering process for one tooth is completed, and the spindle 9
Will be described starting from the state where is located at the original position P1. The spindle 9
The chamfering tool 10a is moved from the original position P1 toward the outside of the gear 14 in the A-axis direction at a feed rate described below by linear-axis circular interpolation.
Moves to the retracted position P2 away from the tooth end surface 31. While the main shaft 9 moves from the original position P1 to the retracted position P2, in synchronization with the movement of the main shaft 9, (b) of FIG.
As shown in (b) of FIG.
The jig 15 is divided into one tooth by the A-axis rotation at the timing shown in FIG. At this time, the jig 15 rotates in a direction in which the other corner 33 of the tooth end surface 31 escapes from the chamfering tool 10a as shown in FIGS. 3 and 4, so that the other corner 33 and the blade of the chamfering tool 10a interfere with each other. However, the other corner 33 may be slightly cut to such an extent that the function of the gear 14 is not affected.

When the main shaft 9 reaches the retracted position P2 (FIG. 3 (c), FIG. 4 (c)), it is reversed and linearly linearly circularly interpolated toward the original position P1, and the teeth indexed in the middle. Nokado 32
8 (FIG. 3 (d), FIG. 4 (d)),
As shown in FIG. 5, the corner 32 is chamfered while the velocity component Vx of the spindle 9 in the X-axis direction is decelerated, and the original position P
When it is detected that the spindle 9 is located at 1, the movement of the spindle 9 is stopped, and the original position P1 is processed next again, as in (a) of FIG. 3 and (b) of FIG. The original position P1 of the corner 32 is set. Repeat this step to turn 32
The chamfering process is performed, and all the corners 32 are chamfered. At this time, cutting is performed by the spindle 9 that rotates at a high speed. Therefore, even in the case of chamfering with a large amount of cutting, the slow-away square tip 29 that rotates at a high speed can be used for corner cutting.
It is possible to chamfer because it cuts every 2 times many times. Note that, in FIGS. 3 and 4, the shaded portions indicate chamfered portions.

At the time of this chamfering, the spindle 9 reciprocates along the X axis, but the movement of the spindle 9 by the linear axis circular interpolation by the chamfering tool movement control device 24 follows the sine curve shown in FIG. 5B. As shown, the speed increases from the original position P1, reaches the maximum speed at an intermediate position between the original position P1 and the shelter position P2, and further decreases toward the shelter position P2, from the shelter position P2 to the original position P1. In the case of reversing and moving, the speed is controlled in the opposite direction from the case of going from the original position P1 to the retracted position P2, and the traveling speed of the spindle 9 is set to 0 between the original position P1 and the retracted position P2, and the traveling direction of the spindle 9 is changed. Since it is inverted, vibration of the column 3 due to the influence of inertia or the like is suppressed, and the durability of the machining center 1 is improved. Next, when chamfering is completed for all teeth,
The chamfering tool 10a and another tool 10b are exchanged between the tool magazine 13 and the spindle 9 by the exchanging arm 12, and subsequently, the gear 14 is subjected to machining other than chamfering (for example, machining of an oil hole shown in FIG. 9). . This eliminates the need for preparing a chamfering machine and a plurality of machine tools for machining other than chamfering, and carrying the chamfering machine from the chamfering machine to the next machine tool.

When chamfering the gear 14, the main shaft 9 is moved by the linear axis circular interpolation as described above. The linear axis circular interpolation is performed by the two feed axes (X
This is circular interpolation in which the speed of one of the feed axis (Y axis) of the axes (Y and Y) is 0. Generally, in the circular interpolation, when the moving distance of the spindle 9 is small and the feed speed is fast, the trajectory of the spindle 9 does not draw a complete circle due to the response delay of the motor that drives the feed screw, and the like. As shown in FIG. 10, the locus is near the movement start position P3 of the spindle 9 and the stop position P.
In the vicinity of 4, the bulge diametrically outward from the locus of the circle C2. Because of the bulge C3 with respect to the locus of drawing the circle C2,
The position of the main shaft 9 during movement varies and the main shaft 9 during movement
If the position of the spindle has to be detected, the position of the spindle cannot be detected, or the movement of the spindle 9 must be stopped in order to detect the position, and it takes time to detect. Therefore, the movement of the chamfering tool 10a is changed to the original position P1.
If it is started from a position other than, the original position P1 becomes an intermediate position in the linear axis circular interpolation movement. Therefore, if the position of the spindle 9 is not detected, it will be more than necessary because of the deviation (bulge) C3 of the trajectory of the circle C2 of the spindle 9 drawn. Moreover, there is a possibility that the corner 32 may be deeply cut from the tooth end surface 31 toward the inner side in the axial direction of the gear 14. In order to prevent this, the tip 29 moves the movement start position P3 and the stop position P4 of the main shaft 9 where the position of the main shaft 9 is detected every time.
Is aligned with the original position P1 of the spindle 9 when the chamfering end position inside the A axis direction is reached so that the chamfering is not in the middle of the spindle movement and is not cut more than necessary due to the influence of the shift C3. To do so. Also, gear 1
The withdrawal position P2 that does not interfere with 4 is set to the return position which is the intermediate position of the linear axis circular interpolation movement. Since the blade of the chamfering tool 10a does not interfere with the gear 14 at the retracted position P2, the accuracy of the chamfering process is not affected even if the exact position of the main shaft 9 is not known, so an accurate position detection process is unnecessary. It contributes to shortening the processing time. In this way, the movement start position P3 and the stop position P4 are the original position P1, and the retracted position P2
Is set as an intermediate position of the linear axis circular interpolation movement to improve the accuracy of chamfering and shorten the processing time.

The machining center 1 for chamfering configured as described above is similar to a normal machining center. When it is incorporated in a transfer line, tools other than the gear machining tools 10a and 10b are used. If the work is also accommodated in the tool magazine 13, when the work of the gear 14 is processed and another work is conveyed, the work corresponding to the work can be performed. And even if the machining process on the transfer line changes, it is not a dedicated chamfering machine, so it can be used as it is as a station for other machining without moving the machining center.
It is possible to flexibly respond to changes in the layout on the transfer line.

[0023]

As described above, according to the present invention, a jig for holding a gear so that it can be swivel-indexed in the circumferential direction of the gear, an axial direction parallel to the axial line of the gear, and a 2 axis orthogonal to the axial line. A tool magazine accommodating a rotatably supported main shaft that is relatively movable in the axial direction with respect to the gear and that can be interchangeably attached to the tool, a chamfering tool for the gear, and a gear processing tool other than that, Equipped with an automatic tool changer that exchanges tools between the tool magazine and the spindle, reciprocates the spindle from the original position to the retracted position by linear axis circular interpolation, and synchronizes with the movement of the spindle from the original position to the retracted position. Then, the jig is turned and indexed, and the corner is chamfered by moving the spindle from the retracted position to the original position, so the chamfering tool accelerates and decelerates between the original position and the retracted position by the linear axis circular interpolation movement and reciprocates. In-situ or retreat position Becomes slower as toward the, the vibration in the machining center by the inertia or the like during reversal of direction of movement of the in situ or retracted position is prevented, and durability is improved. Also, since the original position is the linear axis circular interpolation movement start position of the spindle and the chamfering machining end position, it is not affected by the instability of the spindle movement locus due to the response delay of the motor during linear axis circular interpolation movement. Precise chamfering can be performed with high accuracy.

Further, after the chamfering process is completed, the tools other than the chamfering process can be continued by exchanging the tool mounted on the spindle, so that a chamfering machine and other machine tools for machining are not required respectively, and one machining center is required. Since it is possible to process gears with a machine, it is inexpensive because it is not a dedicated machine, and there is no need for transportation from the chamfering machine to a machine tool for machining gears other than chamfering the gears, installation space for each machine tool, and the like. Further, since the machining center performs chamfering, it can be machined even when workpieces other than gears are transferred when it is built into the transfer line, and when changing the configuration of the transfer line, a dedicated chamfering machine is used. Since it is not, it can be used as a device for other processing and is flexible. Further, the chamfering is performed by rotating the tool at a high speed by the spindle, so that the cutting amount of the tool is large and the cutting can be sufficiently performed even if the chamfering amount of one tooth is large.

[Brief description of drawings]

FIG. 1 is a side view of a machining center according to the present invention.

FIG. 2 is a block diagram showing a control system of a machining center.

FIG. 3 is an explanatory diagram showing an outline of a chamfering process viewed from the X-axis direction.

FIG. 4 is an explanatory diagram showing an outline of a chamfering process viewed from the Y-axis direction.

FIG. 5 is an explanatory diagram showing acceleration / deceleration of a spindle.

FIG. 6 is a view showing a gear and a chamfering tool.

FIG. 7 is an explanatory diagram showing the relationship between the tip inclination and the chamfered tooth inclination.

FIG. 8 is an explanatory diagram showing the timings of movement of the spindle and swivel indexing of the jig.

FIG. 9 is a diagram showing processing other than chamfering processing.

FIG. 10 is an explanatory diagram showing a main axis movement locus at the time of circular interpolation.

[Explanation of symbols]

1 Machining center 9 spindle 10a Chamfering tool 10b Another tool 11 Automatic tool changer 13 Tool Magazine 14 gears 15 jigs 24 Chamfering tool movement control device 25 Indexing control device 29 chips 31 tooth end face 32 Corner of tooth end face P1 home position P2 retracted position

Claims (3)

[Claims] 1. A jig for holding a gear so as to be able to swivel and index in the circumferential direction of the gear, and relatively movable with respect to the gear in an axial direction parallel to the axial line of the gear and two axial directions orthogonal to the axial line. And a tool magazine accommodating a rotatably rotatably supported spindle, a gear chamfering tool and other gear machining tools, and exchanging tools between the tool magazine and the spindle. Equipped with an automatic tool changer, the original position of the main spindle is the chamfering end position where the tip of the chamfering tool has entered the tooth end face inward in the axial direction of the gear, and the main spindle is the retracted position where the original position and the chamfering tool leave the tooth end face. Up to 1 tooth in synchronization with the chamfering tool movement control device that moves the chamfering tool back and forth in a direction parallel to the axis of the gear by linear axis circular interpolation in synchronization with the movement of the chamfering tool from the original position to the retracted position. Minute turning index The chamfering tool is replaced with another gear machining tool after the chamfering of the gear is completed by repeating the reciprocating movement of the chamfering tool and the swiveling and indexing operation of the jig. A machining center capable of machining a gear, which is characterized in that the gear is continuously machined differently. 2. When chamfering the corner of the tooth end surface,
The machining center capable of machining a gear according to claim 1, wherein the angle of the blade of the tip of the chamfering tool and the corner angle of the tooth end face can be substantially matched. 3. A jig holds a gear so as to be pivotally indexable in the circumferential direction of the gear, and is relatively movable in an axial direction parallel to the axis of the gear and two axial directions orthogonal to the axis. A chamfering tool that mounts a gear chamfering tool from a tool magazine using an automatic tool changer to a rotatably supported spindle that chamfers the original position of the spindle from the tooth end surface to the inside of the gear axial direction. At the end position, while the spindle is moving from its original position to the retracted position where the chamfering tool separates from the tooth end face in the direction parallel to the axis of the gear by linear axis circular interpolation, the jig is swiveled for one tooth and retracted. Move the chamfering tool that has moved to the original position to the original position in the direction parallel to the axis of the gear by linear axis circular interpolation to repeat the operation of machining the corners of the tooth end face and perform the chamfering of the gear. end After finishing the chamfering of the corner of the surface,
A method for machining a gear, characterized in that a tool for the spindle is exchanged, a gear machining tool different from the chamfering tool is attached to the spindle, and then the gear is subjected to machining other than chamfering.