JPH067849Y2 - Boring equipment for machining centers - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is for a machining center applied to a machining center having an automatic tool changer and capable of continuously performing various processes on one work. It relates to a boring device.

[Conventional technology]

The boring device is used, for example, for boring a hole formed in a drilling machine and expanding the diameter of the hole. As a boring device of this kind, for example, the actual exploitation 58
As disclosed in Japanese Patent Application Laid-Open No. 173416, while rotating a boring tool at the front end of the boring tool, the boring tool is moved in the front-rear direction by a cylinder to machine a hole into a tapered shape. ing.

By the way, for one work, a working process of a plurality of processes using a plurality of types of tools is usually performed.
Even when the above boring device is used for drilling, drilling with a drilling machine is required in advance.

Therefore, in order to enable the machining center to perform the above-described series of machining, it is desired that each tool be adapted to each machining center. In this machining center, for example, various tools held in a disk-shaped tool magazine can be selectively mounted on a spindle by an automatic changer, and various machining can be sequentially performed on a work clamped on a table. It was done like this.

As an example of a device that can be used for such a machining center, for example, Japanese Patent Laid-Open No. 60-207763 discloses a honing device that has a grindstone for polishing and is detachably attached to the machining center. There is.

In this honing device, the grindstone provided at the front end is driven to rotate by mounting it on the main shaft of the machining center,
As a result, the work is polished and finished. In addition, a motor is separately provided, and the outer diameter of the grindstone can be varied by moving the grindstone in the front-rear direction by the motor.

On the other hand, the boring device also needs to rotate the boring tool at the front end and move the boring tool in the front-rear direction.Therefore, in addition to the structure that can be attached to and detached from the spindle of the machining center as described above, the front end can be moved by the motor. It is conceivable that the tool may be configured as a boring device for a machining center by incorporating a mechanism for causing the tool to move in the front-back direction.

[Problems to be solved by the device]

However, in the honing device described above, in order to decelerate the rotation of the motor and transmit this as the movement of the grindstone in the front-rear direction, a complicated driving force transmission mechanism including a large number of gears and the like is incorporated inside the device. . Therefore, if this is used as it is to construct a boring machine for a machining center, the entire machine becomes large and the weight increases. Such a structure is unsuitable for a machining center equipped with a large number of other tools, and the weight itself causes a bending of the tool itself, which causes a problem that machining cannot be performed with good accuracy.

[Means for Solving the Problems]

In order to solve the above problems, the boring machine for a machining center of the present invention is taken out from a tool magazine of a machining center and mounted on a spindle of a machining center.
Further, a casing member to which the rotational power from the main shaft is input, a moving member that is movable back and forth in the casing member, and is rotatably mounted integrally with the casing member, and provided at a front end portion of the moving member. A boring tool, and a connecting member externally fitted to the casing member so as to be movable back and forth, having an inner body that engages with the moving member on the inner side, and an outer body that is relatively rotatable with respect to the inner body on the outer side; When the casing member is attached to the main shaft of the machining center and is in the processing position, the outer body engages with the drive member that moves in the front-rear direction in the drive means provided on the main shaft head side of the machining center, It is characterized in that the moving member moves in the front-rear direction.

[Action]

According to the above configuration, when the casing member is mounted on the main shaft of the machining center, rotational power is transmitted from the main shaft to the casing member, and when the casing member rotates,
The moving member and the boring tool mounted inside rotate.

On the other hand, when the driving body is moved in the front-rear direction by the driving means provided on the spindle head side, the outer body of the connecting member engaged with this is moved, and further, this movement is integrated with the casing of the connecting member. It is transmitted to the moving member through the rotating inner body. As a result, the boring tool moves in the front-rear direction while rotating, and the work is boring processed.

The engagement between the inner body of the connecting member and the moving member is performed by a rack gear provided on the inner body side, a rack gear provided on the moving member side, and a pinion gear provided between the two.
The driving force of the driving means may be transmitted to the moving member through the rack gear, the pinion gear and the rack gear.

As described above, in the above description, the driving means for moving the boring tool in the front-rear direction is provided on the spindle head side of the machining center, and the boring device is provided with the connecting member having the inner body and the outer body which are relatively rotatable. It is movably fitted externally. Therefore, the casing member is simply provided with a mechanism for engaging the inner member of the connecting member and the moving member in the front-rear direction. be able to. The connecting member may be composed of, for example, a radial bearing or the like.

Therefore, in order to move the boring tool in the front-rear direction, a complicated driving force transmission mechanism including a large number of gears, etc. is incorporated in order to reduce the rotation of the motor or the rotation of the spindle described above to convert it into the movement in the front-rear direction. Compared with the case where it is constituted by the above, in the above, the front-back direction driving force transmission mechanism incorporated in the boring device itself is greatly simplified, and thereby the structure is downsized and the weight is reduced. As a result, like a normal tool such as a drill or a reamer, it is possible to equip the machining center and perform boring processing with good processing accuracy.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 2, a gate-shaped column 3 is erected on one side of the head 2 in the machining center 1, and a disc-shaped tool magazine 4 is rotatable and movable back and forth on the column 3. It is supported.

As shown in FIG. 3, the tool magazine 4 has a large number of tool holding portions 4a ... At the peripheral portion at equal angular intervals.
Each tool holding portion 4a is provided with a pair of tool gripping claws 5, 5 biased in the gripping direction, and various tools 59 are held by the tool gripping claws 5, 5. Further, as shown in FIG. 2, in the inside of the column 3, a spindle which can be vertically moved between a lower processing position shown by a broken line and an upper tool exchange position shown by a two-dot chain line. A table 6 is provided.

On the other hand, a work attaching device 7 is provided on the other side of the bed 2. The work attachment device 7 is provided with a first table 9 movable along the rail 8 provided on the bed 2 in the XX ′ direction and a rail 10 provided on the first table 9. , A second table 11 movable in a direction orthogonal to the XX ′ direction,
The work 43 is clamped on the second table 11. When the headstock 6 is in the machining position, the work 43 faces the front of the headstock 12 of the headstock 6 with their axes aligned. The spindle head 12 has a spindle 12a that fits with a boring device 16 described later.

The first table 9 is moved in the XX 'direction by rotating the screw shaft 13 rotatably supported by the bed 2 by the motor 14. The second table 11 is moved in a direction orthogonal to the XX 'direction by rotating the screw shaft 15 rotatably supported by the first table 9 by a motor (not shown). .

In addition to the tools 59 such as a drill, a reamer and a milling cutter, a boring device 16 is provided in the tool holder 4a.
Is held.

As shown in FIG. 1, the boring device 16 has a case 17 as a casing member having a circular outer periphery. The case 17 is arranged at the rear end of the case 17 coaxially with the case 17. The tip portion 18a of the input shaft 18 is fitted inside. The tip portion 18a is attached to the case 1 by a screw 19.
It is fixed to 7, and the input shaft and the case 17 rotate together. A device gripping portion 18b having a V groove that is gripped by the tool gripping claws 5, 5 of the tool magazine 4 is formed in a portion of the input shaft 18 that protrudes from the case 17, and the rear end portion has the above-mentioned structure. The main spindle head 12 has a tapered main spindle mounting portion 18c which is fitted and fixed to the main spindle 12a.

A band-shaped cylindrical member 20 is slidably fitted on the outer peripheral portion of the case 17 with respect to the case 17. A bearing 21 as a connecting member having an inner ring portion (inner body) 21a on the inner side and an outer ring portion (outer body) 21b on the outer side is externally fitted to the outer peripheral portion of the cylindrical member 20.

On the other hand, from the front end portion to the rear portion inside the case 17, a circular hole-shaped moving member disposing portion 22 that is inclined with respect to the central axis of the case 17 is formed. Tip portion 18a of the input shaft 18
A spring receiving plate moving chamber 23 having a circular hole shape having a larger diameter than the moving member disposing portion 22 is formed between and. Further, a circular hole-shaped spring arranging portion 24 is formed in a portion close to the moving member arranging portion 22 inside the peripheral wall of the case 17 above the moving member arranging portion 22. Is a tool return spring 2 for urging a spring receiving plate 34 described later backward.
5 are provided. Further, in the peripheral wall of the case 17 below the moving member disposing portion 22, the rack disposing portion 26 is provided.
In the peripheral wall portion of the case 17 in the lower portion of the rack arrangement portion 26, there is formed a long hole-shaped pin moving hole 27 having a length of a range in which a connecting pin 29 described later moves.

A rack gear 28 is provided in the rack mounting portion 26, and the rack gear 28 is connected to the cylindrical member 20 by a connecting pin 29 passing through the pin moving hole 27.
Further, on the peripheral wall portion of the case 17 on the rack gear 28, a pinion gear 30 that meshes with the rack gear 28 and a rack gear 36 of a moving member 31 described later is provided.

A moving member 31 is slidably arranged in the moving member disposing portion 22 of the case 17. A pin insertion groove 32 is formed on the upper part of the moving member 31, and the pin insertion groove 3 is formed.
The tip of a rotation-stopping pin 33 penetrating the peripheral wall of the case 17 is inserted into the case 2. The rotation stopping pin 33 has a lubricating function at its tip end, and the moving member 31 can smoothly slide on the rotation stopping pin 33.

A disk-shaped spring receiving plate 34 that receives the biasing force of the tool return spring 25 is attached to the rear end surface of the moving member 31 with a screw 35. A recess is formed in the lower portion of the moving member 31, and a rack gear 36 that meshes with the pinion gear 30 is formed in this recess.

A circular hole-shaped tool attachment portion 37 having a center axis slightly parallel to the central axis of the movable member 31 and having a central axis slightly above the central axis is formed in the front portion of the movable member 31. A convex portion 37a is formed at the rear end portion. Further, below the tool mounting portion 37, a tool fixing screw 38 is provided which is inserted into the tool mounting portion 37 with its front end portion directed rearward and obliquely upward from the vicinity of the front end portion of the moving member 31.

A boring tool 39 is arranged on the tool mounting portion 37 and is fixed by a tool fixing screw 38. The front part of the boring tool 39 is a rod-shaped portion 40, and a tip 41 of this rod-shaped portion 40 is provided with a tip 41 as a cutting tooth for processing the work 43 with its tip facing forward and obliquely downward. There is. Tip 41 at the rear end of the boring tool 39
A bolt 42 for finely adjusting the forward projecting position of the is attached to the convex portion 37a of the tool mounting portion 37.

Further, the boring device 16 is the boring tool 39 described above.
It has a tool advancing / retreating drive device 44 which is a drive means for advancing / retreating. This tool advancing / retreating drive device 44 has a cylinder 45, and this cylinder 45 is used for the piston 4
A front chamber 45a and a rear chamber 45b are provided in the front and rear of 6, respectively. The piston 46 has a front rod 4 on the front side and a rear side on the rear side.
7 and the rear rod 48 are connected.

The front end of the front rod 47 is engaged with the outer ring portion 21b of the bearing 21 when the piston 46 moves rearward,
Engaging member (driving body) for moving the bearing 21 rearward
49 are provided. On the other hand, at the rear end portion of the rear rod 48, a front limit switch (hereinafter referred to as LS) 57 provided at a front-rear position along the rear rod 48 and a rear LS 58 are brought into contact with each other to operate both LS 57/58. An LS operation unit 48a is provided.

Both LSs 57 and 58 are connected to the control means 50. The control means 50 switches the solenoid valve 53 to the B position when the boring device 16 is activated, and then the rear LS 58.
Is turned on, the solenoid valve 53 is switched from the B position to the C position, and thereafter, when the front LS 57 is turned on, the solenoid valve 53 is switched from the C position to the A position.

The front chamber 45a of the cylinder 45 is connected to one inlet / outlet 53c of the solenoid valve 53 by an air supply pipe 51, and the rear chamber 45b is connected to the other inlet / outlet 53b of the solenoid valve 53 by an air supply pipe 52. A throttle valve 54 and a check valve 55 that allows only air to flow from the solenoid valve 53 in the direction of the rear chamber 45b of the cylinder 45 are interposed in parallel in the air supply conduit 52. An air supply source 56 is connected to the inlet 53a of the solenoid valve 53. Further, the solenoid valve 53 has a discharge port 53d which is an open end. The solenoid valve 53 is controlled by the control means 50 so that it can take three positions of A, B, and C, which shut off each pipeline or change the connection direction. .

The tool advancing / retreating drive device 44 configured as described above is arranged on the spindle head 12, and when the input shaft 18 is mounted on the spindle 12a of the spindle head 12, the engaging member 49 of the tool advancing / retreating drive device 44 is moved. It is adapted to engage with the bearing 21.

In the above structure, as shown in FIG. 2, the work 4 clamped on the second table 11 of the machining center 1
On the other hand, the operations of the machining center 1 and the boring device 16 when performing the boring processing subsequent to the machining in the previous step will be described below.

First, as the headstock 6 is raised from the lower machining position to the upper tool exchange position, the tool (not shown) used in the previous process and mounted on the headstock 12 of the headstock 6 is replaced by the tool magazine. 4 is held by the tool holding portion 4a, which is a vacant space of 4, by the pair of tool holding claws 5, 5, and the tool magazine 4 moves forward by a constant stroke, that is, in the Y direction, so that the tool is removed from the spindle 12a. Be done.

Next, by rotating the tool magazine 4 by a predetermined angle, the boring device 16 held by the predetermined tool holding portion 4a of the tool magazine 4 is arranged in front of the spindle head 12 so as to face it, as shown in FIG. In this state, the tool holding portion 4a is moved backward, that is, in the Y'direction. This allows
The input shaft 18 in the boring device 16 is the spindle head 1.
2 is fitted into the main shaft 12a and the main shaft 12a
It is held by a chuck device (not shown).
At the same time, the tool advancing / retreating drive device 44 provided on the spindle head 12 is arranged at a predetermined position, whereby the boring device 16 is completely attached to the spindle head 12.

At this time, the boring tool 39 is in the state of retracting to the rearmost part because the spring receiving plate 34 is pushed backward by the urging force of the tool return spring 25 and the moving member 31 is moving backward. There is. Therefore, the bearing 21 has moved to the forefront. Then, the tool advancing / retreating drive device 4
4, the solenoid valve 53 is in the A position, while the piston 46 of the cylinder 45 is in the foremost position, the front rod 47 projects the most forward, and the engaging member 49 causes the bearing 2 to move.
It is in a state of being engaged with the front part of 1.

Next, the headstock 6 descends from the above state to a predetermined position during the working operation. At this time, the tool holding claws 5 of the tool holding portion 4a holding the boring device 16 are disengaged from the device holding portion 18b of the input shaft 18 of the boring device 16, and the boring device 16 is moved to the machining position together with the headstock 6. Set. Further, when the boring device 16 is set to the machining position, the first table 9 of the work attaching device 7 located in front of the boring device 16 moves in the X'direction along the rail 8, and the tip of the boring tool 39 in the boring device 16 moves. The part and the work 43 are arranged to face each other.

When the boring tool 39 of the boring device 16 and the work 43 are set in a predetermined positional relationship as described above, the spindle 12a of the spindle head 12 is rotated, and the input shaft 18 of the boring device 16 is rotated accordingly. To do. When the input shaft 18 rotates, the case 17, the moving member 31, and the boring tool 39 rotate together.

Next, the solenoid valve 53 is operated by the control operation of the control means 50, and the B position is switched. When the solenoid valve 53 is switched to the B position, the air supplied from the air supply source 56 reaches the inlet 53a from the inlet 53a and flows into the front chamber 45a of the cylinder 45 through the air supply conduit 51. This causes the piston 46 to start moving rearward. On the other hand, the air in the rear chamber 45b of the cylinder 45 reaches the inlet / outlet 53b of the electromagnetic valve 53 through the air supply conduit 52, the throttle valve 54, and is discharged to the outside through the outlet 53d. At this time, the air flowing through the air supply pipe line 52 passes through the throttle valve 54, so that the flow rate thereof is controlled by the throttle valve 54 and becomes small. Therefore, the piston 46 of the cylinder 45 is gradually retracted.

As described above, when the piston 46 of the cylinder 45 moves backward, the engaging member 49 pulls the bearing 21 back, so that the rack gear 28 moves backward and the pinion gear 30 rotates in the E direction. And this pinion gear 3
The moving member 31 moves forward by the rack gear 36 that meshes with 0, and the boring tool 39 moves forward accordingly and the work 43 is cut. Boring tool 39 at this time
As described above, the forward movement of the
Is gradually carried out as it moves gradually.

After that, when the piston 46 of the cylinder 45 moves to the rearmost portion and the machining of the work 43 by the boring tool 39 is completed, the rear LS 5 is operated by the LS operation portion 48 a of the rear rod 48.
8 is turned on. As a result, the end of machining is detected, and the solenoid valve 53 is switched from the B position to the C position by the control operation of the control means 50. When the electromagnetic valve 53 is switched to the C position, the air supplied from the air supply source 56 reaches the inlet 53a and the outlet 53b, passes through the air supply pipe 52, and passes through the check valve 55 and the throttle valve 54 to the cylinder 45. Flows into the rear chamber 45b. This causes the piston 46 to start moving forward. On the other hand, cylinder 4
The air in the front chamber 45a of No. 5 reaches the inlet / outlet 53c of the solenoid valve 53 through the air supply conduit 51 and is discharged to the outside through the outlet 53d. At this time, the front chamber 45 of the cylinder 45
Since a is directly connected to the discharge port 53d by the air supply pipe line 51, the air in the front chamber 45a is quickly discharged to the outside, and the piston 46 moves quickly.

As described above, as the piston 46 of the cylinder 45 moves forward, the engaging member 49 moves forward, so the tool return spring 2
The moving member 31 is pushed back by the urging force of 5, and the boring tool 39 retracts. Boring tool 3 at this time
The reverse speed of 9 is increased by the quick movement of the piston 46 of the cylinder 45.

Then, when the piston 46 of the cylinder 45 moves to the frontmost portion, the front LS5 is moved by the LS operating portion 48a of the rear rod 48.
7 is turned on. As a result, the solenoid valve 53 is switched from the C position to the A position by the control operation of the control means 50, and the state of the cylinder 45 as described above is maintained.

In the above embodiment, the tip portion 18 of the input shaft 18 is
Although the example in which a is internally fitted in the case 17 has been described, the input shaft 18 may be integrally provided on the rear end side of the case 17. Further, although the boring tool 39 has been described as having a configuration in which it can be attached to and detached from the moving member 31, the boring tool 39 may be formed integrally with the moving member 31.

[Modification] A modification of the present invention will be described below with reference to FIG.
The members having the same functions as those in the above embodiment are designated by the same reference numerals.

In the boring device 61 shown in FIG. 4, the moving member 31, that is, the boring tool 39 is directly driven by hydraulic pressure in the front-rear direction.

That is, in the figure, the boring device 61 has an inner case 63 connected to the input shaft 18 by a bolt 62. Bearings 64.6 are provided on the outer periphery of the inner case 63.
4 and O-rings 65 and the like, an outer case 66 is provided, and one end of the outer case 66 has an outer case 6
The rotation stopping member 67, which is provided on the outer circumference of the shaft 6 and has the other end fixed to the spindle head 12 side, prevents co-rotation with the inner case 63.

Further, the outer case 66 is formed with oil feed passages 68 and 69 penetrating the peripheral wall of the outer case 66.
8 and 69 respectively communicate with corresponding annular grooves 70 and 71 formed on the inner peripheral surface of the outer case 66, and further the respective annular grooves 70 and 71.
71 communicates with the corresponding oil supply passages 72, 73 formed by penetrating the peripheral wall of the inner case 63. The above-mentioned one oil supply passage 72 is provided in the inner case 63.
4 communicates with a front chamber 75 formed in front of the piston 4, and the other oil feed passage 73 communicates with a rear chamber 76 formed behind the piston 74. A boring tool 39 is attached to the front end of the piston rod 77.

With such a configuration, the rotating boring tool 39 can be moved forward by sending the oil from the oil supply passage 69 to the rear chamber 76, and the boring can be performed by sending the oil from the oil supply passage 68 to the front chamber 75. The tool 39 can be retracted.

Further, according to the above configuration, the boring tool 39
The driving force transmission mechanism that moves the
It is possible to reduce the size and weight of the boring device 61.

[Effect of device]

As described above, the boring machine for a machining center according to the present invention includes a casing member that is taken out from a tool magazine of the machining center and mounted on the spindle of the machining center, and the rotational power from the spindle is input to the casing member. And a boring tool provided at the front end of the moving member, which is rotatably mounted integrally with the casing member, and externally fitted to the casing member so as to be movable back and forth, and the moving member inside. A connecting member having an inner body that engages with, and an outer body that can rotate relative to the inner body on the outside, and the casing member is mounted on the main shaft of the machining center and is in the processing position,
The outer body is engaged with a drive body that moves in the front-rear direction in a drive unit provided on the spindle head side of the machining center, and the moving member moves in the front-rear direction.

As described above, the driving means for moving the boring tool in the front-rear direction is provided on the spindle head side of the machining center, and the boring device is fitted with a connecting member having an inner body and an outer body which can rotate relative to each other so as to be movable back and forth. By,
The boring tool can be rotated and moved in the front-rear direction only by providing a mechanism for engaging the moving member of the inner body of the connection member in the front-rear direction in the casing member. Therefore, as compared with a configuration in which a driving force transmission mechanism for decelerating the rotational driving force and converting the rotational driving force into movement in the front-rear direction is incorporated, the mechanism incorporated in the boring device itself can be greatly simplified. As a result, the structure can be made smaller and the weight can be reduced. As a result, it becomes possible to equip the machining center as well as a normal tool such as a drill or a reamer, and it becomes possible to perform boring processing with good processing accuracy. Produce an effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 is an overall configuration diagram of a boring device, and FIG. 2 is a mounting of the boring device on a machining center. FIG. 3 is a side view showing the state, FIG. 3 is a rear view of the tool magazine seen from the direction II-II of FIG. 2, and FIG. 4 is a partial sectional view of a boring device showing a modified example of the present invention. 1 is a machining center, 4 is a tool magazine, 12 is a spindle head, 12a is a spindle, 16 is a boring device, 17 is a case (casing member), 18 is an input shaft, 20 is a cylindrical member, 21 is a bearing (connecting portion), 21a. Is an inner ring portion (inner body), 21b is an outer ring portion (outer body), 28 is a rack gear, 3
Reference numeral 0 is a pinion gear, 31 is a moving member, 36 is a rack gear, 39 is a boring tool, 41 is a tip, 44 is a tool advancing / retreating drive device (driving means), 45 is a cylinder, and 49 is an engaging member (driving body).

Claims (1)

[Scope of utility model registration request] 1. A casing member which is taken out from a tool magazine of a machining center and mounted on a spindle of a machining center and into which rotational power is input from the spindle, and a casing member which can be moved back and forth in the casing member and is formed integrally with the casing member. A movable member rotatably mounted, a boring tool provided at a front end portion of the movable member, and an inner body that is externally fitted to the casing member so as to be movable back and forth and engages with the movable member inside. And a connecting member having an outer body that is rotatable relative to the inner body on the outside, and the casing body is mounted on the spindle of the machining center and is in the processing position, the outer body is on the spindle head side of the machining center. A movable member provided in a driving means provided in the front-rear direction is engaged with the upper moving member to move in the front-rear direction. Boring equipment for thinning centers.