JP3510097B2 - Swing spindle device for machine tools - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a oscillating spindle device for a machine tool, and more particularly, to a oscillating collar provided with a working tool, and a rotating shaft that rotates at high speed. The present invention relates to a swing spindle device rotatably supported on an eccentric shaft portion of the present invention. Conventionally, various processing tools such as reamers, drills, milling tools, whetstones, brushes, and buffs have been used by being mounted on a spindle of a machine tool. The rotating processing tool is always operated on the workpiece for processing. As a prior example relating to the present invention, Japanese Patent Laid-Open No.
-226609. [0004] In a configuration in which a work tool is constantly operated on a work to perform the work, the work and the work tool generate heat and become high temperature, thereby shortening the tool life and causing the work to be heated by the high temperature. May have adverse effects. In the prior art, two motors, one for high speed and one for low speed, are used, and there is a problem that the configuration is complicated. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a structure in which a tip of a rotating shaft rotatably supported by a holder main body is provided at an end of the rotating shaft. An eccentric shaft portion that is minutely eccentric with respect to the center is provided, and a chuck device that is capable of detachably replacing a processing tool is provided on an oscillating collar rotatably supported by the eccentric shaft portion, and the rotation direction of the rotating shaft and the the rotational speed of the rotary shaft than the rotational speed of the <br/> swing collar as well as the direction of rotation of the dynamic color reverse rotation direction to the high speed, before a drive shaft which is rotated by a motor
The rotating shaft is linked to the rotating shaft via a speed increasing mechanism.
The rotation direction of the oscillating collar with respect to the rotation direction of the rotation shaft
The pulley of the reduction mechanism to reverse the
The pulley and the drive are rotatably supported and provided.
A shaft and an interlocking mechanism, and the pulley and the swing
With the universal joint interposed between the collar and the tip of the rotating shaft
From the side, the swing collar, the universal joint, and the pulley
This is a configuration in which they are sequentially arranged. Referring to FIG. 1, an oscillating spindle device 1 according to an embodiment of the present invention includes a holder main body 3, and a plurality of bearings 5 are provided on the holder main body 3. The rotating shaft 7 is rotatably supported via the. This rotating shaft 7
Is appropriately linked to a drive motor (not shown),
An eccentric shaft portion 7 </ b> E (see FIG. 2) in which the shaft center is slightly eccentric with respect to the axis of the rotating shaft 7 is provided at the tip end side of the rotating shaft 7. An oscillating collar 11 is rotatably supported on the eccentric shaft portion 7E of the rotating shaft 7 via a plurality of bearings 9. The oscillating collar 11 includes, for example, a grindstone, a brush, a cutting tool, and the like. A chuck device 13 is provided, which is capable of detachably replacing an appropriate processing tool (not shown) such as the above. Since the chuck device 13 may be a known chuck such as a collet chuck, a detailed description of the configuration of the chuck device 13 is omitted. In order to rotate the rotating shaft 7 and the oscillating collar 11 by a single motor, the holder body 3 is provided with a driving shaft 15 rotatably driven by a motor (not shown). The drive shaft 15 has first and second
Drive pulleys 17 and 19 are integrally mounted. In this example, the first and second drive pulleys 17 and 19 are shown to have the same diameter, but the first drive pulley 17 may be larger in diameter than the second drive pulley 19. A small-diameter pulley 21 is integrally attached to the rotary shaft 7 in correspondence with the first driving pulley 17, and a first belt 23 is attached to the small-diameter pulley 21 and the first driving pulley 17. Is hanging around. Therefore, the rotating shaft 7
Is linked to the drive shaft 15 via a speed increasing mechanism including the first drive pulley 17 and the small-diameter pulley 21 and the like.
Thus, the rotation speed is increased and the rotation speed is increased as compared with the rotation of the drive shaft 15. A large-diameter pulley 27 is rotatably supported on the rotary shaft 7 via a plurality of bearings 25 in correspondence with the second drive pulley 19.
A second belt 29 is wound around the drive pulley 19. The rotation of the pulley 27 is controlled by the swing collar 1.
A universal joint 31 is interposed between the pulley 27 and the oscillating collar 11 for transmitting the force to the pulley 1. The large-diameter pulley 27 has a larger diameter than the small-diameter pulley 21, but may have a diameter substantially equal to or larger than that of the drive pulley 19.
In this case, the pulley 19, 27 is Ri Do to constitute a kind of reduction mechanism, the swing collar 11, the swing collar
Universal joint 3 interposed between pulley 11 and pulley 27
1 and a structure interlocked with the drive shaft 15 via a speed reduction mechanism
2, as shown in FIG.
The swing collar 11, the universal joint 31, the pulley
27 are sequentially arranged. With the above configuration, the motor is driven and the first and first motors are driven.
When the second drive pulleys 17 and 19 are rotated, the first and second drive pulleys 17 and 19 are rotated.
The rotating shaft 7 and the pulley 27 are rotated via the belts 23 and 29, and the swing collar 11 via the universal joint 31.
Is rotated. At this time, the rotating shaft 7 is accelerated through the speed increasing mechanism and rotates at high speed. In this example, the rotating shaft 7
The first and second belts 23 and 29 are arranged so that the rotation direction of the pulley 27 and the swing collar 11 is opposite to the rotation direction of the first and second belts.
One of the belts is appropriately wound around an "8" shape. The universal joint 31 is, as shown in FIG.
A first ring 33 integrally fixed to the swing collar 11 via a suitable fixing tool such as a bolt, a second ring 35 fixed to the pulley 27 side, and first and second rings It consists of a floating ring 37 interposed between 33 and 35. The first ring 33 has a projection 33P such as a radial key, and the second ring 35
Has a protrusion 35P such as a key or the like, the phase of which is shifted in a direction orthogonal to the protrusion 33P of the first ring 33. On the front and back surfaces of the floating ring 37, the protrusions 33P of the first and second rings 33 and 35 are provided.
A groove 37G slidably engaging with 35P is formed out of phase in a direction perpendicular to the groove. Further, an appropriate number of oil grooves 39 are formed in an arc shape on both front and back surfaces of the floating ring 37. In the above configuration, when the drive shaft 15 is driven to rotate by the motor, the rotation of the drive shaft 15 is controlled by the pulleys 17, 19, the belts 23, 29 and the pulleys 21,
The rotation is transmitted to the rotation shaft 7 and the swing collar 11 through the rotation shaft 27. At this time, since one of the belts is twisted in an “8” shape, the swing collar 11 rotates in the reverse direction with respect to the rotation shaft 7. The rotation of the drive shaft 15 is controlled by the pulley 17, the belt 23
And the speed is transmitted to the rotating shaft 7 via the pulley 21. Accordingly, when the drive shaft 15 is driven to rotate as described above, the swing collar 11 is rotated at a constant speed or at a reduced speed with respect to the drive shaft 15 and the rotating shaft 7 is moved in the opposite direction with respect to the swing collar 11. Since the rotating collar 11 is rotated at a high speed, the swinging collar 11 rotatably supported by the eccentric shaft portion 7E of the rotating shaft 7 includes:
The oscillating collar 11 is eccentrically rotated (eccentrically oscillated) with a small radius in a direction opposite to the rotation direction due to the rotation of the oscillating collar 11. Accordingly, the processing tool attached to the chuck device 13 rotates in the rotation direction of the swing collar 11 and revolves (eccentric rotation of a minute radius) in a direction opposite to the rotation direction to form a work (not shown). Processing will be performed. Attention is paid to the working point P when the working tool performs an appropriate working such as cutting, grinding, polishing or the like on the work. As shown in FIG.
With respect to the rotation of the working tool in the direction of arrow A, eccentric swinging is performed with a small radius R in the direction of arrow B. When the machining tool rotates in the direction of arrow A to machine the workpiece, when the machining point P moves from P1 to P2 to P3 due to eccentric oscillation, it separates from the workpiece, and when it moves from P3 to P4 to P1, In this mode, the workpiece is cut. Therefore, the working point of the working tool intermittently acts on the workpiece to perform the working. In practice, the point P moves in the circumferential direction by the rotation of the machining tool in the direction of arrow A, so that P3 →
The position P1 when moving from P4 to P1 is the initial position P
Although the position is shifted from the position 1 in the direction of arrow A, it is described that the position returns to the initial position for convenience. As can be understood from the above description, the rotational direction of the working tool (direction of arrow A) and the eccentric oscillating (eccentric rotation) direction of the working tool (direction of arrow B) are opposite to each other. Compared to the case where the eccentric rotation direction is the same as the eccentric rotation direction, the action of the working point P of the working tool cutting into the work is weakened, and light working is performed. Therefore, ing to being able to more effectively suppress the heat generation at the time of processing. Further, the machining tool intermittently oscillates at a minute radius R, thereby intermittently making a minute amount of cut into the work, and suspends the work when moving away from the work by a minute amount. Since heat is dissipated, the heating of the processing tool and the work can be effectively suppressed. Therefore, it is easy to extend the life of the working tool, and it is also possible to effectively prevent adverse effects such as burning of the work due to cutting heat. In the above description, the rotation of the drive shaft 15 is transmitted to the rotation shaft 7 and the oscillating collar 11 via the belt transmission mechanism, but a gear train is used as the power transmission mechanism. You can also. As will be understood from the above description , according to the present invention , it is possible to effectively prevent a workpiece and a processing tool from being heated to a high temperature due to heat during processing. It is easy to extend the life of the tool, and it is possible to prevent the work from being adversely affected by heat generated during processing. Further, since the rotating direction of the rotating shaft and the rotating direction of the oscillating collar are configured in opposite directions, the incision of the working point of the working tool with respect to the work as compared with the case of the same direction. Is suppressed and light processing is performed.
Ru der which heating can be further suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory sectional view of a swing spindle device according to an embodiment of the present invention. FIG. 2 is an enlarged sectional explanatory view of a main part in FIG. FIG. 3 is a perspective view of a universal joint part. FIG. 4 is an explanatory diagram of an intermittent cutting action in a rotary cutting tool. [Description of Signs] 1 Swing spindle device 3 Holder body 7 Rotary shaft 11 Swing collar 13 Chuck devices 17, 19, 21, 27 Pulley 23, 29 Belt 31 Universal joint

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23Q 5/04 B24B 47/10-47/12

Claims (1)

(1 ) An end portion of a rotating shaft (7) rotatably supported by a holder body (3) is provided with a small amount with respect to the axis of the rotating shaft (7). An eccentric shaft portion (7E) is provided, and the oscillating collar (1 ) rotatably supported by the eccentric shaft portion (7E).
1) A chuck device (13) that allows detachable and exchangeable processing tools
And the direction of rotation of the rotating shaft (7) and the swing collar
Wherein the rotary shaft than the rotational speed of the swing collar (11) the rotational speed of (7) to a high speed, is rotated by the motor with a reverse rotation direction to the rotation direction (11)
The drive shaft (15) and the rotary shaft (7) are connected via a speed increasing mechanism.
Provided in an interlocked configuration, in the direction of rotation of the rotary shaft (7).
On the other hand, the rotation direction of the swing collar (11) is set to the opposite direction.
Pulley (27) of the reduction mechanism for the rotation shaft (7)
The pulley (27) is provided so as to be rotatably supported on the pulley (27).
And the drive shaft (15) are provided in an interlocked configuration, and
Between the pulley (27) and the swing collar (11).
A tip of the rotating shaft (2) via a joint (31)
From the side, the swing collar (11) and the universal joint (3
1) A swing spindle device for a machine tool , wherein the pulleys (27) are sequentially arranged .