JP3445078B2 - 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 universal joint between an output shaft provided with a working tool and an input shaft. The present invention relates to an oscillating spindle device having a configuration in which the output shaft is eccentrically oscillated by increasing the rotation of the input shaft while being provided in an interlocking connection with the input shaft. Conventionally, various processing tools such as a reamer, a drill, a milling tool, a grindstone, a brush, and a buff have been used by being mounted on a spindle of a machine tool. The rotating processing tool is operated by constantly acting on the work. As a prior example of 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 to a high temperature, thereby shortening the tool life and causing the work to be exposed to 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 been made in consideration of the problems described above. The present invention relates to an axis of an input shaft rotatably supported by a holder main body and the holder main body. The axis of the eccentric hole of the eccentric collar rotatably supported by the eccentric collar is provided with a small amount of eccentricity, and the output shaft and the input shaft rotatably supported by the eccentric hole of the eccentric collar are interlocked via a universal joint. A coupling device is provided, and a chuck device for detachably replacing a processing tool is provided on the output shaft, and an intermediate shaft rotatably supported by the holder body and the input shaft are interlocked via a first power transmission mechanism. The intermediate shaft and the eccentric collar are interlockingly connected via a second power transmission mechanism, and the speed increase mechanism is attached to at least one of the first power transmission mechanism and the second power transmission mechanism. Make up the previous The rotating direction of the input shaft and the rotating direction of the eccentric collar are configured in opposite directions so that the working point of the working tool cuts into the work is weakened. To separate and cut into
It is configured to perform processing by intermittently acting by repeating . Referring to FIG. 1, an oscillating spindle device 1 according to an embodiment of the present invention includes a holder body 3. The input shaft 7 is rotatably supported via the bearing 5. This input shaft 7
Is connected to the drive motor M as appropriate, and a pulley 9 is integrally attached to one end of the input shaft 7 via a key or a nut 11. A cylindrical housing 13 is integrally mounted on the holder body 3 via a plurality of bolts (not shown). An eccentric collar 17 is rotatable on the housing 13 via a plurality of bearings 15. It is supported by. The rotation axis of the eccentric collar 17 coincides with the axis of the input shaft 7, but the axis of the eccentric hole 17H provided in the eccentric collar 17 is slightly eccentric with respect to the axis of the input shaft 7. It is provided. Therefore, when the eccentric collar 17 is rotated, the axis of the eccentric collar 17 is eccentrically rotated (oscillated) with respect to the axis of the input shaft 7. The rotation of the input shaft 7 is controlled by the eccentric collar 17.
A power transmission mechanism for increasing the speed and transmitting the rotation in the opposite direction is provided. That is, an intermediate shaft 19 is rotatably supported on the holder body 3,
A belt 23 twisted in an “8” shape is wound around a pulley 21 attached to one end of the intermediate shaft 19 and the pulley 9 attached to the input shaft 7. Pulley 9, 21
The belt 23 constitutes a first power transmission mechanism 25 that transmits the rotation of the input shaft 7 to the intermediate shaft 19. In the first power transmission mechanism 25, the belt 23 is twisted to rotate the intermediate shaft 19 in the reverse direction with respect to the rotation of the input shaft 7, but it is interlocked via a gear train. It is also possible to use However, in terms of simplification of the configuration, it is desirable that the configuration be interlocked via the belt 23 as described above. The rotation of the intermediate shaft 19 is controlled by the eccentric collar 1.
For transmission to 7, the intermediate shaft 19 and the eccentric collar 17 are interlocked via a second power transmission mechanism 27. That is, a small-diameter pulley 29 is integrally attached to the eccentric collar 17, and a belt 33 is wound around the pulley 29 and the large-diameter pulley 31 attached to the other end of the intermediate shaft 19. . With the above configuration, the eccentric collar 17 is rotated at a high speed at a speed higher than the rotation of the input shaft 7.
Moreover, the rotation direction is opposite to the rotation direction of the input shaft 7. As already understood, since the first and second power transmission mechanisms 25 and 27 each have a configuration using a pulley and a belt, the speed-up rate of the eccentric collar 17 can be adjusted by an appropriate pulley,
For example, it can be easily changed by replacing the pulley 31 with a pulley having a different diameter. An output shaft 37 is rotatably supported in the eccentric hole 17H of the eccentric collar 17 via a plurality of bearings 35. A processing tool 39 is detachably mounted on the outer end of the output shaft 37 so as to be removable. A chuck device 41 such as a collet chuck is mounted. The inner end of the output shaft 37 is linked to the input shaft 7 via a universal joint 43. That is, a transmission plate 47 having a radial recess 45 is integrally attached to an end of the input shaft 7 and the output shaft 37, and the recess 45 is provided between the two transmission plates 47. A floating plate 51 provided with a roller 49 engaged with the plate is interposed. In the above configuration, the driving motor M
When the input shaft 7 is driven to rotate, the output shaft 37 is rotated in the same direction via the universal joint 43, and the processing tool 39 attached to the output shaft 37 is rotated. The rotation of the input shaft 7 is transmitted to the intermediate shaft 19 via the pulley 9, the belt 23 and the pulley 21. At this time, since the belt 23 is twisted in an “8” shape, the intermediate shaft 19 is connected to the input shaft 7.
Is rotated in reverse. The rotation of the intermediate shaft 19 is transmitted to the eccentric collar 17 at an increased speed via the pulley 31, the belt 33 and the pulley 29. Therefore, when the input shaft 7 is rotationally driven as described above, the output shaft 37 is rotated in the same direction at the same speed as the input shaft 7, and the eccentric collar 17 is rotated at a high speed in the opposite direction. 37 is eccentrically rotated (oscillated) in a direction opposite to the rotation direction of the output shaft 37 with a small radius. Therefore, the processing tool 39 attached to the output shaft 37 via the chuck device 41 rotates in the rotation direction of the input shaft 7 and revolves in the direction opposite to the rotation direction (eccentric rotation of a minute radius). Processing of a work (not shown) is performed. Attention is paid to a working point P when the working tool 39 performs an appropriate working such as cutting, grinding, polishing or the like on the work. As shown in FIG. Arrow B against rotation of arrow 39 in the direction of arrow A
The eccentric swing is performed with a small radius R in the direction.
When the processing tool 39 rotates in the direction of arrow A to process a workpiece, the processing action point P is eccentrically oscillated to P1 → P2 →
When moving with P3, it separates from the work and P3 → P4
→ When moving to P1, the work is cut into the work. Therefore, the machining action point of the machining tool 39 is repeated by separating from the workpiece and cutting.
In this case, the working is performed intermittently. Actually, the point P moves in the circumferential direction by the rotation of the machining tool 39 in the direction of the arrow A.
The position P1 when moving from 3 → P4 → P1 is a position displaced in the direction of arrow A from the initial position P1, but is described as returning to the initial position for convenience. As can be understood from the above description, the direction of rotation (direction of arrow A) of the processing tool 39 and the direction of eccentric swing (eccentric rotation) of the processing tool 39 (direction of arrow B) are opposite to each other. Compared to the case where the rotation direction and the eccentric rotation direction are the same direction, the action of the machining action point P of the machining tool 39 cutting into the work is weakened, and light machining is performed. Therefore, heat generation during processing can be effectively suppressed. The processing tool 39 is eccentrically oscillated with a small radius R to intermittently make a small amount of cuts into the work. Since the heat is released and the heat is released, the heating of the processing tool 39 and the work can be effectively suppressed. Therefore, it is easy to extend the life of the working tool 39, and it is also possible to effectively prevent adverse effects such as burning of the work due to cutting heat. As will be understood from the above description, the present invention is directed to an eccentric collar rotatably supported by the holder main body and an input shaft rotatably supported by the holder main body. The eccentric hole and the axis of the eccentric hole are provided eccentrically by a minute amount, and the output shaft rotatably supported by the eccentric hole of the eccentric collar and the input shaft are interlockingly connected via a universal joint, and the machining tool is provided. A detachable chuck device is provided on the output shaft, and an intermediate shaft rotatably supported by the holder main body and the input shaft are interlockedly connected via a first power transmission mechanism. The eccentric collar and the second eccentric collar are interlockingly connected via a second power transmission mechanism.
A speed-increasing mechanism is configured in at least one of the power transmission mechanism and the second power transmission mechanism, and the rotation direction of the input shaft is reduced so that the processing action point of the processing tool cuts into the work is weakened. And the rotation direction of the eccentric collar are opposite to each other, and the machining action point of the machining tool is separated from the workpiece.
It is configured to perform machining by intermittently acting by repeatedly performing cutting and cutting, so that the cutting action point of the machining tool with respect to the workpiece is As a result, the light processing is performed, and the heat generation can be further suppressed. Also it is possible to work and the machining tool is effectively prevented from becoming a high temperature by the heat at the time of processing, together with it is easy to achieve a prolonged life of the machining tool, adverse effect on the work by the heat during processing Can be prevented. Further, by using the first and second power transmission mechanisms using a pulley and a belt, the configuration can be simplified as compared with the case where a gear mechanism is employed. The operation and the like are facilitated and the production can be performed at low cost. [0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory cross-sectional view of a swing spindle device according to an embodiment of the present invention. FIG. 2 is a perspective view of a universal joint part. FIG. 3 is an explanatory view of an intermittent cutting action in a rotary cutting tool. [Description of Signs] 1 Oscillating spindle device 3 Holder main body 7 Input shaft 9, 21, 29, 31 Pulley 17 Eccentric collar 17H Eccentric hole 19 Intermediate shaft 23, 33 Belt 25 First power transmission mechanism 27 Second power transmission Mechanism 37 Output shaft 39 Working tool 43 Universal joint

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

Claims (1)

(57) Claims 1. An axis of an input shaft (7) rotatably supported by a holder body (3) and an eccentric collar rotatably supported by the holder body (3). Eccentric hole (17H) of (17)
Of the eccentric collar (1)
An output shaft (37) rotatably supported by the eccentric hole (17H) of (7) and the input shaft (7) are interlockingly connected via a universal joint (43), and a processing tool (39) is provided. The chuck device (41), which is detachable and replaceable, is connected to the output shaft (3).
7), an intermediate shaft (19) rotatably supported by the holder body (3) and the input shaft (7) are provided in an interlocking manner via a first power transmission mechanism (25). The intermediate shaft (19) and the eccentric collar (17) are interlockingly connected via a second power transmission mechanism (27), and are provided with the first power transmission mechanism (25) or the second power transmission mechanism. A speed increasing mechanism is configured in at least one of (27),
The direction of rotation of the input shaft (7) and the direction of rotation of the eccentric collar (17) are reversed so that the working point (P) of the working tool (39) cuts into the work weakly. The machining action point (P) of the machining tool (39) is repeatedly separated from the workpiece and cut.
A swing spindle device for a machine tool, wherein the swing spindle device is configured to perform machining by intermittently acting as described above.