JPH078089Y2 - Chamfering machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a portable chamfering machine capable of chamfering an outer peripheral edge of a workpiece and chamfering an inner peripheral edge such as a hole or a groove. It is about.

[Prior art]

As a well-known portable chamfering machine that chamfers the ridge line part of a work material with a rotary cutting tool having a cutting edge on the outer periphery, an orthogonal guide surface applied to the corner part of the work material is attached to the main body with the rotary cutting tool at the tip. An example is a structure having a guide that obliquely exposes the cutting blade of the rotary blade from the angled portion of the guide surface. In this chamfering machine, the orthogonal guide surface of the guide is applied to the ridgeline portion of the work material, and in this state, the chamfering machine is chamfered while moving along the ridgeline.

[Problems to be solved by the invention] However, in the conventional portable chamfering machine, when chamfering the inner peripheral edge of the hole, the orthogonal guide surface provided near the cutting blade interferes with the work, Since the chamfering machine could not be moved smoothly along the inner circumference of, the chamfering could not be performed efficiently.

Therefore, the applicant of the present invention, in Japanese Utility Model Laid-Open No. 2-35614, provided a guide base at one end of a housing containing a motor,
The chamfering cutting blade is fixed to the rotary shaft protruding from the guide base so that it can be seen through the guide base, and a guide that can come into contact with the side surface of the workpiece at a position further ahead than the cutting blade. Proposed chamfering machine provided.
This chamfering machine exposes a guide along with the cutting blade to the side surface of the hole or curved surface of the work piece, contacts the guide base with the flat surface part of the work material, and applies the guide to the inner peripheral surface of the hole or the curved surface part. The chamfering machine is moved, and a hole or a ridge line portion of a curved surface is cut by a rotating cutting blade to perform a predetermined chamfering.

However, this chamfering machine solves the problem of improving the efficiency of the chamfering work, but lacks consideration for making it possible to easily adjust the chamfering amount and to easily replace the cutting edge. There was a problem.

The object of the present invention is not only to facilitate the chamfering of the outer peripheral edge of the workpiece and the chamfering of the inner peripheral edge such as a hole or groove, but also to easily adjust the chamfering amount. Another object of the present invention is to provide a portable chamfering machine that can be easily replaced with a different mechanism and that can easily replace the cutting blade.

[Means for solving problems]

In order to solve the above-mentioned problems, the chamfering machine of the present invention is provided with a chamfering cutting blade and an outer peripheral edge portion of a workpiece, a hole, a groove, or the like at the tip of a rotary shaft protruding from one end of a casing. A guide along the periphery is installed, and an annular connector is provided by exposing the cutting blade on the outer peripheral portion of the rotating shaft,
A guide groove is formed on the outer peripheral surface of the connector so as to intersect the axis, and an annular boss is fitted on the outer peripheral of the connector so that the annular boss is orthogonal to the rotary shaft. Then, fix the guide plate along the work piece, and further insert the sphere into the peripheral side of the annular boss so that it can be retracted and retracted in the centrifuging direction, and the sphere can be rolled in the guide groove. The lock ring formed on the inner peripheral portion of the lock boss is fitted to the outer peripheral portion of the annular boss portion, and has an inclined surface for pressing and restraining the spherical body in the centripetal direction when moved in the axial direction of the rotating shaft. The mating structure is adopted.

[Action]

When adjusting the chamfering amount, first, the screw fitting of the lock ring is loosened, and the ring is moved downward in FIG. 1 to release the pressing force of the spherical body that is in contact with the inner peripheral inclined surface. Next, when the guide base is rotated around the rotation axis, the spherical body projecting from the inner peripheral surface of the annular boss is guided by the guide groove that obliquely intersects the axis of the rotation axis. The guide plate can be moved up and down. When the guide plate is moved in this manner, the amount of protrusion of the chamfering cutting blade protruding from the lower surface of the plate gradually changes. When the amount of protrusion of the cutting blade reaches an amount corresponding to the desired chamfering amount, the screwing of the locking ring is strengthened again, and the spherical body is pressed and restrained in the centripetal direction by the inner peripheral inclined surface of the ring, and the annular boss is pressed. Strengthen the connection between the section and the annular connector.

When chamfering, make sure that the cutting blade faces the outer peripheral edge of the work material or the inner peripheral edge of the work material such as holes and grooves, and that the guide faces the side surface and inner peripheral surface. , Apply the guide plate to the flat surface of the work material. By rotating the rotary shaft in this state and moving the chamfering machine along the side surface of the workpiece, the ridgeline of the workpiece is obliquely cut by the cutting blade, and a desired amount of chamfering is performed.

When replacing the cutting blade, with the lock ring loosened as in the chamfering amount adjustment work, rotate the guide base to disengage the spherical body of the annular boss from the guide groove of the annular connector. The part and the annular connector are separated, and the screw is loosened and replaced while the cutting blade is completely exposed to the outside.

〔Example〕

In the chamfering machine of this embodiment, for example, an air motor 3 is built in a casing 1 having a substantially L shape as a drive source. The air motor 3 has a structure in which a rotor 7 radially provided with a plurality of blades 5 that are elastically urged in a centrifugal direction during rotation is rotatably provided in a cylinder 9. Reference numeral 7 denotes a function of expanding the space surrounded by the blade 5 and the inner peripheral surface of the cylinder 9 with compressed air supplied through the air supply port 11, and at that time, air in another space is directed to the exhaust port 13. Air is supplied to the air motor 3 by repeating the exhausting mechanism, and the air supplied to the air motor 3 is the air supply hose 15 connected to the rear end of the casing 1 and the compressed air entering the casing 1 by the air supply hose 15. The air is supplied to the air supply port 11 via an air supply valve 19 that is opened and closed by operating a lever 17, and an air supply circuit 21 connected to the air supply hose 15 via the air supply valve 19. Exhaust gas from the air motor 3 is guided from the exhaust port 13 to the exhaust hose 25 through the exhaust circuit 23. The air supply hole 15 and the exhaust hose 25 are provided substantially coaxially, and a sponge 26 also serving as a silencer is spirally wound around the exhaust hose 15.

The motor shaft 27 of the air motor 3 is integral with the rotor 7 and is rotatably supported by the casing 1 through a pair of ball bearings 29 and 31, and is rotated by the motor shaft 27 protruding from the lower end of the casing 1. The shaft 33 is coaxially screw-fitted and fixed. The annular connector 35 is fixed to the lower end of the casing 1 so that the axis of the rotary shaft 33 coincides with that of the rotary shaft 33. On the outer peripheral surface of the annular connector 35, as shown in FIGS. 2 and 3, three guide grooves 37 of the same length are formed at equal intervals so as to project obliquely with respect to the axis. . Each guide groove
As for the positional relationship between both end portions 37a and 37b of the 37, a distance S is set in the axial direction as shown in FIG. 3, and the protrusion amount of the chamfering cutting blade 49 described below can be adjusted by the distance S. It is like this. In addition, 39 is an auxiliary guide groove 39 extending to the groove end portion 37a for guiding the sphere 45 described below into the guide groove 37.

An annular fitting portion 47A formed at one end of the annular boss portion 47 of the guide plate 43 placed on the surface of the workpiece 41 is loosely fitted to the outer peripheral surface portion of the annular connector 35, and this fitting portion 47A Has three conical trapezoidal through-holes 47B for holding the spherical body 45 in a retractable manner from the front and back sides thereof. The spherical body 45 of the through-hole 47B is formed in the guide groove 37 of the annular connector 35. They are fitted together. Further, a male screw 47C is formed on the outer peripheral surface of the lower end of the annular boss portion 47, and the male screw 47C presses the spherical body 45 in the centripetal direction, and also an inclined surface 61 that allows the spherical body to move in the centrifugal direction. A lock ring 55 formed in the circumferential direction is screw-fitted. 57 is a female screw that is joined to the male screw 47C. Reference numeral 59 in the figure is a stopper of the lock ring 55.

The rotary shaft 33 passes through the center of the annular boss portion 47 and projects to the bottom surface side of the guide plate 43. In this projection portion, a square cutting tip 49 having cutting blades 49A on four sides is provided on one side of the tip 49. So that it faces the bottom surface of the guide plate 43 at an angle of, for example, 45 °, part of the bottom surface of the guide plate 43 can be seen, the screw 51 can be attached and detached, and the mounting angle (chamfering angle) can be adjusted. Fix it freely. Above rotary shaft
A guide bearing 53, which is rotatable in contact with the side surface of the workpiece 41, is fixed to the tip of 33 by a nut 54 like a cap nut.

The chamfering amount C of the cutting tip 49 by the cutting blade 49A is the point where the cutting blade 49A intersects the bottom surface of the guide plate 43 when the cutting tip 49 faces the front as shown in FIG. The size corresponds to the horizontal distance from the outer peripheral surface of the guide bearing 53. Therefore, in the state where the restraint of the spherical body 45 by the lock ring 55 is released, the annular boss portion is
When the guide plate 43 is rotated together with the guide plate 43 and the guide plate 43 is moved in the axial direction of the rotary shaft 33, the cutting blade
It is possible to adjust the amount by which 49 is viewed below the guide plate 43, and the chamfering amount can be adjusted.
When the annular boss 47 is separated from the annular connector 35 with the sphere 45 completely removed from the guide groove 37, the cutting tip
49 can be completely exposed outside the plane.

Next, the operation of the above embodiment will be described.

First, in the case of adjusting the chamfering amount, the screw fitting of the lock ring 55 is loosened to move the inclined surface 61 downward, and the spherical body of the annular boss portion 47 fitted in the guide groove 37 of the annular connector 35. Release the pressing force of 45 on the centripetal direction. Therefore, the annular boss portion 47, which is fitted into the annular connector 35 via the guide groove 37 and the spherical body 45, is rotated together with the guide plate 43, and the protruding amount of the cutting blade 49A is partially seen from the lower surface of the guide plate 43. Is adjusted so that the required chamfering amount C can be obtained. After that, tighten the lock ring 55 and
The spherical surface 45 of the annular boss portion 47 is firmly pressed in the centripetal direction by the inclined surface 61.

After adjusting the chamfering amount in this way, for example, when chamfering the inner peripheral edge of the hole 41A of the workpiece 41, the air motor 3 is started to rotate the rotary shaft 33, and in this state The bottom surface of the guide plate 43 is placed on the surface of the workpiece 41 so that the tip of the rotary shaft 33 protruding from the bottom surface of the plate 43 is inserted into the hole 41A. After finishing the preparation in this way, when the chamfering machine is moved while pressing the outer peripheral portion of the guide bearing 53 against the inner surface of the hole 41A, the guide bearing 53 follows the shape of the inner peripheral surface of the hole 41A. And the cutting blade 49A fixed to the rotary shaft 33 is guided in the hole 4
Chamfer the ridge of 1A. Also, when chamfering the outer peripheral edge portion or the ridge portion of the curved surface of the work material, similarly to the above, by moving the guide bearing 53 along the side surface shape of the work material, the guide bearing 53 and the rotary shaft are rotated together. 33
The cutting blade 49A fixed to the cutting edge cuts the ridge line portion 41B of the workpiece 41 to perform the required chamfering.

When replacing the cutting blade, in the same manner as the chamfering amount adjustment work, with the lock ring 55 loosened, the annular boss portion 47 is rotated together with the guide base 43 so that the spherical body 45 passes through the guide groove 37 and the auxiliary guide groove 39. The annular boss 47 is separated from the annular connector 35 to separate the annular boss portion 47 from the annular connector 35, and the cutting blade is completely exposed to the outside. In this state, the screw 51 is loosened to replace the cutting tip 49 with another tip, or the cutting tip 49 is rotated to bring the unused cutting blade to the working position.

Although the embodiments have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.

For example, the power transmission system for rotationally driving the cutter may be one that is not directly connected to the motor shaft but is transmitted via a reduction gear, and the rotational drive source is not an air motor but a hydraulic motor or an electric motor. It may be a motor. Further, the guide bearing can be changed to a ring or plate that does not rotate, and the guide may be formed directly on the rotating shaft itself, but the distance from the axis of the rotating shaft to the surface of the guide (in the embodiment, the guide is not used). The radius of the bearing) is determined in consideration of the chamfering amount, and the guide is always brought into contact with the side surface of the workpiece during the chamfering work. The auxiliary guide groove 39 of the annular connector 35 may not be provided.

[Effect of device]

The chamfering machine of the present invention makes a chamfering machine that follows the shape of the workpiece by contacting the guide located at the tip of the cutting blade protruding from the bottom side of the guide base with the inner surface or the outer surface of the workpiece. Since it is possible to guide and chamfering with a cutting blade, it is easy to chamfer the inner peripheral edge of the hole and the peripheral edge of the curved surface, which was impossible with the conventional portable chamfering machine. You can

In addition, since the annular boss that is integral with the guide plate is fitted to the outer peripheral surface of the annular connector for fixing the guide plate to allow the guide plate to move in the axial direction of the rotary shaft, it is provided at the tip of the rotary shaft. The amount of protrusion of the cutting blade can be easily adjusted, and the spherical body that supports the annular boss can be restrained and released by operating the lock ring, which makes it easier to tighten and loosen the guide plate. Therefore, there is an effect that the operability of adjusting the chamfering amount is significantly improved. Moreover, the structure is extremely simple, and since the annular boss portion, the annular connector, and the lock ring are fitted concentrically and sequentially, unlike the one in which the chamfer adjustment mechanism extends in the axial direction of the rotating shaft, the height Since the rotating shaft can be shortened, the bending moment acting on the rotating shaft can be reduced, and vibration and noise during chamfering work can be suppressed to a low level.

In addition, when exchanging the cutting blade, if the lock ring is loosened and the guide base is removed as in the chamfering amount adjusting operation, the cutting blade can be easily exchanged regardless of its shape.

[Brief description of drawings]

The drawing shows one embodiment of the chamfering machine according to the present invention,
Fig. 1 is a vertical sectional front view of the chamfering machine, and Fig. 2 is II- in Fig. 1.
FIG. 3 is a cross-sectional plan view taken along line II, and FIG. 3 is a front view of the annular connector. 1 ... Casing, 3 ... Air motor, 33 ... Rotating shaft, 35 ... Annular connector, 37 ... Guide groove, 39 ... Auxiliary guide groove, 41 ... Work piece, 43 ... Guide plate, 45 ......
Sphere, 49 ... Cutting tip, 49A ... Cutting blade, 53 ... Guide bearing, 55 ... Lock ring, 57 ... Split groove.

Claims (1)

[Scope of utility model registration request] 1. A chamfering cutting blade and an outer peripheral edge portion of a workpiece, and a tip end portion of a rotating shaft protruding from one end portion of a casing,
While installing a guide along the inner peripheral edge of holes and grooves,
An annular connector is provided by exposing the cutting blade on the outer peripheral portion of the rotary shaft, and a guide groove is formed on the outer peripheral surface portion of the connector so as to intersect the axis center line. , The annular boss portion is fitted, and a guide plate is provided on the annular boss portion so as to be orthogonal to the rotation axis and along the workpiece, and a spherical body is obtained on the peripheral side portion of the annular boss portion. The spherical body is fitted in the centrifugal groove in a retractable manner, the spherical body is rotatably fitted in the guide groove, and the outer peripheral portion of the annular boss portion is moved in the axial direction of the rotary shaft. A chamfering machine in which a lock ring formed on the inner peripheral portion is screw-fitted to an inclined surface that presses and restrains the centering direction.