JPH0357380Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a chamfering tool that can be used for chamfering and beveling workpieces, and in particular, it is a portable chamfering tool that is small and lightweight and convenient to carry. Regarding handling tools.

[Conventional technology]

A conventional chamfering tool has a structure as shown in FIGS. 6 and 7. That is, a cutter shaft 6, which is rotationally driven by a drive motor 4, is disposed within the chamfering tool body 2, with its tip, on which a cutting tip is attached, protruding in a direction perpendicular to the direction in which the body 2 extends. A head 8 is attached to the main body 2 so as to cover the tip of the cutter shaft 6, and a first reference plate 10 and a second reference plate 12 are fixed to the head 8 so as to be perpendicular to each other. There is.
Two mutually orthogonal surfaces 10A and 12A of these reference plates 10 and 12 come into contact with the workpiece 1 and constitute reference guide surfaces for positioning the chamfer. Reference numeral 14 denotes a gear mechanism consisting of a bevel gear for transmitting the rotational driving force of the drive motor to the cutter shaft 6. Reference numeral 16 designates a knob protruding from the head 8, which is used to grip the main body 2 with one hand and simultaneously grip the knob 16 with the other hand during chamfering work.

In the chamfering tool described above, the reference plates 10, 1
Since the orthogonal reference planes 10A and 12A of 2 are used as guides in contact with the workpiece 1, there is no problem if the chamfered part is a straight line, but if the chamfered part is a straight line, there is no problem, but if the chamfered part is straight, it may be difficult to There was a problem in that the plates 10 and 12 could not be used when chamfering or beveling a small inner R portion because they got in the way.

Therefore, the chamfering tool shown in Fig. 8 (Jet No. 62-7755)
No.) has been proposed. A chamfered plate c is attached to the outer periphery of the tip of a rotary shaft b whose base end is supported by a processing machine body a, and a guide plate d fixed to the processing machine body a is provided around the chamfered plate c. The rotating shaft b has a structure in which a guide roller e is provided at the tip of the rotating shaft b to cooperate with a guide plate d to set the amount of chamfering. The guide roller e is attached to the rotating shaft b via a support shaft f, or is attached at a distance from the rotating shaft b via a support arm g fixed to a guide plate d.

[Problem that the invention attempts to solve]

However, in the chamfering tool shown in FIG. 8 described above, chamfering is performed by moving the tool while keeping the guide roller e in contact with the workpiece, so when the guide roller e is attached to the rotating shaft b, the rotating shaft b A supporting shaft f is required to ensure relative rotation with the rotating shaft b. On the other hand, when the guide roller e is mounted separately from the rotating shaft b, a supporting arm g fixed to the guide plate d is essential. However, the structure in which the guide roller e is supported by the support arm g is not preferable because the support arm g interferes with chamfering in all directions, and the orientation of the chamfering tool with respect to the chamfering area is restricted. Further, in the structure in which the guide roller e is attached to the rotating shaft b, the supporting shaft f is essential, and the structure of the guide portion becomes that much more complicated. Until the guide roller e comes into contact with the workpiece and comes to rest,
The guide roller e also rotates at high speed together with the rotating shaft b, and there is a problem in that the workpiece is damaged by the rotational torque due to the inertia of the guide roller e.

The present invention was developed in view of the problems of the prior art described above, and its purpose is to chamfer not only straight parts and curved parts with large curvature, but also pipe end faces with small diameter and inner and outer R parts with small curvature. To provide a chamfering tool which is excellent in versatility and can also perform the following tasks, has a simple structure of a guide mechanism for positioning a chamfered part, and is hard to damage a workpiece.

[Means for solving problems]

Next, the configuration of the present invention will be explained with reference to a drawing (FIG. 1) showing an embodiment of the present invention.

The chamfering tool according to the present invention includes a cutter shaft 26 whose distal end, which is a cutting part, protrudes from the distal end of the chamfering tool main body 20 and is driven by a drive motor built into the chamfering tool main body 20. , a chamfering tool equipped with a chamfering part positioning guide mechanism 30 disposed near the tip of the cutter shaft 26 of the chamfering tool main body 20 and abutting against the workpiece (circular pipe 21) to define the chamfering area. The cutter shaft 26 has a hollow shaft shape, and the chamfered portion positioning guide mechanism 30 extends across the extending direction of the cutter shaft 26, with the tip of the cutter shaft protruding to the front. A reference plate 34 is formed with an opening 34A for placement, and one end is attached and fixed to the chamfering tool main body 20, and the other end passes through the cutter shaft hollow part 26B to attach the cutter shaft 26.
A reference rod 50 protrudes forward at the tip thereof, and has a cylindrical bulge guide (bulge) 52 formed in this protrusion for cooperating with the reference plate 34 to set the amount of chamfering. It is characterized by

[Effect]

Next, the operation of the present invention will be explained by taking as an example the case where the inner peripheral edge of the end face of the circular pipe 21, which is a workpiece, is chamfered.

The reference surface 34B of the reference plate 34 is in surface contact with the end surface 21A of the pipe 21, which is the workpiece, and the outer peripheral surface 52A of the tip bulge 52 of the reference member 50, which is the reference surface, is in surface contact with the inner peripheral surface 21A of the pipe. The two reference surfaces 34B and 52A contact each other and work together to guide the tip of the cutter shaft, which is the cutting portion, along the chamfered portion. That is,
The amount of chamfering by the chip 27 is this both reference surfaces 34B,
52A. Then, by moving the main body 20 so that the outer circumferential surface 52A of the bulging portion follows the inner circumferential surface 21A of the pipe, the inner circumferential edge of the end face of the pipe 21 can be chamfered.

Since the cylindrical bulging guide 52 is formed at the tip of a reference rod that passes through the hollow part of the cutter shaft 26 that rotates at high speed, it does not require a support like the guide roller of the prior art (see FIG. 8). It has a simple structure. In addition, the cylindrical bulge guide 52
is separate and independent from the cutter shaft 26, which rotates at high speed, so the bulge guide 52 does not rotate following the cutter shaft, and therefore is not covered by the bulge guide 52 during chamfering work. There is no risk of damaging the workpiece.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a longitudinal cross-sectional view of the main parts of the first embodiment of the present invention, and the drive motor accommodating portion of the chamfering tool is omitted.

In FIG. 1, reference numeral 20 denotes a chamfering tool main body, which has a cylindrical shape extending in the left-right direction in FIG. Reference numeral 26 denotes a cutter shaft with a cutting tip 27 attached to its tip, which is disposed in a direction perpendicular to the extending direction of the main body 20, and is attached to the motor case 22.
The rotational driving force of a drive motor (not shown) housed inside is transmitted to this cutter shaft 26 via a gear mechanism 24 (cap gears 24A, 24B) arranged inside a gear case 23. There is. The cutter 26 shaft has a hollow shaft shape, and this hollow portion 26B
A bar-shaped reference rod member (hereinafter simply referred to as reference member) 50, which will be described later, is disposed through the hole. Note that the reference numeral 25 is a bearing case, and the reference numeral 25B is a ball bearing.

A disc-shaped reference plate 34, which constitutes a part of the chamfer positioning guide mechanism 30, is attached to the cylindrical portion 25A of the bearing case 25 so as to be slidable in the vertical direction.

The plate 34 is arranged perpendicular to the rotation axis of the tip 27, that is, the cutter axis 26,
In the center of the plate 34 is a circular opening 34A having a diameter somewhat larger than the rotating diameter of the chip 27.
is formed. The opening 34A has a tapered shape whose diameter decreases forward (downward in FIG. 1), and the tip of the cutter shaft 26 is disposed protruding within the opening 34A, and the tip 27 protrudes from the lower surface 34B of the plate 34. A pipe 21, which is a workpiece, is to be cut. And plate 34
As shown in FIG. 1, the lower surface 34B is in contact with the end surface 21A of the pipe 21, which is the workpiece, and serves as a reference surface for setting the amount of chamfering in the vertical direction (vertical direction) in FIG. .

Further, on the lower surface 34B of the plate 34, there is a rod-shaped reference member 50 that penetrates the hollow portion 26B of the cutter shaft and projects forward of the tip of the cutter shaft, and constitutes another part of the chamfer positioning guide mechanism 30. is installed. This reference member 50 has one end connected to the gear case 2.
3 and is pressed and supported from the side by a locking screw 54 for preventing rotation. A metal bearing 51 is interposed between the reference member 50 and the inner circumferential surface of the cutter shaft hollow portion 26B at a midway position in the longitudinal direction of the reference member 50, which makes the rotation of the cutter shaft 26 smooth and allows the tip of the reference member 50 to Even if a force that causes the reference member to bend is applied, the reference member 5
0 is supported so that it does not bend.
A cylindrical bulge 52 is formed at the tip of the reference member 50 and bulges radially above the tip of the cutter shaft 26 to a position a predetermined distance d from the inner peripheral edge of the opening 34A. Outer peripheral surface 52A of portion 52
is a reference plane for setting the amount of chamfering in the left-right direction (horizontal direction) in FIG. That is, the lower surface 34B of the plate 34 constitutes a first reference surface, and the outer circumferential surface 52A of the tip bulge of the rod-shaped reference member 50 constitutes a second reference surface. 34B and 52A come into contact with the workpiece and work together to function as a guide for guiding the cutter shaft tip (chip 27), which is the cutting part, along the chamfered part.

Further, an adjustment screw 40 is provided between the plate 34 and the bearing case 25 for adjusting the amount of protrusion of the cut portion (chip 27) from the first reference surface (plate lower surface 34B). That is, the plate 34 is assembled to the bearing case cylindrical portion 25A so as to be slidable in the vertical direction by means of a key 38A and a keyway 38B provided between the bearing case cylindrical portion 25A and the plate cylindrical portion 34C. The plate 34 is adjusted by rotating a ring-shaped adjustment screw 40 screwed onto the outer periphery of the cylindrical portion 34C.
is slid in the vertical direction, thereby adjusting the amount of protrusion of the cutting portion (chip 27) downward from the first reference surface (plate lower surface 34B), in other words, the amount of chamfering.

In addition, the code 22A is a rotary drive shaft, the code 22B is a half-moon key, and the code 41 is an adjustment screw 40 and a plate 3.
This is a stopper screw for suppressing rotation between the two.

Next, a working procedure for chamfering the inner peripheral edge of the end face of the small-diameter circular pipe 21 using the chamfering tool according to the present embodiment will be described.

First, as shown in FIG. 1, the chamfering tool main body 20 is placed so that the tip bulging portion 52 of the reference member 50 is located within the hollow portion of the pipe 21. Then, the chamfering tool main body 20 is moved until the outer circumferential surface 52A of this bulging portion 52 comes into contact with the pipe inner circumferential surface 21B, and chamfering processing begins. The main body 20 is moved so as to perform a copying operation along the same line. That is, the main body 20 is moved in a sliding motion so that the outer circumferential surface 52A of the bulging portion remains in contact with the inner circumferential surface 21B of the pipe. To further explain this with reference to FIG. 2, the main body 20 is moved so that the rotational axis of the cutter shaft 26, indicated by the symbol _C1 , traces a trajectory indicated by the symbol 42.

In addition, chamfering of a portion that goes from a straight section to an outer (inner) R section and then back to a straight section, as shown in FIGS. The main body 20 is moved so that it makes contact and performs a copying operation.
Just move it.

In this way, the chamfering tool according to this embodiment can not only chamfer the straight parts and the inner and outer R parts with large diameters, but also chamfer the inner and outer peripheral edges of the end face of small diameter pipes and the inner and outer R parts of the small diameter pipes. can. Furthermore, the straight part, the R part,
Chamfering of discontinuous portions with undefined curvature, such as straight portions, can also be performed continuously.

FIG. 5 shows a vertical sectional view of the main part of the second embodiment of the present invention.

In the above embodiment, the cutter shaft 26 extends in a direction perpendicular to the extending direction of the chamfering tool body 20, and the chamfering machine is a horizontal type in which the main body 20 is used in a state substantially parallel to the surface on which the chamfering part extends. However, in this embodiment, the cutter shaft 26 is arranged in the same direction as the extending direction of the main body 20.
This describes a chamfering tool that is convenient for use in a state where the main body 20 extends and is substantially perpendicular to the plane in which the chamfered portion extends.

In this second embodiment a drive motor (not shown)
Rotary drive shaft 22A and cutter shaft 2 that transmit the rotational force of
6 are arranged in series, and the rotational driving force of the motor is transmitted to the cutter shaft 26 by a gear mechanism 44 consisting of three head gears 44A, 44B, and 44C.

One end of the reference member 50 is screwed and fixed to a central boss portion 61 of a horizontal support arm 60 supported by the gear case 23, and is supported by pressure from the side by a locking screw 62 for preventing rotation. The other end of the horizontal support arm 60 is supported via a metal bearing 47 in a hollow portion 45 of a hollow shaft-shaped cap gear 44B, and the cap gear 44B is further supported by a ball bearing 25B supported by a gear case 23. It is supported as such. Note that the reference numeral 64 is a lid.

The rest is the same as the first embodiment, and the same reference numerals are used to omit the explanation.

In addition to the effects of the first embodiment, the second embodiment has the advantage that it can be used in narrow spaces where the main body 20 of the first embodiment would be in the way.

[Effect of idea]

As is clear from the above explanation, according to the present invention, it is possible to chamfer not only straight parts and curved parts with large curvature, but also small diameter inner and outer R parts and small diameter pipe end faces, which could not be done conventionally. It can be carried out.

In addition, the cylindrical bulging guide penetrates the hollow part of the cutter shaft that rotates at high speed, and is formed at the tip of the reference rod that is separate and independent from the cutter shaft.
Unlike the guide rollers of the prior art, a support part is not required, and the structure of the guide part is that much simpler.

Furthermore, since the cylindrical bulging guide 52 is separate and independent from the cutter shaft which rotates at high speed, there is no fear that the workpiece will be damaged by the bulging guide during chamfering work.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the main part of the first embodiment of the present invention, Fig. 2 is a sectional view taken along the line - shown in Fig. 1, and Figs. 3 and 4 are explanations explaining the state of use thereof. 5 is a longitudinal sectional view of the main part of the second embodiment of the present invention, FIG. 6 is a side view of a conventional chamfering tool, FIG. 7 is a front view showing the main part cut away, and FIG. FIG. 8 is a sectional view of another example of a conventional chamfering tool. 20... Chamfering tool body, 21... Circular pipe as workpiece, 24, 44... Gear mechanism, 26...
... cutter shaft, 30 ... chamfer positioning guide mechanism, 34 ... reference plate, 34A ... opening,
34B...first reference surface, 50...vertical reference rod member, 52...bulge, 52A...outer peripheral surface of the bulge serving as second reference surface.

Claims (1)

[Claims for Utility Model Registration] A cutter shaft whose tip, which is a cutting part, protrudes from the end of the chamfering tool body and is driven by a drive motor built into the chamfering tool body, and the chamfering tool body. A chamfering tool equipped with a chamfer positioning guide mechanism disposed near the tip of a cutter shaft and in contact with a workpiece to define a chamfering area, the cutter shaft having a hollow shaft shape. The guide mechanism for positioning the chamfer includes a reference plate that extends across the direction of extension of the cutter shaft and has an opening for protruding the tip of the cutter shaft toward the front, and one end thereof. It is attached and fixed to the chamfering tool body, and the other end passes through the hollow part of the cutter shaft and projects forward at the tip of the cutter shaft, and the amount of chamfering is set in this protrusion in cooperation with the reference plate. A chamfering tool comprising: a reference rod on which a cylindrical bulging guide is formed;