JPH11254231A - Chamfering device for end surface circumferential corner part of workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To chamfer the corner part of a product having an end surface circumferential corner part by loading a cutting tool in a rotating mechanism to be in contact with the end surface circumferential corner part of workpiece, the rotating mechanism being for revolving the cutting tool along the end surface circumferential corner part of the workpiece. SOLUTION: The cutting surface 3a of a cutting tool 3 is brought into contact with the end surface inner side of a tube material 1. Accordingly, the cutting surface of the cutting tool 3 is brought into contact with the inner side corner part of the end surface of the workpiece 1 and cutting is started. At this starting time, the cutting tool 3 is caused to make its own rotation by a pneumatic motor 5 and simultaneously revolved by the rotation of a rotor 8. By the self- rotation and the revolution of the cutting tool 3, the burrs of the end surface circumferential corner part of the workpiece 1 are cut off altogether. Then, the cutting surface of the cutting tool 3 is brought into contact with the end surface outer side of the tube material 1. Thus, the rotating cutting surface of the cutting tool 3 is brought into contact with the outer corner part of the end surface of the workpiece 1, and cutting is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a material to be processed, for example, a hard non-metallic material, a non-ferrous metal, a long tube, a short tube such as steel, a tubular part, a tubular member such as a ring-shaped member, and a round bar-shaped member. A chamfering apparatus for a product having an end surface circumferential corner, that is, a chamfering apparatus suitable for removing a so-called burr formed on a cut surface of a metal pipe or a round bar or forming a groove for welding, and using the apparatus. Related to the beveling method.

[0002]

2. Description of the Related Art A long pipe produced in a pipe making process is usually cut to a certain size by a saw or a disk cutter in a finishing process, so that burrs are formed on inner and outer corners of the cut surface. Burrs are formed. For this reason, processing for removing burrs and smoothing the end face of the pipe has been conventionally performed. In addition to the purpose of removing burrs, a process of forming a smooth taper on an end face of a pipe and a process of forming a groove for welding end faces of a workpiece are performed.

[0003] For these machining purposes, chamfering machines such as cutting with a cutting tool, grinding with a grindstone, and polishing with a wire brush or a belt sander are used.
For example, as a cutting tool, a drill, a cutting tool, a burring reamer for removing burrs on the inside of a pipe, or the like is used, and a brush (JP-A-50-128895, US Pat. No. 4,133,070), Wire-buff (Japanese Utility Model Laid-Open No. Hei 5-93751), rotary grindstone (U.S. Pat.
No. 34,109, Utility Model Registration No. 25551035, Japanese Patent Application Laid-Open No. 10-544), and an apparatus using a rotary cutting blade (Japanese Patent Application Laid-Open No. 5-23958) are known. The chamfering machine for small-diameter pipes and medium-diameter pipes is usually finished by a tool turning type tool chamfering. However, the chamfering by the bite method is inefficient in work efficiency.
Japanese Patent Application Laid-Open Publication No. H11-163,087 discloses a device in which rotating brushes are arranged along a transfer skid side, and a pipe end surface is polished with a brush while pressing and transferring the tube.

Japanese Patent Publication No. Sho 60-59082 uses a cutting tool which rotates around the axis of the end face circumference of a workpiece such as zirconium alloy or stainless steel, and the cutting tool has a tapered outer peripheral edge of a pipe end face. Disclosure of a device with a special structure that combines a cutting tool and a drill, and has a blade that cuts the inner peripheral edge of the pipe end face and a blade that cuts the pipe end face at right angles to the pipe axis. doing.
Japanese Patent Laying-Open No. 6-55314 relates to a device for gripping a chamfering tool such as a circumferential portion of an end face of a workpiece, and a first tool for chamfering the outer circumference of the circumferential face of an end face of the workpiece and an inner circumference. It discloses a configuration in which second and third cutting tools for chamfering are detachably attached.

[0005] Japanese Patent Application Laid-Open No.
Japanese Patent Publication No. 112747 discloses a polishing apparatus using a belt sander that can automatically perform polishing and groove processing of the inner and outer surfaces of the end face circumferential portion of the medium diameter pipe. U.S. Pat. No. 4,934,109 discloses a workable circular device as a portable device suitable for forming a welding groove on an incorrectly cut pipe end face at a gas pipeline construction site or the like. A support shaft extending from the support disposed on the inner surface of the circumference to the outside of the pipe end surface along the central axis of the workpiece is provided, and a rotating wheel is provided on the support extending in a direction orthogonal to the shaft, and the support is provided. An apparatus is described in which a screw wheel is manually turned to press a rotary grinding wheel against an end surface of a workpiece. This device revolves a rotating grinding wheel along a surface cut in a direction perpendicular to the center axis direction of a workpiece, or a circumferential surface cut at a slight angle, and the rotating grinding wheel is rotating. This is to grind the end face of the pipe at the flat part.

[0006]

In a chamfering apparatus for a corner portion of a circumferential end face of a tubular material, when chamfering with a cutting tool, complete chamfering is performed by taper cutting of an outer peripheral edge of the corner portion of the end face. It is necessary to taper the peripheral edge and grind the cut surface in a direction perpendicular to the central axis of the pipe, and there are three cut surfaces. For this reason, it is only necessary to employ a dedicated cutting tool for each processing surface, and the removal of burrs on the inner surface side of the corner of the end surface of the small-diameter workpiece can be performed using a burring reamer or the like. In addition, it is inevitable that the structure of the operation control device for each tool will be complicated, and it is easy to cause misalignment between tools, and high precision, smooth, quick, and low cost It was difficult for processed materials.

In the invention described in Japanese Patent Publication No. 60-59082, the number of cutting tools is reduced to two to perform the above-mentioned three cuttings. However, the diameter of the drill and the diameter of the circumference of the workpiece are described. Are limited to substantially the same, and a drill and a tool having a special structure are used, and there are restrictions such as a necessity of strict positioning with respect to a circumferential portion of a workpiece to be opposed. In addition, the invention described in U.S. Pat. No. 4,934,109 can be used only for medium- and large-diameter pipes of a certain size or more because a support for a portable polishing tool is disposed inside a tubular member. In the case of small-diameter pipes, it is difficult to arrange the support inside the pipe, chamfering the inner corner of the end face circumferential corner is also difficult, and the rotating wheel is pressed against the cut surface. A mechanism and the like for positioning are also required.

[0008] In particular, recently, for example, a thin stainless steel pipe used in a semiconductor manufacturing apparatus or the like requires an ultra-clean finish on the surface and the end face of the pipe, and burrs on the end face of a small-diameter metal pipe can be formed quickly and accurately. A chamfering device suitable for removing and smoothing, especially a device that can perform high-precision chamfering by buffering the cutting resistance even if the cut surface is not a perfect circle or the burr shape is uneven. Development is required. The present invention solves these problems, and provides an apparatus and a method capable of chamfering a small-diameter tubular material from a medium-diameter tubular material quickly, accurately, and at low cost using only one cutting tool. Aim. Another object of the present invention is to provide an apparatus and a method suitable for chamfering not only a tubular material but also a corner portion of a product having an end surface circumferential corner portion.

[0009]

SUMMARY OF THE INVENTION The present invention is an apparatus which enables rapid chamfering and exhibits an effect on buffering cutting resistance. The chamfering is performed on a peripheral edge of a workpiece with a cutting tool. In the apparatus, the chamfering device is installed to face the workpiece, the cutting tool comprises a rotating shaft connected to a rotation drive source for rotation and a cutting surface provided at the tip thereof, The workpiece can be moved forward and backward with respect to the end surface circumferential angle portion, and is held by the holder so that the cutting surface is inclined and contacts the end surface circumferential angle portion when advanced.
The holder has a tilting mechanism that enables the cutting surface to come into contact with the circumferential edge of the end face of the workpiece, and furthermore, the cutting tool is placed in contact with the circumferential edge of the edge of the workpiece. Provided is a chamfering device for an end surface circumferential corner portion of a workpiece, which is mounted on a rotation mechanism that revolves along the end surface circumferential angle portion of the work material.

As the tilting mechanism, known means can be adopted. In the apparatus of the present invention, in particular, the holder is supported by the fixed support and the movable support, and the fixed support is used as a fulcrum, and the movable support is used. Is preferably connected to the holder elastically via a spring and moves up and down. The tilting mechanism is
When the cutting tool is elastically connected to the holder via a spring, high-speed and high-precision tilting operation is possible, and the contact between the cutting tool and the work surface is elastically performed by the spring. Good followability is desirable. In order to perform the most efficient chamfering, the cutting tool provided at the tip of the rotating shaft has a substantially conical shape like a spear tip, and it is desirable that the conical surface be the cutting surface. As the material of the cutting tool, a normal cutting tool material such as a carbide tool or high-speed tool steel or a grindstone material can be used.

In order to chamfer the end surface circumferential corner of the tubular material using the chamfering apparatus of the present invention, it is necessary to extend a line parallel to the central axis of the tubular material and passing through the center of the thickness of the tubular material. The position of the fulcrum of the fixed support portion is adjusted and adjusted, and the cutting surface is brought into contact with the circumferential edge of the end surface of the tubular material to rotate the rotating shaft of the cutting tool and revolve the rotating shaft by a rotating mechanism, thereby resolving the end surface of the tubular material. It is preferable to chamfer only the inside of the circumferential corner, only the outside, or both the inside and the outside. In this method, both the inside and the outside can be chamfered with only one cutting tool. Either the inside or the outside may be processed first.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to chamfering of a small diameter metal pipe will be described below in detail with reference to the drawings. FIG. 1 is a partially cutaway side view showing a chamfering apparatus of the present invention. 2A is a cross-sectional view taken along line XX of FIG.
FIG. 3 is a sectional view taken along the line YY. FIG. 3 is a side view showing the shape of a cutting tool suitable for use in the apparatus of the present invention. FIG. 4 is a side view showing a method of chamfering the inside of the end surface circumferential corner of the tubular material using the apparatus of the present invention.
FIG. 5 is a side view showing a method of chamfering the outside similarly.

As shown in FIG. 1, the outer periphery of a workpiece 1 conveyed to a processing position is fastened by a chucking device 2,
Position and fix. The chamfering device is installed facing the workpiece 1. The cutting tool 3 has its axis 3b passing through the center of the holder 4 integrated with the rotary drive source 5,
A tool connected to the rotary drive source 5 or the like, for example, a commercially available carbide rotary cutter, or a tool capable of high-speed rotation of tens of thousands of times per minute is suitable. The rotary drive source 5, for example, a pneumatic motor, is connected to the air supply system P-1 by a rotary joint 6 and a one-touch socket 7. The cutting tool 3 can be rotated by supplying air to the pneumatic motor, and the cutting tool 3 rotates on its axis 3b as a rotation axis.

A rotary drive source 5 such as a pneumatic motor is housed in a cylindrical rotor 8 and fixed by screws or the like (not shown). The workpiece 1 and the cylindrical rotor 8 are arranged such that the rotation center axis of the cylindrical rotor 8 constituting the rotation mechanism coincides with the center axis of the workpiece 1. The cylindrical rotor 8 is rotated by a rotary drive source 9, for example, an electric motor.
Rotate through 0. With the rotation center axis of the workpiece 1 and the rotation center axis of the rotor 8 aligned in a straight line,
The cylinder 12 is operated to move the chamfering device mounted on the rail 11 so that the cutting tool 3 advances toward the circumferential edge of the end surface of the workpiece 1.

The holder 4 is supported at two points: a movable support A and a fixed support B. As shown in FIG.
Is located on the rear end side of the holder 4, the supporting member 15 is fixed to the holder 4 with screws 16, 16, and brackets 17, 17 are provided on both side surfaces of the holder 4.
The support pins 18, 18 are loosely fitted to the support member 17 and the support member 15, and the holder-4 is supported by the support pins 18, 18. The support pins 18 serve as fulcrums for the tilt of the holder 4. This support method may be any method that enables the tilting of the cutting tool as described below with the fixed support portion B as a fulcrum, and is not particularly limited to the support by the pin. By moving the brackets 17 up and down according to the diameter of the tubular member 1, the distance from the extension of the central axis of the tubular member 1 to the fulcrum can be adjusted, and the diameter of the tubular member 1 is increased. At times, the distance between the center axis and the fulcrum is increased accordingly.

On the other hand, the movable supporting portion A is located on the tip side of the holder 4, and the supporting member 19 is attached to the holder 4 by a screw 2.
The yoke 21 is provided at the lower part of the holder 4, and two support pins 22, 22 are vertically erected vertically on the yoke 21 with the holder 4 interposed therebetween. Insertion holes 23, 23 provided differently in the upper and lower positions
And the support pins 22 are inserted and fitted. Support pins 22,
22 is fitted with helical springs 24, 24,
By tightening the nuts 25, 25 through
The support member 19 is fixed to the yoke 21. The strength of the spring force can be adjusted by rotating and tightening the nuts 25, 25. The yoke 21 is moved up and down by the air cylinder 14. When the yoke 21 is raised, the holder 4 is raised by the force applied to the left nut 25 and the spring 24 shown in the figure, and when the yoke 21 is lowered, the holder 4 is lowered by the force applied to the right nut 25 and the spring 24 shown in the figure. I do.

The cutting tool 3 is supported by the support pins 18 of the fixed supporting portion B as fulcrums so that the cutting tool 3 approaches or moves away from the center axis of the workpiece 1 fixed and fixed.
Can be tilted by the movable support A (vertical direction in the figure)
It has become. Parallel to the central axis of the tubular member 1, the tubular member 1
The fulcrum of the fixed support portion B is positioned and adjusted on an extension of a line passing through the center of the thickness of the tubular member, and the cutting surface 3a of the cutting tool is brought into contact with the circumferential edge of the end surface of the tubular member 1 so that the rotation axis of the cutting tool 3 is adjusted. Rotate. The rotation axis of the cutting tool 3 is slightly inclined with respect to the central axis of the tubular member 1 during cutting.

The springs 24 are provided so that the cutting tool 3
Since the cutting tool 3 is elastically supported when cutting the end surface circumferential corner, the cutting resistance is buffered when the roundness of the tubular material 1 is poor or when the burr height is uneven. Then, the load on the motor for rotating the cutting tool 3 and the motor for rotating the rotor 8 is reduced. A speed controller 13 connected to the air supply systems P-2 and P-3 via a rotary joint 15 is provided outside the rotor 8 and a cylinder 14 is provided.
Of the cutting tool 3, the tilting degree and the tilting time of the cutting tool 3 are adjusted, the force for pressing against the surface to be cut is controlled, and in addition to the action of the springs 24, 24, the cutting tool 3
To resiliently cushion the cutting force.

As shown in FIGS. 3A to 3E, the cutting tool 3 uses a cutting tool or a grinding wheel having a cutting surface 3a called a master bar, a super steel bar, a rotary bar and the like and a shaft portion 3b. . For the shape of the cutting surface, tools of various shapes having a cylindrical cutting surface such as a normal reamer or a bar-shaped grindstone can be used, but especially for chamfering small diameter pipes, a burring reamer conventionally used is used. Those having the same conical shape are preferable, and those having a cutting blade of an appropriate shape on the surface are preferable. In addition, if the conical surface is a concave curved surface, a tapered surface having a rounded end surface circumferential corner can be formed.

The shape of the cutting tool is selected according to the chamfered shape of the end surface circumferential corner of the tubular material. For example, D and E in FIG.
When using a tool whose cutting surface is parallel to the rotation axis, such as
The chamfered surface is wide and the shaving depth is small, which is particularly effective for chamfering at the time of joint welding of thin-walled tubes. When a conical shape is used as shown in FIGS. 3A to 3C, it is suitable for removing large burrs and forming a welding groove for thick wall joint welding.

The angle of inclination of the conical surface with respect to the central axis is appropriately determined according to the diameter and thickness of the workpiece 1, the distance between the tip of the cutting tool 3 and the fulcrum of the fixed support, the formation of burrs, and the like.
The smaller the inclination angle and the larger the distance between the tip of the cutting tool 3 and the fulcrum, the smaller the angle of the taper formed at the end surface circumferential angle portion. For example, with a diameter of 20 mm and a wall thickness of 3 mm, the distance between the tip of the cutting tool and the fulcrum is 125 m.
m, cone bottom diameter 16 mm, cone height 2
5 mm and an inclination angle of the conical surface of about 35 degrees are preferable. The amount of cutting by chamfering is determined by the contact area between the cutting surface 3a of the cutting tool 3 and the circumferential edge of the end surface of the workpiece 1. In order to obtain a predetermined cutting amount, the tilt angle of the cutting tool 3, the tubular material 1 Feed amount of the cutting surface 3a to the end face of the
The rotation speed, revolution speed, cutting time, and the like of the cutting tool 3 are controlled. The rotation speed and revolution speed of the cutting tool 3 can be adjusted by the amount of air supplied to the pneumatic motor and the rotation speed of the unit motor.

The work material is not limited to a long material, and can be applied to various parts having a tubular opening. The device of the present invention
If the workpiece is a round bar, it can be used for chamfering outside the end face. As a rotary drive source of the cutting tool, an electric motor or the like can be used instead of the pneumatic motor.

Next, an example in which a tubular material is used as the workpiece 1 as a specific method of using the apparatus of the present invention will be described. The positions of the rotor 8 and the cutting tool 3 of the chamfering device are adjusted in accordance with the inner diameter, outer diameter, and thickness of the end surface circumferential corner of the tubular material 1. By this adjustment, the rotation center axis of the rotor 8 is made to coincide with the center axis of the workpiece 1 which is positioned and fixed.

The workpiece 1 is supplied one by one to a place where the chamfering apparatus is installed by a transport table (not shown) such as a transport roll, and is stopped at a predetermined position by a stopper (not shown) and supplied. The center axis of the work piece 1 is adjusted so as to coincide with the center axis of the rotor 8. Then, after confirming that the vehicle has stopped at a predetermined position by a sensor such as an optical sensor (not shown), it is fastened by the chucking device 2. Next, the air supply system P-1 is connected to the pneumatic motor 5.
Cutting tool 3 gripped by holder 4 by supplying air from
Is rotated. At this time, the center axis of the cutting tool 3 is set at a height which is substantially the center of the thickness of the workpiece 1 in a substantially horizontal state.

Next, the air cylinder 14 is actuated to advance the cutting tool 3 in a state where the tip of the cutting tool 3 is tilted upward with the pin 18 loosely fitted to the bracket 17 of the fixed support portion B as a fulcrum. The cutting tool 3 is stopped by approaching the tip of the cutting tool 3 to the end face of the cutting tool 3. Next, as shown in FIG. 4A, the air cylinder 14 is operated (1), the cutting tool 3 is tilted downward, and the cutting tool 3 is positioned closer to the center axis than the inside of the end face of the workpiece 1. . Next, the cutting tool 3 is advanced and stopped until the cutting surface 3a is positioned inside the end face of the workpiece 1 (2). Further, the air cylinder 14 is actuated (3), and the cutting tool 3 is pushed upward, and FIG.
The cutting surface 3a of the cutting tool 3 is brought into contact with the inside of the end face of the tubular member 1 as shown in FIG. Thereby, the cutting surface 3 of the cutting tool 3
a contacts the inner corner of the end face of the workpiece 1 and cutting is started.

At the beginning, the rotation and revolution of the cutting tool 3 are more effective. So, for example, anticipating this point of contact and setting it on a timer,
The rotor 8 is rotated by the motor 9 in advance. As shown in FIG. 4C, the rotor 8 rotates around its horizontal center axis as a rotation axis, whereby the cutting tool 3 revolves along the circumferential edge of the end surface of the workpiece 1 (4). . That is, the cutting tool 3 revolves by the rotation of the rotor 8 simultaneously with the rotation of the pneumatic motor 5. Due to the rotation and revolution of the cutting tool 3, burrs on the circumferential edge of the end surface of the workpiece 1 are cut and removed at once. In addition, the time required for cutting is 2
A time of about three times is sufficient.

After the lapse of a predetermined cutting time, the air cylinder 14 is operated while the rotation and revolution of the cutting tool 3 are continued (5), the cutting tool 3 is tilted downward, and the cutting tool 3 is retracted (6). ). Once retracted, cutting tool 3
The cutting tool 3 is advanced in a state where the cutting tool 3 is tilted downward, and the tip of the cutting tool 3 approaches the end face of the workpiece 1 to stop. Next, as shown in FIG. 5A, the air cylinder 14 is operated (7) to tilt the cutting tool 3 upward, so that the cutting tool 3 is positioned at a level outside the end face of the workpiece 1. Next, the cutting tool 3 is advanced until the cutting surface 3a is positioned outside the end face of the workpiece 1 (8).
Is operated to push down the cutting tool 3 downward (9), and as shown in FIG. 5B, the cutting surface 3a of the cutting tool 3 is
Contact the outside of the end face. Thus, the rotating cutting surface 3a of the cutting tool 3 comes into contact with the outer corner of the end face of the workpiece 1 and cutting is started.

Then, as in the case of cutting the inside of the end face, FIG.
As shown in C, the rotor 8 is rotated with its horizontal center axis as the rotation axis, and the cutting tool 3 is rotated along the circumferential edge of the end surface of the workpiece 1 (10). This time, the burrs on the outer peripheral corners of the end face are cut and removed at a glance like the cutting and removing of the inner burrs. After a predetermined cutting time has elapsed, the cutting tool 3
While rotating and revolving, the cylinder 14 is operated (11), the cutting tool is tilted upward, and the cutting tool 3 is retracted (12). Through the above steps, deburring of the inner and outer surfaces of the end surface circumferential corners of the tubular member 1 can be completed in a short time with one tool.

By using the apparatus and the method of the present invention, chamfering of a circumferential edge portion of a workpiece having an outer diameter of about 20 mm and an inner diameter of about 17 mm can be performed at a high speed of about 6 seconds or less per tubular material. . Although the above specific example shows an example in which the inner side of the end face of the tubular member is deburred first, the outer side may be processed first. Further, if necessary, only the outer side or the inner side may be processed.

[0030]

According to the present invention, it is possible to perform a chamfering process such as removing burrs or forming a groove on the outer and / or inner circumferential portions of the end surface of the workpiece with a single cutting tool. However, since the apparatus is not complicated and the apparatus can be simplified, the cost reduction effect is large. Further, since the cutting tool 3 is urged by the spring 24, the cutting tool 3 is elastically pressed against the corner of the workpiece 1, so that even if the shape of the pipe end face is distorted, it is flexible. It has the effect of following the circumferential angle of the end face,
Smooth cutting becomes possible. Therefore, the inside and / or inside of the end surface circumferential corner of the medium- or small-diameter tube, which has been particularly difficult in the past, have been considered.
Alternatively, burrs formed on the outside can be quickly and accurately removed, and this has a remarkable effect on chamfering the end face of a small-diameter pipe such as a stainless steel pipe for a semiconductor manufacturing apparatus that requires ultra-high cleanliness of the inner surface of the pipe.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a chamfering device of the present invention.

FIG. 2 is a sectional view taken along line XX (A) and line YY (B) of FIG.

FIG. 3 is a side view showing the shape of a cutting tool 3 used in the apparatus of the present invention.

FIG. 4 is a side view showing the steps of an embodiment of chamfering the inside of the end face of the tubular material using the apparatus of the present invention.

FIG. 5 is a side view showing the steps of an embodiment of chamfering the outside of the end face of the tubular material using the apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work material 2 Chucking device 3 Cutting tool 4 Holder 5 Rotation drive source 8 Rotor 9 Rotation drive source 10 Rotary transmission belt 11 Rail 12 Cylinder 13 Speed controller 14 Air cylinder 15 Support member 17 Bracket 18 Support pin 19 Support member 21 Yoke 22 Support pin 24 Spring

Claims (4)

[Claims] 1. An apparatus for chamfering an end surface circumferential corner of a workpiece with a cutting tool, wherein the chamfering apparatus comprises:
The cutting tool is installed to face the workpiece, and the cutting tool includes a rotating shaft connected to a rotation drive source for rotation and a cutting surface provided at a tip end thereof. The cutting surface is held by a holder so that the cutting surface is inclined and comes into contact with the circumferential edge of the end surface when moving forward. A rotation mechanism that has a tilting mechanism that makes it possible to contact the corners, and further revolves the cutting tool along the circumferential edge of the end surface of the workpiece while the cutting tool is in contact with the circumferential edge of the workpiece. A chamfering apparatus for a chamfer at a circumferential edge portion of a workpiece, wherein the chamfering apparatus is mounted on a mechanism. The tilting mechanism supports the holder with a fixed support and a movable support, and uses the fixed support as a fulcrum, and the movable support is elastically connected to the holder via a spring and moves up and down. The chamfering apparatus according to claim 1, wherein: 3. The chamfering apparatus according to claim 1, wherein the cutting tool provided at the tip of the rotary shaft has a substantially conical shape, and the conical surface is used as a cutting surface. 4. A method of chamfering a circumferential edge portion of a tubular material using the chamfering device according to claim 1, wherein a center of a wall thickness of the tubular material is parallel to a central axis of the tubular material. Positioning and adjusting the fulcrum of the fixed support portion on the extension of the passing line, and rotating the rotation axis of the cutting tool by rotating the rotation axis of the cutting tool by contacting the cutting surface with the end surface circumferential corner of the tubular material,
A method of chamfering only the inside, the outside only, or both the inside and outside of the end surface circumferential corner of the tubular material.