JP2000071101A - Chamfering apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately chamfer the outer peripheral edges of the ends of a plurality of pipes and bars with different diameters by forming a chamfering cylindrical recessed part at one end of a chamfering apparatus body, and by removably mounting a guide member selectively used according to the outer diameter of the pipe or the bar to be chamfered. SOLUTION: When a small-diameter pipe 4 is chamfered, a male screw portion 25 of a second guide member 2b for small diameter is screwed into a female screw portion 11a of a cylindrical recessed part 11 of a chamfering apparatus body 1. At this time, an unused first guide member 2a for large diameter is hinged with and held on a holding portion 12 of the other end of the body 1. In this state, a pipe with an outer diameter substantially with the inner diameter of a through hole 26 of the second guide member 2b is inserted into the through hole 26, and is pressed until the tip of the pipe 4 touches a cutting blade projecting toward a corner portion 14a of a second shrunk diameter portion 14. Then chamfering is performed by holding the chamfering apparatus body 1 with a hand and by rotating it until the tip surface of the pipe 4 touches the bottom 14b. For chamfering a large-diameter pipe, the similar work is performed after replacing the first guide member 2a by the second guide member 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chamfering device for chamfering the outer peripheral edge of a pipe or rod connected to a joint.

[0002]

2. Description of the Related Art When a pipe made of vinyl chloride resin or the like is connected via a pipe joint, in order to make it easier to insert the pipe end into the pipe joint, a pipe end on the side to be connected is usually used at a construction site. The outer edge is chamfered. By the way, conventionally, in order to chamfer the inner edge of the tube end, a reamer 100 having a conical blade 101 on the inside as shown in FIG. 9 or a rotating shaft about the rotation axis at the tip as shown in FIG. Although a chamfer such as a scraper 200 having a possible blade 201 has been put on the market, there is no chamfer that can easily bevel the outer peripheral surface of the tip of a pipe or a rod in the field as described above.

[0003] Therefore, conventionally, an operator has been chamfering on site by holding a cutting tool such as a cutter, a file or a grinder by hand. However, in the work of chamfering by holding the cutting tool by hand as described above, the workability is poor, it takes time, and it requires skill to chamfer so as to have a uniform taper in the circumferential direction. There is.

[0004]

SUMMARY OF THE INVENTION In view of such circumstances, the present invention can easily and easily prepare a plurality of pipes and rods having different diameters by simply preparing one chamfer. It is an object of the present invention to provide a chamfer that can be accurately chamfered.

[0005]

In order to achieve such an object, the chamfering device according to the present invention has a cylindrical concave portion for chamfering, and the center of the cylindrical concave portion is located behind the cylindrical concave portion. At least one reduced diameter portion having the same central axis as the axis and decreasing in diameter in a stepwise manner from the bottom of the cylindrical concave portion toward the back side is provided, and a corner of the cylindrical concave portion and / or the reduced diameter portion is provided. A chamfering body having at least one slit-shaped notch hole facing a part thereof from the outside, and a chamfering body that is detachably attached to the chamfering body and at least partially fits in the cylindrical recess. And at least one guide member provided with a through hole having an inner diameter substantially the same as the outer diameter of the corresponding reduced diameter portion, and a surface so that the cutting edge faces the chamfer body from the notch hole. A configuration including a cutting blade mounted on the taker body; It was.

Further, in the chamfer of the present invention, claim 2 is provided.
The guide member is mounted in the cylindrical concave portion of the chamfer main body by screw connection, as in claim 3. The guide member has a plurality of guide members, and the guide member on the small diameter side has a through hole formed therein. 5. The configuration in which the portion is accommodated in the cylindrical recess while being accommodated in the through hole of the guide member for one size and large diameter. A configuration in which a holding portion for a guide member that is not mounted on the body is provided.
When the tip surface of the pipe or rod is received at the bottom of the cylindrical recess or the bottom of the reduced diameter part, the part that will be the end position of the insertion part into the joint according to the diameter of the pipe or rod is externally exposed, and the marking line is drawn. It is preferable to provide a guide portion for fixing the tip of the tool to the outer peripheral surface of the pipe or rod.

In the present invention, the material of the chamfer body may be a metal material such as brass or bronze, or a synthetic resin such as polyvinyl chloride or polyethylene. The cutting blade is
It is not particularly limited as long as it is a harder material than the pipe or rod to be chamfered.
It is desirable to have excellent corrosion resistance, for example, stainless steel or a chromium-plated metal material is preferable.

The shape of the cutting blade depends on the type (diameter and material, etc.) of the pipe or rod to be chamfered, and is not particularly limited. For example, a thin plate having a thickness of about 0.1 to 5.0 mm is preferable. Further, the tip of the portion in contact with the pipe or rod to be chamfered, that is, R of the cutting edge portion is preferably 0.5 mm or less. As a method of fixing the cutting blade to the chamfer body, a method using screws or bolts is generally used, but a method of bonding or welding may be used.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. 1 to 3 show one embodiment of a chamfer according to the present invention.

As shown in FIGS. 1-3, this chamfer A
Is a chamfer main body 1, a first guide member 2a for a large diameter,
A second guide member 2b for small diameter is provided. The chamfer body 1 is made of brass, and has a cylindrical recess 11 for chamfering on one side and a cylindrical recess 11 on the other side with a partition wall 19 interposed therebetween, as shown in FIG. Guide member 2a not mounted
(2b) is provided.

On the inner side of the cylindrical concave portion 11, a female screw portion 11a whose central axis is aligned from the entrance side, a large diameter first reduced diameter portion 13, and a small diameter second reduced diameter portion 14 are sequentially provided. The first reduced diameter portion 13 and the second reduced diameter portion 14 are formed in the cylindrical concave portion 11.
The diameter is reduced stepwise toward the back of.

On the outer wall surface of the chamfering body 1, three knurled anti-skid parts 15, 15, 1 protruding in a flange shape.
5 are provided in parallel with each other, and a notch 16 having a substantially V-shaped cross section is provided.
a is provided with two slit-shaped notches 17a and 17b. The cutout hole 17a is provided so as to cross the corner portion 13a of the first reduced diameter portion 13, so that the inside of the cylindrical concave portion 11 can be seen from the outside.

The cutout hole 17b is provided so as to cross the corner portion 14a of the second reduced diameter portion 14, so that the inside of the cylindrical concave portion 11 can be seen from the outside. The notch 16
The bottom 16a has a notch 17a and a notch 1
A cutting blade 3 made of stainless steel is fixed via a fixing screw 31 so as to partially cover 7b. That is, the cutting blade 3
Protrudes into the cylindrical recess 11 so that its cutting edge crosses the corner 13a of the first reduced diameter portion 13 and the corner 14a of the second reduced diameter portion 14.

The holding portion 12 has a cylindrical shape and has a female screw portion 12 having the same diameter as the female screw portion 11a of the cylindrical concave portion 11 therein.
a is provided inside. The first guide member 2a is formed of brass, has a flange portion 21 at one end, a male screw portion 22 at the other end, and has the same inner diameter as the inner diameter of the first reduced diameter portion 13. A through hole 23 serving as a guide is formed in the center.

The second guide member 2b is made of brass, has a flange 24 at one end, a male thread 25 at the other end, and an inner diameter of the second reduced diameter portion 14. A through hole 26 serving as a guide having the same inner diameter is formed in the center. First guide member 2a and second guide member 2b
The flanges 21 and 24 have the same outer diameter as the slip stoppers 15, 15 and 15 of the chamfering body 1, and the outer peripheral surface thereof is knurled.
2, 25 are screwed into the female screw portions 11a, 12a.

Next, a method of using the chamfer A will be described. First, as shown in FIG. 3, when chamfering a small-diameter synthetic resin pipe (hereinafter, simply referred to as “pipe”) 4, the male screw portion 25 of the second guide member 2 b is replaced with the female screw of the cylindrical recess 11. The second guide member 2b is attached to the cylindrical concave portion 11 by being screwed to the portion 11a. At this time, the first guide member 2 a not attached to the cylindrical concave portion 11 is held by the holding portion 12 by screwing the male screw portion 22 into the female screw portion 12 a of the holding portion 12.

The cutting blade 3 having the outer diameter substantially the same as the inner diameter of the through hole 26 is projected through the through hole 26 of the second guide member 2b to the corner portion 14a of the second reduced diameter portion 14. Until the tip of the tube 4 hits the cutting edge of the cylindrical recess 11.
Insert inside. Next, the non-slip 15,
While holding the portions 15 and 15 by hand, the tube 4 is continuously rotated while being pressed toward the inside of the cylindrical concave portion 11 until the distal end surface of the tube 4 comes into contact with the bottom 14 b of the second reduced diameter portion 14.

That is, the rotation of the pipe 4 causes the cutting blade 3
Is chamfered on the outer peripheral surface of the tip of the tube 4.

On the other hand, although not shown, when chamfering a large-diameter pipe, the first guide member 2a is removed from the holding portion 12, and is replaced with the second guide member 2b. Similarly, the non-slip 15, 1 of the chamfer body 1
While holding the parts 5 and 15 by hand, insert the tube into the cylindrical recess 11.
The distal end surface of the tube is pressed toward the inside of the
The chamfering is performed by rotating it until it comes into contact with the bottom 13b.

The cutting waste is discharged to the outside of the chamfering unit 1 from the opening of the notch 17a or 17b not covered by the cutting blade 3.

That is, as described above, the chamfering device A can select the guide member 2a (2b) according to the diameter of the tube and mount it on the cylindrical concave portion 11 so that the tube can pass through the through hole 23 ( 2
6), the center axis of the tube is guided by the through hole 23 (26) and coincides with the center axis of the cylindrical concave portion 11. Therefore, the outer edge of the distal end of the tube can be accurately and easily chamfered only by rotating the tube while pressing it toward the back of the cylindrical concave portion 11.

Further, since the holding portion 12 for holding the unused guide member 2b (2a) is provided on the chamfering body 1, the unused guide member 2b (2a) is not lost. . In addition, the pipe chamfered in this way is inserted into the joint, but as it is, it is not known whether or not it has been successfully inserted to the predetermined position of the joint. It is preferable to fill it out.

By the way, in a method of measuring a predetermined length from the pipe end with a measure or a ruler and writing the mark with a mark marking tool such as magic, the mark is marked on the surface only by a human hand. An operator or the like may say that the marking line is shifted. Therefore, in order to fill the marking line accurately,
It is preferable to use a marking device 5 as shown in FIG. 4 or a marking device 6 as shown in FIG.

As shown in FIG. 4, the marking device 5 has a cylindrical shape having a bottom 51 having an inner diameter substantially the same as the outer diameter of the pipe, and has a marking or the like on a peripheral wall at a predetermined pitch. Are provided with three slits 52 to 54 into which the tips of the holes can be inserted. The marking device 5 is inserted into the slit marking device 5 with the pipe inserted into the marking device 5 until the bottom surface of the marking device is received on the bottom 51. By inserting the part and rotating the pipe with the tip of the marking tool pressed against the peripheral surface of the pipe, the three different marking lines at different distances from the tip of the pipe are not displaced from the pipe surface. Can be filled out accurately.

On the other hand, as shown in FIG. 5, the marking line writing device 6 includes a writing device main body 61 and three body portions 62 to 64. The writing unit main body 61 has a cylindrical shape having a bottom 61a, and is provided with a substantially U-shaped notch 61b from the opening side to the bottom side.

The first body 62 has a cylindrical shape with both ends open shorter than the length of the writing unit main body 61, the outer diameter of which is substantially the same as the inner diameter of the second body 63, and the second body 62. 63 can be inserted. The second body 63 has a cylindrical shape with openings at both ends shorter than the length of the first body 62, the outer diameter of which is substantially the same as the inner diameter of the third body 64, and the inside of the third body 64. It can be inserted into.

The third body 64 has a cylindrical shape with both ends open shorter than the length of the second body 63, the outer diameter of which is substantially the same as the inner diameter of the writing device main body 61, and the writing device main body 61. It can be inserted inside.

The marking line writing device 6 is inserted into the writing device main body 61 in the order of the third body portion 64, the second body portion 63, and the first body portion 62, and the ends of the body portions 61 to 64 are connected. It is brought into contact with the bottom 61a of the writing unit body 5. Then, a tube (not shown) having an outer diameter substantially equal to the inner diameter of the first body portion 62 is brought into contact with the bottom 61 a until the first tube reaches the bottom 61 a.
Insert it into the torso 62. Next, the tip of a marker or the like, such as a magic mark, is exposed from the notch 61b into the writing device main body 61.
The front end of the marking tool is brought into contact with the surface of the pipe while the first body 62 is along the edge of the writing device main body 61 on the opening side.
By rotating the pipe one or more rounds, a marking line can be accurately written on the pipe surface at the same position as the length of the first body portion 62 from the pipe tip.

Further, the first body 62 is removed, and a tube having an outer diameter substantially the same as the inner diameter of the second body 63 is brought into contact with the bottom 61a until the bottom 61a.
Insert it into the trunk 63. Next, the tip of a marker or the like is drawn from the notch 61b into the writing unit main body 61, and the marking line is drawn along the opening edge of the writing unit main body 61 of the second body 63. The tip of the writing tool is brought into contact with the surface of the tube. Then, by rotating the pipe one or more rounds, a marking line can be accurately written on the pipe surface at the same position as the length of the second body 63 from the pipe tip.

Further, the second body 63 is removed, and a tube having an outer diameter substantially the same as the inner diameter of the third body 64 is inserted into the third body 64 until it hits the bottom 61a. Next, the tip of a marker or the like is drawn from the notch 61b into the writing device main body 61, and the mark is drawn along the edge of the third body portion 64 on the opening side of the writing device main body 61. The tip of the writing tool is brought into contact with the surface of the tube. Then, by rotating the pipe one or more turns, a mark line can be accurately written on the pipe surface at the same position as the length of the third body portion 64 from the pipe tip.

Further, the third body portion 64 is removed, and a tube having an outer diameter substantially equal to the inner diameter of the writing device main body 61 is inserted into the writing device main body 61 until it hits the bottom 61a. Next, the tip of the marking device is brought into contact with the surface of the tube along the opening edge of the writing device main body 61. Then, by rotating the pipe one or more times, the marking line can be accurately written on the pipe surface at the same position as the length from the pipe tip to the bottom 61a or the opening end of the writing device main body 61.

Further, if the tip of the marking line writing tool is made to follow the bottom of the notch 61b, the notch 61b is cut from the bottom of the writing unit main body 61.
Marking lines can be accurately written on the pipe surface at the same position as

6 to 8 show another embodiment of the chamfer according to the present invention. As shown in FIGS. 6 to 8, the chamfer B includes a chamfer main body 7 and three guide members 8a, 8b, 8c.

The chamfering body 7 includes a cylindrical recess 71 having a bottom 71a at one end, a fixing screw 72, and a cutting blade 9. The diameter of the cylindrical concave portion 71 is reduced stepwise on the inner side to form three reduced diameter portions 73a, 73b, and 73c.

On the outer wall surface of the chamfering unit main body 7, three knurled non-slip pieces 74a projecting in a flange shape are provided.
74b and 74c are provided in parallel, and a cutout 75 is provided at the end on the side of the reduced diameter portions 73a, 73b and 73c. The notch 75 has four slit-shaped notches 76a, 76b, 76c, and 76d at its bottom.

The cut-out hole 76a is provided so as to cross the corner of the cylindrical concave portion 71 so that the inside of the cylindrical concave portion 71 can be seen from the outside. The cutout hole 76b is provided so as to cross the corner of the first reduced diameter portion 73a so that the inside of the cylindrical concave portion 71 can be seen from the outside.

The cut-out hole 76c is provided so as to cross the corner of the second reduced-diameter portion 73b so that the inside of the cylindrical concave portion 71 can be seen from the outside. The notch 76d has the third
It is provided so as to cross the corner of the reduced diameter portion 73c so that the inside of the cylindrical concave portion 71 can be seen from the outside.

The cutting blade 7 is formed at the bottom of the notch 75 so that the cutting edge covers a part of each of the notches 76a to 76d.
7 is fixed via fixing screws 78. That is,
The cutting edge of the cutting blade 77 protrudes into the cylindrical recess 71 from the notch holes 76a to 76d. On the outer wall surface of the chamfer main body 7, screw holes for screws 9 for fixing guide members 8a, 8b, 8c, which will be described later, are provided. A notch 79 for forming a marking line, described later, which is substantially U-shaped is provided.

The first guide member 8a has the same outer diameter as the inner diameter of the cylindrical concave portion 71, and has only a cylindrical through hole forming portion provided with a through hole 85 having the same inner diameter as the first reduced diameter portion 73a. It is composed of Further, when the first guide member 8a is inserted into the cylindrical concave portion 71, the outer peripheral edge of the distal end portion is chamfered so that the first guide member 8a does not hit the cutting edge of the cutting blade projecting into the cylindrical concave portion 71. A notch 82 is provided on the opening side of the concave portion 71.

The notch 82 is formed in such a size that the tip of the fixing screw 9 is located at a position facing the inside of the notch 82 when the first guide member 8a is inserted until it comes into contact with the bottom of the cylindrical recess 71. I have. The second guide member 8b has the same outer diameter as the inner diameter of the first guide member 8a, and has a second reduced diameter portion 73b.
It is composed of only a cylindrical through-hole forming portion provided with a through-hole 86 having the same inner diameter as that of.

When the second guide member 8b is inserted into the cylindrical recess 71 through the first guide member 8a, it does not hit the cutting edge of the cutting blade 77 projecting into the cylindrical recess 71. The outer edge of the tip is chamfered,
A notch 83 is provided on the opening side of the cylindrical concave portion 71. The notch 83 is formed so that the second guide member 8 b is
It is formed in such a size that the tip of the fixing screw 9 comes to a position facing the inside of the notch 83 when it is inserted until it comes into contact with the bottom of a.

The third guide member 8c is connected to the second guide member 8
It has the same outer diameter as the inner diameter of b, and is composed of only a cylindrical through-hole forming portion provided with a through-hole 87 having the same inner diameter as the third reduced diameter portion 73c. Also, the third guide member 8c
The outer peripheral edge of the tip is chamfered so that when it is inserted into the cylindrical recess 71 via the second guide member 8b, it does not hit the cutting edge of the cutting blade 77 projecting into the cylindrical recess 71.

Next, how to use the chamfer will be described. When chamfering a pipe having the same outer diameter as the inner diameter of the third guide member 8c, the chamferer B first sets the first guide member 8
a, the second guide member 8b and the third guide member 8c are connected to the bottom of the cylindrical recess 71 to which the tips of the guide members 8a to 8c correspond, the bottom of the first reduced diameter portion 73a and the bottom of the second reduced diameter portion 73b. And insert the first guide member 8a and the second guide member 8b into the respective notches 82 and 83.
Is positioned so as to face the tip of the fixing screw 9.

Then, the fixing screw 9 is tightened, and the tip of the fixing screw 9 is pressed against the peripheral surface of the third guide member 8c to fix the respective guide members 8a to 8c. Next, a pipe having the same outer diameter as the inner diameter of the third guide member 8c is inserted into the third guide member 8c, and the tip is rotated while pressing the tip against the cutting edge of the cutting blade. The cutting is performed until the surface comes into contact with the end surface of the third reduced diameter portion 73c to obtain a chamfered pipe.

Then, the third guide is formed in such a state that the mark forming member such as magic is along the edge of the chamfering body 7 or the mark forming tool faces the inside of the chamfering body 7 from the notch 79. By rotating the pipe one or more turns while pressing the tip of the marking line forming tool against the peripheral wall of the pipe in a state in which it is along the edge of the member 8c, the insertion depth into the joint at a predetermined position on the peripheral surface of the pipe. Markers can be entered as a measure of the quality.

When chamfering a pipe having the same outer diameter as the inner diameter of the second guide member 8b, the third guide member 8c is removed, and the tip of the fixing screw 9 is pressed against the peripheral surface of the second guide member 8b. 2 guide member 8b and first guide member 8a
In a state where is fixed, chamfering and marking are similarly performed. When chamfering a pipe having the same outer diameter as the inner diameter of the first guide member 8a, the second guide member 8b is further removed, and the distal end of the fixing screw 9 is pressed against the peripheral surface of the first guide member 8a. With the guide member 8a fixed, chamfering and marking are similarly performed.

When chamfering a tube having the same outer diameter as the inner diameter of the cylindrical recess 71, the first guide member 8a was further removed, and the tip of the fixing screw 9 was retracted until it did not protrude into the cylindrical recess 71. In this state, a pipe is directly inserted into the cylindrical concave portion 7, and chamfering and marking are similarly performed.

As described above, the chamfering device B selects the guide members 8a to 8c according to the diameter of the tube and
When the tube is mounted on the tube, the tube is guided by the guide members 8a to 8c or the inner wall surface of the cylindrical concave portion 71, and the central axis of the tube coincides with the central axis of the cylindrical concave portion 71. Therefore,
The outer edge of the distal end of the tube can be accurately and easily chamfered simply by rotating the tube while pressing it toward the back of the cylindrical concave portion 71.

Further, by using the guide members 8a to 8c, it is possible to chamfer pipes of four different diameters using only the chamfer B. Further, even if a marking line writer is not separately prepared, the marking line can be accurately written as required by the chamfering device B. Further, since all the guide members 8a to 8c can be inserted into the cylindrical concave portion 71, when they are not used, they are not bulky and compact.

The chamfer according to the present invention is not limited to the above embodiment. For example, in the above-mentioned chamfering device B, the guide members 8a to 8c are constituted only by cylindrical tubular portions, but a flange portion may be provided at an end of the tubular portion.

[0051]

Since the chamfer according to the present invention is configured as described above, only one chamfer is prepared.
In addition to being able to handle a plurality of pipes and rods having different diameters, chamfering can be performed easily and accurately. Claim 2
By doing so, the guide member and the chamfer main body are firmly connected, and the workability is further improved.

According to the third aspect, when not in use,
All the guide members can be accommodated in the cylindrical recess, and the chamfer can be made more compact. According to the fourth aspect, since the unused guide member can be held by the holding portion, the unused guide member is not lost.

According to the fifth aspect, not only the chamfering but also the marking of the marking line can be performed accurately and easily on site, and the connection work to the joint such as a pipe can be performed accurately and easily. Become like

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of a chamfer according to the present invention.

FIG. 2 is a plan view of the chamfer of FIG. 1;

FIG. 3 is a half sectional view of the chamfer of FIG. 1;

4 (a) is a plan view, FIG. 4 (b) is a half sectional side view, and FIG. 4 (c) is a view for explaining an example of a marking device. FIG. 3 is a sectional view taken along line XX of FIG.

5A and 5B are diagrams for explaining another example of the marking line marking device, wherein FIG. 5A is a plan view and FIG. 5B is a half sectional view of an exploded state.

FIG. 6 is a plan view showing another embodiment of the chamfer according to the present invention.

FIG. 7 is a side half sectional view of the exploded state of the chamfer of FIG. 6;

8 is an exploded plan view of the chamfer of FIG. 6;

FIG. 9 is a sectional view of a conventional reamer.

FIG. 10 is a perspective view of a conventional scraper.

[Explanation of symbols]

A, B Chamferer 1, 7 Chamferer main body 2a, 2b, 8a, 8b, 8c, 8d Guide member 3, 77 Cutting blade 4 Tube 11, 71 Cylindrical recess 11a, 12a Female thread portion 12 Holding portion 13, 14 , 73a, 73b, 73c Reduced diameter portion 13a, 14a Corner portion 13b, 14b, 71a Bottom 17a, 17b, 76a, 76b, 76c, 76d Notched hole 22, 25 Male screw portion 23, 26, 85, 86, 87 Through hole

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuhiro Okuyama 75 Nojiri, Ritsuto-cho, Kurita-gun, Shiga Prefecture Inside Sekisui Chemical Co., Ltd. (72) Inventor Yoshiaki Hatai 692-1 Sairicho, Hachioji-shi, Tokyo Northeast Giken Kogyo Co., Ltd. F term (reference) 3C045 AA06 CA06 DA04

Claims (5)

[Claims] 1. A cylindrical concave portion for chamfering, having the same central axis as the central axis of the cylindrical concave portion at the back of the cylindrical concave portion, and contracting stepwise from the bottom of the cylindrical concave portion toward the deep side. A surface provided with at least one diameter-reducing portion having a diameter and at least one slit-shaped notch hole facing a part of a corner of the cylindrical concave portion and / or the diameter-reducing portion from the outside is provided on a peripheral wall surface. The take-off device main body is detachably attached to the chamfer body, and is mounted in a state where at least a part thereof is fitted in the cylindrical concave portion, and a through-hole having an inner diameter substantially equal to the outer diameter of the corresponding reduced diameter portion is provided. A chamfering machine comprising: at least one guide member provided; and a cutting blade mounted on the chamfering body such that a cutting edge faces the chamfering body from the notch hole. 2. The chamfer according to claim 1, wherein the guide member is mounted in the cylindrical recess of the chamfer body by screw connection. 3. A small-diameter side guide member having a plurality of guide members is mounted in a cylindrical recess with its through-hole forming portion accommodated in a through hole of a one-size large-diameter guide member. 3. The chamfer according to claim 1 or claim 2, wherein 4. The chamfering apparatus according to claim 1, wherein the chamfering body has a holding portion for a guide member that is not mounted in the cylindrical concave portion. 5. The chamfer body and / or the guide member,
When the tip surface of the pipe or rod is received at the bottom of the cylindrical recess or the bottom of the reduced diameter part, the part that will be the end position of the insertion part into the joint according to the diameter of the pipe or rod is externally exposed, and the marking line is drawn. The chamfering device according to any one of claims 1 to 4, further comprising a guide portion for fixing the tip of the tool to the outer peripheral surface of the pipe or rod.