JP2023170014A - Marking-off jig and method for stamping marking-off line - Google Patents

Abstract

To provide a highly durable and usable marking-off jig capable of easily and accurately stamping a marking-off line on the outer peripheral surface of a pipe body without mixing impurities in the pipe body, and a method for stamping the marking-off line using the same.SOLUTION: This marking-off jig comprises: a plate 2 pressed along one end P3 of a piping PA; a pair of spacers 36, 36 having axes J parallel to the center axis of the piping PA and fitted to the plate 2; and round blades 3 fitted to the spacers 36. The round blades 3 have plan-view disk shapes in which outer peripheral ends are blade parts 31. The blade parts 31 of the round blades 3 come into contact with the outer peripheral surface P1 of the piping PA to stamp a marking-off line K around the outer peripheral surface P1.SELECTED DRAWING: Figure 3A

Description

The present invention relates to a marking jig and a method for marking marking lines using the same.

BACKGROUND ART Conventionally, in plants that use ultra-high purity gas, such as semiconductor manufacturing plants, gas supply piping has generally been constructed using electrolytically polished stainless steel piping. As a method for butting and joining such stainless steel pipes, for example, a method such as automatic TIG (Tungsten Inert Gas) welding is employed.

On the other hand, in methods such as automatic TIG welding, misalignment of the welded part often occurs, so it is required to check whether such misalignment occurs after welding. For this reason, conventionally, for example, a marking line is placed in advance on the outer peripheral surface of the piping to be welded at a position several mm to several tens of mm from the end of the piping using a marking jig for piping. An inspection is performed to visually confirm the presence or absence of misalignment or defects such as dents in the welded portion using this marking line as a reference line (for example, see Patent Document 1).

According to Patent Document 1, there is provided a marking jig for piping that is capable of marking a marking line on the outer peripheral surface of a pipe to be welded while being compatible with a wide range of diameter sizes of the pipe to be welded to be butt welded. It is said that it can be provided.
Further, Patent Document 1 discloses that the distance from the end of the piping to be welded to the position of the marking line can be set while changing at a plurality of distances, and the marking line can be stamped at a desired position on the outer peripheral surface of the piping to be welded. is listed.

In addition, there are three rollers with mutually parallel axes for attaching a part of the pipe wall at the end of the pipe, and an internal roller for holding a scriber etc. in a direction perpendicular to the axis of the rollers. A manual pipe marking jig is known, which is composed of a main body consisting of a cylindrical case having a spring, a roller, a supporting portion of the cylindrical case, and a handle portion (for example, see Patent Document 2). ).

Japanese Patent Application Publication No. 2003-071750 Utility Model Publication No. 55-17753

However, since the scribing jig described in Patent Document 1 uses a scribing needle as a scribing means, there is point contact with the outer circumferential surface of the pipe to be welded, so the tip of the scribing needle is likely to wear out. There was a problem that it lacked durability.
Furthermore, since the scribing jig described in Patent Document 1 uses a scribing needle to scratch the outer circumferential surface of the pipe to be welded, good sliding between the scribing needle and the outer circumferential surface of the pipe to be welded is not guaranteed. There was a problem that the usability was inferior because the

Furthermore, in a manual pipe marking jig as described in Patent Document 2, a roller is brought into contact with the inner circumferential surface of the pipe in order to fix the pipe marking jig. Here, it is necessary to reliably prevent impurities such as dust from entering pipes used in semiconductor manufacturing plants and the like that handle ultra-high purity gas. However, as in the technique described in Patent Document 2, when marking lines are engraved while the roller is in contact with the inner circumferential surface of the pipe, dust and the like adhering to the roller also adhere to the inner circumferential surface of the pipe. There was a problem that this could lead to impurities getting into the pipe.

The present invention has been made in view of the above problems, and it is possible to easily and accurately inscribe marking lines on the outer circumferential surface of a tubular body without introducing impurities into the interior of the tubular body, and it also provides durability and ease of use. The purpose of the present invention is to provide an excellent marking jig and a marking line marking method using the same.

The present inventors have made extensive studies to solve the above problems. As a result, by optimizing the configuration of the marking means that stamps the marking lines on the outer circumferential surface of the tubular body, it is possible to easily and accurately mark the marking lines on the outer circumferential surface of the tubular body without introducing impurities into the inside of the tubular body. The present invention was completed based on the discovery that not only can stamping be performed, but also durability and usability can be improved.
That is, the present invention employs the configuration shown below.

[1] A marking jig for marking a marking line on the outer peripheral surface of a tubular body, which includes a plate that is pressed along the end of the tubular body, and a marking line that is attached to the plate and parallel to the central axis of the tubular body. a pair of spacers having an axis line, and a scribing means attached to at least one of the spacers, the scribing means consisting of a round blade having a disk shape in plan view with an outer peripheral end serving as a blade, A marking jig characterized in that the cutting line of the round blade comes into contact with the outer peripheral surface of the tubular body, thereby imprinting the marking line so as to go around the outer peripheral surface.

[2] The scribing jig as described in [1] above, wherein the round blades are provided in pairs, and the pair of round blades are respectively attached to the pair of spacers.

[3] The scribing jig according to [1] above, wherein the pair of spacers are provided with a variable distance between their axes.

[4] The spacer adjusts the distance from one end of the marking line stamped on the outer peripheral surface of the tubular body by changing the position of the round blade in the axial direction. The scribing jig according to any one of the above features [1] to [3].

[5] One of the pair of spacers is rotatably installed so as to come into contact with the outer circumferential surface of the tubular body and rotate around the outer circumferential surface while rotating synchronously with the tubular body. The marking jig according to [1] above.

[6] The above, wherein one of the pair of spacers is fixed to the plate so as to contact the outer circumferential surface of the tubular body so as to rotate around the outer circumferential surface without rotating. The marking jig according to [1].

[7] The marking jig according to [1] or [2] above, wherein the angle between the axes of the pair of spacers and the central axis of the tubular body is in the range of 10 to 140°. .

[8] A marking line marking method characterized by marking a marking line on the outer peripheral surface of a tubular body using the marking jig according to any one of [1] to [7] above.

According to the marking jig according to the present invention, as described above, the plate is pressed against the end of the tubular body, and the pair of spacers are attached to the plate and have an axis parallel to the central axis of the tubular body. and a scribing means attached to at least one of the spacers, the scribing means comprising a round blade having a disk shape in plan view with an outer peripheral end serving as a blade portion, and the blade portion of the round blade having a tubular shape. By making contact with the outer circumferential surface of the body, a configuration is adopted in which marking lines are engraved so as to go around the outer circumferential surface.
According to the present invention, first, by adopting a configuration including a plate pressed against the end of the tubular body, a spacer attached to this plate, and a scribing means attached to the spacer, the plate While holding the tubular body with the scribing means (and spacer), it becomes possible to stamp a scribing line without bringing a roller or the like into contact with the inner peripheral surface of the tubular body. This prevents dust, dust, etc. from adhering to the inner circumferential surface of the tubular body, and prevents impurities from entering the interior of the tubular body.
In addition, by using a round blade shaped like a disk in plan view as a scribing means, there is a line contact between the blade part of the round blade and the outer circumferential surface of the tubular body, and the pressing force against the outer circumferential surface of the tubular body is uniform and gentle. distributed to As a result, compared to the case where a sharp scribing needle or the like is used, it is possible to suppress wear of the round blade as the scribing line groove is formed shallower.
Further, by using a round blade having a disk shape in plan view, the posture and followability of the round blade with respect to the outer circumferential surface of the tubular body are stabilized. As a result, the position of the marking line stamped on the outer peripheral surface of the tubular body is stabilized without wobbling, and the usability of the marking jig is also improved.
Therefore, it is possible to easily and accurately mark the marking lines on the outer peripheral surface of the tubular body without introducing impurities into the interior of the tubular body, and it is also possible to provide a marking jig that is highly durable and easy to use. becomes.

Furthermore, according to the marking line marking method according to the present invention, since the marking line is stamped using the above-mentioned marking jig according to the present invention, the marking line can be marked without mixing impurities into the inside of the tubular body, as described above. It becomes possible to easily and accurately inscribe marking lines on the outer circumferential surface of the tubular body.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically explaining a scribing jig according to a first embodiment of the present invention, and is a perspective view schematically showing a state in which the scribing jig is viewed from the surface side on which a tubular body is set. 1A is a diagram schematically explaining a scribing jig according to a first embodiment of the present invention, and is a perspective view schematically showing a state of the scribing jig shown in FIG. 1A viewed from the back side. FIG. FIG. 2 is a diagram schematically explaining a marking jig and marking line marking method according to a second embodiment of the present invention, in which a tubular body is set in the marking jig and a marking line is stamped on the outer peripheral surface of the tubular body. FIG. 2 is a perspective view schematically showing the scribing jig as viewed from the surface side on which the tubular body is set. 2A is a diagram schematically illustrating a marking jig and marking line marking method according to a second embodiment of the present invention, in which a tubular body is set in the marking jig shown in FIG. 2A, and the outer peripheral surface of the tubular body is marked. It is a figure which shows the procedure of marking a line, and is a perspective view which shows the state which roughly shows the state where the marking jig was seen from the back side opposite to the front side where the tubular body was set. 1 is a diagram schematically explaining a marking jig and marking line marking method according to the first embodiment of the present invention, in which a large-diameter tubular body is set in the marking jig shown in FIGS. 1A and 1B, and a tubular body is formed. FIG. 3 is a schematic perspective view showing a procedure for marking a marking line on the outer circumferential surface of a body. 1A and 1B are diagrams schematically explaining a marking jig and a marking method for marking lines according to the first embodiment of the present invention, in which a small-diameter tubular body is set in the marking jig shown in FIGS. 1A and 1B, and the tubular body is FIG. 3 is a schematic perspective view showing a procedure for marking a marking line on the outer circumferential surface of the holder. 1 is a diagram schematically explaining a marking jig and marking line marking method according to the first embodiment of the present invention, in which a tubular body with a small diameter (φ25.4 mm) is attached to the marking jig shown in FIGS. 1A and 1B. FIG. 7 is a schematic plan view showing the angle between the axes of a pair of spacers and the central axis of the tubular body when the spacers are set and a marking line is stamped on the outer peripheral surface of the tubular body. It is a diagram schematically explaining a marking jig and marking line marking method according to the first embodiment of the present invention, and a tubular body of 150A (nominal A) is set in the marking jig shown in FIGS. 1A and 1B. FIG. 3 is a schematic plan view showing the angle in plan view between the axes of a pair of spacers and the central axis of the tubular body when marking lines are stamped on the outer circumferential surface of the tubular body. It is a diagram schematically explaining a marking jig and marking line marking method according to the first embodiment of the present invention, and a tubular body of 300A (nominal A) is set in the marking jig shown in FIGS. 1A and 1B. FIG. 3 is a schematic plan view showing the angle in plan view between the axes of a pair of spacers and the central axis of the tubular body when marking lines are stamped on the outer circumferential surface of the tubular body. 1 is a diagram schematically illustrating a marking jig and a method of marking a marking line according to a first embodiment of the present invention, and is a diagram schematically illustrating a marking jig and a method of marking a marking line according to a first embodiment of the present invention, and is a diagram schematically illustrating a marking jig and a marking method of a marking line according to a first embodiment of the present invention. It is a schematic plan view showing distance. 1A and 1B are diagrams schematically explaining a marking jig and a marking method for marking lines according to the first embodiment of the present invention, in which a tubular body is set in the marking jig shown in FIGS. 1A and 1B, and the outer periphery of the tubular body is FIG. 7 is a schematic perspective view showing a state in which the tubular body is supported at three points by two points of a pair of round blades and a plate when marking lines are stamped on a surface. It is a diagram schematically explaining the marking jig and the marking method of marking lines according to the first embodiment of the present invention, and shows three points: one point of a round blade provided alone, one point of a spacer, and one point of a plate. FIG.

Hereinafter, a marking jig according to an embodiment of the present invention and a method of marking a marking line using the same will be described with reference to FIGS. 1A and 1B to 5A and 5B as appropriate.
Note that in the drawings used in the following description, characteristic parts may be shown enlarged or simplified for convenience in order to make the characteristics easier to understand. Furthermore, the materials and the like exemplified in the following description are merely examples, and the present invention is not limited thereto, and can be implemented with appropriate changes within the scope of the gist thereof.

The marking jig and marking line marking method of the present embodiment can be used, for example, to check the presence or absence of misalignment in the welded part of a pipe (tubular body) whose ends are butt-welded by a method such as automatic TIG welding. It is used to stamp marking lines for later confirmation. In this case, for example, mark the outer peripheral surface of the pipe to be welded in advance using a piping marking jig at a position several mm to several tens of mm from the end of the pipe (for example, about 15 mm). Mark the line. After welding, an inspection is performed using the marking line as a reference line to visually confirm the presence or absence of misalignment and the presence or absence of defects such as dents in the welded part.

<First embodiment>
Below, the marking jig according to the first embodiment of the present invention and the marking method of marking lines using the same will be explained in detail with reference to FIGS. 1A and 1B, and 3A and 3B to 5A and 5B. explain.
FIG. 1A is a schematic perspective view of the marking jig 1 of the present embodiment viewed from the surface 2a side of the plate 2 on which the piping (tubular body) PA is set, and FIG. 1B is the marking jig 1 shown in FIG. 1A. 1 is a schematic perspective view of the plate 2 when viewed from the back side 2b of the plate 2. FIG.
Further, FIG. 3A is a schematic perspective view showing a procedure for setting a large diameter pipe PA in the marking jig 1 shown in FIGS. 1A and 1B and marking a marking line K on the outer peripheral surface P1 of the pipe PA. FIG. 3B is a schematic perspective view showing a procedure for setting a small-diameter pipe (tubular body) PB in the marking jig 1 and marking a marking line K on the outer peripheral surface P1 of the pipe PB.
Moreover, FIG. 4A shows a pair of marking lines K when setting a small diameter (φ25.4 mm) pipe PB in the marking jig 1 shown in FIGS. 1A and 1B and marking a marking line K on the outer peripheral surface P1 of the pipe PB. FIG. 7 is a schematic plan view showing the angle in plan view between the axis J of the provided spacers 36, 36 and the central axis P4 of the piping PB. In addition, FIG. 4B shows a case where a 150A (nominal A) piping PC is set on the marking jig 1 and a marking line K is stamped on the outer peripheral surface P1 of the piping PC, and FIG. 4C shows a case where a 300A (nominal A) piping PC is set on the marking jig 1 When setting the piping PD in A) and stamping the marking line K on the outer peripheral surface P1 of the piping PD, the distance between the axis J of the pair of spacers 36, 36 and the central axis P4 of the piping PA, PC. FIG. 3 is a schematic plan view showing a plan view angle. Moreover, FIG. 4D is a schematic plan view showing the distance between the axes J of the pair of spacers 36, 36 in the scribing jig 1 shown in FIGS. 1A and 1B.
Moreover, FIG. 5A shows a pair of round blades 3a, which are used when setting the piping PB in the scribing jig 1 shown in FIGS. 1A and 1B and marking a scribing line K on the outer peripheral surface P1 of the piping PB. 5B is a schematic perspective view showing a state in which the piping PB is supported at three points by the two points 3b and the plate 2, and FIG. FIG. 2 is a schematic perspective view showing a state in which the pipe PB is supported at three points according to FIG.

[Structure of marking jig]
As shown in FIGS. 1A and 1B, the scribing jig 1 of this embodiment has a round blade 3a (3b) that is a scribing means that comes into contact with the outer peripheral surface P1 of the pipe (tubular body) P. A marking line K is stamped on the outer peripheral surface P1 of the pipe PA or the pipe PB shown in FIG. 3B.

As shown in FIGS. 1A and 1B, the marking jig 1 of this embodiment includes a plate 2 that is pressed along one end (end) P3 of a pipe PA, and a marking jig 1 that is attached to the plate 2 and that is attached to the central axis of the pipe P. It has a pair of spacers 36, 36 having an axis J parallel to P4, and a round blade 3 attached to one of the spacers 36. Furthermore, in the example described in this embodiment, the above-mentioned round blades 3 are provided as a pair of round blades 3a and 3b, and each of the round blades 3a and 3b is attached to one of the pair of spacers 36 and 36. There is. In the scribing jig 1 of the present embodiment, the pair of round blades 3a, 3b are configured in a disk shape in a plan view with the outer peripheral end serving as a blade portion 31, and each of the pair of round blades 3a, 3b has a circular shape. When the blade parts 31, 31 come into contact with the outer circumferential surface P1 of the pipe PA, a marking line K is imprinted so as to go around the outer circumferential surface P1 (see also FIGS. 3A and 3B).

Further, in the marking jig 1 shown in FIGS. 1A and 1B, a pair of spacers 36, 36 are arranged along an axis J parallel to the central axis P4 of the piping PA, and a pair of spacers 36, 36 are attached to the pair of spacers 36, 36. The round blades 3a and 3b are also arranged along parallel axes J, as described above.
As will be described in detail later, the illustrated marking jig 1 has a structure in which the pipe PA can be held when marking the marking line K by supporting the pipe PA with a plate 2 and a pair of round blades 3a and 3b. ing.

As described above, the plate 2 is pressed against one end P3 of the pipe PA when marking the marking line K on the outer peripheral surface P1 of the pipe PA, and the plate 2 and the pair of round blades 3a, 3b is configured to hold the pipe PA. The plate 2 also functions as a casing, that is, a base plate, for the scribing jig 1 of this embodiment, and is used, for example, to drill holes or process corners of a metal block having a predetermined thickness. , made of a member that has been subjected to surface treatment, etc. The plate 2 in the illustrated example has a generally rectangular shape with four corners cut in plan view when viewed from the front surface 2a side or the back surface 2b side.

Furthermore, a pair of slit holes 21 are formed in the plate 2 for movably attaching a pair of spacers 36 , 36 . In the illustrated example, two horizontally elongated slit holes 21, 21 are arranged parallel to the upper surface 2c of the plate 2 in the vicinity of the upper surface 2c, and are symmetrical in plan view. It is located.

The material of the plate 2 is not particularly limited, and any metal material conventionally used in this field, such as stainless steel or aluminum, can be used without any restriction.
The shape of the plate 2 in plan view is not particularly limited, and may be a shape that can stably abut against one end P3 of the piping PA and that is easy for the user of the scribing jig 1 to grasp, for example, the illustrated example. In addition to the rectangular shape with corner-cut corners, it is also possible to adopt a rectangular shape with rounded corners, a round shape, etc.
In addition, the plan view dimensions and thickness dimensions of the plate 2 are not particularly limited, and are determined to be dimensions that are easy for the user of the scribing jig 1 to grasp, as described above, while taking into account ensuring the strength of the casing. All you have to do is stay there.

As described above, the pair of round blades 3a and 3b are for marking the marking line K on the outer circumferential surface P1 of the pipe PA, and although detailed illustration is omitted in FIGS. 1A and 1B, when viewed from above, It is configured in a disk shape, and the outer peripheral end thereof is a blade portion 31 that contacts the outer peripheral surface P1 of the pipe PA. Further, the pair of round blades 3a and 3b in the illustrated example are provided with a through hole (not shown) arranged coaxially with the axis J in the base 32 centered on the axis J. Further, the pair of round blades 3a and 3b in the illustrated example are formed to be thinner at the outer peripheral side including the blade portion 31 than at the base portion 32 near the axis J.

Further, as shown in FIGS. 1A and 1B, in the marking jig 1 of this embodiment, the two spacers 36, 36 provided in a pair correspond to the pair of slit holes 21, 21 on the plate 2. It is attached so that it can slide in the horizontal direction of the pair of slit holes 21, 21 at the position shown in FIG. That is, in the illustrated example, the distance between the respective axes J (distance between centers) of the pair of spacers 36, 36 with respect to the pair of slit holes 21, 21 is the same as that of the pair of slit holes 21, 21, respectively. 21 is provided to be variable in the horizontal direction.

Specifically, in the illustrated example, the pair of round blades 3a, 3b are each attached to the plate 2 with a bolt 37 with a spacer 36 interposed between them and the surface 2a of the plate 2. At this time, the intermediate portions of the threaded portions of the two bolts 37 are inserted into the slit holes 21, 21 provided in a pair in the plate 2 in a state where they can slide in the horizontal direction without being screwed. At the same time, the tip portion is screwed into the nut 38.
As described above, the pair of round blades 3a, 3b are attached to the surface 2a of the plate 2 via the spacer 36, so that the positions of the pair of round blades 3a, 3b in the direction of the axis J are changed. can.

With the above configuration, the scribing jig 1 of this embodiment can change the position of each of the pair of round blades 3a, 3b to any position in the horizontal direction of the pair of slit holes 21, 21. For example, if the piping to be marked with the marking line K has a relatively small diameter, one round blade 3a and the other round blade 3a are placed near the center between the pair of slit holes 21, 21. Attach the round blade 3b. On the other hand, if the piping to be marked with the marking line K has a relatively large diameter, one of the round blades 3a is placed at a position spaced apart from the center between the pair of slit holes 21, 21. and attach the other round blade 3b.

As mentioned above, by changing the distance between the axis J of one round blade 3a and the other round blade 3b according to the size (diameter) of the piping to be marked with the marking line K, the pair of round blades Since the pipes can be set so that the pipes 3a and 3b uniformly abut against the outer peripheral surface of the pipes, it is possible to accommodate pipes of various sizes.

The material of each of the pair of round blades 3a and 3b is not particularly limited, and general tool steel can be used without any restrictions. Specifically, for example, high speed steel or carbide material can be used. can.
High-Speed Steel, also called super-speed steel, compensates for the low softening resistance of common tool steels at high temperatures and enables metal materials to be cut at higher speeds. Therefore, when it is used as the material for the pair of round blades 3a and 3b, marking lines can be more easily and accurately marked.
In addition, cemented carbide is a so-called cemented carbide, which is manufactured by sintering tungsten carbide, cobalt, nickel, etc., and has properties similar to ceramics, so it can be used for steel-based materials such as the high-speed steel mentioned above. Although the properties are significantly different from the above, by adopting the material for the pair of round blades 3a and 3b, marking lines can be marked more easily and accurately.
Note that, for example, the pair of round blades 3a and 3b may be made of different materials.

The outer diameter of each of the pair of round blades 3a, 3b is not particularly limited, but from the viewpoint of ensuring line contact with the outer circumferential surface P1 of the pipe PA, it is preferably about 5 to 50 mm, and more preferably 10 to 30 mm. .

The spacer 36 is not particularly limited, and for example, a cylindrical member made of resin or metal can be used without any restriction.
The scribing jig 1 of this embodiment includes the spacer 36 described above, and by appropriately changing the spacers 36 to have different lengths, the position of the pair of round blades 3a, 3b in the axis J direction, that is, the position of the pair of round blades 3a, 3b, It becomes possible to change the distance of the blades 3a, 3b from the surface 2a of the plate 2. Thereby, it becomes possible to adjust the distance from the one end P3 of the piping PA to the marking line K stamped on the outer circumferential surface P1 of the piping PA.

The outer diameter of the spacer 36 is not particularly limited, but may be slightly smaller than the outer diameter of the round blade 3 in order to prevent the spacer 36 from interfering with the outer circumferential surface P1 of the pipe PA during scribing work. preferable.

In addition, in this embodiment, although the structure in which the blade part 31 of a pair of round blades 3a and 3b is completely exposed is demonstrated, it is not limited to this. For example, a configuration may be adopted in which a pair of round blades are covered by a cover (not shown), and only the position necessary for marking the piping is exposed by an arc-shaped cutout formed in the cover. is also possible.
The cover used in such a case is not particularly limited, and for example, a cover made of resin or metal may be appropriately employed while taking into account its processability.
Note that the arc-shaped notch formed in the pair of covers (not shown) is, for example, the outer peripheral surface P1 of the pipe PA in the pair of round blades 3a, 3b when the pipe PA is set in the scribing jig 1. It is preferable to arrange the pipe PA so as to correspond to the position where it comes into contact with the pipe PA, from the viewpoint of avoiding interference between the pipe PA and the cover (not shown).

In the scribing jig 1 of the embodiment, by adopting a configuration in which the round blades 3a, 3b as described above are provided as a pair, as shown in FIG. 5A, the pair of round blades 3a, 3b and the surface of the plate 2. Piping PB can be supported by three-point support with 2a. In the illustrated example, the pipe PB is supported at three points: a contact C1 between the round blade 3a and the pipe PB, a contact C2 between the round blade 3b and the pipe PB, and a contact C3 between the surface 2a of the plate 2 and the pipe PB. ing. This stabilizes the holding posture of the pipe PB when setting the pipe PB in the marking jig 1 and marking the marking line K on the outer circumferential surface P1, making it possible to perform stable marking work.

Further, in this embodiment, it is possible to adopt a configuration having only one round blade 3, and even with such a configuration, it is possible to stamp a marking line on the outer circumferential surface of the pipe. . On the other hand, in such a case, the piping PB is supported at three points by one round blade 3, the spacer 36, and the plate 2, as in the example shown in FIG. 5B. In the illustrated example, the pipe PB is supported at three points: a contact C1 between the round blade 3a and the pipe PB, a contact C3 between the surface 2a of the plate 2 and the pipe PB, and a contact C4 between the spacer 36 and the pipe PB. In this case, there is no particular restriction on the length in the axis J direction of the spacer 36 with the round blade 3a attached and the spacer 36 without the round blade 3a attached, as long as the pipe PB can be supported at three points along with the plate 2. , may be the same length or may be different lengths.
In addition, if there is only one round blade 3, the marking line K stamped on the outer peripheral surface P1 of the pipe PB may appear too thin, resulting in a slight decrease in visibility. From these viewpoints, it is more preferable that a pair of round blades 3 be provided.

Further, the material of the spacer 36 is not particularly limited, but from the viewpoint of preventing the piping P from being damaged, it is preferably a material that is softer than the material of the piping to be marked.

Here, in the example shown in FIG. 5B, one of the pair of spacers 36, 36 comes into contact with the outer circumferential surface P1 of the pipe PB, so that it rotates around the outer circumferential surface P1 while rotating in synchronization with the pipe PB. , which is rotatably installed.
On the other hand, in this embodiment, one of the pair of spacers 36, 36 is fixed to the plate 2 so as to rotate around the outer circumferential surface P1 without rotation by contacting the outer circumferential surface P1 of the piping PB. It is also possible to adopt the configuration described above.
As mentioned above, when the spacer 36 is fixed to the plate 2 and does not rotate, the material of the spacer 36 may be brass, resin, aluminum, etc., from the viewpoint of preventing damage to the piping PB. It is preferable to use the following.

In addition, in the marking jig 1 of this embodiment, as shown in FIGS. 4A, 4B, and 4C, the axis J of each of the pair of spacers 36, 36 and the central axis of each piping PB, PC, PD The angle H with respect to P4 is not particularly limited.
On the other hand, in this embodiment, the angle H shown in FIGS. 4A, 4B, and 4C is preferably 10 to 140 degrees, more preferably 15 to 120 degrees, and preferably 20 to 90 degrees. is more preferable, and most preferably 22.5° to 45°.

The angle H between the axis J of the pair of spacers 36, 36 as described above and the central axis P4 of the pipes PB, PC, PD is determined by the angle H between the axis J of the pair of spacers 36, 36 and the central axis P4 of the pipes PB, PC, PD. This can be adjusted by changing the distance W between the axes J of the pair of spacers 36, 36.
In the example shown in FIG. 4A, when supporting the small-diameter pipe PB, the angle H is set to 22 by setting the distance W between the axes J of the pair of round blades 3a, 3b and the pair of spacers 36, 36 to be narrow. The angle is adjusted to .5° or 45°.
In addition, in the example shown in FIG. 4B, in order to support a thick pipe PC with a nominal A of 150A, the distance W between the axes J of the pair of round blades 3a, 3b and the pair of spacers 36, 36 is slightly increased. By setting this, the angle H is adjusted to 22.5° or 45°.
Furthermore, in the example shown in FIG. 4C, when supporting the extremely thick pipe PD with a nominal A of 300A, the distance W between the respective axes J of the pair of round blades 3a, 3b and the pair of spacers 36, 36 is greatly reduced. By setting it wide, the angle H is adjusted to 22.5° or 45°.
In each example shown in FIGS. 4A, 4B, and 4C, the vertical dimension of the plate 2 of the scribing jig 1 in plan view is 50 mm, and the horizontal dimension is 80 mm.

Since the angle between the axis J of the pair of round blades 3a, 3b and the pair of spacers 36, 36 and the central axis P4 of the piping PB, PC, PD is within the above range, the piping PB, Since the PC and PD can be held, the scribing work can be stabilized.

According to the marking jig of this embodiment, as described above, first, the plate 2 pressed against the one end P3 of the pipe PA, the pair of spacers 36, 36 attached to this plate 2, and the pair of spacers 36, 36 attached to this plate 2, By adopting a configuration in which the plate 2 and the round blade 3a (and the spacer 36) can hold the pipe PA, the plate 2 and the round blade 3a (and the spacer 36) can hold the pipe PA. It becomes possible to stamp the marking line K without bringing a roller or the like into contact with the peripheral surface P2. This prevents dust, dust, etc. from adhering to the inner circumferential surface P2 of the pipe PA, so that it is possible to prevent impurities from entering the inside of the pipe PA.

Further, the surface 2a of the plate 2 is pressed against one end of the pipe PA, and the pair of round blades 3a, 3b or the round blade 3a and the spacer 36 are brought into contact with the outer peripheral surface P1 of the pipe PA, so that the plate 2 and the pair of round blades are brought into contact with the outer peripheral surface P1 of the pipe PA. By adopting a configuration in which the pipe PA is held by the blades 3a, 3b or the round blade 3a and the spacer 36, the posture and operation when marking the marking line K on the outer peripheral surface P1 of the pipe PA are stabilized. . Further, since the distance between the respective axes J of the pair of round blades 3a, 3b and the pair of spacers 36, 36 is variable in the horizontal direction of the pair of slit holes 21, 21, FIG. As in the example shown in FIG. 3B, even when using either the piping PA or the piping PB having different outer diameters and/or inner diameters, it is possible to easily adjust and cope with the situation.

Furthermore, when a pair of round blades 3a, 3b which are disk-shaped in plan view are used as the scribing means, there is a line contact between the blade portions 31 of these pair of round blades 3a, 3b and the outer circumferential surface P1 of the pipe PA. An effect is obtained in which the pressing force on the outer circumferential surface P1 of the pipe PA is uniformly and gently distributed. As a result, the groove of the scribing line K is formed shallower than when a sharp scribing needle or the like is used, so that the effect of suppressing the wear of each of the pair of round blades 3a and 3b can be obtained. .

In addition, when a pair of round blades 3a, 3b having a disk shape in plan view is used, the posture and followability of the pair of round blades 3a, 3b with respect to the outer circumferential surface P1 of the pipe PA are stable, so the outer circumference of the pipe PA The position of the marking line K stamped on the surface P1 is stabilized without wobbling, and the usability of the marking jig 1 is also improved. Furthermore, when the pair of round blades 3a and 3b are used as the marking means, the marking line K can be engraved at any position on the blade part 31, which is the outer peripheral edge, so there is an advantage that it can be used for a long time. .

Therefore, according to the marking jig 1 of the present embodiment, it is possible to easily and accurately mark the marking line K on the outer circumferential surface P1 of the pipe PA without introducing impurities into the inside of the pipe PA, and the marking jig 1 has a high durability. It is also possible to provide a marking jig 1 that is easy to use.

In addition, in the scribing jig 1 of this embodiment, when the pair of round blades 3a, 3b are fixed without rotation, the pair of round blades 3a, 3b contact the outer circumferential surface P1 without rotating. By doing so, the marking line K can be stamped as a shallow groove on the outer peripheral surface P1.

On the other hand, in this embodiment, the pair of round blades 3a, 3b are rotatable, and these round blades 3a, 3b rotate in synchronization with the pipe PA while contacting the outer circumferential surface P1 of the pipe PA. It is also possible to adopt a configuration in which marking lines K are stamped on the outer peripheral surface of the PA.
As described above, since the pair of round blades 3a, 3b are rotatable, the marking line K stamped on the outer circumferential surface P1 of the pipe PA can be reduced compared to when the pair of round blades 3a, 3b do not rotate. Since it is formed as a deep groove, it is effective when it is desired to form the marking line K deeply.
On the other hand, in consideration of the durability and lifespan of the pair of round blades 3a and 3b, if it is desired to form the marking line K engraved on the outer circumferential surface P1 of the piping PA as shallowly as possible, the pair of round blades 3a and 3b can be used as described above. , 3b may be fixed without rotation.
Note that even when one round blade 3a is used, it may be fixed to the spacer 36 without rotating, or may be rotatably installed.

Moreover, in this embodiment, for example, one of the round blades 3a, 3b of the pair of round blades 3a, 3b is rotatable, and rotates synchronously with the pipe PA while contacting the outer circumferential surface P1 of the pipe PA. While marking the marking line K on the outer peripheral surface P1 of the piping PA, the other round blade 3b contacts the outer peripheral surface P1 of the piping PA without rotating, thereby marking the marking line K on the outer peripheral surface P1 of the piping PA. It may also be a configuration.
In such a configuration, one of the pair of round blades 3a, 3b, which is rotatable, is a marking line formed of a relatively deep groove with respect to the outer circumferential surface P1 of the pipe PA. On the other hand, the other round blade 3b, which is fixed without rotation, acts to stamp a marking line K consisting of a relatively shallow groove on the outer circumferential surface P1 of the pipe PA. Thereby, it becomes possible to form the marking line K stamped on the outer circumferential surface P1 of the pipe PA while adjusting the groove to have an optimum depth.

Further, in the scribing jig 1 of this embodiment, dedicated parts may be manufactured and used as the pair of round blades 3a and 3b, but it is also possible to use commercially available pipe cutter blades. In this case, for example, by adjusting the pressing force on the pipe PA by the pair of round blades 3a, 3b, it is possible to optimally prevent the marking line K stamped on the outer peripheral surface P1 of the pipe PA from becoming too deep. It is preferable to engrave the marking line K while marking.

[How to mark the marking line]
The marking method of marking lines according to this embodiment will be explained mainly with reference to FIGS. 3A and 3B (see also FIGS. 1A and 1B as appropriate).
The marking line marking method of this embodiment is a method of marking marking lines K on the outer circumferential surface P1 of the pipe PA or the pipe PB using the marking jig 1 of this embodiment described above.

First, by checking and adjusting the size of the spacer 36 and determining the positions of the pair of round blades 3a and 3b, the position where the marking line K should be formed on the outer peripheral surface P1 of the pipe PA or the pipe PB is determined. , Set the piping PA or PB to be marked with the marking line K on the surface 2a side of the plate 2.
At this time, a part of the cylindrical wall constituting the pipe PA or the pipe PB is arranged between one round blade 3a and the other round blade 3b, and one end P3 of the pipe PA or the pipe PB is placed on the surface of the plate 2. Set it so that it touches 2a.

Next, by moving the respective positions of the pair of round blades 3a, 3b along the pair of slit holes 21, 21, a part of the cylindrical wall constituting the piping PA or the piping PB is cut into one of the round blades. 3 and the other round blade 3b. At this time, each blade portion 31 of the pair of round blades 3a, 3b is in contact with the outer peripheral surface P1 of the pipe PA or the pipe PB. Then, by tightening the bolt 37 and nut 38, the positions of the pair of round blades 3a, 3b are fixed.

Next, while holding the piping PA or the piping PB with the pair of round blades 3a, 3b and the surface 2a of the plate 2, the piping is removed by rotating the entire scribing jig 1 or by rotating the piping PA or the piping PB. A marking line K is stamped on the outer circumferential surface P1 of PA or piping PB using a pair of round blades 3a and 3b. At this time, it is more preferable to reliably stamp the marking line K on the outer circumferential surface P1 of the pipe PA or pipe PB, for example, by rotating the pipe PA or pipe PB or the marking jig 1 multiple times.

Next, the piping PA or the piping PB is removed from the scribing jig 1 by loosening the bolt 37 and the nut 38 or by shifting the piping PA or the piping PB in the direction away from the pair of round blades 3a, 3b. .
By the above procedure, the marking line K can be stamped at a desired position on the outer circumferential surface P1 of the pipe PA or the pipe PB.

According to the marking method of the marking line K of this embodiment, since the marking line K is marked using the marking jig 1 of this embodiment described above, impurities may be mixed into the inside of the pipe PA or the pipe PB as described above. It becomes possible to easily and accurately mark the marking line K on the outer circumferential surface P1 of the pipe PA or the pipe PB without causing any damage.

<Second embodiment>
Below, the configuration of a scribing jig according to a second embodiment of the present invention will be described in detail with reference to FIGS. 2A and 2B.
In addition, in the description of the marking jig 1A of this embodiment shown below, the same structure as the marking jig 1 of the first embodiment shown in FIGS. 1A and 1B and FIGS. 3A and 3B will be the same. Reference numerals may be given and the same drawings may be referred to, and detailed description thereof may be omitted.

FIG. 2A is a plan view showing a procedure for setting the piping PA on the surface 2a side of the plate 2A in the marking jig 1A of this embodiment and marking a marking line K on the outer circumferential surface P1 of the piping PA. FIG. 2B is a perspective view showing the marking jig 1A viewed from the surface 2a side where the piping PA is set, and FIG. FIG.

As shown in FIGS. 2A and 2B, the marking jig 1A of this embodiment includes a plate 2A pressed along one end (end) P3 of the pipe PA, a pair of spacers 36 attached to this plate 2A, 36, and a pair of round blades 3a, 3b which are attached to the pair of spacers 36, 36 and come into contact with the outer peripheral surface P1 of the piping PA, and which have a disk shape in plan view and whose outer peripheral end is the blade part 31. In this respect, it is similar to the scribing jig 1 of the first embodiment shown in FIGS. 1A and 1B and FIGS. 3A and 3B.
On the other hand, the marking jig 1A of this embodiment has bolt holes 22 (22a, 22b, 22c, 22d), 23 for attaching a pair of spacers 36, 36 and a pair of round blades 3a, 3b to the plate 2A. (23a, 23b, 23c, 23d) are provided at a total of 8 locations, 4 locations each corresponding to one round blade 3a and the other round blade 3b. This differs from the marking jig 1 of the first embodiment in which slit holes 21, 21 are provided.
In addition, in the marking jig 1A of this embodiment, one round blade 3a is fixed to any one of the bolt holes 22a, 22b, 22c, and 22d in the plate 2A via a spacer 36, and the other round blade 3b is fixed to any one of the bolt holes 23a, 23b, 23c, 23d via the spacer 36, and the pair of round blades 3a, 3b are fixed to the pair of bolt holes 23a, 23b, 23c, 23d via the spacer 36. This differs from the scribing jig 1 of the first embodiment, which is slidably attached to the slit holes 21, 21 of the first embodiment.

The plate 2A has a total of four bolt holes 22 (22a, 22b, 22c, 22d) and a total of four bolt holes 23 (23a, 23b, 23c, 23d) near the top surface 2c of the plate 2A. The four bolt holes 22 and four bolt holes 23 are arranged in parallel with the upper surface 2c, and are arranged in a row at positions that are symmetrical in plan view.

One round blade 3a is inserted into one of the bolt holes 22a, 22b, 22c, and 22d formed in the plate 2A by a bolt 37 with a spacer 36 interposed between it and the surface 2a of the plate 2A. It is attached. On the other hand, the other round blade 3b is attached to any one of the bolt holes 23a, 23b, 23c, and 23d with a bolt 37, with a spacer 36 interposed between it and the surface 2a of the plate 2A, as described above.
At this time, the intermediate portions of the threaded portions of the two bolts 37 are inserted into the bolt holes 22 and bolt holes 23, which are provided at four locations each in the plate 2A, in a freely rotatable state without being screwed. At the same time, the tip portion is screwed into the nut 38.

In the scribing jig 1A of this embodiment, one of the round blades 3a is attached to the plate 2A at one of the four bolt holes 22a, 22b, 22c, and 22d, and the other round blade 3b can be attached to any one of the four bolt holes 23a, 23b, 23c, and 23d. That is, in the marking jig 1A of the present embodiment, the mounting positions of the pair of round blades 3a, 3b can be changed, for example, in a total of four patterns according to the size (diameter) of the piping on which the marking line K is to be marked.

In the example shown in FIGS. 2A and 2B, one round blade 3a has two bolt holes 22 and four bolt holes 23, counting from the center side on the plate 2, which is arranged in pairs at four locations. It is fixed at the position of the second bolt hole 22b. Similarly, the other round blade 3b is positioned at the second bolt hole 23b, counting from the center side on the plate 2, where bolt holes 22 and bolt holes 23 are arranged in pairs at four locations. Fixed.

Here, for example, if the piping to be marked with the marking line K has a smaller diameter than the piping PA in the illustrated example, one of the round blades 3a is inserted into the bolt hole 22a located near the center of the plate 2. Similarly, the other round blade 3b is fixed to a bolt hole 23a located near the center of the plate 2. Thereby, the piping can be set so that the pair of round blades 3a, 3b uniformly abut against the outer peripheral surface of the piping.
On the other hand, if the piping to be marked with the marking line K has a larger diameter than the piping PA in the illustrated example, one of the round blades 3a is placed away from the center position on the plate 2. Similarly, the other round blade 3b is fixed to a bolt hole 23c or bolt hole 23d located on the plate 2 at a distance from a position near the center.
With the above-described configuration, the marking jig 1A of the present embodiment has one round blade 3a and one round blade 3a according to the size (diameter) of the piping to be marked with the marking line K, similar to the marking jig 1 of the first embodiment. By changing the distance between the axis J and the other round blade 3b, it becomes possible to accommodate piping of various sizes.

According to the marking jig 1A of the present embodiment, by having the above-mentioned configuration, as with the marking jig 1 of the first embodiment, the marking jig 1A can be applied to the outer circumferential surface P1 of the pipe PA without introducing impurities into the inside of the pipe PA. The marking line K can be marked easily and accurately, and the durability and usability are improved.

<Other forms>
Although an example of the marking jig according to the present invention and the method of marking a marking line using the same has been described above in accordance with the embodiment, the present invention is not limited to the above-described embodiment. The configurations and combinations thereof in the above embodiments are merely examples, and additions, omissions, substitutions, and other changes to the configurations are possible without departing from the spirit of the present invention.

<Effect>
As explained above, according to the marking jig 1 (1A) of the present embodiment, the plate 2 (2A) that is pressed along one end P3 of the piping PA (PB, PC, PD), and the plate 2 ( It has a pair of spacers 36, 36 attached to the plate 2 (2A) and a round blade 3 (a pair of round blades 3a, 3b) which is a scribing means attached to the spacer 36, and a pair of spacers 36, 36 attached to the plate 2 (2A) A configuration is adopted in which the pipe PA (PB) can be held by the blades 3a and 3b (as well as the spacer 36). By employing such a configuration, it becomes possible to stamp the marking line K on the inner circumferential surface P2 of the pipe PA (PB) without bringing a roller or the like into contact with it. This prevents dust, dust, etc. from adhering to the inner circumferential surface P2 of the pipe PA (PB), so that it is possible to prevent impurities from entering the inside of the pipe PA (PB).
In addition, by using the round blade 3 (a pair of round blades 3a, 3b) which is disk-shaped in plan view as a scribing means, the blade part 31 of the round blade 3 (a pair of round blades 3a, 3b) and the pipe PA (PB, There is a line contact between the outer circumferential surface P1 of the piping PA (PB) and the outer circumferential surface P1 of the pipe PA (PB), and the pressing force on the outer circumferential surface P1 of the pipe PA (PB) is uniformly and gently distributed. This prevents the round blade 3 (a pair of round blades 3a, 3b) from wearing out as the groove of the scribing line K is formed shallower than when using a sharp scribing needle or the like. can.
In addition, when a pair of round blades 3a, 3b having a disk shape in plan view is used, the posture and followability of the pair of round blades 3a, 3b with respect to the outer circumferential surface P1 of the piping PA (PB, PC, PD) are stable. Therefore, the position of the marking line K stamped on the outer circumferential surface P1 of the piping PA (PB, PC, PD) is stabilized without wobbling, and the usability of the marking jig 1 (1A) is also improved.
Therefore, the marking line K can be easily and accurately engraved on the outer peripheral surface P1 of the piping PA (PB, PC, PD) without introducing impurities into the interior of the piping PA (PB, PC, PD). It becomes possible to provide a scribing jig 1 (1A) with excellent durability and ease of use.

Furthermore, according to the marking method of the marking line K of this embodiment, since the marking line K is marked using the marking jig 1 (1A) of this embodiment described above, the marking line K is marked using the marking jig 1 (1A) of the embodiment described above. , PD), it becomes possible to easily and accurately mark the marking line K on the outer peripheral surface P1 of the pipe PA (PB, PC, PD).

According to the marking jig of the present invention, as described above, marking lines can be easily and accurately marked on the outer peripheral surface of the pipe (tubular body) without introducing impurities into the inside of the pipe (tubular body), and it is durable. It has excellent performance and ease of use. Therefore, the marking jig of the present invention is capable of marking marking lines for checking after welding whether or not there is any misalignment of the weld, for example, for pipes whose ends have been butt welded by a method such as automatic TIG welding. It is extremely useful in applications where

1,1A...Scoring jig 2,2A...Plate 2a...Surface 2b...Back surface 2c...Top surface 21...Slit hole (pair of slit holes)
22, 22a, 22b, 22c, 22d, 23, 23a, 23b, 23c, 23d...Bolt hole 3...Round blade (scoring means)
3a, 3b...Pair of round blades (round blade; scribing means)
31...Blade portion 32...Base 36...Spacer 37...Bolt 38...Nut J...Axes PA, PB, PC, PD...Piping (tubular body)
P1...Outer circumferential surface P2...Inner circumferential surface P3...One end P4...Central axis K...Marking line

Claims (8)

A marking jig for marking marking lines on the outer peripheral surface of a tubular body,
a plate pressed along an end of the tubular body;
a pair of spacers attached to the plate and having axes parallel to the central axis of the tubular body;
scribing means attached to at least one of the spacers,
The scribing means includes a round blade having a disk shape in plan view with an outer peripheral end serving as a blade portion, and the blade portion of the round blade contacts the outer peripheral surface of the tubular body to rotate around the outer peripheral surface. A marking jig characterized in that the marking line is engraved on the marking line. 2. The scribing jig according to claim 1, wherein the round blades are provided as a pair, and each of the pair of round blades is attached to the pair of spacers. 2. The scribing jig according to claim 1, wherein the pair of spacers are provided with variable distances between respective axes. The spacer is characterized in that by changing the position of the round blade in the axial direction, the distance of the marking line stamped on the outer peripheral surface of the tubular body from one end of the tubular body is adjusted. The scribing jig according to claim 1 or claim 2. A claim characterized in that one of the pair of spacers is rotatably installed so as to come into contact with the outer circumferential surface of the tubular body so as to rotate around the outer circumferential surface while rotating synchronously with the tubular body. The marking jig described in item 1. 2. The spacer according to claim 1, wherein one of the pair of spacers is fixed to the plate so as to rotate around the outer circumferential surface of the tubular body without rotation by coming into contact with the outer circumferential surface of the tubular body. The marking jig listed. 3. The scribing jig according to claim 1, wherein the angle between the axes of the pair of spacers and the central axis of the tubular body is in the range of 10 to 140 degrees. A method for marking a marking line, the method comprising marking a marking line on the outer peripheral surface of a tubular body using the marking jig according to claim 1 or claim 2.

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