JP7373619B1 - Marking jig and marking line method - Google Patents

Abstract

[Problem] Even if the wall thickness of the tubular body is thin, marking lines can be easily and accurately engraved on the outer circumferential surface of the tubular body without impairing the quality of the tubular body, and it is durable and easy to use. To provide an excellent marking jig and method for marking marking lines. [Solution] A plate 2 pressed along one end P3 of a pipe P, a pair of spacers 36, 36, and a pair of spacers attached to the plate 2 and having an axis parallel to a central axis P4 of the pipe P. A roller 4 that supports the pipe P by contacting the pipe P together with the spacers 36 and 36, a contact force adjustment section 5 that adjusts the contact force of the pair of spacers 36 and the roller 4 with respect to the pipe P, and at least one spacer 36. The round blade 3 has a disk shape in plan view with the outer peripheral end serving as a blade part 31, and the blade part 31 of the round blade 3 contacts the outer peripheral surface P1 of the pipe P. By doing so, a marking line K is stamped so as to go around the outer peripheral surface P1. [Selection diagram] Figure 2B

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).

Japanese Patent Application Publication No. 2003-071750

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, when the marking jig described in Patent Document 1 is used, if the wall thickness of the piping to be welded is thin, the marking line may be formed deeply, and the thinner wall thickness of this portion may cause There was a problem in that the piping could break and quality could be compromised.

The present invention has been made in view of the above problems, and it is possible to easily and accurately mark the outer peripheral surface of the tubular body without impairing the quality of the tubular body, even when the wall thickness of the tubular body is thin. To provide a marking jig capable of marking and having excellent durability and ease of use, and a method for marking marking lines using the same.

The present inventors have made extensive studies to solve the above problems. As a result, by optimizing the structure that supports the marking means that stamps marking lines on the outer peripheral surface of the tubular body, as well as the structure that supports the tubular body, even when the wall thickness of the tubular body is thin, it is possible to The present invention was completed based on the discovery that marking lines can be easily and accurately engraved on the outer peripheral surface of the body, and that durability and usability are also improved.
That is, the present invention employs the configuration shown below.

[1] A marking jig for marking marking lines 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 jig that is attached to the plate and parallel to the axis of the tubular body. a pair of first support parts having an axis; at least one second support part that supports the tubular body by abutting the tubular body together with the pair of the first support parts; and a pair of the first support parts. and a contact force adjustment means for adjusting the contact force of the second support part with respect to the tubular body, and a marking means attached to at least one of the first support parts, and the marking means includes a It consists of a circular blade having a disk shape in plan view with the end serving as a blade, and the blade 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. A marking jig that is characterized by:

[2] The scriber according to [1] above, wherein the round blades are provided in pairs, and the pair of round blades are respectively attached to the pair of first support parts. jig.

[3] The above [1] or the above, wherein the pair of the first support part and the second support part are rotatably or non-rotatably attached to the plate about their respective axes. The marking jig described in [2].

[4] The pair of first supporting portions are configured to change the position of the round blade in the axial direction so that the marking line stamped on the outer circumferential surface of the tubular body is separated from one end of the tubular body. The scribing jig according to any one of [1] to [3] above, characterized in that the scribing jig is provided so that the distance can be adjusted.

[5] The contact force adjusting means can slide the second support part along the plate so that the tubular body is sandwiched between a pair of the first support part and the second support part. an operating section, and an elastic force is generated in a direction to restore the position of the operating section when the operating section is operated, and in a direction in which the second support section comes into contact with the tubular body. a spring member provided so as to adjust the contact force of the round blade attached to the first support portion with respect to the tubular body by the elastic force of the spring member; The marking jig according to any one of [1] to [4] above, characterized in that the marking line is engraved on the outer peripheral surface.

[6] The contact force adjusting means can slide the second support part along the plate so that the tubular body is sandwiched between a pair of the first support part and the second support part. an operating section, and an elastic force is generated in a direction that restores the position of the operating section when the operating section is operated, and in a direction that moves the second support section away from the tubular body. and a spring member provided so as to cause the pair of first support part and second support part to come into contact with the tubular body by operating the operation part, and to be attached to the first support part. According to any one of [1] to [4] above, the marking line can be engraved on the outer peripheral surface of the tubular body while adjusting the contact force of the round blade against the tubular body. marking jig.

[7] The above-mentioned [1] to [6], wherein the contact force adjusting means adjusts the contact force of the pair of the first support part and the second support part to the tubular body to 5 to 20N. ] The marking jig described in any of the above.

[8] 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 any one of [1] to [7] above.

According to the scribing jig according to the present invention, firstly, by providing the contact force adjusting means for adjusting the contact force of the pair of first support parts and the second support part with respect to the tubular body, The contact force of the blade can be optimized. As a result, even if the wall thickness of the pipe to be welded is thin, it is possible to prevent the marking line from forming deeply, and the wall thickness at the marking line part does not become too thin, making it possible to prevent the wall thickness of the pipe to be welded from becoming too thin. This prevents the material from breaking, so there is no loss of quality.
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 contact force against the outer circumferential surface of the tubular body is uniform and gentle. distributed to As a result, compared to the case of using a sharp scribing needle, etc., the groove of the scribing line is formed shallower, and the wear of the round blade can be suppressed, and as above, the scribing line becomes deeper. You can prevent it from happening too much.
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, even if the wall thickness of the tubular body is thin, marking lines can be easily and accurately engraved on the outer peripheral surface of the tubular body without impairing the quality of the tubular body, and the durability and usability are improved. It becomes possible to provide an excellent scribing jig.

Furthermore, according to the marking line marking method according to the present invention, the marking line is stamped using the marking jig according to the invention described above, so that even when the wall thickness of the tubular body is thin, , 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 illustrating a marking jig and a marking method for marking lines according to a first embodiment of the present invention, and is a perspective view schematically showing a state in which the marking jig is viewed from the surface side on which a tubular body is set. be. 1A is a diagram schematically illustrating a marking jig and marking line marking method according to the first embodiment of the present invention, in which a tubular body is set in the marking jig shown in FIG. 1A, 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 in which the marking jig is seen from the surface side where the tubular body is set. FIG. 1 is a diagram schematically illustrating a marking jig and a marking method for marking lines according to a first embodiment of the present invention, and is a schematic diagram of the marking jig shown in FIG. 1A viewed from the side. FIG. 2 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 is set in the marking jig shown in FIG. 2A and a marking is made on the outer peripheral surface of the tubular body. It is a figure showing the procedure of marking a line, and is a schematic view of the scribing jig seen from the side. FIG. 2 is a diagram schematically explaining a marking jig and marking line marking method according to the first embodiment of the present invention, and is a schematic diagram showing the relationship between each dimension and load of a spring member used in a contact force adjusting means. be. FIG. 2 is a diagram schematically illustrating a marking jig and a marking method for marking lines according to the first embodiment of the present invention, and is a schematic diagram showing an example of a spring member used in a contact force adjusting means. FIG. 2 is a diagram schematically illustrating a marking jig and marking line marking method according to the first embodiment of the present invention, and is a schematic diagram showing another example of a spring member used in the contact force adjusting means. FIG. 2 is a diagram schematically explaining a marking jig and marking line marking method according to a second embodiment of the present invention, and is a diagram illustrating an operation for setting a tubular body in a marking jig, in which the tubular body is set. FIG. 2 is a perspective view schematically showing the scribing jig as viewed from the front side. FIG. 5 is a diagram schematically explaining a marking jig and marking line marking method according to a second embodiment of the present invention, and marking marking lines are stamped on the outer peripheral surface of the tubular body set in the marking jig shown in FIG. 5A. FIG. 3 is a perspective view schematically showing the scribing jig as viewed from the surface side on which the tubular body is set. FIG. 5 is a diagram schematically illustrating a marking jig and marking line marking method according to a second embodiment of the present invention, and is a schematic diagram of the marking jig shown in FIG. 5A viewed from the side. 6A 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. 6A, and the outer peripheral surface of the tubular body is marked. It is a figure showing the procedure of marking a line, and is a schematic view of the scribing jig seen from the side.

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 6A and 6B 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, a marking jig according to a first embodiment of the present invention and a marking method for marking lines using the same will be described in detail with reference to FIGS. 1A and 1B, and FIGS. 2A and 2B.
FIG. 1A is a schematic perspective view of the marking jig 1 of the present embodiment viewed from the surface 2a side where the piping (tubular body) P is set, and FIG. 1B is a schematic perspective view of the marking jig 1 shown in FIG. 1A. It is a figure showing the procedure of setting P and marking a marking line K on the outer peripheral surface P1 of the pipe P, and is a schematic perspective view showing the state where the marking jig 1 is viewed from the surface 2a side where the pipe P is set. Further, FIG. 2A is a schematic diagram of the marking jig 1 shown in FIG. 1A viewed from the side surface 2e, and FIG. 2B is a diagram showing the outer periphery of the pipe P set in the marking jig 1 shown in FIG. 2A. It is a diagram showing a procedure for marking a marking line K on the surface P1, and is a schematic view of the marking jig 1 viewed from the side surface 2e side.
FIG. 3 is a schematic diagram showing the relationship between each dimension and load of the spring member 53 used in the contact force adjustment section 5 (contact force adjustment means; see FIG. 1A etc.) provided in the scribing jig 1 of this embodiment. It is. Moreover, FIG. 4A is a schematic diagram showing an example of a spring member used in the contact force adjustment section 5, and FIG. 4B is a schematic diagram showing another example of the spring member.

[Structure of marking jig]
As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the scribing jig 1 of this embodiment has a round blade 3 that is a scribing means that contacts the outer circumferential surface P1 of a pipe P that is a tubular body. In addition, a marking line K is stamped on the outer circumferential surface P1 of the pipe P.

The marking jig 1 of this embodiment includes a pair of plates 2 that are pressed against one end (end) P3 of a pipe P, and an axis J that is attached to the plate 2 and is parallel to a central axis P4 of the pipe P. spacers (first support parts) 36, 36, and a roller (at least one second support part) 4 that supports the pipe P by coming into contact with the pipe P together with the pair of spacers 36, 36.
Furthermore, the scribing jig 1 of this embodiment includes a pair of spacers 36, 36 and a contact force adjustment section (contact force adjustment means) 5 that adjusts the contact force of the roller 4 with respect to the pipe P.
Furthermore, the scribing jig 1 has a round blade (scribing means) 3 attached to at least one spacer 36, and in the example described in this embodiment, a pair of round blades 3a and 3b are provided. , are attached to one of the pair of spacers 36, 36, respectively.
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 P, a marking line K is stamped so as to go around the outer circumferential surface P1.

Further, in the illustrated example of the marking jig 1, a pair of spacers 36, 36 are arranged along an axis J parallel to the central axis P4 of the piping P, and a pair of round blades 3a, 3b are attached to the pair of spacers 36, 36. Similarly to the above, they are arranged along parallel axes J. Further, in the illustrated scribing jig 1, the roller 4 is also arranged along an axis J that is parallel to the pair of round blades 3a and 3b.
As will be described in detail later, the marking jig 1 supports the piping P with a plate 2, a pair of round blades 3a, 3b (a pair of spacers 36, 36), and a roller 4, thereby forming a marking line K. The structure is such that the pipe P can be held during marking.
Each of the above-mentioned components is assembled to a plate 2 that functions as a housing of the scribing jig 1.

As described above, the plate 2 is pressed against one end P3 of the pipe P when marking the marking line K on the outer peripheral surface P1 of the pipe P, and the plate 2, the pair of round blades 3a, 3b and rollers 4 to hold the pipe P. 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.

Further, a pair of bolt holes (not shown) for attaching a pair of spacers 36, 36 are formed in the plate 2. More specifically, two locations (not shown) are located slightly downward from the top surface 2c of the plate 2 toward the bottom surface 2d, are arranged parallel to the top surface 2c, and are symmetrical in plan view. are arranged at positions corresponding to the spacers 36, 36.
Furthermore, a slit hole 22 for movably attaching the roller 4 is formed in the plate 2. In the illustrated example, the slit hole 22 is formed in a vertically elongated shape at a position closer to the lower surface 2d of the plate 2, and is arranged approximately at the center in a plan view.
Furthermore, a pair of through holes (not shown) are formed in the plate 2 for attaching a support plate 51 of the contact force adjustment section 5, the details of which will be described later. That is, two insertion holes (not shown) are arranged in the plate 2 at positions near the upper surface 2c of the plate 2, parallel to the upper surface 2c, and symmetrical in plan view. .

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 P and that is easy for the user of the scribing jig 1 to grasp, such as 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 P, and as shown in FIGS. 1A and 1B, are configured in a disk shape in plan view, The outer peripheral end is a blade portion 31 that contacts the outer peripheral surface P1 of the pipe P. Further, the pair of round blades 3a and 3b in the illustrated example are provided with through holes (not shown) arranged coaxially with the axis J at the base portions (not shown) centered on the axis J. Further, the pair of round blades 3a and 3b in the illustrated example are configured to be thinner at the outer peripheral side including the blade portion 31 than at the base near the axis J.

Further, as shown in FIGS. 1A and 1B, in the marking jig 1 of this embodiment, two spacers 36, 36 provided in a pair correspond to a pair of bolt holes (not shown) in the plate 2. A round blade 3a or a round blade 3b is attached to the tip side of each of the pair of spacers 36, 36.

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 threaded portions of the two bolts 37 are inserted into a pair of bolt holes provided in the plate 2, and the tips are screwed into the nuts 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.

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 P, it is preferably about 5 to 50 mm, and more preferably 10 to 30 mm. .

The pair of spacers 36, 36 is not particularly limited, and for example, a cylindrical member made of resin or metal can be used without any restriction. On the other hand, the material of the pair of spacers 36, 36 is preferably a softer material than the material of the piping to be marked, from the viewpoint of preventing damage to the piping P.

The scribing jig 1 of this embodiment includes the pair of spacers 36, 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, i.e. , it becomes possible to change the distance of the pair of round blades 3a, 3b from the surface 2a of the plate 2. This makes it possible to adjust the distance of the marking line K stamped on the outer circumferential surface P1 of the pipe P from the one end P3 of the pipe P.

The outer diameter of each of the pair of spacers 36, 36 is not particularly limited, but in order to prevent the spacer 36 from interfering with the outer peripheral surface P1 of the pipe P during scribing work, the outer diameter of the pair of round blades 3a, 3b is It is preferable that the outer diameter is slightly smaller than that of the outer diameter.

In this embodiment, for example, one of the pair of spacers 36, 36 comes into contact with the outer circumferential surface P1 of the pipe P, and thereby rotates around the outer circumferential surface P1 around the axis J while rotating synchronously with the pipe P. It can be installed rotatably.
On the other hand, in this embodiment, one of the pair of spacers 36, 36 is fixed to the plate 2 so as to come into contact with the outer circumferential surface P1 of the pipe P so as to rotate around the outer circumferential surface P1 without rotating. It is also possible to adopt a configuration in which
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 P. It is preferable to use the following.

In addition, in this embodiment, when the pair of round blades 3a, 3b is configured to be fixed without rotation, the pair of round blades 3a, 3b contact the outer circumferential surface P1 without rotating. The marking line K can be stamped as a shallow groove on the outer peripheral surface P1.

On the other hand, in this embodiment, a pair of round blades 3a, 3b are rotatable around their respective axes J, and these round blades 3a, 3b are in contact with the outer peripheral surface P1 of the pipe P, respectively. It is also possible to adopt a configuration in which a marking line K is stamped on the outer circumferential surface of the pipe P by synchronous rotation.
As mentioned above, since the pair of round blades 3a and 3b are rotatable, the marking line K stamped on the outer circumferential surface P1 of the pipe P is smaller than when the pair of round blades 3a and 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 order to reliably prevent the pipe P from being cut when the wall thickness of the pipe P is thin, and in consideration of the durability and life of the pair of round blades 3a and 3b, the outer peripheral surface P1 of the pipe P is engraved. If it is desired to form the scribing line K as shallow as possible, the pair of round blades 3a, 3b may be fixed without rotation as described above.
For example, even when one round blade 3a is used, it may be fixed to the spacer 36 without rotation, or may be rotatably installed.

Further, in this embodiment, for example, one of the pair of round blades 3a, 3b is rotatable around the axis J, and synchronizes with the pipe P while contacting the outer circumferential surface P1 of the pipe P. By rotating, the marking line K is stamped on the outer peripheral surface P1 of the piping P, while the other round blade 3b contacts the outer peripheral surface P1 of the piping P without rotating, thereby marking the outer peripheral surface P1 of the piping P. It is also possible to have a configuration in which the line K is engraved.
In such a configuration, one of the pair of round blades 3a, 3b, which is rotatable, is a marking line formed by a relatively deep groove on the outer circumferential surface P1 of the pipe P. On the other hand, the other round blade 3b, which is fixed in a non-rotating manner, acts to stamp a marking line K, which is a relatively shallow groove, on the outer circumferential surface P1 of the pipe P. Thereby, the marking line K stamped on the outer peripheral surface P1 of the pipe P can be formed as a groove having an optimal depth.

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 circumferential surface P1 of the pipe P in the pair of round blades 3a, 3b when the pipe P is set in the scribing jig 1. It is preferable to arrange the pipe P so as to correspond to the position where it comes into contact with the pipe P from the viewpoint of avoiding interference between the pipe P and a cover (not shown).

In this embodiment, by adopting a configuration in which a pair of round blades 3a and 3b as described above are provided, as shown in FIGS. 1B and 2B, the pair of round blades 3a and 3b and the surface 2a of the plate 2 are , and rollers 4, the pipe P can be supported by a total of four points of support. In the illustrated example, a contact point C1 between the round blade 3a and the pipe P, a contact point C2 between the round blade 3b and the pipe P, a contact point C3 between the surface 2a of the plate 2 and the pipe P, and a contact point C4 between the roller 4 and the pipe P are shown. Piping P is supported at four points. This stabilizes the holding posture of the pipe P when setting the pipe P in the marking jig 1 and marking the marking line K on the outer peripheral surface P1, making it possible to perform stable marking work.

In addition, in this embodiment, for example, 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 peripheral surface of the pipe. It is. On the other hand, in such a case, although detailed illustrations are omitted, the pipe P is supported at four points by one round blade 3, the spacer 36, the plate 2, and the roller 4. 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 P 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 P may appear too thin, and the visibility may be slightly reduced. From this point of view, it is more preferable that the round blades 3 are provided as a pair.

As described above, the roller 4 is arranged along the axis J parallel to the round blade 3 and is configured to be freely rotatable. Further, the rollers 4 in the examples shown in FIGS. 1A and 2A and FIGS. 2A and 2B rotate in synchronization with the pipe P while contacting the outer peripheral surface P1 of the pipe P, so that the surface 2a of the plate 2 and the pair of rollers 4 The pipe P is held by four-point support by round blades 3a, 3b and rollers 4. Further, in the illustrated example, the pair of round blades 3a, 3b and the roller 4 are arranged in an inverted isosceles triangle arrangement in plan view.
Further, the roller 4 in the illustrated example has a generally cylindrical shape, and a through hole (not shown) is provided on the axis.

As the roller 4, for example, a conventionally known bearing can be used, but the roller 4 is not limited to this, and any cylindrical (doughnut-shaped) member can be used. be.
Further, the material of the roller 4 is not particularly limited, and for example, a material having an outer periphery made of metal can be used, but using a material having an outer periphery made of resin may prevent the outer periphery P1 of the pipe P from being damaged. This is preferable from the viewpoint of preventing.

The roller 4 also has a bolt 41 inserted into a through hole provided on the axis of the roller 4 and a nut 42 arranged on the back surface 2b of the plate 2, with respect to the slit hole 22 provided in the plate 2. By screwing, it is fixed to a slide plate 52 provided in the contact force adjustment section 5, which will be described in detail later. At this time, the roller 4 is arranged so as to be slidable toward or away from the pair of round blades 3a, 3b (a pair of spacers 36, 36) in the length direction of the slit hole 22. Further, the roller 4 is slid within the lengthwise range of the slit hole 22 by operation of a contact force adjustment section 5, which will be described later.

When marking the marking line K on the outer circumferential surface P1 of the pipe P using the marking jig 1 of this embodiment, the roller 4 is moved toward the pair of round blades 3a and 3b by the contact force adjustment section 5, the details of which will be described later. While sliding and bringing one end P3 of the piping P into contact with the surface 2a of the plate 2, the roller 4 is brought into contact with the outer peripheral surface P1 of the piping P, and a pair of round blades 3a, 3b are attached to the outer peripheral surface P1 of the piping P. By making contact, the pipe P is held with four-point support. At this time, by adjusting the contact force (pressing force) of the roller 4 against the pipe P by operating the contact force adjustment unit 5, the force generated between the pair of round blades 3a, 3b and the outer circumferential surface P1 of the pipe P is adjusted. Optimize the contact force. Then, in this state, by rotating the marking jig 1 or rotating the pipe P, the marking line K is set to the optimum depth with the pair of round blades 3a and 3b on the outer peripheral surface P1 of the pipe P. It can be engraved with.

In this embodiment, similarly to the pair of round blades 3a and 3b, the roller 4 may be configured to be rotatable about the axis J, or may be configured not to rotate.

Further, in this embodiment, as described above, a configuration in which the roller 4 is provided at only one location is described, but the present invention is not limited to this, and the number of rollers 4 installed can be determined as appropriate. be.

As described above, the contact force adjustment section 5 is for adjusting the contact force of the pair of round blades 3a, 3b (a pair of spacers 36, 36) and the roller 4 with respect to the pipe P. The contact force adjustment unit 5 moves the roller 4 along the slit hole 22 of the plate 2 so that the pair of round blades 3a, 3b (a pair of spacers 36, 36) and the roller 4 sandwich the outer peripheral surface P1 of the pipe P. As an operation section that can be slid, it is configured to include a slide plate (operation section) 52 and a slide shaft (operation section) 54. In the examples shown in FIGS. 1A and 1B, and FIGS. 2A and 2B, the contact force adjustment section 5 includes a support plate 51 fixed to the upper surface 2c of the back surface 2b of the plate 2, a slide plate 52, and a spring member. 53 and a slide shaft 54.

The support plate 51 supports the slide shaft 54, and in the illustrated example, is made of a plate-like member that is approximately rectangular in plan view. The mounting end 51a of the support plate 51 is fixed to the back surface 2b of the plate 2 by two screws 51b, 51b, and in the illustrated example, the support plate 51 is inserted into two unillustrated insertion holes formed in the plate 2. The support plate 51 is fixed to the plate 2 by screwing the two screws 51b, 51b into screw holes (not shown) formed in the attachment end 51a. Further, in the illustrated example, the support plate 51 is attached to the plate 2 in a cantilevered support structure so as to be perpendicular to the plate 2 . Furthermore, a through hole 51c is formed in the support plate 51 at a position closer to the plate 2 in plan view, into which a slide shaft 54 (details of which will be described later) is inserted.

The material of the support plate 51 is not particularly limited, and for example, the same metal material as the plate 2 to which the support plate 51 is attached, such as stainless steel or aluminum, can be used without any restriction.
Furthermore, the shape of the support plate 51 in plan view is not limited to the rectangular shape in plan view as shown in the illustrated example, but may have a shape that is easy for the user of the scribing jig 1 to grasp, for example, the corners may be corner-cut. It is also possible to adopt a rectangular shape, a rectangular shape with rounded corners, a round shape, etc.
Further, the plan view dimensions and thickness dimensions of the support plate 51 are not particularly limited, and may be set to dimensions that are easy for the user of the scribing jig 1 to grasp, while also considering ensuring the strength of the support plate. Bye.

As described above, the slide plate 52 supports the roller 4 so as to be slidable in the length direction of the slit hole 22 via the bolt 41 inserted into the slit hole 22 provided in the plate 2. The slide plate 52 in the illustrated example is composed of an L-shaped member having a generally rectangular shape in a plan view. It is placed on the 2d side.

Further, a bolt hole c (not shown) is formed in the upright plate 52a of the slide plate 52, and the threaded portion of the bolt 41 is inserted into this bolt hole. Then, the threaded portion of the bolt 41 is screwed into the nut 42, so that the roller 4 into which the bolt 41 is inserted is supported by the slide plate 52. In the example shown in FIGS. 2A and 2B, the threaded part of the bolt 41 is screwed between the upright plate 52a of the slide plate 52 and the back surface 2b of the plate 2, so that the threaded part of the bolt 41 is inserted between the nut 42 and the upright plate 52a of the slide plate 52. A thin nut 43 is arranged to sandwich and fix the upright plate 52a. Similarly, the threaded portion of the bolt 41 is screwed between the roller 4 and the surface 2a of the plate 2, so that the roller 4 is sandwiched between the head portion of the bolt 41 and the roller 4 can be freely rotated. A thin nut 43 for fixing (or non-rotating) is arranged.

Further, a hole 52d for fixing the slide shaft 54 is formed at the upper end of the upright plate 52a of the slide plate 52, and the lower end of the slide shaft 54, which will be described later, is fitted into the hole 52d. , or fixed by screwing.

The material of the slide plate 52 is not particularly limited, and similarly to the support plate 51, metal materials such as stainless steel and aluminum can be used without any restrictions.
Further, the shape of the slide plate 52 in plan view is not limited to a rectangular shape in plan view, but, like the support plate 51, it may have a shape that is easy for the user of the scribing jig 1 to grasp, for example, the corners are cut with corners. It is also possible to adopt a rectangular shape with rounded corners, a rectangular shape with rounded corners, a round shape, etc.
Further, the plan view dimensions and thickness dimensions of the slide plate 52 are not particularly limited as long as they are dimensions that are easy for the user of the scribing jig 1 to grip while taking into consideration ensuring strength and the like.

The spring member 53 exerts a contact force against the pipe P by sliding the slide plate 52 and the roller 4 by the restoring force (elastic force, spring strength) of the spring action. That is, the spring member 53 is attached to the slide shaft 54 so that the slide shaft 54, which will be described in detail later, is inserted therein, and one end 53b side contacts a flange 54a of the slide shaft 54, which will be described later, and the other end The 53c side is in contact with the upper surface 51d of the support plate 51. Thereby, the spring member 53 is compressed by the operation of the slide shaft 54, thereby exerting a restoring force.

The spring member 53 of this embodiment is made of a coil spring (compression coil spring) in which a wire 53a is spirally wound, and by compressing it in the length direction, it exerts a restoring force in the extension direction. .
The material of the spring member 53 is not particularly limited, and for example, general spring materials used for coil springs, such as stainless steel, can be used without any restrictions.
Note that details regarding the restoring force of the spring member 53 will be described later.

The slide shaft 54 is operated by the user of the scribing jig 1 to push down the spring member 53, slide the slide plate 52, and slide the roller 4 in the direction away from the pair of round blades 3a, 3b. At the same time, the spring member 53 is pushed down and compressed. In the illustrated example, the slide shaft 54 is made of a rod-shaped member, and a flange 54a that serves as a stopper for the spring member 53 is provided on the upper end side. Further, as described above, the lower end side of the slide shaft 54 is fixed to the hole 52d of the slide plate.

The material of the slide shaft 54 is not particularly limited, and similarly to the support plate 51 and the slide plate 52, metal materials such as stainless steel can be used without any restrictions.

In this embodiment, when the user of the scribing jig 1 presses down the slide shaft 54 provided in the contact force adjustment section 5, the spring member 53 is in the direction of restoring the position of the slide shaft 54, In addition, a restoring force (elastic force) is generated in the roller 4 in the direction in which it contacts the pipe P, that is, in the direction in which it slides toward the pair of round blades 3a and 3b. Through such operations and the restoring force of the spring member 53, the contact force of the pair of round blades 3a, 3b attached to the pair of spacers 36, 36 with respect to the outer peripheral surface P1 of the pipe P is adjusted, and the outer peripheral surface P1 is adjusted. A marking line K can be engraved with the optimum depth.

In this embodiment, the contact force of the pair of round blades 3a, 3b and the roller 4 with respect to the piping P is not particularly limited, and the depth of the marking line K to be formed is determined depending on the material, wall thickness, etc. of the piping P. The contact force adjustment section 5 can appropriately adjust the contact force so that the contact force is optimal. On the other hand, in the present embodiment, from the viewpoint of forming the marking line K at the optimum depth without impairing the quality of the piping P and accurately, by adjusting the contact force adjustment part 5 as appropriate, the pair of It is preferable to adjust the contact force of the round blades 3a, 3b and the roller 4 to the pipe P to be 5 to 20N. Further, from the above point of view, it is more preferable to adjust the contact force of the pair of round blades 3a, 3b and the roller 4 against the pipe P to 6 to 18N, most preferably 8 to 15N.

As mentioned above, the method of adjusting the contact force of the pair of round blades 3a, 3b and the roller 4 with respect to the pipe P using the contact force adjustment unit 5 provided in the scribing jig 1 of this embodiment is as follows. One example is a method of changing the restoring force (elastic force).
Here, in the spring member 53 made of a coil spring (compression coil spring) in which a wire 53a is spirally wound as shown in FIG. 3, the factors that can adjust the restoring force of the spring member 53 include the wire The wire diameter d (mm) of the spring member 53a, the free height Hf (mm) when not compressed, and the outer diameter O. of the entire spring member 53. D (mm), height H1 (mm) under standard load when standard load Pr1 (N), and height H2 (mm) under permissible load when permissible load Pr2 (N). Among these, the height at standard load H1 (mm) and the height at allowable load H2 (mm) are the wire diameter d (mm) and the outer diameter O. It can be adjusted by changing D (mm) etc.

For example, when the wire diameter d (mm) of the wire rod 53a is increased, the restoring force increases, and the contact force of the pair of round blades 3a, 3b and the roller 4 against the pipe P increases. When is made small, the restoring force becomes small and the above-mentioned contact force also becomes small.
Also, the outer diameter of the entire spring member 53 is O. When D (mm) is increased, the restoring force increases, and the contact force of the pair of round blades 3a, 3b and the roller 4 against the pipe P increases, while the outer diameter O. When D (mm) is made small, the restoring force becomes small and the above-mentioned contact force also becomes small.

In addition, when the ratio of the height H1 (mm) at the standard load under the standard load Pr1 (N) to the free height Hf (mm) at the uncompressed state is increased, the restoring force increases and the pair of circles The force of contact between the blades 3a, 3b and the roller 4 against the pipe P increases. On the other hand, if the ratio of the reference load height H1 (mm) to the free height Hf (mm) is made small, the restoring force becomes small and the above-mentioned contact force also becomes small.
In addition, when the ratio of the allowable load height H2 (mm) at the allowable load Pr2 (N) to the uncompressed free height Hf (mm) is increased, the restoring force increases and the pair of circles The force of contact between the blades 3a, 3b and the roller 4 against the pipe P increases. On the other hand, when the ratio of the allowable load height H2 (mm) to the free height Hf (mm) is made small, the restoring force becomes small and the above-mentioned contact force also becomes small.

Note that the processed shape of the end of the wire rod 53a in the spring member 53 is not particularly limited, and may be shaped according to the size of the coil spring constituting the spring member 53, etc. For example, as shown in FIG. 4A, a spring member 53A having a closed end structure may be adopted without grinding the end of the wire 53a, or as shown in FIG. 4B, the end of the wire 53a may be ground. A spring member 53B having a shape may be adopted.

Further, the wall thickness of the pipe P on which the marking line K is stamped on the outer peripheral surface P1 by the marking jig 1 of the present embodiment is not particularly limited, but is preferably 0.2 mm to 2.8 mm, and 0.2 mm to 2.8 mm. 5 mm to 2.4 mm is more preferable, and even more preferably 0.7 mm to 2 mm. If the wall thickness of the pipe P is within the above range, even if the wall thickness of the pipe P is thin, the quality can be achieved on the outer circumferential surface P1 of the pipe P, which can be obtained by applying the marking jig 1 of this embodiment. The effect of being able to easily and accurately mark the marking line K without damaging the markings can be obtained.

Here, the wall thickness of the pipe P is independent of the size of the pipe diameter, but generally speaking, the smaller the pipe diameter, the thinner the wall thickness. That is, by using the marking jig 1 of this embodiment, even when marking a marking line K on a small-diameter pipe P with a thin wall thickness, it is possible to easily and accurately mark the marking line K without sacrificing quality. It becomes possible to engrave K.

As explained above, according to the scribing jig 1 of the present embodiment, the pair of round blades 3a, 3b (the pair of spacers 36, 36) and the contact force adjustment part that adjusts the contact force of the roller 4 with respect to the pipe P 5, the contact force of the pair of round blades 3a, 3b against the outer circumferential surface P1 of the pipe P can be adjusted to an optimal range. As a result, even if the wall thickness of the pipe P is thin, it is possible to prevent the marking line K from forming deeply, and the wall thickness at the marking line K does not become too thin, and the pipe P This prevents the material from breaking, so there is no loss of quality.

Further, 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 P. The effect that the pressing force on the outer circumferential surface P1 of the pipe P is uniformly and gently distributed can be obtained. As a result, compared to the case where a sharp scribing needle or the like is used, the groove of the scribing line K is formed shallower, and the wear of each of the pair of round blades 3a and 3b can be suppressed. Similarly to the above, it is possible to prevent the marking line K from becoming too deep.

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 P are stable, so the outer circumference of the pipe P is stabilized. 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. .

Furthermore, according to the marking jig 1 of this embodiment, in addition to the one end P3 of the pipe P coming into contact with the surface 2a of the plate 2, the roller 4 comes into contact with the outer peripheral surface P1 of the pipe P, and the outer peripheral surface of the pipe P A structure is adopted in which the pair of round blades 3a and 3b come into contact with P1, thereby sandwiching and supporting the pipe P from the outer circumferential surface P1 side. This stabilizes the posture and operation when marking the marking line K on the outer circumferential surface P1 of the pipe P. In addition, since the marking line K is engraved on the outer circumferential surface P1 without bringing a roller or the like into contact with the inner circumferential surface P2 of the piping P, dust and dust etc. do not adhere to the inner circumferential surface P2 of the piping P. Since there is no impurity in the pipe P, it is possible to prevent impurities from entering the inside of the pipe P. In addition, since the structure is such that the outer circumferential surface P1 of the pipe P is clamped by the pair of round blades 3a, 3b and the roller 4 that can slide along the slit hole 22, the outer circumferential surface P1 of the pipe P is clamped. Even if it is used, it can be easily adjusted.

Therefore, according to the marking jig 1 of the present embodiment, even if the wall thickness of the pipe P is thin, it is possible to easily and accurately mark the outer peripheral surface P1 of the pipe P without impairing the quality of the pipe P. It is possible to provide a marking jig 1 that is capable of stamping K and has excellent durability and ease of use.

In addition, 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 contact force of the pair of round blades 3a, 3b and the roller 4 against the pipe P by the contact force adjustment section 5, a marking line is stamped on the outer circumferential surface P1 of the pipe P. It is preferable to mark the marking line K while optimizing it so that the K does not become too deep.

[How to mark the marking line]
The marking method of marking lines according to this embodiment will be explained with reference mainly to FIGS. 1A and 1B, and FIGS. 2A and 2B.
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 P using the marking jig 1 of this embodiment described above.

First, by checking and adjusting the size of the spacer 36 and determining the position of the pair of round blades 3a, 3b in the axial direction, the position on the outer peripheral surface P1 of the pipe P where the marking line K should be formed is determined.

Next, as shown in FIGS. 1B and 2B, by pressing down the slide shaft 54 provided in the contact force adjustment section 5, the position of the roller 4 is moved along the slit hole 22, and the roller 4 is moved between the pair of It is placed at a position apart from the round blades 3a and 3b, and in this state, the piping P on which the marking line K is to be marked is set on the surface 2a side of the plate 2.
At this time, a part of the cylindrical wall constituting the pipe P is arranged between the pair of round blades 3a, 3b and the roller 4, and one end P3 of the pipe P is set so as to come into contact with the surface 2a of the plate 2. do.

Next, by completing the pressing operation of the slide shaft 54, the position of the roller 4 is moved along the slit hole 22, and a part of the cylindrical wall (outer circumferential surface P1) constituting the pipe P is moved by the pair of round blades 3a. , 3b and the roller 4. At this time, the spring member 53 provided in the contact force adjustment section 5 is in the direction that restores the position of the slide shaft 54 and in the direction that contacts the piping P with respect to the roller 4, that is, the pair of round blades. A restoring force (elastic force) is generated in the direction of sliding toward 3a and 3b. Due to the restoring force of the spring member 53, the pair of round blades 3a and 3b come into contact with the outer peripheral surface P1 of the pipe P with a predetermined contact force, and the roller 4 also comes into contact with the outer peripheral surface P1 with a predetermined contact force. The state will be as follows.

Next, while holding the piping P with four-point support by the surface 2a of the plate 2, the pair of round blades 3a and 3b, and the roller 4, the piping P is rotated by rotating the marking jig 1 or by rotating the piping P. A scribing line K is stamped on the outer circumferential surface P1 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 peripheral surface P1 of the pipe P, for example, by rotating the pipe P or the marking jig 1 multiple times.
Through the above operations and the restoring force of the spring member 53, the contact force of the pair of round blades 3a, 3b attached to the pair of spacers 36, 36 with respect to the outer peripheral surface P1 of the pipe P is adjusted, and the outer peripheral surface Mark a marking line K at the optimum depth on P1.

Next, by pressing down the slide shaft 54 again, the position of the roller 4 is moved along the slit hole 22, and the pair of round blades 3a, 3b and the roller 4 are separated from the outer peripheral surface P1 of the pipe P. Remove from marking jig 1.
By the above-described procedure, the marking line K can be stamped at a desired position on the outer circumferential surface P1 of the pipe P at an optimal depth.

According to the method of marking the marking line K of this embodiment, since the marking line K is marked using the marking jig 1 of the embodiment described above, it is possible to print the marking line K even when the wall thickness of the pipe P is thin as described above. Also, it becomes possible to easily and accurately mark the marking line K on the outer circumferential surface P1 of the pipe P.

<Second embodiment>
The configuration of the marking jig according to the second embodiment of the present invention and the marking method of marking lines using the same will be explained below mainly with reference to FIGS. 5A and 5B, and FIGS. 6A and 6B. Explain in detail.
In addition, in the description of the marking jig 1A of this embodiment and the marking method of the marking line K shown below, the marking jig 1 of the first embodiment shown in FIGS. 1A and 1B to 4A and 4B will be used. The same configurations are given the same reference numerals, the same drawings may be referred to, and the detailed description thereof may be omitted.

FIG. 5A is a diagram illustrating the operation of setting the piping P on the scribing jig 1A of the present embodiment, and is a schematic perspective view showing the scribing jig 1 viewed from the surface 2a side on which the piping P is set. FIG. 5B is a diagram showing a procedure for marking a marking line K on the outer peripheral surface P1 of the pipe P set on the marking jig 1 shown in FIG. 5A. FIG. Further, FIG. 6A is a schematic diagram of the marking jig 1 shown in FIG. 5A viewed from the side surface 2e, and FIG. 6B is a diagram showing the outer periphery of the pipe P set in the marking jig 1 shown in FIG. 6A. It is a diagram showing a procedure for marking a marking line K on the surface P1, and is a schematic view of the marking jig 1 viewed from the side surface 2e side.

As shown in FIGS. 5A and 5B, as well as FIGS. 6A and 6B, the scribing jig 1A of the present embodiment, like the scribing jig 1 of the first embodiment, includes a plate 2 and a pair of spacers 36, 36. , a roller 4, round blades 3a, 3b, a pair of round blades 3a, 3b (a pair of spacers 36, 36), and a contact force adjustment section 5A that adjusts the contact force of the roller 4 with respect to the pipe P. Further, in the scribing jig 1A 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 the blade portion 31, and each of the pair of round blades 3a, 3b has a circular shape. 1A, FIG. 1B, and FIG. 2A in that the blade portions 31, 31 contact the outer peripheral surface P1 of the pipe P, thereby stamping the marking line K so as to go around the outer peripheral surface P1. This is the same as the scribing jig 1 of the first embodiment shown in FIG. 2B.

Furthermore, the contact force adjustment section 5A provided in the scribing jig 1A of this embodiment moves the roller 4 so that the piping P is sandwiched between the pair of round blades 3a, 3b (a pair of spacers 36, 36) and the roller 4. It is similar to the contact force adjustment section 5 provided in the scribing jig 1 of the first embodiment in that it has a slide plate 52 and a slide shaft 54 as an operation section that can be slid along the plate 2.

On the other hand, in the scribing jig 1A of the present embodiment, when the slide plate 52 provided in the contact force adjustment section 5A is pressed, the spring member 53 is in a direction to restore the position of the slide plate 52, and This differs from the scribing jig 1 of the first embodiment in that a restoring force (elastic force) is generated on the roller 4 in a direction away from the pipe P.
In the scribing jig 1A of this embodiment, the pair of round blades 3a, 3b and the roller 4 are brought into contact with the pipe P by pushing the slide plate 52 provided in the contact force adjustment section 5A, and the pair of spacers 36 , 36, while adjusting the abutment force of the pair of round blades 3a, 3b attached to the outer circumferential surface P1 of the pipe P, it is possible to engrave the marking line K of the optimum depth on the outer circumferential surface P1. This is different from the scribing jig 1 of the first embodiment.

That is, in the contact force adjusting section 5A provided in the scribing jig 1A of this embodiment, the spring member 53 is inserted into the slide shaft 54, and one end 53b contacts the lower surface 51e of the support plate 51, and the other end 53c This differs from the contact force adjustment unit 5 provided in the scribing jig 1 of the first embodiment in that the contact force adjustment unit 5 is arranged so as to contact the inner surface of the horizontal plate 52b of the slide plate 52.

The contact force adjustment unit 5A provided in the scribing jig 1A of this embodiment is such that when the user is not operating it, the slide plate 52 is placed on the lower surface 2d side of the plate 2 due to the elastic force of the spring member 53. maintain the same condition. Then, by pushing the slide plate 52, the roller 4 is slid and the pipe P is sandwiched between the roller 4 and the pair of round blades 3a and 3b, and when the user maintains this state, the pipe P A marking line K can be engraved on the outer peripheral surface P1. That is, in the scribing jig 1 of the first embodiment, the spring member 53 generates a restoring force in a direction that brings the support plate 51 and the slide plate 52 closer together, whereas in this embodiment, the spring member 53 The member generates a restoring force in a direction that separates the support plate 51 and the slide plate 52.

When marking a marking line K on the outer circumferential surface P1 of the pipe P using the marking jig 1A equipped with the contact force adjustment section 5A as described above, the following operations are performed.
First, similarly to the method described in the first embodiment, by checking and adjusting the size of the spacer 36 and determining the position of the pair of round blades 3a, 3b in the axial direction, After determining the position where the marking line K is to be formed, the piping P on which the marking line K is to be engraved is set on the surface 2a side of the plate 2.
At this time, as shown in FIGS. 5A and 6A, a part of the cylindrical wall constituting the pipe P is arranged between the pair of round blades 3a, 3b and the roller 4, and one end P3 of the pipe P is connected to the plate. 2 so that it comes into contact with the surface 2a of 2.

Next, as shown in FIGS. 5B and 6B, the position of the roller 4 is moved along the slit hole 22 by pushing the slide plate 52 provided in the contact force adjustment section 5A, and the cylinder constituting the pipe P is moved. A part of the wall (outer peripheral surface P1) is sandwiched between a pair of round blades 3a, 3b and a roller 4. At this time, the spring member 53 provided in the contact force adjustment section 5 restores the position of the slide plate 52, and also in the direction of sliding the slide plate 52 away from the pipe P with respect to the roller 4. Generate force (elastic force). In response to such a restoring force of the spring member 53, when the user continues to push the slide plate 52 with a pressing force that exceeds the restoring force, a pair of round blades is pressed against the outer circumferential surface P1 of the pipe P. 3a and 3b maintain a contact state with a predetermined contact force, and furthermore, the roller 4 also maintains a contact state with a predetermined contact force.

Next, while holding the piping P with four-point support by the surface 2a of the plate 2, the pair of round blades 3a, 3b, and the roller 4, the piping P is removed by rotating the marking jig 1A or by rotating the piping P. A scribing line K is stamped on the outer circumferential surface P1 using a pair of round blades 3a and 3b.
By pushing the slide plate 52 as described above and restoring force of the spring member 53, the contact force of the pair of round blades 3a, 3b attached to the pair of spacers 36, 36 with respect to the outer circumferential surface P1 of the pipe P is adjusted. At the same time, a marking line K of the optimum depth is stamped on the outer peripheral surface P1.

Next, by completing the pushing down operation of the slide plate 52, the slide plate 52 slides toward the lower surface 2d of the plate 2 due to the restoring force of the spring member 53, and the roller 4 slides along the slit hole 22. do. As a result, the pair of round blades 3a, 3b and the roller 4 are separated from the outer peripheral surface P1 of the pipe P, and the pipe P is removed from the scribing jig 1A.

According to the above procedure, the marking line K can be stamped at a desired position on the outer circumferential surface P1 of the pipe P at an optimal depth using the marking jig 1A.

According to the marking jig 1A of the present embodiment and the marking method of marking lines K using the same, even if the wall thickness of the pipe P is thin, as described above, it is easy to mark the outer peripheral surface P1 of the pipe P. Moreover, it becomes possible to accurately mark the marking line K.

Here, when marking the marking line K on the outer peripheral surface P1 of the pipe P while pushing the slide plate 52 of the contact force adjustment part 5A with a finger, the contact force increases depending on the pressing force on the slide plate 52 by the user. There may also be cases where the marking line K becomes too deep. However, as in the scribing jig 1A of this embodiment, a configuration is adopted in which the spring member 53 generates a restoring force in the direction of restoring the position of the slide plate 52, that is, the direction of separating the roller 4 from the pipe P. This can prevent the user's pressing force on the slide plate 52 from becoming larger than necessary. This prevents the marking line K from becoming too deep, so even if the wall thickness of the pipe P is thin, the marking line K can be marked easily and accurately without cutting the pipe P. becomes.

<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 embodiments described above 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>
According to the scribing jig 1 (1A) of this embodiment, the contact force adjustment part 5 (5A) adjusts the contact force of the pair of round blades 3a, 3b (pair of spacers 36, 36) and the roller 4 with respect to the pipe P. By providing this, the contact force of the pair of round blades 3a, 3b with respect to the outer circumferential surface P1 of the pipe P can be optimized. As a result, even if the wall thickness of the pipe P is thin, it is possible to prevent the marking line K from forming deeply, and the wall thickness at the marking line K does not become too thin, and the pipe P This prevents the material from breaking, so there is no loss of quality.
Furthermore, by using the round blade 3 having a disk shape in plan view as the scribing means, a line contact is made between the blade portion 31 of the round blade 3 and the outer circumferential surface P1 of the pipe P, and the contact with the outer circumferential surface P1 of the pipe P is made. Contact force is uniformly and gently distributed. As a result, compared to the case where a sharp scribing needle or the like is used, the groove of the scribing line K is formed shallower, and the wear of the round blade 3 can be suppressed.Similarly to the above, the scribing line K is deep. You can prevent it from becoming too much.
Further, by using the round blade 3 having a disk shape in plan view, the posture and followability of the round blade 3 with respect to the outer circumferential surface P1 of the pipe P are stabilized. As a result, the position of the marking line K stamped on the outer circumferential surface P1 of the pipe P is stabilized without wobbling, and the usability of the marking jig 1 (1A) is also improved.
Therefore, even if the wall thickness of the pipe P is thin, the marking line K can be easily and accurately engraved on the outer peripheral surface P1 of the pipe P without impairing the quality of the pipe P, and the durability and It becomes possible to provide a marking jig 1 (1A) that is easy to use.

According to the marking jig of the present invention, as described above, even if the wall thickness of the pipe (tubular body) is thin, it is possible to easily and accurately mark the outer peripheral surface of the pipe without impairing the quality of the pipe. In addition to being able to engrave lines, it has excellent durability 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...Plate 2a...Front surface 2b...Back surface 2c...Top surface 2d...Bottom surface 2e...Side surface 22...Slit hole 3...Round blade (scoring means)
3a, 3b...Pair of round blades (round blade; scribing means)
31...Blade part 36...Spacer ((pair of) first support parts)
37... Bolt 38... Nut 4... Roller (at least one second support part)
41...Bolt 42...Nut 43...Nut (thin nut)
5,5A...Contact force adjustment section (contact force adjustment means)
51... Support plate 51a... Mounting end 51b... Screw 51c... Through hole 51d... Upper surface 51e... Lower surface 52... Slide plate (operation part)
52a... Upright plate 52b... Horizontal plate 52d... Hole portion 53, 53A, 53B... Spring member 53a... Wire rod 53b... One end 53c... Other end 54... Slide shaft (operation part)
54a...Flange J...Axis P...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,
The marking line is formed by rotating the marking jig holding the tubular body or by rotating the tubular body,
The marking jig is
a plate pressed along an end of the tubular body;
a pair of first supports attached to the plate and having an axis parallel to the axis of the tubular body ;
at least one second support attached to the plate ;
a contact means for applying a force using a spring member to bring the second support part into contact with the tubular body ;
scribing means attached to one of the first supporting parts;
The scribing means, the other first support part, and at least one second support part are in contact with the outer circumferential surface of the tubular body, so that the scribing means and the other first support part contact the tubular body. sandwiched between a support part and at least one second support part,
The scribing means includes a circular blade having a disk shape in plan view with an outer peripheral end serving as a blade, and the scribing line is stamped by the blade of the round blade coming into contact with the outer peripheral surface of the tubular body. A marking jig featuring the following. A marking jig for marking marking lines on the outer peripheral surface of a tubular body,
The marking line is formed by rotating the marking jig holding the tubular body or by rotating the tubular body,
The marking jig is
a plate pressed along an end of the tubular body;
a pair of first supports attached to the plate and having an axis parallel to the axis of the tubular body;
at least one second support attached to the plate;
a contact means for applying a force using a spring member to bring the second support part into contact with the tubular body;
scribing means attached to the pair of first supports,
The pair of marking means and the at least one second support part are in contact with the outer circumferential surface of the tubular body, so that the tubular body sandwiched by
The scribing means includes a round blade having a disk shape in plan view with an outer peripheral end serving as a blade, and the scribing line is imprinted by the blade of the round blade coming into contact with the outer peripheral surface of the tubular body. Characteristic marking jig. According to claim 1 or 2, the pair of the first support part and the second support part are attached to the plate so as to be rotatable or non-rotatable about their respective axes. The marking jig listed. The first support part is a spacer disposed between the round blade and the plate,
By changing the position of the round blade in the axial direction by replacing the first support part , the distance from the one end of the marking line stamped on the outer circumferential surface of the tubular body from one end of the tubular body is adjusted. 3. The scribing jig according to claim 1 or 2, wherein the scribing jig is provided so that the scribing jig can be provided. The abutment means slides the second support part along the plate so that the tubular body is sandwiched between the scribing means, the other first support part, and at least one second support part. an operating section that is elastic in a direction that restores the position of the operating section when the operating section is operated, and that is elastic in a direction that contacts the tubular body with respect to the second support section; the spring member being arranged to generate a force;
The scribing jig according to claim 1, characterized in that: The abutting means is an operating section capable of sliding the second support part along the plate so that the tubular body is sandwiched between the pair of scribing means and at least one second support part. and an elastic force is generated in a direction that restores the position of the operating part when the operating part is operated, and in a direction that moves the second support part away from the tubular body. and the spring member provided .
The scribing jig according to claim 2, characterized in that: The spring member is replaceable, and by replacing the spring member, the contact force of the pair of the first support portion and the second support portion with respect to the tubular body is adjusted to 5 to 20N. The scribing jig according to claim 1 or claim 2. 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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