JP7601382B2 - Pipe end face control tool and flare forming tool using said control tool - Google Patents

Description

The present invention relates to an improved pipe end face control device used when flaring the end of a metal pipe, and a flare forming tool using the improved control device.

Conventionally, when connecting the indoor and outdoor units of an air conditioner, it is necessary to enlarge the end of the metal pipe into a conical shape, and a flare forming tool is used as a piping tool for performing this type of flare processing.

A conventional flare forming tool includes a rotating handle, a cone shaft that is fixed to the rotating handle and has a cone attachment part at its lower end, and rotates integrally with the rotating handle, an eccentric cone for flare processing that is attached to the underside of the cone attachment part, a feed screw that is coaxially attached to the cone shaft between the rotating handle and the cone attachment part and has a male thread engraved on its outer circumferential surface, a gauge bar that has multiple pipe holding holes of different diameters, a yoke body that has a female thread at its upper part that screws into the male thread of the feed screw and a gauge bar sliding groove at its lower part through which the gauge bar is slidably inserted, and a tightening clamp that is attached to the yoke body and fixes the gauge bar inserted into the gauge bar sliding groove to the yoke body.

When using this flare forming tool to perform flaring, the gauge bar is opened to the left and right, the end of the pipe is inserted into the pipe holding hole of the gauge bar that matches the size of the pipe to be flared, the end face of the pipe is visually aligned with the top surface of the gauge bar and the gauge bar is closed. The yoke body of the flare forming tool is then moved over the pipe holding hole in which the pipe is being held, and the clamp handle is turned to lower the eccentric cone. As the conical surface of the eccentric cone rotates against the inner surface of the end of the pipe, it presses that portion against the flare processing surface provided at the opening of the pipe holding hole, spreading the end into an inverted cone shape and forming a flare at the tip of the pipe.

At this time, if the top surface of the gauge bar on the eccentric cone side does not match the end surface of the pipe held in the pipe holding hole of the gauge bar, an accurate flare will not be formed. In particular, misalignment is likely to occur when checking visually. Therefore, a flare forming tool has been proposed that includes a pipe end surface regulating device that butts the end surface of the pipe against the top surface of the gauge bar before flaring to ensure that the end surface is aligned with the top surface of the gauge bar (Patent Document 1).

Utility Model Registration No. 3198457

The pipe end face restricting tool of the flare forming tool described in Patent Document 1 is a U-shaped member that is slidably fitted into the gauge bar so as to embrace the upper and lower faces from one side of the gauge bar. The pipe end restricting piece, which is the upper piece of this pipe end face restricting tool that slides along the upper face of the gauge bar, is formed to a length that closes the pipe holding hole that opens from the sliding side face of the gauge bar to the upper face of the gauge bar. Meanwhile, the lower piece that slides along the lower face of the gauge bar is provided with a guide claw or guide pin that is slidably fitted into a guide groove provided in the longitudinal direction on the lower face of the gauge bar. The above-mentioned guide groove is dug on the back side of the gauge bar between one side and the pipe holding hole.

When using the above-mentioned flare forming tool, the end face of the pipe inserted into the pipe holding hole of the gauge bar is pressed against the pipe end regulating piece of the pipe end regulating device to align the top face of the gauge bar with the end face of the pipe, the pipe end regulating device is then shifted to a position where it does not interfere with the flaring process, and finally the gauge bar is moved to align the center of the pipe with the lower tip of the eccentric cone, and in this state the handle is turned to perform the flaring process as described above.

However, the flare forming tool described in Patent Document 1 has the following problems.
(a) In order to attach the pipe end face control device, a guide groove that did not originally exist in the gauge bar must be newly drilled by milling, which leads to increased costs, and this flare forming tool cannot use a conventional gauge bar without a guide groove. A dedicated gauge bar is required.
(b) In order to prevent the pipe end face restricting device from coming off the gauge bar, the above-mentioned guide groove and a guide pin or a folded guide tab that fits into this guide groove and slides to prevent it from coming off are required.
(c) In order for the pipe end restraints to slide smoothly along the gauge bar while being guided by the guide groove, a certain amount of clearance is required between the pipe end restraints and the gauge bar. When the pipe is inserted into the pipe holding hole of the gauge bar from below and the end face of the pipe hits the pipe end restraint piece of the pipe end restraints to position the pipe end, the pipe end restraint piece is lifted by the amount of this clearance and separated from the upper surface of the gauge bar by that amount, which leads to defective flaring.
(d) The pipe end face control device is attached so as to slide lightly onto the gauge bar and has no fixing means, so if the hand is released from the pipe end face control device during the pipe end positioning operation, it may come off from the pipe retaining hole during pipe end positioning.
(e) Since the guide groove is provided along one of the lower side edges of the gauge bar, the pipe end restriction device can only be attached to the side edge on which the guide groove is provided. In other words, both sides of the gauge bar cannot be used depending on the situation at the construction site, which is inconvenient.

The present invention was made in consideration of the problems with the conventional examples, and the object of the present invention is to provide a pipe end face regulating device that can be used with conventional gauge bars, can be attached from either side of the gauge bar, can be used according to the conditions at the construction site, and can reliably align the end face of the pipe inserted into the gauge bar with the top face of the gauge bar, and a flare forming tool equipped with said regulating device.

The invention described in claim 1 (FIGS. 5 to 7) is as follows:
The pipe end face regulating tool 1 includes a gauge bar 22 having a plurality of pipe holding holes 40 penetrating from a lower surface to an upper surface 22j and holding an end of a metal pipe P, the gauge bar 22 being slidably held, and used in a flare forming tool A that performs flaring on an end of a metal pipe P held in any one of the pipe holding holes 40 of the gauge bar 22,
The pipe end face regulating device 1 is characterized in that it has a size that protrudes into the pipe holding hole 40 along the upper surface 22j of the gauge bar 22, and is equipped with a pipe end regulating piece 2 that abuts against the end face T of the metal pipe P inserted from the underside into the selected pipe holding hole 40, and is equipped with a magnet or magnet 5 that is magnetically attracted to the gauge bar 22.

Claim 2 provides the pipe end face regulation tool 1 according to claim 1 (FIGS. 5 and 6),
The piping end face control device 1 is composed of the pipe end control piece 2, a side piece 3 arranged along one side of the gauge bar 22, and a bottom piece 4 arranged along the bottom face of the gauge bar 22, and is characterized in that the upper end of the side piece 3 is connected to one end of the pipe end control piece 2 and the lower end of the side piece 3 is connected to one end of the bottom piece 4.

The third aspect of the present invention relates to the pipe end face regulation device 1 according to the first aspect of the present invention (FIG. 7),
The piping end face control device 1 is characterized in that it is composed of the pipe end control piece 2 and a side piece 3 arranged along one side of the gauge bar 22, and the upper end of the side piece 3 is connected to one end of the pipe end control piece 2.

The invention described in claim 4 is as follows:
The flare forming tool A includes a gauge bar 22 having a plurality of pipe holding holes 40 penetrating from a lower surface to an upper surface 22j and holding an end of a metal pipe P, a yoke body 24 attached to the gauge bar 22, sliding along the longitudinal direction of the gauge bar 22, and holding a conical eccentric cone 16 that presses the end of the metal pipe P against a flare processed surface 41 of the pipe holding hole 40 to form a flare, and a pipe end face control device 1 according to any one of claims 1 to 3 that slides along the longitudinal direction of the gauge bar 22 and aligns an end face T of the metal pipe P with an upper surface 22j of the gauge bar 22 on which the flare processed surface 41 is formed.

According to the present invention, the pipe end face control device 1 is magnetically attracted to the gauge bar 22, so even if the end face T of the metal pipe P is butted against the pipe end control piece 2, the butting force will not cause any misalignment, and the end face T can be reliably aligned with the upper surface 22j of the gauge bar 22.

FIG. 2 is a perspective view showing a flare forming tool according to the present invention. 2A is a vertical cross-sectional view taken along the line X-X' in FIG. 1 during flaring processing, and FIG. 2B is a partial cross-sectional view showing the relationship between the locking pin and the locking/disengaging hole as viewed from the direction B. 2 is an enlarged view of the X-X' vertical cross section in FIG. 1 before or after flaring. FIG. 2 is a partial enlarged view of a gauge bar having a pipe end face regulating device according to the first embodiment attached thereto; 1A is a vertical cross-sectional view showing an attached state of a first embodiment of a piping end face regulating device, FIG. 1B is a plan view of the piping end face regulating device, and FIG. FIG. 11 is a vertical cross-sectional view showing an attached state of a second embodiment of a pipe end face restriction device. FIG. 11 is a vertical cross-sectional view showing an attached state of a third embodiment of a pipe end face restriction device.

Hereinafter, a detailed description will be given of a flare forming tool A according to an embodiment of the present invention with reference to the drawings. The flare forming tool A is generally composed of a gauge bar 22, a yoke body 24, a pipe end face regulating tool 1, and a mechanism portion 20.
The mechanism section 20 is composed of a rotary handle 12, a cone shaft 14, an eccentric cone 16, a feed screw 18, a pressure spring 26, and the like.

The rotary handle 12 has an outer shape of a circular block with six gripping portions 12a protruding outwardly at equal angular intervals around its periphery (see FIG. 1).
A driver hole 12b having a rectangular cross section is recessed in the center of the upper surface of the rotating handle 12 so as to coincide with the axis, and a shaft mounting hole 12c having a circular cross section is formed in the lower surface, coaxial with the driver hole 12b, and connected to the driver hole 12b.

A locking pin holding hole 12d is drilled in the vicinity of the shaft mounting hole 12c in parallel with the shaft mounting hole 12c. A locking pin 36 is inserted into the locking pin holding hole 12d so that it can slide in the direction in which it protrudes and retracts, and is biased in the extrusion direction by a coil spring 37 housed in the locking pin holding hole 12d.

The cone shaft 14 is formed of a thin shaft body 14a and a cone attachment part 14b at the lower end, which is thicker than the shaft body 14a. The upper end of the shaft body 14a is inserted into the shaft attachment hole 12c. The locking pin 36 has a groove 38 on its outer periphery, into which the tip of a retaining pin 28 attached at a right angle to the shaft body 14a is fitted, and the rotating handle 12 and the cone shaft 14 are locked and fixed so that they can move vertically together with a certain amount of play in the vertical direction. Although not shown, the locking pin 36 is provided with a rotation stopper so that it does not rotate in the locking hole 18f.

The bottom surface of the cone mounting portion 14b is provided with an inclined hole 14c inclined with respect to the cone shaft 14, into which the eccentric shaft 16a of the eccentric cone 16 is inserted for eccentric rotation via a thrust bearing 30 and a needle bearing 32. A C-shaped ring 34 is attached to the eccentric shaft 16a to prevent the eccentric shaft 16a from falling out of the inclined hole 14c. This allows the eccentric cone 16 to rotate around the central axis of the cone shaft 14. The tip of the cone-shaped eccentric cone 16 coincides with the central axis of the cone shaft 14, and the generatrix of the eccentric cone 16 is provided to coincide with the flared surface 41 of the pipe holding hole 40 of the gauge bar 22 described later.

The upper outer periphery of the cone mounting portion 14b is an engagement edge 14d for preventing it from coming loose, and engages with the stepped lower edge at the lower end of the feed screw hole 24a into which the female thread 24b of the yoke body 24, which will be described later, is threaded.

The eccentric cone 16 is composed of an eccentric shaft 16a and a conical head 16b, and the conical head 16b is exposed at an angle from the underside of the cone mounting portion 14b.

The feed screw 18 has a disk-shaped flange 18a formed on its upper part, and a body 18b that is thinner than the flange 18a is suspended from the underside of the flange 18a. A cylindrical portion 18g (with a diameter equal to or smaller than the root diameter of the male thread 18c) is provided at the insertion tip of the body 18b, and a male thread 18c is engraved between the cylindrical portion 18g and the flange 18a. The outer diameter of the cylindrical portion 18g is equal to or smaller than the root diameter of the male thread 18c, so it is formed to be slightly smaller than the inner diameter of the thread of the female thread 24b engraved in the yoke body 24 described later.

A slide hole 18d is drilled from the flange portion 18a to the middle of the body portion 18b, through which the shaft body 14a of the cone shaft 14 is inserted so as to be rotatable and slidable, and a thick spring storage hole 18e is drilled from the lower end of the slide hole 18d to the underside of the body portion 18b.

The flange portion 18a has an engagement hole 18f that penetrates vertically, and the lower end of the engagement pin 36 inserted into the engagement pin holding hole 12d fits into this engagement hole 18f.

The gauge bar 22 is made up of rod-shaped half members 22a, 22b that can be opened and closed freely, and when the half members 22a, 22b are closed, multiple pipe holding holes 40 of different diameters are formed in their mating surfaces. Therefore, each pipe holding hole 40 is formed in a half-split shape. And, on the opening edge of the pipe holding hole 40 on the upper surface 22j side of the gauge bar 22, a flare processed surface 41 that is largely chamfered into a V-shaped cross section is formed.

The yoke body 24 is formed of a gate-shaped lower part (gauge support part 24f) and a cylindrical part 24g that is integrally formed on its upper surface. A feed screw hole 24a that opens to the upper surface is drilled in the cylindrical part 24g, and a female screw 24b is drilled on the inner peripheral surface of the feed screw hole 24a.

An intermediate hole 24d with an inner diameter larger than that of the feed screw hole 24a is formed from the lower edge of the feed screw hole 24a (this part is the anti-slip step 24c that engages with the cone mounting part 14b of the cone shaft 14), and a lower hole 24e with an even larger inner diameter than that of the intermediate hole 24d is formed from the lower edge of the intermediate hole 24d, and opens into a gauge support part 24f provided at the bottom of the yoke body 24.

Here, the inner diameter of the feed screw hole 24a is smaller than the outer diameter of the cone mounting portion 14b, and the inner diameter of the intermediate hole portion 24d is slightly larger than the outer diameter of the cone mounting portion 14b, so that when the feed screw 18 is screwed back and the cone shaft 14 is pulled into the cylindrical portion 24g, the cone mounting portion 14b is stored in the intermediate hole portion 24d (see Figure 3).
A needle bearing 25 is mounted in the lower hole 24e to support the rotation of the cone mounting portion 14b.

The lower edge of the feed screw hole 24a is stepped relative to the intermediate hole portion 24d, and this stepped portion engages with the engagement edge 14d at the upper edge of the cone attachment portion 14b when the cone shaft 14 is retracted as the feed screw 18 is screwed back. At this time, the male thread 18c of the feed screw 18 unscrews from the female thread 24b of the feed screw hole 24a, and the cylindrical portion 18g, which is not threaded, rotates freely within the female thread 24b.

The compression spring 26 is stored in the spring storage hole 18e, and its upper end is in elastic contact with the ceiling of the spring storage hole 18e, and its lower end is in elastic contact with the cone mounting part 14b via the thrust bearing 27, and presses the cone shaft 14 in a direction to pull it downward from the feed screw 18.

The gauge support portion 24f of the yoke body 24 is a gate-shaped portion that penetrates the front and rear walls at the bottom of the yoke body 24 and has a gauge bar sliding groove 24h on the inner surface of both side walls through which the gauge bar 22 is inserted. The gauge bar sliding groove 24h is formed at a right angle to the central axis of the yoke body 24. A tightening clamp 42 is provided on one wall surface of this gauge support portion 24f to fix the gauge bar 22 in line with the center of rotation of the eccentric cone 16.

The pipe end face restricting tool 1 is available in various shapes as shown in Figures 5 to 7. Here, a first embodiment will be described (Figure 5).
5 is made of metal (e.g., a ferromagnetic material such as iron) and is formed into a U-shaped vertical section, with an upper piece being a pipe end restricting piece 2 that slides longitudinally on the upper surface of a gauge bar 22, and a lower piece being a bottom piece 4 that slides longitudinally on the lower surface of the gauge bar 22, and the pipe end restricting piece 2 and bottom piece 4 are connected by a side piece 3. That is, the upper end of the side piece 3 is connected to one end of the pipe end restricting piece 2, and the lower end of the side piece 3 is connected to one end of the bottom piece 4.
The distance between the tube end regulating piece 2 and the bottom piece 4 (the length of the side piece 3 ) is approximately the same as the upper and lower thicknesses of the gauge bar 22 , and is capable of sliding along the gauge bar 22 .

The length from the connection end on the side piece 3 side of the tube end restricting piece 2 to its tip is set to a length or width sufficient to cover part or all of the pipe holding hole 40 of the gauge bar 22, and the surface of the lower surface of the tube end restricting piece 2 that slides against the upper surface 22j of the gauge bar 22 is the restricting surface 2a against which the tube end T of the metal pipe P abuts. The tip of the tube end restricting piece 2 located above the pipe holding hole 40 is formed into a V-shape whose width gradually decreases toward the tip, or, although not shown, into a square, circle, etc.
A recess 3a is formed on the inner surface of the side piece 3, and a magnet 5 is attached in this recess 3a.

As shown in FIG. 4, this pipe end restriction device 1 is fitted into the gauge bar 22 from the side and is magnetically attached to the side of the gauge bar 22 by the magnet 5, and the pipe end restriction piece 2 covers the pipe holding hole 40 of the gauge bar 22 from above. In this case, the pipe end restriction device 1 can be fitted into and used from either side depending on the site.

The magnet 5 fixed to the side piece 3 of the piping end face control tool 1 has a portion magnetically attracted to the gauge bar 22 and a portion on the side piece 3 side magnetized with different polarities, and is strongly magnetically attracted to the side of the gauge bar 22.
The lower piece 4 of the magnetically attracted pipe end face control tool 1 must leave open the pipe holding hole 40 opening on the lower surface of the gauge bar 22, so its length is shorter than that of the pipe end control piece 2 and does not reach the pipe holding hole 40.

An example of a procedure for flaring the end of a metal pipe P using the flare forming tool A configured as above will be described.
With the tightening clamp 42 loosened, the gauge bar 22 is slidably inserted into the gauge bar sliding groove 24h of the yoke body 24, and the clearance between the inner dimension of the gauge bar sliding groove 24h and the width of the gauge bar 22 allows the gauge bar 22 to be opened and closed at a large angle.

First, a pipe holding hole 40 with an inner diameter that matches the metal pipe P to be flared is selected, and the yoke body 24 is moved to a position away from the pipe holding hole 40. Next, the pipe end face restricting tool 1 is moved to the pipe holding hole 40. The pipe end restricting piece 2 of the moved pipe end face restricting tool 1 closes the upper opening of the pipe holding hole 40 while in contact with the upper surface 22j of the gauge bar 22.

Then, the end of the metal pipe P is inserted from the bottom opening side into the pipe holding hole 40 in which the pipe end face control tool 1 is installed, and the end face T of the metal pipe P is butted against the pipe end control piece 2, so that the upper surface 22j of the gauge bar 22 and the end face T of the metal pipe P are aligned. At this time, even if the end face T of the metal pipe P is butted against the control surface 2a of the pipe end control piece 2 with a certain amount of force, the pipe end face control tool 1 is magnetically attracted to the gauge bar 22 by the magnet 5, so that even if there is a small gap between the gauge bar 22 and the pipe end face control tool 1 to enable sliding movement, the pipe end face control tool 1 will not shift from the gauge bar 22 due to the strong magnetic attraction, and moreover, the control surface 2a will not separate from the upper surface 22j of the gauge bar 22 due to the strong magnetic attraction, so that the upper surface 22j of the gauge bar 22 and the end face T of the metal pipe P can be aligned. Then, while still holding the metal pipe P in that state, the pipe end face control tool 1 is shifted to a position where it does not interfere with the yoke body 24. Next, the yoke body 24 is moved to directly above the pipe holding hole 40 that holds the metal pipe P.

Then, tighten the clamp 42 to firmly fix the gauge bar 22 to the yoke body 24. At this point, the center of the metal pipe P in the corresponding pipe holding hole 40 and the axis of the cone shaft 14 are aligned.

When the axes are aligned, the rotating handle 12 is rotated forward, and the rotational force of the rotating handle 12 is transmitted to the cone shaft 14. The feed screw 18 threads through the yoke body 24, moving the eccentric cone 16 toward the gauge bar 22. The end T of the metal pipe P is pushed open along the flare surface 41 by the eccentric cone 16, and flared (Figure 2).

When the rotating handle 12 is further rotated in the forward direction after the flaring of the metal pipe P is completed, the eccentric cone 16 rotates while sliding on the flared portion of the metal pipe P, and the cone shaft 14 stops in that position, but the feed screw 18 further screws forward in accordance with the forward rotation of the rotating handle 12. As a result, the engagement hole 18f of the feed screw 18 moves in the direction of coming out of the retaining pin 28 relative to the retaining pin 36, which is engaged with the retaining pin 28 and stopped in that position.

As shown in FIG. 2(b), when the retaining pin 28 is inserted through the inclined surface 36a at the lower end, the inclined surface 36a slides against the edge of the opening of the engagement hole 18f, and the retaining pin 28 is pushed up against the coil spring 37, disengaging from the engagement hole 18f and the rotating handle 12 spins freely. This stops the feed screw 18 from screwing forward, indicating the end of the flaring process.

When the flaring is completed, the rotary handle 12 is rotated counterclockwise. When the rotary handle 12 is rotated counterclockwise, as can be seen from Fig. 2(b), the elastic force of the coil spring 37 causes the side surface 36b opposite to the inclined surface 36a of the retaining pin 28 to enter the engaging/disengaging hole 18f and engage with the opening edge of the engaging/disengaging hole 18f, and the feed screw 18 is rotated counterclockwise to move in the unscrewing direction. As a result, the eccentric cone 16 is pulled up and released from the flared portion of the metal pipe P.
Then, the fastening clamp 42 is loosened, the gauge bar 22 is opened, the half members 22a, 22b are spread apart, and the flared metal pipe P is removed, completing the flaring process.

Another example of the pipe end face restraint device 1 will be described. The pipe end face restraint device 1 in Figure 5 has the magnet 5 installed on its side piece 3 as described above, but the installation position of the magnet 5 is not limited to this part and it may be installed on the pipe end restraint piece 2. If the magnet 5 is installed on the pipe end restraint piece 2, the pipe end restraint piece 2 is directly magnetically attracted to the upper surface 22j of the gauge bar 22, which is preferable to installing the magnet 5 on the side piece 3. Also, while the magnet 5 is used in the above case, the pipe end face restraint device 1 itself may be composed of a magnetic plate (Figure 6). In this case, the inner side and the outer side are magnetized with opposite poles.

In Fig. 7, the pipe end face restraint 1 is made of a magnetic plate, and the entire pipe end face restraint 1 is magnetically attracted to the top surface 22j and side surface of the gauge bar 22, with the bottom piece 4 omitted and an L-shaped cross section. Although not shown, the simplest structure of the pipe end face restraint 1 may be made of a magnetic plate, with no side piece 3, and only the pipe end restraint piece 2.

A: flare forming tool, P: metal pipe, T: end surface, 1: pipe end surface regulation tool, 2: pipe end regulation piece, 2a: regulation surface, 3: side piece, 3a: recess, 4: bottom piece, 5: magnet, 12: rotating handle, 12a: grip portion, 12b: driver hole, 12c: shaft mounting hole, 12d: locking pin holding hole, 14: cone shaft, 14a: shaft body, 14b: cone mounting portion, 14c: inclined hole, 14d: engagement edge, 16: eccentric cone, 16a: eccentric shaft, 16b: conical head, 18: feed screw, 18a: flange portion, 18b: body portion, 18c: male thread, 18d: slide hole, 18e: spring storage hole, 18f: engagement hole, 18g: cylindrical portion, 20: mechanism portion, 22: gauge bar, 22a, 22b: half body member, 22j: upper surface, 24: yoke body, 24a: feed screw hole, 24b: female thread, 24c: retaining step portion, 24d: intermediate hole portion, 24e: lower hole portion, 24f: gauge support portion, 24g: cylindrical portion, 24h: gauge bar sliding groove, 25: needle bearing, 26: pressure spring, 27: thrust bearing, 28: retaining pin, 30: thrust bearing, 32: needle bearing, 34: C-ring, 36: locking pin, 36a: inclined surface, 36b: side surface opposite to the inclined surface, 37: coil spring, 38: recessed groove, 40: pipe retaining hole, 41: flared surface, 42: fastening clamp

Claims (4)

A pipe end face regulating device for use in a flare forming tool that includes a gauge bar that penetrates from a lower surface to an upper surface and has a plurality of pipe holding holes that hold ends of metal pipes, the gauge bar being slidably held, and that performs flaring on an end of a metal pipe held in any one of the pipe holding holes of the gauge bar,
The piping end face regulating device is characterized in that it has a size that protrudes into the piping holding hole along the upper surface of the gauge bar, and is equipped with a pipe end regulating piece that abuts against the end face of a metal pipe inserted into the selected piping holding hole from the underside, and is equipped with a magnet or a magnet that is magnetically attracted to the gauge bar.
2. The piping end surface restricting device according to claim 1, characterized in that the piping end surface restricting device is composed of the pipe end restricting piece, a side piece arranged along one side of the gauge bar, and a bottom surface piece arranged along the bottom surface of the gauge bar, and an upper end of the side surface piece is connected to one end of the pipe end restricting piece, and a lower end of the side surface piece is connected to one end of the bottom surface piece.
The pipe end face regulating device according to claim 1, characterized in that the pipe end face regulating device is composed of the pipe end regulating piece and a side piece arranged along one side of the gauge bar, and an upper end of the side piece is connected to one end of the pipe end regulating piece.
4. A flare forming tool comprising: a gauge bar having a plurality of pipe retaining holes penetrating from a lower surface to an upper surface thereof and retaining an end of a metal pipe; a yoke body attached to the gauge bar, sliding along a longitudinal direction of the gauge bar, and holding a conical eccentric cone that presses an end of the metal pipe against a flared surface of the pipe retaining hole to form a flare; and the pipe end face restricting device according to any one of claims 1 to 3, sliding along the longitudinal direction of the gauge bar and aligning an end face of the metal pipe with an upper surface of the gauge bar on which the flared surface is formed.

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