JP2012179610A - Pipe expanding device, and method of manufacturing piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe expanding device capable of simply and surely expanding a pipe.SOLUTION: The pipe expanding device 10 includes a pair of gripping pieces 21, 22 for gripping the pipe 1, a diameter expansion section 31 for expanding the front end 2 of the pipe 1 by press-fitting it to the front end 2 of the pipe 1, and a control component 50 for controlling a projection amount of the front end 2 of the pipe 1 from one end face 23 of the gripping pieces 21, 22. The control component 50 is detachably installed to the gripping pieces 21, 22, and has a blocking plate section 51 for blocking an opening of a pipe insertion hole 24 located at a side where the front end 2 of the pipe 1 is exposed. The blocking plate section 51 includes a butting surface 510 coming in contact with the end faces 23 of the gripping pieces 21, 22, and a recessed section 520 which has a shape depressed from the butting surface 510 so as to make the front end 2 of the pipe 1 project at a designated amount h from the end faces 23 of the gripping pieces 21, 22 and can receive the front end 2 of the pipe 1.

Description

  The present invention relates to a pipe expansion device and a method for manufacturing a pipe.

  Conventionally, when metal pipes are connected to each other, a flare portion is formed at the tip of the pipe, and the sealing surface of the joint is directed to the flare portion to ensure the confidentiality of the connection portion.

JP 2008-215364 A

In creating such a flare portion, high design accuracy is required from the viewpoint of ensuring confidentiality, and a high level of skill is required by the operator. Therefore, when the flare portion is formed (when the pipe is connected), the operation cost is high, and on the other hand, there is a concern about a decrease in yield due to insufficient accuracy.
This invention is made in view of such a situation, Comprising: The pipe expansion apparatus which can implement | achieve highly accurate and highly confidential pipe connection simply, and the manufacturing method of piping using this pipe expansion apparatus are provided. For the purpose.

In order to solve the above problems, the tube expansion device of the present invention is:
A pipe expanding device for expanding the tip of a pipe,
A pipe holding portion comprising a pair of holding pieces capable of holding the pipe, and a state in which the pipe is held by the pipe holding portion, and a tip end portion of the pipe is exposed from one end face of the pipe holding portion. And a diameter-enlarged main body portion provided with a tapered diameter-expanded portion capable of expanding the diameter of the tip portion by press-fitting into the tip portion,
A regulating part that regulates the amount of protrusion of the tip of the pipe from one end face of the pipe clamping portion;
With
The pipe clamping portion includes a pipe insertion hole configured by a semicircular opening provided in a facing manner in each of the pair of clamping pieces, and the pipe clamping hole includes a pipe insertion hole. The tip portion is exposed from one end face of the pipe sandwiching portion,
The restricting part is detachably attachable to the pipe sandwiching portion in such a manner that the pipe sandwiching portion is sandwiched in the hole axial direction of the pipe insertion hole, and of the opening of the pipe insertion hole. A blocking plate that closes the opening on the side where the tip is exposed;
The closing plate portion includes a pipe clamping portion abutting surface that abuts against an end surface of the pipe clamping portion, and a pipe clamping portion abutting surface such that a tip portion of the pipe protrudes from the end surface of the pipe clamping portion by a predetermined amount. And a concave portion capable of receiving the tip end portion of the pipe.

  According to such a pipe expansion device, since the restriction part separate from the diameter expansion main body part is configured to be detachable from the diameter expansion main body part, the restriction part is separated from the diameter expansion main body part. It can be distributed and has excellent versatility. In addition, the regulating component includes a pipe holding portion contact surface and a recessed portion that is recessed from the contact surface, whereby the tip of the pipe can protrude from the end surface of the pipe holding portion by a predetermined amount. Therefore, it is possible to regulate the amount of the distal end portion that is expanded at the expanded diameter portion, and thus it is possible to uniformly expand the diameter of each pipe. In addition, since the control part can be realized only by attaching it to the pipe clamping part, the operation becomes very simple.

  In the above-described configuration, the pair of clamping pieces are pivotally supported at their fixed ends, and their free ends open and close in the rotational direction. In the pipe clamping portion, the restriction component is the pair of clamping pieces. It can be detachably attached to one of the pieces, and the other holding piece can be opened and closed with respect to the one holding piece while being attached to the one holding piece. .

  According to such a configuration, since the pair of clamping pieces can be opened and closed with the restriction part attached to the pipe gripping portion, the pipe is inserted into and removed from the pipe insertion hole with the restriction part attached. It can be attached freely. Therefore, even when the diameter of a plurality of pipes is increased, it is not necessary to attach and detach the restriction parts every time, and the workability is extremely excellent.

  The restricting component is a plate for elastically holding the one holding piece between the closing plate portion so that the restricting part can be detachably attached to one of the pair of holding pieces. A spring part can be provided.

  According to such a configuration, the regulating part can be attached to and detached from the pipe gripping portion by elastic force, and the workability at the time of attaching and detaching becomes very excellent. In addition, since the elastic mechanism for attachment / detachment is provided not in the closing plate portion that restricts the protrusion of the pipe but in the leaf spring portion that is paired with the closing plate portion, when the pipe protrudes from the pipe insertion hole and hits the restriction part In addition, the obstruction plate portion is difficult to be deformed, and it is difficult for problems such as the projection amount to be restricted.

  In addition, after the restriction part is attached to the one holding piece, the other holding piece can be rotated in the opening direction with respect to the one holding piece, and the pipe can be inserted into the pipe insertion hole. The pipe is inserted into the pipe insertion hole until the tip of the pipe contacts the concave bottom surface of the recess in the blocking plate portion of the restriction component, and the other clamping piece is After rotating the holding piece in the closing direction and holding the pipe between the pair of holding pieces, the regulating part is removed from the one holding piece and exposed from the end face of the pipe holding portion. The diameter-expanded portion may be press-fitted into the pipe to expand the diameter of the tip portion.

  Since the diameter expansion device of the present invention includes the restriction component, the diameter of the pipe can be accurately expanded by the simple mechanism as described above.

  The pipe holding portion includes a positioning concave portion or a positioning convex portion for restricting the mounting position of the restricting component, and the restricting component is fitted to the positioning concave portion or fitted with the positioning convex portion. It is possible to provide a mating recess to be mated.

  In the pipe expanding device of the present invention, in order to regulate the amount of protrusion of the pipe from the end face of the pipe gripping part with the regulating part, it is important to attach the regulating part to the pipe gripping part at an accurate position. According to the above configuration, positioning can be performed by fitting the concave and convex portions, so that positioning can be performed easily and accurately at the time of attachment and detachment, and as a result, highly accurate diameter expansion can be performed.

  Moreover, the said pipe clamping part shall be provided with two or more said pipe insertion holes from which a hole diameter differs, and the said positioning recessed part or the said positioning convex part shall be provided with respect to each of the said pipe insertion hole.

  According to such a configuration, it is possible to perform diameter expansion on a plurality of types of pipes having different pipe diameters. In addition, when the opening is closed by the blocking plate portion of the restriction component for each pipe insertion hole having a different hole diameter, the attachment position of the restriction component can be performed for each pipe insertion hole, so that the positioning is performed simply and accurately. Is possible.

  Further, in the restricting part, the concave portion of the blocking plate portion may have a width equal to or larger than the hole diameter of the plurality of pipe insertion holes having the largest hole diameter.

  In this case, since the pipe with the maximum pipe diameter can be received in the concave portion of the restricting part, it is possible to reliably regulate the protruding amount of the tip of a plurality of types of pipes having different pipe diameters.

  Next, in order to solve the above-described problem, the pipe manufacturing method of the present invention is such that the diameter of the first pipe is increased with respect to the first pipe whose tip is expanded using the above-described pipe expansion device. The second pipe is connected so that the tip of the second pipe is directed to the tip, or the second pipe is connected via the joint member so that the tip of the joint member is directed to the diameter-expanded tip of the first pipe. Two pipes are connected to obtain piping.

  By such a method, pipe connection can be realized easily and reliably, and as a result, a pipe excellent in confidentiality can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the pipe expansion apparatus which can implement | achieve highly accurate and highly confidential pipe connection simply, and the manufacturing method of piping using this pipe expansion apparatus.

It is a figure which shows the whole structure of the pipe expansion apparatus which concerns on this invention, Comprising: The perspective view which shows the state which removed the control component from the diameter expansion main-body part. It is a figure which shows the whole structure of the pipe expansion apparatus which concerns on this invention, Comprising: The perspective view which shows the state which attached the control component to the diameter expansion main-body part. It is a figure which shows the whole structure of the pipe expansion apparatus which concerns on this invention, Comprising: A perspective view which shows the state which attached the control component to the diameter expansion main-body part, and opened one of the clamping pieces. It is a figure which shows the whole structure of the pipe expansion apparatus which concerns on this invention, Comprising: A perspective view which shows the aspect which attaches a restriction part to a diameter expansion main-body part, and attaches a pipe in the state which one of the clamping pieces open | released. It is a figure which shows the whole structure of the pipe expansion apparatus which concerns on this invention, Comprising: A perspective view which shows the aspect which attaches a control component to the diameter expansion main-body part, and controls the protrusion amount at the time of insertion of a pipe. It is a figure which shows the whole pipe expansion apparatus structure concerning this invention, Comprising: The perspective view which shows the state which removed the control component from the diameter expansion main-body part in the state which attached the pipe. It is a figure which shows the whole structure of the pipe expansion apparatus which concerns on this invention, Comprising: The perspective view which shows the aspect which expands the diameter of a pipe. Sectional drawing which shows the aspect which a control component controls the protrusion amount of a pipe. Sectional drawing which shows the aspect which an enlarged diameter part expands the front-end | tip of a pipe. Sectional drawing of the pipe by which the front-end | tip part was expanded by the pipe expansion apparatus of this embodiment. The top view which shows the structure of the obstruction board part of a control component. The side view which shows the structure of the obstruction board part of a control component. The top view which shows the structure of the leaf | plate spring part of a control component. The side view which shows the structure of the leaf | plate spring part of a control component. The perspective view which shows the whole structure of a control component. The front view which shows the principal part decomposition | disassembly structure of piping manufactured using the pipe expansion apparatus which concerns on this invention. FIG. 17 is an axial sectional view of FIG. 16.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings.
The pipe expansion device 10 of this embodiment is provided with the pipe expansion main-body part 40 and the control part 50 as shown in FIGS. 1-7, The position (protrusion) of the front-end | tip part 2 of the pipe (copper pipe) 1 by the control part 50. This is a device that expands the tip portion 2 of the pipe 1 by the tube expansion main body portion 40 while regulating the amount).

The pipe expansion main body 40 includes a pipe clamping part 20 for clamping the pipe 1 and a pipe expansion mechanism part 30 for substantially expanding the tip part 2 of the pipe 1.
The pipe expansion mechanism 30 is press-fitted into the clamps 38 and 38 for supporting the pipe clamping part 20, the clamp fastening part 37 for fastening the clamps 38 and 38, and the distal end part 2 of the pipe 1 as shown in FIG. And a tapered diameter-expanding portion 31 for expanding the diameter of the distal end portion 2. The diameter-expanded portion 31 has a conical shape with a sharp tip, and is connected to the hole edge (opening edge) 24a of the pipe insertion hole 24 formed in the pipe holding portion 20 along the tapered surface. It is possible to expand the tip 2 of the. The hole edge (opening edge) 24 a of the pipe insertion hole 24 has a tapered shape that follows the outer surface shape of the enlarged diameter portion 31.

  On the other hand, the pipe gripping portion 20 includes a pair of sandwiching pieces 21 and 22 that can grip the pipe 1. As shown in FIG. 7, the pair of sandwiching pieces 21, 22 are pivotally connected to their fixed ends 215, 225, and each of the sandwiching pieces 21, 22 rotates with the pivot 29 as a fulcrum, As shown in FIGS. 3 and 4, the free ends 210 and 220 of the pair of sandwiching pieces 21 and 22 are opened and closed in a direction in which they come into contact with and away from each other (see the illustrated arrows).

  The pipe gripping part 20 constituted by the pair of sandwiching pieces 21 and 22 includes a pipe insertion hole 24 into which the pipe 1 can be inserted. Specifically, the pipe gripping portion 20 includes semicircular openings 21a and 22a provided to face the pair of sandwiching pieces 21 and 22, respectively, and the pair of sandwiching pieces 21 and 22 is free. In a state where the ends 210 and 220 are closed (for example, the state shown in FIG. 1), the pipe insertion hole 24 is configured by a combination of the openings 21a and 22a.

  Six pipe insertion holes 24 are formed so as to form a line along the longitudinal direction of the pipe gripping pieces 21, 22, and the diameter of each pipe insertion hole 24 corresponds to the difference in the pipe diameter of the pipe 1. Are different. In this embodiment, the maximum hole diameter of the pipe insertion hole 24 is 19 mm, and the minimum hole diameter is 6 mm.

  When the pipe 1 is inserted into the pipe insertion hole 24 as described above, the tip 2 of the pipe 1 is exposed from the one end surface 23 of the pipe holding part 20 through the pipe insertion hole 24 as shown in FIG. And it is possible to form the flare part 2z (refer FIG. 10) by enlarging this front-end | tip part 2 by press-fitting the enlarged diameter part 31 with respect to the front-end | tip part 2 of this exposed pipe 1. As shown in FIG. .

  By the way, in creating such a flare portion 2z, high design accuracy is required from the viewpoint of ensuring confidentiality, and a high level of skill is required for the operator. Therefore, when the flare portion 2z is formed (when expanding the tube), the operation cost is high. On the other hand, there is a concern that the yield may be lowered due to insufficient accuracy, and a device capable of simply and accurately expanding the diameter is required. From such a point of view, the tube expansion device 10 of the present embodiment includes a restriction component 50 that regulates the protruding amount of the tip portion 2 of the pipe 1 protruding from one end face 23 of the pipe clamping portion 20.

  The restriction component 50 can be detachably attached to the pipe holding portion 20 (see FIGS. 1 and 2), and can be attached to the holding piece 22 of the holding pieces 21 and 22 of the pipe holding portion 20. Has been. Specifically, it can be detachably attached to the pipe insertion hole 24 so as to sandwich the holding piece 22 with respect to the hole axial direction. The regulating component 50 includes a closing plate portion 51 that can close the opening on the side where the tip 2 of the pipe 1 is exposed (protruded) in the opening of the pipe insertion hole 24. A leaf spring portion 52 is provided to elastically hold the holding piece 22.

  As shown in FIGS. 8, 11, and 12, the closing plate portion 51 has a pipe clamping portion abutting surface 510 that abuts on the end surface 23 of the pipe clamping portion 20 (here, the clamping piece 22). A concave portion 520 having a shape depressed by a predetermined amount h from the pipe holding portion abutting surface 510 is provided so that the tip portion 2 protrudes from the end surface 23 of the pipe holding portion 20 (holding piece 22) by a predetermined amount h. And this recessed part 520 accepts the front-end | tip part 2 of the pipe 1, and accept | permits that this front-end | tip part 2 protrudes from the end surface 23 by predetermined amount h.

  As shown in FIGS. 13 and 14, the leaf spring portion 52 of the regulating component 50 includes a base end portion 52 c serving as an attachment portion to the closing plate portion 51 and an end surface 23 of the pipe clamping portion 20 (the clamping piece 22). And an abutting portion 52a that abuts by line contact. An inclined surface (guide portion) for guiding the insertion of the pipe clamping portion 20 (clamping piece 22) is provided on the tip side of the contact portion 52a, that is, on the side receiving the pipe clamping portion 20 (clamping piece 22). ) 52b is formed.

  Further, as shown in FIG. 15, the regulating component 50 is formed with a convex portion (fitting convex portion) 56 for regulating the mounting position on the pipe clamping portion 20 (the clamping piece 22). On the other hand, a positioning concave portion 28 that fits the convex portion 56 is formed on the side of the pipe sandwiching portion 20 (the sandwiching piece 22), and the state where the convex portion 56 and the concave portion 28 are fitted is a normal position. Protrusion regulation of the tip 2 of the pipe 1 by the closing plate 51 can be accurately realized.

  As described above, the pipe holding portion 20 includes a plurality of pipe insertion holes 24 having different hole diameters. In the present embodiment, a positioning recess 28 is provided for each of the pipe insertion holes 24. Accordingly, the pipe insertion hole 24 through which the pipe 1 is inserted is selected according to the pipe diameter of the pipe 1 (the pipe insertion hole 24 having a hole diameter according to the pipe diameter is selected), and the pipe insertion hole 24 is provided. By fitting the convex portion 56 to the positioning concave portion 28, the restriction component 50 can be positioned according to the pipe 1 to be used. Note that the width d (see FIG. 11) of the recess 520 provided in the closing plate portion 51 of the regulating component 50 is the hole diameter of the pipe insertion hole 24 having the largest hole diameter among the plurality of pipe insertion holes 24 (19 mm in this embodiment). It has the above width (the same value of 19 mm in this embodiment).

Now, in the diameter expansion apparatus 10 of the above structures, the pipe 1 is expanded by the following procedure.
First, as shown in FIGS. 1 to 2, the regulating component 50 is attached to one clamping piece 22 of the pair of clamping pieces 21 and 22.
Thereafter, as shown in FIG. 3, the other holding piece 21 is rotated in the opening direction (arrow direction in the drawing) with respect to the one holding piece 22 so that the pipe 1 can be inserted into the pipe insertion hole 24. To do.

After that, as shown in FIG. 4, the pipe 1 is inserted into the pipe insertion hole 24, but the distal end portion 2 of the pipe 1 is formed on the concave bottom surface 520 a of the concave portion 520 in the closing plate portion 51 of the regulating component 50. Until it touches (see Fig. 8)
Thereafter, the other holding piece 21 is rotated in the closing direction with respect to the one holding piece 22 (see FIG. 4), and the pipe 1 is held between the pair of holding pieces 21 and 22 (see FIG. 5). When the clamping piece 22 is closed and the clamping of the pipe 1 is completed, the regulating part 50 is removed from the one clamping piece 22 as shown in FIG. 6, and the pipe insertion hole into which the pipe 1 is inserted as shown in FIG. The tube expansion mechanism 30 is moved to the position of 24. In this state, as shown in FIG. 9, the diameter-expanded portion 31 is press-fitted into the pipe 1 exposed from the end face 23 of the pipe clamping portion 20, and the tip portion 2 is expanded in diameter to form the flare portion 2z.

In addition, the dimension of each component part of the obstruction board part 51 and the leaf | plate spring part 52 in the control component 50 is described below.
In FIG. 11, a = 25 mm, b = 5 mm, c = 5 mm, d = 19 mm.
In FIG. 12, e = 21.4 mm, f = 16 mm, g = 5 mm, h = 0.5 mm
In FIG. 13, i = 25 mm, j = 5 mm, k = 10 mm, l = 4 mm, m = 6 mm, n = 37 mm
In FIG. 14, o = 16 mm, p = 5 mm, q = 14 mm, r = 6 mm, θ1 = 30 °, θ2 = 6 °

  Moreover, the restriction | limiting component 50 of this embodiment uses the thing formed from carbon steel S50C about the obstruction board part 51, and processing the surface by trivalent chromium plating. About the leaf | plate spring part 52, it consists of stainless steel material SUS304-CSP3 / 4H, and the surface treatment is not given. In addition, the dimension of each component part of the obstruction board part 51 and the leaf | plate spring part 52 in the restriction | limiting part 50 described above is an example, for example, about 0.4 mm-0.5 mm about h of FIG. 12, about (theta) 2 of FIG. Is preferably 6 ° to 7 °.

  According to the tube expansion device 10 of the present embodiment as described above, since the restricting component 50 separate from the enlarged diameter main body portion 40 is configured to be detachable from the enlarged diameter main body portion 40, the restricting component 50 is provided. It can be distributed separately from the enlarged diameter main body 40 and is excellent in versatility.

  Further, the regulating component 50 includes a pipe sandwiching portion abutting surface 510 and a concave portion 520 that is recessed from the abutting surface 510, whereby the tip portion 2 of the pipe 1 is separated from the end surface 23 of the pipe sandwiching portion 20 by a predetermined amount. Since only h can be protruded, the amount of the tip portion 2 that is expanded by the expanded diameter portion 31 can be restricted, and as a result, a uniform diameter expansion can be applied to each pipe 1. ing. In addition, since the regulation can be realized only by attaching the regulating component 50 to the pipe clamping portion 20, the operation is very simple.

  In addition, since the pair of clamping pieces 21 and 22 can be opened and closed with the regulation component 50 attached to the pipe gripping portion 20 (the clamping piece 22), the pipe insertion hole 24 can be opened with the regulation component 50 attached. The pipe 1 can be removably attached. Therefore, even when the diameter of the plurality of pipes 1 is increased, it is not necessary to attach and detach the regulating component 50 every time, and the workability is extremely excellent.

  Further, since the regulating part 50 can be attached to and detached from the pipe gripping part 20 by the elastic force of the leaf spring part 52, the workability at the time of attaching and detaching is very excellent. Further, since the elastic mechanism for attachment / detachment is provided not in the closing plate portion 51 that restricts the protrusion of the pipe 1 but in the leaf spring portion 52 that is paired with the closing plate portion 51, the pipe 1 protrudes from the pipe insertion hole 24. Thus, the blocking plate portion 51 is not easily deformed when applied to the restricting component 50, and problems such as the inability to restrict the protruding amount of the pipe 1 are unlikely to occur.

  Further, when the restriction component 50 is attached to the pipe sandwiching portion 20, the positioning is realized by fitting the convex portion 56 on the restriction component 50 side and the concave portion 28 on the pipe sandwiching portion 20 side. When attaching and detaching, positioning can be performed easily and accurately, and as a result, highly accurate diameter expansion can be performed.

  Further, in the case of this embodiment, it is possible to expand the diameter of a plurality of types of pipes 1 having different tube diameters, and the pipe insertion holes 24 having different hole diameters are opened by the closing plate portion 51 of the regulating component 50. Since the positioning concave portion 28 provided for each pipe insertion hole 24 can be used to attach the restricting component 50, the positioning can be performed easily and accurately.

  In addition, the restriction component 50 is configured such that the recess 520 of the closing plate portion 51 has a width equal to or larger than the diameter of the pipe insertion hole 24 having the largest diameter among the plurality of pipe insertion holes 24. In the concave portion 520 of the restriction component 50, the pipe 1 having the largest pipe diameter can be received, and the protrusion amount of the tip end part 2 can be reliably regulated for a plurality of types of pipes 1 having different pipe diameters. .

  Using the pipe 1 expanded in the pipe expansion device 10 of the above embodiment, the pipe 1 can be connected to obtain a pipe. Specifically, as shown in FIGS. 16 and 17, with respect to the first pipe 730 a whose tip 2 is expanded in diameter, the tip of the joint member 710 ( The pipe 700 can be obtained by connecting the second pipe 730 b via the joint member 710 so as to face the seal surface 716.

  In the pipe 700 shown in FIGS. 16 and 17, the pipe joint 710 is formed of a metal material such as iron, for example, and has a flare portion 731 whose tip inner diameter is widened by the pipe expanding device 10. A joint main body 711 that coaxially connects two pipes 730a and 730b having the same diameter, and a pair of fixing members 720 that fix the connected pipes 730a and 730b to the joint main body 711, respectively.

  The joint main body 711 has a cylindrical shape, and the peripheral wall at the central portion in the length direction is a thick portion 712 having a hexagonal cross section, and peripheral walls on both sides of the thick portion 712 are fixing members 720 to be described later. Is a fixed portion 713 to which is fixed. On the outer surface of the fixed portion 713, a screw groove 714 for screwing with the screw portion 722 of the fixing member 720 is formed. Further, on the end side (both ends) of the joint body 711 to be fixed, a seal surface 716 is formed for covering the flare portions 731 of the pipes 730a and 730b to be connected. Specifically, the seal surface 716 has an inclined surface shape that narrows from the fixed portion 713 of the joint body 711 toward the distal end side. Since such a pipe 700 connects the pipes 730a and 730b and the joint 710 via the flare portion 731 formed in the pipe expansion device 10 of the present embodiment, the connection is extremely confidential. It has become a thing.

  As mentioned above, although one embodiment of the present invention has been described, the present invention is not limited to the form described with the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition to the following, various modifications can be made without departing from the scope of the invention.

  (1) In the above-described embodiment, the positioning portion 28 for restricting the mounting position of the restriction component 50 is provided in the pipe sandwiching portion 20, but a positioning protrusion may be provided instead of the recess. In this case, the restricting component 50 is formed with a fitting recess that fits with the positioning protrusion.

  (2) In the above-described embodiment, with respect to the first pipe 730a whose tip end portion 2 is expanded using the tube expansion device 10, the tip end (seal surface) 716 of the joint member 710 is directed to the tip end portion 2 The second pipe 730b is connected via the joint member 710, thereby obtaining the pipe 700. The second pipe 730b is obtained by directing the tip of the second pipe directly to the diameter-expanded tip of the first pipe. Two pipes may be connected to obtain a pipe.

  DESCRIPTION OF SYMBOLS 1 ... Pipe, 2 ... Tip part, 10 ... Pipe expansion apparatus, 20 ... Pipe clamping part, 21,22 ... Clamping piece, 21a, 22a ... Opening part, 23 ... One end face of the pipe clamping part (end face where the tip part 2 of the pipe 1 is exposed), 24... Pipe insertion hole, 31... Enlarged diameter part, 40. Parts 51: Blocking plate part 510: Pipe clamping part contact surface 520: Recessed part

Claims (9)

A pipe expanding device for expanding the tip of a pipe,
A pipe holding portion comprising a pair of holding pieces capable of holding the pipe, and a state in which the pipe is held by the pipe holding portion, and a tip end portion of the pipe is exposed from one end face of the pipe holding portion. And a diameter-enlarged main body portion provided with a tapered diameter-expanded portion capable of expanding the diameter of the tip portion by press-fitting into the tip portion,
A regulating part that regulates the amount of protrusion of the tip of the pipe from one end face of the pipe clamping portion;
With
The pipe clamping portion includes a pipe insertion hole configured by a semicircular opening provided in a facing manner in each of the pair of clamping pieces, and the pipe clamping hole includes a pipe insertion hole. The tip portion is exposed from one end face of the pipe sandwiching portion,
The restricting part is detachably attachable to the pipe sandwiching portion in such a manner that the pipe sandwiching portion is sandwiched in the hole axial direction of the pipe insertion hole. A blocking plate that closes the opening on the side where the tip is exposed;
The closing plate portion includes a pipe clamping portion abutting surface that abuts against an end surface of the pipe clamping portion, and a pipe clamping portion abutting surface such that a tip portion of the pipe protrudes from the end surface of the pipe clamping portion by a predetermined amount. And a concave portion that can receive the tip of the pipe. The pair of sandwiching pieces, the fixed ends thereof are pivotally supported, and the free ends thereof are opened and closed in the rotation direction.
In the pipe clamping portion, the restricting part can be detachably attached to one of the pair of clamping pieces, and the other clamping piece is attached to the one clamping piece, The tube expansion device according to claim 1, wherein the opening and closing is performed with respect to the sandwiching piece.   A leaf spring portion for elastically clamping the one clamping piece to and from the closing plate portion so that the regulating component can be detachably attached to one of the pair of clamping pieces. The tube expansion device according to claim 2, comprising: After attaching the regulating part to the one clamping piece,
The concave portion in the blocking plate portion of the restricting part is configured such that the other holding piece is rotated in the opening direction with respect to the one holding piece so that the pipe can be inserted into the pipe insertion hole. The pipe is inserted through the pipe insertion hole until the tip of the pipe contacts the concave bottom surface of the pipe,
The other holding piece is rotated in the closing direction with respect to the one holding piece, and after the pipe is held by the pair of holding pieces, the regulating component is removed from the one holding piece,
4. The tube expansion device according to claim 2, wherein the diameter-expanded portion is press-fitted into the pipe exposed from the end face of the pipe clamping portion to expand the diameter of the tip portion. 5. The pipe sandwiching portion includes a positioning concave portion or a positioning convex portion that regulates the mounting position of the regulating component,
The said restriction | limiting part is equipped with the fitting convex part fitted to the said positioning recessed part, or the fitting recessed part fitted to the said positioning convex part, The any one of Claims 1-4 characterized by the above-mentioned. Tube expansion equipment. The pipe clamping portion includes a plurality of pipe insertion holes having different hole diameters,
6. The tube expansion device according to claim 5, wherein the positioning concave portion or the positioning convex portion is provided for each of the pipe insertion holes.   The tube expansion device according to claim 6, wherein the restriction part has a width equal to or larger than the hole diameter of the largest hole diameter among the plurality of pipe insertion holes. .   The pipe insertion hole has a tapered shape in which the opening edge of the opening on the side where the tip end portion of the pipe is exposed has an outer surface shape of the enlarged diameter portion. The tube expansion device according to any one of claims 7 to 9.   The tip of the second pipe is connected to the tip of the first pipe whose diameter is enlarged with respect to the first pipe whose tip is enlarged using the pipe expansion device according to any one of claims 1 to 8. The second pipe is connected so as to be directed to the pipe, or the second pipe is connected via the joint member so that the tip of the joint member is directed to the diameter-expanded tip of the first pipe. A method for manufacturing a pipe, characterized by comprising:

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