JP2013188985A - Grooving apparatus and grooving method for resin tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grooving apparatus for a resin tube which suppresses deterioration in strength of the resin tube caused by forming circular groove.SOLUTION: A grooving apparatus is for forming circular grooves 31, 32 in an outer circumferential surface of a resin tube 11 to be flared and includes: a groove forming tool 3 for forming the circular grooves 31, 32 by pressing and compressing the outer circumferential surface of the resin tube 11; supporting tools 4, 5 for supporting the resin tube 11 against a force with which the groove forming tool 3 presses the outer circumferential surface of the resin tube 11; and an operation mechanism 6 for moving the groove forming tool 3 between an acting position where the groove forming tool presses the outer circumferential surface of the resin pipe 11 and a treating position where the groove forming tool is separated from the outer circumferential surface.

Description

  The present invention relates to a groove processing apparatus and a groove processing method for forming a circumferential groove at an end portion of a resin pipe connected to a pipe joint.

  In general, liquids such as various chemicals and pure water are used in the manufacturing process of semiconductors, etc., and this liquid is composed of a plurality of resin pipes formed from a resin material such as a fluororesin and a pipe joint connecting them. It is transported using. The pipe joint includes an inner cylinder and an outer cylinder, and the resin pipe is connected to the pipe joint by fitting an end of the resin pipe to the inner cylinder. In addition, in order to prevent fluid from leaking between the pipe joint and the resin pipe or the resin pipe from dropping from the pipe joint, the outer cylinder of the pipe joint has a nut that covers the outer surface of the end of the resin pipe ( Union nut) is screwed together. Specifically, the end of the resin pipe is fitted externally with the inner pipe of the pipe joint expanded in diameter (flared), and the root of the expanded diameter part (flared part) is the inner surface of the nut. And the tip of the inner cylinder. Thereby, leakage of fluid between the resin pipe and the pipe joint and dropping of the resin pipe from the pipe joint are suitably prevented.

  As described above, in order to fit the end portion of the resin pipe into the inner cylinder of the pipe joint, various techniques for flaring the end portion of the resin pipe in advance have been proposed. For example, Patent Document 1 below discloses a flare processing method in which a diameter expanding jig is inserted into an end portion of a heated resin tube to expand the end portion in advance. Further, Patent Document 1 discloses that a circumferential groove is formed by a groove cutting blade in a portion corresponding to the outer peripheral surface of the diameter expansion change portion before expanding the end portion of the resin tube. The circumferential groove is used to engage a retaining step formed on the inner surface of the nut when the nut is tightened on the pipe joint. With this circumferential groove, it is possible to reduce the tightening torque of the nut while enhancing the functions of preventing the resin pipe from falling off the pipe joint and preventing the liquid from leaking.

JP-A-6-71749

  However, in the technique of Patent Document 1, since the circumferential groove is cut by the groove cutting blade, the strength of the resin tube is remarkably reduced at the circumferential groove portion, and the resin tube does not move when the diameter expansion jig is inserted. The possibility of buckling is increased. Further, the position and shape (depth, thickness, etc.) of the circumferential groove are likely to vary depending on the operator who performs the cutting. If the position of the circumferential groove is inappropriate, the nut retaining step cannot be accurately engaged with the circumferential groove, and the tightening torque of the nut increases. Such an increase in tightening torque not only deteriorates the connection workability between the resin pipe and the pipe joint, but also causes the inner pipe tip of the pipe joint to be deformed radially inward. There is a possibility that the pull-out strength is reduced and the flow resistance of the liquid is increased. In addition, if the shape of the circumferential groove is inappropriate, the resin pipe drop-off prevention function and the liquid leakage prevention function are impaired.

  Moreover, in the said patent document 1, after forming the circumferential groove | channel in the resin pipe, flare processing is performed by heating a resin pipe and inserting a diameter expansion jig, but in order to heat a resin pipe, In addition to requiring a heating device such as a heat gun, it is necessary to secure a power source for the heating device, which limits the work environment. Therefore, it is desired to form a circumferential groove without heating the resin tube and to expand the diameter of the resin tube.

  The present invention has been made in view of the above circumstances, and a resin pipe groove processing apparatus and a groove processing method capable of suppressing a decrease in the strength of the resin pipe caused by forming a circumferential groove. The main purpose is to provide

(1) The present invention is a groove processing apparatus for forming a circumferential groove on the outer peripheral surface of a resin tube to be flared,
A groove forming tool that forms a circumferential groove by pressing and compressing the outer peripheral surface of the resin tube;
A support for supporting the resin pipe against the force by which the groove forming tool presses the outer peripheral surface of the resin pipe;
An operation mechanism for moving the groove forming tool between an operation position for pressing the outer peripheral surface of the resin pipe and a retracted position separated from the outer peripheral surface is provided.

Since the groove processing device of the present invention forms the circumferential groove by pressing and squeezing the outer peripheral surface of the resin tube with the groove forming tool, the strength of the resin tube is higher than when forming the circumferential groove by cutting. The decrease can be suppressed. Therefore, the buckling of the resin tube can be prevented when the diameter expansion jig is inserted into the resin tube after the circumferential groove is formed.
In addition, since the groove processing apparatus of the present invention includes a support tool that supports the resin pipe against the force pressing the outer peripheral surface of the resin pipe, the pressing force is reliably transmitted from the groove forming tool to the resin pipe. Circumferential grooves can be formed.

Furthermore, since the groove processing apparatus of the present invention includes an operation mechanism for moving the groove forming tool between the operation position for pressing the outer peripheral surface of the resin pipe and the retracted position separated from the outer peripheral surface, Therefore, it is possible to easily form a circumferential groove having a certain shape.
The grooving using the grooving apparatus according to the present invention may be performed before flaring the end of the resin tube, or may be performed during or after flaring.

(2) The groove forming tool presses a part of the outer peripheral surface of the resin pipe in the circumferential direction perpendicularly to the outer peripheral surface, and moves relative to the outer peripheral surface in the circumferential direction. It is preferable to have a pressing part that forms a groove.
According to this configuration, the circumferential groove can be formed on the entire outer periphery of the resin tube while pressing the outer periphery of the resin tube with a high pressure by the groove forming tool. Therefore, the circumferential groove can be suitably formed by the groove forming tool without heating the resin tube.
In order to relatively move the groove forming tool in the circumferential direction on the outer peripheral surface of the resin tube, a method of fixing the resin tube and moving the groove forming tool in the circumferential direction, fixing the groove forming tool and rotating the resin tube around There are a method of rotating in the direction, a method of rotating the resin tube toward the other side in the circumferential direction while moving the groove forming tool to the one side in the circumferential direction, and any method may be adopted.

(3) It is preferable that the said groove formation tool consists of a ring body which can roll on the outer peripheral surface of the said resin pipe in the circumferential direction, and has the said press part in the outer periphery.
According to this configuration, the groove forming tool can be relatively moved in the circumferential direction smoothly on the outer peripheral surface of the resin pipe.

(4) It is preferable that the pressing portion has a first side surface and a second side surface whose relative angle is an acute angle, and is formed in a tapered cross section.
According to this configuration, it is possible to form a circumferential groove having a substantially V-shaped cross section in which the relative angle between the pair of side surfaces is an acute angle with respect to the outer peripheral surface of the resin tube. When the resin tube is flared, the outer circumferential surface thereof is elongated in the axial direction. Therefore, when the circumferential groove is formed before the flaring process, the circumferential groove is formed in a substantially V-shaped cross section and both sides thereof are formed. The angle between the faces is an acute angle. As a result, when the end portion of the resin pipe is flared, the angle between the both side surfaces of the circumferential groove can be brought close to 90 degrees, and the circumferential groove has a shape suitable for the retaining step formed on the nut. Can be formed.

(5) The first side surface and the second side surface may be formed on inclined surfaces having an asymmetric inclination angle with respect to an imaginary line orthogonal to the rotational axis of the groove forming tool.
With this configuration, it is possible to form circumferential grooves having a substantially V-shaped cross section in which the inclination angles of the pair of side surfaces differ from each other with respect to the outer peripheral surface of the resin tube. Therefore, for example, the circumference of an appropriate shape corresponding to various conditions such as the shape of the retaining step on the nut side, the tip shape of the inner cylinder of the pipe joint, and the inclination angle of the diameter expansion change portion in the flare portion of the resin pipe Grooves can be formed.

(6) The groove forming tool preferably includes a plurality of pressing portions in the tube axis direction.
According to this structure, a circumferential groove can be formed according to the nut in which a plurality of retaining steps are formed.

(7) The plurality of pressing portions may be formed at different heights.
With this configuration, a plurality of circumferential grooves having different depths can be formed on the outer peripheral surface of the resin tube. Therefore, for example, a circumferential groove with an appropriate shape corresponding to various conditions such as the shape of the retaining step on the nut side, the tip shape of the inner tube of the pipe joint, and the inclination angle of the diameter expansion change portion in the flare portion is formed. It becomes possible to do.

(8) It is preferable that the said support tool contains the 1st support tool which supports the said resin pipe | tube from the inner peripheral side by being inserted in the inside of the said resin pipe | tube.
According to this configuration, the pressing force applied to the outer peripheral surface of the resin tube from the groove forming tool is appropriately received from the inner peripheral surface side of the resin tube by the first support tool, and the circumferential groove can be reliably formed. it can.

(9) It is preferable that the said support tool contains the 2nd support tool which supports the outer peripheral surface of the said resin pipe so that rotation around the axial center of the said resin pipe is possible.
According to this configuration, the resin tube can be smoothly rotated in a state where the outer peripheral surface of the resin tube is pressed by the groove forming tool.

(10) It is preferable that the grooving apparatus of the present invention further includes a position setting tool that sets a position in the axial direction of the resin tube with respect to the groove forming tool.
With such a configuration, it is possible to form a circumferential groove at an appropriate axial position with respect to the resin pipe, and it is possible to eliminate processing variations among workers.

(11) The present invention is a groove processing method for forming a circumferential groove on the outer peripheral surface of a resin tube to be flared,
The groove forming tool is pressed perpendicularly against a part of the outer circumferential surface of the resin tube and pressed, and the groove forming tool is moved relative to the outer circumferential surface in the circumferential direction. The circumferential groove is formed on the entire circumference.

In the groove processing method of the present invention, the circumferential groove is formed by pressing the groove forming tool against the outer peripheral surface of the resin tube and squeezing, so that the strength of the resin tube is higher than when forming the circumferential groove by cutting. Can be suppressed. Therefore, the buckling of the resin tube can be prevented when the diameter expansion jig is inserted into the resin tube after the circumferential groove is formed.
Moreover, the groove processing method of the present invention forms a circumferential groove on the entire outer peripheral surface of the resin tube while pressing a part of the outer peripheral surface of the end portion of the resin tube in the circumferential direction with a high pressure by the groove forming tool. be able to. Therefore, the circumferential groove can be suitably formed by the groove forming tool without heating the resin tube.

  The grooving using the grooving method according to the present invention may be performed before flaring the end of the resin tube, or may be performed during or after flaring. In addition, in order to move the groove forming tool in the circumferential direction relative to the outer peripheral surface of the resin tube, the resin tube is fixed and the groove forming tool is moved in the circumferential direction, or the groove forming tool is fixed and the resin tube is rotated. There is a method of rotating in the direction or rotating the resin tube to the other side in the circumferential direction while moving the groove forming tool to the one side in the circumferential direction, and any method may be adopted.

(12) It is preferable that the circumferential groove has a substantially V-shaped cross section, and an angle between both side surfaces thereof is an acute angle.
When the end portion of the resin tube is flared, the outer peripheral surface is stretched in the axial direction. Therefore, when the circumferential groove is formed before performing the flare processing, the circumferential groove is formed in a substantially V-shaped cross section and the angle between both side surfaces is an acute angle. As a result, when the end portion of the resin pipe is flared, the angle between the both side surfaces of the circumferential groove can be brought close to 90 degrees, and the circumferential groove has a shape suitable for the retaining step formed on the nut. Can be formed.

(13) The one side surface and the other side surface of the circumferential groove may be formed on an inclined surface having an asymmetric inclination angle with respect to an imaginary line perpendicular to the outer peripheral surface of the resin pipe.
With such a configuration, for example, an appropriate shape corresponding to various conditions such as the shape of the retaining step on the nut side, the tip shape of the inner tube of the pipe joint, and the inclination angle of the diameter change portion in the flare portion of the resin pipe, etc. A circumferential groove having a shape can be formed.

(14) A plurality of the circumferential grooves may be formed in the tube axis direction.
Thereby, a circumferential groove can be formed according to a nut in which a plurality of retaining steps are formed.

(15) The plurality of circumferential grooves may have different depths.
In this way, by making the depths of the plurality of circumferential grooves different from each other, the shape of the retaining step on the nut side, the tip shape of the inner tube of the pipe joint, the inclination angle of the diameter expansion change portion in the flare portion, etc. It is possible to form a circumferential groove having an appropriate shape corresponding to various conditions.

(16) In the groove processing method of the present invention, before flaring the end portion of the resin tube, the groove forming tool is pressed perpendicularly against a part in the circumferential direction on the outer peripheral surface of the resin tube, and compressed, Furthermore, when the groove forming tool is relatively moved on the outer peripheral surface in the circumferential direction, the first processing step of forming the circumferential groove on the entire periphery of the outer peripheral surface, and when flaring the end portion of the resin pipe And a second processing step of finishing the circumferential groove by fitting the second groove forming tool into the circumferential groove.
According to this configuration, not only the circumferential groove is formed before flaring the end portion of the resin pipe, but also more suitable by flaring the end portion of the resin pipe and finishing the circumferential groove at the same time. Shaped circumferential grooves can be formed. This method is particularly effective when grooving is performed without heating the resin tube.

  According to the present invention, it is possible to suppress a decrease in the strength of the resin tube due to the formation of the circumferential groove.

It is a perspective view of the groove processing apparatus of the resin pipe which concerns on embodiment of this invention. It is a longitudinal cross-sectional view of the groove processing apparatus shown by FIG. It is a front view which shows the groove formation tool of the groove processing apparatus shown by FIG. It is a front view which expands and shows the outer peripheral part of a groove formation tool. It is a side view which shows the inside of a casing, Comprising: It is a figure which shows the state which moved the groove formation tool to the retracted position. It is a side view which shows the inside of a casing, Comprising: It is a figure which shows the state which moved the groove formation tool to the action position. It is a side view which shows the positional relationship of the 1st axis | shaft-3rd axis | shaft when moving a groove formation tool to an action position. It is a side view of the flare processing apparatus used for flare processing. It is side surface sectional drawing of the flare processing apparatus shown by FIG. It is sectional drawing which expands and shows the jig for diameter expansion of the flare processing apparatus shown by FIG. It is sectional drawing explaining the process of finishing a circumferential groove | channel by the jig | tool for groove | channel formation (2nd groove | channel formation tool). It is a front view of the groove formation tool in the 2nd Embodiment of this invention. It is a front view which expands and shows the outer peripheral part of the groove forming tool. It is side surface sectional drawing which shows the state which attached the resin pipe to the piping joint. It is side surface sectional drawing which shows the malfunction example of a circumferential groove.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 14 is a side cross-sectional view showing a state where a resin pipe is mounted on a pipe joint. The resin tube 11 is made of, for example, a fluororesin such as PFA or PTFE or other synthetic resin. A flare portion 14 having an enlarged diameter is formed at the end portion 11 a of the resin tube 11. The flare portion 14 has an enlarged diameter changing portion 12 that changes so that the diameter increases toward the distal end surface 11b side of the resin tube 11, and an enlarged diameter straight portion 13 that extends in the axial direction while maintaining the enlarged diameter. And have. This flare part 14 is formed by the flare processing apparatus 10 shown by FIG. 8, for example.

  The pipe joint 15 has an inner cylinder part 16 and an outer cylinder part 17. The inner cylinder portion 16 has an outer diameter larger than the inner diameter of the resin tube 11, and the end portion 11 a of the resin tube 11 is fitted on the outer tube portion 16. The outer peripheral surface of the inner cylinder portion 16 constitutes an inner peripheral pressing portion 18 that presses the enlarged diameter straight portion 13 of the resin tube 11 from the inner peripheral surface side. The outer peripheral surface 19 of the inner cylindrical portion 16 is inclined in a tapered shape, and the outer peripheral surface 19 of the distal end is in contact with the inner peripheral surface of the diameter change portion 12 of the resin tube 11.

  The outer cylinder portion 17 is disposed with a gap on the radially outer side of the inner cylinder portion 16. In the gap between the outer cylinder portion 17 and the inner cylinder portion 16, an end portion (the diameter-enlarging straight portion 13) of the resin tube 11 that is externally fitted to the inner cylinder portion 16 is inserted. A male screw 21 for screwing the union nut 23 is formed on the outer peripheral surface of the outer cylinder portion 17.

  The union nut 23 includes a female screw 24 that can be screwed into the male screw 21, a first retaining step 25 that can act on the outer peripheral surface on the small diameter side of the diameter expansion changing portion 12 of the resin tube 11, and the diameter expansion changing portion 12. The second retaining step 26 that can act on the outer peripheral surface of the large diameter side and the outer peripheral pressing portion 27 that presses the enlarged diameter straight portion 13 of the resin tube 11 from the outer peripheral surface side. The first retaining step 25 has a first pressing surface 28 that is orthogonal to the axial direction, and the second retaining step 26 also has a second pressing surface 29 that is orthogonal to the axial direction. Yes.

  On the other hand, a first retaining step 25 is engaged with the diameter change portion 12 of the resin tube 11, and the first circumferential groove 31 pressed in the axial direction by the first pressing surface 28 and the second retaining member. A step 26 is engaged, and a second circumferential groove 32 that is pressed in the axial direction by the second pressing surface 29 is formed. The first circumferential groove 31 and the second circumferential groove 32 are obtained by denting the outer peripheral surface of the diameter-expansion changing portion 12 into a substantially L-shaped cross section. See). The first retaining step 25 and the second retaining step 26 are engaged with the first circumferential groove 31 and the second circumferential groove 32, respectively, to thereby seal between the resin pipe 11 and the pipe joint 15. And a function of preventing the resin pipe 11 from coming off from the pipe joint 15. In the present embodiment, the first and second circumferential grooves 31 and 32 can be processed (finished) not only by the groove processing device 1 but also by the flare processing device 10. Moreover, in this embodiment, the groove processing apparatus 1 (and the flare processing apparatus 10) are formed so that the first and second circumferential grooves 31 and 32 can be formed without heating the end portion 11a of the resin tube 11. ) Is configured.

<Configuration of groove processing apparatus 1>
Hereinafter, the groove processing apparatus 1 will be described in detail.
FIG. 1 is a perspective view of a resin pipe groove processing apparatus 1 according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the groove processing apparatus 1 shown in FIG. The groove processing apparatus 1 of the present embodiment forms the first and second circumferential grooves 31 and 32 in advance before forming the flare portion 14 (see FIG. 14) with respect to the end portion 11a of the resin tube 11. Used for. The groove processing device 1 includes a casing 2, a groove forming tool 3, a first support tool 4, a second support tool 5 housed in the casing 2, and an operation mechanism 6 that moves the groove forming tool 3. I have.

  The casing 2 includes a pair of side walls 2a and 2b formed in a disk shape and a cylindrical outer peripheral wall 2c that connects the outer peripheral portions of the pair of side walls 2a and 2b, and is formed in a cylindrical shape as a whole. ing. An insertion port 2d for inserting the resin pipe 11 into the casing 2 is formed at the center of one side wall 2a (axial center O of the casing 2). The outer peripheral wall 2c is formed with an opening 2e penetrating inward and outward in order to provide the operation mechanism 6.

  In the casing 2, a first support 4 is provided at the center of the other side wall 2b. The first support 4 is provided on the same axis O as the casing 2 and is formed in a cylindrical shape having an outer diameter substantially the same as or slightly smaller than the inner diameter of the resin tube 11. The distal end of the first support 4 is formed in a slightly tapered shape, and is disposed in the vicinity of the insertion port 2d formed in one side wall 2a. And the resin pipe 11 is supported from the inner peripheral side by fitting the resin pipe 11 inserted into the casing 2 from the insertion port 2d to the first support 4. Further, as shown in FIG. 2, the axial position of the resin tube 11 with respect to the groove forming tool 3 can be appropriately set by abutting the front end surface of the resin tube 11 against the other side wall 2 b. Therefore, the other side wall 2 b functions as a position setting tool that sets the axial position of the resin pipe 11 with respect to the groove forming tool 3.

  As shown in FIGS. 5 and 6, the second support 5 supports the resin tube 11 from the outer peripheral side by contacting the outer peripheral surface of the resin tube 11 fitted to the first support 4. ing. In the present embodiment, two second support tools 5 are provided, and the outer peripheral surface of the resin tube 11 is supported at two locations in the circumferential direction in a region opposite to the groove forming tool 3 with the axis O interposed therebetween. doing. The second support 5 is constituted by a roller that is rotatably provided around an axis parallel to the axis O of the first support 4. Therefore, when the resin tube 11 fitted to the first support 4 is rotated around the axis O, the second support 5 in contact with the outer peripheral surface of the resin tube 11 is also rotated.

FIG. 3 is a front view of the groove forming tool 3, and FIG. 4 is an enlarged front view showing the outer peripheral portion of the groove forming tool 3. The groove forming tool 3 is for forming the circumferential grooves 31 and 32 on the outer peripheral surface of the resin tube 11 supported by the first and second support tools 4 and 5. The groove forming tool 3 is formed of a circular body formed in a disk shape, and a pressing portion 3a for forming the circumferential grooves 31 and 32 is provided on the outer peripheral portion thereof. In this embodiment, in order to form the two circumferential grooves 31 and 32, the two pressing portions 3a are provided side by side in the axial direction. Each pressing portion 3a is formed in a tapered shape having a first inclined surface 3a1 and a second inclined surface 3a2. The first inclined surface 3a1 and the second inclined surface 3a2 are formed at substantially symmetric inclination angles with reference to a virtual line B (see FIG. 4) perpendicular to the rotation axis A of the groove forming tool 3. In the present embodiment, any of the inclined surfaces 3a1 and 3a2 is formed with inclination angles θ ₁ and θ ₂ of 20 ° to 40 ° (preferably about 30 °) with respect to the virtual line B. Therefore, the tip angle (θ ₁ + θ ₂ ) of each pressing portion 3a is formed at an acute angle of about 40 ° to 80 ° (preferably about 60 °).

  The distance d1 between the front end portions of the two pressing portions 3a is set based on the distance d2 between the front end portions (corner portions) of the first and second retaining step portions 25 and 26 of the nut 23 shown in FIG. Specifically, since the end portion 11a of the resin tube 11 is stretched by being expanded in the radial direction when the flare portion 14 is formed, the distance d1 between the tip portions of the two pressing portions 3a is equal to the elongation of the resin tube 11. In consideration of the above, it is formed shorter than the tip end interval d2 of the first and second retaining step portions 25, 26.

FIG. 5 is a side view showing the inside of the casing 2 and shows a state in which the groove forming tool 3 is moved to the retracted position, and FIG. 6 is a side view showing the inside of the casing 2 and forming the groove. It is a figure which shows the state which moved the tool 3 to the action position.
As shown in FIGS. 1, 2, 5, and 6, the operation mechanism 6 is provided in an opening 2 e formed in the outer peripheral wall 2 c of the casing 2. The operation mechanism 6 includes a support rod 6a provided movably along the radial direction of the casing 2, a link member 6b connected to one end (upper end) of the support rod 6a, and a lever connected to the link member 6b. A member 6c and a support member 6d that supports the lever member 6c are provided. The groove forming tool 3 is rotatably supported at the other end (lower end) of the support rod 6a.

  One end of the link member 6b is rotatably connected to one end of the support rod 6a via the first shaft 7a. The other end of the link member 6b is rotatably connected to the base of the lever member 6c via the second shaft 7b. The lever member 6c is rotatably connected to the support member 6d via a third shaft 7c provided at a position different from the second shaft 7b in the base portion.

  As shown in FIGS. 5 and 6, the support member 6 d is formed in a substantially L shape in a side view, and the lever member 6 c is attached to the first portion 6 d 1 disposed substantially along the radial direction of the casing 2. The support rod 6a penetrates the second portion 6d2 orthogonal to the first portion 6d1 so as to be slidable. The support member 6d is inserted into an opening 2e formed in the casing 2 and fixed. The support member 6d, the support rod 6a, the link member 6b, and the lever member 6c are attached to the casing 2 in a state assembled as one unit.

  As shown in FIG. 5, when the lever member 6c is lifted in the direction away from the outer peripheral wall 2c of the casing 2 (upward in FIG. 5) with the third shaft 7c as a fulcrum, the second shaft 7b and the first shaft 7a are interposed. The link member 6b and the support rod 6a are also lifted. Thus, the groove forming tool 3 provided at the lower end of the support rod 6a is separated from the outer peripheral surface of the resin tube 11 supported by the first and second support tools 4 and 5. Therefore, in this state, the resin tube 11 can be attached to and detached from the first and second support members 4 and 5.

  As shown in FIG. 6, when the lever member 6c is pushed down in the direction of approaching the outer peripheral wall 2c of the casing 2 (downward in FIG. 5) with the third shaft 7c as a fulcrum, the second shaft 7b and the first shaft 7a are interposed. Thus, the link member 6b and the support rod 6a are also pushed down. Thereby, the groove forming tool 3 provided at the lower end of the support rod 6a presses the outer peripheral surface of the resin tube 11 supported by the first and second support tools 4 and 5 at a certain depth, and the outer peripheral surface. Squeeze (compress).

  When the groove forming tool 3 presses the outer peripheral surface of the resin tube 11, the resin tube 11 is rotated around the axis O of the first support 4, that is, around the axis O of the resin tube 11 itself. The forming tool 3 relatively moves on the outer peripheral surface of the resin tube 11 in the circumferential direction, and the circumferential grooves 31 and 32 are formed on the entire outer periphery of the resin tube 11. Since the groove forming tool 3 is formed in a disk shape and is rotatably provided at the lower end of the support rod 6a, the groove forming tool 3 rotates together with the resin tube 11 rotating. Therefore, the resistance received from the groove forming tool 3 when the resin tube 11 is rotated can be made as small as possible. Moreover, since the 2nd support tool 5 also rotates with the resin pipe 11, the resistance received from the 2nd support tool 5 when rotating the resin tube 11 can also be made small.

  The groove forming tool 3 forms the circumferential grooves 31 and 32 by pressing and pressing the outer peripheral surface of the resin tube 11. Therefore, a decrease in the strength of the resin tube 11 can be suppressed as compared with the case where the circumferential grooves 31 and 32 are formed by cutting. Therefore, when the diameter expansion jig 38 in the flare processing apparatus 10 to be described later is inserted into the end portion 11a of the resin tube 11, the resin tube 11 does not buckle at the circumferential grooves 31, 32, Flaring can be performed appropriately.

  Moreover, since the groove | channel formation tool 3 is pressing a part of the circumferential direction in the outer peripheral surface of the resin tube 11, compared with the case where the outer peripheral surface of the resin tube 11 is simultaneously (at once) pressed by the equivalent force. Thus, a high pressure can be applied to the outer peripheral surface of the resin tube 11, and the outer peripheral surface of the resin tube 11 can be reliably squeezed by the pressure. In other words, when trying to form the circumferential grooves 31 and 32 by simultaneously pressing the entire outer peripheral surface of the resin tube 11, it is necessary to apply a very excessive force, but the resin tube 11 as in the present embodiment. By pressing a part of the outer circumferential surface of the outer circumferential surface in a circumferential direction, it is possible to form the circumferential grooves 31 and 32 by increasing the pressure even if the applied force is small. And in this embodiment, the circumferential groove | channels 31 and 32 are formed in the outer peripheral surface whole periphery of the resin pipe 11 by rotating the resin pipe 11 in the state which is pressing the outer peripheral surface of the resin pipe 11 with the groove | channel formation tool 3. Can be formed. Therefore, the circumferential grooves 31 and 32 can be suitably formed without heating the end portion 11a of the resin tube 11.

Since the first support 4 supports the resin tube 11 from the inner peripheral side, the first support 4 reliably receives the pressing force received from the groove forming tool 3 so that the resin tube 11 does not retreat from the groove forming tool 3 to the inner peripheral side. Can be supported. Further, since the casing 2 is formed in a cylindrical shape, for example, an operation of rotating the casing 2 around the axis O in a state where the resin pipe 11 is fixed may be performed.
The first support 4 may be provided so as to be rotatable around the axis O, and in this way, the resin tube 11 can be rotated with a smaller resistance.

  FIG. 7 is a side view showing the positional relationship between the first shaft 7a to the third shaft 7c when the groove forming tool 3 is moved to the operating position. When the groove forming tool 3 presses the outer peripheral surface of the resin pipe 11 by pushing down the lever member 6c, as shown in FIG. 7, the axis of the second shaft 7b is the same as the axis of the first shaft 7a. The imaginary line C passing through the axis of the third shaft 7c is slightly passed, and is positioned on the first portion 6d1 side of the support member 6d. Further, the lever member 6c is limited to being pressed downward by contacting the first portion 6d1 or by contacting the outer peripheral wall 2c of the casing 2. With such a configuration, even if the groove forming tool 3 receives a reaction force directed upward from the resin tube 11, the rising of the support rod 6 a is limited, and the pressing force by the groove forming tool 3 does not weaken. Therefore, the circumferential grooves 31 and 32 can be reliably formed on the outer peripheral surface of the resin tube 11.

  Further, when the lever member 6c is pushed down, the groove forming tool 3 is lowered by a certain amount, and the pressing amount against the resin tube 11 is also constant. Therefore, the circumferential grooves 31 and 32 are always formed at a constant depth, and there is no variation among workers. Further, the circumferential grooves 31 and 32 can be formed at fixed positions in the axial direction of the resin pipe 11 by bringing the front end surface 11 b of the resin pipe 11 into contact with the inner surface of the side wall 2 b of the casing 2. Therefore, the positions in the axial direction of the circumferential grooves 31 and 32 with respect to the resin pipe 11 do not vary by the operator. Therefore, as shown in FIG. 14, the positions of the first and second circumferential grooves 31 and 32 and the first and second retaining step portions 25 and 26 of the nut 23 are not shifted, and the first and second circumferential grooves 31 and 32 are not displaced. The sealing function and the drop-off preventing function by the second retaining steps 25 and 26 can be suitably maintained, and the tightening torque of the nut 23 can be suitably reduced.

  As described above, after forming the first and second circumferential grooves 31 and 32 in the end portion 11a of the resin pipe 11 using the groove processing apparatus 1, the resin pipe is formed using the flare processing apparatus 10 shown in FIG. 11 is subjected to flaring processing. Hereinafter, the flare processing apparatus 10 will be described in detail.

<Configuration of flare processing apparatus 10>
FIG. 8 is a side view showing the flare processing apparatus 10 used for flare processing, and FIG. 9 is a side sectional view of the flare processing apparatus 10 shown in FIG.
The flare processing apparatus 10 according to the present embodiment flares the end 11a of the resin pipe 11 connected to the pipe joint 15 as described above, and includes an apparatus main body 34 and a pipe attached to the apparatus main body 34. It mainly comprises a holding mechanism 35, a jig holding mechanism 36, and a propulsion mechanism 37. The tube holding mechanism 35 holds the resin tube 11 to be processed, and the propulsion mechanism 37 has a diameter expansion treatment for expanding the diameter of the end portion 11a of the resin tube 11 held by the tube holding mechanism 35. A tool 38 is detachably attached. Further, the jig holding mechanism 36 is formed with grooves for finishing the first and second circumferential grooves 31 and 32 formed on the outer peripheral surface of the end portion 11a of the resin tube 11 by the groove processing apparatus 1 described above. A jig (second groove forming tool) 39 (see FIG. 9) is held.

  The apparatus main body 34 includes a base portion 41, a guide portion 42 provided on the base portion 41, and a handle portion 43 attached to the base portion 41 and the guide portion 42. The base portion 41 is configured by a metal block that is long in the front-rear direction (left-right direction in FIGS. 8 and 9). A holding mechanism attaching portion 44 for attaching the tube holding mechanism 35 and the jig holding mechanism 36 is provided on the front side of the base portion 41 (left side in FIG. 8). A guide portion 42 is attached to the rear side of the base portion 41.

  As shown in FIG. 9, the tube holding mechanism 35 has a pair of upper and lower clamp members 46a and 46b configured to be openable and closable, and rubber rubber is provided on the inner peripheral surface of the pair of upper and lower clamp members 46a and 46b. Non-slip members 48a, 48b such as are attached. The tube holding mechanism 35 can hold the resin tube 11 by sandwiching the resin tube 11 between a pair of upper and lower clamp members 46a and 46b. The jig holding mechanism 36 has a pair of upper and lower clamp members 47a and 47b configured to be openable and closable, and the groove forming jig 39 is sandwiched between the pair of upper and lower clamp members 47a and 47b. Thus, the groove forming jig 39 can be held. The clamp members 46a and 46b and the clamp members 47a and 47b may be connected to each other so that they can be integrally opened and closed.

The guide part 42 is formed of a metal block. A mounting rod 50 is inserted through the guide portion 42 so as to be movable in the front-rear direction, and the guide portion 42 has a function of guiding the movement of the mounting rod 50 in the front-rear direction.
The handle portion 43 is formed by bending a metal plate material into a U-shape, and both end portions thereof are fixed to the side surfaces of the guide portion 42 and the base portion 41 with screws, pins, or the like. The handle portion 43 extends obliquely from the base portion 41 toward the rear lower side, and is formed in a shape and size that can be held by a person with one hand.

  The propulsion mechanism 37 includes an attachment rod (attachment member) 50 that is supported by the guide portion 42 so as to be movable in the front-rear direction and to which a diameter expansion jig 38 is attached at the distal end portion. The mounting rod 50 is urged rearward by an urging member 51 made of a compression coil spring. Further, the propulsion mechanism 37 includes a first propulsion unit 52 that moves (pushes) the mounting rod 50 forward, and a second propulsion unit 53 that similarly moves (pushes) the mounting rod 50 forward. Each of the first and second propulsion units 52 and 53 is a booster mechanism using a lever principle.

  The first propulsion unit 52 includes a first lever member 55 formed in a rod shape. The first lever member 55 includes a through hole 56 and a guide portion formed in the base portion 41 in the vicinity of the front side of the handle portion 43. A through hole 58 formed in 42 is inserted vertically. Further, the first lever member 55 is supported by the first pivot 57 in the left-right direction (the through-direction in FIG. 9) at the insertion portion to the through hole 56 so as to be swingable.

The upper end portion of the first lever member 55 is inserted through a slit 59 formed in the mounting rod 50 and is in contact with the engagement roller 60 provided in the slit 59 from the rear side. Further, the lower side of the first lever member 55 is the front side of the handle portion 43 and is disposed at a position where the first lever member 55 can be gripped with the handle portion 43 with one hand.
When the first lever member 55 is gripped together with the handle 43 and the lower side of the first lever member 55 is swung rearward from the first pivot 57, the upper side of the first pivot 57 is swung forward. When the engagement roller 60 is pushed forward, the mounting rod 50 moves (promotes) forward against the urging force of the urging member 51.

  The second propulsion unit 53 includes a second lever member 63 and a pressing roller (pressing member) 64. The second lever member 63 is disposed in a state in which a metal plate is bent into a U-shape and both end portions are along both side surfaces of the guide portion 42. The second lever member 63 is swingably supported by a second pivot 65 in the left-right direction provided on the rear side of the guide portion 42 and extends obliquely from the upper rear end of the guide portion 42 toward the front upper side. ing. At the rear end portion of the second lever member 63, a pressing roller 64 having a horizontal axis is rotatably provided.

  The second lever member 63 can swing in the vertical direction from the position indicated by the solid line in FIG. 9 to the position indicated by the two-dot chain line with the second pivot 65 as the starting point. Further, the second lever member 63 is biased so as to swing upward by a return spring 67 formed of a tension coil spring. The pressing roller 64 can be moved from the position indicated by the solid line in FIG. 9 to the position indicated by the two-dot chain line by the swing of the second lever member 63.

  The pressing roller 64 is disposed below the mounting rod 50 when the mounting rod 50 is in the retracted position shown in FIG. Then, when the mounting rod 50 is propelled by the first lever member 55 of the first propulsion unit 52 and the rear end of the mounting rod 50 is disposed in front of the pressing roller 64, the second lever member 63 is moved downward. The mounting rod 50 can be further propelled by the pressing roller 64 by swinging.

When the second lever member 63 is swung downward, the fixing pin 73 is fitted into the substantially L-shaped notch 70 formed at the lower edge of the second lever member 63, whereby the second lever 63 is held in a state where it is swung downward, and the pressing roller 64 can be fixed in a state where the rear end of the mounting rod 50 is pressed.
The flare processing apparatus 10 does not necessarily include the second propulsion unit 53, and the mounting rod 50 is propelled only by the first propulsion unit 52, and the end portion of the resin tube 11 is expanded by the diameter expansion jig 38. May be configured to expand the diameter.

FIG. 10 is a side cross-sectional view of the diameter expansion jig 38. The diameter expansion jig 38 detachably attached to the distal end portion of the attachment rod 50 is constituted by assembling a jig body 77, a gauge member 78, an attachment shaft 79, and an attachment cylinder 80.
The jig body 77 includes a small-diameter portion 81 formed on the front end side and a large-diameter portion 86 formed on the rear side of the small-diameter portion 81. The enlarged-diameter portion 86 is formed in a conical-shaped inclined portion 82 whose outer diameter increases in a slanting manner from the small-diameter portion 81 toward the rear, and a cylindrical shape extending from the inclined portion 82 to the rear in parallel with the axis x. And a large diameter portion 83. The jig main body 77 has a first stopper portion 84 formed on the rear side of the large diameter portion 83 and a fitting cylinder portion 85 formed on the rear side of the first stopper portion 84. .

  The small diameter portion 81 is formed in a cylindrical shape having an outer diameter that is substantially the same as or slightly smaller than the inner diameter of the resin tube 11. The inclined portion 82 has an outer diameter that is enlarged at a predetermined inclination angle with respect to the axis x, and the maximum outer diameter is formed larger than the outer diameter of the resin tube 11. The inclined portion 82 functions to push and widen the distal end portion of the resin tube 11 by the propulsion of the mounting rod 50, and forms the above-described diameter expansion changing portion 12 (see FIG. 14).

The large-diameter portion 83 is formed to have an outer diameter larger than that of the small-diameter portion 81, and holds the resin tube 11 pushed and expanded by the inclined portion 82 so that the inner diameter does not shrink. 14).
Unlike the present embodiment, the large-diameter portion 83 may be formed in a conical shape whose outer diameter slightly expands at a gentler inclination angle than the inclined portion 82. With such a configuration, even if the inner diameter of the end portion 11a of the resin tube 11 is slightly reduced when the diameter expansion jig 38 is extracted from the resin tube 11, a predetermined inner diameter dimension (the diameter expansion straight portion 13) (Inner diameter dimension) can be secured.

  The first stopper portion 84 is formed in a cylindrical shape having an outer diameter that is slightly larger than the maximum outer diameter of the large diameter portion 83. In addition, the fitting cylinder portion 85 is formed in a cylindrical shape having an outer diameter smaller than that of the first stopper portion 84. The rear end of the fitting cylinder portion 85 is open, and an attachment shaft 79 is inserted into the open end and fixed by an attachment pin 88.

  As for the gauge member 78, the rear part side (the second stopper part 95 and the fitting part 96) is fitted to the first stopper part 84 and the fitting cylinder part 85, and the front part side (the cylindrical part 94) is large. A gap 90 is disposed radially outward on the rear side of the diameter portion 83. The end portion 11 a of the resin tube 11 can be inserted into the gap 90. The gauge member 78 is provided to define an appropriate insertion amount of the diameter expansion jig 38 with respect to the end portion 11 a of the resin tube 11. That is, the diameter expansion jig is arranged such that the end surface 11b of the resin tube 11 is disposed in a range W from the front end surface 94a of the cylindrical portion 94 to the end surfaces 84a and 95a of the first stopper portion 84 and the second stopper portion 95. When 38 is inserted, the diameter expansion jig 38 is inserted into the resin tube 11 by an appropriate amount, and the end portion 11a of the resin tube 11 is flared with an appropriate axial length. In the case where the diameter expansion jig 38 is inserted into the end portion 11a of the resin tube 11 until the end surface 11b of the resin tube 11 contacts the end surface 84a of the first stopper portion 84, the gauge member 78 is provided. It can be omitted.

  The front side of the mounting tube 80 is fitted to the outer peripheral surface of the fitting tube portion 85, and is fixed to the fitting tube portion 85 together with the mounting shaft 79 by a mounting pin 88. Further, the rear end portion of the mounting cylinder 80 is fitted to the outer peripheral surface of the large-diameter head 91 formed at the tip of the mounting rod 50. Further, the rear side of the attachment shaft 79 is inserted into an attachment hole 92 formed at the tip of the attachment rod 50, and a retaining pin 93 (see FIG. 9) attached to the attachment rod 50 so as to be able to advance and retreat is attached to the attachment rod 50. Fixed to the tip.

  As shown in FIG. 9, the jig holding mechanism 36 holds a groove forming jig 39. As shown in FIG. 14, the groove forming jig 39 finishes the first circumferential groove 31 and the second circumferential groove 32 formed on the outer peripheral surface of the end portion of the resin tube 11 into a more appropriate shape. To be processed. Specifically, as shown in FIG. 11, the groove forming jig 39 is a first for forming the first circumferential groove 31 on the inner surface of the forming hole (97a, 97b) formed at the center. An annular step 98 and a second annular step 99 for forming the second circumferential groove 32 are provided. The minimum inner diameter of the molding hole 97 a on the front side of the first annular step portion 98 is formed to be substantially the same as or slightly larger than the outer diameter of the resin tube 11.

  The first annular stepped portion 98 and the second annular stepped portion 99 are formed adjacent to each other in the axial direction and have an edge bent in a substantially L shape (90 °). Further, the second annular step 99 is formed with a larger diameter than the first annular step 98. The maximum inner diameter of the molding hole 97b connected to the rear side of the second annular step portion 99 is formed to be slightly smaller than the outer diameter of the end portion 11a of the expanded resin pipe 11.

  As shown in FIG. 9, the groove forming jig 39 has an upper and lower divided structure, and the upper and lower divided bodies are an upper clamp member 47a and a lower clamp member of the jig holding mechanism 36, respectively. The resin tube 11 can be inserted into the molding hole 97 of the groove forming jig 39 by opening the clamp members 47 a and 47 b of the jig holding mechanism 36.

Next, a procedure for flaring the resin pipe 11 by the flaring apparatus 10 of this embodiment will be described.
First, as shown in FIGS. 8 and 9, a step (setting step) of holding the resin pipe 11 in the pipe holding mechanism 35 of the flare processing apparatus 10 is performed. In the present embodiment, the small diameter portion 81 of the diameter expansion jig 38 is inserted into the end portion of the resin tube 11 while the resin tube 11 is held by the tube holding mechanism 35. Thereby, the alignment of the resin tube 11 and the diameter expansion jig 38 and the alignment of the resin tube 11 in the axial direction with respect to the tube holding mechanism 35 are appropriately performed.

  Next, a propulsion process of the diameter expansion jig 38 (attachment rod 50) is performed using the first lever member 55 and the second lever member 63 of the propulsion mechanism 37. First, by operating the first lever member 55 while gripping the handle portion 43, the diameter expansion jig 38 is largely pushed forward. Accordingly, the inclined portion 82 and the large diameter portion 83 of the diameter expansion jig 38 are pushed into the resin tube 11, and the end portion 11 a of the resin tube 11 is expanded in diameter. Next, by operating the second lever member 63, the diameter expansion jig 38 is further propelled, and the diameter expansion jig 38 is pushed into the resin tube 11 with a stronger force.

  FIG. 11 is a cross-sectional view for explaining a step of finishing the circumferential grooves 31 and 32 by the groove forming jig 39. In the state shown in FIG. 11A, the inclined portion 82 of the diameter expansion jig 38 enters the molding hole 97 of the groove forming jig 39, but the resin tube 11 has the first annular step portion 98 or The second annular step 99 has not yet been pressed.

  Then, from the state shown in FIG. 11A, when the diameter-expanded portion 86 of the diameter-expanding jig 38 is further inserted into the end 11a of the resin tube 11, the inclined portion 82 of the diameter-expanding jig 38 is in the first annular shape. By approaching the stepped portion 98 and the second annular stepped portion 99, the first annular stepped portion 98 and the second annular stepped portion 99 are strongly fitted in the first and second circumferential grooves 31, 32, The first and second circumferential grooves 31 and 32 are finished.

  Thus, by using not only the groove processing apparatus 1 but also the groove forming jig 39, the first and second circumferential grooves 31 and 32 can be formed more reliably. Therefore, it becomes possible to form the circumferential grooves 31 and 32 without heating the end portion 11a of the resin tube 11, and groove processing and flare processing are performed even in a working environment without a heating device or a power source. Can do.

[Second Embodiment]
FIG. 12 is a front view of the groove forming tool 3 according to the second embodiment of the present invention, and FIG. 13 is an enlarged front view showing the outer peripheral portions (pressing portions) 3 a and 3 b of the groove forming tool 3.
In the groove forming tool 3 of the present embodiment, the shapes of the two pressing portions 3a and 3b are different from each other. Specifically, the second pressing portion 3b that is disposed on the right side (the front end surface 11b side of the resin tube 11) and that forms the second circumferential groove 32 in the resin tube 11 is disposed on the left side, and the resin tube 11 includes It is formed lower than the first pressing portion 3 a that forms the one circumferential groove 31.

Further, the pressing portions 3a, in 3b, the inclination angle theta ₁ at the right side surface (first inclined surface) 3a1, 3b1, the inclination angle theta ₂ and are mutually in the left side surface (second inclined surface) 3a2 and 3b2 Is different. That is, both side surfaces 3a1, 3b1, 3a2, 3b2 of the pressing portions 3a, 3b are formed on inclined surfaces having asymmetric inclination angles with reference to the imaginary line B (see FIG. 13). Specifically, the inclination angle theta ₁ of the right side 3a1,3b1 is about 20 °, the inclination angle theta ₂ of the left side 3a2,3b2 is about 30 °, the inclination angle of the right side 3a1,3b1 people of θ ₁ has a larger rise, it is more vertical closer. Therefore, the angle (θ ₁ + θ ₂ ) at the tip of each pressing portion 3a, 3b is about 50 °.

  The groove forming tool 3 of the present embodiment is effectively used in the following cases. For example, as shown in FIG. 15, when the end 11 a of the resin pipe 11 is fitted to the inner cylinder portion 16 of the pipe joint 15 and the nut 23 is fastened, the first retaining step 25 of the nut 23 is Although it is appropriately engaged with the bottom of the first circumferential groove 31, a gap t is formed between the second retaining step 26 and the bottom of the second circumferential groove 32. In this case, the circumferential grooves 31 and 32 are formed by, for example, the groove forming tool 3 (see FIGS. 3 and 4) of the first embodiment.

One possible cause of such a gap t is that the right side surface 31a of the first circumferential groove 31 rises slowly. In addition, it is considered that the second circumferential groove 32 is too deep and the distance between the first and second circumferential grooves 31 and 32 is too wide. The groove forming tool 3 of the present embodiment is configured to eliminate these causes, and in particular, the first pressing portion 3a with respect to the small rise of the right side surface 31a in the first circumferential groove 31. It can be accommodated by reducing the inclination angle theta ₁ of the right side surface 3a1 in. Moreover, it can respond to the 2nd circumferential groove 32 being too deep by forming the 2nd press part 3b low. Further, regarding the interval between the first and second circumferential grooves 31 and 32 being too wide, it can be dealt with by narrowing the tip end interval d1 between the first and second pressing portions 3a and 3b.

That is, the shape of the pressing portions 3a and 3b in the groove forming tool 3 and the relative relationship between the plurality of pressing portions 3a and 3b are the same as the shape of the retaining step portions 25 and 26 formed on the nut 23 and the plurality of retaining steps. It is possible to design appropriately according to various conditions such as the relative relationship between the portions 25 and 26, and as parameters thereof, the inclination angles θ ₁ and θ ₂ of the side surfaces 3a1, 3a2, 3b1, and 3b2 of the pressing portions 3a and 3b. Or the relative height of the some press part 3a, 3b, the space | interval d1, etc. can be set.

The present invention is not limited to the above-described embodiment, and can be appropriately modified within the scope of the invention described in the claims.
For example, the groove forming tool 3 of the groove processing apparatus 1 according to the above embodiment is configured by a disc-shaped ring body, but may be formed in a skid shape (sled shape) or the like. Further, in the above embodiment, the groove forming tool 3 is lowered in one step by pushing down the lever member 6c of the groove processing device 1, and the outer peripheral surface of the resin pipe 11 is pressed. However, the groove formation is divided into a plurality of steps. The tool 3 may be lowered to press the outer peripheral surface of the resin tube 11. Further, the groove forming tool 3 may include one or three or more pressing portions, and can form the pressing portions according to the number of retaining steps of the nut 23.

The flare processing apparatus 10 of the above embodiment includes a groove forming jig 39 for finishing the first circumferential groove 31 and the second circumferential groove 32 at the end of the resin tube 11 and a jig holding mechanism 36 for holding the same. However, these may be omitted and the circumferential grooves 31 and 32 may be formed only by the groove processing device 1.
Moreover, in the said embodiment, although the circumferential groove | channels 31 and 32 were formed by the groove processing apparatus 1 before carrying out the flare process of the edge part 11a of the resin pipe 11, the circumferential grooves 31 and 32 are simultaneous with or after a flare process. Can also be formed. In this case, the groove processing device 1 is provided with the groove forming tool 3 tilted with respect to the axis O so as to press the outer peripheral surface of the diameter-enlargement changing portion 12 in the flare portion 14 of the resin tube 11 vertically. it can. Moreover, when forming the circumferential grooves 31 and 32 simultaneously with the flare processing by the groove processing device 1, the groove processing device 1 may be integrated with the flare processing device 10 described above.

  The first propulsion unit 52 and the second propulsion unit 53 constituting the propulsion mechanism 37 of the flare processing apparatus 10 employ not only a mechanism using the lever principle but also a booster mechanism such as a link mechanism, a crank mechanism, and a toggle mechanism. can do. Further, when a desired propulsive force can be obtained only by the first propulsion unit 52, the second propulsion unit 53 may not necessarily be provided.

DESCRIPTION OF SYMBOLS 1 Groove processing apparatus 3 Groove forming tool (1st groove forming tool)
3a Press part 3b Press part 4 1st support tool 5 2nd support tool 6 Operation mechanism 11 Resin pipe 11a End part 14 Flare part 38 Diameter expansion jig 39 Groove shaping jig (2nd groove formation tool)

Claims (16)

A groove processing device for forming a circumferential groove with respect to the outer peripheral surface of a resin tube to be flared,
A groove forming tool that forms a circumferential groove by pressing and compressing the outer peripheral surface of the resin tube;
A support for supporting the resin pipe against the force by which the groove forming tool presses the outer peripheral surface of the resin pipe;
A groove for a resin pipe, comprising: an operation mechanism for moving the groove forming tool between an operating position for pressing the outer peripheral surface of the resin pipe and a retracted position separated from the outer peripheral surface. Processing equipment.   The groove forming tool presses a part of the outer circumferential surface of the resin tube in the circumferential direction perpendicularly to the outer circumferential surface, and forms the circumferential groove by relatively moving on the outer circumferential surface in the circumferential direction. The groove processing apparatus of the resin pipe of Claim 1 which has a press part to do.   The groove forming apparatus for a resin pipe according to claim 2, wherein the groove forming tool is formed of a ring body that can roll in the circumferential direction on the outer peripheral surface of the resin pipe, and has the pressing portion on the outer periphery thereof. .   The groove processing of the resin pipe according to claim 3, wherein the pressing portion has a first side surface and a second side surface arranged so that a relative angle is an acute angle, and is formed in a tapered cross section. apparatus.   The said 1st side surface and the said 2nd side surface are formed in the inclined surface of the asymmetrical inclination angle mutually on the basis of the virtual line orthogonal to the rotating shaft center of the said groove formation tool. Resin pipe groove processing equipment.   The groove processing apparatus for a resin pipe according to any one of claims 2 to 5, wherein the groove forming tool includes a plurality of pressing portions in a pipe axis direction.   The resin pipe groove processing device according to claim 6, wherein the plurality of pressing portions are formed at different heights.   The groove processing apparatus for a resin pipe according to any one of claims 1 to 7, wherein the support tool includes a first support tool that supports the resin pipe from an inner peripheral side by being inserted into the resin pipe. .   The groove processing apparatus for a resin pipe according to any one of claims 1 to 8, wherein the support tool includes a second support tool that rotatably supports an outer peripheral surface of the resin pipe around an axis of the resin pipe.   The groove processing apparatus for a resin pipe according to any one of claims 1 to 9, further comprising a position setting tool for setting a position of the resin pipe in an axial direction with respect to the groove forming tool. A groove processing method for forming a circumferential groove on the outer peripheral surface of a resin tube to be flared,
The groove forming tool is pressed perpendicularly against a part of the outer circumferential surface of the resin tube and pressed, and the groove forming tool is moved relative to the outer circumferential surface in the circumferential direction. A groove processing method for a resin pipe, wherein the circumferential groove is formed on the entire circumference.   12. The resin pipe groove processing method according to claim 11, wherein the circumferential groove has a substantially V-shaped cross section, and an angle between both side surfaces thereof is an acute angle.   13. The resin pipe according to claim 12, wherein one side surface and the other side surface of the circumferential groove are formed on an inclined surface having an asymmetric inclination angle with respect to an imaginary line perpendicular to the outer peripheral surface of the resin tube. Grooving method.   The resin tube groove processing method according to claim 11, wherein a plurality of the circumferential grooves are formed in the tube axis direction.   The resin pipe groove processing method according to claim 14, wherein depths of the plurality of circumferential grooves are different from each other.   Prior to flaring the end of the resin tube, the groove forming tool is pressed perpendicularly against a part of the outer circumferential surface of the resin tube to squeeze, and further, the groove is formed on the outer circumferential surface. A first processing step of forming the circumferential groove on the entire circumference of the outer peripheral surface by relatively moving the tool in the circumferential direction, and a second groove forming tool when flaring the end of the resin pipe. The groove processing method of the resin pipe in any one of Claims 11-15 including the 2nd process process which finishes the said circumferential groove by making it fit to the said circumferential groove.

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