JP6608318B2 - Joint for resin pipe and manufacturing method thereof - Google Patents

Description

  The present invention relates to a joint for resin pipes having a cylindrical core portion inserted inside a resin pipe and a method for manufacturing the joint.

  Conventionally, as this kind of joint for resin pipes, one in which an annular protrusion is formed on the outer peripheral surface of the core portion is known. In such a joint for resin pipes, with the core portion inserted into the resin tube, the resin tube is tightened from the outside with a fastening tool, thereby sealing between the inner peripheral surface of the resin tube and the outer peripheral surface of the core portion. (For example, refer to Patent Document 1).

Japanese Patent No. 5516011 (paragraphs [0018] to [0025], FIGS. 1 and 2)

  In the conventional joint for resin pipes described above, when the core part is inserted into the resin pipe, the resin pipe is deformed so as to expand outward by the protrusions formed on the outer peripheral surface of the core part. However, since this protrusion is formed in an annular shape, a portion where the resin pipe is deformed is concentrated at one place in the axial direction. As a result, there has been a problem that it is difficult to deform the resin tube and it is difficult to insert the core portion into the resin tube.

  This invention is made | formed in view of the said situation, and aims at provision of the coupling for resin pipes which can insert a core part in a resin pipe easily, and its manufacturing method.

  The invention of claim 1 made to achieve the above object has a cylindrical core portion inserted into the inside of the resin tube, and the outermost surface of the core portion is farthest from the central axis of the core portion. A joint for a resin pipe formed with an annular ridge formed by closing a portion in the circumferential direction, the annular ridge being arranged along an inclined surface inclined obliquely with respect to the axial direction of the core portion. The core portion is formed in an elliptical shape as viewed from a direction perpendicular to the inclined surface and toward the one side in the radial direction of the core portion as it goes toward the distal end side of the core portion, and the annular shape of the outer peripheral surface of the core portion The portion arranged on the base end side of the core portion with respect to the peak portion is on the base end side of the core portion with the first axis eccentric to the other side in the radial direction with respect to the center axis of the core portion. A part of the conical surface of the first cone that decreases in diameter toward the front of the outer peripheral surface of the core portion The portion disposed on the distal end side of the core portion with respect to the annular ridge portion is directed toward the distal end side of the core portion around a second axis that is eccentric to one side in the radial direction with respect to the central axis of the core portion. It is the joint for resin pipes comprised by a part of conical surface of the 2nd cone which is diameter-reduced.

  The invention of claim 2 has a cylindrical core portion inserted inside the resin tube, and a portion of the core portion farthest from the central axis of the core portion is closed in the circumferential direction on the outer peripheral surface of the core portion. A joint for a resin pipe provided with an annular ridge, wherein the annular ridge is arranged along an inclined surface inclined obliquely with respect to a central axis of the core, and heads toward a distal end side of the core. As a result, the belt is formed in an elliptical shape as viewed from a direction perpendicular to the inclined surface toward the one side in the radial direction of the core portion, and has a strip shape having a width in the axial direction of the core portion. The first edge of the portion facing the proximal end side of the core portion is directed toward the proximal end side of the core portion with a first axis eccentric to the other radial side with respect to the central axis of the core portion. Part of the line of intersection between the conical surface of the first tip-side cone that is reduced in diameter and the first plane that is substantially parallel to the inclined surface A first base end that is reduced in diameter toward a base end side of the core portion with a first front end side curved portion and a first intermediate shaft that is eccentric to the center axis side of the core portion with respect to the first axis. A conical surface of a side cone and a first base-side curved portion that is a part of a line of intersection of the first plane are formed continuously, and the core portion of the annular ridge portion is formed. The second end side facing the distal end side is a second proximal end side whose diameter is reduced toward the distal end side of the core portion with a second axis eccentric to one side in the radial direction with respect to the central axis of the core portion. A second base end side formed by a part of a line of intersection between a conical surface of a cone and a second plane that is substantially parallel to the inclined surface and located on the tip side of the core portion with respect to the first plane. A second portion that decreases in diameter toward the distal end side of the core portion with a curved portion and a second intermediate shaft that is eccentric to the central axis side of the core portion with respect to the second axis. And the conical surface of the end-side conical, and the second plane, and a second distal end curved portion which is composed of a part of the lines of intersection, but a joint resin tube is formed by leading to a series.

  According to a third aspect of the present invention, an annular ridge portion is formed on the outer peripheral surface of a cylindrical core portion inserted inside the resin tube, and a portion farthest from the central axis of the core portion is closed in the circumferential direction. A method for producing a joint for a resin pipe, wherein a large diameter portion having the same diameter as the annular ridge portion or a larger diameter than the annular ridge portion is formed in the core portion, and an outer peripheral portion of the large diameter portion is formed. Cutting to form an elliptical annular ridge having a long axis that obliquely intersects with the central axis of the core portion, and toward the one side in the radial direction toward the distal end side of the core portion. And cutting the outer peripheral portion of the large-diameter portion while rotating the core portion about a first axis that is eccentric to the other side in the radial direction with respect to the central axis of the core portion. The blade is moved in the axial direction of the core portion, and the distance from the first axis of the cutting blade is set to the core portion. One of the conical surfaces of the first cone that is shortened from the distal end side toward the proximal end side and is reduced in diameter toward the proximal end side of the core portion at a portion of the large diameter portion that faces one side in the radial direction. Forming the first inclined curved surface that is a portion, and rotating the core portion around a second axis that is eccentric to one side in the radial direction with respect to the central axis of the core portion, And the distance from the second axis of the cutting blade is shortened from the proximal end side to the distal end side of the core portion, and is directed to the other radial side of the large diameter portion. Forming a second inclined curved surface that is a part of a conical surface of a second cone that decreases in diameter toward the distal end side of the core portion, and the annular ridge portion includes the first inclined surface Method for manufacturing joint for resin pipe formed as boundary line between curved surface and second inclined curved surface A.

  According to a fourth aspect of the present invention, an annular ridge portion is formed on the outer peripheral surface of a cylindrical core portion inserted inside the resin tube, and a portion farthest from the central axis of the core portion is closed in the circumferential direction. A method for producing a joint for a resin pipe, wherein a large diameter portion having the same diameter as the annular ridge portion or a larger diameter than the annular ridge portion is formed in the core portion, and an outer peripheral portion of the large diameter portion is formed. Cutting has a long axis that obliquely intersects the central axis of the core part, and goes toward one side of the first radial direction perpendicular to the central axis of the core part as it goes to the tip side of the core part Forming the elliptical annular ridge portion, and cutting the outer peripheral portion of the large-diameter portion is eccentric to the other side in the first radial direction with respect to the central axis of the core portion The cutting blade is moved in the axial direction of the core portion while rotating the core portion around the first axis, and the The distance from the first axis of the cutting blade to the proximal end side of the core portion is shortened toward the proximal end side of the core portion on the distal end side from the first intermediate position located in the middle in the axial direction of the diameter portion, and the large diameter portion A first tip-side inclined curved surface that is a part of the conical surface of the first tip-side cone that decreases in diameter toward the base end side of the core portion. And moving the cutting blade in the axial direction of the core portion while rotating the core portion about a second axis that is eccentric to one side in the first radial direction with respect to the central axis of the core portion. The distance from the second axis of the cutting blade toward the distal end side of the core portion is closer to the proximal end side than the second intermediate position located on the distal end side relative to the first intermediate position in the large diameter portion. And shorten toward the other side in the first radial direction of the large-diameter portion. Forming a second base-side inclined curved surface that is a part of a conical surface of a second base-side cone that decreases in diameter toward the tip side of the core portion, and the core more than the first shaft The cutting blade is moved in the axial direction of the core portion while rotating the core portion about the first intermediate shaft that is eccentric to the central axis side of the portion, and the base portion is moved from the first intermediate position of the large diameter portion. On the end side, the distance from the first intermediate shaft of the cutting blade is shortened toward the base end side of the core portion, and the central axis of the core portion and the first radial direction among the large diameter portions And a portion of the conical surface of the first base end side cone that decreases in diameter toward the base end side of the core portion at a portion opposed in the second radial direction orthogonal to both of the first diameter and the first diameter An edge that faces the other side of the direction faces the other side of the first radial direction of the first tip side inclined curved surface Forming a pair of first base end-side inclined curved surfaces connected to the edges, and rotating the core portion around a second intermediate shaft that is eccentric to the central axis side of the core portion relative to the second shaft. The cutting blade is moved in the axial direction of the core portion, and the distance from the second intermediate shaft of the cutting blade is set to the distal end side of the core portion on the distal end side of the second intermediate position in the large diameter portion. It is configured to be a part of a conical surface of a second tip-side cone that is shortened toward the side and is reduced in diameter toward the tip side of the core portion at a portion facing the second radial direction in the large-diameter portion. And a pair of second distal-side inclined curved surfaces in which an edge facing one side in the first radial direction is connected to an edge facing one side in the first radial direction in the second proximal-side inclined curved surface. Forming the annular ridge portion in the large-diameter portion, Edges of the first base-side inclined curved surface and the first tip-side inclined curved surface facing the other side in the first radial direction, the pair of second tip-side inclined curved surfaces and the second base-side inclined curved surface And a manufacturing method of a joint for resin pipes formed at a portion sandwiched between end edges facing one side in the first radial direction.

  In the joint for resin pipes according to the present invention, the annular ridge formed on the outer peripheral surface of the core part inserted inside the resin pipe is formed in an elliptical shape arranged obliquely with respect to the central axis of the core part. Yes. Therefore, when the core portion is inserted into the resin tube, the portion where the resin tube is expanded outward by the annular ridge portion is dispersed in the axial direction of the resin tube. Thereby, the resin tube is easily deformed, and the core portion can be easily inserted into the resin tube.

  In the resin pipe joint according to the first and third aspects of the present invention, the diameter of the outer peripheral surface of the core portion that is disposed on the tip side with respect to the annular ridge portion is reduced toward the tip side of the core portion. Since a part of the conical surface of the second cone is provided, when the core portion is inserted into the resin tube and the resin tube gets over the annular ridge, the resin tube is gradually moved outward by the conical surface of the second cone. It becomes possible to expand the core, and the core part can be easily inserted into the resin pipe.

  Furthermore, in the joint for resin pipes according to the first and third aspects of the invention, the annular ridge portion has an elliptical shape toward the one side in the radial direction of the core portion toward the tip end side of the core portion, and the outer periphery of the core portion. The portions of the surface that are disposed on the proximal end side and the distal end side of the core portion with respect to the annular ridge portion are part of the conical surface of the first cone that decreases in diameter toward the proximal end side, and toward the distal end side. And a part of the conical surface of the second cone that is reduced in diameter. According to the structure of the resin pipe joint according to the first and third aspects of the invention, it is possible to form the annular ridge portion by performing cutting in the following manner. That is, a large-diameter portion having the same diameter as the annular ridge portion or a larger diameter than the annular ridge portion is formed in the core portion, and the first axis that is eccentric to the other side in the radial direction with respect to the central axis of the core portion is the center. By moving the cutting blade so as to form the first cone, a part of the conical surface of the first cone is formed in a portion of the large diameter portion facing one side in the radial direction, and the central axis of the core portion is formed. On the other hand, by moving the cutting blade so as to form a second cone centering on the second axis that is eccentric to one side in the radial direction, the second cone is formed on the portion of the large diameter portion that faces the other side in the radial direction. It is possible to form a part of the conical surface and to form the annular ridge portion having the shape described above (method for manufacturing a joint for resin pipes according to the invention of claim 3).

  In the resin pipe joint according to the second and fourth aspects of the present invention, the diameter of the outer peripheral surface of the core portion, which is disposed on the distal end side with respect to the annular ridge portion, is reduced toward the distal end side of the core portion. Since a part of the conical surface of the second tip side cone and a part of the conical surface of the second base side cone are provided, when the core portion is inserted into the resin tube and the resin tube gets over the annular ridge In addition, the resin tube can be gradually expanded outward by the conical surface of the second distal-end-side cone and the conical surface of the second proximal-end-side cone, and the core portion can be easily inserted into the resin tube. Moreover, since the annular ridge portion has a band shape having a width in the axial direction of the core portion, the seal with the resin tube can be stabilized.

  Furthermore, in the joint for resin pipes according to the inventions of claims 2 and 4, the annular ridge portion is formed in an elliptical shape toward one side in the radial direction of the core portion as it goes to the tip side of the core portion. It has a strip shape with a width in the axial direction. And the 1st end edge which faces the base end side of a core part among cyclic | annular ridge parts cross | intersects the conical surface of the 1st front end side cone diameter-reduced toward the base end side of a core part, and the central axis of a core part. The first tip-side curved portion, which is a part of the intersection line with the first plane, and the intersection line between the conical surface of the first base-side cone and the first plane, the diameter of which decreases toward the base end side of the core portion. The first base end side curved portion which is a part is formed in a continuous manner. The second edge facing the distal end side of the core portion of the annular ridge portion is a second plane intersecting with the conical surface of the second proximal end cone whose diameter decreases toward the distal end side of the core portion and the central axis of the core portion. A part of the line of intersection between the second base-side curved portion constituted by a part of the line of intersection with the second cone and the conical surface of the second tip-side cone and the second plane, the diameter of which decreases toward the tip side of the core part And the second distal end side curved portion constituted by the continuous connection. According to the structure of the resin pipe joint according to the second and fourth aspects of the present invention, it is possible to form the annular ridge portion by performing cutting in the following manner. That is, first, a large-diameter portion having the same diameter as the annular ridge portion or a larger diameter than the annular ridge portion is formed in the core portion, and the first decentered to the other side in the first radial direction with respect to the central axis of the core portion. By moving the cutting blade so as to form a first tip-side cone centering on the axis, a conical surface of the first tip-side cone is formed at a portion facing the one radial direction in a portion near the tip of the large-diameter portion. A first distal-side inclined curved surface formed of a part of the core portion and a second proximal-side cone centered on a second axis eccentric to one side in the first radial direction with respect to the central axis of the core portion By moving the cutting blade in such a manner, the second base formed by a part of the conical surface of the second base end side cone in the portion facing the other side in the first radial direction in the base end portion of the large diameter portion. An end inclined curved surface is formed. Next, the base end of the large diameter portion is moved by moving the cutting blade so as to form a first base end side cone centering on the first intermediate shaft that is eccentric to the center axis side of the core portion with respect to the first axis. The portion that is opposed to the second radial direction in the side portion is constituted by a part of the conical surface of the first base-end-side cone, and the edge that faces the other side in the first radial direction is on the first tip-side inclined curved surface A pair of first proximal-side inclined curved surfaces connected to an edge facing the other side in the first radial direction are formed, and a second intermediate shaft that is eccentric to the central axis side of the core portion with respect to the second axis is the center. By moving the cutting blade so as to form the second tip side cone, the portion close to the tip of the large diameter portion is configured to be a part of the conical surface of the second tip side cone at a portion facing in the second radial direction. And a pair of first edges in which the edges facing one side in the first radial direction are connected to the edges facing one side in the first radial direction on the second base-side inclined curved surface Forming the tip end side inclined surface. As described above, of the large-diameter portion, the edge that faces the other side of the first radial direction in the first distal-side inclined curved surface and the pair of first proximal-side inclined curved surfaces, the second proximal-side inclined curved surface, and 1 An annular ridge portion is formed in a portion sandwiched between the pair of second tip-side inclined curved surfaces and an end edge facing one side in the first radial direction (manufacture of a joint for resin pipes according to the invention of claim 4) Method).

Side sectional view which shows the connection structure with the resin pipe of the joint for resin pipes concerning 1st Embodiment Perspective view of resin pipe joint, fastener, and resin pipe (A) Side view of joint for resin pipes, (B) Viewed from the tip side (A) perspective view of joint for resin pipe, (B) perspective view seen from another direction (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes Side sectional view which shows the connection structure with the resin pipe of the joint for resin pipes concerning 2nd Embodiment (A) Side view of joint for resin pipes, (B) Viewed from the tip side (A) perspective view of joint for resin pipe, (B) perspective view seen from another direction (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes 14A is a side view of the joint for resin pipe shown in FIG. 14A viewed from the first radial direction, and FIG. (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes 16A is a side view of the joint for resin pipe shown in FIG. 16A viewed from the first radial direction, and FIG. (A) Cross-sectional view of large-diameter portion before first tip side inclined curved surface is formed, (B) Cross-sectional view of large-diameter portion after first tip-side inclined curved surface is formed. (A) Cross-sectional view of large-diameter portion before first base-side inclined curved surface is formed, (B) Cross-sectional view of large-diameter portion after first base-side inclined curved surface is formed. Side view of joint for resin pipe according to another embodiment

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG.1 and FIG.2, the joint 10 for resin pipes of this embodiment comprises the cylinder shape which has the center hole 11, has the apparatus connection part 12 in the one end side of an axial direction, and apparatus connection in the other end side The core portion 15 is smaller in diameter than the portion 12. The device connection unit 12 is connected to, for example, a piping device (not shown). The core portion 15 is inserted inside the resin tube 50. Then, in a state where the core portion 15 is inserted inside the resin tube 50, the resin tube 50 is tightened with the clip 51 from the outside, whereby the space between the inner surface of the resin tube 50 and the resin tube joint 10 is sealed. In the following description, the core 15 side of the resin pipe joint 10 is appropriately referred to as a distal end side, and the device connecting portion 12 side is appropriately referred to as a proximal end side.

  At the end of the device connecting portion 12 on the tip end side (core portion 15 side), a flange portion 13 protruding outward is provided. A male screw portion 14 is formed on the outer peripheral surface of the device connection portion 12 at the base end side portion from the flange portion 13. The flange portion 13 is formed in a hexagonal shape so that the resin pipe joint 10 can be rotated by a jig such as a wrench when the device connection portion 12 is connected to a screw hole (not shown) of the piping device. ing.

  An annular groove 16 is formed on the outer peripheral surface of the distal end portion of the core portion 15. A portion of the core portion 15 that is disposed on the tip side from the annular groove 16 constitutes an annular tip protrusion 17. In order to facilitate the insertion of the resin pipe joint 10 into the resin pipe 50, the tip protrusion 17 has a tapered shape that decreases in diameter toward the tip side of the core part 15.

  As shown in FIGS. 3A and 3B, the outer peripheral surface of the core portion 15 has an annular ridge formed by closing a portion farthest from the central axis J <b> 1 of the core portion 15 in the circumferential direction of the core portion 15. Part 20 is formed. The annular ridge portion 20 has a larger diameter than the above-described tip protrusion 17, and contacts the inner surface of the resin tube 50 over the entire circumferential direction when the resin tube joint 10 is inserted into the resin tube 50. . In other words, the annular ridge 20 is a portion that seals between the inner surface of the resin pipe 50 in the resin pipe joint 10.

  As shown in FIG. 3A, the annular ridge portion 20 is disposed along an inclined surface K1 that is inclined with respect to the central axis J1 of the core portion 15, and is viewed from a direction perpendicular to the inclined surface K1. The ellipse is formed in an ellipse shape (specifically, the major axis of the ellipse is inclined with respect to the central axis J1 of the core portion 15). Specifically, the annular ridge portion 20 has a radial direction of the core portion 15 toward the distal end side of the core portion 15 when viewed from the minor axis direction of the ellipse (the depth direction in FIG. 3A). It inclines so that it may go to one side (upper side in FIG. 3 (A)). In addition, it is preferable that the length of the annular ridge portion 20 in the direction of the central axis J1 of the core portion 15 is a length that fits within a range in which the clip 51 tightens the resin pipe 50.

  As shown in FIG. 3A and FIG. 4A, a first diameter that decreases toward the base end side of the core portion 15 is formed on the base end side of the annular ridge portion 20 in the outer peripheral surface of the core portion 15. A first inclined curved surface 21 that is a part of the conical surface 31 (see FIG. 6B) is formed. Further, as shown in FIGS. 3A and 4B, the second diameter of the outer peripheral surface of the core portion 15 is reduced toward the distal end side of the core portion 15 on the distal end side of the annular ridge portion 20. A second inclined curved surface 22 that is a part of the conical surface 32 (see FIG. 7B) is formed. A ridge line between the first inclined curved surface 21 and the second inclined curved surface 22 is an annular ridge portion 20.

  As shown in FIG. 6 (B), the first conical surface 31 is an outer peripheral surface of a cone centering on the first shaft 31J that is eccentric to the other side in the radial direction with respect to the central axis J1 of the core portion 15. Yes. In the example of the present embodiment, the amount of eccentricity ΔX1 of the first shaft 31J with respect to the central axis J1 is a reduced diameter by which the first conical surface 31 is reduced by the length of the first inclined curved surface 21 in the axial direction of the core portion 15. It is substantially the same as the amount ΔR1. As shown in FIG. 7B, the second conical surface 32 is an outer peripheral surface of a cone centering on the second shaft 32J that is eccentric to one side in the radial direction with respect to the central axis J1 of the core portion. ing. In the example of the present embodiment, the amount of eccentricity ΔX2 of the second shaft 32J with respect to the central axis J1 is the diameter of the second conical surface 32 that is reduced by the length of the second inclined curved surface 22 in the axial direction of the core portion 15. It is substantially the same as the amount ΔR2. In the present embodiment, the amount of eccentricity ΔX1 of the first shaft 31J relative to the central axis J1 and the amount of eccentricity ΔX2 of the second shaft 32J relative to the central axis J1 are the same size.

  The description regarding the structure of the joint 10 for resin pipes is above. Next, the manufacturing method of the joint 10 for resin pipes is demonstrated.

  To manufacture the resin pipe joint 10, first, as shown in FIGS. 5A and 5B, a pre-process joint 40 that is different from the resin pipe joint 10 only in the structure of the core portion 15 is prepared. Specifically, in the joint 40 before processing, the core portion 15 has a large-diameter portion 41 at an intermediate portion in the axial direction, and the annular groove 16 and the distal-end protrusion 17 are provided on the distal end side of the large-diameter portion 41. It is prepared side by side. The large diameter portion 41 of the joint 40 before processing is the same diameter as the outer diameter of the annular ridge portion 20 when viewed from the axial direction of the core portion 15 in the resin pipe joint 10 or larger than the outer diameter of the annular ridge portion 20. It has become.

  When the pre-processing joint 40 is prepared, as shown in FIG. 6B, the pre-processing joint 40 is rotated about the first shaft 31J eccentric to the other side in the radial direction with respect to the central axis J1 of the core portion 15. Then, the cutting edge 42 is applied to the large diameter portion 41 from the outside in the radial direction to cut the outer peripheral portion of the large diameter portion 41. At this time, on the proximal end side with respect to the position closer to the distal end of the core portion 15, the distal end side with respect to the position closer to the distal end is set such that the distance from the first shaft 31J becomes shorter toward the proximal end side of the core portion 15. Then, by controlling the position of the cutting blade 42 so that the distance from the first shaft 31J becomes shorter toward the distal end side, the distal end of the cutting blade 42 is contracted on the proximal end side around the first shaft 31J. It arrange | positions so that the 1st conical surface 31 diameterd and the 1st front-end | tip conical surface 33 diameter-reduced by the front end side may be drawn. And the 1st inclined curved surface 21 which is a part of 1st cone surface 31 is formed in the part which faces the radial direction one side among the outer peripheral surfaces of the core part 15 (refer FIG. 6 (A)). In the example of the present embodiment, the amount of eccentricity ΔX1 of the first shaft 31J with respect to the central axis J1 of the core portion 15 is the length of the first inclined curved surface 21 in the axial direction of the core portion 15 and the first conical surface 31 has. Although it is substantially the same as the diameter reduction amount ΔR1 to reduce the diameter, if the amount of eccentricity ΔX1 is more than half of the diameter reduction amount ΔR1, only the portion of the outer peripheral surface of the large diameter portion 41 that faces one side in the radial direction One inclined curved surface 21 can be formed.

  Next, as shown in FIG. 7 (B), the large-diameter portion 41 is rotated while rotating the joint 40 before processing around the second shaft 32J that is eccentric to one side in the radial direction with respect to the central axis J1 of the core portion 15. The outer peripheral part of the large diameter part 41 (refer FIG. 6 (B)) is cut by applying the cutting blade 42 to the outer side in the radial direction. At this time, by controlling the position of the cutting blade 42 so that the distance from the second shaft 32J becomes shorter toward the distal end side of the core portion 15, the distal end of the cutting blade 42 is centered on the second shaft 32J. It arrange | positions so that the 2nd conical surface 32 diameter-reduced by the side may be drawn. And the 2nd inclined curved surface 22 which is a part of 2nd conical surface 32 is formed in the part which faces the radial direction other side among the outer peripheral surfaces of the core part 15, and the 1st inclined curved surface 21 and the 2nd inclined curved surface 22 are formed. An annular ridge 20 is formed as a boundary line (see FIG. 7A). Thus, the resin pipe joint 10 shown in FIGS. 1 to 3 is completed. In the example of the present embodiment, the amount of eccentricity ΔX2 of the second shaft 32J with respect to the central axis J1 of the core portion 15 is the length of the second inclined curved surface 22 in the axial direction of the core portion 15 and the second conical surface 32 has. The diameter is substantially the same as the diameter reduction amount ΔR2, but if the eccentricity amount ΔX2 is more than half of the diameter reduction amount ΔR2, only the portion of the outer peripheral surface of the large diameter portion 41 facing the other side in the radial direction is used. Two inclined curved surfaces 22 can be formed.

  The description regarding the manufacturing method of the joint 10 for resin pipes is above. Next, the effect of the resin pipe joint 10 will be described.

  In the resin pipe joint 10 of the present embodiment, the annular ridge 20 formed on the outer peripheral surface of the core 15 inserted inside the resin pipe 50 is disposed obliquely with respect to the central axis J1 of the core 15. It is formed in an elliptical shape. Therefore, when the core portion 15 is inserted into the resin tube 50, the portion where the resin tube 50 is expanded outward by the annular ridge portion 20 is dispersed in the axial direction of the resin tube 50. Thereby, the resin tube 50 is easily deformed, and the core portion 15 can be easily inserted into the resin tube 50.

  Further, in the resin pipe joint 10, a portion of the outer peripheral surface of the core portion 15 that is disposed on the distal end side with respect to the annular ridge portion 20 has a second conical surface 32 that decreases in diameter toward the distal end side of the core portion 15. Since the second inclined curved surface 22 is provided, the second inclined curved surface 22 causes the resin tube 50 when the core portion 15 is inserted into the resin tube 50 and the resin tube 50 gets over the annular ridge portion 20. Can be gradually expanded outward, and the core portion 15 can be easily inserted into the resin tube 50.

  Further, in the resin pipe joint 10 of the present embodiment, the annular ridge portion 20 has an elliptical shape toward the one side in the radial direction of the core portion 15 toward the distal end side of the core portion 15. Of the surface, the portions disposed on the proximal end side and the distal end side with respect to the annular ridge portion 20 are reduced in diameter toward the distal end side and a part of the first conical surface 31 that decreases in diameter toward the proximal end side. Since it comprises a part of the second conical surface 32, the resin pipe joint 10 can be manufactured by cutting as described with reference to FIGS.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 8, the resin pipe joint 10V of the present embodiment is a modification of the first embodiment, and only the configuration of the core portion 15 is different from the first embodiment. As shown in the figure, also in the resin pipe joint 10V of the present embodiment, the core 15 is inserted from the inside of the resin pipe 50, and the resin pipe 50 is tightened by the clip 51 from the outside. The space between the portion 15 and the inner surface of the resin tube 50 is sealed.

  As shown in FIGS. 9A and 9B, in the resin pipe joint 10V of the present embodiment as well, the annular ridge portion 20V formed on the outer peripheral surface of the core portion 15 is the same as in the first embodiment. Is disposed along the inclined surface K1 inclined obliquely with respect to the central axis J1 of the core portion 15, and toward the one side in the radial direction of the core portion 15 toward the tip side of the core portion 15, the inclined surface K1. It is formed in an elliptical shape when viewed from the direction perpendicular to the direction. Further, in the present embodiment, the annular ridge portion 20 </ b> V is formed in a strip shape having a substantially constant width in the axial direction of the core portion 15. In the following description, the direction in which the annular ridge portion 20V is inclined with respect to the central axis J1 in the radial direction of the core portion 15 is defined as the first radial direction X and the minor axis direction of the annular ridge portion 20V (that is, the core portion 15 Of the radial directions, the direction perpendicular to the first radial direction X) will be referred to as the second radial direction Y.

  As shown in FIGS. 9A and 10A, the first end edge 20VA facing the one side in the first radial direction X of the annular ridge portion 20V is composed of the first distal end side curved portion 25 and the first proximal end. The side curve portion 26 is formed. Specifically, a portion of the outer peripheral surface of the core portion 15 that is disposed on one side in the first radial direction X with respect to the annular ridge portion 20V has a first distal-side conical surface that decreases in diameter toward the proximal end side. A pair of first proximal-side inclined curved surfaces 36A, which are a part of a first distal-side inclined curved surface 35A that is a part of 35 and a first proximal-side conical surface 36 that is also reduced in diameter toward the proximal side. 36A (refer to FIG. 17; only one first base-side inclined curved surface 36A is shown in FIGS. 9A and 10A). The first distal-side inclined curved surface 35A is disposed closer to the distal end side of the core portion 15 than the pair of first proximal-side inclined curved surfaces 36A, 36A. Then, the first tip that is the edge of the first tip-side inclined curved surface 35A on the annular ridge portion 20V side by the intersecting line between the first tip-side conical surface 35 and the first plane H1 substantially parallel to the inclined surface K1 described above. A side curved portion 25 is formed, and a first base end that is an edge of the first base end side inclined curved surface 36A on the annular ridge portion 20V side by a line of intersection between the first base end side conical surface 36 and the first plane H1. A side curve portion 26 is formed. The first proximal side curved portion 26 is disposed on an extension line of the first distal side curved portion 25, and the first distal side curved portion 25 and the first proximal side curved portion 26 are connected. And the 1st end which faces one side of the 1st diameter direction X among annular ridges 20V by the 1st tip side curve part 25 and a pair of 1st base end side curve parts 26 and 26 which were connected. An edge 20VA is formed. The first plane H1 is inclined so that the distal end side of the core portion 15 is disposed on one side in the first radial direction X.

  Further, as shown in FIGS. 9A and 10B, the second end edge 20VB facing the other side in the first radial direction X of the annular ridge portion 20V has the second base end side curved portion 27 and the second ridge portion 20VB. It is formed with 2 front end side curved portions 28. Specifically, a portion of the outer peripheral surface of the core portion 15 that is disposed on the other side in the first radial direction X with respect to the annular ridge portion 20V has a second proximal-side conical surface that decreases in diameter toward the distal end side. A pair of second distal-side inclined curved surfaces 38A, 38A (part of a second proximal-side inclined curved surface 37A, which is a part of 37, and a second distal-side conical surface 38 that is also reduced in diameter toward the distal end side). 17A, only one second tip side inclined curved surface 38A is shown in FIGS. 9A and 10B. The second base-side inclined curved surface 37A is disposed closer to the base end side of the core portion 15 than the pair of second tip-side inclined curved surfaces 38A, 38A. The second base end-side conical surface 37 and the second plane H2 that is substantially parallel to the inclined surface K1 described above are the edges of the second base end-side inclined curved surface 37A on the annular ridge 20V side. A second distal end curved portion 27 is formed, and a second distal end that is an edge of the second distal inclined side curved surface 38A on the annular ridge 20V side by an intersection line between the second distal conical surface 38 and the second plane H2. A side curve portion 28 is formed. The second distal-side curved portion 28 is disposed on an extension line of the second proximal-side curved portion 27, and the second proximal-side curved portion 27 and the second distal-side curved portion 28 are connected. And the 2nd end which faces the other side of the 1st diameter direction X among annular ridges 20V by the 2nd base end side curve part 27 and a pair of 2nd tip side curve parts 28 and 28 which continued. An edge 20VB is formed. The second plane H2 is substantially parallel to the first plane H1, and is disposed on the distal end side of the core portion 15 with respect to the first plane H1.

  This completes the description of the structure of the resin pipe joint 10V. Next, the manufacturing method of the joint 10V for resin pipes is demonstrated.

  In order to manufacture the resin pipe joint 10V, first, as shown in FIGS. 11A and 11B, a pre-process joint 40V that is different from the resin pipe joint 10V only in the structure of the core portion 15 is prepared. Specifically, in the joint 40V before processing, the core portion 15 has a large-diameter portion 41 at an intermediate portion in the axial direction, and the annular groove 16 and the distal-end protrusion 17 are provided on the distal end side of the large-diameter portion 41. It is prepared side by side. The large diameter portion 41 of the joint 40V before processing is the same diameter as the outer diameter of the annular ridge portion 20V when viewed from the axial direction of the core portion 15 in the resin pipe joint 10V, or larger than the outer diameter of the annular ridge portion 20V. It has become.

  When the joint 40V before processing is prepared, as shown in FIG. 12B, the joint before processing is centered on the first shaft 35J eccentric to the other side in the first radial direction X with respect to the center axis J1 of the core portion 15. While rotating 40V, the cutting edge 42 is applied to the large diameter portion 41 from the outside in the radial direction to cut the outer peripheral portion of the large diameter portion 41. At this time, in the portion on the distal end side from the first intermediate position L1 located in the middle in the axial direction in the large diameter portion 41, the cutting blade is set so that the distance from the first shaft 35J becomes shorter toward the proximal end side. By controlling the position of 42, the tip of the cutting blade 42 is arranged so as to draw a first tip side conical surface 35 whose diameter is reduced on the base end side with the first shaft 35J as the center. Further, in the portion on the base end side from the first intermediate position L1, the distance from the first shaft 35J of the cutting blade 42 is the same as the distance from the first shaft 35J of the cutting blade 42 at the first intermediate position L1. Thus, the position of the cutting blade 42 is controlled. A first tip-side inclined curved surface 35A, which is a part of the first tip-side conical surface 35, is formed on a portion of the outer peripheral surface of the large-diameter portion 41 facing one side in the first radial direction X (FIG. 12). (See (A)). Here, in the example of the present embodiment, the eccentric amount ΔX1 of the first shaft 35J with respect to the central axis J1 of the core portion 15 is substantially the same as the diameter reduction amount ΔR1 of the first tip side inclined curved surface 35A. If the amount ΔX1 is equal to or greater than half of the diameter reduction amount ΔR1, the first tip side inclined curved surface 35A can be formed only on one side in the first radial direction X of the outer peripheral surface of the large diameter portion 41. 18A and 18B show a cross section of the large-diameter portion 41 before and after the formation of the first tip side inclined curved surface 35A.

  Next, as shown in FIG. 13 (B), while rotating the pre-working joint 40V around the second shaft 37J that is eccentric to one side of the first radial direction X with respect to the central axis J1 of the core portion 15, A cutting blade 42 is applied to the diameter portion 41 from outside in the radial direction to cut the outer peripheral portion of the large diameter portion 41 (see FIG. 6B). At this time, in the portion on the base end side with respect to the first intermediate position L1 in the large diameter portion 41 with respect to the first intermediate position L1, the distance from the second shaft 37J becomes shorter toward the front end side. By controlling the position of the cutting blade 42 as described above, the distal end of the cutting blade 42 is disposed so as to draw the second proximal end-side conical surface 37 with the second axis 37J as the center. Further, in the portion on the tip side from the second intermediate position L2, the distance from the second shaft 37J of the cutting blade 42 is the same as the distance from the second shaft 37J of the cutting blade 42 at the second intermediate position L2. Thus, the position of the cutting blade 42 is controlled. Then, a second base-side inclined curved surface 37 </ b> A that is a part of the second base-side conical surface 37 is formed on a portion of the outer peripheral surface of the large-diameter portion 41 facing the other side in the first radial direction X ( (See FIG. 13A). The second base-side inclined curved surface 37A and the first distal-side inclined curved surface 35A described above overlap between the first intermediate position L1 and the second intermediate position L2 in the axial direction of the large diameter portion 41. Here, in the example of the present embodiment, the amount of eccentricity ΔX2 of the second shaft 37J with respect to the central axis J1 of the core portion 15 is substantially the same as the diameter reduction amount ΔR2 of the second base-side inclined curved surface 37A. If the amount of eccentricity ΔX2 is greater than or equal to half of the diameter reduction amount ΔR2, the second base-side inclined curved surface 37A can be formed only on the other side in the first radial direction X of the outer peripheral surface of the large diameter portion 41. .

  Next, as shown in FIG. 14B, the large-diameter portion is rotated while rotating the pre-working joint 40V about the second intermediate shaft 38J that is eccentric to the central shaft J1 side of the core portion 15 with respect to the second shaft 37J. The outer peripheral part of the large diameter part 41 is cut by applying the cutting blade 42 to 41 from the outer side in the radial direction. At this time, by controlling the position of the cutting blade 42 so that the distance from the second intermediate shaft 38J becomes shorter toward the distal end side in the portion on the distal end side than the second intermediate position L2 in the large diameter portion 41, The tip of the cutting blade 42 is disposed so as to draw a second tip side conical surface 38 centered on the second intermediate shaft 38J. Then, a pair of second tip-side inclined curved surfaces 38A and 38A formed by a part of the second tip-side conical surface 38 are formed in a portion of the outer peripheral surface of the core portion 15 facing in the second radial direction Y. (See FIGS. 15A and 15B).

  Here, as shown in FIGS. 14A and 15A, the pair of second distal-side inclined curved surfaces 38A, 38A are formed in the circumferential direction of the core portion 15 into the second proximal-side inclined curved surface 37A. It arrange | positions so that it may slip | deviate with respect to. Further, the edge on one side in the first radial direction X of the second base-side inclined curved surface 37 </ b> A and the pair of second distal-side inclined curved surfaces 38 </ b> A and 38 </ b> A are both oblique with respect to the central axis J <b> 1 of the core portion 15. 2nd base end side curved surface 27 that is an intersection line of the second base end side inclined curved surface 37A and the second plane H2, the second front end side inclined curved surface 38A and the second The second tip side curved portion 28 that is a line of intersection with the two planes H2 is connected.

  Next, as shown in FIG. 16B, the large-diameter portion is rotated while rotating the joint 40V before processing around the first intermediate shaft 36J that is eccentric to the central shaft J1 side of the core portion 15 with respect to the first shaft 35J. The outer peripheral part of the large diameter part 41 is cut by applying the cutting blade 42 to 41 from the outer side in the radial direction. At this time, the position of the cutting blade 42 is controlled so that the distance from the first intermediate shaft 36J becomes shorter toward the base end side in the portion on the base end side from the first intermediate position L1 in the large diameter portion 41. Thus, the distal end of the cutting blade 42 is disposed so as to draw the first proximal-side conical surface 36 centered on the first intermediate shaft 36J. A pair of first base-side inclined curved surfaces 36 </ b> A and 36 </ b> A configured by a part of the first base-side conical surface 36 is formed on a portion of the outer peripheral surface of the core portion 15 facing in the second radial direction Y. It is formed (see FIGS. 17A and 17B). 19A and 19B show cross sections of the large-diameter portion 41 before and after the formation of the pair of first base-side inclined curved surfaces 36A and 36A.

  Here, as shown in FIGS. 16A and 17A, the pair of first proximal-side inclined curved surfaces 36A and 36A is formed in the circumferential direction of the core portion 15 with the first distal-end inclined curved surface 35A. It arrange | positions so that it may slip | deviate with respect to. In addition, the first distal-side inclined curved surface 35 </ b> A and the pair of first proximal-side inclined curved surfaces 36 </ b> A and 36 </ b> A are both inclined with respect to the central axis J <b> 1 of the core portion 15. Are arranged on a first plane H1 that intersects the first front-side inclined curved surface 35A and the first plane H1, and the first distal-side curved surface 25 and the first proximal-side inclined curved surface 36A and the first The first base end side curved portion 26 that is a line of intersection with the plane H1 is connected. And among the outer peripheral parts of the core part 15, the 1st front end side curve part 25 and a pair of 1st base end side curve parts 26 and 26, the 2nd base end side curve part 27, and a pair of 2nd front end side An annular ridge 20V is formed in a portion sandwiched between the curved portions 28, 28. Thus, the resin pipe joint 10V shown in FIGS. 8 to 10 is completed.

  This completes the description of the method for manufacturing the resin pipe joint 10V. Next, the effect of the resin pipe joint 10V will be described.

  In the resin pipe joint 10 </ b> V of the present embodiment, the annular ridge 20 </ b> V formed on the outer peripheral surface of the core 15 inserted inside the resin pipe 50 is disposed obliquely with respect to the central axis J <b> 1 of the core 15. Since it is formed in an elliptical shape, the core portion 15 can be easily inserted into the resin tube 50 as in the first embodiment.

  Further, in the resin pipe joint 10 </ b> V, a portion of the outer peripheral surface of the core portion 15 that is disposed on the distal end side with respect to the annular ridge portion 20 </ b> V has a second distal-end-side cone that decreases in diameter toward the distal end side of the core portion 15. Since the second distal end-side inclined curved surface 38A that is a part of the surface 38 and the second proximal-side inclined curved surface 37A that is a part of the second proximal-side conical surface 37 are provided, When 15 is inserted and the resin tube 50 gets over the annular ridge 20V, the resin tube 50 can be gradually expanded outward by the second distal-end side inclined curved surface 38A and the second proximal-side inclined curved surface 37A. Insertion of the core portion 15 into the resin tube 50 is facilitated. In addition, since the annular ridge portion 20V has a strip shape having a substantially constant width in the axial direction of the core portion 15, the seal with the resin pipe 50 can be stabilized.

  Furthermore, in the resin pipe joint 10V of the present embodiment, the first end side conical surface 35 and the core portion 15 in which the first end edge 20VA facing the base end side of the annular ridge portion 20V is reduced in diameter toward the base end side. A first distal-side curved portion 25 that is a part of a line of intersection with the first plane H1 intersecting the central axis J1, a first proximal-side conical surface 36 that decreases in diameter toward the proximal side, and a first plane. A pair of first base-side curved portions 26 and 26 that are a part of the line of intersection with H1 are formed in a continuous manner. The second end edge 20VB facing the distal end side of the annular ridge portion 20V is formed by a second proximal end conical surface 37 that is reduced in diameter toward the distal end side and a second plane H2 that intersects the central axis J1 of the core portion 15. The second base end side curved portion 27 constituted by a part of the intersection line, and the part of the intersection line between the second distal end side conical surface 38 and the second plane H2 whose diameter decreases toward the distal end side. The pair of second tip side curved portions 28, 28 are formed in a continuous manner. According to such a configuration of the resin pipe joint 10V, as described with reference to FIGS. 11 to 19, the resin pipe joint 10V can be manufactured by cutting.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various modifications are possible within the scope of the invention other than the following. It can be changed and implemented.

  (1) In the above-described embodiment, the resin pipe joints 10 and 10V are separate from the fastening tool (clip 51) for fastening the resin pipe 50. However, like the quick joint, the joint is provided integrally with the fastening tool. There may be.

  (2) In the method for manufacturing the resin pipe joint 10, 10V shown in the above embodiment, the annular groove 16 and the tip protrusion 17 are formed before the formation of the annular ridges 20, 20V. It may be formed after the formation of 20, 20V.

  (3) In the above embodiment, the lengths of the annular ridges 20 and 20V in the axial direction of the core portion 15 are slightly shorter than the axial length of the portion where the resin pipe 50 is fastened by the clip 51 ( 1 and FIG. 8), it is sufficient if it is less than the axial length of the portion to be tightened, and it may be the same length as the axial length or half or less.

  (4) In the said embodiment, although the joint 10 for resin pipes and 10V were shown by the example manufactured by cutting, it may be manufactured by casting.

  (5) In the above embodiment, the resin pipe joints 10 and 10V have a straight shape, but may have an L shape as shown in FIG. 20 (A) or as shown in FIG. 20 (B). Alternatively, it may be T-shaped. FIG. 20A shows an example in which the core portions 15 are formed at both ends of the L-shape, and the annular ridges 20V are formed in each core portion 15. Any of the part 20 and the annular ridge part 20V should just be formed. Moreover, in the example of the same figure, the core part 15 may be formed only in the L-shaped one end part, and the annular ridge part 20 or the annular ridge part 20V may be formed in the core part 15. FIG. 20B shows an example in which the core portion 15 is formed in all three branch pipe portions in the T-shape, and the annular ridge portion 20V is formed in each core portion 15. Any one of the annular ridge portion 20 and the annular ridge portion 20V may be formed in the portion 15. Moreover, in the example of the figure, the core part 15 is formed in any one or two branch pipe parts among three branch pipe parts, and the annular ridge part 20 or the annular ridge part 20V is formed in the core part 15. May be.

10, 10V Resin pipe joint 15 Core portion 20, 20V Annular peak 21 First inclined curved surface 22 Second inclined curved surface 25 First distal end side curved portion 26 First proximal end side curved portion 27 Second proximal end side curved portion 28 28 2 tip side curved portion 31 first conical surface 31J first axis 32 second conical surface 32J second axis 35 first tip side conical surface 36 first base end side conical surface 37 second base end side conical surface 38 second tip Side conical surface 50 Resin pipe H1 First plane H2 Second plane

Claims (4)

An annular ridge having a cylindrical core portion inserted inside the resin tube and having a portion farthest from the central axis of the core portion closed in the circumferential direction is formed on the outer peripheral surface of the core portion. A joint for resin pipes,
The annular ridge portion is disposed along an inclined surface inclined obliquely with respect to the axial direction of the core portion, and toward the one end side in the radial direction of the core portion as it goes toward the tip side of the core portion, and , Formed in an elliptical shape when viewed from a direction perpendicular to the inclined surface,
The portion of the outer peripheral surface of the core portion that is disposed on the proximal end side of the core portion with respect to the annular ridge portion has a first axis that is eccentric to the other side in the radial direction with respect to the central axis of the core portion. Consists of a part of the conical surface of the first cone that decreases in diameter toward the base end side of the core portion as the center,
The portion of the outer peripheral surface of the core portion that is disposed on the distal end side of the core portion with respect to the annular ridge portion is centered on a second axis that is eccentric to one side in the radial direction with respect to the central axis of the core portion. The joint for resin pipes comprised by a part of conical surface of the 2nd cone which diameter-reduces toward the front end side of the said core part. It has a cylindrical core portion that is inserted inside the resin tube, and an annular ridge portion is provided on the outer peripheral surface of the core portion so that a portion farthest from the central axis of the core portion is closed in the circumferential direction. A joint for resin pipes,
The annular ridge portion is disposed along an inclined surface that is inclined obliquely with respect to the central axis of the core portion, and toward the one end side in the radial direction of the core portion toward the tip end side of the core portion, and The belt is formed in an elliptical shape when viewed from a direction perpendicular to the inclined surface, and has a band shape having a width in the axial direction of the core portion,
The first edge that faces the base end side of the core portion of the annular ridge portion,
A conical surface of a first tip-side cone that decreases in diameter toward a proximal end side of the core portion about a first axis that is eccentric to the other side in the radial direction with respect to the central axis of the core portion; and the inclined surface; A first tip-side curved portion that is a part of a line of intersection with the substantially parallel first plane;
A conical surface of a first proximal-side cone that decreases in diameter toward a proximal end side of the core portion about a first intermediate shaft that is eccentric to the central axis side of the core portion with respect to the first shaft; The first base-side curved portion that is a part of the line of intersection with one plane is formed in a continuous manner,
The second edge facing the tip side of the core portion of the annular ridge portion is,
A conical surface of a second proximal-side cone that decreases in diameter toward the distal end side of the core portion about a second axis that is eccentric to one side in the radial direction with respect to the central axis of the core portion; and the inclined surface; A second base-side curved portion configured by a part of a line of intersection with a second plane that is substantially parallel and located on the distal end side of the core portion with respect to the first plane;
A conical surface of a second tip-side cone that decreases in diameter toward the tip side of the core portion about a second intermediate shaft that is eccentric to the center axis side of the core portion with respect to the second axis; and the second plane The joint for resin pipes formed by connecting the 2nd tip side curvilinear part constituted by a part of line of intersection of these. A method for manufacturing a joint for a resin pipe, wherein an annular ridge formed by closing a portion farthest from the central axis of the core portion in the circumferential direction is formed on an outer peripheral surface of a cylindrical core portion inserted inside the resin tube Because
Forming a large-diameter portion having the same diameter as the annular ridge portion or a larger diameter than the annular ridge portion in the core portion;
The outer peripheral portion of the large-diameter portion is cut, has a long axis that obliquely intersects the central axis of the core portion, and has an elliptical shape that goes to one side in the radial direction toward the tip side of the core portion. Forming the annular ridge,
To cut the outer periphery of the large diameter portion,
The cutting blade is moved in the axial direction of the core portion while rotating the core portion around a first axis that is eccentric to the other side in the radial direction with respect to the central axis of the core portion. The distance from one axis is shortened from the distal end side to the proximal end side of the core portion, and is reduced toward the proximal end side of the core portion to a portion of the large diameter portion that faces one side in the radial direction. Forming a first inclined curved surface that is part of the conical surface of the first conical diameter;
The cutting blade is moved in the axial direction of the core portion while rotating the core portion around a second axis that is eccentric to one side in the radial direction with respect to the central axis of the core portion, and the cutting blade The distance from the second axis is shortened from the proximal end side to the distal end side of the core portion, and is reduced toward the distal end side of the core portion to a portion facing the other radial side of the large diameter portion. Forming a second inclined curved surface that is part of a conical surface of a second conical diameter,
A method for manufacturing a joint for resin pipes, wherein the annular ridge portion is formed as a boundary line between the first inclined curved surface and the second inclined curved surface. A method for manufacturing a joint for a resin pipe, wherein an annular ridge formed by closing a portion farthest from the central axis of the core portion in the circumferential direction is formed on an outer peripheral surface of a cylindrical core portion inserted inside the resin tube Because
Forming a large-diameter portion having the same diameter as the annular ridge portion or a larger diameter than the annular ridge portion in the core portion;
The outer peripheral portion of the large-diameter portion is cut, has a long axis that obliquely intersects the central axis of the core portion, and is orthogonal to the central axis of the core portion as it goes toward the tip side of the core portion. Forming the elliptical annular peak toward one side in one radial direction,
To cut the outer periphery of the large diameter portion,
The cutting blade is moved in the axial direction of the core part while rotating the core part around the first axis that is eccentric to the other side of the first radial direction with respect to the central axis of the core part, and the large diameter The distance from the first axis of the cutting blade to the proximal end side of the core portion is shortened toward the proximal end side of the core portion on the distal end side from the first intermediate position located in the middle in the axial direction of the portion, and A first tip-side inclined curved surface that is a part of the conical surface of the first tip-side cone that decreases in diameter toward the base end side of the core portion is formed in a portion facing one side in the first radial direction. When,
The cutting blade is moved in the axial direction of the core portion while rotating the core portion around a second axis eccentric to one side of the first radial direction with respect to the central axis of the core portion, and the large The distance from the second axis of the cutting blade toward the distal end side of the core portion is shortened on the proximal end side from the second intermediate position located on the distal end side with respect to the first intermediate position in the diameter portion. And a second base that is a part of a conical surface of a second base-end-side cone that decreases in diameter toward the distal end side of the core portion at a portion facing the other side in the first radial direction of the large-diameter portion. Forming an end-side inclined curved surface;
The cutting blade is moved in the axial direction of the core portion while rotating the core portion around a first intermediate shaft that is eccentric to the central axis side of the core portion relative to the first shaft, and the large-diameter portion Of these, the distance from the first intermediate shaft of the cutting blade to the base end side of the first intermediate position is shortened toward the base end side of the core portion, and the center of the core portion of the large diameter portion is shortened. Consists of a part of a conical surface of a first base-end-side cone whose diameter decreases toward the base end side of the core portion in a portion facing the second radial direction orthogonal to both the shaft and the first radial direction And a pair of first base-side inclined curved surfaces in which an edge facing the other side in the first radial direction is connected to an edge facing the other side in the first radial direction in the first distal-side inclined curved surface. Forming,
The cutting blade is moved in the axial direction of the core portion while rotating the core portion around a second intermediate shaft that is eccentric to the center axis side of the core portion relative to the second shaft, and the large diameter portion Of these, on the tip side from the second intermediate position, the distance from the second intermediate shaft of the cutting blade is shortened toward the tip side of the core portion, and opposed in the second radial direction of the large diameter portion. And a portion of the conical surface of the second tip-side cone that decreases in diameter toward the tip side of the core portion, and an edge that faces one side in the first radial direction is the second base. Forming a pair of second tip-side inclined curved surfaces connected to an edge facing one side of the first radial direction in the end-side inclined curved surface;
In the large-diameter portion, the annular ridge portion has an edge facing the other side of the first radial direction in the pair of first base-side inclined curved surface and the first tip-side inclined curved surface, and the pair The manufacturing method of the joint for resin pipes formed in the part pinched by the edge which faces the one side of the said 1st radial direction in the 2nd front end side inclined curved surface and the said 2nd base end side inclined curved surface.