JP2007239973A - Joining structure of tube material, joining method of tube material, and tube end cutting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining structure of a tube material capable of joining the tube material by heating and welding without generating a void in a weld part or the swelling or recess of beads on the inside of the weld part. <P>SOLUTION: In the joining structure of the tube material 2 by inserting a tube end 20 to a thermoplastic resin joint 1 having an end surface composed of a plurality of faces 11, 12 and 13 on the inside of a tube end 10 and mutually joining the tube ends 10 and 20 by heating and welding, the end surface of the thermoplastic resin tube material 2 includes a plurality of cut faces 22 and 23 which form clearances 30a and 30b extending toward inner wall surfaces 10b and 20b with a plurality of faces 12 and 13 when the tube is inserted to the joint 1, and the plurality of cut faces 22 and 23 and the end surface of the joint 1 extend the respective contact faces by expansion during heating while removing the clearances 30a and 30b so as to push out and release air. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to the joining of thermoplastic resin tube materials in which a pipe end is inserted into a thermoplastic resin joint having an end face composed of a plurality of faces inside the pipe end, and the pipe ends are joined together by heat welding. The present invention relates to a structure, a tube material joining method, and a tube end cutting method.

  Conventionally, there has been a welding method such as plug welding or butt welding as a method of joining tube materials such as resin joints and tubes by heat welding. According to these welding methods, so-called beads are generated on both the inner and outer wall surfaces at the welded portion where the tube ends of the tube material are welded together. When welding is performed by bringing a heating member into contact with the outer wall surface of the tubular member, the bead bulge is suppressed by the heating member in contact with the outer wall surface on the outer wall surface side of the welding portion. Since there is nothing on the side surface, a bead is generated.

  In this case, the bead is generated when the temperature of the inner wall of the tube material rises at the time of welding and the temperature of the air remaining inside the tube material rises. This is because the expanded resin expands to the inside of the welded portion. When this bead exists inside the tube material, there arises a problem that the fluid flowing through the tube material stays. Moreover, the problem that pressure loss increases arises.

  As a method for preventing the occurrence of such a bead, a core body in contact with the inner wall is inserted inside the welded part during welding (Patent Document 1), or a bladder as an inner peripheral support device is inserted. (Patent Document 2), there is one that suppresses the bulging of the bead from the inner wall surface of the welded portion. Also, the end of the pipe is cut so as to give an angle to the welded pipe end face, or the pipe end face is formed in advance so as to have a predetermined angle when the tube material is formed to prevent bead bulging. There was a method to do (Patent Document 3).

JP-A-5-104632 Japanese Patent Laid-Open No. 1-110127 JP-A-2-266191

  However, in the method of inserting a core body or a bladder inside the welded portion, the core body or the like cannot often be inserted when piping construction is complicated. Further, in the case of a method in which an angle is given to the end face of the tube, there is a problem that a groove may be generated even if the generation of a bead at the welded portion can be prevented. Furthermore, there is a problem that voids may occur in the welded portion.

  The present invention has been made paying attention to such problems of the prior art, and does not generate voids in the welded part and heats up without generating bead bulge or dent inside the welded part. It aims at providing the joining structure of the tube material which can be welded and joined, the joining method of a tube material, and the pipe end part cutting method.

The gist of the present invention for achieving the object lies in the inventions of the following items.
[1] The pipe end (20) is inserted into the thermoplastic resin joint (1) having an end face composed of a plurality of faces (11, 12, 13) inside the pipe end (10), and the pipe end ( 10, 20) In the joining structure of the tube material (2) of the thermoplastic resin that is welded and joined together,
The end surface of the tube material (2) is a gap that expands toward the inner wall surface (10b, 20b) with the plurality of surfaces (12, 13) of the joint (1) when inserted into the joint (1). Consisting of a plurality of cut surfaces (22, 23) forming (30),
The plurality of cut surfaces (22, 23) and the end surface of the joint (1) escape from the gap (30) while extruding air while expanding the contact surfaces by expansion during heating. A joining structure of the tube material (2).

[2] The pipe end (20) is inserted into the thermoplastic resin joint (1) having an end face composed of a plurality of faces (11, 12, 13) inside the pipe end (10), and the pipe end ( 10, 20) In the joining structure of the tube material (2) of the thermoplastic resin that is welded and joined together,
The plurality of surfaces (11, 12, 13) of the joint (1) include a tube material guide surface (11) in contact with an outer wall surface (20a) of the tube material (2) to be inserted into the tube end (10), An outwardly facing surface (12) from the end (11a) of the tube material guide surface (11) to the center and toward the tube end outlet, and a distal end (12a) of the outwardly facing surface (12) to the center and inward of the tube end. And an inward surface (13) leading to the inner wall surface (10b),
The tube end (20) of the tube material (2) includes an outer surface (22) from the outer wall surface (20a) toward the inner wall surface (20b) and toward the inner depth, and an end of the outer surface (22). An end face composed of an inner surface (23) extending from (22a) to the inner wall surface (20b),
The outer surface (22) and the inner surface (23) are inserted into the joint (1) for heat welding, and the distal end (22b) of the outer surface (22) is connected to the joint (1). In the state which reached the terminal end (11a) of the tube material guide surface (11), it expands toward the inner wall surface (10b, 20b) between the outward surface (12) and the inward surface (13) of the joint (1). A gap (30a, 30b) is formed, and the gap (30a, 30b) is expanded while expanding the contact surface with the end face of the joint (1) from the tip (22b) of the outer surface (22) by expansion during heating. The joining structure of the tube material (2), characterized in that it escapes so as to push air out.

[3] A gap between the plurality of surfaces (12, 13) and the thermoplastic resin joint (1) having an end surface composed of a plurality of surfaces (11, 12, 13) inside the pipe end (10). A tube material (2) joining method in which a thermoplastic resin tube material (2) having a plurality of cut surfaces (22, 23) forming (30) at a pipe end (20) is heat-welded and joined. And
The tube end (20) of the tube material (2) is inserted inside the tube end (10) of the joint (1), and the plurality of surfaces (12, 13) of the joint (1) and the tube material are inserted. An insertion step of forming the gap (30) extending toward the inner wall surface (10b, 20b) between the plurality of cut surfaces (22, 23) of (2);
A heating step of heating from the outer wall surface (10a) side of the tube end portion (10) to the melting temperature at least around the tube end portion (10);
The gap (30) is eliminated while expanding the contact surface between the plurality of surfaces (12, 13) of the joint (1) and the plurality of cut surfaces (22.23) of the tube material (2) by expansion during heating. And a heating maintaining step of maintaining heating until the air is escaped and welded, so as to extrude air.

[4] The pipe end (20) is inserted into the thermoplastic resin joint (1) having an end face composed of a plurality of faces (11, 12, 13) inside the pipe end (10), and the pipe end ( 10, 20) A tube end cutting method for cutting a thermoplastic resin tube material (2) to be welded to each other by heating and welding into a shape for welding joining,
When the tube material (2) is cut and inserted into the joint (1), the tube material (2) expands toward the inner wall surface (10b, 20b) between the plurality of faces (12, 13) of the joint (1). Having a cutting step of forming an end face composed of a plurality of cut faces (22, 23) forming a gap (30);
The plurality of cut surfaces (22, 23) extrude air by eliminating the gap (30) while expanding the contact surfaces with the plurality of surfaces (12, 13) of the joint (1) by expansion during heating. A tube end cutting method characterized in that it escapes as described above.

[5] The pipe end (20) is inserted into the thermoplastic resin joint (1) having an end face composed of a plurality of faces (11, 12, 13) inside the pipe end (10), and the pipe end ( 10, 20) A tube end cutting method for cutting a thermoplastic resin tube material (2) to be welded to each other by heating and welding into a shape for welding joining,
The plurality of surfaces (11, 12, 13) of the joint (1) include a tube material guide surface (11) in contact with an outer wall surface (20a) of the tube material (2) to be inserted into the tube end (10), An outwardly facing surface (12) from the end (11a) of the tube material guide surface (11) to the center and toward the tube end outlet, and a distal end (12a) of the outwardly facing surface (12) to the center and inward of the tube end. And an inward surface (13) leading to the inner wall surface (10b),
The tube material (2) is cut, and the tube material (2) is moved from the outer wall surface (20a) of the tube end (20) toward the inner wall surface (20b) and toward the inner depth of the tube material (2). A cutting step of forming an end surface composed of a side surface (22) and an inner side surface (23) extending from the terminal end (22a) of the outer side surface (22) to the inner wall surface (20b);
The outer surface (22) and the inner surface (23) of the cut tube material (2) are formed by inserting the tube material (2) into the joint (1) for heat welding. In a state where the tip (22b) of (22) reaches the end (11a) of the tube material guide surface (11) of the joint (1), the outward surface (12) and the inward surface (13) of the joint (1). A gap (30) extending toward the inner wall surface (10b, 20b) is formed between the outer surface and the outer surface (12) and the inner surface (13) of the joint (1) by expansion during heating. However, the pipe end cutting method is characterized in that the gap (30) is eliminated and air is released so as to be pushed out.

The present invention operates as follows.
The tube end portion (20) of the tube material (2) is inserted into a thermoplastic resin joint (1) having an end surface composed of a plurality of surfaces (11, 12, 13) inside the tube end portion (10). In order to join the end portions (10, 20) by heat welding, the tube end portion (20) of the tube material (2) needs to have a joining structure that matches the tube end portion (10) of the joint (1). There is. A tube material guide surface (11) with which the outer wall surface (20a) of the tube material (2) to be inserted into the tube end portion (10) is formed at the tube end portion (10) of the joint (1), From the terminal end (11a) of the tube material guide surface (11), an outward surface (12) is formed in the center of the tube end portion (10) and toward the tube end exit. Furthermore, from the front end (12a) of the outward face (12), an inward face (13) that reaches the inner wall surface (10b) toward the center in the pipe end part (10) and toward the inner end of the pipe end part is formed. .

  The tube material (2) is cut so as to have end faces corresponding to the plurality of faces (11, 12, 13) formed inside the pipe end (10) of the joint (1). The following end face is formed in the pipe end part (20) after cutting the tube material (2). That is, the outer surface (22) from the outer wall surface (20a) of the tube end (20) of the tube material (2) to the inner wall surface (20b) and toward the inner back of the tube material (2), An inner surface (23) extending from the end (22a) of the surface (22) to the inner wall surface (20b).

  The outer surface (22) and the inner surface (23) connect the tube end (20) of the tube material (2) to the joint (1) in order to heat-weld the tube material (2) to the joint (1). When the pipe end (10) is inserted to a predetermined position, a gap (30) is formed between the outward face (12) and the inward face (13) of the joint (1), and the gap increases toward the inner wall face (10b, 20b). ). When the tip (22b) of the outer surface (22) reaches the terminal end (11a) of the tube material guide surface (11) of the joint (1), the outward surface of the joint (1) is formed from the terminal end (11a). The gap (30a) is formed so that the angle with (12), that is, the gap is increased.

  The inner surface (23) extending from the terminal end (22a) of the outer surface (22) to the inner wall surface (20b) is spaced from the inner surface (13) of the joint (1) toward the inner wall surface (20b). The gap (30b) is formed. The gap (30b) continues from the gap (30a) formed by the outer surface (22) and the outward face (12) of the joint (1), and the gap is further expanded than the gap (30a). .

  In the heat welding of the tube material (2) having the tube end (20) and the joint (1), first, the outer surface (22) of the tube material (2) is expanded by heating and expansion of both. And the outward surface (12) of the joint (1) come into contact with each other while allowing air to escape from the portion where they intersect each other. The contact surface between the outer surface (22) of the tube material (2) and the outer surface (12) of the joint (1) also expands to a region where the interval has increased as the expansion proceeds. Thereby, the outer surface (22) of the tube material (2) and the outward surface (12) of the joint (1) are welded without any gap remaining therebetween.

  As the heating continues, the tube ends (10, 20) of the tube material (2) and the joint (1) continue to expand, and the outer surface (22) of the tube material (2) and the outward surface of the joint (1) When the gap (30a) with (12) disappears, the contact surface between the inner surface (23) of the tube material (2) and the inward surface (13) of the joint (1) expands in the same manner. This eliminates the gap (30b) while allowing the air between them to escape. When the temperature exceeds the melting temperature, the tube ends (10, 20) of the tube material (2) and the joint (1) are melted and the outer surface (22) of the tube material (2) and the outward direction of the joint (1) The surface (12), the inner surface (23) of the tube material (2) and the inward surface (13) of the joint (1) are completely welded, and the welding of the tube material (2) and the joint (1) is completed. .

  Thus, it can join, without generating a space | gap in a welding part by heat-welding a tube material (2) and a coupling (1). Moreover, since the gap (30) between the tube material (2) and the joint (1) is wider as it is closer to the inner wall surface (10b, 20b), the expansion of the welded portion due to heating is absorbed and the bead is The tube material (2) and the joint (1) can be joined by heating and welding while reducing or minimizing the generation.

  According to the tube material joining structure, the tube material joining method, and the pipe end cutting method according to the present invention, this joint can be applied to a thermoplastic resin joint having a plurality of end faces inside the pipe end. Since the end face of the tube material joined to the joint has a plurality of cut surfaces that form gaps extending toward the inner wall surface with the plurality of surfaces of the joint when inserted into the joint, the plurality of tube materials are expanded by expansion during heating. The end face of the joint and the end face of the joint can be released to extrude air by eliminating the gap while expanding the contact surface, and the tube material and the joint can be heated and welded without generating a gap in the welded part. Can be joined.

  In addition, the gap near the inner wall surface of the pipe end of the joint and the tube end of the tube material is wide, so that bulging inward of the welded portion can be absorbed to reduce or minimize the occurrence of beads. it can.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
Each figure shows an embodiment of the present invention.
FIG. 1 is a longitudinal sectional view showing respective tube end portions when a tube material having a joining structure according to an embodiment of the present invention is joined to a joint by heat welding.

  As shown in FIG. 1, the joint 1 has an end surface 10 including a plurality of surfaces 11, 12, and 13 inside the tube end portion 10, and is made of a thermoplastic synthetic resin. The plurality of surfaces 11, 12, and 13 are a tube material guide surface 11, an outward surface 12, and an inward surface 13 in order from the outside of the tube end portion 10.

  The tube material guide surface 11 is concentrically formed between the outer wall surface 10a and the inner wall surface 10b of the tube end portion 10. Since the diameter of the tube material guide surface 11 is only slightly larger than the outer diameter of the tube material 2 and is substantially the same, the tube end 20 of the tube material 2 is inserted into the tube end 10. It will be in the state which contacted the outer wall surface 20a of the tube material 2. FIG.

  The outward surface 12 is formed from the terminal end 11 a of the tube material guide surface 11 toward the center axial direction (center) inside the tube end 10 and toward the outlet of the tube end 10. Therefore, the outward surface 12 and the tube material guide surface 11 form an acute angle.

  The inward surface 13 is formed from the distal end 12 a of the outward surface 12 to the inner wall surface 10 b of the tube end 10 toward the center axis inside the tube end 10 and toward the inner back of the tube end 10. That is, the inward surface 13 extends from the direction in which the outward surface 12 extends in the direction of turning back at the tip 12a.

  Similar to the joint 1, the tube material 2 is made of a thermoplastic synthetic resin. Two characteristic surfaces 22 and 23 are formed inside the tube end portion 20 of the tube material 2.

  One of the surfaces is an outer surface 22 that extends from the outer wall surface 20 a of the tube end portion 20 toward the inner wall surface 20 b and toward the inner depth of the tube end portion 20. That is, the outer surface 22 expands at an angle that turns back from the outer wall surface 20a to the inner depth at the tube end. The end 22a of the outer surface 22 is located inward of the tube material 2 with respect to the position of the tip 12a of the outward surface 12 of the joint 1 in a state where the tube material 2 has been inserted into the joint 1.

  The other surface is an inner surface 23 formed from the end 22a of the outer surface 22 to the inner wall surface 20b. In FIG. 1, the inner surface 23 is shown to be substantially orthogonal to the inner wall surface 20 b, but this is an example, and the inner surface 23 may be formed so as to go from the terminal end 22 a toward the tube end side of the tube material 2. On the contrary, the tube material 2 may be formed so as to go inward.

  FIG. 1 shows a state in which the tube end 20 of the tube material 2 is inserted into the tube end 10 of the joint 1 in order to heat-weld the joint 1 and the tube material 2. A tubular support member 40 is attached to the pipe end portion 10 of the joint 1 so as to surround the outer wall surface 10a.

  In the support member 40, the inner wall surface 42 contacts the joint 1 and the tube material 2. For this reason, at least the inner wall surface 42 is made of a material to which the molten joint 1 and the tube material 2 are difficult to weld. Examples of such a material include PTFE and modified PTFE. A heat transfer member (not shown) for transferring heat from a heating device (not shown) is disposed on the outer wall surface 41 side of the support member 40.

  The tube material guide surface 11 of the joint 1 and the outer wall surface 20a of the tube material 2 are in contact with each other. In this state, the tip 22 b of the outer surface 22 reaches the end 11 a of the tube material guide surface 11 of the joint 1. Further, a gap 30 is formed between the outer surface 12 to the inner surface 13 of the joint 1 and the outer surface 22 to the inner surface 23 of the tube member 2 so as to expand toward the inner wall surfaces 10b and 20b. . The gap 30 is formed by a gap 30 a formed by the outward surface 12 of the pipe end 10 of the joint 1 and the outer surface 22 of the pipe end 20 of the tube material 2, and subsequently the pipe end 10 of the joint 1. It consists of a gap 30 b formed by the inward surface 13 and the inner surface 23 of the tube end 20 of the tube material 2.

  The gap 30 a is closed at the contact portion where the terminal end 11 a of the tube material guide surface 11, which is the starting end of the outward surface 12, and the tip 22 b of the outer surface 22 contact. The angle formed by the outward surface 12 and the outward surface 22 is increased from the contact portion toward the distal end 12a of the outward surface 12 and from the contact portion toward the terminal end 22a of the outward surface 22. The gap 30b is formed to further expand toward the inner wall surfaces 10b and 20b. The gap 30b is wide enough to prevent the beads bulging from the inner wall surfaces 10b and 20b from being generated even when the tube end 10 and the tube end 20 expand during heat welding.

FIGS. 4 to 12 are views showing a tube material cutter for providing the outer surface 22 and the inner surface 23 (a plurality of cut surfaces) as described above at the tube end of the tube material 2.
FIG. 4 is an exploded perspective view showing the tube material cutting device 100, and FIG. 5 is a perspective view showing the tube material 2 and the tube material cutting device 100. The tube material cutting device 100 includes a fixing device 110 for holding and fixing the tube material 2, a fixing screw 120 for tightening the tube material 2 passed through the fixing device 110, and a tube fixed by the fixing device 110. And a cutting tool 130 for cutting the tube end 20 of the material 2.

  A tube material holding hole 111 for holding the tube material 2 is formed in a substantially central portion of the fixture 110 so as to penetrate therethrough. Further, a gap 112 reaching the tube material holding hole 111 extends from the side surface 110 a of the fixture 110. Further, the gap 113 extends in the diametrical direction in which the gap 112 extends beyond the tube material holding hole 111.

  From the upper surface 110b of the fixture 110, a screw hole 114 is formed below. The screw hole 114 is formed up to the bottom of the gap 112. When the fixing screw 120 is screwed into the screw hole 114 and tightened, the gap 112 becomes narrow, so that the tube material 2 passed through the tube material holding hole 111 can be fixed.

  As shown in FIG. 10, the cutting tool 130 is formed with a fitting recess 131 for fitting the pipe end 20 of the tube material 2. A blade body 132 for cutting the tube end portion 20 of the tube material 2 to form the outer surface 22 and the inner surface 23 as described above is attached to the cutting tool 130 with screws. The blade edge 132 a of the blade body 132 faces the fitting recess 131. Further, as shown in FIG. 12, the cutting edge 132 a has a shape that forms the outer surface 22 and the inner surface 23.

  In order to cut the tube end portion 20 of the tube material 2 with such a tube material cutting device 100, first, the tube material 2 is passed through the tube material holding hole 111 of the fixture 110 and the tube end portion 20 is moved as shown in FIG. Keep it out. Next, as shown in FIGS. 7 and 9, the cutting tool 130 is pressed against the tube end portion 20 so that the tube end portion 20 of the tube material 2 is fitted into the fitting recess 131.

  Next, as shown in FIG. 8, the fixing screw 120 is rotated in the direction of arrow A. As the fixing screw 120 is turned, the gap 112 of the fixing tool 110 is narrowed, and the tube material 2 passed through the tube material holding hole 111 is tightened and fixed. Next, as shown in FIG. 11, when the cutting tool 130 is rotated one or more times in the direction of arrow A, the tube material 2 is cut, and an outer surface 22 and an inner surface 23 are formed at the tube end 20. Is done.

Next, the operation will be described.
In order to heat-weld the tube material 2 having the tube end portion 20 as described above to join the joint 1, first, the tube end portion 20 of the tube material 2 is inserted into the tube end portion 10 of the joint 1. The tube end 20 is inserted until the tip 22b of the tube end 20 abuts the terminal end 11a of the tube material guide surface 11 formed in the tube end 10 of the joint 1. As a result, the outer surface 22 and the inner surface 23 of the tube material 2 form gaps 30a and 30b whose distances increase toward the inner wall surfaces 10b and 20b between the outer surface 12 and the inner surface 13 of the joint 1. (Insertion process).

  The outer surface 22 of the tube material 2 has a gap 30a so that the angle between the end 11a and the outward surface 12 of the joint 1 opens when the tip 22b reaches the end 11a of the tube material guide surface 11 of the joint 1. Is forming.

  At this time, the inner surface 23 extending from the terminal end 22a of the outer surface 22 of the tube material 2 to the inner wall surface 20b forms a gap 30b whose distance from the inward surface 13 of the joint 1 widens toward the inner wall surfaces 10b and 20b. is doing. The gap 30b continues from a gap 30a formed by the outer surface 22 of the tube material 2 and the outward surface 12 of the joint 1, and the interval is further expanded than the gap 30a.

  When heat from a heating device (not shown) is conducted to the tube end 10 of the joint 1 and the tube end 20 of the tube material 2 through the support member 40 (heating step), the tube end 10 of the heated joint 1 and The tube end 20 of the tube material 2 expands. Due to this expansion, the contact surface of the distal end 22b of the outer surface 22 of the tube material 2 and the outward surface 12 of the joint 1 expands from the contact portion where the end 11a of the tube material guide surface 11 where the outward surface 12 starts is in contact. To do. As a result, the gap 30a is closed. When the gap 30a is closed, the contact surface pushes out air and escapes toward the inner wall surfaces 10b and 20b (heating maintaining step).

  As shown in FIG. 2, the contact surface between the outer surface 22 of the tube material 2 and the outer surface 12 of the joint 1 sequentially expands to a wider region as the expansion proceeds. The tube end 10 and the tube end 20 are melted when they reach the melting temperature by heating. Thereby, a contact surface welds and the pipe end parts 10 and 20 become united. In this way, the joint 1 and the tube material 2 can be welded and joined without leaving a gap between the outer surface 22 of the tube material 2 and the outward surface 12 of the joint 1.

  When the gap 30a is closed, the inward surface 13 and the inward surface 23 come into contact with each other, and the contact surfaces expand toward the inner wall surfaces 10b and 20b. Thereby, the gap 30b is closed, and at that time, the contact surface allows air to escape toward the inner wall surfaces 10b and 20b. When the inner surface 13 of the tube end 10 and the inner surface 23 of the tube material 2 reach the melting temperature, their contact surfaces are welded and united by melting.

  The gap 30b is widely spaced so as to absorb the bulging of the welded portion toward the inner wall surfaces 10b and 20b even when the tube end 10 and the tube end 20 expand and melt. Thereby, even if the gap 30b is completely closed and welded by expansion and melting, the occurrence of beads on the inner wall surfaces 10b and 20b is minimized as shown in FIG. Furthermore, the method of taking the interval 30 can reduce or minimize the occurrence of beads or dents in the welded portion, and can make the welded portion substantially smooth.

  As described above, the tube material 2 and the joint 1 can be heat-welded and joined without generating a gap in the welded portion between the joint 1 and the tube material 2.

  In addition, it is possible to reduce or minimize the occurrence of beads bulging or generating dents on the inner wall surface 10b, 20b side of the welded portion.

It is a longitudinal cross-sectional view which shows each pipe | tube edge part when joining the tube material which has the joining structure which concerns on one embodiment of this invention to a joint by heat welding. It is explanatory drawing which shows the state in the middle of the process of joining the tube material which has the joining structure which concerns on one embodiment of this invention by heat welding. It is explanatory drawing which shows the state which joined the tube material which has the joining structure which concerns on one embodiment of this invention by heat welding. It is a disassembled perspective view which shows the tube material cutter for cut | disconnecting a tube material. It is a perspective view which shows a tube material and a tube material cutting device. It is a perspective view which shows the state which passed the tube material through the fixture of the tube material cutting device. It is a perspective view which shows the state which made the cutting tool fit the pipe | tube edge part of the tube material which let the fixing tool pass. It is a perspective view which shows operation which fixes a tube material to a fixing tool. It is a side view which shows the state which fixed the tube material to the fixing tool. It is a longitudinal cross-sectional view which shows the state which fixed the tube material to the fixing tool. It is a perspective view which shows operation which cut | disconnects a tube material. It is a top view which shows the blade body attached to the cutting tool of a tube material cutter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Joint 2 ... Tube material 10 ... Pipe end part 10a ... Outer wall surface 10b ... Inner wall surface 11 ... Tube material guide surface 11a ... Termination 12 ... Outward surface 12a ... Tip 13 ... Inward surface 20 ... Pipe end part 20a ... Outer wall surface 20b ... inner wall surface 22 ... outer surface 22a ... terminal 22b ... tip 23 ... inner surface 30 ... gap 30a ... gap 30b ... gap 40 ... support member 41 ... outer wall surface 42 ... inner wall surface 100 ... tube material cutter 110 ... fixing tool 110a ... side surface 110b ... upper surface 111 ... tube material holding hole 112 ... gap 113 ... gap 114 ... screw hole 120 ... fixing screw 130 ... cutting tool 131 ... insertion recess 132 ... blade body 132a ... blade edge

Claims (5)

In the joining structure of the tube material of the thermoplastic resin, the tube end portion is inserted into the joint of the thermoplastic resin having an end surface composed of a plurality of surfaces inside the tube end portion, and the tube end portions are joined together by heat welding.
The end surface of the tube material is composed of a plurality of cut surfaces that form gaps that expand toward the inner wall surface with the plurality of surfaces of the joint when inserted into the joint,
The tube member joining structure characterized in that the plurality of cut surfaces and the end surfaces of the joints are released so as to extrude air by eliminating the gap while expanding the contact surfaces by expansion during heating. In the joining structure of the tube material of the thermoplastic resin, the tube end portion is inserted into the joint of the thermoplastic resin having an end surface composed of a plurality of surfaces inside the tube end portion, and the tube end portions are joined together by heat welding.
The plurality of surfaces of the joint include a tube material guide surface that is in contact with the outer wall surface of the tube material to be inserted into the tube end portion, an outward surface that is centered from the end of the tube material guide surface toward the tube end portion, and the outward direction. An inward surface that reaches the inner wall surface from the tip of the surface toward the center and the inner end of the pipe end,
The tube end portion of the tube material has an end surface composed of an outer surface from the outer wall surface toward the inner wall surface and toward the inner depth, and an inner surface from the end of the outer surface to the inner wall surface,
The outer side surface and the inner side surface are inserted into the joint for heat welding, and in a state where the tip of the outer side surface reaches the end of the tube material guide surface of the joint, A gap extending toward the inner wall surface is formed between the inner surface and the inner surface so that the air is pushed out by expanding the contact surface with the end surface of the joint from the tip of the outer surface by expansion during heating, thereby eliminating the gap. A tube material joining structure characterized by the fact that Heating a thermoplastic resin tube material having a plurality of cut surfaces at the tube end portion forming a gap between the plurality of surfaces in a thermoplastic resin joint having a plurality of end surfaces inside the tube end portion It is a method of joining tube materials that are welded and joined,
The tube end portion of the tube material is inserted inside the tube end portion of the joint to form the gap extending toward the inner wall surface between the plurality of surfaces of the joint and the plurality of cut surfaces of the tube material. Insertion process;
A heating step of heating from the outer wall surface side of the tube end portion to the melting temperature at least around the tube end portion;
A heating maintaining step of maintaining heating until a plurality of surfaces of the joint and a plurality of cut surfaces of the tube material are expanded by contact with each other while expanding a contact surface to escape the air so as to extrude and weld. And a tube material joining method. Insert a pipe end into a thermoplastic resin joint having a plurality of end faces inside the pipe end, heat weld the pipe ends together, and pipe the thermoplastic resin tube material for welding A tube end cutting method for cutting into a shape,
A cutting step of cutting the tube material and forming an end surface composed of a plurality of cut surfaces that form gaps extending toward an inner wall surface with the plurality of surfaces of the joint when inserted into the joint; ,
The pipe end cutting method characterized in that the plurality of cut surfaces are released so as to extrude air while eliminating the gaps while expanding contact surfaces with the plurality of surfaces of the joint by expansion during heating. Insert a pipe end into a thermoplastic resin joint having a plurality of end faces inside the pipe end, heat weld the pipe ends together, and pipe the thermoplastic resin tube material for welding A tube end cutting method for cutting into a shape,
The plurality of surfaces of the joint include a tube material guide surface that is in contact with the outer wall surface of the tube material to be inserted into the tube end portion, an outward surface that is centered from the end of the tube material guide surface toward the tube end portion, and the outward direction. An inward surface that reaches the inner wall surface from the tip of the surface toward the center and the inner end of the pipe end,
An outer surface that cuts the tube material from the outer wall surface of the tube material toward the inner wall surface and toward the inner wall of the tube material, and an inner surface that extends from the end of the outer surface to the inner wall surface A cutting step for forming an end face comprising:
The outer surface and the inner surface of the cut tube material were inserted into the joint for heating and welding, and the distal end of the outer surface reached the end of the tube material guide surface of the joint. In the state, a gap extending toward the inner wall surface is formed between the outward face and the inward face of the joint, and the gap is eliminated while contacting the outward face and the inward face of the joint by expansion during heating. A method for cutting the end of a tube, wherein the air is released so as to be pushed out.

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