JP3078055U - Tube that is closed by integrally molding the end opening - Google Patents

Abstract

(57) [Problem] To provide a high-strength occlusion tube that can be manufactured easily and in a short time without using a complicated manufacturing process. SOLUTION: The present invention comprises a tube body 3 having a predetermined thickness in a tube whose end opening is integrally formed and closed, and a closing portion 31 for closing the end opening of the tube main body 3. The closing portion 31 is formed by heating and softening the end of the tube main body 3 while rotating the tube main body 3 in the circumferential direction and deforming under pressure by the mold B. It is characterized in that it has a thick predetermined shape and is integrated with the end of the tube body 3.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 According to the present invention, an open end of a tube having an opening at least at one end is deformed while being heated, and the end is integrally molded and sealed to form a closed portion. For closed tubes.

[0002]

[Prior art]

 Generally, in order to close the open end of a tube having an opening at least at one end, there is a method of welding a blind plate 11 to the end 10 of the tube 1 as shown in FIG. This tube 1 can be generally applied to a hydraulic cylinder, a pneumatic cylinder, a shock absorber and the like.

However, this method is complicated, the manufacturing cost is high, and the manufactured tube 1 has an adverse effect on the appearance by welding. In addition, the size accuracy is poor and bubbles are easily generated in the welded portion, so that the joint strength is insufficient and the pressure resistance is reduced. Furthermore, there is a problem that the weld and the surrounding area are easily damaged, and the original strength may be lost.

[0004] Next, there is a method of using a roller to close the open end as described above by integral molding, which is disclosed in Japanese Patent No. 81216620 published on February 11, 1993. . As shown in FIG. 10, the tube 2 is rotated in the circumferential direction, and the end portion 20 of the tube 2 is placed between the upper and lower rollers 21 and 22, respectively. Is gradually deformed to obtain a tube in which the end 20 is almost closed.

[0005]

[Problems to be solved by the invention]

 However, since this tube always has a small gap 23 at the front of the end portion 20 as shown in FIG. 11 and cannot be completely closed, it must be closed in combination with another processing method. The deformation of the end portion 20 takes a considerable time, and the thickness of the processed end portion 20 and the thickness of the tube 2 substantially match each other. Since the internal stresses applied to both of them differ greatly, the stresses are not alleviated at the same time. For example, if the internal stress of the end portion 20 remains, there is a problem that the withstand voltage of the end portion 20 decreases and the possibility of breakage increases.

The present invention has been made in order to solve such a problem, and a closed portion of various shapes is easily molded and closed at an open end of a tube having an opening at at least one end. It is another object of the present invention to provide a tube in which the closing portion has high strength and the opening at the end portion is integrally formed and closed.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, a device according to the present invention is characterized in that a tube body having a predetermined thickness and an end opening of the tube body are formed in a tube whose end opening is integrally formed and closed. A closing portion for closing the tube body, wherein the closing portion is formed integrally with the end portion of the tube main body by molding the end portion of the tube main body into a unitary form, and has a shape thicker than the wall thickness of the tube main body. It is characterized by doing.

According to the first aspect of the present invention, a high-strength occlusion tube can be obtained simply and in a short time without using a complicated manufacturing process. Further, the shape of the closing part can be appropriately set according to actual needs. That is, by changing the shape of the mold, various closed part shapes can be realized.

According to a second aspect of the present invention, in the tube according to the first aspect, the closed portion has one of a conical shape, a spherical shape, and a planar shape. I do.

[0010] According to the invention described in claim 2, it is possible to adapt to the needs of different shapes and standards.

According to a third aspect of the present invention, in the tube according to the first or second aspect, the closing portion has a shaft extending in a longitudinal direction of the tube main body. Is characterized in that any one of a screw, a spherical block, and a fitting groove is formed.

According to the invention described in claim 3, the tube can be connected to various devices via the screw, the spherical block, and the fitting groove.

[0013]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment First, a first embodiment will be described with reference to FIGS. In this embodiment, an end (not shown) having an opening is heated by a heater A while rotating a metal tube (tube main body) 3 having an opening at at least one end in a circumferential direction of the tube 3. Heat to soften until just before the metal at this end melts. While the tube 3 is being rotated, the mold B is pressed against the softened end to deform it under pressure, so that the wall of the deformed end is thicker than the wall of the tube 3. Then, the end portion is sealed to form a closed portion 31 having a predetermined shape. The closed portion 31 is cooled and solidified, and the opening at the end is integrally formed to form a closed tube. The wall thickness of the closed portion 31 may be several times the wall thickness of the tube 3 and can withstand a pressure equal to or greater than that of the tube 3. Thus, the closure is integrally fused to the end of the tube 3.

Further, by using the mold B having a predetermined shape, the closing portion 31 can be formed in various shapes such as a conical shape (FIG. 1), a hemispherical shape (FIG. 2), and a flat shape (FIG. 3). When the closed portion 31 is cut in parallel with the circumferential direction of the tube, all the cross-sectional shapes become circular.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. As in the first embodiment, while rotating a metal tube having an opening at at least one end in the circumferential direction of the tube, an end (not shown) having the opening is heated (see FIG. 1). (Not shown) to soften. While the tube is being rotated, a mold (not shown) is pressed against the softened end to deform it under pressure, and as shown in FIGS. The lever body (shaft) 33 is integrally formed so as to have a projection, or as shown in FIG. 6, the lever body 33 is integrally formed so as to further have a ball body 331 at the tip of the lever body 33. The end is sealed by molding, the lever body 33 is cooled and solidified, and the opening at the end is integrally formed to form a closed tube.

The protrusion of the lever body 33 having a columnar protrusion is threaded to form a screw thread (screw) 330 (FIG. 4). It can be fixed to other various equipment. Further, a fitting groove (fitting groove) 332 is provided near the tip of the projection of the lever body 33 whose tip is a cylindrical protrusion (FIG. 5), and when this fitting groove 332 and the C-shaped clamp D are combined, The tube can be fixed to various equipment (Fig. 7).

In a tube whose end is closed by a lever body 33 having a ball body (spherical block) 331 at the tip, the ball body 331 is fitted into the concave groove C (FIG. 8). It can be freely rotated. In other words, by forming a closed part such as a lever body on the tube as one piece, and further processing this closed part into various shapes, the convenience of connecting the tube with the closed end to various equipment is improved. .

When these lever bodies 33 are cut in parallel with the circumferential direction of the tube, the cross-sectional shape becomes circular, as in the first embodiment.

Further, as in the first and second embodiments, after forming a tube having a closed end, if necessary, the tube is subjected to various heat treatments such as quenching, tempering, and annealing. The material properties can be changed by the application, so the practicality of this tube can be increased and the operating range can be expanded.

Although the embodiments have been specifically described with reference to the drawings, the present invention is not limited to the above-described embodiments, and is performed within a scope that does not depart from the gist of the invention. Including all implementations.

[0022]

[Effect of the invention]

 As described above, according to the present invention, it is possible to integrally form a tube having an open end so as to provide closed portions of various shapes.

Further, according to the present invention, there is an effect that a high-strength closed portion is formed by integrally molding a tube having an open end.

[Brief description of the drawings]

FIG. 1 is a schematic view of a tube according to a first embodiment in which a closed portion of a tube has a conical shape.

FIG. 2 is a schematic view of a tube according to the first embodiment in which a closed portion has a hemispherical shape.

FIG. 3 is a schematic diagram of the tube according to the first embodiment when the shape of the closed portion of the tube is planar.

FIG. 4 is a schematic diagram showing a case where a closed portion of a tube according to a second embodiment is a lever body, and the lever body is cut into a thread by cutting the lever body.

FIG. 5 is a schematic view showing a case where a closing portion of a tube according to a second embodiment is a lever body, and the lever body is machined to have a fitting groove.

FIG. 6 is a schematic diagram of a tube according to a second embodiment in which a closed portion of a tube is a lever, and a ball is machined with a die at the end of the lever;

FIG. 7 is a schematic diagram when a C-type clamp is fixed to a fitting groove of a lever body of a tube according to a second embodiment.

FIG. 8 is a schematic view of a tube lever according to a second embodiment in which a ball at the tip of a lever is mounted in a concave groove.

FIG. 9 is a schematic view showing a case where an end of a tube according to the related art is closed by welding.

FIG. 10 is a schematic view of a conventional technique in which an end of a tube is closed by two rollers.

FIG. 11 is a schematic view of a conventional technique in which an end of a tube is hemispherically closed with a gap by two rollers.

[Explanation of symbols]

1, 2, 3, ... tube (tube body), 10, 20, ...
Ends, 11 ... Blinds, 22, 22 ... Rollers, 23 ...
Gap, 31 ... closing part, 33 ... lever body (shaft), 330
... Screw thread (screw), 331 ... Ball body (spherical block), 332 ... Fit groove (Fit groove), A ... Heating device, B ...
Die, C: concave groove, D: C-type clamp

Claims (3)

[Utility model registration claims] 1. A tube main body having a predetermined thickness, and a closing portion for closing an end opening of the tube main body,
The closing portion is molded into a form in which the end of the tube main body is integrally fused, and is formed integrally with the end of the tube main body with a shape thicker than the wall thickness of the tube main body. A tube whose opening is integrally molded and closed. 2. The tube according to claim 1, wherein the closing portion has one of a conical shape, a spherical shape, and a planar shape. 3. The closure section has a shaft extending in the longitudinal direction of the tube main body, and the shaft is formed with any one of a screw, a spherical block, and a fitting groove. The tube according to claim 1 or 2.