JPH0626740B2 - End treatment method for grooved pipe material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is used for a refrigerant passage and a heat pipe of a heat exchanger such as a refrigerator, an air conditioner for automobiles, an air conditioner for general buildings, and a showcase of a store. The present invention relates to a method for treating an end portion of a grooved pipe material.

<Prior Art> Conventionally, a grooved pipe material having a groove formed on an inner surface thereof may be used for a refrigerant passage or a heat pipe of a heat exchanger in order to improve a heat exchange rate to the pipe material.

Various types of heat exchange media may be used depending on the application, such as a heat exchange medium that is enclosed and circulated inside the above-mentioned grooved pipe material, and a highly volatile heat exchange medium may be used. High air-tightness and liquid-tightness are also required at the end portion after filling the inside with the heat exchange medium.

Therefore, conventionally, in the treatment of the end portion of the grooved pipe material as described above, it is not possible to draw to a diameter that can be welded by a press like a normal pipe material having no groove on the inner surface, so that the opening end portion is covered. A method of sealing by covering with a material has been adopted.

The above-mentioned conventional end treatment method for a grooved pipe material, first, the pipe material is half-drawn by a press, then the lid material having a thin tube is welded to the end portion of the above-mentioned pipe material, and the nozzle is connected to the thin tube. After filling the heat exchange medium, the thin tube was cut and the cut surface of the thin tube was welded.

<Problems to be Solved by the Invention> However, in the method as described above, the number of steps is large, the work is complicated, and the lid material is required, so that the manufacturing cost is high.

Further, since the end portion of the grooved pipe material cannot be sufficiently reduced in diameter by drawing with a press, the welding of the end portion of the pipe material and the lid component is extremely troublesome, and there is a possibility that the pressure resistance of the welded portion and the welding leakage may occur. there were.

<Means for Solving the Problems> The present invention has been proposed in view of the above, and a forming portion that is recessed in an arc shape is formed on the surface of the rotating member between the large diameter portion at the base end and the small diameter portion at the tip. One forming roll is provided so as to be freely rotatable and movable in the radial direction of the rotating member, and the tip end portion of the grooved pipe material having the groove formed on the inner surface in the longitudinal direction is positioned at the center of surface rotation of the rotating member. By facing the forming roll and rotating the rotating member, the tip of the grooved pipe material is contracted at the forming part of the forming roll by the revolution and free rotation of the forming roll and the radial movement of the forming roll. The present invention relates to a method for processing an end portion of a grooved pipe material, which is characterized in that the pipe is drawn so as to have a diameter.

<Examples> Examples of the present invention will be described in detail below with reference to the drawings.

According to the method for treating an end portion of a grooved pipe material of the present invention, the tip end portion of the grooved pipe material 1 having a groove formed on the inner surface in the longitudinal direction as shown in FIG. 1 is sufficiently reduced in diameter to form the groove shown in FIG. It is drawn like the attached pipe material 1 '.

As shown in FIG. 3, the end treatment device 2 used in the present invention allows one molding roll 4 to freely rotate on the surface of the rotating member 3 which rotates at a high speed, and moves in the radial direction of the rotating member 3. It is provided as possible.

The above-described forming roll 4 has a forming portion 7 that is recessed in an arc shape between the large diameter portion 5 at the base end and the small diameter portion 6 at the tip end, and is free to rotate and rotate on the surface of the rotating member 3. Member 3
It has a support axis parallel to the rotation axis of.

The forming roll 4 described above can be moved in the radial direction of the rotating member 3 by, for example, a cylinder mechanism (not shown).

In order to draw the tip portion of the pipe material 1 by the end treatment device 2 as described above, first, the pipe material 1 is positioned on the surface of the rotation center portion of the rotating member 3, and the tip portion of the pipe material 1 is formed into a forming roll. Fixing means 8 such as a clamp so as to face 4
Fixed by.

Next, the rotating member 3 is rotated at a high speed by an appropriate driving device (not shown) to revolve the forming roll 4 based on the rotation of the rotating member 3, and the forming roll 4 contacts the tip portion of the pipe material 1. In the same manner (arrow in Fig. 3).

Then, the outer surface of the molding roll 4 is revolved and idle while always contacting the tip portion of the pipe material 1, and the molding roll 4 is moved in the radial direction toward the center of rotation of the rotating member 3 to move the tip portion of the pipe material 1. By gradually and firmly pressing, the diameter can be sufficiently reduced.

Therefore, the pipe material 1 reduced in diameter by the above-described method of the present invention
The front end portion of is shaped into a shape corresponding to the arc-shaped forming portion 7 of the forming roll 4.

In the present invention described above, the forming roll 4 continuously presses only a part of the tip end portion of the pipe material 1, and for example, presses the entire peripheral edge of the tip end portion of the pipe material 1 at the same time as in the conventional drawing process. Therefore, the deformation rate of the pipe material 1 can be increased, and even the end portion having an extremely small diameter can be processed as compared with the conventional drawing process.

Further, since the forming roll 4 pressed by the pipe material 1 idles, the resistance can be suppressed to a minimum and the generation of frictional heat can be suppressed. Further, the rotating condition of the rotating member 3 and the radial direction of the forming roll 4 can be suppressed. By adjusting the moving speed of, the uniform drawing process can be performed, and the surface condition of the drawn tip portion becomes extremely beautiful.

The grooved pipe material 1 reduced in diameter according to the present invention described above is used as a cooling passage or a heat pipe by filling the heat exchange medium from the reduced diameter small opening end and closing the opening end by welding or the like. You can

Therefore, when the present invention is applied to the production of a cooling passage or a heat pipe of a heat exchanger, it is possible to reduce the number of steps as compared with the conventional processing method described above, and since the diameter of the opening end is small, Welding work can be easily performed, and the pressure resistance of the welded portion and the risk of welding leakage can be eliminated.

<Effects of the Invention> In short, according to the present invention, one forming roll having a forming portion that is recessed in an arc shape between the large diameter portion of the base end and the small diameter portion of the tip end is formed on the surface of the rotating member. Possible and movably provided in the radial direction of the rotating member, the tip end portion of the grooved tube material having a groove formed in the inner surface in the longitudinal direction is positioned at the center of the surface rotation of the rotating member to face the forming roll, By rotating the rotating member, the forming roll is revolved and freely rotated, and the radial movement of the forming roll causes the forming portion of the forming roll to reduce the diameter of the tip portion of the grooved pipe material. It is characterized by having done. Therefore, not only can the diameter be reduced to a desired diameter continuously by the one-step treatment step, but also the diameter reduction processing can be performed by only one forming roll, so that only a part of the tip end portion of the pipe material is constantly pressed,
Moreover, the deformation rate of the pipe material can be gradually increased by the radial movement of the forming roll, and the state of an extremely small diameter can be easily processed.

Furthermore, the edge treatment method of the present invention can be easily assembled as a device having a simple structure, and can be automated to provide further practicality.

Therefore, the grooved pipe material having a reduced diameter according to the present invention reduces the number of working steps in the production of the cooling passage or the heat pipe of the heat exchanger, and facilitates the welded portion without the risk of pressure resistance and welding leakage, It can be easily formed.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show one embodiment of the present invention. FIG. 1 is a perspective view of a grooved pipe material before carrying out the invention, and FIG. 2 is a groove after carrying out the invention. FIG. 3 is a perspective view of the attached pipe material, FIG. 3 is a schematic side view of the end treatment device, and FIG. 4 is a front view of the same. (Explanation of Reference Signs) 1 is a grooved pipe material, 3 is a rotating member, 4 is a forming roll, 5 is a large diameter portion, 6 is a small diameter portion, and 7 is a forming portion.

Claims (1)

[Claims] Claim: What is claimed is: 1. A single forming roll having a forming portion which is recessed in an arc shape between a large-diameter portion at the base end and a small-diameter portion at the distal end formed on the surface of the rotating member so as to be freely rotatable and to have a diameter of the rotating member. Movably provided in the inner surface, the tip end portion of the grooved pipe material having a groove formed in the inner surface in the longitudinal direction is positioned at the center of the surface rotation of the rotating member to face the forming roll, and the rotating member is rotated. A groove characterized in that the orbital and idle rotations of the forming roll and the radial movement of the forming roll cause the tip end portion of the grooved pipe material to be reduced in the forming portion of the forming roll. End treatment method for attached pipe material.