JP2724521B2 - Method for manufacturing fin tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a seamless fin tube by rolling a fin tube using a rolling machine, and more particularly to a method for producing a fin tube having different fin outer diameters. .

[0002]

2. Description of the Related Art FIG. 5 illustrates a conventional roll processing machine for producing a fin tube. In the drawing, reference numeral 1 denotes a frame of the processing machine, and 2 denotes a processing head. In FIG. 5, reference numeral 10 denotes a pipe assembly before being sent to the processing head 2, and reference numeral 20 denotes a fin tube after the processing. As shown in FIG. 3, the tube assembly 10 includes a fin tube 11 and a tube 12 inserted therein.

As the fin tube 11, a tube having a uniform thickness is used, and the fin tube 11 is fed into the processing head 2 at a predetermined speed with the tube 12 inserted therein. The roll processing machine roll-forms the fin tube by a special rolling roll built in the processing head 2 and extrudes the fin tube as a fin. Therefore, according to this manufacturing method, a seamless fin tube 20 in which the fins and the tube are integrated can be manufactured, but there are problems as described below.

[0004]

For example, in a partial condenser tube or the like, the heat transfer area of the fin tube needs to be changed because the temperature is different for each cooling section, so that the fin tube whose fin outer diameter changes. Is required.
However, in the case of the fin tube manufactured by the conventional manufacturing method, the fin outer diameters are uniform, so that a plurality of fin tubes having different fin outer diameters must be prepared, cut into appropriate lengths and connected. There is a problem that the production is troublesome and a seam is formed, which limits the use conditions.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art. Therefore, a fin tube having a different fin outer diameter can be manufactured seamlessly and easily and quickly. It is to provide a manufacturing method.

[0006]

SUMMARY OF THE INVENTION A feature of the method for manufacturing a fin tube according to the present invention is that a fin is formed in a manufacturing method in which a fin is roll-formed from a fin tube and the fin is closely attached to a tube inside the fin tube. In the previous step, the intended longitudinal section of the fin tube is machined to a predetermined thickness by means of a tube thickness adjusting roll, and then fins are formed from the fin tube so adjusted in thickness. is there.

[0007]

Therefore, in this manufacturing method, the thickness of the fin tube is adjusted before being formed into the fin, and the thickness of the fin tube is reduced in the area where the outer diameter of the fin is reduced.
When the fins are transformed into fins by a roll processing machine, the fin outer diameters differ according to the wall thickness of the fin tube, and a desired fin tube having a different fin outer diameter can be manufactured.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a fin tube according to the present invention will be described below with reference to the drawings. The feature of this manufacturing method is that before the fin is formed from the fin tube, the thickness of the fin tube is formed so as to have a predetermined value according to its longitudinal area, and thus the thickness is adjusted in advance. It is to include. Therefore, as shown in FIG. 1, in this roll processing machine, a pipe thickness adjusting roll is provided in front of the processing head 2.
The fin portion 3 is installed, where the thickness of the fin tube 11 is adjusted. As shown in FIG. 2, the adjusting roll section 3 includes a plurality of rolls 3 for adjusting the wall thickness of the pipe by moving in conjunction with each other.
a. It should be noted that the processing head 2 and the pipe thickness adjusting row
Since the file is known, the description of itself is omitted.

A fin is roll-formed from a fin tube 11 having a predetermined thickness in a predetermined longitudinal area of the tube thickness adjusting roll portion 3, and the fin is provided inside the fin tube. It is pressed against the tube 12 to make close contact. Since the height of the fins is determined by the thickness of the fin tube 11, a portion with a large thickness of the fin tube 11 becomes a relatively high fin and a portion with a small thickness becomes a relatively low fin.

Therefore, as shown in FIG. 3, a tube assembly 10 composed of a fin tube 11 having a uniform thickness and a tube 12 inserted therein has a thickness of the fin tube 11 at the adjusting roll portion 3. After being adjusted, the fin tube 11 is deformed into a fin by the processing head 2 and adhered to the tube 12, thereby producing a fin tube 20 having fins 22 and 23 having different heights as shown in FIG. Moreover, the fin tube 11 and the tube 1
Since 2 is used continuously, the fin tube 2 is used.
For 0, continuous ones are molded.

In one example, if the fin height F1 of the relatively high fin 22 and the fin height F2 of the low fin 23 in FIG. 4 and the wall thicknesses of the fin tubes 11 corresponding thereto are t1 and t2, respectively, t1 The original thickness of the fin tube is used, and the thickness of the fin tube deformed into the fin 23 is adjusted to t2 by rolling. In a specific example, t1 = 5.65 mm and t2 = 4.5 m
m, the height of the fin is F1 = 13 mm, F2 =
11.75 mm.

In the above embodiment, a pipe thickness adjusting roll 3 is provided adjacent to the processing head 2 of the roll processing machine and in front of the processing head 2, and immediately before the fin pipe is transformed into a fin, the thickness of the fin pipe is changed. Thickness adjustment is performed. With this configuration, the molding process can be made compact, the heating energy at the time of molding can be reduced, and the problem of runout due to centrifugal force can be avoided. Although there is an advantage, in some cases, the wall thickness of the fin tube may be adjusted at a position different from the roll processing machine.

[0013]

As described above, according to the method for manufacturing a fin tube according to the present invention, a seamless fin tube having different fin outer diameters is formed by forming fins from fin tubes whose wall thickness has been adjusted. Can be easily and quickly manufactured. Therefore, it is possible to realize a high-quality special-purpose fin tube which is not restricted by use conditions.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of an apparatus used for a method of manufacturing a fin tube according to the present invention.

FIG. 2 is a side view showing an operation state of a main part of the device shown in FIG.

FIG. 3 is a partial cross-sectional side view of a tube assembly used as a material of a fin tube.

FIG. 4 is a side view showing an example of a fin tube manufactured according to the present invention.

FIG. 5 is a side view showing an example of an apparatus used for manufacturing a conventional fin tube.

[Explanation of symbols]

 2 Fin processing head 3 Pipe thickness adjusting roll part 11 Fin pipe 12 Pipe 20 Fin tube 22 Fin 23 Fin

Claims (1)

(57) [Claims] 1. A method of manufacturing a fin tube in which a fin tube is roll-formed into a fin by a roll processing machine and at the same time, is brought into close contact with a tube inside the fin tube. A method for manufacturing a fin tube, comprising processing a predetermined longitudinal section to a predetermined thickness by a pipe thickness adjusting roll, and forming fins from the fin tube whose thickness has been adjusted.