JPH0639432A - Manufacture of fin tube - Google Patents

Abstract

PURPOSE:To easily and quickly manufacture a seamless and continuous fin tube having fins with different outer diameters by forming fins from a fin tube whose thickness is adjusted. CONSTITUTION:A fin is formed by rolling a fin tube 11 having a prescribed thickness on a predetermined area in the longitudinal direction in a roll part 3 for adjusting tube wall thickness, and the fin is pressed and adhered to a tube 12 provided inside the fin. Consequently, a tube assembly 10, which is constituted of a fin tube 11 with a unified thickness and the tube 12 that is inserted into the inside of the fin tube 11, is provided with the fin tube whose thickness of the fin is adjusted by the adjusting roll 3. Then, the fin tube 11 is transformed into a fin by a working head 2, adhered to the tube 12, and the fin tube 20 with fins with different heights is produced. Also, since a continuous tube is used for the fin tube 11 and the tube 12, the fin tube 20 formed is a continuous one.

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 with a roll processing 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 manufacturing fin tubes, in which 1 is a mount of the processing machine and 2 is a processing head. Further, in FIG. 5, reference numeral 10 indicates a pipe assembly before being fed to the machining head 2, and reference numeral 20 indicates a fin tube after machining. As shown in FIG. 3, the pipe assembly 10 is composed of a fin pipe 11 and a pipe 12 inserted inside the fin pipe 11.

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

[0004]

For example, in a partial condensing pipe or the like, the heat transfer area of the fin tube needs to be changed because the temperature differs for each cooling section, and therefore the fin tube having a different fin outer diameter is required. Is required.
However, since the fin tube manufactured by the conventional manufacturing method has a uniform fin outer diameter, it is necessary to prepare a plurality of fin tubes having different fin outer diameters, cut them to an appropriate length, and connect them. Since it takes time and effort to manufacture and a seam is formed, there is a problem that it is limited by the usage conditions.

An object of the present invention is to solve the above-mentioned problems of the prior art. Therefore, a fin tube capable of easily and quickly manufacturing fin tubes having different fin outer diameters. It is to provide a manufacturing method.

[0006]

The feature of the manufacturing method of the fin tube according to the present invention is that the fin is formed in the manufacturing method in which the fin is roll-formed from the fin tube and the fin is closely adhered to the inner tube of the fin tube. In the previous step, the tube wall thickness adjusting roll was used to machine a predetermined longitudinal area of the fin tube to a predetermined wall thickness, and then the fin tube was formed from the fin tube thus adjusted in thickness. is there.

[0007]

Therefore, in this manufacturing method, the wall thickness of the fin tube is adjusted before the fin tube is formed, and the wall thickness of the fin tube is reduced in the area where the outer diameter of the fin is reduced.
When deformed into fins by a roll processing machine, the fin outer diameter differs depending on the wall thickness of the fin tube, and it is possible to manufacture a desired fin tube having a different fin outer diameter.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fin tube manufacturing method according to the present invention will now be described with reference to the drawings. The feature of this manufacturing method is that before the fin is formed from the fin tube, the step of forming the thickness of the fin tube to a predetermined value according to the region in the longitudinal direction, and thus adjusting the thickness in advance. It is to include. Therefore, as shown in FIG. 1, in this roll processing machine, a pipe wall thickness adjusting roll is provided in front of the processing head 2.
The wall portion 3 is installed, and the wall thickness of the fin tube 11 is adjusted there. As shown in FIG. 2, the adjusting roll portion 3 is provided with a plurality of rolls 3 for adjusting the wall thickness of the pipe by interlocking movements.
Including a. The processing head 2 and the pipe wall thickness adjusting roll
The description of itself is omitted because it is already known.

A fin is roll-formed from a fin tube 11 having a predetermined wall thickness in a predetermined longitudinal area in the tube wall thickness adjusting roll 3, and the fin is provided inside the fin. It is pressed against the tube 12 so that it adheres closely. Since the height of the fins is determined by the wall thickness of the fin tube 11, the portion of the fin tube 11 where the wall thickness is large is a relatively high fin and the portion where the wall thickness is small is a relatively low fin.

Therefore, as shown in FIG. 3, the fin assembly 11 including the fin tube 11 having a uniform wall thickness and the tube 12 inserted inside the fin tube 11 has the wall thickness of the fin tube 11 in the adjusting roll portion 3. The fin tube 11 is adjusted, and then the fin tube 11 is deformed into fins by the processing head 2 to be closely attached to the tube 12, and as shown in FIG. 4, a fin tube 20 having fins 22 and 23 having different heights is manufactured. Moreover, the fin tube 11 and the tube 1
2 is a continuous tube, so the fin tube 2
For 0, continuous ones are molded.

As an example, in FIG. 4, if the fin height dimension F1 of the fin 22 is relatively high and the fin height dimension F2 of the low fin 23 is set, and the wall thicknesses of the fin tube 11 corresponding thereto are t1 and t2, respectively, t1 The original wall thickness of the fin tube is used as the thickness of the fin tube. Therefore, the wall thickness of the portion of the fin tube that is deformed into the fin 23 is adjusted to t2 by rolling. In a specific example, t1 = 5.65 mm, t2 = 4.5 m
When m is set, the fin height is F1 = 13 mm, F2 =
It will be 11.75 mm.

In the above-described embodiment, the pipe wall thickness adjusting roll 3 is installed adjacent to the processing head 2 of the roll processing machine on the front side thereof, and the fin pipe meat is formed immediately before the fin pipe is transformed into fins. The thickness is adjusted, and if configured in this way, the molding process can be made compact and the heating energy at the time of molding can be saved, and the problem of runout due to centrifugal force can be avoided. Although there is an advantage, the thickness of the fin tube may be adjusted at a position different from that of the roll processing machine depending on the case.

[0013]

As described above, according to the method of manufacturing a fin tube according to the present invention, a fin tube is formed from a fin tube whose wall thickness is adjusted to form a continuous fin tube having different fin outer diameters. Can be manufactured easily and quickly. Therefore, it is possible to realize a high quality fin tube for special applications which is not restricted by the use conditions.

[Brief description of drawings]

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

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

FIG. 3 is a partial cross-sectional side view of a tube assembly that is a material for the 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 Tube wall thickness adjusting roll section 11 Fin tube 12 Tube 20 Fin tube 22 Fin 23 Fin

Claims (1)

[Claims] 1. A method of manufacturing a fin tube in which a fin tube is roll-formed into a fin by a rolling machine and is closely adhered to an inner tube of the fin tube, wherein the fin tube is formed before the fin tube is formed from the fin tube. A method for manufacturing a fin tube, characterized in that a predetermined longitudinal section is processed into a predetermined wall thickness by a tube wall thickness adjusting roll, and a fin is formed from the fin tube whose wall thickness is adjusted.