JPH081264A - Production of rotary heat transfer fin - Google Patents

Abstract

PURPOSE:To miniaturize an apparatus, to lighten the weight and to improve the productivity by making two rolls buried with forming tools on the circumference as one set, rotating them and machining a heat transfer fin. CONSTITUTION:A sheet as a material 17 of a heat transfer fin is produced with collar holes by pressing. The material produced with the collar holes is fed to a slit forming process through a feeding mechanism. The slit forming process executes forming of a cut-standing part and a lower part. The slit forming process executes forming by rotating roll forming tools 20, 20 and engaging the upper and lower tools. The slit forming tools are laminated with forming blades of 14 sheets on each upper and lower, execute cutting while engaging the upper and lower following the rotation of the roll 20 and execute forming along the shape of each forming blade. In a next cutting step, it is cut into a prescribed dimension, and the cut heat transfer fin 22 is piled with a stacking device 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing heat transfer fins for heat exchangers, and more particularly to a method for manufacturing heat transfer fins for heat exchangers used in refrigeration and air conditioning equipment.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a heat transfer fin for a heat exchanger has various fin fins which are insertion portions of a heat transfer tube, and between fin collars for the purpose of improving heat transfer performance of the heat exchanger. It is formed with a plurality of cut-and-raised parts that have been devised. The heat transfer fin manufacturing method includes a fin collar forming process, a cut-and-raised part forming process, and a cutting process for adjusting the fins to a required product size, and all of these processes are performed by pressing with an integrated die.

As an example of a method for manufacturing a heat transfer fin, Japanese Patent Application No.
-340561 is available.

[0004]

In the method of manufacturing the heat transfer fin for the heat exchanger according to the prior art, all the steps are integrated by pressing with a die. In addition, in order to improve the production efficiency, a large number of heat transfer fin forming tools are arranged in parallel so that the mold can be formed in multiple rows at the same time. Therefore, the weight of the mold tends to increase, and the processing speed is limited due to the ability of the press.

An object of the present invention is to provide a method for manufacturing heat transfer fins, which improves the processing speed.

[0006]

In order to achieve the above object, the present invention is to form a heat transfer fin by rotating a set of two rolls having a molding tool embedded in the circumference thereof. Characterize.

Further, a part of the heat transfer fin is processed by the above method.

[0008]

In the method of manufacturing the heat transfer fins by rotating a pair of rolls each having a forming tool embedded on the circumference, the processing efficiency is determined by the rotation speed of the rolls, and the heat transfer fins are produced by a method as compared with the conventional press processing. The processing efficiency can be easily improved.

Regarding the manufacturing method in which the press working and the working by the roll are used together, the diameter of the roll can be further reduced and the roll rotation speed can be increased as compared with the above-mentioned manufacturing method.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

A perspective view of a heat transfer fin for a heat exchanger manufactured according to an embodiment of the present invention is shown in FIG. The heat transfer fin is composed of a collar hole that is the insertion part of the heat transfer tube, a cut-and-raised part in the center, and louver parts at both ends.

FIG. 2 is a schematic view of a heat transfer fin manufacturing apparatus. Collar holes are made in the thin plate, which is the material of the heat transfer fins, by pressing. The material for which the color holes have been manufactured is sent to the slit forming step, which is the next step, through the feeding mechanism. In the slit forming process, the cut and raised portion and the louver portion are formed. In the slit forming process, a roll forming tool rotates and meshes vertically to perform forming.

FIG. 3 shows a sectional shape of the slit forming tool. The slit forming tool has 14 upper and lower forming blades stacked, and cuts while meshing with each other in accordance with the rotation of the roll, and performs forming according to the shape of each forming blade. This forming tool is a set of 14 sheets each for the upper and lower sides, but by further stacking, a plurality of heat transfer fins of the same shape can be manufactured at the same time, and the productivity is also improved. In this case, it is cut into a predetermined size in the next cutting step. The cut heat transfer fins are stacked by a stacking device.

[0014]

According to the present invention, by using the forming tool of the rotary type roll, the equipment can be downsized as compared with the conventional forming die.
Weight can be reduced and productivity can be improved easily.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat transfer fin for a heat exchanger manufactured according to an embodiment of the present invention.

FIG. 2 is a side view of a heat transfer fin manufacturing apparatus according to an embodiment of the present invention.

FIG. 3 is a sectional view of the heat transfer slit forming tool.

FIG. 4 is a side view of a conventional heat transfer fin manufacturing apparatus.

[Explanation of symbols]

7-1, 7-2, 8-1, 8-2, 9-1, 9-2, 1
0-1, 10-2 ... Cut and raised portion, 11 ... Fin substrate,
12 ... Fin collar, 15 ... Louver part, 16 ... Heat transfer fin material coil, 17 ... Heat transfer fin material, 18 ... Color hole drilling mold, 19 ... Color hole drilling press, 20 ... Laminating roll tool, 21 ... Cutting device, 22 ... Heat transfer fin, 23
… Stacking device, 24… Cross section of laminated roll tool, 2
5 ... Conventional heat transfer fin manufacturing die, 26 ... Conventional heat transfer fin manufacturing press.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Teiyasu Kira 390 Muramatsu, Shimizu City, Shizuoka Prefecture Hitachi Ltd. Air Conditioning Systems Division

Claims (1)

[Claims] 1. A method for manufacturing a heat transfer fin for a heat exchanger, characterized in that a thin plate is processed by simultaneously rotating two rolls having a molding tool embedded on the circumference thereof. Production method.