Pipe with grooved inner surface for heat exchanger, and process for producing same
A manufacturing method and technology of heat exchangers, applied in heat exchange equipment, lighting and heating equipment, etc., can solve problems such as flattening of bending parts, breakage, damage to the value of appearance quality, etc., and achieve the effect of excellent bending processability
Inactive Publication Date: 2017-08-29
FURUKAWA SKY ALUMINUM CORP +1
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Specifically, when thinning is carried out until the ratio of the wall thickness to the outer diameter (t / D) is 0.04 or less, when the hairpin bending pitch is small and the hairpin bending is carried out under strict hairpin bending conditions, there is the following problem: Creases appear on the inner part, or the curved part is flat, or the value of the appearance quality is significantly damaged, and in extreme cases, it breaks
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0075] Hereinafter, an example of a copper pipe with inner grooves will be shown.
[0076] (1) An ingot having the chemical composition shown in Table 1 was melted and cast to prepare a billet for hot extrusion. (2) Heating the steel slab above, and performing hot extrusion at 850° C. to obtain an extruded tube blank. Next, the hot extruded extruded tube is extruded in water and quenched.
[0077] ·Pierce with an inner diameter of about 75mm by thermal processing before extrusion.
[0078] ·The outer diameter of the extruded tube billet is 102mm and the inner diameter is 75mm.
[0079] (3) The above-mentioned extruded tube blank is cold-rolled by a pilger mill rolling machine to obtain a rolled tube blank.
[0080] ·The outer diameter of the rolled billet is 46mm and the inner diameter is 39.8mm.
[0081] - The working degree (area reduction rate) in cold rolling was 88.9%.
[0082] Section reduction rate (%) = ((cross-sectional area before processing - cross-sectional ar...
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Abstract
The present invention is a pipe which is constituted of a copper alloy and has a grooved inner surface and which is for use in heat exchangers. The pipe is characterized in that the copper alloy contains 0.004-0.040 mass% P, with the remainder comprising Cu and unavoidable impurities, and that the recrystallographic texture of the copper alloy has a Goss-orientation density which is greater than 0 but not greater than 3.2. Furthermore, the present invention is a process for producing the pipe which has the grooved inner surface and which is for use in heat exchangers, the process being characterized in that a casting step, hot extrusion, cold working, intermediate heat treatment, rolling, and final heat treatment are conducted in this order or a casting step, cold working, intermediate heat treatment, rolling, and final heat treatment are conducted in this order, that in the casting step, a copper alloy containing 0.004-0.040 mass% P, with the remainder comprising Cu and unavoidable impurities, is cast, and that the reduction in outer diameter through working from the intermediate heat treatment to the final heat treatment is 6-16%. According to the present invention, it is possible to provide a pipe which has the grooved inner surface and which is for use in heat exchangers, the pipe having excellent bendability.
Description
technical field [0001] The present invention relates to an inner grooved tube excellent in workability for use as a heat transfer tube of cross-fin heat exchangers such as air conditioners and heat pump water heaters (Ecocute). Background technique [0002] Traditionally, seamless copper tubes have been mostly used for heat transfer tubes or refrigerant piping in heat exchangers for air conditioners such as indoor air conditioners and box-type air conditioners. Balanced phosphorus deoxidized copper tube (JIS H3300C1220T). [0003] These heat exchangers are mainly composed of copper tubes (hereinafter, inner grooved tubes) with spirally grooved inner surfaces, and fins (hereinafter, aluminum fins) made of aluminum or aluminum alloy plates. Specifically, for the heat transfer part of the heat exchanger, a U-shaped copper tube that was bent (hereinafter, hairpin bending) was passed through the through hole of the aluminum fin, and a jig was inserted into the hairpin bent coppe...
Claims
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IPC IPC(8): C22C9/00B21C37/20B21D53/06C22C9/05C22F1/08F28F21/08C22F1/00
CPCB21C37/20B21D53/06C22C9/00C22C9/05C22F1/00C22F1/08F28F21/08
Inventor 玉川博一小平正明
Owner FURUKAWA SKY ALUMINUM CORP