JP2007260769A - Method for manufacturing side material, method for manufacturing clad material for heat exchanger, and clad material for heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a side material used for a clad material which is employed in a heat exchanger and excellent in productivity and corrosion resistance, whose side material member is easy to control its surface condition and flatness, and in which adhesion failure is hard to occur, to provide a method for manufacturing a clad material employed in a heat exchanger, and to provide a clad material employed in a heat exchanger. <P>SOLUTION: In a method for manufacturing a side material used for a clad material, which is employed in a heat exchanger and consists of a core material and side materials forming one or more layers superimposed on one or both sides of the core material, at least one layer of the side materials is made of a metal having a constituent composition different from that of the core material. The method includes a melting step of melting a metal for side material, a casting step of casting the metal melted in the melting step to make an ingot for side material, and a slicing step of slicing the ingot to a predetermined thickness, which steps are performed in this order. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a clad material, in particular, a method for producing a side material used in a clad material for a heat exchanger (brazing sheet) used in a heat exchanger of an automobile or the like, a method for producing a clad material for a heat exchanger, and a clad for a heat exchanger Regarding materials.

Generally, a clad material for a heat exchanger used for an intercooler, an oil cooler, a radiator, a condenser, an evaporator, a heater core or the like for an automobile is used by rolling a side material.
For example, Patent Document 1 describes a conventional method for producing a conventional clad material for a heat exchanger as follows. First, an aluminum alloy for a core material and an aluminum alloy for a side material (a sacrificial anode material and a brazing material in Patent Document 1) are melted and cast by continuous casting, and subjected to a homogenization heat treatment as necessary. The ingots of the side material aluminum alloy are each hot-rolled to a predetermined thickness (see S11a and S11b in FIG. 6, and the homogenization heat treatment is described as soaking). Next, the aluminum alloy ingot for the core material (core material) and the hot rolled plate for the side material (side material) are overlapped (see S12 in FIG. 6), and hot rolled (clad hot rolling, FIG. 6 (see S13).
Japanese Patent Laying-Open No. 2005-232507 (paragraphs 0037, 0039, 0040)

However, such a conventional general clad material manufacturing method has the following problems.
(1) Since a hot-rolled sheet is used as the side material, there are many manufacturing processes for the clad material, and the number of hot rolling operations is increased, resulting in a decrease in productivity.

  (2) The core ingot is often chamfered by a milling machine or the like, and its surface is a chamfered surface. On the other hand, the hot rolled sheet for a side material is a roll processed surface on which rolling marks generated along the rolling direction are formed. Therefore, the ingot for the core material and the hot-rolled sheet for the side material have different surface states, and when the two are overlapped and clad hot rolled, the adhesion between the core material and the side material is likely to occur. There was a problem. And in order to improve the adhesiveness of a core material and a side material, the multipass rolling under a light pressure is needed in a clad hot rolling, and the productivity in a clad hot rolling will fall.

  (3) When a hot rolled sheet is used as a side material, the surface state and flatness of the rolled sheet (particularly the flatness in the longitudinal direction) are controlled only by the rolling roll. Since a thick oxide film is formed on the surface, it is difficult to control the surface state and flatness, and there is a problem that poor adhesion between the core material and the side material cannot be prevented.

  (4) The quality that when a poor adhesion between the core material and the side material occurs, the productivity of the clad material decreases, the problem that the predetermined clad rate cannot be obtained, and the quality abnormality such as blistering occurs. The problem of a reduction | decrease and also the problem that corrosion resistance falls by adhesion failure occur also.

  The present invention has been made in view of the above problems, and its purpose is excellent in productivity, easy control of the surface state and flatness of the side material, less likely to cause poor adhesion, and excellent in corrosion resistance. An object of the present invention is to provide a method for producing a side material used for a clad material for an exchanger, a method for producing a clad material for a heat exchanger, and a clad material for a heat exchanger.

  In order to solve the above-mentioned problem, the method for producing a side material according to claim 1 is characterized in that the side material used for a clad material for a heat exchanger comprising a core material and one or more side materials superimposed on one or both sides thereof. The at least one layer of the side material is a metal for a side material having a component composition different from that of the core material, and is dissolved in the melting step for dissolving the metal for the side material, and the melting step. A casting process for producing a side material ingot by casting the side material metal and a slicing process for slicing the side material ingot to a predetermined thickness are performed in this order.

  According to such a manufacturing method, since the sliced side material is used as the side material member, it is not necessary to reduce the thickness of the side material member by hot rolling as in the conventional clad material. As a result, the number of hot rolling operations can be reduced as compared with the prior art, the work process can be omitted, the surface state and the flatness can be easily controlled, and the oxide film thickness is reduced.

The method for manufacturing a side material according to claim 2 is characterized in that, in the slicing step, the ingot for side material is sliced in parallel with the installation surface of the ingot for side material installed horizontally. .
According to such a manufacturing method, the influence of the weight of the cut lump (slice lump) generated during slicing and displacement due to the shape (for example, the force that the cut lump tries to collapse) is minimized, and the sliced side The flatness of the material is improved, and the adhesion with the core material is improved. In addition, the crimping performance is improved and the number of crimping passes is reduced.

The method for manufacturing a side material according to claim 3 is characterized in that a homogenized heat treatment is further performed on the cast side material ingot after the casting step and before the slicing step.
According to such a manufacturing method, the internal stress of the side material ingot is removed, the flatness of the sliced side material is improved, and the adhesion with the core material is improved. In addition, the crimping performance is improved and the number of crimping passes is reduced.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a side material, wherein after the slicing step, a surface smoothing process is further performed on the surface of the sliced side material having a predetermined thickness.
According to such a manufacturing method, the surface state and flatness of the side material are improved, and the adhesion with the core material is improved. In addition, the crimping performance is improved and the number of crimping passes is reduced.

The side material manufacturing method according to claim 5 is characterized in that the surface smoothing treatment is performed by one or more methods selected from a cutting method, a grinding method and a polishing method.
According to such a manufacturing method, the surface state and flatness of the side material are improved, and the adhesion with the core material is improved. In addition, the crimping performance is improved and the number of crimping passes is reduced.

The method for producing a side material according to claim 6 is characterized in that at least one layer of the side material has a flatness of 1 mm or less per 1 m in the longitudinal direction.
According to such a manufacturing method, by controlling the flatness to a predetermined value or less, the flatness is further improved and the adhesion with the core material is further improved. In addition, the crimping performance is further improved, and the number of crimping passes is reduced.

The method for producing a side material according to claim 7 is characterized in that at least one layer of the side material has a surface roughness in a range of 0.05 to 1.0 μm in terms of arithmetic average roughness (Ra).
According to such a manufacturing method, it is difficult to form a gap between the core material and each side material, and adhesion and pressure-bonding properties are further improved.

The method for manufacturing a side material according to claim 8 is characterized in that at least one layer of the side material has a thickness of 10 to 250 mm.
According to such a manufacturing method, the clad rate of the heat exchanger clad material is appropriately adjusted by defining the thickness of the side material within a specific range.

  The manufacturing method of the clad material for heat exchangers according to claim 9 includes a preparation step of preparing a side material manufactured by the manufacturing method described above and a core material for superposing the side material, the core material, and the core material A superposition process for manufacturing a superposition material by superposing side materials in a predetermined arrangement, a homogenization heat treatment process for subjecting the superposition material to a homogenization heat treatment, and a hot for performing hot rolling after the homogenization heat treatment process It includes a rolling process and a cold rolling process in which cold rolling is performed after the hot rolling process.

  According to such a manufacturing method, since the surface state and flatness of the side material can be easily controlled, adhesion and pressure-bonding properties are improved when the side material is superimposed on the core material. Therefore, the number of crimping passes can be reduced in the hot rolling process, and the yield and productivity are improved. Moreover, since a gap is not easily formed between the core material and each side material, the corrosion resistance is improved.

The clad material for a heat exchanger according to claim 10 is manufactured by the above manufacturing method.
According to such a clad material for a heat exchanger, the adhesion and pressure-bonding property between the core material and each side material are improved, and a gap is not easily formed between the core material and each side material, so that the corrosion resistance is improved. improves.

  According to the manufacturing method of the side material according to claim 1 of the present invention, since the sliced side material is used as the side material member, the thickness of the side material member is reduced by hot rolling like a conventional clad material. There is no need to reduce the number, and the number of hot rolling operations can be reduced as compared with the conventional case, and the work process can be omitted. Further, the surface condition and flatness can be easily controlled, the thickness of the oxide film is reduced, adhesion failure is unlikely to occur, and a clad material for heat exchanger having excellent corrosion resistance can be manufactured.

  According to the method for manufacturing a side material according to claim 2, a side material with improved flatness can be obtained, and adhesion and pressure-bonding properties with the core material are further improved. . According to the method for manufacturing a side material according to claim 3, the flatness of the sliced side material is further improved by performing the homogenization heat treatment on the ingot for side material, so that poor adhesion is less likely to occur.

  In the method for manufacturing a side material according to claim 4 or claim 5, since the side material is subjected to a surface smoothing process, adhesion failure is less likely to occur.

  In the method for manufacturing the side material according to the sixth aspect, by controlling the flatness, the adhesion to the core material and the pressure-bonding property are further improved, so that the adhesion failure is less likely to occur. In the side material manufacturing method according to the seventh aspect, a gap is hardly formed between the core material and each side material, and adhesion and pressure-bonding properties are further improved. In the method for manufacturing the side material according to the eighth aspect, since the thickness of the side material is specified, a clad material for a heat exchanger having an appropriate cladding rate can be manufactured.

  In the manufacturing method of the clad material for heat exchanger according to claim 9, since the side material manufactured by the above method is used as the side material member, it becomes easy to control the surface state and flatness of the side material member, It is possible to produce a clad material for heat exchanger that is less likely to cause poor adhesion and has excellent corrosion resistance. Moreover, the cladding material for heat exchangers with low manufacturing cost can be manufactured.

  In the clad material for a heat exchanger according to claim 10, the adhesion and pressure-bonding properties between the core material and each side material are improved, and a gap is not easily formed between the core material and each side material. Can be improved.

  Next, a method for manufacturing a side material according to the present invention and a method for manufacturing a clad material for a heat exchanger using the side material will be described in detail with reference to the drawings. In the drawings to be referred to, FIG. 1 (a) and FIG. 1 (b) are diagrams showing a flow of a manufacturing method of a clad material for heat exchanger, and FIG. 2 is a cross-sectional view showing the configuration of the clad material for heat exchanger, FIG. 3 is a schematic diagram showing an outline of a side material casting process or a core material casting process, FIGS. 4A and 4B are schematic diagrams showing an outline of a side material slicing method, and FIG. 5A. FIG. 5 is a schematic diagram showing a configuration of a laminated material, and FIG. 5B is a schematic diagram showing an outline of a hot rolling process.

≪Side material manufacturing method (side material manufacturing process) ≫
As shown in FIG. 1, the side material manufacturing method includes a side material manufacturing step S1a for manufacturing one or more side materials superimposed on one or both sides of a core material used for a clad material for a heat exchanger. is there.
In this side material manufacturing step S1a, first, a side material having a component composition different from that of the core material is melted, and the side material metal melted in this melting step is cast to form a side material ingot. And a slicing step of slicing the ingot for the side material into a predetermined thickness to form at least one layer of the side material.
If necessary, a homogenization heat treatment described later may be performed after the casting process, and a surface smoothing process (face cutting in FIG. 1) described later may be performed after the slicing process.

<Configuration of clad material>
The side material is used for a clad material for a heat exchanger composed of a core material and one or more side materials laminated on one or both sides thereof, and the number of layers of the side material of the clad material for the heat exchanger is not limited. There is no limit. For example, as shown in FIG. 2A, a two-layer clad material 1a for a heat exchanger in which one brazing material 3 is clad on one side of the core material 2, and as shown in FIG. 3 layers of heat exchanger clad material 1b clad with brazing material 3 on each side, brazing material 3 on one side of core material 2 and sacrifice on the other surface of core material 2 as shown in FIG. A three-layer clad material 1c clad with the material 4 one by one, and for a three-layer heat exchanger clad with the intermediate material 5 and the brazing material 3 on one side of the core material 2 as shown in FIG. Clad material 1d, as shown in FIG. 2 (e), a four-layer clad material for a heat exchanger in which an intermediate material 5 and a brazing material 3 are clad on one side of a core material 2 and a sacrificial material 4 is clad on the other surface of the core material 2. 1e, as shown in FIG. 2 (f), a five-layer clad material 1f for a heat exchanger in which an intermediate material 5 and a brazing material 3 are clad on both surfaces of the core material 2 are listed. It is possible.
However, although not shown, it is needless to say that the present invention can also be suitably applied to a cladding material for heat exchangers of six layers or more in which the number of side members (brazing material, sacrificial material, intermediate material) is further increased. Absent.

(Dissolution process)
In the melting step, the side metal having a different component composition from that of the core is melted.
When the clad materials 1a to 1f for heat exchangers are provided with a brazing material as the side material metal, a 4000 series Al—Si based aluminum alloy can be used for the brazing material. Here, the Al—Si based alloy includes an alloy containing Zn in addition to Si. As the Al—Si based alloy, for example, Al-7 to 13 mass% Si based alloy or Al-7 to 13 mass% Si-2 to 7 mass% Zn based alloy can be used. However, any alloy that can be used as a brazing material can be applied.

  When the clad materials 1c and 1e for the heat exchanger are provided with a sacrificial material as the side material metal, a 3000-based Al—Mn-based aluminum alloy or a 7000-based Al—Zn—Mg-based aluminum alloy is used as the sacrificial material. In addition, an Al—Zn alloy can be used. Here, the Al—Zn-based alloy includes an alloy containing Mn and Si in addition to Zn. Examples of Al-Zn alloys include Al-1 to 7 mass% Zn-based alloys, Al-0.5 to 1.2 mass% Mn-0.5 to 1.2 mass% Si-2 to 6 mass%, A Zn-based alloy, Al-0.8 to 1.2 mass% Si-2 to 6 mass% Zn-based alloy can be used, but is not limited to these, and any alloy can be used as a sacrificial material. All can be applied.

As the side metal, when the heat exchanger clad materials 1d to 1f are provided with an intermediate material, 1000 series pure aluminum or 7000 series Al-Zn-Mg aluminum alloy can be used for the intermediate material. Furthermore, an Al—Mn alloy can be used. Here, the Al—Mn alloy includes alloys containing Cu, Si, and Ti in addition to Mn. Examples of the Al-Mn alloy include Al-0.5 to 1.2 mass% Mn-0.5 to 1.2 mass% Cu-0.5 to 1.2 mass% Si-based alloy, Al-0. Although 5 to 1.2 mass% Mn-0.5 to 1.2 mass% Cu-0.5 to 1.2 mass% Si-0.05 to 0.3 mass% Ti-based alloy can be used. However, the present invention is not limited to these, and any alloy that can be used as an intermediate material can be applied.
The adjustment of the component composition of the metal can be appropriately determined according to the use of the clad material for heat exchanger to be used.

(Casting process)
As a casting method, a semi-continuous casting method can be used.
In the semi-continuous casting method, a casting apparatus 10 as shown in FIG. 3 is used, and a molten metal M (here, a metal for a side material) is poured from above into a metal water-cooled mold 11 having an open bottom, the metal solidifies from the bottom of the water-cooled mold 11 is continuously taken out to thereby obtain a ingot for side material 17 having a predetermined thickness T _1. At this time, the molten metal M is supplied from the trough 12 to the water-cooled mold 11 through the nozzle 13, the float 14 and the glass screen 15. The molten metal M supplied to the water-cooled mold 11 is solidified by being in contact with the inner wall surface of the water-cooled mold 11 cooled by the cooling water W to become a solidified shell 16. Further, the cooling water W is directly sprayed from the lower part of the water-cooled mold 11 onto the surface of the solidified shell 16 to continuously produce the side material ingot 17.

Here, the thickness T ₁ of the side material ingot 17 is preferably 200 to 700 mm. Moreover, although the width | variety and length of the ingot 17 for side materials are not specifically limited, When productivity is considered, width 1000-2500mm and length are 3000-10000mm.
The semi-continuous casting method may be performed either vertically or horizontally.

(Slicing process)
As the slicing method, a slab slicing method can be used.
In the slab slicing method, as shown in FIG. 4A, the side material ingot 17 manufactured by the semi-continuous casting method is sliced by a band saw cutter or the like (not shown), so that the predetermined thickness T ₂ is obtained. Side material 35 is manufactured. Here, the thickness _{T 2} of the side member 35, 10 to 250 mm is preferable. If the _second thickness T ₂ is outside the range, the clad ratio of the clad member for heat exchanger is liable to be inappropriate. Moreover, as shown in FIG.4 (b), it is preferable to slice the ingot 17 for side materials in parallel with respect to the installation surface 35a of the said ingot for side materials installed horizontally.
Here, the installation surface 35a is a surface in contact with the installation table of the slicing device for the side material ingot 17.
By doing so, the influence of the weight of the cut lump (slice lump) generated during slicing and the displacement due to the shape (for example, the force that causes the cut lump to collapse) is minimized, and the sliced side member 35 The flatness of the is further improved.
As a slicing method, it may be cut by a circular saw cutter, or may be cut by a laser or water pressure.

Further, as shown in FIG. 1 (b), internal stress is removed before the side material ingot 17 is appropriately sliced into the side material ingot 17 cast by the above casting method. Homogenization heat treatment may be performed.
By performing the homogenization heat treatment, the internal stress of the side material ingot 17 is removed, and the flatness of the sliced side material is further improved. Here, the temperature and time of the homogenization heat treatment are not particularly limited, but the treatment temperature is preferably 350 to 600 ° C. and the treatment time is preferably 1 to 10 hours.

  If the treatment temperature of the homogenization heat treatment is less than 350 ° C., the amount of internal stress removed is small, and the solute elements segregated during casting are not sufficiently homogenized, so that the effect of the heat treatment is small. On the other hand, when the processing temperature exceeds 600 ° C., a phenomenon called burning in which a part of the ingot surface is melted is likely to cause surface defects in the clad material for heat exchanger. If the treatment time is less than 1 hour, the effect of removing internal stress is small and homogenization tends to be insufficient. The processing time is preferably 10 hours or less in consideration of productivity.

The side material 35 manufactured by the above-described manufacturing method is subjected to a surface smoothing process (in FIG. 1) for removing crystallized substances and oxides formed on the surface, if necessary, before overlapping with the core material. (Chamfering) may be performed.
As the surface smoothing treatment method, a cutting method such as end mill cutting or diamond bite cutting, a grinding method in which the surface is ground with a grindstone, a polishing method such as buffing, or the like can be used, but it is not limited thereto. .

  Thus, by performing the slicing of the ingot 17 for the side material and the surface smoothing treatment, in the evaluation of flatness, the flatness per 1 m in the longitudinal direction is 1 mm or less, desirably 0.5 mm or less, and the surface roughness is A side material having an arithmetic average roughness (Ra) of 0.05 to 1.0 μm, preferably 0.1 to 0.7 μm can be obtained. If the flatness exceeds the above range, adhesion failure tends to occur in the heat exchanger clad material. If the surface roughness is less than the above range, wrinkles are likely to occur, and processing tends to be difficult. When the surface roughness exceeds the above range, adhesion failure is likely to occur in the heat exchanger clad material.

Moreover, by using such a side material 35, a CASS test (salt spray test: JIS Z 2371) is used as an external surface corrosion test for 1500 hours, and an immersion test (Na ⁺ : 118 ppm, Cl ⁻ : 58 ppm is used as an internal surface corrosion resistance test). _{^{, SO 4 2-: 60ppm, Cu}} 2+: 1ppm, Fe 3+: after 2000 hours at 30 ppm) 80 ° C., the corrosion depth after the test is clad member for heat exchanger to be 60μm or less.

  In addition, at least 1 layer of the side material 35 may be manufactured by the said manufacturing method, and the other layer may be manufactured by the conventional manufacturing method.

≪Clad material manufacturing process≫
As shown in FIG. 1, the manufacturing method of the clad material for heat exchanger according to the present invention is a preparatory process for preparing the side material manufactured by the above manufacturing method and the core material for overlapping the side material. A side material and a core material are manufactured by the side material manufacturing process S1a and the core material manufacturing process S1b. Thereafter, the core material and the side material are superposed in a predetermined arrangement in the superposition step S2 to obtain a superposition material, and the superposition material is subjected to homogenization heat treatment in the homogenization heat treatment step S3. Then, after the homogenization heat treatment step S3, the hot rolling is performed by the hot rolling step S4, and after the hot rolling step S4, the cold rolling is performed by the cold rolling step S5.

<Side material manufacturing process>
Since the side material manufacturing step S1a is as described above, it is omitted here.
<Core production process>
As shown in FIG. 1, the core material manufacturing process S1b includes a melting process for melting the core metal, and a casting process for manufacturing the core metal ingot by casting the core metal dissolved in the melting process. It was decided to include.
In addition, you may perform at least 1 of a surface smoothing process (facing of FIG. 1) and a homogenization heat processing as needed.

(Dissolution process)
In the melting step, the core metal having a different component composition from the side material is melted.
As the metal for the core material, a 2000 series Al-Cu series aluminum alloy, a 3000 series Al-Mn series aluminum alloy, a 5000 series Al-Mg series aluminum alloy, or the like can be used. However, any alloy that can be used as a core material can be applied.
The adjustment of the component composition of the metal can be appropriately determined according to the use of the clad material for heat exchanger to be used.

(Casting process)
As the casting method, the semi-continuous casting method described above can be used.
Here, the thickness T ₁ of the core material ingot for 25 (see FIG. 3) is, 200 to 700 mm is preferable. When the thickness T ₁ is out of the above range, the clad rate of the heat exchanger clad material tends to be inappropriate. Further, the width and length of the core material ingot 25 are not particularly limited, but considering the productivity, the width is preferably 1000 to 2500 mm and the length is preferably 3000 to 10000 mm.
Surface smoothing for removing crystallized substances and oxides formed on the surface of the ingot 25 for core material cast by the above casting method, if necessary, before overlapping with the side material 35 described above. At least one of a homogenization treatment and a homogenization heat treatment for removing internal stress may be performed.

  By performing the surface smoothing treatment, in the evaluation of flatness, the flatness per 1 m in the longitudinal direction is 1 mm or less, preferably 0.5 mm or less, and the surface roughness is 0.05 to 1 in terms of arithmetic average roughness (Ra). A core material having a thickness of 0.5 μm, preferably 0.1 to 0.7 μm can be obtained. If the flatness exceeds the above range, adhesion failure tends to occur in the heat exchanger clad material. If the surface roughness is less than the above range, wrinkles are likely to occur, and processing tends to be difficult. When the surface roughness exceeds the above range, adhesion failure is likely to occur in the heat exchanger clad material. Moreover, by performing the homogenization heat treatment, the internal stress of the core material ingot 25 is removed, and the flatness of the core material is further improved. Here, the temperature and time of the homogenization heat treatment are not particularly limited, but the treatment temperature is preferably 350 to 600 ° C. and the treatment time is preferably 1 to 10 hours.

  If the treatment temperature of the homogenization heat treatment is less than 350 ° C., the amount of internal stress removed is small, and the solute elements segregated during casting are not sufficiently homogenized, so that the effect of the heat treatment is small. On the other hand, when the processing temperature exceeds 600 ° C., a phenomenon called burning in which a part of the ingot surface is melted is likely to cause surface defects in the clad material for heat exchanger. If the treatment time is less than 1 hour, the effect of removing internal stress is small, and homogenization tends to be insufficient. The processing time is preferably 10 hours or less in consideration of productivity.

<Overlay process>
As shown in FIG. 5A, the superimposing step S2 is performed by cutting the leading end and the trailing end of the core material ingot 25 (see FIG. 3) manufactured in the above step to a predetermined length. One side member 35 or a plurality of side members (not shown) are superposed in a predetermined arrangement on one side or both sides (not shown) to form an overlapping member 40. Here, the predetermined arrangement is a clad material for a heat exchanger as a product, for example, a core material 2, a brazing material 3, a sacrificial material in the clad materials 1 a to 1 f for a heat exchanger as shown in FIGS. This means that it corresponds to the arrangement of the material 4 and the intermediate material 5. In addition, as a superimposing method, a conventionally known method, for example, a method of banding both ends of the core material 26 and the side material 35 is used. There is no problem even if a method such as welding is used in addition to the method of banding.
Each gap when overlapped is preferably within 10 mm at maximum, desirably within 5 mm.

<Homogenization heat treatment process>
The laminated material 40 thus manufactured is subjected to a homogenization heat treatment in order to make the internal structure uniform and to make it soft so that hot rolling can be easily performed (S3).

<Hot rolling process>
In the hot rolling step S4, as shown in FIG. 5B, the band of the overlapping material 40 is cut, and the overlapping material 40 is hot rolled to produce the clad material 1a for heat exchanger. Here, the hot rolling method is performed by a conventionally known rolling method. As the rolling mill to be used, the four-stage rolling mill 50 is described in FIG. 5B, but a two-stage rolling mill or a rolling mill having four or more stages (not shown) may be used. Further, in FIG. 5B, the four-stage rolling mill 50 provided with one row of roll stands is described. However, using a rolling mill provided with a plurality of rows of roll stands (not shown), heat of a predetermined thickness is used. You may repeat hot rolling until the clad material 1a for exchangers is obtained.

<Cold rolling process>
The clad material 1a for heat exchanger thus manufactured is then subjected to a cold rolling process (S5). As an example, the cold rolling treatment can be performed at a rolling reduction of 30 to 99%.

In addition, in order to impart desired mechanical properties as required, heat treatment (annealing treatment), distortion correction treatment, age hardening treatment, or the like is performed by a conventional method, or a predetermined shape is processed, or a predetermined shape is obtained. It may be cut into sizes. As an example, as annealing treatment, rough annealing performed before cold rolling, intermediate annealing performed during cold rolling, and final annealing performed after final cold rolling are performed at 200 to 500 ° C. × 0 to 10 hours in a continuous furnace or batch furnace. However, the present invention is not limited to these, and it goes without saying that the conditions can be appropriately changed as long as the effects (mechanical characteristics) obtained by these treatments are exhibited.
The clad material for heat exchangers according to the present invention is produced by each step of the method for producing the clad material for heat exchangers described above.

As described above, according to the side material manufacturing method, the heat exchanger clad material manufacturing method, and the heat exchanger clad material according to the present invention, the surface state and flatness of the side material can be easily controlled. Smoothness can be improved and the oxide film thickness can be reduced.
In addition, since the adhesiveness and the pressure bonding property are improved, the number of pressure bonding passes can be reduced, and the yield and productivity can be improved.
Furthermore, it is difficult to form a gap between the core material and each side material, and the corrosion resistance can be improved.

  As mentioned above, although the manufacturing method of the side material used for the cladding material for heat exchangers concerning the present invention, the manufacturing method of the cladding material for heat exchangers, and the cladding material for heat exchangers have been explained, the gist of the present invention is described in these descriptions. The present invention is not limited, and should be interpreted broadly based on the description of the scope of claims of the present application. It goes without saying that the technical scope of the present invention can be widely changed and modified without departing from the spirit of the present invention.

(A), (b) is a figure which shows the flow of the manufacturing method of the clad material for heat exchangers which concerns on this invention. (A)-(f) is sectional drawing which shows the structure of the clad material for heat exchangers which concerns on this invention. It is a schematic diagram which shows the outline of a side material casting process or a core material casting process. (A), (b) is a schematic diagram which shows the outline of the slice method of a side material. (A) is a schematic diagram which shows the structure of a laminated material, (b) is a schematic diagram which shows the outline of a hot rolling process. It is a figure which shows the flow of the manufacturing method of the conventional clad material.

Explanation of symbols

S1a Side material manufacturing process S1b Core material manufacturing process S2 Superposition process S3 Homogenization heat treatment process S4 Hot rolling process S5 Cold rolling process 1a, 1b, 1c, 1d, 1e, 1f Clad material for heat exchanger 2 Core material 3 Wax Material 4 Sacrificial material 5 Intermediate material 17 Side material ingot 35 Side material 35a Installation surface 25 Core material ingot 26 Core material 40 Superposition material

Claims (10)

A method for producing the side material used for a heat exchanger clad material comprising a core material and one or more side materials laminated on one or both sides thereof,
At least one layer of the side material is a metal for a side material having a component composition different from that of the core material, and a melting step for dissolving the metal for the side material;
A casting process for producing the ingot for the side material by casting the metal for the side material melted in the melting step;
A method for manufacturing a side material, comprising: performing a slicing step of slicing the ingot for side material into a predetermined thickness in this order.   2. The method for manufacturing a side material according to claim 1, wherein, in the slicing step, the ingot for side material is sliced in parallel to an installation surface of the ingot for side material installed horizontally. .   The method for producing a side material according to claim 1 or 2, further comprising performing a homogenization heat treatment on the cast side material ingot after the casting step and before the slicing step. .   The side material manufacturing method according to any one of claims 1 to 3, wherein after the slicing step, a surface smoothing process is further performed on the surface of the sliced side material having a predetermined thickness. Method.   The method for producing a side material according to claim 4, wherein the surface smoothing treatment is performed by one or more methods selected from a cutting method, a grinding method, and a polishing method.   The method for manufacturing a side material according to any one of claims 1 to 5, wherein at least one layer of the side material has a flatness of 1 mm or less per 1 m in the longitudinal direction.   The surface roughness of the at least one layer of the side material is in the range of 0.05 to 1.0 μm in arithmetic mean roughness (Ra), according to any one of claims 1 to 6. The manufacturing method of the side material of description.   The method for producing a side material according to any one of claims 1 to 7, wherein at least one layer of the side material has a thickness of 10 to 250 mm. A preparation step of preparing a side material manufactured by the manufacturing method according to any one of claims 1 to 8, and a core material for overlapping the side material;
An overlapping step of overlapping the core material and the side material in a predetermined arrangement to form an overlapping material;
A homogenizing heat treatment step of performing a homogenizing heat treatment on the laminated material;
A hot rolling step of performing hot rolling after the homogenizing heat treatment step;
A method for producing a clad material for a heat exchanger, comprising: a cold rolling step in which cold rolling is performed after the hot rolling step.   A clad material for heat exchangers produced by the method for producing a clad material for heat exchangers according to claim 9.

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