JP2006283114A - Aluminum foil for multi-hole machining, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide aluminum foil for multi-hole machining which is suitable for use in making fine holes at high density by rolling and also to provide its manufacturing method. <P>SOLUTION: The aluminum foil for multi-hole machining has a composition consisting of, by mass, 0.05 to 0.30% Si, 0.15 to 0.60% Fe, 0.01 to 0.20% Cu and the balance Al with inevitable impurities and is characterized by having a tensile strength σ<SB>B</SB>of ≥180 N/mm<SP>2</SP>, a 0.2% proof stress σ<SB>0.2</SB>of ≥150 N/mm<SP>2</SP>and a yield ratio (σ<SB>0.2</SB>/σ<SB>B</SB>) of ≥0.8. Further, it is preferable that the foil thickness of the aluminum foil for multi-hole machining ranges from 20 to 90 μm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an aluminum foil that is perforated with a roll for punching, and a method for producing the same.

  Up to now, various sound absorbing plates and soundproofing plates (hereinafter collectively referred to as “sound-absorbing plates” and “noise-reducing plates”) are used to increase the quietness of automobiles, to provide soundproofing of houses, and to reduce the driving noise of automobiles on highways. The sound absorbing structure has been developed.

  For example, as described in detail in Non-Patent Document 1, aluminum or an aluminum alloy is used as a sound-absorbing structure for reducing the driving noise of an automobile on an expressway or the like. Aluminum porous sound absorbing plates (hereinafter referred to as aluminum porous sound absorbing plates) using materials such as fiber alloys, powder alloys, and foamed alloys have been developed.

  In this aluminum porous sound absorbing plate, sound is diffused by repeatedly diffusing sound into fiber alloy, powder alloy, foamed alloy, etc., and converting the energy of the sound into thermal energy accompanied by vibrations, thereby reflecting the sound. Can be small.

In addition to this, for example, Patent Document 1 describes a porous sound absorbing plate that applies the principle of a resonance sound absorbing system.
This Patent Document 1 describes that the porous sound absorbing plate is composed of an interior plate corresponding to the porous plate, an air layer, and an exterior plate corresponding to the sound insulation plate.

  And this patent document 1 shows the relationship of a hole area rate (1-5%), a sound absorption rate, etc. when the plate | board thickness of the porous plate used for a porous sound absorption plate is 0.3-3.0 mm. In addition, it is described that if the plate thickness and the aperture ratio are set within these ranges, a good sound absorption coefficient (0.3) can be obtained.

  Conventionally, such a perforated plate could be manufactured by pressing, but fine holes having a diameter of about 0.1 mm at intervals of about 1 mm on a wide plate exceeding 1 m. In order to open it, a dedicated large press and a metal mold are required, which is expensive.

In addition, although it does not open a fine hole, embossing is conventionally performed by roll processing using an embossing roll, and an aluminum plate or aluminum foil is given a concavo-convex pattern, so that its strength and workability It has been carried out to improve the appearance and to obtain a matte appearance.
JP 2003-50586 (paragraphs 0029 to 0031, 0038 to 0044, FIG. 1, FIG. 4 to FIG. 6, FIG. 8) "Utilization of aluminum porous plate for sound absorbing material" Toru Morimoto, Light Metal, 54 (10) (2004), pages 436-439, Japan Society of Light Metals

  However, as described in Non-Patent Document 1, an aluminum porous sound absorbing plate using a fiber alloy, a powder alloy, a foamed alloy, or the like is extremely expensive, and has hardly been used over a wide range. .

  Patent Document 1 seeks an appropriate range and the like regarding the structure of a porous sound absorbing plate applying the principle of a resonance sound absorbing system, and the thickness, aperture ratio, and sound absorbing rate of a material (porous thin plate) used therefor. However, the material for forming such a porous thin plate, its characteristics, and the method for producing the porous thin plate have not been studied in detail, and no mention has been made.

  Therefore, simply by applying the embossing roll technology, drilling is performed by using a roll for drilling having a needle-like projection with a truncated cone-shaped tip having a height higher than the thickness of the foil. For example, it was difficult to suitably open fine holes having a diameter of about 0.1 mm at intervals of about 1 mm in a wide material (aluminum foil) exceeding 1 m, for example. That is, it has been desired to develop a material (aluminum foil) suitable for opening fine holes with high density by the roll processing as described above.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a material (aluminum foil for porous processing) suitable for opening fine holes with high density by roll processing and a method for manufacturing the same. And

  As a result of diligent research, the present inventors have made it possible to easily perforate the aluminum foil to be rolled by optimizing the alloy composition of the aluminum alloy and its strength and yield ratio. The inventors have found that this can be solved, and have completed the present invention.

The aluminum foil for porous processing of the present invention that has solved the above problems is Si: 0.05 to 0.30 mass%, Fe: 0.15 to 0.60 mass%, Cu: 0.01 to 0.20 mass%. % containing the balance being made of Al and unavoidable impurities, the tensile strength σ _B 180N / mm ² or more, 0.2% proof stress sigma _0.2 to 150 N / mm ² or more and the yield ratio (sigma _0.2 / σ _B ) is 0.8 or more.

  Here, “Haku” in this specification refers to a metal material having a thickness of 0.2 mm or less in accordance with JIS H 4160.

  Thus, the alloy composition of the aluminum foil for porous processing is specified in an appropriate range, and the yield ratio of the aluminum foil for porous processing is appropriately specified, and the strength is high. When the steel is rolled, it can be easily perforated.

  Moreover, the thickness of the aluminum foil for porous processing of the present invention is preferably 20 to 90 μm.

  As described above, by defining the thickness of the aluminum foil for porous processing within an appropriate range, it is possible to obtain the aluminum foil for porous processing having good punchability.

  And the manufacturing method of the aluminum foil for porous processing of this invention which solved the said subject is: Si: 0.05-0.30 mass%, Fe: 0.15-0.60 mass%, Cu: 0.01 An ingot-making process for producing an ingot by melting and casting an aluminum alloy containing ~ 0.20 mass%, the balance being composed of Al and inevitable impurities, and the ingot at 500 to 600 ° C. at 2 to 24 Homogenization heat treatment process that performs homogenization heat treatment for time, hot rolling process that hot-rolls the homogenized heat-treated ingot to produce a hot-rolled sheet, and cold-rolled sheet by cold-rolling the hot-rolled sheet The first cold rolling step for producing the intermediate, the intermediate annealing step for performing the intermediate annealing for 0.5 to 24 hours at 350 to 450 ° C., and further cold rolling the cold-rolled plate subjected to the intermediate annealing. A second cold rolling process is included.

Thus, by defining the alloy composition of the aluminum foil for porous processing within an appropriate range, and appropriately specifying the processing conditions for the homogenization heat treatment and the intermediate annealing, the aluminum for porous processing Strength, that is, tensile strength σ _B and proof stress σ _0.2 can be sufficiently increased, and the yield ratio (σ _0.2 / σ _B ) can be appropriately defined, so that it is easy to perforate aluminum. Foil can be manufactured.

Since the aluminum foil for porous processing of the present invention is easily perforated when rolled, it can be provided as a material suitable for opening fine holes with high density (aluminum foil for porous processing).
Especially suitable for porous processing because it has better punchability due to the appropriate thickness of aluminum foil for porous processing, and it is easy to handle because it does not easily wrinkle during roll processing. Aluminum foil can be obtained.

  Further, according to the method for producing a porous aluminum foil of the present invention, a material (aluminum foil for porous machining) that is easy to perforate when rolled and suitable for opening fine holes at a high density is provided. Can be manufactured.

Hereinafter, the aluminum foil for porous processing and the manufacturing method thereof according to the best mode for carrying out the present invention will be described in detail.
First, the aluminum foil for porous processing according to the embodiment of the present invention will be described.

[1. Aluminum foil for porous machining]
The aluminum foil for porous processing of the present invention contains Si: 0.05 to 0.30 mass%, Fe: 0.15 to 0.60 mass%, Cu: 0.01 to 0.20 mass%, balance consists of Al and unavoidable impurities, the tensile strength sigma _B at 180 N / mm ² or more, 0.2% yield strength σ _0.2 150N / mm ² or more and the yield ratio (σ _0.2 / σ _B) 0.8 or more.
In addition, it is preferable that the aluminum foil for porous processing has a thickness of 20 to 90 μm.
The reason why the alloy composition and strength, yield ratio, and thickness of the foil contained in the aluminum foil for porous processing of the present invention are limited will be sequentially described.

(Si: 0.05-0.30 mass%)
Si is added to form a coarse Al—Fe—Si intermetallic compound. When the Si content is less than 0.05% by mass, the Al—Fe—Si intermetallic compound is changed to a binary Al—Fe intermetallic compound, and the number of Al—Fe intermetallic compounds is As it increases, it becomes finer. When the number of Al—Fe-based intermetallic compounds increases, the work hardening at the time of rolling is stagnated, so that the punchability is lowered. On the other hand, if the Si content exceeds 0.30% by mass, there is a problem in recyclability as a general-purpose alloy. In other words, general-purpose (such as foil, can, fin, etc.) aluminum alloy sheet materials require that the Si content be 0.3% or less, and those containing Si exceeding 0.3% by mass are general-purpose alloys. Cannot be used as recycled.
Therefore, in this invention, content of Si shall be 0.05-0.30 mass%.

(Fe: 0.15 to 0.60 mass%)
Addition of Fe is effective for recrystallized grains and is effective for improving strength. For this reason, content of Fe needs to be 0.15 mass% or more. On the other hand, if the Fe content exceeds 0.60% by mass, the Al—Fe—Si intermetallic compound increases, and the stagnation of work hardening becomes remarkable due to heat generation during the rolling, so that the punching property is rather high. Decreases.
Therefore, in this invention, content of Fe shall be 0.15-0.60 mass%.

  In order to form an Al—Fe—Si intermetallic compound, the Fe / Si content ratio is preferably 1 or more and 5 or less. If the Fe / Si content ratio is less than 1, Si will be in an excessive state, so that the resin adhesion tends to be lowered by changing the surface characteristics. On the other hand, when the content ratio of Fe / Si exceeds 5, since the Si content is smaller than the Fe content, the Al—Fe—Si intermetallic compound is a binary Al—Fe based metal. Since the number of Al—Fe-based intermetallic compounds is increased by changing to an intermetallic compound, work hardening at the time of rolling is stagnated and the punchability is lowered, which is not preferable.

(Cu: 0.01-0.20% by mass)
For example, Cu is added to suppress a decrease in strength when bonded using a resin, for example, in order to cause stagnation of work hardening during rolling and to produce a porous sound absorbing plate. For this reason, Cu content needs to be 0.01 mass% or more. On the other hand, if the content of Cu exceeds 0.2% by mass, the strength at the time of rolling is too high, so that the rollability is lowered.
Therefore, in this invention, content of Cu shall be 0.01-0.20 mass%.
Note that Cu exhibits the effects of the stagnation of work hardening and the suppression of strength reduction as described above in combination with the intermediate annealing temperature condition.

(Inevitable impurities)
The aluminum foil for porous processing of the present invention may contain Cr, Zn, Zr, B, etc. as unavoidable impurities, but as long as the content of such elements is 0.01% by mass or less, The aluminum foil for porous processing of the present invention can have the characteristics required. Therefore, it is permissible to contain such inevitable impurities.

(Ti: 0.003 to 0.03 mass%)
Ti is not an essential element as an alloy component of the aluminum for porous processing of the present invention, but since the ingot structure is coarse, appearance patterns such as streaks are easily generated, so the ingot structure is refined. It is desirable to do. For this purpose, it is effective to use an Al-Ti-B finening agent, and it is desirable to add 0.003% by mass or more in terms of Ti amount. On the other hand, if the Ti amount exceeds 0.03% by mass, the effect of miniaturization is saturated, which is economically disadvantageous.

(Mn: 0.05 mass% or less, Mg: 0.05 mass% or less)
Mn and Mg are not essential elements as an alloy component of the aluminum for porous machining of the present invention, but contribute to work hardening stagnation during rolling and have an effect of improving strength, and therefore may be added to the aluminum alloy. Although desirable, in order to reduce the rollability, the content is desirably 0.05% by mass or less.

(Tensile strength σ _B: 180N / mm ^2, and 0.2% proof stress σ _0.2: 150N / mm ²⁾
The tensile strength σ _B is 180 N / mm ² or more, more preferably 190 N / mm ² or more. Furthermore, 0.2% proof stress sigma _0.2 is, 150 N / mm ² or more, and more preferably to the 160 N / mm ² or more. This is to obtain an easy punching property while having high strength as an aluminum foil.

(Yield ratio (σ _0.2 / σ _B ): 0.8 or more)
Yield ratio means the ratio of 0.2% proof stress σ _0.2 to tensile strength σ _B (that is, the ratio of strain at yield point to strain at tensile strength). A high yield ratio means yield It means that there is no room from the point to the tensile strength. That is, it means that extremely local fracture can be easily generated by plastic deformation.
In order to provide a high yield ratio (0.8 or more), an aluminum foil for porous processing is manufactured by an aluminum foil for porous processing described later using an aluminum alloy having a predetermined composition as described above. However, the present invention is not limited to this.

  As a result of studies by the present inventor, for example, in drilling by roll processing using a roll for drilling having a needle-like projection having a truncated cone shape at the tip having a height higher than the thickness, aluminum is used during the roll processing. The tip of the needle-like protrusion is pushed into the surface of the foil, and the hole is introduced by breaking the aluminum foil from the corner of the tip of the truncated cone. At this time, by controlling the yield ratio to be high, the aluminum foil can be easily broken by the tip of the truncated cone to be pushed in, so that the aluminum foil can be easily perforated.

  In order to form easily drilled holes and well-shaped holes, the yield should be controlled by appropriately controlling the alloying components of the aluminum for porous processing and the manufacturing conditions such as the conditions for homogenization heat treatment and intermediate annealing. The ratio needs to be 0.8 or more, more preferably 0.85 or more. If the yield ratio is less than 0.8, it is not possible to form holes in a good state when rolled, and therefore it is not possible to obtain a hole distribution (size and density) for ensuring a sound absorbing function. Therefore, in the present invention, the yield ratio needs to be 0.8 or more.

(Foil thickness: 20-90 μm)
In addition, the thickness of the aluminum foil for porous processing according to the present invention is preferably regulated to an appropriate range from the viewpoints of punchability and handleability.
If the foil thickness is less than 20 μm, wrinkles and cracks are likely to occur during handling, and the handleability deteriorates. Further, depending on the use environment, corrosion or cracking may occur, and the sound absorbing function may be deteriorated. On the other hand, when the foil thickness exceeds 90 μm, the drilling property is remarkably lowered, and the hole distribution for ensuring the sound absorbing function (for example, hole size: diameter φ: about 0.1 mm × space between adjacent holes: 1 mm) Can't get.

[2. Manufacturing method of aluminum foil for porous machining]
Next, as a result of earnest research to solve the above-mentioned problems, the present inventors have prescribed the alloy composition of the material to be rolled (aluminum foil) within an appropriate range, and the processing conditions for the homogenization heat treatment, By appropriately defining the treatment conditions for the intermediate annealing, a method for producing a material (aluminum foil) that easily causes local cracking by roll processing has been found, and the present invention has been completed.

  That is, the manufacturing method of the aluminum foil for porous processing of the present invention is as follows: Si: 0.05 to 0.30 mass%, Fe: 0.15 to 0.60 mass%, Cu: 0.01 to 0.20 mass Ingot process, in which an aluminum alloy composed of Al and the remainder composed of Al and inevitable impurities is melted and cast to produce an ingot, and this ingot is homogenized at 500 to 600 ° C. for 2 to 24 hours A homogenization heat treatment step for performing heat treatment, a hot rolling step for hot rolling the ingot that has been subjected to the homogenization heat treatment to produce a hot rolled plate, and a cold rolling plate for producing a cold rolled plate. 1 cold rolling process, an intermediate annealing process in which the cold-rolled sheet is subjected to intermediate annealing at 350 to 450 ° C. for 0.5 to 24 hours, and a second cold for further cold-rolling the intermediate-annealed cold-rolled sheet It includes a hot rolling process.

  As described above, the method for producing the aluminum foil for perforating processing according to the present invention comprises the steps of adjusting the components of the aluminum alloy, preferably adding the ingot structure refining agent (for example, TiB), and then ingoting and homogenizing heat treatment. These are hot-rolled and further cold-rolled (including intermediate annealing). As described below, it is necessary to appropriately define the homogenization heat treatment conditions and the intermediate annealing conditions.

  Next, each condition defined in the method for producing the aluminum foil for porous machining will be described. The reason for limiting the numerical value of the alloy component of the aluminum alloy is as follows. Since it is the same, the description is abbreviate | omitted.

(Conditions for homogenization heat treatment process: 2 to 24 hours at 500 to 600 ° C.)
The homogenization heat treatment is performed by adjusting the degree of work hardening and adjusting the yield ratio in order to improve the punchability after rolling by adjusting the morphology / distribution of the crystallized material and the precipitation state. This is because the strength of the aluminum foil in the case of being used as a component of the sound absorbing structure after drilling is prevented.

  For this purpose, it is necessary to perform a homogenization heat treatment at 500 to 600 ° C. for 2 to 24 hours. When the homogenization heat treatment temperature is less than 500 ° C. or the homogenization heat treatment time is less than 2 hours, the above effect cannot be sufficiently obtained because the solid solution of the aluminum alloy having the above composition is insufficient. . On the other hand, when the homogenization heat treatment temperature exceeds 600 ° C. or the homogenization heat treatment time exceeds 24 hours, the effect is no longer saturated, which is economically disadvantageous.

(Intermediate annealing conditions at 350 to 450 ° C. for 0.5 to 24 hours)
As described above, intermediate annealing is performed on the cold-rolled sheet obtained by the first cold rolling process.
The intermediate annealing step is necessary to adjust the solid solution level of the material (aluminum foil) to adjust the work hardening characteristics after rolling to obtain a yield ratio of 0.8 or more, and as an aluminum foil for porous machining It is necessary for obtaining high strength (tensile strength and proof stress) and softening resistance.
For this purpose, it is necessary to perform an intermediate annealing at 350 to 450 ° C. for 0.5 to 24 hours. If the intermediate annealing temperature is lower than 350 ° C., the desired strength may not be obtained. On the other hand, when the temperature of the intermediate annealing exceeds 450 ° C., the effect of improving the strength is small, which is economically disadvantageous.
Further, if the annealing time of the intermediate annealing is less than 0.5 hour, the degree of solid solution is insufficient and non-uniform in the coil longitudinal and width directions. Therefore, a high strength cannot be obtained uniformly in the coil longitudinal direction, and a high yield ratio is difficult to obtain. On the other hand, when the annealing time of the intermediate annealing exceeds 24 hours, the effect is no longer saturated and it is economically disadvantageous.

  Thus, after ingot forming, the ingot subjected to homogenization heat treatment under appropriate conditions is hot-rolled under appropriate conditions to obtain, for example, a hot rolled sheet having a thickness of 2 to 6 mm. Next, cold rolling (first cold rolling step) is performed using the hot-rolled sheet to obtain, for example, a cold-rolled sheet having a thickness of 0.2 to 0.8 mm. And after performing an intermediate annealing on the conditions mentioned later, cold rolling (2nd cold rolling process) is performed again, for example, the aluminum foil for porous processing of thickness 20-90 micrometers is obtained.

  Next, the aluminum foil for porous processing of the present invention and the manufacturing method thereof will be specifically described by comparing an example that satisfies the conditions of the present invention with a comparative example that does not satisfy the conditions of the present invention.

(1) First, the ingots were formed by adjusting the aluminum alloys having the compositions shown in Examples 1 to 7 and Comparative Examples 1 to 8 in Table 1, and the balance being Al and inevitable impurities. Homogenization heat treatment was performed under the conditions shown in Table 1. And the ingot which performed the homogenization heat processing was hot-rolled, and the hot-rolled board with a plate thickness of 5 mm was obtained. Subsequently, this hot-rolled sheet was cold-rolled (first cold rolling) to obtain a cold-rolled sheet having a thickness of 0.4 mm. Then, this cold-rolled sheet was subjected to intermediate annealing under the conditions shown in Table 1, and cold rolling (second cold rolling) was performed again using the intermediate-annealed cold-rolled sheet, and the thickness shown in Table 1 was removed. The aluminum foil which concerns on Examples 1-7 and Comparative Examples 1-8 which have thickness (micrometer) was manufactured.
The underlined portion in Table 1 indicates that the conditions of the present invention are not satisfied.

  And the evaluation about the intensity | strength and punching property of the aluminum foil which concerns on Examples 1-7 manufactured by this composition and the above-mentioned manufacturing method and Comparative Examples 1-8 was performed.

〔Strength〕
About the aluminum foil of Examples 1-7 and Comparative Examples 1-8, the JIS5 tension test piece was produced so that a tension direction might become parallel to a rolling direction. Then, the tensile test by JISZ2241 was implemented and tensile strength (sigma) _B , yield strength (sigma) _0.2, and elongation were measured.
The yield ratio (σ _0.2 / σ _B ) was calculated from the measured tensile strength σ _B and yield strength σ _0.2 . A material having a yield ratio of 0.8 or more was considered good.

[Perforation]
Moreover, about the punchability of the aluminum foils of Examples 1 to 7 and Comparative Examples 1 to 8, 1 m ² of aluminum foil was prepared for each, and the base diameter φ0.2 mm, the tip diameter φ0.06 mm × height Holes with a diameter of about 0.1 mm were drilled at intervals of 1 mm by rolling (rolling) with a drilling roll having a frustoconical needle-like projection having a truncated cone shape of 0.15 mm and a pitch of 1 mm. Then, the perforated aluminum foil was visually observed, and when the ratio of the through holes was 80% or more, it was evaluated that the drilling ability was excellent (“◯”), and further, crack propagation between the through holes was hardly observed. Those that were not observed were evaluated as being particularly excellent in punchability (“）”). On the other hand, those having a through-hole ratio of less than 80% were evaluated as being inferior in punchability ("x").

  Table 2 shows the evaluation results of the strength and punchability of the aluminum foils according to Examples 1 to 7 and Comparative Examples 1 to 8. In Table 2, underlined portions indicate that the conditions of the present invention are not satisfied.

  As shown in Table 2, in Examples 1 to 7, all the conditions of the composition of the aluminum alloy, the conditions of the homogenization heat treatment process, and the conditions of the intermediate annealing process satisfied the range defined in the present invention. Therefore, good results were obtained for all evaluation items of strength, yield ratio and punchability. In particular, in Examples 1 to 6, the propagation of cracks was hardly observed between the through holes, and the drilling property was particularly excellent.

  On the other hand, in Comparative Examples 1 to 8, since any one of the composition of the aluminum alloy, the condition of the homogenization heat treatment process, and the condition of the intermediate annealing process was out of the range defined in the present invention, the strength, the yield ratio, and At least one of the evaluation items for punchability was not preferable.

  Specifically, in Comparative Example 1, since the Si content was less than the range specified in the present invention, work hardening during the rolling was stagnant, and the strength was not improved. The result was inferior.

  In Comparative Example 2, since the Fe content was less than the range specified in the present invention, the effect of improving the strength could not be obtained. For this reason, a desired yield ratio could not be obtained, resulting in poor hole punchability.

  In Comparative Example 3, since the Fe content exceeded the range specified in the present invention, work hardening was stagnant due to heat generation during the rolling, and the strength was not improved. became.

  In Comparative Example 4, since the Cu content was less than the range specified in the present invention, it was not possible to suppress the decrease in strength when bonded using a resin. Therefore, a desired yield ratio could not be obtained, resulting in poor hole opening.

  In Comparative Example 5, since the temperature condition of the homogenization heat treatment was less than the range specified in the present invention, the solid solution of the aluminum alloy became insufficient. Therefore, as a result of inappropriate adjustment of the morphology / distribution of the crystallized product and adjustment of the precipitation state, work hardening also becomes insufficient, and a desired yield ratio cannot be obtained, resulting in inferior punchability. .

  In Comparative Example 6, since the processing time of the homogenization heat treatment was less than the range specified in the present invention, the solid solution of the aluminum alloy became insufficient. Therefore, as a result of inappropriate adjustment of the morphology / distribution of the crystallized product and adjustment of the precipitation state, work hardening also becomes insufficient, and a desired yield ratio cannot be obtained, resulting in inferior punchability. .

  In Comparative Example 7, since the temperature condition of the intermediate annealing was less than the range specified in the present invention, the desired strength was not obtained. For this reason, a desired yield ratio could not be obtained, resulting in poor hole opening.

  In Comparative Example 8, since the intermediate annealing treatment time was less than the range specified in the present invention, the degree of solid solution in the longitudinal and width directions of the coil became insufficient and non-uniform, and high strength was uniform in the longitudinal direction of the coil. In other words, variations in strength occurred. Therefore, a desired yield ratio could not be obtained, resulting in poor hole opening.

  In addition, when the content of Si exceeded the range specified in the present invention, a desired yield ratio could be obtained and the hole opening property was excellent, but it was not preferable from the viewpoint of recyclability (from the standard) Therefore, it was not shown in Tables 1 and 2.

  In addition, when the Cu content exceeded the range defined in the present invention, wrinkles and cracks (breaks) occurred during rolling, and the handleability was poor.

  Moreover, in the conditions of the homogenization heat treatment process and the conditions of the intermediate annealing process, if the treatment temperature and the treatment time exceed the range specified in the present invention, a desired yield ratio can be obtained, and the punchability is excellent. Although it was a thing, it was economically disadvantageous.

Furthermore, when the foil thickness was less than 20 μm, the desired strength and yield ratio could be obtained, and excellent punchability could be obtained, but wrinkles and cracks were somewhat likely to occur.
In addition, even when the thickness exceeds 90 μm, the desired strength and yield ratio can be obtained, and excellent punchability can be obtained, and there is no particular problem.

(2) Next, in order to improve the appearance and strength of the aluminum foil for porous processing according to the present invention, the content of Ti, the content of Mn, and the content of Mg were examined.
Table 3 shows the content of the composition components of the aluminum foils of Examples 8 to 11.
As shown in Table 3, Examples 8 to 11 contain Si, Fe, and Cu shown in Table 1 within the range defined by the present invention, and further include any one of Ti, Mg, and Mn as optional components. It is made to contain as.

  Ingots were formed by adjusting the respective aluminum alloys having the compositions shown in Examples 8 to 11 in Table 3 with the balance being Al and inevitable impurities, and homogenized heat treatment was performed under the conditions shown in Table 3. It was. And the ingot which performed the homogenization heat processing was hot-rolled, and the hot-rolled board with a plate thickness of 5 mm was obtained. Subsequently, this hot-rolled sheet was cold-rolled (first cold rolling) to obtain a cold-rolled sheet having a thickness of 0.4 mm. And this cold-rolled sheet was intermediate-annealed under the conditions shown in Table 3, and cold-rolled (second cold-rolling) was performed again using the intermediate-annealed cold-rolled sheet. No. 11 aluminum foil was produced.

  And the evaluation about the intensity | strength and punching property of the aluminum foil which concerns on Examples 8-11 manufactured with this composition and the above-mentioned manufacturing method was performed. The method for evaluating the strength and punchability of the aluminum foil is the same as the method described above, and the description thereof is omitted.

  As shown in Table 4, in Examples 8 to 11, all the conditions of the composition of the aluminum alloy, the conditions of the homogenization heat treatment step, and the conditions of the intermediate annealing step satisfy the range defined in the present invention. Since Ti, Mn, and Mg were contained in order to impart predetermined characteristics, good results were obtained for all evaluation items of strength, yield ratio, and punchability.

  Specifically, since Example 8 and Example 9 contain Ti in the range of 0.003 to 0.03 mass% in addition to the alloy composition defined in the present invention, they are shown in Table 4. However, there was no appearance pattern such as streak, and a good appearance could be obtained.

Since Example 10 contained Mn in a range of 0.05% by mass or less in addition to the alloy composition defined in the present invention, the aluminum foil for porous processing having high strength and high yield ratio was used. I was able to.
Since Example 11 contained Mg in a range of 0.05% by mass or less in addition to the alloy composition defined in the present invention, the aluminum foil for porous processing having high strength and high yield ratio is used. I was able to.

As mentioned above, although the aluminum foil for porous processing of this invention and the manufacturing method of the aluminum foil for porous processing of the best embodiment and an Example have been demonstrated in detail, the content of this invention is the above content. It is needless to say that the invention can be widely changed and modified without departing from the gist of the present invention.
For example, the intermediate annealing of the method for producing a porous aluminum foil according to the present invention can be carried out by continuous heat treatment. Note that the annealing conditions in this case can be appropriately set by a commonly used technique. Even in this case, the aluminum alloy is sufficiently dissolved, and the degree of work hardening can be made appropriate, so that a good hole having a high strength and a yield ratio (0.8 or more) is obtained. It is possible to produce a porous processing aluminum foil having openability.

Claims (3)

Si: 0.05-0.30% by mass, Fe: 0.15-0.60% by mass, Cu: 0.01-0.20% by mass, the balance being composed of Al and inevitable impurities, the tensile strength σ _B 180N / mm ² or more, 0.2% proof stress sigma _0.2 to 150 N / mm ² or more and porosity machining, characterized in that the yield ratio (σ _0.2 / σ _B) is 0.8 or more Aluminum foil for use.   The aluminum foil for porous processing according to claim 1, wherein the thickness is 20 to 90 μm. Si: 0.05 to 0.30% by mass, Fe: 0.15 to 0.60% by mass, Cu: 0.01 to 0.20% by mass, the balance being composed of Al and inevitable impurities An ingot-making process in which an aluminum alloy is melted and cast to produce an ingot;
A homogenization heat treatment step in which the ingot is subjected to a homogenization heat treatment at 500 to 600 ° C. for 2 to 24 hours;
A hot rolling step of hot rolling the ingot subjected to the homogenization heat treatment to produce a hot rolled sheet;
A first cold rolling step of cold rolling the hot rolled sheet to produce a cold rolled sheet;
An intermediate annealing step in which the cold-rolled sheet is subjected to an intermediate annealing at 350 to 450 ° C. for 0.5 to 24 hours;
A method for producing an aluminum foil for porous processing, comprising a second cold rolling step of further cold rolling the cold-rolled sheet subjected to the intermediate annealing.