WO2015151739A1 - アルミニウムクラッド材の製造方法 - Google Patents
アルミニウムクラッド材の製造方法 Download PDFInfo
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- WO2015151739A1 WO2015151739A1 PCT/JP2015/057086 JP2015057086W WO2015151739A1 WO 2015151739 A1 WO2015151739 A1 WO 2015151739A1 JP 2015057086 W JP2015057086 W JP 2015057086W WO 2015151739 A1 WO2015151739 A1 WO 2015151739A1
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- WIPO (PCT)
- Prior art keywords
- aluminum
- clad
- rolling
- core material
- skin
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/16—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/04—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a rolling mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/02—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch
- B32B9/025—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch comprising leather
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/041—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
Definitions
- the present invention relates to a method for producing an aluminum clad material, and in particular, an Al core material made of aluminum or an aluminum alloy is laminated and laminated on one or both sides of an Al core material made of aluminum or an aluminum alloy, and the obtained laminate
- the present invention relates to a method of advantageously producing an aluminum clad material in which an Al core material and an Al skin material are joined and integrated by hot rolling.
- Aluminum clad material is laminated in a form in which Al core material is laminated on one side or both sides of Al core material, or Al intermediate material made of aluminum or aluminum alloy is interposed between the core material and skin material depending on the application.
- a multilayer structure laminate
- such a laminate is heated to a predetermined temperature, hot-rolled, and then cold-rolled to a predetermined thickness. It is the obtained board
- Various manufacturing methods have been proposed for this type of aluminum clad material (see, for example, Patent Documents 1 to 3), and in fact, in heat exchangers for transportation equipment such as aircraft and automobiles. Although it has been used as a brazing sheet, many problems to be solved still remain in the conventional method for producing an aluminum clad material.
- the joining at the interface of the laminate subjected to the hot clad rolling described above is generally referred to as pressure welding, which means that joining is performed by applying a strong pressure at a high temperature.
- pressure welding means that joining is performed by applying a strong pressure at a high temperature.
- the oxide film since the surface of each laminated material such as the Al core material and the Al skin material is covered with the oxide film, it is necessary to destroy the oxide film for joining them.
- the oxide film cannot be destroyed and is difficult to join. It is generally recognized that it is necessary to break the oxide film by sliding the interface of these laminates.
- JIS-named 5000 series, 6000 series, and 7000 series Al alloys containing a large amount of magnesium (Mg) have Mg oxide (MgO) on the surface in addition to aluminum oxide (Al 2 O 3 ). Since it is formed and the oxide film becomes strong, it is considered difficult to produce a clad material using such an aluminum core material or skin material.
- the sliding at the interface during clad rolling is generally understood to be beneficial in destroying the oxide film, but as an adverse effect caused by such sliding,
- the cladding ratio distribution can be deteriorated. That is, the sliding of the interface is caused by the difference in elongation between the Al core material and the Al skin material during rolling, but in the rolling of the clad material, the portion closer to the rolling roll tends to stretch in the rolling direction. Therefore, when the strength of the core material is the same as that of the skin material, or the strength of the skin material is lower than the strength of the core material, the elongation of the skin material becomes remarkable compared to the core material, and conversely, the strength of the core material is the strength of the skin material.
- the elongation of the core material may become remarkable as compared with the skin material.
- the core material and the skin material will be stretched uniformly.
- many factors such as the material of the core material and the skin material, the cladding rate, and the transition of the rolling temperature and reduction (rolling rate) affect the difference in elongation. For this reason, it is difficult to accurately predict the difference in elongation between the core material and the skin material until the interface is sufficiently bonded, and this causes a decrease in the accuracy of the cladding rate. It is.
- the front and rear end portions in the rolling direction At the left and right ends in the width direction there will be a difference in the cladding ratio compared to the center part.
- the cladding ratio at the front and rear ends and the left and right ends will decrease. It becomes.
- the front and rear end portions and the left and right end portions where the clad rate is outside the allowable range are generally cut and removed, which significantly reduces the yield of the clad rolled material. This is a factor that greatly increases the cost of the clad material.
- the reason for the difference in the clad rate at different parts of the aluminum clad material in other words, the variation in the clad rate distribution is considered as follows.
- the initial number of passes in the hot clad rolling for the production of the clad material is determined as follows. Without being joined to the skin, it is applied only to stretching or flattening of the skin material. Further, even when the bonding interface of the skin material is machined to improve its flatness, only the skin material or the core material may extend substantially in the initial few passes. At this time, for example, when only the skin material is stretched, first, the clad rate in the entire clad material is decreased, and the degree of the decrease in the clad rate becomes more conspicuous at the end portion where the resistance of the skin material is small as described above. It is.
- the rolling reduction rate is slightly increased, the Al core material and the Al skin material are greatly stretched by a strong rolling force, and a strong frictional force is generated at the bonding interface, thereby oxidizing.
- the film is broken so that it is fully bonded, complete bonding of the interface does not occur uniformly at the same time across the interface.
- the thickness reduction of the skin material by the extension of the skin material preferentially proceeds rather than the decrease in the thickness direction of the core material,
- the cladding rate partially decreases. Since this partial decrease in the cladding rate occurs at portions other than the front and rear ends and the left and right ends of the cladding material, even within the product surface that is not subject to cutting, the cladding rate varies unevenly. Will occur.
- the accuracy of the entire clad material is distorted.
- the clad rate is greatly changed, and even within the product surface that is not the object of excision, the clad rate varies unevenly.
- the present invention has been made in the background of such circumstances, and the problem to be solved is to greatly improve the clad rate distribution of the aluminum clad material and to significantly improve the product yield.
- Another object of the present invention is to provide a method for producing an aluminum clad material that can greatly relax the restrictions on the material and clad rate of the laminated material to be clad.
- the Al core material made of aluminum or aluminum alloy is laminated and laminated on one side or both sides of the Al core material made of aluminum or aluminum alloy.
- the aluminum wire made of aluminum or aluminum alloy is used as the vertical and horizontal lines.
- the thickness formed by intersecting the vertical lines and the horizontal lines obtained by intersecting them in a grid pattern is a point-like thick portion of 0.2 to 3.2 mm in two vertical and horizontal directions.
- a joining auxiliary member having a structure arranged at an interval of 0.2 to 13 mm in FIG. 2 is used to join the Al core material and the Al skin material.
- the gist of the method is a method for producing an aluminum clad material, which is characterized in that hot rolling of the laminate is carried out in a state where the laminate is in communication therewith.
- the joining auxiliary member has a thickness of 5 to 200 ⁇ m on one side or both sides thereof and an Mg content of 0 to 0.
- the laminate is configured by interposing the joining auxiliary member and the Al sheet at the joining interface between the Al core material and the Al skin material. And the structure which implemented hot rolling with respect to this laminated body will also be employ
- the Al wire has a wire diameter of 0.1 to 1.6 mm.
- the Al wire is formed of an Al—Mg alloy containing 1.5 to 6% by mass of magnesium. Yes.
- the Al wire material constituting the joining auxiliary member has its surface oxide film chemically destroyed and removed by treatment with an acid solution or an alkali solution.
- the hot rolling is performed by passing the laminate a plurality of times between a pair of rolling rolls, and the odd number of times.
- the rotation directions of the rolling rolls are opposite to each other, and reverse rolling is performed in which the rolling directions are alternately opposite to each other.
- the laminate is loaded, and then the rolling roll is rotated.
- the reverse rolling is performed such that the hot rolling proceeds and the rolling rolls rotate in opposite directions each time the rolling roll is passed.
- a plate-like Al intermediate material made of aluminum or an aluminum alloy is further provided between the Al core material and the Al skin material.
- the joining auxiliary member is disposed between the Al core material and the Al intermediate material and between the Al intermediate material and the Al skin material, and the Al core material is interposed between the Al core material and the Al intermediate material.
- the laminate is configured with the Al intermediate material, the joining auxiliary member, and the Al skin material partially fixed or not fixed at the outer peripheral portion thereof.
- a plate-like Al intermediate material made of aluminum or an aluminum alloy is provided between the Al core material and the Al skin material. Further, the joining auxiliary member is interposed between at least one side between the Al core material and the Al intermediate material and between the Al intermediate material and the Al skin material.
- the laminate is configured to be interposed. Yes.
- the Al sheet as described above is preferably made of pure aluminum or an aluminum material having an aluminum content of 99.0% by mass or more.
- an aluminum clad material according to the present invention compared to a hot rolling process in the production of a conventional aluminum clad material, first, a large number of point-like thick portions distributed at predetermined intervals in a joining auxiliary member.
- a large number of point-like thick portions distributed at predetermined intervals in a joining auxiliary member.
- the quality of the obtained aluminum clad material is improved in several points by the fact that the Al core material and the Al skin material positioned on both sides of the joining auxiliary member are rolled without sliding against each other. Become.
- the present invention is further superior in that an aluminum clad material having a clad rate that was difficult to adopt and an aluminum material that was difficult to produce in the conventional hot clad rolling process can be produced. That is. That is, even when the Mg content of the laminated material to be clad is large, the oxide film is destroyed by the strong rolling force applied to the spot-like thick part, and the shearing force generated at the boundary between the spot-like thick part and the others As a result, the destruction of the oxide film progresses, and as a result, the joining region expands starting from the point-like thick part, so that a laminate material with a high Mg content can be easily clad rolled. It became. In addition, even when the cladding ratio is high or low, the same bonding process can be reproduced. Therefore, according to the present invention, restrictions on the cladding ratio can be substantially eliminated. It will be.
- the production yield of the aluminum clad material can be greatly improved, and not only a significant cost reduction is brought about, but also a material that has been difficult to produce in the past. It was possible to manufacture a high-difficult aluminum clad material having a cladding ratio and a high quality, and there is a great feature there.
- the Mg content is 0 to 0.00 on one side or both sides of a joining auxiliary member having a configuration in which a predetermined point-like thick portion is formed at the intersection of the network structure.
- the joining auxiliary member formed with the predetermined spot-like thick part has a function of effectively destroying the oxide film existing on the surface of the Al core material, the Al skin material, and the Al sheet disposed on both sides thereof.
- the Al sheet disposed on one side or both sides of such a joining auxiliary member has a function of promoting interfacial bonding between the Al core material and the Al skin material after the oxide film is destroyed. is there.
- the load concentrates on the contact point between the point-like thick part of the joining auxiliary member and the Al skin material or the Al core material via the Al sheet, and is intense.
- the oxide film of the skin material or the core material is effectively destroyed at the contact point, and the contact point is further reduced. Due to the shearing force generated at the boundary between the contact point and the other part, the destruction of the oxide film starts from such a contact point. At the same time, the dotted thick part of the auxiliary joining member bites into the Al sheet by a strong load, so that the Al sheet is greatly deformed, and the Al sheet is covered with the deformation. The oxide film that is present will be destroyed.
- the Al sheet is made of a soft Al material having an Mg content of 0 to 0.7% by mass, the exposed Al skin material and Al core material due to the progress of the destruction of the oxide film described above
- the metal surfaces with the Al sheet are immediately strongly pressed and joined together.
- the exposed metal surfaces are immediately strongly pressed and joined in the same manner as described above.
- the joining auxiliary member bites into the Al core material and the Al skin material, the sliding at the interface between the core material and the skin material is suppressed, and the core material and the skin material are integrally extended. In addition, the effect of greatly improving the distribution of the cladding ratio can be obtained.
- a predetermined Al wire 8 made of aluminum or aluminum alloy is crossed in a grid pattern in two vertical and horizontal directions, and a dotted thick portion formed at the crossing portion.
- 10 is substantially clad-rolled with the Al core material 2 and the Al skin material 4 through the joining auxiliary member 6 having a configuration in which two are distributed at predetermined intervals in two vertical and horizontal directions. It has a great feature in that it can be joined with almost no sliding at the joining interface. That is, due to the presence of the joining auxiliary member 6, it is very strong in the thick portion 10 distributed in a dotted manner in the initial stage of hot rolling for cladding, particularly in the stage of causing sliding at the joining interface.
- the Al core material 2 and the Al skin material 4 are clad, the Al core material 2 and the Al skin material 4 are joined together via the point-like thick portion 10 when the rolling force is applied. Is fixed in a dot shape, and sliding of the joining interface hardly occurs.
- a member having a structure having no dotted thick portion between the Al core material and the Al skin material to be joined such as an aluminum punching metal (a circular or rectangular hole in a mesh shape)
- an aluminum punching metal a circular or rectangular hole in a mesh shape
- the Al core material 2 and the Al skin material 4 have a point thickness. It joins via the part which has connected the meat
- the Al core material 2 and the Al skin material 4 are slightly deformed in the cell. .
- the point-like thick portions 10 need to be held in a fixed manner in two vertical and horizontal directions. If this point-like thick part 10 is isolated and its position is not constrained or fixed, the point-like thick part 10 isolated by a strong reduction force is temporarily attached to the Al core material 2 or the Al skin material 4. This is because even in the next rolling pass, the joint portion of the dotted thick portion 10 is easily broken by the shearing force generated by the expansion of the Al core material 2 or the Al skin material 4. As a result, substantially the same effect as the present invention cannot be exhibited due to the occurrence of sliding at the joint interface, as in the state where the point-like thick portion 10 does not exist.
- the fixed holding by the Al wire 8 in the two vertical and horizontal directions of the point-like thick portion 10 is basically realized by positioning the Al wire 8 in the rolling direction and the direction orthogonal to the rolling direction. Even if it is realized by the Al wire 8 arranged in the direction rotated by 45 ° with respect to the two directions, the same effect can be exhibited.
- the thickness T of the dotted thick portion 10 in the joining auxiliary member 6 is, as shown in FIG. 2B, among the materials to be laminated, particularly when the Al skin material 4 is laminated.
- An appropriate thickness is appropriately selected according to the thickness of the material, but the thickness of the dotted thick portion 10 is less than 0.2 mm regardless of the thickness when the Al skin material 4 is laminated. Then, the joint strength of the point-like thick portion 10 is reduced, and the desired effect is hardly exhibited.
- the thickness exceeds 3.2 mm the surface of the resulting clad material is smoothed. The sexuality will be adversely affected. Therefore, in the present invention, as the thickness T of the dotted thick portion 10 in the joining auxiliary member 6, a thickness in the range of 0.2 mm to 3.2 mm is selected. .
- the distance D between the dotted thick portions 10 in the joining auxiliary member 6 is the thickness when the Al skin 4 is laminated, among the laminated materials, as shown in FIG.
- the appropriate distance is determined depending on the distance between the dotted thick portions 10 and 10, regardless of the thickness when the Al skin material 4 is laminated. If it is less than 2 mm, the rolling force to the point-like thick part 10 becomes weak, and the joining force of the point-like thick part 10 decreases, which is not preferable.
- the distance D between the point-like thick portions 10 and 10 exceeds 13 mm, the shearing force in the rolling direction at the joint of the point-like thick portions 10 becomes strong, and it becomes easy to break. This is not preferable because the effect of preventing sliding of the material to be used becomes poor. For this reason, in the present invention, the distance D between the point-like thick portions 10 and 10 is in the range of 0.2 mm to 13 mm.
- the joining auxiliary member 6 which has such a dotted
- the portion 10 is formed, and the dotted thick portion 10 has a structure in which the portions 10 are arranged at predetermined intervals (D) in two vertical and horizontal directions.
- the wire diameter of the Al wire 8 used here is less than 0.1 mm, the thickness of the formed spot-like thick part 10 is less than 0.2 mm, and the bonding strength of the spot-like thick part 10 is as described above.
- the wire diameter of the Al wire 8 exceeds 1.6 mm, the thickness of the dotted thick portion 10 is reduced to 3.2 mm. Therefore, as described above, the smoothness of the resulting clad material is adversely affected. For this reason, the wire diameter of the Al wire 8 is selected within the range of 0.1 mm to 1.6 mm.
- the shape is obtained by alternately changing the vertical relationship of the Al wire 8 arranged vertically and horizontally.
- a state in which a large number of dotted thick portions 10 are restrained or fixed so that their arrangement positions do not change freely, such as fixed ones or cross points of Al wires 8 arranged vertically and horizontally are joined by crimping or the like.
- weaving such as plain woven wire mesh or twill woven wire mesh using aluminum wire or aluminum alloy wire. A wire mesh will be used.
- the periphery of the joint interface in other words, the outer peripheral portion of the laminate of the material to be clad is formed over the entire periphery in the form leaving one exhaust port.
- the joint interface is depressurized from the exhaust port and sealed, but not only is it troublesome to weld, exhaust and seal, but also in the production of aluminum clad material.
- cracks are likely to occur in the surrounding welds, and external air flows into the joint interface from such cracks, which causes local peeling or blistering. It is.
- a predetermined joining auxiliary member 6 is interposed at the joining interface between the Al core material 2 and the Al skin material 4 to be clad-joined, while the joining interface is in communication with the atmosphere. Therefore, one feature is that the clad rolling is performed without reducing the pressure at the joint interface. Note that the air present at the bonding interface before the clad rolling is gradually discharged as the gap between the bonding materials is reduced and the bonding area is expanded, and finally, the point-like thick portion 10 and the Al that connects it are connected. Although a small amount of air remains in the cell formed by the wire 8 portion, the remaining air is in a small amount and is dispersed at the interface in each cell. It will not be a factor to trigger.
- the first function of the joining auxiliary member 6 used in the method for producing an aluminum clad material according to the present invention is to suppress sliding of the joining interface between the Al core material 2 and the Al skin material 4 to be joined, and
- the second function is to break the oxide film of the Al core material 2 and the Al skin material 4 to promote interfacial bonding.
- the joining auxiliary member 6 itself is also deformed by the rolling force during clad rolling, the oxide film covering the surface of the Al wire 8 constituting the joining auxiliary member 6 is destroyed by such deformation.
- the present invention also has a third function of improving the bondability with the Al core material 2 and the Al skin material 4.
- the strength of the Al wire 8 constituting the joining auxiliary member 6 is equal to or higher than that of the Al core material 2 and the Al skin material 4.
- the strength of the Al wire 8 is more likely to be exhibited when the strength is equal to or less than that of the Al core material 2 and the Al skin material 4.
- the strength of the Al wire 8 is not limited to a specific range, but in order to improve the cladding ratio distribution, it is necessary to suppress the sliding of the bonding interface. It is effective to increase the strength. In that case, since hot clad rolling is generally performed at a temperature of about 450 to 500 ° C., the Al wire 8 is required to have strength at a temperature of about 450 to 500 ° C. is there.
- Mg is the most effective additive element (alloy component) for increasing the high-temperature strength of the Al wire 8. Therefore, in the present invention, aluminum contains 1.5 to 6% by mass of Mg.
- the Al wire 8 made of an Al—Mg-based alloy is preferably used. If the Mg content is less than 1.5% by mass, the effect of improving the strength becomes poor. On the other hand, if the Mg content exceeds 6% by mass, there is a problem that the production of the wire becomes difficult.
- strength improving elements other than Mg include Si, Cu, Mn, and Zn. It is also effective to add and contain at least one of these elements together with Mg. Furthermore, in the present invention, it is also effective to make the Mg content in the Al wire 8 higher than the Mg content in the aluminum or aluminum alloy constituting the Al core material 2 or the Al skin material 4.
- the core material 2 and the skin material are effective to chemically destroy and remove the oxide film on the surface of the Al wire 8 constituting the joining auxiliary member 6 interposed in the interface 4 with an acid solution or an alkali solution.
- This destruction and removal of the oxide film by acid or alkali is generally called an etching process, but in the etching process of the Al wire 8 in the present invention, as in the prior art, hydrofluoric acid, sulfuric acid, phosphoric acid, An aqueous solution of acid or alkali such as sodium hydroxide or potassium hydroxide is typically used, and nitric acid or the like is also used for removing smut generated by etching. A natural oxide film is immediately formed on the surface of the Al wire 8 from which the oxide film has been destroyed and removed by this etching process after such an etching process.
- a laminate obtained by using the joining auxiliary member 6 as described above, and laminating the joining auxiliary member 6 on one side or both sides of the Al core material 2 and laminating them. 12 (see FIG. 3), in other words, it is interposed at the bonding interface between the Al core material 2 and the Al skin material 4, and the bonding interface is communicated with the atmosphere as described above.
- the joining auxiliary member 6, and the skin material 4 are partially fixed at their outer peripheral portions so as to be in a state, hot clad rolling is performed. It is.
- the expansion of the Al core material 2 or the Al skin material 4 in the rolling direction during the clad rolling always occurs toward the rear side with respect to the progressing direction of the rolling.
- partial fixing to the outer peripheral portion of the member 6 and the skin material 4 is adopted, such fixing is performed in a rolling direction (longitudinal direction) with respect to the laminate 12 as shown as a partial fixing point X in FIG. It is desirable to implement by applying partial fixing to both sides of the both ends of each. Further, such partial fixing is performed on both side portions at both ends in a direction (width direction) perpendicular to the rolling direction with respect to the laminate 12, as shown as a partial fixing portion Y in FIG. It is also possible to do. Furthermore, in the present invention, these two partial fixing points X and Y can be formed simultaneously.
- welding is advantageously employed as a means for partially fixing the Al core material 2, the joining auxiliary member 6 and the Al skin material 4 constituting the laminate 12 at their outer peripheral portions.
- the present invention is not limited to this, and a fixing (joining) method using brazing or FSW (friction stir welding), a fastening method using aluminum fittings, or the like can be appropriately employed.
- such partial fixation in the outer peripheral portion is performed in a state where the joining auxiliary member 6 is interposed at the joining interface between the Al core material 2 and the Al skin material 4, and the Al core material 2, the joining auxiliary member 6, and the Al skin material.
- the Al core material 2, the joining auxiliary member 6 and the Al skin material 4 (or the Al core material, the junction) constituting the laminate 12 are used.
- Auxiliary member and Al intermediate material or Al intermediate material, joining auxiliary member and Al skin material) are not fixed to each other, and the laminate 12 is subjected to clad rolling in a form in which the joining interface is communicated with the atmosphere. It is also possible.
- the laminate materials (2, 6, 4) constituting the laminate 12 are in a disjoint state, problems arise in handling in the heating process or the like. It is also possible to start the clad rolling by heating in the form fixed at, and removing the fastening band immediately before the clad rolling and setting it on the rolling roll in an unfixed state. .
- the elongation of the Al skin material 4 or the Al core material 2 can be advantageously suppressed by the presence of the joining auxiliary member 6.
- the skin material 4 Since the core material 2 always stretches in the same direction, depending on the material strength and material configuration, it may be difficult to exert the effect of suppressing the stretching.
- the clad rolling is performed by passing the laminate a plurality of times between the rolling rolls, the rotation directions of the rolling rolls in the odd-numbered pass and the even-numbered pass are opposite to each other. It is desirable to carry out the reverse rolling in which the rolling directions are alternately reversed.
- the rolling direction of the rolling roll is reversed, and the rolling direction of the rolling roll in the odd-numbered and even-numbered passes is reversed so that the rolling proceeds in both directions. It becomes effective.
- rolling is performed at the portion where the Al core material 2 and the joining auxiliary member 6 are in contact with each other and the portion where the joining auxiliary member 6 and the Al skin material 4 are in contact with each other by advancing the clad rolling while being reversed in both the front and rear directions. Since one end side portion and the other end side portion in the direction are joined by receiving a strong reduction force, peeling of the joined portion hardly occurs.
- the joining auxiliary member 6 and the Al skin material 4 is inserted between the upper and lower pair of rolling rolls in an unloaded state,
- the clad rolling is advanced, and each time the laminate 12 passes the rolling roll, the rotation directions of the rolling roll are opposite to each other.
- the method of carrying out reverse rolling is advantageously adopted, and thereby, the stretch suppressing effect of the core material 2 or the skin material 4 is more advantageous as compared with the case where a rolling force is applied during insertion between the rolls. It can be demonstrated.
- the initial load on the laminate can be set by setting the roll gap, but it is desirable to carry out the load control in order to improve the adhesion with high accuracy.
- the position where the load is first applied to the laminate 12 may be any position in the longitudinal direction (rolling direction) of the laminate 12, and in order to further improve the adhesion, particularly in the initial stage of rolling. Alternatively, bidirectional rolling by load control may be repeated.
- the Al core material 2 and the Al skin material 4 which give the aluminum clad material manufactured according to the present invention are both plate-shaped materials made of known aluminum or aluminum alloy, for example, 1000 of JIS name.
- Aluminum alloy and various aluminum alloys of 2000 to 8000 series are used as the material.
- 5000 series of JIS name which has been conventionally difficult to produce clad materials.
- the clad material can be manufactured by using the core material 2 and the skin material 4 made of 6000 series or 7000 series aluminum alloy.
- the aluminum or aluminum alloy employed as the material of the core material 2 and the skin material 4 is appropriately selected according to the use of the aluminum clad material to be manufactured, and is used for, for example, a heat exchanger or the like.
- an Al skin material 4 composed of a brazing material composed of an Al—Si based aluminum alloy is used, and an Al core material 2 composed of an Al—Mn based aluminum alloy or the like is combined therewith, It will be clad rolled.
- the form of the Al core material 2 and the Al skin material 4 constituting the laminate 12 subjected to hot clad rolling is generally a predetermined thickness made of aluminum or an aluminum alloy.
- the Al core material 2 an aluminum slab (thick plate block) made of aluminum or an aluminum alloy is subjected to processing such as chamfering to have a predetermined thickness.
- the plate material obtained by hot rolling the above-described aluminum slab is used.
- the point-like thick portion 10 of the auxiliary joining member 6 that is interposed in the joining interface is thickened within a predetermined range.
- the dotted thick portion 10 in the joining auxiliary member 6 is in a predetermined range. It is also possible to make it thinner.
- the Al skin material 4 used in the present invention is formed of a thick plate cut out from an aluminum slab, and the joint interface thereof is smoothed by machining. Can be used as a skin material.
- hot clad rolling is performed using a laminate 12 in which a joining auxiliary member 6 is interposed between the Al core material 2 and the Al skin material 4, and the Al core material 2 is also used.
- the present invention can also be applied to a laminate in which a plate-like Al intermediate material made of aluminum or an aluminum alloy is interposed between the aluminum skin material 4 and the Al skin material 4.
- a plate-like Al intermediate material made of an Al—Zn-based aluminum alloy that provides a sacrificial anode layer is interposed between an Al core material and an Al skin material for the purpose of improving corrosion resistance.
- the present invention is advantageously applied to the aluminum clad material having such a structure.
- the Al sheet 14 made of an aluminum material having an Mg content of 0 to 0.7% by mass is formed of the above-described joining auxiliary member.
- a method of interposing between the Al core material 2 and the Al skin material 4 and performing hot clad rolling is adopted, in which such an Al sheet is used. Due to the presence of 14, interfacial bonding between the Al core material 2 and the Al skin material 4 is promoted.
- the thickness of the Al sheet 14 is appropriately determined in the range of 5 ⁇ m to 200 ⁇ m according to the thickness of the Al skin material 4 or an Al intermediate material to be described later, the form of the joining auxiliary member, and the like. It will be.
- the thickness of the Al sheet 14 is less than 5 ⁇ m, at the initial stage of the clad rolling, the joining auxiliary member 6 spread on the interface and the rolling reduction corresponding to the thickness of the Al sheet 14 are performed.
- the point-like thick part 10 in the member 6 bites into the Al sheet 14, it is broken and a region without the Al sheet 14 is generated, so that unbonding may occur in part.
- the thickness exceeds 200 ⁇ m the effect of the oxide film destruction of the core material 2 and the skin material 4 by the point-like thick portion 10 in the joining auxiliary member 6 becomes poor, and the joining property may be deteriorated.
- the oxide film of the Al sheet 14 becomes strong, This hinders the joining of the Al core material 2 and the Al skin material 4.
- the other components of the aluminum material that provide the Al sheet 14 are not particularly limited, but the material with lower strength is clad rolled with respect to the skin material, the core material, and the joining auxiliary member as described above. It is more preferable that it is made of pure aluminum or an aluminum material having a purity (aluminum content) of 99% by mass or more because it is immediately pressed strongly and joined.
- the oxide film existing on the surface thereof is subjected to hot clad rolling in the same manner as the oxide film in the Al skin material, Al core material and Al intermediate material described above. In advance, it is effective to chemically destroy and remove with an acid solution or an alkali solution.
- the joining auxiliary member 6 and the Al sheet 14 are interposed at the joining interface between the Al skin material 4 and the Al core material 2.
- a method therefor for example, there is a method of sequentially laminating the Al sheet 14, the joining auxiliary member 6, the Al sheet 14 and the Al skin material 4 in this order on the Al core material 2 to obtain a laminate, Preliminary laminates in which Al sheets 14 are arranged on both sides of the joining auxiliary member 6 are prepared in advance, and this preliminary laminate is laid between the Al skin material 4 and the Al core material 2 and laminated. Get a laminate Technique can also be employed.
- the Al skin material 4 or the Al core material 2 is formed of pure aluminum or an aluminum material having a high bondability with an Al content of 99.0% by mass or more, It is not necessary to arrange the Al sheet 14 on both sides, and the arrangement of the Al sheet 14 between the joining auxiliary member 6 and the Al skin material 4 or the Al core material 2 can be omitted. Further, even when an Al intermediate material described later is formed of pure aluminum or an aluminum material having a high bondability with an Al content of 99.0% by mass or more, the Al intermediate material The arrangement of the Al sheet between the joining auxiliary member 6 and between the Al core material 2 or the Al skin material 4 can be omitted.
- the Al core material 2 and the Al skin material 4 are obtained by interposing an Al sheet 14 disposed on one side or both sides of the joining auxiliary member 6.
- a plate-like Al intermediate made of aluminum or an aluminum alloy between the Al core material 2 and the Al skin material 4 and having a different material from the core material and skin material.
- the present invention can also be applied to a laminate in which at least one material is interposed.
- a plate-like Al intermediate material made of an Al—Zn-based aluminum alloy that provides a sacrificial anode layer is provided between the Al core material 2 and the Al skin material 4 for the purpose of improving corrosion resistance.
- the present invention is advantageously applied to the aluminum clad material having such a configuration.
- an aluminum clad material composed of the Al skin material 4, the Al intermediate material, and the Al core material 2, at least one of the joining interface between the skin material 4 and the intermediate material and the joining interface between the intermediate material and the core material 2.
- the auxiliary joining member 6 according to the present invention is provided with an Al sheet 14 disposed on at least one side thereof, the joining auxiliary member 6 is interposed and hot-rolled, whereby the effect according to the present invention is advantageous. It can be demonstrated.
- this Al intermediate material is composed of a material having high bondability, such as pure aluminum or an Al alloy having an Al content of 99.0% by mass or more and containing no Mg, It is also possible to perform clad rolling without disposing the Al sheet 14 on both sides.
- the laminate obtained by interposing them between the Al skin material 4 and the Al core material 2 is heated.
- the intermediate clad rolling is performed, as described above, the skin 4, the Al sheet 14, and the joining auxiliary member are arranged so that the overlapping surface of the laminate, in other words, the joining interface is in communication with the atmosphere. It is desirable that the hot clad rolling is performed after the 6, the Al sheet 14 and the Al core material 2 are partially fixed at their outer peripheral portions (see FIG. 3) or without being fixed.
- the predetermined joining auxiliary member 6 is clad-rolled in a form in which the predetermined Al sheet 14 is arranged on one side or both sides between the Al skin material 4 and the Al core material 2 as the cladding material.
- the bondability at the interface of the clad material during rolling can be effectively improved, and this makes it possible to produce a clad material that has been difficult to produce in the past. It became possible to design materials that had properties that were difficult to achieve, such as moldability and corrosion resistance.
- the quality improvement effect such as improvement of the clad rate distribution and suppression of blistering can be obtained, the yield of the clad material can be advantageously improved, and the manufacturing cost can be reduced.
- the clad material thus obtained has the above-mentioned characteristics, so that it can be used for various structures such as structures for transport equipment, drive systems and control system parts, multifunctional materials for electronic equipment, and high performance materials for heat exchangers. Wide application is expected in the field.
- the method for producing the aluminum clad material according to the present invention has been specifically described in detail.
- the present invention is not to be construed as being limited in any way by the detailed description of the specific embodiment.
- the present invention can be implemented in a mode with various changes, modifications, improvements, etc., and any such mode can be used without departing from the gist of the present invention. It should be understood that it belongs to the category of the present invention.
- Al ingots made of various aluminum materials (A to I) shown in Table 1 below were prepared in the same manner as in the past by a continuous casting method, and then using the obtained Al ingots.
- An Al core material, an Al intermediate material, and an Al skin material were prepared. That is, for the Al core material, the Al ingot (slab) formed by continuous casting is chamfered in the same manner as in the past, and the thickness is 120 to 198 mm ⁇ width: 200 mm ⁇ length: 300 mm.
- Manufacture, and for Al skins and Al intermediates after each Al ingot is cast, it is hot-rolled to a thickness of 2 to 80 mm, and then cut into dimensions of width: 200 mm x length: 300 mm Was manufactured.
- Al sheet various ingots of aluminum materials (Q to T) shown in Table 1 below were prepared by continuous casting, and the surface of the obtained ingot was chamfered and then thickened.
- Length Hot-rolled to 3 mm, and the end cracked portion was removed to prepare a hot-rolled sheet having a width of 250 mm.
- cold rolling and intermediate annealing were performed, and further cold rolling was performed to 0.3 mm.
- foil rolling was performed to a thickness of 5 to 250 ⁇ m described in Table 10 to Table 12 described later. Then, after annealing, the foil of each thickness was cut into a width: 200 mm and a length: 300 mm to prepare a target Al sheet.
- Al wires having a wire diameter of 0.07 mm to 1.9 mm obtained from various Al alloys (J to P) shown in Table 1 in the same manner as in the past are used.
- Various plain weave wire meshes were used which were used as horizontal lines and intersected vertically and horizontally in a plain weave structure.
- the thickness of the dotted thick portion is 0.14 mm to 3.8 mm according to the wire diameter of the Al wire used,
- a mesh structure is employed in which the vertical and horizontal intervals of the thick part are 0.14 mm to 16 mm.
- Al skin material, Al intermediate material, and joining auxiliary member (plain woven wire mesh) were subjected to surface treatment as required, as follows. That is, the bonding surface of the Al skin material and the Al intermediate material is hot-rolled (however, degreasing treatment with acetone is performed. Etching treatment: none) or alkaline etching treatment (etching treatment with 5% sodium hydroxide aqueous solution) : Yes). Similarly, the joining auxiliary member was subjected to no etching treatment or alkaline etching treatment (etching treatment: present) with a 5% aqueous sodium hydroxide solution.
- Example 1 The various prepared Al core materials, Al intermediate materials, Al skin materials, and joining auxiliary members having dimensions of 200 m ⁇ 300 mm were laminated in the combinations shown in Tables 2 to 4 below, and the obtained laminates Both side portions at both end portions in the length direction were welded by 30 mm in length to fix the laminated materials to each other.
- the laminate was heated to 480 ° C., and hot clad rolling was performed by passing between the rolling rolls a plurality of times. Note that the reduction rate in this hot clad rolling starts from a ratio of 1% with respect to the thickness of the laminate, and the reduction rate is 10% in the tenth pass while increasing the reduction rate sequentially. did.
- hot clad rolling was performed by center rolling which starts rolling from the central part in the longitudinal direction of the laminate. And in any material, thickness: hot-rolling up to 3 mm, cut off the ear cracks at the end, the width: 150-mm hot-rolled plate, further in the cold rolling mill, Thickness: Rolled to 1 mm, and then subjected to softening treatment at 400 ° C. for 2 hours to produce the desired clad material.
- the appearance is inspected, the occurrence of peeling and swelling and the smoothness of the surface are evaluated, and the clad rate of the skin material is measured, Furthermore, comprehensive evaluation was performed, and the results are shown in Tables 5 to 7 below.
- the evaluation of the smoothness of the surface uses a surface roughness meter, and the maximum height when the measurement range is 4 mm and the cut-off value is 0.8 mm along the rolling direction of the clad material after the softening treatment: Rmax was measured, and when this Rmax was 5.0 ⁇ m or less, “ ⁇ ” was given, and those exceeding 5.0 ⁇ m were taken as “x”.
- the cross section of the clad material was observed at 10 points, and the clad rate was calculated from the measurement results of the thickness of the skin material and the thickness of the clad material.
- the clad rate distribution is judged by determining that the variation of the clad rate at 10 points (maximum value-minimum value of the clad rate) is 5% or less of the target clad rate is “ ⁇ ”, exceeding 10% and exceeding 10%. % Or less was rated as “ ⁇ ”, and 10% or more was rated as “x”.
- “ ⁇ ” indicates that there is no problem in all aspects of the presence / absence of peeling of the skin material during rolling, blistering, surface smoothness, and clad rate distribution. It was set as “x”.
- the aluminum clad material No. obtained in accordance with the present invention was obtained.
- any of Nos. 1 to 17 no peeling or swelling was observed, and no problem was caused in the smoothness of the surface.
- the cladding ratio difference between the maximum value and the minimum value of the cladding ratio
- the difference between the maximum value and the minimum value was 1% or less).
- the clad material No. 1 is 0.6%, while the clad material No. 1 obtained by unidirectional rolling up to four passes at the beginning of rolling. Although the difference in the cladding ratio in No. 2 increased to 0.9%, no. Compared with a clad material of 18 or less, the clad rate distribution was uniform, and neither peeling nor blistering was observed.
- no. No. 3 clad material core material: Al—Mg—Si alloy
- No. 3 No. 7 clad material the core material and the skin material are the same material
- No. 7 No. 8 clad material material whose core material is soft and easy to stretch and whose skin material is easy to break
- No. 8 It was confirmed that good results could be obtained even with 9 to 12 clad materials (the core material and the skin material were the same material and the clad rollability was poor).
- no. In the clad materials 9 to 12 the surface treatment (chemical treatment or mechanical treatment) of the core material, the joining auxiliary member, or the skin material is effective.
- the clad material according to No. 12 it was confirmed that a highly uniform clad rate distribution was obtained.
- both the aluminum clad material (No. 13), the aluminum clad material having the intermediate material (No. 14), and the clad material (No. 15) having the heat treatment type alloy as the core material are good. It was confirmed that the result was obtained. Furthermore, the clad material No. 16 or No. 17, the characteristics of the clad material are as follows. 8 or No. Although it was inferior to 12, it was satisfactory in practical use. Therefore, from these results, it is clear that, in addition to the relaxation of the clad rate constraint, according to the present invention, the constraint was relaxed in the materials and configurations that were conventionally difficult to perform clad rolling. .
- No. which is a comparative example.
- the clad material of 18 or less various problems are inherent. That is, the clad material no. In the configuration of 18, 28, 29 (the core material and the skin material are the same material containing high Mg), it is impossible to manufacture without using the joining auxiliary member, and even if the joining auxiliary member is used, the joining auxiliary member However, when it is out of the specified range of the present invention, the quality is deteriorated.
- the degree of difficulty of clad rolling is low, and it was possible to clad roll without using a joining auxiliary member according to the present invention.
- the rate has a difference exceeding 10% with respect to the target value.
- the product can be used as a product, but the yield is greatly deteriorated. .
- the cladding ratio of the skin material is as high as 40%, and the joining auxiliary member is not used, so that the bonding strength at the interface is insufficient, and peeling of the skin material occurs during rolling, so that the clad rolling is performed. It was impossible.
- the clad material No. 25 and no. No. 26 is the same material in which the core material and the skin material are soft.
- a joining auxiliary member since a joining auxiliary member is not used, clad rolling cannot be performed.
- the dotted thick parts of the used joining auxiliary member are thin and the interval between the dotted thick parts is narrow, the grip effect by the joining auxiliary member cannot be effectively exerted, and the leather is peeled off at the end in the rolling direction. As a result, slight peeling of the material occurred, and the difference in the cladding ratio was 14% of the target value.
- both the double-sided aluminum clad material (No. 30) and the aluminum clad material (No. 31) having a heat-treatable aluminum alloy as the Al core material do not use a joining auxiliary member.
- No. 30 causes blistering and poor clad rate distribution.
- No. 31 resulted in a production failure.
- Example 2 From the alloy materials shown in Table 1, a combination of Al skin material: Material A / Al core material: Material E and a combination of Al skin material: Material C / Al core material: Material C are selected. As shown in FIG. 8, two clad materials were manufactured for each combination.
- an ingot formed by continuous casting is chamfered to obtain a thickness: 380 mm ⁇ width: 400 mm ⁇ length: 600 mm, and an Al skin material (a brazing material). ) was hot-rolled to a thickness of 20 mm after casting and cut into dimensions of width: 400 mm ⁇ length: 600 mm.
- a plain woven wire mesh of an Al wire made of an Al—Mg alloy (material N or O) having an Mg content of 4 or 6% by mass, similar to Example 1, is shown in Table 8 below. Used in the configuration.
- the periphery of the boundary (outer peripheral edge portion) between the Al core material and the Al skin material was partially fixed by welding in the same manner as in Example 1, and then predetermined. Heating to temperature, clad rolling was started at a target clad rate of Al skin material: 5%.
- the periphery of the boundary between the Al core material and the Al skin material is welded over the entire circumference, while Al is passed through an exhaust pipe attached by welding to the center of one end in the longitudinal direction.
- Clad rolling was started at 5%.
- an emulsion in which water and oil are generally mixed is used as a lubricant. Therefore, in the clad rolling of this example, an emulsion is used in a conventional manner. .
- the used emulsion enters the interface of the laminated material, it becomes a cause of generating blisters.
- it is effective to discharge the air remaining at the interface with the progress of rolling.
- the Al core material and the Al skin material are used. It is preferable to use partial welding or to perform hot rolling without welding and fixing the clad material No. in Tables 8 and 9. As shown in 32 and 33, it is recognized that in the case where the Al core material and the Al skin material are partially welded and fixed, neither peeling nor blistering occurs, and there is no problem in the smoothness of the surface. .
- the clad material No. in Table 8 and Table 9 As is clear from the study on 34 and 35, all the clad rolling was performed in a state where the periphery of the boundary between the Al core material and the Al skin material was welded over the entire circumference and the joint interface was decompressed, It was observed that bulges were concentrated at the end in the width direction, and bulges were also generated in a part near the center in the width direction. In this way, when the circumference of the laminate is welded all around and the joint interface is depressurized, the high-temperature atmosphere containing oil particles and water vapor rapidly rises from the cracked portion of the weld bead that occurs during hot-clad rolling.
- Example 3 Using the various Al skin materials, Al core materials, joining auxiliary members, Al sheets, and Al intermediate materials prepared above, they were laminated in the combinations shown in Tables 10 to 12 below, and the obtained laminates The portions of each corner having a length of 30 mm in the width direction and the length direction were welded to fix the laminated materials to each other. In addition, by this partial welding fixation, the joint interface of each laminated material is in a state of being in communication with the atmosphere. Thereafter, the laminate was heated to 480 ° C., and hot clad rolling consisting of passing between the rolling rolls a plurality of times was performed.
- the rolling reduction in this hot cladding rolling starts from a ratio of 0.5% with respect to the thickness of the laminate, and the rolling reduction becomes 10% in the tenth pass while increasing the rolling amount sequentially. It implemented as follows.
- the rolling was performed by a reverse rolling method in which the rolling direction was reversed for each pass.
- thickness hot-rolling up to 3 mm, removing the edge cracks at the end, a hot-rolled sheet having a width of 150 mm, and further using a cold rolling mill, thickness:
- the target clad material was manufactured by performing cold rolling to 1 mm and then applying a softening treatment at 400 ° C. for 2 hours.
- Example 2 Each of the various aluminum clad materials after the softening treatment thus obtained was inspected for appearance, and in the same manner as in Example 1, the occurrence of peeling and swelling and the surface smoothness were evaluated. The results are shown in Tables 13 to 14. Each of the obtained clad materials was observed in cross section, and the clad rate of the Al skin material and Al intermediate material was measured in the same manner as in Example 1. The results are also shown in Tables 13 to 14 below. .
- the aluminum clad material No. obtained in accordance with the present invention.
- the clad rolling can be satisfactorily performed up to a thickness of 1 mm, and neither peeling nor blistering is observed, and the surface smoothness and It was recognized that the cladding ratio distribution was excellent.
- an aluminum clad material No. in which a joining auxiliary member or an Al sheet according to the present invention is not interposed between an Al skin material and an Al core material.
- the joining of the Al skin material and the Al core material was not sufficient, and the occurrence of blistering was confirmed.
- the sliding at the interface between the skin material and the core material could not be suppressed, and the clad rate varied greatly.
- an aluminum clad material No. 1 in which only an Al sheet is interposed between the Al skin material and the Al core material.
- the bonding between the skin material and the core material is not sufficient, and the swelling is found in part.
- the aluminum clad material No. 5 is a combination of a skin material and a core material with poor bondability.
- the skin material and the core material could hardly be joined, and greatly increased during hot rolling. Peeling occurred and it was not possible to roll to the end.
- the oxide film of the Al sheet was strong, the joining of the skin material and the core material was hardly possible, peeling occurred during the hot rolling, and the rolling could not be performed to the end.
- the aluminum clad material No. In the case of 55, since the thickness of the dotted thick part of the joining auxiliary member is thick and is 3.8 mm, the presence of minute irregularities is recognized on the surface, and the interval between the dotted thick parts is further increased. Is 16 mm, blisters are partially generated, and a large variation in the cladding ratio is also observed.
- the thickness of the dotted thick part in the joining auxiliary member is 0.14 mm.
- the oxide film of the skin material and the core material is not sufficiently broken, so that the skin material and the core material cannot be effectively joined, and the end portions are peeled off during the hot rolling. As a result, the distribution of the cladding ratio was inferior.
- an aluminum clad material No. 1 using an Al sheet having a thickness of 250 ⁇ m Furthermore, an aluminum clad material No. 1 using an Al sheet having a thickness of 250 ⁇ m.
- the effect of the oxide film destruction at the contact point of the thick portion of the joining auxiliary member is weak, and as a result, peeling of the skin material is caused at both ends in the rolling direction, and the center in the rolling direction is joined. It was confirmed that the bulge also partly in the part, and the distribution of the cladding ratio was inferior.
- the productivity improvement effect and the quality improvement effect of the target aluminum cladding material can be advantageously achieved, thereby greatly increasing the manufacturing cost of the aluminum cladding material. It is understood that it can be reduced to
- an aluminum clad material which has been difficult to manufacture in the past, can be manufactured, and a material having strength, formability, corrosion resistance, and the like can be designed.
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Abstract
Description
上記で準備された各種のAl心材、Al中間材、Al皮材及び200m×300mmの寸法の接合補助部材を、下記表2乃至表4に示される組み合わせにて積層し、その得られた積層物の長さ方向における両端部の両側部を、長さ30mmずつ溶接して、各積層材料を相互に固定せしめた。次いで、かかる積層物を480℃に加熱して、圧延ロール間を複数回パスさせることからなる熱間クラッド圧延を実施した。なお、この熱間クラッド圧延における圧下率は、積層物の厚みに対して1%の比率から開始し、圧下率を順次増大させながら、10回目のパスにおいて圧下率が10%となるように実施した。また、圧延は、1パス毎に圧延方向を反転させるリバース圧延を採用した。また、クラッド材No.2の製造に際しては、最初の4パスを1方向圧延とし、5パス目からリバース圧延を実施する手法を採用し、更にクラッド材No.12においては、積層物の長手方向中央部位から圧下を開始するセンター圧延による熱間クラッド圧延を実施した。そして、何れの材料においても、厚さ:3mmまでの熱間圧延を行い、端部の耳割れ部を切除してなる、幅:150mmの熱間圧延板を、更に冷間圧延機にて、厚さ:1mmまで圧延し、その後、400℃×2時間の軟化処理を施すことにより、目的とするクラッド材の製造を行った。なお、このクラッド材の製造過程において、熱間圧延操作の途中で顕著な皮剥がれを生じたものや、接合界面の未接合によって継続不能となったものにあっては、熱間圧延操作を途中で中止した。
前記表1に示される合金材質の中から、Al皮材:材質A/Al心材:材質Eの組合わせと、Al皮材:材質C/Al心材:材質Cの組合わせを選択し、下記表8に示される如く、各々の組合せについて、2体ずつのクラッド材の製造を実施した。ここで、Al心材については、連続鋳造により造塊した鋳塊を面削して、厚さ:380mm×幅:400mm×長さ:600mmとなったものを使用すると共に、Al皮材(ロウ材)については、鋳造後に20mmの厚さまで熱間圧延して、幅:400mm×長さ:600mmの寸法に切断したものを使用した。また、接合補助部材としては、実施例1と同様な、Mg含有量が4又は6質量%であるAl-Mg合金(材質N又はO)からなるAl線材の平織金網を、下記表8に示される構成において用いた。
上記で準備した各種のAl皮材、Al心材、接合補助部材、Alシート及びAl中間材を用いて、それらを下記表10乃至表12に示される組合せにて積層し、その得られた積層物の各角部における幅方向及び長さ方向のそれぞれ長さ30mmずつの部分を溶接して、各積層材料を相互に固定せしめた。なお、この部分的な溶接固定により、各積層材料の接合界面は、それぞれ大気に連通せしめられてなる状態とされている。その後、かかる積層物を、480℃に加熱して、圧延ロール間を複数回パスさせることからなる熱間クラッド圧延を実施した。なお、この熱間クラッド圧延における圧下率は、積層物の厚みに対して0.5%の比率から開始し、圧下量を順次増大させながら、10回目のパスにおいて、圧下率が10%となるようにして実施した。また、圧延は、1パス毎に圧延方向を反転させるリバース圧延方式にて実施した。何れの材料においても、厚さ:3mmまでの熱間圧延を行い、端部の耳割れ部を削除してなる幅:150mmの熱間圧延板を、更に冷間圧延機にて、厚さ:1mmまで冷間圧延を行い、更にその後、400℃×2時間の軟化処理を施すことにより、目的とするクラッド材の製造を行った。なお、このクラッド材の製造過程において、熱間圧延操作の途中で顕著な皮剥がれを生じたものや、接合界面の未接合によって継続不能となったものにあっては、熱間圧延操作を途中で中止した。
Claims (10)
- アルミニウム若しくはアルミニウム合金からなるAl心材の片面若しくは両面に、アルミニウム若しくはアルミニウム合金からなるAl皮材を重ね合わせて積層せしめ、その得られた積層物を熱間圧延することにより、それらAl心材とAl皮材とを接合、一体化してなるアルミニウムクラッド材を製造するに際して、
アルミニウム若しくはアルミニウム合金からなるAl線材を縦線及び横線として用いて、それらを碁盤目形態に交差させることによって得られた、それら縦線と横線との交差部にて構成される厚さ:0.2~3.2mmの点状厚肉部が、縦横二方向において0.2~13mmの間隔で配置されてなる構造の接合補助部材を、前記Al心材及び前記Al皮材の接合界面に介在せしめて、前記積層物を構成する一方、それらAl心材と接合補助部材とAl皮材とを、それらの外周部において部分的に固定して或いは固定することなく、前記接合界面が大気中に連通されている状態下において、前記積層物の熱間圧延を実施することを特徴とするアルミニウムクラッド材の製造方法。 - 前記接合補助部材の一方の側に又はその両側に、5~200μmの厚さを有し且つMg含有量を0~0.7質量%としたアルミニウム材質のAlシートを配置した形態において、それら接合補助部材とAlシートとを、前記Al心材と前記Al皮材との接合界面に介在させて、前記積層物を構成し、そして該積層物に対して熱間圧延を実施するようにしたことを特徴とする請求項1に記載のアルミニウムクラッド材の製造方法。
- 前記Al線材が、0.1~1.6mmの線径を有していることを特徴とする請求項1又は請求項2に記載のアルミニウムクラッド材の製造方法。
- 前記Al線材が、1.5~6質量%のマグネシウムを含有するAl-Mg系合金にて形成されていることを特徴とする請求項1乃至請求項3の何れか1項に記載のアルミニウムクラッド材の製造方法。
- 前記Al線材が、酸溶液又はアルカリ溶液による処理によって、その表面の酸化膜が化学的に破壊、除去せしめられていることを特徴とする請求項1乃至請求項4の何れか1項に記載のアルミニウムクラッド材の製造方法。
- 前記熱間圧延が、前記積層物を一対の圧延ロール間に複数回パスさせることによって行われると共に、その奇数回目のパスと偶数回目のパスとにおける該圧延ロールの回転方向が互いに逆方向とされて、圧延方向が交互に逆方向となるリバース圧延にて実施されることを特徴とする請求項1乃至請求項5の何れか1項に記載のアルミニウムクラッド材の製造方法。
- 前記積層物を一対の圧延ロール間に無負荷の状態で挿入せしめた後、該積層物に負荷をかけ、次いで該圧延ロールを回転せしめることによって、前記熱間圧延を進行させると共に、該圧延ロールをパスさせる毎に圧延ロールの回転方向が互いに逆方向になるようにして、リバース圧延を実施することを特徴とする請求項1乃至請求項6の何れか1項に記載のアルミニウムクラッド材の製造方法。
- 前記Al心材と前記Al皮材との間に、アルミニウム若しくはアルミニウム合金からなる板状のAl中間材が、更に介在せしめられると共に、該Al心材と該Al中間材との間及び該Al中間材と該Al皮材との間の少なくとも何れか一方の間に、前記接合補助部材が配置されて、それらAl心材、Al中間材、接合補助部材及びAl皮材が、それらの外周部において部分的に固定されて或いは固定されることなく、前記積層物が構成されていることを特徴とする請求項1乃至請求項7の何れか1項に記載のアルミニウムクラッド材の製造方法。
- 前記Al心材と前記Al皮材との間に、アルミニウム若しくはアルミニウム合金からなる板状のAl中間材が、更に介在せしめられると共に、該Al心材と該Al中間材との間及び該Al中間材と該Al皮材との間の少なくとも何れか一方の間に、前記接合補助部材が、その少なくとも一方の側に、5~200μmの厚さを有し且つMg含有量を0~0.7質量%としたアルミニウム材質のAlシートを配置せしめてなる形態において、介在せしめられて、前記積層物が構成されていることを特徴とする請求項2乃至請求項7の何れか1項に記載のアルミニウムクラッド材の製造方法。
- 前記Alシートが、純アルミニウム又はアルミニウム含有量が99.0質量%以上のアルミニウム材質にて構成されている請求項2又は請求項9に記載のアルミニウムクラッド材の製造方法。
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