JP6247593B2 - Method for producing aluminum clad material - Google Patents

Description

  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.

  The aluminum clad material is composed of one or both surfaces of an Al core material and an Al skin material of a different material from the Al core material, or depending on the application, between the core material and the skin material. In a form in which an Al intermediate material made of aluminum or aluminum alloy of different materials is interposed, they are superposed to form a multilayer structure (laminate), and such a laminate is heated to a predetermined temperature. The plate material obtained by hot rolling and then cold rolling to a predetermined plate thickness. And about this kind of aluminum clad material, various manufacturing methods have been proposed conventionally, and it has actually been used as a brazing sheet or the like in a heat exchanger for transportation equipment such as aircraft and automobiles. However, many problems to be solved still remain in the conventional method for producing an aluminum clad material.

  Specifically, the bonding at the interface of the laminate subjected to the above hot clad rolling is generally referred to as pressure welding, which means that bonding is performed by applying a strong pressure at a high temperature. In that case, since the surface of each laminated material, such as Al core material and Al skin material, is covered with the oxide film, it is necessary to destroy the oxide film for joining them. Therefore, by applying a strong pressure in the direction perpendicular to the joining surface by hot clad rolling, the oxide film cannot be effectively destroyed, and it is difficult to join. It is generally recognized that it is necessary to break the oxide film by sliding the interface of these laminates.

Actually, in a clad material having a high clad rate of the skin material, sliding hardly occurs at the interface between the core material and the skin material, and it is difficult to join them. On the other hand, in the case of a clad material having a low clad rate, the temperature of the skin material is lowered before hot clad rolling, and the oxide film is not easily destroyed. There is a problem that a rolling failure is likely to occur due to tearing or the like. For this reason, it is the actual situation that the clad rate of the aluminum clad material is generally limited to a range of 5 to 25% due to such manufacturing problems. Furthermore, in the JIS name 5000 series, 6000 series, or 7000 series Al alloys containing a large amount of magnesium (Mg), in addition to aluminum oxide (Al ₂ O ₃ ), magnesium oxide (MgO ) Is also formed, so that the oxide film becomes strong, and it has been considered difficult to produce a clad material using such an aluminum core material or skin material. .

  By the way, conventionally, in order to improve the bondability at the interface of the aluminum clad material, in Japanese Patent Application Laid-Open No. Sho 62-227504, a bonding material layer made of a pure aluminum material having good adhesion and an aluminum alloy having excellent strength are used. A material for laminating and rolling, in which the reinforcing material layers are laminated and integrated, has been proposed, and two sheets of the laminating rolling material are overlapped with each bonding material layer facing each other, and then laminating (cladding rolling) ), It is clarified that a clad material in which a reinforcing material layer is integrated on both sides thereof can be obtained through a bonding material layer while maintaining the adhesiveness between materials equally. Yes. Japanese Patent Laid-Open No. 62-38782 discloses a clad material to be clad when clad rolling an Al alloy skin material having a Mg content of 3.5% or more and another Al alloy core material. Using a layer having a pure Al layer corresponding to at least 5% of the thickness of the skin material on the surface facing the core material, the skin material and the core material are clad rolled through this pure Al layer, thereby producing Al. -It has been shown that cladding of Mg alloy skin can be achieved reliably.

  However, as a result of various investigations by the present inventors regarding these conventional bondability improving techniques, the bonding interface can be sufficiently bonded, particularly in the case of clad rolling an Al skin material or an Al core material containing a large amount of Mg. However, problems such as peeling of the skin material and the core material in the middle of rolling are still inherent, and the effects shown in those patent documents cannot be sufficiently obtained. It became clear that there was no. In addition, even when clad rolling was possible, it was confirmed that the clad material obtained there had problems such as blistering.

JP 62-227504 A JP 62-38782 A

  Here, the present invention has been made in the background of such circumstances, the problem to be solved is that it is possible to improve the bondability of the interface of the aluminum clad material, as a result of the clad material An object of the present invention is to provide an improved manufacturing method of an aluminum clad material that realizes an improvement in quality and that also makes it possible to produce a clad material of a combination that is difficult to manufacture with the prior art.

  Therefore, the present inventors have intensively studied to solve such problems, and as a result, in the production of aluminum clad material, at the intersecting portions of the material extending in the vertical direction and the horizontal direction, a point-like shape having a predetermined thickness is obtained. Aluminum material having a thick-walled portion and using a mesh-structured aluminum or aluminum alloy joining auxiliary member and containing no Mg on one or both sides, or an Mg content of 0.7% by mass or less In the form in which the Al sheet is arranged, the joining auxiliary member and the Al sheet are clad-rolled so that the joining auxiliary member and the Al sheet are interposed at the joining interface between the Al core material and the Al skin material. In addition to improving the quality of the clad material, it is possible to effectively improve the bondability at the interface of the clad material. Even, it was found that stable production is possible.

  And in this invention, it was completed based on this knowledge, The place made into the summary is Al or aluminum which consists of aluminum or aluminum alloy on one side or both sides of Al core material which consists of aluminum or aluminum alloy. When producing an aluminum clad material in which the Al core material and the Al skin material are joined and integrated by hot rolling the obtained laminate, and laminating the obtained laminate, in both the vertical and horizontal directions A plurality of point-like thick parts having a thickness of 0.2-3.2 mm, which are arranged at intervals of 0.2-13 mm in FIG. A joining auxiliary member made of aluminum or aluminum alloy in which a network structure is formed from a connecting portion that is thinner than the thick-walled portion. In a form in which an aluminum sheet made of aluminum having a thickness of 5 to 200 μm and an Mg content of 0 to 0.7 mass% is arranged on one side or both sides of the joining auxiliary member, these joining aids A member and an Al sheet are interposed at a bonding interface between the Al core material and the Al skin material to constitute the laminate, and hot rolling is performed on the laminate. There is a method for producing an aluminum clad material.

  In addition, according to one of the preferable aspects of the manufacturing method of the aluminum clad material according to this invention, the said joining auxiliary member uses the Al wire material of wire diameter: 0.1-1.6mm as a vertical line and a horizontal line, respectively. It is comprised and the said dotted | punctate thick part is formed in the intersection of these vertical lines and horizontal lines.

  Moreover, according to another one of the preferable aspects of the manufacturing method of the aluminum clad material according to this invention, the said joining auxiliary member is formed with the aluminum alloy containing 1.5-6 mass% Mg.

  Further, in the present invention, the Al sheet is advantageously made of pure aluminum or an aluminum material having an aluminum content of 99.0% by mass or more.

  Furthermore, in another desirable aspect of the method for producing an aluminum clad material according to the present invention, the bonding auxiliary member is chemically destroyed by treatment with an acid solution or an alkali solution, so that the oxide film on the surface thereof is chemically destroyed. , Have been removed.

  In addition, according to still another desirable aspect of the method for producing an aluminum clad material according to the present invention, 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. Is interposed between the Al core material and the Al intermediate material and at least one of the Al intermediate material and the Al skin material. The laminate is formed by interposing the Al sheet in a form in which the Al sheet is disposed on the side of the laminate.

  Thus, in the manufacturing method of the aluminum clad material according to the present invention, the Mg content is 0 on one side or both sides of the joining auxiliary member in which the predetermined point-like thick portion is formed at the intersection of the network structure. In a form in which ~ 0.7 mass% Al sheet is arranged and intervened at the interface between the Al core material and the Al skin material, clad rolling is performed. Based on the function, while effectively realizing the destruction of the oxide film formed on the surface of the material to be joined, the interfacial joining between the Al core material and the Al skin material is facilitated and further promoted. It was possible to make an advantage.

  That is, in the present invention, the joining auxiliary member formed with a predetermined point-like thick portion has a function of destroying the oxide film present on the surface of the Al core material, the Al skin material, and the Al sheet disposed on both sides thereof. In addition, the Al sheet disposed on one 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. It is. And according to such a configuration of the present invention, in the initial stage of clad rolling, the load is concentrated at the contact point between the point-like thick part of the joining auxiliary member and the Al skin material or Al core material via the Al sheet. In addition, since a strong rolling force is applied, even in the case of a skin material or a core material having a high Mg content, the oxide film of the skin material or the core material is effectively destroyed at the contact point. The destruction of the oxide film proceeds from the contact point as a starting point due to the shear force generated at the boundary between the contact point and the other part. 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. Furthermore, since the Al sheet is composed of a soft Al material having an Mg content of 0 to 0.7 mass%, the exposed Al skin material and the Al core material with the progress of the destruction of the oxide film described above, The metal surfaces with the Al sheet were immediately strongly pressed against each other and joined together. In addition, between the joining auxiliary member and the Al sheet, the exposed metal surfaces are immediately strongly pressed and joined in the same manner as described above.

  On the other hand, as in the conventional manufacturing method, if only the Al sheet is laid on the bonding interface between the Al skin material and the Al core material, the function to promote the destruction of the oxide film of the skin material and the core material cannot be obtained. Although the exposure of the metal surface of each member is not sufficient and it becomes difficult to ensure that the bonding is performed uniformly, according to the present invention, by using a specific bonding auxiliary member and an Al sheet, the above-described is used. Based on the function, even a clad material (Al skin material or Al core material) having a high Mg content, which has been difficult to manufacture in the past, can be easily clad rolled. In addition, since 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.

  And, according to the present invention, since the progress of the joining is uniformly expanded starting from the point-like thick part, it is a frequent problem in the conventional hot rolling process, due to wide area unjoining. The occurrence of peeling and blistering due to unbonding of the skin material that occurs locally can be effectively suppressed, and the improvement of the quality of the clad material of the conventional clad material can be effectively achieved. You will get.

  Therefore, by adopting the method for producing an aluminum clad material according to the present invention, it is possible to advantageously improve the interface bondability between the laminated materials of the aluminum clad material. In addition to making it possible to produce a clad material of clad material, the quality improvement of the clad material such as suppression of blistering and improvement of the clad rate distribution could be advantageously achieved.

  Here, the present invention is first clad using a joining auxiliary member made of aluminum or aluminum alloy having a flat shape, in which a point-like thick portion is formed at the intersection of the network structure. One major characteristic is that clad rolling is performed between the power Al skin material and the Al core material. That is, the oxide film formed on the surface of the laminated material such as the Al skin material or the Al core material when a strong rolling force is applied during clad rolling by the joining auxiliary member having such a structure. Fracture progresses starting from the point of contact with the point-like thick part in the joining auxiliary member, thereby effectively improving the bondability at the interface between the target aluminum clad laminates. You will get.

  On the other hand, unlike such a joining auxiliary member according to the present invention, a mesh member having a structure having no point-like thick portion, for example, a punching metal of an aluminum plate (a circular or rectangular hole in a mesh shape). When using a member such as an open plate material) and interposing it between the Al skin material to be joined and the Al core material and performing clad rolling, the reduction force is exerted on the entire mesh member (punching metal). Since the oxide film is not sufficiently broken because it comes to receive evenly, the skin material and the core material cannot be reliably joined via the mesh member, and in many cases, such a mesh member is used. As in the case of not interposing, the Al skin material or the Al core material becomes elongated.

  By the way, as thickness of the dotted | punctate thick part in a joining auxiliary member used in this invention, within the range of 0.2 mm-3.2 mm, the thickness at the time of lamination | stacking of Al skin material, Al skin material, and Al It is determined appropriately according to the material of the core material. When the thickness of the spot-like thick part is less than 0.2 mm, the oxide film of the skin material and the core material, and further the oxide film of the Al sheet are destroyed at the contact point of the spot-like thick part as described above. There is a problem that it is difficult to sufficiently perform the bonding because it becomes difficult to sufficiently exhibit the effect. Further, when the thickness of the point-like thick part exceeds 3.2 mm, the biting into the Al skin material increases, which may cause a problem in the smoothness of the surface of the obtained clad material.

  In addition, the interval between the dotted thick portions in the joining auxiliary member according to the present invention is appropriately selected mainly depending on the thickness of the Al skin material when laminated, the material of the Al skin material and the Al core material, and the like. However, regardless of them, it is desirable that the point-like thick portions are connected to each other in the vertical and horizontal directions on the plane at intervals of 0.2 mm to 13 mm and held in a fixed position, Further, the thickness of the connecting portion is configured so as to be thinner than the point-like thick portion in order to advantageously exhibit the function of destroying the oxide film described above. When the distance between the point-like thick parts is less than 0.2 mm, the rolling force to the point-like thick parts becomes weak, so that the oxide film cannot be sufficiently broken at the contact points. There is a risk of insufficient bonding. Further, when the distance between the dotted thick portions exceeds 13 mm, the starting point at which the oxide film is destroyed is reduced, and thus there is a possibility that an unjoined portion is generated. In addition, when such a dotted thick part is scattered independently without being connected, the position of the dotted thick part at the time of installing the joining auxiliary member and the Al sheet or in the initial stage of rolling. Is moved and becomes an interval outside the range defined in the present invention, it becomes difficult to sufficiently destroy the oxide film, unjoined parts are generated, the skin material is bulged, or during rolling There is a risk of causing problems such as peeling of the skin material. For this reason, the dotted | punctate thick part of a joining auxiliary member is made into the state mutually connected, and it is comprised so that the space | interval may not change easily between adjacent dotted | punctate thick parts.

  And in this invention, as long as the joining auxiliary member which has such a dotted | punctate thick part consists of pure aluminum or an aluminum alloy, the composition will not be specifically limited, but the oxide film mentioned above is destroyed. In order to increase the function advantageously, the strength of the joining auxiliary member is preferably equal to or higher than that of the Al core material or the Al skin material. In general, since hot clad rolling is performed at a temperature of 450 to 500 ° C., in the temperature range of 450 to 500 ° C., the joining auxiliary member is made of Al core material or Al skin material. On the other hand, the same or higher strength is required. Here, since Mg is the most effective additive element for increasing the high temperature strength of aluminum, in the present invention, 1.5 to 6% by mass of Mg is used as a material for forming a joining auxiliary member. An aluminum alloy containing is preferably used. When the Mg content is less than 1.5% by mass, the effect of improving the strength is poor, and when the Mg content exceeds 6% by mass, there arises a problem that it becomes difficult to manufacture the joining auxiliary member. Further, in the aluminum alloy that gives the joining auxiliary member, as other elements, Si: 0.4 mass% or less, Fe: 0.6 mass% or less, Cu: 0.2 mass% or less, Mn: 1.0 mass % Or less and Zn: 0.25 mass% or less may be contained. Furthermore, in the present invention, it is also effective to make the Mg content in the aluminum material constituting the joining auxiliary member larger than the Mg content in the aluminum or aluminum alloy constituting the Al core material or Al skin material. . Furthermore, a joining auxiliary member can be formed using a JIS 2000 series aluminum alloy to which Cu is added as a strength improving element other than Mg or a JIS 7000 series aluminum alloy to which Zn is added.

  Moreover, as one specific form of the joining auxiliary member having such a point-like thick part according to the present invention, aluminum wire made of aluminum or aluminum alloy is used as vertical lines and horizontal lines, and they have a grid pattern form. It is possible to cite what is constructed by arranging them so as to form, where the above-mentioned dotted thick part is formed at the intersection of the vertical and horizontal lines, and further, A point-like thick part is arranged at predetermined intervals in two vertical and horizontal directions and exhibits a connected structure. When the wire diameter of the Al wire used here is less than 0.1 mm, the thickness of the dotted thick portion formed is less than 0.2 mm, and the effect of destroying the oxide film as described above is hardly exhibited. In addition, there is a problem that the joining is difficult to be performed sufficiently. Moreover, when the Al wire rod diameter exceeds 1.6 mm, the thickness of the dotted thick portion exceeds 3.2 mm. There is a possibility that the bite of the clad increases and causes a problem in the smoothness of the surface of the clad material. For this reason, the wire diameter of the Al wire is selected in the range of 0.1 mm to 1.6 mm.

  By the way, as a more specific form of the joining auxiliary member constituted by using such an Al wire as a vertical line and a horizontal line, for example, the shape is fixed by alternately changing the vertical relation of the Al wire arranged vertically and horizontally. In the state where the arrangement position is fixed or fixed so that the arrangement position of a large number of point-like thick parts does not change freely, such as the one and the intersection of Al wires arranged vertically and horizontally, etc. Examples include a structure in which the vertical and horizontal directions are distributed at predetermined intervals, but practically, a woven wire mesh such as a plain woven wire mesh or a twill woven wire mesh using an aluminum wire or an aluminum alloy wire is advantageous. Will be used. In addition, as described above, a general punching metal structure is difficult to adopt in the present invention because it receives a rolling force evenly, but a vertical and horizontal connection portion of aluminum punching metal (in two vertical and horizontal directions, Any material having a structure with a predetermined thickness of a material corresponding to an aluminum material made of aluminum or an aluminum alloy in a portion surrounded by four adjacent holes) is also used in the present invention. And the effects of the present invention can be exhibited.

  Another feature of the present invention is that the Al sheet made of an aluminum material having an Mg content of 0 to 0.7% by mass is arranged on at least one side of the above-described joining auxiliary member. It is to intervene between the Al skin material and the Al core material and perform hot clad rolling, and the presence of such an Al sheet promotes interfacial bonding between the Al skin material and the Al core material. It is in doing so. In addition, the thickness of the Al sheet is appropriately determined in the range of 5 μm to 200 μm, depending on the thickness of the Al skin material or the Al intermediate material to be described later and the form of the joining auxiliary member. Become. When the thickness of the Al sheet is less than 5 μm, at the initial stage of the clad rolling, the joining auxiliary member spread on the interface and the rolling of the rolling amount corresponding to the thickness of the Al sheet are performed. When the thick-walled portion breaks into the Al sheet and a region without the Al sheet is generated, there is a possibility that unbonding occurs in part. Further, when the thickness exceeds 200 μm, the effect of destroying the oxide film of the skin material or the core material by the dotted thick portion in the joining auxiliary member becomes poor, and the joining property may be lowered.

  When the Mg content of the aluminum material constituting the Al sheet exceeds 0.7% by mass, in addition to the strength of the Al sheet increasing, the oxide film of the Al sheet becomes stronger, and the Al skin material And hinders the joining of Al core material. The other components of the aluminum material that provides this Al sheet are not particularly limited, but the material with lower strength is used for clad rolling, core material, and auxiliary joining member during clad rolling 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.

  In order to further improve the functions of the joining auxiliary member and the Al sheet as described above, the oxide film on the surface of the joining auxiliary member and the Al sheet is heated together with the oxide film on the Al skin material, the Al core material, and the Al intermediate material. Prior to the intermediate clad rolling, it is effective to chemically destroy and remove with an acid solution or an alkali solution. This destruction / removal of the oxide film with an acid solution or an alkali solution is generally called an etching process, but in the etching process for the joining auxiliary member and the Al sheet in the present invention, hydrofluoric acid, sulfuric acid, phosphorus An acid or alkali aqueous solution such as acid, sodium hydroxide, or potassium hydroxide is typically used, and nitric acid or the like is also used for removing smut generated by etching. The surface of the joining auxiliary member from which the oxide film is destroyed and removed by this etching process is immediately formed with a natural oxide film after such an etching process. Compared with oxide film, it is thin and brittle, so it is easily broken by the rolling force during hot clad rolling. In addition, it is possible to improve the bondability with the Al skin material. The necessity of such etching treatment is appropriately determined depending on the material and state of the material to be clad rolled. For example, in the case of a material made of an aluminum material having an aluminum content of 99% by mass or more, In the case of an Al core material that is subjected to chamfering, an Al skin material that is chamfered, and an Al intermediate material, the etching process may be unnecessary.

  By the way, the Al skin material and the Al core material, which are hot-clad rolled using the joining auxiliary member and the Al sheet according to the present invention, are both plate-shaped materials made of known aluminum or aluminum alloy. For example, JIS name 1000 series aluminum and 2000 series to 8000 series aluminum alloys are used as the material, but in the present invention, it is conventionally difficult to produce a clad material. The clad material can be manufactured by using the core material or the skin material made of the JIS name 5000 series, 6000 series, or 7000 series aluminum alloy. In such an aluminum material, different materials are selected for the Al skin material and the Al core material. Further, aluminum or aluminum alloy employed as the material of the core material or skin material is appropriately selected according to the intended use of the aluminum clad material, and for example, a brazing sheet used in a heat exchanger or the like In this case, an Al skin material composed of a brazing material composed of an Al—Si based aluminum alloy is used, and this is combined with an Al core material composed of an Al—Mn based aluminum alloy or the like and clad rolled. It will be.

  Further, in the production of an aluminum clad material according to the present invention, the form of the Al skin material or Al core material constituting the laminate subjected to hot clad rolling is generally a predetermined thickness made of aluminum or an aluminum alloy. A plate-like material is used. For example, as an Al core material, an aluminum slab (thick plate-like block) made of aluminum or an aluminum alloy is subjected to a process such as chamfering to obtain a predetermined thickness. In the case of the Al skin material, a plate material obtained by hot rolling the above-described aluminum slab is used. In addition, when the flatness of the hot-rolled sheet material for the Al skin material is poor, the point-like thick part of the joining auxiliary member interposed at the joining interface is made thicker within a predetermined range. In addition to exhibiting a clear effect, if the joining interface of the hot-rolled sheet material for Al skin material is smoothed by machining, the dotted thick part in the joining auxiliary member is It is also possible to make it thin within the range.

  Furthermore, as another form of the Al skin material used in the present invention, it is formed of a thick plate cut out from an aluminum slab, and the joint interface is smoothed by machining, It can be used as a skin material.

  Here, in common with the Al skin material and the Al core material, in addition to machining, it is also possible to adopt a technique of artificially providing irregularities by brushing with a metal brush in addition to machining. In addition, if possible in terms of equipment, it is also possible to perform an etching process in the same manner as in the case of the joining auxiliary member described above. In any case, the surface oxide film of the Al skin material or the Al core material is destroyed by processing before rolling or artificially provided with unevenness to increase the sliding resistance. It is effective in making it show.

  Then, according to the present invention, when the clad rolling of the predetermined Al skin material and the Al core material is performed using the above-described joining auxiliary member and the Al sheet, an Al sheet is provided on one side or both sides of the joining auxiliary member. In the arranged form, the joining auxiliary member and the Al sheet are interposed at the joining interface between the Al skin material and the Al core material. As a method for that purpose, for example, on the Al core material There is a method of sequentially laminating an Al sheet, a joining auxiliary member, an Al sheet, and an Al skin material in this order to obtain a laminate, and a preliminary laminate comprising Al sheets arranged on both sides of the joining auxiliary member in advance. It is also possible to employ a method of preparing and laminating the preliminary laminate between the Al skin material and the Al core material to obtain a laminate. In addition, when the Al skin material or the Al core material is formed of pure aluminum or an aluminum material having a high bondability with an Al content of 99.0% by mass or more, Al is provided on both sides of the joining auxiliary member. There is no need to arrange the sheet, and it is possible to omit the arrangement of the Al sheet between the joining auxiliary member and the Al skin material or the Al core material. 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 and between the Al skin material or the Al core material can be omitted.

  Further, in the present invention, using a laminate obtained by interposing an Al sheet disposed on one side or both sides of a joining auxiliary member between an Al skin material and an Al core material, In addition to clad rolling, at least one of a plate-like Al intermediate material made of aluminum or an aluminum alloy and having a different material from the skin material or core material is interposed between the Al skin material and the Al core material. The present invention can also be applied to a laminate. For example, in an aluminum clad material for a heat exchanger, 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 skin material and an Al core material for the purpose of improving corrosion resistance. However, the present invention is advantageously applied to the aluminum clad material having such a configuration. In such an aluminum clad material composed of an Al skin material, an Al intermediate material, and an Al core material, at least one of the bonding interface between the skin material and the intermediate material and the bonding interface between the intermediate material and the core material, The joining auxiliary member according to the present invention is interposed between the Al sheets on at least one side thereof and hot-clad rolled so that the effect according to the present invention can be advantageously exerted. . When the Al intermediate material is made of a material having high bondability such as pure aluminum or an Al alloy containing Al of 99.0% by mass or more and containing no Mg, both sides of the Al intermediate material It is also possible to perform clad rolling without arranging an Al sheet.

  And according to the present invention, in a form in which an Al sheet is arranged on one side or both sides of the joining auxiliary member, a laminate obtained by interposing them between the Al skin material and the Al core material is hot-clad rolled. At that time, such a laminate, an Al sheet, a joining auxiliary member, an Al sheet, and an Al core so that the laminated surface of the laminate, in other words, the joining interface is in communication with the atmosphere, It is desirable to perform hot clad rolling after partially fixing at the outer peripheral portion or without fixing.

  Therefore, for example, as a means for partially fixing the Al skin material, the Al sheet, the joining auxiliary member, the Al sheet, and the Al core material that constitute such a laminate at the outer peripheral portion thereof, generally welding is performed. However, it is not limited to this, but a fixing (joining) method using brazing or FSW (friction stir welding), a fastening method using aluminum fittings, or the like can be employed as appropriate. In addition, such partial fixing at the outer peripheral portion is such that the bonding interface is partially formed at a part of the outer peripheral portion with a bonding auxiliary member and two Al sheets interposed in the bonding interface between the Al skin material and the Al core material. This is performed on a portion including at least a portion where the peripheral edge portion is located, whereby the joining interface is configured to be communicated with the outside atmosphere except for the fixing portion. Further, such partial fixing at the outer peripheral portion is similarly performed even when a predetermined Al intermediate material is interposed between the Al skin material and the Al core material, and the Al skin material, the Al sheet, and the joining auxiliary member. Applied between the Al sheet and the Al sheet and between the Al sheet, the Al sheet, the auxiliary bonding member, the Al sheet and the Al core material, and the respective bonding interfaces are communicated with the outside atmosphere. In this embodiment, clad rolling is performed.

  In the present invention, instead of partial fixing in the laminate as described above, for example, an Al skin material, an Al sheet, a joining auxiliary member, an Al sheet, and an Al core material (or Al skin material, Al sheet, auxiliary bonding member, Al sheet and Al intermediate material, or Al intermediate material, Al sheet, auxiliary bonding member, Al sheet and Al core material) are fixed to each other without fixing them to the atmosphere. It is also possible to subject the laminate to clad rolling under the form of communicating with each other. However, in the state where each laminate material constituting the laminate is in a state of being separated, a problem arises in handling in the heating process or the like. For example, in a form in which the laminate is fixed with an appropriate fastening band. It is also possible to perform heating and remove the fastening band immediately before the clad rolling and set it on the rolling roll in an unfixed state to start the clad rolling.

  As described above, according to the present invention, a predetermined joining auxiliary member is clad-rolled in a form in which a predetermined Al sheet is disposed on one side or both sides between an Al skin material which is a cladding material and an Al core material. Thus, 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. Further, since 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. And, the clad material obtained according to the present invention is given the characteristics as described above, the structure of transport equipment, drive system and control system parts, multifunctional materials for electronic equipment, high performance materials for heat exchangers, etc. Wide application is expected in many fields.

  As mentioned above, although various embodiments of the manufacturing method of the aluminum clad material according to the present invention have been described, the present invention is not to be interpreted in any limited manner by the detailed description according to such specific embodiments. The present invention can be practiced in various modifications, corrections, improvements, and the like based on the knowledge of those skilled in the art, and such implementations do not depart from the spirit of the present invention. It should be understood that both belong to the category of the present invention.

  Hereinafter, some examples of the present invention will be shown and the present invention will be more specifically clarified, but the present invention is not limited by the description of such examples. That should also be understood.

  First, Al ingots made of various aluminum materials (A to G) shown in Table 1 below were prepared in the same manner as before by a continuous casting method, and then the obtained Al ingot was used. 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 160 to 198 mm × width: 200 mm × length: 300 mm. Manufactures and after the casting of each Al ingot, the Al skin material and the Al intermediate material are hot-rolled to a thickness of 2 to 20 mm, and then cut into dimensions of width: 200 mm × length: 300 mm Was manufactured.

  For the Al sheet, various ingots of aluminum materials (M to P) shown in Table 1 below were prepared by continuous casting, and the surface of the resulting ingot was chamfered, and then the thickness was reduced. 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. Subsequently, cold rolling and intermediate annealing were performed, and further cold rolling was performed to 0.3 mm. Then, foil rolling was performed to the thickness of Table 2 thru | or Table 4: 3-250 micrometers. Then, after annealing, the foil of each thickness was cut into a width: 200 mm and a length: 300 mm to produce a target Al sheet.

  Furthermore, as a joining auxiliary member, the Al wire (0.07 mm to 1.9 mm) obtained in the same manner as before using the respective Al alloys (HL) is used as the vertical and horizontal lines. Thus, various plain weave wire meshes were prepared which intersected in the horizontal and vertical directions in the plain weave structure. In addition, according to the wire diameter of the Al wire material used, such a plain woven wire mesh has a point-like thick portion having a thickness of 0.14 mm to 3.8 mm. A mesh structure is employed in which the vertical and horizontal intervals of the thick portion are 0.14 mm to 16 mm.

  And about the Al skin material and joining auxiliary member (plain woven wire mesh) of each obtained material, the surface treatment was implemented as follows as needed. 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.

  Next, using such various Al skin materials, Al core materials, joining auxiliary members, Al sheets and Al intermediate materials, they were laminated in the combinations shown in Tables 2 to 4 below, and the obtained laminations Each of the corners of the object was welded at 30 mm portions in the width direction and the length direction 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. In any material, 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. In addition, in the manufacturing process of this clad material, in the case where there has been noticeable peeling during the hot rolling operation, or in the case where it has become impossible to continue due to unbonding of the bonding interface, the hot rolling operation is in progress. Canceled.

  And, for each of the various aluminum clad materials obtained in this way, 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 6 below. In addition, 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 μm or less, “◯” was given, and those exceeding 5.0 μm were taken as “x”. Further, 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 “◎” and exceeds 5% and exceeds 10%. % Or less was rated as “◯”, and 10% or more was rated as “x”. Furthermore, as a comprehensive evaluation, “○” 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”.

  As is apparent from the results in Tables 2 to 4 and Tables 5 to 6, the aluminum clad material No. 1 obtained according to the present invention was obtained. 1 to 14, regardless of the clad rate, the clad rolling can be performed well up to a thickness of 1 mm, and neither peeling nor blistering is observed, and surface smoothness and It was recognized that the cladding ratio distribution was excellent.

  On the other hand, the aluminum clad material No. in which the joining auxiliary member and the Al sheet according to the present invention are not interposed between the Al skin material and the Al core material. In the case of 15, the joining of the Al skin material and the Al core material was not sufficient, and the occurrence of swelling was confirmed. In addition, it was found that the sliding at the interface between the skin material and the core material could not be suppressed, and the clad rate varied greatly. Further, an aluminum clad material No. 1 in which only an Al sheet is interposed between the Al skin material and the Al core material. In the case of No. 16, the bonding between the skin material and the core material is not sufficient, and the swelling is found in part. As in the case of the aluminum clad material No. 15, the clad ratio varies widely and the combination of materials with poor bondability is obtained. In the case of 17, since only Al sheet was laid and rolled between the skin material and the core material, the skin material and the core material could hardly be joined, and it was greatly increased during hot rolling. Peeling occurred and it was not possible to roll to the end.

  Moreover, aluminum clad material No. in which the Mg content of the Al sheet is 0.8 mass%. In the case of 18, 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 19, 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. On the other hand, the aluminum clad material No. 1 in which the thickness of the dotted thick part in the joining auxiliary member is 0.14 mm. In the case of 20, 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 joined, and peeling occurs during the hot rolling, and the rolling is performed to the end. I could not do it.

Further, an aluminum clad material No. 3 using an Al sheet having a thickness of 3 μm is used. In the case of No. 21, an unjoined part was caused at a part of the interface between the Al skin material and the Al core material, and blistering occurred. In contrast, aluminum clad material No. 1 using an Al sheet having a thickness of 250 μm. In the case of No. 22, 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 bulges were also generated in some parts.

Claims (6)

An Al core material made of aluminum or an aluminum alloy is laminated on one or both surfaces of an aluminum core material made of aluminum or aluminum alloy, and the resulting laminate is hot-rolled to form an Al core material and an Al skin. When manufacturing an aluminum clad material that is joined and integrated with the material,
Connected between a large number of point-like thick portions having a thickness of 0.2-3.2 mm and adjacent ones of the point-like thick portions, which are arranged at intervals of 0.2-13 mm in each of the vertical and horizontal directions. And using a joining auxiliary member made of aluminum or aluminum alloy having a network structure formed from a connecting portion having a thickness smaller than the point-like thick portion, on one side or both sides of this joining auxiliary member , In a form in which an Al sheet made of aluminum having a thickness of 5 to 200 μm and an Mg content of 0 to 0.7 mass% is disposed, the joining auxiliary member and the Al sheet are combined with the Al core material and the Al A method for producing an aluminum clad material, wherein the laminate is constituted by interposing it at a joint interface with an aluminum skin material, and hot rolling is performed on the laminate.   The joining auxiliary member is configured by using an Al wire having a wire diameter of 0.1 to 1.6 mm as a vertical line and a horizontal line, respectively, and the dotted thick part is formed at an intersection of the vertical line and the horizontal line. The method for producing an aluminum clad material according to claim 1.   The manufacturing method of the aluminum clad material of Claim 1 or Claim 2 in which the said joining auxiliary member is formed with the aluminum alloy containing 1.5-6 mass% Mg.   The method for producing an aluminum clad material according to any one of claims 1 to 3, wherein the Al sheet is made of pure aluminum or an aluminum material having an aluminum content of 99.0% by mass or more.   5. The bonding auxiliary member according to claim 1, wherein the oxide film on the surface thereof is chemically destroyed and removed by treatment with an acid solution or an alkali solution. 6. Manufacturing method of aluminum clad material. Between the Al core material and the Al skin material, a plate-shaped Al intermediate material made of aluminum or an aluminum alloy is further interposed, and between the Al core material and the Al intermediate material, and the Al intermediate material. The laminate is configured by interposing the joining auxiliary member between at least one of the Al skin materials in a form in which the Al sheet is disposed on at least one side thereof. The method for producing an aluminum clad material according to any one of claims 1 to 5, wherein: