JP2016112591A - Method for manufacturing aluminum clad material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improved method for manufacturing an aluminum clad material, achieving upgrading of an aluminum clad material, and capable of manufacturing also combined clad materials which are difficult to be manufactured by a conventional technique.SOLUTION: An aluminum clad material is manufactured by: constructing a laminate in a form where a plurality of recesses having a depth of 0.1-5.0 mm and an opening size of 0.1-5.0 mm are arranged on a superposing surface of an Al core comprising aluminium or aluminium alloy, and an Al skin material so as to bring a distance between the openings to within 25 mm, and where an Al sheet comprising an aluminium material having a content of Mg of 0.7 mass% or less, and having a thickness of 0.02-5.0 mm is interposed between the superposing surfaces of the Al core and the Al skin material provided in the recess; and executing hot rolling to the laminate.SELECTED DRAWING: Figure 1

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 JIS name 2000 series, 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 is formed on the surface. Since an oxide (MgO) is also 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. .

  By the way, in order to improve the bondability of the interface of the metal material clad conventionally, in patent document 1, a protrusion is formed in the crimping surface of a hard metal plate, and a soft metal plate is piled up on it. After that, it has been clarified that a strong bondability can be obtained by rolling. Further, in Patent Document 2, an unevenness is formed on a steel plate as a base material, and an aluminum spray coating is formed thereon to prevent oxidation of the surface, and then an aluminum alloy skin material is overlaid and clad. It has been shown that rolling can increase the bond strength of the interface and reliably achieve cladding.

  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 a clad product can be obtained by such clad rolling, the obtained clad material has problems such as occurrence of blisters and variation in clad rate distribution. That was confirmed.

JP-A-2-034289 JP-A-3-027884

  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 which realizes an improvement in quality and further enables the production of a clad material made of a combination of materials which are difficult to manufacture with the prior art.

  Therefore, as a result of intensive studies to solve such problems, the present inventors have found that, in the production of an aluminum clad material, there are many grooves and holes on the surface on which the Al core material and the Al skin material are superposed. An Al sheet made of an aluminum material having a recess and having a thickness of 0.02 to 5.0 mm and an Mg content of 0.7% by mass or less is formed of the Al core material and the Al skin material. By being clad-rolled so as to be interposed at the joint interface, it is possible to effectively improve the bondability at the interface between the Al core material and the Al skin material, and in addition to improving the quality of the clad material, It has been found that even a clad material made of a combination of materials that has been difficult to manufacture can be manufactured stably.

  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 stacking and stacking the skin materials and hot rolling the obtained laminate, the Al core materials. And a plurality of recesses having a depth of 0.1 to 5.0 mm and a size of the opening of 0.1 to 5.0 mm between the openings, The distance is within 25 mm, and each is disposed, and the Mg content between the overlapping surfaces of the Al core material and the Al skin material provided with the recesses is 0. In a form in which an Al sheet having a thickness of 0.02 to 5.0 mm made of an aluminum material of mass% or less is interposed, the laminate is constituted, and hot rolling is performed on the laminate. The method for producing an aluminum clad material is characterized by the above.

  According to one preferred aspect of the method for producing an aluminum clad material according to the present invention, the recess is composed of a plurality of grooves extending in parallel to each other in at least one direction, and the groove width of the groove is And is configured to correspond to the size of the opening.

  According to another preferred embodiment of the method for producing an aluminum clad material according to the present invention, the recess is composed of a plurality of holes formed independently of each other, and the equivalent circle diameter of the hole. Is configured to correspond to the size of the opening.

  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.

  In addition, according to another desirable embodiment 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. And at least any one of the respective surfaces on the side where the Al core material and the Al intermediate material are superimposed and the respective surfaces on the side where the Al intermediate material and the Al skin material are superimposed The laminate is configured in such a manner that the plurality of recesses are provided on each of the surfaces to be stacked, and the Al sheet is disposed between the overlapping surfaces provided with the recesses. ing.

  Thus, in the method for producing an aluminum clad material according to the present invention, a number of recesses such as predetermined grooves and holes are provided on the surface on which the Al core material and Al skin material are superimposed, and the Mg content In a form in which an Al sheet of 0.7 mass% or less is interposed at the interface between the Al core material and the Al skin material, the clad rolling is performed, so that the Al core material and the Al skin material are provided. Based on the presence of many recesses such as grooves and holes and the function of the Al sheet, the Al core material and the Al skin material are mechanically gripped, thereby peeling the Al skin material during rolling. Thus, it is possible to advantageously achieve the interfacial bonding between the Al core material and the Al skin material by the function of the Al sheet.

  That is, in the present invention, predetermined recesses provided on the surfaces where the Al core material and the Al skin material are superimposed, for example, the groove depth is 0.1 mm to 5.0 mm, and the groove width is 0.1 mm to 5.0 mm. A groove or a hole opened in a size corresponding to a circle equivalent diameter of 0.1 mm to 5.0 mm and an Al sheet disposed between such an Al core material and an Al skin material are Al in the middle of clad rolling. The Al sheet has a function of advantageously suppressing or preventing peeling of the skin material, and in addition, the Al sheet has a function of promoting interfacial bonding between the Al core material and the Al skin material. According to the configuration of the present invention as described above, since the soft material is used for the Al sheet, the Al sheet can be easily placed in a large number of recesses provided in the Al core material and the Al skin material at the initial stage of clad rolling. Get into. Therefore, since the Al sheet that has entered these recesses mechanically grips the Al core material and the Al skin material, it can effectively withstand the shearing force applied to the interface during clad rolling. It is possible to advantageously prevent the peeling off of the Al skin material during the rolling stage where the joining is not sufficient. And as the clad rolling progresses, along with the elongation of the Al core material, the Al skin material and the Al sheet, the oxide film on each surface breaks down, but at that time, since a soft material is used for the Al sheet The Al skin material and the Al core material exposed by the above-described destruction of the oxide film and the metal surface of the Al sheet are immediately strongly pressed against each other, and can be effectively joined together.

  On the other hand, as in the conventional manufacturing method, the Al skin material or the Al core material is gripped by simply laying the Al sheet on the joining interface without providing a recess such as a groove or a hole in the Al skin material or the Al core material. Thus, although the effect of preventing the peeling of the interface during the clad rolling cannot be sufficiently obtained, as in the present invention, an Al sheet is provided between the Al core material provided with recesses such as grooves and holes and the Al skin material. By interposing, the above-described function enables easy clad rolling even for a material having a high Mg content, which is difficult to manufacture with the prior art. In addition, since the Al sheet bites into the recesses such as a number of grooves and holes provided in the Al core material and the Al skin material, sliding at the interface between the core material and the skin material can be effectively suppressed. Thus, since the core material and the skin material can be stretched integrally, the effect of greatly improving the distribution of the clad rate can be advantageously obtained.

  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.

It is one of the schematic diagrams which show the form of a change of an Al sheet when clad-rolling the laminated body of Al core material, Al sheet, and Al skin | leather material according to the manufacturing method of the aluminum clad material according to this invention. FIG. 1 is a schematic diagram showing another example of the deformation form of the Al sheet when a laminate having different recesses in the Al core material and the Al skin material is clad rolled. It is a schematic diagram which shows an example of the planar form of the overlapping surface of Al core material (Al skin material) used in this invention. It is a schematic diagram which shows another example of the planar form of the overlapping surface of Al core material (Al skin material) used in this invention. It is a schematic diagram which shows the further another example of the planar form of the overlapping surface of Al core material (Al skin material) used in this invention. It is a schematic diagram which shows another example of the planar form of the overlapping surface of Al core material (Al skin material) used in this invention.

  Here, the present invention provides a predetermined recess, for example, a number of grooves or holes, on the surface where the Al core material and the Al skin material to be clad are overlapped, while the Al core material and the Al skin material In the meantime, it has a great feature in performing clad rolling in a form in which an Al sheet made of an aluminum material having an Mg content of 0.7% by mass or less is interposed.

  That is, as schematically shown in FIG. 1 and FIG. 2, concave surfaces such as grooves and holes of a predetermined size are formed on the overlapping surface of the Al core material 2 and the Al skin material 4, in other words, on the joint surface thereof. A plurality of places 8 are provided, and a predetermined Al sheet 6 is interposed at the joining interface between the Al core material 2 and the Al skin material 4 to form a laminated body 10 and clad rolling. In the initial stage of the clad rolling, when a reduction is applied, the Al sheet 6 which is a soft material is easily deformed, and the plurality of recesses 8 provided in both the Al core material 2 and the Al skin material 4 are formed. It gets into the space and fills it. In the schematic diagram shown in FIG. 2, the recess 8 is formed in a large shape, and a portion located between the other recesses 8 and 8 enters into the one recess 8 by rolling, In this way, the Al core material 2 and the Al skin material 4 are fitted to each other in a form that is joined. Then, the Al core material 2 and the Al skin material 4 are mechanically gripped by the Al sheet 6 due to deformation or flow due to the rolling action of the Al sheet 6 during the rolling, and the interface between them is joined. It is possible to withstand the shearing force applied to the interface at the time of rolling even in the middle of rolling in which rolling has not progressed, and therefore it is possible to proceed rolling without peeling the skin material 4. is there. In addition, the presence of such an Al sheet 6 effectively promotes the interface bonding between the Al core material 2 and the Al skin material 4.

  By the way, as the plurality of recesses 8 provided in each of the Al core material 2 and the Al skin material 4 used in the present invention, it is possible to adopt various known forms, but it is advantageous. It is formed in a groove shape or a hole shape. Therefore, as the shape of the hole, a polygonal shape such as a triangular shape or a rectangular shape can be adopted in addition to a circular shape, and the groove shape can be a triangular shape, a rectangular shape, a corrugated shape, a U shape, etc. That which exhibits is adopted. Furthermore, even if it exists in the arrangement | positioning form in the overlapping surface (joint surface) of such Al core material 2 or Al skin | leather material 4 of the recess 8, it is not specifically limited, In the planar view, it is regular. In addition to the arrangement form, any irregular arrangement form may be used. For example, when a hole having a predetermined depth is provided as the recess 8, an arrangement form such as a lattice arrangement or a staggered arrangement in a plan view of the overlapping surface of the Al core material 2 or the Al skin material 4 is employed. When the grooves are provided, they are provided in the form of a plurality of grooves extending in parallel with each other in at least one direction in the same plan view. Such a plurality of grooves are specifically formed in two directions in which a plurality of grooves extending in one direction are provided in parallel with each other at a predetermined interval, and the plurality of grooves are different from each other. Are arranged in parallel with each other at a predetermined distance from each other, and in a form intersecting at right angles or in an inclined manner, the grooves are provided so as to extend in different directions, and irregularly arranged. It is also possible to be provided in the form. Furthermore, it is also possible to adopt a form in which the holes and the grooves are mixed and arranged as the recess 8.

  The plurality of recesses 8 provided in the Al core material 2 and the Al skin material 4 according to the present invention are formed by the Al sheet 6 disposed between the Al core material 2 and the Al skin material 4 entering there. It exhibits the effect of gripping the Al core material 2 and the Al skin material 4, and it is not always necessary for the Al core material 2 and the Al skin material 4 to overlap. However, as shown in FIG. By providing the recesses 8 so as to overlap, the grip force of the Al core material 2 and the Al skin material 4 can be obtained more effectively.

  In particular, in the present invention, the effect of improving the clad rate distribution is affected by the position of the recesses 8 provided in the Al core material 2 and the Al skin material 4, the arrangement form thereof, etc., for example, as shown in FIG. As shown, when a large number of grooves 12 having the same length as the width of the Al core material 2 or the Al skin material 4 are provided as the recesses 8 in a direction perpendicular to the rolling direction, the core material 2 and the skin material 4 The sliding in the rolling direction at the interface can be effectively suppressed, and the distribution of the cladding rate in the rolling direction can be improved satisfactorily. Here, for easy understanding, the groove 12 is represented by a single line, and in other drawings, the groove is represented by a single line. Further, as shown in FIG. 4, when a large number of holes (here round holes) 14 are provided in the overlapping surface of the Al core material 2 and the Al skin material 4, or rolling as shown in FIG. 5. 6 and a plurality of grooves 12a and 12b in the two directions of the direction and the direction orthogonal thereto, the grooves in the same direction are provided at a predetermined interval to form a mesh structure, or as shown in FIG. Thus, in the case where a large number of grooves 16 are provided in parallel with each other in a 45 ° direction, for example, in addition to the rolling direction at the interface between the core material 2 and the skin material 4. The sliding in the width direction is effectively suppressed, so that the distribution of the clad rate in the rolling direction and the direction orthogonal to the rolling direction is improved satisfactorily.

  In addition, the plurality of recesses 8 respectively formed on the overlapping surface of the Al core material 2 and the Al skin material 4 used in the present invention has a depth of 0.1 mm to 5.0 mm, and has a large opening. In a size of 0.1 mm to 5.0 mm. Therefore, when such a recess 8 is a hole, its equivalent circle diameter corresponds to the width of the recess 8 and is provided in a size of 0.1 mm to 5.0 mm. In some cases, the groove width is 0.1 mm to 5.0 mm so that the groove width corresponds to the size of the opening of the recess 8. When the depth of the recess 8 is less than 0.1 mm, the grip force of the Al core material 2 and the Al skin material 4 obtained by the Al sheet 6 filling the recess 8 is insufficient, and is added to the interface during rolling. It becomes impossible to endure the shearing force, and the Al skin material 4 may be peeled off. In addition, it becomes difficult to suppress the sliding between the Al core material 2 and the Al skin material 4, resulting in a problem that the effect of improving the clad rate distribution cannot be obtained. Further, when the depth of the recess 8 exceeds 5.0 mm, the grip force of the Al core material 2 and the Al skin material 4 becomes saturated, and the recess 8 is completely formed by the Al sheet 6. As a result, there is a possibility that unjoined portions are generated, and a problem that blisters are partially generated is caused. Furthermore, when the size of the opening of the recess 8 is less than 0.1 mm, the grip force between the Al core material 2 and the Al skin material 4 is insufficient, and the Al skin material 4 cannot withstand the shearing force applied to the interface during rolling. In addition to the possibility of peeling, the sliding of the Al core material 2 and the Al skin material 4 cannot be suppressed, and the effect of improving the cladding ratio distribution cannot be obtained. On the other hand, when the size of the opening of the recess 8 exceeds 5.0 mm, the grip force between the Al core material 2 and the Al skin material 4 is insufficient, and it becomes difficult to withstand the shearing force applied to the interface during rolling. As a result, the Al skin material 4 may be peeled off.

  Furthermore, the intervals between the plurality of recesses 8 provided on the overlapping surfaces of the Al core material 2 and the Al skin material 4 used in the present invention, for example, the intervals between the grooves 12, 12a, 12b, 16 and the intervals between the holes 14 are as follows. The thickness is determined mainly depending on the thickness of the Al skin material 4 and the later-described Al intermediate material, the material thereof, and the size of the recesses (grooves 12, 12a, 12b, 16, holes 14, etc.). In the present invention, however, the recesses 8 (grooves 12, 12a, 12b, 16 and holes 14) are provided at intervals of 25 mm or less in a plan view of the overlapping surface. When the interval between the recesses 8 exceeds 25 mm, the Al sheet 6 lacks the gripping force between the Al core material 2 and the Al skin material 4 obtained by filling the recesses 8, and during rolling, The skin material 4 cannot withstand the shearing force applied to the interface, and the skin material 4 may be peeled off. The lower limit of the interval between the recesses 8 is appropriately selected depending on the shape and size of the recesses 8. For example, as the recesses 8, grooves ( In the case of providing 12, 12a, 12b, 16), the interval can be set to zero.

  Incidentally, in order to form the recesses 8 such as grooves and holes according to the present invention as described above on the overlapping surfaces of the Al core material 2 and the Al skin material 4, various known methods can be appropriately employed. Therefore, the intended recess 8 is provided in accordance with a conventional method by, for example, cutting called “milling”, “end milling”, “drilling”, “shaper” or the like, or pressing.

  Further, according to the present invention, the Al sheet 6 interposed between the overlapping surfaces of the Al core material 2 and the Al skin material 4 provided with the recesses 8 as described above has an Mg content of 0.7% by mass or less. It must be made of aluminum material. On the other hand, when the Mg content in the Al sheet 6 exceeds 0.7 mass%, the strength of the Al sheet 6 increases, and the recess 8 provided in the Al core material 2 or the Al skin material 4 is provided. In addition to being unable to fill completely, there is a possibility that an unjoined portion may be generated, and in addition, the oxide film of the Al sheet 6 becomes strong and hinders joining. In addition, although it does not specifically limit as another component of the aluminum material which provides this Al sheet 6, the direction with a low intensity | strength is immediately with respect to the Al skin material 4 and the Al core material 2, as mentioned above. It is preferable that it is made of pure aluminum or an aluminum material having an aluminum content of 99.0% by mass or more because it is strongly pressed and joined.

  Furthermore, the thickness of the Al sheet 6 used in the present invention is determined as appropriate according to the thickness of the laminated layer of the Al skin material or Al intermediate material, the shape of the recess, etc., among the clad components. However, regardless of these, in the present invention, a thickness of 0.02 to 5.0 mm is adopted. When the thickness is less than 0.02 mm, the Al sheet 6 is broken when the Al sheet 6 bites into the recess 8 provided in the Al core material 2 or the Al skin material 4 at the initial stage of clad rolling, and the Al core material is broken. This is because the effect of gripping 2 or the Al skin 4 cannot be obtained, and the skin may be peeled off during rolling. When the thickness exceeds 5.0 mm, the Al sheet 6 preferentially expands due to the shearing force generated during rolling, and as a result, the Al core material 2 and the Al skin material 4 are integrated. Therefore, the effect of improving the clad rate distribution cannot be obtained. Further, in the case where the unevenness due to the recess 8 provided in the Al core material 2 and the Al skin material 4 does not overlap (see FIG. 1), the thickness of the Al sheet 6 is provided in the Al core material 2 and the Al skin material 4. It is more preferable that the depth is greater than or equal to the depth of the recess 8. On the other hand, in a form in which the recesses and recesses provided in the Al core material 2 and the Al skin material 4 overlap (see FIG. 2), It is also possible to reduce the thickness of the sheet 6.

  In order to further improve the functions of the recess 8 and the Al sheet 6 provided in the Al core material 2 and the Al skin material 4 as described above, in the Al skin material 4, the Al core material 2, the Al intermediate material and the Al sheet 6 It is effective to chemically destroy and remove the oxide film with an acid solution or an alkali solution prior to hot clad rolling. The destruction / removal of the oxide film by this acid solution or alkali solution is generally called an etching process, but etching of the Al skin material 4, the Al core material 2, the Al intermediate material, the Al sheet 6 and the like in the present invention. For the treatment, an acid or alkali aqueous solution such as hydrofluoric acid, sulfuric acid, phosphoric acid, hydrochloric acid, sodium hydroxide or calcium hydroxide is selected according to the material, and smut removal caused by etching is removed. Therefore, nitric acid or the like may be used. The surface of the Al skin material 4, the Al core material 2, the Al intermediate material, the Al sheet 6 and the like from which the oxide film has been destroyed and removed by this etching process is immediately subjected to a natural oxide film after such an etching process. Although it is formed, it is thin and brittle compared to the oxide film formed at the time of manufacturing the material, so it is easily broken by the rolling force during hot clad rolling, and therefore it has not been etched. Compared with the Al core material 2, the Al skin material 4, and the Al sheet 6, it becomes possible to improve. The necessity of such an etching process 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 99.0% by mass or more. In general, the Al core material 2 to be chamfered, the Al skin material 4 to which chamfering is performed, and the Al intermediate material can be omitted.

  By the way, according to the present invention, the Al core material 2 and the Al skin material 4 that are hot-clad rolled with the predetermined recesses 8 disposed and the Al sheet 6 interposed between the overlapping surfaces are publicly known. A material in the form of a plate made of aluminum or an aluminum alloy, for example, various aluminum alloys of 1000 series aluminum and 2000 series to 8000 series of JIS name are used as the material. In this case, a clad material is produced using a core material or a skin material made of a 2000 series, 5000 series, 6000 series, or 7000 series aluminum alloy, which has conventionally been difficult to produce clad materials. It becomes possible. In such an aluminum material, different materials are selected for the Al skin material 4 and the Al core material 2. 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.

  In addition, when manufacturing the aluminum clad material according to the present invention, as a form before the recess formation processing is performed on the Al skin material 4 and the Al core material 2 constituting the laminate subjected to hot clad rolling, A plate-like material having a predetermined thickness made of aluminum or an aluminum alloy is used. For example, as the Al core material 2, an aluminum slab (thick plate-like block) made of aluminum or an aluminum alloy is subjected to processing such as chamfering. A sheet having a predetermined thickness is used, and in the case of the Al skin material 4, a plate material obtained by hot rolling the aluminum slab is used.

  Furthermore, as another form of the Al skin material 4 used in the present invention, it is formed of a thick plate cut out from an aluminum slab. Furthermore, the joint interface may be smoothed by machining.

  Furthermore, in the present invention, a recess 8 is provided in the Al core material 2 and the Al skin material 4, and a laminate 10 obtained by interposing an Al sheet 6 between the overlapping surfaces thereof is used. In addition to hot clad rolling, at least one plate-like Al intermediate material made of aluminum or an aluminum alloy and having a different material from the skin material 4 or the core material 2 is formed between the Al skin material 4 and the Al core material 2. The present invention can also be applied to a laminate formed by interposing one. 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 provided for the purpose of improving corrosion resistance between the Al skin material 4 and the Al core material 2. Although it is interposed, the present invention is advantageously applied to the aluminum clad material having such a configuration. In such an aluminum clad material composed of the Al skin material 4, the Al intermediate material, and the Al core material 2, the surface on which the skin material 4 and the intermediate material 2 are superimposed and the surface on which the intermediate material and the core material 2 are superimposed. Further, by providing the recess 8 such as a groove or a hole according to the present invention, interposing an Al sheet at the interface, and performing hot clad rolling, the effect according to the present invention can be advantageously exhibited.

  And when manufacturing the target aluminum clad material according to the present invention, the laminate of the Al core material 2, the Al sheet 6, and the Al skin material 4 as described above, or the Al core material 2, the Al sheet 6, and the Al intermediate material. The clad rolling is applied to the laminate of the Al sheet 6 and the Al skin material 4 in the same manner as in the prior art. After being fixed to, or without being fixed, hot clad rolling is performed.

  Therefore, for example, welding is generally advantageous as a means for partially fixing the Al skin material, the Al sheet, the Al intermediate material, and the Al core material constituting such a laminate at the outer peripheral portion thereof. However, 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 metal fittings, or the like can be appropriately employed. In addition, such partial fixing at the outer peripheral portion is performed by a peripheral portion of the bonding interface in a part of the outer peripheral portion with an Al sheet or Al intermediate material interposed at the bonding interface between the Al skin material and the Al core material. The bonding interface is configured to be communicated with the outside atmosphere except for the fixing portion. Further, such partial fixing in 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. In addition, the clad rolling is performed in a form in which each of the bonding interfaces is communicated with the outside atmosphere.

  In the present invention, instead of partial fixing in the laminate as described above, for example, Al skin material, Al sheet, Al core material (or Al skin material, Al sheet, It is also possible to subject the laminate to clad rolling in a form in which the joint interface is communicated to the atmosphere without fixing each other (Al intermediate material, Al intermediate material, Al sheet, and Al core material). It is. However, in the state where each laminated 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 plurality of recesses such as grooves or holes are provided on the overlapping surface, which is the bonding interface between the Al skin material and the Al core material that are overlapped and clad, and the Al skin material and the Al core material In a form in which a predetermined Al sheet is arranged between the overlapping surfaces, the clad rolling suppresses peeling of the skin material caused by the shearing force applied to the joining interface during rolling, and the core material and the skin material during rolling As a result, it is possible to effectively produce a clad material that has been difficult to manufacture, and thus achieves both strength, formability, corrosion resistance, and the like. It was possible to design materials with difficult characteristics. In addition, since a quality improvement effect such as an improvement in the accuracy of the clad rate distribution can be obtained, an improvement in the yield of the material to be clad can be advantageously realized, 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.

Example 1
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. Therefore, the Al core material is obtained by chamfering an Al ingot (slab) formed by the continuous casting method in the same manner as in the conventional method, and has a thickness of 120 to 190 mm × width: 200 mm × length: 300 mm. In addition, the Al skin material and the Al intermediate material are hot rolled to a thickness of 10 to 40 mm after casting of an Al ingot made of each aluminum material, and width: 200 mm × length: Manufactured by cutting to a size of 300 mm.

  Next, milling is performed using a machining center on the surfaces of the prepared Al core material, Al intermediate material, and Al skin material (the Al intermediate material is both surfaces thereof), and 90 ° with respect to the rolling direction. Or a plurality of grooves having a triangular cross section having a groove depth of 0.06 to 5.5 mm and a groove width of 0.06 mm to 6.0 mm as shown in Table 2 or 3 extending in the 45 ° direction. Were provided at equal intervals of 0 mm to 28.0 mm.

  For the Al sheet, various ingots of aluminum materials (H to K) shown in Table 1 below are prepared by continuous casting, and the surface of the obtained ingot is chamfered, and then the thickness is obtained. : 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 cold rolling was performed to a thickness as shown in Table 2 or Table 3 to 0.3 mm to 2.5 mm. Moreover, about Al sheet | seat of thickness less than 0.3 mm, what was cold-rolled to the said thickness of 0.3 mm, and also the thickness of Table 2 or Table 3: 0.01 mm-0.1 mm The foil was rolled to a thickness and then annealed, and then the foil of each thickness was cut into a width: 200 mm and a length: 300 mm to produce a target Al sheet.

  And about the Al skin material obtained above, surface treatment was implemented as follows as needed. That is, the joining surface of the Al skin material was subjected to an alkali etching treatment with a 5% aqueous sodium hydroxide solution while being hot-rolled (however, a degreasing treatment with acetone and hole and groove processing were performed).

  Next, using various types of Al skin material, Al core material, Al sheet and Al intermediate material as described above, the layers shown in Table 2 or Table 3 were laminated, and the width at each corner of the resulting laminate was obtained. The portions each having a length of 30 mm in the 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 clad rolling starts from a ratio of 0.5% with respect to the thickness of the laminate, and the rolling reduction is 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.

  The various aluminum clad materials obtained in this way are each inspected for appearance, evaluated for the occurrence of peeling and swelling, measured for the clad rate of the skin material, and further evaluated overall. The results are shown in Tables 4 to 5 below. Further, the cross section at the center in the width direction of the clad material was observed at 10 points along the rolling direction, and the clad rate was calculated from the measurement results of the thickness of the skin material and the intermediate material and the thickness of the clad material. The judgment of the clad rate distribution is 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, and “◎” is over 5%. Those with 10% or less were rated as “◯”, and those with more than 10% as “x”. Furthermore, as a comprehensive evaluation, “○” indicates that there is no problem in all aspects of the presence or absence of peeling of the skin material during rolling and the distribution of the blistering and clad ratio, and “×” indicates that there is even one problem. .

  As is apparent from the results of Tables 2 to 3 and Tables 4 to 5, 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 satisfactorily performed up to a thickness of 1 mm, and no peeling or blistering is observed, and the clad rate distribution is excellent. It was recognized that

  On the other hand, an aluminum clad material No. in which a groove as a recess according to the present invention is not provided in the Al skin material or the Al core material, and the Al sheet is not laid 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, the aluminum clad material No. in which the Al sheet according to the present invention is not laid between the Al skin material and the Al core material. In the case of 16, the joining of the Al skin material and the Al core material was not sufficient, and the occurrence of blistering was confirmed. In addition, it was confirmed that the grip force between the Al skin material and the Al core material was not sufficient, sliding at the interface between the Al skin material and the Al core material could not be suppressed, and the clad rate varied greatly. Also, an aluminum clad material No. having no groove in the Al skin material and the Al core material and only having an Al sheet laid at the interface. In the case of 17, the effect of gripping the Al skin material and the Al core material is weak, and furthermore, it is a combination of materials having poor bondability, so that it can withstand the shear force generated at the interface between the Al skin material and the Al core material. Was not able to be performed, and peeling occurred greatly during the hot rolling, 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 strength of the Al sheet is high, the Al sheet does not sufficiently enter the groove provided in the Al skin material and the Al core material, the grip force to the Al skin material and the Al core material is not sufficient, and Al She could not withstand the shearing force generated at the interface between the skin material and the Al core material, peeled off during hot rolling, and could not be rolled to the end. The aluminum clad material No. In the case of 19, since the maximum depth of the groove provided in the Al skin material or Al core material is 5.5 mm, the Al sheet cannot completely fill the groove or hole, and part of the blistering occurs. Occurred. On the other hand, an aluminum clad material No. 2 having a maximum depth of 0.06 mm in the groove provided in the Al skin material or the Al core material. In the case of 20, the grip force due to the Al sheet entering the groove provided in the Al skin material and the Al core material is not sufficient, and therefore, it can withstand the shearing force generated at the interface between the Al skin material and the Al core material. It was not possible to peel off during the hot rolling, and it was not possible to roll to the end.

  And the width | variety of the groove | channel provided in Al skin material or Al core material is 0.06 mm, and aluminum clad material No. In the case of 21, the grip force by the Al sheet is not sufficient, so that it cannot withstand the shear force generated at the interface between the Al skin material and the Al core material, and peeling occurs during the hot rolling, It was not possible to roll to the end. On the other hand, an aluminum clad material No. 1 having a width in the rolling direction of a groove provided in the Al skin material or the Al core material is 6.0 mm. In the case of 22, the grip force by the Al sheet is not sufficient, and therefore it cannot withstand the shearing force generated at the interface between the Al skin material and the Al core material, and peeling occurs during the hot rolling, It was not possible to roll to the end. Moreover, the aluminum clad material No. 2 in which the interval in the rolling direction of the grooves provided in the Al skin material or the AL core material is 28.0 mm. In the case of No. 23, the grip force by the Al sheet is not sufficient, so that it cannot withstand the shear force generated at the interface between the Al skin material and the Al core material, and peeling occurs during the hot rolling, It was not possible to roll to the end.

  Furthermore, aluminum clad material No. 1 using an Al sheet having a thickness of 0.01 mm. In the case of 24, the grip force to the Al skin material and the Al core material is not sufficient, and it cannot withstand the shearing force generated at the interface between the Al skin material and the Al core material, and is largely peeled off during hot rolling. Was generated and could not be rolled to the end. In contrast, aluminum clad material No. 1 using an Al sheet having a thickness of 5.5 mm. In the case of 25, the Al sheet was preferentially deformed during rolling, and the Al skin material and the Al core material could not be stretched together, and as a result, it was recognized that the clad rate varied greatly.

-Example 2-
First, each of the aluminum ingots made of various aluminum materials (A to G) shown in Table 1 was manufactured by the continuous casting method in the same manner as the conventional method, and then the obtained Al ingot was used. In the same manner as in Example 1, an Al core material, an Al intermediate material, and an Al skin material were prepared.

  Then, hole depths as described in Table 6 or Table 7 below: 0.06 mm to 5.5 mm, hole diameters: 0.06 mm to A flat bottom round hole having 6.0 mm was provided in a lattice shape at regular intervals of 1.0 mm to 28.0 mm by a normal drilling process. And among those obtained, about the Al skin material, the surface treatment similar to Example 1 was implemented as needed.

  Further, for the Al sheet, various ingots of aluminum materials (H to K) shown in Table 1 above were produced by a continuous casting method, and the target Al sheet was prepared in the same procedure as in Example 1. Produced.

  Then, using various kinds of Al skin material, Al core material, Al sheet, and Al intermediate material as described above, the layers are laminated in the combinations shown in Table 6 or Table 7, and each is welded in the same manner as in Example 1. The laminated materials were fixed to each other and rolled.

  Thereafter, the various aluminum clad materials thus obtained were each inspected in the same manner as in Example 1 to evaluate the state of peeling and swelling, and the skin materials and intermediate materials. The clad rate was measured, and further comprehensive evaluation was performed. The results are shown in Tables 8 to 9 below.

  As is apparent from the results in Tables 6 to 7 and Tables 8 to 9, the aluminum clad material No. obtained according to the present invention was obtained. In Nos. 26 to 33, regardless of the clad rate, the clad rolling can be satisfactorily performed until the thickness reaches 1 mm, and any occurrence of problems such as peeling and swelling is not recognized. It was also recognized that the cladding ratio distribution was excellent.

  On the other hand, the aluminum clad material No. in which the Al sheet according to the present invention is not laid between the Al skin material and the Al core material. In the case of 34, 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 confirmed that the grip force between the Al skin material and the Al core material was not sufficient, sliding at the interface between the Al skin material and the Al core material could not be suppressed, and the clad rate varied greatly.

  Also, aluminum clad material No. In the case of 35, since the depth of the hole provided in the Al skin material or the Al core material was 5.5 mm, the Al sheet could not completely fill the hole, and the bulge was partially generated. On the other hand, an aluminum clad material No. 1 having a hole depth of 0.06 mm in the Al skin material or the Al core material was used. In the case of 36, the grip force due to the Al sheet entering the hole provided in the Al skin material and the Al core material is not sufficient, and therefore, it can withstand the shearing force generated at the interface between the Al skin material and the Al core material. It was not possible to peel off during the hot rolling, and it was not possible to roll to the end. In addition, the aluminum clad material No. 1 in which the diameter of the hole provided in the Al skin material or the Al core material is 0.06 mm. In the case of 37, the grip force due to the Al sheet entering the hole is not sufficient, so that it cannot withstand the shear force generated at the interface between the Al skin material and the Al core material, and during the hot rolling. It peeled off and could not be rolled to the end. On the other hand, an aluminum clad material No. 1 having a diameter of the hole provided in the Al skin material or the Al core material of 6.0 mm is provided. In the case of No. 38, the grip force by the Al sheet is not sufficient, so that it cannot withstand the shear force generated at the interface between the Al skin material and the Al core material, and peeling occurs during the hot rolling, It was not possible to roll to the end. In addition, an aluminum clad material No. 1 having an interval of holes provided in the Al skin material or the Al core material of 28.0 mm is used. In the case of 39, the grip force by the Al sheet is not sufficient, so that it cannot withstand the shear force generated at the interface between the Al skin material and the Al core material, and peeling occurs during the hot rolling, It was not possible to roll to the end.

2 Al core material 4 Al skin material 6 Al sheet 8 Recess 10 Laminate 12, 12a, 12b Groove 14 Hole 16 Groove

Claims (5)

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,
A plurality of recesses having a depth of 0.1 to 5.0 mm and a size of the opening of 0.1 to 5.0 mm are formed on the overlapping surface of the Al core material and the Al skin material. The distance between the parts is 25 mm or less, and the Mg content is 0.7% by mass or less between the overlapping surfaces of the Al core material and the Al skin material provided with the recesses. In the form in which an Al sheet having a thickness of 0.02 to 5.0 mm is interposed, the laminate is configured, and hot rolling is performed on the laminate. A method for producing an aluminum clad material.   2. The recess according to claim 1, wherein the recess is configured by a plurality of grooves extending in parallel with each other in at least one direction, and the groove width of the groove corresponds to the size of the opening. Manufacturing method of aluminum clad material.   The said recessed part is comprised by the some hole formed mutually independently, The circle equivalent diameter of this hole is comprised so that it may correspond to the magnitude | size of the said opening part. Manufacturing method of aluminum clad material.   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. A plate-like Al intermediate material made of aluminum or an aluminum alloy is further interposed between the Al core material and the Al skin material, and each of the side on which the Al core material and the Al intermediate material are overlapped with each other. A plurality of recesses are provided on each of the surfaces to be overlapped and at least one of the surfaces to which the Al intermediate material and the Al skin material are to be stacked; and The aluminum clad according to any one of claims 1 to 4, wherein the laminate is configured in a form in which the Al sheet is disposed between the provided overlapping surfaces. A method of manufacturing the material.

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