JP2006088172A - Method of producing blank material for press forming and blank material for press forming obtained thereby - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for inexpensively producing a blank for press forming which is formed by joining a plurality of metallic plates integrally with each other and has excellent joining quality, productivity and press-formability. <P>SOLUTION: A method of producing a blank material for press forming is characterized in that only on one face side of one metallic plate 12 out of a plurality of metallic plates 12, 14, parts 48, 50 to be joined with each other of the respective metallic plates 12, 14 are overlapped in contact with each other or via a predetermined space therebetween while the other metallic plate 14 is located, and after a coil 18 for pressure welding is located in a corresponding manner on only the other face side of the metallic plate 12, the instantaneous large current is allowed to flow in the coil 18 for pressure welding, so that the plurality of metallic plates 12, 14 are pressure-welded instantaneously to each other at the parts 48, 50 to be joined and integrated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing a press-molding blank material and a press-molding blank material obtained thereby, and in particular, advantageously produces a press-molding blank material in which a plurality of metal plates are joined together. And a characteristic press-molding blank obtained by such a manufacturing method.

  Conventionally, when a desired press product is obtained, a technology for producing a blank material for press molding by cutting a single metal plate into a predetermined shape, and then performing press molding on the blank material. However, in recent years, a plurality of metal plates are joined and integrated to produce a single blank for press molding, referred to in part as a tailored blank, and Press molding technology that obtains a desired press product by performing a predetermined press molding on this blank for press molding is often used, for example, to obtain a press product for an interior panel of an automobile. Has been.

  In such a press molding technique, a press molding blank material is manufactured by joining and integrating a plurality of metal plates to each other. Not only does this occur, but a small metal plate that cannot be used with general press molding technology can be used as a blank material, which can advantageously reduce material costs. The advantage that it becomes becomes. In addition, some of the plurality of metal plates that give the blank material are composed of high-strength metal plates, or some of them are used as reinforcing plates to be integrally bonded to another metal plate. By doing so, it is possible to exhibit an excellent feature that a pressed product in which a necessary strength is imparted to a necessary portion can be easily obtained.

  However, in the press molding technology using such a characteristic blank for press molding, until now, laser welding or arc welding in which a plurality of metal plates are brought into contact with each other and melt-welded, or a part of each of the plurality of metal plates is performed. Since the blank material was manufactured by joining a plurality of metal plates by various welding methods such as seam welding that continuously resistance welds the polymerization sites, such a blank material and In the obtained press product, the following various problems have been caused.

  That is, when producing a blank for press molding by butting a plurality of metal plates and melting and welding them, it is difficult to manage the gap (gap) at the butted portion between the metal plates. When different metal plates are melt welded, the melted portion is insufficiently melted due to the difference in thickness, resulting in variations in the bonding strength, resulting in poor bonding quality of the blank material. The problem of becoming stable has arisen.

  Further, even when resistance welding is performed by overlapping a part of each of the plurality of metal plates, for example, when performing mash seam welding using an electrode disk, the electrode portion of the electrode disk is welded to the metal plate. The bonding strength may decrease due to adhesion to the part or crushing. Furthermore, since the bonding strength is affected by the surface properties of the overlapped parts to be joined, the blank with stable joining quality. The problem of making it difficult to manufacture the material was inherent.

  Further, in the conventional blank material manufacturing method in the press forming technology, in any case, when joining a plurality of metal plates, the joined portion is heated and melted, and the thermal effect is exerted on the vicinity of the produced blank material joining portion. It is inevitable that a part (softening region) is generated, and therefore, when the produced blank material is directly press-molded without being subjected to a predetermined post-treatment, it is broken at the heat-affected zone. But often it was.

  Furthermore, in the conventional method for manufacturing a blank for press forming, the maximum joining speed of a plurality of metal plates is approximately 5 m / min, which is a relatively slow speed, so the length of the joined parts is long. Indeed, the work time required for welding becomes redundantly longer and not only productivity is lowered, but heat input is accumulated, and the blank material is distorted and structurally changed, thereby improving the appearance and strength. As a result, the press accuracy during press molding is reduced.

  Under such circumstances, the applicants of the present application use the electromagnetic pressure welding method, which is a kind of solid-phase bonding method, to join a plurality of metal plates to each other and integrate them to obtain a target blank material for press molding. The technique made to manufacture was proposed in the following Patent Document 1.

  That is, in the manufacturing method of the blank material for press forming proposed by the applicants of the present application, the portions to be joined of the plurality of metal plates can be pressed against each other, in other words, in contact with each other. In a state where the metal plates are overlapped with each other with a predetermined gap between them, the pressure welding coils are arranged so as to sandwich the plurality of metal plates from both sides in the overlapping direction, and then an instantaneous large current is passed through the pressure welding coils. The plurality of metal plates can be joined to each other without causing the plurality of metal plates to be heated and melted by instantaneously generating an electromagnetic force acting in a direction in which the metal plates are pressed against each other. Are instantaneously brought into pressure contact with each other and integrated.

  Therefore, according to the proposed method, a problem in the management of the gap in the butt portion of each metal plate caused by the conventional method in which a plurality of metal plates are melt-welded in a state where they are butted or overlapped with each other. In addition, there is a problem of reduction in bonding strength due to differences in plate thickness between multiple metal plates and adhesion of the electrode disk to the welded part, as well as press formability due to generation of heat affected zone and inefficient bonding work. Since the problem of deterioration is greatly eliminated, the target press-molding blank can be advantageously manufactured with stable joint quality, excellent productivity, and high press-formability. is there.

  However, the inventors have examined the manufacturing method of the blank material for press molding that exhibits such excellent characteristics from various aspects, and as a result, the manufacturing cost of the blank material for press molding is still improved. It has been found that there is room for this.

JP 2004-42085 A

  Here, the present invention has been made in the background as described above, and the first problem to be solved is that a plurality of metal plates are joined together and integrated. An object of the present invention is to provide a method capable of producing a press-molding blank material having a structure and having stable joining quality and high press-formability with excellent productivity and at a lower cost. Moreover, this invention makes it the 2nd solution subject to provide the blank material for press molding obtained advantageously by such a manufacturing method.

  And, as a result of intensive studies for the solution of such problems, the present inventors, as a result of the overlapping direction, with respect to a plurality of metal plates that are in contact with each other or overlapped through a predetermined gap It has been found that a plurality of metal plates can be joined with sufficient joining strength even when a pressure welding coil is disposed only on one side of the metal plate and electromagnetic welding operation is performed.

  That is, the present invention has been completed based on such knowledge, and the first aspect thereof is that a plurality of metal plates are joined together and integrated to form a press. A blank material used in the above-mentioned method, wherein the plurality of metal plates are arranged in a state where the other metal plate is positioned only on one surface side of one of the plurality of metal plates. The metal plates are stacked in contact with each other at a portion to be joined or sequentially through a predetermined gap, while a pressure welding coil is placed only on the other surface side of the one metal plate. , After positioning the corresponding position of the one metal plate with a gap in the thickness direction, an instantaneous large current is passed through the coil for pressure welding, Metal plate on which the one metal plate is superimposed By instantly generating an electromagnetic force that acts in the direction of pressing against the bonded parts, the plurality of metal plates are instantaneously pressed against each other at the bonded parts to be integrated. It is in the manufacturing method of the blank material for press molding characterized by this.

  In short, in this embodiment, similar to the method using the electromagnetic pressure welding method proposed by the applicant of the present application and the like, a plurality of metal plates are instantaneously bonded to each other without being heated and melted. Therefore, several problems caused in the conventional method of joining the parts to be joined of a plurality of metal plates by fusion welding are as follows. It can be resolved at once.

  Moreover, in this embodiment, the pressure welding coil is disposed only on one side in the overlapping direction of the plurality of metal plates that are in contact with each other or overlapped with each other through a predetermined gap, and this one side When a large current is passed through the pressure welding coil placed in the position, a predetermined electromagnetic force is instantaneously generated in one metal plate positioned corresponding to the pressure welding coil, and a plurality of metal plates are mutually connected. Electromagnetic pressure contact is applied.

  Therefore, in this embodiment, for example, an instantaneous large current is applied to each of the pressure welding coils positioned on both sides of the overlapping direction of the plurality of metal plates that are in contact with each other or overlapped with a predetermined gap. As compared with the proposed method in which a plurality of metal plates are electromagnetically welded to each other, it is possible to advantageously reduce the number of pressure welding coils and thereby to the pressure welding coils. It is possible to reduce the capacity of a power supply device or a capacitor that supplies an instantaneous large current. And as a result, the very outstanding characteristic that the installation cost and work cost which are required for the joining operation | work of a some metal plate can be restrained low is exhibited.

  Further, in the second aspect of the method for producing a press-molding blank material according to the present invention, the plurality of metal plates are sequentially joined to each other at sites to be joined, with a predetermined gap therebetween. When overlapping, the size of the gap is not more than 5 times the total thickness of the two metal plates that are overlapped via the gap, and within the range of 0.1 mm or more. The value of

  Furthermore, in the third aspect of the method for manufacturing a press-molding blank material according to the present invention, at least one of the plurality of metal plates is composed of a plate material made of aluminum or an aluminum alloy, and the plurality of metals. Among the plates, the one metal plate on which the pressure welding coil is positioned correspondingly is constituted by one of the plate materials made of aluminum or aluminum alloy.

  Furthermore, in the fourth aspect of the method for producing a press-molding blank material according to the present invention, the plurality of metal plates have different plate thicknesses, and of the plurality of metal plates, the press contact The one metal plate on which the working coil is positioned correspondingly is formed of the thinnest metal plate among the metal plates having different plate thicknesses.

  In the fifth aspect of the method for manufacturing a press-molding blank material according to the present invention, the plurality of metal plates have different electrical conductivities, and the pressure welding coil among the plurality of metal plates. The electric conductivity of the one metal plate to be positioned correspondingly is made higher by 10% IACS or more than the electric conductivity of the metal plate superimposed on the one metal plate.

  Furthermore, in the sixth aspect of the method for producing a blank material for press molding according to the present invention, a plurality of long thin plates wound so as to form a predetermined coil are used as the plurality of metal plates. While gradually unwinding each of a plurality of coils made of a plurality of metal plates, only on one surface side of the unwinding portion in one metal plate of the plurality of metal plates respectively unwound from the plurality of coils, While the unwinding portions of the other metal plates are positioned, the unwinding portions of the plurality of metal plates are sequentially overlapped with each other in contact with each other or through a predetermined gap. After only the other surface side of the unwinding portion of one metal plate, the pressure welding coil is positioned corresponding to the unbonded portion of the unwinding portion of the one metal plate with a space in the plate thickness direction, To the pressure welding coil By passing a large current and generating the electromagnetic force instantaneously in the unwinding portion of the one metal plate, and repeatedly performing the operation of pressing the unwinding portions of the plurality of metal plates to each other, The plurality of metal plates are continuously pressed and integrated for each unwinding portion, and the joined body of the plurality of metal plates pressed and integrated is cut at a predetermined interval. Will be.

  Furthermore, in a seventh aspect of the blank material for press molding according to the present invention, plate materials having different sizes are used as the plurality of metal plates, and one surface of one metal plate among the plurality of metal plates. With the other metal plates positioned only on the side, the plurality of metal plates are placed on the entire surface of one surface of the metal plate having a smaller size and one metal plate having a larger size. The parts are in contact with each other or are sequentially overlapped with each other through a predetermined gap. On the other side of the one metal plate, a pressure welding coil is joined to the one metal plate. After a corresponding position with a gap in the plate thickness direction with respect to the part to be processed, an instantaneous large current is passed through the coil for pressure welding, and the electromagnetic force is instantaneously generated at the part to be joined of the one metal plate By doing so, the plurality of metal plates are pressed against each other. .

  In order to solve the second technical problem, the eighth aspect of the present invention is a press-molding blank material obtained by the manufacturing method described above.

  In the first aspect of the method for manufacturing a press-molding blank according to the present invention as described above, a plurality of metal plates are joined and integrated by exhibiting the excellent characteristics as described above. The blank material for press molding having the structure thus formed and having stable joining quality and high press formability can be manufactured at a lower cost with excellent productivity.

  In addition, according to the second aspect of the method for manufacturing a press-molding blank material according to the present invention, a portion to be joined of one metal plate that is positioned corresponding to the pressure welding coil by passing an instantaneous large current through the pressure welding coil. When the electromagnetic force is momentarily generated in the metal plate, the metal plates stacked through the gap are collided at a high speed and can be more reliably and stably pressed by the collision effect. Therefore, the intended press-molding blank can be stably produced with even better joint quality.

  Furthermore, according to the third, fourth, and fifth aspects of the method for manufacturing a press-molding blank material according to the present invention, among the plurality of metal plates, the conductivity of one metal plate that is positioned corresponding to the pressure welding coil. The rate can be made sufficiently high, so that when a large current is passed through the pressure welding coil, a larger electromagnetic force is generated in one such metal plate, so that the plurality of metal plates are Furthermore, it can be reliably and stably pressed.

  Further, in the sixth aspect of the method for producing a press-molding blank material according to the present invention, the press-molding blank material having stable joint quality and excellent productivity, and further high press-formability is a simple operation repeated. Therefore, it is possible to manufacture continuously, in large quantities, and easily and quickly, and in addition, the pressure welding coils are sequentially arranged only on one side of a plurality of metal plates that are superimposed. Thus, a reduction in equipment cost and running cost in the joining operation can be advantageously achieved. Therefore, according to the method of the present invention, it is possible to further effectively reduce the production cost of the intended press-molding blank.

  Furthermore, in the seventh aspect of the method for producing a press-molding blank material according to the present invention, the press-molding material having the excellent characteristics as described above and partially reinforced with a metal plate having a small size. The blank material can be manufactured very easily.

  And in the eighth aspect related to the blank material for press molding according to the present invention, stable bonding quality and excellent productivity, and high press moldability can surely be provided, and the The excellent economics in the production process can be exhibited very advantageously.

  Hereinafter, in order to clarify the present invention more specifically, the method for producing a press-molding blank material according to the present invention and the configuration of the press-molding blank material obtained thereby will be described in detail with reference to the drawings. I decided to.

  First, in FIG. 1, as an example of a press-molding blank material manufactured according to the manufacturing method according to the present invention, a tailored blank material, which is a press-molding blank material that gives an automobile interior panel, is schematically shown in its longitudinal cross-sectional form. Has been shown. As apparent from FIG. 1, the tailored blank material 10 has the first and second two metal plates 12 and 14 overlapped with each other at their end portions. By forming the joint portion 15 between them, they are integrated and configured. Although not clearly shown in FIG. 1, in the tailored blank material 10, the joint 15 is provided between the overlapping surfaces of the first metal plate 12 and the second metal plate 14. , 14 is formed over substantially the entire width.

  Also, here, of the two metal plates 12, 14 constituting the tailored blank material 10, the first metal plate 12 is thicker by a predetermined dimension than the second metal plate 14. The thick first metal plate 12 is made of an aluminum flat plate, while the thin second metal plate 14 is made of an iron flat plate. As a result, the strength of the tailored blank 10 is sufficiently greater in the portion made of the thick aluminum first metal plate 12 than in the portion made of the thin iron second metal plate 14. .

  In addition, the kind of metal material which gives the two metal plates 12 and 14 which are the formation material of this tailored blank material 10 is not specifically limited, According to the material, characteristic, etc. which are requested | required of the target press product Thus, the same type or different types are appropriately selected, and even if the plate thicknesses are the same as each other, there is no problem.

  By the way, the tailored blank material 10 of the present embodiment uses, for example, an electromagnetic pressure welding device 16 as shown in FIGS. 2 to 4, and the first and second metal plates 12, 14 as described above. Are manufactured by integrating them with each other by electromagnetic pressure welding.

  That is, the electromagnetic pressure welding apparatus 16 used here includes a capacitor: C, a discharge switch: G, and a pressure welding coil 18 for generating a high-density magnetic flux, and a capacitor on the discharge circuit: A charging circuit including a power supply device 20 for supplying electric charge to C, a base 22 on which a pressure welding coil 18 of the discharging circuit is fixed, and a position fixed so as to straddle the base 22 The gantry 24 is included.

  Further, the gantry 24 constituting such an electromagnetic pressure welding device 16 is erected with a predetermined dimension larger than the width of each of the first and second metal plates 12 and 14 to be electromagnetic pressure welded. Each of the two leg portions 26, 26 and a flat plate-like beam portion 28 extending horizontally from one side of the upper portion of the two leg portions 26, 26 to the other side, and as a whole, a gate type or a lower side It has a U-shaped frame shape that opens toward the top. Further, in the gantry 24, the beam portion 28 can be moved up and down while maintaining a horizontal state by a known lifting mechanism (not shown) formed between the two leg portions 26 and 26. The lower surface of the beam portion 28 is a flat backing surface 29 having a length larger than the width of each of the first and second metal plates 12 and 14.

  On the other hand, the base 22 is a longitudinal rectangular block body having a length longer than the width of the first and second metal plates 12 and 14 and shorter than the length of the backing surface 29 of the beam portion 28 in the gantry 24. It is composed. Further, in the base 22, the upper surface is a flat surface 30 that is opposed to the backing surface 29 of the beam portion 28 in the gantry 24 at a predetermined distance, and this flat surface. A pressure welding coil 18 is fixed on 30. The base 22 is divided into, for example, a fixed part including a flat surface 30 on which the pressure welding coil 18 is fixed, and a base including other parts, and the fixed part. The height of the installation position of the pressure welding coil 18 may be made variable by providing a known lifting mechanism that moves the fixed portion up and down between the base portion.

  On the other hand, the pressure welding coil 18 fixed on the flat surface 30 of the base 22 has substantially the same length as the widths of the first and second metal plates 12 and 14, for example, made of chromium copper steel. It consists of a thin, long rectangular flat plate. Also, slits 32 having a relatively narrow width are formed at two locations in the center portion in the width direction of the coil 18 for pressure welding so as to extend in a straight line over substantially the entire length. The coil 18 for pressure welding as a whole is configured with a one-turn coil configuration having a substantially E shape. Further, in the pressure welding coil 18, the portion sandwiched between the two slits 32, 32 is a narrow coil intermediate portion 34, while the slit 32 is sandwiched between the coil intermediate portion 34 and the coil intermediate portion 34. The portions located on the opposite side are coil end portions 36 and 36, respectively.

  In such an electromagnetic pressure welding device 16, the discharge switch: G is closed while the capacitor: C is charged with a predetermined amount of charge, and a large pulse current (instantaneous high) is applied to the pressure welding coil 18. As a result, a high-density magnetic flux is suddenly generated along the narrow coil intermediate portion 34 where the current of the pressure welding coil 18 is concentrated.

  Thus, when the target tailored blank material 10 is manufactured using the electromagnetic pressure welding device 16 as described above, first, as shown in FIG. First and second two tables 40 and 42 supported by placing the metal plates 12 and 14 respectively are sandwiched between the bases 22 of the electromagnetic pressure welding device 16 on both sides in the width direction. Installed.

  Here, as the second table 42, the height position of the support surface 44 on which the second metal plate 14 is supported is on the upper surface of the pressure welding coil 18 fixed to the base 22 of the electromagnetic pressure welding device 16. While a height higher than the height position by a predetermined dimension is used, as the first table 40, the height position of the support surface 46 on which the first metal plate 12 is supported is the support surface 44 of the second table 42. The thickness of the second metal plate 14 is set to the height position of the upper surface of the second metal plate 14 when the second metal plate 14 is supported, that is, the height of the support surface 44 of the second table 42. What is made higher by a predetermined dimension than the added height is used. Although not shown, instead of the first and second tables 40 and 42, for example, in the same structure as the gantry 24, the height positions of the support surfaces 46 and 44 are variable. A structure having a different structure may be used.

  Next, the first metal plate 12 and the second metal plate 14 are placed and supported on the support surfaces 46 and 44 of the first table 40 and the second table 42, respectively. At this time, the first metal plate 12 and the second metal plate 14 both have the end portions to be joined, that is, the joined end portions 48 and 50, the flat surface 30 of the base 22 positioned between them. It is set as the state which protruded from the support surfaces 46 and 44 of the 1st and 2nd tables 40 and 42 to the base 22 side so that it may be located above. On the other hand, the beam portion 28 of the gantry 24 is moved up and down by a necessary amount, and the backing surface 29 of the beam portion 28 becomes the second end of the joined end portion 50 of the second metal plate 14. It can be brought into contact with the surface on the side opposite to the table 42 side, or can be opposed to the surface with a slight gap.

  As a result, as shown in FIG. 3, the first metal plate 12 and the second metal plate 14 have the joined end portions 48 of the first metal plate 12 at the joined end portions 48 and 50, respectively. In a state of being placed on the lower side, they are arranged so as to overlap each other via a gap (gap) 52. Then, under such an arrangement state, the pressure welding coil 18 is disposed on the opposite side of the joined end portion 48 of the first metal plate 12 from the overlapping surface side with the second metal plate 14. The metal plate 12 is positioned at a predetermined distance from the bonded end of the metal plate 12. In other words, the joined end portion 50 of the second metal plate 14 is positioned via the gap 52 only on the upper surface side of the joined end 48 portion of the first metal plate 12, while Only on the lower surface side of the joined end portion 48 of the metal plate 12, the pressure welding coil 18 is positioned corresponding to the joined end portion 48 of the first metal plate 12. Further, the bonded end portion 50 of the second metal plate 14 is in a state in which upward displacement is restricted by the backing surface 29 of the beam portion 28 of the gantry 24.

  In this step, the first metal plate 12 and the second metal plate 14 are respectively placed on the support surfaces 46 and 44 of the first and second tables 40 and 42 having different height positions. In this way, the gaps 52 are overlapped with each other. For example, a spacer member having a predetermined height is interposed between the first metal plate 12 and the second metal plate 14. Or in a state where air is blown in, the first metal plate 12 and the second metal plate 14 are overlapped with each other so that the bonded end portions 48 and 50 of the metal plates 12 and 14 are connected to each other. In addition, an appropriately sized gap 52 may be formed.

  Moreover, the overlap margin of the to-be-joined end parts 48 and 50 of the 1st metal plate 12 and the 2nd metal plate 14 is not specifically limited, either suitably according to the magnitude | size etc. of each metal plate 12 and 14. This is where it will be decided. Furthermore, in this step, a known insulating sheet (not shown) is interposed between the pressure welding coil 18 and the joined end portion of the first metal plate 12 as necessary.

  Then, after the first metal plate 12 and the second metal plate 14 are arranged in this way, or before or simultaneously with the arrangement, the power is supplied from the power supply device 20 on the charging circuit of the electromagnetic pressure welding device 16. The capacitor C is charged with the generated charge. The capacitance of the capacitor C is based on the electromagnetic force required for joining the metal plates 12, 14 such as the thickness and type of the first and second metal plates 12, 14 to be joined. Although it can be changed as appropriate according to differences in some of the affecting factors, it is generally about 100 to 1000 μF.

  Next, the discharge switch: G on the discharge circuit of the electromagnetic pressure welding device 16 is closed, and the electric charge stored in the capacitor: C is discharged, so that a large pulse current (instantaneous large current) is generated in the pressure welding coil 18. As a result, a high-density magnetic flux is generated along the coil intermediate portion 34 of the pressure welding coil 18.

  At this time, when the high-density magnetic flux intersects the bonded end portion 48 of the first metal plate 12 positioned corresponding to the pressure welding coil 18, the bonded end portion 48 of the first metal plate 12 An eddy current is generated inside in a direction that prevents the penetration of magnetic flux, and an electromagnetic force acting upward is instantaneously generated at the joined end portion 48 of the first metal plate 12. As a result, the joined end portion 48 of the first metal plate 12 is overlapped with the first metal plate 12 via the gap 52, and the upward displacement is restricted by the backing surface 29 of the beam portion 28 of the gantry 24. The first metal plate 12 and the second metal plate 14 are caused to collide at high speed against the bonded end portion 50 of the second metal plate 14. They are almost instantaneously pressed and almost interconnected over almost the entire width without being melted by heating.

  In such a main pressure welding process, as described above, the joined end portions 48 and 50 of the first metal plate 12 and the second metal plate 14 that are overlapped with each other via the gap 52 are joined to the pressure welding coil. The metal plates 12 and 14 are more reliably pressed against each other by the collision energy generated at that time, because the metal plate 12 and 14 are made to collide at high speed by energizing the metal plate 18. The first metal plate 12 and the second metal plate 14 do not necessarily have to be overlapped via the gap 52 depending on the type of 12, 14 and the required bonding strength. That is, the first metal plate 12 and the second metal plate 14 may be overlapped with each other at the joined end portions 48 and 50 in contact with each other.

  For example, in order to obtain a sufficient bonding strength, when the bonded end portions 48 and 50 of the first metal plate 12 and the second metal plate 14 are overlapped via the gap 52, The size of the gap 52 is preferably 5 times or less of the total thickness of the first metal plate 12 and the second metal plate 14 and a value within a range of 0.1 mm or more.

  This is because when the size of the gap 52 is more than 5 times the total thickness of the first metal plate 12 and the second metal plate 14 or less than 0.1 mm, Sufficient collision energy is obtained when the distance between the joined end portions 48 and 50 of the metal plates 12 and 14 becomes excessively large or small and the energizing coil 18 is energized. This is because it becomes difficult to improve the bonding strength due to the collision effect. Note that the lower limit of the gap 52 is set to 0.3 mm or more in order to more securely press the first metal plate 12 and the second metal plate 14 at the respective joined end portions 48 and 50. It is more desirable.

  Moreover, here, the joined end portion 48 of the first metal plate 12 made of aluminum having a higher conductivity than the second metal plate 14 made of iron among the first and second metal plates 12 and 14 is: Since it is positioned corresponding to the pressure welding coil 18, a sufficiently large eddy current is generated at the joined end portion 48 of the first metal plate 12 by energization of a large pulse current to the pressure welding coil 18. Thus, a large electromagnetic force can be generated. As a result, the first metal plate 12 and the second metal plate 14 are caused to collide with a larger collision energy and can be joined more firmly. In order to improve the bonding strength based on the difference in conductivity between the first metal plate 12 and the second metal plate 14, the conductivity of the first metal plate 12 positioned corresponding to the pressure welding coil 18 is It is desirable that the electrical conductivity of the second metal plate 14 superimposed thereon is 10% IACS or higher. Even when three or more metal plates are subjected to electromagnetic pressure welding, it is preferable that the conductivity of the metal plate positioned corresponding to the pressure welding coil 18 is 10% higher than the conductivity of the metal plate superimposed thereon. % IACS or higher.

  Then, the metal plates 12 and 14 thus pressed and integrated at the joined end portions 48 and 50 are taken out from the electromagnetic pressure welding device 16 and are used for press forming, as shown in FIG. That is, the tailored blank material 10 is obtained.

  Thus, in this embodiment, the to-be-joined end parts 48 and 50 of the 1st and 2nd metal plates 12 and 14 overlapped with each other remain in a solid phase state without being melted by heating. Since the first and second metal plates 12 and 14 are joined together by pressure welding, fusion welding or resistance welding in which the joined end portions 48 and 50 are joined by heating and melting. Unlike the case of adopting, etc., it is undeniably solved that various problems that adversely affect the joining strength of each of the joined end portions 48 and 50 occur at the time of performing such fusion welding or resistance welding. Can be done. Moreover, it is possible to advantageously avoid the occurrence of a heat-affected zone in the vicinity of the joint portion of the tailored blank material 10 to be produced, which may cause local strength reduction or breakage during press molding. Therefore, the tailored blank material 10 having stable joining quality and excellent press formability can be manufactured extremely advantageously.

  And in this embodiment, especially the 2nd metal plate 14 in the to-be-joined edge part 48 of the 1st metal plate 12 among the 1st metal plates 12 and the 2nd metal plate 14 which were mutually piled up. The pressure welding coil 18 is disposed only on the side opposite to the superposed surface side, and a large pulse current is passed through the pressure welding coil 18, whereby the first metal plate 12 and the second metal plate. 14 are bonded to each other so that the tailored blank material 10 having the excellent characteristics as described above can be manufactured.

  Therefore, in the present embodiment, for example, the pressure welding coil 18 is disposed on the opposite side of the metal plates 12 and 14 from the opposite sides, and the electromagnetic waves of the metal plates 12 and 14 are arranged. Compared with the case of performing the pressure welding operation, the number of the pressure welding coils 18 can be advantageously reduced, and accordingly, the number of the pressure welding coils 18 is reduced, so that a large pulse current is applied to the pressure welding coils 18. The capacity of the power supply device 20 and the capacitor: C that supply the pressure can be reduced, and the miniaturization and cost reduction of the pressure welding coil 18, the power supply device 20, and the electromagnetic pressure welding device 16 including the capacitor: C are advantageous. Can be illustrated.

  Therefore, according to the present embodiment as described above, it is possible to reduce the equipment cost and work cost required for the joining work of the first metal plate 12 and the second metal plate 14, and as a result, as described above, The tailored blank material 10 that exhibits such excellent characteristics can be manufactured at a lower cost.

  Moreover, in this embodiment, each to-be-joined end part of the 1st metal plate 12 and the 2nd metal plate 14 by the electromagnetic force generated in the to-be-joined end part 48 of the 1st metal plate 12 instantaneously. Since the first and second metal plates 12 and 14 are large, for example, since the first and second metal plates 12 and 14 are large, the respective joined end portions 48 and 50 are formed. Even if it becomes a little longer, the joining of each of the metal plates 12 and 14 can be completed in a very short time. Therefore, regardless of the size and the like of the metal plates 12 and 14 to be joined, The tailored blank material 10 can be advantageously manufactured with excellent production efficiency.

  Further, in the present embodiment, as described above, since the joining of the first and second metal plates 12 and 14 can be instantaneously completed, the heat input of the tailored blank material 10 to be manufactured is reduced. Occurrence of distortion and structural change due to accumulation, and accompanying appearance and strength deterioration, as well as reduction in press accuracy at the time of press molding, can be effectively prevented. Thus, the press formability of 10 can be secured stably.

  Moreover, in the present embodiment, by applying a large pulse current to the pressure welding coil 18, the welded end portions 48 and 50 of the first metal plate 12 arranged corresponding to the pressure welding coil 18 are provided. By generating electromagnetic force instantaneously, the metal plates 12 and 14 are joined to each other. Therefore, the type and thickness of the metal material that gives the metal plates 12 and 14 are simply changed. Accordingly, it is possible to obtain an advantage that the bonding strength can be stabilized very easily only by controlling the shape of the pressure welding coil 18, the magnitude of the large pulse current passed through it, the energization time, and the like. .

  By the way, in said 1st embodiment, it has the joining form which joins the 1st and 2nd metal plates 12 and 14 from which thickness differs mutually in the edge part of each length direction, and unites them. Although the example of the tailored blank material 10 was shown, the joining form of the tailored blank material 10 is not limited to this at all. That is, for example, as shown in FIG. 5, the first and second metal plates 12 and 14 having different sizes are used, and the second metal plate 14 having a smaller size is arranged in the plate thickness direction. The entire surface of one surface is integrated by forming a joint 15 between the metal plates 12 and 14 in a state of being overlapped with a part of the first metal plate 12 having a large size. The tailored blank material 10 may be configured. In FIG. 5 and FIGS. 6 to 9 to be described later, the same reference numerals as those in the first embodiment are used for the members and parts having the same structure as that in the first embodiment. The explanation was omitted.

  And when manufacturing the tailored blank material 10 which has the joining form formed by integrally joining the first and second metal plates 12 and 14 having different sizes, for example, first, The small second metal plate 14 is in contact with or overlapped with a part of the surface of the first metal plate 12 having a large size over the entire surface of one surface. The In addition, when these 1st and 2nd metal plates 12 and 14 are piled up through a predetermined gap, for example, a suitable spacer is provided between the first metal plate 12 and the second metal plate 14. The gap is secured by interposing the member 54 (see FIG. 6) or by blowing air or the like to float the second metal plate 14 or the like.

  Next, as shown in FIG. 6, the electromagnetic pressure welding device 16 used when manufacturing the tailored blank material 10 of the first embodiment and the heights of the support surfaces 46 and 44 are the same. The first and second tables 40 and 42 are used, and the second metal plate 14 is superposed on both sides of the electromagnetic pressure welding device 16 with the first and second tables 40 and 42 positioned respectively. The first metal plate 12 is placed and supported on the support surfaces 46 and 44 of the first and second tables 40 and 42 on both sides of the overlapping portion with the second metal plate 14.

  Then, similarly to the first embodiment, a large pulse current is passed through the pressure welding coil 18, and the portion to be joined to the second metal plate 14 in the first metal plate 12, that is, the second The first and second metal plates 12 and 14 are caused to be generated by instantaneously generating an electromagnetic force acting in a direction in which the metal plate 14 is superimposed on the second metal plate 14 in the direction of being pressed against the second metal plate 14. Then, the superposed portions are instantaneously pressed and integrated with each other, and the desired tailored blank material 10 as shown in FIG. 5 is obtained.

  In addition, when the 2nd metal plate 14 with a small magnitude | size among the 1st and 2nd metal plates 12 and 14 to be joined is wider than the coil 18 for pressure welding, for example, first, The first and second metal plates 12 and 14 overlapped with each other are arranged so as to be positioned corresponding to the pressure welding coil 18 on one side in the width direction of the second metal plate 14 having a small size. The first and second metal plates 12 and 14 are joined to each other at a portion on one side in the width direction of the second metal plate 14.

  Next, the first and second metal plates 12 and 14 overlapped with each other are arranged on the other side in the width direction of the second metal plate 14 so as to be positioned corresponding to the pressure welding coil 18. And the 2nd metal plates 12 and 14 are joined mutually in the site | part of the width direction other side of the 2nd metal plate 14. As shown in FIG.

  As a result, as shown in FIG. 7, both ends in the width direction of the second metal plate 14 having a smaller size between the first metal plate 12 and the second metal plate 14 having different sizes. The intended tailored blank material 10 in which the joining parts 15 and 15 are respectively formed on the part side is obtained.

  Thus, even in the present embodiment, the first and second metal plates 12 and 14 are overlapped with each other, and the pressure welding coil 18 disposed only on one side in the overlapping direction is provided. The effects produced in the first embodiment can be advantageously enjoyed from the fact that the electromagnetic welding is used to instantaneously join them without melting them at all.

  In this embodiment, in particular, the first and second metal plates 12 and 14 having different sizes are used, and the second metal plate 14 having a small size has a large size on the entire surface. The tailored blank material 10 partially reinforced by the second metal plate 14 having a small size is extremely easy because the first metal plate 12 is joined and integrated. It can be manufactured at low cost.

  In the first and second embodiments, the flat plate-like first and second metal plates 12 and 14 having a predetermined size are joined to each other to produce a single tailored blank 10. For example, as the first and second metal plates 12 and 14 to be joined, long thin plates wound so as to form predetermined coils are used, respectively. It is also possible to continuously join each of the coils made of the first and second metal plates 12 and 14 while gradually unwinding them.

  That is, here, as shown in FIG. 8, first, the first coil 56 in which the first metal plate 12 is wound and the second coil 58 in which the second metal plate 14 is wound. And the unwinding portion 60 of the first metal plate 12 and the unwinding portion 62 of the second metal plate 14 are in contact with each other at one end in the width direction. Alternatively, they are positioned so as to be overlapped with each other via the gap (52) (only the state of being overlapped in contact with each other is shown in FIG. 8). When the unwinding portions 60 and 62 of the first and second coils 56 and 58 are overlapped via the gap (52), for example, an appropriate spacer member is provided between the unwinding portions 60 and 62. The gap (52) having a predetermined size is secured by interposing the air or by blowing air or the like. In FIG. 8, 64 is a deflector roll.

  Subsequently, the electromagnetic pressure welding device 16 having the same structure as that used in manufacturing the tailored blank material 10 of the first and second embodiments is used, and the first and the second are overlapped with each other as described above. The unwinding portion 60 of the metal plate 12 and the unwinding portion 62 of the second metal plate 14 overlap the unwinding portion 62 of the second metal plate 14 in the unwinding portion 60 of the first metal plate 12. On the side opposite to the mating surface side, the pressure welding coil 18 of the electromagnetic pressure welding device 16 is disposed so as to be positioned correspondingly. At this time, the coil 18 for pressure welding is positioned so that the coil intermediate portion 34 extends along the length direction of the unwinding portions 60 and 62.

  Thereafter, in the same manner as in the first and second embodiments, a large pulse current is passed through the pressure welding coil 18, and the unwinding portion 60 of the first metal plate 12 positioned corresponding to the pressure welding coil 18. The electromagnetic force is instantaneously generated at the parts to be joined, so that the unwinding part 60 of the first metal plate 12 and the unwinding part 62 of the second metal plate 14 are to be joined. The end portions in the direction are instantaneously pressed against each other to be integrated.

  Then, the first and second coils 56 and 58 are gradually rewound, and the above-described operations for pressing the unwinding portions 60 and 62 are continuously and repeatedly performed. The long first and second metal plates 12 and 14 forming the coils 56 and 58, respectively, are joined and integrated over the entire length, while the integrated first and second first and second metal plates 12 and 14 are combined. The joined body of the metal plates 12 and 14 is cut by a known cutting machine 66 at a predetermined interval.

  As a result, as shown in FIG. 9, the target tailored blank material 10 in which the joining portion 15 is formed between the first and second metal plates 12, 14 between the respective end portions in the width direction is provided. Many will be obtained.

  As described above, even in the present embodiment, the unwinding portions 60 and 62 of the first and second metal plates 12 and 14 are arranged only on one side in the overlapping direction in a state where they are overlapped with each other. The effect exhibited in the first and second embodiments is that the electromagnetic pressure welding using the pressure welding coil 18 is instantaneously joined without being melted at all. Either can be enjoyed advantageously.

  In the present embodiment, in particular, the first and second coils 56 and 58 are gradually rewound, the unwinding portions 60 and 62 are pressed, and the resulting joined body is cut at a predetermined interval. By repeating this operation, the desired tailored blank material 10 can be manufactured continuously, in large quantities, and easily and quickly. As a result, the production cost of the tailored blank material 10 can be further increased. This can be effectively reduced.

  Further, in the three embodiments, the first and second metal plates 12 and 14 are instantaneously electromagnetically welded to produce the tailored blank material 10 that is the target press-forming blank material. Of course, it is also possible to manufacture a press-molding blank by instantaneously electromagnetically welding two or more metal plates. In that case, all of the three or more metal plates are arranged with the remaining metal plate positioned only on one surface side of one of the three or more metal plates. However, in the parts to be joined, they are sequentially overlapped in contact with each other or through a predetermined gap, while the pressure welding coil is provided only on the other surface side of the single metal plate. Corresponding positions are provided at intervals in the thickness direction with respect to the bonded portion of the single metal plate, and the electromagnetic pressure welding operation is performed under such an arrangement state.

  In addition, when performing the pressure welding operation of the plurality of metal plates, the metal plate to be positioned corresponding to the pressure welding coil has a conductivity that easily causes a large eddy current among the plurality of metal plates, as described above. Those having a high value are preferably selected. Therefore, when a plurality of metal plates to be joined are made of the same type of material, for example, among these metal plates, a metal plate having a thin plate thickness and hence high conductivity is used for pressure welding. Corresponding to the coil. Thereby, a some metal plate will be joined more firmly.

  In addition, in the above-described three embodiments, the present invention was applied to a tailored blank material that is a blank material for press molding that gives an interior panel of an automobile and a method for manufacturing the same. Needless to say, the present invention can be advantageously applied to any press-molding blank used for other than automobile interior panels and its manufacturing method.

  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. It goes without saying. In addition to the following examples, the present invention includes various modifications based on the knowledge of those skilled in the art without departing from the spirit of the present invention other than the above-described embodiments. It should be understood that modifications, improvements, etc. may be made.

<Example 1>
First, the plate thickness is 1.2 mm, each made of aluminum, 1050 aluminum alloy, 5182 aluminum alloy, 6016 aluminum alloy, iron with zinc plated on the surface, iron with no plating on the surface, and copper. While a plurality of 3.2 mm metal plates were prepared, an electromagnetic pressure welding apparatus having a structure as shown in FIG. 2 and a known insulating sheet were prepared.

  Next, two metal plates were selected from among the prepared plurality of metal plates by combinations of types and plate thicknesses as shown in Table 1 below. At this time, at least one of the two selected metal plates was a metal plate made of aluminum or an aluminum alloy. Then, the two selected metal plates are brought into contact with each other at the end portions in the length direction, and are superposed. On the other hand, of the two superposed metal plates, a metal made of aluminum or an aluminum alloy. The coil for pressure welding of the electromagnetic pressure welding device was placed in a corresponding position on the side opposite to the superposed surface side of the plate with another metal plate at a predetermined interval and with an insulating sheet interposed therebetween.

  After that, by applying a large pulse current to the pressure welding coil, an electromagnetic force is instantaneously generated at the overlapping position of the metal plate made of aluminum or aluminum alloy positioned corresponding to the pressure welding coil. The two metal plates were instantaneously electromagnetically welded to each other at the polymerization sites and integrated to obtain the intended tailored blank material.

  In this way, the two metal plates selected by the combination of the type and thickness shown in Table 1 below are all electromagnetically welded and integrated to form two pieces to be joined. Eleven types of tailored blanks (Test Examples 1 to 11) with different combinations of metal plate types and plate thicknesses were obtained. Here, the electromagnetic pressure welding was performed by charging a capacitor power source of 380 μF with energy of 1 to 20 kJ, then discharging it, and flowing a large pulse current through the coil.

  Then, using the tailored blank materials of Test Examples 1 to 11 obtained in this manner, whether or not there is a heat affected zone in the vicinity of the joining portion is examined with a Vickers hardness meter, and a disk with a diameter of 100 to 120 mm A test piece having a joining line at the center of the sample was subjected to a φ40 mm ball head overhang test, and the presence or absence of occurrence of “cracking” at a height of 15 mm was visually confirmed. The results are shown in Table 1 below. Furthermore, when manufacturing the tailored blank materials of Test Examples 1 to 11, the joining time per 100 mm joining length in the time required for joining the two metal plates was calculated. The results are also shown in Table 1 below.

  For comparison, while using metal plates made of 6016 aluminum alloy with a plate thickness of 1.2 mm and 3.2 mm, they are arranged so as to overlap each other at the lengthwise ends, The two kinds of metal plates were joined and integrated by performing MIG welding on the polymerization site, and a tailored blank material (Comparative Example 1) in which a joint portion was formed by MIG welding was obtained. Further, three metal plates each having the same type and thickness as the first and second metal plates that give the tailored blank material of Comparative Example 1 were prepared, and one of the metal plates having different plate thicknesses was prepared. The selected first and second metal plates are overlapped with each other at the lengthwise ends, and then laser welding, seam welding, friction are applied to their overlapping portions. By performing stir welding (FSW), three types of tailored blank materials (joint portions formed respectively by these three types of joining methods were obtained. Among these three types of tailored blank materials, laser welding was performed. The tailored blank material in which the joint portion is formed is referred to as Comparative Example 2, the tailored blank material in which the joint portion is formed by seam welding is referred to as Comparative Example 3, and friction stir welding ( The tailored blank the junction is formed by SW) and Comparative Example 4.

  And using the tailored blank material of Comparative Examples 1 to 4 obtained in this way, the presence or absence of the heat affected zone and the “crack” in the ball head overhang test in the same manner as the tailored blank material of Test Examples 1 to 11 above. The presence or absence of occurrence and the joining time per 100 mm joining length were examined. The results are shown in Table 2 below.

  As is apparent from the results of Tables 1 and 2, according to the method of the present invention, two metal plates that are superposed on each other are placed on a pressure welding coil that is disposed only on one side of both sides sandwiching them. In the tailored blank materials of Test Examples 1 to 11 manufactured by electromagnetic pressure welding by flowing a large pulse current, there is no heat-affected zone, and “cracking” occurs at all in the ball head overhang test. Furthermore, the joining time per 100 mm joining length was also extremely short, 0.1 seconds. On the other hand, unlike the method of the present invention, in the tailored blank material of Comparative Examples 1 to 4 in which two metal plates are joined by MIG welding, laser welding, seam welding, friction stir welding, etc., In addition to the presence of the heat affected zone, “cracking” occurred in the ball head overhang test, and the joining time per 100 mm joining length was about 1.5 to 30 seconds.

  From these things, the tailored blank materials of Test Examples 1 to 11 manufactured according to the method of the present invention were more stable than the tailored blank materials of Comparative Examples 1 to 4 manufactured by a method different from the method of the present invention. It can be clearly recognized that it has joint quality and excellent productivity, as well as high press formability.

<Example 2>
First, a plurality of metal plates each having a thickness of 0.5 mm, 1 mm, and 2 mm and having different sizes, each made of the same type of metal material as the metal plate prepared in Example 1, are prepared. Electromagnetic pressure welding apparatus having the same structure as the electromagnetic pressure welding apparatus used in the manufacture of the tailored blank material (Test Examples 1 to 11) in Example 1 except that the surface of the coil for use is insulated. Prepared.

  Next, three metal plates were selected from among the prepared plurality of metal plates by combinations of types and plate thicknesses as shown in Table 3 below. At this time, at least one of the three selected metal plates was made to be a metal plate made of aluminum or an aluminum alloy. Of the selected three metal plates, the remaining two metal plates are arranged on one side of the metal plate made of aluminum or aluminum alloy, and the small metal plate is large on the entire surface. While being positioned so as to contact the metal plate, the three metal plates are overlapped with each other, and the pressure welding coil of the electromagnetic pressure welding device is placed on the other surface side of the metal plate made of aluminum or aluminum alloy. The corresponding positions were separated by a predetermined interval.

  Thereafter, in the same manner as in Example 1, three metal plates were electromagnetically welded and integrated, and seven types of tailored blank materials (test examples 12 to 18) having different combinations of metal plate types and plate thicknesses were used. ) The conditions for electromagnetic pressure welding here were the same as those in Example 1.

  And using the tailored blank materials of Test Examples 12 to 18 thus obtained, the presence or absence of the heat affected zone in each of the tailored blank materials, the presence or absence of occurrence of “crack” in the ball head overhang test, and the bonding length per 100 mm The bonding time was examined in the same manner as in Example 1. The results are also shown in Table 3 below. The conditions of the ball head overhang test here were also the same as in Example 1. In addition, as a test piece used for the ball head extension test, a test piece was used in which the respective joining lines of the three metal plates joined were positioned at the center.

  As is apparent from the results of Table 3 above, in accordance with the method of the present invention, a small metal plate is overlapped with a large metal plate over the entire surface, and three metal plates stacked on each other are sandwiched between them. Even in the tailored blank materials of Test Examples 12 to 18 manufactured by electromagnetic pressure welding by flowing a large pulse current through the pressure welding coil arranged only on one of the two sides, the test in Example 1 was performed. Similar to the tailored blank materials of Examples 1 to 11, there was no heat-affected zone, no “cracking” occurred in the ball head overhang test, and the joining time per 100 mm joining length was 0. It was an extremely short time of 1 second. Thus, it is clearly recognized that the tailored blank materials of Test Examples 12 to 18 manufactured according to the method of the present invention have stable joint quality, excellent productivity, and high press formability. To get.

<Example 3>
First, a plurality of metal plates having a thickness of 1.2 mm and 3.2 mm, each made of the same type of metal material as the metal plate prepared in Example 1, are prepared, and the object is in Example 1. The electromagnetic pressure welding apparatus and the insulating sheet used for manufacturing the tailored blank material (Test Examples 1 to 11) were prepared.

  Next, two metal plates were selected from among the plurality of prepared metal plates by combinations of types and plate thicknesses as shown in Table 4 below. At this time, at least one of the two selected metal plates was a metal plate made of aluminum or an aluminum alloy. Then, the two selected metal plates are overlapped with each other at the end portions in the length direction through a gap having a size as shown in Table 4 below. Among the plates, a metal plate made of aluminum or an aluminum alloy is placed on the opposite side of the superposed surface of the metal plate with another metal plate, and a coil for pressure welding of the electromagnetic pressure welding device is provided at a predetermined interval and through an insulating sheet. , Put it in the corresponding position.

  Thereafter, in the same manner as in Example 1, two metal plates were electromagnetically welded and integrated, and the types of metal plates and combinations of plate thicknesses were different from each other, and the size of the gap during the electromagnetic pressure welding operation was also different. 11 different tailored blank materials (Test Examples 19 to 29) were obtained. The conditions for electromagnetic pressure welding here were the same as those in Example 1.

  Then, using the tailored blank materials of Test Examples 19 to 29 obtained in this manner, the presence or absence of the heat affected zone in each of the tailored blank materials, the presence or absence of occurrence of “cracking” in the ball head overhang test, and the bonding length per 100 mm The bonding time was examined in the same manner as in Example 1. The results are also shown in Table 4 below. The conditions of the ball head overhang test here were also the same as in Example 1.

  As is apparent from the results in Table 4 above, in accordance with the method of the present invention, two metal plates that are overlapped with each other via a gap are arranged on only one side of both sides sandwiching them. Even in the tailored blank material of Test Examples 19 to 29 manufactured by electromagnetic pressure welding by flowing a large pulse current, the thermal effect is similar to the tailored blank material of Test Examples 1 to 11 in Example 1. No part was present, no “cracking” occurred in the ball head overhang test, and the joining time per 100 mm joining length was 0.1 seconds, which was extremely short. Thus, according to the method of the present invention, the tailored blank materials of Test Examples 19 to 29 manufactured by electromagnetic pressure welding two metal plates stacked on each other through a gap have stable bonding quality and excellent productivity. Furthermore, it can be clearly recognized that it has high press formability.

It is longitudinal section explanatory drawing which shows an example of the tailored blank material manufactured according to this invention technique. It is explanatory drawing which shows an example of the process of manufacturing the tailored blank material shown by FIG. 1, Comprising: Two metal plates which give this tailored blank material are mutually overlapped through the gap, and an electromagnetic pressure welding apparatus The set state is shown. It is III-III cross-section expansion explanatory drawing in FIG. It is IV-IV cross-sectional explanatory drawing in FIG. It is a longitudinal cross-sectional explanatory drawing which shows another example of the tailored blank material manufactured according to this invention technique. It is a figure corresponding to FIG. 2 which shows an example of the process of manufacturing the tailored blank material shown by FIG. It is upper surface explanatory drawing which shows the other example of the tailored blank material manufactured according to this invention method. FIG. 8 is an explanatory view showing an example of a process for producing a tailored blank material further different from the tailored blank material shown in FIGS. 1, 5, and 7 according to the method of the present invention. The metal plate is set in an electromagnetic pressure welding apparatus, and the joined body joined first is cut. It is upper surface explanatory drawing which shows the tailored blank material manufactured according to this invention method shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tailored blank material 12 1st metal plate 14 2nd metal plate 16 Electromagnetic pressure welding apparatus 18 Coil 48, 50 Joined end part 52 Gap 56, 58 Coil 60, 62 Unwinding part

Claims (8)

A method of manufacturing a blank material used for press molding by joining and integrating a plurality of metal plates,
In a state where the other metal plate is positioned only on one surface side of one of the plurality of metal plates, the plurality of metal plates are connected to each other. In this case, the coils are sequentially overlapped in contact with each other or through a predetermined gap, and a pressure welding coil is placed only on the other surface side of the one metal plate with respect to the bonded portion of the one metal plate. After positioning the corresponding position with a gap in the plate thickness direction, an instantaneous large current is applied to the coil for pressure welding, and the metal plate is overlapped with the metal plate to be joined to the bonded portion of the one metal plate. By instantly generating an electromagnetic force that acts in the direction of pressing against the bonded parts, the plurality of metal plates are instantaneously pressed against each other at the bonded parts to be integrated. Press molding bra Method of manufacturing a click material.   When the plurality of metal plates are sequentially overlapped with each other at a portion to be joined via a predetermined gap, the size of the gap is determined by the gap among the plurality of metal plates. The manufacturing method of the blank material for press molding of Claim 1 which is 5 times or less of the sum total thickness of the two metal plates overlap | superposed and set to the value within the range of 0.1 mm or more.   At least one of the plurality of metal plates is composed of a plate material made of aluminum or an aluminum alloy, and the one metal plate, of the plurality of metal plates, to which the coil for pressure welding is positioned correspondingly, The manufacturing method of the blank material for press molding of Claim 1 or Claim 2 comprised by the one thing of the board | plate material which consists of this aluminum or aluminum alloy.   The plurality of metal plates have different thicknesses, and of the plurality of metal plates, the one metal plate on which the pressure welding coil is positioned correspondingly is the metal plate having a different thickness. The manufacturing method of the blank material for press molding of Claim 1 or Claim 2 comprised by the thin metal plate among them.   The plurality of metal plates have different conductivities, and the conductivity of the one metal plate on which the pressure welding coil is positioned correspondingly is the one metal plate. The manufacturing method of the blank material for press molding of Claim 1 or Claim 2 made higher by 10% IACS or more than the electrical conductivity of the said metal plate piled up.   As the plurality of metal plates, a plurality of long thin plates wound so as to form a predetermined coil are used, and each of the plurality of coils made of the plurality of metal plates is gradually unwound, and the plurality of the plurality of metal plates In the state where the unwinding part of the other metal plate is positioned only on one surface side of the unwinding part of one of the multiple metal plates unwound from the coil, respectively. The unwinding portions of the metal plates are sequentially brought into contact with each other or through a predetermined gap, while the pressure welding coil is disposed only on the other surface side of the unwinding portion of the one metal plate. After positioning the corresponding position of the unwinding portion of one metal plate with a gap in the plate thickness direction, an instantaneous large current is passed through the welding coil, and the unwinding portion of the one metal plate The electromagnetic force is generated instantaneously Then, by repeatedly performing the operation of pressing the unwinding portions of the plurality of metal plates to each other, the plurality of metal plates are continuously pressed and integrated for each unwinding portion. The manufacturing method of the blank material for press molding in any one of Claims 1 thru | or 5 which cut | disconnects the joined body of these several metal plate integrated at a predetermined space | interval. As the plurality of metal plates, plate materials having different sizes are used, and the other metal plate is positioned only on one surface side of one metal plate of the plurality of metal plates. The plurality of metal plates are brought into contact with each other on a whole surface of one surface of the metal plate having a small size and a part of the surface of the metal plate having a large size, or through a predetermined gap, While sequentially superposing, only the other surface side of the one metal plate was placed with a pressure welding coil corresponding to the portion to be joined of the one metal plate with a gap in the plate thickness direction. Thereafter, the plurality of metal plates are brought into pressure contact with each other by causing a momentary large current to flow through the coil for pressure welding and instantaneously generating the electromagnetic force at the bonded portion of the one metal plate. The manufacturing method of the blank material for press molding of Claims 1 thru | or 5. A blank material for press molding obtained by the production method according to any one of claims 1 to 7.

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