JP3654210B2 - Method for forming hydroform of laminated plate material, apparatus therefor and laminated plate material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydroforming technique for a laminated plate material in which a laminated plate material formed by superimposing metal plates is formed into a molded product that conforms to a concave shape of a mold by a hydroform molding method.
[0002]
[Prior art]
A technique is known in which a laminated plate material is molded into a molded product that conforms to the shape of the concave portion of the mold by a hydroform molding method (see, for example, Japanese Patent Laid-Open Nos. 11-347643 and 10-85944). .
[0003]
Prior to putting into a mold, the overlapped plate material is welded and joined to the edges of the overlapped metal plates all around.
[0004]
[Problems to be solved by the invention]
However, since the entire outer periphery of the overlapped metal plate is welded, when the overlapped plate material is deep-drawn, the molded product is formed such as wrinkles and cracks due to non-uniform material inflow. There is a problem that a defect in quality occurs or a defect in welding quality such as peeling occurs in a welded part.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a method for forming a laminated plate hydroform, an apparatus for the same, and a laminated plate that can suppress degradation of molding quality and welding quality.
[0006]
[Means for Solving the Problems]
The object of the present invention is achieved by the following means.
[0007]
  (1)Place the overlapped metal plate including the corner and the side located between the adjacent corners into the mold with the recess.In the hydroform molding method of the laminated plate material, in which an internal pressure is applied between the metal plates, and a molded product that matches the shape of the concave portion is formed.
  By deforming inward from the contour before molding, welding is applied to the side that forms the part that supplies the material necessary for molding, and inflow of material is restricted to prevent wrinkles from occurring in the molded product Without welding the corners that make upThe metal platesTheJoiningdidPut the overlapping plate material in the mold,
  WeldedThe sideMaterial is allowed to flow in and is not weldedThe cornerA method for hydroforming a laminated plate material, characterized in that an internal pressure is applied between the metal plates while performing a composite forming of an overhang forming and a drawing forming while restricting the inflow of the material.
[0010]
  (2) An injection port for injecting a medium for applying an internal pressure between the metal plates,The cornerThe method for hydroforming a laminated plate material according to (1) above, wherein the method is preformed.
[0011]
  (3) When the mold nozzle for supplying the medium is inserted into the injection port, the injection port is ironed by the mold and the mold nozzle and is finally molded (2) Hydroform forming method of the laminated plate material according to.
[0012]
  (4)The sideOrThe cornerThe welding was performed by adjusting the plate presser pressure atThe sideThe method for hydroforming a laminated plate material according to the above (1), wherein the material inflow amount is controlled.
[0013]
  (5The method for hydroforming a laminated plate material according to the above (1), wherein at least one of the metal plates constituting the laminated plate material has a portion having a different thickness.
[0014]
  (6)In a hydroforming apparatus for a laminated plate material for hydroforming a molded product from a superimposed metal plate including a corner and a side located between adjacent corners,
  By deforming inward from the contour before molding, welding is applied to the side that forms the part that supplies the material necessary for molding, and inflow of material is restricted to prevent wrinkles from occurring in the molded product Without welding the corners that make upThe metal platesTheJoiningdidAn up-and-down mold that can move relative to and away from each other,
  A recess provided in the upper and lower molds;
  WeldedThe sideFirst presser means for pressing
  Provided independently of the first presser means and not weldedThe cornerA second presser means for holding
  A mold nozzle for supplying a medium for applying an internal pressure between the metal plates;
  The sideOrThe cornerAnd a means for adjusting the plate presser pressure at
  WeldedThe sideAllow inflow of material atThe corners not weldedThe medium was supplied from the mold nozzle and internal pressure was applied between the metal plates while restricting the inflow of the material, and composite molding of bulging molding and drawing molding was performed, which matched the shape of the recess. Hydroform molding equipment for laminated plate material for molding molded products.
[0015]
  (7) The laminated plate material has a preformed injection port for injecting the medium,
  When the mold nozzle is inserted into the injection port, the injection port is ironed by the upper and lower molds and the mold nozzle, and is finally molded (6The hydroforming apparatus for laminated plate materials as described in 1).
[0016]
  (8) At least one of the metal plates constituting the laminated plate material has a portion having a different plate thickness (6The hydroforming apparatus for laminated plate materials as described in 1).
[0017]
  (9)A metal plate including a corner and a side located between adjacent corners,In the laminated plate material that is hydroformed into a molded product that matches the shape of the recess provided in the mold,
  By deforming inward from the contour before molding, welding is applied to the side that forms the part that supplies the material necessary for molding, and inflow of the material is restricted to prevent wrinkles from occurring in the molded product The metal plates were joined to each other without welding at the corners forming the parts to beA laminated board material characterized by that.
[0018]
  (10) At least one of the metal plates constituting the laminated plate material has a portion having a different plate thickness (9).
[0019]
  (11) WeldedThe sideTheNeighborhoodThe hydroforming method as described in (1) above, wherein the mold is pressed by a mold that does not contact the welded portion.
[0020]
  (12) The first presser meansSaidWeldedThe sideThe above-mentioned (characterized in that a gap that does not contact the welded portion is provided (6) Hydroform molding apparatus.
[0021]
  (13) The first presser meansSaidWeldedThe sideThe above-mentioned feature is characterized in that a blocking means is provided for preventing the welded portion in the sheet from entering the recess.6) Hydroform molding apparatus.
[0022]
  (14The blocking means locks the raised portion of the welded portion protruding from the metal plate.13) Hydroform molding apparatus.
[0023]
  (15The blocking means isSaidWeldedThe sideThe bulging portion provided at an inner position than the welded portion is locked to the above (13) Hydroform molding apparatus. "is.
[0024]
【The invention's effect】
The present invention configured as described above has the following effects.
[0025]
  Claim1According to the invention described in (2), focusing on the range that allows the inflow of material and the range that restricts the inflow of material,NeighborhoodHydroforming is performed on the laminated plate material that is welded only to the metal plates and the metal plates are joined to each other. Therefore, defects in molding quality such as wrinkles and cracks, and defects in welding quality such as peeling occur in the welded part. Can be prevented.
[0026]
  Claim2According to the invention described in (1), since the injection port is preformed at a site where the inflow of the material is restricted, a gap is not generated in the vicinity of the injection port at the time of hydroforming, so that leakage of the medium can be prevented.
[0027]
  Claim3According to the invention described in the above, since the injection port is formed by ironing when the mold nozzle is inserted, the inner peripheral surface of the injection port is pressed against the outer peripheral surface of the cylindrical portion, and the injection port and the mold There is no gap between the nozzle and the medium leakage can be prevented more reliably.
[0028]
  Claim4According to the invention described in the above, welding was performed.NeighborhoodThe amount of material flowing in is controlled, and composite molding of bulging and drawing can be performed on the laminated plate material without causing cracks and the like.
[0029]
  Claim5In the case of assembling press-formed parts together, a composite product is obtained by compositely forming a laminated plate material made of metal plates having different plate thicknesses according to required strength, etc. In comparison with the above, the molding process can be remarkably simplified and the required strength performance can be easily met. Furthermore, the number of molds required for molding can be reduced, and the manufacturing cost and material cost can be reduced.
[0030]
  Claim6According to the invention described in (3), it is possible to prevent the occurrence of defects in molding quality such as wrinkles and cracks and defects in welding quality such as peeling at the welded site. In addition, welding was performedNeighborhoodThe amount of material inflow can be controlled by the adjusting means, and composite molding of bulging and drawing can be performed on the laminated plate material without causing cracks.
[0031]
  Claim7According to the invention described above, since the injection port is ironed and finally formed when the mold nozzle is inserted, leakage of the medium can be reliably prevented.
[0032]
  Claim8According to the invention described in claim5As in the invention described in (1), the molding process can be remarkably simplified and the required strength performance can be easily met as compared with the case where the press-molded parts are assembled. Furthermore, the number of molds required for molding can be reduced, and the manufacturing cost and material cost can be reduced.
[0033]
  Claim9According to the invention described in (2), focusing on the range that allows the inflow of material and the range that restricts the inflow of material,NeighborhoodBecause it is a laminated plate material that welds only to the metal plates and joins the metal plates together, even with hydroforming, defects in molding quality such as wrinkles and cracks, and defects in welding quality such as peeling at the welded part Does not occur.
[0034]
  Claim10According to the invention described in the above, it is possible to provide a laminated plate material that can remarkably simplify the molding process and can easily meet the required strength performance as compared with the case of assembling the press-molded parts. Furthermore, it is possible to provide a laminated plate material that can reduce the number of molds required for molding and can reduce manufacturing costs and material costs.
[0035]
  Claim11According to the invention described in (1), it is possible to prevent defects in welding quality such as peeling from occurring in the welded portion. Furthermore, since pre-processing for the welded portion is not necessary, the manufacturing cost is not increased.
[0036]
  Claim12According to the invention described in (1), it is possible to prevent defects in welding quality such as peeling from occurring in the welded portion. Furthermore, since pre-processing for the welded portion is not necessary, the manufacturing cost is not increased.
[0037]
  Claim13~ Claim15According to the invention described in (2), it is possible to prevent the welded portion from entering the recess and prevent the metal plate in the welded portion from being peeled off. In addition, welding was performedNeighborhoodTherefore, the material cost can be reduced.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0039]
FIG. 1 (A) is a perspective view showing an example of a molded article 10 formed by hydroforming by applying the present invention, and FIG. 1 (B) is a perspective view showing a laminated plate material 20 before molding. (C) is sectional drawing which follows the 1-1 line | wire of FIG. (B). FIG. 2 (A) is a plan view showing a location where welding is performed on the overlapping plate material 20, FIG. 2 (B) is a plan view showing the overlapping plate material 20 after hydroforming, and FIG. A sectional view taken along line 2-2 of FIG. (B) and FIG. (D) are sectional views in an example in which the welding position is modified.
[0040]
A molded product 10 shown in FIG. 1A is molded by a hydroform molding method in which a metal plate overlapped in a mold provided with a recess and an internal pressure is applied between the metal plates. The molded product 10 has an outer surface shape that matches the inner surface shape of the recess.
[0041]
As shown in FIGS. 1B and 1C, the overlapping plate material 20 is configured by overlapping a plurality of (two in the illustrated example) metal plates 21 and 22. The metal plates 21 and 22 have portions with different plate thicknesses according to the strength required for the molded product 10. That is, a plate material 23 smaller than the area of the metal plate 21 is overlapped and welded to the upper surface of the metal plate 21 shown on the upper side in the drawing, and the metal plate 22 is applied to the lower surface of the metal plate 22 shown on the lower side in the drawing. A plate material 24 smaller than the area is overlap welded. The plate members 23 and 24 are overlap-welded at positions where high strength is required for the molded product 10 because the molded product 10 needs to be connected to other components.
[0042]
As shown in FIG. 2, the overlapping plate material 20 is formed by applying welding 26 only to the plate holding portion 25 in a range in which the inflow of material is allowed at the time of hydroforming, among the edge portions of the overlapping metal plates 21 and 22. The plates 21 and 22 are joined together. For the welding, a method such as plasma welding or laser welding is used. In FIG. 2 (B), the outline of the laminated plate material 20 before forming is indicated by a two-dot chain line. As clearly shown in FIGS. 2 (B) and 1 (A), the plate retainer 25 to which the weld 26 is applied corresponds to the portion 11 that exhibits a substantially linear shape in the shape of the molded product. Further, the other plate pressing portions 27 not subjected to the welding 26 correspond to the portion 12 having a curvature in the shape of the molded product and the corner portion 13 of the molded product 10. In the following description, the plate pressing portion 25 to which the welding 26 is applied is also referred to as “joining plate pressing portion 25”.
[0043]
Referring to FIGS. 1A and 2B, an injection port 28 for injecting a medium for applying an internal pressure between the metal plates 21 and 22 is located in the other plate pressing portion 27 and is pressed. Etc. are preformed. Since the injection port 28 is formed at a portion where the inflow of the material is restricted, a gap does not occur in the vicinity of the injection port 28 at the time of hydroforming, and the medium can be prevented from leaking. For example, water is used as the medium.
[0044]
FIGS. 3A and 3B are cross-sectional views showing the main part of the hydroform molding apparatus 30, and FIG. 4 is a diagram showing the overlapping plate material 20 being molded by the hydroform molding apparatus 30. 3A shows a cross section of the hydroform molding device 30 along the line 3A-3A in FIG. 4, and FIG. 3B shows the hydroform molding device along the line 3B-3B in FIG. 30 shows a cross section. FIG. 3 (A) shows a state during hydroforming, and FIG. 3 (B) shows a state immediately before hydroforming is finished.
[0045]
As shown in FIGS. 3 (A) and 3 (B), the hydroform molding apparatus 30 includes an upper mold 31, a lower mold 32, an upper and lower mold 31, which are provided so as to be relatively close to and away from each other. Cup-shaped recesses 33 and 34 provided in each of 32, the first pressing means 41 for pressing the joining plate pressing portion 25, and the first pressing means 41 are provided independently to press the other plate pressing portion 27. The second presser means 42 and a mold nozzle 50 for supplying a medium for applying an internal pressure between the metal plates 21 and 22 are provided. The hydroform molding device 30 further includes an adjusting means 60 that can change the plate pressing pressure in the bonded plate pressing portion 25.
[0046]
As shown in FIGS. 3B and 4, the first pressing means 41 is disposed at a position for pressing the joining plate pressing portion 25. In the illustrated example, four first pressing means 41 are provided in each of the upper and lower molds 31 and 32. Each of the first pressing means 41 includes a plate pressing block 43, a mold 44, and a hydraulic pressure supply chamber 45 to which hydraulic pressure is supplied. The hydraulic pressure supply chamber 45 is disposed between the plate pressing block 43 and the mold 44 and is supplied with hydraulic pressure from the hydraulic pressure supply device 61. By adjusting the supplied hydraulic pressure, the clearance between the pressing surface of the plate pressing block 43 on the upper die 31 side and the pressing surface of the plate pressing block 43 on the lower die 32 side is adjusted. The plate presser pressure is controlled. The adjusting means 60 is configured by the hydraulic pressure supply chamber 45, the hydraulic pressure supply device 61, and the like.
[0047]
As shown in FIG. 3 (A), the second pressing means 42 is disposed at a position for pressing the other plate pressing portion 27 that is not welded 26. The second pressing means 42 includes a general blank holder 46 and a die 47. In the second pressing means 42, the other plate pressing portion 27 is pressed by the plate pressing pressure f using the clamping force F of the hydroform molding device 30 as a medium.
[0048]
As shown in FIG. 3A, the tip of the mold nozzle 50 is inserted into the injection port 28 of the overlapping plate material 20. The mold nozzle 50 is connected to a pressure supply device 51, and a medium whose pressure has been increased to a predetermined pressure is introduced from the pressure supply device 51 through the mold nozzle 50 into the overlapping plate material 20.
[0049]
5A is a cross-sectional view showing a preformed shape of the injection port 28, FIG. 5B is a front view showing the mold nozzle 50, and FIG. 5C shows the mold nozzle 50 with the injection port 28. FIG. It is sectional drawing which shows the state inserted in.
[0050]
As shown in FIG. 5A, the preformed shape of the injection port 28 has a circular shape in which the semicircular arc portions 61a and 61b formed on the metal plates 21 and 22 are abutted with each other.
[0051]
As shown in FIG. 5B, the mold nozzle 50 is formed with a central hole 52 for guiding the medium, a base 53 substantially equal to the outer diameter of the injection port 28, and a smaller diameter than the base 53. And an insertion portion 54. The insertion portion 54 includes a cylindrical portion 55 having an outer peripheral surface parallel to the axial direction, and a slightly tapered insertion guide portion 56 provided at the tip of the cylindrical portion 55. As shown in FIG. 5C, the outer diameter of the cylindrical portion 55 is larger than the inner diameter of the injection port 28. Therefore, when the mold nozzle 50 is inserted into the injection port 28, the injection port 28 is ironed by the upper and lower molds 31 and 32 and the mold nozzle 50, and is finally formed. After the main molding, the inner peripheral surface of the injection port 28 is in pressure contact with the outer peripheral surface of the cylindrical portion 55, and no gap is generated between the injection port 28 and the mold nozzle 50. For this reason, even if the medium is introduced from the mold nozzle 50 into the inlet 28, the medium does not leak out.
[0052]
6 (A) and 6 (B) are diagrams showing the shapes of the main parts of the recesses 33 and 34 provided in the upper and lower molds 31 and 32. FIG. 6 (A) shows the recesses 33 and the vicinity of the joining plate presser 25. 34 shows the shape of the recesses 33 and 34 in the vicinity of the other plate pressing portion 27. FIG.
[0053]
6A and 6B, the portions 33a and 34a that connect from the bonded plate holding portion 25 to the portion that forms the shape of the molded product are in the vicinity of the other plate holding portion 27. Compared to the shape, it has a gentle cross-sectional shape in the material inflow direction. With such a cross-sectional shape, the material is likely to flow from the bonded plate pressing portion 25 toward the portion constituting the shape of the molded product.
[0054]
Next, a forming procedure of the overlapping plate material 20 by the hydroform method will be described.
[0055]
First, as shown in FIG. 5A, semicircular arc portions 61a and 61b forming the injection port 28 are preformed on the two metal plates 21 and 22 by press working or the like. Further, as shown in FIG. 1B, the plate materials 23 and 24 are overlap-welded in accordance with the strength required for the molded product 10, and the two metal plates 21 and 22 are overlapped.
[0056]
Next, as shown in FIG. 2 (A), welding 26 is applied only to the plate pressing portion 25 in the range that allows the inflow of the material during the hydroforming molding among the edges of the overlapped metal plates 21 and 22. 21 and 22 are joined together to form a laminated plate material 20. The part to which the welding 26 is applied corresponds to the part 11 that exhibits a substantially linear shape in the shape of the molded product. The part not subjected to the welding 26 corresponds to the part 12 having a curvature in the shape of the molded product and the corner 13 of the molded product 10. In addition, the injection port 28 is located in the other plate holding part 27 which has not given the welding 26, and is preformed.
[0057]
Next, as shown in FIGS. 3A and 3B, the overlapping plate material 20 is put between the upper and lower molds 31 and 32 of the hydroform molding apparatus 30 and the molds are clamped. The other plate pressing portion 27 is pressed by the second pressing means 42 with a plate pressing pressure f using the clamping force F of the hydroform molding device 30 as a medium. On the other hand, the bonded plate presser 25 is pressed by the first presser 41 with a plate presser pressure controlled by the adjusting unit 60.
[0058]
Further, the mold nozzle 50 is inserted into the injection port 28, and the injection port 28 is ironed by the upper and lower molds 31 and 32 and the mold nozzle 50 to perform the main molding.
[0059]
Then, as shown in FIG. 3A, the medium that has been increased to a predetermined pressure is introduced from the pressure supply device 51 into the overlapping plate material 20 through the mold nozzle 50. At this time, since the inner peripheral surface of the injection port 28 thus formed is in pressure contact with the outer peripheral surface of the cylindrical portion 55 of the mold nozzle 50, the medium does not leak out.
[0060]
When the medium is supplied from the mold nozzle 50 and internal pressure is applied between the metal plates 21 and 22, the inflow of the material at the joining plate pressing portion 25 is allowed by the adjusting means 60 and the other plate pressing portion. Inflow of the material at 27 is restricted by the second presser means 42.
[0061]
As shown in FIG. 4, the joining plate presser 25 is pressed by the first presser 41 while allowing the inflow of the material, and therefore, from the contour before forming indicated by the two-dot chain line with the introduction of the medium. The material is deformed while being supplied until the contour shown by the solid line is obtained. Since the material inflow amount is controlled in the bonding plate presser 25, it is possible to perform combined molding of bulging and drawing with respect to the overlapping plate material 20 without causing cracks and the like. Moreover, since the two metal plates 21 and 22 are joined by the welding 26 in the joining plate pressing part 25, the malfunction which the two metal plates 21 and 22 shift | deviate as shown in FIG. 7 does not arise. Therefore, there is no difference in material inflow between the upper metal plates 21 and 22 and the lower metal plates 21 and 22, and a good molded product 10 can be obtained.
[0062]
On the other hand, the portion corresponding to the corner 13 of the molded article 10 is pressed by the second pressing means 42, so that no material flows even if the medium is introduced. Further, the portion 12 having a curvature in the shape of the molded product is also pressed by the second pressing means 42, so that no material flows even if the medium is introduced. For this reason, the portion 12 having a curvature is molded while the material is stretched, and the molded product 10 is not wrinkled. In this way, with the introduction of the medium, the overlapped plate material 20 is subjected to composite molding of overhang molding and draw molding.
[0063]
As shown in FIG. 6A, the cross-sectional shapes of the recesses 33 and 34 in the vicinity of the joining plate pressing portion 25 are set gently in the material inflow direction. For this reason, it becomes easy for a material to flow into the site | part which comprises a molded product shape from the joining plate press part 25 vicinity, and composite molding can be performed without producing a crack etc.
[0064]
Then, as shown in FIG. 3B, when the introduction of the medium is completed, the overlapping plate material 20 is formed into a shape that matches the inner surface shape of the concave portions 33 and 34, and the upper and lower molds 31 and 32 are opened to form the molded product 10. When is taken out, a series of hydroform molding is completed.
[0065]
Conventionally, when a part having different strengths is generally included in one product, a plurality of parts are press-molded using a metal plate having a thickness corresponding to the required strength, and these parts are By assembling in a later process, one product was created. This is because when the entire product is formed of a metal plate having a thickness corresponding to the required maximum strength, the product weight is increased.
[0066]
According to such a procedure, the process of making one product is extremely complicated, and the number of molds required for molding increases. In addition, a metal plate that is thicker than necessary may have to be used due to constraints such as the shape of the part, which increases the material cost. Furthermore, in the assembly process for assembling the press-formed parts, temporary welding must be performed while aligning the parts, and then the main welding must be performed, which naturally limits the time required for production. there were.
[0067]
On the other hand, in this embodiment, since the laminated plate material 20 composed of the metal plates 21 and 22 having different plate thicknesses according to the required strength is formed by composite molding, the molded product 10 is obtained. It can be remarkably simplified and can easily meet the required strength performance. Furthermore, the number of molds required for molding can be reduced, which can contribute to a reduction in manufacturing cost. Material costs can also be reduced.
[0068]
Moreover, since it is hydroform molding, the degree of freedom in selecting or setting the shape of the molded product is increased compared to press molding. Furthermore, there is less spring back than press molding, and the freezing property of the molded product shape is also improved.
[0069]
Further, paying attention to the range where the inflow of material is allowed and the range where the inflow of material is restricted, the metal plates 21 and 22 are joined to each other by welding 26 only on the plate holding portion within the range where the inflow of material is allowed. Since the laminated plate material 20 is used, it is possible to prevent problems in molding quality such as wrinkles and cracks and problems in welding quality such as peeling in the welded portion during hydroforming.
[0070]
Since a certain range in the overlapped plate member 20 is welded 26 in advance, the molded product 10 after hydroforming is already in a state where temporary welding has been completed, and can immediately shift to the main welding process. Therefore, the work of performing temporary welding while aligning the components required in the assembly process of press molding is not required, the alignment accuracy is improved, and the time required for production can be shortened.
[0071]
8A to 8D are perspective views showing modified examples of the overlapping plate member 20 and the metal plates 21 and 22 used therein.
[0072]
In the above-described embodiment, the case where the overlapping plate member 20 is configured by overlapping the two metal plates 21 and 22 so that the overlap-welded plate members 23 and 24 face the outside is illustrated (FIG. 1C). reference). The overlapping plate material 20 is not limited to this case, and as shown in FIG. 8A, the two metal plates 21 and 22 may be overlapped so that the plate materials 23 and 24 face the inside.
[0073]
Moreover, the form which provides the site | part from which plate | board thickness differs in the metal plates 21 and 22 is not restricted to the form which overlaps and welds the small board | plate materials 23 and 24. FIG. For example, as shown in FIGS. 8B and 8C, plate materials 71 and 72 having different plate thicknesses may be attached and welded 73. Further, as shown in FIG. 8 (D), it may be a form in which a sheet material 74 having a predetermined thickness is subjected to a method such as rolling to form a continuous differential thickness plate material.
[0074]
Moreover, although the case where each metal plate 21 and 22 has a site | part from which plate | board thickness differs was shown, this invention is applicable also when only one metal plate 21 or 22 has a site | part from which plate | board thickness differs. Needless to say, the present invention can be applied to a laminated plate made of a metal plate having a uniform thickness.
[0075]
In the embodiment described above, the weld 26 applied to the plate pressing portion is a peripheral portion located inward by a predetermined dimension from the outer periphery of the edge of the overlapped metal plates 21 and 22. However, the welding position is not limited to this part, and as shown in FIG. 2D, welding 26 may be applied to the outer periphery of the edge of the overlapped metal plates 21 and 22. If welding 26 is performed at this position, the waste portions of the plate holding portions 25 and 27 are reduced, and the material can be reduced.
[0076]
FIGS. 9A to 9G are cross-sectional views showing other examples of the preformed shape of the injection port 28.
[0077]
The preforming shape of the inlet 28 is a rectangular shape (FIG. 9 (A)) in which the semi-rectangular portions 62a and 62b formed on the metal plates 21 and 22 are abutted with each other, and the semi-elliptical portions 63a and 63b are mutual. Can be modified into any shape portions 64a and 64b (FIG. 9C) using a partial cross-sectional shape set in the molded product 10. Furthermore, the preforming shape of the injection port 28 includes a semicircular arc portion 61a (FIG. 9D), a semirectangular portion 62b (FIG. 9E), and a semielliptical portion 63a (FIG. 9) formed on one metal plate 21. (F)), it can be modified to an arbitrary shape portion 64b (FIG. 9G).
[0078]
In the above-described embodiment, the configuration has been shown in which the plate pressing pressure in the bonded plate pressing portion 25 is adjusted from both the upper and lower sides of the laminated plate material 20, but the plate pressing pressure in the bonded plate pressing portion 25 is adjusted on either the upper or lower side. May be.
[0079]
Further, although the embodiment has been shown in which the plate pressing pressure in the bonded plate pressing portion 25 is configured to be variable by the adjusting means 60, the plate pressing pressure in the other plate pressing portions 27 is adjusted by the adjusting means 60. In this way, it is possible to allow the inflow of the material at the joining plate pressing portion 25 and restrict the inflow of the material at the other plate pressing portion 27.
[0080]
Next, a mold structure suitable for hydroforming a laminated plate material welded only at a predetermined portion will be described in detail.
[0081]
FIG. 10 is an enlarged view of a main part showing an example of the overlapping plate material 20 in which the welding 26 is applied only to the plate pressing portion 25 in a range in which the inflow of the material is allowed.
[0082]
As shown in the drawing, the overlapping plate member 20 is welded only to the plate holding portion 25 in a range in which the inflow of the material is allowed during the hydroform molding among the edge portions of the overlapping metal plates 21 and 22. , 22 are joined together. When welding is performed by arc welding as in the illustrated example, it is difficult to control the protrusion of the welded portion 80 to be less than the thickness of the metal plate 21 in order to obtain the necessary penetration in the welding method. For this reason, the welded portion 80 is raised more than the thickness of the metal plate 21. The dimension of the raised portion 80a is about 0.5 times the plate thickness. Taking the case where the thickness of each of the metal plates 21 and 22 is 2.0 mm as an example, the rising dimension is about 1.0 mm, and the height dimension at the weld 80 is 2.0 mm × 2 sheets + 1.0 mm = It becomes about 5.0 mm.
[0083]
If hydroforming is performed with the welded portion 80 protruding from the metal plate 21, there may be a problem in welding quality such as peeling at the welded metal plates 21 and 22. For this reason, as shown by a two-dot chain line in FIG. In the above dimension example, it is necessary to cut the weld 80 so that the height of the weld 80 is 4.0 mm, which is substantially equal to the height of the overlapped plate member 20. If such a pre-processing for the welded portion 80 is required, the number of steps increases accordingly, resulting in an increase in manufacturing cost. From this point of view, the portion of the hydroform molding device that holds the bonded plate presser 25 is configured as follows.
[0084]
FIGS. 11 (A) and 11 (B) are enlarged views showing the vicinity of a portion that holds the welded plate presser portion of the hydroform molding apparatus. FIG. 11 (A) shows a state during hydroform molding. The figure (B) has shown the state just before hydroforming shaping | molding is complete | finished.
[0085]
As shown in the figure, the first pressing means 41 is provided with a gap portion 81 that does not contact the welded portion 80 in the joining plate pressing portion 25. In the illustrated example, the gap 81 is formed by forming a concave groove 82 in the upper plate pressing block 43. The welded portion 80 has a raised portion 80 a that protrudes from the metal plates 21 and 22. The gap dimension S between the raised portion 80a and the bottom surface of the groove 82 is a dimension that exceeds 1.0 mm.
[0086]
When hydroforming is performed while pressing the joining plate pressing portion 25 by the first pressing means 41 having the above-described configuration, the joining plate pressing portion 25 is deformed while supplying a material necessary for forming, as described above. However, from the time of molding shown in FIG. 11A to the end of molding shown in FIG. 11B, the welded portion 80 in the bonded plate pressing portion 25 is caused by the gap portion 81 provided in the plate pressing block 43. There is no contact with the first presser means 41. For this reason, it is possible to prevent welding quality defects such as peeling from occurring in the welded portion 80. Further, the hydroforming is performed in a state where the overlapped metal plates 21 and 22 are welded, that is, without processing the welded portion 80 to the same thickness as the thickness of the metal plates 21 and 22. Can do. Since the pre-processing for the welded portion 80 is not necessary, the number of processes is not increased, and the manufacturing cost is not increased.
[0087]
FIG. 12 is an enlarged view showing the vicinity of a portion for pressing the welded plate presser 25 in a hydroform molding apparatus according to another embodiment, and shows a state immediately before hydroform molding ends. Yes.
[0088]
As shown in the figure, the first pressing means 41 is provided with a blocking means 85 that prevents the welded portion 80 of the joining plate pressing portion 25 from entering the recesses 33 and 34. The blocking means 85 locks the raised portion 80 a of the welded portion 80 protruding from the metal plates 20 and 21. In the illustrated example, the gap 81 is formed by forming a concave groove 82 in the upper plate pressing block 43. Further, the blocking means 85 is formed by providing the right side wall 82r of the concave groove 82 in the drawing at a position where it abuts on the raised portion 80a of the welded portion 80 before the hydroforming is completed.
[0089]
When hydroforming is performed while pressing the joining plate pressing portion 25 by the first pressing means 41 having the above-described configuration, the joining plate pressing portion 25 is deformed while supplying a material necessary for forming, as described above. However, the raised portion 80a of the welded portion 80 abuts against the right side wall 82r of the recessed groove 82 in the drawing before the hydroforming is completed. For this reason, it can prevent that the welding part 80 penetrates into the recessed parts 33 and 34, and can prevent that the metal plates 21 and 22 in the welding part 80 are stripped up and down. As a result of preventing the welded portion 80 from entering the recesses 33 and 34, the size of the joining plate pressing portion 25 can be set to the minimum necessary size, and the material cost can be reduced.
[0090]
The blocking means 85 is not limited to the configuration described above, and can be modified as appropriate.
[0091]
For example, as shown in FIG. 13, the blocking means 85 may be formed by forming the cross-sectional shape of the concave groove 82 into a tapered shape. In such a configuration, when hydroforming is started, the joining plate pressing portion 25 is deformed while supplying materials necessary for forming, but before the hydroforming is finished, the raised portion 80a of the welded portion 80 is tapered. Contact the surface. As a result, the welded portion 80 is prevented from entering the recesses 33 and 34, and as described above, the metal plates 21 and 22 can be prevented from being peeled off in the vertical direction. Can be set to the minimum required size.
[0092]
Further, the blocking means 85 is not limited to a configuration in which the raised portion 80a of the welded portion 80 protruding from the metal plates 21 and 22 is directly locked, and is provided in the joint plate pressing portion 25 at an inner position than the welded portion 80. The structure which latches the bulging part 86 may be sufficient. That is, as shown in FIG. 14, the joining plate presser 25 is provided with a bulging portion 86 at an inner position than the welded portion 80, and the right wall 82r in the drawing of the concave groove 82 has finished hydroforming. It is provided at a position where it comes into contact with the bulging portion 86 before the operation. It is desirable that the bulging portion 86 has a rigidity increased by inserting a wire 87 between the metal plates 21 and 22. In such a configuration, when hydroforming is started, the joining plate presser 25 is deformed while supplying a material necessary for forming, but before the hydroforming is completed, the bulging portion 86 is formed in the concave groove 82. It contacts the right side wall 82r in the figure. As a result, the welded portion 80 is prevented from entering the recesses 33 and 34, and as described above, the metal plates 21 and 22 can be prevented from being peeled off in the vertical direction. Can be set to the minimum required size.
[0093]
The blocking means 85 for locking the bulging portion 86 is provided on both the upper and lower surfaces of the joining plate pressing portion 25 as shown in FIG. The form in which the bulging part 86 is locked by the right side wall 82r of the concave groove 82 in the drawing or the bulging parts 86 provided on the upper and lower surfaces of the joining plate pressing part 25 as shown in FIG. The shape can be modified to be locked by the tapered surface. In the form shown in FIG. 16 or FIG. 17, the concave groove 82 is also formed in the lower plate pressing block 43. By locking the bulging portions 86 provided on the upper and lower surfaces of the joining plate pressing portion 25, it is possible to more reliably prevent the welded portion 80 from entering the recesses 33 and 34.
[Brief description of the drawings]
FIG. 1 (A) is a perspective view showing an example of a molded product hydroformed by applying the present invention, and FIG. 1 (B) is a perspective view showing a laminated plate material before molding. FIG. (C) is a cross-sectional view taken along line 1-1 of FIG. (B).
FIG. 2 (A) is a plan view showing locations where welding is performed on the overlapping plate material, and FIG. 2 (B) is a plan view showing the overlapping plate material after hydroforming, FIG. 2 (C). These are sectional drawings in alignment with the 2-2 line of a figure (B), and the figure (D) is sectional drawing in the example which changed the welding position.
FIGS. 3A and 3B are cross-sectional views showing the main parts of a hydroform molding apparatus.
FIG. 4 is a view showing a laminated plate material being molded by a hydroform molding apparatus.
5A is a cross-sectional view showing a preformed shape of an injection port, FIG. 5B is a front view showing a mold nozzle, and FIG. 5C is a view showing a mold nozzle. It is sectional drawing which shows the state inserted in.
6 (A) and 6 (B) are diagrams showing the shape of the main part of the recess provided in the upper and lower molds, and FIG. 6 (A) shows the shape of the recess in the vicinity of the welded plate presser. FIG. 4B is a diagram showing the shape of a recess in the vicinity of another plate pressing portion that is not welded.
FIG. 7 is a cross-sectional view showing an example of a problem that may occur when the plate pressing portion in a range that allows the inflow of material at the time of hydroforming is not joined by welding.
FIGS. 8A to 8D are perspective views showing a modified example of a laminated plate material and a metal plate used therefor.
FIGS. 9A to 9G are cross-sectional views showing other examples of the preformed shape of the injection port.
FIG. 10 is an enlarged view of a main part showing an example of a laminated plate material that is welded only to a plate pressing portion in a range that allows inflow of material.
FIGS. 11 (A) and 11 (B) are views showing an example of a mold structure suitable for hydroforming an overlapped plate material welded only to a plate holding portion within a range that allows inflow of material. It is.
FIG. 12 is a view showing another example of a mold structure.
FIG. 13 is a diagram showing still another example of the mold structure.
FIG. 14 is a diagram showing still another example of the mold structure.
FIG. 15 is a view showing still another example of the mold structure.
FIG. 16 is a diagram showing still another example of the mold structure.
FIG. 17 is a view showing still another example of the mold structure.
[Explanation of symbols]
10 ... Molded product
11: Site that exhibits a substantially linear shape in the shape of the molded product
12: Part having curvature in the shape of the molded product
13 ... Corner of molded product
20 ... Laminated plate material
21, 22 ... Metal plate
25 ... Plate presser with welding
26 ... Welding
27 ... Other plate presser parts not welded
28 ... Inlet
30 ... Hydroform molding equipment
31, 32 ... type
33, 34 ... recess
41. First presser means
42. Second presser means
50 ... Mold nozzle
51 ... Pressure supply device
60. Adjustment means
80 ... welded part
80a ... Swelling part
81 ... Gap
82 ... concave groove
85. Blocking means
86 ... bulge
87 ... Wire

Claims (15)

A molded product that conforms to the shape of the recess by placing an overlapped metal plate including a corner and a side located between adjacent corners into a mold provided with a recess and applying internal pressure between the metal plates. In the hydroform molding method of the laminated plate material for molding
By deforming inward from the contour before molding, welding is applied to the side that forms the part that supplies the material necessary for molding, and inflow of material is restricted to prevent wrinkles from occurring in the molded product Put the overlapping plate material in which the metal plates are joined to each other without welding at the corners forming the part to be put in the mold,
Overhang forming and drawing are performed by applying an internal pressure between the metal plates while allowing inflow of material at the welded side and restricting inflow of material at the corner not welded. A method for hydroforming a laminated plate material, characterized by performing composite molding with molding. The method for hydroforming a laminated plate material according to claim 1, wherein an injection port for injecting a medium for applying an internal pressure between the metal plates is located at the corner and is preformed. 3. The molding according to claim 2 , wherein when the mold nozzle for supplying the medium is inserted into the injection port, the injection port is ironed by the mold and the mold nozzle and is finally formed. Hydroform forming method for laminated board materials. The method for hydroforming a laminated plate material according to claim 1, wherein a material inflow amount at the side subjected to the welding is controlled by adjusting a plate pressing pressure at the side or the corner. .   The method for hydroforming a laminated plate material according to claim 1, wherein at least one of the metal plates constituting the laminated plate material has portions having different plate thicknesses. In a hydroforming apparatus for a laminated plate material for hydroforming a molded product from a superimposed metal plate including a corner and a side located between adjacent corners,
By deforming inward from the contour before molding, welding is applied to the side that forms the part that supplies the material necessary for molding, and inflow of material is restricted to prevent wrinkles from occurring in the molded product The upper and lower molds that can move relative to and away from each other , and put the overlapping plate material that joins the metal plates together without welding to the corners forming the part ,
A recess provided in the upper and lower molds;
First pressing means for pressing the side subjected to the welding;
A second presser means provided independently of the first presser means for pressing the corners not welded;
A mold nozzle for supplying a medium for applying an internal pressure between the metal plates;
And an adjusting means capable of changing the plate pressing pressure at the side or the corner ,
The medium is supplied from the mold nozzle between the metal plates while allowing the inflow of the material at the side where the welding is performed and restricting the inflow of the material at the corner where the welding is not performed. A hydroform molding apparatus for a laminated plate material, which applies an internal pressure to form a molded product that conforms to the shape of the recess by performing composite molding of overhang molding and drawing. The overlapping plate material has a preformed injection port for injecting the medium,
The superposition according to claim 6 , wherein, when the mold nozzle is inserted into the injection port, the injection port is ironed by the upper and lower molds and the mold nozzle and finally formed. Hydroform molding equipment for plate materials. The at least one metal plate which comprises the said laminated board material has a site | part from which board thickness differs, The hydroform shaping | molding apparatus of the laminated board material of Claim 6 characterized by the above-mentioned. In a laminated metal plate that includes a corner and a side located between adjacent corners, and is hydroformed into a molded product that matches the shape of the recess provided in the mold ,
By deforming inward from the contour before molding, welding is applied to the side that forms the part that supplies the material necessary for molding, and inflow of material is restricted to prevent wrinkles from occurring in the molded product A laminated plate material , wherein the metal plates are joined to each other without welding at the corners forming the portions to be formed . The overlapping plate material according to claim 9 , wherein at least one of the metal plates constituting the overlapping plate material has portions having different plate thicknesses. The hydroforming method according to claim 1, wherein the side subjected to the welding is pressed by a mold that does not contact a welded portion in the side . The first pressing means, hydroforming molding apparatus according to claim 6, characterized in that a gap portion which does not contact the welded portion in the-edge subjected to the welding are provided. The first pressing means, hydroforming molding apparatus according to claim 6, characterized in that blocking means welds in the-edge subjected to the welding is prevented from entering into the recess is provided. The hydroforming apparatus according to claim 13 , wherein the blocking means engages a raised portion of the welded portion protruding from the metal plate. It said blocking means, hydroforming molding apparatus according to claim 13, characterized in that to lock the bulge provided on the even inner position than the welded portion on the side subjected to the welding.

Images