JP2017104901A - Method for manufacturing metallic press-molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and inexpensively obtain a plurality of metallic molded bodies that are free from cracking, warpage, scratches and molding die marks and have the same shape and the same size using a resin molding die three-dimensionally shaped by a three-dimensional printer without structurally damaging the resin molding die, and to prevent magnetization of the metallic molded body, industrially impart a crimp pattern onto the appearance surface of the molded body, and improve appearance of the molded body.SOLUTION: A metallic press-molded body is a resin molding die of which an upper die and a lower die are three-dimensionally shaped using a three-dimensional printer, a material to be processed is a metal plate having a thickness in a range of 0.1-6.0 mm, and thicknesses of the deepest portions each of the upper die and the lower die is at least 5 mm. Preferably, the resin molding die is shaped by an optical laminate shaping method, lamination directions of each of photocurable compositions of the upper die and the lower die are perpendicular to a vertical motion direction of the upper die, a bottom dead point position of a slide is corrected to 0.5-2.0 mm below a reference set position, and the material to be processed is press-molded.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of manufacturing a metal press-molded body using a resin mold formed by a three-dimensional printing apparatus (what is called a three-dimensional printer, a three-dimensional printer, or a three-dimensional modeling machine).

  In the press molding method, generally, a work piece of a flat metal sheet is sandwiched between molds, and the work piece is pressed against the mold surface by vertical movement with a strong force to form the same final shape as the mold. It is a way of creating. In press molding, the desired final shape is created by plastic deformation of the workpiece, and no tools such as cutting are used. For this reason, press work is suitable for mass production because it has higher productivity than other machining processes. The mold generally requires durability such as wear resistance, impact resistance, and chipping resistance, and tool steels such as cemented carbide, cast iron, cast steel, and forged steel are used (for example, Patent Documents 1 and 2). reference.).

JP 2005-152961 A (paragraph [0002], paragraph [0004]) JP 2004-306119 A (paragraph [0023])

  However, when manufacturing a metal press-molded body having a complicated shape with a mold using conventional tool steel, due to the material of the mold, the material of the workpiece, the thickness of the workpiece, etc. In some cases, the molded product does not have a desired shape and dimensions, or the molded product is inferior in press formability such as cracks and scratches. In order to solve this problem, for example, it was necessary to perform stainless steel welding on the surface of the mold, or to perform machining, electrolytic processing, wire electric discharge machining, or the like on the surface of the mold. Especially when drawing or bending with conventional molds, oil is used during pressing or chemical vapor deposition (CVD) treatment or physical vapor deposition (PVD) on the mold surface to prevent moldability and scratches. Coating processing such as processing was performed. For these reasons, in general, the press molding method requires a large number of production days and production costs to produce a metal mold, and this press molding is performed before the mass production. Prototype production by the law was not possible from the viewpoint of production days and production costs. Also, because the die height cannot be lowered beyond the thickness of the tool steel and the pressure beyond the thickness of the molded body cannot be applied, the molded body may be warped, and the press taken out from the mold after press molding. The correction process for eliminating the curvature of a molded object was required.

  In addition, if pressing continues with a mold using conventional tool steel and the number of pressed products exceeds a certain number, the mold becomes magnetized, and if the workpiece is a magnetic material, the press molded body becomes magnetized. was there. When a press-molded body is used for a casing or equipment of an electronic product that deteriorates performance when magnetized, it is troublesome because it is necessary to demagnetize the pre-magnetized press-molded body in advance.

  Furthermore, in general, to improve the decorativeness and design of the appearance of the press-molded body (hereinafter referred to as “appearance”) and to form a wrinkle pattern on the exterior surface of the press-molded body in order to prevent slippage. However, when the press-molded body is made of metal, it is extremely difficult to form a transfer texture on the surface of the upper or lower mold of the tool steel used by machining with a cutting machine such as machining. For this reason, it has been expected to provide a texture pattern on the surface of a metal press-molded body industrially.

  The first object of the present invention is to use a resin molding die that is three-dimensionally shaped using a three-dimensional printing device, and to easily form a metal press-molded body free from cracks, warpage, scratches, and molding die traces. Another object is to provide a method for manufacturing at low cost. The second object of the present invention is to provide a method for producing a metal press-molded body having a plurality of shapes having the same shape and the same size without structurally damaging the resin mold even if the molded body is repeatedly produced. There is. The third object of the present invention is to provide a method for producing a metal press-formed body that does not need to be demagnetized even when the metal press-formed body is used as a pressed product for an electronic component. is there. The fourth object of the present invention is to provide a method for industrially producing a metal press-molded body that gives a texture pattern on the exterior surface of the molded body to improve the appearance of the molded body.

  The present inventors made a resin mold having a predetermined thickness using a three-dimensional printing apparatus instead of a metal mold, which is a metal mold, and set the thickness of the workpiece to a predetermined thickness. If it is selected and repeated press forming, it is excellent in formability, and a metal press-formed body can be manufactured according to a predetermined dimension, and metal press forming that does not become magnetized even if a large amount of press-processed products are manufactured. The present invention has been achieved by paying attention to the fact that a body can be produced, and that a texture pattern can be imparted to the external surface of a metal molded body.

  According to a first aspect of the present invention, a work material is disposed between an upper mold attached to a vertically moving slide of a press device and a lower mold fixed to a bolster, and the upper mold is pressed against the lower mold. In the method of manufacturing a press-molded body by press-molding the workpiece, the upper mold and the lower mold are both resin molds that are three-dimensionally modeled using a three-dimensional printing device, A metal plate having a thickness of a workpiece in the range of 0.1 to 6.0 mm, wherein the upper mold and the lower mold at the deepest part of each of the upper mold and the lower mold made of the resin mold Each thickness of the mold is at least 5 mm.

  A second aspect of the present invention is an invention based on the first aspect, wherein the resin mold is three-dimensionally formed by laminating a photocurable composition by an optical lamination modeling method, and the resin The lamination direction of each photocurable composition of the upper mold and the lower mold made of a mold is perpendicular to the vertical movement direction of the upper mold.

  A third aspect of the present invention is an invention based on the first or second aspect, wherein the bottom dead center position of the slide that moves up and down between a top dead center position and a bottom dead center position is a reference. The workpiece is press-molded with a correction of 0.5 to 2.0 mm below the set position.

  A fourth aspect of the present invention is an invention based on any one of the first to third aspects, and is one or both of the upper mold and the lower mold of the resin mold. A transfer texture is formed on the mold surface using a three-dimensional printing machine.

  A fifth aspect of the present invention is a resin mold used in the method for producing a metal press-molded body according to the fourth aspect.

  In the method for producing a metal press-molded body according to the first aspect of the present invention, since a press-molded body is produced using a resin mold produced by a three-dimensional printing machine, conventional machining, electrolytic processing, wire Compared to an expensive mold manufactured by electric discharge machining, a molded body can be manufactured easily and inexpensively. In particular, in a three-dimensional printing machine, even if the required product shape is complicated and fine, the shape of the resin mold can be created by matching the shape faithfully and precisely. As a result, when the thickness of the workpiece is a metal plate in the range of 0.1 to 6.0 mm and the thickness at each deepest part of the upper mold and the lower mold is at least 5 mm, the resin mold is Since it is elastically deformed during pressing and returns to its original shape after depressurization, it can be repeatedly molded without damaging the resin mold due to its structure. The molded body can be produced without cracks, warpage, scratches and mold traces. Thereby, it is possible to easily manufacture a press-molded body for a prototype or a mass-produced product such as a toy, a daily miscellaneous goods, an automobile part, and an electrical part. Even when a large amount of a press-formed product is manufactured using a resin mold, the mold itself is made of resin and does not become magnetized, so that it can be manufactured without magnetizing the metal press-molded body. This eliminates the need for demagnetization even when a metal press-molded body is used for a housing or equipment for an electronic component.

  In the method for producing a metal press-molded body according to the second aspect of the present invention, when the upper die is pressed, the upper die and the lower die are stretched in the horizontal direction, which is the stacking direction, due to resin elasticity, and the upper die and the lower die. The material to be processed is plastically deformed without gaps in the cavity formed by the above. In addition, when pressed, the contact surface of the molded body is harder than ordinary resin due to lamination hardening, so slipping more than when finished with conventional tool steel or more slipping when using oil, work Better plastic deformation of the material. As a result, even if the required shape of the product is complicated and fine, the press-molded body can be manufactured by matching the shape more faithfully and more precisely.

  In the method for producing a metal press-molded body according to the third aspect of the present invention, the upper die is lowered by correcting the bottom dead center position of the slide 0.5 to 2.0 mm below the reference set position. Can be plastically deformed without gaps in the cavity formed by the upper die and the lower die, and even if the required product shape is complex and fine, It can be manufactured with more faithful and more precise matching due to its shape, and the warp after press molding is eliminated without causing warp in the metal press-molded body taken out from the resin mold after press molding. There is no need for corrective processing.

  In the method for producing a metal press-molded body according to the fourth aspect of the present invention, the transfer texture is formed on the surface of one or both of the upper mold and the lower mold by a three-dimensional printing apparatus. It is possible to industrially produce a metal press-molded body in which a texture pattern is imparted to the outer surface of the mold to improve the appearance of the molded body, or the molded body is slip-proofed.

  According to the resin mold of the fifth aspect of the present invention, a texture pattern can be imparted to the surface of a metal press-molded body industrially and easily.

It is a block diagram of the apparatus which manufactures the metal press-molded body which concerns on embodiment of this invention. FIG. 1A shows a state where the slide and the upper mold are stationary at the top dead center position, and FIG. 1B shows a state where the slide and the upper mold reach the bottom dead center position. It is a schematic sectional drawing which shows the optical lamination molding method for manufacturing the lower mold | type which concerns on embodiment of this invention. FIG. 2A shows a state in which a first cured thin layer having a predetermined shape is formed, and FIG. 2B shows a state in which the table is moved slightly downward to form a second cured thin layer. FIG. 2C shows a state in which a lower mold, which is an optically shaped object having a predetermined three-dimensional shape, is formed. It is a figure of the resin-made shaping | molding die made with the optical lamination molding method which concerns on another embodiment of this invention. 3 (a) is a plan view of the lower mold, FIG. 3 (b) is a plan view of the upper mold, and FIG. 3 (c) is A of FIG. 3 (a) of the upper mold and the lower mold during pressing. FIG.

  Next, modes for carrying out the present invention will be described with reference to the drawings.

  First, an apparatus (hereinafter referred to as a press apparatus) for producing a metal press-formed body according to an embodiment of the present invention will be described. As shown in FIG. 1, a press device 10 according to the present embodiment includes a flywheel 11 that stores rotational energy from a drive motor, a crankshaft 12, and transmits and blocks the rotational force of the flywheel 11 to the crankshaft 12. And a connecting rod 14 that changes the rotational motion of the crankshaft 12 to a linear motion, and a slide 16 that linearly moves between a top dead center position and a bottom dead center position in accordance with the linear motion of the connecting rod 14. . The crankshaft 12 has a rotating shaft 12a and an eccentric shaft 12b that is connected to the rotating shaft 12a and eccentric with respect to the rotating shaft 12a. The connecting rod 14 connects the eccentric shaft 12 b to the slide 16 through a joint 15. The connecting rod 14 is rotatably connected to the eccentric shaft 12b.

  The press device 10 in this embodiment further includes a frame 17 that is provided on both side surfaces of the slide 16 and regulates the slide 16 so as to linearly move in the vertical direction, an upper mold 18 attached to the lower surface of the slide 16, A lower mold 19 disposed below the mold 18 and a bolster 20 to which the lower mold 19 is fixed are provided.

  The upper mold 18 and the lower mold 19 of the present embodiment are both resin molds and are three-dimensionally formed using a three-dimensional printing apparatus. In this embodiment, the resin mold 13 that is an optical modeling object is manufactured by an optical three-dimensional modeling method represented by an optical layered modeling method. 2A to 2C show a process of modeling the lower mold 19 by the optical layered modeling method. The three-dimensional data of the shaped object corresponding to the lower mold 19 is acquired in advance, and the data is cut into circles at equal intervals and stored as slice data. As shown in FIG. 2 (a), in the vertical direction so that the upper surface is located at a point slightly below the liquid surface 23 in the container 22 liquid tank containing the liquid photocurable composition 21. A movable table 24 is arranged. The liquid photocurable composition contains a radically polymerizable compound such as a (meth) acrylic monomer, a polymerizable monomer containing a cationically polymerizable compound such as an epoxy compound, a photopolymerization initiator, and the like. After placing the table 24, the thin layer of the liquid photocurable composition 24 on the table 24 is scanned with the ultraviolet laser beam 27 from the ultraviolet laser device 26 in a predetermined pattern based on the stored data, A first cured thin layer 19a having a predetermined shape is formed. Next, as shown in FIG. 2B, the thin layer of the liquid photocurable composition 24 is formed on the first cured thin layer 19a by moving the position of the table 24 downward by a small distance. After the formation, the ultraviolet laser beam 27 is scanned on the thin layer in a predetermined pattern based on the stored data to form the second cured thin layer 19b having a predetermined shape. Thereafter, the same operation is repeated, and finally, as shown in FIG. 2 (c), stereolithography having a predetermined three-dimensional shape that is an aggregate of a plurality of cured thin layers 19a, 19b,. The lower mold 19 is obtained. Although not shown, the upper die 18 is also produced by the same method as the lower die 19.

  As is clear from FIG. 2 (c), in this embodiment, the photocurable composition of each of the upper mold and the lower mold is horizontally perpendicular to the vertical movement direction of the upper mold 18 as shown in FIG. 1 (a). Laminated so as to be in the direction. In addition, although not shown in figure, the lamination direction of each photocurable composition may be made into the perpendicular | vertical direction same as the up-and-down moving direction of both the upper mold | type and a lower mold | type. As in this embodiment shown in FIG. 1 (a), the upper mold 18 and the lower mold 19 both have their photocurable compositions laminated in the horizontal direction perpendicular to the vertical movement direction of the upper mold. When the die is pressed, the upper die and the lower die are stretched in the horizontal direction, which is the stacking direction, due to resin elasticity, and the workpiece can be plastically deformed without a gap in the cavity formed by the upper die and the lower die. In other words, the contact surface of the molded body becomes harder than ordinary resin due to lamination hardening at the time of pressing, so slipping occurs more than when the conventional tool steel is polished and finished, or more slipping when oil is used. Better plastic deformation of the workpiece. As a result, even if the shape of the required product is complicated and fine, a metal press-formed body can be manufactured by matching the shape more faithfully and more precisely.

As shown in the enlarged view surrounded by the alternate long and short dash line in FIG. 1A, the thicknesses d ₁ and d ₂ of the upper mold and the lower mold in the deepest portions of the upper mold 18 and the lower mold 19 of this embodiment are Although it varies depending on the size of the upper mold, the lower mold, the number of irregularities on the mold surface, the type of the photocurable composition, the hardness of the resin after photocuring, the elasticity, etc., at least 5 mm is necessary. When the thickness is less than 5 mm, the upper and lower molds made of a resin mold may be damaged during pressing, and in this case, a desired metal press-molded body cannot be manufactured. The thicknesses d ₁ and d ₂ of the upper mold and the lower mold at the preferred deepest part are 10 mm or more and 500 mm or less. The reason why the upper limit is set to 500 mm or less is that the durability of the resin mold does not change even if the thickness is increased beyond this, and waste of the photocurable composition material is prevented.

  The metal press-formed body of the present invention is not limited to the mechanical press device that transmits the rotational motion of the motor to the crankshaft and changes it into a linear motion, but is formed by a hydraulic press device that operates the slide by applying hydraulic pressure. May be. The mechanical press device is not limited to the crank press described above, and includes various press devices such as a crankless press, a knuckle press, a screw press, a shaving press, a wedge press, a cam press, a link press, and a servo press. In addition, the upper mold and the lower mold made of the resin mold that is the molded article of the present invention are not limited to the above-described optical layered molding method, but those of an inkjet ultraviolet curing method using an acrylic photo-curing resin by a three-dimensional printer. Alternatively, it may be manufactured by a heat melting lamination method using ABS resin (acrylonitrile / butadiene / styrene copolymer synthetic resin) or a powder fixing method using powder. FIG. 3 shows an upper mold and a lower mold of another embodiment produced by an ultraviolet curable resin using a three-dimensional printer.

  In addition, the predetermined shape described above corresponds to the surface of the mold so that a transfer texture is formed on the surface of one or both of the upper mold and the lower mold of the resin mold by a three-dimensional printing machine. A cured thin layer can also be formed. Here, “texture” refers to a pattern with fine irregularities such as leather, pear texture, wood grain, rock grain, sand grain, fabric, and geometry.

As shown in the enlarged view surrounded by the alternate long and short dash line in FIG. 1A, the workpiece W of the present embodiment is a metal plate having a thickness t ₁ within a range of 0.1 to 6.0 mm. Examples of the metal plate include an aluminum plate, a steel plate, a stainless steel plate, and a copper plate. This thickness is determined according to the metal material, the size of the molded body, and the required degree of unevenness of the molded body. If the workpiece W is less than 0.1 mm, it does not conform to the accuracy compensated by the three-dimensional printing apparatus and cannot be molded according to the dimensions. On the other hand, if it exceeds 6.0 mm, there is a problem such as cracking in the resin mold. A preferable thickness of the workpiece W is 0.5 to 4.0 mm.

  Next, a method for producing a metal press-molded body using the press device 10 will be described. The workpiece W is sandwiched between the upper mold 18 and the lower mold 19 in a state where the slide 16 and the upper mold 18 are stationary at the top dead center position shown in FIG. Next, the clutch 13 is connected to the flywheel 11, and the rotational force of the flywheel is transmitted to the rotary shaft 12a. As a result, the rotation shaft 12a and the eccentric shaft 12b of the crankshaft 12 rotate, and the slide 16 and the upper mold 18 linearly move in the vertical direction accordingly. When the slide 16 and the upper mold 18 reach the bottom dead center reference position shown in FIG. 1B, the workpiece W is pressed against the surface of the lower mold 19 by the upper mold 18, and the workpiece W is moved to the upper mold 18. And the lower mold 19 are pressed to obtain a metal press-formed body P. In this embodiment, when the upper die 18 is pressed, the upper die 18 and the lower die 19 are stretched in the horizontal direction, which is the stacking direction, due to resin elasticity, and are processed into a cavity formed by the upper die 18 and the lower die 19. The material W is plastically deformed without gaps. As a result, even if the required shape of the product is complicated and fine, the metal press-formed product P can be manufactured by matching the shape more faithfully and more precisely.

  Here, it is preferable that the bottom dead center position of the slide 16 is corrected 0.5 to 2.0 mm below the reference set position according to the degree of elasticity of the resin mold. By doing so, when the slide 16 reaches the bottom dead center position, the upper die 18 is pushed into the lower die 19, and the workpiece W is further placed in the cavity formed by the upper die 18 and the lower die 19. It can be reliably plastically deformed without gaps, and even if the required product shape is complex and fine, the metal press-molded product P can be manufactured by matching the shape more faithfully and more precisely. In addition, the metal press-molded body P taken out from the resin mold after press molding does not warp, and correction processing for eliminating the warp after press molding is not required.

  After the press molding shown in FIG. 1B, the slide 16 is raised, and the metal press-molded body P is taken out between the upper mold 18 and the lower mold 19. Even if the above operation is repeated, the upper mold 18 and the lower mold 19 made of the resin mold are only subjected to stress within a range in which they can be elastically deformed, and thus are not structurally damaged. As a result, by repeating this operation, a plurality of metal press-molded bodies having the same shape and the same size can be manufactured.

  In addition, if a three-dimensional printing machine is used for press molding with an upper mold and a lower mold in which fine transfer textures are formed on the surface of either or both of the upper mold and the lower mold of the resin mold, this resin An embossed pattern can be imparted to the surface of a metal press-molded body industrially and simply using a mold. Thereby, the appearance of the appearance of the metal press-formed body can be improved, or a function of preventing slippage can be imparted to the metal press-formed body.

  Next, examples of the present invention will be described in detail together with comparative examples.

<Examples 1-4>
An upper mold and a lower mold made of an ultraviolet curable resin each prepared by a three-dimensional printer, which is a three-dimensional printing apparatus, were prepared. The thickness of the deepest part of the upper mold was 29 mm, and the thickness of the deepest part of the lower mold was 11 mm. The upper die was attached to the lower surface of the slide of the press device, and the lower die was fixed to the bolster of the breath device facing the upper die. Work materials having a thickness of 0.5 mm of four kinds of materials shown in Table 1 were sandwiched between these upper molds and lower molds and press-molded. The bottom dead center position of the slide at this time was corrected downward from the reference set position by the value shown in Table 4.

<Examples 5 to 8>
Except for using an upper mold having a deepest part thickness of 19 mm and a lower mold having a deepest part thickness of 21 mm, four types of materials shown in Table 1 having a thickness of 0.5 mm were used in the same manner as in Examples 1 to 4. The processed material was press-molded with these upper mold and lower mold using the same press apparatus. The bottom dead center position of the slide at this time was corrected downward from the reference set position by the value shown in Table 4.

<Examples 9 to 12>
Each of the four types of materials shown in Table 1 was prepared using an upper mold having a deepest part thickness of 5 mm and a lower mold having a deepest part thickness of 15 mm. A workpiece having a thickness of 0.1 mm was press-molded with these upper mold and lower mold using the same press apparatus. At this time, the bottom dead center position of the slide remained at the reference set position and was not corrected downward.

<Examples 13 to 21>
The materials and thicknesses shown in Table 1 were prepared using the upper mold having the deepest part thickness of 110 mm and the deepest part having the thickness of 50 mm, respectively, which were respectively produced by a three-dimensional printer as in Examples 1 to 4. The workpiece to be processed was press-molded with these upper mold and lower mold using the same press apparatus. The bottom dead center position of the slide at this time was corrected downward from the reference set position by the value shown in Table 4.

<Comparative Example 1>
Using an upper mold having a deepest part thickness of 29 mm and a lower mold having a deepest part thickness of 11 mm, each produced by a three-dimensional printer in the same manner as in Examples 1 to 4, an aluminum thickness of 0.08 mm was used. The workpiece was press-molded with these upper and lower molds using the same press machine. At this time, the bottom dead center position of the slide remained at the reference set position and was not corrected downward.

<Comparative example 2>
It was press-molded in the same manner as in Comparative Example 1 except that an aluminum workpiece having a thickness of 6.1 mm was used. At this time, the bottom dead center position of the slide remained at the reference set position and was not corrected downward.

<Comparative Example 3>
Using an upper mold having a deepest part thickness of 4 mm and a lower mold having a deepest part thickness of 50 mm, each produced by a three-dimensional printer in the same manner as in Examples 1 to 4, an aluminum thickness of 0.1 mm The workpiece was press-molded with these upper and lower molds using the same press machine. The bottom dead center position of the slide at this time was corrected 0.5 mm below the reference set position.

<Comparison result 1 (Press evaluation and presence or absence of breakage of mold)>
About the molded object press-molded in Examples 1-21 and Comparative Examples 1-3, the presence or absence of cracks, scratches, mold traces, and warpage was visually determined. Further, whether or not the molded body was press-molded to a predetermined size was determined by a caliper, height gauge, or micrometer. Furthermore, the presence or absence of damage of the upper mold and the lower mold was determined visually. These results are shown in Table 2.

  As is clear from Tables 1 and 2, in Comparative Example 1, the thickness of the workpiece is too thin at 0.08 mm, so that the metal press-molded body cannot be molded according to the dimensions. Traces remained. In Comparative Example 2, the workpiece was too thick at 6.1 mm, so that the lower mold was damaged. Furthermore, in the comparative example 3, since the deepest part of the upper mold was too small as 4 mm, the upper mold was damaged. On the other hand, in Examples 1-21, although the upper mold | type and lower mold | die which consist of the ultraviolet curable resin each produced with the three-dimensional printer were used, the thickness of a workpiece is 0.1-6. If it is within the range of 0 mm and the thickness at the deepest part of each of the upper die and the lower die is at least 5 mm, the press-molded molded article has no cracks, scratches, mold traces and warpage, and The molded body was press-molded according to predetermined dimensions. Further, no damage was observed in the upper mold and the lower mold.

<Comparison result 2 (mass productivity evaluation)>
The same upper die and lower die as in Example 1 were attached to the same press device as in Example 1, and 500 press-molded aluminum materials as in Example 1 were repeatedly press-molded using this press device. . After 500 times of press molding, the upper mold and the lower mold were visually inspected for cracks, scratches, chips, and the like. In addition, the presence or absence of cracks, scratches, mold traces, and warpage of 500 aluminum press-formed bodies was visually determined. Moreover, it determined with the caliper height gauge micrometer by which the molded object was press-molded according to a predetermined dimension. As a result, the upper die and the lower die after 500 times of press molding had the same appearance as after the first press molding, and there were no cracks, scratches or chips. This is because the 500th aluminum press-molded body was the same shape and size as the first pressed body, and there were no cracks, scratches, or traces as with the upper and lower molds. Proven.

<Comparison result 3 (magnetism evaluation)>
The same upper die and lower die as in Example 1 were attached to the same press device as in Example 1, and 100 steel workpieces were repeatedly press-molded using this press device. After 100 times of press forming, all 100 workpieces were brought into contact with the iron plate. As a result, all the workpieces were not attracted to the iron plate, and all the workpieces were not magnetized. On the other hand, the upper die and the lower die of the die steel SKD11 having the same shape and size as in Example 1 are attached to the same pressing device as in Example 1, and 100 pieces of the same steel as described above are used by using this pressing device. The workpiece was repeatedly press molded. After press forming 76 times, when all 76 workpieces were brought into contact with the iron plate, the workpiece with a press count of less than 50 was not adsorbed to the iron plate, but the workpiece more than 50 times. Adsorbed to the iron plate and the workpiece was magnetized.

10 Equipment for producing metal press-formed bodies (press equipment)
11 Flywheel 12 Clutch 13 Crankshaft 14 Connecting rod 15 Joint 16 Slide 17 Frame 18 Upper mold 19 Lower mold 20 Bolster

  The method for producing a metal press-molded body according to the present invention includes a molded body for a prototype such as a toy, a daily miscellaneous goods, an automobile part, and an electric part, or a press-processed article for an electronic part in which magnetism adversely affects performance. Alternatively, it is used to easily and inexpensively produce a molded body on which a texture pattern is formed.

Claims (5)

A work material is arranged between an upper mold attached to a slide that moves up and down of a press device and a lower mold fixed to a bolster, and the upper mold is pressed against the lower mold to press the work material. In a method for producing a press-formed body by:
Both the upper mold and the lower mold are three-dimensionally molded resin molds using a three-dimensional printing device,
The workpiece is a metal plate having a thickness in the range of 0.1 to 6.0 mm,
The thickness of each of the upper mold and the lower mold in the deepest part of each of the upper mold and the lower mold made of the resin mold is at least 5 mm. A method for producing a metal press-molded body .   The resin mold is three-dimensionally modeled by laminating a photocurable composition by an optical layered modeling method, and the upper mold and the lower mold of the resin mold are stacked. The method for producing a metal press-formed body according to claim 1, wherein the direction is perpendicular to the vertical movement direction of the upper die.   The bottom dead center position of the slide that moves up and down between the top dead center position and the bottom dead center position is corrected to 0.5 to 2.0 mm below the reference set position, and the workpiece is press-molded. The manufacturing method of the metal press-molding body of Claim 1 or 2.   The metal according to any one of claims 1 to 3, wherein a transfer texture is formed on a surface of one or both of the upper mold and the lower mold of the resin mold using a three-dimensional printing device. A method for producing a press-molded body.   A resin mold used in the method for producing a metal press-molded body according to claim 4.

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