JP2015077621A - Press work method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press work method which can suppress occurrence of distortion during a press molding process, and properly remove the distortion occurred in the press molding process.SOLUTION: A press work method using a press device 10 comprising a die 11, a punch 12, a die holder 13, a blank holder 14 and a strain correction punch 15 performs a convexoconcave molding step following a molding step. In the molding step, a plurality of striped convexoconcave shapes are molded at a central part Z1 while allowing a material to flow from a peripheral edge part Z2 of a thin metal plate Z held between the holder 13 and the holder 14 to the central part Z1 of the thin metal plate Z molded by a molding part 11a of the die 11 and a molding part 12a of the punch 12. In the convexoconcave molding step, a convexity (concavity) Z4 is molded at an arbitrary portion of the peripheral edge part Z2 by the strain correction punch 15 while the peripheral edge part Z2 is fixed between the holder 13 and the holder 14.

Description

  The present invention relates to a press processing method for manufacturing a press-processed product by forming a predetermined shape on a thin blank.

  In general, a press-processed product often has distortion (distortion) after molding. In particular, when a thin blank (thin metal plate) is used as a material for a press-processed product, distortion tends to remain, and it is extremely important to remove the distortion in order to ensure the function or the merchantability. With respect to this point, conventionally, as shown in, for example, Patent Document 1 below, a strain removal method and a press apparatus for a press-processed product for removing the strain of a press-processed product made of a thin metal plate are known.

  This conventional method for removing distortion of a press-worked product and the press device are formed by press-molding the peripheral portion of the thin metal plate with the die of the press device and the blank holder insert, and the center of the press-worked product that has been press-molded. It is made to move in the pressing direction while being partially sandwiched between the upper die and the lower die. In this way, by moving the press-processed product, the peripheral portion surrounding the center portion of the press-processed product is relatively stretched in the direction away from the center portion, and the press-processed product is plastically deformed. It is designed to remove distortion. As a result, it is possible to easily remove the distortion of the press-processed product made of a thin metal plate by simply extending the press-processed product while maintaining the shape of the press-processed product.

Japanese Patent Laying-Open No. 2003-230913 (Japanese Patent No. 4166019)

  By the way, in the above conventional pressed product distortion removing method and press apparatus, the peripheral portion of the pressed product is relatively stretched in the direction away from the central portion, in other words, the entire peripheral portion is uniformly stretched to be plastic. Deform and remove distortion. In this case, the entire press-processed product can be successfully removed from the distortion caused by the press process, but unnecessary processing is performed even on the non-distorted part, resulting in new distortion. there's a possibility that. Therefore, when the occurrence of distortion can be predicted by the press working mode, it is desirable that the distortion is preferentially removed at the area where the occurrence of distortion is predicted.

  Moreover, in the above conventional press-removed product distortion removing method and press apparatus, the peripheral portion of the thin metal plate, which is a thin blank, is fixed by a die and a blank holder insert, that is, from the peripheral portion toward the central portion. In a state where the material flow is prohibited, a large number of streaks are formed at the center by the upper mold and the lower mold. In this case, since the material flow is prohibited, a large number of streaky irregularities (grooves) formed at the center of the thin metal plate are formed by so-called overhanging. For this reason, there is a tendency that distortion generated when a large number of streaky irregularities are formed tends to increase. Therefore, it is also desired to suppress the occurrence of distortion itself.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a press working method capable of suppressing the occurrence of distortion during press molding and appropriately removing the generated distortion.

  In order to achieve the above object, a feature of the present invention is to use a press device having a female die, a male die, a die holder located on the outer periphery of the female die, and a blank holder located on the outer periphery of the male die. In the press processing method of manufacturing a press-processed product by forming a predetermined shape with respect to a thin blank by causing the molding portion provided in the male die to enter the molding portion provided in the female die, A molding process step in which the blank is interposed between the molding part of the mold and the molding part of the male mold, and the molding part of the male mold is inserted into the molding part of the female mold and molding is performed on the central part of the blank. And the uneven | corrugated | grooved part which produces a distortion in the peripheral part of the said blank between the center part of the said blank, and the peripheral part of the said blank while shape | molding an uneven | corrugated | grooved part in the peripheral part of the said blank while fixing the peripheral part of the said blank Molding It lies in the arrangement to include and Engineering process. Here, the female mold part and the male mold part can, for example, form a plurality of streaks in the central portion of the blank. Moreover, after the uneven | corrugated | grooved part shaping | molding process process, the peripheral part of the said blank can be further cut in the setting position of the peripheral part of the said blank.

  In this case, the uneven | corrugated | grooved part shaping | molding process process fixes the peripheral part of the said blank with the said die holder and the said blank holder, and the peripheral part of the said blank with the punch provided in at least one of the said die holder and the said blank holder The concavo-convex part may be formed on the peripheral part of the blank to cause distortion.

  In these cases, it can be configured such that the molding process and the concavo-convex part molding process are completed simultaneously.

  Moreover, in these cases, the uneven part formed in the uneven part forming process can be formed on at least a part of the entire periphery of the peripheral part of the blank, and in these cases, Specifically, the cross-sectional shape of the uneven portion formed in the uneven portion forming process can be an arc shape or a square shape.

  Furthermore, when forming the uneven portion in the uneven portion forming step, the surface of the female mold and the male mold provided with the forming portion is a general surface other than the female mold forming portion and the male mold. There is a gap larger than the plate thickness in the peripheral portion of the blank between the general surface other than the portion, and the surface of the die holder and the blank holder facing the peripheral portion of the blank is more than the molding position of the uneven portion. A gap larger than the plate thickness at the peripheral portion of the blank can be provided between the two surfaces on the female mold and the male mold side.

  According to these, the peripheral part of the blank is fixed and the blank is fixed in response to a situation in which distortion is generated by forming a predetermined shape in the central part of the blank by the female molding part and the male molding part. By forming the concavo-convex portion in the peripheral portion of the blank, strain (strain) can be generated in the peripheral portion of the blank. In this case, the concavo-convex portion can be formed at an arbitrary position in the peripheral portion of the blank. That is, when a predetermined shape is formed in the central portion of the blank, a sparse distortion occurs in the peripheral portion of the blank, and this distortion causes distortion of the press-processed product. For this reason, the distortion which arose in the press work product can be removed appropriately and reliably by forming the concavo-convex part in the peripheral part of the blank so that the distortion in the peripheral part of the blank has a substantially uniform distribution. Here, when forming the concavo-convex part, the peripheral part of the blank and a part of the peripheral part of the blank are not fixed (restrained) by the female mold and the male mold, and the die holder and the blank holder, and have good material fluidity. Therefore, it is possible to surely generate distortion in the peripheral portion of the blank along with the formation of the concavo-convex portion, and it is possible to remove the distortion of the pressed product.

  Another feature of the present invention is that the molding step is performed between the molded part of the female mold and the molded part of the male mold without fixing the peripheral portion of the blank by the die holder and the blank holder. In the state where the blank is interposed, and the material flow from the peripheral portion of the blank is allowed to flow toward the central portion of the blank, the male molded portion is allowed to enter the female molded portion, and the center of the blank There is also a configuration in which a part is molded.

  In this case, specifically, in the molding step, the blank is interposed between the molded part of the female mold and the molded part of the male mold without fixing the peripheral part of the blank by the die holder and the blank holder. The male molded part is entered into the female molded part in a state allowing material flow from the peripheral part of the blank toward the central part of the blank, and the central part of the blank is moved to the central part of the blank. A predetermined shape can be formed. That is, in this case, without fixing the peripheral portion of the blank by the die holder and the blank holder, the material flow from the peripheral portion of the blank to the central portion of the blank is allowed to be finally performed on the central portion of the blank. It can be molded to a predetermined shape.

  Alternatively, in the molding step, the blank is interposed between the female molded part and the male molded part without fixing the peripheral part of the blank by the die holder and the blank holder, A central portion of the blank is formed by causing the male molded portion to enter the female molded portion with a first molding load while allowing material flow from the peripheral portion of the blank toward the central portion of the blank. An intermediate forming step for forming an intermediate shape up to the predetermined shape, and a peripheral edge portion of the blank by fixing the peripheral edge portion of the blank toward the central portion of the blank by the die holder and the blank holder. In a state in which the material flow from the portion is prohibited, the male molded part is transferred to the female molded part by a second molding load larger than the first molding load. By entering, can be constructed from the intermediate shape to the central portion of the blank such that the final forming step of final forming process toward the predetermined shape. That is, in this case, the intermediate shape is formed in the central portion of the blank while allowing the material flow from the peripheral portion of the blank toward the central portion of the blank without fixing the peripheral portion of the blank by the die holder and the blank holder. After molding, the peripheral part of the blank is fixed by the die holder and the blank holder, and the predetermined shape is finally formed in the central part of the blank in a state where the material flow from the peripheral part of the blank is prohibited toward the central part of the blank. Can be molded.

  In this case, the final molding process can be completed at the same time as the concavo-convex part molding process.

  According to these, when the male molded part is entered into the female molded part and a predetermined shape is formed in the central part of the blank, at least material flow from the peripheral part of the blank toward the central part of the blank is ensured. can do. Thereby, with the molding part of the male mold entering the molding part of the female mold, in particular, since the material can be allowed to flow in the molding part close to the peripheral part of the blank, at least in this molding part, A predetermined shape is formed by so-called drawing. Therefore, even when a predetermined shape is formed in the central portion of the blank, it is possible to satisfactorily suppress the occurrence of distortion itself in the pressed product. In this case, it is difficult for the material to flow into a molding site away from the peripheral portion of the blank, and an intermediate shape is molded by a so-called overhanging process at this molding site. However, since the material can be satisfactorily flowed into the molding site close to the peripheral portion of the blank, so-called material is inevitably generated between the molding site and the peripheral portion of the blank as the molding progresses. Therefore, excessive strain can be suppressed even in the overhanging process. As a result, the occurrence of distortion itself is suppressed, in other words, the distortion of the press-processed product is more reliably performed through the above-described uneven portion forming process step in a state in which the unevenness of the distortion (distortion) generated in the peripheral portion of the blank is reduced. Can be removed.

  Here, the molding step includes fixing the peripheral edge of the blank by the die holder and the blank holder, and interposing the blank between the female molded part and the male molded part, In the state where the material flow from the peripheral portion of the blank is prohibited toward the central portion of the blank, the male molded portion is entered into the female molded portion, and the predetermined shape is formed in the central portion of the blank. It can also be configured to work. In this case, since a predetermined shape is formed in the central portion of the blank in a state where the material flow from the peripheral portion of the blank toward the central portion of the blank is prohibited, distortion in the pressed product is likely to occur. However, the distortion of the press-processed product can be appropriately removed by going through the above-described uneven portion forming process.

  In addition, another feature of the present invention is that the concave and convex portion molding process is performed, and the female die and the male die are inserted into the blank in a state where the male molded portion enters the female molded portion. It is also possible to displace relative to the die holder and the blank holder fixed to the peripheral part of the blank so as to cause distortion in the peripheral part of the blank.

  In this case, when the female mold and the male mold are displaced relative to the die holder and the blank holder, the surface of the female mold and the male mold other than the female mold molded section is provided. A surface that is larger than the plate thickness in the peripheral portion of the blank, and faces the peripheral portion of the blank of the die holder and the blank holder. The gap between the two surfaces on the female mold and the male mold side relative to the molding position can be larger than the plate thickness at the peripheral edge of the blank.

  In these cases, the concavo-convex portion forming step displaces the female mold and the male mold relative to the die holder and the blank holder between the peripheral portion of the blank and the peripheral portion of the blank. A step portion can be formed by the accompanying plastic deformation, and distortion can be generated in the peripheral portion of the blank.

  According to these, in addition to causing the peripheral portion of the blank to be distorted by forming the concavo-convex portion in the peripheral portion of the blank as described above, the female mold and the male mold are relatively positioned with respect to the die holder and the blank holder. Strain can be generated in the peripheral portion of the blank also by plastic deformation accompanying the displacement (specifically by forming a stepped portion). Therefore, distortion generated in the press-processed product can be removed more reliably. When the female mold and the male mold are displaced relative to the die holder and the blank holder, the peripheral part of the blank and a part of the peripheral edge of the blank are fixed by the female mold and the male mold, and the die holder and the blank holder ( Since it has good material fluidity without being constrained, distortion can be reliably generated in the peripheral portion of the blank with plastic deformation, and distortion of the pressed product can be removed.

1 is a schematic view schematically showing a configuration of a press device used in a press working method according to an embodiment of the present invention. It is a schematic diagram showing a metal separator manufactured through a pressing method according to an embodiment of the present invention. It is a figure for demonstrating a blank setting process. It is a figure for demonstrating the fall of the blank holder in a shaping | molding process. It is a figure for demonstrating the fall of the punch in a shaping | molding process. It is a figure for demonstrating shaping | molding of the intermediate shape in a shaping | molding process. It is a figure for demonstrating an uneven | corrugated | grooved part shaping | molding process. It is a figure for demonstrating the uneven | corrugated | grooved part shape | molded by the uneven | corrugated | grooved part shaping | molding process process of FIG. It is a figure for demonstrating operation | movement of the punch and blank holder at the time of taking out of a press work product. It is the schematic which shows the press work goods shape | molded through the press work method of this invention. It is a figure for demonstrating the trimming (cut of a peripheral part) with respect to a press work product. It is the schematic which shows the structure of the press apparatus used for the 3rd modification of embodiment of this invention, and is used for the press work method. It is a figure for demonstrating the uneven | corrugated | grooved part shaping | molding process based on the 3rd modification of embodiment of this invention. FIG. 10 is a schematic diagram schematically illustrating a configuration of a press device used in a press working method according to a fourth modification of the embodiment of the present invention. It is a figure for demonstrating the uneven | corrugated | grooved part shaping | molding process based on the 4th modification of embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a press device 10 according to the present embodiment, which forms a plurality of streaky irregularities on a thin metal plate Z as a thin blank. The press device 10 includes a die 11 as a female die, a punch 12 as a male die, a die holder 13, a blank holder 14, and a distortion correcting punch 15.

  As shown in FIG. 1, the die 11 is installed on the bolster BR via a pair of end blocks EB at the lower end surface. In the present embodiment, the end block EB is provided between the lower end surface and the upper surface of the bolster BR in the die 11. In this case, needless to say, the end block EB can be omitted as necessary. Further, on the upper end surface of the die 11, a forming portion 11 a for forming a plurality of streaky irregularities on the thin metal plate Z is provided in the housing recessed portion 11 b.

  As shown in FIG. 1, the punch 12 is integrally assembled with a slide SL that moves up and down in the vertical direction on the upper end side. Thereby, the punch 12 can move upward and downward integrally with the slide SL in the vertical direction. Further, on the lower end surface of the punch 12, a molding part 12a for forming a plurality of streaky irregularities on the thin metal plate Z is provided so as to be able to enter the molding part 11a formed on the die 11 and the accommodating recess 11b. Yes. As a result, the punch 12 (more specifically, the molding portion 12a) descends and enters the molding portion 11a provided in the accommodation recess 11b of the die 11 by the slide SL, and the molding portion 11a and the accommodation portion are accommodated. It is spaced apart from the recess 11b.

  As shown in FIG. 1, the die holder 13 is located on the outer periphery of the die 11 and is installed on the bolster BR at the lower end surface thereof. As will be described later, the upper surface of the die holder 13 is subjected to anti-slip processing (for example, knurling) in order to firmly hold and fix the placed thin metal plate Z together with the blank holder 14. There is a case. Further, as shown in FIG. 1, the die holder 13 is formed with a through-hole 13 a for inserting the distortion correcting punch 15.

  As shown in FIG. 1, the blank holder 14 is located on the outer periphery of the punch 12, and is integrally assembled to the slide SL via a gas spring GS at the upper end thereof. Thereby, the blank holder 14 can move upward and downward integrally with the slide SL in the vertical direction, and when sandwiching the thin metal plate Z together with the die holder, at least a low load and a high load are provided by the gas spring GS. The thin metal plate Z is clamped by the two-stage load. The lower end surface of the blank holder 14 may be subjected to anti-slip processing (for example, knurl processing) in order to firmly sandwich and fix the thin metal plate Z placed on the die holder 13. Further, a recess 14 a for accommodating the distortion correcting punch 15 is formed on the lower end surface of the blank holder 14.

  As will be described later, the distortion correcting punch 15 forms an uneven portion on the peripheral portion of the thin metal plate Z, and is accommodated in a through hole 13a formed in the die holder 13 as shown in FIG. . The strain correction punch 15 is moved upward and downward from the recess 14a by the hydraulic cylinder YS1 provided at the lower portion in the vertical direction toward the recess 14a formed in the blank holder 14. . Here, the cross-sectional shape on the tip side of the distortion correcting punch 15 is, for example, an arc shape or a square shape, and the cross-sectional shape of the uneven portion to be formed is also an arc shape or a square shape.

  Next, by using the press device 10 configured as described above, a plurality of molding portions 12 a provided in the punch 12 are caused to enter the molding portions 11 a provided in the housing recesses 11 b of the die 11, and a plurality of the thin metal plates Z are provided. A press process for manufacturing a press-processed product by forming and processing the streaky irregularities will be described. In the present embodiment, as a product obtained from a press-processed product through a finishing process (cutting process), as shown in FIG. An example of manufacturing a separator will be described.

  The press apparatus 10 forms and manufactures the press-worked product W shown in FIG. 10 through the blank setting step shown in FIG. 3, the forming step shown in FIGS. 4 to 6, and the uneven portion forming step shown in FIG. To do.

  In the blank setting step shown in FIG. 3, the front end surface (upper end surface) of the distortion correcting punch 15 is aligned with the upper end surface of the die 11 (more specifically, the upper end surface of the housing recess 11b) by the hydraulic cylinder YS1. And the thin metal plate Z which is a thin blank is mounted and set. Here, as for the thin metal plate Z, a sheet material cut into a preset size as shown in FIG. 3 can be supplied one by one, or it can be uncoiled from the coil and continuously supplied. Thus, when the blank setting process is completed, the process proceeds to the molding process.

  4 to 6, as shown in FIG. 4, the punch 12 and the blank holder 14 are lowered by the slide SL moving downward. First, the lower end surface of the blank holder 14 is a thin metal plate Z. To touch. Subsequently, as shown in FIG. 5, the forming portion 12 a of the punch 12 contacts the thin metal plate Z. In this case, the blank holder 14 that is lowered by the adjustment of the gas spring GS has a low load together with the die holder 13, and more specifically, the material is formed along with the formation of a plurality of streaky uneven shapes (predetermined shapes) as described later. The thin metal plate Z is held by a load that is drawn into the inside (that is, the material is allowed to flow).

  Further, as shown in FIG. 6, the slide SL moves downward, and the molding portion 12 a of the punch 12 enters the molding portion 11 a and the housing recess 11 b of the die 11 together with the central portion Z1 of the thin metal plate Z. In this case, the die holder 13 and the blank holder 14 hold the peripheral portion Z2 of the thin metal plate Z with a low load. For this reason, as the forming part 12a of the punch 12 enters the forming part 11a of the die 11, the material flows from the peripheral portion Z2 of the thin metal plate Z toward the central portion Z1, more specifically, the thin metal The peripheral portion Z2 of the plate Z flows so as to be drawn toward the central portion Z1. As a result, at least a thin-walled portion of the molding portion that is sandwiched between the molding portion 12a of the punch 12 and the molding portion 11a of the die 11 to form a streak-like uneven shape that is the final product shape (predetermined shape). In a molding portion near the peripheral edge portion Z2 of the metal plate Z, a streak-like uneven shape is formed by so-called drawing processing due to good material flow. On the other hand, among the forming parts where the streak-like uneven shape is formed, a good material flow cannot be obtained at the forming part away from the peripheral edge portion Z2 of the thin metal plate Z. An uneven shape is formed. As described above, when the streak-like uneven shape is formed, the process proceeds to the uneven portion forming process.

  Here, the peripheral part Z2 is held by the die holder 13 and the blank holder 14 with a low load, so that a good material flow (more specifically, the inflow of the material) occurs in the molding part close to the peripheral part Z2. For this reason, a non-uniform state of material flow that is inevitably generated as the formation of the concavo-convex shape progresses between the molding part close to the peripheral part Z2 and the molding part away from the peripheral part Z2, so-called The material balance is reduced. Thereby, although it becomes an overhang | projection process in the shaping | molding site | part distant from the peripheral part Z2, required streaky uneven | corrugated shape can be shape | molded, without producing a distortion too much.

  In the concavo-convex portion forming process shown in FIG. 7, by adjusting the gas spring GS, the blank holder 14 and the die holder 13 have a high load, specifically, the material is not drawn into the interior along with the forming (that is, the material The thin metal plate Z is sandwiched by a load that fixes the peripheral portion Z2 of the thin metal plate Z so that the flow is prohibited. The hydraulic cylinder YS1 moves the distortion correcting punch 15 upward in accordance with the fixing of the peripheral edge portion Z2 by the die holder 13 and the blank holder 14, and the front end portion of the distortion correcting punch 15 is moved to the blank holder 14 together with the peripheral edge portion Z2. It is made to enter into the formed recess 14a. As a result, the peripheral portion Z2 of the thin metal plate Z has an arc shape or a square cross-sectional shape as shown in FIG. 8, and extends over the entire periphery of the peripheral portion Z2 or in accordance with the distortion occurrence site. Thus, a convex portion (or concave portion) Z4 is formed at an arbitrary position. The convex portion (concave portion) Z4 may be formed in a streak shape as shown in FIG. 8, or may be formed in a circle or an ellipse.

  Here, when the convex portion (concave portion) Z4 is formed by the distortion correcting punch 15, the general surface other than the forming portion 11a of the die 11 and the punch 12 are formed as shown as A portion and B portion in FIG. The size of the gap between the general surface other than the forming portion 12a is set to be larger than the plate thickness of the peripheral portion Z3 between the central portion Z1 and the peripheral portion Z2 of the thin metal plate Z. In addition, as shown as part C in FIG. 7, the inner side of the through-hole 13 a of the die holder 13, that is, the surface closer to the die 11 than the molding position of the convex portion (concave portion) Z 4 and the inner side of the concave portion 14 a of the blank holder 14. That is, the size of the gap between the forming position of the convex portion (concave portion) Z4 and the surface closer to the punch 12 is set to be larger than the thickness of the peripheral portion Z2 of the thin metal plate Z. On the other hand, as shown as part D in FIG. 7, the size of the gap between the surface outside the through hole 13a of the die holder 13 and the surface outside the recess 14a of the blank holder 14 is a thin metal plate. It is set to have a size capable of fixing the peripheral portion Z2 of Z.

  As a result, when the convex portion (concave portion) Z4 is formed by the distortion correcting punch 15, the peripheral portion Z2 of the thin metal plate Z is sandwiched between the die holder 13 and the blank holder 14 at the portion D shown in FIG. The material fluidity of a part of the peripheral part Z3 and the peripheral part Z2 is secured in the A part, the B part, and the C part shown in FIG. Therefore, when the distortion correcting punch 15 forms the convex portion (concave portion) Z4 in the peripheral portion Z2, the peripheral portion Z2 is smoothly pulled toward the peripheral portion Z2, and the peripheral portion Z3 can be appropriately distorted. As a result, the distortion in the press-processed product W is removed satisfactorily.

  Thus, when the uneven | corrugated | grooved part shaping | molding process process is completed, as shown in FIG. 9, with the slide SL moving up, the punch 12 and the blank holder 14 are evacuated upwards, and the press work product W is taken out. Then, as shown in FIG. 11, the pressed product W thus pressed is trimmed at the set position of the peripheral portion Z3 of the thin metal plate Z, and the peripheral portion Z2 and the convex portion (recessed portion) of the thin metal plate Z. ) Z4 is cut. Thereby, as shown in FIG. 2, the metal separator by which many stripe-shaped uneven | corrugated shape was shape | molded is manufactured.

  As can be understood from the above description, according to the above embodiment, the forming portion 12a of the punch 12 enters the forming portion 11a of the die 11, and a plurality of streaky uneven shapes are formed in the central portion Z1 of the thin metal plate Z. Can be secured at least from the peripheral portion Z2 of the thin metal plate Z toward the central portion Z1 of the thin metal plate Z. Thereby, since the molding part 12a of the punch 12 enters the molding part 11a of the die 11, the material can flow in particularly in the molding part close to the peripheral portion Z2, so at least in this molding part. A so-called concavo-convex shape is formed by so-called drawing. Therefore, even when a plurality of streaky irregularities are formed in the central portion Z1, for example, distortion unevenness generated in the surrounding portion Z3 can be reduced as compared with the case where no material is allowed to flow. It is possible to satisfactorily suppress the occurrence of distortion in the processed product W, that is, the metal separator as a product.

  Further, by forming the convex portion (recessed portion) Z4 on the peripheral edge portion Z2 of the thin metal plate Z by the strain correction punch 15, the peripheral portion Z3 of the thin metal plate Z can be distorted. In this case, the convex portion (concave portion) Z4 can be formed at an arbitrary position in the peripheral edge portion Z2. That is, when a plurality of streaky uneven shapes are formed in the central portion Z1 of the thin metal plate Z, the peripheral portion Z3 is sparsely distorted, and this distortion causes the press-work product W to be distorted. For this reason, the convex portion (concave portion) Z4 is formed in the peripheral portion Z2 so that the strain in the peripheral portion Z3 has a substantially uniform distribution, in other words, by reducing the unevenness of the strain generated in the peripheral portion Z3. The distortion generated in the workpiece W can be appropriately and reliably removed. Here, when forming the convex part (concave part) Z4, a part of the peripheral part Z3 and the peripheral part Z2 is not fixed (restrained) by the die 11 and the punch 12, and the die holder 13 and the blank holder 14, and is a good material. Since it has fluidity, it is possible to reliably cause distortion in the peripheral portion Z2 with the formation of the convex portion (concave portion) Z4, and it is possible to remove the distortion of the press-work product W.

a. First Modification In the above embodiment, in the forming process, the die holder 13 and the blank holder 14 do not fix the peripheral portion Z2 of the thin metal plate Z, that is, the material from the peripheral portion Z2 toward the central portion Z1. In a state in which the flow of the metal is allowed, a plurality of streak-like uneven shapes, which are final shapes (predetermined shapes), are formed by the forming portion 11a of the die 11 and the forming portion 12a of the punch 12. In this case, the forming process includes an intermediate forming process for forming the intermediate shape while allowing the material to flow, and a streaky uneven shape that is a predetermined shape from the intermediate shape in a state where the flow of the material is prohibited. It is also possible to carry out by configuring from a final forming process step of forming in an automatic manner.

  Specifically, in the intermediate forming process, the die holder 13 and the blank holder 14 hold the peripheral portion Z2 of the thin metal plate Z with a low load, that is, the peripheral portion Z2 of the thin metal plate Z faces the central portion Z1. It can flow to be drawn. In this intermediate forming process, the forming portion 12a of the punch 12 enters the forming portion 11a and the housing recess 11b of the die 11 together with the central portion Z1 of the thin metal plate Z by the first forming load F0. A central portion Z1 of the metal plate Z is formed. The magnitude of the first molding load F0 is set to about half (F1 / 2) of the magnitude of the second molding load F1 in the final molding process described later. For this reason, the streaky irregularities formed by being sandwiched between the molding part 12a of the punch 12 and the molding part 11a of the die 11 still accurately determine the shape of the molding parts 11a and 12a, that is, the final product shape (predetermined shape). It is not the shape transferred to, but an intermediate shape up to the product shape. Thus, if an intermediate shape is shape | molded in the center part of the thin metal plate Z in an intermediate shaping | molding process, it will progress to a final shaping | molding process.

  In the final forming process, the die holder 13 and the blank holder 14 sandwich and fix the peripheral portion Z2 of the thin metal plate Z with a high load, that is, the peripheral portion Z2 of the thin metal plate Z is drawn toward the central portion Z1. Flow is prohibited. In this final forming step, the forming portion 12a of the punch 12 is further formed with the forming portion of the die 11 together with the central portion Z1 of the thin metal plate Z by the second forming load F1 larger than the first forming load F0. 11a and the accommodation recessed part 11b are entered. Thereby, in the center part Z1 of the thin metal plate Z, the shape of the molding part 12a of the punch 12 and the molding part 11a of the die 11, that is, the final product shape (predetermined shape) is accurately transferred and molded.

  Here, as described above, in the final forming step, the die holder 13 and the blank holder 14 sandwich and fix the peripheral portion Z2 of the thin metal plate Z with a high load. Therefore, when the final molding process is performed, the final molding process and the uneven portion molding process can be completed at the same time. Thus, also in this 1st modification, the effect similar to the said embodiment is acquired.

b. Second Modification In the above embodiment, in the forming step, the die holder 13 and the blank holder 14 do not fix the peripheral portion Z2 of the thin metal plate Z, that is, the material is moved from the peripheral portion Z2 toward the central portion Z1. In a state where the flow was allowed, a plurality of streak-like uneven shapes as a final shape (predetermined shape) were formed by the forming portion 11a of the die 11 and the forming portion 12a of the punch 12. In this case, in the forming process, the die holder 13 and the blank holder 14 sandwich and fix the peripheral portion Z2 of the thin metal plate Z, that is, the flow of the material from the peripheral portion Z2 toward the central portion Z1 is prohibited. In this state, a plurality of streaky uneven shapes, which are final shapes (predetermined shapes), can be formed by the forming portion 11a of the die 11 and the forming portion 12a of the punch 12.

  In this case, since the flow of the material is prohibited, the forming portion 11a of the die 11 and the forming portion 12a of the punch 12 form a streak-like uneven shape in the central portion Z1 of the thin metal plate Z by so-called overhang forming. . Accordingly, the strain distribution in the peripheral portion Z3 of the thin metal plate Z is likely to be non-uniform, and the product manufactured from the press-worked product W is likely to be distorted. However, in the concavo-convex portion forming process, in consideration of the strain distribution in the peripheral portion Z3 of the thin metal plate Z, the convex portion (concave portion) Z4 is formed on the peripheral portion Z2 of the thin metal plate Z so that the strain distribution becomes uniform. It can be selectively molded. As a result, even when a molding process in which the flow of the material is prohibited is adopted, the strain distribution in the press-processed product W can be made uniform by passing through the concavo-convex part molding process. Generation of distortion can be appropriately suppressed.

c. Third Modification In the embodiment and each of the modifications described above, in the concavo-convex part forming step, a convex part (concave part) Z4 is formed on the peripheral part Z2 of the thin metal plate Z, and the distortion in the peripheral part Z3 of the thin metal plate Z The distribution was made uniform so as to remove the distortion of the pressed product W, that is, the metal separator. In this case, the peripheral portion Z2 and the peripheral portion Z3 can be positively plastically deformed so that the strain distribution in the peripheral portion Z3 of the thin metal plate Z is more uniform. Hereinafter, this third modification will be specifically described.

  In this 3rd modification, after forming the convex part (recessed part) Z4 in the peripheral part Z2 of the thin metal plate Z as mentioned above in the uneven | corrugated | grooved part shaping | molding process process, the die | dye 11, the punch 12, the die holder 13, and the blank holder 14 are displaced relative to each other, and the peripheral portion Z2 and the peripheral portion Z3 are positively plastically deformed. Specifically, the stepped portion Z5 is formed at the boundary portion between the peripheral portion Z2 and the peripheral portion Z3. Therefore, in the third modification, as shown in FIG. 12, the die holder 13 is installed on the bolster BR via the hydraulic cylinder YS2. Thereby, the die holder 13 can move up and down in the vertical direction by the hydraulic cylinder YS2. In this case, instead of moving the die holder 13 up and down in the vertical direction, the die 11 can be moved up and down in the vertical direction. In this case, the die 11 is installed on the bolster BR via the hydraulic cylinder.

  And in this 3rd modification, after forming the convex part (concave part) Z4 in the peripheral part Z2 of the thin metal plate Z by operating the distortion correction punch 15 in an uneven | corrugated part shaping | molding process, as shown in FIG. Then, the die holder 13 and the blank holder 14 are moved upward in the vertical direction relative to the die 11 and the punch 12. At this time, since the die holder 13 and the blank holder 14 fix the peripheral portion Z2 of the thin metal plate Z, and the die 11 and the punch 12 sandwich the central portion Z1 of the thin metal plate Z, the die holder 13 and the blank holder When 14 integrally moves upward, so-called step drawing is started.

  By starting the step drawing as described above, as shown in FIG. 13, a stepped portion Z5 is formed between the peripheral portion Z3 and the peripheral portion Z2 of the thin metal plate Z by plastic deformation. Here, when step drawing is performed, as shown as A part, B part, and C part in FIG. 13, general surfaces other than the molding part 11 a of the die 11 and general parts other than the molding part 12 a of the punch 12 are used. The size of the gap with the surface is set to be larger than the plate thickness of the peripheral portion Z3 between the central portion Z1 and the peripheral portion Z2 of the thin metal plate Z, and is larger than the through hole 13a of the die holder 13. Inner side, that is, the surface closer to the die 11 than the molding position of the convex portion (concave portion) Z4 and the inner side of the concave portion 14a of the blank holder 14, that is, the surface closer to the punch 12 side than the molding position of the convex portion (concave portion) Z4. The size of the gap is set to be larger than the plate thickness of the peripheral portion Z2 of the thin metal plate Z. Accordingly, the material fluidity of a part of the peripheral portion Z3 and the peripheral portion Z2 in the step drawing process is ensured. In the third embodiment, the peripheral edge portion Z2 is fixed by the die holder 13 and the blank holder 14 at a portion indicated as a D portion in FIG.

  Thereby, in this 3rd modification, through the uneven | corrugated | grooved part shaping | molding process process, the distortion distribution in the press-work product W can be made more uniform, and generation | occurrence | production of the distortion in a product can be suppressed appropriately. it can. Therefore, the same effect as the above embodiment can be obtained.

d. Fourth Modification In the above-described embodiment and each of the above-described embodiments, after forming a plurality of streaky uneven shapes in the central portion of the thin metal plate Z in the forming process, the strain correction punch 15 is operated in the uneven part forming process. It was made to carry out so that the convex part (concave part) Z4 might be formed in the peripheral part Z2 of the thin metal plate Z. In this case, instead of or in addition to providing the distortion correcting punch 15, as shown in FIG. 14, the protrusion 12 and the protrusion accommodating portion 17 are provided on the punch 12 and the die 11. It is also possible to do. Here, the projections 16 for forming the concavo-convex portions and the projection accommodating portions 17 can be provided at positions corresponding to the strain distribution in the peripheral portion Z3 of the thin metal plate Z, that is, the strain occurrence sites in the pressed product W. Further, the shape of the projections 16 for forming the concavo-convex portions can be an arc shape or a square shape depending on the magnitude of the strain to be generated.

  By providing the protrusions 16 for forming the uneven portions and the protrusion accommodating portions 17 in this way, as shown in FIG. 15, at the same time as forming a plurality of streaky uneven shapes in the central portion of the thin metal plate Z in the forming step, A convex portion (concave portion) Z4 is formed on the peripheral edge portion Z2 of the thin metal plate Z. That is, by providing the projections 16 for forming the concavo-convex portions and the projection accommodating portions 17, the molding process and the concavo-convex portion forming process can be completed simultaneously. As a result, the same effects as in the above embodiment can be obtained, and the production tact can be accelerated. Even in the case where the projections 16 for forming the concavo-convex portions and the projection accommodating portions 17 are provided as described above, the plasticity is provided between the peripheral portion Z3 and the peripheral portion Z2 of the thin metal plate Z as in the case of the third modified example. Needless to say, the present invention can be implemented so as to form a stepped portion due to deformation.

  In carrying out the present invention, the present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the object of the present invention.

  For example, in the above embodiment and the first to third modifications, a through hole 13a is formed in the die holder 13, and the strain correcting punch 15 and the hydraulic cylinder YS1 are provided on the die holder 13 side so that the through hole 13a is inserted. Carried out. In this case, it goes without saying that a through hole is formed in the blank holder 14, and the strain correction punch 15 and the hydraulic cylinder YS1 are provided on the blank holder 14 side. Even in this case, the same effect as the above embodiment can be obtained.

  Moreover, in the said embodiment and each said modification, the die | dye 11, the punch 12, the die holder 13, the blank holder 14, and the distortion correction punch 15 of the press apparatus 10 were arrange | positioned up and down in the perpendicular direction, and it implemented. In this case, the die 11, the punch 12, the die holder 13, the blank holder 14, and the distortion correcting punch 15 of the press device 10 can be arranged on the left and right in a direction other than the vertical direction, for example, the horizontal direction. . Even when the press device 10 is arranged in this manner, the same effects as those of the above-described embodiment can be obtained.

  Moreover, in the said embodiment and each modification, it implemented so that the punch 12 and the blank holder 14 might move upwards or downwards with the slide SL. Further, the distortion correcting punch 15 is moved upward or downward by the hydraulic cylinder YS1 and the die holder 13 by the hydraulic cylinder YS2. In this case, it goes without saying that the present invention can be implemented by employing another drive device, for example, an electrically driven electric motor, instead of the slide SL, the hydraulic cylinder YS1, and the hydraulic cylinder YS2. Even in this case, the same effect as the above embodiment can be obtained.

  Furthermore, in the said embodiment and each modification, it implemented so that a several streaky uneven | corrugated shape might be shape | molded in the center part Z1 of the thin metal plate Z. FIG. In this case, it goes without saying that, for example, a dot-like (dimple-like) uneven shape can be formed instead of forming a plurality of streaky uneven shapes. Even in this case, the same effect as the above embodiment can be obtained.

  DESCRIPTION OF SYMBOLS 10 ... Press apparatus, 11 ... Die (female type), 11a ... Molding part, 11b ... Housing recessed part, 12 ... Punch (male type), 12a ... Molding part, 13 ... Die holder, 14 ... Blank holder, 15 ... Strain correction punch (Punch), Z ... Thin metal plate (blank), Z1 ... Central part, Z2 ... Peripheral part, Z3 ... Peripheral part, Z4 ... Convex part (uneven part), Z5 ... Step part, YS1 ... Hydraulic cylinder, YS2 ... Hydraulic pressure Cylinder, W ... pressed product

Claims (16)

Using a pressing device having a female mold, a male mold, a die holder positioned on the outer periphery of the female mold, and a blank holder positioned on the outer periphery of the male mold, a molding portion provided on the male mold is used as the female mold. In a pressing method for manufacturing a pressed product by forming a predetermined shape with respect to a thin blank by entering the forming part provided in
Molding in which the blank is interposed between the molded part of the female mold and the molded part of the male mold, and the molded part of the male mold enters the molded part of the female mold and is molded into the central part of the blank. Processing steps,
An uneven portion forming process for fixing the peripheral portion of the blank and forming an uneven portion on the peripheral portion of the blank to cause distortion in the peripheral portion of the blank between the central portion of the blank and the peripheral portion of the blank. A press working method configured to include a process. In the press processing method of Claim 1,
The uneven part forming process includes:
The peripheral portion of the blank is fixed by the die holder and the blank holder, and the uneven portion is formed on the peripheral portion of the blank by a punch provided on at least one of the die holder and the blank holder. A press working method configured to cause distortion in a surrounding portion. In the press working method according to claim 1 or 2,
The press working method comprised so that the said shaping | molding process and the said uneven | corrugated | grooved part shaping | molding process could be completed simultaneously. In the pressing method according to any one of claims 1 to 3,
The uneven part formed in the uneven part forming process is:
A press working method in which the blank is formed on at least a part of the entire periphery of the peripheral portion. In the pressing method according to any one of claims 1 to 4,
The cross-sectional shape of the uneven part formed in the uneven part forming process is as follows:
A press working method having an arc shape or a square shape. In the pressing method according to any one of claims 1 to 5,
When forming the uneven portion in the uneven portion forming process,
On the surface of the female mold and the male mold provided with the molding portion, the gap between the general surface other than the female mold molding portion and the general surface other than the male molding portion is determined by the thickness of the peripheral portion of the blank. Has a large gap, and the surface of the die holder and the blank holder facing the peripheral portion of the blank is between the two surfaces that are the female mold and the male mold side of the concave and convex portions. A press working method having a gap larger than the plate thickness at the peripheral portion. In the press working method according to any one of claims 1 to 6,
The molding process includes
The blank is interposed between the molded part of the female mold and the molded part of the male mold without fixing the peripheral part of the blank by the die holder and the blank holder, and toward the central part of the blank. A press working method configured to allow the male molded part to enter the female molded part in a state in which material flow from the peripheral part of the blank is allowed to be molded into the central part of the blank. In the press processing method of Claim 7,
The molding process includes
The blank is interposed between the molded part of the female mold and the molded part of the male mold without fixing the peripheral part of the blank by the die holder and the blank holder, and toward the central part of the blank. A press configured to form the predetermined shape in the central portion of the blank by allowing the male molded portion to enter the female molded portion while allowing material flow from the peripheral portion of the blank. Processing method. In the press processing method of Claim 7,
The molding process includes
The blank is interposed between the molded part of the female mold and the molded part of the male mold without fixing the peripheral part of the blank by the die holder and the blank holder, and toward the central part of the blank. Until the material flow from the peripheral part of the blank is allowed, the male molded part is caused to enter the female molded part by a first molding load until the predetermined shape is reached in the central part of the blank. An intermediate molding process for molding the intermediate shape of
In the state where the peripheral portion of the blank is fixed by the die holder and the blank holder and the material flow from the peripheral portion of the blank is prohibited toward the central portion of the blank, the male mold is moved to the female mold. A final molding process step of causing the molding part to enter the blank portion by a second molding load larger than the first molding load and finally molding the central portion from the intermediate shape toward the predetermined shape. The press working method comprised so that it might consist of. The press working method according to claim 9,
The final molding process is
A press working method configured to be completed at the same time as the uneven part forming process. In the press working method according to any one of claims 1 to 6,
The molding process includes
The blank holder is fixed by the die holder and the blank holder, the blank is interposed between the molded part of the female mold and the molded part of the male mold, and the blank is directed toward the central part of the blank. In a state where the material flow from the peripheral part of the blank is prohibited, the male mold part is advanced into the female mold part and the predetermined shape is molded into the central part of the blank. Method. In the pressing method according to any one of claims 1 to 11,
The uneven part forming process further includes:
The male mold and the male mold are fixed relative to the die holder and the blank holder that fix the peripheral portion of the blank in a state where the male molded section enters the female mold molded section. A press working method configured to cause displacement in the peripheral portion of the blank. The press working method according to claim 12,
When the female mold and the male mold are displaced relative to the die holder and the blank holder,
On the surface of the female mold and the male mold provided with the molding portion, the gap between the general surface other than the female mold molding portion and the general surface other than the male molding portion is determined by the thickness of the peripheral portion of the blank. Has a large gap, and the surface of the die holder and the blank holder facing the peripheral portion of the blank is between the two surfaces that are the female mold and the male mold side of the concave and convex portions. A press working method having a gap larger than the plate thickness at the peripheral portion. The press working method according to claim 12 or 13,
The uneven part forming process includes:
Between the peripheral portion of the blank and the peripheral portion of the blank, a step is formed by plastic deformation accompanying the displacement of the female mold and the male mold relative to the die holder and the blank holder, A press working method for generating distortion in a peripheral portion of the blank. The press working method according to any one of claims 1 to 14,
The female mold part and the male mold part are press working methods in which a plurality of streaks are formed in the central portion of the blank. The press working method according to any one of claims 1 to 15,
A press working method of further cutting a peripheral edge portion of the blank at a set position of the peripheral portion of the blank after the uneven portion forming step.

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